Rotating electric machines and rotating electric machine units

Abstract

In a rotary electric machine (1) comprising a rotary shaft (3), a rotor (4) which is fixed to an outer circumference of the rotary shaft (3) and has a magnet (72), and a stator (5) disposed on the outer circumference side of the rotor (4), the magnet (72) is formed so as to extend from one end (Y1) to the other end (Y2) of the rotor (4) in the axial direction (Y), the rotor (4) comprises a first flow passage (83A) and a second flow passage (83B) which extend from the one end (Y1) to the other end (Y2) of the rotor (4) and are used to cause a refrigerant to flow, at least one of the first flow passage (83A) or the second flow passage (83B) is formed along the magnet (72), and a first flow passage (82A) and a second flow passage (83A) are opposite to each other in a direction of the flow of the refrigerant in the axial direction (Y).

Description

Technical Field

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[0001] This application relates to a rotating electrical machine and a rotating electrical machine unit.

Background Art

[0002] In a conventional rotating electrical machine, a rotor has a stator on the outer side or the axial side of the rotor. Since the rotor magnet generates heat, the rotor magnet becomes hot. When the temperature of the rotor magnet rises, demagnetization occurs and it becomes defective. Therefore, it is necessary to reduce the temperature of the rotor magnet. For this reason, a cooling flow path structure for cooling the rotor magnet is provided inside the rotor, and a structure for improving the cooling performance of the rotor magnet by flowing a coolant through this cooling flow path is known (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In conventional rotating electrical machines and rotating electrical machine units, since all of the plurality of cooling flow paths are formed by branching from the center in the axial direction of the rotor, the flow in each cooling flow path becomes the same, making it difficult to efficiently cool the rotor and causing a bias in the temperature distribution within the rotor.

[0005] This application discloses a technique for solving the above problems, and an object thereof is to provide a rotating electrical machine and a rotating electrical machine unit that can efficiently cool the rotor and uniformize the temperature distribution within the rotor.

Means for Solving the Problems

[0006] This disclosure The rotating electrical machine provided is a rotating shaft, and A rotor fixed to the outer periphery of the rotating shaft and having magnets, In a rotating electric machine including a stator installed on the outer peripheral side of the rotor, The magnet is formed to extend from one end side to the other end side in the axial direction of the rotor, The rotor includes a first flow path and a second flow path that extend from one end side to the other end side in the axial direction of the rotor and through which a refrigerant flows, At least one of the first flow path and the second flow path is formed along the magnet, The first flow path and the second flow path are such that the directions in which the refrigerant flows in the axial direction are opposite. the law of nature, The aforementioned rotating shaft is Within the rotating shaft, an internal shaft passage for flowing the refrigerant extends from one end to the other end in the axial direction of the rotor, A first communication channel that communicates with the first channel from one end of the axial channel within the shaft, The system includes a second communicating passage that communicates with the second passage from the other axial end of the aforementioned internal shaft passage, The internal shaft passage has a refrigerant inlet on one end of the rotating shaft in the axial direction, The cross-sectional area of ​​the first connecting channel is made smaller than the cross-sectional area of ​​the second connecting channel. are. Furthermore, the rotating electric machine disclosed herein is The axis of rotation and A rotor having a magnet is fixed to the outer circumference of the aforementioned rotating shaft, In a rotating electric machine comprising a stator installed on the outer circumference of the rotor, The magnet is formed extending from one end to the other end in the axial direction of the rotor. The rotor comprises a first flow path and a second flow path for circulating refrigerant, which extend from one end to the other end in the axial direction of the rotor. At least one of the first channel and the second channel is formed along the magnet, The first flow path and the second flow path have opposite directions in which the refrigerant flows axially. The aforementioned rotating shaft is Within the rotating shaft, an internal shaft passage for flowing the refrigerant extends from one end to the other end in the axial direction of the rotor, A first communication channel that communicates with the first channel from one end of the axial channel within the shaft, A second communication channel that communicates with the second channel from the other axial end of the aforementioned internal channel, The rotor is provided with end plates on one end and the other end in the axial direction, The aforementioned end plate is Between the end plate and the axial end face of the rotor, Multiple flow paths through which the refrigerant is rectified, The multiple flow paths are separated from each other by isolation walls, Multiple first channels and multiple second channels are formed, The formation positions of the first channel and the second channel are, The distance from the central axis of rotation of the rotor is the same, The first channel and the second channel are formed alternately in the circumferential direction. One end plate, the end face on one axial end of the rotor, and the isolation wall, The first communication channel and the end channel connecting the first channel are separated and formed, and the ejection channel connected to the second channel extends radially outward from the rotor and connects to the outside, The other end plate, the end face on the other end of the rotor in the axial direction, and the separating wall, The second communication channel and the end channel connecting the second channel are separated and formed, and the ejection channel connected to the first channel extends radially outward from the rotor and connects to the outside, The end channel formed by one of the end plates, the end face on one axial end of the rotor, and the isolation wall is Multiple first flow channels are provided in an integrated region that connects them to one another around the rotating shaft, The end flow path formed by the other end plate, the end face on the other end side in the axial direction of the rotor, and the isolation wall is Multiple second flow channels are provided in an integrated region that connects them to one another around the rotating shaft. The ejection channel is provided on the outer circumference side of the end channel, which is located in a region where the end plates of one and the other are integrated. These are provided corresponding to the formation positions of the first and second flow channels, respectively. Also, This disclosure the rotating electrical machine unit to be provided is The number of times mentioned above in a rotating electrical machine unit in which a gear is connected to the rotating shaft of the rotating electrical machine, the gear is installed on the other axial end side opposite to the one axial end side where the refrigerant is introduced into the axial flow path in the shaft.

Advantages of the Invention

[0007] According to the rotating electrical machine and the rotating electrical machine unit disclosed in the present application, the rotor can be efficiently cooled and the temperature distribution inside the rotor can be made uniform.

Brief Description of the Drawings

[0008] [Figure 1] It is a cross-sectional view showing the configuration of the rotating electrical machine according to Embodiment 1. [[ID=四十八]] [Figure 2] It is a cross-sectional view showing an enlarged part of the rotating electrical machine shown in FIG. 1. [Figure 3] It is a cross-sectional view showing a part of another configuration of the rotating electrical machine according to Embodiment 1. [Figure 4] It is a cross-sectional view showing the configuration of the rotating electrical machine according to Embodiment 2. [Figure 5] It is a cross-sectional view showing an enlarged part of the rotating electrical machine shown in FIG. 4. [Figure 6] It is a cross-sectional view showing the configuration of the rotating electrical machine according to Embodiment 3. [[ID=六十四]] [Figure 7]Figure 6 is a plan view showing the configuration of the rotor of the rotating electric machine. [Figure 8] Figure 6 is a plan view showing the configuration of the end plate on one axial end of the rotor of the rotating electric machine. [Figure 9] Figure 6 is a plan view showing the configuration of the end plate on the other axial end of the rotor of the rotating electric machine. [Figure 10] This is a cross-sectional view showing another configuration of the rotor of the rotating electric machine according to Embodiment 3. [Figure 11] This is a plan view showing the configuration of the rotor of a rotating electric machine according to Embodiment 4. [Figure 12] This is a plan view showing another configuration of the rotor of the rotating electric machine according to Embodiment 4. [Figure 13] This is a plan view showing the configuration of the rotor of a rotating electric machine according to Embodiment 5. [Figure 14] This is a plan view showing another configuration of the rotor of the rotating electric machine according to Embodiment 5. [Figure 15] This is a plan view showing another configuration of the rotor of the rotating electric machine according to Embodiment 5. [Figure 16] This is a plan view showing the configuration of the end plate on one axial end of the rotor of a rotating electric machine according to Embodiment 6. [Figure 17] This is a plan view showing another configuration of the end plate on one axial end of the rotor of the rotating electric machine according to Embodiment 6. [Figure 18] This is a cross-sectional view showing the configuration of the rotor of a rotating electric machine according to Embodiment 7. [Figure 19] Figure 18 is a plan view showing the configuration of the end plate on the other axial end of the rotor of the rotating electric machine. [Figure 20] This is a cross-sectional view showing the configuration of the rotating electric machine unit according to Embodiment 8. [Modes for carrying out the invention]

[0009] In the following description, each direction in the rotating electric machine 1 will be referred to as the circumferential direction Z, axial direction Y, one end of the axial direction Y Y1, the other end of the axial direction Y Y2, the radial direction X, the outer side of the radial direction X X1, and the inner side of the radial direction X X2, respectively. Therefore, these directions are the same for the stator 5 and rotor 4, as well as for other parts, and each direction will be described and explained based on these directions. Furthermore, in this application, "flow path" always refers to a cooling flow path for passing a refrigerant, and its explanation will be omitted as appropriate.

[0010] Furthermore, the rotating electric machine 1 is used in hybrid vehicles, electric vehicles, air conditioners, industrial motors, and railways, for example, in internal combustion engines such as gasoline engines and diesel engines, or in motors powered by rechargeable secondary batteries. The rotating electric machine 1 also has at least one function: that of a motor that receives power and generates driving force, and that of a generator.

[0011] Embodiment 1. Figure 1 is a cross-sectional view showing the configuration of a rotating electric machine according to Embodiment 1. Figure 2 is an enlarged cross-sectional view showing a part of the rotating electric machine shown in Figure 1.

[0012] As shown in Figure 1, the rotating electric machine 1 consists of a housing 2, a rotating shaft 3 formed through the housing 2, a rotor 4 fixed to the rotating shaft 3 and installed on the outer circumference of the rotating shaft 3, and a stator 5 installed on the outer circumference of the rotor 4. The rotating shaft 3 extends in the axial direction Y along the central axis Q of rotation, is supported by the housing 2 by bearings 11 of the bearings, and is installed so as to be rotatable about the central axis Q.

[0013] The rotor 4 comprises a rotor core 41, permanent magnets (hereinafter referred to as magnets) 42 embedded in the rotor core 41, and a flux barrier 43. The magnets 42 are formed extending from one end Y1 to the other end Y2 in the axial direction Y of the rotor 4. In other words, the rotating electric machine 1 of this embodiment 1 is an example of an IPM motor (Interior Permanent Magnet Motor). However, it is not limited to this, and it may also be an SPM motor (Surface Permanent Magnet Motor) in which multiple magnets are attached to the outer circumferential surface of the rotor core.

[0014] The rotor core 41 has a cylindrical shape and is composed of multiple electromagnetic steel sheets stacked in the axial direction Y. The rotor core 41 is installed on the outer surface of the rotating shaft 3 by fitting, press-fitting, or shrink-fitting. Alternatively, the rotor 4 and the rotating shaft 3 may be fitted together in a key shape, so that the rotor 4 and the rotating shaft 3 can rotate integrally. The flux barrier 43 is a hole provided to prevent magnetic flux from the magnet 42 from leaking onto the outer surface of the rotor 4, or a hole provided to prevent stress concentration in the rotor 4, and is filled with air, resin, or a non-magnetic material.

[0015] The stator 5 is positioned on the outer circumference of the rotor 4 and has a stator core and coils 51 wound around the stator core. The stator core is made up of multiple electromagnetic steel sheets stacked in the axial direction Y. Note that the stator core and rotor core 41 are not limited to electromagnetic steel sheets and may be integrally molded from a powder magnetic core. Multiple coils 51 are mounted on the stator 5 at intervals in the circumferential direction Z. When each coil 51 is energized, a rotating magnetic field is generated around the stator 5, and the rotation shaft 3 and rotor 4 rotate integrally with respect to the housing 2 and stator 5 due to the action of this rotating magnetic field. The housing 2 is a bottomed cylindrical shape and houses the rotor 4 and stator 5, and rotatably supports the rotation shaft 3 via a pair of bearings 11.

[0016] Next, the cooling passages for circulating the refrigerant to cool the rotor 4 will be described. The refrigerant refers to, for example, air, water, oil, or other refrigerant (for heat transport) fluids, and any refrigerant capable of cooling the rotor 4 may be used. The cooling passages include an in-shaft passage 81, a first passage 83A, a second passage 83B, a first connecting passage 81A, a second connecting passage 81B, and an end passage 82A.

[0017] The first flow path 83A and the second flow path 83B are formed along the magnet 42, extending from one end Y1 to the other end Y2 of the rotor 4 in the axial direction Y, and the refrigerant flows in opposite directions in the axial direction Y within the first flow path 83A and the second flow path 83B. Furthermore, the first flow path 83A is formed by penetrating the rotor 4 in the axial direction Y at the other end Y2 in the axial direction Y. The second flow path 83B is formed by penetrating the rotor 4 in the axial direction Y at one end Y1 in the axial direction Y.

[0018] The internal shaft passage 81 is formed within the rotating shaft 3, extending in the axial direction Y, at a position corresponding to one end Y1 to the other end Y2 of the rotor 4 in the axial direction Y. However, in this case, an inlet 810 is formed at one end Y1 in the axial direction Y of the rotating shaft 3 in order to introduce a refrigerant into the rotating electric machine 1 from the outside. Therefore, the internal shaft passage 81 is formed continuously up to one end Y1 in the axial direction Y of the rotating shaft 3. Note that in Figure 1, the rotating shaft 3 is partially hollowed out to form the internal shaft passage 81, but this is not the only option, and for example, the internal shaft passage may be formed by penetrating the rotating shaft 3 in the axial direction Y.

[0019] The first communication channel 81A is formed at one end Y1 of the rotor 4 in the axial direction Y, branching off from the internal channel 81 and extending outward in the radial direction X1. The second communication channel 81B is formed at the other end Y2 of the rotor 4 in the axial direction Y, curving outward in the radial direction X1 from the internal channel 81.

[0020] The end channel 82A is formed in the rotor core 41, extending radially outward X1, to connect the first communication channel 81A and the first channel 83A, and to connect the second communication channel 81B and the second channel 83B. The end channel 82A may be shaped to mitigate torque fluctuations and torque ripple, taking the Coriolis force into consideration.

[0021] Next, the flow of refrigerant in the rotating electric machine 1 of Embodiment 1 configured as described above will be explained. In Figures 1 and 2, the flow of refrigerant is indicated by arrows. As shown in Figures 1 and 2, the refrigerant is introduced from the inlet 810 of the internal shaft flow path 81. Therefore, the refrigerant flows through the internal shaft flow path 81 from one end Y1 in the axial direction Y to the other end Y2. A portion of the refrigerant is then branched off in the first communication flow path 81A formed at one end Y1 in the axial direction Y of the internal shaft flow path 81, and supplied to the first flow path 83A via the end flow path 82A.

[0022] The supply of refrigerant to this first flow path 83A is achieved when the refrigerant introduced into the in-shaft flow path 81 flows outward in the radial direction X1 due to the centrifugal force generated by the rotation of the rotor 4, and flows into the end flow path 82A at one end Y1 of the axial direction Y of the rotor 4. The principle of refrigerant flow from the in-shaft flow path 81 to the first flow path 83A due to the centrifugal force of the rotor 4 is the same in the following embodiments, so its explanation will be omitted as appropriate.

[0023] In the first flow path 83A, the refrigerant flows from one end Y1 to the other end Y2 in the axial direction Y. This efficiently cools the magnet 42 and rotor core 41, which are close to the first flow path 83A. The axial flow of the refrigerant in the first flow path 83A is in the same direction as the axial flow of the refrigerant in the in-shaft flow path 81. The refrigerant is then discharged to the outside of the rotor 4 from the other end Y2 in the axial direction Y of the first flow path 83A.

[0024] The supply of refrigerant to this second flow path 83B is achieved when the refrigerant introduced into the in-shaft flow path 81 flows outward in the radial direction X1 due to the centrifugal force generated by the rotation of the rotor 4, and flows into the end flow path 82A at the other end Y2 in the axial direction Y of the rotor 4. The principle of refrigerant flow from the in-shaft flow path 81 to the second flow path 83B due to the centrifugal force of the rotor 4 is the same in the following embodiments, so its explanation will be omitted as appropriate.

[0025] Furthermore, another portion of the refrigerant does not branch into the first communication channel 81A but flows through the internal shaft channel 81 to the other end Y2 in the axial direction Y, where it flows into the second communication channel 81B and is supplied to the second channel 83B via the end channel 82A. The refrigerant flow in the axial direction Y of the second channel 83B is in the opposite direction to the axial direction Y flow of the refrigerant in the internal shaft channel 81, that is, the refrigerant flows from the other end Y2 to the one end Y1 in the axial direction Y.

[0026] As a result, the magnet 42 and rotor core 41, which are close to the second flow path 83B, are efficiently cooled. The coolant is then discharged to the outside of the rotor 4 from one end Y1 in the axial direction Y of the second flow path 83B. In this way, the axial flow Y of the coolant within the rotor 4 can be made to flow in opposite directions to the first flow path 83A and the second flow path 83B, so that the rotor 4 can be efficiently cooled and the temperature distribution within the rotor 4 can be made uniform. Therefore, the maximum temperature of the rotor 4 can be reduced.

[0027] Furthermore, this eliminates the problem of demagnetization when the temperature of the magnet 42 rises. In addition, the magnet 42 can be cooled efficiently, and this reduction in the temperature of the magnet 42 makes it possible to reduce the amount of rare earth elements in the magnet 42 itself, improve efficiency, and increase output.

[0028] The refrigerant discharged from the rotor 4 is then transferred to the outside of the rotating electric machine 1 by a pump (not shown), cooled by a radiator, for example, and then reintroduced into the rotating electric machine 1 through the inlet 810. Alternatively, the refrigerant may be circulated within the rotating electric machine 1, cooled by a cooling unit installed inside the rotating electric machine 1, and then reintroduced through an external flow path to the rotating electric machine 1 via the inlet 810.

[0029] In this way, the refrigerant passes through the rotor 4 via the first passage 83A and the second passage 83B, thereby reducing the temperature rise of the magnets 42 embedded in the rotor 4. In particular, when a refrigerant in a liquid state or a gas-liquid two-phase state is introduced from the rotating shaft 3 into the rotor 4, the refrigerant becomes a gaseous state and is discharged outside the rotor 4. By appropriately setting the flow rate, frictional losses caused by refrigerant friction can be significantly reduced. With this setting, the amount of refrigerant can be adjusted according to the magnets 42 of the rotor 4, allowing the magnets 42 to be cooled more efficiently.

[0030] In the above embodiment 1, an example was shown in which an internal shaft passage 81 is provided and the refrigerant flows through it in communication with the first passage 83A and the second passage 83B. However, the invention is not limited to this, and for example, as shown in Figure 3, the rotor 4 may be provided with only the first passage 83A and the second passage 83B as refrigerant passages, and both passages 83A and 83B penetrate the rotor 4 in the axial direction Y on both sides of the axial direction Y, one end Y1 and the other end Y2. A fan 100 may be provided on the outside of the rotor 4, or blades may be provided on the shaft end of the rotor 4. The refrigerant filled in the rotating electric machine 1 is then used with the fan 100 to generate a flow as shown by the arrow. With this configuration, the flow of refrigerant in the first passage 83A and the second passage 83B can be set in opposite directions in the axial direction Y, similar to the above embodiment 1, so that the temperature distribution inside the rotor 4 can be made uniform.

[0031] According to the rotating electric machine of Embodiment 1 configured as described above, The axis of rotation and A rotor having a magnet is fixed to the outer circumference of the aforementioned rotating shaft, In a rotating electric machine comprising a stator installed on the outer circumference of the rotor, The magnet is formed extending from one end to the other end in the axial direction of the rotor. The rotor comprises a first flow path and a second flow path for circulating refrigerant, which extend from one end to the other end in the axial direction of the rotor. At least one of the first channel and the second channel is formed along the magnet, Since the first flow path and the second flow path have opposite directions in which the refrigerant flows axially, Because the refrigerant flow in the first and second channels can be set to opposite directions in the axial direction, the cooling efficiency of the rotor is improved, and the temperature distribution within the rotor can be made more uniform. This reduces the maximum temperature of the rotating electric machine. Therefore, it is possible to make the rotating electric machine smaller and more powerful overall.

[0032] Furthermore, according to the rotating electric machine in Embodiment 1, The aforementioned rotating shaft is Within the rotating shaft, an internal shaft passage for flowing the refrigerant extends from one end to the other end in the axial direction of the rotor, A first communication channel that communicates with the first channel from one end of the axial channel within the shaft, Since it is equipped with a second communication channel that communicates with the second channel from the other axial end of the aforementioned internal channel, The flow of refrigerant in the first and second flow paths can be reliably set to opposite directions in the axial direction.

[0033] Embodiment 2. In the first embodiment described above, an example was shown in which end channels 82A connected to the first channel 83A and the second channel 83B, respectively, are provided at both ends of the rotor core 41 in the axial direction Y. In this second embodiment, however, a case will be described in which an end plate 7A is installed at one end Y1 of the rotor core 41 in the axial direction Y, and an end plate 7B is installed at the other end Y2.

[0034] Figure 4 is a cross-sectional view showing the configuration of a rotating electric machine according to Embodiment 2. Figure 5 is an enlarged cross-sectional view showing a part of the rotating electric machine shown in Figure 4. Note that parts similar to those in Embodiment 1 are denoted by the same reference numerals and their descriptions are omitted.

[0035] As shown in Figure 4, end plates 7A and 7B are installed at both ends of the rotor 4 in the axial direction Y, respectively, so as to face the end faces of the rotor core 41 in the axial direction Y. The end plates 7A and 7B sandwich the laminated structure of the rotor core 41, which is made of electromagnetic steel sheets that constitute the rotor 4, in the axial direction Y. When the end of the rotor core 41 facing the magnet 42 is magnetized, a force acts to separate the rotor core 41 due to the action of the magnetic force, but separation is prevented by placing the end plates 7A and 7B and sandwiching the laminated structure of the rotor core 41.

[0036] The end plates 7A and 7B are integrally fixed to the rotating shaft 3 by methods such as screw fastening or crimping, and rotate in conjunction with the rotation of the rotating shaft 3. The end plates 7A and 7B may be formed from, for example, electromagnetic steel sheets of a different grade than the rotor core 41, or from a non-magnetic material. If the end plates 7A and 7B are formed from a non-magnetic material, they will not interfere with the magnetic circuit.

[0037] As shown in Figure 5, the end plate 7A comprises a disc-shaped annular plate portion 71 and a cylindrical portion 72 projecting from the outer peripheral edge of the annular plate portion 71 toward the rotor core 41 in the axial direction Y. The end plate 7A and the end face of one end Y1 of the rotor 4 in the axial direction Y form an end channel 82A for connecting the first channel 83A and the first communication channel 81A. Furthermore, it is provided with a hole 77 (see Figure 4) for connecting the second channel 83B to the outside. In addition, an opening 71A is formed in the center of the annular plate portion 71, and the end plate 7A is fixed to the rotating shaft 3 by inserting the rotating shaft 3 through this opening 71A and fixing the annular plate portion 71 to the rotating shaft 3. It is also conceivable that fins, rectangular projections, arc-shaped projections, S-shaped projections, etc., may be formed on the surface of the annular plate portion 71 opposite to the rotor core 41.

[0038] The cylindrical portion 72, with its annular tip, abuts against the rotor core 41 of the rotor 4, thereby holding the laminated structure of the rotor core 41 in the axial direction Y. Similarly, the end plate 7B is formed, and the end flow channel 82A is formed by the end plate 7B and the end face of the other end Y2 in the axial direction Y of the rotor 4. In this way, since the end flow channel 82A is formed using end plates 7A and 7B, the number of types of electrical steel sheets required to form the rotor core 41 is reduced, resulting in lower costs, compared to the case where the end flow channel 82A is formed on the rotor core 41 as in Embodiment 1 above.

[0039] Next, the flow of refrigerant in the rotating electric machine 1 of Embodiment 2 configured as described above will be explained. In Figures 4 and 5, the flow of refrigerant is indicated by arrows. Also, the explanation of parts that are the same as in Embodiment 1 will be omitted as appropriate. As shown in Figures 4 and 5, similar to Embodiment 1, the refrigerant is introduced from the inlet 810 of the in-shaft flow path 81. Therefore, the refrigerant flows through the in-shaft flow path 81 from one end Y1 in the axial direction Y to the other end Y2.

[0040] Then, a portion of the refrigerant is branched off in a first communication channel 81A formed at one end Y1 of the axial Y of the internal shaft channel 81, and supplied to the first channel 83A via the end channel 82A. Therefore, the axial Y flow of the refrigerant in the first channel 83A is in the same direction as the axial Y flow of the refrigerant in the internal shaft channel 81. The refrigerant is then discharged to the outside of the rotor 4 from the other end Y2 of the axial Y of the first channel 83A through the hole 77 in the end plate 7B.

[0041] Furthermore, another portion of the refrigerant does not branch into the first communication channel 81A but flows through the internal shaft channel 81 to the other end Y2 in the axial direction Y, where it flows into the second communication channel 81B and is supplied to the second channel 83B via the end channel 82A. Therefore, the refrigerant flow in the axial direction Y of the second channel 83B is in the opposite direction to the refrigerant flow in the axial direction Y of the internal shaft channel 81. The refrigerant is then discharged to the outside of the rotor 4 from one end Y1 in the axial direction Y of the second channel 83B through the hole 77 in the end plate 7A. As a result, the axial flow of the refrigerant inside the rotor 4 is in the opposite direction to that of the first channel 83A and the second channel 83B, allowing the rotor 4 to be cooled efficiently and the temperature distribution inside the rotor 4 to be made uniform. Therefore, the maximum temperature of the rotor 4 can be reduced.

[0042] The rotating electric machine of Embodiment 2, configured as described above, provides the same effects as Embodiment 1, The rotor is provided with end plates on one axial end and the other end, The end plate and the axial end face of the rotor form an internal axial flow path and an end flow path that connects to the first flow path and the second flow path, The end plates allow for connection between the in-shaft flow path and the first and second flow paths without complicating the rotor core configuration.

[0043] Embodiment 3. In the embodiments described above, examples were shown in which refrigerant is discharged to the outside of the rotor 4 from both ends of the first flow path 83A and the second flow path 83B in the axial direction Y. However, in this embodiment 3, we will describe the case in which refrigerant is discharged radially outward X1 from the outer circumferential surface of the rotor 4 toward the stator 5, and further, the case in which multiple first flow paths 83A and second flow paths 83B are formed.

[0044] Figure 6 is a cross-sectional view showing the configuration of a rotating electric machine according to Embodiment 3. Figure 7 is a plan view showing the positional relationship between each flow path, magnet and flux barrier of the rotor of the rotating electric machine shown in Figure 6. Figure 8 is a plan view showing the configuration of the end plate on one axial end of the rotating electric machine shown in Figure 6 and its relationship to each flow path. Figure 9 is a plan view showing the configuration of the end plate on the other axial end of the rotating electric machine shown in Figure 6 and its relationship to each flow path.

[0045] In addition, parts that are the same as those in the above embodiments are denoted by the same reference numerals and their descriptions are omitted. Also, in Figures 7 to 9, the locations indicated by "+" are the locations where the first flow path 83A is formed, and the locations indicated by "◎" are the locations where the second flow path 83B is formed. Note that the notations "+" and "◎" in the figures are the same in the following embodiments as well, so their explanations are omitted as appropriate. In Figure 8, the refrigerant in the first flow path 83A, indicated by "+", flows from the front to the back of the page, and the refrigerant in the second flow path 83B, indicated by "◎", flows in the opposite direction, from the back to the front of the page. Also, in Figure 9, the refrigerant in the first flow path 83A, indicated by "+", flows from the back to the front of the page, and the refrigerant in the second flow path 83B, indicated by "◎", flows in the opposite direction, from the front to the back of the page.

[0046] As shown in Figure 7, multiple first flow channels 83A and multiple second flow channels 83B are formed. The distance W1 from the first flow channel 83A to the central axis Q of the rotor 4 and the distance W2 from the second flow channel 83B to the central axis Q of the rotor 4 are formed to be the same distance. Furthermore, the first flow channels 83A and the second flow channels 83B are arranged alternately in the circumferential direction Z. In addition, the cross-sectional area of ​​the cross section perpendicular to the axial direction Y of the first flow channel 83A and the second flow channel 83B is formed to be the same.

[0047] Furthermore, while the example shows the first channel 83A and the second channel 83B being formed at approximately equal intervals of 90° pitch in the circumferential direction Z, the method is not limited to this. For example, the approximately equal intervals could be 120°, 72°, 60°, 45°, or 36°. Unequal intervals are also acceptable, and the formation positions can be appropriately changed depending on the configuration of the rotor 4.

[0048] As shown in Figure 8, the end plate 7A on one end side Y1 in the axial direction Y is provided with an isolation wall 74 and a hole 75. The end plate 7A and the end face on one end side Y1 in the axial direction Y of the rotor 4 form an end passage 82A that connects the first passage 83A and the first communication passage 81A, which rectify the flow of the refrigerant, and an ejection passage 82C that is connected to the second passage 83B and extends to a hole 75 formed through the outer side X1 in the radial direction X of the rotor 4. A portion 73 is formed that is not part of each passage 82A or 82C. Furthermore, the ejection passage 82C is formed such that the cross-sectional area of ​​the passage decreases from the inner side X2 to the outer side X1 in the radial direction X of the rotor 4. This is to increase the flow velocity of the refrigerant ejected from the ejection passage 82C, which will be described later.

[0049] As shown in Figure 9, the end plate 7B on the other end Y2 in the axial direction Y is provided with an isolation wall 74 and a hole 75. The end plate 7B and the end face Y2 on the other end Y2 of the rotor 4 form an end passage 82A that connects the second passage 83B and the second communication passage 81B, which rectify the flow of the refrigerant, and an ejection passage 82C that is connected to the second passage 83B and leads to a hole 75 formed that penetrates the outer side X1 in the radial direction X of the rotor 4. A portion 73 is formed that does not consist of these passages 82A and 82C.

[0050] In addition, the end channel 82A and the ejection channel 82C are formed at approximately 90° intervals in the circumferential direction Z, corresponding to the formation positions of the first channel 83A and the second channel 83B. However, the formation is not limited to this, and can be appropriately formed according to the formation positions of the first channel 83A and the second channel 83. Furthermore, the shape of the end channel 82A is not limited to the shape shown in Figures 8 and 9, and can be formed in a similar manner, for example, a roughly straight shape, an arc shape, or a helical shape.

[0051] Furthermore, it is possible to apply seals to each end plate 7A and 7B to prevent refrigerant leakage from areas other than the ejection passage 82C. In addition, since each end plate 7A and 7B has a hollow structure, the respective passages 82A and 82C are formed by isolation walls 74 and holes 75, allowing for weight reduction. Also, as shown in Figures 8 and 9, each end plate 7A and 7B is formed in the same shape.

[0052] Furthermore, by appropriately installing end plates 7A and 7B of the same shape, changing the installation angle in the circumferential direction Z as shown in Figures 8 and 9, each flow path 82A and 82C can be formed, thereby reducing manufacturing costs. Also, although Figures 8 and 9 show an example in which the shape of the ejection flow path 82C is formed in an axisymmetric shape, it is not limited to this, and an axisymmetric shape may also be used. In addition, although the orientation of the ejection hole of the ejection flow path 82C is shown as being formed approximately along the radial direction X on the outside X1 in the radial direction X, it is not limited to this, and for example, it may be formed inclined in the rotational direction or the counter-rotational direction.

[0053] Next, the flow of refrigerant in the rotating electric machine 1 of Embodiment 3 configured as described above will be explained. In Figures 6, 8, and 9, the flow of refrigerant is indicated by arrows. Also, the explanation of parts that are the same as in the above embodiments will be omitted as appropriate. Similar to the above embodiments, the refrigerant is introduced from the inlet 810 of the in-shaft flow path 81, and a portion of the refrigerant is supplied to the first flow path 83A via the first communication flow path 81A and the end flow path 82A of the in-shaft flow path 81.

[0054] The refrigerant that has reached the other end Y2 of the first flow path 83A from one end Y1 in the axial direction Y is then blown out from the ejection flow path 82C of the end plate 7B to the outside X1 in the radial direction X of the rotor 4 by the centrifugal force of the rotor 4. Since the coil end portion, which is the part of the coil 51 that generates the most heat, is located at this point, the refrigerant blown out by the centrifugal force of the rotor 4 is blown onto the coil end portion of the coil 51 and cooled.

[0055] Furthermore, another portion of the refrigerant flows from the other end Y2 in the axial direction Y of the internal shaft passage 81 into the second communication passage 81B, and is supplied to the second passage 83B via the end passage 82A. The refrigerant that reaches the one end Y1 from the other end Y2 in the axial direction Y of the second passage 83B is then blown out by the centrifugal force of the rotor 4 from the ejection passage 82C of the end plate 7A to the outside X1 in the radial direction X of the rotor 4. Since the coil end portion of the coil 51 of the stator 5 is located at this point, the refrigerant blown out by the centrifugal force of the rotor 4 is blown onto the coil end portion of the coil 51 and cooled.

[0056] Furthermore, the axial Y ends of the magnets 42 and the axial Y ends of the rotor core 41, which are located in a vicinity that can contact or cool the respective flow paths 82A and 82C of the end plate 7A or the end plate 7B, are cooled by the coolant flowing through these respective flow paths 82A and 82C.

[0057] Furthermore, as shown in Figure 7, since the first flow path 83A and the second flow path 83B are arranged in an annular shape in the circumferential direction Z at the end face of the rotor 4, the magnet 42 and the rotor core 41 around it can be cooled even more efficiently. In addition to cooling the rotor 4, the coil end portions of the coil 52 can also be cooled, making it possible to efficiently cool the stator 5. Moreover, since the first flow path 83A and the second flow path 83B are arranged alternately in the circumferential direction Z, the locations where the ejection flow path 82C is formed are evenly formed in the circumferential direction Z on both sides of the axial direction Y, one end Y1 and the other end Y2.

[0058] Therefore, on both sides of the axial direction Y, Y1 at one end and Y2 at the other end, the refrigerant is discharged evenly in the circumferential direction Z. In particular, even when the rotor 4 is rotating at zero speed, that is, when the position of the ejection passage 82C in the circumferential direction Z is not easily moved by rotation, the refrigerant is ejected from the ejection passage 82C, which is evenly arranged in the circumferential direction Z, to the coil end portion of the stator 5. As a result, the coil end portion of the stator 5 can be cooled evenly, the temperature distribution in the circumferential direction Z becomes uniform, and the cooling performance can be improved.

[0059] Furthermore, in order to ensure efficient cooling even when the rotor 4 is rotating in the opposite direction, at least one of the ejection channels 82C may be formed so that it ejects in a different direction. For example, at least one of the ejection channels 82C may have a different angle between its ejection direction and the tangential direction of the outer circumference.

[0060] In the above embodiment 3, as shown in Figure 7, an example is shown in which one first channel 83A and one second channel 83B are alternately arranged in the circumferential direction Z. However, the invention is not limited to this, and for example, as shown in Figure 10, multiple channels, for example two first channels 83A and multiple channels, for example two second channels 83B, may be alternately arranged in the circumferential direction Z.

[0061] The rotating electric machine of Embodiment 3, configured as described above, provides the same effects as the above embodiments, Since the rotor is provided with ejection channels at both axial ends that are connected to at least one of the first channel or the second channel, and that extend radially outward from the rotor and connect to the outside, The refrigerant is injected into the stator, allowing for stator cooling as well.

[0062] Furthermore, according to the rotating electric machine of Embodiment 3 configured as described above, The rotor is provided with end plates on one end and the other end in the axial direction, The first and second flow channels are formed to penetrate the rotor in the axial direction, The end plate has a partition wall and a hole, The refrigerant is rectified between the end plate and the axial end face of the rotor, The refrigerant can be rectified to each flow path and to the outside with a simple configuration.

[0063] Furthermore, according to the rotating electric machine of the above embodiment 3, The end plates on one end and the other end in the axial direction are formed to have the same shape. The circumferential installation angles of the end plates on one end and the other end in the axial direction are changed during installation. An end channel is formed by one of the end plates and the end face on one axial end of the rotor, connecting the first communication channel and the first channel. The other end plate and the end face on the other end of the rotor in the axial direction form an end passage that connects the second communication passage and the second passage, Since the end plates at both ends in the axial direction can be formed with the same shape, processing costs can be reduced.

[0064] Furthermore, according to the rotating electric machine of the above embodiment 3, Multiple first channels and multiple second channels are formed, The formation positions of the first channel and the second channel are, Since the distance from the central axis of rotation of the rotor is the same, and the first flow path and the second flow path are formed alternately in the circumferential direction, This allows for a more uniform temperature distribution around the rotor.

[0065] Embodiment 4. In the embodiments described above, there are no particular limitations on the difference in the heat transfer capacity (hereinafter referred to as cooling capacity) of the first flow path 83A and the second flow path 83B to the refrigerant, nor on their arrangement based on that capacity. However, in Embodiment 4, these will be explained. Figure 11 is a plan view showing the configuration of the rotor of a rotating electric machine according to Embodiment 4. In the figure, parts that are the same as in the embodiments described above are denoted by the same reference numerals and their descriptions are omitted.

[0066] In this embodiment 4, the cross-sectional area of ​​the first channel 83A perpendicular to the axial direction Y is formed to be larger than the cross-sectional area of ​​the second channel 83B perpendicular to the axial direction Y. As a result, the flow rate of the refrigerant flowing through the first channel 83A is greater than the flow rate of the refrigerant flowing through the second channel 83B. Therefore, the cooling capacity of the first channel 83A is greater than that of the second channel 83B. The magnets 42 are arranged alternately in the circumferential direction Z, with magnets 42A and 42B of different sizes. The size of magnet 42A is larger than the size of magnet 42B. As a result, the amount of heat generated by magnet 42A is greater than that generated by magnet 42B. The first channel 83A is placed near magnet 42A, which generates more heat, and the second channel 83B is placed near magnet 42B, which generates less heat.

[0067] In the rotating electric machine of Embodiment 4 configured as described above, the first flow path 83A and the second flow path 83B, each having a different cross-sectional area perpendicular to the axial direction Y, are appropriately installed to correspond to the heat generated by the magnets 42A and 42B. As a result, the rotor 4 can be cooled more efficiently, and the temperature distribution within the rotor 4 can be made more uniform. Therefore, the maximum temperature of the rotor 4 can be further reduced.

[0068] In the above embodiment 4, the difference in cooling capacity is obtained by making the cross-sectional area of ​​the first channel 83A perpendicular to the axial direction Y larger than the cross-sectional area of ​​the second channel 83B perpendicular to the axial direction Y. However, the invention is not limited to this, and for example, the surface area of ​​the first channel 83A may be increased by providing fine protrusions on the surface of the first channel 83A, thereby improving the cooling capacity.

[0069] Furthermore, the cooling capacity may be improved by reducing the thermal resistance caused by the surface treatment by making the surface treatment of the first channel 83A thinner than that of the second channel 83B. Alternatively, the cooling capacity may be improved by creating turbulent flow within the channel by providing a protruding shape in the first channel 83A that affects the flow of the refrigerant. By forming it in this way, areas with high heat generation can be cooled efficiently, and the temperature distribution within the rotor 4 can be made even more uniform.

[0070] Furthermore, as shown in Figure 12, it is also possible to form a first channel 83A and a second channel 83B between the magnets 42 in the circumferential direction Z.

[0071] The rotating electric machine of Embodiment 4, configured as described above, provides the same effects as the above embodiments, The first flow channel is formed at a location in the heat distribution of the rotor where heat generation is greater than that at the location of the second flow channel. The heat transfer capacity of the first channel to the refrigerant is formed to be greater than the heat transfer capacity of the second channel to the refrigerant. Because the areas of the rotor that generate the most heat can be cooled efficiently, the cooling efficiency of the rotor is further improved, and the temperature distribution within the rotor can be made more uniform. As a result, the maximum temperature of the rotating electric machine can be further reduced. Therefore, it is possible to achieve further miniaturization and higher output of the rotating electric machine as a whole.

[0072] Embodiment 5. In the embodiments described above, examples were shown in which the first flow path 83A and the second flow path 83B are formed on the same circumference (equal distance from the central axis Q). However, the invention is not limited to this, and a case in which the first flow path 83A and the second flow path 83B are formed on different circumferences (different distances from the central axis Q) will be described. Figures 13, 14, and 15 are plan views showing the configuration of the rotor of a rotating electric machine according to Embodiment 5. Here, an example is shown in which the cooling performance of the first flow path 83A is higher than that of the second flow path 83B. In the figures, parts that are the same as in the embodiments described above are denoted by the same reference numerals and their descriptions are omitted.

[0073] As shown in Figure 13, the first flow path 83A and the second flow path 83B are formed at positions where the distance W3 from the first flow path 83A to the central axis Q of the rotor 4 is longer than the distance W4 from the second flow path 83B to the central axis Q of the rotor 4. Furthermore, the first flow path 83A and the second flow path 83B are formed at positions that sandwich the magnet 42 in the radial direction X. That is, the formation position of the first flow path 83A is positioned X1 further outward in the radial direction X of the rotor 4 than the formation position of the second flow path 83B. By forming them in this way, the heat generated due to eddy loss that occurs in large quantities on the outer circumference of the rotor 4 can be actively cooled, and the cooling performance of the outer circumference of the rotor 4 can be further improved.

[0074] As another example, as shown in Figure 14, the formation positions of the first flow path 83A and the second flow path 83B are such that the distance W5 from the first flow path 83A to the central axis Q of the rotor 4 is longer than the distance W6 from the second flow path 83B to the central axis Q of the rotor 4. In other words, the formation position of the first flow path 83A is located X1 further outward in the radial direction X of the rotor 4 than the formation position of the second flow path 83B.

[0075] As another example, as shown in Figure 15, the formation positions of the first flow path 83A and the second flow path 83B are such that the distance W7 from the first flow path 83A to the central axis Q of the rotor 4 is longer than the distance W8 from the second flow path 83B to the central axis Q of the rotor 4. In other words, the formation position of the first flow path 83A is located X1 further outward in the radial direction X of the rotor 4 than the formation position of the second flow path 83B.

[0076] In particular, as shown in Figures 14 and 15, the second flow path 83B is located near the rotating shaft 3, that is, the position where the second flow path 83B is formed is such that when the rotating electric machine 1 is unpowered or at maximum torque, the magnetic flux density is lower than that of the position where the first flow path 83A is formed, and is 0.1 [T] or less. In this way, by arranging the second flow path 83B, which has lower cooling performance than the first flow path 83A, on the inside X2 in the radial direction X as shown in Figures 14 and 15, interference with the magnetic circuit can be reduced, and the cooling performance can be improved without degrading the electromagnetic performance of the rotating electric machine 1.

[0077] The rotating electric machine of Embodiment 5, configured as described above, provides the same effects as the above embodiments, Since the formation position of the first flow channel is radially outward of the rotor than the formation position of the second flow channel, This allows for efficient cooling of the radially outer side of the rotor, where eddy losses are most significant.

[0078] Furthermore, the rotating electric machine of Embodiment 5 configured as described above provides the same effects as those of each of the embodiments described above, The formation positions of the first channel and the second channel are, Since the distance between the first channel and the magnet is shorter than the distance between the second channel and the magnet, This allows for efficient cooling of the magnets, which are both a heat source for the rotor and whose temperature needs to be reduced.

[0079] Furthermore, according to the rotating electric machine of embodiment 5 configured as described above, The formation positions of the first and second flow channels are such that, when the rotating electric machine is unpowered or at maximum torque, the magnetic flux density of the second flow channel is lower than that of the first flow channel. By positioning the second flow path, which has a lower cooling capacity than the first flow path, radially inward, interference with the magnetic circuit can be reduced, and the cooling efficiency of the rotor can be improved without degrading the electromagnetic performance of the rotating electric machine.

[0080] Embodiment 6. In the embodiments described above, examples are shown in which the first flow path 83A and the second flow path 83B are not in communication with the end plates 7A and 7B and the axial Y end face of the rotor 4. However, the embodiments are not limited to this, and in Embodiment 6, an example in which the first flow path and the second flow path are in communication will be described. Figures 16 and 17 are plan views showing the configuration of the end plates of the rotor of the rotating electric machine according to Embodiment 6. In the figures, parts that are the same as in the embodiments described above are denoted by the same reference numerals and their description is omitted.

[0081] As shown in Figure 16, the end plate 7A and the end face Y1 on one end side Y1 of the rotor 4 in the axial direction Y provide a third communicating passage 82B that extends in the circumferential direction Z and connects the first passage 83A and the second passage 83B. The end plate 7B is similarly formed by the end face Y2 on the other end side Y in the axial direction Y of the rotor 4.

[0082] As another example, as shown in Figure 17, the rotor 4 is provided with a third communicating passage 82B that extends radially in the X direction and connects the first passage 83A and the second passage 83B, formed by the end plate 7A and the end face Y1 on one end side Y1 of the rotor 4 in the axial direction Y. The end plate 7B is similarly formed by the end face Y2 on the other end side Y2 of the rotor 4 in the axial direction Y. In Figures 16 and 17, the refrigerant in the first channel 83A, marked with "+", flows from the front to the back of the page, while the refrigerant in the second channel 83B, marked with "◎", flows in the opposite direction, from the back to the front of the page.

[0083] As shown in each figure, the refrigerant may pass through the first flow path 83A and the second flow path 83B at least once each, or it may pass through the first flow path 83A and the second flow path 83B multiple times. Finally, the refrigerant is discharged outside the rotor 4 through the ejection flow path 82C. Furthermore, the shape of the third communication flow path 82B is not limited to the shape shown in Figures 16 and 17, and can similarly be formed into, for example, a substantially straight shape, an arc shape, or a helical shape.

[0084] The rotating electric machine of Embodiment 6 configured as described above provides the same effects as the above embodiments, The end plate is provided with a third connecting channel that connects the first channel and the second channel, The first and second flow paths can be connected at the axial end of the rotor.

[0085] Embodiment 7. This embodiment 7 describes a case in which the flow rate distribution of the refrigerant between the first flow path 83A and the second flow path 83B is made uniform. Figure 18 is a cross-sectional view showing the configuration of the rotating electric machine according to embodiment 7. Figure 19 is a plan view showing the configuration of the end plate on the other axial end shown in Figure 18. In the figures, parts that are the same as those in the above embodiments are denoted by the same reference numerals and their description is omitted.

[0086] As shown in Figure 18, the width W9 in the axial direction Y of the first connecting channel 81AA is formed to be smaller than the width W10 in the axial direction Y of the second connecting channel 81BB, so that the cross-sectional area of ​​the first connecting channel 81AA is smaller than the cross-sectional area of ​​the second connecting channel 81BB. Furthermore, the end plate 7A on one end Y1 in the axial direction Y is installed as shown in Figure 8. The end plate 7B on the other end Y2 in the axial direction Y is installed as shown in Figure 19.

[0087] As shown in Figure 19, the end plate 7B is positioned to block a portion of the outlet of the first flow path 83A with a portion 73 that does not become a flow path 82A or 82C (this is portion D shown in Figure 19), thereby suppressing outflow from the first flow path 83A to the ejection flow path 82C. Also, in Figure 19, the refrigerant in the first flow path 83A, marked with "+", flows from the back to the front of the page, while the refrigerant in the second flow path 83B, marked with "◎", flows in the opposite direction, from the front to the back of the page.

[0088] By forming it in this way, it becomes possible to bring closer together the pressure loss of the refrigerant ejected from the first communication channel 81AA through the first channel 83A, from one end Y1 to the other end Y2 in the axial direction Y of the first channel 83A, and further to the pressure loss of the refrigerant ejected to the outside from the ejection channel 82C of the end plate 7B, and from the second communication channel 81BB through the second channel 83B, from the other end Y2 to the one end Y1 in the axial direction Y of the second channel 83B, and further to the pressure loss of the refrigerant ejected to the outside from the ejection channel 82C of the end plate 7A. This makes it possible to equalize the flow rate distribution of the refrigerant between the first channel 83A and the second channel 83B, and to make the temperature distribution inside the rotor 4 uniform.

[0089] The rotating electric machine of Embodiment 7 configured as described above provides the same effects as the above embodiments, The internal shaft passage has a refrigerant inlet on one end of the rotating shaft in the axial direction, The cross-sectional area of ​​the first connecting channel is made smaller than the cross-sectional area of ​​the second connecting channel, The end plate, together with the axial end face of the rotor, forms an ejection channel that extends radially outward from the rotor and connects to the outside. The end plate on the other end in the axial direction is positioned so as to cover a portion of the first flow path at the edge of the ejection flow path. The end plate on one end in the axial direction is positioned so as not to cover the second flow path at the edge of the ejection flow path, By equalizing the pressure loss in the first and second flow paths and equalizing the flow rate distribution, the temperature distribution within the rotor can be made uniform.

[0090] Embodiment 8. Figure 20 shows the configuration of the rotating electric machine unit according to Embodiment 8. In the figure, parts that are the same as those in each of the above embodiments are denoted by the same reference numerals and their descriptions are omitted. As shown in Figure 20, the rotating electric machine unit 101 is equipped with a gear 12 connected to the rotating shaft 3, which is the output shaft of the rotating electric machine 1, at the other end Y2 in the axial direction Y, opposite to the inlet 810 of the internal shaft flow path 81.

[0091] By configuring the rotating electric unit 101 in this way and installing the gear 12 at the designated location, it can be installed regardless of the refrigerant flow path, and the assembly and structure can be simplified.

[0092] The rotating electric machine of Embodiment 8 configured as described above provides the same effects as the above embodiments, In a rotating electric machine unit in which a gear is connected to the rotating shaft of the rotating electric machine described above, Since the gear is installed on the other axial end opposite to the axial end where the coolant is introduced into the internal shaft passage, The assembly and structure of the rotating electric machine unit can be simplified, and complex configurations can be avoided.

[0093] Furthermore, the flow of the refrigerant is not limited to the cases shown in the above embodiments; for example, it is also conceivable to flow through each channel in the order shown below. As an example, the fluid may flow from the internal shaft channel 81 through the first connecting channel 81A and the end channel 82A to the first channel 83A, then through the third connecting channel 82B to the second channel 83B in series, and then out through the ejection channel 82C. Alternatively, the fluid may flow from the internal shaft channel 81 through the second connecting channel 81B and the end channel 82A to the second channel 83B, then through the third connecting channel 82B to the first channel 83A in series, and then out through the ejection channel 82C.

[0094] As an example, the refrigerant may flow from the internal shaft passage 81 through the first connecting passage 81A and the end passage 82A to the first passage 83A, then branch into the third connecting passage 82B and the discharge passage 82C, with some of the refrigerant flowing out from the discharge passage 82C, and the refrigerant that flowed into the third connecting passage 82B flowing into the second passage 83B and then flowing out from the discharge passage 82C.

[0095] As an example 3, the refrigerant may flow from the internal shaft channel 81 through the first connecting channel 81A and the end channel 82A, then through the first channel 83A, before branching into the third connecting channel 82B and the ejection channel 82C, with some of the refrigerant flowing out from the ejection channel 82C, the refrigerant that flowed into the third connecting channel 82B flowing into the second channel 83B and then flowing out from the ejection channel 82C, or the refrigerant may flow from the internal shaft channel 81 through the second connecting channel 81B and the end channel 82A, then through the second channel 83B, and then flow out from the ejection channel 82C.

[0096] The above-described refrigerant flow is just one example; other configurations are also possible as long as the flow directions of the first flow path 83A and the second flow path 83B are opposite in the axial direction Y of the refrigerant, and the same effects as those of each of the above embodiments can be achieved.

[0097] Although this application describes various exemplary embodiments and examples, the various features, aspects, and functions described in one or more embodiments are not limited to the application of a particular embodiment, but are applicable individually or in various combinations to the embodiments. Accordingly, countless variations not illustrated are conceivable within the scope of the art disclosed herein. These include, for example, modifying, adding or omitting at least one component, or even extracting at least one component and combining it with components of other embodiments. [Explanation of Symbols]

[0098] 1 Rotating electric machine, 100 Fan, 101 Rotating electric machine unit, 11 Bearing, 12 Gear, 2 Housing, 3 Rotating shaft, 4 Rotor, 41 Rotor core, 42 Magnet, 43 Flux barrier, 5 Stator, 51 Coil, 7A End plate, 7B End plate, 71 Annular plate section, 71A Opening, 73 Non-flow channel section, 74 Isolation wall, 75 Hole section, 77 Hole section, 81 In-shaft flow channel, 810 Inlet, 81A First communication channel, 81AA First communication channel, 81B Second communication channel, 81BB Second communication channel, 82A End channel, 82B Third communication channel, 82C Ejection channel, 83A First channel, 83B Second channel, Q Central axis, W1 Distance, W2 Distance, W3 Distance, W4 Distance, W5 Distance, W6 Distance, W7 distance, W8 distance, W9 width, W10 width, X radial direction, X1 outside, X2 inside, Y axis direction, Y1 one end side, Y2 other end side, Z circumferential direction.

Claims

1. The axis of rotation and A rotor having a magnet is fixed to the outer circumference of the aforementioned rotating shaft, In a rotating electric machine comprising a stator installed on the outer circumference of the rotor, The magnet is formed extending from one end to the other end in the axial direction of the rotor. The rotor comprises a first flow path and a second flow path for circulating refrigerant, which extend from one end to the other end in the axial direction of the rotor. At least one of the first channel and the second channel is formed along the magnet, The first flow path and the second flow path have opposite directions in which the refrigerant flows axially. The aforementioned rotating shaft is Within the rotating shaft, an internal shaft passage for flowing the refrigerant extends from one end to the other end in the axial direction of the rotor, A first communication channel that communicates with the first channel from one end of the axial channel in the shaft, The system includes a second communicating passage that communicates with the second passage from the other axial end of the aforementioned internal shaft passage, The internal shaft passage has a refrigerant inlet on one end of the rotating shaft in the axial direction, The cross-sectional area of ​​the first connecting channel is made smaller than the cross-sectional area of ​​the second connecting channel. Rotating electric machine.

2. The rotating electric machine according to claim 1, further comprising ejection channels at both axial ends of the rotor, connected to at least one of the first channel or the second channel, and extending radially outward from the rotor and connected to the outside.

3. The rotor is provided with end plates on one end and the other end in the axial direction, The first and second flow channels are formed to penetrate the rotor in the axial direction, The end plate has a partition wall and a hole, The rotating electric machine according to claim 1, wherein the refrigerant is rectified between the end plate and the axial end face of the rotor.

4. The end plates on one end and the other end in the axial direction are formed to have the same shape. The circumferential installation angles of the end plates on one end and the other end in the axial direction are changed during installation. An end channel is formed by one of the end plates and the end face on one axial end of the rotor, connecting the first communication channel and the first channel. The rotating electric machine according to claim 3, wherein the other end plate and the end face on the other end side in the axial direction of the rotor form an end passage connecting the second communication passage and the second passage.

5. The rotating electric machine according to claim 3, wherein the end plate, together with the axial end face of the rotor, forms a third communicating passage that connects the first passage and the second passage.

6. Multiple first channels and multiple second channels are formed, The formation positions of the first channel and the second channel are, The rotating electric machine according to claim 1, wherein the distance from the central axis of rotation of the rotor is the same, and the first flow path and the second flow path are formed alternately in the circumferential direction.

7. The end plate, together with the axial end face of the rotor, forms an ejection channel that extends radially outward from the rotor and connects to the outside, The end plate on the other end in the axial direction is positioned so as to cover a portion of the first flow path at the edge of the ejection flow path. The rotating electric machine according to claim 3, wherein the end plate on one end in the axial direction is arranged such that it does not cover the second flow path with the edge of the ejection flow path.

8. The first flow channel is formed at a location in the heat distribution of the rotor where heat generation is greater than that at the location of the second flow channel. The rotating electric machine according to claim 1, wherein the heat transfer capacity of the first channel to the refrigerant is formed to be greater than the heat transfer capacity of the second channel to the refrigerant.

9. The rotating electric machine according to claim 8, wherein the position where the first flow channel is formed is radially outward of the rotor than the position where the second flow channel is formed.

10. The formation positions of the first channel and the second channel are, The rotating electric machine according to claim 8, wherein the distance between the first flow path and the magnet is shorter than the distance between the second flow path and the magnet.

11. A rotating shaft and, A rotor having a magnet is fixed to the outer circumference of the aforementioned rotating shaft, In a rotating electric machine comprising a stator installed on the outer circumference of the rotor, The magnet is formed extending from one end to the other end in the axial direction of the rotor. The rotor comprises a first flow path and a second flow path for circulating refrigerant, which extend from one end to the other end in the axial direction of the rotor. At least one of the first channel and the second channel is formed along the magnet, The first flow path and the second flow path have opposite directions in which the refrigerant flows axially. The aforementioned rotating shaft is Within the rotating shaft, an internal shaft passage for flowing the refrigerant extends from one end to the other end in the axial direction of the rotor, A first communication channel that communicates with the first channel from one end of the axial channel in the shaft, A second communication channel that communicates with the second channel from the other axial end of the aforementioned internal channel, The rotor is provided with end plates on one end and the other end in the axial direction, The aforementioned end plate is Between the end plate and the axial end face of the rotor, Multiple flow paths through which the refrigerant is rectified, The multiple flow paths are separated from each other by isolation walls, Multiple first channels and multiple second channels are formed, The formation positions of the first channel and the second channel are, The distance from the central axis of rotation of the rotor is the same, The first channel and the second channel are formed alternately in the circumferential direction. One end plate, the end face on one axial end of the rotor, and the isolation wall, The first communication channel and the end channel connecting the first channel are separated and formed, and the ejection channel connected to the second channel extends radially outward from the rotor and connects to the outside, The other end plate, the end face on the other end of the rotor in the axial direction, and the separating wall, The second communication channel and the end channel connecting the second channel are separated and formed into an end channel that connects to the first channel and extends radially outward from the rotor, connecting to the outside. The end channel formed by one of the end plates, the end face on one axial end of the rotor, and the isolation wall is Multiple first flow channels are provided in an integrated region that connects them to one another around the rotating shaft. The end flow path formed by the other end plate, the end face on the other end side in the axial direction of the rotor, and the isolation wall is Multiple second flow channels are provided in an integrated region that connects them to one another around the rotating shaft. The ejection channel is provided on the outer circumference side of the end channel, which is located in a region where the end plates of one and the other are integrated. A rotating electric machine provided corresponding to the formation positions of the first flow channel and the second flow channel, respectively.

12. Multiple pairs of magnets, each consisting of a plurality of magnets, are arranged at intervals in the circumferential direction. The plurality of first channels and the plurality of second channels are The total number of these magnets corresponds to the number of pairs of magnets. The rotating electric machine according to claim 11, wherein the formation positions of the plurality of first channels and the plurality of second channels are provided in a region sandwiched between the circumferential directions of the magnets constituting the pair of magnets.

13. The end channel and the ejection channel provided in one and the other end plates are: The rotating electric machine according to claim 12, provided in a region that partially overlaps with the axial ends of the plurality of magnets constituting a pair of the plurality of magnets.

14. The rotating electric machine according to claim 11, wherein the ejection channel is formed such that the channel cross-sectional area decreases as it moves from the inside to the outside in the radial direction.

15. In a rotating electric machine unit in which a gear is connected to the rotating shaft of the rotating electric machine according to any one of claims 1 to 14, The gear is a rotating electric machine unit installed on one axial end side of the shaft where the coolant is introduced into the internal flow path, and on the other axial end side opposite to the shaft.

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