• 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 method for producing a stepping motor. The stepping motor includes a rotor having a permanent magnet with two poles, a one-piece plate-shaped stator (3) having a rotor bore into which the rotor is inserted and which is magnetically coupled to the rotor, and a coil fixed to the stator. The rotor bore has on its periphery a structure (5) for generating a cogging torque. The stator (3) comprises a cogging torque range (3a), which includes the structure for generating the cogging torque, and a yoke portion, which excludes the cogging torque range. The cogging torque range (3a), which is thinner than the thickness of the yoke portion, is located in the middle in the thickness direction of the yoke portion. In the stepping motor, the rotor bore is produced by pressing a stator element (31), and the cogging torque region (3a) is generated by milling the stator element (31) with a milling machine.
    公开号:CH712707B1
    申请号:CH01264/17
    申请日:2016-02-15
    公开日:2018-07-31
    发明作者:Miyauchi Norio
    申请人:Miyauchi Norio；
    IPC主号:
    专利说明:

    description
    Technical Field The present invention relates to a method of manufacturing a rotor bore in a stator of a stepping motor.
    Background Art First, the structure of a conventional stepping motor will be described.
    Fig. 5 (a) is a plan view of a first stepping motor according to the prior art, and Fig. 5 (b) is an A-A sectional view thereof. In the plan view of Fig. 5 (a), the first stepping motor 15 according to the prior art comprises: a rotor 2 including a permanent magnet 2a having two poles; a one-piece plate-shaped stator 35 provided with a structure 5 including stepped portions 5a and 5b for generating a cogging torque in a periphery of a rotor bore 2b into which the rotor 2 is inserted, magnetically coupled to the stator 35 the rotor 2; and a coil 4 which is fixed to the stator 35. In addition, the stator 35 includes a cogging torque region 35a which includes the cogging torque generating structure 5 and has a periphery in the form of a true circle 6c indicated by dashed lines and a yoke portion 35b which defines the cogging torque region 35a excludes.
    Further, in the AA sectional view of Fig. 5 (b), the cogging torque region 35a is located at the center in the direction of the thickness t of the yoke portion 35b, and the thickness t0 of the cogging torque region is thinner as the thickness t of the yoke area. The stator 35 is formed such that a stator element 75 having a thickness t0 and having a cogging torque range 35 is clamped between stator elements 74 and 76 in the thickness direction, which have a thickness t1 and which are not the cogging torque range 35a have.
    Figs. 7 (a-1) to 7 (c) show a method of manufacturing the rotor bore in the stator of the first stepping motor according to the prior art. Using the Figs. 7 (a-1) to 7 (c), the method of manufacturing the rotor bore in the stator of the first stepping motor according to the prior art will be described. A rectangular stator element 71 and a rectangular stator element 73 having a thickness t1 shown in FIGS. 7 (a-1) and 7 (a-3) and a rectangular stator element 72 having a thickness t0 shown in FIG. a-2), are prepared. The stator elements 71 and 73 shown in Figs. 7 (a-1) and 7 (a-3) were pressed to form the stator holes in the shape of true circles 6c, thereby forming the stator elements 74 and 76 as shown in Figs. 7 (b-1) and 7 (b-3). The rectangular stator member 72 having the thickness t0 shown in Fig. 7 (a-2) was pressed to form the cogging torque generating structure 5 having stepped portions 5a and 5b, thereby producing a stator member 75 such as shown in Fig. 7 (b-2). Thereafter, as shown in Fig. 7 (c), the stator element 75 is clamped between the stator elements 74 and 76, whereby a stator 35 is generated.
    Fig. 6 (a) is a plan view of a second stepping motor according to the prior art, and Fig. 6 (b) is a B-B sectional view thereof. In the plan view of Fig. 6 (a), the second stepping motor 16 according to the prior art comprises: a rotor 2 including a permanent magnet 2a having two poles; a one-piece plate-shaped stator 36 provided with a structure 15 including grooves 15a and 15b for generating a cogging torque in a periphery of a rotor bore 2c into which the rotor 2 is inserted, with the stator 36 magnetically coupled to the rotor Rotor 2; and a coil 4 which is fixed to the stator 36. In addition, the stator 36 includes a cogging region 36a which includes the cogging torque generating structure 15 and a real circle 16c periphery, as indicated by dashed lines, and a yoke portion 36b which excludes the cogging torque region 36a.
    Further, in the BB sectional view of Fig. 6 (b), the cogging torque region 36a is located at the center in the direction of the thickness t of the yoke portion 36b, and the thickness t0 of the cogging torque region is thinner as the thickness t of the yoke area. The stator 36 is formed such that a stator element 85 having a thickness t0 and having a cogging torque range 36 is clamped between stator elements 84 and 86 in the thickness direction, which have a thickness t1 and which are not the cogging torque range 36a have.
    Figs. 8 (a-1) to 8 (c) show a method of manufacturing the rotor bore in the stator of the second stepping motor according to the prior art. With the use of Figs. 8 (a-1) to 8 (c), the method of manufacturing the rotor bore in the stator of the first stepping motor according to the prior art will be described. A rectangular stator element 81 and a rectangular stator element 83 having a thickness t1 shown in FIGS. 8 (a-1) and 8 (a-3) and a rectangular stator element 82 having a thickness t0 shown in FIG. a-2), are prepared. The stator elements 81 and 83 shown in Figs. 8 (a-1) and 8 (a-3) were pressed to form the stator holes in the form of true circles 16c, thereby forming the stator elements 84 and 86 as shown in Figs. 8 (b-1) and 8 (b-3). The rectangular stator member 82 having the thickness t0 shown in FIG. 8 (a-2) was pressed to form the cogging torque generating structure 15 having the grooves 15a and 15b, thereby producing a stator member 85 such as FIG shown in Fig. 8 (b-2). Thereafter, as shown in Fig. 8 (c), the stator element 85 is clamped between the stator elements 84 and 86, whereby a stator 36 is generated.
    State of the art, documents
    Patent, Documents: [0009]
    Patent, Document 1: JP-1998-028 367-A Patent, Document 2: JP-2001-178107-A
    Summary of the invention
    Problems to be Solved by the Invention However, the methods of manufacturing the rotor bore in the stators of the first and second stepping motors according to the prior art have two problems.
    One of the problems is that two raw materials with different thicknesses have to be prepared, which leads to an increase in material costs.
    Another problem is that during the clamping of the stator 75 between the stator elements 74 and 76, a positional deviation is generated with respect to the plan view between the true circles 6c and the cogging torque generating structure 5, and a dispersion of the cogging torque of the stepping motor is generated becomes. Alternatively, during the clamping of the stator element 85 between the stator elements 84 and 86, a positional deviation is generated with respect to the plan view between the true circles 16c and the cogging torque generating structure 15, and a dispersion of the cogging torque of the stepping motor is generated.
    Means for Solving the Problems In a stepping motor comprising a rotor including a permanent magnet having two poles, a one-piece plate-shaped stator having a rotor bore into which the rotor is inserted and which is magnetically coupled to the rotor, and a The stator comprises a cogging torque region which includes the structure for generating the cogging torque and a yoke region which excludes the cogging torque region, wherein the stator has a coil mounted on the stator, wherein the rotor bore has a structure for generating a cogging torque on its periphery the cogging torque range is thinner than the thickness of the yoke portion and disposed in a center in a thickness direction of the yoke portion, wherein the rotor bore is formed by pressing a stator member, and the cogging torque range by milling the stator member with a Milling machine is shaped.
    The rotor bore is formed by pressing the stator element, then one side of the cogging torque range in the thickness direction is formed by milling the stator element from one side, and then another side of the cogging torque range in the thickness direction by milling the stator element formed from the other side, or alternatively, one side of the cogging torque range in the thickness direction is formed by milling the stator element from one side, then the rotor bore is formed by pressing the stator element, and then another side of the cogging torque range formed in the thickness direction by milling the stator element from the other side.
    EFFECT OF THE INVENTION Since raw materials having the same thickness are processed, an effect can be achieved in which material costs can be reduced. In addition, in the method of manufacturing the rotor bore in the stator of the present invention, the true circles and the structure for generating the cogging torque are made by a series of preparations of the stator element, so that the dispersion of the cogging torque of the stepping motor can be suppressed, and an effect can be obtained in which a high-performance stepping motor can be manufactured stably.
    Brief Description of the Figures [0016]
    FIG. 1 (a) is a plan view of a first stepping motor according to the present invention, and FIG
    Fig. 1 (b) is an A-A sectional view thereof.
    FIG. 2 (a) is a plan view of a second stepping motor according to the present invention, and FIG
    Fig. 2 (b) is a B-B sectional view thereof.
    3 (a) to 3 (d) show a first method of manufacturing a rotor bore in a stator of the first stepping motor according to the present invention.
    4 (a) to 4 (d) show a first method of manufacturing a rotor bore in a stator of the second stepping motor according to the present invention.
    Fig. 5 (a) is a plan view of a first stepping motor according to the prior art, and Fig. 5 (b) is an A-A sectional view thereof.
    Fig. 6 (a) is a plan view of a second stepping motor according to the prior art, and Fig. 6 (b) is a B-B sectional view thereof.
    Figs. 7 (a-1) to 7 (c) show a method of manufacturing a rotor bore in a stator of a first stepping motor according to the prior art.
    Figs. 8 (a-1) to 8 (c) show a method of manufacturing a rotor bore in a stator of a second stepping motor according to the prior art.
    Figs. 9 (a) to 9 (d) show a second method of manufacturing a rotor bore in a stator of the first stepping motor according to the present invention.
    10 (a) to 10 (d) show a second method of manufacturing a rotor bore in a stator of a second stepping motor according to the present invention.
    Embodiments of the Invention Embodiments of the present invention will be described below in detail with reference to the drawings.
    Embodiment 1 Fig. 1 (a) is a plan view of a first stepping motor according to the present invention, and Fig. 1 (b) is an A-A sectional view thereof. The first stepping motor 1 according to the present invention comprises: a rotor 2 including a permanent magnet 2a having two poles; an integral plate-shaped stator 3 which is provided with a structure 5 including stepped portions 5a and 5b for generating a cogging torque in a periphery of a rotor bore 2b into which the rotor 2 is inserted, with the stator 3 magnetically connected to the rotor 2 coupled; and a coil 4 which is fixed to the stator 3. The stator 3 comprises a cogging torque region 3a, which includes the structure 5 for generating the cogging torque, and a yoke region 3b, which excludes the cogging torque region 3a. Further, as shown in the AA sectional view of Fig. 1 (b), the cogging torque region 3a is located at the center in the direction of the thickness t of the yoke portion 3b, and the thickness t0 of the cogging torque region 3a is thinner than the thickness t of the yoke portion 3b.
    With the use of a first method for producing a rotor bore in a stator of a first stepping motor according to the present invention, as shown in Figs. 3 (a) to 3 (d), the first method for producing the rotor bore in the stator of the first stepping motor according to the present invention. A stator member 31 shown in Fig. 3 (a) is pressed to form the rotor bore, thereby producing a stator member 32 having a cogging torque generating structure 5 having stepped portions 5a and 5b, as shown in Figs of Fig. 3 (b). Subsequently, as shown in Fig. 3 (c), the stator element 32 is milled with a milling machine from one side in its thickness direction to form a true circle 6c having a depth t1, thereby producing a stator element 33. Subsequently, the stator element 33 is milled with the milling machine from another side in its thickness direction to form a true circle 6c having a depth t1, thereby producing a stator 3 shown in Fig. 3 (d).
    With the use of a second method for producing a rotor bore in a stator of the first stepping motor according to the present invention, shown in Figs. 9 (a) to 9 (d), the second method for producing the rotor bore in the stator of first stepping motor according to the present invention described. A stator element 91 shown in Fig. 9 (a) is milled with a milling machine from one side in its thickness direction to form a true circle 6c having a depth t1, thereby forming a stator element shown in Fig. 9 (b) 92 is produced. Subsequently, as shown in Fig. 9 (c), pressing is performed to form the rotor bore, thereby producing a stator element 93 having a cogging torque generating structure 5 having stepped portions 5a and 5b. The stator element 33 is milled with the milling machine from another side in its thickness direction to form a true circle 6c having a depth t1, thereby producing a stator 3 shown in Fig. 9 (d).
    Embodiment 2 Fig. 2 (a) is a plan view of a second stepping motor according to the present invention, and Fig. 2 (b) is a B-B sectional view thereof. The second stepping motor 11 according to the present invention comprises: a rotor 2 including a permanent magnet 2a having two poles; an integral plate-shaped stator 13 provided with a structure 15 including stepped portions 15a and 15b for generating a cogging torque in a periphery of a rotor bore 2c into which the rotor 2 is inserted magnetically with the stator 13;
    coupled to the rotor 2; and a coil 4 which is fixed to the stator 3. The stator 13 includes a cogging torque region 13a including the cogging torque generating structure 15 and a yoke region 13b excluding the cogging torque region 13a. Further, as shown in the BB sectional view of Fig. 2 (b), the cogging torque range 13a is located at the center in the thickness direction of the yoke portion 13b, and the thickness t0 of the cogging torque portion 13a is thinner than the thickness t of the yoke area 13b.
    With the use of a first method for producing a rotor bore in a stator of a second stepping motor according to the present invention, as shown in Figs. 4 (a) to 4 (d), the first method for producing the rotor bore in the stator of the second stepping motor according to the present invention. A stator member 41 shown in Fig. 4 (a) is pressed to form the rotor bore, thereby producing a stator member 42 having a cogging torque generating structure 15 having grooves 15a and 15b as shown in Figs Fig. 4 (b). Subsequently, as shown in Fig. 4 (c), the stator element 42 is milled with a milling machine from one side in its thickness direction to form a true circle 16c having a depth t1, thereby producing a stator element 43. Subsequently, the stator element 43 is milled with the milling machine from another side in its thickness direction to form a true circle 16c having a depth t1, whereby a stator 13 is manufactured.
    With the use of a second method for producing a rotor bore in a stator of the second stepping motor according to the present invention, shown in Figs. 10 (a) to 10 (d), the second method for producing the rotor bore in the stator of second stepping motor according to the present invention described. A stator element 101 shown in Fig. 10 (a) is milled with a milling machine from one side in its thickness direction to form a true circle 16c having a depth t1, thereby forming a stator element shown in Fig. 10 (b) 102 is produced. Subsequently, the stator member 102 is pressed to form the rotor bore, thereby producing a stator member 103 having a cogging torque generating structure 15 having grooves 15a and 15b as shown in Fig. 10 (c). Subsequently, the stator element 103 is milled with the milling machine from another side in its thickness direction to form a true circle 16c having a depth t1, thereby producing a stator 13 shown in Fig. 10 (d).
    In the case where the thickness t of the stator element in the method of manufacturing the rotor bore in the stator of the first stepping motor according to the present invention shown in Figs. 1 (a) and 1 (b) and in the stator of the second stepping motor According to the present invention shown in Figs. 2 (a) and 2 (b), 500 microns and the thickness tO of the cogging torque range is 50 microns, has the manufacturing method in which the stator element with a milling machine from both sides in the thickness direction of the stator is milled to produce true circles and to reduce the thickness tO of the cogging torque range to 50 microns and is then punched to produce the structure for generating the cogging torque, the following problem. Since the thickness t0 of the cogging torque range is as thin as 50 micrometers, the cogging torque range in the pressing direction would be bent by a punching force in the thickness direction at the time of pressing. Therefore, this manufacturing method can not be used to make the rotor bore in the stator.
    In a method of manufacturing the rotor bore in the stator of the first stepping motor according to the present invention shown in Figs. 1 (a) and 1 (b), and in the stator of the second stepping motor according to the present invention shown in Figs 2 (a) and 2 (b), the true circles at the depth t1 and the structure for generating the cogging torque can all be generated by milling with a milling machine. However, a considerable manufacturing time is required by milling with the milling machine, in particular for producing the stepped areas or the grooves for generating the cogging torque. Therefore, this manufacturing method can not serve as a manufacturing method used in mass production. Moreover, although the stepped portions or grooves for generating the cogging torque may be produced by wire eroding, this manufacturing method requires a considerable manufacturing time and therefore can not be used as a production method in mass production.
    Industrial Applicability As shown by the above description, according to the method of manufacturing a rotor bore in a stator of a stepping motor of the present invention, the material cost of the stator element can be reduced as compared with the conventional method of manufacturing a rotor bore in a stator of a stepping motor ,
    Furthermore, a scattering of the cogging torque, which is an important function of a stepping motor, can be avoided. Accordingly, the method of manufacturing a rotor bore in a stator of the present invention is applicable as a method of manufacturing a rotor bore in a stator of a stepping motor.
    权利要求:
    Claims (2)
    [1]



    claims
    A method of manufacturing a stepping motor (1) comprising a rotor (2) including a permanent magnet (2a) having two poles, a one-piece plate-shaped stator (3) having a rotor bore (2b) into which the rotor (2) is inserted and which is magnetically coupled to the rotor (2), and a coil (4) fixed to the stator (3), wherein the rotor bore (2b) has on its periphery a structure (5) for generating a cogging torque has, wherein the stator (3) comprises a cogging torque range (3a) for generating the cogging torque and a yoke portion (3b), which excludes the cogging torque range (3a), wherein the cogging torque range (3a) thinner than that Thickness of the yoke portion (3b) is located at a center in a thickness direction of the yoke portion (3b), the rotor bore (2b) being generated by pressing a stator member (31), and the cogging torque portion (3a ) by milling the stator element (31) with a milling machine will be.
    [2]
    2. A method of manufacturing the stepping motor (1) according to claim 1, wherein: the rotor bore (2b) is generated by the pressing of the stator element (31); thereafter, a side in the thickness direction of the cogging torque region (3a) is produced by milling the stator element (31) from the one side; and then another side in the thickness direction of the cogging torque region (3a) is produced by milling the stator element (31) from the other side, or wherein: one side in the thickness direction of the cogging torque region (3a) is machined by milling the stator element (91 ) is generated from one side; Thereafter, the rotor bore (2b) is produced by pressing the stator element (91); and then another side in the thickness direction of the cogging torque range (3a) is produced by milling the stator element (91) from the other side.
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    同族专利:
    公开号 | 公开日
    JP5854448B1|2016-02-09|
    JP2017046393A|2017-03-02|
    WO2017033347A1|2017-03-02|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    JPS604660B2|1974-11-14|1985-02-05|Seikoo Denshi Kogyo Kk|
    JPS52147713A|1976-06-04|1977-12-08|Citizen Watch Co Ltd|Stepping motor|
    US4491751A|1981-04-09|1985-01-01|Moskovsky Energetichesky Institut|Single-phase step motor|
    JPS57180366A|1981-04-30|1982-11-06|Citizen Watch Co Ltd|Yoke for step motor of timepiece and manufacture thereof|
    JPS60170430A|1984-02-10|1985-09-03|Citizen Watch Co Ltd|Constrution of stator for step motor for timepiece|
    JPH0624421B2|1985-07-26|1994-03-30|シチズン時計株式会社|Yoke manufacturing method|
    JPS62181660A|1986-02-04|1987-08-10|Casio Comput Co Ltd|Stepping motor|
    JP3628442B2|1996-07-08|2005-03-09|シチズン時計株式会社|Step motor|
    JPH10204535A|1997-01-21|1998-08-04|Denso Corp|Production of steel parts|
    JP4391646B2|1999-12-16|2009-12-24|シチズンホールディングス株式会社|Step motor|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    JP2015165471A|JP5854448B1|2015-08-25|2015-08-25|Step motor processing method|
    PCT/JP2016/000760|WO2017033347A1|2015-08-25|2016-02-15|Method for fabricating stepping motor|
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