WO2015025648A1

WO2015025648A1 - Dynamo-electric machine

Info

Publication number: WO2015025648A1
Application number: PCT/JP2014/069057
Authority: WO
Inventors: 泰也古田
Original assignee: アイシン・エィ・ダブリュ株式会社
Priority date: 2013-08-21
Filing date: 2014-07-17
Publication date: 2015-02-26

Abstract

At least one end plate (7) is provided with a circular ring oil passage (70) which is formed in a side surface of the at least one end plate (7), the side surface facing end surfaces (6a) of permanent magnets (6). The circular ring oil passage (70) allows cooling oil, which has been supplied from the inner peripheral side, to circumferentially circulate through the circular ring oil passage (70) and makes the cooling oil in contact with all the exposed end surfaces (6a) of the permanent magnets (6) to thereby cool the permanent magnets (6). A rotor core (5) is provided with: grooves (52) which are axially formed in the outer peripheral surface (5a) thereof and which are arranged between the permanent magnets (6); and blocking sections (51a) which are formed in the endmost steel plate (51) among steel plates (50, 51), the endmost steel plate (51) being adjacent to at least the circular ring oil passage (70), and which block the connection between the grooves (52) and the circular ring oil passage (70). The circular ring oil passage (70) can efficiently cool the entire rotor (3), and the blocking sections (51a) can prevent the cooling oil in the circular ring oil passage (70) from being discharged to the grooves (52) by centrifugal force, etc.

Description

Rotating electric machine

This technology relates to a rotating electrical machine suitable for mounting on, for example, a hybrid vehicle or an electric vehicle, and more particularly to a rotating electrical machine having a built-in rotor and a cooling device for cooling a stator.

In recent years, in order to improve vehicle fuel efficiency and environmental performance, for example, a vehicle drive equipped with a rotating electrical machine such as a hybrid drive device or an electric vehicle drive device, that is, a motor generator (hereinafter simply referred to as “motor”). Various devices have been proposed.

As an example of such a motor, there is a so-called IPM motor in which a magnet is embedded in a rotor. In an IPM motor mounted on a vehicle drive device, a cooling device for cooling these is provided in order to suppress heat generation of the rotor and stator due to driving. As this cooling device, for example, a cooling device having a cooling oil passage formed in an annular shape on the inner side in the axial direction of an end plate that sandwiches both ends of a plurality of laminated steel plates provided in a rotor is known. (See Patent Document 1). According to this cooling device, the annular flow path formed in the inner portion of the end plate is formed from the inner peripheral side to the outer peripheral side, and the cooling oil is supplied from the inner peripheral side of the rotor shaft to the oil path of the end plate. Is supplied, and the laminated steel plate and magnet that are in contact with the cooling oil are cooled, and finally the entire rotor is cooled.

JP 2009-27837 A

However, in the motor of Patent Document 1, since the annular oil passage is formed over the outer peripheral side of the inner side of the end plate, the magnet adjacent to the outer peripheral surface of the rotor core, for example, to suppress torque ripple of the motor When forming a groove as a magnetic barrier that separates the magnetic flux lines from each other or a groove for reducing the weight of the rotor core, the groove and the outer peripheral side of the annular oil passage communicate with each other, Cooling oil may be discharged from the annular oil passage into the groove. In this case, there is a problem that a large amount of cooling oil enters between the rotor core and the stator core, and the rotor drags the cooling oil due to rotation and increases the rotation loss.

Therefore, there is provided a rotating electrical machine having an annular oil passage for cooling oil on the inner side of the end plate and capable of suppressing cooling oil from being discharged from the annular oil passage to the groove even if a groove is formed on the outer peripheral portion of the rotor core. It is intended to provide.

The rotating electrical machine (1) (see, for example, FIGS. 1 to 3), a rotor support member (2),
A rotor core (5) having an annular core plate (50, 51) whose inner peripheral portion is fixedly supported by the rotor support member (2) and stacked in the axial direction, and the rotor core (5) in the axial direction. The rotor core (5) is sandwiched between the rotor support member (2) and a plurality of magnets (6) that pass through and expose end faces (6a) at at least one end in the axial direction of the rotor core (5). ) In the axial direction, and a rotor (3) having a pair of end plates (7);
In a rotating electrical machine (1) comprising: a stator (4) having an annular stator core (8) disposed on an outer peripheral side of the rotor core (5);
At least one of the end plates (7) circulates cooling oil supplied from an inner peripheral side in a circumferential direction on a side surface facing the end surface (6a) of the magnet (6), so that the plurality of magnets ( An annular oil passage (70) for cooling the magnet (6) in contact with all of the exposed end face (6a) of 6),
The rotor core (5) is formed on the outer peripheral surface (5a) in the axial direction, and includes a groove (52) disposed between the plurality of magnets (6) and the core plate (50, 51). A shielding portion (51a) that is formed on at least the core plate (51) adjacent to the annular oil passage (70) and shields the communication between the groove (52) and the annular oil passage (70). , Provided.

As a result, the annular oil passage formed in the end plate circulates the cooling oil in the circumferential direction to contact all of the end faces of the plurality of magnets and cools the magnet that is the heat generation source. By reducing the number of magnets that are not cooled, the entire rotor can be efficiently cooled. That is, the annular oil passage has an annular shape and can contact the end faces of all the exposed magnets. For example, the L-shaped oil passage cannot contact some of the end faces of the plurality of magnets. Compared to the case, the cooling efficiency of the rotor can be improved.

Moreover, since the groove | channel arrange | positioned between the magnets is provided in the outer peripheral surface of the rotor core, the magnetic flux line between adjacent magnets is interrupted | blocked, and while being able to reduce the torque ripple of a motor, on the outer peripheral surface of a rotor core Since the groove | channel arrange | positioned between the magnets is provided, the weight reduction of a rotor core can be achieved. In addition, since at least the core plate adjacent to the annular oil passage is provided with a shielding portion that shields the communication between the groove and the annular oil passage, the cooling oil of the annular oil passage is formed in the groove by centrifugal force or the like. It can prevent being discharged.

In addition, although the code | symbol in the said parenthesis is for contrast with drawing, this is for convenience for making an understanding of an invention easy, and has an influence on the structure of a claim. is not.

It is the schematic which shows the rotary electric machine which concerns on embodiment, (a) is sectional drawing of an upper half, (b) is a front view of an end plate. It is sectional drawing of the partially expanded rotor and rotor shaft of the rotary electric machine which concerns on embodiment. It is a partially omitted front view showing a steel plate of a rotating electrical machine according to the embodiment, (a) is a steel plate other than the endmost steel plate, and (b) is the endmost steel plate.

Hereinafter, the structure of the rotating electrical machine according to the present embodiment will be described with reference to FIGS. 1 to 3. In addition, the rotary electric machine in this Embodiment shall be mounted in drive devices, such as a hybrid vehicle and an electric vehicle, for example.

As shown in FIG. 1A, a motor 1 as a rotating electrical machine includes a rotor shaft (rotor support member) 2 that is rotatably supported with respect to a case (not shown) of a drive device, a rotor 3, and a stator. 4. In the present embodiment, the motor 1 is a so-called IPM motor in which a permanent magnet 6 (described later) is embedded in the rotor 3.

The rotor shaft 2 has a hollow tube shape in the present embodiment, and is rotatably supported by a ball bearing or the like supported by the case. The rotor shaft 2 is configured to fix and support a rotor 3 described later from the inner peripheral side. Further, a stopper portion 20 whose diameter is increased in a flange shape is formed on the outer peripheral side of the rotor shaft 2, and a rotor 3 described later is in contact with the shaft in the axial direction. In FIG. 1A, only the upper side of the cross section of the rotor shaft 2 is shown.

The rotor 3 includes a substantially cylindrical rotor core 5, a plurality of permanent magnets (magnets) 6 that penetrate the rotor core 5 in the axial direction, and a pair of end plates 7 that are provided and sandwiched on both sides of the rotor core 5 in the axial direction. 7a, 7b). The rotor core 5 is supported by an inner peripheral portion fixed to the outer peripheral portion of the rotor shaft 2, and as shown in FIG. 2, a steel plate (core plate) 50, which is a plurality of annular magnetic bodies stacked in the axial direction. 51.

As shown in FIG. 1A, the permanent magnet 6 is embedded through the rotor core 5 in the axial direction, and the end face 6 a is exposed at at least one end of the rotor core 5 in the axial direction. In the present embodiment, the permanent magnet 6 has both end faces 6 a exposed at both ends of the rotor core 5 in the axial direction. As shown in FIG. 3, the permanent magnet 6 has a flat plate shape and is arranged such that the longitudinal direction coincides with the axial direction and the thickness direction coincides with the radial direction. Spaces 53 are provided on both sides of the permanent magnet 6 in the circumferential direction. The space 53 can block the magnetic flux lines to the adjacent permanent magnet 6 and reduce the cogging torque and torque ripple of the motor 1.

As shown in FIGS. 2 and 3, a groove 52 is formed in the axial direction and disposed between the permanent magnets 6 on the outer peripheral surface 5 a of the rotor core 5. In the present embodiment, each groove 52 is a single linear groove.

The groove 52 functions as a magnetic barrier that blocks the magnetic flux lines between the adjacent permanent magnets 6, thereby reducing the torque ripple of the motor 1. Moreover, since the groove | channel 52 is groove shape, the weight reduction of the rotor core 5 can be achieved compared with the case where the groove | channel 52 is not provided. In the present embodiment, the groove 52 has two functions of reducing the weight of the magnetic barrier and the rotor core 5. However, the present invention is not limited to this. For example, the groove 52 does not function as a magnetic barrier. It may be possible to reduce only the weight.

Each end plate 7 (7a, 7b) has a disc shape and is sandwiched by the rotor shaft 2 so that the rotor core 5 is sandwiched in the axial direction. Each end plate 7 (7a, 7b) has an annular oil passage 70 to be described later on the inner surface facing the rotor core 5. In addition, each

end plate

7a, 7b in Fig.1 (a) can be made into the same shape. Further, the right end plate 7a in FIG. 1 (a) shows a state cut along the line RR in FIG. 1 (b), and the left end plate 7b in FIG. A state cut by the LL line in 1 (b) is shown.

One end plate 7a is disposed so as to abut against the stopper portion 20 of the rotor shaft 2. The other end plate 7 b is pressed and fixed in the direction of the stopper portion 20 by the stopper 10. Accordingly, each end plate 7 sandwiches the rotor core 5, and the entire rotor 3 rotates integrally with the rotor shaft 2. The stopper 10 has a disk shape and is fixed to the rotor shaft 2 by, for example, fitting, welding, screwing or the like.

The stator 4 includes an annular stator core 8 disposed on the outer peripheral side of the rotor core 5 and fixed to the case, and a stator coil 9 wound around the stator core 8. The stator core 8 is composed of a plurality of annular steel plates 80 that are laminated in the axial direction, and is fastened to the case by bolts (not shown). The stator coil 9 is embedded in the stator core 8, and coil ends 90 protruding from the stator core 8 are formed on both sides in the axial direction of the stator core 8 in order to fold the stator coil 9. Note that the length of each end portion in the axial direction of the stator core 8 is shorter than that of the rotor core 5 by two to three steel plates 80. That is, the axial length of the rotor core 5 is longer than the axial length of the stator core 8.

Next, the configuration of the end plate 7 and the adjacent endmost steel plate 51, which are the features of the present embodiment, will be described in detail.

The end plate 7 is provided with a circular oil passage 70 on the inner surface as shown in FIGS. The annular oil passage 70 is an annular oil passage formed on the side surface facing the end surface 6 a of the permanent magnet 6, that is, the inner side surface, and the cooling oil supplied from the rotor shaft 2 disposed on the inner peripheral side. Is circulated in the circumferential direction so as to contact all of the exposed end faces 6a of the plurality of permanent magnets 6 to cool the permanent magnets 6.

Further, the end plate 7 introduces cooling oil supplied from the rotor shaft 2 on the inner peripheral side into the annular oil passage 70 and discharges the cooling oil circulating in the annular oil passage 70 in the axial direction. And a discharge hole 72.

The introduction hole 71 is formed by communicating the inner peripheral surface of the annular oil passage 70 and the inner peripheral surface of the end plate 7 in the radial direction. A communication hole 21 that communicates the inside and the outside of the rotor shaft 2 in the radial direction is formed at a position facing the introduction hole 71 of the rotor shaft 2. The discharge hole 72 is formed by communicating the side surface of the annular oil passage 70 and the outer surface of the end plate 7 in the axial direction. The formation position of the discharge hole 72 is, for example, an intermediate portion in the radial direction of the annular oil passage 70. The cooling oil flowing through the inside of the rotor shaft 2 by these introduction holes 71, the annular oil passage 70, and the discharge holes 72 is discharged from the communication holes 21 by, for example, centrifugal force, passes through the introduction holes 71, and is circular. After being introduced into the circulating oil passage 70 and circulated, it is discharged from the discharge hole 72.

As shown in FIG. 1B, the introduction hole 71 and the discharge hole 72 are each formed in a circumferential direction by four every 90 °. The introduction hole 71 and the discharge hole 72 are arranged so that the phases with respect to the circumferential direction are different by 45 °, for example. As a result, the cooling oil introduced from the introduction hole 71 is prevented from being immediately discharged from the discharge hole 72 by centrifugal force, as in the case where the introduction hole 71 and the discharge hole 72 are arranged in the same phase. Then, the permanent magnet 6 can be efficiently cooled by sufficiently circulating the cooling oil in the annular oil passage 70.

As shown in FIGS. 2 and 3, a steel plate 51 (hereinafter referred to as the endmost steel plate) 51 adjacent to the annular oil passage 70 of the

steel plates

50 and 51 constituting the rotor core 5 has a groove 52 and an annular ring. A shielding part 51 a that shields communication with the oil passage 70 is provided. The shielding part 51 a is formed in the groove 52 portion of the outermost steel plate 51, and by blocking the groove 52, the communication between the groove 52 of the other steel plate 50 and the annular oil passage 70 is shielded. Yes. Thereby, it is possible to prevent the cooling oil inside the annular oil passage 70 from being discharged into the groove 52 due to centrifugal force or the like.

Furthermore, a discharge part 51b that can discharge the cooling oil stored in the groove 52 in the axial direction from the groove 52 is provided on the outer peripheral side of the shielding part 51a. The discharge part 51b makes it possible to discharge the cooling oil inside the groove 52 in the axial direction by forming the outer peripheral side of the shielding part 51a of the outermost steel plate 51 lower than the outer peripheral surface 5a of the rotor core 5.

The operation of the motor 1 described above will be described focusing on the flow of cooling oil. In FIGS. 1 and 2, the flow of the cooling oil is indicated by arrows.

When the stator 3 of the motor 1 is energized and the rotor 3 rotates, as shown in FIGS. 1 and 2, the cooling oil inside the rotor shaft 2 is discharged from the communication hole 21 to the outer peripheral side by centrifugal force. Since the communication hole 21 faces the introduction hole 71 of the end plate 7, the discharged cooling oil is introduced into the introduction hole 71 and introduced into the annular oil passage 70 from the introduction hole 71.

In the annular oil passage 70, the cooling oil circulates with the rotation of the rotor 3, circulates behind the rotation speed of the rotor 3 when the rotor 3 accelerates, and circulates faster than the rotation speed of the rotor 3 when the rotor 3 decelerates. The cooling oil contacts the end face 6a of the permanent magnet 6 during circulation, thereby cooling the permanent magnet 6 that is a heat generation source, and in addition, the outermost steel plate 51 is provided at a portion where the annular oil passage 70 faces. Since it cools, the whole rotor 3 can be cooled efficiently. In particular, the annular oil passage 70 has an annular shape and can contact the end faces 6a of all the permanent magnets 6, so that all the permanent magnets 6 can be cooled. For example, an L-shaped oil passage can be used. The cooling efficiency can be improved as compared with the case where a part of the plurality of permanent magnets 6 cannot be cooled.

And the cooling oil circulating through the annular oil passage 70 is prevented from being discharged into the groove 52 by the shielding part 51 a of the outermost steel plate 51. Thereby, since it is possible to suppress a large amount of cooling oil from entering between the rotor core 5 and the stator core 8, it is possible to prevent the rotor 3 from dragging the cooling oil by rotation and increasing rotation loss. Here, when the end plate 7 is applied instead of the outermost steel plate 51 as a member for shielding the annular oil passage 70 and the groove 52, the circumferential width of the annular oil passage 70 is not constant, and the cooling oil Distribution will worsen. That is, since the grooves 52 are formed between the permanent magnets 6, in order to shield each groove 52, a shielding portion that protrudes inside the annular oil passage 70 must be provided at a portion corresponding to each groove 52. Don't be. Thus, by providing a large number of protruding shielding portions on the inner peripheral surface of the annular oil passage 70, smooth circulation of the cooling oil is hindered and cooling efficiency is reduced. On the other hand, in the motor 1 of the present embodiment, since the shield part 51a to the groove 52 is formed using the endmost steel plate 51, the annular oil passage 70 does not have a portion protruding inward. It becomes a ring shape, and the shielding part 51a does not hinder the smooth circulation of the cooling oil in the annular oil passage 70, so that the cooling efficiency can be improved.

A part of the cooling oil circulating in the annular oil passage 70 is pushed out and discharged from a discharge hole 72 arranged in a phase different from that of the communication hole 21. Since the discharged cooling oil is subjected to centrifugal force, it is sprayed to the outer peripheral side and sprayed to the coil end 90. Thereby, the coil end 90 is cooled and the whole stator 4 can be cooled.

Further, for example, when the lower part of the rotor 3 is immersed in the cooling oil, and the rotor 3 rakes up the cooling oil by rotation or the like and the cooling oil enters the groove 52, the cooling oil inside the groove 52 Is discharged from the discharge portion 51b of the outermost steel plate 51 based on the centrifugal force. Here, when the outermost steel plate 51 does not have the discharge part 51 b, the cooling oil that has entered the groove 52 enters between the rotor core 5 and the stator core 8, thereby increasing the rotational resistance of the rotor 3. There is sex. On the other hand, in the present embodiment, the cooling oil that has entered the groove 52 is discharged from the discharge portion 51b before entering the air gap between the rotor core 5 and the stator core 8, so that the rotation loss of the rotor 3 increases. Can be suppressed.

As described above, according to the motor 1 of the present embodiment, the annular oil passage 70 formed in the end plate 7 circulates the cooling oil in the circumferential direction so that all of the end faces 6a of the plurality of permanent magnets 6 are present. Since the permanent magnet 6 that is a heat generation source is cooled by being brought into contact with each other, the whole of the rotor 3 can be efficiently cooled by reducing the number of permanent magnets 6 that are not cooled without being in contact with the cooling oil. In other words, the annular oil passage 70 has an annular shape and can contact the exposed end faces 6a of all the permanent magnets 6. For example, an L-shaped independent oil passage is used to form the plurality of permanent magnets 6. The cooling efficiency of the rotor 3 can be improved as compared with the case where a part of the end face 6a cannot be contacted.

Further, according to the motor 1 of the present embodiment, the outermost steel plate 51 adjacent to the annular oil passage 70 is provided with the shielding portion 51 a that shields the communication between the groove 52 and the annular oil passage 70. Therefore, it is possible to prevent the cooling oil in the annular oil passage 70 from being discharged into the groove 52 due to centrifugal force or the like. Thereby, it is possible to prevent a large amount of cooling oil from entering between the rotor core 5 and the stator core 8, and to prevent the rotor 3 from dragging the cooling oil by rotation and increasing rotation loss.

Further, in the motor 1 of the present embodiment, the outermost steel plate 51 having the shielding part 51a includes the discharge part 51b that can discharge the cooling oil stored in the groove 52 from the groove 52 in the axial direction. Thereby, for example, when the lower part of the rotor 3 is immersed in the cooling oil and the cooling oil enters the groove 52 due to the rotor 3 being swung up by rotation, the cooling oil inside the groove 52 is discharged. 51b can be discharged in the axial direction. As a result, it is possible to suppress the cooling oil from entering the air gap between the rotor 3 and the stator 4 and increasing the rotation loss.

Further, in the motor 1 of the present embodiment, at least one end plate 7 circulates through the annular oil passage 70 and the introduction hole 71 for introducing the cooling oil supplied from the inner peripheral side into the annular oil passage 70. A discharge hole 72 for discharging the cooling oil in the axial direction, and the introduction hole 71 and the discharge hole 72 are arranged with different phases in the circumferential direction. Thereby, for example, the cooling oil introduced from the introduction hole 71 is immediately discharged from the discharge hole 72 by the centrifugal force as in the case where the introduction hole 71 and the discharge hole 72 are arranged in the same phase. And the cooling oil can be sufficiently circulated in the annular oil passage 70 to cool the permanent magnet 6 efficiently. In particular, in the present embodiment, in each end plate 7, the introduction hole 71 and the discharge hole 72 are arranged every 90 ° and are arranged with a phase difference of 45 ° with respect to the circumferential direction. 71 and the discharge hole 72 will be arrange | positioned at equal intervals, compared with the case where it is not arrange | positioned at equal intervals, cooling oil becomes difficult to be discharged | emitted, and is fully circulated.

Further, in the motor 1 of the present embodiment, the axial length of the rotor core 5 is made longer than the axial length of the stator core 8. Thereby, the endmost steel plate 51 does not affect the characteristics of the motor 1. The groove 52 is not formed in the outermost steel plate 51 of the rotor core 5, and even if the magnetic flux lines between the adjacent permanent magnets 6 are insufficient in the outermost steel plate 51, the torque ripple of the motor 1 is thereby increased. Can be suppressed. In particular, in the present embodiment, the length of each end portion in the axial direction of the rotor core 5 is longer than that of the stator core 8 by 2 to 3 sheets of the steel plate 80. The steel plate 51 does not face the stator core 8 and can suppress the influence on the characteristics of the motor 1.

In addition, in this Embodiment mentioned above, although the case where the shielding part 51a and the discharge part 51b were provided only in the endmost steel plate 51 of the rotor core 5 was demonstrated, it is not limited to this, For example, it adjoins the endmost steel plate 51. The shielding portion and the discharge portion may be provided on a plurality of steel plates 50 including the outermost steel plate 51 such as the steel plate 50 to be processed. That is, the shielding part 51a and the discharge part 51b should just be formed in the outermost steel plate 51 adjacent to the annular oil path 70 among the some steel plates 50. FIG.

Moreover, in this Embodiment mentioned above, although the case where the shielding part 51a and the discharge part 51b were provided in the outermost steel plate 51 located in the most end of the some

steel plates

50 and 51 which comprise the rotor core 5 was demonstrated, For example, the endmost steel plate 51 does not have the shielding part 51a and the discharge part 51b but has the groove 52, and has the shielding part and the discharge part between the endmost steel plate 51 and the end plate 7. You may make it interpose a plate-shaped member. In this case, the material of the plate-like member may be a magnetic body such as a steel plate, but may be other materials such as resin or ceramic.

Moreover, in this Embodiment mentioned above, although the case where both the shielding part 51a and the discharge part 51b were provided in the outermost steel plate 51 was demonstrated, it is not limited to this, For example, the lower part of the rotor 3 is made into cooling oil. The discharge part 51b may not be provided when there is little penetration of the cooling oil between the rotor core 5 and the stator core 8 for reasons such as not being immersed.

In the above-described embodiment, the case where each groove 52 is a single linear groove has been described. However, the present invention is not limited to this. For example, two or more parallel straight lines are used. A groove or a crossing groove may be used. In this case, for example, a total of three grooves including one linear groove and two grooves that are thinner and shallower than the central groove disposed on both sides thereof may be provided. The number, thickness, depth, and the like of each groove 52 can be appropriately set according to the strength of the permanent magnet 6, the required amount of torque ripple reduction, the degree of weight reduction, and the like.

The rotating electrical machine can be mounted on, for example, a hybrid vehicle, an electric vehicle, and the like. In particular, the rotating electrical machine has a cooling device that cools a built-in rotor and a stator. It is suitable for use in those having an annular oil passage.

1 Motor (Rotating electric machine)
2 Rotor shaft (rotor support member)
3 Rotor 4 Stator 5 Rotor core 5a Outer peripheral surface 6 Permanent magnet (magnet)

6a End face

7, 7a, 7b End plate 8 Stator core 9 Stator coil 50 Steel plate (core plate)
51 Endmost steel plate (core plate adjacent to the annular oil passage)

51a Shielding portion

51b Discharging portion 52 Groove 70 Circular oil passage 71 Introduction hole 72 Discharging hole

Claims

A rotor support member;
A rotor core having an annular core plate that is fixedly supported by the rotor support member and is laminated in the axial direction, and at least one end of the rotor core in the axial direction passing through the rotor core in the axial direction A rotor having a plurality of magnets that expose end faces, and a pair of end plates that are clamped by the rotor support member to clamp the rotor core in the axial direction;
In a rotating electrical machine comprising a stator having an annular stator core disposed on the outer peripheral side of the rotor core,
At least one of the end plates circulates cooling oil supplied from the inner peripheral side in a circumferential direction on a side surface facing the end surface of the magnet so as to contact all of the exposed end surfaces of the plurality of magnets. An annular oil passage that cools the magnet
The rotor core is formed in an axial direction on an outer peripheral surface, and is formed in a groove disposed between the plurality of magnets and a core plate adjacent to at least the annular oil passage among the core plates. A shielding portion that shields communication between the groove and the annular oil passage,
Rotating electric machine characterized by that.
The core plate having the shielding portion includes a discharge portion capable of discharging the cooling oil stored in the groove in the axial direction from the groove.
The rotating electrical machine according to claim 1.
The at least one end plate is
An introduction hole for introducing the cooling oil supplied from the inner peripheral side into the annular oil passage;
A discharge hole for discharging the cooling oil circulating in the annular oil passage in the axial direction;
The introduction hole and the discharge hole are arranged with different phases with respect to the circumferential direction.
The rotating electrical machine according to claim 1 or 2, characterized in that
The axial length of the rotor core is longer than the axial length of the stator core,
The rotating electric machine according to any one of claims 1 to 3, wherein the rotating electric machine is provided.