Winding field type rotating electric machine and power supply device

Abstract

To facilitate connection between positive electrode-side and negative electrode-side slip rings and magnetic field winding of a rotor.SOLUTION: There is disclosed a winding magnetic field type rotary electric machine, wherein a rotation-side power supply device has positive electrode-side and negative electrode-side slip rings each having a toric shape around a rotor shaft, a positive electrode-side rotor connection part arranged more axially closely to a rotor than the positive electrode side and negative electrode-side slip rings, and electrically connected to the positive electrode-side slip ring and magnetic field winding, a negative electrode-side rotor connection part arranged more axially closely to the rotor than the positive electrode-side and negative electrode-side slip rings, and electrically connected to the negative electrode-side slip ring and the magnetic field winding, and a resin part uniting the positive electrode-side slip ring and rotor connection part, and the negative electrode-side slip ring and rotor connection part, and the positive electrode-side and negative electrode-side rotor connection parts each extend over an angle rnage of 90 degrees or more around the rotor shaft.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] There is known a technique in which slip rings on the positive electrode side and the negative electrode side at one axial end are each formed by an annular conductor portion, and connection terminal portions on the positive electrode side and the negative electrode side at the other axial end are formed by conductor terminals protruding radially outward, and are resin-molded.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the prior art as described above, since the connection terminal portions on the positive electrode side and the negative electrode side are arranged only at specific circumferential positions, there is a problem that the routing freedom when connecting the field windings of the rotor to each of the connection terminal portions on the positive electrode side and the negative electrode side is low. For example, when the connection terminal portion on the positive electrode side and the connection end of the field winding of the rotor are separated in the circumferential direction, it is necessary to route the wire while providing a protrusion or the like on the end plate of the rotor to apply tension to the field winding.

[0005] Therefore, in one aspect, an object of the present disclosure is to facilitate the connection between the slip rings on the positive electrode side and the negative electrode side and the field windings of the rotor.

Means for Solving the Problems

[0006] In one aspect, a wound-field rotating electrical machine, a stator, A rotor having a shaft portion, a rotor core fixed coaxially to the shaft portion, and field windings wound around a plurality of teeth portions of the rotor core, and arranged coaxially with the stator and with a radial gap between them, A power supply device on the rotating side is provided on the shaft portion so as to rotate integrally with the shaft portion, and includes a slip ring and a rotor connection portion connected to the field winding, The system includes a power control unit and a fixed power supply unit that includes a brush slidable on the slip ring and supplies power to the field winding together with the rotating power supply unit, The power supply device on the rotating side is, The slip rings on the positive and negative sides each have an annular shape around the rotor axis, The rotor connection portion on the positive side is positioned closer to the rotor in the axial direction than the slip rings on the positive and negative sides, and is electrically connected to the slip ring on the positive side and the field winding, The rotor connection portion on the negative side is positioned closer to the rotor in the axial direction than the slip rings on the positive and negative sides, and is electrically connected to the slip ring on the negative side and the field winding, It has a resin portion that integrates the slip ring and rotor connection portion on the positive electrode side with the slip ring and rotor connection portion on the negative electrode side. A wound-field rotating electric machine is provided, wherein the rotor connection portions on the positive and negative sides each extend over an angular range of 90 degrees or more around the rotor axis. [Effects of the Invention]

[0007] In one aspect, the present disclosure makes it possible to facilitate the connection between the positive and negative slip rings and the field windings of the rotor. [Brief explanation of the drawing]

[0008] [Figure 1] This is a diagram showing a vehicle drive system including a drive unit for a rotating electric machine according to this embodiment. [Figure 2]This is a schematic cross-sectional view showing a portion of the cross-section of a rotating electric machine. [Figure 3] This is a schematic cross-sectional view showing a portion of the cross-section of a rotating electric machine (a cross-section along line AA in Figure 2). [Figure 4] This is a perspective view showing an example of a power supply device for the rotating side according to Example 1. [Figure 5] This is a perspective view showing the power supply device according to Example 1, with the resin part removed, for the purpose of explaining the conductor configuration. [Figure 6] A schematic cross-sectional view of the power supply device according to Example 1, when cut through a plane passing through the rotation axis I. [Figure 7] This is a schematic cross-sectional view of the power supply device according to Example 1, when cut along a plane parallel to line BB in Figure 6. [Figure 8] This is a schematic conceptual diagram illustrating an example of the connection method and connection points for the rotor windings in the rotating power supply device according to Embodiment 1. [Figure 8A] This is a schematic conceptual diagram illustrating another example of the connection method and connection points of the rotor windings in the rotating power supply device according to Embodiment 1. [Figure 9] This is a schematic conceptual diagram illustrating yet another example of the connection method and connection points of the rotor windings in the rotating power supply device according to Embodiment 1. [Figure 10] This is a perspective view showing an example of a power supply device for the rotating side according to Example 2. [Figure 11] This is a perspective view showing the power supply device according to Example 2, with the resin part removed, for the purpose of explaining the conductor configuration. [Figure 12] A schematic cross-sectional view of the power supply device according to Example 2, when cut through a plane passing through the rotation axis I. [Figure 13] This is a schematic cross-sectional view of the power supply device according to Example 2, when cut along a plane parallel to line CC in Figure 12. [Figure 14] This is a schematic conceptual diagram illustrating an example of the connection method and connection points for the rotor windings in the rotating power supply device according to Embodiment 2. [Modes for carrying out the invention]

[0009] Hereinafter, each embodiment will be described in detail while referring 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 electric machine according to the present 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 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 electric machine 3 (a cross section along line A-A in FIG. 2). In FIG. 2, an X direction along the rotation axis I and sides X1 and X2 are defined. Further, in FIGS. 1 and 2, a power supply device 7 on the rotating side and a brush 69 (only in FIG. 1) are schematically shown, but the detailed configuration of the power supply device 7 on the rotating side will be described later by referring 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 electric 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 the present 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 electric machine 3 is a wound-field type equipped with a rotating-side power supply device 7 (described later) and brushes 69, and includes a rotor 310 and a stator 320. The rotor 310 is positioned radially inward of the stator 320, coaxially with the stator 320 and with a radial gap between them. The rotor 310 has a rotor core 312, a shaft portion 314, and rotor windings 316. The rotor core 312 is fixed coaxially to the shaft portion 314. As shown in Figure 3, the rotor core 312 has teeth portions 3122 that protrude radially outward, and the conductor wires forming the rotor windings 316 are wound around the teeth portions 3122. As shown in Figure 3, the stator windings 322 are wound around the teeth portions 3210 of the stator core 321.

[0015] The rotor winding 316 has lead wires 3161 and 3162 that are electrically connected to the rotating power supply device 7, which will be described later. The lead wires 3161 and 3162 extend axially outward from the coil end of the rotor winding 316 (the portion that protrudes axially outward from the end face of the rotor core 312) and may be part of the rotor winding 316. The end face of the rotor core 312 may be covered axially by an end plate 313. The end plate 313 may be formed from one or more members and may be in the form of an end cover that covers the entire coil end of the rotor winding 316.

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

[0017] The microcontroller 50 may be implemented 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. Based on the control commands, the microcontroller 50 controls the rotating electric machine 3 via the electrical circuit unit 60.

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

[0020] The smoothing capacitor 62 is installed 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 across the smoothing capacitor 62.

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

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

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

[0024] Switching element SW1 is connected in series with diode D1, in a manner that connects to the high-potential cathode of diode D1. The positive end of rotor winding 316 is electrically connected between switching element SW1 and diode D1 via a positive-side slip ring 71 and brush 69, which will be described later. Switching element SW2 is connected in series with diode D2, in a manner that connects to the low-potential anode of diode D2. The negative end of rotor winding 316 is electrically connected between switching element SW2 and diode D2 via a negative-side slip ring 72 and brush 69, which will be described later.

[0025] The pair of switching elements SW1 and SW2 are switched on / off via the drive circuit 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 642. The switching elements SW1 and SW2 are, for example, IGBTs (Insulated Gate Bipolar Transistors), but may also be of other forms such as MOSFETs (Metal Oxide Semiconductor Field-Effect Transistors).

[0026] The drive circuit 642 drives the gates of switching elements SW1 and SW2 based on control signals from the microcontroller 50.

[0027] Next, the characteristic configuration of this embodiment will be described with reference to Figure 4 and subsequent figures.

[0028] Figure 4 is a perspective view showing an example of a rotating power supply device 7 (hereinafter also simply referred to as "power supply device 7"). Figure 5 is a perspective view showing the power supply device 7 with the resin part 70 removed, for the purpose of explaining the conductor configuration related to the power supply device 7. Figure 6 is a schematic cross-sectional view of the power supply device 7 when cut by a plane passing through the rotation axis I, and Figure 7 is a schematic cross-sectional view of the power supply device 7 when cut by a plane along line BB in Figure 6.

[0029] The power supply device 7 has a resin part 70 made of an insulating material such as resin. The resin part 70 is cylindrical in shape overall and may be fitted onto the shaft part 314 (see Figure 2) as described above.

[0030] The resin part 70 holds the conductor configuration included in the power supply device 7. That is, the resin part 70 supports (holds) the positive electrode slip ring 71, the negative electrode slip ring 72, the positive electrode ring terminal portion 76, the negative electrode ring terminal portion 77, the positive electrode connecting leg portion 81, and the negative electrode connecting leg portion 82, which will be described later. In this case, the power supply device 7 may be formed by insert molding or the like.

[0031] In this embodiment, the resin portion 70 has a cylindrical portion 701, a leg portion 702, and an annular portion 703. The cylindrical portion 701 holds the positive electrode slip ring 71 and the negative electrode slip ring 72, which will be described later. The leg portion 702 extends axially between the cylindrical portion 701 and the annular portion 703. The leg portions 702 may be provided in pairs. The leg portions 702 hold the connecting leg portions 81 and 82, which will be described later. In a modified example, the leg portion 702 may be replaced by a cylindrical portion that is continuous in the circumferential direction. That is, the leg portion 702 may be omitted by extending the cylindrical portion 701 toward the X2 side. The annular portion 703 is continuous from the X2 side end of the leg portion 702 and extends radially outward in a manner that is in a plane perpendicular to the rotation axis I and around the rotation axis I. The annular portion 703 holds the positive terminal portion 76 and the negative terminal portion 77.

[0032] The power supply device 7 has a positive electrode slip ring 71 and a negative electrode slip ring 72.

[0033] The positive electrode slip ring 71 and the negative electrode slip ring 72 are formed of a conductor and each has an annular shape around the axis of rotation I. In this embodiment, for example, the positive electrode slip ring 71 is positioned closer to X1 than the negative electrode slip ring 72, but the opposite may also be true.

[0034] As described above, the positive electrode slip ring 71 and the negative electrode slip ring 72 are integrated into the cylindrical portion 701 of the resin portion 70. Specifically, the positive electrode slip ring 71 and the negative electrode slip ring 72 are provided on the outer circumferential surface of the X1 side portion of the cylindrical portion 701, so as to be exposed in the circumferential direction.

[0035] The positive electrode slip ring 71 and the negative electrode slip ring 72 are each slidably connected to the brush 69 (see Figure 1). As the rotor 310 rotates, the positive electrode slip ring 71 and the negative electrode slip ring 72 rotate together with the rotor 310 while maintaining an electrical connection (sliding state) with the brush 69.

[0036] The power supply device 7 further includes a positive-side ring terminal portion 76 and a negative-side ring terminal portion 77. The positive-side ring terminal portion 76 and the negative-side ring terminal portion 77 may be integrated with the annular portion 703 of the resin portion 70 as described above.

[0037] The positive side ring terminal portion 76 and the negative side ring terminal portion 77 are positioned on the X2 side (i.e., closer to the rotor core 312 of the rotor 310 in the axial direction) than the positive side slip ring 71 and the negative side slip ring 72.

[0038] The positive terminal ring terminal portion 76 is joined to the end of the lead wire 3161 (see Figure 2) of the rotor winding 316 (the positive terminal end of the rotor winding 316), and the negative terminal ring terminal portion 77 is joined to the end of the lead wire 3162 (see Figure 2) of the rotor winding 316 (the negative terminal connection terminal of the rotor winding 316).

[0039] In this embodiment, the positive terminal ring portion 76 and the negative terminal ring terminal portion 77 are continuous with the X2-side ends of the connecting leg portions 81 and 82, respectively, and extend in a plane perpendicular to the rotation axis I and around the rotation axis I.

[0040] Specifically, the positive-side ring terminal portion 76 and the negative-side ring terminal portion 77 extend over an angular range of 90 degrees or more around the rotation axis I. In this embodiment, the positive-side ring terminal portion 76 and the negative-side ring terminal portion 77 extend over different circumferential ranges within an angular range of 90 degrees or more and 180 degrees or less (approximately 180 degrees in this embodiment). That is, the positive-side ring terminal portion 76 and the negative-side ring terminal portion 77 are arranged in such a manner that they do not share the same circumferential position. In addition, in this embodiment, the positive-side ring terminal portion 76 and the negative-side ring terminal portion 77 extend over the same axial position. In this case, the axial size of the power supply device 7 can be reduced compared to the case where the positive-side ring terminal portion 76 and the negative-side ring terminal portion 77 extend over different axial positions.

[0041] Preferably, the positive-side ring terminal portion 76 and the negative-side ring terminal portion 77 are arranged in a diagonal positional relationship around the rotation axis I. This prevents rotational imbalance of the rotor 310 that may occur due to the positive-side ring terminal portion 76 and the negative-side ring terminal portion 77.

[0042] As described above, the positive electrode ring terminal portion 76 and the negative electrode ring terminal portion 77 are integrated with the annular portion 703 of the resin portion 70. In this case, the positive electrode ring terminal portion 76 is embedded within an angle range of approximately 180 degrees of the annular portion 703, and the negative electrode ring terminal portion 77 is embedded within another angle range of approximately 180 degrees of the annular portion 703.

[0043] However, the positive-side ring terminal portion 76 and the negative-side ring terminal portion 77 are exposed radially outward through a plurality of radial openings 7031 in the annular portion 703. That is, the annular portion 703 has a plurality of openings 7031 to partially expose the positive-side ring terminal portion 76 and the negative-side ring terminal portion 77 radially outward, respectively. Each of the plurality of openings 7031 may be of the same form. Each of the plurality of openings 7031 may be in the form of a hole that opens radially outward, or it may be in the form of a radial through hole. Alternatively, the plurality of openings 7031 may be realized in the form of a circumferentially continuous slit.

[0044] Each of the multiple openings 7031 allows for connection between the positive-side ring terminal portion 76 and the negative-side ring terminal portion 77 and the rotor winding 316. For example, the lead wire 3161 forming the positive-side end of the rotor winding 316 may be connected to the positive-side ring terminal portion 76 via one of the multiple openings 7031, and the lead wire 3162 forming the negative-side end of the rotor winding 316 may be connected to the negative-side ring terminal portion 77 via another of the multiple openings 7031. The method of connection between the positive-side ring terminal portion 76 and the negative-side ring terminal portion 77 and the lead wires 3161 and 3162 of the rotor winding 316 is arbitrary and may be achieved by joining with solder or the like, or by using a connector that may be placed in the opening 7031. Alternatively, the positive terminal ring portion 76 (and the negative terminal ring terminal portion 77) may have a radially protruding portion that extends radially outward from the annular portion 703 via the opening 7031.

[0045] The multiple openings 7031 are preferably arranged at equal pitches (equal angular pitches) in the circumferential direction, as shown in Figures 4 and 7. This prevents rotational unbalance of the rotor 310 that may occur due to the openings 7031. In this embodiment, as an example, a total of eight openings 7031 are provided at 45-degree intervals. However, in modified examples, the number and pitch of the openings 7031 may be different from those described above.

[0046] In this embodiment, the positive-side ring terminal portion 76 extends over an angular range of 90 degrees or more around the rotation axis I, so that the connection position between the positive-side ring terminal portion 76 and the lead wire 3161 of the rotor winding 316 can be set within an angular range of 90 degrees or more around the rotation axis I. Similarly, the negative-side ring terminal portion 77 extends over an angular range of 90 degrees or more around the rotation axis I, so that the connection position between the negative-side ring terminal portion 77 and the lead wire 3162 of the rotor winding 316 can be set within an angular range of 90 degrees or more around the rotation axis I. This facilitates the connection between the positive-side and negative-side ring terminal portions 76 and 77 and the rotor winding 316 of the rotor 310.

[0047] Specifically, as shown in Figure 7, according to this embodiment, openings 7031 can be set at four different circumferential positions on the positive-side ring terminal portion 76, which extends over an angular range of approximately 180 degrees. Here, for illustrative purposes, Figure 7 shows the four openings 7031 provided on the positive-side ring terminal portion 76 as openings 7031-1 to 7031-4. In this case, for example, if the lead wire 3161 (positive-side end) of the rotor winding 316 is drawn out from near position P1, the lead wire 3161 may be connected to the positive-side ring terminal portion 76 via opening 7031-1 near position P1 (see arrow R71). Similarly, if the lead wire 3161 (positive terminal end) of the rotor winding 316 is drawn out from, for example, near position P2, the lead wire 3161 may be connected to the positive terminal ring terminal 76 via the opening 7031-2 near position P2 (see arrow R72), and so on. In this way, by utilizing the opening 7031 closest to the position from which the lead wire 3161 (positive terminal end) of the rotor winding 316 is drawn out, the wiring distance between the rotor winding 316 and the positive terminal ring terminal 76 can be shortened. That is, the length of the lead wire 3161 can be shortened. In this case, the need to apply tension to the lead wire 3161 by forming a protrusion or the like on the end plate 313 is reduced, making it easier to route the lead wire 3161. In addition, rotational unbalance of the rotor 310 that may occur due to a protrusion or the like that may be formed on the end plate 313 can be prevented. The same applies to the negative terminal lead wire 3162.

[0048] The rotating power supply device 7 further has a positive electrode side connecting leg 81 and a negative electrode side connecting leg 82.

[0049] The positive electrode side connecting leg 81 extends axially between the positive electrode side slip ring 71 and the positive electrode side ring terminal 76. The X2 side end of the positive electrode side connecting leg 81 is bent radially outward and extends radially. Specifically, the positive electrode side connecting leg 81 includes an axial portion 810 and a radial portion 812. The axial portion 810 extends axially, and its X1 side end is joined to the positive electrode side slip ring 71. On the X2 side, the axial portion 810 extends to the axial position where the positive electrode side ring terminal 76 extends. The radial portion 812 is continuous with the X2 side end of the axial portion 810 and extends radially in a plane perpendicular to the rotation axis I. The radially outer end of the radial portion 812 is joined to the positive electrode side ring terminal 76. The positive terminal side connecting leg portion 81 may be formed from sheet metal or the like, but it may also be formed from a conductor wire similar to the rotor winding 316. Furthermore, the positive terminal side connecting leg portion 81 may be formed integrally with the positive terminal side ring terminal portion 76 (i.e., as a single piece).

[0050] The negative electrode side connecting leg 82 extends axially between the negative electrode side slip ring 72 and the negative electrode side ring terminal 77. The X2 side end of the negative electrode side connecting leg 82 is bent radially outward and extends radially. Specifically, the negative electrode side connecting leg 82 includes an axial portion 820 and a radial portion 822. The axial portion 820 extends axially, and its X1 side end is joined to the negative electrode side slip ring 72. On the X2 side, the axial portion 820 extends to the axial position where the negative electrode side ring terminal 77 extends. The radial portion 822 is continuous with the X2 side end of the axial portion 820 and extends radially in a plane perpendicular to the rotation axis I. The radially outer end of the radial portion 822 is joined to the negative electrode side ring terminal 77. The negative electrode connection leg portion 82 may be formed from sheet metal or the like, but it may also be formed from a conductor wire similar to the rotor winding 316. Furthermore, the negative electrode connection leg portion 82 may be formed integrally with the negative electrode ring terminal portion 77 (i.e., as a single piece).

[0051] The positive electrode side connecting leg 81 and the negative electrode side connecting leg 82 are integrated with the leg portion 702 of the resin portion 70 as described above. Specifically, the positive electrode side connecting leg 81 and the negative electrode side connecting leg 82 may be integrated with the leg portion 702 in such a manner that they are embedded in the leg portion 702.

[0052] Preferably, the positive electrode connecting leg 81 and the negative electrode connecting leg 82 are arranged in a diagonal positional relationship around the rotation axis I. This prevents rotational imbalance of the rotor 310 that may occur due to the positive electrode connecting leg 81 and the negative electrode connecting leg 82.

[0053] Next, further effects of this embodiment will be described with reference to Figures 8, 8A, and 9.

[0054] Figures 8, 8A, and 9 are conceptual diagrams schematically showing the connection method and connection points of the rotor windings 316. In Figures 8, 8A, and 9, the rotor windings 316 are shown at four circumferential positions corresponding to the arrangement of four magnetic poles in an axial view along the rotation axis I. Also in Figures 8, 8A, and 9, the magnetic flux formed at the teeth portion 3122 (see Figure 3) of the rotor 310 when the rotor windings 316 are energized is schematically shown by arrows within each rotor winding 316. The direction of the magnetic flux indicates the winding direction of each rotor winding 316, along with the direction of current flow. Furthermore, the positive side lead wire 3161 and the negative side lead wire 3162 are schematically shown by dashed lines. Note that while Figures 8, 8A, and 9 show a configuration in which the rotor windings 316 form four magnetic poles as an example, the same method is substantially applicable to other numbers of poles.

[0055] In the example shown in Figure 8, the rotor winding 316 has four poles connected in series. In this case, for example, the lead wires 3161 and 3162 at each position shown in Figure 8 are drawn out at positions nearly 90 degrees apart in the circumferential direction, but as described above, they can be easily connected to the positive-side ring terminal 76 and the negative-side ring terminal 77, which extend over an angular range of 90 degrees or more. For example, in the example shown in Figure 8, the positive-side lead wire 3161 is connected to the positive-side ring terminal 76 via the second opening 7031-2 in the clockwise direction of the four openings 7031 that expose the positive-side ring terminal 76. Also, the negative-side lead wire 3162 is connected to the negative-side ring terminal 77 via the first opening 7031-5 in the clockwise direction of the four openings 7031 that expose the negative-side ring terminal 77.

[0056] In the example shown in Figure 8, the winding direction of the rotor windings 316 for each pole is different, but as shown in Figure 8A, it is also possible to make the winding direction the same for the rotor windings 316 for each pole. In this case, manufacturability can be improved by making the winding direction the same for the rotor windings 316. In the example shown in Figure 8A, although the lead wires 3161 and 3162 at the positions shown in Figure 8A are drawn out at positions nearly 90 degrees apart in the circumferential direction, they can be easily connected to the positive-side ring terminal 76 and the negative-side ring terminal 77 as described above. For example, in the example shown in Figure 8A, the lead wire 3161 on the positive-side ring terminal 76 is connected to the positive-side ring terminal 76 via the fourth opening 7031-4 in a clockwise direction, which is one of the four openings 7031 that expose the positive-side ring terminal 76. Furthermore, the lead wire 3162 on the negative side is connected to the ring terminal portion 77 on the negative side via the second opening 7031-6 in a clockwise direction, which is one of the four openings 7031 that expose the ring terminal portion 77 on the negative side.

[0057] Furthermore, in the example shown in Figure 9, the rotor winding 316 is connected in series for two poles, and these two poles are connected in parallel to the ring terminals 76 and 77. In this case as well, although the lead wires 3161 and 3162 at the positions shown in Figure 9 are drawn out at positions nearly 90 degrees apart in the circumferential direction, they can be easily connected to the positive-side ring terminal 76 and the negative-side ring terminal 77, as described above. For example, in the example shown in Figure 9, the two lead wires 3161 on the positive side are connected to the positive-side ring terminal 76 via the first and fourth openings 7031-1 and 7031-4, respectively, in a clockwise direction, of the four openings 7031 that expose the positive-side ring terminal 76. Furthermore, the two lead wires 3162 on the negative side are connected to the ring terminal portion 77 on the negative side via the first and fourth openings 7031-5 and 7031-8, respectively, in a clockwise direction, of the four openings 7031 that expose the ring terminal portion 77 on the negative side.

[0058] In this way, according to this embodiment, it is possible to increase the degree of freedom regarding the connection method and connection location of the rotor winding 316.

[0059] Next, other embodiments will be described with reference to Figure 10 and subsequent figures. For the sake of distinction, the embodiment described above will also be referred to as "Embodiment 1," and the embodiment (other embodiment) described with reference to Figure 10 and subsequent figures will also be referred to as "Embodiment 2." In the description of Embodiment 2 below, components that may be substantially the same as those in Embodiment 1 above may be given the same reference numerals and their descriptions may be omitted.

[0060] Figure 10 is a perspective view showing an example of a rotating power supply device 7A (hereinafter also simply referred to as "power supply device 7A"). Figure 11 is a perspective view showing the power supply device 7A with the resin part 70A removed, for the purpose of explaining the conductor configuration of the power supply device 7A. Figure 12 is a schematic cross-sectional view of the power supply device 7A when cut by a plane passing through the rotation axis I, and Figure 13 is a schematic cross-sectional view of the power supply device 7A when cut by a plane along line CC in Figure 12.

[0061] The power supply device 7A according to this embodiment differs from the power supply device 7 according to Embodiment 1 described above in that the resin part 70 is replaced with a resin part 70A.

[0062] The power supply device 7A has a resin part 70A made of an insulating material such as resin. The resin part 70A is cylindrical in shape overall and may be fitted onto the shaft part 314 (see Figure 2) as described above.

[0063] The resin part 70A holds the conductor configuration included in the power supply device 7A. That is, the resin part 70A supports (holds) the positive electrode slip ring 71, the negative electrode slip ring 72, the positive electrode ring terminal portion 76A (described later), the negative electrode ring terminal portion 77A, the positive electrode connecting leg portion 81, and the negative electrode connecting leg portion 82. In this case, the power supply device 7A may be formed by insert molding or the like, similar to the power supply device 7 described above.

[0064] In this embodiment, the resin portion 70A has a cylindrical portion 701, a leg portion 702, and an annular portion 703A. The annular portion 703A is continuous with the X2 side end of the leg portion 702 and extends radially outward in a plane perpendicular to the rotation axis I and around the rotation axis I. The annular portion 703A holds the positive electrode side ring terminal portion 76A and the negative electrode side ring terminal portion 77A. The annular portion 703A has a longer axial length than the annular portion 703 in the power supply device 7 according to Embodiment 1 described above.

[0065] The power supply device 7A according to this embodiment differs from the power supply device 7 according to Embodiment 1 described above in that the positive-side ring terminal portion 76 and the negative-side ring terminal portion 77 are replaced with the positive-side ring terminal portion 76A and the negative-side ring terminal portion 77A, respectively.

[0066] The positive terminal ring portion 76A and the negative terminal ring terminal portion 77A may be integrated with the annular portion 703A of the resin portion 70A, as described above.

[0067] The positive side ring terminal portion 76A and the negative side ring terminal portion 77A are positioned closer to the X2 side (i.e., closer to the rotor core 312 of the rotor 310 in the axial direction) than the positive side slip ring 71 and the negative side slip ring 72.

[0068] The positive terminal ring terminal portion 76A is joined to the end of the lead wire 3161 (see Figure 2) of the rotor winding 316 (the positive terminal end of the rotor winding 316), and the negative terminal ring terminal portion 77A is joined to the end of the lead wire 3162 (see Figure 2) of the rotor winding 316 (the negative terminal connection terminal of the rotor winding 316).

[0069] The positive terminal ring terminal portion 76A and the negative terminal ring terminal portion 77A are continuous with the X2-side ends of the connecting leg portions 81 and 82, respectively, and extend in a plane perpendicular to the rotation axis I and around the rotation axis I.

[0070] The positive terminal ring portion 76A and the negative terminal ring terminal portion 77A extend over an angular range of 90 degrees or more around the rotation axis I. In this embodiment, the positive terminal ring terminal portion 76A and the negative terminal ring terminal portion 77A extend over different angular ranges within a 360-degree range (approximately 180 degrees in this embodiment). Consequently, in this embodiment, the positive terminal ring terminal portion 76A and the negative terminal ring terminal portion 77A extend to different axial positions.

[0071] The positive terminal ring portion 76A and the negative terminal ring terminal portion 77A are integrated with the annular portion 703A of the resin portion 70A, as described above. In this case, the positive terminal ring terminal portion 76A is embedded within a 360-degree angle range of the annular portion 703A, and the negative terminal ring terminal portion 77A is embedded within a 360-degree angle range of the annular portion 703A.

[0072] However, the positive-side ring terminal portion 76A and the negative-side ring terminal portion 77A are exposed radially outward through multiple radial openings 7031A and 7032A of the annular portion 703A. That is, the annular portion 703A has multiple openings 7031A and 7032A to partially expose the positive-side ring terminal portion 76A and the negative-side ring terminal portion 77A, respectively, radially outward. The shape of the openings 7031A and 7032A may be the same as the opening 7031 of the power supply device 7 according to Embodiment 1 described above.

[0073] Each of the multiple openings 7031A allows connection between the positive-side ring terminal portion 76A and the lead wire 3161 of the rotor winding 316, and each of the multiple openings 7032A allows connection between the negative-side ring terminal portion 77A and the lead wire 3162 of the rotor winding 316. For example, the lead wire 3161 forming the positive-side end of the rotor winding 316 may be connected to the positive-side ring terminal portion 76A via one of the multiple openings 7031A, and the lead wire 3162 forming the negative-side end of the rotor winding 316 may be connected to the negative-side ring terminal portion 77A via one of the multiple openings 7032A. The method of connecting the positive-side ring terminal portion 76A and the negative-side ring terminal portion 77A with the lead wires 3161 and 3162 of the rotor winding 316 is arbitrary and may be done by joining them with solder or the like, or it may be done via connectors that may be placed in the openings 7031A and 7032A.

[0074] Preferably, each of the openings 7031A and 7032A is provided at equal pitches (equal angular pitches) in the circumferential direction, as shown in Figures 10 and 13. This prevents rotational unbalance of the rotor 310 that may occur due to the openings 7031A and 7032A. In this embodiment, as an example, a total of eight openings 7031A and eight openings 7032A are provided at 45-degree intervals. However, in modified examples, the number and pitch of the openings 7031A and 7032A may be different from those described above. Note that multiple openings 7031A and multiple openings 7032A may be formed at the same circumferential position as shown in Figure 10.

[0075] In this embodiment, as in Embodiment 1 described above, the positive-side ring terminal portion 76A extends over an angular range of 90 degrees or more around the rotation axis I, so that the connection position between the positive-side ring terminal portion 76A and the lead wire 3161 of the rotor winding 316 can be set within an angular range of 90 degrees or more around the rotation axis I. Similarly, the negative-side ring terminal portion 77A extends over an angular range of 90 degrees or more around the rotation axis I, so that the connection position between the negative-side ring terminal portion 77A and the lead wire 3162 of the rotor winding 316 can be set within an angular range of 90 degrees or more around the rotation axis I. This makes it easier to connect the positive-side and negative-side ring terminal portions 76A and 77A to the rotor winding 316 of the rotor 310.

[0076] Specifically, as shown in Figure 13, according to this embodiment, openings 7031A can be set at eight different circumferential positions on the positive-side ring terminal portion 76A that extends over a 360-degree angular range. Here, for illustrative purposes, Figure 13 shows the eight openings 7031A provided on the positive-side ring terminal portion 76A as openings 7031A-1 to 7031A-8. In this case, for example, if the lead wire 3161 (positive-side end) of the rotor winding 316 is drawn out from near position P1, the lead wire 3161 may be connected to the positive-side ring terminal portion 76A via opening 7031A-1 near position P1 (see arrow R131). Similarly, if the lead wire 3161 (positive terminal end) of the rotor winding 316 is drawn out from, for example, near position P5, the lead wire 3161 may be connected to the positive terminal ring terminal 76A via the opening 7031A-5 near position P5 (see arrow R135), and the same may apply to other connections. In this way, by utilizing the opening 7031A closest to the position from which the lead wire 3161 (positive terminal end) of the rotor winding 316 is drawn out, the wiring distance between the rotor winding 316 and the positive terminal ring terminal 76A can be shortened. That is, the length of the lead wire 3161 can be shortened. In this case, the need to apply tension to the lead wire 3161 by forming a protrusion or the like on the end plate 313 is reduced, making it easier to route the lead wire 3161. In addition, rotational unbalance of the rotor 310 that may occur due to a protrusion or the like that may be formed on the end plate 313 can be prevented. The same applies to the negative terminal lead wire 3162.

[0077] In particular, according to this embodiment, the positive terminal ring terminal portion 76A extends over a 360-degree angular range, so even if the lead wire 3161 (positive terminal end) of the rotor winding 316 is drawn out at any circumferential position, efficient routing of the lead wire 3161 is possible. Similarly, the negative terminal ring terminal portion 77A extends over a 360-degree angular range, so even if the lead wire 3162 (negative terminal end) of the rotor winding 316 is drawn out at any circumferential position, efficient routing of the lead wire 3162 is possible.

[0078] Next, with reference to Figure 14, further effects of this embodiment will be described.

[0079] Figure 14 is a conceptual diagram schematically showing the winding direction of the rotor winding 316 and the positions of the respective lead wires 3161 and 3162. Figure 14 is an explanatory diagram of the axial view along the rotation axis I, similar to Figures 8, 8A, and 9 referenced in the above-described embodiment 1, and the method of illustration is the same.

[0080] In the example shown in Figure 14, the rotor winding 316 is connected to the ring terminals 76A and 77A in a parallel relationship for each of the four poles. In this case, for example, the lead wires 3161 and 3162 at each position shown in Figure 14 are drawn out at different positions at 90-degree intervals in the circumferential direction, but as described above, they can be easily connected to the positive-side ring terminal 76A and the negative-side ring terminal 77A. For example, in the example shown in Figure 14, the lead wire 3161 on the positive side is connected to the positive-side ring terminal 76A via the 2nd, 4th, 6th, and 8th openings 7031A-2, 7031A-4, 7031A-6, and 7031A-8, respectively, in a clockwise direction, of the eight openings 7031A that expose the positive-side ring terminal 76A. Similarly, the lead wires 3162 on the negative side are connected to the negative-side ring terminal 77A via the nearest openings 7032A, although these are not shown. In this embodiment as well, the connection methods and connection points shown in Figures 8, 8A, and 9, which were referenced in Embodiment 1 described above, can also be realized in the same way.

[0081] In this way, according to this embodiment, it is possible to increase the degree of freedom regarding the connection method and connection location of the rotor windings 316. Furthermore, according to this embodiment, since the rotor windings 316 for each pole can be formed independently of each other, manufacturability can be improved. Therefore, for example, as shown in Figure 14, it is possible to make the winding direction the same for the rotor windings 316 for each pole, thereby improving manufacturability.

[0082] Although each embodiment has been described in detail above, the invention is not limited to any particular embodiment, and various modifications and changes are possible within the scope described in the claims. Furthermore, it is possible to combine all or more of the components of the embodiments described above. [Explanation of Symbols]

[0083] 3... Rotating electric machine (winding field type rotating electric machine), 320... Stator, 310... Rotor, 312... Rotor core, 3122... Teeth section, 314... Shaft section, 316... Rotor winding (field winding), 64... Power supply circuit section (power control unit, fixed-side power supply device), 69... Brush (fixed-side power supply device), 7... Rotating-side power supply device, 70... Resin section, 701... Cylindrical section, 703, 703A... Annular section, 7031, 7031A, 7032A... Opening, 71... Positive side slip ring, 72... Negative side slip ring, 76, 76A... Ring terminal section (positive side rotor connection section), 77, 77A... Ring terminal section (negative side rotor connection section)

Claims

1. A wound-field rotating electric machine, stator and, A rotor having a shaft portion, a rotor core fixed coaxially to the shaft portion, and field windings wound around multiple teeth portions of the rotor core, and arranged coaxially with the stator and with a radial gap between them, A power supply device on the rotating side is provided on the shaft portion so as to rotate integrally with the shaft portion, and includes a slip ring and a rotor connection portion connected to the field winding, The system comprises a power control unit and a stationary power supply unit that includes a brush slidable on the slip ring and supplies power to the field winding together with the rotating power supply unit, The power supply device on the rotating side is, The slip rings on the positive and negative sides each have an annular shape around the rotor axis, The rotor connection portion on the positive side is positioned closer to the rotor in the axial direction than the slip rings on the positive and negative sides, and is electrically connected to the slip ring on the positive side and the field winding, The rotor connection portion on the negative side is positioned closer to the rotor in the axial direction than the slip rings on the positive and negative sides, and is electrically connected to the slip ring on the negative side and the field winding, It has a resin portion that integrates the slip ring and rotor connection portion on the positive electrode side with the slip ring and rotor connection portion on the negative electrode side. A wound-field rotating electric machine in which the rotor connection portions on the positive and negative sides each extend over an angular range of 90 degrees or more around the rotor axis.

2. The resin portion has a cylindrical portion that holds the slip rings on the positive electrode side and the negative electrode side, and an annular portion that holds the rotor connection portion on the positive electrode side and the negative electrode side. The wound-field rotating electric machine according to claim 1, wherein the annular portion has radial openings around the rotor axis for electrically connecting the field windings to the rotor connection portions on the positive and negative sides.

3. The winding field rotating electric machine according to claim 1 or 2, wherein the rotor connection portions on the positive and negative sides extend over different angular ranges within an angular range of 180 degrees or less around the rotor axis, and in the same axial position.

4. The winding field rotating electric machine according to claim 1 or 2, wherein the rotor connection portions on the positive and negative sides extend over a 360-degree angular range around the rotor axis and in different axial positions.

5. The winding direction of the field windings wound around the plurality of teeth is the same in the plurality of teeth, as described in claim 1.

6. A power supply device that can be attached to the rotor of a wound-field rotating electric machine, It is slidable relative to the fixed brush, and has slip rings on the positive and negative sides, A rotor connection portion on the positive side is positioned closer to the rotor in the axial direction than the slip rings on the positive and negative sides, and is electrically connected to the slip ring on the positive side and the field winding of the rotor. A rotor connection portion on the negative side is positioned closer to the rotor in the axial direction than the slip rings on the positive and negative sides, and is electrically connected to the slip ring on the negative side and the field winding. It has a resin portion that integrates the slip ring and rotor connection portion on the positive electrode side with the slip ring and rotor connection portion on the negative electrode side. The rotor connection portions on the positive and negative sides each extend over an angular range of 90 degrees or more around the rotor axis, in a power supply device.

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