Rotor

Abstract

To provide a technique of discharge a coolant having high cooling capability equally or at an arbitrary rate in both one side and the other side of an axial direction of a rotor.SOLUTION: A rotor 10 comprises a shaft 12 that extends in an axial direction and inside of which a coolant flows, a rotor core 20 that is fixed to the shaft 12, a first end plate 50 located on one side of an axial direction of the rotor core 20, and a second end plate 52 located on the other side of the axial direction of the rotor core 20. The rotor core 20 comprises a first flow channel 22a to be supposed to flow a coolant from the one side to the other side of the axial direction, a second flow channel 22d to be supposed to flow the coolant from the other side to the one side of the axial direction. The first end plate 50 comprises a first communication flow passage 54a to be supposed to flow the coolant from the shaft 12 to the first flow passage 22a, and the first main discharge flow passage 60a to be supposed to flow the coolant from the shaft 12 to the outside. The second end plate 52 comprises a second communication flow passage 54d to be supposed to flow the coolant from the shaft 12 to the second flow passage 22d, and a second main discharge flow passage 60d to be supposed to discharge the coolant from the shaft 12 to the outside.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The technology disclosed in this specification relates to a rotor.

Background Art

[0002] A rotor constitutes a motor together with a stator core to which a coil is fixed. The rotor core is a cylindrical body that holds magnets inside and has a rotor shaft at its center. Further, end plates are fixed to one side and the other side in the axial direction of the rotor core, respectively. When the motor operates, it is necessary to cool the coil ends extending axially from the magnets and the stator.

[0003] Conventionally, as a technology for cooling the magnets and the coil ends, refrigerant from the rotor shaft is supplied to the rotor core from one side in the axial direction of the rotor core through the end plate. At the same time, the refrigerant supplied through this end plate is directly discharged to the outside to cool the coil ends (Patent Document 1).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, according to such a cooling structure by the flow of refrigerant, on one side in the axial direction of the rotor core, the refrigerant supplied from the shaft is directly discharged. On the other side in the axial direction of the rotor core, the refrigerant that has passed through the rotor core is discharged through the end plate to the coil end disposed on the other side. That is, the temperature of the refrigerant reaching the coil ends is different between one side and the other side in the axial direction of the rotor core. For this reason, the other coil end could not be sufficiently cooled, and it was also impossible to cool one side and the other side uniformly in the axial direction.

[0006] This specification provides a technology for releasing a refrigerant with superior cooling performance in an equal or arbitrary proportion on one axial side and the other axial side of a rotor. [Means for solving the problem]

[0007] The technology disclosed herein is embodied in a rotor. The rotor comprises a shaft through which a refrigerant flows, a rotor core fixed to the shaft, a first end plate located on one axial side of the rotor core, and a second end plate located on the other axial side of the rotor core. The rotor core comprises a first passage for flowing the refrigerant from one axial side to the other axial side, and a second passage for flowing the refrigerant from the other axial side to the first axial side. The first end plate comprises a first connecting passage for flowing the refrigerant from the shaft to the first passage and a first main discharge passage for flowing the refrigerant from the shaft to the outside, and the second end plate comprises a second connecting passage for flowing the refrigerant from the shaft to the second passage and a second main discharge passage for discharging the refrigerant from the shaft to the outside.

[0008] According to the rotor disclosed herein, a first end plate located on one axial side of the rotor allows refrigerant from the shaft to flow in a direction from one axial side to the other axial side, and discharges it to the outside on the same axial side. A second end plate located on the other axial side of the rotor core allows refrigerant from the shaft to flow in a direction from the other axial side to the first axial side, and discharges it to the outside on the other axial side.

[0009] This allows the coolant that has not yet been heated to the outside to be discharged from one axial side and the other side of the rotor core, respectively, before it has passed through the flow path within the rotor core. In other words, a coolant with high cooling capacity can be discharged to the outside of the rotor core from both the axial side and the other side. As a result, for example, when the rotor is applied to a motor, the ends of the stator core of the motor on one axial side and the other side of the rotor core, particularly the coil ends, can be cooled evenly and effectively.

[0010] Furthermore, by adjusting the amount of refrigerant supplied to the first or second main discharge channel, the cooling capacity by the refrigerant on one axial side and the other side of the rotor core can be easily adjusted. As a result, for example, the cooling performance for the coil ends on one axial side and the other side of the rotor core can be easily adjusted. [Brief explanation of the drawing]

[0011] [Figure 1] This figure shows one embodiment of the rotor disclosed herein, together with a stator, and shows a cross-sectional view along the axial direction of the rotor core. [Figure 2] This figure shows a plan view (a) of the rotor core as seen from the X side, and a plan view (b) of the end plate fixed to the X side of the rotor core as seen from the X side. [Figure 3] Figure 1 shows a plan view of the rotor core as seen from the Y side (a) and a plan view of the end plate fixed to the Y side of the rotor core as seen from the Y side (b). [Modes for carrying out the invention]

[0012] The rotor of this disclosure comprises a shaft through which a refrigerant flows, a rotor core fixed to the shaft, a first end plate located on one axial side of the rotor core, and a second end plate located on the other axial side of the rotor core, wherein the rotor core comprises a first passage for flowing the refrigerant from one axial side to the other axial side, and a second passage for flowing the refrigerant from the other axial side to one axial side, the first end plate comprises a first connecting passage for flowing the refrigerant from the shaft to the first passage, and a first main discharge passage for flowing the refrigerant from the shaft to the outside, and the second end plate comprises a second connecting passage for flowing the refrigerant from the shaft to the second passage, and a second main discharge passage for discharging the refrigerant from the shaft to the outside.

[0013] In one embodiment of this disclosure, the first end plate may be provided with a branched first connecting passage and a first main discharge passage. The second end plate may also be provided with a branched second connecting passage and a second main discharge passage. This simplifies the structure of the refrigerant passages in the shaft and the end plates.

[0014] In this embodiment, the first connecting passage is a passage that receives refrigerant from the shaft and flows it into the first passage, and the first main discharge passage may be a passage that branches off from the first connecting passage. Also, the second connecting passage is a passage that receives refrigerant flowing out from the shaft and flows it into the second passage, and the second main discharge passage may be a passage that branches off from the second connecting passage. This simplifies the structure of the refrigerant passages in the shaft and the end plate.

[0015] Furthermore, in this embodiment, the first connecting passage may be configured such that the amount of refrigerant supplied to the first passage is greater than that supplied to the first main discharge passage, and the second connecting passage may be configured such that the amount of refrigerant supplied to the second passage is greater than that supplied to the second main discharge passage. This allows the rotor core to be sufficiently cooled.

[0016] In one embodiment of the present disclosure, the first main discharge passage may be a passage that discharges refrigerant from the shaft obliquely from the first end plate toward one axial direction toward the radially outer side of the rotor core. The second main discharge passage may also be a passage that discharges refrigerant from the shaft obliquely from the second end plate toward the other axial direction toward the radially outer side of the rotor core. This may make it easier for the refrigerant that has passed through the first and / or second main discharge passages to reach, for example, the coil ends of the stator positioned relative to the rotor.

[0017] In one embodiment of the present disclosure, the first end plate may be provided with a first secondary discharge channel for discharging refrigerant that reaches through the second flow channel. The second end plate may also be provided with a second secondary discharge channel for discharging refrigerant that reaches through the first flow channel. The refrigerant discharged through the first and second secondary discharge channels can improve or adjust the cooling capacity of the refrigerant on one and the other axial sides.

[0018] In one embodiment of the present disclosure, the rotor core may be provided with a plurality of first channels and a plurality of second channels alternately along the circumferential direction of the rotor core. This allows the rotor core to be cooled uniformly in the circumferential direction as well.

[0019] In one embodiment of this disclosure, the first end plate and the second end plate may have the same shape and be fixed to the rotor core at a predetermined angle offset around the rotation axis of the shaft. This reduces the number of parts and simplifies the manufacturing of the end plates, while enabling excellent cooling performance on both the axial side and the other side of the rotor core.

[0020] As one embodiment of the present disclosure, a motor is also provided that comprises a rotor and a stator according to any of the above embodiments.

[0021] Hereinafter, embodiments of the rotor of the present disclosure will be described with reference to the drawings as appropriate. In this specification, when simply referring to the "radial direction", it means the radial direction of the rotor core; when simply referring to the "circumferential direction", it means the circumferential direction of the rotor core; and when simply referring to the "axial direction", it means the axial direction of the rotor core.

[0022] FIG. 1 shows a cross-section along the axial direction of the rotor 10 according to this embodiment, together with the stator 4 that constitutes the motor 2 together with this rotor 10. In FIG. 1, a cross-section where the refrigerant flow paths 22a and 22d can be seen simultaneously is shown. FIG. 2 shows a combination of a plan view seen from one axial side (shown as the X side in FIG. 1; hereinafter, also simply referred to as the Y side) of the rotor core 20 that constitutes the rotor 10 shown in FIG. 1 and a plan view seen from the X side of the end plate 50 fixed to the X side of the rotor core 20. FIG. 3 shows a combination of a plan view seen from the other axial side (shown as the Y side in FIG. 1; hereinafter, also simply referred to as the Y side) of the rotor core 20 that constitutes the rotor shown in FIG. 1 and a plan view seen from the Y side of the end plate 52 fixed to the Y side.

[0023] The motor 2 intended in this specification includes various known motors. Although the form of the motor 2 is not limited, the motor 2 is, for example, a motor generator having functions as an electric motor or a generator. The motor 2 may, for example, constitute a drive source of a vehicle by itself or together with an internal combustion engine.

[0024] As shown in FIG. 1, the motor 2 includes a stator 4 and a rotor 10. The stator 4 has a stator core 6 and a coil 8. The stator core 6 has a cylindrical shape extending in the axial direction. The stator core 6 is disposed on the outer periphery of the rotor core 20 with a predetermined interval therebetween. The coil 8 is composed of a conductor having an insulating coating and is wound around the stator core 6. The coil 8 includes coil ends 8a and 8b that respectively protrude from the X side and the Y side to the X side and the Y side from the respective end faces of the X side and the Y side of the stator core 6.

[0025] The rotor 10 comprises a shaft 12, a rotor core 20, and end plates 50 and 52. The shaft 12 is rotatably supported about a rotation axis Z by bearings mounted on a housing (not shown) of the motor 2.

[0026] As shown in Figure 1, a refrigerant flow path 14 is formed inside the shaft 12, allowing the refrigerant to flow along its axial direction. The refrigerant is not particularly limited, but for example, a suitable oil can be used.

[0027] As shown in Figures 1 and 2(a), the shaft 12 is provided with refrigerant supply passages (hereinafter simply referred to as supply passages) 16a, 16b, and 16c at the fixed position of the end plate 50 on the X side. The supply passages 16a, 16b, and 16c are passages that extend radially outward from the refrigerant flow path 14 through the outer circumference of the shaft 12 toward the end plate 50. The supply passages 16a, 16b, and 16c are formed at predetermined intervals along the circumferential direction of the shaft 12.

[0028] As shown in Figures 1 and 3(a), the shaft 12 is equipped with supply passages 16d, 16e, and 16f at the fixed position of the end plate 52 on the Y side, just as on the X side. The supply passages 16d, 16e, and 16f are formed at predetermined intervals along the circumference of the shaft 12, but are offset from each other around the rotation axis Z by the supply passages 16a, 16b, and 16c, so that all the supply passages 16a to 16f are arranged at equal intervals around the rotation axis Z of the shaft 12.

[0029] The rotor core 20 is made of laminated steel sheets formed by stacking magnetic electromagnetic steel sheets, such as iron or an iron alloy, in the axial direction. The rotor core 20 is fixed to the shaft 12 through a central hole that penetrates the rotor core 20 in the axial direction.

[0030] As shown in Figures 2 and 3, the rotor core 20 is provided with refrigerant flow paths (hereinafter simply referred to as "flow paths") 22a, 22b, 22c, 22d, 22e, and 22f at predetermined positions radially outward from the central hole, through which the refrigerant flows at equal intervals along the circumferential direction.

[0031] The rotor core 20 further includes multiple magnet slots 30 and magnets 32 that penetrate axially, extending radially outward from the flow paths 22a to 22f and along the circumferential direction. Each magnet slot 30 houses a magnet (permanent magnet) 32.

[0032] The shape of the magnet 32 ​​is not particularly limited, but for example, it may be a columnar body with an elongated cross-section that extends in the axial direction of the rotor core 20. The magnet slot 30 is formed as a hole that extends in the axial direction and has an opening capable of accommodating the magnet 32. The magnet slot 30 may be a hole with a substantially elongated opening capable of accommodating the magnet 32 ​​with an elongated cross-section.

[0033] The arrangement pattern of the magnet slots 30 in the rotor core 20 is not particularly limited, but for example, they are arranged along the circumference of the rotor core 20 such that two magnets 32 form a pair to form one pole. The pair of magnets 32 are arranged in a roughly V-shape, symmetrically inclined toward the shaft 12 such that their opposing ends are closer together radially inward. The rotor core 20 has, for example, 6 to 8 poles formed on it.

[0034] For example, a magnet 32 ​​with an elongated cross-section is fixed by the long outer edge side surface on the radially outer side being pressed against the inner surface of the rotor core 20 that defines the radially outer inner surface of the magnet slot 30 (hereinafter, this inner surface is referred to as the radially outer inner surface of the magnet slot 30). As shown in Figures 2 and 3, the magnet slot 30 is provided with claw portions 40 for fixing the magnet 32. The claw portions 40 extend from the radially inner inner surface of the magnet slot 30 toward the long outer edge side surface on the radially inner side of the magnet 32, pressing and fixing the magnet 32 ​​against the radially outer surface of the rotor core 20. A suitable number of claw portions 40 may be provided along the axial direction in the gap formed axially on the inner surface between the magnet 32 ​​and the magnet slot 30.

[0035] As shown in Figure 1, end plates 50 and 52 are fixed to the X and Y end faces 20a and 20b of the rotor core 20. The end plates 50 and 52 are disc-shaped plates that clamp the rotor core 20. The end plates 50 and 52 are examples of the first and second end plates disclosed herein.

[0036] As shown in Figures 1 and 2(a), the end plate 50 is provided with connecting passages 54a, 54b, and 54c that connect the supply passages 16a, 16b, and 16c on the X side of the shaft 12 to the passages 22a, 22b, and 22c in the rotor core 20. The connecting passages 54a, 54b, and 54c are formed as groove-shaped portions extending radially outward on the end face 50a of the end plate 50 facing the end face 20a of the rotor core 20. The connecting passages 54a, 54b, and 54c allow the refrigerant supplied from the supply passages 16a, 16b, and 16c to reach the passages 22a, 22b, and 22c. The refrigerant then flows toward the Y side. Therefore, the passages 22a, 22b, and 22c are passages that allow the refrigerant to circulate within the rotor core 20 from the X side to the Y side. Flow channels 22a, 22b, and 22c are examples of first flow channels disclosed herein, and connecting flow channels 54a to 54c are examples of first connecting flow channels disclosed herein.

[0037] As shown in Figures 1 and 2(b), the connecting passages 54a, 54b, and 54c are provided with discharge passages 60a, 60b, and 60c that branch off from predetermined positions radially outward and not reaching the passages 22a, 22b, and 22c. The discharge passages 60a, 60b, and 60c are passages that discharge the refrigerant supplied via the connecting passages 54a, 54b, and 54c to the outside of the end plate 50. Within the end plate 50, the discharge passages 60a, 60b, and 60c have a flow path configuration that is radially outward from the branching point and obliquely directed toward the X side. The discharge passages 60a, 60b, and 60c have outlets 62a, 62b, and 62c at the X-side end face 50b of the end plate 50. The discharge passages 60a, 60b, and 60c are an example of the first main discharge passage in this specification.

[0038] The branching sections to the discharge passages 60a, 60b, and 60c are formed such that the amount of refrigerant supplied to the refrigerant passages 22a, 22b, and 22c is greater than the amount of refrigerant supplied to the discharge passages 60a, 60b, and 60c.

[0039] As shown in Figures 1 and 3(a), the end plate 52 is equipped with connecting passages 54d, 54e, and 54f that connect the supply passages 16d, 16e, and 16f on the Y side of the shaft 12 to the passages 22d, 22e, and 22f in the rotor core 20. The connecting passages 54d, 54e, and 54f are formed as groove-shaped portions extending radially outward on the end face 52a of the end plate 52 facing the end face 20b of the rotor core 20, allowing the refrigerant supplied from the supply passages 16d, 16e, and 16f to reach the passages 22d, 22e, and 22f. The refrigerant then flows toward the Y side. Therefore, the passages 22d, 22e, and 22f are passages that allow the refrigerant to circulate within the rotor core 20 from the X side to the Y side. Flow channels 22d, 22e, and 22f are examples of second flow channels disclosed herein, and connecting flow channels 54d, 54e, and 54f are examples of second connecting flow channels disclosed herein.

[0040] As shown in Figures 1 and 3(b), the connecting passages 54d, 54e, and 54f are equipped with discharge passages 60d, 60e, and 60f that branch off from predetermined positions radially outward and not reaching the passages 22d, 22e, and 22f. The discharge passages 60d, 60e, and 60f are passages that discharge the refrigerant supplied via the connecting passages 54d, 54e, and 54f to the outside of the end plate 52. Within the end plate 52, the discharge passages 60d, 60e, and 60f have a flow path configuration that is radially outward from the branching point and obliquely directed toward the Y side. The discharge passages 60d, 60e, and 60f have outlets 62d, 62e, and 62f at the Y-side end face 52b of the end plate 52. The branching sections to the discharge channels 60d, 60e, and 60f are formed such that the amount of refrigerant supplied to channels 22d, 22e, and 22f is greater than the amount of refrigerant supplied to the discharge channels 60d, 60e, and 60f. Discharge channels 60d, 60e, and 60f are examples of second main discharge channels as described herein.

[0041] Furthermore, as shown in Figures 1 and 2(b), the end plate 50 is equipped with discharge passages 70a, 70b, and 70c. The discharge passages 70a, 70b, and 70c are passages for discharging refrigerant that has arrived from the Y side of the rotor core 20 via passage 22d, etc., to the outside of the rotor core 20. These discharge passages 70a, 70b, and 70c have outlets 72a, 72b, and 72c that overlap axially with the openings of passages 22d, 22e, and 22f, and can penetrate the end plate 50 along the axial direction, allowing refrigerant to be discharged from the end face 50b.

[0042] Similarly, as shown in Figures 1 and 3(b), the end plate 52 is provided with discharge passages 70d, 70e, and 70f. The discharge passages 70d, 70e, and 70f are passages for discharging refrigerant that has arrived from the X side of the rotor core 20 via passage 22a, etc., to the outside of the rotor core 20. These discharge passages 70d, 70e, and 70f have outlets 72d, 72e, and 72f that overlap axially with the openings of passages 22a, 22b, and 22c, and can penetrate the end plate 52 along the axial direction, allowing refrigerant to be discharged from the end face 52b.

[0043] Next, the refrigerant flow pattern in the rotor 10 configured in this way will be explained with reference to Figures 1 and 2-3.

[0044] In Figure 1, arrows indicate the direction of refrigerant flow. As shown in Figure 1, refrigerant supplied from an oil source (not shown) flows from the flow path 14 of the shaft 12 into the supply paths 16a, 16b, and 16c on the X side. The refrigerant flows through the connecting flow paths 54a, 54b, and 54c of the end plate 50, and then through the flow paths 22a, 22b, and 22c on the Y side. Since the refrigerant is supplied from the shaft 12 and does not absorb heat, the rotor core 20 is effectively cooled.

[0045] On the X side, the refrigerant that flows into the connecting passages 54a, 54b, and 54c also flows into the discharge passages 60a, 60b, and 60c, and is discharged from the outlets 62a, 62b, and 62c opened at the end face 50b of the end plate 50, and is released towards the coil end 8a by the centrifugal force caused by the rotation of the rotor 10. Since the refrigerant does not absorb heat, the coil end 8a is effectively cooled.

[0046] On the X side, the refrigerant that has cooled the rotor core 20 by flowing through channels 22d, 22e, and 22f from the Y side reaches the end plate 50. The refrigerant that has flowed from the Y side and absorbed heat is discharged from outlets 72a, 72b, and 72c via discharge channels 70a, 70b, and 70c. The refrigerant is released to the coil end 8a by the centrifugal force caused by the rotation of the rotor 10. The refrigerant has already cooled the rotor core 20 and absorbed heat, but together with the refrigerant released from outlets 62a, 62b, and 62c, it cools the coil end 8a.

[0047] Furthermore, the branching sections to the discharge passages 60a, 60b, and 60c are configured such that the amount of refrigerant supplied to passages 22a, 22b, and 22c is greater than the amount of refrigerant supplied to the discharge passages 60a, 60b, and 60c, thereby effectively cooling the rotor core 20.

[0048] As shown in Figure 1, on the Y side of the rotor 10, coolant flows from the flow path 14 of the shaft 12 into the Y-side supply passages 16d, 16e, and 16f. The coolant flows through the connecting flow paths 54d, 54e, and 54f of the end plate 52, and then through the flow paths 22d, 22e, and 22f to the X side. The rotor core 20 is effectively cooled.

[0049] Similar to the X side, on the Y side, the refrigerant flows into the discharge channels 60d, 60e, and 60f, is discharged from the outlets 62d, 62e, and 62f opened at the end face 52b of the end plate 52, and is released towards the coil end 8b by centrifugal force. The coil end 8a is effectively cooled.

[0050] Similar to the X side, the refrigerant that has cooled the rotor core 20 by flowing through channels 22a, 22b, and 22c from the X side reaches the end plate 52. The refrigerant that has flowed from the X side and absorbed heat is discharged from outlets 72d, 72e, and 72f via discharge channels 70d, 70e, and 70f, and is released to the coil end 8b by centrifugal force. The refrigerant that has already cooled the rotor core 20 and absorbed heat, together with the refrigerant discharged from outlets 62d, 62e, and 62f, cools the coil end 8b.

[0051] As described above, the rotor 10 disclosed herein includes flow paths 22a, 22b, and 22c through which the coolant flows from the X side to the Y side of the rotor core 20, and flow paths 22d, 22e, and 22f through which the coolant flows from the Y side to the X side, thereby enabling effective and uniform cooling of the rotor core 20 along its entire axial direction.

[0052] Furthermore, since the rotor 10 can discharge refrigerant from the shaft 12 directly to the coil ends 8a and 8b from the end plates 50 and 52, the coil ends 8a and 8b can be cooled uniformly and effectively. Specifically, by aligning the flow direction of the refrigerant in the rotor core 20 with the axial direction, and supplying the unheated refrigerant supplied to the rotor core 20 to the coil ends 8a and 8b on the X and Y sides of the rotor core 20, the cooling performance for the coil ends 8a and 8b can be made uniform with a simple configuration. In addition, the amount of refrigerant supplied to the discharge passage 70a, etc., can be easily increased or decreased by adjusting the inner diameter of the discharge passage 70a, etc. Therefore, the cooling capacity for the coil ends 8a and 8b can be adjusted as needed. In particular, it is easy to increase the cooling capacity for the coil ends 8a and 8b.

[0053] Furthermore, by forming the end plates 50 and 52 with the same shape on the X and Y sides of the rotor core 20 and offsetting them by a predetermined angle around the rotation axis Z, the rotor core 20 and coil ends 8a and 8b can be easily and uniformly cooled.

[0054] In the embodiments described above, the rotor 10 has been the main focus, but according to the above disclosure, a motor equipped with such a rotor 10 is also one embodiment of the present disclosure.

[0055] In the above embodiment, in the end plates 50 and 52, the discharge passage 60a etc. branches off from the connecting passage 54a etc., and the refrigerant from the shaft 12 is obtained from a single common passage (in this case, the connecting passage 54a etc.). For this reason, the supply passage 16a etc. in the shaft 12 is configured to flow only into the connecting passage 54a etc., and the flow path configuration in the shaft 12 can be simplified. Note that the connecting passage 54a etc. and the discharge passage 60a etc. in the end plates 50 and 52 may each be supplied with refrigerant independently from the supply passage formed in the shaft 12.

[0056] In the embodiments described above, the connecting passages 54a, etc., are made into grooves that connect the supply passage 16a, etc., and the passage 22a, etc., respectively, in order to easily form the connecting passages 54a, etc., but the invention is not limited to this. For example, they may be holes that penetrate the end plates 50, 52. Similarly, the discharge passages 60a~60f, 70a~70f do not have to be holes that penetrate the end plates 50, 52, but may also be grooves.

[0057] In the above embodiment, uniform cooling of the coil ends 8a and 8b was made possible with a simple configuration by making the end plates 50 and 52 that sandwich the rotor core 20 from the X and Y sides the same shape, but the invention is not limited to this. Depending on the degree of cooling required for the coil ends 8a and 8b, the selection of flow paths and the flow path configuration in the end plates 50 and 52 can be appropriately changed.

[0058] Based on the above description, this specification includes the following items. [1] A shaft extending in the axial direction through which a refrigerant flows, A rotor core fixed to the aforementioned shaft, A first end plate located on one axial side of the rotor core, A second end plate located on the other axial side of the rotor core, Equipped with, The rotor core comprises a first flow path for flowing the refrigerant from one axial side to the other axial side, and a second flow path for flowing the refrigerant from the other axial side to the one axial side. The first end plate includes a first connecting passage for flowing the refrigerant from the shaft to the first flow path and a first main discharge passage for flowing the refrigerant from the shaft to the outside. The rotor comprises a second end plate, a second connecting passage for flowing the refrigerant from the shaft to the second passage, and a second main discharge passage for discharging the refrigerant from the shaft to the outside. [2] The first end plate is provided with the first connecting passage and the first main discharge passage branched off, The rotor according to [1], wherein the second end plate is provided with a second connecting passage and a second main discharge passage branched off. [3] The first connecting passage is a passage that receives the refrigerant from the shaft and flows it into the first passage, and the first main discharge passage is a passage that branches off from the first connecting passage. The rotor according to [2], wherein the second connecting passage is a passage that receives the refrigerant flowing out from the shaft and flows it into the second passage, and the second main discharge passage is a passage that branches off from the second connecting passage. [4] The first connecting passage is configured such that the amount of refrigerant supplied to the first passage is greater than that supplied to the first main discharge passage. The rotor according to any one of [1] to [3], wherein the second connecting passage is configured such that the amount of refrigerant supplied to the first passage is greater than that supplied to the second main discharge passage. [5] The first main discharge channel is a channel that discharges the refrigerant from the shaft diagonally from the first end plate toward the radially outer side of the rotor core and toward one side in the axial direction, The rotor according to [1] to [4], wherein the second main discharge channel is a channel that discharges the refrigerant from the shaft diagonally from the second end plate toward the radially outer side of the rotor core and toward the other side in the axial direction. [6] The first end plate is provided with a first sub-discharge channel for discharging the refrigerant that reaches through the second channel, The rotor according to any one of [1] to [5], wherein the second end plate comprises a second sub-discharge channel for discharging the refrigerant that reaches through the first channel. [7] The rotor according to any one of [1] to [6], wherein the rotor core is provided with a plurality of first flow channels and a plurality of second flow channels alternately along the circumferential direction of the rotor core. [8] The rotor according to any one of [1] to [7], wherein the first end plate and the second end plate are identical in shape and are fixed to the rotor core at a predetermined angle offset around the rotation axis of the shaft. A rotor as described in any of [9][1]~[8], stator and, A motor equipped with a motor.

[0059] The specific examples of the technology disclosed in this specification have been described in detail above, but these are merely illustrative and do not limit the scope of the claims. The technology described in the claims includes various modifications and changes to the specific examples described above. The technical elements described in this specification or in the drawings exhibit technical usefulness individually or in various combinations, and are not limited to the combinations described in the claims at the time of filing. The technology illustrated in this specification or in the drawings can achieve multiple objectives simultaneously, and achieving even one of these objectives itself constitutes technical usefulness. [Explanation of Symbols]

[0060] 2: Motor, 4: Stator, 6: Stator core, 8: Coil, 8a, 8b: Coil end, 10: Rotor, 12: Shaft, 14: Refrigerant flow path, 16a, 16b, 16c, 16d, 16e, 16f: Refrigerant supply path, 20: Rotor core, 22a, 22b, 22c, 22d, 22e, 22f: Refrigerant flow path, 30: Magnet slot, 32: Magnet, 40: Claw part, 50, 52: End plates, 54a, 54b, 54c, 54d, 54e, 54f: Refrigerant communication channels, 60a, 60b, 60c, 60d, 60e, 60f: Refrigerant discharge channels, 62a, 62b, 62c, 62d, 62e, 62f: Refrigerant outlets, 70a, 70b, 70c, 70d, 70e, 70f: Refrigerant discharge channels, 72a, 72b, 72c, 72d, 72e, 72f: Refrigerant outlets

Claims

1. A shaft that extends axially and through which a refrigerant flows, A rotor core fixed to the aforementioned shaft, A first end plate located on one axial side of the rotor core, A second end plate located on the other axial side of the rotor core, Equipped with, The rotor core comprises a first flow path for flowing the refrigerant from one axial side to the other axial side, and a second flow path for flowing the refrigerant from the other axial side to the one axial side. The first end plate includes a first connecting passage for flowing the refrigerant from the shaft to the first flow path and a first main discharge passage for flowing the refrigerant from the shaft to the outside. The second end plate includes a second connecting passage for flowing the refrigerant from the shaft to the second passage and a second main discharge passage for discharging it from the shaft to the outside. The first main discharge passage is a passage that branches off from the first connecting passage at a position in the radial direction that does not reach the first passage, and discharges the refrigerant from the shaft diagonally from the first end plate toward the radially outer side of the rotor core and toward one side in the axial direction. The rotor is a rotor in which the second main discharge passage branches off from the second connecting passage at a position in the radial direction that does not reach the second passage, and discharges the refrigerant from the shaft diagonally from the second end plate toward the radially outer side of the rotor core and toward the other axial side.

2. The first connecting passage is configured such that the amount of refrigerant supplied to the first passage is greater than that supplied to the first main discharge passage. The rotor according to claim 1, wherein the second connecting passage is configured such that the amount of refrigerant supplied to the first passage is greater than that supplied to the second main discharge passage.

3. The first end plate is provided with a first sub-discharge channel for discharging the refrigerant that reaches through the second channel, The rotor according to claim 1, wherein the second end plate is provided with a second sub-discharge channel for discharging the refrigerant that reaches through the first channel.

4. The rotor according to claim 1, wherein the rotor core is provided with a plurality of first flow channels and a plurality of second flow channels alternately along the circumferential direction of the rotor core.

5. The rotor according to claim 1, wherein the first end plate and the second end plate are identical in shape and are fixed to the rotor core at a predetermined angle offset around the rotation axis of the shaft.

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