JP7015213B2 - Rotating machine rotor, its manufacturing method and rotating machine - Google Patents

Description

The present invention relates to a rotor of a rotary electric machine, a method for manufacturing the same, and a rotary electric machine.

In a rotary electric machine mounted on a hybrid vehicle, an electric vehicle, or the like, a magnetic field is formed in the stator core by supplying an electric current to the coil, and a magnetic attraction force or a repulsive force is generated between the magnet of the rotor and the stator core. This causes the rotor to rotate with respect to the stator.

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

Japanese Unexamined Patent Publication No. 2015-611666

However, if there is a gap in the rib portion formed between the plurality of through-hole pieces, it may not be possible to generate a flow of the refrigerant 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.

Therefore, an object of the present invention is to provide a rotor of a rotary electric machine capable of enhancing the cooling effect of the rotor, a method of manufacturing the same, and a rotary electric machine.

(1) The rotor (for example, the rotor 4 in the embodiment) of the rotary electric machine (for example, the rotary electric machine 1 in the embodiment) according to one aspect of the present invention is a plurality of laminated steel plates (for example, the steel plates 41 to 41 in the embodiment). 48) The 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 and 32 in the embodiment) formed at intervals in the circumferential direction is provided. In the rotor core, the refrigerant flow holes of the steel plates adjacent to each other in the axial direction communicate with each other only with the refrigerant flow holes of the steel plates adjacent to each other in the axial direction while shifting their positions in the circumferential direction. As a result, a spiral-shaped refrigerant passage (for example, the refrigerant passage 29 in the embodiment) continuous in the axial direction is formed , and each of the plurality of steel plates is formed with a plurality of magnets formed at intervals in the circumferential direction. An annular magnet insertion portion having an insertion hole (for example, a magnet insertion hole 25 in the embodiment) (for example, a magnet insertion portion 26 in the embodiment) and a plurality of refrigerant passages arranged on the inner peripheral side of the magnet insertion portion. An annular refrigerant flow section having a flow hole (for example, a refrigerant flow section 30 in the embodiment) is provided, and the plurality of steel plates are made of different steel plates, and the magnets in each of the different steel plates. The positions of the insertion portions are the same, and the displacement angles (for example, the deviation angles A in the embodiment) of the refrigerant passage portion with respect to the magnet insertion portion in the circumferential direction are different from each other.
( 2 ) In one aspect of the present invention, the plurality of refrigerant flow holes have a plurality of first flow holes (for example, the first flow in the embodiment) having a triangular shape convex on the outer peripheral side when viewed from the axial direction. The hole 31) includes a plurality of second flow holes (for example, the second flow hole 32 in the embodiment) forming a triangular shape convex on the inner peripheral side when viewed from the axial direction, and the first flow. The holes and the second flow hole may be alternately arranged at intervals in the circumferential direction.
( 3 ) In one aspect of the present invention, the refrigerant passage is from one side end (for example, one side end 21a in the embodiment) to the other side end (for example, the other side end 21b in the embodiment) of the rotor core in the axial direction. It may be formed in a continuous spiral shape over the entire surface.
( 4 ) The method for manufacturing a rotor of a rotary electric machine according to one aspect of the present invention is the above-mentioned method for manufacturing a rotor for a rotary electric machine, wherein each of a plurality of steel plate main bodies (for example, the steel plate main body 50 in the embodiment) has a method. A first steel sheet manufacturing step of forming an annular magnet insertion portion having a plurality of magnet insertion holes arranged at intervals in the circumferential direction and manufacturing a plurality of first steel sheets (for example, the first steel sheet 51 in the embodiment). A plurality of second steel plates (for example, the second steel plate 52 in the embodiment) are manufactured by forming an annular refrigerant flow portion having the plurality of refrigerant flow holes in each of the plurality of first steel plates. In the second steel sheet manufacturing step, including the second steel sheet manufacturing step, in each of the plurality of second steel sheets, the shift angle of the refrigerant flow portion with respect to the magnet insertion portion in the circumferential direction is made different from each other. After the second steel sheet manufacturing step, the plurality of second steel sheets are laminated by fixing the position of the magnet insertion portion.
( 5 ) The rotary electric machine according to one aspect of the present invention includes a cylindrical stator (for example, the stator 3 in the embodiment) and the rotor arranged radially inside the stator.

According to the aspect (1) above, in the rotor core, the refrigerant flow holes of the steel plates adjacent to each other in the axial direction are displaced from each other in the circumferential direction, and only the refrigerant flow holes of the steel plates adjacent to each other in the axial direction are provided. By communicating with each other, a spiral-shaped 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-shaped refrigerant passage. Therefore, it is possible to promote the flow of the refrigerant in the rotor as compared with the case where a gap is formed in the rib portion formed between the plurality of through hole pieces. In addition, the rotation of the rotor causes a flow of the refrigerant in the rotor, and the refrigerant can be discharged to the outside of the rotor while maintaining the flow velocity without interrupting the flow of the refrigerant. As a result, it is possible to suppress the intrusion of the refrigerant into the air gap between the stator and the rotor. In addition, since the refrigerant whose temperature has risen is less likely to remain in the rotor due to the influence of centrifugal force, the 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. In addition, the plurality of steel plates are composed of different steel plates, and in each of the different steel plates, the position of the magnet insertion portion is the same, and the displacement angle of the refrigerant passage portion with respect to the magnet insertion portion in the circumferential direction is mutual. The difference avoids restrictions on the layout of the magnet insertion holes and the refrigerant flow holes compared to a structure in which multiple steel sheets are rotated and laminated at the first circumferential interval every predetermined number of sheets. can do. In addition, since the shift angle of the refrigerant flow portion in the circumferential direction with respect to the magnet insertion portion can be finely set for each steel plate, the positions and shapes of the magnet insertion holes and the refrigerant flow holes, and the shape (spiral angle) of the refrigerant passages are determined. The degree of freedom can be secured.
According to the aspect ( 2 ) above, the first flow hole and the second flow hole are alternately arranged at intervals in the circumferential direction, thereby minimizing the type of the flow hole. It is possible to suppress and form the refrigerant passage evenly 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 ( 3 ), the refrigerant passage is formed in a continuous spiral shape from one side end in the axial direction of the rotor core to the other side end, so that the inside of the rotor is formed in the entire axial direction of the rotor core. Can promote the flow of the refrigerant. Therefore, the cooling effect of the rotor can be further enhanced.
According to the above aspect ( 4 ), in the second steel sheet manufacturing step, in each of the plurality of second steel sheets, the shift angle of the refrigerant flow portion with respect to the magnet insertion portion in the circumferential direction is made different from each other to manufacture the second steel plate. Compared with the method of laminating a plurality of second steel sheets by fixing the position of the magnet insertion portion and laminating the plurality of steel sheets by rotating them at predetermined circumferential intervals every predetermined number of sheets. Therefore, it is possible to avoid restrictions on the layout of the magnet insertion hole and the refrigerant flow hole. In addition, since the shift angle of the refrigerant flow portion in the circumferential direction with respect to the magnet insertion portion can be finely set for each steel plate, the positions and shapes of the magnet insertion holes and the refrigerant flow holes, and the shape (spiral angle) of the refrigerant passages are determined. The degree of freedom can be secured.
According to the above aspect ( 5 ), a rotary electric machine capable of enhancing the cooling effect of the rotor by providing the cylindrical stator and the rotor arranged radially inside the stator is provided. Can be provided.

The schematic block diagram of the rotary electric machine which concerns on embodiment. The second arrow view of FIG. 1 as seen from the axial direction of the rotor according to the embodiment. The schematic diagram of the refrigerant passage 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. Front view of the rotor according to the first comparative example. Front view of the rotor according to the second comparative example.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the embodiment, a rotary electric machine (driving motor) mounted on a vehicle such as a hybrid vehicle or an electric vehicle will be described.

<Rotating machine>
FIG. 1 is a schematic configuration diagram showing an overall configuration of a rotary electric machine 1 according to an embodiment. FIG. 1 is a diagram including a cross section cut by a virtual plane including the axis C.
As shown in FIG. 1, the rotary electric 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 for accommodating the stator 3 and the rotor 4. A refrigerant (not shown) is housed in the case 2. A part of the stator 3 is arranged in the case 2 in a state of being immersed in the refrigerant. For example, as the refrigerant, ATF (Automatic Transmission Fluid) or the like, which is a hydraulic oil used for lubrication of a transmission, power transmission, or the like, is used.

The output shaft 5 is rotatably supported by the case 2. In FIG. 1, reference numeral 6 indicates a bearing that rotatably supports the output shaft 5. 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 “diameter 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 mounted on 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 sheets 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 mounted on the stator core 11. The coil 12 includes a U-phase coil, a V-phase coil, and a W-phase coil arranged with a phase difference of 120 ° from each other in the circumferential direction. The coil 12 includes an insertion portion 12a inserted into a slot (not shown) of the stator core 11 and a coil end portion 12b projecting axially from the stator core 11. A magnetic field is generated in the stator core 11 when a current flows through the coil 12.

The rotors 4 are arranged radially inside the stator 3 at intervals. The rotor 4 is fixed to the output shaft 5. The rotor 4 is configured to be rotatable around the axis C integrally with the output shaft 5. 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 sheets in the axial direction.

The end face plates 23 are arranged at both ends 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 holes 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 surface of the rotor core 21 in the axial direction.

<Magnet insertion hole>
A magnet insertion hole 25 that penetrates the rotor core 21 in the axial direction is provided on the outer peripheral portion 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 in each magnet insertion hole 25. When viewed from the axial direction of FIG. 2 (when viewed from the front), the magnet 22 has a V shape that opens outward in the radial direction. 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 have a plurality of first flow holes 31 forming a triangular shape convex on the outer side (outer peripheral side) in the radial direction and the inner side (inner peripheral side) in the radial direction. It includes a plurality of second flow holes 32 having a convex triangular shape. When viewed from the axial direction, the first flow hole 31 and the second flow hole 32 are alternately arranged at intervals in the circumferential direction.

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 spaced apart from each other in the inner peripheral portion of the rotor core 21. Is placed. 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 arranged on the inner side (inner peripheral side) in the radial direction of the magnet insertion portion 26. In FIG. 2, reference numeral 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 to each other in the axial direction communicate with each other only with the refrigerant flow holes 31 and 32 of the steel plates adjacent to each other in the axial direction while shifting their positions in the circumferential direction. As a result, a spiral-shaped refrigerant passage 29 that is continuous in the axial direction is formed. Here, communicating with only the refrigerant flow holes of the steel plates adjacent in the axial direction means that only one refrigerant flow hole formed in one of the steel plates 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 of the steel plates adjacent to each other in the axial direction and two refrigerant flow holes 31X2 formed in the other steel plate communicate with each other (a configuration in which one refrigerant flow hole 31X2 is in communication with each other. The first comparative example) is not configured to communicate with each other only with the refrigerant flow holes of the steel plates adjacent to each other in the axial direction.

As shown in FIG. 11, the configuration (second comparative example) in which the refrigerant flow hole 31Y1 formed in one of the steel plates adjacent to each other in the axial direction and the refrigerant flow hole 31Y2 formed in the other steel plate do not communicate with each other is provided. , It is not a configuration that communicates with only the refrigerant flow holes of the steel plates adjacent to each other in the axial direction. That is, the configuration in which the refrigerant flow hole 31Y1 formed in one of the steel plates adjacent in the axial direction and the non-formated portion of the refrigerant flow hole in the other steel plate overlap (second comparative example) is a steel plate adjacent in the axial direction. It is not a configuration that communicates with only the refrigerant flow hole of the above.

As shown in FIG. 3, the refrigerant passage 29 of the embodiment is formed in a continuous spiral shape from one side end 21a in the axial direction of the rotor core 21 to the other side end 21b. The refrigerant passage 29 has a spiral shape centered on the axis C. A refrigerant such as oil is supplied to the refrigerant passage 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. 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 shift angles of the refrigerant flow portions 30 with respect to the magnet insertion portions 26 in the circumferential direction are different from each other. The plurality of steel plates are laminated by fixing the position of the magnet insertion portion 26.

In the example of FIG. 2, the rotor core 21 is formed by laminating eight steel plates. Reference numeral A in FIG. 2 indicates a shift angle of the refrigerant flow portion 30 with respect to the magnet insertion portion 26 in the circumferential direction. Here, the angle at which the refrigerant flow portion 30 is displaced with respect to the magnet insertion portion 26 in the circumferential direction is such that the position of the magnet insertion portion 26 is fixed and the refrigerant flow portion 30 is rotated clockwise around the axis C. It means the rotation angle when it is rotated to.

Hereinafter, each of the eight steel plates is arranged in the order from the one side end 21a in the axial direction of the rotor core 21 toward the other side end 21b, in the order of "first steel plate 41", "second steel plate 42", and "three sheets". It is also referred to as "mesh steel plate 43", "fourth steel plate 44", "fifth steel plate 45", "sixth steel plate 46", "seventh steel plate 47", and "eighth steel plate 48". The eight steel plates 41 to 48 change the angle of deviation of the refrigerant flow portion 30 with respect to the magnet insertion portion 26 in the circumferential direction for each of the eight steel plates 41 to 48.

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

<Rotor manufacturing method>
Hereinafter, an example of the method for manufacturing the rotor 4 of the embodiment will be described.
First, a plurality of disk-shaped steel plate main 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 main bodies 50 (see FIG. 5). For example, the magnet insertion portion 26 is formed by punching the outer peripheral portion of the steel plate main body 50 to open a plurality of magnet insertion holes 25. As a result, a plurality of first steel plates 51 having the magnet insertion portion 26 are manufactured (first steel plate manufacturing step).

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 on 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. As a result, a plurality of second steel plates 52 having the refrigerant flow portion 30 are manufactured (second steel plate manufacturing step). In the second steel sheet manufacturing step, the shaft fixing hole 8 may be formed by punching the central portion of the first steel sheet 51.

In the second steel plate manufacturing step, in each of the plurality of second steel plates 52, the shift angles of the refrigerant flow portions 30 with respect to the magnet insertion portions 26 in the circumferential direction are made different from each other. For example, the installation base (first steel plate 51 itself) of the first steel plate 51 (see FIG. 5) is fixed in a fixed position, and the punching tool (not shown) for the refrigerant flow portion is rotated clockwise (in the direction of arrow T1 in the figure). The angle of the first steel plate 51 is changed by rotating to. Then, with the angle of the punching tool changed, the inner peripheral portion of the first steel plate 51 is punched. As a result, the shift angle of the refrigerant flow portion 30 with respect to the magnet insertion portion 26 in the circumferential direction is changed for each of the plurality of second steel plates 52.

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

After the process of manufacturing the second steel plate, the plurality of second steel plates 52 are laminated by fixing the position of the magnet insertion portion 26. As a result, the rotor core 21 is manufactured (see FIG. 2). After that, the output shaft 5, the magnet 22, and the end face plate 23 are attached to the rotor core 21. By the above steps, the production of the rotor 4 of the embodiment is completed (see FIG. 1).

As described above, the rotor 4 of the rotary electric machine 1 of the above embodiment is composed of a plurality of laminated steel plates 41 to 48, and a plurality of refrigerant flow holes 31 and 32 formed at intervals in the circumferential direction. In the rotor core 21, the refrigerant flow holes 31 and 32 of the steel plates 41 to 48 adjacent to each other in the axial direction are displaced from each other in the circumferential direction, and the steel plates 41 to 48 adjacent to each other in the axial direction are provided. It is characterized in that a spiral-shaped refrigerant passage 29 continuous in the axial direction is formed by communicating with only the refrigerant passage holes 31 and 32 of the above.
According to this configuration, in the rotor core 21, the refrigerant flow holes 31 and 32 of the steel plates 41 to 48 adjacent to each other in the axial direction are displaced from each other in the circumferential direction, and the steel plates 41 to 48 adjacent to each other in the axial direction are arranged. By communicating with only the refrigerant flow holes 31 and 32 to each other, a spiral-shaped refrigerant passage 29 continuous in the axial direction is formed, so that the refrigerant supplied to the rotor 4 can be passed through the spiral-shaped refrigerant passage 29. It can flow in the axial direction along. Therefore, it is possible to promote the flow of the refrigerant in the rotor 4 as compared with the case where a gap is formed in the rib portion formed between the plurality of through hole pieces. In addition, the rotation of the rotor 4 generates a flow of the refrigerant in the rotor 4, and the refrigerant can be discharged to the outside of the rotor 4 while maintaining the flow velocity without interrupting the flow of the refrigerant. As a result, it is possible to suppress the infiltration of the refrigerant into the air gap between the stator 3 and the rotor 4. In addition, since the refrigerant whose temperature has risen is less likely to remain in the rotor 4 due to the influence of centrifugal force, the 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 above embodiment, in each of the plurality of steel plates 41 to 48, the shift angles A1 to A8 of the refrigerant flow portion 30 with respect to the magnet insertion portion 26 in the circumferential direction are different from each other, and the plurality of steel plates 41 to 48 have the magnet insertion portions. By fixing the positions of 26 and laminating them, the magnet insertion hole 25 and the refrigerant passage are compared with the structure in which a plurality of steel plates are rotated and laminated at a predetermined circumferential interval by a predetermined number of sheets. It is possible to avoid restrictions on the layout of the flow holes 31 and 32. In addition, since the shift angles A1 to A8 of the refrigerant flow portion 30 with respect to the magnet insertion portion 26 in the circumferential direction can be finely set for each steel plate, the positions and shapes of the magnet insertion holes 25 and the refrigerant flow holes 31 and 32, as well as the positions and shapes of the magnet insertion holes 25 and the refrigerant flow holes 31 and 32, and It is possible to secure the degree of freedom in the shape (spiral angle) of the refrigerant passage 29.

In the above embodiment, the first flow hole 31 and the second flow hole 32 are alternately arranged at intervals in the circumferential direction, thereby minimizing the types of flow holes and the rotor. The refrigerant passage 29 can be formed evenly in the circumferential direction of 4. 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 continuous spiral shape from one side end 21a in the axial direction of the rotor core 21 to the other side end 21b, whereby the rotor 4 is formed over the entire axial direction of the rotor core 21. The flow of the refrigerant can be promoted within. Therefore, the cooling effect of the rotor 4 can be further enhanced.

In the method for manufacturing the rotor 4 of the rotary electric machine 1 of the above embodiment, in the second steel plate manufacturing step, in each of the plurality of second steel plates 52, the displacement angle A of the refrigerant flow portion 30 with respect to the magnet insertion portion 26 in the circumferential direction is A. After the process of manufacturing the second steel plate, the plurality of second steel plates 52 are laminated with the position of the magnet insertion portion 26 fixed, so that the plurality of steel plates are formed on the first circumference every predetermined number. As compared with the method of laminating by rotating them at directional intervals, it is possible to avoid restrictions on the layout of the magnet insertion holes 25 and the refrigerant flow holes 31 and 32. In addition, since the shift angle A of the refrigerant flow portion 30 with respect to the magnet insertion portion 26 in the circumferential direction can be finely set for each steel plate, the positions and shapes of the magnet insertion holes 25 and the refrigerant flow holes 31 and 32, as well as the refrigerant passages. The degree of freedom of the shape (spiral angle) of 29 can be secured.

The rotary electric machine 1 of the above embodiment includes the cylindrical stator 3 and the rotor 4 arranged radially inside the stator 3, so that the cooling effect of the rotor 4 can be enhanced. The rotary electric machine 1 can be provided.

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

In the above-described embodiment, when viewed from the axial direction, the plurality of refrigerant flow holes 31 and 32 have a plurality of first flow holes 31 forming a triangular shape convex on the outer side (outer peripheral side) in the radial direction and the inner side in the radial direction. Although a configuration including a plurality of second through holes 32 having a convex triangular shape on the (inner peripheral side) is described, the present invention is not limited to this. For example, the plurality of refrigerant flow holes may be composed only of those having a triangular shape convex on the radial outer side (outer peripheral side), or those having a triangular shape convex on the radial inner side (inner peripheral side). It may be composed of only. That is, the plurality of refrigerant flow holes may have a triangular shape.

The plurality of refrigerant flow holes are not limited to having a triangular shape. For example, the plurality of refrigerant flow holes may be polygonal shapes other than triangles such as rectangles. For example, the plurality of refrigerant flow holes may be circular or elliptical. Various modes can be adopted for the shape of the plurality of refrigerant flow holes according to the required specifications. In the example of FIG. 9, the plurality of refrigerant flow holes 131 each have a circular shape.

In the above-described embodiment, the configuration in which the magnet 22 has a V-shape that opens outward in the radial direction when viewed from the axial direction has been described, but the present invention is not limited to this. For example, when viewed from the axial direction, the magnet 22 may have a rectangular shape having a length in the tangential direction component in the rotation direction R1 of the rotor 4.

In the above-described embodiment, the rotary electric machine 1 has been described with reference to an example in which the rotary electric machine 1 is a traveling motor mounted on a vehicle such as a hybrid vehicle or an electric vehicle, but the present invention is not limited to this. For example, the rotary electric machine 1 may be a motor for power generation, a motor for other purposes, or a rotary electric machine (including a generator) other than that for a vehicle.

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

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

In the above-described embodiment, eight magnet insertion holes 25 are arranged on the outer peripheral portion of the rotor core 21 at intervals in the circumferential direction, but the present invention is not limited to this. For example, the number of magnet insertion holes 25 arranged may be 7 or less, or 9 or more.

In the above-described embodiment, the description has been given with reference to an example in which eight refrigerant flow holes 31 and 32 are arranged at intervals in the circumferential direction on the inner peripheral portion of the rotor core 21, but the present invention is not limited to this. For example, the number of arrangements of the 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 with reference to an example in which the refrigerant passage 29 is formed in a continuous spiral shape from one side end 21a in the axial direction to the other side end 21b of the rotor core 21, but the present invention is not limited to this. .. For example, the refrigerant passage 29 may be formed in a continuous spiral shape in a part of the rotor core 21 in the axial direction.

In the above-described embodiment, in the second steel plate manufacturing process, the installation table (first steel plate itself) of the first steel plate 51 is fixed in a fixed position, and the punching tool for the refrigerant flow portion is rotated clockwise (direction of arrow T1). The explanation has been given with an example of rotation, but the present invention is not limited to this. For example, the punching tool for the refrigerant flow portion may be fixed at a fixed position, and the installation table of the first steel plate 51 may be rotated clockwise (in the direction of 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 rotate relative to each other around the axis C.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and configurations can be added, omitted, replaced, and other changes without departing from the spirit of the present invention. It is also possible to appropriately combine the above-mentioned modification examples.

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 Flow hole (refrigerant flow 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 (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)
50 ... Steel plate body 51 ... First steel plate 52 ... Second steel plate 131 ... Refrigerant flow hole A ... Shift angle A1 to A8 ... Shift angle

Claims (5)

It has a rotor core composed of a plurality of laminated steel plates and 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 to each other in the axial direction communicate with each other only with the refrigerant flow holes of the steel plates adjacent to each other in the axial direction while shifting their positions in the circumferential direction. As a result, a spiral-shaped refrigerant passage that is continuous in the axial direction is formed .
Each of the plurality of steel sheets
An annular magnet insertion portion having a plurality of magnet insertion holes formed at intervals in the circumferential direction, and an annular magnet insertion portion.
An annular refrigerant flow portion arranged on the inner peripheral side of the magnet insertion portion and having the plurality of refrigerant flow holes is provided.
The plurality of steel plates are composed of different steel plates, and in each of the different steel plates, the position of the magnet insertion portion is the same, and the angle of deviation of the refrigerant passage portion with respect to the magnet insertion portion in the circumferential direction. Is a rotary electric rotor characterized by being different from each other . The plurality of refrigerant flow holes are
Multiple first flow holes forming a triangular shape that is convex on the outer peripheral side when viewed from the axial direction,
Includes a plurality of second flow holes, which form a triangular shape that is convex on the inner peripheral side when viewed from the axial direction.
The rotor of a rotary electric machine according to claim 1 , wherein the first flow hole and the second flow hole are alternately arranged at intervals in the circumferential direction. The rotor of a rotary electric machine according to claim 1 or 2 , wherein the refrigerant passage is formed in a continuous spiral shape from one side end to the other side end in the axial direction of the rotor core. The method for manufacturing a rotor of a rotary electric machine according to any one of claims 1 to 3 .
A first steel sheet manufacturing process for forming a plurality of first steel sheets by forming an annular magnet insertion portion having a plurality of magnet insertion holes arranged at intervals in the circumferential direction on each of the plurality of steel sheet bodies.
Each of the plurality of first steel sheets includes a second steel sheet manufacturing step of forming an annular refrigerant flow portion having the plurality of refrigerant flow holes and manufacturing the plurality of second steel sheets.
In the second steel plate manufacturing step, in each of the plurality of second steel plates, the shift angle of the refrigerant flow portion with respect to the magnet insertion portion in the circumferential direction is made different from each other.
A method for manufacturing a rotor of a rotary electric machine, which comprises laminating a plurality of second steel plates with the position of the magnet insertion portion fixed after the second steel plate manufacturing step. With a cylindrical stator,
The rotary electric machine according to any one of claims 1 to 3 , wherein the rotary electric machine is provided with a rotor of the rotary electric machine arranged inside the stator in the radial direction.

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