WO2023210091A1

WO2023210091A1 - Wound-field rotating electric machine and power feeding device

Info

Publication number: WO2023210091A1
Application number: PCT/JP2023/003658
Authority: WO
Inventors: 智矢枡谷
Original assignee: 株式会社アイシン
Priority date: 2022-04-28
Filing date: 2023-02-03
Publication date: 2023-11-02

Abstract

Disclosed is a wound-field rotating electric machine comprising: a rotor and a stator; and a power feeding device on the stationary side. The power feeding device comprises: first and second brushes; first and second holder members that hold the first and second brushes; first and second bus bars with which the first and second holder members are provided; a conductive first fixing member for fixing the first brush to the first holder member; a conductive second fixing member for fixing the second brush to the second holder member; and a first conduction member from the first and second brushes. In the first and second holder members, first and second attachment holes for fixing the first and second fixing members are formed so as to penetrate in a motor axis direction. The first and second holder members are overlapped with each other in the motor axis direction such that the first and second attachment holes are not overlapped with each other when viewed in the motor axis direction.

Description

Wound field type rotating electric machine and power supply device

The present disclosure relates to a wound field type rotating electric machine and a power supply device.

A power feeding structure including a positive electrode brush is arranged on one surface of a holder made of an electrically insulating material such as resin, and a power feeding structure including a negative electrode brush is arranged on the other surface of the holder. There is a known technology.

International Publication No. 2020/148014 pamphlet

However, in the above-mentioned conventional technology, due to holes for fixing members (for example, rivet holes) for fixing the components of the power supply configuration to the holder, the power supply configuration on the positive side and the power supply on the negative side It is difficult to ensure appropriate electrical insulation between the components. Such a problem also occurs in a configuration in which a plurality of phases of alternating current are supplied to the rotor via brushes. That is, in this case, it is difficult to appropriately ensure electrical insulation between the power supply configuration related to one phase and the power supply configuration related to the other phase.

Therefore, in one aspect, the present disclosure aims to appropriately ensure electrical insulation between the power supply structures arranged on both sides of the holder.

In one aspect, it is a wound field type rotating electric machine,
stator and
A rotor core having a shaft portion, a rotor core coaxially fixed to the shaft portion, and a field winding wound around a plurality of teeth portions of the rotor core, and arranged coaxially with the stator and with a gap in the radial direction. a rotor that is
a rotation-side power supply device including a slip ring provided on the shaft portion so as to rotate together with the shaft portion and connected to the field winding;
a fixed-side power supply device that includes a brush that is slidable on the slip ring and supplies power to the field winding together with the rotation-side power supply device;
The fixed side power supply device is
one or more first brushes on the positive electrode side or the first phase side;
one or more second brushes on the negative electrode side or second phase side that are arranged at different angular positions from each of the first brushes around the motor shaft;
a first holder member that holds one or more of the first brushes and is formed of an insulating material;
a second holder member that holds one or more of the second brushes and is formed of an insulating material;
a first bus bar provided on the first holder member for electrically connecting one or more of the first brushes to a first electrode part from a power source;
a second bus bar provided on the second holder member for electrically connecting the one or more second brushes to a second electrode part from a power source;
a conductive first fixing member for fixing one or more of the first brushes to the first holder member;
a conductive second fixing member for fixing one or more of the second brushes to the second holder member;
a first conductive member having one end joined to the first brush and the other end joined to the first bus bar;
a second conductive member having one end joined to the second brush and the other end joined to the second bus bar;
A first mounting hole for fixing the first fixing member is formed in the first holder member so as to penetrate in the motor axial direction,
A second mounting hole for fixing the second fixing member is formed in the second holder member so as to penetrate in the motor axial direction,
The first holder member and the second holder member are arranged in a wire-wound field type rotation system that is overlapped in the motor axial direction in such a manner that the first mounting hole and the second mounting hole do not overlap when viewed in the motor axial direction. Electrical equipment is provided.

In one aspect, according to the present disclosure, it is possible to appropriately ensure electrical insulation between the power supply structures arranged on both sides of the holder.

FIG. 1 is a configuration diagram showing a vehicle drive system including a drive device for a rotating electrical machine according to an embodiment. FIG. 2 is a schematic cross-sectional view showing a part of the cross section of the rotating electric machine. FIG. 3 is a schematic cross-sectional view showing a part of the cross section of the rotating electric machine (a cross section taken along line AA in FIG. 2). FIG. 2 is a perspective view showing an example of a fixed-side power supply device. It is a top view which shows the positive electrode side structure arrange|positioned at the X1 side of the brush holder of a power supply device. FIG. 3 is a plan view showing a part of the configuration on the X1 side in perspective, along with the negative electrode side structure arranged on the X2 side of the brush holder of the power feeding device. 7 is a cross-sectional view of the power supply device taken along a plane along line BB in FIG. 6. FIG. 7 is a cross-sectional view of the power supply device taken along a plane along line CC in FIG. 6. FIG. It is a perspective view showing a positioning part locally. FIG. 3 is an explanatory diagram of a power supply device according to a comparative example. 10 is a cross-sectional view taken along line DD in FIG. 9. FIG. 7 is a cross-sectional view taken along line EE in FIG. 6. FIG. FIG. 7 is a perspective view showing a fixed-side power supply device according to a modified example.

Hereinafter, each embodiment will be described in detail with reference to the accompanying drawings. Note that the dimensional ratios in the drawings are merely examples, and are not limited thereto, and shapes, etc. in the drawings may be partially exaggerated for convenience of explanation.

FIG. 1 is a configuration diagram showing a vehicle drive system 1 including a drive device 5 for a rotating electrical machine according to this embodiment. FIG. 2 is a schematic cross-sectional view showing a part of the cross section of the rotating electric machine 3 (a cross section cut along a plane including the rotation axis I). FIG. 3 is a schematic sectional view showing a part of the cross section of the rotating electric machine 3 (a cross section taken along line AA in FIG. 2). In FIG. 2, an X direction along the rotation axis I, an X1 side, and an X2 side are defined. Furthermore, although the rotating power supply device 7 and the fixed power supply device 8 are schematically shown in FIGS. 1 and 2, for the detailed configuration of the fixed power supply device 8, see FIG. 4 and subsequent figures. and will be described later.

The vehicle drive system 1 has a two-power supply configuration including a low-voltage battery 2A and a high-voltage battery 2B, and includes a rotating electric machine 3 and a drive device 5.

The low voltage battery 2A is, for example, a lead battery, and has a rated voltage of, for example, 12V.

The high voltage battery 2B is, for example, a lithium ion battery, and has a rated voltage significantly higher than that of the low voltage battery 2A, for example, has a rated voltage of 40V or more. In this embodiment, as an example, the rated voltage of the high voltage battery 2B is assumed to be 300V or more. Note that the high voltage battery 2B may be in the form of a fuel cell or the like.

The rotating electrical machine 3 is a wound field type rotating electrical machine. Specifically, the rotating electric machine 3 is a wire-wound field type equipped with a rotating power supply device 7 and a stationary power supply device 8, and includes a rotor 310 and a stator 320. The rotor 310 is arranged radially inside the stator 320, coaxially with the stator 320, and with a gap provided in the radial direction. Rotor 310 has a rotor core 312, a shaft portion 314, and rotor windings 316. The rotor core 312 is coaxially fixed to the shaft portion 314. The axial end face of the rotor core 312 may be covered with a rotor cover 313. Note that, as shown in FIG. 3, the rotor core 312 has teeth portions 3122 that protrude outward in the radial direction, and a conductor wire forming the rotor winding 316 is wound around the teeth portions 3122. The stator winding 322 is wound around the teeth portion 3210 of the stator core 321, as shown in FIG.

The rotor winding 316 has lead wires 3161 and 3162 that are electrically connected to a rotating power supply device 7 including a positive slip ring 71 and a positive brush 81, which will be described later. Note that the lead wires 3161 and 3162 extend axially outward from the coil ends of the rotor winding 316 (portions that protrude outward in the axial direction from the end surface of the rotor core 312), and are part of the rotor winding 316. It's fine.

The drive device 5 includes a microcomputer 50 (hereinafter referred to as "microcomputer 50") and an electric circuit section 60.

The microcomputer 50 may be realized as, for example, an ECU (Electronic Control Unit). The microcomputer 50 is connected to various electronic components (other ECUs and sensors) in the vehicle via a network 6 such as a CAN (controller area network).

The microcomputer 50 receives various commands such as control commands from a host ECU (not shown) via the network 6. The microcomputer 50 controls the rotating electric machine 3 via the electric circuit section 60 based on the control command.

The electric circuit section 60 includes a smoothing capacitor 62, a power conversion circuit section 63, and a power supply circuit section 64.

The smoothing capacitor 62 is provided between the high potential side line 20 and the low potential side line 22 of the high voltage battery 2B. A resistor R0 for passive discharge may be connected to both ends of the smoothing capacitor 62.

The power conversion circuit section 63 is in the form of an inverter, and forms, for example, a three-phase bridge circuit. The power conversion circuit section 63 is connected between the high potential side line 20 and the low potential side line 22 in a manner parallel to the smoothing capacitor 62. The power conversion circuit section 63 includes each switching element SW3 of the arm on the high potential side and each switching element SW4 of the arm on the low potential side. In this case, the microcomputer 50 may control energization to the stator winding 322 by controlling the on/off state of each switching element SW3, SW4 of the power conversion circuit section 63 via the gate driver circuit 52.

The power supply circuit section 64 includes a bridge circuit section 641 and a drive circuit section 642.

The bridge circuit section 641 is connected between the high potential side line 20 and the low potential side line 22 in a manner parallel to the smoothing capacitor 62 and the resistor R0 for passive discharge. Bridge circuit section 641 includes a pair of switching elements SW1 and SW2 and a pair of diodes D1 and D2.

The switching element SW1 is connected in series to the diode D1 in such a manner that it is connected to the high potential side cathode of the diode D1. A positive end of the rotor winding 316 is electrically connected between the switching element SW1 and the diode D1 via a positive slip ring 71 and a positive brush 81, which will be described later. Further, the switching element SW2 is connected in series to the diode D2 in such a manner that it is connected to the low potential side anode of the diode D2. A negative end of the rotor winding 316 is electrically connected between the switching element SW2 and the diode D2 via a negative slip ring 72 and a negative brush 82, which will be described later.

The on/off state of the pair of switching elements SW1 and SW2 is switched via the drive circuit section 642. The pair of switching elements SW1 and SW2 change the energization state to the rotor winding 316 under the control of the drive circuit section 642. The switching elements SW1 and SW2 are, for example, IGBT (Insulated Gate Bipolar Transistor), MOSFET (Metal Oxide Semiconductor Field-Effect Tran) It may also take other forms, such as ``sister''.

The drive circuit section 642 drives the gates of the switching element SW1 and the switching element SW2 based on the control signal from the microcomputer 50.

Next, the characteristic configuration of this embodiment will be described with reference to FIG. 2 and FIG. 4 onwards, while referring to FIG. 2 as appropriate.

In the following description, the axial direction refers to the direction in which the rotating shaft I of the rotating electrical machine 3 extends (X direction), and the radial direction refers to the radial direction around the rotating shaft I. Therefore, the radially outer side refers to the side away from the rotation axis I, and the radially inner side refers to the side facing the rotation axis I. Further, the axially outer side refers to the side away from the axial center of the stator 320, and the axially inner side refers to the side closer to the axial center of the stator 320. Further, the circumferential direction corresponds to the direction of rotation around the rotation axis I.

FIG. 4 is a perspective view showing an example of a fixed-side power supply device 8 (hereinafter also simply referred to as "power supply device 8"). FIG. 5 is a plan view showing the positive electrode side structure arranged on the X1 side of the brush holder 83 of the power supply device 8. As shown in FIG. FIG. 6 is a plan view showing a part of the configuration on the X1 side in perspective (dotted line) together with the negative electrode side structure disposed on the X2 side of the brush holder 83 of the power supply device 8. FIG. 7 is a cross-sectional view of the power supply device 8 taken along a plane along line BB in FIG. FIG. 8 is a cross-sectional view of the power supply device 8 taken along a plane along line CC in FIG. FIG. 8A is a perspective view locally showing the positioning portion 8319.

The power supply device 8 may be fixed to the case 2 that houses and supports the rotating electric machine 3. The power supply device 8 includes a positive brush 81, a negative brush 82, a brush holder 83, a positive wiring section 91, a negative wiring section 92, a positive fixing member 101, and a negative fixing member 102. include.

As schematically shown in FIG. 2, the positive brush 81 is attached to the positive slip ring 71 in such a manner that its radially inner end abuts the positive slip ring 71 of the rotating power supply device 7 in the radial direction. It is arranged so as to be able to slide against it. A plurality of positive electrode side brushes 81 may be provided around the rotation axis I. In this embodiment, as an example, three positive electrode side brushes 81 are provided around the rotation axis I at intervals of 120 degrees. The positive electrode side brush 81 may be urged inward in the radial direction by an elastic member (not shown).

As schematically shown in FIG. 2, the negative brush 82 is attached to the negative slip ring 72 in such a manner that its radially inner end abuts the negative slip ring 72 of the rotating power supply device 7 in the radial direction. It is arranged so as to be able to slide against it. A plurality of negative electrode side brushes 82 may be provided around the rotation axis I. In this embodiment, as an example, three negative electrode side brushes 82 are provided around the rotation axis I at intervals of 120 degrees. In this case, the three negative brushes 82 may be provided around the rotation axis I such that their phases are shifted by 60 degrees with respect to the three positive brushes 81 described above. The negative electrode side brush 82 may be urged inward in the radial direction by an elastic member (not shown).

The brush holder 83 is made of a material that has lower conductivity than the conductor. The brush holder 83 may be made of an insulating material such as a resin material, for example. The brush holder 83 is provided around the positive slip ring 71 and the negative slip ring 72 of the power supply device 7 on the rotating side. The brush holder 83 is in the form of an annular plate centered on the rotation axis I, and extends in a plane perpendicular to the rotation axis I.

The brush holder 83 holds the positive electrode side brush 81 and the negative electrode side brush 82. In this embodiment, in the brush holder 83, the positive brush 81 is arranged on the surface on the X1 side, and the negative brush 82 is arranged on the surface on the X2 side. However, in a modified example, the polarity may be reversed, and specifically, the positive brush 81 may be disposed on the X2 side surface, and the negative brush 82 may be disposed on the X1 side surface.

The brush holder 83 may be formed of one member, but is preferably formed of two or more members. In this embodiment, the brush holder 83 includes two members, a positive electrode side holder member 831 and a negative electrode side holder member 832. In this case, the positive brush 81 is attached to the positive holder member 831 by the positive fixing member 101 described later, and the negative brush 82 is attached to the negative holder member 832 by the negative fixing member 102 described later. . For this purpose, as shown in FIG. 7, the positive electrode side holder member 831 is provided with an attachment hole 8310 for the rivet 1012, and the negative electrode side holder member 832 is provided with an attachment hole 8320 for the rivet 1022.

The positive electrode side holder member 831 has a counterbore portion 83101 on the X2 side of the attachment hole 8310 so as to prevent the rivet 1012 from protruding from the X2 side surface (back surface) of the positive electrode side holder member 831 to the X2 side. Similarly, the negative electrode side holder member 832 has a counterbore portion 83201 on the X1 side of the attachment hole 8320 so as to prevent the rivet 1022 from protruding toward the X1 side from the X1 side surface (back surface) of the negative electrode side holder member 832. . The technical significance of such counterbore portions 83101 and 83201 will be described later.

In this embodiment, as a preferable example, the positive electrode side holder member 831 and the negative electrode side holder member 832 have the same form, and are integrated by aligning their back surfaces in the axial direction. Specifically, the positive electrode side holder member 831 is superimposed on the negative electrode side holder member 832 in such a manner that the surface on the X2 side is combined with the surface on the X1 side of the negative electrode side holder member 832. At this time, the positive electrode side holder member 831 and the negative electrode side holder member 832 are overlapped with each other in an angular relationship shifted around the rotation axis I. In this embodiment, in order to form a phase shift of 60 degrees as described above, the positive electrode side holder member 831 and the negative electrode side holder member 832 are placed in an angular relationship (hereinafter referred to as " (also referred to as "regular angular relationship"). According to such a configuration, since the positive electrode side holder member 831 and the negative electrode side holder member 832 can be formed from a common component, manufacturing costs can be reduced.

The positive electrode side holder member 831 and the negative electrode side holder member 832 preferably have a positioning portion 8319, a It has 8329. In this example, the positive electrode side holder member 831 and the negative electrode side holder member 832 have the same form, and therefore the positioning parts 8319 and 8329 also have the same form. Specifically, the positioning portion 8319 (the same applies to the positioning portion 8329) has a concave-convex shape with a concave portion 83190 and a convex portion 83191, as shown in FIG. 8A. The positioning parts 8319 and 8329 are arranged so that the concave part 83190 and the convex part 83191 of the positioning part 8319 are connected to the convex part 83291 of the positioning part 8329 only when the angular relationship between the positive electrode side holder member 831 and the negative electrode side holder member 832 becomes a regular angular relationship. and a recess 83290 (see FIG. 8).

The positive electrode side wiring part 91 is a wiring part for electrically connecting the positive electrode side brush 81 to the positive electrode of the high voltage battery 2B, and one end is connected to the positive electrode side brush 81 and the other end is connected to the positive electrode side electrode part 912. be done. The positive electrode side wiring part 91 is attached to the surface of the positive electrode side holder member 831 on the X1 side.

The negative electrode side wiring section 92 is a wiring section for electrically connecting the negative electrode side brush 82 to the negative electrode of the high voltage battery 2B, and has one end connected to the negative electrode side brush 82 and the other end connected to the negative electrode side electrode section 922. be done. The negative electrode side wiring part 92 is attached to the surface of the negative electrode side holder member 832 on the X2 side.

More specifically, the positive wiring section 91 may include, for example, a positive bus bar 910 extending in a plane perpendicular to the axial direction. The positive bus bar 910 is a plate-shaped conductor, and is provided on the X1 side surface of the positive holder member 831 so as to pass below the radially outer ends of the three positive brushes 81 . Similarly, the negative wiring section 92 includes, for example, a negative bus bar 920 that extends in a plane perpendicular to the axial direction, and passes below the radially outer ends of the three negative brushes 82. , is provided on the X2 side surface of the negative electrode side holder member 832.

In this embodiment, as described above, since the positive electrode side holder member 831 and the negative electrode side holder member 832 have the same configuration, each of the positive electrode side wiring section 91 and the negative electrode side wiring section 92 preferably has the following configurations: have the same morphology. In this case, the positive electrode side holder member 831 to which the positive electrode side wiring part 91 is attached and the negative electrode side holder member 832 to which the negative electrode side wiring part 92 is attached have the same form, reducing the variation of parts and manufacturing cost. It is possible to reduce the Note that in the assembled state, the positive electrode side wiring portion 91 and the negative electrode side wiring portion 92 have an angular deviation corresponding to the normal angular relationship (angular relationship deviated by 60 degrees around the rotation axis I) as described above.

The positive electrode side wiring part 91 may be electrically connected to the positive electrode side brush 81 by the positive electrode side bus bar 910 coming into contact with a positive electrode side fixing member 101 (fixing bracket 1010), which will be described later. Alternatively, the positive electrode side wiring portion 91 may be a separate conductor wire (see conductive member 918 in FIG. ) may also be included. This also applies to the negative electrode side wiring section 92. That is, the negative electrode side wiring part 92 has one end (for example, the radially outer end surface) joined to the negative electrode side brush 82 and another conductor wire (see conductive member 928 in FIG. 6) whose other end is joined to the negative electrode side bus bar 920. ) may also be included.

The positive electrode side fixing member 101 is a fixing member for fixing the positive electrode side brush 81 to the brush holder 83 (positive electrode side holder member 831), and in this embodiment, includes a fixing bracket 1010 and a rivet 1012 as an example. . The fixing bracket 1010 has a hat-shaped cross section, extends to cover three of the four sides of the positive brush 81, and has through holes 10110 (see FIG. 7). A fixing bracket 1010 is provided for each positive electrode side brush 81. In this embodiment, as an example, four rivets 1012 are provided for one fixed bracket 1010, but the number is arbitrary.

The negative electrode side fixing member 102 is a fixing member for fixing the negative electrode side brush 82 to the brush holder 83 (negative electrode side holder member 832), and in this embodiment, includes a fixing bracket 1020 and a rivet 1022 as an example. . The fixing bracket 1020 has a hat cross-section, extends to cover three of the four sides of the negative brush 82, and has through holes 10210 (see FIG. 7). A fixing bracket 1020 is provided for each negative electrode side brush 82. In this embodiment, as an example, four rivets 1022 are provided for one fixed bracket 1020, but the number is arbitrary.

In this embodiment, each rivet 1012 of the positive electrode side fixing member 101 fixes each positive electrode side brush 81 to the X1 side surface of the positive electrode side holder member 831 via the fixing bracket 1010. Note that each rivet 1012 for fixing each positive electrode side brush 81 to the positive electrode side holder member 831 is common. Each rivet 1012 of the positive electrode side fixing member 101 may fix each positive electrode side brush 81 together with the positive electrode side wiring part 91 to the X1 side surface of the positive electrode side holder member 831. In this case, as shown in FIG. 7, the fixing bracket 1010 is overlapped with the leg portions 1011 on both sides resting on the X1 side surface of the positive electrode side wiring portion 91, and is fixed with a rivet 1012. For this purpose, a through hole 914 (see FIG. 7) through which the rivet 1012 passes is also formed in the positive bus bar 910 of the positive wiring section 91.

Similarly, each rivet 1022 related to the negative electrode side fixing member 102 fixes each negative electrode side brush 82 to the X2 side surface of the negative electrode side holder member 832. Note that each rivet 1022 for fixing each negative electrode side brush 82 to the negative electrode side holder member 832 is common. Each rivet 1022 related to the negative electrode side fixing member 102 may fix each negative electrode side brush 82 together with the negative electrode side wiring part 92 to the X2 side surface of the negative electrode side holder member 832. In this case, as shown in FIG. 7, the fixing bracket 1020 is overlapped with the leg portions 1021 on both sides resting on the X2 side surface of the negative electrode side wiring portion 92, and is fixed with a rivet 1022. Note that for this purpose, a through hole 924 (see FIG. 7) through which the rivet 1022 passes is also formed in the negative bus bar 920 of the negative wiring section 92.

FIG. 9 is an explanatory diagram of a power supply device 8' according to a comparative example, and is a diagram showing the same view as FIG. 6.

In the power supply device 8' according to the comparative example shown in FIG. 9, the rivet 1024 for fixing the negative bus bar 920 of the negative wiring part 92 to the brush holder 83' fixes each negative brush 82 to the brush holder 83'. It is set separately from the fixing member for This configuration is similar to the configuration described in Patent Document 1 mentioned above, and is also simply referred to as a "comparative example" hereinafter. In addition, in the comparative example, similarly for the positive electrode side, the rivet for fixing the positive electrode side wiring part 91 to the brush holder 83' is different from the fixing member for fixing each positive electrode side brush 81 to the brush holder 83'. Set separately. In this example, compared to the comparative example, a more efficient fixing method can be realized, and for example, the number of rivets can be reduced.

Next, with reference to FIGS. 9A and 10 while continuing to refer to FIGS. 4 to 9, the characteristic configuration of this embodiment related to electrical insulation between the positive electrode side and the negative electrode side will be described. .

FIG. 9A is a cross-sectional view taken along line DD in FIG. 9. FIG. 10 is a cross-sectional view taken along line EE in FIG. In FIG. 10, for convenience of illustration, the shapes of the rivets 1012 and 1022 are schematically shown, unlike in FIG. Illustration of the configuration of the X2 side surface is omitted.

Here, as mentioned above in the "Problem to be Solved by the Invention" section, in the comparative example (for example, the configuration described in Patent Document 1 above), the power supply configuration on the positive side and the power supply configuration on the negative side It is difficult to ensure proper electrical insulation. For example, in the comparative example, as shown in FIG. 9, the rivet hole 1024A for the rivet 1024 for fixing the negative electrode side wiring part 92 to the brush holder 83' is located at a position overlapping the positive electrode side brush 81 when viewed in the axial direction. It is set in. In this case, it is difficult to ensure appropriate electrical insulation between the conductive rivet 1024 and the positive brush 81. As a result, it becomes difficult to ensure appropriate electrical insulation between the positive electrode side brush 81 and the negative electrode side power supply structure. The same applies to the electrical insulation between the positive electrode side power supply structure and the negative electrode side brush 82.

On the other hand, in this embodiment, each positive electrode side brush 81 does not overlap each negative electrode side brush 82, negative electrode side fixing member 102, and negative electrode side wiring part 92 when viewed in the axial direction, or Even in the overlapping regions when viewed in the axial direction, they are electrically insulated via the material of the brush holder 83 (a material having lower conductivity than a conductor; in this embodiment, a resin material).

Specifically, each positive electrode side brush 81 is out of phase with each negative electrode side brush 82, so that they do not overlap when viewed in the axial direction. Moreover, each positive electrode side brush 81 does not overlap with respect to the negative electrode side fixing member 102 when viewed in the axial direction. This is in contrast to the comparative example described above. In addition, in this embodiment, one of the three positive electrode side brushes 81 is connected to the negative electrode side wiring section 92 due to the fact that the negative electrode side bus bar 920 has a C-shaped form when viewed in the axial direction. On the other hand, they do not overlap when viewed in the axial direction (see FIG. 6). On the other hand, two of the three positive electrode side brushes 81 have a region that overlaps with the negative electrode side wiring section 92 when viewed in the axial direction; One is electrically insulated from the negative electrode side wiring section 92 via the material of the brush holder 83. That is, the material of the brush holder 83 is interposed between each positive electrode side brush 81 and the negative electrode side wiring part 92, as shown in FIG. Thereby, electrical insulation between the positive electrode side brush 81 and the negative electrode side power supply structure can be appropriately ensured.

Similarly, each negative electrode side brush 82 has a region that does not overlap or overlaps each positive electrode side brush 81, positive electrode side fixing member 101, and positive electrode side wiring part 91 when viewed in the axial direction. Also, the brush holder 83 is electrically insulated via the material of the brush holder 83.

Specifically, each negative electrode side brush 82 is out of phase with each positive electrode side brush 81, so that they do not overlap when viewed in the axial direction. Moreover, each negative electrode side brush 82 does not overlap with respect to the positive electrode side fixing member 101 when viewed in the axial direction. This is in contrast to the comparative example described above. In addition, in this embodiment, one of the three negative brushes 82 is connected to the positive wiring portion 91 due to the fact that the positive bus bar 910 has a C-shape when viewed in the axial direction. On the other hand, they do not overlap when viewed in the axial direction. On the other hand, two of the three negative brushes 82 have a region that overlaps the positive wiring portion 91 when viewed in the axial direction; One is electrically insulated from the positive electrode side wiring part 91 via the material of the brush holder 83. That is, the material of the brush holder 83 is interposed between each negative electrode side brush 82 and the positive electrode side wiring part 91, as shown in FIG. Thereby, electrical insulation between the negative electrode side brush 82 and the positive electrode side power supply structure can be appropriately ensured.

Furthermore, in this example, unlike the comparative example described above, the positive electrode side bus bar 910 is provided with rivets such as the rivet 1024 in the region overlapping the negative electrode side brush 82 in the axial direction (i.e., the back side of the negative electrode side brush 82). It is not fixed to the positive electrode side holder member 831. Similarly, in this embodiment, the negative bus bar 920 is fixed to the negative holder member 832 with a rivet such as the rivet 1024 in the region overlapping the positive brush 81 in the axial direction (i.e., the back side of the positive brush 81). It will not be done. As a result, the inconvenience caused by the rivet 1024 (the inconvenience described with reference to FIG. 9A) does not occur.

Further, according to this embodiment, as described above, the positive electrode side holder member 831 has the counterbore portion 83101 on the X2 side of the attachment hole 8310, and the negative electrode side holder member 832 has the counterbore portion 83101 on the X1 side of the attachment hole 8320. It has a counterbore 83201 on the side. By having such counterbore portions 83101 and 83201, the creepage distance between the rivet 1012 on the positive electrode side and the rivet 1022 on the negative electrode side can be efficiently increased, as schematically shown by arrow R10 in FIG. . As a result, electrical insulation can be appropriately ensured between the conductive rivet 1012 on the positive electrode side and the conductive rivet 1022 on the negative electrode side.

Furthermore, in this embodiment, the brush holder 83 is formed by two holder members, that is, a positive electrode side holder member 831 and a negative electrode side holder member 832. Thereby, the positive electrode side holder member 831 is covered with the counterbore portion 83101 of the positive electrode side holder member 831 with the negative electrode side holder member 832, and the counterbore portion 83201 of the negative electrode side holder member 832 is covered with the positive electrode side holder member 831. And the negative electrode side holder member 832 can be assembled. Therefore, the portion of the rivet 1012 located in the counterbore portion 83101 of the positive electrode side holder member 831 is not visible from the X2 side surface of the negative electrode side holder member 832. Further, the portion of the rivet 1022 located in the counterbore portion 83201 of the negative electrode side holder member 832 is not visible from the X1 side surface of the positive electrode side holder member 831. Therefore, according to this embodiment, there are inconveniences caused by accumulation of foreign matter (for example, abrasion powder of the positive electrode side brush 81 and negative electrode side brush 82) in the counterbore portions 83101 and 83201 (for example, electricity (possibility of loss of physical insulation) can also be reduced.

Although each embodiment has been described in detail above, it is not limited to the specific embodiment, and various modifications and changes can be made within the scope of the claims. It is also possible to combine all or a plurality of the components of the embodiments described above.

For example, in the above-described embodiment, the rotating electric machine 3 is for the vehicle drive system 1, but the technology according to this embodiment can also be applied to a wound field type rotating electric machine installed in a vehicle for other purposes. It can also be applied to wound field type rotating electric machines used in a variety of fields other than automobiles.

Furthermore, in the above embodiment, the positive brush 81 that overlaps the negative wiring portion 92 when viewed in the axial direction is electrically insulated from the negative wiring portion 92 via the material of the brush holder 83. However, the positive electrode side brush 81, which overlaps the negative electrode side wiring part 92 when viewed in the axial direction, is made of a different material from the material of the brush holder 83, and is electrically connected to the negative electrode side wiring part 92 through another insulating material. may be insulated. This also applies to the negative electrode side brush 82 which overlaps the positive electrode side wiring section 91 when viewed in the axial direction. For example, a power supply device 8A shown in FIG. 11 has a structure similar to that of the comparative example described above, but the end of the rivet 1024 (the end near the negative electrode side) is covered with an insulating member 1025. . That is, the rivet hole 1024A is closed by the insulating member 1025. In this case, the positive bus bar 910A of the positive wiring portion 91A of the power supply device 8A may have a hole 916A or a notch for assembling the insulating member 1025. Even with such a power supply device 8A, it is possible to obtain the same effects as in this embodiment as described above. Note that the power supply device 8A has a one-piece brush holder 83A (the same brush holder 83A as the brush holder 83' according to the comparative example) instead of the brush holder 83; You may.

Furthermore, in the above-described embodiment, the rivets 1012 and 1022 are used as fixing members, but fastening members such as bolts and nuts may be used instead.

Further, in the above-described embodiment, the configuration is such that a DC current is applied to the rotor winding 316, but a configuration in which an AC current is applied to the rotor winding (for example, a configuration as disclosed in Japanese Patent Application Laid-Open No. 2012-222843) may be used. is also applicable. In this case, the configuration of the above embodiment may be applied to any two of the three phases, for example. In this case, the configuration related to the first phase may be substantially the same as the configuration on the positive electrode side described above (positive electrode side holder member 831, positive electrode side brush 81, etc.), and the configuration related to the second phase may be substantially the same as the configuration on the positive electrode side described above (positive electrode side holder member 831, positive electrode side brush 81, etc.). It may be substantially the same as the configuration of the negative electrode side (negative electrode side holder member 832, negative electrode side brush 82, etc.). Further, in this case, an electrode part (not shown) corresponding to the positive electrode part 912 is electrically connected to the midpoint of the upper and lower arms related to the first phase of an inverter (not shown) for applying alternating current. , an electrode part (not shown) corresponding to the negative electrode part 912 may be electrically connected to the midpoint of the upper and lower arms related to the second phase of the same inverter (not shown).

Regarding each of the above embodiments, the following additional notes are further disclosed.
[Additional note 1]
A winding field type rotating electric machine,
stator and
A rotor core having a shaft portion, a rotor core coaxially fixed to the shaft portion, and a field winding wound around a plurality of teeth portions of the rotor core, and arranged coaxially with the stator and with a gap in the radial direction. a rotor that is
a rotation-side power supply device including a slip ring provided on the shaft portion so as to rotate together with the shaft portion and connected to the field winding;
a fixed-side power supply device that includes a brush that is slidable on the slip ring and supplies power to the field winding together with the rotation-side power supply device;
The fixed side power supply device is
one or more first brushes on the positive electrode side or the first phase side;
one or more second brushes on the negative electrode side or second phase side that are arranged at different angular positions from each of the first brushes around the motor shaft;
a holder that holds one or more of the first brushes and one or more of the second brushes and is formed of a material having lower conductivity than the conductor;
a first wiring part provided in the holder and for electrically connecting one or more of the first brushes to a first electrode part from a power source;
a second wiring section provided on the holder for electrically connecting the one or more second brushes to a second electrode section from a power source; and a second wiring section for fixing the one or more first brushes to the holder. a conductive first fixing member;
a conductive second fixing member for fixing one or more of the second brushes to the holder;
One or more of the first brushes do not overlap with one or more of the second brushes, the second fixing member, and the second wiring section when viewed in the motor axial direction, or The overlapping region when viewed from above is electrically insulated via the material of the holder or another insulating material, and
One or more of the second brushes do not overlap with one or more of the first brushes, the first fixing member, and the first wiring section when viewed in the motor axial direction, or The wire-wound field type rotating electric machine is electrically insulated through the material of the holder or other insulating material in the overlapping region when viewed from above.
[Additional note 2]
The holder includes a first holder member that holds one or more of the first brushes and to which the first wiring part is attached, and a first holder member that holds one or more of the second brushes and to which the second wiring part is attached. a second holder member;
The wire-wound field type rotating electric machine according to Supplementary Note 1, wherein the first holder member and the second holder member are overlapped in the motor axial direction.
[Additional note 3]
The first holder member to which the first wiring part is attached and the second holder member to which the second wiring part is attached are common parts, and are angularly shifted from each other around the motor axis. The wire-wound field type rotating electric machine according to supplementary note 2, which are overlapped.
[Additional note 4]
The wire-wound field type rotating electrical machine according to appendix 3, wherein the first holder member and the second holder member have positioning portions that determine the angular relationship.
[Additional note 5]
The first fixing member and the second fixing member each include one or more rivets or fastening members,
Supplementary Notes 2 to 4, wherein the first holder member and the second holder member have counterbore portions on opposing surfaces in the motor axial direction that prevent one or more of the rivets or the fastening members from protruding from the surfaces. The wire-wound field type rotating electric machine according to any one of the above.
[Additional note 6]
The first wiring section includes a first bus bar,
The second wiring section includes a second bus bar,
The one or more rivets or the fastening member related to the first fixing member fix the one or more first brushes to the holder together with the first bus bar,
The winding field according to appendix 5, wherein the one or more rivets or the fastening member related to the second fixing member fixes the one or more second brushes to the holder together with the second bus bar. Rotating electric machine.
[Additional note 7]
A fixed side power supply device for a wound field type rotating electric machine,
one or more first brushes on the positive electrode side or the first phase side;
one or more second brushes on the negative electrode side or second phase side that are arranged at different angular positions from each of the first brushes around the motor shaft;
a holder that holds one or more of the first brushes and one or more of the second brushes and is formed of a material having lower conductivity than the conductor;
a first wiring part provided in the holder and for electrically connecting one or more of the first brushes to a first electrode part from a power source;
a second wiring section provided on the holder for electrically connecting the one or more second brushes to a second electrode section from a power source; and a second wiring section for fixing the one or more first brushes to the holder. a conductive first fixing member;
a conductive second fixing member for fixing one or more of the second brushes to the holder;
One or more of the first brushes do not overlap with one or more of the second brushes, the second fixing member, and the second wiring section when viewed in the motor axial direction, or The overlapping region when viewed from above is electrically insulated via the material of the holder or another insulating material, and
One or more of the second brushes do not overlap with one or more of the first brushes, the first fixing member, and the first wiring section when viewed in the motor axial direction, or The power supply device is electrically insulated through the material of the holder or other insulating material in the overlapping region when viewed from above.

2B... High voltage battery (DC power supply), 3... Rotating electrical machine (wound field type rotating electrical machine), 320... Stator, 310... Rotor, 312... Rotor core, 3122... Teeth Part, 314... Shaft part, 316... Rotor winding (field winding), 7... Rotating side power supply device, 8, 8A... Power supply device (fixed side power supply device), 81 ... Positive electrode side brush (first brush), 82... Negative electrode side brush (second brush), 83, 83A... Brush holder (holder), 831... Positive electrode side holder member (first holder member) ), 8310... Attachment hole (first attachment hole), 83101... Counterbore portion, 832... Negative electrode side holder member (second holder member), 8320... Attachment hole (second attachment hole) , 83201... Counterbore part, 91... Positive electrode side wiring part (first wiring part), 910... Positive electrode side bus bar (first bus bar), 912... Positive electrode side part (first electrode part) ), 92... Negative electrode side wiring section (second wiring section), 920... Negative electrode side bus bar (second bus bar), 922... Negative electrode side electrode section (second electrode section), 918... Conductive Member (first conductive member), 928... Conductive member (second conductive member), 101... Positive electrode side fixing member (first fixing member), 1012... Rivet, 102... Negative electrode side fixing member (second fixing member), 1022... rivet, I... rotating shaft (motor shaft)

Claims

A winding field type rotating electric machine,
stator and
A rotor core having a shaft portion, a rotor core coaxially fixed to the shaft portion, and a field winding wound around a plurality of teeth portions of the rotor core, and arranged coaxially with the stator and with a gap in the radial direction. a rotor that is
a rotation-side power supply device including a slip ring provided on the shaft portion so as to rotate together with the shaft portion and connected to the field winding;
a fixed-side power supply device that includes a brush that is slidable on the slip ring and supplies power to the field winding together with the rotation-side power supply device;
The fixed side power supply device is
one or more first brushes on the positive electrode side or the first phase side;
one or more second brushes on the negative electrode side or second phase side that are arranged at different angular positions from each of the first brushes around the motor shaft;
a first holder member that holds one or more of the first brushes and is formed of an insulating material;
a second holder member that holds one or more of the second brushes and is formed of an insulating material;
a first bus bar provided on the first holder member for electrically connecting one or more of the first brushes to a first electrode part from a power source;
a second bus bar provided on the second holder member for electrically connecting the one or more second brushes to a second electrode part from a power source;
a conductive first fixing member for fixing one or more of the first brushes to the first holder member;
a conductive second fixing member for fixing one or more of the second brushes to the second holder member;
a first conductive member having one end joined to the first brush and the other end joined to the first bus bar;
a second conductive member having one end joined to the second brush and the other end joined to the second bus bar;
A first mounting hole for fixing the first fixing member is formed in the first holder member so as to penetrate in the motor axial direction,
A second mounting hole for fixing the second fixing member is formed in the second holder member so as to penetrate in the motor axial direction,
The first holder member and the second holder member are arranged in a wire-wound field type rotation system that is overlapped in the motor axial direction in such a manner that the first mounting hole and the second mounting hole do not overlap when viewed in the motor axial direction. Electric machine.
The one or more first brushes do not overlap the one or more second brushes, the second fixing member, the second conductive member, and the second bus bar when viewed in the motor axial direction, or , regions that overlap when viewed in the motor axial direction are electrically insulated via the material of the first holder member or another insulating material, and
The one or more second brushes do not overlap the one or more first brushes, the first fixing member, the first conductive member, and the first bus bar when viewed in the motor axial direction, or 2. The wire-wound field type rotating electrical machine according to claim 1, wherein regions overlapping when viewed in the axial direction of the motor are electrically insulated via the material of the second holder member or another insulating material.
The wound field type rotating electric machine according to claim 1, wherein the first holder member and the second holder member are common parts and are overlapped with each other in an angular relationship shifted around the motor axis.
The wire-wound field type rotating electric machine according to claim 3, wherein the first holder member and the second holder member have positioning portions that determine the angular relationship.
the first fixing member includes one or more rivets or fastening members fixed to the first holder member through the first attachment hole;
the second fixing member includes one or more rivets or fastening members fixed to the second holder member through the second attachment hole;
The first holder member has one or more of the rivets or the fastening member passing through the first mounting hole on a side of the first mounting hole that faces the second holder member in the motor axial direction. and a counterbore portion that does not protrude from the surface of the side facing the second holder member,
The second holder member has one or more of the rivets or the fastening member passing through the second mounting hole on a side of the second mounting hole that faces the first holder member in the motor axial direction. The wire-wound field type rotating electric machine according to any one of claims 1 to 4, further comprising a counterbore portion that does not protrude from the surface of the side facing the first holder member.
The one or more rivets or the fastening member related to the first fixing member fix the one or more first brushes together with the first bus bar to the first holder member,
The one or more rivets or the fastening member related to the second fixing member fix the one or more second brushes to the second holder member together with the second bus bar. Winding field type rotating electric machine.
A fixed-side power supply device for a wound field type rotating electric machine,
one or more first brushes on the positive electrode side or the first phase side;
one or more second brushes on the negative electrode side or second phase side that are arranged at different angular positions from each of the first brushes around the motor shaft;
a first holder member that holds one or more of the first brushes and is formed of an insulating material;
a second holder member that holds one or more of the second brushes and is formed of an insulating material;
a first bus bar provided on the first holder member for electrically connecting one or more of the first brushes to a first electrode part from a power source;
a second bus bar provided on the second holder member for electrically connecting the one or more second brushes to a second electrode part from a power source;
a conductive first fixing member for fixing one or more of the first brushes to the first holder member;
a conductive second fixing member for fixing one or more of the second brushes to the second holder member;
a first conductive member having one end joined to the first brush and the other end joined to the first bus bar;
a second conductive member having one end joined to the second brush and the other end joined to the second bus bar;
A first mounting hole for fixing the first fixing member is formed in the first holder member so as to penetrate in the motor axial direction,
A second mounting hole for fixing the second fixing member is formed in the second holder member so as to penetrate in the motor axial direction,
In the power supply device, the first holder member and the second holder member are overlapped in the motor axis direction in such a manner that the first attachment hole and the second attachment hole do not overlap when viewed in the motor axis direction.