Winding-field type rotary electric machine

Abstract

To provide a winding-field type rotary electric machine capable of appropriately protecting an electric component from a refrigerant in a rotor and achieving high cooling performance.SOLUTION: In a rotary electric machine, a refrigerant is injected from an axial direction toward an axial direction end of a rotor. A circuit module 106 having an electric component is provided at a position facing an axial direction end of a field winding in the rotor in a state of being fixed to a rotating shaft. The circuit module 106 includes a component holder 141 that accommodates the electric component. A heat dissipation plate 151 is fixed to one end surface of end surfaces on both sides in the axial direction of the component holder 141 so as to cover an accommodation area in which the electric component is accommodated in the component holder 141 from the axial direction, and on the other end surface, the accommodation area is blocked by a closing section 148 in a state where the electric component is not exposed.SELECTED DRAWING: Figure 15

Description

[Technical Field]

[0001] The disclosure in this specification relates to a wound field type rotating electric machine. [Background technology]

[0002] In a wound-field rotating electric machine, the rotor has a rotor core with multiple main poles (magnetic salient poles) arranged in the circumferential direction, and a field winding wound around the main poles. Also known is a configuration in which a circuit module equipped with electrical components such as diodes and capacitors is provided on one of the axial ends of the rotor (see Patent Document 1). The circuit module has a component holder made of an insulating material such as resin, and the diodes and capacitors are accommodated in accommodation portions provided in the component holder. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2020-124100 Summary of the Invention [Problem to be solved by the invention]

[0004] Heat is generated in the circuit module of the rotor when current is applied. One possible solution to this heat problem is to cool the circuit module using a refrigerant inside the housing of the rotating electrical machine. However, when applying the refrigerant to the component holder of the circuit module, there is a concern that the refrigerant may come into contact with the electrical components, causing inconvenience. In this regard, technical improvements are desired regarding the cooling of the circuit module that is integrally provided on the rotor.

[0005] The present disclosure has been made in consideration of the above circumstances, and aims to provide a wound-field rotating electric machine that can adequately protect electrical components from a refrigerant in a rotor and achieve high cooling performance. [Means for solving the problem]

[0006] The present disclosure provides: a stator having stator windings; a rotor having a rotor core and a field winding wound around the rotor core, the rotor rotating integrally with the rotary shaft; a wound-field rotating electric machine including: a rotor; and a refrigerant is jetted from an axial direction toward an axial end of the rotor; a circuit module having electrical components connected to the field winding in a state fixed to the rotating shaft is provided in the rotor at a position facing an axial end of the field winding, the circuit module has a component holder that accommodates the electrical component; A heat sink is fixed to one of the axial end faces of the component holder so as to axially cover the accommodation area in the component holder in which the electrical components are accommodated, and at the other end face, the accommodation area is sealed off by a closing portion in a state in which the electrical components are not exposed.

[0007] In a wound-field rotating electric machine, the rotor has a circuit module positioned opposite an axial end of the field winding. The circuit module includes a component holder that houses electrical components connected to the field winding and a heat sink fixed to one of the axial end faces of the component holder. A coolant is sprayed axially toward the axial end of the rotor. The heat sink is fixed to the component holder so as to axially cover the housing area in which the electrical components are housed, thereby efficiently dissipating heat from the electrical components. The end face of the component holder opposite the heat sink seals the housing area without exposing the electrical components, thereby preventing the electrical components from being exposed to the coolant. As a result, the rotor can adequately protect the electrical components from the coolant and achieve high cooling performance. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is an overall configuration diagram of a control system for a rotating electrical machine. [Figure 2]FIG. 2 is a diagram showing an inverter and its peripheral configuration. [Figure 3] FIG. [Figure 4] FIG. 3 is a diagram showing an electric circuit provided in the rotor. [Figure 5] FIG. 2 is a perspective view showing the overall configuration of the rotor. [Figure 6] FIG. 4 is a perspective view showing a state in which a covering portion and a coil end cover are removed from the rotor. [Figure 7] FIG. [Figure 8] FIG. [Figure 9] FIG. 3 is an exploded perspective view of a winding unit in the rotor main portion. [Figure 10] FIG. 3 is a cross-sectional view showing a cross-sectional structure of a part of a rotor main portion. [Figure 11] FIG. [Figure 12] FIG. 2 is a diagram showing the internal configuration of the bus bar module. [Figure 13] FIG. [Figure 14] FIG. 3 is a diagram showing the internal configuration of a part holder. [Figure 15] FIG. 2 is a diagram showing a vertical cross-sectional structure of a circuit module. [Figure 16] FIG. 1 is a vertical cross-sectional view schematically showing a rotating electric machine. [Figure 17] FIG. 4 is a perspective view of the coil end cover as seen from outside the cover. [Figure 18] FIG. 4 is a perspective view of the coil end cover as viewed from the inside of the cover. [Figure 19] FIG. 4 is a vertical cross-sectional view showing the cross-sectional structure of a coil end cover. [Figure 20] FIG. 4 is a longitudinal cross-sectional view showing a state in which the coil end cover is attached to the rotor coil end. [Figure 21] FIG. 3 is a plan view of the motor main part as seen from the axial direction. [Figure 22] FIG. [Figure 23] 10 is a diagram showing a protrusion provided in a storage portion of the coil end cover. FIG. [Figure 24]FIG. 4 is a perspective view showing a state in which a stator is assembled to the radially outer side of the rotor. [Figure 25] FIG. 4 is a longitudinal cross-sectional view showing a state in which a stator is assembled to the radially outer side of the rotor. [Figure 26] FIG. 4 is a perspective view of the coil end cover as seen from outside the cover. [Figure 27] FIG. 4 is a perspective view of the coil end cover as viewed from the inside of the cover. [Figure 28] FIG. 4 is a vertical cross-sectional view showing the cross-sectional structure of a coil end cover. [Figure 29] FIG. 4 is a longitudinal cross-sectional view showing a state in which the coil end cover is attached to the rotor coil end. [Figure 30] FIG. 4 is a plan view showing the positional relationship between the outlet of the coil end cover and the groove of the heat sink. [Figure 31] FIG. 4 is a perspective view showing a state in which a stator is assembled to the radially outer side of the rotor. [Figure 32] FIG. 4 is a longitudinal cross-sectional view showing a state in which a stator is assembled to the radially outer side of the rotor. [Figure 33] FIG. 4 is a diagram showing the relationship between the stator current and the field winding temperature. [Figure 34] FIG. 1 is a diagram showing a schematic configuration of a control system including a rotating electric machine and a control device. [Figure 35] FIG. 4 is a diagram showing the relationship between the coolant temperature, the stator temperature, and the field winding temperature. [Figure 36] FIG. 2 is a plan view of an assembly including a stator and a rotor as viewed from the axial direction. [Figure 37] FIG. [Figure 38] FIG. 4 is a diagram showing the flow of refrigerant from the rotor coil end side to the stator coil end side. [Figure 39] FIG. 4 is a longitudinal cross-sectional view showing a state in which the coil end cover is attached to the rotor coil end. [Figure 40] FIG. 4 is a diagram showing the flow of refrigerant from the rotor coil end side to the stator coil end side. [Figure 41] FIG. [Figure 42] FIG. 2 is a plan view of an assembly including a stator and a rotor as viewed from the axial direction. DETAILED DESCRIPTION OF THE INVENTION

[0009] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A wound-field rotating electric machine according to an embodiment of the present disclosure is used as a power source for driving electric vehicles such as electric vehicles and hybrid vehicles.

[0010] First, a control system including a rotating electric machine will be described with reference to Fig. 1. The control system includes a DC power supply 10, an inverter 20, a control device 30, and a rotating electric machine 40. The rotating electric machine 40 is a self-excited wound field type synchronous machine. For example, the rotating electric machine 40, the inverter 20, and the control device 30 may be configured as an electromechanical integrated drive device, or the rotating electric machine 40, the inverter 20, and the control device 30 may each be configured with its own component.

[0011] The rotating electric machine 40 includes a housing 41, and a stator 50 and a rotor 60 housed in the housing 41. The rotating electric machine 40 of this embodiment is an inner rotor type rotating electric machine in which the rotor 60 is disposed radially inside the stator 50.

[0012] The stator 50 includes a stator core 51 and a stator winding 52. The stator winding 52 is made of, for example, copper wire, and includes U-, V-, and W-phase windings 52U, 52V, and 52W that are arranged with an electrical angle offset of 120° from one another.

[0013] The rotor 60 includes a rotor core 61 and a field winding 70. The field winding 70 is preferably made of a conductor material such as aluminum wire, which has a low specific gravity and is easily formed. The conductor material of the field winding 70 is not limited to aluminum wire, and may be copper wire or CNT (carbon nanotube), for example. A rotating shaft 32 is assembled in the center hole of the rotor core 61. The rotating shaft 32 is rotatably supported in the housing 41 by bearings 42 and 43.

[0014] As shown in FIG. 2, the inverter 20 includes a series connection of upper-arm switches SUp, SVp, and SWp for U, V, and W phases and lower-arm switches SUn, SVn, and SWn for U, V, and W phases. First ends of U, V, and W-phase windings 52U, 52V, and 52W are connected to the connection points between the upper-arm switches SUp, SVp, and SWp and the lower-arm switches SUn, SVn, and SWn for each phase. Second ends of the U, V, and W-phase windings 52U, 52V, and 52W are connected at the neutral point. That is, in this embodiment, the stator winding 52 is star-connected. However, the stator winding 52 may also be delta-connected. In this embodiment, each of the switches SUp to SWn is, for example, an IGBT. A freewheel diode is connected in antiparallel to each of the switches SUp to SWn.

[0015] The collectors of the upper arm switches SUp, SVp, SWp of each phase are connected to the positive terminal of a DC power supply 10. The emitters of the lower arm switches SUn, SVn, SWn of each phase are connected to the negative terminal of the DC power supply 10. A smoothing capacitor 11 is connected in parallel to the DC power supply 10.

[0016] Next, the stator 50 and the rotor 60 will be described with reference to FIG.

[0017] The stator 50 and the rotor 60 are both arranged coaxially with the rotating shaft 32. In the following description, the direction in which the rotating shaft 32 extends is referred to as the axial direction, the direction extending radially from the center of the rotating shaft 32 is referred to as the radial direction, and the direction extending circumferentially around the rotating shaft 32 is referred to as the circumferential direction.

[0018] The stator core 51 is made of laminated steel plates made of a soft magnetic material and has an annular back yoke 51a and multiple teeth 51b protruding radially inward from the back yoke 51a. Multiple slots 54 are formed between adjacent teeth 51b in the circumferential direction. The stator winding 52 is formed by accommodating the phase windings of each phase in a predetermined order in each of these slots 54. For example, the stator 50 may employ a segment coil structure using multiple conductor segments. However, the structure of the stator winding 52 is arbitrary.

[0019] The rotor core 61 is made of a soft magnetic material, for example, laminated steel plates. The rotor core 61 has a cylindrical portion 61a and a plurality of main pole portions 62 that protrude radially outward from the cylindrical portion 61a. A field winding 70 is wound around the main pole portions 62 by concentrated winding. In this embodiment, eight main pole portions 62 are provided at equal intervals in the circumferential direction.

[0020] The field winding 70 includes a first winding portion 71 and a second winding portion 72. The first winding portion 71 is wound radially outward around each main pole portion 62, and the second winding portion 72 is wound radially inward relative to the first winding portion 71. In each main pole portion 62, the winding directions of the first winding portion 71 and the second winding portion 72 are the same. Furthermore, of circumferentially adjacent main pole portions 62, the winding directions of the winding portions 71, 72 wound around one are opposite to the winding directions of the winding portions 71, 72 wound around the other. Therefore, the magnetization directions of circumferentially adjacent main pole portions 62 are opposite to each other. In the rotor 60, the main pole portions 62 in the rotor core 61 and the field winding 70 wound around each main pole portion 62 form a plurality of magnetic poles (field poles) arranged in the circumferential direction.

[0021] FIG. 4 is a diagram illustrating an electric circuit including the first and second winding portions 71 and 72 in the rotor 60. The first winding portion 71 and the second winding portion 72 are connected in series by connecting the second end 71b of the first winding portion 71 to the first end 72a of the second winding portion 72. A diode 91 and a capacitor 92 are connected to the second end 71b of the first winding portion 71 in parallel with the second winding portion 72. A diode 93 and a capacitor 94 are connected in series to the series connection of the first winding portion 71 and the second winding portion 72. In the following description, the diode 91 and the capacitor 92 connected in parallel with the second winding portion 72 are also referred to as the parallel diode 91 and the parallel capacitor 92, respectively. The diode 93 and the capacitor 94 connected in series to the series connection of the first winding portion 71 and the second winding portion 72 are also referred to as the series diode 93 and the series capacitor 94, respectively. The capacitors 92 and 94 are, for example, ceramic capacitors or film capacitors.

[0022] The parallel diode 91 has a cathode connected to the first end 72a of the second winding portion 72 and an anode connected to the second end 72b of the second winding portion 72. As a result, in a closed circuit including the second winding portion 72 and the parallel diode 91, current flows in one direction, from the anode side to the cathode side of the parallel diode 91. Furthermore, the series diode 93 has a cathode connected to the first end 71a of the first winding portion 71 and an anode connected to the second end 72b of the second winding portion 72. As a result, the field current flowing through each winding portion 71, 72 is rectified. In this embodiment, the number of turns of the second winding portion 72 is greater than the number of turns of the first winding portion 71.

[0023] Returning to the description of FIG. 2 , the control device 30 is an electronic control unit (EC) primarily composed of a microcomputer 31. The microcomputer 31 includes a central processing unit (CPU). The functions provided by the microcomputer 31 can be provided by software stored in a physical memory device and a computer executing the software, software alone, hardware alone, or a combination thereof. For example, if the microcomputer 31 is provided by hardware electronic circuits, the functions can be provided by digital circuits including multiple logic circuits or analog circuits. For example, the microcomputer 31 executes programs stored in a non-transitory tangible storage medium (NSS) that serves as its own storage unit. The programs include programs for controlling the rotating electric machine 40. A method corresponding to the programs is performed by executing a set of instructions that constitute the programs. The storage unit is, for example, a non-volatile memory. The programs stored in the storage unit can be updated via a communication network such as the Internet, for example, via OTA (Over The Air) or other means.

[0024] Control device 30 generates drive signals that turn on and off each of switches SUp to SWn that constitute inverter 20. Specifically, control device 30 generates drive signals that turn on and off each of switches SUp to SWn and outputs the generated drive signals to the gates of each of switches SUp to SWn in order to convert DC power output from DC power supply 10 into AC power and supply it to U-, V-, and W-phase windings 52U, 52V, and 52W. As a result, in each phase, the upper arm switches and the lower arm switches are alternately turned on with dead times therebetween.

[0025] Control device 30 turns on and off each of switches SUp to SWn so as to pass a composite current of a fundamental current and a high-frequency current (specifically, a high-frequency excitation current) having a frequency higher than that of the fundamental current through each of phase windings 52U, 52V, 52W. The fundamental current is a current that mainly serves to generate torque in rotating electric machine 40. The high-frequency current is a current that mainly serves to excite first and second winding portions 71 and 72 that constitute field winding 70, thereby inducing a field current in field winding 70. The phase currents flowing through phase windings 52U, 52V, 52W are shifted by 120 electrical degrees.

[0026] The high-frequency current flowing through the stator winding 52 may be a harmonic current whose fluctuating frequency is N times (N is an integer greater than or equal to 2) the frequency of the fundamental current, or may be a current whose fluctuating frequency is different from N times the frequency of the fundamental current.

[0027] When a high-frequency current flows through the stator winding 52, a voltage is induced in the first and second winding portions 71 and 72, causing a field current to flow. The induced voltages in the first and second winding portions 71 and 72 are, for example, in phase. The currents IL1 and IL2 flowing through the first and second winding portions 71 and 72 contain frequency components of the high-frequency current.

[0028] 4, when the first and second winding portions 71, 72 are excited by energizing the stator winding 52, a current flows from the first winding portion 71 to the second winding portion 72. Furthermore, when the voltage across the second winding portion 72 exceeds the forward voltage of the parallel diode 91, a current IL2, which is greater than the current IL1 flowing through the first winding portion 71, flows through the closed circuit including the second winding portion 72 and the parallel diode 91. The flow of a current through the closed circuit including the second winding portion 72 and the parallel diode 91 increases the DC component of the field current. This increases the DC component of the magnetic flux of the rotor 60, thereby increasing the torque of the rotating electric machine 40.

[0029] Next, the configuration of the rotor 60 will be described in more detail. Fig. 5 is a perspective view showing the overall configuration of the rotor 60, and Fig. 6 is a perspective view showing the rotor 60 with the outer covering portion 102 that covers the rotor main portion 101 and the coil end covers 103, 104 removed. Fig. 7 is an exploded perspective view of the rotor 60, and Fig. 8 is a vertical cross-sectional view of the rotor 60.

[0030] The rotor 60 is broadly divided into a rotor main section 101, a cylindrical outer covering section 102 provided to surround the outer periphery of the rotor main section 101, coil end covers 103 and 104 attached to one and the other axial ends of the rotor main section 101, and a busbar module 105 and a circuit module 106 provided at one end of both axial sides of the rotor main section 101. The rotor main section 101 includes a rotor core 61 and a field winding 70, and the rotating shaft 32 is attached to the center hole of the rotor core 61. The field winding 70 is made up of a plurality of winding units 110 arranged in the circumferential direction.

[0031] The busbar module 105 and the circuit module 106 are fixed to the rotating shaft 32 with the rotating shaft 32 inserted through each hollow portion. As a result, the busbar module 105 and the circuit module 106 are provided at positions axially facing the coil end portions of the field winding 70. The outer circumferential covering portion 102 is formed by using, for example, a string-like yarn and winding the yarn in multiple layers around the outer circumferential sides of the plurality of winding units 110 assembled to the rotor core 61.

[0032] FIG. 9 is an exploded perspective view of the winding unit 110 in the rotor main section 101, and FIG. 10 is a cross-sectional view showing the cross-sectional structure of a part of the rotor main section 101.

[0033] The rotor main section 101 has a plurality of winding units 110, one for each magnetic pole of the rotor 60. Each winding unit 110 is formed in an annular shape with the axial direction as the longitudinal direction, and is assembled to the rotor core 61 with the main pole section 62 of the rotor core 61 inserted into its hollow section. In this embodiment, the winding units 110 form a "pole coil."

[0034] The winding unit 110 has a first coil module 111 that is on the radially outer side when attached to the main pole section 62, and a second coil module 112 that is on the radially inner side. The first coil module 111 is a coil module that corresponds to the first winding section 71, and the second coil module 112 is a coil module that corresponds to the second winding section 72.

[0035] The first coil module 111 has an annular coil body 121 formed by winding a conductor material made of a rectangular wire multiple times in the circumferential and radial directions, and a thin plate-like insulator 122 provided integrally with the coil body 121. The insulator 122 has a portion that extends circumferentially and covers the outer peripheral portions on the radially outer and inner sides of the coil body 121, and a portion that extends radially and covers the hollow portion of the coil body 121. In other words, the outer peripheral portion on the radially outer side, the inner peripheral portion on the radially inner side, and the hollow portion of the coil body 121 are insulated and coated with the insulator 122.

[0036] The second coil module 112 has an annular coil body 123 formed by winding a conductor material made of a rectangular wire multiple times in the circumferential and radial directions, and a thin plate-like insulator 124 provided integrally with the coil body 123. The insulator 124 has a portion that extends circumferentially and covers the outer peripheral portions on the radially outer and inner sides of the coil body 123, and a portion that extends radially and covers the hollow portion of the coil body 123. In other words, the outer peripheral portion on the radially outer side and the inner peripheral portion and hollow portion of the coil body 123 are insulated and coated with the insulator 124.

[0037] The coil body 121 of the first coil module 111 is, for example, an α-winding coil in which a conductive wire is wound in an α-winding manner. The coil body 123 of the second coil module 112 is a continuously wound coil in which a conductive wire is continuously wound in a predetermined circumferential direction. In the first coil module 111, two conductive wire ends 125 are drawn out in the axial direction, and in the second coil module 112, two conductive wire ends 126 are drawn out in the axial direction. In each of the winding units 110 arranged in the circumferential direction, the conductive wire ends 125, 126 are connected to each other, so that the multiple first coil modules 111 provided on each main pole part 62 are connected in series, and the multiple second coil modules 112 provided on each main pole part 62 are connected in series. In each of the coil modules 111, 112, the portion where the conductor is wound around the main pole portion 62 is the "winding portion," and the end of the conductor extending from the winding portion is the "conductor end portion 125, 126."

[0038] The conductor wire used for the coil bodies 121, 123 is, for example, a flat wire having a substantially rectangular cross section (specifically, a substantially rectangular shape). The flat wire is composed of a conductor portion made of aluminum or the like and an insulating layer covering the conductor portion. However, a round wire having a circular cross section can also be used as the conductor wire. Note that the coil structure of each coil module 111, 112 is optional; for example, the coil bodies 121, 123 can both be continuous wound coils.

[0039] As shown in Fig. 10, the first coil module 111 has two radially wound layers of conductive wire, while the second coil module 112 has twelve radially wound layers of conductive wire. The number of layers in each of the coil modules 111, 112 is arbitrary, but it is preferable that the number of layers in the second coil module 112 is greater than the number of layers in the first coil module 111. The coil modules 111, 112 have different numbers of circumferential windings (in other words, the number of rows of conductive wire in the circumferential direction), with the number of windings being greater on the radially outer side than on the radially inner side. This improves the space factor of the field winding 70.

[0040] Next, the bus bar module 105 and the circuit module 106 will be described. Fig. 11 is a perspective view of the bus bar module 105, and Fig. 12 is a diagram showing the internal configuration of the bus bar module 105. Fig. 13 is a perspective view showing the circuit module 106 exploded into a component holder 141 and a heat sink 151, and Fig. 14 is a diagram showing the internal configuration of the component holder 141.

[0041] 11 and 12, busbar module 105 has main body 131 made of a resin molded body, and has a center hole 132 at the center thereof. A highly rigid cylindrical member 133 made of, for example, metal is assembled in center hole 132. Busbar module 105 is assembled to rotating shaft 32 with rotating shaft 32 inserted into the inner periphery of cylindrical member 133.

[0042] A plurality of bus bars 134 for electrically connecting the coil modules 111, 112 for each magnetic pole are embedded in the main body 131. In the main body 131, each bus bar 134 is arranged to extend circumferentially around the central hole 132, and both longitudinal ends of each bus bar 134 form arm portions 134a that extend radially. The arm portions 134a protrude radially outward from the outer circumferential surface of the main body 131, and their tip portions are bent in the axial direction.

[0043] The bus bar 134 of the bus bar module 105 has: Seven bus bars 134 that connect the first coil modules 111 for eight magnetic poles in series; Seven bus bars 134 that connect the second coil modules 112 for eight magnetic poles in series; The arm portions 134a of each bus bar 134 are connected to the conductor ends of the coil modules 111, 112, one by one. The bus bars 134 also include bus bars 134 that form both ends of a series-connected body of first coil modules 111 with eight magnetic poles, and bus bars 134 that form both ends of a series-connected body of second coil modules 112 with eight magnetic poles.

[0044] 13 and 14, the circuit module 106 has a component holder 141 that houses electrical components, and a heat sink 151 that is placed on the component holder 141. The component holder 141 and the heat sink 151 are both disk-shaped and have the same outer diameter. The component holder 141 and the heat sink 151 are integrated with their axial end faces joined together (see FIG. 7).

[0045] Component holder 141 is made of a resin molded body and has a center hole 142 at its center. A highly rigid cylindrical member 143 made of, for example, metal is attached to center hole 142. Component holder 141 is attached to rotating shaft 32 with rotating shaft 32 inserted into the inner periphery of cylindrical member 143.

[0046] Component holder 141 has electrical components that configure the electrical circuit described in Fig. 4, and also has a plurality of bus bars 145 electrically connected to each of these electrical components. These electrical components and bus bars 145 are provided in component holder 141 in a state where they are embedded in resin.

[0047] The component holder 141 holds the diodes 91 and 93 and the capacitors 92 and 94 as electrical components around the central hole 142. A bus bar 145 is connected to each of these electrical components. In this embodiment, three bus bars 145_1, 145_2, and 145_3 are used as the bus bar 145. In the component holder 141, the periphery of each electrical component may be sealed with a sealing material.

[0048] The bus bar 145_1 is connected to the diode 93 and the capacitor 94, and in terms of the electrical circuit of Fig. 4, is a bus bar connected to the first end 71a of the first winding portion 71. The bus bar 145_2 is connected to the diode 91 and the capacitor 92, and in terms of the electrical circuit of Fig. 4, is a bus bar connected to the second end 71b of the first winding portion 71 and the first end 72a of the second winding portion 72. The bus bar 145_3 is connected to the diodes 91, 93 and the capacitors 92, 94, and in terms of the electrical circuit of Fig. 4, is a bus bar connected to the second end 72b of the second winding portion 72.

[0049] In the component holder 141, each bus bar 145 is arranged to extend circumferentially around the central hole 142, and each has an arm portion 145a extending radially. The arm portion 145a extends radially, with its tip portion bent axially. The tip portion of the arm portion 145a is exposed to the outside of the holder and serves as a connection end portion where connection to the first winding portion 71 and the second winding portion 72 is made.

[0050] As shown in FIG. 13 , heat sink 151 is fixed to one of the axially opposite sides of component holder 141 on the side opposite rotor core 61 (the right side in the figure). By fixing heat sink 151 to component holder 141, the entire end face of component holder 141 on the side opposite the rotor core is covered by heat sink 151. Heat sink 151 is made of aluminum, for example. However, heat sink 151 may be made of other materials with excellent heat dissipation properties, such as aluminum alloy or copper. A central hole 152 is provided in the center of heat sink 151. A cylindrical member 143 integrated with component holder 141 is assembled into central hole 152.

[0051] By fixing the heat sink 151 to the axial end face of the component holder 141, heat generated in the diodes 91 and 93 and the capacitors 92 and 94 when current is applied to the component holder 141 is released via the heat sink 151.

[0052] Component holder 141 is provided with a plurality of through holes 146 that penetrate in the plate thickness direction. Heat sink 151 is provided with a plurality of through holes 153 that penetrate in the plate thickness direction. These through holes 146, 153 are provided at positions that communicate with each other in the axial direction.

[0053] The vertical cross-sectional structure of circuit module 106 will be described with reference to Fig. 15. Fig. 15 is a cross-sectional view taken at a position corresponding to line 15-15 in Fig. 14 and crossing capacitor 92 in the radial direction.

[0054] 15 , the component holder 141 is provided with an accommodation section 147 that accommodates the capacitor 92. The accommodation section 147 is formed to extend in the axial direction (the vertical direction in the figure). A heat sink 151 is fixed to one of the axial end faces of the component holder 141 so as to cover the accommodation section 147 (i.e., the component accommodation area) of the component holder 141 from the axial direction. At the other end face of the component holder 141, the accommodation section 147 is closed by a closing section 148 so that the capacitor 92 is not exposed. The closing section 148 is a separate member from the component holder 141 and is formed, for example, by filling the accommodation section 147 with a resin material when the capacitor 92 is accommodated therein. The accommodation section 147 is formed to penetrate the component holder 141 in the axial direction, with an opening on one axial side closed by the heat sink 151 and an opening on the other axial side closed by the closing section 148.

[0055] Closing portion 148 may be a spacer that closes the opening of accommodating portion 147 on the side opposite to the heat sink and fills the gap inside accommodating portion 147. Closing portion 148 may also be a part of component holder 141.

[0056] 14 and other figures, component holder 141 has a plurality of electrical components (diodes 91, 93, capacitors 92, 94) arranged around central hole 142 (rotation shaft 32), and each electrical component is provided with a plurality of accommodation sections 147. That is, component holder 141 accommodates an electrical component in each accommodation section 147, so that the electrical components are arranged in a circumferential direction around rotation shaft 32. However, accommodation section 147 may be formed to have a size that allows two or more electrical components to be accommodated together.

[0057] The electrical components housed in housing portion 147 are preferably in contact with heat sink 151. However, it is not essential that the electrical components be in contact with heat sink 151, and a space or a spacer portion may be interposed between the electrical components and heat sink 151.

[0058] Groove portions 155 are provided in the radial direction on the end surface of heat sink 151 opposite component holder 141. Groove portions 155 are provided in the heat sink 151 in a range from center hole 152 to the outer periphery. Heat dissipation fins 156 are provided in groove portions 155. Groove portions 155 are provided in two locations in the circumferential direction. Groove portions 155 may be provided in accordance with the positions of the electrical components mounted on component holder 141, and in this embodiment, groove portions 155 are provided in two locations that overlap diodes 91 and 93 of the electrical components.

[0059] The rotating electrical machine 40 of this embodiment is configured so that the field winding 70 is cooled by a refrigerant inside the housing 41, and the configuration relating to the cooling of the field winding 70 will be described below.

[0060] Fig. 16 is a vertical cross-sectional view that schematically shows the rotating electric machine 40. In Fig. 16, as described above, the stator 50 is provided radially outside the rotor 60, and the rotor 60 and stator 50 are housed in the housing 41. The rotor 60 is rotatably supported by bearings 42 and 43. Here, one end (right side in the figure) of both axial sides of the rotating electric machine 40 is designated as a first end X1, and the other end (left side in the figure) is designated as a second end X2.

[0061] In the field winding 70, the portion that is axially outward from the rotor core 61 is a rotor coil end. In the following description, of the rotor coil ends on both axial sides, the rotor coil end on the first end X1 side will be referred to as the "rotor coil end RE1," and the rotor coil end on the second end X2 side will be referred to as the "rotor coil end RE2." In addition, in the stator winding 52, the portion that is axially outward from the stator core 51 is a stator coil end. The stator coil ends are arranged radially outward from the rotor coil ends. In the following description, of the stator coil ends on both axial sides, the stator coil end on the first end X1 side will be referred to as the "stator coil end SE1," and the stator coil end on the second end X2 side will be referred to as the "stator coil end SE2."

[0062] In the rotor 60 and the stator 50, the rotor core 61 and the stator core 51 have the same axial length, and the coil side portions of the field winding 70 and the stator winding 52 that overlap with each core 61, 51 in the radial direction are in the same range in the axial direction.

[0063] The rotating electric machine 40 is configured so that a refrigerant is supplied to each of the rotor coil ends RE1, RE2 of the field winding 70, thereby cooling the field winding 70. The refrigerant is a cooling liquid such as cooling water or cooling oil, for example.

[0064] Specifically, in the rotating electrical machine 40, spray passages 161, 162 that spray refrigerant are provided within the housing 41 at both axial ends of the rotor 60 (i.e., the first end X1 side and the second end X2 side). The spray passages 161, 162 are refrigerant spray units that take in refrigerant from outside the rotating electrical machine 40 and spray the refrigerant axially toward the coil end covers 103, 104 on both axial sides. The spray passages 161, 162 may be formed by piping or the like attached within the housing 41, or may be formed by holes provided in a peripheral wall or end plate of the housing 41. The housing 41 also has outlets 163, 164 at both axial ends of the rotor 60 as refrigerant discharge units that discharge the refrigerant.

[0065] The refrigerant supply system that supplies refrigerant to the rotating electrical machine 40 has a circulation passage 171 that circulates the refrigerant, and also has a circulation pump 172 and a heat dissipation unit 173 that are provided in the circulation passage 171. The circulation pump 172 is, for example, an electric pump. The heat dissipation unit 173 is, for example, a radiator that dissipates heat of the refrigerant into the atmosphere. The refrigerant flows through the circulation passage 171 when the circulation pump 172 is driven.

[0066] When the rotating electric machine 40 is driven to rotate, the refrigerant flowing in from the circulation passage 171 is sprayed from the spray passages 161, 162 onto each of the coil end covers 103, 104 on both axial sides. Each of the coil end covers 103, 104 is provided with a refrigerant flow path that allows the refrigerant to flow in the axial direction, and the refrigerant sprayed onto the outside of each of the coil end covers 103, 104 (outside of the cover) flows into the inside of the cover. This supplies the refrigerant to each of the rotor coil ends RE1, RE2 of the field winding 70, cooling the field winding 70. The refrigerant that flows into the inside of the cover is scattered radially outward due to the centrifugal force of the rotation of the rotor 60. The refrigerant is then discharged from the outer periphery of each of the coil end covers 103, 104 to the outside of the cover, and is used to cool the stator coil ends SE1, SE2.

[0067] The refrigerant supply system may be configured to have two separate refrigerant supply systems at both axial ends (i.e., the first end X1 side and the second end X2 side) of the rotor 60. In this case, it is preferable that the refrigerant is supplied to the first end X1 side and the second end X2 side of the rotating electrical machine 40 via separate circulation passages 171.

[0068] Next, the refrigerant flow structure in the coil end covers 103, 104 will be described. Of the coil end covers 103, 104 on both axial sides, the coil end cover 103 is provided on the first end X1 side to cover the rotor coil end RE1 of the field winding 70 with the bus bar module 105 and the circuit module 106 housed inside the cover. The coil end cover 104 is provided on the second end X2 side to cover the rotor coil end RE2 of the field winding 70. The coil end covers 103, 104 may be made of a non-magnetic material, such as aluminum. The coil end covers 103, 104 may also be made of synthetic resin. Here, the configuration of the coil end cover 104 on the second end X2 side will first be described.

[0069] Fig. 17 is a perspective view of the coil end cover 104 as seen from the outside of the cover, and Fig. 18 is a perspective view of the coil end cover 104 as seen from the inside of the cover. Fig. 19 is a vertical cross-sectional view showing the cross-sectional structure of the coil end cover 104. Fig. 20 is a vertical cross-sectional view showing the coil end cover 104 attached to the rotor coil end RE2 side of the field winding 70.

[0070] The coil end cover 104 has an end plate portion 181 that is fixed to the rotating shaft 32, and an annular portion 182 that extends axially from the outer periphery of the end plate portion 181 and surrounds the rotor coil end RE2 from the radially outer side. The end plate portion 181 extends radially while fixed to the rotating shaft 32, and has a center hole 183 that penetrates in the plate thickness direction at its radial center. The coil end cover 104 is fixed to the rotating shaft 32 by press-fitting the end plate portion 181, fastening with screws, or the like, with the rotating shaft 32 inserted through the center hole 183 of the end plate portion 181. The annular portion 182 is attached to the axial end of the winding unit 110 (more specifically, the axial end of the insulator 122 of the first coil module 111).

[0071] A refrigerant flow path for passing a refrigerant is formed between both axial surfaces of end plate portion 181. Specifically, end plate portion 181 has an inlet 191 that opens on one of both axial surfaces of end plate portion 181 opposite the rotor core (upper side in FIG. 19) and allows the refrigerant sprayed from spray passage 162 to flow in, an outlet 192 that opens on one of both axial surfaces of end plate portion 181 on the rotor core side (lower side in FIG. 19) and allows the refrigerant that has flowed in from inlet 191 to flow out, and a storage portion 193 that is provided between inlet 191 and outlet 192 and temporarily stores the refrigerant. In end plate portion 181, inlet 191, storage portion 193, and outlet 192 form a refrigerant flow path.

[0072] Inlet 191 surrounds central hole 183 and is formed in a circumferentially continuous annular shape. Reservoir 193 is formed downstream of inlet 191 so as to radially expand inlet 191. Similar to inlet 191, reservoir 193 surrounds central hole 183 and is formed in a circumferentially continuous annular shape. Reservoir 193 is a portion that temporarily stores the refrigerant that flows in from inlet 191, and is, so to speak, an oil reservoir.

[0073] The end plate portion 181 is provided with a plurality of outlets 192 at predetermined intervals in the circumferential direction, at positions aligned in the axial direction with the storage portion 193. In this embodiment, an outlet 192 is provided for each magnetic pole, and specifically, eight outlets 192 are provided in the circumferential direction. In this case, in terms of the relationship with the winding unit 110 (pole coil) of each magnetic pole, as shown in FIG. 21 , the outlets 192 are provided at positions axially opposing the coil ends of the winding unit 110 of each magnetic pole. It is also possible to provide a plurality of outlets 192 for each magnetic pole in the end plate portion 181.

[0074] In the end plate portion 181, the opening area (inflow area) of the inlet 191 is larger than the opening area (outflow area) of the outlet 192. Specifically, as shown in Fig. 20(a), in the end plate portion 181, the radial opening dimension D1 of the inlet 191 is larger than the radial opening dimension D2 of the outlet 192 (D1>D2). This makes it easier for the refrigerant to be introduced from the inlet 191 into the storage portion 193. Furthermore, according to the continuity theorem, the speed of the refrigerant flowing out from the outlet 192 is increased.

[0075] The end plate portion 181 has a convex portion 194 on the radial center side that convex toward the inside of the cover. The convex portion 194 is provided in an axially convex shape around the rotating shaft 32. Here, as shown in FIG. 20(b), an inner space S is formed radially inward of the position where the coil end height is highest in the rotor coil end RE2 of the field winding 70, and the coil end cover 104 is attached so that the convex portion 194 is within the inner space S. In this case, the outlet 192 is provided in the convex portion 194 at a position radially facing the rotor coil end RE2.

[0076] Furthermore, the field winding 70 has a larger number of turns of the conductor wire on the radially outer side than on the radially inner side, and the coil ends of the field winding 70 are higher from the rotor core 61 on the radially outer side than on the radially inner side. In a plan view of the coil ends of the field winding 70 as seen from the axial direction ( FIG. 21 ), the outlets 192 are provided at positions that overlap radially inward of the radial center positions of each winding unit 110. In other words, the outlets 192 are provided so as to overlap a portion that is radially inward of the radial center position between the radially innermost and radially outermost sides of the coil ends of the field winding 70.

[0077] The coil end cover 104 may be formed by joining two separately molded components. For example, the coil end cover 104 may be formed of an inner annular component and an outer annular component, with a parting line defined by a circle passing through the circumferentially arranged outlet ports 192. In this case, the two components may be joined by welding or the like. This makes it easier to manufacture the coil end cover 104 than if it were molded as a single piece.

[0078] As shown in FIG. 20(b), the refrigerant is injected into the coil end cover 104 from the axial direction (upward in the figure) and flows along path R1. That is, when the rotor is rotating, the refrigerant flows from inlet 191 into reservoir 193, is temporarily stored in reservoir 193, and then flows out from outlet 192. At this time, the refrigerant flowing out from outlet 192 is sprayed onto a lower portion of rotor coil end RE2, and then flows sequentially from the lower coil end height to the higher coil end height in rotor coil end RE2 due to the centrifugal force of rotation. This allows the refrigerant to be distributed over a wide area in rotor coil end RE2, efficiently cooling rotor coil end RE2. The angle θ between the extension direction of outlet 192 and the axial direction (the axis of rotation shaft 32) should be within the range of 0 to 90°.

[0079] 17 and 18, discharge holes 195 are formed at predetermined intervals in the circumferential direction in the annular portion 182 of the coil end cover 104. The discharge holes 195 are provided in pairs at eight locations in the circumferential direction, which is the same number as the number of poles. The discharge holes 195 are also provided at positions in the annular portion 182 that are at the midpoint of the stator coil ends, and the coolant introduced into the coil end cover 104 is discharged radially outward from the coil end cover 104 through the discharge holes 195.

[0080] Fig. 22 is a plan view of the coil end cover 104. In Fig. 22, the storage portion 193 and the outlet port 192 are indicated by hidden lines (broken lines).

[0081] The annular portion 182 of the coil end cover 104 has multiple flat portions 184 spaced at predetermined intervals in the circumferential direction, with apexes 185 between the flat portions 184. The apexes 185 are located between two circumferentially adjacent flat portions 184 that intersect at a predetermined angle. In other words, the coil end cover 104 has a generally polygonal shape in plan view. In this embodiment, the coil end cover 104 has a generally octagonal shape in plan view, with two circumferentially adjacent flat portions 184 intersecting at an angle of 135°, forming the apexes 185 between them. Each apex 185 is provided with a pair of discharge holes 195. The internal configuration of the annular portion 182 is shown in FIG. 18 . In this case, the refrigerant inside the cover is blown toward the annular portion 182 by rotational centrifugal force and temporarily remains near the apexes 185. Then, the refrigerant near the top 185 of the annular portion 182 is discharged radially outward from the discharge holes 195 by the rotational centrifugal force.

[0082] The coil end cover 104 is provided with eight outlets 192 in the circumferential direction, and also with eight pairs of discharge holes 195 in the circumferential direction. However, these outlets 192 and discharge holes 195 are provided at mutually different positions in the circumferential direction. In this case, as shown in FIG. 21 , the outlets 192 that discharge the coolant to the rotor coil end RE2 are provided at positions axially facing the coil ends of the winding units 110 of each magnetic pole. In contrast, the discharge holes 195 that discharge the coolant from the rotor coil end RE2 side are provided at positions circumferentially between the winding units 110 of each magnetic pole. The configuration of these outlets 192 and discharge holes 195 allows the rotor coil end RE2 of the field winding 70 to be widely cooled by the refrigerant.

[0083] 23, it is preferable that a plurality of protrusions 193b protruding radially inward be provided on an outer wall portion 193a that is radially outward of the storage portion 193. It is preferable that the protrusions 193b be provided, for example, at positions between the outlets 192 that are lined up in the circumferential direction. However, the protrusions 193b may also be provided at positions that overlap with the outlets 192 in the radial direction. When the coil end cover 104 is in a rotating state, the protrusions 193b encourage the refrigerant to flow from the storage portion 193 to the outlets 192.

[0084] The outer wall portion 193a of the coil end cover 104 may be provided with wall portions extending radially inward between the respective outlet ports 192 aligned in the circumferential direction, as protrusions 193b.

[0085] Figure 24 is an oblique view showing the configuration of the second end X2 side when the stator 50 is assembled radially outside the rotor 60, and Figure 25 is a longitudinal cross-sectional view showing the state when the stator 50 is assembled radially outside the rotor 60.

[0086] Stator coil end SE2 of stator winding 52 is located radially outward of rotor coil end RE2. The refrigerant that flows into coil end cover 104 is used to cool rotor coil end RE2, and then is ejected radially outward from discharge holes 195 due to rotational centrifugal force. The refrigerant ejected from discharge holes 195 then cools stator coil end SE2. At this time, inside the cover, the refrigerant flows through the axial end faces of rotor coil ends RE2 and between each rotor coil end RE2 in the circumferential direction, reaches annular portion 182, and is then ejected from discharge holes 195.

[0087] Next, the configuration of the coil end cover 103 on the first end X1 side will be described.

[0088] Fig. 26 is a perspective view of the coil end cover 103 as seen from the outside of the cover, and Fig. 27 is a perspective view of the coil end cover 103 as seen from the inside of the cover. Fig. 27 shows the coil end cover 103 together with the circuit module 106 in a separated state. Fig. 28 is a vertical cross-sectional view showing the cross-sectional structure of the coil end cover 103. Fig. 29 is a vertical cross-sectional view showing the coil end cover 103 attached to the rotor coil end RE1 side of the field winding 70.

[0089] The coil end cover 103 has an end plate portion 201 that is fixed to the rotating shaft 32, and an annular portion 202 that extends axially from the outer periphery of the end plate portion 201 and surrounds the rotor coil end RE1 from the radially outer side. The end plate portion 201 extends radially while fixed to the rotating shaft 32, and has a center hole 203 that penetrates in the plate thickness direction at its radial center. The coil end cover 103 is fixed to the rotating shaft 32 by press-fitting the end plate portion 201, fastening with screws, or the like, with the rotating shaft 32 inserted through the center hole 203 in the end plate portion 201.

[0090] The annular portion 202 is formed in two stages in the axial direction, and has a small diameter portion 204 with a relatively small outer diameter and a large diameter portion 205 with a relatively large outer diameter. The inside of the small diameter portion 204 serves as a module accommodating portion that accommodates the circuit module 106, and the inside of the large diameter portion 205 serves as a coil end accommodating portion that accommodates the rotor coil end RE1. The large diameter portion 205 is assembled to the axial end of the winding unit 110 (more specifically, the axial end of the insulator 122 of the first coil module 111).

[0091] A refrigerant flow path for passing a refrigerant is formed between both axial surfaces of the end plate portion 201. Specifically, the end plate portion 201 has an inlet 211 that opens on one of the axial surfaces of the end plate portion 201 opposite the rotor core (the upper side in FIG. 28) and allows the refrigerant sprayed from the spray passage 161 to flow in, an outlet 212 that opens on one of the axial surfaces of the end plate portion 201 on the rotor core side (the lower side in FIG. 28) and allows the refrigerant that has flowed in from the inlet 211 to flow out, and a storage portion 213 that is provided between the inlet 211 and the outlet 212 and temporarily stores the refrigerant. In the end plate portion 201, the inlet 211, the storage portion 213, and the outlet 212 form a refrigerant flow path.

[0092] Inlet 211 surrounds central hole 203 and is formed in a circumferentially continuous annular shape. Reservoir 213 is formed downstream of inlet 211 so as to radially expand inlet 211. Similar to inlet 211, reservoir 213 surrounds central hole 203 and is formed in a circumferentially continuous annular shape. Reservoir 213 is a portion that temporarily stores the refrigerant that flows in from inlet 211, and is, so to speak, an oil reservoir.

[0093] The end plate portion 201 is provided with a plurality of outlets 212 at predetermined intervals in the circumferential direction, at positions aligned axially with the storage portion 213. As shown in Fig. 27, the outlets 212 are aligned circumferentially on the same circle concentric with the circuit module 106, and are provided at positions spaced apart from each other. The circuit module 106 is disposed on the rotor core side of the end plate portion 201, housed in the small diameter portion 204. In this case, the heat sink 151 faces the end plate portion 201 in the axial direction.

[0094] 29, the outlet 212 of the end plate portion 201 and the through holes 146, 153 provided in the component holder 141 and the heat sink 151 of the circuit module 106, respectively, are in axial communication with each other. This allows the refrigerant flowing out from the outlet 212 of the end plate portion 201 to be supplied to the rotor coil end RE1 side of the field winding 70 through the through holes 146, 153.

[0095] In end plate portion 201, the opening area (inflow area) of inlet 211 is larger than the opening area (outflow area) of outlet 212. This makes it easier for the refrigerant to be introduced from inlet 211 into storage portion 213. In addition, according to the continuity theorem, the speed of the refrigerant flowing out from outlet 212 is increased.

[0096] In addition, the outer wall portion of the storage portion 213 of the coil end cover 103 that is on the radially outer side may be provided with multiple protrusions that protrude radially inward, similar to the storage portion 193 of the coil end cover 104 (see Figure 23).

[0097] In the coil end cover 103 on the first end X1 side, similar to the coil end cover 104 on the second end X2 side, an outlet 212 may be provided in the end plate portion 201 for each winding unit 110 (pole coil) of each magnetic pole.

[0098] As shown in FIG. 29, in circuit module 106, component holder 141 and heat sink 151 are provided with through holes 146, 153 at positions overlapping radially inward from the radial center position of each winding unit 110.

[0099] The refrigerant is sprayed onto the coil end cover 103 from the axial direction (upward in the figure) and flows along path R2. That is, when the rotor is rotating, the refrigerant flows from the inlet 211 of the coil end cover 103 into the reservoir 213, is temporarily stored in the reservoir 213, and then flows out from the outlet 212 into the cover interior. Furthermore, after passing through the through holes 146, 153 of the part holder 141 and the heat sink 151, the refrigerant is sprayed onto the lower portion of the rotor coil end RE1 and then flows sequentially from the lower coil end height to the higher coil end height in the rotor coil end RE1 due to the centrifugal force of rotation. This causes the refrigerant to spread over a wide area in the rotor coil end RE1, efficiently cooling the rotor coil end RE1.

[0100] 27 , bus bar 145 provided on component holder 141 is provided at a position across through holes 146 and 153 extending circumferentially in component holder 141 and heat sink 151. This allows bus bar 145 to be cooled by the refrigerant passing through through holes 146 and 153.

[0101] Furthermore, in this embodiment, the refrigerant that flows out of the outlet 212 of the end plate portion 201 into the coil end cover 103 is supplied to the rotor coil end RE1 via the part holder 141 and the through holes 146, 153 of the heat sink 151, and also flows radially along the end face of the heat sink 151. This configuration will now be described.

[0102] Fig. 30 is a plan view showing the positional relationship between the outlet 212 provided in the end plate portion 201 of the coil end cover 103 and the groove portion 155 of the heat sink 151. In Fig. 30, the coil end cover 103 is shown by an imaginary line.

[0103] 30, some of the outlets 212 provided in the end plate portion 201 of the coil end cover 103 are provided at positions that overlap with the groove portions 155 of the heat dissipation plate 151. Here, for ease of explanation, of the outlets 212 provided in the end plate portion 201, the outlets 212 that do not overlap with the groove portions 155 of the heat dissipation plate 151 are referred to as "outlet 212A," and the outlets 212 that overlap with the groove portions 155 of the heat dissipation plate 151 are referred to as "outlet 212B."

[0104] In this case, the refrigerant flowing out from outlet 212A of end plate portion 201 is supplied to rotor coil end RE1 via through holes 146, 153 of component holder 141 and heat sink 151, as described above. In contrast, the refrigerant flowing out from outlet 212B of end plate portion 201 reaches groove 155 of heat sink 151 and then flows radially along groove 155. At this time, heat sink 151 is cooled by the refrigerant.

[0105] 29, the refrigerant flow path provided in the end plate portion 201 of the coil end cover 103 is configured to communicate with a first flow path Y1 that supplies the refrigerant to the rotor coil end RE1 side via the through holes 146, 153 of the part holder 141 and the heat sink 151, and a second flow path Y2 that circulates the refrigerant along the axial end face of the heat sink 151. A discharge hole 214 is provided in the small diameter portion 204 of the coil end cover 103 at a position corresponding to the groove portion 155, and the refrigerant flowing through the groove portion 155 is discharged from the discharge hole 214 to the outside of the cover.

[0106] 26 and 27, discharge holes 215 are formed at predetermined intervals in the circumferential direction in the large diameter portion 205 of the annular portion 202 of the coil end cover 103. The discharge holes 215 are provided at eight locations in the circumferential direction, the same number as the number of poles. The discharge holes 215 are also provided at positions in the annular portion 202 that are at the midpoint of the stator coil ends, and the coolant introduced into the coil end cover 103 is discharged radially outward from the coil end cover 103 through the discharge holes 215.

[0107] In addition, in the coil end cover 103, similar to the coil end cover 104, the annular portion 202 may have a shape with multiple apexes in the circumferential direction, and a discharge hole 215 may be provided near each of the apexes (see Figures 17 and 18).

[0108] Figure 31 is an oblique view showing the configuration of the first end X1 side when the stator 50 is assembled radially outside the rotor 60, and Figure 32 is a longitudinal cross-sectional view showing the state when the stator 50 is assembled radially outside the rotor 60.

[0109] Stator coil end SE1 of stator winding 52 is located radially outward of rotor coil end RE1. The refrigerant that flows into coil end cover 103 and passes through through holes 146, 153 of component holder 141 and heat sink 151 is used to cool rotor coil end RE1, and then is ejected radially outward from discharge holes 215 due to rotational centrifugal force. The refrigerant ejected from discharge holes 215 then cools stator coil end SE1. At this time, inside the cover, the refrigerant flows through the axial end faces of rotor coil end RE1 and between each rotor coil end RE1 in the circumferential direction, reaches annular portion 202, and is then ejected from discharge holes 215.

[0110] Incidentally, in the rotating electric machine 40, when the field winding 70 of the rotor 60 is cooled by the refrigerant, the temperature of the refrigerant rises due to heat generated in the field winding 70. For this reason, a refrigerant temperature sensor 221 is provided in the rotating electric machine 40, and the temperature of the field winding 70 can be estimated by determining the amount of rise in the temperature of the refrigerant from the detection value of the refrigerant temperature sensor 221. However, the rotating electric machine 40 has the stator winding 52 in addition to the field winding 70 as a heat source, and if the refrigerant temperature rises due to the heat of the stator winding 52, the accuracy of estimating the temperature of the field winding 70 will decrease.

[0111] Therefore, in this embodiment, the refrigerant temperature sensor 221 for detecting the refrigerant temperature is configured to be located downstream of the field winding 70 in the path through which the refrigerant flows within the housing 41, in a state where heat reception from the stator winding 52 is restricted.

[0112] Furthermore, in this embodiment, a field current flows through the field winding 70 due to excitation caused by energization of the stator winding 52. More specifically, a harmonic current flows through the stator winding 52, and the harmonic current excites the field winding 70, causing a field current to flow through the field winding 70. Therefore, the temperature of the field winding 70 changes depending on the magnitude of the current flowing through the stator winding 52. That is, when the stator winding 52 is energized, the temperature of the stator winding 52 rises due to the energization, and the temperature of the field winding 70 rises due to the energization of the field winding 70 caused by the energization of the stator winding 52. FIG. 33 is a diagram showing the relationship between the stator current flowing through the stator winding 52 and the temperature of the field winding 70; the larger the stator current, the higher the temperature of the field winding 70.

[0113] Therefore, in this embodiment, in a control system including the rotating electric machine 40 and the control device 30, the temperature of the field winding 70 is estimated based on the detection value of the refrigerant temperature sensor 221 that detects the refrigerant temperature and the detection value of the stator temperature sensor 222 that detects the temperature of the stator winding 52. The refrigerant temperature sensor 221 corresponds to the "first temperature sensor," and the stator temperature sensor 222 corresponds to the "second temperature sensor." The control device 30 corresponds to the "estimation unit."

[0114] Incidentally, the wound field rotor 60 generates heat when current is passed through it, and therefore has a higher temperature than a permanent magnet rotor. In this case, in order to operate the rotating electric machine 40 efficiently and to protect the field winding 70, it is desirable to accurately estimate the temperature of the field winding 70.

[0115] 34 shows a schematic configuration of a control system including a rotating electrical machine 40 and a control device 30. In FIG. 34, the rotating electrical machine 40 has the same configuration as that in FIG. 16 described above.

[0116] 34, a refrigerant temperature sensor 221 that detects the refrigerant temperature and a stator temperature sensor 222 that detects the temperature of the stator winding 52 (stator temperature) are provided at a stator coil end SE1 on one of the axial sides of the rotary electric machine 40, the stator coil end SE1 being closer to the first end X1. Each of these temperature sensors 221, 222 has a temperature detection element made of a thermistor. Although each of the temperature sensors 221, 222 is provided at the stator coil end SE1, the sensor mounting configurations are different, so that the refrigerant temperature sensor 221 detects the refrigerant temperature, while the stator temperature sensor 222 detects the temperature of the stator winding 52. Details of this will be described later.

[0117] The detection signals of these temperature sensors 221, 222 are input to the control device 30. The control device 30 estimates the temperature of the field winding 70 based on the detection signals of the temperature sensors 221, 222. At this time, the temperature of the field winding 70 is estimated based on the refrigerant temperature and the stator temperature, for example, using the relationship shown in Fig. 35. At this time, the higher the refrigerant temperature or the stator temperature, the higher the estimated temperature of the field winding 70.

[0118] The mounting structure of each temperature sensor 221, 222 will be described in detail below. Fig. 36 is a plan view of an assembly made up of the stator 50 and the rotor 60 as seen from the axial direction. Note that Fig. 36 is a plan view of the stator 50 and the rotor 60 shown in Fig. 31 as seen from the axial direction, but does not show a detailed illustration of the winding structure of the stator winding 52. In Fig. 36, the portion corresponding to the stator coil end SE1 is shaded.

[0119] As shown in Fig. 36, the stator coil end SE1 of the stator winding 52 is disposed radially outside the coil end cover 103 that covers the rotor coil end of the field winding 70. A neutral point bus bar 223, which serves as the neutral point of the three phase windings in the stator winding 52, is attached to the stator coil end SE1 of the stator winding 52. The neutral point bus bar 223 is disposed radially outside the stator coil end SE1 and extends in the circumferential direction. Fig. 31 shows the state in which the neutral point bus bar 223 is attached to the stator coil end SE1.

[0120] A stator temperature sensor 222 is attached to the neutral point bus bar 223. The stator temperature sensor 222 is attached in contact with the neutral point bus bar 223, and when the neutral point bus bar 223 is heated as a result of current flow through the stator winding 52, the stator temperature sensor 222 detects the temperature of the neutral point bus bar 223 as the temperature of the stator winding 52.

[0121] Additionally, a support member 224 extending radially from the neutral point bus bar 223 is fixed to the neutral point bus bar 223. The support member 224 is preferably made of a resin or the like with low thermal conductivity. The refrigerant temperature sensor 221 is fixed to the tip of the support member 224. As a result, the refrigerant temperature sensor 221 is disposed at a position overlapping the stator coil end SE1 in a plan view of the stator 50 seen from the axial direction. The signal wire extending from the refrigerant temperature sensor 221 is preferably provided along the support member 224.

[0122] Fig. 37 is a front view of a stator 50. In Fig. 37, a stator winding 52 is formed by using a plurality of conductor segments 230 and connecting segment ends 231, which are the ends of the conductor segments 230, by welding or the like. In the stator winding 52, a stator coil end SE2 is formed by bending the conductor segments 230 on one axial side (the lower side of the figure), and a stator coil end SE1 is formed by connecting the segment ends 231 on the other axial side (the upper side of the figure). Note that the stator coil end SE2 corresponds to the "bent side coil end," and the stator coil end SE1 corresponds to the "connection side coil end."

[0123] In the stator coil end SE1, the connection portions between the segment ends 231 are arranged at predetermined intervals in the circumferential direction. The stator 50 is configured such that a plurality of conductor segments 230 are housed radially in the slots 54 of the stator core 51, and the plurality of segment connection portions are arranged radially. The refrigerant temperature sensor 221 is arranged between the connection portions between the segment ends 231 in the circumferential direction. In other words, a radial gap is formed between the connection portions (segment connection portions) between the segment ends 231 in the circumferential direction, and this gap serves as the installation location and refrigerant passage for the refrigerant temperature sensor 221. In this case, the refrigerant temperature sensor 221 is spaced apart from the stator winding 52 (conductor segments 230), restricting heat reception from the stator winding 52. The refrigerant temperature sensor 221 is arranged at a position midway between the stator coil end SE1 in the axial direction.

[0124] 36, it is preferable that isolating members 225 are provided between each of the segment connection portions aligned in the circumferential direction in the stator coil end SE1 to isolate the refrigerant temperature sensor 221 from the conductor segments 230 of the stator coil end SE1. The isolating members 225 are made of a material with excellent heat insulating properties, such as resin. The isolating members 225 are provided at least in the circumferential direction between the refrigerant temperature sensor 221 and the segment connection portions, and function as a heat insulating wall that blocks heat from the conductor segments 230 to the refrigerant temperature sensor 221.

[0125] 38 is a diagram showing the flow of refrigerant from the rotor coil end RE1 side to the stator coil end SE1 side. At rotor coil end RE1, when rotor 60 rotates, refrigerant is discharged from inside the cover to the radially outward direction through refrigerant flow paths (211-213) provided in end plate portion 201 of coil end cover 103 and discharge holes 215 provided in annular portion 202. In this case, refrigerant temperature sensor 221 is disposed radially outward of annular portion 202, so that the refrigerant discharged from the rotor coil end RE1 side reaches refrigerant temperature sensor 221. The refrigerant temperature is then detected by refrigerant temperature sensor 221.

[0126] Here, in a configuration in which the rotor coil end RE1 is covered by the coil end cover 103, the refrigerant introduced into the coil end cover 103 temporarily immerses the rotor coil end RE1, and then is discharged toward the stator coil end SE1 from the discharge hole 215. This ensures sufficient heat exchange between the rotor coil end RE1 and the refrigerant, and the refrigerant temperature sensor 221 detects the refrigerant temperature in a state in which the temperature of the rotor coil end RE1 is fully reflected.

[0127] In the illustrated configuration, the axial positions of discharge hole 215 of annular portion 202 and refrigerant temperature sensor 221 are different. Therefore, the extension direction of discharge hole 215 is oblique to the axial direction so that the refrigerant is discharged obliquely from discharge hole 215 of annular portion 202 toward refrigerant temperature sensor 221 in the axial direction.

[0128] According to the present embodiment described above in detail, the following excellent effects can be obtained.

[0129] In the rotor 60, the end plate portions 181, 201 of the coil end covers 103, 104 are fixed to the rotating shaft 32. This allows the coil end covers 103, 104 to be attached to the rotor 60 in an appropriate manner. Furthermore, one of the coil end covers 103 is configured with an inlet 211, an outlet 212, and a storage portion 213 on the end plate portion 201, while the other coil end cover 104 is configured with an inlet 191, an outlet 192, and a storage portion 193 on the end plate portion 181. In this case, while the rotor 60 is rotating, refrigerant can be temporarily stored in the coil end covers 103, 104, while an appropriate amount of refrigerant can be continuously supplied to the rotor coil ends. As a result, the rotor 60 can be appropriately cooled by the refrigerant.

[0130] In the end plate portions 181, 201 of the coil end covers 103, 104, the opening area (inflow area) of the inlets 191, 211 is made larger than the opening area (outflow area) of the outlets 192, 212. In this case, the refrigerant is more easily introduced into the reservoirs 193, 213, and the refrigerant is appropriately supplied to the outlets 192, 212. Furthermore, due to the continuity theorem, the speed of the refrigerant flowing out from the outlets 192, 212 increases, thereby increasing the flow rate of the refrigerant acting on the field winding 70 and improving cooling efficiency.

[0131] In the end plate portion 181 of the coil end cover 104, the central portion surrounding the rotating shaft 32 is formed as a convex portion 194 that enters the inner space S, and an outlet 192 is provided in the convex portion 194 at a position radially opposite the rotor coil end RE2. This allows the refrigerant that flows out radially from the outlet 192 to be appropriately applied to the rotor coil end RE2 when the rotor is rotating. This allows the field winding 70 to be appropriately cooled.

[0132] The winding unit 110 of the field winding 70 is configured so that the coil end height is higher on the radially outer side than on the radially inner side due to the difference in the number of turns of the conductor wire on the radially inner side. The outlet 192 is provided so as to overlap with a portion of the field winding 70 that is radially inward of the radial center of the winding unit 110 in a plan view of the rotor coil end as seen from the axial direction. In this case, when the rotor rotates, the refrigerant flowing out of the outlet 192 is sprayed onto a lower portion of the rotor coil end RE2, and then flows sequentially from the lower coil end height to the higher coil end height in the rotor coil end RE2. This allows the rotor coil end RE2 to be cooled efficiently.

[0133] In the end plate portion 181 of the coil end cover 104, an outlet 192 is provided for each winding unit 110 (pole coil) of each magnetic pole at a position facing the coil end of the winding unit 110. In this case, the refrigerant can be supplied evenly to the winding units 110 of each magnetic pole, and the field winding 70 can be cooled appropriately.

[0134] A configuration is provided in which multiple protrusions 193b protruding radially inward are provided on outer wall portion 193a on the radially outer side of storage portion 193. This makes it possible to encourage the refrigerant stored in storage portion 193 to flow out from outlet 192 when coil end cover 104 is rotating. It also makes it possible to increase the cooling capacity of the coil end cover itself by the refrigerant.

[0135] Discharge holes 195, 215 that discharge the coolant inside the coil end covers 103, 104 radially outward are provided in the annular portions 182, 202 of the coil end covers 103, 104 at positions axially midway between the stator coil ends. In this case, the coolant used to cool the field winding 70 inside the coil end covers 103, 104 is subsequently used to cool the stator winding 52. This allows the stator winding 52 to be cooled effectively in addition to the field winding 70.

[0136] Discharge holes 195 are provided near apexes 185 that are provided at predetermined intervals in the circumferential direction in the annular portion 182 of the coil end cover 104. In this case, the refrigerant tends to temporarily accumulate near the apexes inside the coil end cover 104, allowing the refrigerant to be properly supplied to the stator coil end SE2 when the rotor is rotating.

[0137] The rotor 60 is configured such that a circuit module 106 carrying electrical components is disposed within the coil end cover 103. This allows the circuit module 106, together with the rotor coil end RE1 of the field winding 70, to be enclosed by the coil end cover 103, thereby providing protection for the circuit module 106. Furthermore, the circuit module 106, which is disposed between an end plate portion 201 of the coil end cover 103 and the field winding 70, is provided with a plurality of through holes 146, 153, and refrigerant flowing out from an outlet 212 of the end plate portion 201 is supplied to the rotor coil end RE1 side via the through holes 146, 153. In this case, even if the circuit module 106 is present between the coil end cover 103 and the rotor coil end RE1, refrigerant injected axially onto the axial end of the rotor 60 can be appropriately supplied to the rotor coil end RE1.

[0138] The refrigerant flow path provided in the end plate portion 201 of the coil end cover 103 is configured to communicate with a first flow path Y1 that supplies the refrigerant to the rotor coil end RE1 side via the component holder 141 and the through holes 146, 153 of the heat sink 151, and with a second flow path Y2 that circulates the refrigerant along the axial end face of the heat sink 151. In this case, in addition to cooling the field winding 70, the circuit module 106 can also be cooled effectively.

[0139] In component holder 141, a portion of bus bar 145 electrically connected to an electric component is configured to cross through holes 146 and 153 of component holder 141 and heat sink 151. In this case, bus bar 145 can be cooled by a refrigerant passing through through holes 146 and 153.

[0140] In the circuit module 106 of the rotor 60, a heat sink 151 is fixed to one of the axial end faces of the component holder 141 so as to axially cover the housing area for housing the electrical components, and the other end face is sealed off by a closing portion 148 so that the electrical components are not exposed. In this configuration, the heat sink 151 can efficiently dissipate heat from the electrical components. Furthermore, at the end face of the component holder 141 opposite the heat sink 151, the closing portion 148 seals off the housing area, thereby preventing the electrical components from being exposed to the refrigerant. As a result, the electrical components in the rotor 60 can be adequately protected from the refrigerant and high cooling performance can be achieved.

[0141] A heat sink 151 is fixed to one of the axial end faces of component holder 141 on the side opposite the rotor core. In this case, heat sink 151 is not subjected to the radiation of heat generated by field winding 70, thereby improving the heat dissipation of the electrical components.

[0142] In component holder 141, a plurality of electrical components are arranged in a circumferential direction around rotation shaft 32. Heat sink 151 is fixed to one axial end face of component holder 141 so as to axially cover the accommodation areas for the electrical components arranged in the circumferential direction in component holder 141. In this case, by distributing the electrical components in a circumferential direction, uneven heat distribution in component holder 141 can be suppressed, and heat can be dissipated effectively by heat sink 151.

[0143] In a configuration in which the coil end of the field winding 70 and the circuit module 106 are covered by the coil end cover 103, a refrigerant flow path is provided that penetrates the end plate portion 201 of the coil end cover 103 in the axial direction, and through holes 146, 153 that extend in the axial direction and communicate with each other are provided in the component holder 141 and the heat sink 151 of the circuit module 106. As a result, when refrigerant is injected axially onto the end plate portion 201 of the coil end cover 103, the refrigerant passes through the end plate portion 201 of the coil end cover 103 and the circuit module 106 and is injected onto the rotor coil end RE1 of the field winding 70. This allows the field winding 70 to be cooled appropriately.

[0144] In the circuit module 106, the heat sink 151 faces the end plate portion 201 of the coil end cover 103 in the axial direction, and the refrigerant flowing out from the refrigerant flow path is circulated through grooves 155 provided on the surface of the heat sink 151 facing the end plate portion 201. In this case, the refrigerant that passes through the end plate portion 201 of the coil end cover 103 effectively dissipates heat from the heat sink 151. This improves the cooling performance of the electrical components in the circuit module 106.

[0145] A sealant is interposed between the joining surfaces of component holder 141 and heat sink 151. This prevents refrigerant, foreign matter, etc. from entering between component holder 141 and heat sink 151.

[0146] Refrigerant temperature sensor 221 is disposed downstream of field winding 70 in the path along which the refrigerant flows within housing 41, and in a state in which heat reception from stator winding 52 is restricted. In this case, the refrigerant flows from field winding 70 toward refrigerant temperature sensor 221 in a state in which the influence of heat from stator winding 52 is suppressed. Therefore, refrigerant temperature sensor 221 detects a refrigerant temperature that depends on the temperature of field winding 70 without being influenced by stator winding 52. As a result, the temperature of field winding 70 can be appropriately estimated using the detection result of refrigerant temperature sensor 221.

[0147] Unlike permanent magnet rotating electric machines, the wound field rotating electric machine 40 generates heat when current is applied to the field winding 70. Therefore, estimating the winding temperature is important for efficient operation of the rotating electric machine 40 and for protecting the field winding 70. In this regard, the rotating electric machine 40 configured as described above can optimize the estimation of the winding temperature. Furthermore, because the winding temperature of the rotor 60 can be accurately estimated, feedback control of the field current can be performed appropriately based on the estimated temperature.

[0148] The stator coil end SE1 of the stator winding 52 is disposed radially outward of the rotor coil end RE1 of the field winding 70, and the refrigerant flows along a path from the rotor coil end RE1 to the stator coil end SE1 when the rotor 60 rotates. The refrigerant temperature sensor 221 is disposed in a position overlapping the stator coil end SE1 of the stator winding 52 in a plan view of the stator 50 seen from the axial direction. In this case, when the refrigerant is sent radially outward by centrifugal force during rotation of the rotor 60, that is, when the refrigerant is sent from the rotor coil end RE1 to the stator coil end SE1, the refrigerant that leaves the rotor coil end RE1 immediately reaches the refrigerant temperature sensor 221. This allows the refrigerant temperature sensor 221 to accurately detect the refrigerant temperature that reflects the temperature of the field winding 70.

[0149] Refrigerant temperature sensor 221 is provided at a position midway between stator coil end SE1 in the axial direction. This allows the refrigerant flowing out from rotor 60 to directly reach refrigerant temperature sensor 221, allowing the temperature detected by refrigerant temperature sensor 221 to properly reflect the temperature of field winding 70.

[0150] In the stator coil end SE1 of the stator winding 52, the refrigerant temperature sensor 221 is disposed between each circumferentially aligned segment connection portion. In this case, a radial gap is formed between each circumferentially aligned segment connection portion, and this gap can be used as a location for installing the refrigerant temperature sensor 221 and as a refrigerant guide passage that guides the refrigerant to the refrigerant temperature sensor 221. This makes it possible to preferably provide the refrigerant temperature sensor 221 at a position that is midway between the stator coil end SE1 in the axial direction.

[0151] An isolating member 225 is provided in the refrigerant flow path at a position downstream of the field winding 70 to isolate the refrigerant temperature sensor 221 from the stator coil end SE1. This provides thermal isolation between the refrigerant temperature sensor 221 and the stator coil end SE1, improving the accuracy with which the refrigerant temperature sensor 221 detects the field winding temperature.

[0152] In the coil end cover 103 covering the rotor coil end RE1 of the field winding 70, a refrigerant flow path provided in the end plate portion 201 takes in the refrigerant into the coil end cover 103, and a discharge hole 215 provided in the annular portion 202 discharges the refrigerant inside the coil end cover 103 radially outward. Also, a refrigerant temperature sensor 221 is disposed at a position radially outward of the annular portion 202. In this case, when the refrigerant is circulated through the coil end cover 103, the refrigerant temporarily immerses the rotor coil end RE1 inside the coil end cover 103, and then is discharged from the discharge hole 215 toward the stator coil end SE1. This ensures sufficient heat exchange between the rotor coil end RE1 and the refrigerant, which provides the effects of cooling the field winding 70 and optimizing temperature detection.

[0153] In a configuration in which a field current flows through the field winding 70 due to excitation caused by energization of the stator winding 52, the temperature of the field winding 70 changes depending on the magnitude of the current flowing through the stator winding 52. In consideration of this, a configuration is adopted in which the temperature of the field winding 70 is estimated based on the detection value of a refrigerant temperature sensor 221 that detects the refrigerant temperature at a position downstream of the field winding 70 and the detection value of a stator temperature sensor 222 that detects the temperature of the stator winding 52. This allows the temperature of the field winding 70 to be estimated with high accuracy.

[0154] (Other embodiments) The above embodiment may be modified as follows, for example.

[0155] The coil end cover 104 may be configured as shown in FIG. 39. The configuration in FIG. 39 is a partial modification of the configuration in FIG. 20. In the coil end cover 104 shown in FIG. 39, an outlet 192 on the downstream side of a storage portion 193 is provided in an end plate portion 181 so as to extend radially. In this case, when the refrigerant flows from the storage portion 193 to the downstream outlet 192, the flow rate of the refrigerant is accelerated by the centrifugal force of the rotation of the rotor 60. This increases the flow rate of the refrigerant as it hits the rotor coil ends, thereby improving the cooling capacity of the field winding 70.

[0156] 40 shows another configuration for the refrigerant flow in the rotor coil end RE1. In this configuration, a first refrigerant passage 241 and a second refrigerant passage 242, through which the refrigerant can pass, are provided at different axial positions in the annular portion 202 of the coil end cover 103. The first refrigerant passage 241 is provided as a refrigerant discharge hole at a position axially away from the rotor core 61, and a refrigerant temperature sensor 221 is disposed radially outward of the first refrigerant passage 241. The second refrigerant passage 242 is provided axially closer to the rotor core 61 than the first refrigerant passage 241. The first refrigerant passage 241 corresponds to the discharge hole 215 in FIG. 38.

[0157] In this case, the refrigerant supplied from the field winding 70 side to the stator winding 52 side is divided into two parts, one flowing toward a range including the refrigerant temperature sensor 221 at the coil end of the stator winding 52 and the other flowing toward a range not including the refrigerant temperature sensor 221. This improves the cooling performance of the coil end of the stator winding 52 while allowing the refrigerant temperature sensor 221 to detect the appropriate refrigerant temperature.

[0158] 41 , the annular portion 202 of the coil end cover 103 may be provided with a first refrigerant passage port 241 and a second refrigerant passage port 242 at mutually different positions in the circumferential direction. Each refrigerant passage port 241, 242 may be provided for each winding unit 110 (pole coil) of each magnetic pole. For example, the first refrigerant passage port 241 may be provided at a position that is the circumferential center of each winding unit 110, and the second refrigerant passage port 242 may be provided at a position between circumferentially adjacent winding units 110 (at a position that is the boundary between each winding unit 110). However, both the first refrigerant passage port 241 and the second refrigerant passage port 242 may be provided at a position between circumferentially adjacent winding units 110.

[0159] The rotating electric machine 40 may be configured to have a refrigerant system for the field winding 70 and a refrigerant system for the stator winding 52 as refrigerant supply systems. In this case, refrigerants are introduced separately from the outside of the housing 41 into the first cooling system for the field winding 70 and the second cooling system for the stator winding 52. Fig. 42 is a diagram showing an example of a configuration having two refrigerant systems. Fig. 42 is a plan view of an assembly consisting of the stator 50 and the rotor 60 as viewed from the axial direction.

[0160] In FIG. 42, the refrigerant supplied by the first cooling system Y11 flows toward the refrigerant temperature sensor 221 via the coil ends of the field winding 70. The refrigerant supply configuration in the first cooling system Y11 is the same as the configuration shown in FIG. 38 and other figures. Meanwhile, in the second cooling system Y12, the refrigerant is supplied to the stator coil ends SE1 of the stator winding 52 from the radially outer side. In the second cooling system Y12, the refrigerant may be supplied to the stator coil ends SE1 by gravity, for example. In addition, a restricting member 251 is provided around the refrigerant temperature sensor 221 to restrict the refrigerant supplied by the second cooling system Y12 from reaching the refrigerant temperature sensor 221. The restricting member 251 is, for example, a barrier provided upstream of the refrigerant temperature sensor 221 in the refrigerant path of the second cooling system Y12.

[0161] In the above configuration, the refrigerant supplied through each of the cooling systems Y11, Y12 can appropriately cool the field winding 70 and the stator winding 52. Furthermore, while the refrigerant flowing through the first cooling system Y11 reaches the refrigerant temperature sensor 221, the refrigerant flowing through the second cooling system Y12 is restricted by the restriction member 251 from reaching the refrigerant temperature sensor 221. This allows for improved accuracy in estimating the temperature of the field winding 70 from the detection value of the refrigerant temperature sensor 221.

[0162] The following configuration may be used as the installation structure for the refrigerant temperature sensor 221.

[0163] Refrigerant temperature sensor 221 may be configured to be fixed to the inner circumferential surface of housing 41. In this case, by locating refrigerant temperature sensor 221 at a position away from stator windings 52, the influence of heat from stator windings 52 can be reduced and the refrigerant temperature can be properly detected.

[0164] The refrigerant temperature sensor 221 may be provided in the air gap between the coil end of the field winding 70 and the coil end of the stator winding 52. In this case, it is possible to detect the temperature of the refrigerant flowing out from the coil end side of the field winding 70 before it reaches the stator coil end.

[0165] The refrigerant temperature sensor 221 may be provided at a position spaced apart from the coil end of the stator winding 52 in the axial direction.

[0166] A refrigerant reservoir for temporarily storing the refrigerant that flows out from the coil end side of the field winding 70 may be provided at the mounting portion where the refrigerant temperature sensor 221 is attached, and the refrigerant temperature sensor 221 may be provided in the refrigerant reservoir so as to be immersed in the refrigerant.

[0167] In the above embodiment, the heat sink 151 is fixed to one of the axial end faces of the part holder 141 on the side opposite the rotor core. However, this may be modified so that the heat sink 151 is fixed to one of the axial end faces of the part holder 141 on the side facing the rotor core.

[0168] The field winding 70 is not limited to a configuration including the first winding portion 71 and the second winding portion 72. For example, the field winding 70 may be configured such that the winding portions for each main pole portion 62 are connected in series without being divided into the first and second winding portions 71, 72, and a diode is connected to both ends of the field winding 70, or a diode and a capacitor are connected in parallel.

[0169] In the stator 50, the stator core may not be provided with teeth.

[0170] The rotating electric machine is not limited to a rotating electric machine used as an in-vehicle main engine, but may also be, for example, a rotating electric machine used as an ISG (Integrated Starter Generator) which is a motor and generator.

[0171] The moving body on which the rotating electric machine system is mounted is not limited to a vehicle, but may be, for example, an aircraft or a ship. Furthermore, the rotating electric machine system is not limited to a system mounted on a moving body, but may be a stationary system.

[0172] The technical ideas extracted from the above-described embodiments will be described below. [Configuration 1] a stator (50) having stator windings (52); a rotor (60) having a rotor core (61) and a field winding (70) wound around the rotor core, the rotor (60) rotating integrally with a rotating shaft (32); a wound-field type rotating electric machine (40) including: a rotor; and a refrigerant is jetted from the axial direction toward an axial end of the rotor; a circuit module (106) having electrical components connected to the field winding and fixed to the rotating shaft is provided at a position on the rotor facing an axial end of the field winding; The circuit module has a component holder (141) for accommodating the electrical component, a heat sink (151) is fixed to one of the axial end faces of the component holder so as to axially cover an accommodation area in the component holder in which the electrical components are accommodated, and at the other end face, the accommodation area is sealed off by a closing portion (148) in a state in which the electrical components are not exposed. [Configuration 2] 2. The wound-field rotating electric machine according to configuration 1, wherein the heat sink is fixed to one of the axial end faces of the part holder opposite to the rotor core. [Configuration 3] the component holder and the heat sink are concentric disk-shaped, The part holder has a receiving portion (147) provided at a position surrounding the rotation shaft, When accommodated in the accommodation portion, the plurality of electrical components are arranged in a circumferential direction around the rotation shaft, 3. The wound-field rotating electric machine according to configuration 1 or 2, wherein the heat sink is fixed to one axial end face of the component holder so as to axially cover the housing areas for the electrical components arranged circumferentially in the component holder. [Configuration 4] the rotor has a coil end cover (103) provided to cover a coil end of the field winding that is axially outward of the rotor core and the circuit module, The refrigerant is injected from the axial direction onto an end plate portion (201) of the coil end cover that extends radially from the rotary shaft, The end plate portion is provided with a refrigerant flow path (211-213) that penetrates the end plate portion in the axial direction and passes the refrigerant from the opposite side of the field winding to the side of the field winding, 4. The wound-field rotating electric machine according to any one of configurations 1 to 3, wherein the component holder and the heat sink in the circuit module are provided with through holes (146, 153) that extend in the axial direction and communicate with each other, and the openings of the through holes on the field winding side face the coil ends of the field winding in the axial direction. [Configuration 5] the rotor has a coil end cover (103) provided to cover a coil end of the field winding that is axially outward of the rotor core and the circuit module, The refrigerant is injected from the axial direction onto an end plate portion (201) of the coil end cover that extends radially from the rotary shaft, The end plate portion is provided with a refrigerant flow path (211-213) that penetrates the end plate portion in the axial direction and passes the refrigerant from the opposite side of the field winding to the side of the field winding, In the circuit module, the heat sink faces the end plate portion of the coil end cover in the axial direction, A wound-field rotating electric machine according to any one of configurations 1 to 4, wherein a groove (155) extending radially is provided on the surface of the heat sink facing the end plate portion, and the refrigerant flowing out of the refrigerant flow path flows through the groove. [Configuration 6] 6. The wound-field rotating electric machine according to any one of configurations 1 to 5, wherein a sealing material is interposed between the joint surfaces of the component holder and the heat sink. [Explanation of symbols]

[0173] 32...rotating shaft, 40...rotating electric machine, 50...stator, 52...stator winding, 60...rotor, 61...rotor core, 70...field winding, 106...circuit module, 141...component holder, 151...heat sink, 148...closure portion.

Claims

1. a stator (50) having stator windings (52); a rotor (60) having a rotor core (61) and a field winding (70) wound around the rotor core, and rotating integrally with a rotating shaft (32); and a wound-field rotating electric machine (40) configured to inject a refrigerant from the axial direction toward an axial end of the rotor, a circuit module (106) having electrical components connected to the field winding and fixed to the rotating shaft is provided at a position on the rotor facing an axial end of the field winding; The circuit module has a component holder (141) for accommodating the electrical component, a heat sink (151) is fixed to one of the axial end faces of the component holder so as to axially cover an accommodation area in the component holder in which the electrical components are accommodated, and at the other end face, the accommodation area is sealed by a closing portion (148) in a state in which the electrical components are not exposed.

2. 2. The wound-field rotating electric machine according to claim 1, wherein the heat sink is fixed to one of the axially opposite end faces of the part holder opposite to the rotor core.

3. the component holder and the heat sink are concentric disk-shaped, The part holder has a receiving portion (147) provided at a position surrounding the rotation shaft, When accommodated in the accommodation portion, the plurality of electrical components are arranged in a circumferential direction around the rotation shaft, 3. The wound-field rotating electric machine according to claim 1, wherein the heat sink is fixed to one axial end face of the component holder so as to axially cover an accommodation area for each of the electrical components arranged circumferentially in the component holder.

4. the rotor has a coil end cover (103) provided to cover a coil end of the field winding that is axially outer than the rotor core and the circuit module, The refrigerant is injected from the axial direction onto an end plate portion (201) of the coil end cover that extends radially from the rotary shaft, The end plate portion is provided with a refrigerant flow path (211 to 213) that penetrates the end plate portion in the axial direction and allows the refrigerant to pass from the opposite side of the field winding to the side of the field winding, 3. The wound-field rotating electric machine according to claim 1, wherein the component holder and the heat sink of the circuit module are provided with through holes (146, 153) that extend in the axial direction and communicate with each other, and an opening of the through hole on the field winding side faces a coil end of the field winding in the axial direction.

5. the rotor has a coil end cover (103) provided to cover a coil end of the field winding that is axially outer than the rotor core and the circuit module, The refrigerant is injected from the axial direction onto an end plate portion (201) of the coil end cover that extends radially from the rotary shaft, The end plate portion is provided with a refrigerant flow path (211 to 213) that penetrates the end plate portion in the axial direction and allows the refrigerant to pass from the opposite side of the field winding to the side of the field winding, In the circuit module, the heat sink faces the end plate portion of the coil end cover in the axial direction, 3. The wound-field rotating electric machine according to claim 1, wherein a groove (155) extending radially is provided on the surface of the heat sink facing the end plate portion, and the refrigerant flowing out of the refrigerant flow path flows through the groove.

6. 3. The wound-field rotating electric machine according to claim 1, wherein a sealing material is interposed between the joining surfaces of said component holder and said heat sink.

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