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    • 专利摘要:
    The invention relates to a closed rotary electrical machine incorporating a cooling system comprising two internal fans (181, 182) fixedly mounted on the shaft (160) at both ends of the rotor (150). Rotor and stator (190) are contained in a carcass sealed by two flanges. The fans allow double air circulation in flow barriers surrounding the rotor magnets and formed by axial recesses passing through the rotor from one side, and also air circulation in the space created between the internal fans and the internal faces of the flanges having fins (113, 123) adapted to guide the air flows created by the fans and capture their heat. External cooling means make it possible to cool the carcass and the flanges, which can be by air or by liquid.
    公开号:FR3062253A1
    申请号:FR1750583
    申请日:2017-01-25
    公开日:2018-07-27
    发明作者:Wissam DIB；Luca FAVRE；Davide BETTONI
    申请人:IFP Energies Nouvelles IFPEN；Mavel SRL；
    IPC主号:
    专利说明:

    @ Holder (s): IFP ENERGIES NOUVELLES Public establishment, MAVEL S.R.L. Limited liability company.
    ® Agent (s): IFP ENERGIES NOUVELLES.
    ® CLOSED ROTATING ELECTRIC MACHINE WITH AN AIR COOLING SYSTEM OF THE MAGNETS IN THE ROTOR.
    FR 3,062,253 - A1 (57) The invention relates to a closed rotary electrical machine incorporating a cooling system comprising two internal fans (181,182) fixedly mounted on the shaft (160) at the two ends of the rotor (150). Rotor and stator (190) are contained in a carcass sealed by two flanges. The fans allow a double circulation of air in flow barriers surrounding the magnets of the rotor and formed by axial recesses passing through the rotor, and also a circulation of air in the space created between the internal fans and the internal faces of the flanges comprising fins (113, 123) capable of orienting the air flows created by the fans and capturing their heat. External cooling means make it possible to cool the carcass and the flanges, which may be by air or by liquid.

    Field of the invention
    The present invention relates to the field of rotating electrical machines, in particular the cooling of rotating electrical machines.
    It relates more particularly to the cooling of a closed rotary electrical machine with variable synchronous reluctance.
    General context
    A rotary electrical machine conventionally comprises a fixed part, the stator, and a mobile part in rotation, the rotor, arranged coaxially one inside the other. The rotor is generally housed inside the stator which carries electrical windings generating a magnetic field making it possible to drive the rotor in rotation. The rotor is typically formed of a body formed of a stack of sheets, and placed on a rotation shaft. These sheets include housings for permanent magnets or coils forming magnetic poles at the periphery of the rotor. The magnets can appear on the surface of the rotor or be completely integrated within the rotor. In the case of rotating electrical machines with variable synchronous reluctance, the rotor generally comprises permanent magnets housed near the flow barriers carried by this rotor, these flux barriers typically being empty spaces. There is also talk of a synchro-reluctant machine assisted by permanent magnets.
    Electric machines heat up due to electromagnetic (Joule effect and iron loss) and mechanical losses. This heating affects their functioning and leads to the degradation of their performance. For example, if the magnets are not cooled, the magnetic flux is less intense, which leads to a loss of torque and therefore a degradation of the performance of the electric machine. Irreversible demagnetization of the magnets can occur. The winding is also sensitive to temperature rises: the higher the temperature of the winding, the more the electrical conductivity of the copper and the lifetime of the winding are reduced. As the resistance of copper increases, there is also a loss of yield. The various electromagnetic components of a rotary electrical machine, as well as certain insulating materials used in the parts of the electrical machine, are thus sensitive to heating produced in operation, and their cooling is essential to dissipate the heat produced, in order to preserve a good machine performance, ensuring repeatability of its performance, extending its service life and limiting maintenance.
    The search for efficient cooling is therefore a major concern for manufacturers and integrators of rotating electrical machines.
    Different types of cooling exist, often adapted to the power of the machine, among which air cooling systems, generally less efficient and aggressive for the interior of the machine, liquid cooling systems, for example water , in particular used as soon as the losses are significant as in the case of electric traction motors, or by oil. Other helium or liquid nitrogen cooling systems can be used for electrical machines in power plants.
    Although the air cooling of the machine, more precisely of the carcass (or casing) of the machine containing the rotor and the stator, constitutes an economically attractive solution, compared to the other cooling systems, it generally has a lower efficiency, and is thus often confined to the cooling of low power electrical machines. This is the case, for example, in traction applications where air cooling is typically used for electric motors with a power of less than 20 kW. Beyond this, a liquid cooling system is often used.
    Furthermore, air cooling may require air circulation between the outside and the inside of the electric machine, which adds to the limitation of its field of application, reserved in this case for “open” electric machines. >>, that is to say not waterproof.
    In air cooling systems of "closed" (sealed) electric machines, which are limited to cooling the outside of the machine housing, forced air convection by means of a fan secured to the shaft is performed, and the heat generated at the rotor is transferred to the air in the air gap and to the stator, itself being evacuated by the casing. However, such systems do not dissipate satisfactorily the heat generated within the machine, in particular at the level of the rotor, which makes it difficult to use, especially for cooling very fast rotating electrical machines. The efficiency of such air cooling systems of closed machines is therefore limited, and their use is again reserved for low power machines.
    Objectives and summary of the invention
    The present invention aims to overcome the drawbacks of the prior art mentioned, and to provide an efficient cooling system for a closed rotary electric machine, in order to guarantee the desired performance and efficiency of the electric machine.
    In particular, the present invention aims to allow efficient cooling of the shaft, of the rotor, and more specifically of the permanent magnets housed near the flow barriers carried by the rotor, and of the coil heads, of a rotating electric machine. may have a high "IP" protection index in accordance with standard EN 60529, typically an IP67 protection index.
    The invention further aims to provide a cooling system which does not consume (passive system) or little electrical energy to operate, and which limits the mechanical losses linked to the operation of the system.
    Thus, to achieve at least one of the abovementioned objectives, among others, the present invention provides a closed rotary electrical machine comprising:
    - a stator arranged in a carcass and comprising coils;
    - a rotor comprising a body fixed to a rotation shaft rotating about a central axis (X), the rotor being rotatably mounted in the stator and comprising first recesses housing magnetic flux generators and second recesses forming barriers magnetic fluxes, the first and second recesses being elongated and passing through the rotor body along the axis (X);
    - a pair of bearings each supporting one end of the rotation shaft;
    a front flange and a rear flange disposed respectively at two opposite front and rear ends of the carcass, the front and rear flanges each comprising sealing means for sealingly closing the carcass, an internal face, an external face, and a central housing for receiving one of the bearings, the internal face of the flanges comprising fins arranged on a peripheral part of the central housing, and
    - a cooling system comprising a pair of internal fans, each internal fan being mounted fixed on the rotation shaft between the rotor body and one of the bearings, to create during the rotation of the shaft, a first flow of two-way air in the second recesses of the rotor and a second air flow between each internal fan and the internal face of the front or rear flange.
    Preferably, each internal fan has an internal face, an external face, a central opening for the passage of the rotation shaft, and an alternation of open radial sectors and closed radial sectors dividing the surface of the internal fan and separated by radial walls orthogonal to the axis (X) forming protruding blades on the external face of the internal fan.
    Advantageously, the internal fans have a circular shape, their internal face comprising a flat part resting on the rotor body and orthogonal to the central axis (X), the orthogonal flat part being extended by a flat part inclined at the level of each radial sector closed and by an opening at each open radial sector.
    Preferably, the rotor has n magnetic poles created by the flow generators and the flow barriers, each magnetic pole being covered by two closed and open radial sectors adjacent to an internal fan, and the two internal fans being mounted angularly offset on the rotation shaft so as to correspond an open radial sector of an internal fan with a closed radial sector of the other internal fan along the same axis substantially parallel to the central axis (X).
    Preferably, the set of open and closed radial sectors of an internal fan is equal to 2.n, and the two internal fans are mounted offset on the rotation shaft by an angle β equal to 360 / (2. η), n being an even integer between 2 and 12, and preferably equal to 4 or 8.
    Advantageously, the internal fans and the fins of the internal face of the flanges are able to direct the air radially towards the heads of the stator coils, then return the air flow from the coil heads to the center of the flanges. first along a direction parallel to the axis (X) at the level of the coil heads, then radially towards the rotation shaft, to form the second air flow created between each internal fan and the internal face of the front flange or back.
    The fins of the internal face of the flanges can be flat and have a general shape of a trapezoid comprising bases orthogonal to the central axis (X) and a side opposite the housing having a concavity.
    Advantageously, the machine further comprises external cooling means for cooling the carcass and the front and rear flanges.
    According to one embodiment, the external cooling means comprise an external fan disposed opposite the external face of the rear flange and mounted fixed on the rotation shaft, to send outside air along the carcass towards the front flange.
    According to this embodiment, the carcass can have an external surface comprising a set of cooling fins elongated substantially along an axis parallel to the axis (X) of the rotation shaft, and the rear flange comprising a central part in crown shape connected to a cylindrical peripheral part and at least one opening arranged between the central part and the peripheral part of the rear flange to direct the outside air sent by the external fan into passages formed by all of the cooling fins of the external surface of the carcass.
    The external fan preferably comprises an external air drive wheel fixed to the rotation shaft and a protective plate having holes for the entry of external air, the plate being fixed to the peripheral part of the rear flange.
    According to another embodiment, the external cooling means comprise a coolant circuit comprising an inlet for the coolant, an outlet for the coolant, and a network of conduits in contact with the carcass, in which the coolant cooling circulates to cool the carcass and the front and rear flanges, and in which said network of conduits is preferably a coil integrated in the carcass
    Preferably, the coolant includes water.
    The electric machine according to the invention is preferably an electric machine with synchronous reluctance.
    Other objects and advantages of the invention will appear on reading the following description of examples of particular embodiments of the invention, given by way of non-limiting examples, the description being given with reference to the appended figures described below. -after.
    Brief description of the figures
    FIGS. 1A and 1B are perspective views, respectively from the front and from the rear, of the electric machine according to a first embodiment of the invention in which the cooling of the machine is entirely carried out by air.
    Figure 2 is a perspective view of the rotating part of the electric machine according to the invention on which are mounted two internal fans.
    Figure 3 is a radial sectional view of the rotor of the electric machine according to the invention.
    FIGS. 4A and 4B are perspective views, respectively of the external face and of the internal face, of an internal fan of the electric machine according to the invention.
    FIGS. 5A and 5B are front views respectively of the external face and of the internal face of an internal fan of the electric machine according to the invention.
    FIGS. 6A, 6B and 6C are respectively a diagram of the external face of an internal fan of the electric machine according to the invention, a sectional view of the latter according to a section AA (6B) and according to a section BB ( 6C), the two sections being drawn on the diagram of FIG. 6A.
    Figure 7 is a side view of the rotating part of the electric machine according to the invention incorporating the two internal fans.
    FIGS. 8A and 8B are two same front views of one end (front) of the rotating part of the electric machine according to the invention incorporating an internal fan, FIG. 8B showing the internal fan in transparency.
    FIGS. 9A and 9B illustrate the circulation of air in the rotor, and are respectively a front view of one end of the rotating part of the electric machine according to the invention and a sectional view according to a section CC drawn on Figure 9A.
    FIGS. 10A and 10B are perspective views, respectively of the internal face and of the external face, of the front flange of the electric machine according to the first embodiment of the invention.
    FIGS. 11A and 11B are perspective views, respectively of the internal face and of the external face, of the rear flange of the electric machine according to the first embodiment of the invention.
    Figure 12 is a longitudinal sectional view of the electric machine according to the first embodiment of the invention.
    Figure 13 is a top view of the electric machine according to the first embodiment of the invention.
    Figures 14A, 14B and 14C are perspective views with cutaway of the rear part (Figure 14A) and the front part (Figure 14B) of the electric machine according to the first embodiment of the invention, as well as a longitudinal section view (14C) of the electric machine illustrating the external air flow generated by the external fan and circulating outside the carcass
    FIGS. 15A and 15B are respectively a plan view of the rear face of the electric machine and a perspective view of this same rear face, according to the first embodiment of the invention.
    FIGS. 16A and 16B are perspective views, respectively from the front and from the rear, of the electric machine according to a second embodiment of the invention in which the cooling of the machine is carried out by air and by liquid .
    FIG. 16C is a partial longitudinal section view of the electric machine according to the second embodiment of the invention.
    Figures 17A, 17B and 17C are partial perspective views with cutaway of the front part (Figure 17A) and the rear part (Figure 17B) of the electric machine according to the second embodiment of the invention. Figure 17 C is a view identical to that of Figure 17B further showing the circulation of liquid in the carcass.
    In the figures, the same references designate identical or analogous elements.
    Description of the invention
    The object of the invention is to propose a closed rotary electrical machine integrating a cooling system which comprises two internal fans mounted fixed on the rotor shaft, at the two ends of the rotor, allowing a double circulation of air through the rotor via the flow barriers surrounding the permanent magnets integrated in the rotor. Each internal fan faces the internal face of a flange comprising fins capable of directing the internal air flow created by the internal fans and capable of capturing the heat of the air flow.
    By closed electrical machine means an electrical machine whose rotor and stator are enclosed in a sealed casing, which can also be referred to as the casing.
    According to the invention, the carcass, which contains the rotor and the stator of the electric machine, is sealed with two flanges.
    The cooling system can also include external cooling means for cooling the carcass and the flanges, which can be by air or by liquid.
    In the description, by internal air is meant the air contained in the closed electrical machine, more precisely the air enclosed in the sealed casing of the machine, and by external air the air outside the closed rotating electrical machine.
    Figures 1A and 1B show a closed electric machine according to a first embodiment of the invention, which can be used as an electric traction motor in an electric or hybrid vehicle.
    For example, a motor as shown in FIGS. 1A and 1B is a variable synchronous reluctance motor, also called synchro-reluctant, with a continuous power of 30 kW, with transient power (Peak) 52 kW, and capable of operating with a DC bus supply voltage of 350 V. It is a synchro-reluctant machine assisted by permanent magnets.
    Although advantageously applying to electric machines with variable synchronous reluctance, the present invention is not limited to this topology of electric machine, and more generally relates to any type of electric machine comprising a rotor with flow barriers constituted by recesses passing through the rotor right through. The electric machines according to the invention have for example a transient power (peak: transient for 30 seconds) of between 20 kW and 400 kW. More specifically, the electric machines according to the first embodiment can have a power between 20 kW and 75 kW, and the electric machines according to the second embodiment described below can have a power between 75 kW and 400 kW.
    The electric motor 100 comprises a carcass 130 sealed in a sealed manner by a front flange 110 and a rear flange 120. The stator, with its coils, and the rotor of the electric motor are contained in the waterproof carcass 130. The interior of the carcass 130 is better represented in FIG. 12, described in detail below in relation to the engine cooling system. A terminal box (not referenced) in which the connections are made is fixed to the carcass 130, in particular at the flange 110 which closes the carcass at the front of the engine. The carcass 130 and the flanges 110 and 120 are advantageously made of metal, for example aluminum or iron.
    According to the first embodiment of the invention, the external cooling means comprise an external fan 140 disposed opposite the external face of the rear flange 120 and mounted fixed on the rotation shaft 160 of the rotor, to send outside air along the carcass 130 in the direction of the front flange 110.
    The rotation shaft 160, rotating around the central axis (X), is carried by the front 110 and rear 120 flanges disposed respectively at two opposite front and rear ends of the carcass 130: the front flange 110, disposed at a first end of the carcass 130, supports the drive side of the load of the rotation shaft 160, and the rear flange 120, disposed at a second end of the carcass opposite the first end, supports the side opposite to the side for driving the load of the rotation shaft 160.
    In the rest of the description, the front of the machine will designate the side of the machine where a load is driven by the rotation shaft of the rotor, and the rear of the machine the opposite side.
    More specifically, the front 110 and rear 120 flanges each have an internal face (111, 121), an external face (112, 122), and a central housing (116a, 126a), positioned in a median part of the internal face ( 111, 121), to receive a bearing, as shown in FIGS. 10A, 10B, 11A and 11 B. The bearings 171 and 172, visible in FIG. 7, support the drive side of a load 160a of l rotation shaft 160 and the side opposite to the drive side of the load 160b of the rotation shaft.
    The front 110 and rear 120 flanges have sealing means for sealingly closing the carcass 130.
    Figure 2 is a perspective drawing of the rotating part of the electric machine on which are mounted two internal fans 181 and 182 which are part of the cooling system of the machine according to the invention.
    According to the invention, the cooling system comprises a pair of internal fans (181, 182), each internal fan being fixedly mounted on the rotation shaft 160 between the body of the rotor 150 and one of the bearings (171, 172). During the rotation of the shaft, the pair of internal fans (181, 182) arranged inside the carcass 130 and integral with the shaft, makes it possible on the one hand to create a first double air flow direction within the rotor, through the recesses 28 forming the magnetic flux barriers, and on the other hand a second air flow between each internal fan and the internal face of the flange positioned opposite the fan.
    The internal fans indeed allow an injection of air axially into the rotor, in the form of a two-way air flow, which leads to cooling of the internal magnets of the rotor. The fans also allow, in interaction with the flanges, to cool the stator coil heads, as well as the shaft and the rotor of the electric machine, by means of the second air flow inside the carcass.
    Before describing in more detail the operation of the cooling inside the carcass 130, the structure of the rotor, then that of the internal fans, are detailed below.
    The rotor 150 of the machine, rotatably mounted in the stator, comprises a body fixed to the rotation shaft 160. The rotor comprises, in a manner known per se, a stack of identical flat sheets 14, preferably ferromagnetic. The rotor comprises a plurality of magnetic flux generators 16, here permanent magnets in the form of a rectangular bar of length substantially equal to the length of the rotor body, surrounded by flux barriers formed by axial recesses 28 (elongated along the axis X) passing through the sheets 14 right through. The magnetic flux generators 16 are housed in axial recesses also passing right through the rotor. The magnetic flux generators 16 and the recesses 28 forming the flux barriers are distributed radially in the rotor to form magnetic poles 20, for example 8 in number, as illustrated in FIG. 2.
    Figure 3 shows in more detail the rotor of the machine, in a radial section view. The flow generators 16 are not shown. The sheets 14 of circular shape include a central bore 18 traversed by the rotation shaft 160 and a plurality of axial recesses which pass through the sheets from side to side.
    As is known, the sheets are assembled to each other by matching the bores and the recesses by any known means, such as gluing, pressing, etc. Thus assembled, the sheets form the body of the rotor 150 which carries the shaft 160.
    In this configuration, the body comprises a first series of axial recesses 22 which houses magnetic flux generators 16 and another series of axial recesses 28 which makes it possible to create magnetic flux barriers.
    The first series of axial recesses 22 is for example in the form of a quadrilateral, here rectangle. These recesses 22 receive the magnetic flux generators 16 (not shown), e.g. permanent magnets in the form of also rectangular bars of length substantially equal to the length of the body. These recesses are called in the following description of housing.
    These housings 22, here three in number, are arranged radially one above the other and at a distance from each other from the center O of the bore 18.
    This series of three housings is repeated circumferentially around the point O, along four axes AA ', BB', CO and DD 'offset by an angle of 45 °, to form a succession of series regularly distributed around the point O.
    Thus, as illustrated in FIG. 3, each half-axis (OA, OA '; OB, OB'; OC, OC '; OD, ODj carries three axial housings 22 whose longer faces are perpendicular to the half-axes and whose dimensions of these faces are decreasing from the center O towards the periphery of the sheet.
    The housing 22 closest to the bore 18 leaves a material bridge 24 with this bore and a material bridge 26 remains between each housing.
    The housing 22 furthest from the bore 18 is placed at a distance from the peripheral edge of the body.
    The other series of recesses consists of perforations 28, of substantially constant thickness e and of inclined radial direction, which leave from the housings 22 to arrive in the vicinity of the edge of the sheets 1 4. These perforations leave from the lateral edge 30 of the housings 22 and rise at an angle a from a plane passing through one of the longer length faces of the housings to reach this vicinity.
    As shown in Figure 3, the inclined perforations are arranged symmetrically with respect to the housings 22. More specifically, a series of three inclined perforations is placed on one side of the semi-axis and another series of three inclined perforations is placed on the other side of this same semi-axis.
    Thus, a geometrical figure is formed each time substantially in the form of a V with a flattened bottom with the flat bottom formed by the housing 22 and with the inclined arms of this V formed by the perforations 28. In this case, each half is obtained axis, three V-shaped shapes superimposed and spaced from each other and of dimensions in height and width which decrease from the bore 18 towards the periphery of the body.
    Thus, in addition to the material bridges 24, 26, there remains a solid part 32 between the inclined perforations 28 of each V-shape, and another solid part 34 between the perforation 28 closest to the bore 18 of a series. of three V-shapes and the perforation 28 closest to the bore 18 of another series close to three V-shapes
    This creates flow barriers formed by the perforations 28. The magnetic flux from the magnets can then only pass through the material bridges and the solid parts. Two perforations 28 will be designated as forming a flow barrier arranged on either side (on each side of the semi-axis) of a magnet housed in a housing 22 and starting from the edges 30 of said housing 22.
    Each assembly formed the three magnetic flux generators 16 housed in the three housings 22 aligned along a half-axis (OA, OA '; OB, OB'; OC, OC '; OD, ODj and the three perforations 28 on the part and d other magnet, or six perforations 28 for the three magnets, constitutes a magnetic pole 20 of the rotor, here 8 in number. In the rotor of the machine according to the invention, each magnetic pole comprises at least one magnet and at least a magnetic flux barrier.
    The number n of magnetic poles 20 of the rotor, created by the flux generators 16 and the flux barriers, is an even integer preferably between 2 and 12, and is preferably equal to 4 or 8, and preferably equal to 8 as illustrated in FIG. 3. The number of poles depends mainly on the diameter of the rotor. Generally, the greater the number of poles, the greater the torque with less current, but the more complex the control of the motor because this has an impact on the electric frequency of the motor.
    The rotor body 150 may further comprise, in the material bridge 24 and in the vicinity of the bore 18 for receiving the shaft 160, cavities 36, for example eight cavities in the form of a quadrilateral as illustrated in FIG. Figure 3, distributed evenly around the center O, preferably between each half-axis, to lighten the rotor. These cavities 36 are elongated along the axis X in the rotor and pass right through it (from the front to the rear of the machine). Cavities of this type, which may have a closed section of another shape such as polygonal or pentagonal, can also serve to receive dynamic balancing masses of the rotor. The balancing weights can be, for example, balls or bars of circular section. The cavities 36 may result from a punching carried out on each sheet and from the assembly of the sheets with each other, thus forming this cavity.
    With reference to FIG. 2, but also to FIG. 7 showing the rotating part of the electric machine this time provided with the two internal fans 181 and 182 according to a side view, the first internal fan 181 is mounted fixed on the shaft of rotation 160, between the rotor body 150 and the bearing 171 which supports the rotation shaft 160 on the drive side of the load 160a. It is therefore arranged on the front side of the engine, and faces the internal face 111 of the front flange 110 of the engine. Symmetrically, the internal fan 182 is fixedly mounted on the rotation shaft 160, between the rotor body 150 and the bearing 172 which supports the rotation shaft 160 on the side opposite to the drive side of the load 160b. It is therefore arranged on the rear side of the engine, and faces the internal face 121 of the rear flange 120. The bearings 171, 172 are for example with ball bearings, as visible in FIGS. 8A and 8B showing the front face of the rotating part illustrated in FIG. 7. The internal fans 181 and 182 are for example formed from aluminum and obtained by molding (“die casting” in English).
    The two internal fans 181 and 182 have an identical structure.
    To create specific air circulation within the carcass, the internal fans 181, 182 preferably have the following structure: each internal fan (181, 182) comprises:
    an internal face, as shown in FIGS. 4B and 5B, oriented towards the body of the rotor 150,
    an external face, as shown in FIGS. 4A and 5A, oriented towards the flange closing the carcass,
    a central opening 6 for the passage of the rotation shaft 160, and
    - An alternation of open radial sectors 2 and closed radial sectors 3 dividing the surface of the fan and separated by radial walls orthogonal to the central axis (X), said walls forming protruding blades 13 on the external face of the fan.
    The open radial sectors 2 have openings 2 'and allow the entry of air into the recesses 28 of the rotor, and the closed radial sectors 3 have a ramp-shaped surface (3, 3', 3 ”) and allow the outlet of the air flowing in the recesses 28 of the rotor, according to a circulation diagram described later in relation to FIGS. 9A and 9B.
    The surface of the internal fan is more precisely divided into 2.n radial sectors 1 regularly distributed angularly, the 2.n radial sectors being distributed according to an alternation of open radial sectors 2 and closed radial sectors 3. The number of open radial sectors 2 is equal to the number of closed radial sectors 3. The angle β formed between two radial walls delimiting each radial sector 1 is equal to 360 / (2.n). Recall that n is the number of magnetic poles 20 of the rotor. Preferably, n is between 2 and 12, preferentially equal to 4 or 8, and more preferentially is equal to 8. Thus, the internal fan comprises 8 radial sectors 1 when the rotor has 4 magnetic poles, and 16 radial sectors 1 in the more preferred case where the rotor has 8 magnetic poles, as illustrated in the figures. In the case where the rotor comprises 8 magnetic poles, the internal fans each comprise 16 radial sectors, with an angle β equal to 22.5 °.
    The internal fans preferably have a circular shape, their internal face comprising a plane part 4 orthogonal to the central axis (X) and bearing on the body of the rotor 150, said orthogonal plane part 4 extending radially from the central opening 6 towards the periphery of the fan, and continuing either by a flat inclined part 3 'at the level of the closed radial sectors 3, itself followed by a flat part 3 ”orthogonal to the axis X', or by an opening 2 'at the level of the open radial sectors 2, said opening being partly delimited by the radial side walls 13. The parts 4, 3' and 3 ”at the level of the closed radial sectors 3 create a ramp-shaped surface allowing the air leaving the recesses 28 to slide over this surface and to be sent in the direction of the stator.
    The flat part 4 of the internal face of the internal fans covers the part of the body of the rotor 150 comprising the cavities 36 at each open radial sector 2, so as to create an air circulation only in the flow barriers formed by the recesses 28.
    The fans 181 and 182 may comprise a ring 7 for fixing to the body of the rotor 150 provided with orifices 8 for the passage of screws, to possibly improve or replace a fixing by pressurizing the internal fan on the rotation shaft 160. The ring 7 can then form the central opening 6 of the internal fan. The ring 7 projects from the external face of the fans 181 and 182.
    The external face of the internal fans comprises the axially projecting blades 13 formed by the radial walls separating the radial sectors 1, which allow both to direct the air in the openings 2 ′ of the open radial sectors 2 to send it into the recesses 28, and which are also involved in the circulation of air produced between each internal fan and the internal face of the front or rear flange, by sending the air to the stator coil heads. The blades 13 arise near the central opening 6, at the edge of the ring 7.
    The external face of the internal fans has a flat part 5 orthogonal to the axis (X) surrounding the ring 7 and carrying the ends of the projecting blades
    13. At an open radial sector 2, the flat part 5 is extended towards the periphery of the fan by an inclined flat part 5 'forming a bevel with the flat part 4 of the internal face of the fan to make room for the opening 2 '. At a closed radial sector 3, the flat part 5 is extended towards the periphery of the fan by an inclined part 9 'which is parallel to the part 3' of the internal face, itself followed by a part 9 ”parallel to the 3 ”part of the internal face.
    This structure of the closed 3 and open 2 radial sectors is clearly visible in FIGS. 6B and 6C corresponding to sectional views respectively of an open radial sector 2, along the line AA shown in FIG. 6A, and of a radial sector closed 3, along line BB shown in Figure 6A. The arrows in Figures 6B and 6C represent the air entering and leaving the rotor. FIG. 6A is a schematic view of the external face of an internal fan.
    Each internal fan is mounted such that two adjacent closed and open radial sectors cover a magnetic pole of the rotor. This configuration is clearly visible in FIGS. 8A and 8B showing the front face of the rotary part of the electric machine provided with the fan 181. FIG. 8B is identical to FIG. 8A except that the fan 181 is shown in transparency for better understanding of the arrangement of the radial and closed sectors with respect to the magnetic poles of the rotor 150, comprising the magnets 16 surrounded by the magnetic flux barriers formed by the recesses 28. FIG. 9A shows the view of FIG. 8B, showing the front face of the rotor part fitted with the fan 171, on which are shown hatched white arrows 2000 and solid black arrows 3000 illustrating respectively the internal air entering the rotor through the open radial sectors 2 and leaving the rotor through the closed radial sectors 3, during the rotation of the rotor.
    In addition, the two internal fans 181, 182 are mounted angularly offset on the rotation shaft by an angle equal to β, or equal to 360 / (2.n). This offset makes it possible to match an open sector 2 of an internal fan with a closed sector 3 of the other internal fan along the same axis substantially parallel to the central axis (X), as illustrated in the figure 7.
    In this way, it is possible to create a two-way air flow within the rotor, as illustrated in FIG. 9B which represents a sectional view of the electric machine according to section C-C 'drawn in the FIG. 9A: the internal air enters on one side of the machine through the opening 2 ′ of an open radial sector 2, as illustrated with the arrows 2000, circulates in the recesses 28 located on the same side of the magnets 16, as illustrated by the solid white arrows 5000, and comes out on the other side of the machine by a closed radial sector arranged in the axial extension of the open radial sector 2, thanks to the offset mounting of the fans according to the angle β. The direction of air flow is for example from the rear to the front of the machine as shown in the upper part of Figure 9B. At the same time, for the same magnetic pole of the rotor, the internal air enters the rotor, circulates there and leaves it in the opposite direction, from the front to the rear of the machine, at the recesses 28 located on the other side of the same magnets 16, according to the circulation diagram shown in the lower part of Figure 9B. There is thus produced a two-way air flow in the rotor, a front / rear direction of the machine and a reverse rear / front direction of the machine, the air circulating in one direction in the axial recesses 28 located from one side of the magnets and the air flowing in the opposite direction for the recesses located on the other side of the magnets, for each magnetic pole.
    By this two-way air flow within the rotor, the flow generators 16 capable of generating heat are effectively cooled, the circulating air itself giving off heat to the flanges and to the carcass via the second flow. of internal air produced between each internal fan and the internal face of the front or rear flange.
    This second internal air flow is better described below.
    The front 110 and rear 120 flanges sealingly closing the carcass 130 are involved in the circulation of internal air and in the cooling of the electric machine.
    The front flange 110 is shown in Figures 10A and 10B.
    The front flange 110 comprises a central part in the form of a crown 118a and a peripheral part of cylindrical form 118b.
    The front flange 110 has an internal face 111 turned towards the inside of the carcass 130, visible in FIG. 10A, an external face 112, visible in FIG. 10B, and a central housing 116a, positioned in the middle part of the face internal, intended to receive the bearing 171. This housing 116a has in its center an orifice 116b provided for the passage of the rotation shaft 160 of the rotor. Seals (114b, 114a) are provided at the level of the orifice 116b for passage of the shaft 160 and on the perimeter of the peripheral part 118b intended to come into contact with the carcass 130. The peripheral part 118b of the flange 110 also includes fixing points 115, for example four in number as illustrated, for fixing the front flange 110 to the carcass 130.
    According to the invention, the internal face 111 of the front flange 110 comprises a set of fins 113, arranged on the periphery of the central housing 116a. These fins 113 have the function of orienting the air flow created by the rotation of the internal fans (181, 182) and leaving the rotor 150, as described below in connection with FIG. 14, and of capturing the heat of this air flow. The internal face 111 of the front flange 110 comprises for example twelve fins 113.
    The fins 113 are preferably distributed regularly around the housing 116a. Preferably, the fins and the body of the flange form a single entity (monobloc), for example resulting from a manufacture using a mold. Advantageously, the fins have a shape such that they contribute to a specific internal air circulation which effectively cools the coil heads and the rotating part of the machine. Each fin is preferably flat, and has a general shape of a trapezium whose bases (parallel opposite sides) are orthogonal to the axis (X), and whose side opposite to the housing 116a is not straight but curved, having a concavity (relative to a point located at the periphery 118b of the flange in the radial extension of the fin). This concavity of the fin edge ensures optimal proximity to the coil heads while ensuring an optimized air flow for efficient cooling. This description of the fins is made on the basis of the parts visible on the surface of the flange (and not on the basis of a section of the flange). According to a longitudinal section passing through the fin, the latter has a general shape of a rectangular trapezium whose side forming a right angle with the bases constitutes the wall of the housing 116 (visible in FIG. 14). The internal fins have a sort of bird's wing shape, the scapular part of which is opposite the internal face of the flange. The dimensions of the fins are such that a maximum space is left between the internal fan and the top part of the fins 113a facing the internal fan, so as to maintain proximity to the internal fan suitable for good air circulation in the free space left between the flange and the internal parts of the machine. By way of non-limiting example, a space of 4 to 5 mm is left between the internal fan and the top 113a of the fins, for a device comprising flanges with an internal diameter of approximately 20 cm fitted with internal fins of approximately 20 mm long, the length of the fins (or height) being understood as the dimension of the fins along the axis (X).
    Preferably, the peripheral part 118b of the front flange 110 further comprises heat dissipating fins 117 on its external face 112. The dissipative fins 117 are elongated substantially along an axis parallel to the axis (X) of the rotor. When the carcass 130 has an external surface comprising a set of cooling fins 131, as detailed in FIG. 13, the fins 117 of the front flange 110 then extend the passages formed by the cooling fins 131 of the carcass 130.
    The rear flange 120 is shown in FIGS. 11A and 11B.
    The rear flange 120 has a central part in the form of a crown 128a connected to a cylindrical peripheral part 128b.
    As for the front flange 110, the rear flange 120 has an internal face 121 facing towards the inside of the carcass 130, visible in FIG. 11A, an external face 122, visible in FIG. 11B, and a central housing 126a, positioned in the middle part of the internal face, intended to receive the bearing 172. This housing 126a has in its center an orifice 126b provided for the passage of the rotation shaft 160. Seals (124b, 124a) are provided at the orifice 126b for passage of the shaft 160 and on the perimeter of the central part 128b intended to come into contact with the carcass 130. The peripheral part 128b and the central part 128a of the rear flange 120 have connections 125 which also include the points of attachment of the flange to the carcass. For example, the rear flange has four connections 125 with four fixing points (holes for the passage of screws for example).
    According to the invention, the internal face 121 of the rear flange 120 comprises, in the same manner as for the front flange 110, a set of fins 123, arranged at the periphery of the housing 126a of the bearing. These fins 123 have the same function of orienting the air flow created by the rotation of the internal fans and leaving the rotor 150, as described below in relation to FIG. 14, and of capturing the heat of this flow of air. The internal face 121 of the rear flange 120 comprises for example twelve fins 123.
    The fins 123 are preferably distributed regularly around the housing 126a. Their shape and their dimensions are preferably identical to those of the fins 113 of the internal face 111 of the front flange 110, described above. As for the fins 113, the dimensions of the fins 123 are such that a maximum space is left between the internal fan and the top part of the fins 123a facing the internal fan 182.
    The rear flange 120 has at least one opening 127 arranged between the central part 128a and the peripheral part 128b to direct the outside air sent by the external fan 140 along the carcass 130, in particular to direct this air in passages formed by all of the cooling fins 131 of the external surface of the carcass 130. The rear flange 120 comprises for example four openings of this type, as illustrated in FIGS. 11A and 11 B. These openings 207 have for example a shape d arc of a circle, and are distributed uniformly around the perimeter of the central part 128a of the flange 120.
    Figure 12 is a sectional view of the motor 100 according to the first embodiment of the invention, detailing the elements of the machine and illustrating the air flow between each internal fan and the internal face of the front or rear flange to the interior of the sealed carcass (air flow 192 represented by the arrows) caused by the interaction between the internal fans 181 and 182 in operation and the structural elements of the machine within the carcass 130, in particular the structure of the internal faces of the flanges 110 and 120.
    The motor 100 comprises the stator 190, disposed in the carcass 130, comprising coils and in which is rotatably mounted the rotor 150 fixed to the rotation shaft 160. The engine cooling system comprises on the one hand the pair internal fans 181 and 182, in interaction with the fins of the flanges, and on the other hand external cooling means, ie the external fan 140 according to the first embodiment, for cooling the carcass and the front and rear flanges.
    In addition to creating a two-way air flow within the rotor, the internal fans 181 and 182, during the rotation of the rotor, interact with the fins 113 and 123 of the internal faces 111 and 121 of the front and rear flanges ( 110, 120) to create an air flow between each internal fan and the internal face of a flange, the heat of which is captured by the fins of the internal faces of the flanges.
    More specifically, the fins (113, 123) of the internal face (111, 121) of the front and rear flanges (110, 120) are capable of directing the air flow 192 leaving the rotor radially towards the heads 191 of the stator coils 190 (flow in a direction which is centrifugal around the axis (X) of the rotation shaft 160), then return the air flow from the coil heads 191 to the center of the flange, d 'first in a direction parallel to the axis (X) at the level of the coil heads, then radially towards the rotation shaft (flow parallel to the axis (X) then in a centripetal direction around the axis (X )). Such an air flow is thus produced on the front and rear side of the motor, on either side of the rotor 150. The fins of the internal faces of the flanges 113 and 123, in addition to directing the outgoing internal air flow of the rotor, make it possible to dissipate the heat from the air flow and therefore to cool the heads 191 of the coils, as well as the shaft 160 and the rotor 150 of the electric machine.
    The heat from the internal air is partly removed by contact with the flanges and the casing of the electric machine.
    The fan 140, positioned on the external face of the rear flange 120, contributes to the cooling of the carcass 130 and of the flanges by the generation of an external air flow, which is first directed radially towards the periphery of the external face of the rear flange 120, then which is directed towards the front flange 110 parallel to the axis of rotation (X), so as to sweep the outer surface of the carcass 130 preferably provided with cooling fins 131, and preferably surmounted by the plates metallic 132 which confine the air flow to the external surface of the carcass 130.
    FIG. 13 corresponds to a "top" view of the engine according to the first embodiment of the invention, showing in more detail the exterior of the carcass, in particular the lateral part of the engine. The carcass 130, typically made of metal, for example of iron or aluminum, may have on its external surface a set of cooling fins 131, elongated along an axis substantially parallel to the axis of the rotor (X).
    By substantially parallel to the axis (X), is understood to be more or less 25 ° degrees relative to this axis (X). The purpose of these cooling fins 131 is to increase the surface area for the carcass to exchange with air for greater heat dissipation, and to direct the flow of air external to the surface of the carcass so as to cover the entire length of the carcass from one flange to another. Continuity in the passage of the external air flow is created when the peripheral part of the front flange 110 also includes dissipation fins 117, preferably oriented in the same direction as the cooling fins of the carcass 130, thereby improving the cooling of the carcass and the front flange.
    Advantageously, the electric motor further comprises metal plates 132, preferably of aluminum, mounted on the carcass 130 and surrounding the cooling fins 131, in order to maintain the air close to the external surface of the carcass 130 and the fins of cooling 131 during its circulation along the carcass. In the example of a motor shown in FIG. 13, the metal plates 132 are slightly curved so as to follow the shape of the external surface of the carcass. In FIG. 13, the metal plates 132 are shown with transparency in order to reveal the structure which they surmount. It is the same for the rear flange 120, allowing the external fan 140 to be seen in transparency. The metal plates 132 are preferably distributed regularly around the carcass, for example eight plates are fixed on the carcass, grouped two by two to form spaced units around the carcass.
    The metal plates 132 are mounted on the carcass so as to leave a passage for the circulation of the outside air sent by the external fan 140. Thus, as is clearly visible in FIG. 14A described below, the metal plates 132 can rest on the peripheral part of the rear flange 120.
    The external air preferably passes through the passages formed between the cooling fins 131 elongated substantially along the axis (X), while being confined to the space formed between the metal plates and the external surface of the carcass 130. Advantageously, the openings 127 of the rear flange 120 allow the passage of the outside air sent by the fan 140 from the external face of the flange to the external surface of the carcass 130 preferably provided with cooling fins 131.
    The external air flow is represented by arrows 193 in FIGS. 14A, 14B and 14C, which show the engine according to the first embodiment respectively in a rear view, a front view and a longitudinal section.
    The external fan 140 is clearly visible in FIGS. 15A and 15B, which are respectively a plan view of the rear face and a perspective view of this same rear face of the motor according to the first embodiment.
    The external fan 140 comprises an external air drive wheel fixed to the rotation shaft 160 and a protective plate 129 fixed to the peripheral part 128b of the rear flange 120. The protective plate 129 has orifices 129a for the entry of the outside air which is sucked in by the fan drive wheel 140. The external fan 140 is larger than that of the internal fans 181 and 182. The size of the fan 140 is chosen according to the engine power and maximum speed, to ensure optimal cooling. The drive wheel can be a flat surface provided with ventilation fins, for example 13 in number as shown in FIGS. 15a and 15B, regularly distributed around the central axis (X).
    According to a second embodiment, illustrated in FIGS. 16A, 16B, 16C and 17A, 17B, 17C, the machine according to the invention comprises a device for cooling by liquid the carcass of the engine.
    Similarly to the engine according to the first embodiment of the invention, the engine 200 comprises:
    - A stator 290 disposed in a carcass 230, said stator 290 comprising coils;
    - A rotor 250 comprising a body fixed to a rotation shaft 260 rotating about a central axis (X), the rotor 250 being rotatably mounted in the stator and comprising housings 22 housing magnetic flux generators 16 and recesses 28 forming flow barriers, the housings 22 and the recesses 28 being elongated and passing through said rotor body along the axis (X);
    - A pair of bearings (271, 272) each supporting one end of the rotation shaft: a drive side of a load 260a of the rotation shaft 260 and a side opposite to the drive side 260b of the load of the rotation shaft 260;
    - A front flange 210 disposed at a first end of the carcass 230 and supporting the drive side 260a of the load of the rotation shaft 260;
    - A rear flange 220 disposed at a second end of the carcass 230 opposite the first end, and supporting the side opposite to the drive side 260b of the load of the rotation shaft 260;
    the front and rear flanges comprising sealing means for sealingly closing the carcass 230, and each comprising an internal face, an external face, and a housing (216a, 226a) positioned in a median part of the internal face to receive one of said bearings; and
    - a cooling system comprising a pair of internal fans (281, 282) arranged inside the carcass to create an air flow inside the carcass during the rotation of the rotor, each fan being mounted fixed on the rotation shaft between the rotor body and a bearing;
    the internal face of the flanges comprising fins (213, 223) arranged on a peripheral part of the bearing housing to direct the internal air leaving the rotor and to capture the heat.
    According to this second embodiment, the cooling of the interior of the machine is identical to that described in relation to the first embodiment of the invention, that is to say a pair of internal fans, each internal fan being fixedly mounted on the rotation shaft 260 between the body of the rotor 150 and one of said bearings, making it possible to create, during the rotation of the shaft, a first two-way air flow in the recesses 28 of the rotor and a second air flow between each internal fan and the internal face of the front or rear flange with an interaction between the internal fans (281, 282) and the fins (213, 223) of the internal faces of the front and rear flanges.
    According to this second embodiment, the external cooling means for cooling the carcass and the front and rear flanges include a coolant circuit. This circuit comprises an inlet 233 for the coolant, an outlet 234 for the coolant, and a network of conduits 235 in contact with the carcass 230, in which a coolant, such as water, or any other liquid able to cool the machine, circulates to cool the carcass 230 and the front flanges 210 and rear 220.
    Advantageously, the network of conduits is a coil 236 integrated in the carcass 230, as is better visible in FIG. 17C, where the circulation of water in the coil is shown, the openings 235 corresponding to the coil seen in section in the other Figures 16C, 17A and 17B.
    In the example of motor 200 represented in FIGS. 16A to 16C and 17A to 17B, the motor is closed, that is to say that the motor comprises a sealed housing formed by the carcass 230 and the front flanges 210 and rear 220 The flanges tightly close the carcass. More specifically, the front flange 210 and a part of the carcass 230 form a single piece, and the rear flange 220 and a part of the carcass 230 form a second unitary part, the meeting of the two parts forming the sealed housing, and allowing the integration of the coil in the carcass 230.
    The liquid cooling circuit makes it possible to cool the entire carcass 230 of the engine 200, including the flanges 210 and 220, by heat exchange between these elements and the coolant.
    The present invention advantageously applies to motors with variable synchronous reluctance, and preferably to machines having a power of between 20 kW and 400 kW. By way of nonlimiting example, the cooled motor according to the invention can be a variable synchronous reluctance motor with a continuous power of 30 kW, of transient power (Peak) 52 kW, capable of operating with a supply voltage of the 350 V DC bus, and which can have the following dimensions: external diameter of the rotor 134 mm, external diameter of the stator of 200 mm, external diameter of the carcass of 250 mm, length of the motor of 214 mm, length of the active part ( corresponding to the length of the stack of rotor sheets) of 100 mm.
    权利要求:
    Claims (14)
    [1" id="c-fr-0001]
    1. Closed rotating electric machine (100, 200) comprising:
    - a stator (190, 290) arranged in a carcass (130, 230) and comprising coils;
    - a rotor (150, 250) comprising a body fixed to a rotation shaft (160, 260) rotating about a central axis (X), said rotor being rotatably mounted in the stator and comprising first recesses (22) accommodating magnetic flux generators (16) and second recesses (28) forming magnetic flux barriers, said first and second recesses being elongated and passing through said rotor body along the axis (X);
    - a pair of bearings (171, 172, 271, 272) each supporting one end of the rotation shaft;
    a front flange and a rear flange respectively disposed at two opposite front and rear ends of the carcass, said front and rear flanges each comprising sealing means (114a, 114b, 124a, 124b) for sealingly closing said carcass, an internal face (111, 121), an external face (112, 122), and a central housing (116a, 126a, 216a, 226a) for receiving one of said bearings, said internal face of the flanges comprising fins (113, 123, 213, 223) arranged on a peripheral part of the central housing (116a, 126a, 216a, 226a), and
    - a cooling system comprising a pair of internal fans (181, 182, 281, 282), each internal fan being fixedly mounted on the rotation shaft (160, 260) between the rotor body (150, 250) and a said bearings (171, 172, 271, 272), to create during the rotation of the shaft a first two-way air flow in the second recesses (28) of the rotor and a second air flow between each fan internal and the internal face of the front or rear flange.
    [2" id="c-fr-0002]
    2. Electric machine according to claim 1, in which each internal fan (181, 182, 281, 282) has an internal face, an external face, a central opening (6) for the passage of the rotation shaft (160, 260), and an alternation of open radial sectors (2) and closed radial sectors (3) dividing the surface of the internal fan and separated by radial walls orthogonal to the axis (X) (13) forming protruding blades on the external face of the internal fan.
    [3" id="c-fr-0003]
    3. Electric machine according to claim 2, in which the internal fans (181, 182, 281, 282) have a circular shape, their internal face comprising a flat part (4) resting on the body of the rotor (150, 250 ) and orthogonal to the central axis (X), said flat part (4) extending by an inclined flat part (3j at each closed radial sector (3) and by an opening (2j at each open radial sector (2).
    [4" id="c-fr-0004]
    4. Electric machine according to any one of claims 2 to 4, in which:
    - the rotor has n magnetic poles (20) created by the flow generators (16) and the flow barriers,
    - each magnetic pole (20) is covered by two radial sectors closed (3) and open (2) adjacent to an internal fan, and
    - the two internal fans are mounted offset on the rotation shaft (160, 260) so as to correspond an open radial sector (2) of an internal fan with a closed radial sector (3) of the other internal fan along the same axis substantially parallel to the central axis (X).
    [5" id="c-fr-0005]
    5. Electric machine according to claim 5, in which:
    - the set of open (2) and closed (3) radial sectors of an internal fan is equal to 2.n, and
    - the two internal fans are mounted angularly offset on the rotation shaft (160, 260) by an angle β equal to 360 / (2.n), n being an even integer between 2 and 12, and preferably equal to 4 or 8.
    [6" id="c-fr-0006]
    6. Electric machine according to one of the preceding claims, in which the internal fans (181, 182, 281, 282) and the fins (113, 123, 213, 223) of the internal face (111, 121) of the flanges ( 110, 120) are able to direct the air radially towards the heads (191, 291) of the stator coils (190, 290), then return said air flow from the heads (191, 291) of coils towards the center of the flanges first in a direction parallel to the axis (X) at the heads (191, 291) of the coils, then radially towards the rotation shaft (160, 260), to form the second flow of air created between each internal fan and the internal face of the front or rear flange.
    [7" id="c-fr-0007]
    7. Electric machine according to any one of the preceding claims, in which the fins (113, 123, 213, 223) of the internal face of the flanges are planar and have a general shape of a trapezoid comprising bases orthogonal to the central axis. (X) and a side opposite the housing (116a, 126a, 216a, 226a) having a concavity.
    [8" id="c-fr-0008]
    8. Electric machine according to any one of the preceding claims, further comprising external cooling means for cooling the carcass and the front and rear flanges.
    [9" id="c-fr-0009]
    9. Electric machine according to claim 8, in which the external cooling means comprise an external fan (140) disposed opposite the external face (122) of the rear flange (120) and fixedly mounted on the rotation shaft (160 ), to send outside air along the carcass (130) towards the front flange (110).
    [10" id="c-fr-0010]
    10. Electric machine according to claim 9, in which
    - the carcass (130) has an external surface comprising a set of cooling fins (131) elongated substantially along an axis parallel to the axis (X) of the rotation shaft (160);
    - The rear flange (120) has a central part (128a) in the form of a crown connected to a cylindrical peripheral part (128b), and at least one opening (127) disposed between said central part (128a) and said peripheral part (128b ) of the rear flange (120) for directing the outside air sent by the external fan (140) into passages formed by the set of cooling fins (131) of the external surface of the carcass (130).
    [11" id="c-fr-0011]
    11. An electric machine according to claim 10, in which the external fan (140) comprises an outside air drive wheel fixed to the rotation shaft (160) and a protection plate (129) comprising orifices ( 129a) for the entry of outside air, said plate being fixed to the peripheral part (128b) of the rear flange (120).
    [12" id="c-fr-0012]
    12. An electric machine according to claim 8, in which the external cooling means comprise a coolant circuit comprising an inlet (233) for the coolant, an outlet (234) for the coolant, and a network of conduits ( 235) in contact with the carcass (230), in which the coolant circulates to cool the carcass (230) and the front (210) and rear (220) flanges, and in which said network of conduits (235) is preferably a coil (236) integrated in the carcass (230).
    [13" id="c-fr-0013]
    13. An electric machine according to claim 12, wherein the coolant comprises water.
    5
    [0014]
    14. Electric machine according to one of the preceding claims, with variable synchronous reluctance.
    1/9
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    同族专利:
    公开号 | 公开日
    CN110249509B|2022-01-04|
    WO2018137984A1|2018-08-02|
    FR3062253B1|2020-06-12|
    JP2020505898A|2020-02-20|
    US11005331B2|2021-05-11|
    CN110249509A|2019-09-17|
    EP3574572A1|2019-12-04|
    EP3574572B1|2021-03-31|
    US20190334409A1|2019-10-31|
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    CN204061310U|2014-06-20|2014-12-31|无锡麻德克斯精机有限公司|A kind of wind impeller structure|US11031834B2|2018-04-12|2021-06-08|Ford Global Technologies, Llc|Electric machine rotor end plate with raised flow features|
    CN111327131B|2018-12-13|2021-01-26|东元电机股份有限公司|Rotor structure with differential pressure generating assembly|
    CN113497502A|2020-04-07|2021-10-12|广东德昌电机有限公司|Electric tool, motor and rotor thereof|
    法律状态:
    2018-01-26| PLFP| Fee payment|Year of fee payment: 2 |
    2018-07-27| PLSC| Publication of the preliminary search report|Effective date: 20180727 |
    2020-01-28| PLFP| Fee payment|Year of fee payment: 4 |
    2021-01-25| PLFP| Fee payment|Year of fee payment: 5 |
    2022-01-25| PLFP| Fee payment|Year of fee payment: 6 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1750583|2017-01-25|
    FR1750583A|FR3062253B1|2017-01-25|2017-01-25|CLOSED ROTATING ELECTRIC MACHINE WITH AN AIR COOLING SYSTEM OF THE MAGNETS IN THE ROTOR|FR1750583A| FR3062253B1|2017-01-25|2017-01-25|CLOSED ROTATING ELECTRIC MACHINE WITH AN AIR COOLING SYSTEM OF THE MAGNETS IN THE ROTOR|
    CN201880008509.7A| CN110249509B|2017-01-25|2018-01-17|Enclosed rotating electrical machine comprising an internal air cooling system of the magnets in the rotor|
    US16/479,503| US11005331B2|2017-01-25|2018-01-17|Closed rotating electrical machine comprising an internal air cooling system of the magnets in the rotor|
    EP18700900.6A| EP3574572B1|2017-01-25|2018-01-17|Closed rotating electrical machine comprising an internal air cooling system of the magnets in the rotor|
    JP2019540419A| JP2020505898A|2017-01-25|2018-01-17|Hermetic rotary electric machine with internal air cooling system of magnets in rotor|
    PCT/EP2018/051120| WO2018137984A1|2017-01-25|2018-01-17|Closed rotating electrical machine comprising an internal air cooling system of the magnets in the rotor|
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