Rotors for rotating electric machines, and rotating electric machines

Abstract

To improve the cooling performance of the rotor magnets. [Solution] The rotor 1 for the rotating electric machine comprises a rotor core configured in a substantially cylindrical shape around an axis, rotating shafts 40 and 50 that support the rotor core so as to be rotatable around the axis, a plurality of magnets arranged within the rotor core so as to extend from one end face in the axial direction to the other end face, and an end plate 60 fixed to one end face in the axial direction of the rotor core so as to face the ends of the plurality of magnets. The end plate 60 comprises a refrigerant injection channel 73 for radially injecting refrigerant supplied from the side of the rotating shafts 40 and 50 toward the radially outward direction, a first guide wall 67a that narrows the radiation angle θ of the refrigerant injected from the refrigerant injection channel 73 and guides the flow of refrigerant toward approaching the center of the magnetic pole 30 composed of a plurality of magnets, and a second guide wall 68a provided radially outward from the position where the first guide wall 67a is provided and guides the flow of refrigerant toward the direction of the refrigerant flow guided by the first guide wall 67a toward the center of the magnetic pole.

Description

Technical Field

[0001] The present invention relates to a rotor for a rotating electrical machine and a rotating electrical machine.

Background Art

[0002] In recent years, in order to enable more people to access affordable, reliable, sustainable, and advanced energy, research and development have been conducted on rotating electrical machines that contribute to energy efficiency. Conventionally, such a rotating electrical machine includes a rotor having a substantially annular rotor core, an end plate disposed on a first rotor core end face on one end side in the axial direction of the rotor core, a stator core disposed at a predetermined interval from the outer peripheral surface of the rotor, and a stator having a coil attached to the stator core. It is disclosed that a refrigerant flow path groove for guiding the refrigerant to the radially outer side of the end plate is formed on the surface of the end plate facing the rotor core.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, the conventional technology attempts to uniformly cool the coil ends and does not consider the cooling performance of the magnets of the rotor.

[0005] An object of the present invention is to provide a rotor for a rotating electrical machine and a rotating electrical machine that can improve the cooling performance of the rotor magnets and improve energy efficiency.

Means for Solving the Problems

[0006] A rotor for a rotating electric machine according to one aspect of the present invention comprises a rotor core configured in a substantially cylindrical shape around an axis, with a plurality of circumferential magnet insertion holes provided inside that extend from one end face to the other in the axial direction, a rotating shaft that supports the rotor core so as to be rotatable around an axis, a plurality of magnets arranged in each of the plurality of magnet insertion holes so as to extend from one end face to the other in the axial direction, and one or more end plates fixed to either or both of the axial end faces of the rotor core so as to face the axial ends of the plurality of magnets, wherein the end plates include a refrigerant injection channel for radially injecting refrigerant supplied from the side of the rotating shaft toward the radially outward direction of the rotor core, a first guide wall that narrows the radiation angle of the refrigerant radially injected from the refrigerant injection channel and guides the flow of refrigerant toward approaching the center of the magnetic poles composed of the plurality of magnets, and a second guide wall provided radially outward from the position where the first guide wall is provided and guides the flow of refrigerant toward further toward the center of the magnetic poles guided by the first guide wall.

[0007] Another aspect of the present invention is a rotating electric machine comprising the above-described rotor for the rotating electric machine and a stator that generates a rotating magnetic field for the rotor. [Effects of the Invention]

[0008] According to the present invention, the refrigerant supplied from the side of the rotating shaft and ejected radially from the refrigerant injection channel is guided to flow near the ends of the magnets, thereby effectively absorbing heat from the ends of the magnets and improving the cooling efficiency of the magnets embedded in the rotor. [Brief explanation of the drawing]

[0009] [Figure 1] A cross-sectional view showing the main components of a rotating electric machine, including a rotor for a rotating electric machine, according to an embodiment of the present invention. [Figure 2] This is a cross-sectional view showing the main part of the rotor core, specifically the cross-section along the line II-II in Figure 1. [Figure 3A] This is a perspective view illustrating the external appearance of the end plate, specifically the inner surface of the end plate facing the axial end of the rotor core. [Figure 3B] This is a perspective view illustrating the appearance of the end plate, specifically the outer surface, which is the side opposite to the inner surface of the end plate. [Figure 4] A perspective view showing the permanent magnets exposed on the end face plates at both ends of the rotor core along the axial direction, the multiple refrigerant guide walls formed on the end face plates, and the refrigerant guide grooves formed by these refrigerant guide walls superimposed. [Figure 5] This diagram illustrates the relationship between the flow of cooling oil flowing out of the oil guide holes in the rotor shaft and the shape of the refrigerant guide wall formed on the inner surface of the end plate. [Modes for carrying out the invention]

[0010] Embodiments of the present invention will be described below with reference to Figures 1 to 5. The rotating electric machine according to the embodiment of the present invention can be mounted on hybrid vehicles and electric vehicles and used as an electric motor for vehicle propulsion, and can also be used as a generator. The rotating electric machine can also be mounted on vehicles and used for various purposes.

[0011] Figure 1 is a cross-sectional view showing the main components of a rotating electric machine 100, including a rotor 1 for a rotating electric machine according to an embodiment of the present invention, and shows a cross-section perpendicular to the axis CL0 extending in the direction perpendicular to the plane of the paper. As shown in Figure 1, the rotating electric machine 100 comprises a rotor 1 that rotates about the axis CL0 and a stator 2 provided so as to surround the outer circumferential surface 1a of the rotor 1. A case 3 is arranged around the stator 2. Hereinafter, the direction in which the axis CL0 extends is defined as the axial direction, the direction extending radially from the axis CL0 in Figure 1 is defined as the radial direction, and the direction along the circumference of a circle centered on the axis CL0 is defined as the circumferential direction.

[0012] The rotating electric machine 100 is configured, for example, as an embedded magnet type synchronous motor. Therefore, the rotor 1 has a rotor core 10 that is substantially annular in shape with an axis CL0, and a plurality of circumferentially oriented magnetic pole portions 30 formed on the rotor core 10. The rotor core 10 is formed by stacking electromagnetic steel sheets, which are magnetic materials, in the axial direction. The magnetic pole portions 30 are configured by inserting permanent magnets 32 into each of a plurality of magnet housing holes 31 provided in the rotor core 10 along the axial direction. In the example shown in Figure 1, one magnetic pole portion 30 is composed of six permanent magnets 32.

[0013] The stator 2 has a substantially annular stator core 20 centered on an axis CL0, which has an inner circumferential surface 20a arranged at a predetermined radial distance from the outer circumferential surface 1a of the rotor 1, and coils 21 attached to the stator core 20. The stator core 20 is constructed by stacking multiple electromagnetic steel sheets, which are magnetic materials, in the axial direction. The coils 21 are conductors having a substantially rectangular cross-section. However, the coils 21 may have a cross-sectional shape other than rectangular, such as a circular cross-section. Multiple circumferential slots 22 are formed on the inner circumferential surface 20a of the stator core 20, extending radially outward, and coils 21 (conductor segments 211 forming the coils 21) are arranged inside each slot 22.

[0014] When current flows through coil 21, a magnetic field is generated in stator 2. This magnetic field interacts with the magnetic field generated by the permanent magnets 32 in the magnetic pole portion 30 of rotor 1, causing rotor 1 to rotate. This generates driving force, causing the vehicle to move.

[0015] Figure 2 is a cross-sectional view showing the main part of the rotor core 10, and is a diagram showing the cross-section along the line II-II in Figure 1. In Figure 2, the rotor shaft 50, which constitutes the output shaft of the rotating electric machine 100, is fitted to the inner circumferential surface 10a of the rotor core 10 via the sleeve 40. An end face plate 60 is placed on one axial end face of the rotor core 10, and an end face plate 80 is placed on the other end face. The rotor core 10 is sandwiched between these end face plates 60 and 80 and fitted into the sleeve 40, and the collar 90 is press-fitted into the sleeve 40 to fix it in place. The rotor shaft 50 and the sleeve 40 are fixed together by methods such as screwing or press-fitting, and after assembly they rotate as a single unit around the axis CL0. In this way, the rotor core 10 and the end face plates 60 and 80 can rotate together with the rotor shaft 50.

[0016] An oil guide hole 56 extending in the axial direction is formed in the axial center portion of the rotor shaft 50. The rotor shaft 50 also has a plurality of discharge holes 52, six in this embodiment, which communicate with the oil guide hole 56 and are arranged radially around the axis CL0 near one axial end of the rotor core 10. The rotor shaft 50 also has a plurality of discharge holes 54, six in this embodiment, which communicate with the oil guide hole 56 and are arranged radially around the axis CL0 near the other axial end of the rotor core 10. Both of the discharge holes 52 and 54 described above penetrate from the inner circumferential surface to the outer circumferential surface of the hollow rotor shaft 50 in which the oil guide hole 56 is formed.

[0017] The sleeve 40 is provided with a plurality of discharge holes 42, six in this embodiment, arranged radially around the axis CL0 near one axial end of the rotor core 10. The sleeve 40 is also provided with a plurality of discharge holes 44, six in this embodiment, arranged radially around the axis CL0 near the other axial end of the rotor core 10. Both of the discharge holes 42 and 44 described above penetrate from the inner circumferential surface to the outer circumferential surface of the hollow sleeve 40.

[0018] The discharge hole 52 and the discharge hole 42 communicate with each other through a space formed in the fitting portion of the rotor shaft 50 and the sleeve 40. The refrigerant (hereinafter referred to as cooling oil) pumped by an oil pump (not shown) and flowing into the oil guiding hole 56 flows into the discharge hole 42 through the discharge hole 52. Similarly, the discharge hole 54 and the discharge hole 44 communicate with each other through a space formed in the fitting portion of the rotor shaft 50 and the sleeve 40. The cooling oil pumped by an oil pump (not shown) and flowing into the oil guiding hole 56 flows into the discharge hole 44 through the discharge hole 54.

[0019] As the rotating electrical machine 100 rotates, the cooling oil flowing into the discharge holes 52 and 54 from the oil guiding hole 56 flows radially outward due to centrifugal force, and flows into the refrigerant guide grooves 61 and 81 provided on the sides facing the end faces of the rotor core 10 of the end plates 60 and 80 respectively through the discharge holes 42 and 44. The cooling oil flowing into the refrigerant guide grooves 61 and 81 cools the axially opposite ends of the permanent magnet 32 inserted and embedded in the rotor core 10 so as to extend along the axial direction, as will be described in detail later, and then flows out of the rotor core 10. The cooling oil flowing out of the rotor core 10 is refluxed to the oil pump through a reflux path (not shown) and an oil cooler.

[0020] FIGS. 3A and 3B are perspective views for explaining the appearance of the end plate 60. FIG. 3A is a view for explaining the surface of the end plate 60 facing the axial end of the rotor core 10 (hereinafter referred to as the inner surface), and FIG. 3B is a view for explaining the surface of the end plate 60 opposite to the inner surface side (hereinafter referred to as the outer surface). As shown in FIGS. 3A and 3B, six positioning holes 65 are provided in the end plate 60 at intervals in the circumferential direction. These positioning holes 65 are used as jig pin insertion holes for relative positioning in the radial direction and the circumferential direction (angular direction) when attaching the end plate 60 to the rotor core 10.

[0021] As shown in FIG. 3A, an inner circumferential recess 60d is formed in the radially innermost portion of the end face plate 60. An annular flow path centered on the axis CL0 is formed in a portion surrounded by the inner circumferential recess 60d, the outer circumference of the sleeve 40, and the axial end of the rotor core 10. A plurality of, in this embodiment, six sets of refrigerant injection flow paths 73 that communicate with the inner circumferential recess 60d and extend radially around the axis are provided on the outer side in the circumferential direction of the inner circumferential recess 60d. The cooling oil that has flowed out radially outward through the discharge holes 52, 42 (FIG. 2) flows into the refrigerant injection flow paths 73 through the inner circumferential recess 60d. Then, due to the centrifugal force generated as the rotor 1 rotates, the cooling oil is radially emitted outward from the refrigerant injection flow paths 73. The spreading angle of the cooling oil when it is radially emitted from the refrigerant injection flow paths 73 is referred to as the radiation angle in this specification. Also, the line that bisects the radiation angle is referred to as the angle center. These will be described later with reference to FIG. 5.

[0022] Refrigerant guide walls 62, 63 are provided at positions outside the radial position where the refrigerant injection flow paths 73 are provided. The portion surrounded by these refrigerant guide walls 62, 63 is the refrigerant guide groove 61. Among the cooling oil that is radially emitted from the refrigerant injection flow paths 73 and flows radially outward in the refrigerant guide groove 61, the cooling oil that flows near both outer sides of the radiation angle is directed by the refrigerant guide walls 62, 63 toward the angle center side of the radiation angle and flows in the refrigerant guide groove 61.

[0023] Referring to FIG. 3B, a flange portion 60F is provided on the inner surface of the end face plate 60. The flange portion 60F is formed thick, and when adjusting the dynamic rotational balance of the end face plate 60 or the entire rotor 1, the portion of the flange portion 60F can be perforated as necessary.

[0024] Figure 4 is a perspective view superimposed on the permanent magnets 32 exposed on the end face plate 60 side of the rotor core 10 along the axial direction, the refrigerant guide walls 62 and 63 of the end face plate 60, and the refrigerant guide groove 61 formed by these refrigerant guide walls 62 and 63. Cooling oil is guided by the refrigerant guide wall 62, which is composed of a guide end 66a, a first guide wall 67a, a second guide wall 68a, and a connecting wall 69a formed at the connection between the first guide wall 67a and the second guide wall 68a, forming a curved section. The refrigerant guide wall 62 is formed so as to absorb heat from one of the axial ends of the multiple permanent magnets 32 embedded in the rotor core 10 so as to extend along the axial direction, and cause the cooling oil to flow radially outward.

[0025] Preferably, as shown in Figure 4, if the connecting wall 69a forming the bent portion of the refrigerant guide wall 62 passes over (crosses) one of the multiple permanent magnets 32 that constitute a single magnetic pole portion 30, it is possible to improve the cooling performance of the permanent magnets 32 by the cooling oil. In this case, in the example shown in Figure 4, it is preferable that the connecting wall 69a be provided at a position that overlaps with one of the permanent magnets 32 located on the radially inner circumference side of the six permanent magnets 32. Hereinafter, the three permanent magnets 32 located on the radially inner circumference side as described above will be referred to as inner circumference magnets, and the remaining three permanent magnets 32 located on the outer circumference side will be referred to as outer circumference magnets.

[0026] In Figure 4, the arrow indicating the rotation direction of rotor 1 is drawn as if it rotates clockwise, but rotor 1 can also rotate counterclockwise if necessary. Therefore, by making the contour shape of the refrigerant guide wall 63 mirror-symmetric to that of the refrigerant guide wall 62, stable cooling performance can be obtained regardless of the rotation direction of rotor 1.

[0027] Figure 5 illustrates the relationship between the flow of cooling oil flowing out of the oil guide hole 56 in the rotor shaft 50 and the shape of the refrigerant guide wall formed on the inner surface of the end plate 60. The refrigerant guide wall 62 is composed of a guide end 66a, a first guide wall 67a, a second guide wall 68a, and a connecting wall 69a that forms a curved section at the connection between the first guide wall 67a and the second guide wall 68a. The refrigerant guide wall 63 is composed of a guide end 66b, a first guide wall 67b, a second guide wall 68b, and a connecting wall 69b that forms a curved section at the connection between the first guide wall 67b and the second guide wall 68b.

[0028] The portion enclosed by two opposing refrigerant guide walls 62 and 63 becomes the refrigerant guide groove 61. Generally, the number of magnetic poles of an electric motor is determined according to the specifications required for the motor, but in this embodiment, we will explain using the case in which six magnetic pole portions 30 are embedded in the rotor core 10 as an example. The refrigerant guide groove 61 is provided so as to face each of the six magnetic pole portions 30. Therefore, as is clearly shown in Figure 3A, six refrigerant guide grooves 61 are provided on the inner surface of the end plate 60 at equal angular intervals in the circumferential direction.

[0029] The centrifugal force generated by the rotation of rotor 1 causes the cooling oil to flow radially outward from the refrigerant injection section 74, spreading at a radiation angle θ. The line that bisects this radiation angle θ is defined as the angular center CA. The refrigerant guide walls 62 and 63 narrow the radiation angle of the cooling oil flowing radially outward with a spreading radiation angle θ, guiding it toward the angular center CA. This angular center CA coincides with the magnetic pole centers of the magnetic pole section 30, which is composed of six permanent magnets 32 embedded in positions opposite the refrigerant guide groove 61. As a result, the refrigerant guide walls 62 and 63 narrow the radiation angle of the cooling oil flowing radially outward with a spreading radiation angle θ, guiding it toward the magnetic pole centers of the magnetic pole section 30.

[0030] The guide ends 66a and 66b are provided to protrude radially inward in a peninsula-like manner. More specifically, it is desirable that the guide ends 66a and 66b be positioned radially inward beyond the radial position of the innermost part of the permanent magnet 32i, which is located on the innermost radial side of the multiple permanent magnets 32 constituting the magnetic pole section 30. In Figure 5, if we define the axis passing through the axis and extending horizontally as the X-axis and the axis extending vertically as the Y-axis, the radial position of the innermost part of the permanent magnet 32i, which is located on the innermost radial side, is at a distance H along the Y-axis from the axis, i.e., Y=H. In contrast, the tip portions of the guide ends 66a and 66b protrude toward the axis or the X-axis side of the straight line defined by Y=H.

[0031] The reason for configuring the guide ends 66a and 66b as described above will be explained. The cooling oil injected from the refrigerant injection section 74 is affected by the centrifugal force caused by the rotation of the rotor 1, and also by the Coriolis force generated when it flows along the axial end face of the rotating rotor core 10, causing its flow direction to be biased. When the rotor 1 rotates clockwise in Figure 5, the Coriolis force acts on the cooling oil that spreads radially and flows outward in the radial direction, causing its flow direction to be biased as shown by arrow C in Figure 5. By configuring the guide ends 66a and 66b as described above, the cooling oil that has been subjected to the biasing force can be guided into the refrigerant guide groove 61, making it possible to maintain a high capacity for cooling the permanent magnet 32 ​​with the cooling oil.

[0032] By making the shape of the refrigerant guide wall 63 such that it is symmetrical (mirror symmetrical) with respect to the refrigerant guide wall 62 with respect to the line of the angular center CA, it is possible to maintain a high capacity to cool the permanent magnet 32 ​​with the cooling oil, as described above, even when the rotor 1 is reversed.

[0033] Furthermore, when obtaining power by rotating the electric machine 100, if the expected rotational speed differs between the forward and reverse rotation directions of the electric machine 100, the shapes of the refrigerant guide walls 62 and 63 may be individually set according to the expected rotational speed.

[0034] The flow direction changing section 70 is provided at the same radial position as the multiple refrigerant injection passages 73 arranged in the circumferential direction, and adjacent to the refrigerant injection passages 73 in the circumferential direction. The circumferential position, or angular position, where the flow direction changing section 70 is provided is the same circumferential position where the guide end 66a is provided. In other words, the guide end 66a and the flow direction changing section 70 are at the same angular position in the circumferential direction and are in a radially opposing positional relationship.

[0035] Cooling oil, pumped by an oil pump (not shown), flows through the oil guide hole 56 and into the discharge holes 52 and 42. Due to the centrifugal force generated by the rotation of the rotor 1, the cooling oil flowing through the discharge holes 52 and 42 is accelerated radially outward and collides with the flow direction changing section 70. The flow direction of the cooling oil that collides with the flow direction changing section 70 is changed to the circumferential direction and flows along the inner circumferential recess 60d. Then, at the refrigerant inlet 72, the flow direction is changed radially again, and the cooling oil flows into the refrigerant injection passage 73. Due to the centrifugal force generated by the rotation of the rotor 1, the cooling oil flowing through the refrigerant injection passage 73 is accelerated radially outward and ejected radially from the refrigerant injection section 74. In this way, cooling oil can be supplied with sufficient flow velocity to the axial end faces of the multiple permanent magnets 32 embedded in the rotor core 10 so as to extend axially, thereby improving cooling performance.

[0036] The cooling oil ejected radially from the refrigerant injection section 74 flows over the axial end of the inner magnet, absorbing heat from the inner magnet. Of the cooling oil ejected radially from the refrigerant injection section 74, the cooling oil flowing near the outside of the radiation angle θ is guided by the guide end 66a and the first guide wall 67a, flows over the axial end of the inner magnet, and is then guided by the connecting wall 69a and the second guide wall 68a, flows over the axial end face of the outer magnet, which generates a relatively large amount of heat. This makes it possible to improve the cooling efficiency of the magnets.

[0037] The above describes the configuration of the end plate 60 provided adjacent to one axial end face of the rotor core 10. However, the end plate 80 provided adjacent to the other end face of the rotor core 10 can have the same configuration as the end plate 60. In this case, it is desirable to independently set the diameters of the discharge holes 52, 42 and 54, 44 depending on the heat distribution at each end of the rotor core 10 in the axial direction, and whether they are on the upstream or downstream side of the oil guide hole 56. Furthermore, although an example of providing end plates 60 and 80 on both axial ends of the rotor core 10 has been described, it is also possible to provide end plates on only one of the end faces.

[0038] This embodiment can produce the following effects and benefits. (1) The rotor 1 for the rotating electric machine (Figure 1) is configured in a substantially cylindrical shape with an axis CL0, and has a rotor core 10 inside which a plurality of circumferential magnet housing holes 31 extending from one end face to the other in the axial direction, a rotating shaft 40, 50 (Figure 2) that supports the rotor core 10 so as to be rotatable around the axis, a plurality of magnets 32 arranged in each of the plurality of magnet housing holes 31 so as to extend from one end face to the other in the axial direction, and one or more end plates 6 fixed to either or both of the axial end faces of the rotor core 10 so as to face the axial ends of the plurality of magnets 32. The end plates 60 and 80 are provided with a refrigerant injection channel 73 (Figures 3A and 3B) for radially injecting refrigerant supplied from the side of the rotating shafts 40 and 50 toward the radially outward direction of the rotor core 10, a first guide wall 67a that narrows the radiation angle θ (Figure 5) of the refrigerant radially injected from the refrigerant injection channel 73 and guides the flow of refrigerant toward the center of the magnetic pole 30 composed of multiple magnets 32, and a second guide wall 68a provided radially outward from the position where the first guide wall 67a is provided and guides the flow of refrigerant toward the center of the magnetic pole further toward the direction of the refrigerant flow guided by the first guide wall 67a.

[0039] According to this method, the refrigerant is guided to flow near the ends of the magnet, allowing it to effectively absorb heat from the ends of the magnet and improve cooling efficiency.

[0040] (2) The rotor 1 for the rotating electric machine further has a connecting wall 69a that connects the first guide wall 67a and the second guide wall 68a, and the position and shape of the connecting wall 69a are determined such that the coolant guided and flowing through the connecting wall 69a absorbs heat at the axial end of one of the magnets 32 and flows toward the second guide wall 68a. According to this, when the refrigerant changes its trajectory at the connecting wall 69a, the wetted surface area of ​​the magnet that absorbs heat can be increased, thereby improving cooling performance.

[0041] (3) In the rotor 1 for the rotating electric machine, the second guide wall 68a is positioned and shaped such that it absorbs heat at the axial end of the magnets among the plurality of magnets 32 that are located radially outward from the magnets that have absorbed heat by the coolant guided to the connecting wall 69a, and that it faces radially outward. According to this, it becomes possible to efficiently cool magnets located radially outward, which generate a relatively large amount of heat.

[0042] (4) The rotor 1 for the rotating electric machine is further provided with a guide end 66a located radially inward from the position of the first guide wall 67a and connected to the first guide wall 67a, the guide end 66a which guides the refrigerant that is radiated along the outer side of the radiation angle θ to flow along the first guide wall 67a, and the guide end 66a protrudes radially inward from the radial position H of the radially inward innermost part of the magnet 32i which is the radially innermost of the plurality of magnets 32.

[0043] According to this, of the refrigerant radiated at a radiation angle θ, the refrigerant that flows near the outside of the radiation angle θ and is further affected by the Coriolis force and tends to deviate outside the radiation angle θ can be guided into the refrigerant guide groove, thereby improving the cooling performance of the magnets that make up the magnetic poles.

[0044] (5) In the rotor 1 for the rotating electric machine, the end plate 60 (Figure 5) is further provided with a flow direction changing section 70 at an angular position adjacent to the refrigerant injection passage 73 in the circumferential direction at a radial position where the refrigerant injection passage 73 is provided, and facing the guide end 66a. The flow direction changing section 70 is configured to change the flow direction of the refrigerant supplied from the side of the rotating shafts 40 and 50 and flowing out radially to the circumferential direction, and to guide it to the refrigerant inlet 72 of the refrigerant injection passage 73. According to this method, the flow direction of the refrigerant supplied from the side of the rotating shaft and flowing radially can be changed to the circumferential direction, allowing the refrigerant to be distributed more evenly in the refrigerant injection channel, thereby reducing uneven cooling.

[0045] (6) The rotor 1 for the rotating electric machine further has a second refrigerant guide wall 63 which has a shape that is line-symmetric with respect to a line passing through the angular center CA at a radiation angle θ with respect to the shape of the first refrigerant guide wall 62 which is composed of a guide end 66a, a first guide wall 67a, a connecting wall 69a, and a second guide wall 68a. According to this, it becomes possible to obtain stable cooling performance regardless of the rotation direction of the rotor for rotating electric machinery.

[0046] (7) The rotating electric machine 100 (Figure 1) comprises a rotor 1 for a rotating electric machine as described in (1) to (5) above, and a stator 2 that generates a rotating magnetic field for the rotor 1. According to this, it becomes possible to efficiently cool the magnets that make up the rotor's magnetic poles, thereby improving the performance of the rotating electric machine.

[0047] (8) The rotating electric machine 100 comprises the rotor 1 for the rotating electric machine described in (6) above and a stator 2 that generates a rotating magnetic field for the rotor 1. According to this, it becomes possible to efficiently cool the magnets that make up the rotor's magnetic poles, thereby improving the performance of the rotating electric machine.

[0048] The above description is merely an example, and the present invention is not limited by the embodiments and modifications described above, as long as the features of the present invention are not impaired. It is also possible to arbitrarily combine one or more of the above embodiments and modifications, and to combine modifications with each other. [Explanation of Symbols]

[0049] 1 Rotor, 2 Stator, 3 Case, 10 Rotor core, 20 Stator core, 20a Inner surface, 21 Coil, 22 Slot, 30 Magnetic pole section, 31 Magnet housing hole, 32 Permanent magnet, 40 Sleeve, 42, 44 Discharge holes, 50 Rotor shaft, 52, 54 Discharge holes, 56 Oil guide hole, 60 End plate, 60d Inner recess, 60F Flange section, 61 Refrigerant guide groove, 62, 63 Refrigerant guide wall, 65 Positioning hole, 66a, 66b Guide end, 67a, 67b First guide wall, 68a, 68b Second guide wall, 69a, 69b Connecting wall, 70 Flow direction change section, 72 Refrigerant inlet section, 73 Refrigerant injection flow path, 74 Refrigerant injection section, 80 End plate, 81 Refrigerant guide groove, 100 Rotating electric machine, 211 conductor segments, CA angular center of radiation angle, CL0 axis

Claims

1. A rotor core is configured in a roughly cylindrical shape around an axis, and has multiple circumferential magnet insertion holes inside that extend from one end face to the other in the axial direction, A rotating shaft that supports the rotor core so as to be rotatable around the axis, Each of the aforementioned plurality of magnet insertion holes is provided with a plurality of magnets arranged so as to extend from one end face to the other end face in the axial direction, One or more end plates are fixed to each of the axial end faces of the rotor core, one or both of which are positioned opposite the axial ends of the plurality of magnets. A rotor for a rotating electric machine, comprising: The end plate is A refrigerant injection channel for radially injecting the refrigerant supplied from the side of the rotating shaft toward the radially outward direction of the rotor core, A first guide wall narrows the radiation angle of the refrigerant ejected radially from the refrigerant injection channel and guides the flow of the refrigerant so that it approaches the center of the magnetic pole composed of the multiple magnets, A second guide wall is provided radially outward from the position where the first guide wall is provided, and guides the refrigerant flow so that the direction of the refrigerant flow guided by the first guide wall is further toward the center of the magnetic pole. A rotor for a rotating electric machine, characterized by having the following features.

2. In the rotor for a rotating electric machine according to claim 1, The system further includes a connecting wall that connects the first guide wall and the second guide wall, The rotor for a rotating electric machine is characterized in that the position and shape of the connecting wall are determined such that the coolant guided and flowing through the connecting wall absorbs heat at the axial end of one of the plurality of magnets and is directed toward the second guide wall.

3. In the rotor for a rotating electric machine according to claim 2, The rotor for a rotating electric machine is characterized in that the second guide wall absorbs heat at the axial end of a magnet among the plurality of magnets that is located radially outward from the magnet that absorbs heat by the coolant guided to the connecting wall, and its position and shape are determined to face radially outward.

4. In the rotor for a rotating electric machine according to claim 2, The present invention further comprises a guide end located radially inward from the position of the first guide wall and connected to the first guide wall, which guides the refrigerant that is radiated along the outer side of the radiation angle to flow along the first guide wall, The rotor for a rotating electric machine is characterized in that the guide end protrudes radially inward beyond the radial position of the radially innermost portion of the radially innermost magnet among the plurality of magnets.

5. In the rotor for a rotating electric machine according to claim 4, The end plate is further provided with a flow direction changing section at an angular position adjacent to the refrigerant injection passage in the circumferential direction and facing the guide end, at the radial position where the refrigerant injection passage is provided. The flow direction changing unit is configured to change the flow direction of the refrigerant supplied from the side of the rotating shaft and flowing out in the radial direction to the circumferential direction, and to guide it to the refrigerant inlet of the refrigerant injection passage. A rotor for rotating electric machines characterized by the following features.

6. In the rotor for a rotating electric machine according to claim 4 or 5, A rotor for a rotating electric machine, further comprising a second refrigerant guide wall having a shape symmetric to the shape of a first refrigerant guide wall, which is composed of the guide end, the first guide wall, the connecting wall, and the second guide wall, with respect to a line passing through the angular center of the radiation angle.

7. A rotor for a rotating electric machine as described in any one of claims 1 to 5, A stator that generates a rotating magnetic field for the rotor of the aforementioned rotating electric machine and A rotating electric machine characterized by having the following features.

8. A rotor for a rotating electric machine according to claim 6, A stator that generates a rotating magnetic field for the rotor of the aforementioned rotating electric machine and A rotating electric machine characterized by having the following features.

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