JP2010239799A - Rotating electric machine and end plate for rotating electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotating electric machine structured to cool a coil end by a cooling medium that has cooled a permanent magnet, and achieves high energy efficiency. <P>SOLUTION: The rotating electric machine MG includes a rotor Ro which is supported to be rotatable radially inside a stator St having the coil end 13 and is provided with the permanent magnet 25. A cooling medium supplied from a rotor shaft 22 cools the permanent magnet 25 and the coil end 13. The rotating electric machine includes: a cooling medium return path 34 through which the cooling medium having cooled the permanent magnet 25 circulates radially inward in the rotor Ro, and a coolant jet nozzle 35 which communicates with a radially inside end of the cooling medium return path 34, is formed at a position radially close to the rotor shaft 22, and jets the cooling medium from the rotor Ro toward the coil end 13. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a rotating electrical machine including a rotor that is rotatably supported around a rotor axis on the radially inner side of a stator having a coil end portion, and in which a plurality of permanent magnets are arranged in the circumferential direction, and so on. The present invention relates to an end plate for a rotating electrical machine used for a rotating electrical machine.

  2. Description of the Related Art Conventionally, a rotating electrical machine including a rotor that is rotatably supported around a rotor shaft core on the radially inner side of a stator having a coil end portion and that has a plurality of permanent magnets disposed in a circumferential direction has been used. In such a rotating electrical machine, when a current is passed through a coil constituting the stator to generate a magnetic field, the coil generates heat due to the generation of Joule heat. The heat generated by the coil increases the electrical resistance of the coil itself and further increases the loss due to Joule heat. Further, as the rotor rotates, an eddy current is generated in the permanent magnet, and the permanent magnet generates heat due to Joule heat caused by the eddy current. The heat generation of the permanent magnet causes irreversible thermal demagnetization and degrades the magnetic properties of the permanent magnet itself.

  In general, a rotating electrical machine used as a motor (electric motor), a generator (generator), etc. is required to have a smaller physique and capable of higher output, so it is important to increase the energy efficiency of the rotating electrical machine. One of the challenges. Therefore, in order to increase the energy efficiency by minimizing the influence of the above-described problem, it is required to efficiently suppress the heat generation of the coil and the permanent magnet.

  As a structure of a rotating electrical machine for cooling coils and permanent magnets, a structure in which a permanent magnet is cooled by a refrigerant supplied from a rotor shaft and a coil end portion is cooled by a refrigerant after cooling the permanent magnet is conventionally used. Known from. For example, in Patent Document 1 below, oil as a refrigerant supplied from a rotor shaft passes through an end plate disposed at one axial end of the rotor core and is supplied to an oil passage in the core in the rotor core. It has been proposed that the permanent magnets are indirectly cooled by cooling the inside. Further, oil is ejected from the oil ejection port provided at the position corresponding to the oil passage in the core of the rotor core in the radial direction of the end plate disposed at the other axial end portion of the rotor core toward the coil end portion. Thus, it has been proposed to cool the coil end portion.

JP 09-182375 A

In the rotating electrical machine described in Patent Document 1, as described above, the oil outlet for ejecting oil toward the coil end portion is provided at a position corresponding to the in-core oil passage of the rotor core in the radial direction in the end plate. ing. Here, from the viewpoint of efficiently performing heat exchange between the oil flowing through the rotor core and the permanent magnet, the radial position of the oil path in the core of the rotor core is closer to the permanent magnet, in other words, In other words, it is preferable that the position is more radially outside the rotor.
However, the more the position where the oil jet outlet is provided on the outer side in the radial direction of the rotor, the larger the radius of rotation of the oil passage in the core and the refrigerant jet outlet. Therefore, the refrigerant has a large kinetic energy as the rotor rotates. become. When the refrigerant is ejected toward the coil end portion at the radial position of the refrigerant outlet, the kinetic energy taken out by the refrigerant increases as the rotational speed of the rotor increases or the flow rate of the refrigerant increases. Since the kinetic energy taken out by the refrigerant is lost, the rotating electrical machine described in Patent Document 1 has a problem that the energy efficiency of the entire rotating electrical machine is reduced.

  Further, as the rotation radius of the oil passage in the core and the refrigerant outlet increases, the moving speed of the oil in the circumferential direction increases as the rotor rotates. Therefore, since the oil ejected from the oil ejection port is ejected at a large initial speed, it may not be possible to secure sufficient time for the heat exchange by contacting the ejected oil and the coil end portion. It was. Such inconvenience is likely to occur because the moving speed of the oil in the circumferential direction increases as the rotational speed (angular speed) of the rotor increases and the oil is injected at a higher initial speed. Therefore, there is still room for improvement in terms of cooling efficiency of the coil end portion.

The present invention has been made in view of the above problems, and in a rotating electrical machine having a structure in which a coil end portion is cooled by a refrigerant after cooling a permanent magnet, the rotating electrical machine capable of realizing high energy efficiency is provided. The purpose is to provide.
Moreover, it aims at providing the end plate for rotary electric machines which can embody such a rotary electric machine easily.

  In order to achieve this object, a rotor having a plurality of permanent magnets arranged in the circumferential direction and rotatably supported around the rotor axis on the radially inner side of a stator having a coil end portion according to the present invention. A rotating electric machine having a structure in which the permanent magnet is cooled by the refrigerant supplied from the rotor shaft and the coil end portion is cooled by the refrigerant after cooling the permanent magnet. A coolant return path through which the coolant after cooling the rotor circulates radially inward, and a radially inner end of the coolant return path, provided in a position close to the rotor shaft in the diameter direction And a refrigerant jet port through which the refrigerant is jetted from the rotor toward the coil end portion.

Here, in the present application, the directions of “axial direction”, “radial direction”, and “circumferential direction” are determined based on the rotor of the rotating electrical machine.
The “position close to the rotor shaft” basically means a position closer to the rotor shaft than the outer diameter end of the rotor. However, when the rotor is provided with an in-core refrigerant path extending in the axial direction therein, and the in-core refrigerant path is provided in a position closer to the rotor shaft in the radial direction than the outer diameter end of the rotor. Means a position radially inward of the position corresponding to the in-core refrigerant path.
The “rotary electric machine” is used as a concept including a motor (electric motor), a generator (generator), and a motor / generator that performs both functions of the motor and the generator as necessary.

According to said characteristic structure, the refrigerant | coolant jet outlet connected to the edge part of the radial inside of the refrigerant | coolant return path through which the refrigerant | coolant after cooling a permanent magnet distribute | circulates is provided close to the rotor shaft in radial direction. So, for example, compared with the case where the refrigerant outlet is provided at a radial position corresponding to the position where the permanent magnet (or the rotor internal refrigerant path when the rotor has an in-core refrigerant path) is arranged, The rotation radius of the refrigerant outlet when the rotor rotates is reduced. Therefore, the kinetic energy taken out by the refrigerant can be reduced, energy loss can be reduced, and the energy efficiency of the entire rotating electrical machine can be improved.
Moreover, the moving speed in the circumferential direction of the refrigerant accompanying the rotation of the rotor can be reduced, and the initial speed of the refrigerant ejected from the refrigerant outlet can be further reduced. Therefore, it is possible to secure a sufficient time for heat exchange by contacting the ejected refrigerant and the coil end portion, and the cooling efficiency of the coil end portion can be improved.
Therefore, according to said characteristic structure, the rotary electric machine which can implement | achieve high energy efficiency can be provided.

  Here, a refrigerant flow path including the refrigerant return path, in which the refrigerant supplied from the rotor shaft flows in one direction toward the refrigerant jet port, is formed in the rotor, and the refrigerant flow path includes the refrigerant flow path. It is preferable that the cross-sectional area of the surface orthogonal to the refrigerant flow direction is substantially the same throughout the refrigerant flow path.

According to this configuration, the refrigerant can be smoothly circulated in the refrigerant distribution path. Therefore, the pipe resistance in the refrigerant flow path in the rotor can be reduced, and energy loss can be reduced. Therefore, also from this point, the energy efficiency of the entire rotating electrical machine can be improved.
In addition, since the refrigerant can be circulated uniformly in one direction in the refrigerant flow path, the refrigerant is prevented from staying in the middle of the refrigerant flow path, and the core and the permanent magnet held in the core are cooled uniformly. can do.

  The rotor includes a substantially cylindrical rotor core that is fixed to the rotor shaft and holds the permanent magnet, and a shaft insertion hole through which the rotor shaft is inserted radially inwardly. An end plate attached to the end plate, and the end plate is provided with a refrigerant supply passage that opens to the shaft insertion hole side and communicates with an in-shaft refrigerant passage provided in the rotor shaft, and the refrigerant outlet It is preferable that the refrigerant outlet is in communication with the refrigerant supply path and is open to the opposite side of the rotor core in the axial direction.

According to this configuration, the refrigerant supply path and the refrigerant jet are respectively provided in the end plate attached to the axial end surface of the rotor core so as to open to the shaft insertion hole side and the coil end side opposite to the rotor core. A structure for cooling the permanent magnet and the coil end portion can be realized with a simple configuration that is simply provided. In this case as well, since the refrigerant jet is provided in the radial direction and close to the rotor shaft, the energy efficiency of the entire rotating electrical machine can be easily improved with a simple configuration.
Further, in this configuration, the entire refrigerant flow path for guiding the refrigerant supplied from the rotor shaft via the refrigerant supply path to the refrigerant outlet provided at a position close to the rotor shaft is formed in the end plate. Can do. Therefore, the refrigerant outlet can be provided close to the rotor shaft in the radial direction without particularly changing the shape of the rotor core. Therefore, the manufacturing process is not particularly complicated and the cost is hardly increased.

  Further, it is preferable that the refrigerant outlet is formed between an outer peripheral surface of the rotor shaft and an inner peripheral surface of the end plate.

According to this configuration, the refrigerant outlet is provided at a position substantially equal to the position of the outer peripheral surface of the rotor shaft in the radial direction. Therefore, in the configuration in which the refrigerant after cooling the permanent magnet is injected toward the coil end portion without returning to the rotor shaft, the rotation radius of the refrigerant outlet can be minimized. Therefore, the moving speed in the circumferential direction of the refrigerant accompanying the rotation of the rotor can be made sufficiently small, and the initial speed of the refrigerant ejected from the refrigerant outlet can be made sufficiently small. Therefore, the kinetic energy taken out by the refrigerant can be sufficiently reduced, and the energy efficiency of the entire rotating electrical machine can be improved.
Note that this configuration is particularly effective because the rotation radius of the refrigerant outlet is sufficiently small, and the above effect can be obtained more reliably even when the rotational speed (angular speed) of the rotor is large.
Moreover, in this structure, since the shaft insertion hole and the refrigerant | coolant jet outlet which comprise the internal peripheral surface of an end plate can be formed integrally, productivity can also be improved.

  The refrigerant supply path extends in the radial direction in the end plate to a magnet position that is a position where the permanent magnet is disposed in the radial direction, and communicates with the refrigerant supply path to the end plate. It is preferable that an in-plate refrigerant path that extends in the circumferential direction at least along the axial end surface of the permanent magnet and further communicates with the refrigerant return path is further provided.

  According to this structure, a permanent magnet can be appropriately cooled indirectly by reliably cooling the area | region including the position corresponding to a magnet position among end plates. In addition, when the cavity part extended in an axial direction is provided between the core and the permanent magnet, a permanent magnet can be directly cooled by distribute | circulating a refrigerant | coolant to the said cavity part to an axial direction. . Moreover, the refrigerant can be appropriately ejected from the refrigerant outlet by causing the refrigerant that has reached the magnet position through the refrigerant supply path to flow through the refrigerant return path. Therefore, both the permanent magnet and the coil end part can be efficiently cooled.

  Further, the in-plate refrigerant path includes a first circumferential refrigerant path that extends in the circumferential direction at the magnet position in the radial direction, and a second circumferential refrigerant path that extends in the circumferential direction radially inward from the magnet position. It is preferable that the refrigerant flow path meandering in the circumferential direction is provided.

  According to this configuration, a wide area in the radial direction including the position corresponding to the magnet position in the radial direction can be reliably cooled in the end plate. Therefore, the permanent magnet can be cooled more efficiently. Therefore, the permanent magnet and the coil end part can be cooled more efficiently.

  In addition, the end plate includes a first end plate and a second end plate, and the rotor further includes a plurality of in-core refrigerant paths distributed in the circumferential direction and extending in the axial direction in the rotor core, The in-core refrigerant path communicates with the refrigerant supply path provided in the first end plate on one axial side, and communicates with the refrigerant outlet provided on the second end plate on the other axial side. It is preferable to adopt the configuration.

  According to this configuration, the rotor core can be reliably cooled from the inside by the refrigerant flowing through the in-core refrigerant path from the one axial side to the other axial side, and the permanent magnet can be appropriately cooled indirectly. it can. In addition, on the other side in the axial direction, the refrigerant can be appropriately ejected from the refrigerant outlet provided in the second end plate. Therefore, both the permanent magnet and the coil end part can be efficiently cooled.

  In addition, for each of the core refrigerant paths that form a pair among the plurality of refrigerant paths in the core, the flow directions of the refrigerant that flow in the axial direction through the pair of refrigerant paths in the core are opposed to each other. A configuration is preferable.

According to this configuration, it is possible to form a refrigerant flow path that is substantially mirror-symmetric with respect to a plane imaginary at the axial central portion of the rotor core for the refrigerant flowing through each of the paired core refrigerant paths. Therefore, the rotor core can be cooled substantially uniformly in the axial direction. In addition, by forming a plurality of such a set of in-core refrigerant paths in the circumferential direction by dispersing them in the circumferential direction, the entire rotor core can be cooled substantially uniformly. Further, the coil end portions at both axial end portions can be cooled substantially uniformly.
Thus, by cooling the permanent magnet and the coil end portion substantially uniformly, the cooling efficiency can be improved and the performance of the rotating electrical machine can be stabilized.

  According to the present invention, the characteristic configuration of the end plate for a rotating electrical machine having a substantially disk shape attached to the axial end surface of the rotor core that constitutes the rotor of the rotating electrical machine is such that the rotating shaft of the rotor provided in the radial direction is inserted. A shaft insertion hole, a refrigerant supply port that opens in the radial direction to the shaft insertion hole side, a refrigerant return path that extends in the radial direction, and an opening that is opposite to the side that is attached to the rotor core in the axial direction. A refrigerant flow path that communicates with a radially inner end of the refrigerant return path and that communicates with the refrigerant outlet provided in the radial direction in the vicinity of the shaft insertion hole, the refrigerant supply port, and the refrigerant return path. It is in the point provided with.

According to this characteristic configuration, since the refrigerant outlet that communicates with the radially inner end of the refrigerant return path is provided close to the shaft insertion hole in the radial direction, the rotor shaft is connected via the shaft insertion hole. The rotation radius of the refrigerant outlet can be reduced when the rotor is rotated while being attached to the. For this reason, when supplying the refrigerant from the refrigerant supply port, circulating the refrigerant in the end plate and ejecting it from the refrigerant jet outlet, the moving speed in the circumferential direction of the refrigerant accompanying the rotation of the rotor is reduced, and the initial speed of the refrigerant to be ejected Can be reduced. Therefore, the kinetic energy taken out by the refrigerant can be reduced to reduce energy loss, and the energy efficiency of the entire rotating electrical machine can be improved. In addition, it is possible to secure a sufficient time for heat exchange by contacting the ejected refrigerant and the coil end portion, and the cooling efficiency of the coil end portion can be improved. Therefore, it is possible to provide a rotating electrical machine end plate capable of realizing a rotating electrical machine capable of realizing high energy efficiency.
In addition, the permanent magnet with which a rotor is indirectly provided based on cooling of an end plate is set as the structure by which the said end plate is cooled by the refrigerant | coolant which distribute | circulates the refrigerant | coolant distribution path which connects a refrigerant | coolant supply port and a refrigerant | coolant return path. Can be cooled. Therefore, according to the above characteristic configuration, the permanent magnet is indirectly cooled by the refrigerant supplied from the rotor shaft based on the cooling of the end plate, and the coil end portion is cooled by the refrigerant after the permanent magnet is cooled. It is possible to provide a rotating electrical machine end plate that can easily realize a rotating electrical machine that is excellent in energy efficiency.

  Another feature of the substantially disk-shaped end plate for a rotating electrical machine attached to the axial end surface of the rotor core constituting the rotor of the rotating electrical machine according to the present invention is the rotation of the rotor provided on the radially inner side. A shaft insertion hole through which the shaft is inserted, a refrigerant supply port that opens in the radial direction toward the shaft insertion hole, a refrigerant return path that extends in the radial direction, and an opening in the attachment side that is the side that is attached to the rotor core in the axial direction The first opening and the second opening that open to the side opposite to the mounting side in the axial direction, communicate with the radially inner end of the refrigerant return path, and to the shaft insertion hole in the radial direction It is in the point provided with the refrigerant | coolant ejection port provided adjacently, the said refrigerant | coolant supply port, said 1st opening part, and the refrigerant | coolant distribution path which each communicates said 2nd opening part and the said refrigerant | coolant return path.

According to this characteristic configuration, since the refrigerant outlet that communicates with the radially inner end of the refrigerant return path is provided close to the shaft insertion hole in the radial direction, the rotor shaft is connected via the shaft insertion hole. The rotation radius of the refrigerant outlet can be reduced when the rotor is rotated while being attached to the. Therefore, when the refrigerant is supplied from the refrigerant supply port via the first opening and the second opening, and the refrigerant is circulated through the end plate and ejected from the refrigerant outlet, the circumferential direction of the refrigerant accompanying the rotation of the rotor The moving speed can be reduced, and the initial speed of the jetted refrigerant can be reduced. Therefore, the kinetic energy taken out by the refrigerant can be reduced to reduce energy loss, and the energy efficiency of the entire rotating electrical machine can be improved. In addition, it is possible to secure a sufficient time for heat exchange by contacting the ejected refrigerant and the coil end portion, and the cooling efficiency of the coil end portion can be improved. Therefore, it is possible to provide a rotating electrical machine end plate capable of realizing a rotating electrical machine capable of realizing high energy efficiency.
Note that a refrigerant flow path that connects the refrigerant supply port and the first opening, and a refrigerant flow path that connects the second opening and the refrigerant return path are both ends of the in-core refrigerant path provided in the rotor core, respectively. By configuring the rotor core to be cooled by the refrigerant flowing through the in-core refrigerant path, the permanent magnet included in the rotor can be indirectly cooled based on the cooling of the rotor core. Therefore, according to the above characteristic configuration, the permanent magnet is indirectly cooled by the refrigerant supplied from the rotor shaft based on the cooling of the rotor core, and the coil end portion is cooled by the refrigerant after cooling the permanent magnet. It is possible to provide an end plate for a rotating electrical machine that can easily realize a rotating electrical machine that is excellent in energy efficiency.

  Here, in the end plate for a rotating electrical machine having the above-described characteristic configuration, the refrigerant flow path including the refrigerant return path is formed as a groove having a shape recessed with respect to the attachment surface with the core. It is preferable that the cross-sectional area is substantially the same throughout the groove.

  According to this configuration, by attaching the end plate for the rotating electrical machine to the axial end surface of the core of the rotating electrical machine, the groove portion easily forms a refrigerant flow path including the coolant return path between the core and the end plate. can do. In that case, the cross-sectional area of the surface orthogonal to the refrigerant flow direction in the refrigerant flow path can be made substantially the same over the entire refrigerant flow path. Therefore, the refrigerant can be smoothly circulated in the refrigerant distribution path, and the pipe line resistance can be reduced to reduce the energy loss. Therefore, also from this point, a rotating electrical machine excellent in energy efficiency can be easily realized.

FIG. 3 is an axial development view of a hybrid drive device including a rotating electrical machine according to the present invention. It is an axial sectional view of the rotating electrical machine according to the first embodiment. It is III-III sectional drawing in FIG. It is IV-IV sectional drawing in FIG. It is a disassembled perspective view of the rotor which concerns on 1st embodiment. It is a disassembled perspective view of the rotor which concerns on 2nd embodiment. It is sectional drawing of the surface orthogonal to the axial direction of the 1st end plate which concerns on 2nd embodiment. It is sectional drawing of the surface orthogonal to the axial direction of the 2nd end plate which concerns on 2nd embodiment. It is sectional drawing of the surface orthogonal to the axial direction of the end plate which concerns on 3rd embodiment. It is sectional drawing of the surface orthogonal to the axial direction of the end plate which concerns on 4th embodiment.

[First embodiment]
A first embodiment of a rotating electrical machine according to the present invention will be described with reference to the drawings. The rotating electrical machine MG according to the present embodiment is supported rotatably around the axis of the rotor shaft 22 on the radially inner side of the stator St having the coil end portion 13, and a plurality of permanent magnets 25 are disposed in the circumferential direction. Rotor Ro (see FIG. 2). The permanent magnet 25 is cooled by the refrigerant supplied from the rotor shaft 22, and the coil end portion 13 is cooled by the refrigerant jetted from the rotor Ro after the permanent magnet 25 is cooled. In the rotary electric machine MG according to the present embodiment, in such a configuration, the refrigerant outlet 35 from which the refrigerant is ejected from the rotor 21 is provided in the axial direction end portion Le of the rotor 21 close to the rotor shaft 22. It is characterized in that
Thereby, it is possible to reduce energy loss by appropriately reducing the permanent magnet 25 and the coil end portion 13 included in the rotor Ro of the rotating electrical machine MG and reducing the kinetic energy taken out by the refrigerant. The energy efficiency of the entire electric machine MG is improved.
Hereinafter, the rotating electrical machine MG according to the present embodiment will be described in detail. Hereinafter, a case where the rotating electrical machine MG according to the present embodiment is applied to the rotating electrical machine included in the hybrid drive device 1 will be described as an example.

1. Configuration of Drive Device First, the overall configuration of the hybrid drive device 1 including the rotating electrical machine MG according to the present embodiment will be described. FIG. 1 is an axial development view of the hybrid drive device 1. The hybrid drive device 1 is connected to an engine E as a drive force source, and is a two-motor split type hybrid drive device including two rotating electrical machines MG1 and MG2.
In the present embodiment, the present invention is applied to both the first rotating electrical machine MG1 and the second rotating electrical machine MG2. Therefore, in the present specification, when there is no particular need to distinguish between them, these are collectively referred to as “rotating electric machine MG”.

As shown in FIG. 1, the hybrid drive device 1 includes an input shaft I that is drivingly connected to an engine E, an output shaft O that is drivingly connected to a wheel (not shown), a first rotating electrical machine MG1, and a second rotating electrical machine MG2. And a planetary gear mechanism PG as a power distribution device, a counter gear mechanism C, and a differential device D as main components.
In the present embodiment, the planetary gear device PG and the first rotating electrical machine MG1 are arranged coaxially with the input shaft I, and the second rotating electrical machine MG2, the counter speed reduction mechanism C, and the differential device D are respectively connected to the input shaft I. Are arranged parallel to each other on different axes. That is, the hybrid drive device 1 includes an input shaft I, a planetary gear device PG, a first shaft A1 on which the first rotating electrical machine MG1 is disposed, a second shaft A2 on which the second rotating electrical machine MG2 is disposed, and a counter reduction mechanism. The four-axis configuration includes a third axis A3 on which C is arranged and a fourth axis A4 on which the differential device D is arranged. These components are accommodated in the case 2.

  The input shaft I is drivingly connected to the engine E. Here, the engine E is an internal combustion engine driven by combustion of fuel, for example, a gasoline engine or a diesel engine. The input shaft I is drivably coupled to an engine output shaft Eo such as a crankshaft of the engine E via a damper d. Further, the input shaft I is connected to the carrier ca of the planetary gear device PG.

The first rotating electrical machine MG1 includes a first stator St1 fixed to the case 2 and a first rotor Ro1 that is rotatably supported on the radially inner side of the first stator St1. The first rotor Ro1 of the first rotating electrical machine MG1 is connected to rotate integrally with the sun gear s of the planetary gear device PG.
The second rotating electrical machine MG2 includes a second stator St2 fixed to the case 2 and a second rotor Ro2 that is rotatably supported on the radially inner side of the second stator St2. The second rotor Ro2 of the second rotating electrical machine MG2 is connected to rotate integrally with the second rotating electrical machine output gear h.

  The first rotating electrical machine MG1 and the second rotating electrical machine MG2 are electrically connected to a battery as a power storage device via an inverter device In. The first rotating electrical machine MG1 and the second rotating electrical machine MG2 are controlled by the inverter device In, and each function as a motor (electric motor) that receives power supply and generates power, and receives power and receives power. It is possible to fulfill both functions as a generated generator (generator).

  In the present embodiment, both the first stator St1 and the second stator St2 correspond to the “stator” in the present invention, and both the first rotor Ro1 and the second rotor Ro2 correspond to the “rotor” in the present invention. To do. Therefore, in the present specification, unless it is particularly necessary to distinguish between them, they are collectively referred to as a stator St and a rotor Ro, respectively.

  The planetary gear device PG includes a carrier ca that supports a plurality of pinion gears, and a sun gear s and a ring gear r that mesh with the pinion gears, respectively, as rotating elements. The sun gear s is connected to rotate integrally with the rotation shaft of the first rotor Ro1 of the first rotating electrical machine MG1. The carrier ca is coupled to rotate integrally with the input shaft I. The ring gear r is connected as an output rotation element so as to rotate integrally with the output gear g. The planetary gear device PG functions as a power distribution device. That is, the rotational driving force of the engine E transmitted through the carrier ca is distributed to the first rotating electrical machine MG1 and the output gear g through the sun gear s and the ring gear r, respectively.

  At this time, the engine E outputs a positive torque corresponding to the required driving force from the vehicle side while being controlled so as to be maintained in a state where the efficiency is high and the exhaust gas is low (generally along the optimum fuel consumption characteristics). Torque is transmitted to the carrier ca via the input shaft I. On the other hand, the first rotating electrical machine MG1 transmits the reaction force of the torque of the input shaft I to the sun gear s by outputting a negative torque. That is, the first rotating electrical machine MG1 functions as a reaction force receiver that supports the reaction force of the torque of the input shaft I, whereby the torque of the input shaft I is distributed to the output gear g.

Thus, in the hybrid drive device 1 in this example, the first rotating electrical machine MG1 generates power by the rotational driving force of the input shaft I (engine E) that is input mainly through the planetary gear device PG, and the power storage device Or a generator that supplies electric power for driving the second rotating electrical machine MG2. However, the first rotating electrical machine MG1 may function as a motor that outputs a driving force by powering when the vehicle is traveling at high speed or when the engine E is started.
On the other hand, the second rotating electrical machine MG2 mainly functions as a motor that assists the driving force for traveling the vehicle. However, the second rotating electrical machine MG2 may function as a generator to regenerate the inertial force of the vehicle as electric energy when the vehicle is decelerated.

The output gear g is drivingly connected to the counter reduction mechanism C. The counter deceleration mechanism C is drivingly connected to the differential device D. Accordingly, the rotational driving force of the engine E distributed by the planetary gear device PG and transmitted to the output gear g can be transmitted to a wheel (not shown) via the counter reduction mechanism C, the differential device D, and the output shaft O. Yes.
The counter gear mechanism C is also drivingly connected to the second rotating electrical machine output gear h. Therefore, the rotational driving force of the second rotating electrical machine MG2 can be transmitted to a wheel (not shown) via the counter reduction mechanism C, the differential device D, and the output shaft O. Thereby, it is possible to assist the driving force for driving the vehicle.
The differential device D distributes the rotational driving force transmitted to the differential device D and transmits it to the two wheels.

  Further, the hybrid drive device 1 according to the present embodiment includes an oil pump OP. In this example, the oil pump OP is an inscribed gear pump having an inner rotor and an outer rotor. The rotating shaft of the inner rotor is drivingly connected to the input shaft I through a gear train (not shown), and the oil pump OP is driven by the rotational driving force of the input shaft I (engine E). The oil discharged by the oil pump OP is a shaft oil path 41i, 41a provided in the inner periphery of the input shaft I, the rotor shaft 22a of the first rotating electrical machine MG1, and the rotor shaft 22b of the second rotating electrical machine MG2. This is used for the purpose of cooling the first rotating electrical machine MG1 and the second rotating electrical machine MG2 or lubricating the planetary gear device PG, the output gear g, the counter speed reduction mechanism C, and the like via 41b. In the present embodiment, this oil corresponds to the “refrigerant” in the present invention. The in-shaft oil passages 41a and 41b correspond to the “in-shaft refrigerant passage” in the present invention.

2. Next, the configuration of the rotating electrical machine MG according to the present embodiment will be described. As shown in FIG. 2, the rotating electrical machine MG includes a stator St fixed to the case 2 and a rotor Ro that is rotatably supported on the radially inner side of the stator St.
The stator St includes a substantially cylindrical stator core 12 and a coil wound around the stator core 12. The stator core 12 is configured by laminating a plurality of electromagnetic steel plates. The stator core 12 has a plurality of slots (not shown) that are distributed in the circumferential direction and extend in the axial direction, and a coil made of a conductor is wound around the slots. In the present embodiment, the stator St is a stator St used for the rotating electrical machine MG driven by a three-phase alternating current, and includes a three-phase coil of U phase, V phase, and W phase. And the part which protrudes in the axial direction both sides of the stator core 12 among each coil is used as the coil end part 13.

The rotor Ro includes a substantially cylindrical rotor core 23 fixed to the rotor shaft 22, a plurality of permanent magnets 25 held by the rotor core 23, and end plates 26a and 26b attached to the axial end surface 23a of the rotor core 23. I have.
The rotor shaft 22 is rotatably supported by the case 2 via bearings on both axial sides of the rotating electrical machine MG. An in-shaft oil passage 41 is formed in the inner peripheral portion of the rotor shaft 22. In addition, an axial supply oil passage 42 that communicates with the in-shaft oil passage 41 and extends radially outward from the in-shaft oil passage 41 and opens to the outer peripheral surface of the rotor shaft 22 at the axial end Le of the rotating electrical machine MG. Is formed.

  The rotor core 23 is configured by laminating a plurality of electromagnetic steel plates. As shown in FIGS. 3 and 4, the rotor core 23 has a plurality of magnet insertion portions 24 each including a hollow portion that are distributed in the circumferential direction and extend in the axial direction. A plurality of permanent magnets 25 are inserted between the pair of magnet insertion portions 24 in the axial direction and fixedly held. In this example, a set of two permanent magnets 25 are fixed in a V shape by a total of four magnet insertion portions 24. At this time, the permanent magnets 25 are arranged so that the directions of the magnetic fields with respect to the stator St are alternately opposite along the circumferential direction of the rotor Ro. In other words, the permanent magnets 25 are arranged so that N poles and S poles appear alternately along the circumferential direction of the rotor Ro as viewed from the outside in the radial direction of the rotor Ro.

  In the present embodiment, a plurality of oil passages 45 in the core are further formed in the rotor core 23 so as to be distributed in the circumferential direction and extend in the axial direction. In the illustrated example, the core internal oil passage 45 has a radial length from the inner peripheral surface of the shaft insertion hole 31 to the core inner oil passage 45 from the inner peripheral surface of the shaft insertion hole 31 to the outer peripheral surface of the rotor core 23. It is formed at a radial position that is about 1/3 of the radial length. In this example, eight in-core oil passages 45 are uniformly distributed in the circumferential direction. In the present embodiment, the in-core oil passage 45 corresponds to the “in-core refrigerant passage” in the present invention.

  End plates 26 a and 26 b are attached to the axial end surface 23 a of the rotor core 23 at both axial ends Le. These end plates 26 a and 26 b hold the permanent magnet 25 inserted into the magnet insertion portion of the rotor core 23 integrally with the rotor core 23 and also function as a retainer for fixing the rotor core 23 to the rotor shaft 22. Have. In the present embodiment, one of the end plates 26a and 26b corresponds to the “first end plate” in the present invention, and the other corresponds to the “second end plate” in the present invention. In the following description, for convenience, the end plate on one axial side (left side in FIG. 2) is referred to as a first end plate 26a, and the end plate on the other axial side (right side in FIG. 2) is referred to as a second end plate 26b. To do. In addition, when it is not necessary to distinguish in particular, these shall be called the end plate 26 and shall be comprehensively described.

  The end plate 26 is formed of aluminum, a dust core, a cold rolled steel plate, or the like, and is formed in a substantially disk shape that covers the entire axial end surface 23 a of the rotor core 23. A shaft insertion hole 31 through which the rotor shaft 22 of the rotor Ro is inserted is provided on the radially inner side (radially central portion) of the end plate 26. The periphery of the shaft insertion hole 31 is an inner peripheral surface 26 i of the end plate 26. The inner peripheral surface 26 i of the end plate 26 is formed so as to be located on the same plane that is continuous with the inner peripheral surface of the rotor core 23. Then, the rotor core 23 and the end plate 26 are in contact with the rotor shaft 22 in a state where the inner peripheral surface 26i of the end plate 26 and the inner peripheral surface of the rotor core 23 and the outer peripheral surface 22o of the rotor shaft 22 are in contact with each other. It is fixed.

  Inside the rotor shaft 22, the rotor core 23, and the end plate 26, a refrigerant flow path through which oil as a refrigerant flows is formed. As described above, the in-shaft oil passage 41 and the in-shaft supply oil passage 42 are formed in the rotor shaft 22, and the in-core oil passage 45 is formed in the rotor core 23. Inside the end plate 26, a refrigerant flow path for communicating the in-shaft oil path 41, the in-shaft supply oil path 42, and the in-core oil path 45, and a refrigerant for communicating the in-core oil path 45 and the outside of the rotor Ro. Distribution channels are formed. In the present embodiment, the oil as the refrigerant flows in one direction in these refrigerant flow paths, and the cross-sectional area of the surface perpendicular to the oil flow direction is substantially the same throughout the refrigerant flow path. ing. Hereinafter, the configuration of the end plate 26 will be described in detail mainly focusing on the configuration of the refrigerant flow path.

3. Configuration of End Plate As shown in FIGS. 3 to 5, the end plate 26 according to this embodiment includes a shaft insertion hole 31, an oil supply port 32 a, a supply oil passage 32, a first opening 38, a second opening 39, A return oil passage 34 and an oil outlet 35 are provided.
The oil supply port 32a is an opening that opens toward the shaft insertion hole 31 in the radial direction. In the present embodiment, the four oil supply ports 32a are formed so as to be evenly distributed in the circumferential direction. The oil supply port 32a is provided at a position corresponding to the in-axis supply oil passage 42 formed in the rotor shaft 22 in the axial direction. From each oil supply port 32a, a supply oil passage 32 is formed so as to extend radially outward in the end plate 26. Thus, the supply oil passage 32 communicates with an in-shaft supply oil passage 42 formed in the rotor shaft 22 via the oil supply port 32a. In this example, the supply oil passage 32 extends to a radial position corresponding to the in-core oil passage 45 in the rotor core 23. In the present embodiment, the oil supply port 32a corresponds to the “refrigerant supply port” in the present invention, and the supply oil passage 32 corresponds to the “refrigerant supply channel” in the present invention.

  In the first end plate 26a, the radially outer end of the supply oil passage 32 is connected to one end of a communication oil passage 37 extending in the circumferential direction. The other end of the communication oil passage 37 communicates with the first opening 38. Here, the 1st opening part 38 is an opening part opened to the surface (henceforth the attachment surface 26t) side attached to the rotor core 23 in an axial direction. The first opening 38 is formed at a radial position corresponding to the in-core oil passage 45 in the rotor core 23. Further, in this example, the four first openings 38 are formed to be distributed with a predetermined deviation with respect to a state in which they are uniformly distributed in the circumferential direction. Further, four second openings 39 are formed on the attachment surface 26t of the end plate 26 in a distributed manner with a predetermined deviation with respect to a state in which they are equally distributed in the circumferential direction. A total of eight openings including the four first openings 38 and the four second openings 39 are formed so as to be evenly distributed in the circumferential direction corresponding to the circumferential position of the oil passage 45 in the core. Yes. The second opening 39 communicates with the radially outer end of the return oil passage 34 extending in the radial direction. The return oil passage 34 extends radially inward from the second opening 39, and its radially inner end is connected to the oil jet 35. In the present embodiment, the return oil passage 34 corresponds to the “refrigerant return passage” in the present invention, and the oil ejection port 35 corresponds to the “refrigerant ejection port” in the present invention.

  On the other hand, in the second end plate 26 b, the radially outer end of the supply oil passage 32 communicates directly with the first opening 38. Since the arrangement of the first opening 38 and the second opening 39 in the second end plate 26b is the same as that of the first end plate 26a, the description thereof is omitted here. The second opening 39 communicates with an end (circumferential end) on one side of a return oil passage 34 that extends after a predetermined length in the circumferential direction and then bends and extends in the radial direction. The other end (radially inner end) of the return oil passage 34 is connected to the oil jet 35.

  In the present embodiment, the supply oil passage 32, the communication oil passage 37 and the return oil passage 34 are formed between the attachment surface 26 t of the end plate 26 and the axial end surface 23 a of the rotor core 23. In the present embodiment, the supply oil passage 32, the communication oil passage 37, and the return oil passage 34 are formed as groove portions having a concave shape with respect to the attachment surface 26 t of the end plate 26. In this example, as shown in FIG. 5, these oil passages are formed integrally with the mounting surface 26 t by cutting the mounting surface 26 t of the end plate 26. In the present embodiment, the cross-sectional areas of the groove portions that form the supply oil passage 32, the communication oil passage 37, and the return oil passage 34 are substantially the same throughout the groove portions. Here, the “cross-sectional area of the groove portion” is a cross-sectional area of a concave portion with respect to the mounting surface 26t of the end plate 26, and the end plate 26 is attached to the axial end surface 23a of the rotor core 23. These oil passages are used as a concept representing a cross-sectional area of a surface orthogonal to the oil flow direction when oil as a refrigerant flows. Further, in the present embodiment, these cross-sectional areas are set so as to be substantially equal to the cross-sectional area of the surface in the core oil passage 45 that is orthogonal to the direction of oil flow. Further, in the present embodiment, the first end plate 26a thus formed has the other end side of the communication oil passage 37 in the first end plate 26a, and the supply oil passage 32 in the second end plate 26b. The end portion on the radially outer side is the first opening 38. Similarly, the radially outer end of the return oil passage 34 thus formed is a second opening 39. That is, in the present embodiment, the first opening 38 and the second opening 39 are also formed between the mounting surface 26 t of the end plate 26 and the axial end surface 23 a of the rotor core 23.

  The oil outlet 35 opens in the axial direction on both the mounting surface 26t side and the side opposite to the mounting surface 26t, and is provided close to the shaft insertion hole 31 in the radial direction. In the present embodiment, the oil outlet 35 is formed between the outer peripheral surface 22 o of the rotor shaft 22 and the inner peripheral surface 26 i of the end plate 26. In this example, as shown in FIG. 5, the oil outlet 35 is formed integrally with the inner peripheral surface 26 i by notching a part of the inner peripheral surface 26 i (around the shaft insertion hole 31) of the end plate 26. Has been. The oil outlet 35 formed in this way is located on the innermost peripheral side of the end plate 26 in the radial direction.

  In the present embodiment, as shown in FIG. 2, the supply oil passage 32 formed in the first end plate 26 a and the second end plate 26 a, 26 b are attached to the axial end surface 23 a of the rotor core 23. The oil outlet 35 formed in the second end plate 26b communicates with the supply oil passage 32 formed in the second end plate 26b and the oil outlet 35 formed in the first end plate 26a. It is configured. Specifically, the supply oil passage 32 of the first end plate 26a and the oil outlet 35 of the second end plate 26b are connected to the communication oil passage 37 and the first opening 38 of the first end plate 26a, and the oil in the core. The passage 45 communicates with each other through the second opening 39 and the return oil passage 34 of the second end plate 26b. Further, the supply oil passage 32 of the second end plate 26b and the oil outlet 35 of the first end plate 26a are the first opening 38 of the second end plate 26b, the oil passage 45 in the core, and the first end plate. The second opening 39 of 26a and the return oil passage 34 communicate with each other. And the oil as a refrigerant | coolant which distribute | circulates the inside of the refrigerant | coolant distribution path formed of these oil paths distribute | circulates from the supply oil path 32 toward the oil jet 35 in one direction.

4). Next, the cooling structure of the rotating electrical machine MG according to this embodiment will be described. In addition, in FIG. 2, the distribution direction of the oil as the refrigerant is indicated by an arrow.
Oil discharged from the oil pump OP by the rotational driving force of the engine E is supplied to an in-shaft oil passage 41 formed in the rotor shaft 22. While the rotary electric machine MG is driven, the oil supplied to the in-shaft oil passage 41 flows in the axial direction along the inner peripheral surface of the in-shaft oil passage 41 by centrifugal force as the rotor Ro rotates. Similarly, the centrifugal force causes oil to flow into the supply oil passage 32 of the first end plate 26a via the in-shaft supply oil passage 42 formed on one side in the axial direction. Further, the oil flows into the supply oil passage 32 of the second end plate 26b through the in-shaft supply oil passage 42 formed on the other side in the axial direction by centrifugal force. In addition, the refrigerant | coolant flow path from the supply oil path 32 of the 1st end plate 26a to the oil jet outlet 35 of the 2nd end plate 26b, and the oil jet opening of the 1st end plate 26a from the supply oil path 32 of the 2nd end plate 26b The refrigerant flow path leading to 35 is substantially mirror-symmetric with respect to a plane imaginary in the central portion of the rotor core 23 in the axial direction. Therefore, in order to avoid overlapping description, only the cooling by the former refrigerant flow path will be described below. To do.

  The oil that has flowed into the supply oil passage 32 circulates outward in the radial direction, then flows through the communication oil passage 37, and flows into the in-core oil passage 45 in the rotor core 23 through the first opening 38. During the rotation of the rotating electrical machine MG, the oil that has flowed into the oil passage 45 in the core along with the rotation of the rotor Ro flows in the axial direction along the inner peripheral surface on the radially outer side of the oil passage 45 in the core due to centrifugal force. . At that time, the rotor core 23 is cooled by heat conduction between the oil and the electromagnetic steel plates constituting the rotor core 23. When the rotor core 23 is cooled, the permanent magnet 25 is cooled by heat conduction between the electromagnetic steel plate constituting the rotor core 23 and the permanent magnet 25. In this way, the oil cools the rotor core 23, whereby the permanent magnet 25 is indirectly cooled.

  The oil that has cooled the rotor core 23 and the permanent magnet 25 while flowing through the in-core oil passage 45 in the axial direction flows into the return oil passage 34 of the second end plate 26 b through the second opening 39. The oil that has flowed into the return oil passage 34 flows inward in the radial direction. Thereafter, the oil reaches the oil ejection port 35 and is ejected from the oil ejection port 35 toward the coil end portion 13. Note that the oil ejection grooves 36 are formed radially on the end plate 26, and the oil moves in the radial direction along the oil ejection grooves 36 when viewed from the rotating end plate 26. The oil reaches the coil end portion 13 of the stator St disposed on the outer side in the axial direction of the rotor 23 in the axial direction Le, and between the oil and the conductor constituting the coil end portion 13. The coil end portion 13 is cooled by heat conduction.

  When oil is ejected from the oil ejection port 35, the oil is ejected in the tangential direction of the rotation trajectory of the oil ejection port 35 with the circumferential speed immediately before being ejected as an initial speed. Here, in the present embodiment, the oil ejection port 35 is formed between the outer peripheral surface 22o of the rotor shaft 22 and the inner peripheral surface 26i of the end plate 26, and is the innermost periphery of the end plate 26 in the radial direction. Located on the side. Therefore, the rotation radius of the oil jet 35 is sufficiently smaller than the rotation radius of the oil passage 45 in the core, and the movement speed in the circumferential direction of the oil just before being ejected is the movement in the circumferential direction of the oil passage 45 in the core. Small enough than the speed. Therefore, the kinetic energy taken out by the oil as the refrigerant can be reduced to reduce the energy loss, and the energy efficiency of the entire rotating electrical machine MG can be improved. In addition, since the oil is ejected at a sufficiently small initial speed, it is possible to secure a sufficient time for heat exchange by contact between the oil and the conductor constituting the coil end portion 13. Therefore, the cooling efficiency of the coil end part 13 can be improved. Thus, by improving the cooling efficiency, the energy efficiency of the rotating electrical machine MG can be improved as a result.

  In the present embodiment, the surface of the refrigerant flow path (the supply oil path 32, the communication oil path 37, and the return oil path 34) formed between the rotor core 23 and the end plate 26 is orthogonal to the oil flow direction. The cross-sectional area is substantially the same throughout the refrigerant flow path. Further, in the present embodiment, these cross-sectional areas are set so as to be substantially equal to the cross-sectional area of the surface in the core oil passage 45 that is orthogonal to the direction of oil flow. Therefore, the refrigerant flow path from the supply oil path 32 of the first end plate 26a to the oil jet 35 of the second end plate 26b via the in-core oil path 45, and the supply oil path 32 of the second end plate 26b to the core Oil can be smoothly circulated through each of the refrigerant distribution paths that reach the oil jet outlet 35 of the first end plate 26a via the inner oil path 45. Therefore, the pipe line resistance in each refrigerant circulation path can be reduced, and energy loss can be reduced.

  In the present embodiment, as described above, the refrigerant flow path from the supply oil path 32 of the first end plate 26a to the oil jet 35 of the second end plate 26b, and the supply oil path 32 of the second end plate 26b. The refrigerant flow path from the first end plate 26a to the oil jet port 35 of the first end plate 26a is substantially mirror-symmetric with respect to a plane imaginary at the axial center of the rotor core 23. Then, as can be understood with reference to FIG. 5, for each of the core oil passages 45 forming a pair among the plurality of core oil passages 45 distributed in the circumferential direction, a pair of core oil passages 45. The distribution direction of the oil that circulates is configured to face each other. In FIG. 5, a pair of in-core oil passages 45 in which the flowing directions of the flowing oil are opposed to each other are surrounded by a two-dot chain line. Thereby, each of the set of oil passages 45 in the core can cool the rotor core 23 uniformly in the axial direction.

  Further, in this example, such a set of four in-core oil passages 45 is arranged in a uniformly distributed manner in the circumferential direction. As a result, the entire rotor core 23 can be uniformly cooled in the axial direction and the circumferential direction, and further, the entire coil end portion 13 at both axial end portions Le can be uniformly cooled. As described above, the rotating electrical machine MG according to the present embodiment is capable of cooling the permanent magnet and the coil end portion uniformly, thereby improving the energy efficiency and stabilizing the performance.

[Second Embodiment]
A second embodiment of the present invention will be described with reference to FIGS. In the present embodiment, the configuration of the refrigerant flow path formed in the end plate 26 provided in the rotor Ro of the rotating electrical machine MG is different from that in the first embodiment. Other configurations are basically the same as those in the first embodiment. Hereinafter, the configuration and cooling structure of the rotating electrical machine MG according to the present embodiment will be described focusing on differences from the first embodiment. Note that points not particularly specified are the same as those in the first embodiment.

  As shown in FIGS. 7 and 8, in the present embodiment, the supply oil passage 32 formed in the end plate 26 exceeds the radial position corresponding to the in-core oil passage 45 in the rotor core 23, and is permanent. It extends in the radial direction to a position where the magnet 25 is disposed (hereinafter referred to as a magnet position). The radially outer end of the supply oil passage 32 is connected to one end of a circumferential oil passage 33a extending in the circumferential direction along the axial end surface of the permanent magnet 25 at the magnet position. At this time, at least a part of the circumferential oil passage 33a overlaps the magnet insertion portion 24 formed of a hollow portion for fixing and holding the permanent magnet 25 when viewed in the axial direction. The other end of the circumferential oil passage 33a is connected to a radial oil passage 33c that extends radially inward. In the present embodiment, the “in-plate refrigerant path” in the present invention is configured by a combination of the circumferential oil path 33a and the radial oil path 33c.

  The radially inner end of the radial oil passage 33c communicates with the first opening 38 that opens on the mounting surface 26t. The end plate 26 is formed with a second opening 39 that opens to the mounting surface 26t. The first opening 38 and the second opening 39 are formed at radial positions corresponding to the in-core oil passage 45 in the rotor core 23. The second opening 39 is connected to the radially inner end of the radial oil passage 33c. The radially outer end of the radial oil passage 33c is connected to one end of the circumferential oil passage 33a. The other end of the circumferential oil passage 33 a is connected to the radially outer end of the return oil passage 34. The radially inner end of the return oil passage 34 is connected to an oil jet 35 formed between the outer peripheral surface 22 o of the rotor shaft 22 and the inner peripheral surface 26 i of the end plate 26.

  In the present embodiment, the supply oil passage 32, the circumferential oil passage 33a, the radial oil passage 33c, and the return oil passage 34 are formed between the mounting surface 26t of the end plate 26 and the axial end surface 23a of the rotor core 23. ing. In this example, as shown in FIG. 6, the supply oil passage 32, the circumferential oil passage 33 a, the radial oil passage 33 c, and the return oil passage 34 are grooves formed by cutting the mounting surface 26 t of the end plate 26. The mounting surface 26t is formed integrally. In the present embodiment, the cross-sectional areas of the groove portions forming the supply oil passage 32, the circumferential oil passage 33a, the radial oil passage 33c, and the return oil passage 34 are substantially the same throughout the groove portions. Further, in the present embodiment, these cross-sectional areas are set so as to be substantially equal to the cross-sectional area of the surface in the core oil passage 45 that is orthogonal to the direction of oil flow.

  In the present embodiment, the first end plate 26a and the second end plate 26b are formed in substantially the same shape except that the positions of the supply oil passage 32 and the oil outlet 35 are interchanged. Then, in a state where the two end plates 26a and 26b are attached to the axial end surface 23a of the rotor core 23, the supply oil passage 32 formed in the first end plate 26a and the oil outlet formed in the second end plate 26b. 35 is configured to communicate with each other. Specifically, the supply oil passage 32 of the first end plate 26a and the oil outlet 35 of the second end plate 26b are a circumferential oil passage 33a, a radial oil passage 33c and a first opening of the first end plate 26a. The part 38, the core oil passage 45, the second opening 39 of the second end plate 26b, the radial oil passage 33c, the circumferential oil passage 33a and the return oil passage 34 communicate with each other. . The relationship between the supply oil passage 32 formed in the second end plate 26b and the oil jet port 35 formed in the first end plate 26a is the same.

  The cooling structure of the rotating electrical machine MG according to this embodiment having the above-described configuration is basically the same as the cooling structure of the rotating electrical machine MG according to the first embodiment. Therefore, even in the rotating electrical machine MG according to the present embodiment, it is possible to sufficiently reduce the initial velocity of the oil ejected from the oil ejection port 35, thereby reducing the kinetic energy brought out by the oil and reducing the energy. Loss is reduced, and the energy efficiency of the entire rotating electrical machine MG is improved.

  In the present embodiment, the oil in the refrigerant flow path (the supply oil path 32, the circumferential oil path 33a, the radial oil path 33c, and the return oil path 34) formed between the rotor core 23 and the end plate 26 is also defined. The cross-sectional area of the surface orthogonal to the flow direction is substantially the same throughout the refrigerant flow path. Further, in the present embodiment, these cross-sectional areas are set so as to be substantially equal to the cross-sectional area of the surface in the core oil passage 45 that is orthogonal to the direction of oil flow. Therefore, the refrigerant flow path from the supply oil path 32 of the first end plate 26a to the oil jet 35 of the second end plate 26b via the in-core oil path 45, and the supply oil path 32 of the second end plate 26b to the core Oil can be smoothly circulated through each of the refrigerant distribution paths that reach the oil jet outlet 35 of the first end plate 26a via the inner oil path 45. Therefore, the pipe line resistance in each refrigerant circulation path can be reduced, and energy loss can be reduced.

  Further, in the present embodiment, a plurality of circumferential oil passages 33 a that communicate with one of the supply oil passage 32 and the oil outlet 35 and extend in the circumferential direction along the permanent magnet 25 at the magnet position are the permanent magnet 25. Are distributed evenly in the circumferential direction. Then, both end portions of each circumferential oil passage 33a are connected to any one of a supply oil passage 32, a radial oil passage 33c, and a return oil passage 34 extending inward in the radial direction when viewed from the circumferential oil passage 33a. ing. Thereby, the oil as a refrigerant | coolant distribute | circulates through the refrigerant | coolant distribution path in the end plate 26, and the whole end plate 26 can be cooled appropriately. When the end plate 26 is cooled, the permanent magnet 25 is cooled by heat conduction between the end plate 26 and the permanent magnet 25 or further through the rotor core 23. In this way, the oil cools the end plate 26, whereby the permanent magnet 25 is indirectly cooled.

  The oil that has flowed into the in-core oil passage 45 in the rotor core 23 through the first opening 38 is radially outside of the in-core oil passage 45 as the rotor Ro rotates while the rotary electric machine MG is driven. It circulates in the axial direction along the inner peripheral surface of the. At that time, the rotor core 23 is cooled by heat conduction between the oil and the electromagnetic steel plates constituting the rotor core 23. When the rotor core 23 is cooled, the permanent magnet 25 is cooled by heat conduction between the electromagnetic steel plate constituting the rotor core 23 and the permanent magnet 25. In this way, the oil cools the rotor core 23, whereby the permanent magnet 25 is indirectly cooled.

  Further, in the present embodiment, as described above, the circumferential oil passage 33a is provided at a position where at least a part thereof overlaps with the magnet insertion portion 24 formed of a hollow portion for fixing and holding the permanent magnet 25 when viewed in the axial direction. It has been. Therefore, a part of the oil flowing through the circumferential oil passage 33 a can flow into the magnet insertion portion 24. Thereby, the oil as a refrigerant | coolant distribute | circulates the inside of the magnet insertion part 24 to an axial direction, and the permanent magnet 25 can be directly cooled by the heat conduction between oil and the permanent magnet 25. FIG.

  Thus, in the present embodiment, both the end plate 26 and the rotor core 23 are cooled, and the permanent magnet 25 is directly cooled, so that the permanent magnet 25 can be cooled more efficiently. Yes. Thus, in the rotary electric machine MG according to the present embodiment, the cooling efficiency is further improved, and as a result, the energy efficiency can be further improved.

[Third embodiment]
A third embodiment of the present invention will be described with reference to FIG. In the present embodiment, the configuration of the refrigerant flow path formed in the end plate 26 provided in the rotor Ro of the rotating electrical machine MG is different from that in the first embodiment. Moreover, it differs from said 1st embodiment by the point by which the oil path 45 in a core is not formed in the rotor core 23. FIG. Other configurations are basically the same as those in the first embodiment. Hereinafter, the configuration and cooling structure of the rotating electrical machine MG according to the present embodiment will be described focusing on differences from the first embodiment. Note that points not particularly specified are the same as those in the first embodiment.

The end plate 26 according to the present embodiment includes a shaft insertion hole 31, an oil supply port 32 a, a supply oil passage 32, a return oil passage 34, and an oil ejection port 35, and these communicate with each other in the single end plate 26. It is configured as follows.
The oil supply port 32a is an opening that opens toward the shaft insertion hole 31 in the radial direction. In the present embodiment, the two oil supply ports 32a are formed to be evenly distributed in the circumferential direction. The oil supply port 32a is provided at a position corresponding to the in-axis supply oil passage 42 formed in the rotor shaft 22 in the axial direction. From each oil supply port 32a, a supply oil passage 32 is formed so as to extend radially outward in the end plate 26. In this example, the supply oil passage 32 extends to a radial position (magnet position) corresponding to the permanent magnet 25 disposed in the rotor core 23. The radially outer end of the supply oil passage 32 is connected to one end of the circumferential oil passage 33a.

  The circumferential oil passage 33a is formed to extend in the circumferential direction along the permanent magnet 25 at the magnet position in the radial direction. In this example, the circumferential oil passage 33a is formed in an arc shape so as to extend in the circumferential direction from one of the two supply oil passages 32 to the other. At this time, at least a part of the circumferential oil passage 33a overlaps the magnet insertion portion 24 formed of a hollow portion for fixing and holding the permanent magnet 25 when viewed in the axial direction. The end of the other side of the circumferential oil passage 33a is on the nearer side in the circumferential direction than the supply oil passage 32 on the other side, and is disposed at a position closest to the supply oil passage 32 on the other side. Is connected to the radially outer end of the return oil passage 34. In the present embodiment, the supply oil passage 32, the circumferential oil passage 33 a, and the return oil passage 34 are formed between the mounting surface 26 t of the end plate 26 and the axial end surface 23 a of the rotor core 23. In this example, although not shown, the supply oil passage 32, the circumferential oil passage 33a, and the return oil passage 34 are integrated with the attachment surface 26t as a groove formed by cutting the attachment surface 26t of the end plate 26. Is formed. In the present embodiment, the cross-sectional areas of the groove portions forming the supply oil passage 32, the circumferential oil passage 33a, and the return oil passage 34 are substantially the same throughout the groove portions. The radially inner end of the return oil passage 34 is connected to an oil jet 35 formed between the outer peripheral surface 22 o of the rotor shaft 22 and the inner peripheral surface 26 i of the end plate 26.

  As described above, in the present embodiment, the refrigerant flow path from the supply oil path 32 to the oil jet 35 is completed within the single end plate 26. In the present embodiment, the oil supply port 32a, the supply oil passage 32, the circumferential oil passage 33a, the return oil passage 34, and the oil jet 35 are respectively referred to as the “refrigerant supply port” and “refrigerant supply passage” in the present invention. ”,“ In-plate refrigerant path ”,“ refrigerant return path ”, and“ refrigerant outlet ”.

In the present embodiment, two end plates 26 having the same shape are attached to the axial end surface 23a of the rotor core 23 on both sides in the axial direction. The cooling structure of the rotating electrical machine MG having such a configuration is as follows.
That is, the oil that has flowed into the supply oil passage 32 circulates radially outward and then circulates in the circumferential oil passage 33a. In that case, the area | region along the permanent magnet 25 of the end plate 26 is cooled because the oil as a refrigerant | coolant distribute | circulates the circumferential direction oil path 33a in the end plate 26. FIG. Thereby, the permanent magnet 25 is cooled by heat conduction between the region of the end plate 26 and the permanent magnet 25 or heat conduction through the rotor core 23. In this way, the oil cools the end plate 26, whereby the permanent magnet 25 is indirectly cooled.

  Further, in the present embodiment, as described above, the circumferential oil passage 33a is provided at a position where at least a part thereof overlaps with the magnet insertion portion 24 formed of a hollow portion for fixing and holding the permanent magnet 25 when viewed in the axial direction. It has been. Therefore, a part of the oil flowing through the circumferential oil passage 33 a can flow into the magnet insertion portion 24. Thereby, the oil as a refrigerant | coolant distribute | circulates the inside of the magnet insertion part 24 to an axial direction, and the permanent magnet 25 can be directly cooled by the heat conduction between oil and the permanent magnet 25. FIG.

  The oil that has cooled the end plate 26 and the permanent magnet 25 while flowing through the circumferential oil passage 33a flows through the return oil passage 34 toward the inside in the radial direction. Thereafter, the oil reaches the oil ejection port 35 and is ejected from the oil ejection port 35 toward the coil end portion 13. Then, the oil reaches the coil end portion 13 of the stator St disposed on the outer side in the radial direction of the rotor 23, and the coil end portion 13 is cooled by heat conduction between the oil and the conductor constituting the coil end portion 13. The

  As described above, also in the present embodiment, the oil ejection port 35 is formed between the outer peripheral surface 22 o of the rotor shaft 22 and the inner peripheral surface 26 i of the end plate 26. Therefore, even in the rotating electrical machine MG according to the present embodiment, the initial speed of the oil ejected from the oil ejection port 35 can be sufficiently reduced, and the kinetic energy taken out by the oil is reduced to reduce the energy loss. However, the energy efficiency of the entire rotating electrical machine MG is improved. Moreover, the cooling efficiency of the coil end part 13 is improved.

  Further, in the present embodiment, a surface orthogonal to the oil flow direction in the refrigerant flow path (the supply oil path 32, the circumferential oil path 33a, and the return oil path 34) formed between the rotor core 23 and the end plate 26. Is substantially the same throughout the refrigerant flow path. Therefore, oil can be smoothly circulated in these oil passages. Therefore, the energy efficiency of the rotating electrical machine MG as a whole is improved by reducing the energy loss by reducing the pipe resistance in the refrigerant flow path.

[Fourth embodiment]
A fourth embodiment of the present invention will be described with reference to FIG. In the present embodiment, the configuration of the refrigerant flow path formed in the end plate 26 provided in the rotor Ro of the rotating electrical machine MG is different from that in the third embodiment. Other configurations are basically the same as those in the third embodiment. Hereinafter, the configuration and the cooling structure of the rotating electrical machine MG according to the present embodiment will be described focusing on differences from the third embodiment. Note that points not particularly specified are the same as in the third embodiment.

  The end plate 26 according to the present embodiment has a refrigerant flow path meandering in the circumferential direction formed therein. In order to form such a meandering refrigerant flow path, the end plate 26 according to the present embodiment includes a first circumferential oil path 33a and a second circumferential oil path 33b as oil paths constituting the in-plate refrigerant path. It has. Here, the first circumferential oil passage 33a is an oil passage extending in the circumferential direction at a radial position (magnet position) corresponding to the permanent magnet 25 disposed in the rotor core 23. In the third embodiment, “ This is an oil passage corresponding to the “circumferential oil passage 33a”. The second circumferential oil passage 33b is an oil passage that extends radially inward from the magnet position in the circumferential direction.

  The first circumferential oil passage 33a connected to the radially outer end of the supply oil passage 32 is formed in an arc shape so as to extend in the circumferential direction along the permanent magnet 25 at the magnet position in the radial direction. . In this example, a first circumferential oil passage 33a extending in the circumferential direction is formed along each of the pair of permanent magnets 25 fixed in a V shape. At this time, at least a part of each first circumferential oil passage 33a overlaps with the magnet insertion portion 24 formed of a cavity for fixing and holding the permanent magnet 25 when viewed from the axial direction. In addition, the second circumferential oil passage 33b has a radial position that is radially outside the inner circumferential surface 26i of the end plate 26 (around the shaft insertion hole 31) and relatively close to the shaft insertion hole 31 in the circumferential direction. It is formed to extend. Then, the other end of the first circumferential oil passage 33a and the one end of the second circumferential oil passage 33b, and the other end of the second circumferential oil passage 33b and the first circumferential oil. One end of the path 33a is sequentially connected by a radial oil path 33c to form a refrigerant flow path meandering in the circumferential direction.

  The other end portion of the first circumferential oil passage 33 a that is located farthest from the supply oil passage 32 in the circumferential direction is connected to the radially outer end portion of the return oil passage 34. In the present embodiment, the supply oil passage 32, the first circumferential oil passage 33 a, the second circumferential oil passage 33 b, the radial oil passage 33 c, and the return oil passage 34 are connected to the mounting surface 26 t of the end plate 26 and the rotor core 23. It is formed between the axial end surface 23a. In this example, although not shown, the supply oil passage 32, the first circumferential oil passage 33a, the second circumferential oil passage 33b, the radial oil passage 33c, and the return oil passage 34 are attached to the mounting surface 26t of the end plate 26. As a groove formed by cutting, the mounting surface 26t is formed integrally. In the present embodiment, the cross-sectional area of the groove portions forming the supply oil passage 32, the first circumferential oil passage 33a, the second circumferential oil passage 33b, the radial oil passage 33c, and the return oil passage 34 is the whole of these groove portions. It is made substantially the same throughout. The radially inner end of the return oil passage 34 is connected to an oil jet 35 formed between the outer peripheral surface 22 o of the rotor shaft 22 and the inner peripheral surface 26 i of the end plate 26.

  The cooling structure of the rotating electrical machine MG according to this embodiment having the above-described configuration is basically the same as the cooling structure of the rotating electrical machine MG according to the third embodiment. Therefore, also in the rotary electric machine MG according to the present embodiment, the permanent magnet 25 is indirectly cooled by cooling the end plate 26. Further, the permanent magnet 25 is directly cooled by the oil flowing in the magnet insertion portion 24 in the axial direction. However, in the present embodiment, since the refrigerant circulation path meandering in the circumferential direction is formed by the first circumferential oil path 33a, the second circumferential oil path 33b, and the radial oil path 33c, the third implementation. Compared with the configuration, the entire end plate 26 can be cooled more efficiently.

  As described above, also in the present embodiment, the oil ejection port 35 is formed between the outer peripheral surface 22 o of the rotor shaft 22 and the inner peripheral surface 26 i of the end plate 26. Therefore, even in the rotating electrical machine MG according to the present embodiment, the initial speed of the oil ejected from the oil ejection port 35 can be sufficiently reduced, and the kinetic energy taken out by the oil is reduced to reduce the energy loss. However, the energy efficiency of the entire rotating electrical machine MG is improved. Moreover, the cooling efficiency of the coil end part 13 is improved.

  Further, in the present embodiment, a refrigerant flow path (a supply oil path 32, a first circumferential oil path 33a, a second circumferential oil path 33b, a radial oil path) formed between the rotor core 23 and the end plate 26. 33c and the return oil passage 34), the cross-sectional area of the surface orthogonal to the oil circulation direction is substantially the same throughout the refrigerant circulation route. Therefore, oil can be smoothly circulated in these oil passages. Therefore, the energy efficiency of the rotating electrical machine MG as a whole is improved by reducing the energy loss by reducing the pipe resistance in the refrigerant flow path.

[Other Embodiments]
(1) In each of the embodiments described above, a case where the refrigerant flow path is formed in the end plate 26 attached to the axial end surface 23a of the rotor core 23 of the rotor Ro, and the oil outlet 35 is provided in the end plate 26. Described as an example. However, the embodiment of the present invention is not limited to this. That is, for example, when the rotor Ro including the in-core oil passage 45 does not include the end plate 26, the return oil passage 34 and the oil outlet 35 may be formed in the rotor core 23 at both axial end portions Le. This is one of the preferred embodiments of the present invention.

(2) In each of the embodiments described above, the case where the oil jet 35 is formed between the outer peripheral surface 22o of the rotor shaft 22 and the inner peripheral surface 26i of the end plate 26 has been described as an example. However, the embodiment of the present invention is not limited to this. That is, in the radial direction, the position closer to the rotor shaft 22 than the outer diameter end of the rotor Ro, and when the rotor Ro includes the core inner oil passage 45, the radial position corresponding to the core inner oil passage 45 is provided. In another preferred embodiment of the present invention, the oil jet port 35 is formed at a position radially inward of the oil jet port 35. Even in the configuration in which the oil ejection port 35 is formed at such a position, compared to a case where oil is ejected from the radial direction position corresponding to at least the permanent magnet 25 or the oil passage 45 in the core toward the coil end portion 13. Thus, the initial speed when the oil is ejected can be reduced, so that the kinetic energy taken out by the oil can be reduced to reduce the energy loss, and the energy efficiency of the entire rotating electrical machine MG can be improved. Moreover, the cooling efficiency of the coil end part 13 can be improved.

(3) In each of the above embodiments, as an example, the supply oil passage 32 and the return oil passage 34 are formed between the attachment surface 26t of the end plate 26 and the axial end surface 23a of the rotor core 23. explained. Accordingly, in the first and second embodiments, the end portion of the supply oil passage 32 (or the communication oil passage 37) formed as described above is used as the first opening portion 38, and the feedback is performed. The case where the radially outer end of the oil passage 34 is the second opening 39 has been described as an example. However, the embodiment of the present invention is not limited to this. That is, for example, a configuration in which the supply oil passage 32 and the return oil passage 34 are formed inside the end plate 26 is also one preferred embodiment of the present invention.
In this case, in the first and second embodiments, from the end portion of the supply oil passage 32 (or the communication oil passage 37) formed as described above and the end portion on the radially outer side of the return oil passage 34. The first opening 38 and the second opening 39 are preferably formed as openings that extend in the axial direction in the end plate 26 and open to the attachment surface 26t.

(4) In the first and second embodiments described above, both the supply oil passage 32 and the oil outlet 35 are provided in both the first end plate 26a and the second end plate 26b, and the first end plate 26a. The refrigerant flow path from the supply oil path 32 to the oil jet outlet 35 of the second end plate 26b, and the refrigerant flow path from the supply oil path 32 of the second end plate 26b to the oil jet outlet 35 of the first end plate 26a The case where it is formed has been described as an example. However, the embodiment of the present invention is not limited to this. That is, the supply oil passage 32 is provided in one of the first end plate 26a and the second end plate 26b, and the oil jet port 35 is provided in the other of the first end plate 26a and the second end plate 26b. This is also a preferred embodiment of the present invention. In this case, the oil flowing through the in-core oil passage 45 flows in one direction from one of the first end plate 26a and the second end plate 26b toward the other of the first end plate 26a and the second end plate 26b. It becomes the composition which distributes.

(5) In the third embodiment, the circumferential oil passage 33 a has an arc shape so as to connect the radially outer end of the supply oil passage 32 and the radially outer end of the return oil passage 34. The case where it is formed as an example has been described. However, the embodiment of the present invention is not limited to this. In other words, the permanent magnet 25 may be formed so as to extend along the circumferentially distributed permanent magnets 25 so that the permanent magnets 25 can be cooled at the magnet position. For example, the circumferential oil passage 33a has a polygonal line shape. One preferred embodiment of the present invention is to connect the radially outer end of the supply oil passage 32 and the radially outer end of the return oil passage 34 while forming the oil passage. It is.

(6) In the fourth embodiment, the first circumferential oil passage 33a is disposed between the radially outer end of the supply oil passage 32 and the radially outer end of the radial oil passage 33c. A connection is made between the radially outer ends of two adjacent radial oil passages 33c and between the radially outer end of the radial oil passage 33c and the radially outer end of the return oil passage 34. Thus, the case where it is formed in an arc shape has been described as an example. However, the embodiment of the present invention is not limited to this. That is, it is also one of the preferred embodiments of the present invention that the first circumferential oil passage 33a is formed as, for example, a linear oil passage. The same applies to the second circumferential oil passage 33b.

  The present invention relates to a rotating electrical machine including a rotor that is rotatably supported around a rotor axis on the radially inner side of a stator having a coil end portion, and in which a plurality of permanent magnets are arranged in the circumferential direction, and so on. It can utilize suitably for the end plate for rotary electric machines used for a simple rotary electric machine.

13 Coil end portion 22 Rotor shaft 23 Rotor core 25 Permanent magnet 26a First end plate 26b Second end plate 31 Shaft insertion hole 32 Oil supply passage (refrigerant supply passage)
32a Oil supply port (refrigerant supply port)
33a First circumferential oil passage (first circumferential refrigerant passage, in-plate refrigerant passage)
33b Second circumferential oil passage (second circumferential refrigerant passage, in-plate refrigerant passage)
33c Radial oil passage (in-plate refrigerant passage)
34 Return oil path (refrigerant return path)
35 Oil outlet (refrigerant outlet)
38 1st opening part 39 2nd opening part 41 Shaft oil path (shaft refrigerant path)
45 Oil passage in the core (refrigerant passage in the core)
MG1 first rotating electrical machine MG2 second rotating electrical machine St1 first stator St2 second stator Ro1 first rotor Ro2 second stator

Claims (10)

A rotor having a plurality of permanent magnets disposed in the circumferential direction and supported rotatably around the rotor axis on the radially inner side of the stator having a coil end portion,
A rotating electrical machine having a structure in which the permanent magnet and the coil end portion are cooled by a refrigerant supplied from a rotor shaft,
A refrigerant return path through which the refrigerant after cooling the permanent magnet circulates radially inside the rotor;
A refrigerant outlet that communicates with the radially inner end of the refrigerant return path and that is provided at a position close to the rotor shaft in the radial direction and from which the refrigerant is ejected toward the coil end portion; ,
Rotating electric machine with In the rotor, a refrigerant flow path including the refrigerant return path is formed, in which the refrigerant supplied from the rotor shaft flows in one direction toward the refrigerant outlet,
2. The rotating electrical machine according to claim 1, wherein a cross-sectional area of a surface orthogonal to the refrigerant flow direction in the refrigerant flow path is substantially the same throughout the refrigerant flow path. The rotor has a substantially cylindrical rotor core that is fixed to the rotor shaft and holds the permanent magnet, and a shaft insertion hole through which the rotor shaft is inserted radially inward, and is attached to an axial end surface of the rotor core. An end plate,
The end plate is provided with a refrigerant supply path that opens to the shaft insertion hole side and communicates with an in-axis refrigerant path that is provided on the rotor shaft, and the refrigerant outlet.
3. The rotating electrical machine according to claim 1, wherein the coolant jet port communicates with the coolant supply path and opens in an axial direction on a side opposite to the rotor core.   The rotating electrical machine according to claim 3, wherein the refrigerant outlet is formed between an outer peripheral surface of the rotor shaft and an inner peripheral surface of the end plate. The refrigerant supply path is configured to extend in the radial direction in the end plate to a magnet position that is a position in which the permanent magnet is disposed in the radial direction.
The in-plate refrigerant path which is extended in the circumferential direction at least along the axial direction end surface of the said permanent magnet, and is connected to the said refrigerant | coolant return path is further provided in the said end plate while connecting with the said refrigerant | coolant supply path. Or the rotary electric machine of 4.   The in-plate refrigerant path includes a first circumferential refrigerant path extending in the circumferential direction in the magnet position in the radial direction, and a second circumferential refrigerant path extending in the radial direction radially inward from the magnet position, The rotating electrical machine according to claim 5, wherein a refrigerant flow path meandering in the circumferential direction is formed. As the end plate, a first end plate and a second end plate are provided,
The rotor further includes a plurality of in-core refrigerant paths distributed in the circumferential direction and extending in the axial direction in the rotor core,
The in-core refrigerant path communicates with the refrigerant supply path provided in the first end plate on one axial side, and communicates with the refrigerant outlet provided on the second end plate on the other axial side. The rotating electrical machine according to any one of claims 3 to 6. Of each of the plurality of in-core refrigerant paths, a pair of the in-core refrigerant paths,
The rotating electrical machine according to claim 7, wherein flow directions of the refrigerant flowing in the axial direction through the pair of in-core refrigerant paths are opposed to each other. An end plate for a rotating electrical machine having a substantially disk shape that is attached to an axial end surface of a rotor core constituting a rotor of the rotating electrical machine,
A shaft insertion hole provided on the radially inner side, through which the rotation shaft of the rotor is inserted;
A refrigerant supply port that opens in the radial direction toward the shaft insertion hole;
A refrigerant return path extending in a radial direction;
A refrigerant outlet that opens in the axial direction on the opposite side to the side attached to the rotor core, communicates with the radially inner end of the refrigerant return path, and is provided close to the shaft insertion hole in the radial direction When,
A refrigerant flow path communicating the refrigerant supply port and the refrigerant return path;
An end plate for rotating electrical machines. An end plate for a rotating electrical machine having a substantially disk shape that is attached to an axial end surface of a rotor core constituting a rotor of the rotating electrical machine,
A shaft insertion hole provided on the radially inner side, through which the rotation shaft of the rotor is inserted;
A refrigerant supply port that opens in the radial direction toward the shaft insertion hole;
A refrigerant return path extending in a radial direction;
A first opening and a second opening that open to an attachment side, which is the side attached to the rotor core in the axial direction;
A refrigerant outlet that opens in the axial direction on the opposite side of the mounting side, communicates with the radially inner end of the refrigerant return path, and is provided in the radial direction and close to the shaft insertion hole;
A refrigerant flow path that connects the refrigerant supply port and the first opening, and the second opening and the refrigerant return path, respectively;
An end plate for rotating electrical machines.

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