WO2023162096A1

WO2023162096A1 - Rotary electric machine

Info

Publication number: WO2023162096A1
Application number: PCT/JP2022/007635
Authority: WO
Inventors: 裕輔木本
Original assignee: 三菱電機株式会社
Priority date: 2022-02-24
Filing date: 2022-02-24
Publication date: 2023-08-31

Abstract

A non-output-side bracket (3) has a non-output-side bracket inner channel (22) that connects an inlet (20) that allows refrigerant to flow in from the outside and a non-output-side end part of a shaft inner channel (23), an output-side bracket (12) has an output-side bracket inner channel (24) that connects an annular channel (25) and a radial-direction channel (23a), and a housing (2) has an outlet that discharges refrigerant from the annular channel (25) to the outside.

Description

Rotating electric machine

This application relates to a rotating electric machine equipped with a cooling mechanism.

In a rotating electrical machine, for example, heat is generated in the stator and rotor due to rotor iron loss that increases according to vehicle speed or copper loss that depends on the current flowing in the coil. In particular, magnets provided on the rotor undergo irreversible demagnetization when the allowable temperature is exceeded, resulting in a marked drop in performance.

For example, Patent Literature 1 discloses a rotating electrical machine in which a coolant is supplied into the hollow shaft of the rotor to indirectly cool the magnets as highly efficient cooling of the rotor.

Japanese Patent Application Laid-Open No. 2020-162338

However, in the conventional rotary electric machine, since the inlet and outlet of the coolant supplied to the hollow shaft are located on the same end surface, it is difficult for the coolant newly flowing in from the inlet to reach the other end of the shaft. However, there is a problem that the cooling effect is reduced due to the structure that is easily discharged from the outlet immediately.

The present application has been made to solve such problems, and an object thereof is to obtain a rotating electric machine capable of cooling constituent members without lowering the cooling effect.

The rotary electric machine disclosed in the present application includes a rotor that rotates around a shaft, a stator core that covers the outer periphery of the rotor and has a coil wound thereon, a holding frame that is provided on the outer peripheral side of the stator core and holds the stator core, a holding A housing provided on the outer peripheral side of the frame, a non-output side bracket provided on one axial end side of the holding frame and housing, and an output side bracket provided on the other axial end side of the holding frame and housing. , and an annular flow path is provided between the holding frame and the housing, and the shaft has a flow path in the shaft for circulating the refrigerant from the non-output side to the output side in the axial direction, and a flow path on the output side. The non-output side bracket connects the inlet for inflowing the coolant from the outside and the non-output side end of the shaft internal channel to the inlet. a non-output side bracket inner channel, the output side bracket having an output side bracket inner channel connecting the annular channel and the radial direction channel, and the housing extending from the annular channel It has an outlet for discharging the refrigerant to the outside.

According to the rotating electric machine of the present application, the constituent members of the rotating electric machine can be cooled without reducing the cooling effect.

1 is a side sectional view showing the configuration of a rotating electric machine according to Embodiment 1; FIG. FIG. 2 is a cross-sectional view of the rotating electric machine viewed from line II-II in FIG. 1; FIG. 2 is a cross-sectional view of the rotating electric machine seen from line III-III in FIG. 1; FIG. 7 is a radial cross-sectional view showing the configuration of a rotating electric machine according to Embodiment 2; FIG. 11 is a side cross-sectional view showing the configuration of a rotating electric machine according to Embodiment 3; FIG. 6 is a cross-sectional view of the rotating electric machine seen from line VI-VI in FIG. 5; FIG. 6 is a cross-sectional view of the rotating electric machine seen from line VII-VII in FIG. 5; FIG. 6 is a cross-sectional view of the rotating electric machine seen from line VIII-VIII in FIG. 5;

Embodiments of the rotating electric machine disclosed in the present application will be described below with reference to the drawings. Note that the rotating electric machine in each embodiment is a permanent magnet type rotating electric machine.

Embodiment 1.
FIG. 1 is a schematic cross-sectional view along the axial direction of the shaft in the rotating electrical machine of Embodiment 1. FIG. 2 is a diagram of the rotating electric machine viewed from line II-II in FIG. 1, and FIG. 3 is a diagram of the rotating electric machine viewed from line III-III in FIG. A basic configuration of the rotating electric machine according to Embodiment 1 will be described with reference to FIGS. 1, 2, and 3. FIG.

The rotary electric machine 1 is formed by combining a cylindrical housing 2 , a disk-shaped output side bracket 12 , and a disk-shaped non-output side bracket 3 . The housing 2, the output-side bracket 12, and the non-output-side bracket 3 are made of metal, but may be made of resin. If metal is used, the weight of the rotating machine is increased, but the material strength and heat resistance are high. On the other hand, if it is made of resin, it is inferior to metal in terms of strength, but in addition to being excellent in corrosion resistance, the weight of the rotating machine itself can be reduced, and the efficiency of the equipment to which the rotating machine is installed can be improved. can be done. A cylindrical shaft 11 made of metal is provided at the center of the housing 2 , the output-side bracket 12 , and the non-output-side bracket 3 .

The non-output side bracket 3 is composed of a non-output side bracket base 3a and a non-output side bracket cover 3b. The non-output side bracket base 3a has a through hole in the center so that the shaft 11 can pass therethrough, and the non-output side bracket cover 3b covers the non-output side end surface of the shaft 11 penetrating the non-output side bracket base 3a. are placed. Between the non-output side bracket base 3a and the non-output side bracket cover 3b, a non-output side bracket inner flow path 22 is formed extending from the upper portion to the center of the rotary electric machine 1. The non-output side bracket cover 3b has a non-output side bracket cover 3b. An inlet 20 is provided for supplying coolant to the side bracket inner channel 22 . As shown in FIG. 1, the inlet 20 is provided radially outside the shaft 11 in the non-output side bracket cover 3b. The mating surfaces of the non-output side bracket base 3a and the non-output side bracket cover 3b are sealed by an O-ring, welding, or the like so that the coolant does not leak out from the non-output side bracket inner channel 22. As shown in FIG.

The output side bracket 12 is composed of an output side bracket base 12a and an output side bracket cover 12b. The output-side bracket base 12a and the output-side bracket cover 12b are provided with a through hole in the center so that the shaft 11 can pass therethrough. Between the output-side bracket base 12a and the output-side bracket cover 12b, an output-side bracket inner flow path 24 extending from the upper portion to the center of the rotating electric machine 1 is formed. An output-side in-bracket discharge hole 12c is provided for discharging the refrigerant flowing through 24 . The mating surfaces of the output-side bracket base 12a and the output-side bracket cover 12b are sealed by an O-ring, welding, or the like so that the refrigerant does not leak out from the output-side bracket inner channel 24. As shown in FIG.

The shaft 11 protrudes from the output side bracket 12 on the output side. The output of the rotary electric machine 1 is taken out on the side of the output side bracket 12 . In rotating electrical machine 1 , the built-in portion is accommodated and protected by being covered with housing 2 , output-side bracket 12 , and non-output-side bracket 3 .

The shaft 11 is rotatably supported in the output side bracket 12 by the output side bearing 9b. Further, the shaft 11 is rotatably supported in the non-output side bracket 3 by the non-output side bearing 9a. The output side bearing 9b and the non-output side bearing 9a are made of metal and have a donut shape. The output side bearing 9b and the non-output side bearing 9a rotate the shaft 11 accurately and smoothly.

The shaft 11 has a hollow shaft inner channel 23 extending from the non-output side toward the output side, and communicates with the non-output side bracket inner channel 22 at the shaft end face on the non-output side. That is, the shaft end surface on the non-output side of the shaft 11 serves as the inflow path of the shaft internal flow path 23 . A non-output side seal 10a that suppresses the refrigerant from entering the inside of the rotary electric machine when the refrigerant flows from the stationary non-output side bracket inner flow path 22 on the non-output side shaft end surface to the rotating shaft inner flow path 23. is arranged at the end face of the shaft 11 and the center of the non-output side bracket base 3a so that the is coaxial with the non-output side bearing 9a. A radial flow path 23a extending from the shaft internal flow path 23 to the radially outer side of the rotor is formed on the shaft end face on the output side of the shaft. The radial flow path 23 a communicates with the output side bracket inner flow path 24 . That is, the output side of the shaft 11 becomes the outflow port of the in-shaft flow path 23 . The radial flow path 23 a is arranged at the same position as the output side bracket internal flow path 24 in the axial direction of the shaft 11 . When the coolant moves from the rotating shaft inner channel 23 to the stationary output side bracket inner channel 24, the seal 10b in front of the output side, which suppresses the coolant from entering the inside of the rotary electric machine, is coaxial with the non-output side bearing 9a. It is arranged at the center of the end face of the shaft 11 and the output side bracket base 12a so as to be. Further, the end surface of the shaft 11 and the output side are arranged so that the seal 10c at the rear of the output side, which suppresses the refrigerant from flowing out of the rotary electric machine 1 from the output side bracket inner flow path 24, is coaxial with the non-output side bearing 9a. It is arranged in the center of the bracket base 12a.
The radial flow path 23 a is provided on the output side in the axial direction of the shaft 11 relative to the output side bearing 9 b and the seal 10 b in front of the output side. In addition, the radial flow path 23 a is provided on the non-output side of the seal 10 c on the rear side of the output side in the axial direction of the shaft 11 . The

seals

10a, 10b, and 10c may be either oil seals or mechanical seals as long as they can seal against rotational movement.

The refrigerant flows from the inlet 20 into the non-output side bracket inner channel 22 , flows through the non-output side bracket inner channel 22 , and then flows into the shaft inner channel 23 provided in the shaft 11 . In the shaft inner channel 23 , the coolant flows from one end (non-output side) of the shaft 11 to the other end (output side) and is supplied from the radial direction channel 23 a to the output side bracket inner channel 24 .

A cylindrical rotor 60 is fixed to the radially outer side of the shaft 11 inside the housing 2 . The rotor 60 rotates integrally with the shaft 11 with the shaft 11 as a rotation axis. The rotor 60 has a rotor core 6, a plurality of permanent magnets 7, a non-output side end plate 8a and an output side end plate 8b. The rotor core 6 has a cylindrical shape and is formed by laminating thin steel sheets in the axial direction of the shaft 11 having excellent magnetic properties, that is, high magnetic permeability and small iron loss.

The non-output side end plate 8a and the output side end plate 8b fix the rotor core 6 by sandwiching the rotor core 6 therebetween. The non-output side end plate 8a and the output side end plate 8b are disk-shaped and made of metal, but may be made of resin. If metal is used, the weight of the rotating machine is increased, but the material strength and heat resistance are high. On the other hand, if it is made of resin, its strength is inferior to that of metal, but in addition to being excellent in corrosion resistance, the weight of the rotating machine itself can be reduced.

A plurality of permanent magnets 7 are embedded in the rotor core 6 . These permanent magnets 7 are rectangular parallelepipeds and are made of alnico, ferrite or neodymium.

A cylindrical stator 40 is provided on the radially outer side of the shaft 11 so as to face the rotor 60 . The stator 40 has a stator core 4 and coils 5 . The stator core 4 is formed by laminating thin steel plates having excellent magnetic properties in the axial direction of the shaft 11 . The coil 5 is wound or inserted into the stator core 4 with the radial direction of the shaft 11 as an axis. The wound or inserted conductor wire is made of copper having high electrical conductivity, and its cross-sectional shape is circular, but may be rectangular. The stator core 4 is held by shrink fitting in a cylindrical holding frame 13 arranged radially outside the stator 40 . The holding frame 13 is longer than the length of the stator core 4 in the axial direction, and the cross sections of both ends of the holding frame 13 in the axial direction are fixed to the inner end faces of the output side bracket 12 or the non-output side bracket 3 in the axial direction. there is A partition wall 26 (see FIG. 2) extending in the axial direction is provided on the radially outer surface of the holding frame 13 .

The housing 2 of the rotary electric machine 1 is provided on the radially outer side of the holding frame 13 , and similarly to the holding frame 13 , the cross section in the axial direction is the inner end face in the axial direction of the output side bracket 12 or the non-output side bracket 3 . is fixed with

As shown in FIG. 2, an annular flow path 25 is formed by the radially outer surface of the holding frame 13 and the radially inner surface of the housing 2 . A sealing member (not shown) is arranged between both end surfaces of the holding frame 13 and the housing 2 in the axial direction to suppress leakage of coolant from the annular flow path 25 into the inside of the rotating electric machine. However, when the fixing method is welding, the possibility of refrigerant leakage is small and the sealing member may not be arranged.

The annular channel 25 communicates with the output-side in-bracket discharge hole 12 c , and the refrigerant flowing through the output-side in-bracket channel 24 is supplied into the annular channel 25 . The supplied coolant circulates 360 degrees in the annular channel 25 and is discharged from the outlet 21 provided on the radially outer surface of the housing 2 for discharging the coolant. The partition wall 26 functions so that the refrigerant supplied from the output-side bracket discharge hole 12c is not discharged from the outlet 21 immediately.

As shown in FIG. 2, the partition 26 is located on the circumference of the annular channel 25 between the holding frame 13 and the housing 2 and has one end fixed to the holding frame 13 and the other end fixed to the housing 2 . Get close. (Actually, since a gap is required during assembly, the partition 26 is not fixed to the housing.) Moreover, the partition 26 is positioned between the housing 2 and the holding frame 13 in the depth direction of FIG. is a member extending from the output side to the non-output side of the As a result, the coolant that has flowed from the output-side bracket discharge hole 12 c (see FIG. 1 ) flows in one direction of the annular channel 25 and is not immediately discharged from the outlet 21 . Further, the annular channel 25 communicates with the output side bracket inner channel 24 via the output side bracket discharge hole 12c on the output side, but communicates with the non-output side bracket inner channel 22 on the non-output side. Not in direct communication.

The refrigerant discharged from the outlet 21 is sucked out by the external pump 100 and is heated to a predetermined temperature by the heat exchanger 101. After that, the refrigerant is cooled to a predetermined temperature by the heat exchanger 101. Refrigerant is supplied.

As described above, in the rotating electric machine according to Embodiment 1, the cooling medium is indirectly cooled by passing the coolant through the shaft inner flow path 23 in which the permanent magnet 7 and the rotor core 6 as heat generating elements are provided in the axial direction at the center of the shaft 11. can do.

In addition, in the axial direction of the shaft 11, the shaft inner channel 23 has an inlet port on one end side, and an outlet port of the shaft inner channel 23 on the other end side different from the one end side. As a result, the coolant can flow from one end of the shaft 11 to the other end. As a result, the heating element can be cooled over the entire length of the shaft 11 in the axial direction, and the rotating electric machine 1 can be cooled without lowering the cooling effect.

In addition, since the non-output side bearing 9a and the output side bearing 9b that support the rotation of the shaft 11 are attached to the end face of the shaft 11, the refrigerant flows through the shaft internal flow path 23, thereby preventing seizure due to friction during rotation. It can be suppressed by cooling.

In addition, the non-output side bracket inner channel 22 cools the non-output side bracket base 3a and the non-output side bracket cover 3b. The output-side bracket inner channel 24 cools the output-side bracket base 12a and the output-side bracket cover 12b. In the electric rotating machine 1, air flow is generated inside the electric rotating machine 1 when the rotor 60 composed of the stator core 4, the permanent magnet 7, the non-output side end plate 8a, and the output side end plate 8b rotates. Air circulates on the surfaces of the coil 5 and the shaft 11 from the non-output side end plate 8a and the output side end plate 8b. This air flow is called an internal circulation flow (see the dashed arrow in FIG. 1). The permanent magnet 7, rotor core 6, coil 5, and stator core 4 that generate heat due to the internal circulation flow can be cooled through the air.

The internal circulation flow warmed by heat removal from the permanent magnet 7, the rotor core 6, the coil 5, and the stator core 4 is cooled in the non-output side bracket inner flow path 22 and the output side bracket base flow path 24. 3a and the output side bracket base 12a are in contact with the warmed internal circulating flow to cool the air.

In addition, as shown in FIG. 3, a radial flow path 23a is provided on the output side so as to communicate with the shaft internal flow path 23 of the shaft 11 . When the coolant flows into the shaft inner channel 23 when the rotor 60 rotates, the pressure of the coolant in the shaft inner channel 23 decreases due to the centrifugal force caused by the rotation of the rotor 60, and then the coolant is output from the radial direction channel 23a. The pressure of the refrigerant rises as it flows toward the side bracket inner channel 24 . The shaft 11 becomes a simple centrifugal pump because the radial flow path 23a functions as an impeller of the centrifugal pump. Since the centrifugal pump can draw the refrigerant into the shaft 11 from the upstream side, the power consumption of the external pump 100 can be suppressed, and the energy of the entire motor system can be saved.

In addition, in the axial direction of the shaft 11 , the radial flow path 23 a is arranged at the same position as the output side bracket inner flow path 24 . As a result, the coolant can efficiently flow from the radial flow path 23 a to the output side bracket internal flow path 24 .

The radial flow path 23a is provided on the output side in the axial direction of the shaft 11 relative to the output side bearing 9b and the seal 10b in front of the output side. As a result, it is possible to suppress coolant leakage into the rotating electrical machine 1, so that the constituent members of the rotating electrical machine 1 can be cooled without reducing the cooling efficiency. In addition, the radial flow path 23 a is provided on the non-output side of the seal 10 c on the rear side of the output side in the axial direction of the shaft 11 . As a result, refrigerant leakage to the outside of the rotating electric machine 1 can be suppressed, so that the constituent members of the rotating electric machine 1 can be cooled without reducing the cooling efficiency.

Embodiment 2.
Next, a rotating electric machine according to Embodiment 2 will be described with reference to FIG.

A rotor 60 that generates an output by rotation in the rotary electric machine 1 has the shaft 11 as its axis center and is composed of a rotor core 6 and permanent magnets 7 in its radial direction.

In the shaft 11, a shaft inner channel 23 is formed in the axial direction for passing the coolant that has flowed from the inlet 20 via the non-output side bracket inner channel 22. As shown in FIG. In the structure inside the shaft 11 , a convex projection 14 extending toward the center of the shaft 11 is provided on the wall surface of the shaft inside channel 23 . The protrusion 14 is formed to extend in the axial direction of the rotary electric machine 1 from the inlet of the shaft internal flow path 23 to the front of the radial flow path 23a. The convex protrusion 14 increases the contact area with the coolant and also reduces the cross-sectional area of the channel, compared to the cylindrical shaft inner channel 23 shown in FIG. do. As a result, the heat generated by the rotor core 6 and the permanent magnets 7 can be efficiently cooled.

In addition, as the radial flow path 23a rotates, the pressure in the shaft inner flow path 23 decreases, and the pressure in the radial flow path 23a rises from the center of the shaft to the outermost diameter, producing a centrifugal pump effect. By providing the convex projection 14, the pressure loss increases in proportion to the flow velocity in the shaft inner channel 23, increasing the load on the external pump 100. However, the centrifugal pump effect significantly increases the load on the external pump 100. The cooling effect can be improved without increasing it.

In addition, as in the first embodiment, the rotation of the rotor 60 generates an internal circulation flow that flows inside the motor, and the permanent magnets 7 and the rotor core 6 that generate heat can be cooled. The air heated by the heat generation can be continuously cooled by indirect heat exchange with the refrigerant flowing through the non-output side bracket inner channel 22 and the output side bracket inner channel 24 .

In the present embodiment, the projections 14 are rectangular and four projections are arranged in the shaft 11. There is no need to have one, and the same effect as described above can be obtained even with a round shape, a triangular shape, or a plurality of shapes.

Embodiment 3.
Next, a rotating electric machine according to Embodiment 3 will be described. FIG. 5 is a schematic cross-sectional view along the axial direction of the shaft. 6 is a view of the rotating machine viewed from line VI-VI in FIG. 5, FIG. 7 is a view of the rotating machine viewed from line VII-VII in FIG. 5, and FIG. is a diagram of the rotating machine viewed from the VIII-VIII line in FIG.

In the rotor 60 in which the rotor core 6 and the permanent magnets 7 are located on the radial side of the shaft 11 , the rotor core 6 and the rotor core 6 laminated in the axial direction of the rotating electric machine are provided on the output side and non-output side end faces of the rotor 60 . A non-output side end plate 8a and an output side end plate 8b are provided to prevent the axially inserted permanent magnet 7 from disassembling due to centrifugal force or external force.

7 shows a cross section of the non-output side end plate 8a perpendicular to the axial direction, and FIG. 8 shows a cross section of the output side end plate 8b perpendicular to the axial direction.

7, a semicircular non-output-side end plate internal flow path 32 is formed in the cross-section of the non-output-side end plate 8a. It communicates with a non-output-side radial flow channel 30 which is provided so as to divert the flow in the radial direction. That is, the shaft 11 has, on the non-output side, the non-output side radial flow path 30 that communicates the shaft internal flow path 23 and the non-output side end plate internal flow path 32 .

8, a semicircular output-side end plate internal flow path 33 is formed in the cross section of the output-side end plate 8b. It is configured to communicate with an output-side radial flow path 31 that is provided so as to divide the flow in the radial direction. That is, the shaft 11 has, on the output side, an output-side radial flow channel 31 that communicates the output-side end plate internal flow channel 33 and the shaft internal flow channel 23 .

FIG. 6 shows a vertical cross section at the center position of the rotating electrical machine 1 . Inside the permanent magnets 7 inserted in the rotor core 6 in the radial direction, a cylindrical magnet flow path 34 extends in the axial direction of the rotating electrical machine 1 . The magnet flow path 34 is configured such that the non-output side end plate inner flow path 32 and the output side end plate inner flow path 33 communicate with each other.

The coolant supplied from the inlet 20 is supplied to the shaft inner channel 23 via the non-output side bracket inner channel 22 . A part of the coolant flowing through the in-shaft channel 23 flows into the non-output-side radial channel 30 and the rest flows through the in-shaft channel 23 toward the output side. The coolant flowing through the non-output side radial flow passages 30 is supplied to the non-output side inner end plate flow passages 32 . When the rotor 60 rotates, in the non-output side end plate inner flow passage 32 , the refrigerant becomes a liquid film and accumulates in the outermost diameter portion of the non-output side end plate inner flow passage 32 due to centrifugal force. The accumulated coolant is sequentially supplied to a plurality of magnet flow paths 34 arranged in the rotor core 6 and reaches the output side end plate inner flow path 33 . Refrigerant accumulates in the output-side end plate internal flow path 33 due to centrifugal force, is sequentially supplied to the output-side radial flow path 31 , and rejoins the refrigerant flowing through the shaft internal flow path 23 . Thus, the non-output side end plate 8a has the non-output side end plate inner channel 32 provided over the entire circumference of the shaft 11, and the output side end plate 8b It has an output-side end plate inner channel 33 provided over the entire circumference.

The cooling medium can cool the permanent magnets 7 and the rotor core 6 that generate heat by flowing through the magnet flow path 34 .

In Embodiment 3, the shape of the magnet flow path 34 is cylindrical as an example, but it is not limited to this, and may be rectangular or triangular. The magnet flow path 34 may be arranged under, above, or on the side of the permanent magnet 7 . In addition, when cooling water such as LLC (Long Life Coolant) is used in the magnet flow path 34, the cooling water can be It is also possible to suppress electric leakage due to sealing and leakage.

While this application describes various exemplary embodiments and examples, various features, aspects, and functions described in one or more embodiments may not apply to particular embodiments. can be applied to the embodiments singly or in various combinations.
Accordingly, numerous variations not illustrated are envisioned within the scope of the technology disclosed herein. For example, modification, addition or omission of at least one component, extraction of at least one component, and combination with components of other embodiments shall be included.

1 rotating electric machine, 2 housing, 3 non-output side bracket, 3a non-output side bracket base, 3b non-output side bracket cover, 4 stator core, 5 coil, 6 rotor core, 7 permanent magnet, 8a non-output side end plate, 8b output side End plate, 9a non-output side bearing, 9b output side bearing, 10a, 10b, 10c seal, 11 shaft, 12 output side bracket, 12a output side bracket base, 12b output side bracket cover, 12c discharge hole in output side bracket, 13 Holding frame, 14 projection, 20 inlet, 21 outlet, 22 non-output side bracket inner flow path, 23 shaft inner flow path, 23a radial flow path, 24 output side bracket inner flow path, 25 annular flow path, 26 partition wall , 30 non-output side radial flow path, 31 output side radial flow path, 32 non-output side end plate internal flow path, 33 output side end plate internal flow path, 34 magnet flow path, 60 rotor, 101 heat exchanger

Claims

a rotor that rotates about the shaft;
a stator core covering the outer periphery of the rotor and having a coil wound thereon;
a holding frame provided on the outer peripheral side of the stator core and holding the stator core;
a housing provided on the outer peripheral side of the holding frame;
a non-output side bracket provided at one axial end side of the holding frame and the housing;
the holding frame and an output side bracket provided on the other end side of the housing in the axial direction;
An annular channel is provided between the holding frame and the housing,
The shaft has an in-shaft channel for circulating the coolant from the non-output side to the output side in the axial direction, and a radial channel provided on the output side for discharging the coolant in the radial direction,
The non-output side bracket has an inlet for inflowing refrigerant from the outside, and a non-output side bracket inner channel connecting the inlet and the non-output side end of the shaft inner channel,
the output-side bracket has an output-side bracket inner channel connecting the annular channel and the radial channel;
The rotary electric machine, wherein the housing has an outlet for discharging the coolant from the annular flow path to the outside.
The in-shaft flow path has an inlet port of the in-shaft flow path on the non-output side,
an outlet of the in-shaft channel on the output side;
The rotary electric machine according to claim 1, characterized by comprising:
3. The radial flow path is provided closer to the output side than a seal arranged between the output side bracket and the shaft in the axial direction of the shaft. The rotary electric machine described in .
The electric rotating machine according to any one of claims 1 to 3, characterized in that a projection extending toward the center of the shaft is provided on the wall surface of the channel in the shaft.
The rotor includes a rotor core in which permanent magnets are embedded, and a non-output side end plate and an output side end plate sandwiching the rotor core,
the non-output-side end plate has a non-output-side end plate inner channel provided along the entire circumference of the shaft on the outer peripheral side;
the output-side end plate has an output-side end plate inner flow path provided along the entire outer circumference of the shaft,
the rotor core has a magnet flow path for cooling the permanent magnets arranged from the non-output side to the output side along the axial direction;
The shaft includes, on the non-output side, a non-output-side radial flow path that communicates between the shaft-internal flow path and the non-output-side end plate internal flow path, and on the output side, in the output-side end plate. having an output-side radial flow path communicating between the flow path and the shaft-internal flow path;
5. The rotating magnet according to any one of claims 1 to 4, wherein the magnet flow path communicates the non-output side end plate internal flow path and the non-output side end plate internal flow path. electric machine.