JP2023157379A - Winding magnetic field type rotary electric machine and power supply device - Google Patents

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

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

The positive and negative slip rings at one end in the axial direction are formed by annular conductor parts, and the connection terminal parts at the other end in the axial direction are formed by conductor terminals protruding outward in the radial direction. Techniques for forming and resin molding are known.

JP2020-202624A

However, in the above-mentioned conventional technology, since the connection terminals on the positive and negative sides are arranged only at specific positions in the circumferential direction, the field windings of the rotor are connected to the connection terminals on the positive and negative sides, respectively. There is a problem that the degree of freedom in wiring is low when connecting. For example, if the connection terminal on the positive pole side and the connection end of the field winding of the rotor are spaced apart in the circumferential direction, a protrusion or the like is provided on the end plate of the rotor to apply tension to the field winding. At the same time, it becomes necessary to install cables.

Therefore, in one aspect, the present disclosure aims to facilitate the connection between the slip rings on the positive and negative sides and the field windings of the rotor.

In one aspect, it is a wound field type rotating electric machine,
stator and
A rotor core having a shaft portion, a rotor core coaxially fixed to the shaft portion, and a field winding wound around a plurality of teeth portions of the rotor core, and arranged coaxially with the stator and with a gap in the radial direction. a rotor that is
a rotation-side power supply device that is provided on the shaft portion so as to rotate together with the shaft portion, and includes a slip ring and a rotor connection portion that is connected to the field winding;
a fixed-side power supply device that includes a power control unit and a brush that is slidable on the slip ring and supplies power to the field winding together with the rotation-side power supply device;
The rotation side power supply device is
The slip rings on the positive electrode side and the negative electrode side each have an annular shape around the rotor axis;
the rotor connection portion on the positive side, which is arranged closer to the rotor in the axial direction than the slip rings on the positive side and the negative side, and is electrically connected to the slip ring on the positive side and the field winding;
the rotor connection portion on the negative side that is arranged closer to the rotor in the axial direction than the slip rings on the positive and negative sides, and electrically connected to the slip ring on the negative side and the field winding;
a resin portion that integrates the slip ring on the positive electrode side and the rotor connection portion on the positive electrode side, and the slip ring on the negative electrode side and the rotor connection portion on the negative electrode side;
A wound field type rotating electrical machine is provided 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.

In one aspect, according to the present disclosure, it is possible to facilitate the connection between the slip rings on the positive and negative sides and the field windings of the rotor.

FIG. 1 is a configuration diagram showing a vehicle drive system including a drive device for a rotating electrical machine according to an embodiment. FIG. 2 is a schematic cross-sectional view showing a part of the cross section of the rotating electric machine. FIG. 3 is a schematic cross-sectional view showing a part of the cross section of the rotating electric machine (a cross section taken along line AA in FIG. 2). FIG. 2 is a perspective view showing an example of a rotation-side power supply device according to the first embodiment. FIG. 2 is a perspective view showing the power supply device according to the first embodiment with a resin part removed for explaining the conductor structure. A schematic cross-sectional view of the power supply device according to Example 1 when cut along a plane passing through the rotation axis I 7 is a schematic cross-sectional view of the power supply device according to Example 1, taken along a plane along line BB in FIG. 6. FIG. FIG. 3 is a conceptual diagram schematically showing an example of a method of connecting rotor windings and connection locations in the power supply device on the rotation side according to the first embodiment. FIG. 7 is a conceptual diagram schematically showing another example of a method of connecting rotor windings and connection locations in the power supply device on the rotation side according to the first embodiment. FIG. 7 is a conceptual diagram schematically showing still another example of a method of connecting rotor windings and connection locations in the power supply device on the rotation side according to the first embodiment. FIG. 3 is a perspective view showing an example of a rotation-side power supply device according to a second embodiment. FIG. 7 is a perspective view showing a power supply device according to a second embodiment with a resin part removed for explaining the conductor structure. A schematic cross-sectional view of the power supply device according to Example 2 when cut along a plane passing through the rotation axis I 13 is a schematic cross-sectional view of the power supply device according to Example 2, taken along a plane along line CC in FIG. 12. FIG. FIG. 7 is a conceptual diagram schematically showing an example of a connection method and connection locations of rotor windings in a rotation-side power supply device according to a second embodiment.

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

FIG. 1 is a configuration diagram showing a vehicle drive system 1 including a drive device 5 for a rotating electrical machine according to this embodiment. FIG. 2 is a schematic cross-sectional view showing a part of the cross section of the rotating electric machine 3 (a cross section cut along a plane including the rotation axis I). FIG. 3 is a schematic sectional view showing a part of the cross section of the rotating electric machine 3 (a cross section taken along line AA in FIG. 2). In FIG. 2, an X direction along the rotation axis I, an X1 side, and an X2 side are defined. 1 and 2 schematically show the power supply device 7 on the rotation side and the brush 69 (only in FIG. 1), but the detailed configuration of the power supply device 7 on the rotation side can be seen from FIG. 4 onwards. This will be described later with reference.

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

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

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

The rotating electrical machine 3 is a wire-wound field type machine that includes a rotating power supply device 7 (described later) and a brush 69, and includes a rotor 310 and a stator 320. The rotor 310 is arranged radially inside the stator 320, coaxially with the stator 320, and with a gap provided in the radial direction. Rotor 310 has a rotor core 312, a shaft portion 314, and rotor windings 316. The rotor core 312 is coaxially fixed to the shaft portion 314. Note that, as shown in FIG. 3, the rotor core 312 has teeth portions 3122 that protrude outward in the radial direction, and a conductor wire forming the rotor winding 316 is wound around the teeth portions 3122. The stator winding 322 is wound around the teeth portion 3210 of the stator core 321, as shown in FIG.

The rotor winding 316 has lead wires 3161 and 3162 that are electrically connected to a power supply device 7 on the rotation side, which will be described later. Note that the lead wires 3161 and 3162 extend axially outward from the coil ends of the rotor winding 316 (portions that protrude outward in the axial direction from the end surface of the rotor core 312), and are part of the rotor winding 316. It's fine. Note that the end surface of the rotor core 312 may be covered in the axial direction by an end plate 313. The end plate 313 may be formed of a single member or a plurality of members, and may be in the form of an end cover that covers the entire coil end of the rotor winding 316.

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

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

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

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

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

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

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

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

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

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

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

Next, the characteristic configuration of this embodiment will be explained with reference to FIG. 4 and subsequent figures.

FIG. 4 is a perspective view showing an example of the rotation-side power supply device 7 (hereinafter also simply referred to as "power supply device 7"). FIG. 5 is a perspective view showing the power supply device 7 with the resin portion 70 removed for explaining the conductor structure of the power supply device 7. As shown in FIG. 6 is a schematic cross-sectional view of the power supply device 7 taken along a plane passing through the rotation axis I, and FIG. 7 is a schematic cross-sectional view of the power supply device 7 taken along a plane along the line BB in FIG. FIG.

The power supply device 7 has a resin portion 70 made of an insulating material such as resin. The resin part 70 has a cylindrical shape as a whole, and may be fitted into the shaft part 314 (see FIG. 2) as described above.

The resin portion 70 retains the conductor configuration included in the power supply device 7. That is, the resin part 70 includes a positive side slip ring 71, a negative side slip ring 72, a positive side ring terminal section 76, a negative side ring terminal section 77, a positive side connection leg section 81, and a negative side connection, which will be described later. The leg portion 82 is supported (held). In this case, the power supply device 7 may be formed by insert molding or the like.

In this embodiment, the resin part 70 has a cylindrical part 701, a leg part 702, and an annular part 703. The cylindrical portion 701 holds a positive slip ring 71 and a negative slip ring 72, which will be described later. The leg portion 702 extends in the axial direction between the cylindrical portion 701 and the annular portion 703. Legs 702 may be provided in pairs. The legs 702 hold connection legs 81 and 82, which will be described later. In addition, in a modified example, the leg portion 702 may be replaced by a cylindrical portion 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 continues from the X2 side end of the leg portion 702 and extends in a plane perpendicular to the rotation axis I and around the rotation axis I in a manner that spreads outward in the radial direction. The annular portion 703 holds a ring terminal portion 76 on the positive electrode side and a ring terminal portion 77 on the negative electrode side.

The power supply device 7 includes a positive slip ring 71 and a negative slip ring 72.

The positive slip ring 71 and the negative slip ring 72 are formed of a conductor, and each has an annular shape around the rotation axis I. In this embodiment, as an example, the positive slip ring 71 is arranged closer to the X1 side than the negative slip ring 72, but the reverse may be possible.

The positive slip ring 71 and the negative slip ring 72 are integrated into the cylindrical portion 701 of the resin portion 70 as described above. Specifically, the positive slip ring 71 and the negative slip ring 72 are provided on the outer circumferential surface of the X1 side portion of the cylindrical portion 701 in such a manner that they are exposed in the circumferential direction.

The positive slip ring 71 and the negative slip ring 72 are each slidably connected to the brush 69 (see FIG. 1). When the rotor 310 rotates, the positive slip ring 71 and the negative slip ring 72 rotate together with the rotor 310 while maintaining an electrically connected state (sliding state) with the brush 69.

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

The ring terminal portion 76 on the positive side and the ring terminal portion 77 on the negative side are arranged on the X2 side (that is, the side 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. .

The ring terminal portion 76 on the positive electrode side is joined to the end of the lead wire 3161 (see FIG. 2) of the rotor winding 316 (the end on the positive electrode side of the rotor winding 316), and the ring terminal portion 77 on the negative electrode side is connected to the end of the lead wire 3161 (see FIG. 2). It is joined to the end (connection terminal on the negative electrode side of the rotor winding 316) of the lead wire 3162 (see FIG. 2) of the rotor winding 316.

In this embodiment, the ring terminal portion 76 on the positive electrode side and the ring terminal portion 77 on the negative electrode side are continuous from the respective X2 side ends of the connecting leg portions 81 and 82, which will be described later, and are perpendicular to the rotation axis I. Extends in the plane and around the rotation axis I.

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

The ring terminal portion 76 on the positive electrode side and the ring terminal portion 77 on the negative electrode side are preferably arranged in a diagonal positional relationship around the rotation axis I. Thereby, it is possible to prevent rotational imbalance of the rotor 310 that may occur due to the ring terminal portion 76 on the positive electrode side and the ring terminal portion 77 on the negative electrode side.

The ring terminal portion 76 on the positive electrode side and the ring terminal portion 77 on the negative electrode side are integrated into the annular portion 703 of the resin portion 70 as described above. In this case, the ring terminal portion 76 on the positive electrode side is buried within an angle range of approximately 180 degrees of the annular portion 703, and the ring terminal portion 77 on the negative electrode side is buried within an angle range of approximately 180 degrees in the annular portion 703. Buried within the angular range.

However, the ring terminal portion 76 on the positive electrode side and the ring terminal portion 77 on the negative electrode side are exposed to the outside in the radial direction through the plurality of radial openings 7031 in the annular portion 703. That is, the annular portion 703 has a plurality of openings 7031 for partially exposing each of the positive electrode side ring terminal portion 76 and the negative electrode side ring terminal portion 77 to the outside in the radial direction. Each of the plurality of openings 7031 may have the same shape. Note that each of the plurality of openings 7031 may be in the form of a hole whose radially outer side is open, or may be in the form of a radial through hole. Alternatively, the plurality of openings 7031 may be realized in the form of continuous slits in the circumferential direction.

Each of the plurality of openings 7031 allows connection between the ring terminal portion 76 on the positive electrode side and the ring terminal portion 77 on the negative electrode side and the rotor winding 316. For example, the lead wire 3161 forming the positive end of the rotor winding 316 may be connected to the positive ring terminal 76 through one of the plurality of openings 7031. The lead wire 3162 forming the end of the rotor winding 316 on the negative side may be connected to the ring terminal section 77 on the negative side through another opening 7031 among the plurality of openings 7031. Note that the connection method between the ring terminal portion 76 on the positive electrode side and the ring terminal portion 77 on the negative electrode side and the lead wires 3161 and 3162 of the rotor winding 316 is arbitrary, and they may be joined by soldering or the like. It may be realized via a connector that may be placed in the opening 7031. Alternatively, the ring terminal portion 76 on the positive electrode side (the same applies to the ring terminal portion 77 on the negative electrode side) has a radially protruding portion that extends radially outward from the annular portion 703 via the opening 7031. It's okay.

The plurality of openings 7031 are preferably provided at equal pitches (equal angular pitches) in the circumferential direction, as shown in FIGS. 4 and 7. Thereby, rotational imbalance of the rotor 310 that may occur due to the opening 7031 can be prevented. In this embodiment, as an example, a total of eight openings 7031 are provided at intervals of 45 degrees. However, in a modified example, the number and pitch of the openings 7031 may have values different from those described above.

In this manner, according to the present embodiment, the ring terminal portion 76 on the positive electrode side extends over an angular range of 90 degrees or more around the rotation axis I. , the connection position between the ring terminal portion 76 on the positive electrode side and the lead wire 3161 of the rotor winding 316 can be set. Similarly, since the ring terminal portion 77 on the negative electrode side extends over an angular range of 90 degrees or more around the rotation axis I, the ring terminal portion 77 on the negative electrode side extends within an angular range of 90 degrees or more around the rotation axis I. The connection position between the rotor winding 316 and the lead wire 3162 of the rotor winding 316 can be set. Thereby, the connection between the ring terminal portions 76 and 77 on the positive and negative sides and the rotor winding 316 of the rotor 310 can be facilitated.

Specifically, as shown in FIG. 7, according to this embodiment, openings are formed at four different positions in the circumferential direction with respect to the ring terminal portion 76 on the positive electrode side that extends over an angular range of about 180 degrees. 7031 can be set. Here, in FIG. 7, four openings 7031 provided for the ring terminal portion 76 on the positive electrode side are illustrated as openings 7031-1 to 7031-4 for the purpose of explanation. In this case, for example, when the lead wire 3161 (the end on the positive electrode side) of the rotor winding 316 is drawn out from near position P1, the lead wire 3161 is connected to the positive electrode side through the opening 7031-1 near position P1. (see arrow R71). Similarly, when the lead wire 3161 (the end on the positive electrode side) of the rotor winding 316 is drawn out from, for example, near position P2, the lead wire 3161 passes through the opening 7031-2 near position P2 to the positive electrode ring. It may be connected to the terminal portion 76 (see arrow R72), and the same may be true hereafter. In this way, by using the opening 7031 closest to the position where the lead wire 3161 (end on the positive side) of the rotor winding 316 is drawn out, the rotor winding 316 and the ring terminal section 76 on the positive side are connected. The wiring distance between the two can be shortened. That is, the length of the lead line 3161 can be shortened. Further, in this case, by forming a protrusion or the like on the end plate 313, the need to apply tension to the lead wire 3161 is reduced, so that the wiring of the lead wire 3161 can be facilitated. Furthermore, it is possible to prevent rotational imbalance of the rotor 310 that may occur due to protrusions or the like that may be formed on the end plate 313. This also applies to the lead wire 3162 on the negative electrode side.

The power supply device 7 on the rotation side further includes a connection leg 81 on the positive side and a connection leg 82 on the negative side.

The positive electrode side connection leg portion 81 extends between the positive electrode side slip ring 71 and the positive electrode side ring terminal portion 76 in the axial direction. The positive electrode side connecting leg portion 81 has an end portion on the X2 side bent radially outward, and extends in the radial direction. Specifically, the positive electrode side connection leg portion 81 includes an axial portion 810 and a radial portion 812. The axial portion 810 extends in the axial direction, and its X1 side end portion is joined to the positive slip ring 71. On the X2 side, the axial portion 810 extends to the axial position where the ring terminal portion 76 on the positive electrode side extends. The radial portion 812 is continuous from the X2 side end of the axial portion 810 and extends in a plane perpendicular to the rotation axis I and in the radial direction. A radial outer end of the radial portion 812 is joined to the ring terminal portion 76 on the positive electrode side. Note that the connection leg 81 on the positive electrode side may be formed of a sheet metal or the like, but may also be formed of a conductor wire similar to the rotor winding 316. Further, the positive electrode side connection leg portion 81 may be formed integrally with the positive electrode side ring terminal portion 76 (that is, as a one-piece member).

The negative electrode side connection leg portion 82 extends between the negative electrode side slip ring 72 and the negative electrode side ring terminal portion 77 in the axial direction. The negative electrode side connecting leg portion 82 has an end portion on the X2 side bent radially outward, and extends in the radial direction. Specifically, the negative electrode side connection leg portion 82 includes an axial portion 820 and a radial portion 822. The axial portion 820 extends in the axial direction, and its X1 side end portion is joined to the negative slip ring 72 . On the X2 side, the axial portion 820 extends to the axial position where the ring terminal portion 77 on the negative electrode side extends. The radial portion 822 is continuous from the X2 side end of the axial portion 820 and extends in the plane perpendicular to the rotation axis I and in the radial direction. A radial outer end of the radial portion 822 is joined to the ring terminal portion 77 on the negative electrode side. Note that the negative electrode side connection leg portion 82 may be formed of a sheet metal or the like, but may also be formed of a conductor wire similar to the rotor winding 316. Further, the negative electrode side connection leg portion 82 may be formed integrally with the negative electrode side ring terminal portion 77 (that is, as a one-piece member).

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

The positive electrode side connection leg portion 81 and the negative electrode side connection leg portion 82 are preferably arranged in a diagonal positional relationship around the rotation axis I. Thereby, it is possible to prevent rotational imbalance of the rotor 310 that may occur due to the connection leg 81 on the positive side and the connection leg 82 on the negative side.

Next, further effects of this embodiment will be described with reference to FIGS. 8, 8A, and 9.

8, FIG. 8A, and FIG. 9 are conceptual diagrams schematically showing the connection method and connection locations of the rotor winding 316. 8, FIG. 8A, and FIG. 9, the rotor winding 316 is shown at four circumferential positions corresponding to the arrangement of the four magnetic poles when viewed in the axial direction along the rotation axis I. Further, in FIGS. 8, 8A, and 9, the magnetic flux formed in the teeth portion 3122 of the rotor 310 (see FIG. 3) when the rotor winding 316 is energized is schematically shown by the arrow inside each rotor winding 316. is shown. The direction of the magnetic flux indicates the winding direction of each rotor winding 316 as well as the direction in which the current flows. Furthermore, a positive electrode side lead line 3161 and a negative electrode side lead line 3162 are each schematically shown with a dashed dotted line. 8, FIG. 8A, and FIG. 9 show, as an example, a configuration in which the rotor winding 316 forms four magnetic poles, but the application is substantially the same even if the rotor winding 316 forms four magnetic poles. It is possible.

In the example shown in FIG. 8, the rotor winding 316 has four poles connected in series. In this case, for example, although the lead lines 3161 and 3162 at each position shown in FIG. It can be easily connected to the terminal portion 76 and the ring terminal portion 77 on the negative electrode side. For example, in the example shown in FIG. 8, the positive electrode side lead wire 3161 is inserted through the second clockwise opening 7031-2 of the four openings 7031 that expose the positive electrode side ring terminal portion 76. It is connected to the ring terminal section 76 on the positive electrode side. Further, the negative electrode side lead wire 3162 is connected to the negative electrode side ring terminal portion 77 through the first clockwise opening 7031-5 of the four openings 7031 that expose the negative electrode side ring terminal portion 77. It is connected to the.

In the example shown in FIG. 8, the winding direction of the rotor winding 316 related to each pole is different, but as shown in FIG. 8A, it is also possible to make the winding direction of the rotor winding 316 related to each pole the same. It is. In this case, since the rotor windings 316 are wound in the same direction, manufacturability can be improved. Note that even in the example shown in FIG. 8A, although the lead wires 3161 and 3162 at each position shown in FIG. 8A are drawn out at positions nearly 90 degrees apart in the circumferential direction, as described above, It can be easily connected to the ring terminal portion 77 on the negative electrode side. For example, in the example shown in FIG. 8A, the positive electrode side lead wire 3161 is inserted through the fourth clockwise opening 7031-4 of the four openings 7031 that expose the positive electrode side ring terminal portion 76. It is connected to the ring terminal section 76 on the positive electrode side. Further, the negative electrode side lead wire 3162 is connected to the negative electrode side ring terminal portion 77 through the second clockwise opening 7031-6 of the four openings 7031 that expose the negative electrode side ring terminal portion 77. It is connected to the.

Further, in the example shown in FIG. 9, the two poles of the rotor winding 316 are connected in series, and the two poles are connected in parallel to the ring terminal portions 76 and 77. In this case as well, for example, although the lead wires 3161 and 3162 at each position shown in FIG. It can be easily connected to the terminal portion 77. For example, in the example shown in FIG. 9, the two lead wires 3161 on the positive electrode side are connected to the first and fourth openings in the clockwise direction of the four openings 7031 that expose the ring terminal section 76 on the positive electrode side. They are connected to the ring terminal portion 76 on the positive electrode side via 7031-1 and 7031-4, respectively. Further, the two lead wires 3162 on the negative electrode side are connected to the first and fourth openings 7031-5 and 7031-8 in the clockwise direction of the four openings 7031 that expose the ring terminal portion 77 on the negative electrode side. are respectively connected to the ring terminal portion 77 on the negative electrode side via.

In this manner, 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.

Next, other embodiments will be described with reference to FIG. 10 and subsequent figures. Hereinafter, for the sake of distinction, the embodiment described above will also be referred to as "Example 1", and the present embodiment (other embodiments) described with reference to FIG. 10 and subsequent figures will also be referred to as "Example 2." In the following description of Example 2, constituent elements that may be substantially the same as those of Example 1 described above may be given the same reference numerals and the description thereof may be omitted.

FIG. 10 is a perspective view showing an example of a rotation-side power supply device 7A (hereinafter also simply referred to as "power supply device 7A"). FIG. 11 is a perspective view of the power supply device 7A with the resin portion 70A removed for explaining the conductor configuration of the power supply device 7A. 12 is a schematic cross-sectional view of the power supply device 7A taken along a plane passing through the rotation axis I, and FIG. 13 is a schematic cross-sectional view of the power supply device 7A taken along a plane along the line CC in FIG. FIG.

The power supply device 7A according to this embodiment differs from the power supply device 7 according to the first embodiment described above in that the resin portion 70 is replaced with a resin portion 70A.

The power supply device 7A has a resin portion 70A formed of an insulating material such as resin. The resin portion 70A has an overall cylindrical shape, and may be fitted into the shaft portion 314 (see FIG. 2) as described above.

The resin portion 70A retains the conductor configuration included in the power supply device 7A. That is, the resin part 70A includes a positive side slip ring 71, a negative side slip ring 72, a positive side ring terminal section 76A (described later), a negative side ring terminal section 77A, a positive side connection leg section 81, and a negative side connection. The leg portion 82 is supported (held). 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.

In this embodiment, the resin portion 70A includes a cylindrical portion 701, a leg portion 702, and an annular portion 703A. The annular portion 703A continues from the X2 side end of the leg portion 702 and extends in a plane perpendicular to the rotation axis I and around the rotation axis I in a manner that spreads outward in the radial direction. The annular portion 703A holds a ring terminal portion 76A on the positive electrode side and a ring terminal portion 77A on the negative electrode side. The annular portion 703A has a longer length in the axial direction than the annular portion 703 in the power supply device 7 according to the first embodiment described above.

The power supply device 7A according to the present embodiment is different from the power supply device 7 according to the first embodiment described above, in that the ring terminal portion 76 on the positive side and the ring terminal portion 77 on the negative side are different from the ring terminal portion 76A on the positive side and the ring terminal portion 77 on the negative side. The difference is that each ring terminal portion 77A is replaced with a ring terminal portion 77A.

The ring terminal portion 76A on the positive electrode side and the ring terminal portion 77A on the negative electrode side may be integrated with the annular portion 703A of the resin portion 70A as described above.

The positive ring terminal portion 76A and the negative ring terminal portion 77A are arranged on the X2 side (that is, the side closer to the rotor core 312 of the rotor 310 in the axial direction) than the positive slip ring 71 and the negative slip ring 72. .

The ring terminal portion 76A on the positive electrode side is joined to the end of the lead wire 3161 (see FIG. 2) of the rotor winding 316 (the end on the positive electrode side of the rotor winding 316), and the ring terminal portion 77A on the negative electrode side is It is joined to the end (connection terminal on the negative electrode side of the rotor winding 316) of the lead wire 3162 (see FIG. 2) of the rotor winding 316.

The ring terminal portion 76A on the positive electrode side and the ring terminal portion 77A on the negative electrode side are continuous from the respective X2 side ends of the connection leg portion 81 and the connection leg portion 82, which will be described later, in a plane perpendicular to the rotation axis I and the rotation axis. Extends around I.

The ring terminal portion 76A on the positive electrode side and the ring terminal portion 77A on the negative electrode side extend over an angular range of 90 degrees or more around the rotation axis I. In this embodiment, the ring terminal portion 76A on the positive electrode side and the ring terminal portion 77A on the negative electrode side extend over an angular range of 360 degrees (approximately 180 degrees in this embodiment) and different from each other. Accordingly, in this embodiment, the ring terminal portion 76A on the positive electrode side and the ring terminal portion 77A on the negative electrode side extend at mutually different axial positions.

The ring terminal portion 76A on the positive electrode side and the ring terminal portion 77A on the negative electrode side are integrated into the annular portion 703A of the resin portion 70A, as described above. In this case, the ring terminal portion 76A on the positive electrode side is buried within the angular range of 360 degrees of the annular portion 703A, and the ring terminal portion 77A on the negative electrode side is buried within the angular range of 360 degrees of the annular portion 703A. Buried.

However, the ring terminal portion 76A on the positive electrode side and the ring terminal portion 77A on the negative electrode side are exposed to the outside in the radial direction through the plurality of radial openings 7031A and 7032A of the annular portion 703A. That is, the annular portion 703A has a plurality of openings 7031A and 7032A for partially exposing the positive electrode side ring terminal portion 76A and the negative electrode side ring terminal portion 77A to the outside in the radial direction. The form of the openings 7031A and 7032A may be similar to the opening 7031 of the power supply device 7 according to the first embodiment described above.

Each of the plurality of openings 7031A allows connection between the positive electrode side ring terminal portion 76A and the lead wire 3161 of the rotor winding 316, and each of the plurality of openings 7032A allows connection between the negative electrode side ring terminal portion 77A. and the lead wire 3162 of the rotor winding 316. For example, the lead wire 3161 forming the end of the positive electrode side of the rotor winding 316 is connected to the ring terminal portion 76A of the positive electrode side through one opening 7031A among the plurality of openings 7031A, and The lead wire 3162 forming the negative end of the wire 316 may be connected to the negative ring terminal portion 77A through one opening 7032A among the plurality of openings 7032A. Note that the connection method between the positive electrode side ring terminal portion 76A and the negative electrode side ring terminal portion 77A and the lead wires 3161 and 3162 of the rotor winding 316 is arbitrary, and they may be joined by soldering or the like. This may be achieved via connectors that may be placed in the openings 7031A, 7032A.

The openings 7031A and 7032A are preferably provided at equal pitches (equal angular pitches) in the circumferential direction, as shown in FIGS. 10 and 13. This can prevent rotational imbalance 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 are provided at 45-degree intervals, and a total of eight openings 7032A are provided at 45-degree intervals. However, in a modified example, the number and pitch of the openings 7031A and 7032A may be values different from those described above. Note that the plurality of openings 7031A and the plurality of openings 7032A may be formed at the same circumferential position as shown in FIG. 10.

In this way, in this embodiment, as in the first embodiment described above, the ring terminal portion 76A on the positive electrode side extends over an angular range of 90 degrees or more around the rotation axis I. The connection position between the ring terminal portion 76A on the positive electrode side and the lead wire 3161 of the rotor winding 316 can be set within an angular range of at least 1°. Similarly, the ring terminal portion 77A on the negative electrode side extends over an angular range of 90 degrees or more around the rotation axis I. The connection position between the rotor winding 316 and the lead wire 3162 of the rotor winding 316 can be set. Thereby, the connection between the ring terminal portions 76A and 77A on the positive and negative sides and the rotor winding 316 of the rotor 310 can be facilitated.

Specifically, as shown in FIG. 13, according to this embodiment, openings 7031A are formed at eight different positions in the circumferential direction with respect to the ring terminal portion 76A on the positive electrode side that extends over an angular range of 360 degrees. can be set. Here, in FIG. 13, for the purpose of explanation, eight openings 7031A provided for the ring terminal portion 76A on the positive electrode side are illustrated as openings 7031A-1 to 7031A-8. In this case, for example, when the lead wire 3161 (the end on the positive electrode side) of the rotor winding 316 is drawn out from near the position P1, the lead wire 3161 is connected to the positive electrode side through the opening 7031A-1 near the position P1. (see arrow R131). Similarly, when the lead wire 3161 (the end on the positive electrode side) of the rotor winding 316 is drawn out from, for example, near position P5, the lead wire 3161 passes through the opening 7031A-5 near position P5 to the positive electrode ring. It may be connected to the terminal portion 76A (see arrow R135), and the others may be connected in the same manner. In this way, by using the opening 7031A closest to the position where the lead wire 3161 (end on the positive side) of the rotor winding 316 is pulled out, the rotor winding 316 and the ring terminal section 76A on the positive side are connected. The wiring distance between the two can be shortened. That is, the length of the lead line 3161 can be shortened. Further, in this case, by forming a protrusion or the like on the end plate 313, the need to apply tension to the lead wire 3161 is reduced, so that the wiring of the lead wire 3161 can be facilitated. Furthermore, it is possible to prevent rotational imbalance of the rotor 310 that may occur due to protrusions or the like that may be formed on the end plate 313. This also applies to the lead wire 3162 on the negative electrode side.

In particular, according to this embodiment, the ring terminal portion 76A on the positive electrode side extends over an angular range of 360 degrees, so that the lead wire 3161 (end portion on the positive electrode side) of the rotor winding 316 can be placed at any circumferential position. Even when the lead wire 3161 is drawn out, efficient routing of the lead wire 3161 is possible. Similarly, the ring terminal portion 77A on the negative side extends over an angular range of 360 degrees, so when the lead wire 3162 (the end on the negative side) of the rotor winding 316 is pulled out at any circumferential position. However, it is possible to efficiently route the lead wire 3162.

Next, further effects of this embodiment will be described with reference to FIG. 14.

FIG. 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. FIG. 14 is an explanatory diagram as viewed in the axial direction along the rotation axis I, similarly to FIGS. 8, 8A, and 9 referred to in the first embodiment described above, and the illustration method is the same.

In the example shown in FIG. 14, the rotor winding 316 has four poles connected in parallel to the ring terminal portions 76A and 77A. In this case, for example, although the lead wires 3161 and 3162 at each position shown in FIG. It can be easily connected to the section 77A. For example, in the example shown in FIG. 14, the positive electrode side lead wires 3161 are placed at the second, fourth, sixth, and eighth openings in the clockwise direction of the eight openings 7031A that expose the positive ring terminal portion 76A. It is connected to the ring terminal portion 76A on the positive electrode side through each opening 7031A-2, 7031A-4, 7031A-6, and 7031A-8. Further, although the lead wires 3162 on the negative electrode side are not shown, they are similarly connected to the ring terminal portion 77A on the negative electrode side through the respective openings 7032A closest to each of them. In this embodiment, the connection methods and connection locations shown in FIGS. 8, 8A, and 9 referred to in the first embodiment described above can also be implemented in the same manner.

In this manner, 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. Further, according to this embodiment, the rotor windings 316 related to each pole can be formed independently from each other, so that productivity can be improved. Therefore, for example, as shown in FIG. 14, it is possible to wind the rotor windings 316 for each pole in the same direction, thereby improving manufacturability.

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

3... Rotating electrical machine (wound field type rotating electrical machine), 320... Stator, 310... Rotor, 312... Rotor core, 3122... Teeth part, 314... Shaft part, 316... ...Rotor winding (field winding), 64...Power supply circuit section (power control section, fixed side power supply device), 69...Brush (fixed side power supply device), 7...Rotating side power supply device, 70... resin part, 701... cylindrical part, 703, 703A... annular part, 7031, 7031A, 7032A... opening, 71... positive electrode side slip ring, 72 ...Negative pole side slip ring, 76, 76A...Ring terminal part (rotor connection part on the positive pole side), 77, 77A...Ring terminal part (rotor connection part on the negative pole side)

Claims (6)

A winding field type rotating electric machine,
stator and
A rotor core having a shaft portion, a rotor core coaxially fixed to the shaft portion, and a field winding wound around a plurality of teeth portions of the rotor core, and arranged coaxially with the stator and with a gap in the radial direction. a rotor that is
a rotation-side power supply device that is provided on the shaft portion so as to rotate together with the shaft portion, and includes a slip ring and a rotor connection portion that is connected to the field winding;
a fixed-side power supply device that includes a power control unit and a brush that is slidable on the slip ring and supplies power to the field winding together with the rotation-side power supply device;
The rotation side power supply device is
The slip rings on the positive electrode side and the negative electrode side each have an annular shape around the rotor axis;
the rotor connection portion on the positive side, which is arranged closer to the rotor in the axial direction than the slip rings on the positive side and the negative side, and is electrically connected to the slip ring on the positive side and the field winding;
the rotor connection portion on the negative side that is arranged closer to the rotor in the axial direction than the slip rings on the positive and negative sides, and electrically connected to the slip ring on the negative side and the field winding;
a resin portion that integrates the slip ring on the positive electrode side and the rotor connection portion on the positive electrode side, and the slip ring on the negative electrode side and the rotor connection portion on the negative electrode side;
The rotor connection portions on the positive pole side and the negative pole side each extend over an angular range of 90 degrees or more around the rotor axis. The resin part has a cylindrical part that holds the slip rings on the positive and negative sides, and an annular part that holds the rotor connection parts on the positive and negative sides,
1 . The annular portion has a radial opening around the rotor axis for electrically connecting the field winding to the rotor connecting portions on the positive and negative sides. The wire-wound field type rotating electric machine described in . The rotor connection portions on the positive electrode side and the negative electrode side extend over different angular ranges of 180 degrees or less around the rotor axis and at the same axial position, according to claim 1 or 2. Winding field type rotating electric machine. The wound field type rotating electric machine according to claim 1 or 2, wherein the rotor connection portions on the positive and negative sides extend over an angular range of 360 degrees around the rotor axis and at different axial positions. The winding field type according to any one of claims 1 to 4, wherein the winding direction of the field winding wound around the plurality of teeth is the same in the plurality of teeth. Rotating electric machine. A power supply device that can be attached to a rotor of a wound field type rotating electrical machine,
Slip rings on the positive and negative sides that can slide against the brush on the fixed side,
a rotor connection portion on the positive side that is arranged closer to the rotor in the axial direction than the slip rings on the positive side and the negative side, and 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 that is arranged closer to the rotor in the axial direction than the slip rings on the positive side and the negative side, and electrically connected to the slip ring on the negative side and the field winding;
a resin portion that integrates the slip ring on the positive electrode side and the rotor connection portion on the positive electrode side, and the slip ring on the negative electrode side and the rotor connection portion on the negative electrode side;
In the power supply device, the rotor connection portions on the positive electrode side and the negative electrode side each extend over an angular range of 90 degrees or more around the rotor axis.