JP2019213245A - Rotor for rotary electric machine and manufacturing method for the same and rotary electric machine - Google Patents

Abstract

A rotor cooling effect is improved. A rotor of a rotating electric machine according to an embodiment includes a rotor core 21 that is formed of a plurality of laminated steel plates 41 to 48 and that has a plurality of refrigerant flow holes 31 and 32 that are formed at intervals in the circumferential direction. In the rotor core 21, the refrigerant passage holes 31, 32 of the steel plates 41 to 48 that are axially adjacent to each other are displaced from each other in the circumferential direction while the refrigerant passage holes of the steel plates 41 to 48 that are axially adjacent to each other are provided. By communicating only with 31 and 32, a spiral refrigerant passage 29 continuous in the axial direction is formed. [Selection diagram] Figure 2

Description

  The present invention relates to a rotor of a rotating electrical machine, a manufacturing method thereof, and the rotating electrical machine.

  In a rotating electrical machine mounted on a hybrid vehicle, an electric vehicle, or the like, a magnetic field is formed in the stator core by supplying current to the coil, and a magnetic attractive force or repulsive force is generated between the rotor magnet and the stator core. Thereby, a rotor rotates with respect to a stator.

  As a rotor used for a rotating electrical machine, a rotor having a rotor core formed by laminating a plurality of electromagnetic steel plates is known. For example, Patent Document 1 discloses that each steel plate has a magnet insertion hole piece formed at each first circumferential interval and a second circumferential direction having a size different from the first circumferential interval. There is disclosed a structure in which a plurality of through-hole pieces formed at intervals are provided, and a plurality of steel plates are rotated and laminated at predetermined intervals in a first circumferential direction. Patent Document 1 aims to prevent rotor eccentricity and stress concentration while maintaining production efficiency.

Japanese Patent Laying-Open No. 2015-61466

However, in the case where a gap is generated in the rib portion formed between the plurality of through-hole pieces, the flow of the refrigerant does not occur in the rotor, and it may be difficult to sufficiently cool the rotor. There is.
Therefore, there is room for improvement in enhancing the cooling effect of the rotor.

  Then, an object of this invention is to provide the rotor of the rotary electric machine which can improve the cooling effect of a rotor, its manufacturing method, and a rotary electric machine.

(1) A rotor (for example, the rotor 4 in the embodiment) of the rotating electrical machine (for example, the rotating electrical machine 1 in the embodiment) according to one aspect of the present invention includes a plurality of stacked steel plates (for example, the steel plates 41 to 41 in the embodiment). 48) and a rotor core (for example, the rotor core 21 in the embodiment) having a plurality of refrigerant flow holes (for example, the refrigerant flow holes 31, 32 in the embodiment) formed at intervals in the circumferential direction. In the rotor core, the refrigerant flow holes of the steel plates adjacent in the axial direction communicate with each other only with the refrigerant flow holes of the steel plates adjacent in the axial direction while shifting their positions in the circumferential direction. Thus, a spiral-shaped refrigerant passage that is continuous in the axial direction (for example, the refrigerant passage 29 in the embodiment) is formed.
(2) In one aspect of the present invention, each of the plurality of steel plates has an annular magnet insertion having a plurality of magnet insertion holes (for example, magnet insertion holes 25 in the embodiment) formed at intervals in the circumferential direction. Portion (for example, magnet insertion portion 26 in the embodiment) and an annular refrigerant flow portion (for example, refrigerant flow in the embodiment) that is disposed on the inner peripheral side of the magnet insertion portion and has the plurality of refrigerant flow holes. 30), and in each of the plurality of steel plates, the circumferential shift angle of the refrigerant flow portion with respect to the magnet insertion portion (for example, the shift angle A in the embodiment) is different from each other. The steel plate may be laminated with the position of the magnet insertion portion fixed.
(3) In one aspect of the present invention, the plurality of refrigerant flow holes are a plurality of first flow holes (for example, the first flow holes in the embodiment) having a triangular shape that is convex toward the outer peripheral side when viewed from the axial direction. Hole 31) and a plurality of second flow holes (for example, second flow holes 32 in the embodiment) having a triangular shape convex toward the inner periphery when viewed from the axial direction, and the first flow The holes and the second flow holes may be alternately arranged at intervals in the circumferential direction.
(4) In one aspect of the present invention, the refrigerant passage extends from one axial end of the rotor core (for example, one side end 21a in the embodiment) to the other side end (for example, the other side end 21b in the embodiment). It may be formed in a continuous spiral shape.
(5) A method of manufacturing a rotor of a rotating electrical machine according to an aspect of the present invention is the method of manufacturing a rotor of the rotating electrical machine described above, and each of a plurality of steel plate bodies (for example, a steel plate body 50 in the embodiment) A first steel plate manufacturing step of forming a plurality of first steel plates (for example, the first steel plate 51 in the embodiment) by forming an annular magnet insertion portion having a plurality of magnet insertion holes arranged at intervals in the circumferential direction. And forming an annular refrigerant flow portion having the plurality of refrigerant flow holes in each of the plurality of first steel plates to produce a plurality of second steel plates (for example, the second steel plate 52 in the embodiment). A second steel plate production step, and in the second steel plate production step, in each of the plurality of second steel plates, the shift angle in the circumferential direction of the refrigerant flow portion with respect to the magnet insertion portion is different from each other, The second steel plate maker After, the plurality of second steel plates are laminated to fix the position of the magnet insertion portions.
(6) A rotating electrical machine according to an aspect of the present invention includes a cylindrical stator (for example, the stator 3 in the embodiment), and the rotor arranged on the inner side in the radial direction with respect to the stator.

According to the aspect of (1), the rotor core has only the refrigerant flow holes of the steel plates adjacent in the axial direction, while the refrigerant flow holes of the steel plates adjacent in the axial direction are shifted from each other in the circumferential direction. By communicating with each other, a spiral refrigerant passage that is continuous in the axial direction is formed, so that the refrigerant supplied to the rotor can flow in the axial direction along the spiral refrigerant passage. Therefore, the flow of the refrigerant can be promoted in the rotor as compared with the case where a gap is generated in the rib portion formed between the plurality of through-hole pieces. In addition, the rotation of the rotor generates a refrigerant flow in the rotor, and the refrigerant can be discharged out of the rotor while maintaining the flow velocity without interrupting the refrigerant flow. Thereby, the penetration | invasion of the refrigerant | coolant to the air gap between a stator and a rotor can be suppressed. In addition, since the refrigerant whose temperature has risen is less likely to remain in the rotor due to the centrifugal force, a temperature difference between the refrigerant and the object to be cooled can be secured, and effective heat exchange can be promoted. Therefore, the cooling effect of the rotor can be enhanced.
According to the aspect of (2) above, in each of the plurality of steel plates, the displacement angle in the circumferential direction of the refrigerant flow portion with respect to the magnet insertion portion is different from each other, and the plurality of steel plates have a fixed position of the magnet insertion portion. By being laminated, the layout of the magnet insertion holes and the refrigerant flow holes is limited as compared with a structure in which a plurality of steel plates are rotated and laminated at a first circumferential interval every predetermined number of sheets. You can avoid that. In addition, the displacement angle in the circumferential direction of the refrigerant flow portion relative to the magnet insertion portion can be set finely for each steel plate, so the position and shape of the magnet insertion hole and the refrigerant flow hole, and the shape of the refrigerant passage (spiral angle) A degree of freedom can be secured.
According to the above aspect (3), the first through holes and the second through holes are alternately arranged at intervals in the circumferential direction, thereby minimizing the type of the through holes. Thus, the refrigerant passage can be formed uniformly in the circumferential direction of the rotor. Therefore, the cooling effect of the rotor can be enhanced with a simple structure.
According to the above aspect (4), the refrigerant passage is formed in a continuous spiral shape from one end in the axial direction of the rotor core to the other end, so that the inside of the rotor extends throughout the entire axial direction of the rotor core. Can promote the flow of refrigerant. Therefore, the cooling effect of the rotor can be further enhanced.
According to the aspect of the above (5), in the second steel plate production step, in each of the plurality of second steel plates, the displacement angle in the circumferential direction of the refrigerant flow portion with respect to the magnet insertion portion is made different from each other, thereby producing the second steel plate. Compared to the method of laminating a plurality of second steel plates by laminating a plurality of steel plates at a predetermined interval in the first circumferential direction by laminating a plurality of second steel plates with the position of the magnet insertion portion fixed. Thus, it is possible to avoid a restriction in the layout of the magnet insertion hole and the refrigerant flow hole. In addition, the displacement angle in the circumferential direction of the refrigerant flow portion relative to the magnet insertion portion can be set finely for each steel plate, so the position and shape of the magnet insertion hole and the refrigerant flow hole, and the shape of the refrigerant passage (spiral angle) A degree of freedom can be secured.
According to the aspect of said (6), the rotary electric machine which can improve the cooling effect of a rotor by providing a cylindrical stator and said rotor arrange | positioned inside radial direction with respect to a stator. Can be provided.

The schematic block diagram of the rotary electric machine which concerns on embodiment. The II arrow line view of FIG. 1 which looked at the rotor which concerns on embodiment from the axial direction. The schematic diagram of the refrigerant path which concerns on embodiment. The figure which shows the manufacturing process of the rotor which concerns on embodiment. The figure which shows the manufacturing process of a rotor following FIG. The figure which shows the manufacturing process of a rotor following FIG. The figure which shows the manufacturing process of a rotor following FIG. The figure which shows the manufacturing process of a rotor following FIG. The front view of the rotor which concerns on the modification of embodiment. The front view of the rotor which concerns on a 1st comparative example. The front view of the rotor which concerns on a 2nd comparative example.

  Embodiments of the present invention will be described below with reference to the drawings. In the embodiment, a rotating electric machine (traveling motor) mounted on a vehicle such as a hybrid vehicle or an electric vehicle will be described.

<Rotating electrical machinery>
FIG. 1 is a schematic configuration diagram illustrating an overall configuration of a rotating electrical machine 1 according to the embodiment. FIG. 1 is a diagram including a cross section cut along a virtual plane including an axis C. FIG.
As shown in FIG. 1, the rotating electrical machine 1 includes a case 2, a stator 3, a rotor 4, an output shaft 5, and a refrigerant supply mechanism (not shown).

  The case 2 has a cylindrical box shape that houses the stator 3 and the rotor 4. A refrigerant (not shown) is accommodated in the case 2. A part of the stator 3 is disposed in the case 2 so as to be immersed in the refrigerant. For example, as the refrigerant, ATF (Automatic Transmission Fluid), which is hydraulic oil used for transmission lubrication, power transmission, or the like, is used.

  The output shaft 5 is rotatably supported by the case 2. In FIG. 1, the code | symbol 6 shows the bearing which supports the output shaft 5 rotatably. Hereinafter, the direction along the axis C of the output shaft 5 is referred to as “axial direction”, the direction orthogonal to the axis C is referred to as “radial direction”, and the direction around the axis C is referred to as “circumferential direction”.

The stator 3 includes a stator core 11 and a coil 12 attached to the stator core 11.
The stator core 11 has a cylindrical shape arranged coaxially with the axis C. The stator core 11 is fixed to the inner peripheral surface of the case 2. For example, the stator core 11 is configured by laminating electromagnetic steel plates in the axial direction. The stator core 11 may be a so-called dust core obtained by compression molding metal magnetic powder.

  The coil 12 is attached to the stator core 11. The coil 12 includes a U-phase coil, a V-phase coil, and a W-phase coil that are arranged with a phase difference of 120 ° with respect to the circumferential direction. The coil 12 includes an insertion portion 12 a that is inserted into a slot (not shown) of the stator core 11, and a coil end portion 12 b that protrudes from the stator core 11 in the axial direction. A magnetic field is generated in the stator core 11 when a current flows through the coil 12.

  The rotor 4 is arranged on the inner side in the radial direction with respect to the stator 3 with an interval. The rotor 4 is fixed to the output shaft 5. The rotor 4 is configured to be rotatable integrally with the output shaft 5 around the axis C. The rotor 4 includes a rotor core 21, a magnet 22, and an end face plate 23. In the embodiment, the magnet 22 is a permanent magnet.

  The rotor core 21 has a cylindrical shape arranged coaxially with the axis C. The output shaft 5 is press-fitted and fixed inside the rotor core 21 in the radial direction. The rotor core 21 is configured by laminating electromagnetic steel plates in the axial direction.

  The end face plates 23 are disposed at both end portions in the axial direction with respect to the rotor core 21. The output shaft 5 is press-fitted and fixed inside the end face plate 23 in the radial direction. The end face plate 23 covers at least the magnet insertion hole 25 in the rotor core 21 from both ends in the axial direction. The end face plate 23 is in contact with the outer end face of the rotor core 21 in the axial direction.

<Magnet insertion hole>
A magnet insertion hole 25 penetrating the rotor core 21 in the axial direction is provided on the outer periphery of the rotor core 21. A plurality of magnet insertion holes 25 are arranged at intervals in the circumferential direction (see FIG. 2). A magnet 22 is inserted into each magnet insertion hole 25. When viewed from the axial direction of FIG. 2 (in front view), the magnet 22 has a V shape that opens radially outward. In FIG. 2, the output shaft 5 and the end face plate 23 are not shown.

  In the example of FIG. 2, eight magnet insertion holes 25 are arranged on the outer peripheral portion of the rotor core 21 at intervals in the circumferential direction. That is, the plurality of magnet insertion holes 25 are arranged at intervals of 45 ° in the circumferential direction on the outer peripheral portion of the rotor core 21. Hereinafter, the outer peripheral portion 26 of the rotor core 21 (an annular portion having a plurality of magnet insertion holes 25 formed at intervals in the circumferential direction) is also referred to as a “magnet insertion portion 26”.

<Refrigerant flow hole>
Refrigerant flow holes 31 and 32 that penetrate the rotor core 21 in the axial direction are formed in the inner peripheral portion of the rotor core 21. A plurality of refrigerant flow holes 31 and 32 are arranged at intervals in the circumferential direction. When viewed from the axial direction, the plurality of refrigerant flow holes 31 and 32 are formed on the radially inner side (inner peripheral side) and the plurality of first flow holes 31 having a triangular shape protruding radially outward (outer peripheral side). And a plurality of second flow holes 32 having a convex triangular shape. When viewed from the axial direction, the first flow holes 31 and the second flow holes 32 are alternately arranged in the circumferential direction at intervals.

  In the example of FIG. 2, eight refrigerant flow holes 31 and 32 (four first flow holes 31 and four second flow holes 32) are provided in the inner peripheral portion of the rotor core 21 at intervals in the circumferential direction. Is arranged. That is, the plurality of refrigerant flow holes 31 and 32 are arranged at intervals of 45 ° in the circumferential direction in the inner peripheral portion of the rotor core 21. The plurality of first flow holes 31 and the plurality of second flow holes 32 are arranged at intervals of 90 ° in the circumferential direction. Hereinafter, the inner peripheral portion 30 of the rotor core 21 (an annular portion having a plurality of refrigerant flow holes 31 and 32 formed at intervals in the circumferential direction) is also referred to as a “refrigerant flow portion 30”. The refrigerant flow portion 30 is disposed on the radially inner side (inner peripheral side) of the magnet insertion portion 26. In FIG. 2, symbol K indicates a boundary line (virtual circle) between the magnet insertion portion 26 and the refrigerant flow portion 30.

<Refrigerant passage>
In the rotor core 21, the refrigerant flow holes 31 and 32 of the steel plates adjacent in the axial direction communicate with each other only with the refrigerant flow holes 31 and 32 of the steel plates adjacent in the axial direction while shifting their positions in the circumferential direction. Thus, a spiral refrigerant passage 29 that is continuous in the axial direction is formed. Here, only the refrigerant flow holes of adjacent steel plates in the axial direction communicate with each other means that only one refrigerant flow hole formed in one steel plate adjacent in the axial direction and the other steel plate are formed. It means that only one refrigerant flow hole communicates with each other.

  As shown in FIG. 10, one refrigerant flow hole 31X1 formed in one steel plate adjacent in the axial direction and two refrigerant flow holes 31X2 formed in the other steel plate communicate with each other ( The first comparative example is not configured to communicate with only the refrigerant flow holes of the steel plates adjacent in the axial direction.

  As shown in FIG. 11, the configuration (second comparative example) in which the refrigerant flow hole 31Y1 formed in one steel plate adjacent in the axial direction does not communicate with the refrigerant flow hole 31Y2 formed in the other steel plate. It is not the structure which mutually communicates only with the refrigerant | coolant flow hole of the steel plate adjacent in an axial direction. That is, the configuration (second comparative example) in which the refrigerant flow hole 31Y1 formed in one steel plate adjacent in the axial direction and the refrigerant flow hole non-forming portion of the other steel plate overlap is the steel plate adjacent in the axial direction. It is not the structure which mutually communicates only with the refrigerant | coolant flow hole.

  As shown in FIG. 3, the refrigerant passage 29 of the embodiment is formed in a continuous spiral shape from one end 21 a in the axial direction of the rotor core 21 to the other end 21 b. The refrigerant passage 29 has a spiral shape with the axis C as the center. A refrigerant such as oil is supplied to the refrigerant passage through a supply port (not shown) provided in the case 2 and the like and an opening (not shown) of the end face plate 23. In FIG. 3, the arrow Q1 indicates the direction in which the refrigerant (oil) flows, the arrow R1 indicates the direction of rotation of the rotor 4, and the arrow S1 indicates the direction of the spiral.

  As shown in FIG. 2, in each of the plurality of steel plates, the shifting angles in the circumferential direction of the refrigerant flow portion 30 with respect to the magnet insertion portion 26 are different from each other. The plurality of steel plates are laminated with the position of the magnet insertion portion 26 fixed.

  In the example of FIG. 2, the rotor core 21 is formed by laminating eight steel plates. In FIG. 2, a symbol A indicates a shift angle in the circumferential direction of the refrigerant flow portion 30 with respect to the magnet insertion portion 26. Here, the displacement angle in the circumferential direction of the refrigerant flow part 30 with respect to the magnet insertion part 26 fixes the position of the magnet insertion part 26 and rotates the refrigerant flow part 30 clockwise around the axis C (clockwise). It means the rotation angle when it is rotated.

  Hereinafter, the “first steel plate 41”, “second steel plate 42”, “three steel plates” are arranged in the order in which the eight steel plates are arranged from the one end 21a in the axial direction of the rotor core 21 toward the other end 21b. It is also called “eye plate 43”, “fourth plate 44”, “fifth plate 45”, “sixth plate 46”, “seventh plate 47”, “eight plate steel 48”. Each of the eight steel plates 41 to 48 changes the shifting angle in the circumferential direction of the refrigerant flow portion 30 with respect to the magnet insertion portion 26.

  Here, in the first steel plate 41 to the eighth steel plate 48, the shift angles in the circumferential direction of the refrigerant flow portion 30 with respect to the magnet insertion portion 26 are respectively angle A1, angle A2, angle A3, angle A4, angle A5. , Angle A6, angle A7, and angle A8. The angles A1 to A8 are different from each other. In the embodiment, the angles A1 to A8 have a relationship of A1 <A2 <A3 <A4 <A5 <A6 <A7 <A8.

<Method for manufacturing rotor>
Hereinafter, an example of a method for manufacturing the rotor 4 of the embodiment will be described.
First, a plurality of disk-shaped steel plate bodies 50 are prepared (see FIG. 4).

  Next, an annular magnet insertion portion 26 having a plurality of magnet insertion holes 25 arranged at intervals in the circumferential direction is formed in each of the plurality of steel plate bodies 50 (see FIG. 5). For example, the magnet insertion portion 26 is formed by punching the outer peripheral portion of the steel plate body 50 to open a plurality of magnet insertion holes 25. Thereby, the some 1st steel plate 51 which has the magnet insertion part 26 is produced (1st steel plate production process).

  Next, an annular refrigerant flow portion 30 having a plurality of refrigerant flow holes 31 and 32 arranged at intervals in the circumferential direction is formed in each of the plurality of first steel plates 51 (see FIG. 6). For example, the refrigerant flow portion 30 is formed by punching the inner peripheral portion of the first steel plate 51 to open a plurality of refrigerant flow holes 31 and 32. Thereby, the some 2nd steel plate 52 which has the refrigerant | coolant flow part 30 is produced (2nd steel plate production process). In the second steel plate manufacturing step, the shaft fixing hole 8 may be formed by punching the center portion of the first steel plate 51.

  In the second steel plate manufacturing step, the shift angles in the circumferential direction of the refrigerant flow portion 30 with respect to the magnet insertion portion 26 are made different from each other in each of the plurality of second steel plates 52. For example, the installation base (first steel plate 51 itself) of the first steel plate 51 (see FIG. 5) is fixed at a fixed position, and a punching tool (not shown) for the refrigerant flow portion is turned clockwise (in the direction of arrow T1 in the drawing). The angle of the first steel plate 51 is changed by rotating to. And the punching process is performed to the inner peripheral part of the 1st steel plate 51 in the state which changed the punching tool angle. Thereby, the shift angle in the circumferential direction of the refrigerant flow portion 30 with respect to the magnet insertion portion 26 is changed for each of the plurality of second steel plates 52.

  For example, in the first second steel plate 52, the shift angle in the circumferential direction of the refrigerant flow portion 30 with respect to the magnet insertion portion 26 is set to an angle A1 (for example, 0 °) (see FIG. 6). In the second second steel plate 52, the shift angle in the circumferential direction of the refrigerant flow portion 30 with respect to the magnet insertion portion 26 is set to an angle A2 (A2> A1) (see FIG. 7). In the third second steel plate 52, the shift angle in the circumferential direction of the refrigerant flow portion 30 with respect to the magnet insertion portion 26 is defined as an angle A3 (A3> A2) (see FIG. 8). In the second and subsequent second steel plates 52, the shift angle in the circumferential direction of the refrigerant flow portion 30 with respect to the magnet insertion portion 26 is gradually increased.

  After the second steel plate manufacturing step, the plurality of second steel plates 52 are laminated with the position of the magnet insertion portion 26 fixed. Thereby, the rotor core 21 is produced (see FIG. 2). Thereafter, the output shaft 5, the magnet 22 and the end face plate 23 are attached to the rotor core 21. The manufacture of the rotor 4 of the embodiment is completed through the above steps (see FIG. 1).

As described above, the rotor 4 of the rotating electrical machine 1 according to the above-described embodiment is configured by the plurality of stacked steel plates 41 to 48 and has a plurality of refrigerant flow holes 31 and 32 formed at intervals in the circumferential direction. The refrigerant cores 31 and 32 of the steel plates 41 to 48 adjacent to each other in the axial direction are displaced in the circumferential direction from each other, and the steel plates 41 to 48 adjacent to each other in the axial direction are provided in the rotor core 21. A refrigerant passage 29 having a spiral shape continuous in the axial direction is formed by communicating with only the refrigerant flow holes 31 and 32.
According to this configuration, the coolant flow holes 31 and 32 of the steel plates 41 to 48 adjacent in the axial direction are shifted in the circumferential direction in the rotor core 21 while the positions of the steel plates 41 to 48 adjacent in the axial direction are shifted from each other. By communicating with only the refrigerant flow holes 31, 32, the spiral refrigerant passage 29 continuous in the axial direction is formed, so that the refrigerant supplied to the rotor 4 can be supplied to the spiral refrigerant passage 29. In the axial direction. Therefore, it is possible to promote the flow of the refrigerant in the rotor 4 as compared with a case where a gap is generated in the rib portion formed between the plurality of through-hole pieces. In addition, the rotation of the rotor 4 generates a refrigerant flow in the rotor 4, and the refrigerant can be discharged out of the rotor 4 while maintaining the flow velocity without interrupting the refrigerant flow. Thereby, the penetration of the refrigerant into the air gap between the stator 3 and the rotor 4 can be suppressed. In addition, since the refrigerant whose temperature has increased is less likely to remain in the rotor 4 due to the centrifugal force, a temperature difference between the refrigerant and the object to be cooled can be secured, and effective heat exchange can be promoted. Therefore, the cooling effect of the rotor 4 can be enhanced.

  In the said embodiment, in each of the some steel plates 41-48, the shift | offset | difference angle A1-A8 to the circumferential direction of the refrigerant | coolant flow part 30 with respect to the magnet insertion part 26 differs mutually, and the several steel plates 41-48 are magnet insertion parts. 26, the magnet insertion hole 25 and the coolant passage are compared with a structure in which a plurality of steel plates are rotated and laminated at a predetermined interval in the first circumferential direction. It can be avoided that the layout of the flow holes 31 and 32 is limited. In addition, since the shift angles A1 to A8 in the circumferential direction of the refrigerant flow part 30 with respect to the magnet insertion part 26 can be set finely for each steel plate, the positions and shapes of the magnet insertion hole 25 and the refrigerant flow holes 31 and 32, and The degree of freedom of the shape (spiral angle) of the refrigerant passage 29 can be ensured.

  In the above-described embodiment, the first through holes 31 and the second through holes 32 are alternately arranged in the circumferential direction with a space therebetween, thereby minimizing the types of through holes. The refrigerant passages 29 can be formed evenly in the circumferential direction of the four. Therefore, the cooling effect of the rotor 4 can be enhanced with a simple structure.

  In the above embodiment, the refrigerant passage 29 is formed in a spiral shape that extends from the one side end 21 a in the axial direction of the rotor core 21 to the other side end 21 b, so that the rotor 4 extends over the entire axial direction of the rotor core 21. The flow of the refrigerant can be promoted in the interior. Therefore, the cooling effect of the rotor 4 can be further enhanced.

  In the method of manufacturing the rotor 4 of the rotating electrical machine 1 according to the above embodiment, in the second steel plate manufacturing step, the displacement angle A in the circumferential direction of the refrigerant flow portion 30 with respect to the magnet insertion portion 26 in each of the plurality of second steel plates 52. After the second steel plate manufacturing step, the plurality of second steel plates 52 are laminated with the position of the magnet insertion portion 26 fixed, thereby stacking a plurality of steel plates at a predetermined circumference. Compared with the method of laminating by rotating at intervals in the direction, it is possible to avoid that the layout of the magnet insertion hole 25 and the refrigerant flow holes 31 and 32 is limited. In addition, since the shift angle A in the circumferential direction of the refrigerant flow part 30 with respect to the magnet insertion part 26 can be finely set for each steel plate, the positions and shapes of the magnet insertion hole 25 and the refrigerant flow holes 31, 32, and the refrigerant path The degree of freedom of 29 shapes (spiral angle) can be ensured.

  The rotating electrical machine 1 according to the embodiment includes the cylindrical stator 3 and the rotor 4 arranged on the inner side in the radial direction with respect to the stator 3, thereby enhancing the cooling effect of the rotor 4. The rotating electrical machine 1 can be provided.

  Hereinafter, modifications of the embodiment will be described. In each modified example, the same components as those in the embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the embodiment described above, when viewed from the axial direction, the plurality of refrigerant flow holes 31, 32 are radially inward of the plurality of first flow holes 31 that form a triangular shape that protrudes radially outward (outer peripheral side). Although the structure including the plurality of second flow holes 32 having a triangular shape (inner peripheral side) has been described, the present invention is not limited to this. For example, the plurality of refrigerant flow holes may be configured only with a triangular shape that protrudes radially outward (outer peripheral side), or a triangular shape that protrudes radially inward (inner peripheral side). It may be comprised only by. That is, the plurality of refrigerant flow holes may have a triangular shape.

  The plurality of refrigerant flow holes are not limited to a triangular shape. For example, the plurality of refrigerant flow holes may be polygons other than a triangle such as a rectangle. For example, the plurality of refrigerant flow holes may be circular or elliptical. Various forms can be adopted as the shape of the plurality of refrigerant flow holes according to the required specifications. In the example of FIG. 9, each of the plurality of refrigerant flow holes 131 has a circular shape.

  In the above-described embodiment, the configuration in which the magnet 22 is V-shaped so as to open outward in the radial direction when viewed from the axial direction has been described, but the configuration is not limited thereto. For example, when viewed from the axial direction, the magnet 22 may have a rectangular shape with a longitudinal component in the tangential direction component in the rotation direction R <b> 1 of the rotor 4.

  In the above-described embodiment, the rotating electrical machine 1 has been described by taking an example of a traveling motor mounted on a vehicle such as a hybrid vehicle or an electric vehicle. However, the present invention is not limited to this. For example, the rotating electrical machine 1 may be a motor for power generation, a motor for other uses, or a rotating electrical machine other than for a vehicle (including a generator).

  In the above-described embodiment, the refrigerant passage 29 has been described with an example in which a refrigerant such as oil is supplied through a supply port (not shown) provided in the case 2 or the like and an opening (not shown) of the end face plate 23. However, it is not limited to this. For example, shaft center cooling may be performed using a shaft flow path provided in the output shaft 5. For example, the coolant may be supplied to the magnet along a guide wall (not shown) provided on the end face plate 23 by the rotation of the rotor 4.

  In the above-described embodiment, an example in which the shift angle A in the circumferential direction of the refrigerant flow portion 30 with respect to the magnet insertion portion 26 is changed for each of the plurality of steel plates has been described, but the present invention is not limited thereto. For example, the shift angle A in the circumferential direction of the refrigerant flow portion 30 relative to the magnet insertion portion 26 may be changed for each of a plurality of steel plates. That is, the shift angle A in the circumferential direction of the refrigerant flow portion 30 with respect to the magnet insertion portion 26 may be changed for every predetermined number of steel plates.

  In the above-described embodiment, the example in which the eight magnet insertion holes 25 are arranged in the outer peripheral portion of the rotor core 21 at intervals in the circumferential direction has been described. However, the present invention is not limited thereto. For example, the number of magnet insertion holes 25 may be seven or less, or nine or more.

  In the above-described embodiment, the example in which the eight refrigerant flow holes 31 and 32 are arranged in the inner peripheral portion of the rotor core 21 at intervals in the circumferential direction has been described. However, the present invention is not limited thereto. For example, the number of refrigerant flow holes 31 and 32 may be 7 or less, or 9 or more.

  In the above-described embodiment, the refrigerant passage 29 has been described by taking an example in which the refrigerant passage 29 is formed in a continuous spiral shape from the one end 21a in the axial direction of the rotor core 21 to the other end 21b. . For example, the coolant passage 29 may be formed in a continuous spiral shape in a part of the rotor core 21 in the axial direction.

  In the embodiment described above, in the second steel plate manufacturing step, the installation base (first steel plate itself) of the first steel plate 51 is fixed at a fixed position, and the punching tool for the refrigerant flow portion is turned clockwise (in the direction of arrow T1). Although the example which rotates is demonstrated and demonstrated, it is not restricted to this. For example, the punching tool for the refrigerant flow portion may be fixed at a fixed position, and the installation base of the first steel plate 51 may be rotated clockwise (in the direction of the arrow T1). That is, the installation base of the first steel plate 51 (the first steel plate 51 itself) and the punching tool for the refrigerant flow portion may be relatively rotated about the axis C.

  Although the preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and additions, omissions, substitutions, and other modifications of the configuration can be made without departing from the spirit of the present invention. It is also possible to combine the above-described modified examples as appropriate.

DESCRIPTION OF SYMBOLS 1 ... Rotary electric machine 3 ... Stator 4 ... Rotor 21 ... Rotor core 21a ... One side end 21b ... The other side end 22 ... Magnet 25 ... Magnet insertion hole 26 ... Magnet insertion part 29 ... Refrigerant passage 30 ... Refrigerant flow part 31 ... First Through hole (refrigerant through hole)
32 ... Second flow hole (refrigerant flow hole)
41 ... First steel plate (steel plate)
42 ... Second steel plate (steel plate)
43 ... Third steel plate (steel plate)
44 ... Fourth steel plate
45 ... Fifth steel plate (steel plate)
46. Sixth steel plate (steel plate)
47. Seventh steel plate (steel plate)
48… Eighth steel plate (steel plate)
DESCRIPTION OF SYMBOLS 50 ... Steel plate main body 51 ... 1st steel plate 52 ... 2nd steel plate 131 ... Refrigerant flow hole A ... Shift angle A1-A8 ... Shift angle

Claims (6)

It is composed of a plurality of laminated steel plates, and includes a rotor core having a plurality of refrigerant flow holes formed at intervals in the circumferential direction,
In the rotor core, the refrigerant flow holes of the steel plates adjacent in the axial direction communicate with only the refrigerant flow holes of the steel plates adjacent in the axial direction while being shifted in the circumferential direction. Thus, the rotor of the rotating electrical machine is characterized in that a spiral refrigerant passage continuous in the axial direction is formed. Each of the plurality of steel plates is
An annular magnet insertion portion having a plurality of magnet insertion holes formed at intervals in the circumferential direction;
An annular refrigerant flow portion disposed on the inner peripheral side of the magnet insertion portion and having the plurality of refrigerant flow holes,
In each of the plurality of steel plates, the shifting angle in the circumferential direction of the refrigerant flow portion with respect to the magnet insertion portion is different from each other,
The rotor of a rotating electrical machine according to claim 1, wherein the plurality of steel plates are laminated with the position of the magnet insertion portion fixed. The plurality of refrigerant flow holes are:
A plurality of first flow holes having a triangular shape convex to the outer peripheral side when viewed from the axial direction;
A plurality of second flow holes having a triangular shape that is convex toward the inner peripheral side when viewed from the axial direction,
3. The rotor of a rotating electrical machine according to claim 1, wherein the first flow hole and the second flow hole are alternately arranged at intervals in the circumferential direction.   4. The rotating electrical machine according to claim 1, wherein the refrigerant passage is formed in a spiral shape continuous from one end in the axial direction of the rotor core to the other end. 5. Rotor. A method for manufacturing a rotor of a rotating electrical machine according to any one of claims 1 to 4,
A first steel plate production step of forming a plurality of first steel plates, forming an annular magnet insertion portion having a plurality of magnet insertion holes arranged at intervals in the circumferential direction in each of the plurality of steel plate bodies,
Each of the plurality of first steel plates includes a second steel plate production step of forming a plurality of second steel plates by forming an annular refrigerant flow portion having the plurality of refrigerant flow holes,
In each of the plurality of second steel plates in the second steel plate manufacturing step, the shift angles in the circumferential direction of the refrigerant flow portion with respect to the magnet insertion portion are different from each other,
A method of manufacturing a rotor of a rotating electrical machine, wherein after the second steel plate manufacturing step, the plurality of second steel plates are stacked while fixing the position of the magnet insertion portion. A cylindrical stator;
A rotating electrical machine comprising: the rotor of the rotating electrical machine according to any one of claims 1 to 4 disposed radially inward of the stator.

Images