• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to a stator, a spacer pack for a stator core and a generator. A spacer pack for reducing vibration of a stator core (134) is disclosed. The stator core may include a plurality of laminations (132) connected to a dovetail of a key bar (126) and separated by a spacer block (136, 139). The spacer pack (134) may include an elongated body (152) extending from a first end (154) including a dovetail slot for connection to the dovetail of the key bar (126) to a second end (158) extending radially at least substantially along an entire length of an adjacent spacer block (136, 139). A stator and a respective generator containing the spacer pack may also be provided.
    公开号:CH710175B1
    申请号:CH01322/15
    申请日:2015-09-11
    公开日:2019-10-15
    发明作者:Kanakamedala Lakshminarayana；Nils Dawson Richard；Kaadaapuram George Jayan
    申请人:Gen Electric；
    IPC主号:
    专利说明:

    Description Background of the Invention The disclosure relates generally to stator cores of a generator, and more particularly to a compression band spacer pack for a stator core and related stator and generator.
    Generators typically use a combination of a rotor and a stator to convert rotational energy to electrical energy. The stator generally includes a stator core with multiple sheets stacked in an annular frame. In certain generator arrangements, a plurality of circumferentially spaced wedge bars are aligned with the longitudinal axis and connected to the annular frame. Dovetails within each wedge bar align with corresponding dovetail slots around the circumference of the stator core segments to secure the core to the annular frame. Due to tight tolerances between the dovetails and the slots, the frame is generally made precisely to place the dovetails precisely. However, because of the operating vibrations generated by the generator, it is a challenge to maintain a tight connection between the stator core and the ring-shaped frame of fixed-mounted generators throughout their life. One attempt to provide a rigid connection is to insert the spacer pack between the stator core sheets, where a section plate of the annular frame is connected to the wedge bars.
    Brief Description of the Invention The invention comprises, on the one hand, a stator for a generator, the stator comprising: a stator frame containing a section plate and a plurality of wedge bars connected to the section plate, each wedge bar having a dovetail; a compression band for radially compressing the wedge bars, the compression band extending around the plurality of wedge bars adjacent to the section plate; a stator core containing a plurality of sheets connected to the plurality of wedge bars; and a compression band spacer positioned between a pair of the plurality of sheets and axially adjacent to the compression band to axially compress the plurality of sheets.
    In any embodiment of the stator, it may be advantageous that the stator also has a spacer block between the pair of the plurality of sheets and the compression band spacer has an axial dimension that is greater than the axial dimension of the spacer block.
    In any embodiment of the stator, it may be advantageous that the stator also has a section plate spacer that is positioned adjacent to the section plate.
    In any embodiment of the stator, it may be advantageous for the compression band spacer to have a length that is greater than that of the section plate spacer.
    In any embodiment of the stator, it may be advantageous for the compression band spacer to have a pair of opposite sides that are configured to form a ventilation space between each opposite side and an adjacent spacer block.
    In any embodiment of the stator, it may be advantageous for each sheet to include a first dovetail slot formed therein to receive one of the plurality of wedge bars, and the compression band spacer has a second dovetail slot formed therein around which the to receive one of the plurality of wedge bars and wherein the second dovetail slot has a cross-sectional area that is smaller than the cross-sectional area of the first dovetail slot.
    In any embodiment of the stator, it may be advantageous for the compression band spacer to have an elongate body that extends from a first end having the second dovetail slot to a second end and that extends radially at least substantially along an entire length of an adjacent spacer block extends between a pair of the plurality of sheets.
    In any embodiment of the stator, it may be advantageous for the compression band spacer to be positioned radially within the compression band.
    [0011] In any embodiment of the stator, it may be advantageous for the compression band spacer to contain a plurality of layers.
    In any embodiment of the stator, it may be advantageous for the compression band to include: a first compression band that extends around the plurality of wedge bars adjacent a first axial side of the section plate to radially compress the wedge bars, and a second compression band extending around the plurality of wedge bars adjacent an opposite, second axial side of the section plate to radially compress the wedge bars; and wherein the compression band spacer includes: a first compression band spacer positioned radially within the first compression band and a second compression band spacer positioned radially within the second compression band.
    In any embodiment of the stator, it may be advantageous for each compression band spacer to be radially aligned with an axial end of the respective first or second compression band that is closest to the section plate.
    The invention, on the other hand, comprises a generator, comprising: a rotor with an axis of rotation; a stator disposed around the rotor, the stator comprising: a stator frame including a section plate and a plurality of wedge bars connected to the section plate, each wedge bar having a dovetail; a compression band for radially compressing the wedge bars, the compression band extending around the plurality of wedge bars adjacent to the section plate; a stator core containing a plurality of sheets connected to the plurality of wedge bars; and a compression band spacer positioned between a pair of the plurality of sheets and axially adjacent to the compression band to axially compress the plurality of sheets.
    In any embodiment of the generator, it may be advantageous that the generator also has a spacer block between the pair of the plurality of sheets and the compression band spacer has an axial dimension that is greater than the axial dimension of the spacer block.
    [0016] Also comprising a section plate spacer positioned adjacent to the section plate and wherein the compression band spacer has a length greater than that of the section plate spacer. In any embodiment of the generator, it may be advantageous for each sheet to have a first dovetail slot formed therein to receive one of the plurality of wedge bars, and the compression band spacer has a second dovetail slot formed therein receive the one of the plurality of wedge bars, and wherein the second dovetail slot has a cross-sectional area that is smaller than the cross-sectional area of the first dovetail slot.
    In any embodiment of the generator, it may be advantageous that the compression band spacer has an elongated body that extends from a first end containing the second dovetail slot to a second end, extending radially at least substantially along an entire length of an adjacent spacer block between a pair of the plurality of sheets.
    Brief Description of the Drawings These and other features of the disclosure will be more readily understood from the following detailed description of the various aspects of the disclosure when taken in conjunction with the accompanying drawings that illustrate various embodiments of the disclosure, in which:
    1 shows a simplified cross-sectional view of a generator containing a stator in accordance with exemplary embodiments of the disclosure.
    FIG. 2 shows a sectional perspective view of a stator frame of the generator from FIG. 1 in accordance with exemplary embodiments of the disclosure.
    3 shows an enlarged perspective view of a part of the stator containing a compression band spacer according to embodiments of the disclosure.
    4 shows a schematic view of a part of the stator containing the spacer pack in accordance with exemplary embodiments of the disclosure.
    5 shows a side view of part of a stator core sheet containing spacer blocks and a spacer pack in accordance with embodiments of the disclosure.
    6 shows a cross-sectional view of part of a wedge bar in a dovetail slot of the spacer pack and the stator core sheet according to embodiments of the disclosure.
    [0020] It is noted that the drawings of the disclosure are not to scale. The drawings are intended to illustrate only typical aspects of the disclosure and should therefore not be considered to limit the scope of the disclosure. In the drawings, like numbers represent like elements within the drawings.
    Detailed Description of the Invention As stated above, the disclosure provides a spacer pack for a stator core and related stator and generator.
    Referring to the drawings, FIG. 1 shows a simplified cross-sectional view of a generator 100 that can serve as a generator in, for example, a gas and steam power plant system or various other power generation systems. FIG. 2 shows a sectional perspective view of a stator frame 110 that can be used in the generator 100 from FIG. 1. As shown in FIG. 1, the generator 100 includes a stator frame 110 that can be used in the generator 100 of FIG. 1. As shown in FIG. 1, the generator 100 includes a stator frame 110, a rotor 112 having a shaft 14 with an axis of rotation RA, and a stator 116 arranged around the rotor 112. The shaft 114 may be driven to rotate an axis of rotation, for example, by a gas turbine, a steam turbine, a wind turbine, a water turbine, an internal combustion engine, or any other suitable device configured to provide rotating output. The shaft 114 is connected to a substantially cylindrical rotor 112, which may have a wire winding around a magnetic core. The rotor 112 is arranged within the stator 116, which is set up to provide a stationary magnetic field. It is understood that the rotation of the rotor 112 within the stator 114 can generate an electrical current within the wire winding, thereby generating an electrical output from the generator 100.
    The stator 116, having a stator core 122 thereof, is substantially fixedly held within the stator frame 110, which has section plates 124 and a plurality of wedge bars 126 connected to the stator frame 110. As shown in FIGS. 1 and 2, stator frame 110 may include a housing 120 that encloses the rest of the frame. As best shown in FIG. 2, section plates 124 are annular brackets or hollow disc-shaped plates that extend radially and are substantially equally spaced in an axial direction X along a length of stator frame 110. As illustrated, stator frame 110 includes nine section plates 124. In alternative embodiments, frame 110 may include more or fewer section plates 124, such as 3, 5, 7, 10, 15, 20, or more section plates 124.
    As shown in Fig. 2, the wedge bars 126 are fixedly connected to the section plates 124 and extend axially with respect to the axis of rotation X. Wedge bars 126 can be firmly connected, for example using welding, bolts or other known connection systems. In most cases, the wedge bars 126 are evenly spaced around the circumference of the stator frame 110. Referring to FIG. 6, each wedge bar 126 includes an attachment portion 128 for attachment to the section plates 124 and a dovetail 130 (FIG. 6) for attachment to a plurality of stator core sheets 132 of the stator core 122 (FIG. 1) as is common.
    As shown in FIG. 3, a stator 116 may include a stator core 122. Stator core 122 may include a plurality of sheets 132 stacked together to form the core. Groups of sheets can be referred to as core segments. Each sheet 132 includes circumferentially spaced dovetail slots 134 (dashed lines in FIG. 6) that are aligned when stacked for connection to the wedge bars 126. More specifically, each dovetail slot 134 (FIG. 6) may be configured to interlock with a dovetail 130 (FIG. 6) from each wedge bar 126, thereby securing the wedge bars 126 to the panels 132 at locations corresponding to the dovetail slots 134 (FIG. 6) , Alternative embodiments may include more or fewer wedge bars 126, such as 5, 10, 20, 25, 30, 35 or more wedge bars 126. As is understood in the art and as best shown in FIG. 5, groups of sheets 132 may be axially spaced by (inner) spacer blocks 136 that create radially extending vents 138 between sheets 132. Some spacer blocks 136 extend from the radially outer edge 146 of the sheets 132 to stator winding slots 148 in the sheets 132 and other spacer blocks 139 extend from the radially outer edge 146 of the sheets 132 to a radially inner edge 147 of the sheets 132.
    1 to 4, the stator 116 can also have a compression band 140 for radially compressing the wedge bars 126. The compression straps 140 can also be referred to as ring arrangements. As illustrated, compression band 140 extends around wedge bars 126 adjacent to section plate 124. For example, as shown in FIG. 2, compression band 140 may be positioned between a pair of section plates 124. In operation, the compression straps 140 are tensioned to compress the wedge bars 126 to stiffen the connection between the rest of the stator frame 110 and reduce vibration.
    As shown in FIGS. 3 and 4, the stator 116 may optionally also include a section plate spacer pack 142 or section plate spacer packs 142 positioned adjacent to the section plate or sections 124, respectively. While two section plate spacer packs 142 are illustrated, zero, one, or more than two can be used. The section plate spacer pack 142 may include a plurality of sheets (not labeled), for example, of a material that corresponds to the sheets 132, which are typically made of steel, but which may also be made of a different material. As is known in the art, a section plate spacer may be placed between a pair of stator core sheets 132 to axially compress the sheets 132 in the area of section plate (s) 124 to reduce vibration and stiffen the connection to section plate 124 , Spacer packs 142, however, only affect vibrations where section plates 124 are present. Structurally, as shown in dashed lines in FIG. 5, section plate spacer packs 142 extend approximately along half the radial distance of such spacer blocks 136 that extend from the radially outer edge 146 of the sheets 132 to the stator winding slots 148 in the sheets 132. The spacer blocks 136 may be radially aligned with the stator winding slots 148. It is understood that the stator winding slots 148 receive turns that are part of the stator 116. It is noted herein that other spacer blocks 139 may extend from the radially outer edge 146 of the sheets 132 between the stator winding slots 148 to the radially inner edge 147 of the sheets 132. As shown in FIG. 5, the section plate spacer 142 occupies only part of the space of the spacer block 139. As a result, the section plate spacer 142 typically has a substantially trapezoidal shape. The section plate spacer pack 142 may have an axial dimension (in and out of the sheet of FIG. 5) that is greater than the axial dimension of the spacer blocks 136, 139 to provide the axial compressive force on the sheets 132 when they are axially connected to each other in a known manner be clamped, for example using end clamp systems. A close tolerance between the spacer pack 142 and the wedge rod 126 creates a connection stiffness between the stator core 122 and the stator frame 110.
    In accordance with the invention, the stator 116 includes a compression band spacer 150 positioned between a pair of the plurality of sheets 124 and radially within the compression band 140 to axially compress, i.e., in, the plurality of sheets 132 Region of the compression band 140. The compression band spacer 150 thus reduces vibrations on the compression band 140 or the compression bands 140, whereby an additional connection rigidity and a vibration reduction is provided radially along the stator 116. As best shown in FIG. 5, the compression band spacer 150, unlike the section plate spacer 142, includes an elongated body 152 that extends from a first end 154 containing a dovetail slot configured for connection to the dovetail 130 (FIG. 6) of a spline rod 126 156 (see FIG. 6) extends to a second end 158, extending at least substantially radially along an entire length of an adjacent spacer block 136, that is almost to a location on the same radius as the stator winding slots 148. As a result, the vibration distance pack 150 have a substantially triangular shape. Furthermore, as can be seen in FIG. 5, the compression band spacer 150 may have a length that is greater than that of the section plate spacer 142. Although a certain length has been illustrated, it is understood that the compression band spacer 150 may be shorter or longer than and may be shorter or the same length as section plate spacer 142. In either case, compression band spacer 150 has an axial dimension (in / out of the sheet of FIG. 5) that is greater than an axial dimension of spacer blocks 136, 139 µm generate an axial compressive force on the sheets 132 when they are axially clamped together in a known manner. Compression band spacer 150 may be made from a plurality of sheets, for example, from a material such as sheets 132, which are typically made of steel. The number of sheets in pack 150 may depend on a length of spacer blocks 136. As also shown in FIG. 5, compression band spacer 150 includes a pair of opposite sides 160, 162 that are configured to form a ventilation space 164 between each of the opposite sides 160, 162 and an adjacent spacer block 136 (as on both sides is illustrated). In this manner, use of the compression band spacer 150 does not interfere with the ventilation typically provided by the spacer blocks 136, 139.
    Referring to FIG. 4, the compression band spacers 150 are located as close as possible to the section plates 124 and the compression bands are arranged close to the compression band spacers 150. In one embodiment, one or more compression band spacers 150B may be radially aligned with an axial end 170 of a respective compression band 140B. However, this is not necessary and a compression band spacer pack, for example 150A, can be located anywhere radially within the compression band, for example 140A. In the example shown, a first compression band 140A extends around the wedge bars 126 adjacent to a first axial side A of the section plate 124 and a second compression band 140B extends around the wedge bars 126 adjacent to an opposite, second axial side B of the section plate 124. In this case, a first compression band spacer 150A radially within the first compression band 140A and a second compression band spacer 150B may be positioned radially within the second compression band 140B. The compression band spacer packs 140A, 140B may be positioned in substantially equal relative positions relative to the respective compression bands 140A, 140B to balance the axial compression around the section plate 124. For example, the compression band spacer packs 150A, 150B may be radially aligned with an axial end 170 of the respective compression band 140A and 140B, respectively, which is closest to the section plate 124, which may provide balanced axial compression around the section plate 124 (the pack would be 150A in this case further to the right than illustrated). However, as illustrated, the same positioning is not required in all cases.
    Referring to Figure 6, as described herein, each stator core 132 includes a dovetail slot 134 formed therein to receive one of the plurality of wedge bars 126, that is, a dovetail 130 thereof. In addition, as described herein, compression band spacer 150 includes a dovetail slot 156 formed therein to receive one of the plurality of wedge bars (dovetail 130). In addition, the dovetail slot 156 of the compression band spacer 150 has a cross-sectional area that is smaller than the cross-sectional area of the dovetail slot 134 of the stator core sheets 132 to provide additional vibration reduction and / or stiffness of the stator 116. In one example, a gap C C bs P of the dovetail slot 156 with the dovetail 130 may be much smaller than a gap Ci am of the dovetail slot 134 of the sheets 132, for example approximately 15% of the gap Ci am . For example, the gap C cb s P may be about 0.005 cm and the gap C | am can be approximately 0.03 cm. Other gap widths can also be possible depending on the size of the stator 116.
    In operation, when the straps 140 are tensioned, they press the wedge bars 126 radially inward against the compression strap spacer packs 150 and create a stronger connection between the spacer pack and the wedge bar. The arrangement also results in a stiffer, i.e. less vibrating connection between the stator core 122 and the stator frame 110, i.e. the section plates 124, etc., when the compression tape spacer packs 150 are held within the stator core 122 with pressure and the wedge bars 126 with the section plates 124 are connected. This solution, using compression band spacers 150 and compression bands 140, creates a controlled connection stiffness and helps maintain stiffness over the life of generator 100.
    The terms used herein are for the purpose of describing specific embodiments only and are not intended to limit the disclosure. As used herein, the singular forms "a", "an", and "the / the" are intended to include the plural forms, unless the context clearly indicates otherwise. It will also be understood that the terms "having" and "having" when used in this specification indicate the presence of the features, numbers, steps, operations, elements and / or components specified, but not the presence or addition exclude from one or more further characteristics, numbers, steps, operations, elements, components and / or groups thereof. The corresponding structures, materials, actions, and equivalents of all middle or step-plus-function elements in the claims that follow are intended to include any structure, material, or action to function in combination with other claimed elements to perform as it is claimed more precisely. The description of the present disclosure has been presented for purposes of illustration and description, but is not intended to be exhaustive or limited to the disclosure in the manner disclosed. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the disclosure. The embodiment was selected and described to best explain the principles of the disclosure and its practical application, and to enable other persons of ordinary skill in the art to understand the disclosure for various embodiments with various modifications as are suited to the specific use contemplated.
    Reference symbol list [0034]
    100 generator 110 stator 112 rotor 114 wave 116 stator 120 casing 122 stator core 124 section plates 126 key bars 128 attachment section 130 dovetail 132 sheets 134, 156 dovetail slots 136, 139 spacer blocks 138 ventilations 140 compression band 140A First compression band 140B Second compression band 142 Section plate distance Pack
    146 Radially outer edge 147 Radially inner edge 148 Staterwicksschlitzes 150 Compression band distance Pack 150A First compression band spacer 150B Second compression band spacer 152 Elongated body 154 First end 158 Second end 160, 162 Opposite sides 164 ventilation space 170 Axial end
    权利要求:
    Claims (9)
    [1]
    claims
    A stator (116) for a generator (100), the stator comprising: a stator frame containing a section plate (124) and a plurality of wedge bars (126) connected to the section plate, each wedge bar having a dovetail;
    a compression band (140) for radially compressing the wedge bars, the compression band (140) extending around the plurality of wedge bars (126) adjacent to the section plate;
    a stator core (122) containing a plurality of sheets (132) connected to the plurality of wedge bars (126); and a compression band spacer (150) positioned between a pair of the plurality of sheets (152) and axially adjacent to the compression band (140) to axially compress the plurality of sheets (132).
    [2]
    2. The stator (116) of claim 1, further comprising a spacer block (136, 139) between the pair of the plurality of sheets (132), and wherein the compression band spacer pack (150) has an axial dimension that is greater than the axial dimension of the spacer block (136, 139).
    [3]
    The stator (116) of claim 1 or 2, further comprising a section plate spacer pack (142) positioned adjacent to the section plate (124).
    [4]
    4. The stator (116) of claim 2 or 3, wherein the compression band spacer (150) has a pair of opposite sides configured to form a ventilation space (164) between each opposite side and an adjacent spacer block (136, 139).
    [5]
    5. The stator according to any one of the preceding claims, wherein each sheet (132) has a first dovetail slot (134) formed therein for receiving one of the plurality of wedge bars (126) and wherein the compression band spacer pack (150) has a second dovetail slot (156) formed therein. for receiving one of the plurality of wedge bars and wherein the second dovetail slot (156) has a cross-sectional area that is smaller than the cross-sectional area of the first dovetail slot (134).
    [6]
    The stator (116) of claim 5, wherein the compression band spacer pack (150) includes an elongated body that extends from a first end (154) containing the second dovetail slot (156) to a second end (158), extending radially at least substantially along an entire length of an adjacent spacer block (136, 139) between a pair of the plurality of sheets (132).
    [7]
    7. The stator (116) according to one of the preceding claims, wherein the compression band spacer (150) is positioned radially inside the compression band (140) and / or wherein the compression band spacer has a plurality of layers.
    [8]
    8. The stator (116) according to any one of the preceding claims, wherein the compression band (140) comprises:
    a first compression band (140A) extending around the plurality of wedge bars adjacent a first axial side of the section plate (124) to radially compress the wedge bars (126) and a second compression band (140B) extending around the plurality of Wedge bars extending adjacent an opposite, second axial side of the section plate to radially compress the wedge bars; and wherein the compression band spacer includes: a first compression band spacer (150A) located radially within the first
    Compression band is arranged and a second compression band spacer (150B), which is arranged radially inside the second compression band.
    [9]
    9. Generator (100) comprising:
    a rotor (112) with an axis of rotation;
    a stator (116) disposed around the rotor, the stator comprising:
    a stator frame (110) including a section plate (124) and a plurality of wedge bars (126) connected to the section plate, each wedge bar including a dovetail (130);
    a compression band (140) for radially compressing the wedge bars, the compression band extending around the plurality of wedge bars adjacent the section plate;
    a stator core (122) containing a plurality of sheets (132) connected to the plurality of wedge bars; and a compression band spacer (150) positioned between a pair of the plurality of sheets and axially adjacent to the compression band to axially compress the plurality of sheets.

    126
    120
    X



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    FR3077691B1|2018-02-02|2020-02-28|Ge Energy Power Conversion Technology Limited|MAGNETIC CIRCUIT FOR ROTARY ELECTRIC MACHINE ELEMENT, METHOD AND ELECTRIC MACHINE THEREFOR|US9673668B2|2014-09-18|2017-06-06|General Electric Company|Compression band shim pack for stator core, related stator and generator|
    ES2645662T3|2015-03-16|2017-12-07|Abb Schweiz Ag|Electric machine|
    DE102017206873A1|2017-04-24|2018-10-25|Siemens Wind Power A/S|Support structure segment for a generator of a wind turbine|
    CN110460179A|2019-08-13|2019-11-15|江苏中车电机有限公司|A kind of motor welding ventilation channel plate|
    法律状态:
    2016-10-31| PK| Correction|Free format text: BERICHTIGUNG ERFINDER. |
    2017-03-15| NV| New agent|Representative=s name: GENERAL ELECTRIC TECHNOLOGY GMBH GLOBAL PATENT, CH |
    2019-03-29| AZW| Rejection (application)|
    2019-05-31| NV| New agent|Representative=s name: FREIGUTPARTNERS IP LAW FIRM DR. ROLF DITTMANN, CH |
    2020-05-29| AEN| Modification of the scope of the patent|Free format text: :DIE PATENTANMELDUNG IST AUFGRUND DES WEITERBEHANDLUNGSANTRAGS VOM 20.05.2019 REAKTIVIERT WORDEN. |
    2021-04-30| PL| Patent ceased|
    优先权:
    申请号 | 申请日 | 专利标题
    US14/490,266|US9673668B2|2014-09-18|2014-09-18|Compression band shim pack for stator core, related stator and generator|
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