Winding field motor

Abstract

To provide a technique capable of preventing deformation of a conductive member fixed to a rotor.SOLUTION: A winding field motor includes: a rotor that is fixed to a motor case and includes a stator that generates a magnetic field by energization, a rotor core around which a field coil is wound, and a rotor shaft to which the rotor core is assembled, is disposed on an inner diameter side of the stator and relatively rotatable with respect to the stator; and a power supply device that includes a rotor and a stator that rotate integrally with the rotor shaft, and is electrically connected to the field coil by a conductive member. The winding field motor is configured so that the conductive member extends toward an outer diameter side of the rotor, and the rotor includes: a fixing part that fixes the conductive member to the rotor; and a restricting part that restricts the movement of the conductive member in a direction away from the rotor on an inner diameter side of the fixing part.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a wound field motor. [Background technology]

[0002] Non-contact power supply devices have been known in the past (see, for example, Patent Document 1). Also known is a wound-field motor that uses a power supply device to supply power to a rotor coil, which generates a magnetic field to drive the motor. While various types of power supply devices can be used to supply power to the rotor coil, contact-type power supply devices that use brushes and commutators require measures to prevent brush wear and maintenance. On the other hand, using a non-contact power supply device to supply power to the rotor coil eliminates the need for brush maintenance, which is essential for contact-type devices. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2023 / 072539 Brochure Summary of the Invention [Problem to be solved by the invention]

[0004] Electromagnetic induction is often used to realize a contactless power supply device. When applying a contactless power supply device to a motor, it is expected that a configuration will be adopted in which power is supplied by electromagnetic induction while the motor continues to rotate. In such a configuration, a rotor that rotates together with the motor shaft is used, and a conductive member may be fixed to the rotor. When the conductive member is fixed to the rotor, an excess length is provided in the conductive member to ensure ease of assembly. However, when the rotor rotates with the conductive member fixed to the rotor, centrifugal force acts, causing deformation of the conductive member, which may result in interference with surrounding components, insufficient insulation distance, or damage to the conductive member.

[0005] The present invention has been made in view of the above-mentioned problems, and has an object to provide a technique capable of preventing deformation of a conductive member fixed to a rotor. [Means for solving the problem]

[0006] In order to achieve the above object, the wound-field motor includes a stator fixed to a motor case and generating a magnetic field when current is applied, a rotor core wound with a field coil, a rotor shaft to which the rotor core is assembled, a rotor arranged on the inner diameter side of the stator and rotatable relative to the stator, and a power supply device including a rotor and stator that rotate integrally with the rotor shaft and electrically connected to the field coil by a conductive member, wherein the conductive member extends toward the outer diameter side of the rotor, and the rotor includes a fixing portion that fixes the conductive member to the rotor, and a restricting portion that, on the inner diameter side of the fixing portion, restricts movement of the conductive member in a direction away from the rotor.

[0007] That is, in a configuration in which a conductive member extending toward the outer diameter side of the rotor is fixed to the rotor by a fixing portion, when centrifugal force acts on the conductive member located on the inner diameter side of the fixing portion due to rotation of the rotor, the centrifugal force acts as a force that deforms the conductive member. The conductive member is provided with an excess length to ensure ease of assembly. Therefore, when the conductive member extending toward the outer diameter side of the rotor is fixed by the fixing portion, the portion on the inner diameter side of the fixing portion has room to deform in a direction perpendicular to the radial direction of the rotor, i.e., in the axial direction. Therefore, when centrifugal force acts on the conductive member, it acts as a force that deforms the conductive member in the axial direction. Even if the conductive member deforms in the axial direction toward the rotor, it interferes with the rotor and the deformation is inhibited. Therefore, by restricting the movement of the conductive member in the axial direction away from the rotor with a restricting portion, deformation of the conductive member fixed to the rotor can be prevented. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a cross-sectional view of a wound field motor. [Figure 2] FIG. 1 is a cross-sectional view of a wound field motor. [Figure 3] FIG. 1 is a cross-sectional view of a wound field motor. [Figure 4] FIG. 4A is a cross-sectional view showing peripheral members of a conductive member, and FIG. 4B is a cross-sectional view showing an example in which the restricting portion is formed of a binding band. [Figure 5] FIG. 5A is a cross-sectional view showing peripheral members of a conductive member, and FIG. 5B is a cross-sectional view showing an example in which a restricting portion is formed of a plate-shaped member. DETAILED DESCRIPTION OF THE INVENTION

[0009] Here, the embodiments of the present invention will be described in the following order. (1) Structure of a wound field motor: (2) Structure for fixing conductive members: (3) Other embodiments:

[0010] (1) Structure of a wound field motor: 1 to 3 are cross-sectional views showing the wound-field motor 1 cut at a cross section including the rotation axis of the rotor shaft of the wound-field motor 1. In these cross-sectional views, hatching indicating a cross section has been omitted for some components (e.g., bearings, sealing members, etc.). Furthermore, in FIGS. 2 and 3, some components, such as the motor case and stator, have been omitted and the components inside the motor case are shown larger than in FIG. 1. Furthermore, the cut surfaces in FIGS. 2 and 3 are different.

[0011] The wound-field motor 1 includes a rotor 10, a conductive member 21, a guide member 20 for the conductive member 21, a support sleeve 30, a power supply device 40, and a motor case 60. The motor case 60 is shown in Fig. 1 but is omitted in other figures.

[0012] The rotor 10 includes a metallic rotor shaft 11. The rotor shaft 11 is a member that can rotate around a rotation axis Ax. In this specification, the direction parallel to the rotation axis Ax is called the axial direction, the direction perpendicular to the rotation axis Ax is called the radial direction, and the direction of rotation around the rotation axis Ax is called the circumferential direction. In addition, in the radial direction, the direction away from the rotation axis Ax is called the outer diameter side, and the direction approaching the rotation axis Ax is called the inner diameter side.

[0013] The motor case 60 includes a wet-side case 61 and a dry-side case 62. The wet-side case 61 houses the stator 70 and the rotor 10. The dry-side case 62 houses the power supply device 40 and a portion of the rotor shaft 11. The wet-side case 61 and the dry-side case 62 abut on end faces perpendicular to the axial direction, and the two cases are fixed together by fastening with screws or the like.

[0014] A stator 70 that generates a magnetic field when current is applied is fixed to the wet-side case 61. The stator includes a stator core (not shown), and a field coil is wound around the stator core. Power is supplied to the stator 70 from a stator power supply device (not shown), and a magnetic field is generated by the field coil (not shown) included in the stator 70.

[0015] The dry-side case 62 has an inner wall 62a extending radially inward from the outermost portion. A circular hole is formed on the inner diameter side of the inner wall 62a, and the rotor shaft 11 is inserted through this hole. The inner wall 62a is closed with a sealing member (described later), and therefore, as viewed from the inner wall 62a, a compartment on the stator 70 side and a compartment on the power supply device 40 side are separated in the axial direction. A refrigerant is supplied to the compartment on the stator 70 side via a refrigerant flow path 62b, and therefore the compartment on the stator 70 side is called a wet compartment. The refrigerant is a medium for transferring heat and also serves as a lubricant. A refrigerant is not supplied to the compartment on the power supply device 40 side, and therefore the compartment on the power supply device 40 side is called a dry compartment.

[0016] The rotor 10 includes a rotor core 12 around which a field coil 13 is wound, and a rotor shaft 11 to which the rotor core 12 is assembled. The rotor 10 is disposed on the inner diameter side of the stator 70 and is rotatable relative to the stator 70.

[0017] The rotor shaft 11 is configured by forming various shapes such as grooves at various locations on a member extending in one direction. One end of the rotor shaft 11 is formed with a groove 11a and a second groove located at a position rotated by a predetermined angle (e.g., 90°) from the groove 11a around the rotation axis Ax. The groove 11a and the second groove are grooves that extend in the axial direction. The groove 11a and the second groove have approximately constant circumferential widths and radial depths. The guide member 20 has a portion that fits into the groove 11a.

[0018] The guide member 20 is a resin member having portions 20a that respectively accommodate the two conductive members 21, and the portions 20a that accommodate the conductive members 21 are configured with a circumferential width and a radial height that allow them to fit into the grooves 11a. That is, when the guide member 20 is moved axially toward the rotor 10 while the portions 20a that accommodate the conductive members 21 are fitted into the grooves 11a, the conductive members 21 are guided axially and reach the inside of the rotor 10 while the portions 20a that accommodate the conductive members 21 are fitted into the grooves 11a. The conductive members 21 are then positioned so that the contacts 21a provided at the ends of the conductive members 21 can be electrically connected to the field coil 13 of the rotor core 12 inside the rotor 10.

[0019] The guide member 20 has two annular portions in addition to the portion 20a that houses the conductive member 21. The two annular portions have different diameters, and the annular portion 20b with the smaller diameter is housed in a metallic support sleeve 30.

[0020] The support sleeve 30 includes a cylindrical portion 30a, and the axis of the cylinder in the cylindrical portion 30a is arranged coaxially with the rotation axis Ax of the rotor shaft 11. In this embodiment, the cylindrical portion 30a has a cylindrical shape with a constant inner diameter over most of the portion, but the inner diameter becomes smaller at one end on the power supply device 40 side, and an annular portion 30b is formed. That is, the cylindrical portion 30a has an annular portion 30b having a hole through which the rotor shaft 11 is inserted, formed at one end on the power supply device 40 side in the axial direction, and the annular portion 30b forms the end face at one end on the power supply device 40 side in the axial direction.

[0021] The rotor shaft 11 is supported on the motor case 60 via a bearing 31 by a metal support sleeve 30 provided adjacent to the outer diameter of the rotor shaft 11. Specifically, the bearing 31 is arranged along the inner circumferential surface of a hole formed on the inner diameter side of the inner wall 62a of the dry-side case 62. The outer circumferential surface of a cylindrical portion 30a of the support sleeve 30 (the radially outer surface of the cylinder) is in contact with the inner circumferential surface of the bearing 31.

[0022] As a result, the support sleeve 30, which is disposed radially inward of the bearing 31, is rotatable about the rotation axis Ax together with the rotor shaft 11 and the conductive member 21 housed radially inward of the support sleeve 30. In other words, the rotor shaft 11 is rotatably supported by the support sleeve 30 with respect to the motor case 60 via the bearing 31.

[0023] In this embodiment, a seal member 32 is further disposed so as to contact the outer peripheral surface of the cylindrical portion 30a of the support sleeve 30. The seal member 32 is disposed axially closer to the power supply device 40 than the bearing 31. The seal member 32 closes the gap between the outer peripheral surface of the support sleeve 30 and the motor case 60. That is, a gap exists between the inner diameter side surface of the inner wall 62a of the dry-side case 62 and the outer peripheral surface of the cylindrical portion 30a of the support sleeve 30, and the seal member 32 fits into this gap. The seal member 32 also exists around the entire circumferential direction. Therefore, refrigerant present in the section closer to the bearing 31 than the seal member 32 does not enter the section closer to the power supply device 40 than the seal member 32. With the above configuration, the seal member 32 separates a dry section from a wet section within the motor case 60.

[0024] Power supply device 40 is a device that receives power from an external source via induced electromotive force due to electromagnetic induction and supplies the power to field coil 13 inside rotor 10. In this embodiment, power supply device 40 is attached to rotor shaft 11 and electrically connected to field coil 13 via conductive member 21. Power supply device 40 includes rotors 41 and 42 and a stator 50.

[0025] The rotor 41 is an annular member and includes a substrate 41a and a heat dissipation unit 41b. The substrate 41a is an annular printed circuit board that includes various wiring and has various electrical components mounted thereon. The heat dissipation unit 41b has an annular rotating body 41b1 and a cylindrical portion 41b2, and the annular axis of the annular rotating body 41b1 and the cylindrical axis of the cylindrical portion 41b2 are arranged coaxially with the rotation axis Ax. The annular rotating body 41b1 is a member that supports the substrate 41a.

[0026] Furthermore, the cylindrical portion 41b2 is formed on the inner diameter side of the annular rotor 41b1 and is formed so as to extend in the axial direction opposite to the rotor 10. The rotor shaft 11 can be inserted into the inner diameter side of the cylindrical portion 41b2. Specifically, a protrusion is formed on the inner peripheral surface of the cylindrical portion 41b2, the circumferential width and radial height of which are adjusted so as to fit into the second groove. In other words, when the rotor 41 is moved axially toward the rotor 10 while fitting the protrusion into the second groove, the rotor 41 can be assembled so as to rotate integrally with the rotor shaft 11.

[0027] The cylindrical portion 41b2 has a small diameter portion 41b21 and a large diameter portion 41b22. The large diameter portion 41b22 has a groove extending in the axial direction. The groove in the large diameter portion 41b22 provides a space for extending the conductive member 21 (described later) toward the outer diameter side.

[0028] The rotor 42 is an annular printed circuit board, and is equipped with an annular coil (not shown) in which electromotive force is induced by electromagnetic induction. The rotor 42 is a plate-like annular ring, and the small-diameter portion 41b21 of the cylindrical portion 41b2 of the rotor 41 can be inserted into a hole formed on the inner diameter side of the rotor 42. The inner diameter of the hole formed on the inner diameter side of the rotor 42 is slightly larger than the outer diameter of the small-diameter portion 41b21, and the small-diameter portion 41b21 is inserted into the hole formed on the inner diameter side of the rotor 42. The rotor 42 is fixed to the large-diameter portion 41b22 of the rotor 41 with screws or the like, with the small-diameter portion 41b21 inserted into the hole formed on the inner diameter side. Therefore, the rotors 41 and 42 rotate together.

[0029] The stator 50 includes a first stator 51 and a second stator 52. As shown in FIG. 1, the stator 50 is fixed to the motor case 60 (dry-side case 62) with screws or the like. The first stator 51 is disposed between the rotor 42 and the rotor 41. The second stator 52 is disposed on the opposite side of the rotor 42 from the rotor 10 in the axial direction. The first stator 51 and the second stator 52 are annular members and have shapes that are approximately symmetrical with respect to a plane perpendicular to the axial direction. The inner diameter of a hole formed on the inner diameter side of the first stator 51 is larger than the outer diameter of the large-diameter portion 41b22 of the cylindrical portion 41b2, and the large-diameter portion 41b22 is inserted into the hole formed on the inner diameter side of the first stator 51. The first stator 51 and the second stator 52 face each other, sandwiching the rotor 42, and are fixed with screws or the like. In this state, the rotor 42 is enclosed within the stator 50.

[0030] As shown in FIGS. 1 to 3, a substrate 52a is fixed to the second stator 52. An annular coil (not shown) is formed on the substrate 52a. Electric power is supplied to the substrate 52a from the outside, and a magnetic field is generated by the annular coil. Since an annular coil is also formed on the rotor 42, an induced electromotive force is generated in the annular coil of the rotor 42 due to the magnetic field generated by the substrate 52a, and power is supplied to a circuit mounted on the rotor 42. In other words, power is supplied to the power supply device 40.

[0031] Power supply device 40 includes rotor 42 and rotor 41, and the annular coil of rotor 42 is electrically connected to a circuit on substrate 41a of rotor 41 by wiring (not shown). Therefore, power supplied to the annular coil of rotor 42 is supplied to the circuit on substrate 41a. The circuit on substrate 41a includes rectifier diodes 41c and the like (see FIGS. 2 and 3). The circuit on substrate 41a uses rectifier diodes 41c and the like to generate power to be supplied to field coil 13 wound around rotor core 12.

[0032] The electric power is supplied to field coil 13 by conductive member 21. To supply electric power from the circuit on substrate 41a to field coil 13, conductive member 21 serves as an electrical conduction path extending from the circuit on substrate 41a to field coil 13. Specifically, conductive member 21 extends in the axial direction inside portion 20a of guide member 20, but is bent in the dry section and extends from the inner diameter side to the outer diameter side of rotor 41. The outer diameter side end of conductive member 21 is fixed to rotor 41 by fixing portion 41d (see FIG. 2).

[0033] (2) Structure for fixing conductive members: As described above, conductive member 21 is bent in the dry section and extends from the inner diameter side to the outer diameter side of rotor 41. Specifically, conductive member 21 has bus bar portion 21b, flexible cable portion 21c, and connection portion 21d that connects bus bar portion 21b and cable portion 21c. Fig. 4A is a diagram showing the peripheral members of conductive member 21 extracted from Fig. 2. However, for the sake of explanation, restricting portion 22, which will be described later, is omitted from Fig. 4A.

[0034] Busbar portion 21b has higher rigidity than cable portion 21c and is not intended to be bent artificially. In this embodiment, most of busbar portion 21b is housed in portion 20a of guide member 20 and is oriented to extend in the axial direction. One end of busbar portion 21b is contact point 21a for electrical connection to field coil 13. The other end of busbar portion 21b is connection portion 21d that is connected to cable portion 21c.

[0035] Cable portion 21c is a flexible, long cable made of flexible metal covered with an insulator. One end of cable portion 21c is electrically connected to busbar portion 21b at connection portion 21d. The other end of cable portion 21c is fixed to rotor 41 by fixed portion 41d. Fixed portion 41d is electrically connected to the circuit on substrate 41a. Therefore, the circuit on substrate 41a is electrically connected to field coil 13 via conductive member 21.

[0036] The fixing portion 41d is a member for fixing the conductive member 21 to the heat dissipation portion 41b of the rotor 41. Various forms of the fixing portion 41d are possible as long as it can fix the conductive member 21 to the heat dissipation portion 41b of the rotor 41. In this embodiment, the conductive member 21 is fixed to the rotating body 41b1 of the heat dissipation portion 41b. Also, in this embodiment, a round crimp terminal is used. That is, the end of the cable portion 21c is inserted into the insertion portion of the crimp terminal and crimped. The end of the cable portion 21c, i.e., the portion fixed to the fixing portion 41d, is called the fixed portion of the cable portion 21c.

[0037] Furthermore, a screw is inserted into a screw hole provided in the crimp terminal, and the crimp terminal is fixed to the rotating body 41b1 by the screw. Of course, various other modes can be adopted for the fixing portion 41d, and various fastening means or joining means such as an adhesive may be used.

[0038] 4A, it is assumed that the above-described configuration does not include a restricting unit 22, which will be described later. In this state, when the wound-field motor 1 operates, the rotor 41 and the conductive member 21 rotate together with the rotor 10. In this case, a centrifugal force acts on the conductive member 21.

[0039] Because the outer diameter side end of conductive member 21 is fixed to rotor 41 by fixed portion 41d, when centrifugal force acts on conductive member 21 in the absence of restricting portion 22, it acts as a force that deforms conductive member 21 on the inner diameter side of fixed portion 41d. To ensure ease of assembly, conductive member 21 is provided with an excess length as shown in Fig. 4A. That is, the length of cable portion 21c existing between fixed portion 41d and portion 20a of guide member 20 is determined and fixed to fixed portion 41d so that the length of cable portion 21c existing between fixed portion 41d and portion 20a of guide member 20 is longer than when cable portion 21c is provided at the shortest distance between fixed portion 41d and portion 20a of guide member 20.

[0040] Therefore, when the end of conductive member 21 is fixed to fixed portion 41d, the portion of fixed portion 41d on the inner diameter side may deform in the axial direction. Therefore, when rotor 41 rotates and centrifugal force acts on conductive member 21, conductive member 21 may deform, for example, as shown by the dashed line. Such deformation may cause interference with surrounding components, insufficient insulation distance, damage to conductive member 21, etc.

[0041] Therefore, in this embodiment, a restricting portion 22 is provided on the inner diameter side of the fixed portion 41d to restrict movement of the conductive member 21 in a direction away from the rotor 41 (see FIGS. 1 and 2). The restricting portion 22 is a member that restricts movement of the conductive member 21 in the axial direction in a direction away from the rotor 41.

[0042] The restricting portion 22 can be realized in various ways. Fig. 4B is a cross-sectional view taken along a line perpendicular to the radial direction, showing an example in which the restricting portion 22 is formed of a wrapper band 22a. Fig. 5A is a cross-sectional view similar to Fig. 4A, showing the wrapper band 22a as the restricting portion 22 without omitting it.

[0043] 4B and 5A, holes 22b for passing wrap straps 22a are formed in rotating body 41b1 of rotor 41. Holes 22b are formed on the inner diameter side of fixed portion 41d and open at two locations on rotating body 41b1 on the rotor 42 side in the axial direction. The openings of holes 22b on the rotor 42 side in the axial direction are circumferentially separated by a distance greater than the width of conductive member 21. Holes 22b also extend axially from the openings and are connected to extend circumferentially of rotating body 41b1 on the wet section side in the axial direction.

[0044] The hole 22b is a hole of a size that allows the cable tie 22a to be inserted therethrough. The size and shape of the hole 22b may be any shape as long as the cable tie 22a can be inserted therethrough. The shape of the cable tie 22a may be any shape, and a stopper or the like may be provided for inserting and fixing one end of the string-like cable tie 22a. The cable tie 22a goes around the outer periphery of the conductive member 21 and passes through the hole 22b.

[0045] In the above configuration, restricting portion 22 restricts movement of the portion of cable portion 21c that is radially inward from the fixed portion (portion Pc shown in FIG. 5A). With the above configuration, restricting portion 22 can prevent conductive member 21 from deforming in the axial direction away from rotor 41. Even if conductive member 21 deforms in the axial direction toward rotor 41, interference with rotor 41 inhibits the deformation. Therefore, with the above configuration, deformation of conductive member 21 can be prevented.

[0046] Furthermore, in this embodiment, the rotating body 41b1 is a member that supports the substrate 41a, and the conductive member 21 is fixed to the rotating body 41b1 by screws or the like that pass through the substrate 41a. Of the rotor 41, the substrate 41a is made of resin, and the rotating body 41b1 is made of metal. Furthermore, the rotating body 41b1 is longer in the axial and radial directions than the substrate 41a. Therefore, the rotating body 41b1 has higher rigidity than the substrate 41a. Therefore, the conductive member 21 can be stably fixed to the rotor 41 by adopting a configuration in which the conductive member 21 is fixed to the rotating body 41b1.

[0047] Furthermore, in this embodiment, the rotor 42 of the power supply device 40 includes an annular coil, and obtains electromotive force by electromagnetic induction from the annular coil included in the substrate 52a of the second stator 52. Therefore, in this embodiment, the rotor 42 of the power supply device 40 functions as a power-supplied part that receives power from an external source. In this embodiment, the substrate 41a and the rotating body 41b1 of the rotor 41 are located between the rotor 42, which is the power-supplied part, and the rotor core 12.

[0048] In this embodiment, the substrate 41a and the rotor 41b1 are annular members whose radial length is longer than their axial length. Therefore, the area of ​​the substrate 41a is larger on the outer diameter side than on the inner diameter side. Because multiple rectifier diodes 41c are used on the substrate 41a, if the rectifier diodes 41c are to be arranged on the inner diameter side, the area available for mounting would be small, and it would be necessary to line up multiple rectifier diodes 41c in the axial direction, which would increase the size of the wound-field motor 1 in the axial direction.

[0049] However, in this embodiment, since the substrate 41a is annular and has a large area on the outer diameter side, it is easy to mount multiple rectifier diodes 41c on the circuit on the substrate 41a if the area is on the outer diameter side. Therefore, in this embodiment, the axial thickness of the substrate 41a only needs to be thick enough to mount the circuit, and the substrate 41a can be configured to mount a circuit using rectifier diodes 41c without excessively increasing the axial length. In this case, the axial distance between the rotor 41 and the stator 50 can be reduced to a range that prevents interference with the circuits on the substrate 41a and ensures an insulation distance. As a result, the axial size of the wound-field motor 1 can be made compact.

[0050] As described above, in this embodiment, in order to make the axial size of wound-field motor 1 compact, substrate 41a and rotor 41b1 are configured in an annular shape, rectifier diode 41c is disposed on the outer diameter side of substrate 41a, and substrate 41a and rotor 41b1 are configured to be present axially between rotor 42 and rotor core 12. For this reason, conductive member 21, which electrically connects field coil 13 and substrate 41a, needs to be bent in the outer diameter direction around substrate 41a.

[0051] In this way, when the conductive member 21 is bent in the outer diameter direction, as described above, the centrifugal force acting on the conductive member 21 as the rotor 41 rotates acts as a force to deform the conductive member 21. However, in this embodiment, since the regulating portion 22 is attached, deformation of the conductive member 21 can be prevented.

[0052] (3) Other embodiments: The above embodiment is one example of how to implement the present invention, and various other embodiments are possible. For example, the restricting portion 22 can be realized in various forms other than the cable tie shown in FIG. 4B. As an example, a U-lock may be used as the restricting portion 22. That is, the U-lock is fixed in a state where the conductive member 21 is sandwiched between the U-lock and the rotating body 41b1. Even with this configuration, deformation of the conductive member 21 can be prevented.

[0053] Furthermore, the restricting portion 22 may be formed of a plate-like member. FIG. 5B is a diagram showing an example in which the restricting portion 22 is formed of a plate-like member 22c, and is a cross-sectional view taken along a line perpendicular to the radial direction. In the example shown in FIG. 5B, the rotating body 41b1 of the rotor 41 has two screw holes formed therein for fastening two screws 22d. The plate-like member 22c is made of a flexible material, such as a metal. The plate-like member 22c may be coated for insulation.

[0054] Plate-shaped member 22c is a rectangular member that is longer than the width of cable portion 21c of conductive member 21, and is bent into a shape that fits the outer periphery of conductive member 21. Plate-shaped member 22c has holes formed in two locations for inserting screws 22d. As shown in Fig. 5B, plate-shaped member 22c is bent into a shape that fits the outer periphery of conductive member 21, and is fixed by inserting screws 22d into the holes and fastening screws 22d to rotating body 41b1.

[0055] In the above configuration, restricting portion 22 restricts movement of the portion of cable portion 21c that is radially inward of the fixed portion. With the above configuration, restricting portion 22 can prevent conductive member 21 from deforming in the axial direction away from rotor 41. Even if conductive member 21 deforms in the axial direction toward rotor 41, interference with rotor 41 inhibits deformation. Therefore, with the above configuration, deformation of conductive member 21 can be prevented.

[0056] The stator is fixed to the motor case and can generate a magnetic field when current is applied. In other words, the stator is fixed so as not to rotate or move relative to the motor case. The stator also generates a magnetic field that interacts with the magnetic field generated by the rotor coil to apply torque to the rotor. Power can be supplied from any location, such as from a stator power supply device provided in the dry section or from a stator power supply device provided outside the motor case.

[0057] The rotor may be disposed on the inner diameter side of the stator and be rotatable relative to the stator. The rotor includes at least a rotor core and a rotor shaft, which rotate integrally. The rotor core may be a portion around which the field coil is wound, and may have various configurations such as a winding method, number of magnetic poles, number of slots, and material. The rotor shaft is a component to which the rotor core is attached, and rotates around the rotation axis. The rotor shaft may also be configured with any shape, material, etc.

[0058] The power supply device includes a rotor and a stator that rotate integrally with the rotor shaft and are electrically connected to the field coil via a conductive member. In other words, the power supply device is a device that receives power through electromagnetic induction, and it is sufficient if it can generate an induced electromotive force in the rotor due to the magnetic field generated by the stator. The rotor shaft is provided with a rotor core that includes a field coil to be powered. Since the rotor core rotates together with the rotor shaft, the power supply device is provided with a rotor and assembled to the rotor shaft to receive power while rotating. With this configuration, the rotor rotates together with the rotor shaft.

[0059] The conductive member may be any electrical conductor that supplies power from the power supply device to the field coil. Because the rotor shaft rotates, the conductive member may be configured to supply power from the power supply device to the field coil while rotating, and the conductive member also rotates together with the rotor and the rotor shaft.

[0060] The rotor includes a fixed portion that fixes the conductive member to the rotor, and a restricting portion that restricts movement of the conductive member in a direction away from the rotor on the inner diameter side of the fixed portion. That is, the conductive member extends in the radial direction of the rotor and is fixed to the fixed portion. Furthermore, on the inner diameter side of the fixed portion, the restricting portion prevents the conductive member from deforming in the axial direction away from the rotor.

[0061] The fixing portion may fix the conductive member in any manner. For example, a configuration can be adopted in which the conductive member is fixed by fixing a member that contacts at least a portion of the outer periphery of the conductive member to the rotor in any manner, such as fastening with screws or clamping members, welding, joining with adhesives, or locking. Alternatively, the conductive member itself may be joined to the rotor by welding, soldering, or the like. In any case, it is sufficient that the portion of the conductive member fixed by the fixing portion does not move or is difficult to move relative to the rotor.

[0062] The restricting portion may restrict the movement of the conductor portion in any manner. For example, a member that contacts at least a portion of the outer periphery of the conductive member may be fastened to the rotor in any manner, such as by fastening with a screw or a clamping member, welding, joining with an adhesive, or locking. In any case, when the conductive member is restricted by the restricting portion, it is sufficient that the conductive member does not move or is difficult to move in a direction away from the rotor. [Explanation of symbols]

[0063] 1...wound field motor, 10...rotor, 11...rotor shaft, 11a...groove, 12...rotor core, 13...field coil, 20...guide member, 21...conductive member, 21a...contact, 21b...busbar portion, 21c...cable portion, 21d...connection portion, 22...regulating portion, 22a...tie band, 22b...hole, 22c...plate-shaped member, 22d...screw, 30...support sleeve, 30b...annular portion, 31...bearing, 32...seal portion member, 40... power supply device, 41... rotor, 41a... substrate, 41b... heat dissipation portion, 41b1... rotating body, 41b21... small diameter portion, 41b22... large diameter portion, 41c... rectifier diode, 41d... fixed portion, 42... rotor, 50... stator, 51... first stator, 52... second stator, 52a... substrate, 60... motor case, 61... wet side case, 62... dry side case, 62a... inner wall, 62b... refrigerant flow path, 70... stator

Claims

1. a stator that is fixed to the motor case and generates a magnetic field when current is applied; a rotor including a rotor core wound with a field coil and a rotor shaft to which the rotor core is attached, the rotor being disposed on an inner diameter side of the stator and rotatable relative to the stator; a power supply device including a rotor and a stator that rotate integrally with the rotor shaft and are electrically connected to the field coil by a conductive member; A wound field motor including: the conductive member extends toward the outer diameter side of the rotor, the rotor includes a fixing portion that fixes the conductive member to the rotor, and a restricting portion that restricts movement of the conductive member in a direction away from the rotor, on an inner diameter side of the fixing portion. Wound field motor.

2. the conductive member has a bus bar portion, a flexible cable portion, and a connection portion that connects the bus bar portion and the cable portion, the cable portion is bent and extends toward the outer diameter side of the rotor, the fixing portion fixes the fixed portion of the cable portion to the rotor, the restricting portion restricts movement of a portion of the cable portion that is radially inward from the fixed portion; 2. The wound field motor according to claim 1.

3. the rotor includes a substrate and a rotating body that supports the substrate, and the fixing portion fixes the conductive member to the rotating body.

3. The wound field motor according to claim 1 or 2.

4. the power supply device includes a power-receiving unit that receives power from an external source; The substrate and the rotating body are present between the power-supplying part and the rotor core.

4. The wound field motor according to claim 3.

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