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JP-7856059-B2 - Rotating electric machine

JP7856059B2JP 7856059 B2JP7856059 B2JP 7856059B2JP-7856059-B2

Inventors

  • 瀬口 正弘
  • 土屋 裕之

Assignees

  • 株式会社デンソー

Dates

Publication Date
20260511
Application Date
20230620

Claims (7)

  1. A stator (50) having stator windings (52), A rotor (60) having a rotor core (61) and main pole portions (62, 162, 262A, 262B) provided for each magnetic pole arranged in the circumferential direction and projecting radially from the rotor core toward the stator side, The field winding (70) wound around each of the aforementioned main poles, A retaining member (90) is provided between adjacent main pole portions in the circumferential direction and attached to the rotor, covering the field winding from the stator side, Equipped with, The field winding has a first winding section (71a) and a second winding section (71b) that are electrically connected in series. The first winding section is positioned radially closer to the stator than the second winding section. The holding member is constructed by stacking plate-shaped members (91) made of metal material in the axial direction . The aforementioned retaining member is A first plate portion (100) is provided on the stator side relative to the first winding portion in the radial direction, and covers the first winding portion from the stator side, A second plate portion (110) is provided radially between the first winding portion and the second winding portion, and covers the second winding portion from the stator side, A connecting portion (120) is provided between adjacent first winding portions in the circumferential direction and extends radially to connect the first plate portion and the second plate portion, It has, A rotating electric machine in which, of the plate-shaped members constituting the holding member, at least one of the second plate portion and the connecting portion is welded or riveted to fix the plate-shaped members together .
  2. A stator (50) having stator windings (52), A rotor (60) having a rotor core (61) and main pole portions (62, 162, 262A, 262B) provided for each magnetic pole arranged in the circumferential direction and projecting radially from the rotor core toward the stator side, The field winding (70) wound around each of the aforementioned main poles, A retaining member (90) is provided between adjacent main pole portions in the circumferential direction and attached to the rotor, and covers the field winding from the stator side, Equipped with, The field winding has a first winding section (71a) and a second winding section (71b) that are electrically connected in series. The first winding section is positioned radially closer to the stator than the second winding section. The holding member is constructed by stacking plate-shaped members (91) made of metal material in the axial direction. The aforementioned retaining member is A first plate portion (100) is provided on the stator side relative to the first winding portion in the radial direction, and covers the first winding portion from the stator side, A second plate portion (110) is provided radially between the first winding portion and the second winding portion, and covers the second winding portion from the stator side, A connecting portion (120) is provided between adjacent first winding portions in the circumferential direction and extends radially to connect the first plate portion and the second plate portion, It has, Of the plate-shaped members constituting the holding member, at least one of the portion of the second plate and the portion of the connecting part is welded or riveted to fix the plate-shaped members together. The stator is, Back yoke (51a) and Multiple teeth (51b) are provided in a circumferential direction and protrude radially from the back yoke toward the rotor, It has, At least one of the circumferential ends of the tip portion of the main pole portion (62) has axially extending notches (300, 310A, 310B) formed therein. If the slot pitch of the stator is β and the width of the notch in the circumferential direction is θnt, then "1/3 × β < θnt < 2/3 × β" is given. In the main electrode portion, the portion missing due to the notch is provided with a non-magnetic portion (400, 500) made of a non-magnetic material. A rotating electric machine, wherein the circumferential end of the tip of the main pole and the non-magnetic portion are provided with recesses (401, 501) that are recessed in the circumferential direction, into which the circumferential end of the first plate portion is fitted.
  3. The rotating electric machine according to claim 2 , wherein "θnt = β/2".
  4. A stator (50) having stator windings (52), A rotor (60) having a rotor core (61) and main pole portions (62, 162, 262A, 262B) provided for each magnetic pole arranged in the circumferential direction and projecting radially from the rotor core toward the stator side, The field winding (70) wound around each of the aforementioned main poles, A retaining member (90) is provided between adjacent main pole portions in the circumferential direction and attached to the rotor, covering the field winding from the stator side, Equipped with, The field winding has a first winding section (71a) and a second winding section (71b) that are electrically connected in series. The first winding section is positioned radially closer to the stator than the second winding section. The holding member is constructed by stacking plate-shaped members (91) made of metal material in the axial direction. The aforementioned retaining member is A first plate portion (100) is provided on the stator side relative to the first winding portion in the radial direction, and covers the first winding portion from the stator side, A second plate portion (110) is provided radially between the first winding portion and the second winding portion, and covers the second winding portion from the stator side, A connecting portion (120) is provided between adjacent first winding portions in the circumferential direction and extends radially to connect the first plate portion and the second plate portion, It has, Of the plate-shaped members constituting the holding member, at least one of the portion of the second plate and the portion of the connecting part is welded or riveted to fix the plate-shaped members together. The main electrode portion has a first main electrode portion (262A) and a second main electrode portion (262B), The tip of the first main pole is provided with a first long flange (265A) extending in the first direction in the circumferential direction, and a first short flange (266A) extending in the second direction opposite to the first direction in the circumferential direction. The circumferential length dimension of the first long side flange is greater than the circumferential length dimension of the first short side flange. The tip of the second main pole is provided with a second short flange (265B) extending in the first direction in the circumferential direction, and a second long flange (266B) extending in the second direction in the circumferential direction. The circumferential length dimension of the second short flange is shorter than the circumferential length dimension of the second long flange. A rotating electric machine in which, when the circumferential displacement between the circumferential tip of the first long flange and the circumferential tip of the second short flange is θnt, and the circumferential displacement between the circumferential tip of the first short flange and the circumferential tip of the second long flange is θnt, and the one-slot pitch of the stator is β , the relationship "1/3 × β < θnt < 2/3 × β" holds.
  5. The rotating electric machine according to claim 4 , wherein "θnt = β/2".
  6. A stator (50) having stator windings (52), A rotor (60) having a rotor core (61) and main pole portions (62, 162, 262A, 262B) provided for each magnetic pole arranged in the circumferential direction and projecting radially from the rotor core toward the stator side, The field winding (70) wound around each of the aforementioned main poles, A retaining member (90) is provided between adjacent main pole portions in the circumferential direction and attached to the rotor, covering the field winding from the stator side, Equipped with, The field winding has a first winding section (71a) and a second winding section (71b) that are electrically connected in series. The first winding section is positioned radially closer to the stator than the second winding section. The holding member is constructed by stacking plate-shaped members (91) made of metal material in the axial direction. The aforementioned retaining member is A first plate portion (100) is provided on the stator side relative to the first winding portion in the radial direction, and covers the first winding portion from the stator side, A second plate portion (110) is provided radially between the first winding portion and the second winding portion, and covers the second winding portion from the stator side, A connecting portion (120) is provided between adjacent first winding portions in the circumferential direction and extends radially to connect the first plate portion and the second plate portion, It has, Of the plate-shaped members constituting the holding member, at least one of the portion of the second plate and the portion of the connecting part is welded or riveted to fix the plate-shaped members together. Of the main pole portion (162), the circumferential length dimension of the reduced diameter portion (170b), which is the portion on the rotor core side in the radial direction, is smaller than the circumferential length dimension of the enlarged diameter portion (170a), which is the portion on the stator side in the radial direction. A rotating electric machine in which both circumferential ends of the second plate portion are supported by the stepped portion (167) between the enlarged diameter portion and the reduced diameter portion.
  7. The rotor is A diode (80) electrically connected in parallel to the series connection of the first winding section and the second winding section, A capacitor (81) electrically connected in parallel to either the first winding section or the second winding section, It has, The rotating electric machine according to any one of claims 1 to 6 , wherein a harmonic current for inducing a field current in the field winding is configured to flow through the stator winding.

Description

This disclosure relates to a wound-field type rotating electric machine. A known type of rotating electric machine comprises a stator with stator windings, a rotor, and field windings. The rotor has a rotor core and main pole portions, each provided for a circumferentially aligned magnetic pole and projecting radially from the rotor core towards the stator. The field windings are wound around each main pole portion. The rotating electric machine is equipped with a holding member. The holding member covers the field winding from the stator side and restricts the radial movement of the field winding. Such a rotating electric machine is described, for example, in Patent Document 1. Japanese Patent Publication No. 2010-45956 Overall configuration diagram of the control system for a rotating electric machine according to the first embodiment.A diagram showing the inverter and its peripheral components.Cross-sectional view of the rotor and stator.A diagram showing the electrical circuitry of the rotor.Cross-sectional view of the rotor.Perspective view of the retaining member.A perspective view showing an example of a welding location on a retaining member.This figure shows the calculation results of eddy current losses occurring in the outer and inner plate sections.A cross-sectional view of the rotor according to the second embodiment.A cross-sectional view of the rotor according to the third embodiment.Perspective view of the retaining member.A cross-sectional view of the rotor according to the fourth embodiment.Cross-sectional view of the rotor.A plan view showing the main pole section unfolded in the circumferential direction.A plan view showing the main pole portion of a modified fourth embodiment unfolded in the circumferential direction.A cross-sectional view of the rotor according to the fifth embodiment.Perspective view of a non-magnetic component.A perspective view showing how a non-magnetic component is fixed to the main electrode.A plan view showing the main pole portion of a modified example of the fifth embodiment unfolded in the circumferential direction.A perspective view of a non-magnetic member according to a modified example of the fifth embodiment.A cross-sectional view of the rotor according to the sixth embodiment. Multiple embodiments will be described with reference to the drawings. In multiple embodiments, functionally and/or structurally corresponding and/or related parts may be given the same reference numeral, or reference numerals that differ by hundreds or more digits. For corresponding and/or related parts, refer to the descriptions of other embodiments. <First Embodiment> Hereinafter, a first embodiment of the rotating electric machine and control device for the rotating electric machine described herein will be explained with reference to the drawings. The rotating electric machine and control device constitute a control system for the rotating electric machine, and the control system is mounted on a vehicle. The rotating electric machine is the power source for the vehicle's movement. As shown in Figure 1, the control system comprises a DC power supply 10, an inverter 20, a control device 30, and a rotating electric machine 40. The rotating electric machine 40 is a field-wound synchronous machine. For example, the rotating electric machine 40, inverter 20, and control device 30 may constitute a mechatronic drive unit, or the rotating electric machine 40, inverter 20, and control device 30 may each be configured as separate components. The rotating electric machine 40 comprises a housing 41 and a stator 50 and rotor 60 housed within the housing 41. The rotating electric machine 40 in this embodiment is an inner-rotor type, in which the rotor 60 is positioned radially inward of the stator 50. The stator 50 comprises a stator core 51 and stator windings 52. The stator windings 52 are made of, for example, copper wire and include U, V, and W phase windings 52U, 52V, and 52W, which are arranged at an electrical angle of 120° from each other. The rotor 60 comprises a rotor core 61 and a field winding 70. The field winding 70 is constructed, for example, by compression molding. This improves the space utilization ratio and enhances the ease of assembly of the field winding 70. The field winding 70 may be made of, for example, aluminum wire. Aluminum wire has a low specific gravity, which reduces the centrifugal force when the rotor 60 rotates. Aluminum wire has lower strength and hardness compared to copper wire, making it suitable for compression molding. Furthermore, the field winding 70 is not limited to aluminum wire; for example, it may be made of copper wire or CNT (carbon nanotube). Also, the field winding 70 does not necessarily have to be compression molded. A rotating shaft 32 is inserted through the central hole of the rotor core 61. The rotating shaft 32 is rotatably supported in the housing 41 via a bearing 42. As shown in Figure 2, the inverter 20 comprises a series connec