Winding field motor

Abstract

To provide a technique capable of supporting a rotor shaft in a motor case without using a bearing having a complicated shape.SOLUTION: A winding field motor includes: a stator fixed to a motor case and configured to generate a magnetic field by energization; a rotor core around which a field coil is wound; a rotor shaft to which the rotor core is attached; and a power supply device attached to the rotor shaft and electrically connected to the field coil by a conductive member, and a rotor which is disposed on an inner diameter side of the stator and is rotatable relative to the stator. The rotor shaft is supported by the motor case via a bearing by a support sleeve provided on an outer periphery of the rotor shaft. The support sleeve accommodates at least the rotor shaft and the conductive member on an inner diameter side, and a seal member for closing a gap between an outer peripheral surface of the support sleeve and the motor case is disposed on a side of the power supply device with respect to the bearing in an axial direction.SELECTED DRAWING: Figure 1

Description

[Technical Field]

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

[0002] Conventionally, a wound-field motor is known, which is driven by supplying power to a rotor coil using a power supply device and generating a magnetic field with the rotor coil. In a wound-field motor, while it is necessary to supply power to the coil using a power supply device, it is also necessary to cool the rotor, including the coil, with a refrigerant. For this reason, a seal separates the compartment where the refrigerant is present from the compartment where the power supply device is present. For example, Patent Document 1 discloses a configuration in which a seal 60 separates a dry compartment, which includes a commutator 20 and brushes 25, from a wet compartment, which is cooled by the refrigerant. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] French Patent Application Publication No. 3114926 Summary of the Invention [Problem to be solved by the invention]

[0004] In conventional technology, bearings with complex configurations are used to separate the dry and wet compartments, making it difficult to improve the durability of the bearings. Specifically, the inner ring (inner race) 32 of the bearing 30 in the conventional technology is longer in the axial direction than the outer ring (outer race) 31, reaching the position where it contacts the seal 60. Therefore, compared to a configuration in which the axial length of the inner ring 32 is the same as that of the outer ring 31, there is a greater possibility that the inner ring 32 will deform when centrifugal force acts on the inner ring 32 from the shaft 10 or commutator 20 as the bearing rotates. If the inner ring 32 deforms, the operation of the bearing 30 via the balls 33 will no longer be proper, and the durability of the bearing 30 will likely decrease.

[0005] The present invention has been made in view of the above-mentioned problems, and has an object to provide a technique that enables a rotor shaft to be supported in a motor case without using a bearing with a complex shape. [Means for solving the problem]

[0006] In order to achieve the above object, a 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 power supply device assembled to the rotor shaft and electrically connected to the field coil by a conductive member, and a rotor arranged on the inner diameter side of the stator and rotatable relative to the stator, wherein the rotor shaft is journaled to the motor case via a bearing by a journal sleeve provided on the outer periphery of the rotor shaft, the journal sleeve houses at least the rotor shaft and the conductive member on its inner diameter side, and a seal member that closes a gap between the outer circumferential surface of the journal sleeve and the motor case is arranged axially closer to the power supply device than the bearing.

[0007] That is, in a configuration in which the rotor shaft is supported on the motor case via a bearing by a support sleeve, a seal member and a bearing are aligned in the axial direction on the outer peripheral surface of the support sleeve. With this configuration, the gap between the outer peripheral surface of the support sleeve and the motor case is closed by the seal member, eliminating the need for a seal member between the inner race of the bearing and the motor case, as in conventional technology. This allows the rotor shaft to be supported by a bearing of a normal structure in which the axial lengths of the inner race and the outer race are equal. This makes it possible to support the rotor shaft on the motor case without using a bearing with a complex shape. [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. 4 is a cross-sectional view showing a state before a rotor shaft is inserted into the inner diameter side of a bearing. 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) Configuration of the support sleeve: (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, a cover 50, 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, the cover 50, etc. The wet-side case 61 and the dry-side case 62 abut at end faces perpendicular to the axial direction, separating the outside from the inside of the motor case 60.

[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 wound with a field coil 13, a rotor shaft 11 to which the rotor core 12 is attached, and a power supply device 40 attached to the rotor shaft 11 and electrically connected to the field coil 13 by a conductive member 21. 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 power supply device 40 is a device that receives power from the outside by induced electromotive force due to electromagnetic induction, and supplies the power to the field coil 13 inside the rotor 10. In this embodiment, the power supply device 40 includes rotors 41 and 42.

[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 cover 50 includes a first cover 51 and a second cover 52. The first cover 51 is disposed between the rotor 42 and the rotor 41. As shown in FIG. 1, the cover 50 is fixed to the motor case 60 (dry-side case 62) with screws or the like. The second cover 52 is disposed on the opposite side of the rotor 42 from the rotor 10 in the axial direction. The first cover 51 and the second cover 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 cover 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 cover 51. The first cover 51 and the second cover 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 cover 50.

[0027] As shown in FIGS. 1 to 3, a substrate 52a is fixed to the second cover 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 the rotor 42 also has an annular coil formed thereon, an induced electromotive force is generated in the annular coil of the rotor 42 by 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) Configuration of the support sleeve: In the above configuration, the rotor shaft 11 is supported on the motor case 60 via a bearing 31 by a support sleeve 30 provided on the outer periphery 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 support sleeve 30 (the surface on the radially outer side of the cylinder) is in contact with the inner circumferential surface of the bearing 31.

[0031] 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.

[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 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 power supply device 40 side 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] Because refrigerant is supplied to the bearing 31 located in the wet compartment, the wound-field motor 1 operates with refrigerant present on the bearing 31 and around it. In this embodiment, the bearing 31 and the seal member 32 both abut against the outer peripheral surface of the support sleeve 30. This outer peripheral surface is the radially outer surface of the cylindrical portion 30a of the support sleeve 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 support sleeve 30 can serve as both the contact surface with the bearing 31 and the contact surface with the seal member 32.

[0034] Therefore, without using a bearing with a special structure in which the inner ring is axially longer than the outer ring as in Patent Document 1, it is possible to support the journal sleeve 30 with the bearing 31 and separate the dry compartment and the wet compartment with the seal member 32. That is, in this embodiment, the journal sleeve 30 and the rotor shaft 11 can be supported using a normal bearing 31 that has an inner race 31a and an outer race 31b that have the same axial length.

[0035] With the above configuration, it is possible to support the rotor shaft 11 in the motor case 60 without using a bearing with a complex shape. Therefore, compared to using a bearing with a special structure in which the inner ring is axially longer than the outer race, it is possible to reduce the possibility that the force generated by the rotation of the rotor 10 will damage, deform, or destabilize the bearing 31. Furthermore, compared to using a bearing with a special structure in which the inner ring is axially longer than the outer race, it is possible to provide a support structure with higher durability.

[0036] Furthermore, the bearing sleeve 30 according to this embodiment has a cylindrical portion 30a, and the cross section perpendicular to the axial direction has a circular shape, and the radius of the circle is constant along the axial direction. That is, in the cross section shown in Figures 1 to 3, the line formed on the outermost side of the cylindrical portion 30a is a straight line parallel to the axial direction.

[0037] Therefore, in this embodiment, with the rotor shaft 11 housed inside the support sleeve 30, the support sleeve 30 can be easily inserted into the inner diameter side of the bearing 31. Fig. 4 is a cross-sectional view showing the rotor shaft 11 before it is inserted into the inner diameter side of the bearing 31. Fig. 4 shows the rotor shaft 11 in the state before insertion, with some parts removed from Fig. 3.

[0038] In this embodiment, the outer peripheral surface of the cylindrical portion 30a is chamfered at the end portion on the power supply device 40 side in the axial direction. The chamfered portion is referred to as a chamfered portion 30c. As shown in Fig. 4, the bearing 31 and the seal member 32 are fitted in advance to the inner peripheral surface of the inner wall 62a of the dry-side case 62, and with the rotor shaft 11 housed on the inner diameter side of the support sleeve 30, the rotor shaft 11 is moved toward the power supply device 40.

[0039] When the support sleeve 30 is not in contact with the inner diameter side of the bearing 31, the dry-side case 62 and the rotor shaft 11 are in contact with each other, and so their relative positional relationship is not determined. When the support sleeve 30 approaches the bearing 31 and the chamfered portion 30c comes into contact with the bearing 31, the support sleeve 30 is positioned on the inner diameter side of the bearing 31. Furthermore, when the rotor shaft 11 is moved, the support sleeve 30 moves toward the power supply device 40 while fitting into the inner diameter side of the bearing 31.

[0040] The outer peripheral surface of the support sleeve 30 is the outer peripheral surface of the cylindrical portion 30a, and a hole of a fixed diameter is formed on the inner diameter side of the bearing 31. Therefore, the support sleeve 30 penetrates the hole on the inner diameter side of the bearing 31, thereby positioning the rotor shaft 11, i.e., axial centering. As the rotor shaft 11 moves further, the chamfered portion 30c comes into contact with the seal member 32 and spreads the seal member 32 toward the outer circumference. Because the support sleeve 30 has the chamfered portion 30c, the seal member 32 can be spread toward the outer circumference without being caught or damaged as the support sleeve 30 moves axially. Furthermore, the support sleeve 30 comes into contact with the bearing 31 before the seal member 32, and contacts the seal member 32 in a state where the axis is centered. Therefore, the support sleeve 30 is not pressed against the seal member 32 in an inappropriate direction, and the seal member 32 can be deformed without being damaged.

[0041] Furthermore, in this embodiment, the rotor shaft 11 housed inside the support sleeve 30 stabilizes the support sleeve 30 on the inner diameter side of the bearing 31 during operation of the wound-field motor 1. Specifically, the rotor shaft 11 has a press-fit portion 14 press-fitted into the inner circumferential surface of the support sleeve 30 (see FIG. 3).

[0042] The rotor shaft 11, with the guide member 20 attached, is press-fitted into the support sleeve 30. That is, after the rotor shaft 11 is manufactured so that the outer diameter thereof is slightly larger than the inner diameter of the support sleeve 30, the rotor shaft 11 is press-fitted into the inner diameter side of the support sleeve 30 by an interference fit. The press-fitted portion is called a press-fit portion 14.

[0043] In this embodiment, a portion of a predetermined length in the axial direction around the rotation axis Ax is configured to be the press-fit portion 14, and the bearing 31 is configured to be located on the outer diameter side of the press-fit portion 14. Therefore, in the portion where the bearing 31 is located, the bearing 31, the support sleeve 30, and the press-fit portion 14 are lined up without any gaps from the outer radial outside to the inner radial inside. The rotor shaft 11 and the support sleeve 30 located on the inner diameter side of the bearing 31 are made of metal. Therefore, in this embodiment, the members located on the inner diameter side of the bearing 31 are harder than the resin guide member 20, and even when the wound-field motor 1 rotates and centrifugal force acts on the rotor shaft 11 and the support sleeve 30, gaps are unlikely to form between the parts on the radial inside of the bearing 31. As a result, the possibility of damage to the components on the inner diameter side of the bearing 31, i.e., the components related to the support of the rotor shaft 11, is reduced compared to when the rotor shaft 11 is not pressed into the support sleeve 30 on the radial inside of the bearing 31 or when the radial inside of the bearing 31 is supported by a plastic part.

[0044] (3) Other embodiments: The above embodiment is one example for carrying out the present invention, and various other embodiments are also possible. For example, the shape of the support sleeve is not limited to the shapes in the above-described embodiments. For example, the inner diameter side may have a structure for coupling with a guide member or a rotor shaft. Furthermore, the support sleeve 30 is not limited to a cylindrical shape. For example, the support sleeve 30 may have a shape in which the inner diameter and outer diameter gradually decrease in the axial direction.

[0045] 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.

[0046] 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, a rotor shaft, and a power supply device, 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.

[0047] The power supply device is a device attached to the rotor shaft and electrically connected to the field coil via a conductive member. That is, the power supply device receives power from or generates power from a part other than the power supply device, and then supplies the power to the field coil using the conductive member. Furthermore, since the power supply device is attached to the rotor shaft, it rotates together with the rotor shaft. Although the components for power supply may include non-rotating components (for example, components fixed to the motor case), in this specification, the rotating parts are referred to as the power supply device.

[0048] The conductive member may be any electrical conductor that supplies power provided by a power supply device to the field coil. Since 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 shaft. To rotate the conductive member together with the rotor shaft, the conductive member is housed on the inner diameter side of the support sleeve.

[0049] The support sleeve may be provided on the outer periphery of the rotor shaft and may support the rotor shaft on the motor case via a bearing. That is, the outer periphery of the support sleeve is configured to contact at least the bearing and the seal member, to make one revolution in the circumferential direction around the axis of the rotor shaft, and to support the rotor shaft over the entire revolution. As long as this is the case, the support sleeve may have various shapes.

[0050] The rotor shaft is supported by the support sleeve via a bearing. That is, the outer circumferential surface of the support sleeve is press-fitted onto the inner circumferential surface of the inner race of the bearing, or the outer circumferential surface is in slidable contact with the inner circumferential surface, thereby supporting the support sleeve on the inner diameter side of the inner race. The rotor shaft is housed on the inner diameter side of the support sleeve, and the support sleeve rotates together with the rotor shaft, so that the rotor shaft is supported by the support sleeve and is also supported by the motor case via the bearing.

[0051] The inner diameter side of the support sleeve accommodates a conductive member together with the rotor shaft. That is, a bearing is located on the outer diameter side of the support sleeve, and its inner race side rotates with the rotor shaft while its outer race side is fixed to the motor case, so the inner diameter side of the bearing rotates and the outer diameter side is fixed. Therefore, the conductive member that rotates with the rotor shaft is also accommodated on the inner diameter side of the support sleeve. That is, because the power supply device and rotor core rotate with the rotor shaft, the conductive member is also arranged on the inner diameter side of the support sleeve so that it rotates with the rotor shaft. Of course, if there are other members that should rotate with the rotor shaft, they may be accommodated on the inner diameter side of the support sleeve.

[0052] The seal member is disposed axially closer to the power supply device than the bearing and is required to close the gap between the outer circumferential surface of the bearing sleeve and the motor case, i.e., to prevent refrigerant from entering the dry compartment from the wet compartment and to separate the dry compartment from the wet compartment. [Explanation of symbols]

[0053] 1...wound field motor, 4...housing, 10...housing, 11...connector, 12...recess, 12a...inner wall, 12b...bottom, 13...first terminal hole, 14...first fastening hole, 15...terminal, 20...intervening member, 21...insertion portion, 21a...second terminal hole, 22...second fastening hole, 22a...second fastening hole, 23...protrusion, 30...board, 31...screw, 32...through hole, 33...third fastening hole, 33a...third fastening hole

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, a rotor shaft to which the rotor core is attached, and a power supply device attached to the rotor shaft and electrically connected to the field coil by a conductive member, the rotor being disposed on an inner diameter side of the stator and rotatable relative to the stator; A wound field motor including: the rotor shaft is supported by the motor case via a bearing at a support sleeve provided on the outer periphery of the rotor shaft, the support sleeve accommodates at least the rotor shaft and the conductive member on its inner diameter side; a seal member for closing a gap between an outer peripheral surface of the support sleeve and the motor case is disposed axially closer to the power supply device than the bearing; Wound field motor.

2. the support sleeve has a cylindrical portion disposed coaxially with the rotation axis of the rotor shaft, The outer circumferential surface is a radially outer surface of the cylindrical shape.

2. The wound field motor according to claim 1.

3. The outer circumferential surface of the cylindrical portion is chamfered at an end portion on the power supply device side in the axial direction.

3. The wound field motor according to claim 2.

4. the rotor shaft has a press-fit portion press-fitted into an inner peripheral surface of the support sleeve, The bearing is located on the outer diameter side of the press-fit portion.

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

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