Winding field motor

Abstract

To provide a technique capable of cooling a power supply device without using a refrigerant.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 supplies an electric power to the field coil. The winding field motor is configured such that a first portion of the rotor shaft including a portion in which the rotor is assembled is disposed in a dry section in which intrusion of refrigerant is prevented in the motor case, a second portion of the rotor shaft including the rotor core is disposed in a wet section in which the refrigerant flows in the motor case, and a heat transfer member provided from the dry section to the wet section is provided adjacent to an outer diameter of the rotor shaft.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 contactless power supply devices. Because various electrical circuits are used in power supply devices, it is undesirable to place the power supply device in a location where it comes into direct contact with a refrigerant. Meanwhile, the stator and rotor of a motor are configured so that a liquid refrigerant comes into direct contact with and circulates through them for cooling purposes. For this reason, in motors using contactless power supply devices, the power supply device is installed in a dry section where the refrigerant does not enter, and the stator and rotor are installed in a wet section where they are cooled by the refrigerant. However, the electrical circuits in the power supply device contain electrical components that generate heat, making it necessary to efficiently cool the power supply device.

[0005] The present invention has been made in view of the above-mentioned problems, and has an object to provide a technique that can cool a power supply device without using a refrigerant. [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 attached, 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 a stator that rotate integrally with the rotor shaft and supplies power to the field coil, wherein a first portion of the rotor shaft including the portion to which the rotor is attached is arranged in a dry compartment within the motor case where refrigerant is prevented from entering, and a second portion of the rotor shaft including the rotor core is arranged in a wet compartment within the motor case into which refrigerant flows, and the motor is provided with a heat transfer member provided adjacent to the outer diameter of the rotor shaft and spanning from the dry compartment to the wet compartment.

[0007] That is, the rotor shaft is disposed from the dry compartment to the wet compartment, and the heat transfer member is disposed adjacent to the outer diameter of the rotor shaft from the dry compartment to the wet compartment. Therefore, heat generated in the dry compartment is transferred to the wet compartment through the heat transfer member. Because the wet compartment is a compartment into which a refrigerant flows, the heat transferred to the wet compartment through the heat transfer member is cooled by the refrigerant and transferred to various parts of the wet compartment, and then the heat is transferred to other parts. With the above configuration, it is possible to cool the power supply device located in the dry compartment without using a refrigerant. [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. 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) Heat transfer component configuration: (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 heat transfer member 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 the heat transfer member 30 made of metal.

[0020] The heat transfer member 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, forming an annular portion 30b. 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] 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.

[0022] 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.

[0023] 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.

[0024] The cylindrical portion 41b2 has a small diameter portion 41b21 and a large diameter portion 41b22. The large diameter portion 41b22 has a groove formed therein that extends in the axial direction.

[0025] 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.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] 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).

[0030] (2) Heat transfer component configuration: In the above configuration, the rotor shaft 11 is journaled to the motor case 60 via a bearing 31 by a metal heat transfer member 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 the cylindrical portion 30a of the heat transfer member 30 (the radially outer surface of the cylinder) is in contact with the inner circumferential surface of the bearing 31.

[0031] As a result, the heat transfer member 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, which are housed radially inward of the heat transfer member 30. In other words, the rotor shaft 11 is rotatably supported by the heat transfer member 30 with respect to the motor case 60 via the bearing 31.

[0032] 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 heat transfer member 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 heat transfer member 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 cylindrical portion 30a of the heat transfer member 30, and the seal member 32 fits into this gap. The seal member 32 also exists around the entire circumferential direction. Therefore, the 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 the dry section and the wet section within the motor case 60.

[0033] As described above, the refrigerant is supplied to the bearing 31, and the wound-field motor 1 operates with the refrigerant present in and around the bearing 31. In this embodiment, the bearing 31 and the seal member 32 both abut against the outer peripheral surface of the heat transfer member 30. This outer peripheral surface is the radially outer surface of the cylindrical portion 30a of the heat transfer member 30. Therefore, the surfaces on which the bearing 31 and the seal member 32 abut can be configured by a very simple surface formed in the circumferential direction around the rotation axis Ax. As a result, the outer peripheral surface of the heat transfer member 30 can serve as both the contact surface with the bearing 31 and the contact surface with the seal member 32.

[0034] In the above configuration, the rotor shaft 11 is disposed across both the dry compartment and the wet compartment within the motor case 60. In this embodiment, the portion of the rotor shaft 11 that is present on the dry compartment side is referred to as the first portion, and the portion that is present on the wet compartment side is referred to as the second portion. In Figure 3, the boundary between the dry compartment and the wet compartment is indicated by a dashed line, and the first portion and the second portion are indicated near the dashed line.

[0035] The heat transfer member 30 is provided axially from the dry compartment to the wet compartment. In this embodiment, the heat transfer member 30 is made of metal and has higher thermal conductivity than the guide member 20, which is made of resin. Therefore, the dry compartment and the wet compartment are not spatially connected, and the refrigerant in the wet compartment is prevented from entering the dry compartment, but heat can be transferred between the two compartments.

[0036] During operation of the wound-field motor 1, the power supply device 40 in the dry compartment generates heat. That is, the circuits on the substrate 41a of the rotor 41, such as the rectifier diode 41c, generate heat. Meanwhile, the field coil 13 and other components in the wet compartment may also generate heat, but a refrigerant is supplied to the wet compartment, and the refrigerant acts as a heat transfer medium, transferring the heat to other parts, such as the outside of the motor case 60. For this reason, during operation of the wound-field motor 1, the average temperature of the wet compartment is lower than the average temperature of the dry compartment. Therefore, heat generated in the dry compartment can move toward the wet compartment.

[0037] In this embodiment, the metal heat transfer member 30 is present in both the dry compartment and the wet compartment, so that heat generated in the dry compartment is transferred to the wet compartment via the heat transfer member 30. With the above configuration, it is possible to cool the power supply device 40 without using a refrigerant.

[0038] Furthermore, in this embodiment, the heat transfer member 30 is in direct contact with the refrigerant in the wet compartment. Specifically, the refrigerant flow path 62b formed in the inner wall 62a of the dry-side case 62 has a flow path that supplies refrigerant between the seal member 32 and the bearing 31. The refrigerant circulates through the bearing 31 and other components within the wet compartment. Therefore, heat generated in the power supply device 40 moves to the refrigerant in contact with the outer peripheral surface of the heat transfer member 30 during the process of heat transfer through the heat transfer member 30. Therefore, in this embodiment, heat from the dry compartment can be transferred more efficiently to areas other than the dry compartment than in a configuration in which the refrigerant does not come into direct contact with the heat transfer member 30.

[0039] Furthermore, this embodiment includes a configuration for efficiently transferring heat generated in the power supply device 40 to the heat transfer member 30. Specifically, the circuit on the substrate 41a of the rotor 41 includes the rectifier diodes 41c and the like as described above, and the rectifier diodes 41c and the like generate heat. Therefore, in the rotor 41, the substrate 41a (the circuit on the substrate 41a) is the heat-generating part.

[0040] On the other hand, heat dissipation portion 41b of rotor 41 is made of metal and has a higher thermal conductivity than resin components, etc. Therefore, heat dissipation portion 41b can dissipate heat generated in substrate 41a, which is a heat-generating portion. As described above, cylindrical portion 30a of heat transfer member 30 has an annular portion 30b having a hole through which rotor shaft 11 is inserted, formed at one end on the power supply device 40 side in the axial direction. The annular portion 30b forms the end face at one end on the power supply device 40 side in the axial direction.

[0041] In this embodiment, the axial end face of the annular portion 30b contacts the annular rotating body 41b1 of the heat dissipation portion 41b (see FIGS. 2 and 3). Therefore, heat generated in the circuit on the substrate 41a is dissipated to the heat dissipation portion 41b, transferred through the heat dissipation portion 41b, and then transferred to the heat transfer member 30. The heat that reaches the heat transfer member 30 is transferred toward the wet compartment, which is the low-temperature side, and to the refrigerant that is in direct contact with the heat transfer member 30. With the above configuration, heat can be dissipated to the refrigerant via the heat dissipation portion 41b, which is in thermal contact with the substrate 41a, which is a heat-generating portion, and the heat transfer member 30, making it possible to efficiently transfer heat from the dry compartment to areas other than the dry compartment.

[0042] (3) Other embodiments: The above embodiment is one example for carrying out the present invention, and various other embodiments are possible. For example, the shape of the heat transfer member is not limited to the shapes in the above-described embodiment, and may have a structure on the inner diameter side for coupling with a guide member or a rotor shaft. Furthermore, the rotating body 41b1 may be configured with a plurality of grooves, holes, various structures, etc., to increase the surface area compared to a case without these structures. Furthermore, the heat transfer member is not limited to a cylindrical shape.

[0043] 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.

[0044] 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.

[0045] The power supply device includes a rotor and a stator that rotate integrally with the rotor shaft and supplies power to the field coil. That is, the power supply device is a device that receives power through electromagnetic induction and is only required to 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 the field coil to be powered, and the rotor core rotates together with the rotor shaft. Therefore, in order to receive power while rotating, the power supply device is provided with a rotor and assembled to the rotor shaft. With this configuration, the rotor rotates together with the rotor shaft.

[0046] A wound-field motor has a dry section to which no refrigerant is supplied and a wet section to which a refrigerant is supplied, and the rotor shaft extends across the dry section and the wet section. The refrigerant is a heat transfer medium and is liquid, so it can enter various parts of the wet section. A structure for circulating the refrigerant may be provided within the wet section.

[0047] The portion of the rotor shaft arranged in the dry compartment may be the first portion, and the portion arranged in the wet compartment may be the second portion. The first portion and the second portion may be different portions of the rotor shaft, and may be distinguished by the boundary between the dry compartment and the wet compartment in the axial direction.

[0048] The motor case is not limited to a specific shape or size as long as it has at least a dry compartment and a wet compartment. In the above-described embodiment, the dry compartment and the wet compartment are separated by the wall surface of the motor case and the seal member, but the compartments may be separated by other structures, such as an O-ring or other type of seal.

[0049] The heat transfer member may be provided adjacent to the outer diameter of the rotor shaft and extending from the dry compartment to the wet compartment. That is, the heat transfer member is located on the outer diameter side of the rotor shaft, so that heat from the dry compartment is transferred to the heat transfer member on the outer circumferential side of the rotor shaft. The heat transfer member is also located across the dry compartment and the wet compartment, so that heat transferred to the heat transfer member on the dry compartment side is transferred to the wet compartment side. That is, the refrigerant may flow into the wet compartment, and the wet compartment may be configured to be at a lower temperature than the dry compartment, so that heat is transferred from the dry compartment to the wet compartment.

[0050] The heat transfer member is adjacent to the outer diameter of the rotor shaft. That is, the rotor shaft and the heat transfer member are in direct contact with each other so that heat can be transferred. Examples of such a configuration include a configuration in which the rotor shaft is press-fitted into the heat transfer member or a configuration in which the rotor shaft is slidably adjacent to the heat transfer member. With this configuration, heat is transferred from the heat transfer member to the rotor shaft, and heat can also be transferred from the dry compartment to the wet compartment via the rotor shaft. [Explanation of symbols]

[0051] 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, 30...heat transfer member, 30b...annular portion, 31...bearing, 32...sealing 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 that supplies power to the field coil; A wound field motor including: a first portion of the rotor shaft including a portion where the rotor is assembled is disposed in a dry section within the motor case, the dry section being prevented from entering a refrigerant; a second portion of the rotor shaft including the rotor core is disposed in a wet section within the motor case into which the refrigerant flows; a heat transfer member provided adjacent to an outer diameter of the rotor shaft and spanning from the dry section to the wet section; Wound field motor.

2. The heat transfer member directly contacts the refrigerant in the wet section.

2. The wound field motor according to claim 1.

3. the heat transfer member includes a cylindrical portion that is arranged coaxially with the rotation axis of the rotor shaft, a seal member is disposed to close a gap between the outer circumferential surface of the cylindrical portion and the motor case; 3. The wound field motor according to claim 1 or 2.

4. the rotor includes a heat generating portion and a heat dissipating portion in contact with the heat generating portion, the heat transfer member includes an annular portion that forms an end surface at one axial end of the cylindrical portion and has a hole through which the rotor shaft is inserted, The heat dissipation portion and the annular portion are in contact with each other.

4. The wound field motor according to claim 3.

Images