Winding field type rotary electric machine and power supply device

Abstract

To appropriately ensure electrical insulation between power supply configurations arranged on both sides of a holder.SOLUTION: A winding field type rotary electric machine includes: a rotor; a stator; and a fixing-side power supply device. The power supply device includes: first and negative-side brushes; a holder for holding the first brush and a second brush; first and second wiring parts provided in the holder; a conductive first fixing member for fixing the first brush to the holder; and a conductive second fixing member for fixing the second brush to the holder. The first brush does not overlap the second brush, the second fixing member and the second wiring part when viewed in a motor axial direction or is electrically insulated via a material of the holder or the like, the second brush does not overlap the first brush, the first fixing member and the first wiring part when viewed in the motor axial direction or is electrically insulated via the material of the holder of the like.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present disclosure relates to a wound-field rotating electrical machine and a power supply device.

Background Art

[0002] A technique is known in which a power supply configuration including a positive electrode side brush is disposed on one surface of a holder formed of an electrical insulating material such as resin, and a power supply configuration including a negative electrode side brush is disposed on the other surface of the holder.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the conventional technology as described above, due to holes for fixing members (for example, rivet holes for rivets) for fixing the components of the power supply configuration to the holder, it is difficult to appropriately ensure electrical insulation between the positive electrode side power supply configuration and the negative electrode side power supply configuration. Such a problem also occurs in a configuration in which a polyphase alternating current is supplied to a 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 another phase.

[0005] Therefore, on one aspect, an object of the present disclosure is to appropriately ensure electrical insulation between power supply configurations disposed on both sides of a holder.

Means for Solving the Problems

[0006] On one aspect, a wound-field rotating electrical machine, a stator, A rotor having a shaft portion, a rotor core coaxially fixed to the shaft portion, and a field winding wound around a plurality of tooth portions of the rotor core, the rotor being arranged coaxially with the stator and having a gap in the radial direction, A power supply device on the rotating side provided on the shaft portion so as to rotate integrally with the shaft portion and including a slip ring connected to the field winding, A power supply device on the fixed side including a brush slidable on the slip ring and supplying power to the field winding together with the power supply device on the rotating side, The fixed-side power supply device 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 the second phase side arranged at an angular position different 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 a conductor, A first wiring portion provided on the holder for electrically connecting one or more of the first brushes to a first electrode portion from a power source, A second wiring portion provided on the holder for electrically connecting one or more of the second brushes to a second electrode portion from a power source, A conductive first fixing member for fixing one or more of the first brushes to the holder, 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 portion when viewed in the motor shaft direction, or in a region where they overlap when viewed in the motor shaft direction, they are 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 portion when viewed in the motor shaft direction, or in a region where they overlap when viewed in the motor shaft direction, they are electrically insulated via the material of the holder or another insulating material. A wound-field rotating electric machine is provided.

Advantages of the Invention

[0007] On one side, according to the present disclosure, it becomes possible to appropriately ensure electrical insulation between the power supply configurations arranged on both sides of the holder.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 8A

Figure 9

Figure 9A

Figure 10

Figure 11

Modes for Carrying Out the Invention

[0009] Hereinafter, each embodiment will be described in detail with reference to the attached drawings. Note that the dimensional ratios in the drawings are merely examples and are not limited thereto, and the shapes and the like in the drawings may be exaggerated partially for the convenience of explanation.

[0010] 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 electrical machine 3 (a cross-section cut by a plane including the rotation axis I). FIG. 3 is a schematic cross-sectional view showing a part of the cross-section of the rotating electrical machine 3 (a cross-section along line A-A in FIG. 2). In FIG. 2, an X direction along the rotation axis I and X1 side and X2 side are defined. Also, in FIGS. 1 and 2, a power supply device 7 on the rotating side and a power supply device 8 on the fixed side are schematically shown, but the detailed configuration of the power supply device 8 on the fixed side will be described later with reference to FIGS. 4 and later.

[0011] The vehicle drive system 1 has a two-power-source configuration including a low-voltage battery 2A and a high-voltage battery 2B, and includes a rotating electrical machine 3 and a drive device 5.

[0012] The low-voltage battery 2A is, for example, a lead battery, and the rated voltage is, for example, 12V.

[0013] The high-voltage battery 2B is, for example, a lithium-ion battery, and has a significantly higher rated voltage than the low-voltage battery 2A, for example, the rated voltage is 40V or more. In this embodiment, as an example, it is assumed that the rated voltage of the high-voltage battery 2B is 300V or more. Note that the high-voltage battery 2B may be in the form of a fuel cell or the like.

[0014] The rotating electrical machine 3 is a wound-field rotating electrical machine. Specifically, the rotating electrical machine 3 is a wound-field type including a power supply device 7 on the rotating side and a power supply device 8 on the fixed side, and includes a rotor 310 and a stator 320. The rotor 310 is arranged coaxially with the stator 320 and with a gap in the radial direction inside the radial direction of the stator 320. The rotor 310 has a rotor core 312, a shaft portion 314, and a rotor winding 316. The rotor core 312 is fixed coaxially 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 tooth portions 3122 protruding outward in the radial direction, and conductor wires forming the rotor winding 316 are wound around the tooth portions 3122. The stator winding 322 is wound around the tooth portions 3210 of the stator core 321 as shown in FIG. 3.

[0015] The rotor winding 316 has lead wires 3161 and 3162 that are electrically connected to a power supply device 7 on the rotating side including a positive electrode side slip ring 71 and a positive electrode side brush 81 described later. Note that the lead wires 3161 and 3162 extend axially outside the coil ends of the rotor winding 316 (portions protruding axially outside the end face of the rotor core 312) and may be part of the rotor winding 316.

[0016] The drive device 5 includes a microcomputer 50 (hereinafter referred to as "microcontroller 50") and an electric circuit unit 60.

[0017] The microcontroller 50 may be realized as, for example, an ECU (Electronic Control Unit). The microcontroller 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).

[0018] The microcontroller 50 receives various commands such as control commands from a higher-level ECU (not shown) via the network 6. The microcontroller 50 controls the rotating electrical machine 3 via the electric circuit unit 60 based on the control command.

[0019] The electric circuit unit 60 includes a smoothing capacitor 62, a power conversion circuit unit 63, and a power supply circuit unit 64.

[0020] The smoothing capacitor 62 is provided between the high-potential line 20 and the low-potential 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.

[0021] The power conversion circuit unit 63 is in the form of an inverter and forms, for example, a three-phase bridge circuit. The power conversion circuit unit 63 is connected between the high-potential line 20 and the low-potential line 22 in a manner parallel to the smoothing capacitor 62. The power conversion circuit unit 63 includes each switching element SW3 of the high-potential arm and each switching element SW4 of the low-potential arm. In this case, the microcomputer 50 may control the energization of the stator winding 322 by controlling the on / off states of each switching element SW3, SW4 of the power conversion circuit unit 63 via the gate driver circuit 52.

[0022] The power supply circuit unit 64 includes a bridge circuit unit 641 and a drive circuit unit 642.

[0023] The bridge circuit unit 641 is connected between the high-potential line 20 and the low-potential line 22 in a manner parallel to the smoothing capacitor 62 and the resistor R0 for passive discharge. The bridge circuit unit 641 includes a pair of switching elements SW1, SW2 and a pair of diodes D1, D2.

[0024] The switching element SW1 is connected in series with the diode D1 in a manner that it is connected to the cathode on the high potential side of the diode D1. Between the switching element SW1 and the diode D1, the positive electrode side end of the rotor winding 316 is electrically connected via the positive electrode side slip ring 71 and the positive electrode side brush 81, which will be described later. Also, the switching element SW2 is connected in series with the diode D2 in a manner that it is connected to the anode on the low potential side of the diode D2. Between the switching element SW2 and the diode D2, the negative electrode side end of the rotor winding 316 is electrically connected via the negative electrode side slip ring 72 and the negative electrode side brush 82, which will be described later.

[0025] The pair of switching elements SW1 and SW2 have their on / off states switched via the drive circuit unit 642. The pair of switching elements SW1 and SW2 change the energization state with respect to the rotor winding 316 under the control of the drive circuit unit 642. The switching elements SW1 and SW2 are, for example, IGBTs (Insulated Gate Bipolar Transistors), but may be in other forms such as MOSFETs (Metal Oxide Semiconductor Field-Effect Transistors).

[0026] The drive circuit unit 642 drives the gates of the switching element SW1 and the switching element SW2 based on the control signal from the microcomputer 50.

[0027] Next, while appropriately referring to FIG. 2 and referring to FIGS. 4 and later, the characteristic configuration of this embodiment will be described.

[0028] In the following description, the axial direction refers to the direction (X direction) in which the rotation axis I of the rotating electrical machine 3 extends, and the radial direction refers to the radial direction centered on the rotation axis I. Therefore, the outer side in the radial direction refers to the side away from the rotation axis I, and the inner side in the radial direction refers to the side toward the rotation axis I. Also, the outer side in the axial direction refers to the side away from the axial center of the stator 320, and the inner side in the axial direction refers to the side approaching the axial center of the stator 320. Also, the circumferential direction corresponds to the rotational direction around the rotation axis I.

[0029] FIG. 4 is a perspective view showing an example of the power supply device 8 on the fixed side (hereinafter also simply referred to as the "power supply device 8"). FIG. 5 is a plan view showing the positive electrode side structure disposed on the X1 side of the brush holder 83 of the power supply device 8. FIG. 6 is a plan view showing a part of the configuration on the X1 side in a perspective view (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 when cut along the plane of line B-B in FIG. 6. FIG. 8 is a cross-sectional view of the power supply device 8 when cut along the plane of line C-C in FIG. 6. FIG. 8A is a perspective view showing the positioning portion 8319 locally.

[0030] 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 electrode side brush 81, a negative electrode side brush 82, a brush holder 83, a positive electrode side wiring portion 91, a negative electrode side wiring portion 92, a positive electrode side fixing member 101, and a negative electrode side fixing member 102.

[0031] As schematically shown in FIG. 2, the positive electrode side brush 81 is disposed slidably with respect to the positive electrode side slip ring 71 in such a manner that the radially inner end abuts against the positive electrode side slip ring 71 of the power supply device 7 on the rotating side in the radial direction. 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 radially inward by an elastic member (not shown).

[0032] As schematically shown in Fig. 2, the negative electrode side brush 82 is arranged to be slidable with respect to the negative electrode side slip ring 72 in such a manner that the radially inner end thereof abuts against the negative electrode side slip ring 72 of the rotating power supply device 7 in the radial direction. 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 electrode side brushes 82 may be provided around the rotation axis I in such a manner that their phases are shifted by 60 degrees with respect to the above-described three positive electrode side brushes 81 respectively. The negative electrode side brush 82 may be urged radially inward by an elastic member (not shown).

[0033] The brush holder 83 is formed of a material having lower conductivity than that of a conductor. The brush holder 83 may be formed of, for example, a resin material. The brush holder 83 is provided around the positive electrode side slip ring 71 and the negative electrode side slip ring 72 of the rotating power supply device 7. 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.

[0034] The brush holder 83 holds the positive electrode side brush 81 and the negative electrode side brush 82. In this embodiment, the positive electrode side brush 81 is arranged on the surface on the X1 side of the brush holder 83, and the negative electrode side brush 82 is arranged on the surface on the X2 side of the brush holder 83. However, in a modified example, the positive and negative arrangements may be reversed. Specifically, the positive electrode side brush 81 may be arranged on the surface on the X2 side, and the negative electrode side brush 82 may be arranged on the surface on the X1 side.

[0035] 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, namely a positive electrode side holder member 831 and a negative electrode side holder member 832. In this case, the positive electrode side brush 81 is attached to the positive electrode side holder member 831 by a positive electrode side fixing member 101 described later, and the negative electrode side brush 82 is attached to the negative electrode side holder member 832 by a negative electrode side fixing member 102 described later. For this purpose, as shown in FIG. 7, the positive electrode side holder member 831 is provided with a mounting hole 8310 for the rivet 1012, and the negative electrode side holder member 832 is provided with a mounting hole 8320 for the rivet 1022.

[0036] The positive electrode side holder member 831 has a counterbore portion 83101 on the X2 side of the mounting hole 8310 so that the rivet 1012 does not protrude from the surface (the back surface) on the X2 side 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 mounting hole 8320 so that the rivet 1022 does not protrude from the surface (the back surface) on the X1 side of the negative electrode side holder member 832 to the X1 side. The technical significance of such counterbore portions 83101 and 83201 will be described later.

[0037] In this embodiment, as a preferred 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 the back surfaces of each other in the axial direction. Specifically, the positive electrode side holder member 831 is overlapped with the negative electrode side holder member 832 in such a manner that the surface on the X2 side is joined to 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 by an angle 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 overlapped with each other in an angular relationship shifted by 60 degrees around the rotation axis I (hereinafter, also referred to as "normal 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 of a common component, the manufacturing cost can be reduced.

[0038] The positive electrode side holder member 831 and the negative electrode side holder member 832 preferably have positioning portions 8319 and 8329 so that the above-described normal angular relationship (an angular relationship shifted by 60 degrees around the rotation axis I) can be easily realized. In this embodiment, the positive electrode side holder member 831 and the negative electrode side holder member 832 have the same form, and therefore, the positioning portions 8319 and 8329 also have the same form. Specifically, as shown in FIG. 8A, the positioning portion 8319 (the same applies to the positioning portion 8329) has a concave-convex form formed by a concave portion 83190 and a convex portion 83191. The positioning portions 8319 and 8329 are formed such that the convex portion 83291 and the concave portion 83290 of the positioning portion 8329 fit into the concave portion 83190 and the convex portion 83191 of the positioning portion 8319 (see FIG. 8) only when the angular relationship between the positive electrode side holder member 831 and the negative electrode side holder member 832 is the normal angular relationship.

[0039] The positive electrode side wiring portion 91 is a wiring portion for electrically connecting the positive electrode side brush 81 to the positive electrode of the high-voltage battery 2B. One end is connected to the positive electrode side brush 81, and the other end is connected to the positive electrode side electrode portion 912. The positive electrode side wiring portion 91 is attached to the surface on the X1 side of the positive electrode side holder member 831.

[0040] The negative electrode side wiring portion 92 is a wiring portion for electrically connecting the negative electrode side brush 82 to the negative electrode of the high-voltage battery 2B. One end is connected to the negative electrode side brush 82, and the other end is connected to the negative electrode side electrode portion 922. The negative electrode side wiring portion 92 is attached to the surface on the X2 side of the negative electrode side holder member 832.

[0041] More specifically, the positive electrode side wiring portion 91 may include, for example, a positive electrode side bus bar 910 extending in a plane perpendicular to the axial direction. The positive electrode side bus bar 910 is a plate-shaped conductor and is provided on the surface on the X1 side of the positive electrode side holder member 831 in a manner passing below the radially outer ends of the three positive electrode side brushes 81. Similarly, the negative electrode side wiring portion 92 includes, for example, a negative electrode side bus bar 920 extending in a plane perpendicular to the axial direction and is provided on the surface on the X2 side of the negative electrode side holder member 832 in a manner passing below the radially outer ends of the three negative electrode side brushes 82.

[0042] In this embodiment, as described above, corresponding to the fact that 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 portion 91 and the negative electrode side wiring portion 92 preferably has the same form. In this case, the positive electrode side holder member 831 to which the positive electrode side wiring portion 91 is attached and the negative electrode side holder member 832 to which the negative electrode side wiring portion 92 is attached have the same form, and it is possible to reduce the manufacturing cost while reducing the variation of parts. 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 above-described regular angular relationship (an angular relationship shifted by 60 degrees around the rotation axis I).

[0043] The positive electrode side wiring portion 91 may be electrically connected to the positive electrode side brush 81 by the positive electrode side bus bar 910 contacting the positive electrode side fixing member 101 (fixing bracket 1010) described later. Alternatively, the positive electrode side wiring portion 91 may include another conductor wire (not shown) whose one end (for example, the end face on the radially outer side) is joined to the positive electrode side brush 81 and the other end is joined to the positive electrode side bus bar 910. The same applies to the negative electrode side wiring portion 92.

[0044] 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). In this embodiment, as an example, it includes a fixing bracket 1010 and a rivet 1012. The fixing bracket 1010 has a hat-shaped cross-section and extends so as to cover three of the four side surfaces of the positive electrode side brush 81, and has through holes 10110 (see FIG. 7) through which the rivet 1012 passes in the leg portions 1011 on both sides. The 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 fixing bracket 1010, but the number is arbitrary.

[0045] 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). In this embodiment, as an example, it includes a fixing bracket 1020 and a rivet 1022. The fixing bracket 1020 has a hat-shaped cross-section and extends so as to cover three of the four side surfaces of the negative electrode side brush 82, and the both side leg portions 1021 have through holes 10210 (see FIG. 7) through which the rivets 1022 pass. The 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 fixing bracket 1020, but the number is arbitrary.

[0046] In this embodiment, each rivet 1012 related to the positive electrode side fixing member 101 fixes each positive electrode side brush 81 to the surface on the X1 side 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 related to the positive electrode side fixing member 101 may fix each positive electrode side brush 81 together with the positive electrode side wiring portion 91 to the surface on the X1 side of the positive electrode side holder member 831. In this case, as shown in FIG. 7, the fixing bracket 1010 is overlapped in such a manner that the leg portions 1011 on both sides rest on the surface on the X1 side of the positive electrode side wiring portion 91 and is fixed by the rivets 1012. For this purpose, through holes 914 (see FIG. 7) through which the rivets 1012 pass are also formed in the positive electrode side bus bar 910 of the positive electrode side wiring portion 91.

[0047] Similarly, each rivet 1022 related to the negative electrode side fixing member 102 fixes each negative electrode side brush 82 to the surface on the X2 side 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 portion 92 to the surface on the X2 side of the negative electrode side holder member 832. In this case, as shown in FIG. 7, the fixing bracket 1020 is overlapped in such a manner that the leg portions 1021 on both sides rest on the surface on the X2 side of the negative electrode side wiring portion 92 and is fixed by the rivet 1022. For this purpose, a through hole 924 (see FIG. 7) through which the rivet 1022 passes is also formed in the negative electrode side bus bar 920 of the negative electrode side wiring portion 92.

[0048] FIG. 9 is an explanatory diagram of the power supply device 8' according to the comparative example, and is a view showing the same view as FIG. 6.

[0049] In the power supply device 8' according to the comparative example shown in FIG. 9, the rivet 1024 for fixing the negative electrode side bus bar 920 of the negative electrode side wiring portion 92 to the brush holder 83' is set separately from the fixing member for fixing each negative electrode side brush 82 to the brush holder 83'. Such a configuration is the same as the configuration described in Patent Document 1 above, and is hereinafter also simply referred to as "comparative example". In the comparative example, similarly for the positive electrode side, the rivet for fixing the positive electrode side wiring portion 91 to the brush holder 83' is set separately from the fixing member for fixing each positive electrode side brush 81 to the brush holder 83'. In the present embodiment, compared with such a comparative example, an efficient fixing method can be realized, for example, the number of rivets can be reduced.

[0050] Next, while continuing to refer to FIGS. 4 to 9, the characteristic configuration of the present embodiment related to the electrical insulation between the positive electrode side and the negative electrode side will be described with reference to FIGS. 9A and 10.

[0051] FIG. 9A is a cross-sectional view taken along line D-D of FIG. 9. FIG. 10 is a cross-sectional view taken along line E-E of FIG. 6. In FIG. 10, for the sake of illustration, unlike the above-mentioned FIG. 7, the shapes of the rivets 1012 and 1022 are schematically shown, and the illustration of the configuration of the X1-side surface of the positive electrode side holder member 831 and the configuration of the X2-side surface of the negative electrode side holder member 832 are omitted.

[0052] Here, as described above in the column of "Problems to be Solved by the Invention", in the comparative example (for example, the configuration described in Patent Document 1 above), it is difficult to appropriately ensure the electrical insulation between the power supply configuration on the positive electrode side and the power supply configuration on the negative electrode side. 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 portion 92 to the brush holder 83' is provided at a position overlapping the positive electrode side brush 81 when viewed in the axial direction. In this case, it is difficult to appropriately ensure the electrical insulation between the conductive rivet 1024 and the positive electrode side brush 81. As a result, it becomes difficult to appropriately ensure the electrical insulation between the positive electrode side brush 81 and the power supply configuration on the negative electrode side. This is the same for the electrical insulation between the power supply configuration on the positive electrode side and the negative electrode side brush 82.

[0053] On the other hand, in the present embodiment, each positive electrode side brush 81 does not overlap with each negative electrode side brush 82, the negative electrode side fixing member 102, and the negative electrode side wiring portion 92 when viewed in the axial direction, or even in the overlapping region when viewed in the axial direction, it is electrically insulated through the material of the brush holder 83 (a material having lower conductivity than a conductor, and in this embodiment, a resin material).

[0054] Specifically, each positive electrode side brush 81 is out of phase with each negative electrode side brush 82 and does not overlap when viewed in the axial direction. Further, each positive electrode side brush 81 also does not overlap with the negative electrode side fixing member 102 when viewed in the axial direction. This is in contrast to the above-described comparative example. Also, in the present embodiment, due to the fact that the negative electrode side bus bar 920 is in a C-shaped form when viewed in the axial direction, one of the three positive electrode side brushes 81 does not overlap with the negative electrode side wiring portion 92 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 portion 92 when viewed in the axial direction, but in this region, the two of the three positive electrode side brushes 81 are electrically insulated from the negative electrode side wiring portion 92 through the material of the brush holder 83. That is, as shown in FIG. 7, the material of the brush holder 83 is interposed between each positive electrode side brush 81 and the negative electrode side wiring portion 92. Thereby, the electrical insulation between the positive electrode side brush 81 and the power supply configuration on the negative electrode side can be appropriately ensured.

[0055] Similarly, each negative electrode side brush 82 does not overlap with each positive electrode side brush 81, the positive electrode side fixing member 101, and the positive electrode side wiring portion 91 when viewed in the axial direction, or is electrically insulated through the material of the brush holder 83 even in a region that overlaps when viewed in the axial direction.

[0056] Specifically, each negative electrode side brush 82 is out of phase with each positive electrode side brush 81 and does not overlap when viewed in the axial direction. Also, each negative electrode side brush 82 does not overlap with the positive electrode side fixing member 101 when viewed in the axial direction. This is in contrast to the above-described comparative example. Further, in the present embodiment, due to the fact that the positive electrode side bus bar 910 is in a C-shaped form when viewed in the axial direction, one of the three negative electrode side brushes 82 does not overlap with the positive electrode side wiring portion 91 when viewed in the axial direction. On the other hand, two of the three negative electrode side brushes 82 have a region that overlaps with the positive electrode side wiring portion 91 when viewed in the axial direction, but in this region, the two of the three negative electrode side brushes 82 are electrically insulated from the positive electrode side wiring portion 91 via the material of the brush holder 83. That is, as shown in FIG. 7, the material of the brush holder 83 is interposed between each negative electrode side brush 82 and the positive electrode side wiring portion 91. Thereby, appropriate electrical insulation between the negative electrode side brush 82 and the positive electrode side power supply configuration can be ensured.

[0057] Also, in the present embodiment, unlike the above-described comparative example, the positive electrode side bus bar 910 is not fixed to the positive electrode side holder member 831 by a rivet such as the rivet 1024 in the region that overlaps with the negative electrode side brush 82 in the axial direction (i.e., the back side of the negative electrode side brush 82). Similarly, in the present embodiment, the negative electrode side bus bar 920 is not fixed to the negative electrode side holder member 832 by a rivet such as the rivet 1024 in the region that overlaps with the positive electrode side brush 81 in the axial direction (i.e., the back side of the positive electrode side brush 81). Thereby, the inconvenience caused by such a rivet 1024 (the inconvenience described with reference to FIG. 9A) does not occur.

[0058] Also, according to this embodiment, as described above, the positive electrode side holder member 831 has a counterbore portion 83101 on the X2 side of the mounting hole 8310, and the negative electrode side holder member 832 has a counterbore portion 83201 on the X1 side of the mounting hole 8320. By having such counterbore portions 83101 and 83201, as schematically shown by the arrow R10 in FIG. 10, the creepage distance between the positive electrode side rivet 1012 and the negative electrode side rivet 1022 can be efficiently increased. As a result, appropriate electrical insulation between the conductive positive electrode side rivet 1012 and the conductive negative electrode side rivet 1022 can be ensured.

[0059] Also, 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 and the negative electrode side holder member 832 can be assembled in such a manner that the counterbore portion 83101 of the positive electrode side holder member 831 is covered 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. Therefore, the portion of the rivet 1012 located in the counterbore portion 83101 of the positive electrode side holder member 831 will not be visible from the X2 side surface of the negative electrode side holder member 832. Also, the portion of the rivet 1022 located in the counterbore portion 83201 of the negative electrode side holder member 832 will not be visible from the X1 side surface of the positive electrode side holder member 831. Therefore, according to this embodiment, inconveniences (for example, the possibility that the electrical insulation is impaired due to such foreign matter) caused by the accumulation of foreign matter (for example, wear powder of the positive electrode side brush 81 or the negative electrode side brush 82) in the counterbore portions 83201 and 83201 can also be reduced.

[0060] Although each embodiment has been described in detail above, it is not limited to a specific embodiment, and various modifications and changes are possible within the scope described in the claims. Also, it is possible to combine all or a plurality of the components of the above-described embodiments.

[0061] For example, in the above-described embodiment, the rotating electrical machine 3 is for the vehicle drive system 1. However, the technology according to this embodiment is applicable not only to the wound field type rotating electrical machine for other in-vehicle uses but also to the wound field type rotating electrical machine used in various fields other than in-vehicle applications.

[0062] Also, in the above-described embodiment, the positive brush 81 that overlaps the negative electrode side wiring portion 92 when viewed in the axial direction is electrically insulated from the negative electrode side wiring portion 92 through the material of the brush holder 83. However, the positive brush 81 that overlaps the negative electrode side wiring portion 92 when viewed in the axial direction may be made of a material different from that of the brush holder 83 and may be electrically insulated from the negative electrode side wiring portion 92 through another insulating material. The same applies to the negative brush 82 that overlaps the positive electrode side wiring portion 91 when viewed in the axial direction. For example, in the power supply device 8A shown in FIG. 11, although it has the same structure as the above-described comparative example, the end portion of the rivet 1024 (the end portion closer to the negative electrode side) is covered with the insulating member 1025. That is, the rivet hole 1024A is blocked by the insulating member 1025. In this case, the positive electrode side bus bar 910A of the positive electrode side wiring portion 91A of the power supply device 8A may have a hole 916A or notch for assembling the insulating member 1025. Even with such a power supply device 8A, the same effects as those of the above-described embodiment can be obtained. The power supply device 8A has a one-piece brush holder 83A (similar to the brush holder 83' according to the comparative example) instead of the brush holder 83, but it may have the same brush holder 83 as in this embodiment.

[0063] Also, in the above-described embodiment, the rivets 1012 and 1022 are used as fixing members, but instead, fastening members such as bolts and nuts may be used.

[0064] In addition, in the above-described embodiment, a direct current is applied to the rotor winding 316. However, the present invention is also applicable to a configuration in which an alternating current is applied to the rotor winding (for example, a configuration disclosed in JP-A-2012-222843). In this case, for example, with respect to any two of the three phases, the configuration of the above-described embodiment may be applied. In this case, the configuration related to the first phase may be substantially the same as the above-described configuration on the positive electrode side (the positive electrode side holder member 831, the positive electrode side brush 81, etc.), and the configuration related to the second phase may be substantially the same as the above-described configuration on the negative electrode side (the negative electrode side holder member 832, the negative electrode side brush 82, etc.). Further, in this case, an electrode portion (not shown) corresponding to the positive electrode side electrode portion 912 may be electrically connected to the midpoint of the upper and lower arms related to the first phase in an inverter (not shown) for applying an alternating current, and an electrode portion (not shown) corresponding to the negative electrode side electrode portion 912 may be electrically connected to the midpoint of the upper and lower arms related to the second phase in the same inverter (not shown).

Explanation of Signs

[0065] 2B... High-voltage battery (DC power source), 3... Rotating electrical machine (wound field rotating electrical machine), 320... Stator, 310... Rotor, 312... Rotor core, 3122... Tooth portion, 314... Shaft portion, 316... Rotor winding (field winding), 7... Power feeding device on the rotating side, 8, 8A... Power feeding device (power feeding device on the fixed side), 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), 83101... Counterbore portion, 832... Negative electrode side holder member (second holder member), 83201... Counterbore portion, 91... Positive electrode side wiring portion (first wiring portion), 910... Positive electrode side bus bar (first bus bar), 912... Positive electrode side electrode portion (first electrode portion), 92... Negative electrode side wiring portion (second wiring portion), 920... Negative electrode side bus bar (second bus bar), 922... Negative electrode side electrode portion (second electrode portion), 101... Positive electrode side fixing member (first fixing member), 1012... Rivet, 102... Negative electrode side fixing member (second fixing member), 1022... Rivet, I... Rotation axis (motor axis)

Claims

1. A wound-field rotating electrical machine, comprising a stator, a shaft portion, a rotor core coaxially fixed to the shaft portion, and a field winding wound around a plurality of tooth portions of the rotor core, the rotor being arranged coaxially with the stator and having a gap in the radial direction, a rotating-side power supply device provided on the shaft portion so as to rotate integrally with the shaft portion and including a slip ring connected to the field winding, a fixed-side power supply device including a brush slidable on the slip ring and supplying power to the field winding together with the rotating-side power supply device, The fixed-side power supply device includes 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 the second phase side arranged at an angular position different 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 a lower conductivity than a conductor, a first wiring portion provided on the holder for electrically connecting one or more of the first brushes to a first electrode portion from a power source, a second wiring portion provided on the holder for electrically connecting one or more of the second brushes to a second electrode portion from a power source, and a conductive first fixing member for fixing one or more of the first brushes to the holder, 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 portion when viewed in the motor shaft direction, or, in a region where they overlap when viewed in the motor shaft direction, they are 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 portion when viewed in the motor shaft direction, or are electrically insulated through the material of the holder or other insulating material in a region where they overlap when viewed in the motor shaft direction. A wound field type rotating electric machine.

2. The holder is formed by a first holder member that holds one or more of the first brushes and to which the first wiring portion is attached, and a second holder member that holds one or more of the second brushes and to which the second wiring portion is attached. The first holder member and the second holder member are overlapped in the motor shaft direction. The wound field type rotating electric machine according to claim 1.

3. The first holder member to which the first wiring portion is attached and the second holder member to which the second wiring portion is attached are common parts and are overlapped with each other in an angular relationship shifted around the motor shaft. The wound field type rotating electric machine according to claim 2.

4. The first holder member and the second holder member have a positioning portion that determines the angular relationship. The wound field type rotating electric machine according to claim 3.

5. The first fixing member and the second fixing member each include one or more rivets or fastening members. The first holder member and the second holder member have counterbore portions on the surfaces facing each other in the motor shaft direction, and the one or more rivets or fastening members do not protrude from the surfaces. The wound field type rotating electric machine according to any one of claims 2 to 4.

6. The first wiring portion includes a first bus bar. The second wiring portion includes a second bus bar. One or more of the rivets or fastening members related to the first fixing member fix one or more of the first brushes to the holder together with the first bus bar. One or more of the rivets or fastening members according to the second fixing member fix one or more of the second brushes to the holder together with the second bus bar, the wound field type rotating electrical machine according to claim 5.

7. A fixed-side power supply device for a wound field type rotating electrical 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 the second phase side, which are arranged at angular positions different from those of the respective 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 a conductor, A first wiring portion provided on the holder for electrically connecting one or more of the first brushes to a first electrode portion from a power source, A second wiring portion provided on the holder for electrically connecting one or more of the second brushes to a second electrode portion from a power source A conductive first fixing member for fixing one or more of the first brushes to the holder, A conductive second fixing member for fixing one or more of the second brushes to the holder, and 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 portion when viewed in the motor shaft direction, or in a region where they overlap when viewed in the motor shaft direction, they are 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 portion when viewed in the motor shaft direction, or in a region where they overlap when viewed in the motor shaft direction, they are electrically insulated via the material of the holder or another insulating material, a power supply device.

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