WO2017099002A1 - 回転電機 - Google Patents

回転電機 Download PDF

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Publication number
WO2017099002A1
WO2017099002A1 PCT/JP2016/085838 JP2016085838W WO2017099002A1 WO 2017099002 A1 WO2017099002 A1 WO 2017099002A1 JP 2016085838 W JP2016085838 W JP 2016085838W WO 2017099002 A1 WO2017099002 A1 WO 2017099002A1
Authority
WO
WIPO (PCT)
Prior art keywords
cogging torque
groove
stator core
distance
rotor
Prior art date
Application number
PCT/JP2016/085838
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
智仁 中野
一農 田子
金澤　宏至
Original Assignee
日立オートモティブシステムズエンジニアリング株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 日立オートモティブシステムズエンジニアリング株式会社 filed Critical 日立オートモティブシステムズエンジニアリング株式会社
Publication of WO2017099002A1 publication Critical patent/WO2017099002A1/ja

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/14—Stator cores with salient poles

Definitions

  • the present invention relates to a rotating electrical machine.
  • Patent Document 1 As a method for reducing the cogging torque, Patent Document 1, Patent Document 2, and the like describe a structure in which grooves or protrusions are provided on the surface of the teeth of the stator.
  • Patent Document 1 finds that the phase of the cogging torque can be reversed by adjusting the width of the groove provided at the tip of the tooth, and two types of stator cores having different groove widths and cogging torques having opposite phases to each other. Are combined in the direction of the rotation axis to cancel the cogging torque.
  • the width of the auxiliary groove is different from the ideal value due to a shape error or the like, the cogging torque can be reduced by adjusting the lamination ratio without changing the shape of the stator core.
  • Patent Document 1 it is necessary to provide a groove having a wide width in order to reverse the cogging torque, which causes a problem that the amount of magnetic flux incident on the coil is reduced and the torque during energization is reduced.
  • the phase of the cogging torque is reversed by adjusting the depth, not the width of the groove, and the stator cores whose cogging torque is opposite to each other are combined in the direction of the rotation axis.
  • the cogging torque is reduced while suppressing the decrease in torque.
  • the present invention for solving the above-mentioned problems includes a stator core around which a winding is wound and a rotor that generates a magnetic field, and the stator core has a rotating shaft of the rotor on a surface on which magnetic flux is incident.
  • a first surface whose distance from the first distance is a first surface and a second surface which is a second distance which is different from the first distance, and the difference between the distances of the first surface and the second surface
  • the second surface is formed such that the amplitude of the cogging torque generated by being provided is in the first range including the extreme value, and the phase is opposite to the phase of the cogging torque and includes the extreme value of the amplitude of the cogging torque.
  • a rotary electric machine is characterized in that a groove having a depth formed to be in the second range is provided.
  • the rotating electrical machine of the present invention reverses the phase of the cogging torque by adjusting the groove depth instead of the groove width, the cogging torque can be adjusted without widening the groove width, and the cogging torque can be reduced while suppressing a decrease in torque. It is possible to reduce. Further, by setting the depth of the groove to a value at which the amplitude of the cogging torque takes an extreme value, variation in the cogging torque due to the shape error can be reduced. Problems, configurations, and effects other than those described above will be clarified by the following description of the embodiments.
  • Sectional drawing of the rotary electric machine which concerns on Example 1 of this invention The perspective view which shows typically a part of stator iron core which concerns on Example 1 of this invention. Sectional drawing of a part of stator core which concerns on Example 1 of this invention. Sectional drawing of a part of stator core which concerns on Example 1 of this invention. The figure which shows the relationship between the depth of the groove
  • Sectional drawing of a part of stator core concerning Example 2 of the present invention The figure which shows the relationship between the depth of the groove
  • the first embodiment includes a stator core around which a winding is wound and a rotor that generates a magnetic field.
  • the stator core has a first distance on the surface on which the magnetic flux is incident from the rotor rotation axis.
  • a cogging torque amplitude generated by providing a difference in distance between the first surface and the second surface, and a second surface having a second distance that is a distance different from the first distance.
  • the second surface is formed so as to be in the first range including the extreme value, and the phase of the cogging torque generated by providing the difference in the distance between the first surface and the second surface is opposite to the phase
  • the rotary electric machine is characterized in that a groove having a depth formed so as to be in the second range including the extreme value of the amplitude of the cogging torque is provided.
  • FIG. 1 is a cross-sectional view of a rotating electrical machine according to Embodiment 1 of the present invention.
  • the rotating electrical machine 1 includes a stator 20 formed by laminating a plurality of thin stator cores 10 and a plurality of laminar rotor cores 30, and a permanent magnet 40 is disposed. And a rotor 50 formed as described above.
  • a plurality of teeth 60 and slots 70 for winding the windings are provided at equal intervals in the circumferential direction. In FIG. 1, the winding is not shown.
  • FIG. 2 is a perspective view schematically showing a part of the stator core 10 according to the first embodiment of the present invention
  • FIGS. 3A and 3B are cross-sectional views of the stator core A and the stator core B.
  • FIG. The stator core 10 has a first surface 80 and a second surface 90 that are opposed surfaces with a predetermined gap between the stator 60 and the rotor 50 on the tip side of the teeth 60.
  • the first surface 80 is a surface on which magnetic flux is incident, and is provided such that the distance from the rotating shaft 51 of the rotor 50 is the first distance L1.
  • the second surface 90 is provided such that the distance of the rotor 50 from the rotation shaft 51 is a second distance L2 that is a distance different from the first distance.
  • the second distance L2 is set to be longer than the first distance L1 (L1 ⁇ L2), and the second surface 90 enters the teeth 60 rather than the first surface 80. It is arranged at the position. That is, the second surface 90 is formed by providing a groove in the first surface 80.
  • the second surface 90 is constituted by a bottom surface of a shallow groove provided in the first surface 80. The shallow groove is shallower than the groove 100.
  • the stator core 10 has a stator 91 having a groove 91 formed by providing, on a part of the first surface 80, a second surface 90 that is farther from the rotation shaft 51 of the rotor 50 than the first surface 80. It is formed by laminating an iron core A and a stator iron core B having a groove 100 formed by providing a bottom surface 101 farther from the rotation shaft 51 than the second surface 90 in the rotation axis direction. .
  • the second surface 90 and the groove 100 are provided at the center in the circumferential direction of the first surface 80.
  • the bottom surface 101 of the groove 100 is disposed at a position farther from the rotation shaft 51 of the rotor 50 than the second surface 90. That is, the bottom surface 101 and the second surface 90 of the groove 100 have different depths from the first surface 80 in the axial direction of the rotation axis, and the bottom surface 101 of the groove 100 is deeper than the second surface 90. Yes.
  • the depths of the grooves 91 and 100 formed in the stator core A and the stator core B are Da and Db, respectively.
  • the groove widths of the two stator cores 91 and 100 are the same, but may be different.
  • the ratio between the number of magnetic poles M of the rotor 50 (M is a natural number) and the number of slots N of the stator 20 (N is a natural number) is 2: 3.
  • the structure can also be applied to rotating electrical machines with different ratios.
  • the cogging torque is often dominated by a component that pulsates L times per rotation of the rotor 50 (L-order component).
  • FIG. 4 is a diagram showing the relationship between the groove depth and the amplitude of the cogging torque L-order component.
  • the vertical axis represents the amplitude of the cogging torque L-order component
  • the horizontal axis represents the groove depth.
  • the signs of the amplitudes are different, it indicates that the phases are mutually inverted.
  • the groove depth In the vicinity of the groove depth D0 where the L-order component is 0, the groove depth is highly sensitive to the cogging torque (the change in the cogging torque with respect to the change in the groove depth is large). It is considered that the cogging torque of the product varies due to the influence of a minute dimensional error. Therefore, it is considered to adjust the groove depth so that the sensitivity to the cogging torque is lowered.
  • the amplitude of the cogging torque can be adjusted by providing a difference (L2 ⁇ L1) in the distance from the rotating shaft 51 of the rotor 50 between the first surface 80 and the second surface 90.
  • the second surface 90 provided on the stator core A is formed at a position that becomes the first range Ds1 including the extreme value D1 of the amplitude of the cogging torque.
  • the groove 100 provided in the stator core B has a phase opposite to the phase of the cogging torque of the stator core A, and the second range Ds2 including the extreme value D2 of the amplitude of the cogging torque
  • the depth is set.
  • the vertical axis represents the cogging torque
  • the horizontal axis represents the electrical angle
  • the cogging torque is dominant in the L-order component and has a large amplitude in the conventional structure in which no groove is provided on the opposing surface, but in the first embodiment, the L-order component is canceled out. Cogging torque has been reduced.
  • Example 2 In the first embodiment, it is assumed that the groove is provided by setting the distance L2 from the rotation axis 51 of the second surface 90 to be greater than the distance L1 of the first surface 80. However, in the second embodiment, the second surface 90 is provided. A case where the protrusion is provided by making the distance L2 from the rotation shaft 51 closer to the distance L1 from the rotation shaft 51 of the first surface 80 will be described.
  • FIG. 6 is a perspective view schematically showing a part of the stator core 10 of the second embodiment
  • FIGS. 7A and 7B are cross-sectional views of the stator core C and the stator core D.
  • the first distance L1 is set to be longer than the second distance L2 (L1> L2)
  • the second surface 90 is formed at a position protruding from the first surface 80.
  • the second surface 90 is formed by providing a protrusion 92 on the first surface 80.
  • the protrusion 92 has a protrusion amount from the first surface 80 smaller than the groove depth Dd of the groove 100.
  • the stator core 10 includes a stator core C having a protrusion 92 formed by providing a second surface 90 that is closer to the rotating shaft 51 than the first surface 80 on a part of the first surface 80.
  • the stator core D having the groove 100 formed by providing the bottom surface 101 farther from the rotation shaft 51 than the first surface 80 is laminated in the rotation axis direction.
  • the depth of the groove formed in the iron core D is defined as Dd.
  • FIG. 8 is a graph showing the relationship between the groove depth and the amplitude of the cogging torque L-order component.
  • the vertical axis represents the amplitude of the cogging torque L-order component
  • the horizontal axis represents the groove depth.
  • the signs of the amplitudes are different, it indicates that the phases are mutually inverted.
  • Example 1 in the vicinity of the groove depth D0 where the L-order component is 0, the sensitivity of the groove depth to the cogging torque is high (the change in the cogging torque with respect to the change in the groove depth is large). If a groove having this depth is provided, the cogging torque of the product is considered to vary. Therefore, it is considered to adjust the groove depth so that the sensitivity to the cogging torque is lowered.
  • the amplitude of the cogging torque L-order component is minimum and maximum, respectively, and therefore the sensitivity of the cogging torque to the groove depth is low. And are in opposite phase to each other. Therefore, by stacking the cores manufactured at the depths of these two grooves in the axial direction, a motor with small cogging torque and small variation can be manufactured.
  • Example 2 in which the stator core C and the stator core D are stacked at a ratio satisfying the formula (2), and in the case where there is no groove (stacked only with the iron core C) Shows the cogging torque waveform.
  • the vertical axis is cogging torque
  • the horizontal axis is electrical angle.
  • the cogging torque L-order component is dominant and the amplitude is large, but in the case of Example 2, the L-order component is canceled and the cogging torque is reduced.
  • Example 3 In the first embodiment, the structure for reducing the L-order component of the cogging torque is described. However, the 2L component is increased by providing the stator core 10 with the groove 100, and the cogging torque cannot be sufficiently reduced. Therefore, in the third embodiment, a structure in which the L-order component is reduced by providing the step skew in the rotor 50 while the L-order component is reduced by the groove 100 provided in the stator core 10 will be described.
  • the rotor 50 When the number of magnets of the rotor 50 is M (M is a natural number), the number of teeth 60 provided on the stator core 10 is N (N is a natural number), and the least common multiple of M and N is L, the rotor 50 Is provided with a step skew having an angle smaller than the skew angle that minimizes the L-order component of the cogging torque.
  • FIG. 10 is a perspective view of the rotor 50 when a step skew is provided.
  • ⁇ s is a skew angle.
  • P the P-order component of cogging torque
  • the torque during energization decreases as ⁇ s increases, but when the 2L order component is canceled by the step skew, ⁇ s can be smaller than when the L order component is canceled, and therefore the L order component is canceled by the step skew. Less decrease in torque.
  • FIG. 11 shows the cogging torque waveforms of Example 3 in which the stator 20 having the same groove as that of Example 1 and the rotor 50 having step skew are combined, and Example 1 in which no step skew is provided. .
  • the L-order component of the cogging torque is removed, but the 2L-order component remains.
  • the cogging torque can be reduced as compared with the first embodiment.
  • the present invention is not limited to the above-described embodiments, and various designs can be made without departing from the spirit of the present invention described in the claims. It can be changed.
  • the above-described embodiment has been described in detail for easy understanding of the present invention, and is not necessarily limited to one having all the configurations described.
  • a part of the configuration of an embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of an embodiment.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)
PCT/JP2016/085838 2015-12-10 2016-12-02 回転電機 WO2017099002A1 (ja)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2015-241487 2015-12-10
JP2015241487A JP6580479B2 (ja) 2015-12-10 2015-12-10 回転電機

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WO2017099002A1 true WO2017099002A1 (ja) 2017-06-15

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WO (1) WO2017099002A1 (enrdf_load_stackoverflow)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109450122A (zh) * 2018-12-03 2019-03-08 江苏雷利电机股份有限公司 用于步进电机的定子铁芯以及包括其的定子和步进电机
CN113439382A (zh) * 2019-03-28 2021-09-24 日本电产株式会社 马达
WO2023018121A1 (ko) * 2021-08-09 2023-02-16 엘지이노텍 주식회사 모터

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6416826B2 (ja) * 2016-06-14 2018-10-31 本田技研工業株式会社 回転電機
JP6942799B2 (ja) 2017-05-31 2021-09-29 富士フイルム株式会社 平版印刷版原版、及び、平版印刷版の作製方法
JP2020018122A (ja) * 2018-07-26 2020-01-30 株式会社デンソー 回転電機
JP7484777B2 (ja) 2021-03-11 2024-05-16 株式会社デンソー 回転電機

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009171802A (ja) * 2008-01-21 2009-07-30 Panasonic Corp ステータコア
JP2009189163A (ja) * 2008-02-06 2009-08-20 Nippon Densan Corp モータ
WO2012032591A1 (ja) * 2010-09-06 2012-03-15 三菱電機株式会社 永久磁石型回転電機及びそれを用いた電動パワーステアリング装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009171802A (ja) * 2008-01-21 2009-07-30 Panasonic Corp ステータコア
JP2009189163A (ja) * 2008-02-06 2009-08-20 Nippon Densan Corp モータ
WO2012032591A1 (ja) * 2010-09-06 2012-03-15 三菱電機株式会社 永久磁石型回転電機及びそれを用いた電動パワーステアリング装置

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109450122A (zh) * 2018-12-03 2019-03-08 江苏雷利电机股份有限公司 用于步进电机的定子铁芯以及包括其的定子和步进电机
CN113439382A (zh) * 2019-03-28 2021-09-24 日本电产株式会社 马达
WO2023018121A1 (ko) * 2021-08-09 2023-02-16 엘지이노텍 주식회사 모터

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