Rotors, rotating electrical machines and drives

Abstract

A rotor, a rotating electric machine and a driving device are provided. The rotor has: a magnet constituting each magnetic pole; a rotor core having a receiving hole for receiving the magnet and extending in the axial direction; and a resin entering the receiving hole. The rotor core has: a first block; and a second block, which is arranged in the axial direction together with the first block and is configured so that the circumferential position of the receiving hole is offset relative to the first block. The first block and the second block each have a resin groove for the resin to enter, which is connected to the receiving hole of each block and extends from the axial upper end to the lower end. At least a portion of the resin groove of the first block and the resin groove of the second block overlap and are connected in the axial direction, or are connected via the resin groove of at least one other block arranged axially between the first block and the second block.

Description

Technical Field

[0001] The present disclosure relates to a rotor, a rotating electrical machine and a driving device. Background Art

[0002] Conventionally, a rotor laminated core is known in which a permanent magnet is fixed to a laminated body by resin sealing (see, for example, Patent Document 1). In addition, in a rotating electric machine having a permanent magnet rotor, the rotor is provided with a skew structure in order to reduce the cogging torque (see, for example, Patent Document 2). In the skew structure, the laminated rotor core is divided into a plurality of parts in the lamination direction together with the permanent magnets, and each of the divided rotor cores is assembled with a predetermined angle offset.

[0003] However, the permanent magnet is inserted into the magnet insertion part of the rotor core and fixed by bonding with a filler. In the skew structure, the position of the magnet insertion part is offset between the split rotor cores. Therefore, when the filler is filled into the magnet insertion part after stacking a plurality of split rotor cores, there is a possibility that the filler does not fully fill the magnet insertion part. Therefore, in the prior art, the filler is filled into the magnet insertion part for each split layer. However, in this case, the operation time tends to be longer.

[0004] Based on the above, it is known that a rotor having a skewed rotor core and permanent magnets forming poles, wherein the rotor core is divided into a plurality of layers in the axial direction and arranged to have a circumferential phase angle permanent magnet between each layer, is set to the following structure (for example, refer to patent document 2). The rotor core has: an insertion hole for inserting the permanent magnet; and an intermediate hole independently provided at least one place between the poles from the insertion hole. The insertion hole of the rotor core in a certain layer is connected to the intermediate hole of the adjacent layer. According to this structure, the supply path of the filler to the insertion hole of the permanent magnet can be ensured through the intermediate hole, so the rotor having a skewed rotor core can be manufactured at a low cost.

[0005] Prior art literature

[0006] Patent Literature

[0007] Patent Document 1: Japanese Patent Application Publication No. 2007-282392

[0008] Patent Document 2: Japanese Patent Application Publication No. 2011-55641

[0009] In the case of the structure in which the intermediate holes are provided between the poles formed by the permanent magnets, for example, the intermediate holes may affect the magnetic characteristics depending on the angle at which the permanent magnets are provided, etc. Therefore, another technology capable of efficiently manufacturing a skewed rotor core is required. Summary of the invention

[0010] An object of the present disclosure is to provide a technology capable of improving the manufacturing efficiency of a rotor having a skewed rotor core (rotor iron core).

[0011] The exemplary rotor of the present disclosure is used for an inner rotor type rotating electric machine, and has a plurality of magnetic poles in the circumferential direction centered on a central axis extending in the vertical direction, wherein the rotor has: a magnet, the magnet constituting each of the magnetic poles; a rotor core, the rotor core having a receiving hole, the receiving hole receiving the magnet and extending in the axial direction; and a resin, the resin entering the receiving hole. The rotor core has: a first block; and a second block, the second block being arranged in the axial direction together with the first block and configured so that the circumferential position of the receiving hole is offset relative to the first block. The first block and the second block have a resin groove for the resin to enter, the resin groove is connected to the receiving hole of each block, and extends from the axial upper end to the lower end. At least a part of the resin groove of the first block and the resin groove of the second block overlap and are connected in the axial direction, or are connected via the resin groove of at least one other block arranged between the first block and the second block in the axial direction.

[0012] An exemplary rotating electrical machine of the present disclosure includes: a rotor having the above-described structure; and a stator disposed radially outside the rotor.

[0013] An exemplary drive device of the present disclosure has: a rotating electric machine of the above-described structure; and a gear unit connected to the rotating electric machine.

[0014] According to the present disclosure, it is possible to improve the manufacturing efficiency of a rotor having a skewed rotor core. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a diagram schematically showing the structure of a driving device according to an embodiment of the present disclosure.

[0016] Figure 2 It is a perspective view showing a schematic structure of a rotor according to the first embodiment.

[0017] Figure 3 It is a schematic plan view showing, in an enlarged manner, a part of the first block included in the rotor core according to the first embodiment.

[0018] Figure 4 It is a schematic plan view showing, in an enlarged manner, a part of the second block included in the rotor core of the first embodiment.

[0019] Figure 5 This is a schematic perspective view showing a partially enlarged view of a first block and a second block included in the rotor core according to the first embodiment when viewed from obliquely above.

[0020] Figure 6 It is a schematic bottom view showing, in an enlarged manner, a part of the first block included in the rotor core according to the first embodiment.

[0021] Figure 7 It is a plan view schematically showing the relationship between the first magnet disposed in the first magnet receiving hole and the first resin tank.

[0022] Figure 8 It is a side view schematically showing the rotor according to the first embodiment.

[0023] Fig.9A It is a plan view schematically showing the structure of the first magnetic steel plate.

[0024] Fig. 9B It is a plan view schematically showing the structure of the second magnetic steel plate.

[0025] Fig.10 This is a diagram schematically showing a stacking pattern of magnetic steel sheets using a block composed of a first magnetic steel sheet and a second magnetic steel sheet.

[0026] Fig.11 It is a perspective view showing a schematic structure of a rotor according to a second embodiment.

[0027] Fig.12 It is a schematic plan view showing the structure of a first block included in the rotor core according to the second embodiment.

[0028] Fig.13A It is a schematic plan view showing the structure of a part of the upper end magnetic steel plate.

[0029] Fig. 13B It is a schematic plan view showing the structure of a part of the magnetic steel plate at the lower end portion.

[0030] Fig. 13C It is a schematic plan view showing the structure of a part of the intermediate magnetic steel plate.

[0031] Fig.14 This is a diagram schematically showing a cross-sectional structure of a portion of a block group in which a first block and a second block included in a rotor core according to a second embodiment overlap in the axial direction.

[0032] Fig.15 This is a diagram showing a configuration example of a rotor in which a rotor core is composed of five blocks including a first block and a second block.

[0033] Fig.16 This is a diagram showing a configuration example of a rotor in which a rotor core is composed of eight blocks including a first block and a second block.

[0034] (Explanation of symbols)

[0035] 10, 10A, 10B, 10C rotors;

[0036] 11, 11A magnet;

[0037] 12, 12A, 12B, 12C rotor core;

[0038] 12a, 12Aa ... insertion holes;

[0039] 12b, 12Ab receiving holes;

[0040] 13, 13A resin;

[0041] 14, 14A resin tank;

[0042] 15 positioning convex part;

[0043] 20 stator;

[0044] 30 axis;

[0045] 100 Rotating motor;

[0046] 101 Gear unit;

[0047] 120C end magnetic steel plate;

[0048] 120D middle magnetic steel plate;

[0049] 121, 121A first block;

[0050] 122, 122A second block;

[0051] 123 third block (other blocks);

[0052] 124 Block 4 (other blocks);

[0053] 125 Fifth Block (Other Blocks);

[0054] 140 groove;

[0055] 200 drive unit;

[0056] 1211 insertion hole side convex part;

[0057] A central axis;

[0058] F11, F11A first magnet;

[0059] F12b, F12Ab first magnet receiving hole;

[0060] F14, F14A first resin tank;

[0061] Ma tag;

[0062] OE1 first outer edge;

[0063] OE2 second outer edge;

[0064] R1 exists in the region;

[0065] R2 is not in the area;

[0066] S11, S11A second magnet;

[0067] S12Ab second magnet receiving hole;

[0068] S14A Second resin tank;

[0069] SC1, SC2, SC3 bisect the surfaces. DETAILED DESCRIPTION

[0070] The following describes in detail exemplary embodiments of the present disclosure with reference to the accompanying drawings. Figure 1 The direction in which the center axis A of the rotating electrical machine 100 shown extends is referred to as the “axial direction”, and the radial direction and the circumferential direction about the center axis A of the rotating electrical machine 100 are referred to as the “radial direction” and the “circumferential direction”. Similarly, when the rotor 10 is assembled in the rotating electrical machine 100, the directions that coincide with the axial direction, radial direction, and circumferential direction of the rotating electrical machine 100 are referred to as the “axial direction”, the “radial direction”, and the “circumferential direction”. In addition, the direction in which a tangent to a circle about the center axis A extends is referred to as the “tangential direction”. In this specification, Figure 1 The axial direction when the rotating electrical machine is arranged in the direction shown is defined as the up-down direction. In addition, the up-down direction is only a name used for explanation, and does not limit the actual positional relationship or direction.

[0071] <1. Drive device and rotating motor>

[0072] Figure 1 Schematically shows the structure of the drive device 200 according to the embodiment of the present disclosure. Figure 1 As shown, the driving device 200 includes: a rotating electrical machine 100 ; and a gear unit 101 connected to the rotating electrical machine 100 .

[0073] In the present embodiment, the rotating electrical machine 100 is a motor. However, the technology disclosed in the present invention can also be applied to a rotating electrical machine configured as a generator. The rotating electrical machine 100 includes a rotor 10 and a stator 20 disposed radially outside the rotor 10. That is, the rotating electrical machine 100 is an inner rotor type rotating electrical machine.

[0074] The rotor 10 has a magnet 11 for excitation embedded inside (see below). Figure 2That is, the rotary electric machine 100 is an IPM (Inner Rotor: Internally Embedded Permanent Magnet) type rotary electric machine. The rotor 10 will be described in detail later.

[0075] The stator 20 is the armature of the rotating electric machine 100. The stator 20 is cylindrical with the center axis A as the center. The stator 20 faces the rotor 10 arranged on the radial inner side with a gap therebetween and surrounds the rotor 10. In detail, the stator 20 has a stator core 21 and a coil 22. The stator core 21 has: a cylindrical core back extending in the axial direction; and a plurality of pole teeth extending radially inward from the core back. The coil 22 is formed by winding a conductive wire around the pole teeth of the stator core 21 via an insulating member not shown in the figure. When a driving current is supplied to the coil 22, a radial magnetic flux is generated in the pole teeth of the stator core 21. As a result, a circumferential torque is generated in the rotor 10, and the rotor 10 rotates around the center axis A.

[0076] The rotating electric machine 100 further includes a columnar shaft 30 extending in the axial direction. The shaft 30 is arranged radially inside the rotor 10 and fixed to the rotor 10. The shaft 30 rotates together with the rotor 10 about the central axis A. In the present embodiment, the upper end of the shaft 30 is inserted into the housing 1011 of the gear unit 101.

[0077] The gear unit 101 has a plurality of gears 1012 in its housing 1011. The plurality of gears 1012 include a shaft gear 1012a, at least one intermediate gear 1012b, and an output shaft gear 1012c. The shaft gear 1012a is mounted on the upper end of the shaft 30. The output shaft gear 1012c is mounted on the output shaft 1013 of the driving device 200. The intermediate gear 1012b transmits the rotation of the shaft gear 1012a to the output shaft gear 1012c. When the shaft 30 rotates, the shaft gear 1012a rotates, and the force of the rotation is transmitted to the output shaft gear 1012c via the intermediate gear 1012b, thereby rotating the output shaft 1013.

[0078] As described later, the rotor 10 having the skew structure of the present disclosure can be manufactured efficiently, and therefore, the rotating electrical machine 100 and the drive device 200 of the present disclosure can be manufactured at low cost.

[0079] <2. Rotor>

[0080] Next, the rotor 10 will be described in detail. The rotor 10 is used in an inner rotor type rotating electrical machine 100. The rotor 10 has a plurality of magnetic poles in the circumferential direction around a central axis A extending in the vertical direction.

[0081] <2-1. First embodiment>

[0082] Figure 2 1 is a perspective view showing a schematic structure of the rotor 10 according to the first embodiment. Figure 2As shown, the rotor 10 has a magnet 11 , a rotor core 12 , and a resin 13 .

[0083] The magnet 11 constitutes each magnetic pole. In the present embodiment, the number of magnetic poles of the rotor 10 is eight. The rotor 10 has a magnet 11 constituting each of the eight magnetic poles. The magnet 11 is arranged on the radially outer peripheral side of the rotor core 12. In addition, the magnet 11 is a permanent magnet for excitation, for example, it can be a sintered magnet or a bonded magnet. In addition, the number of magnetic poles of the rotor 10 can also be a plurality other than eight.

[0084] The rotor core 12 is cylindrical with the central axis A as the center. The rotor core 12 is formed by stacking magnetic steel plates in the axial direction. The magnetic steel plates are, for example, silicon steel plates. The rotor core 12 has an insertion hole 12a that passes through the center portion in the axial direction. The shaft 30 (see Figure 1 ) is inserted into the insertion hole 12a. That is, the rotor core 12 has the insertion hole 12a for the shaft 30 to be inserted.

[0085] In addition, the rotor core 12 has a receiving hole 12b that receives the magnet 11 and extends in the axial direction. The receiving hole 12b is arranged on the radial outer peripheral side of the rotor core 12. The receiving hole 12b receives the magnet 11 that constitutes each magnetic pole. A plurality of receiving holes 12b are arranged at intervals in the circumferential direction. In the present embodiment, the number of magnetic poles is eight, and therefore, the number of locations where the receiving holes 12b are arranged is also eight. The locations where the eight receiving holes 12b are arranged are arranged at equal intervals in the circumferential direction.

[0086] The resin 13 enters the receiving hole 12b. Specifically, the resin 13 is disposed in a portion of the receiving hole 12b other than the portion where the magnet 11 is disposed. The resin 13 enters each of the plurality of receiving holes 12b. The resin 13 fixes the magnet 11 entering the receiving hole 12b to the rotor core 12. The resin 13 may be, for example, an epoxy resin.

[0087] In detail, the rotor core 12 of the rotor 10 configured as described above is divided into a plurality of blocks arranged in the axial direction. The rotor core 12 includes a first block 121 and a second block 122. The second block 122 is arranged in the axial direction together with the first block 121, and the position of the receiving hole 12b is offset relative to the first block 121. That is, the first block 121 and the second block 122 are arranged to have a circumferential phase angle and are skewed. By setting the structure to be skewed in this way, the cogging torque can be suppressed.

[0088] In addition, since the rotor core 12 is divided into a plurality of blocks and the plurality of blocks are skewed, in detail, the magnets 11 constituting each magnetic pole are also divided into a plurality of blocks. In addition, in detail, a receiving hole 12b for receiving the magnets 11 provided corresponding to each magnetic pole is also provided for each block. In each block, the receiving hole 12b penetrates in the axial direction.

[0089] Figure 3 It is a schematic plan view showing, in an enlarged manner, a part of the first block 121 included in the rotor core 12 according to the first embodiment. Figure 4 It is a schematic plan view showing, in an enlarged manner, a part of the second block 122 included in the rotor core 12 of the first embodiment. Figure 5 This is a schematic perspective view showing a partially enlarged view of the first block 121 and the second block 122 of the rotor core 12 of the first embodiment when viewed from obliquely above. Figure 4 The receiving hole 12b shown by the dotted line is the receiving hole of the first block 121. Figure 5 In the embodiment, the second block 122 is arranged on the upper side relative to the first block 121.

[0090] like Figure 4 and Figure 5 As shown, in each magnetic pole, the receiving hole 12b of the first block 121 and the receiving hole 12b of the second block 122 are skewed, so that they are offset in the circumferential direction and partially overlap in the axial direction.

[0091] like Figures 3 to 5 As shown, the first block 121 and the second block 122 each have a resin groove 14 for the resin 13 to enter, and the resin groove 14 is connected to the receiving hole 12b of each block 121 and 122, and extends from the axial upper end to the lower end. That is, the first block 121 has a plurality of resin grooves 14, and the plurality of resin grooves 14 are connected to the receiving holes 12b of the first block 121, and extend from the axial upper end to the lower end. In addition, the second block 122 has a plurality of resin grooves 14, and the plurality of resin grooves 14 are connected to the receiving holes 12b of the second block 122, and extend from the axial upper end to the lower end. The resin groove 14 is a groove for injecting the molten resin 13 into the receiving hole 12b when manufacturing the rotor 10.

[0092] At least a part of the resin groove 14 of the first block 121 and the resin groove 14 of the second block 122 overlap and connect in the axial direction. According to this structure, when manufacturing the rotor 10 having the rotor core 12 with a skew applied, the resin can be appropriately injected into the receiving holes 12b of the magnets 11 of each block 121 and 122 at one time in a state where the plurality of blocks 121 and 122 overlap in the axial direction. That is, the manufacturing efficiency of the rotor 10 having the rotor core 12 with a skew applied can be improved.

[0093] In addition, in this embodiment, if Figure 5As shown, the resin groove 14 of the first block 121 and the resin groove 14 of the second block 122 are mostly overlapped and connected in the axial direction. Therefore, the resin 13 can efficiently flow and fill the receiving hole 12b in a state where the first block 121 and the second block 122 are overlapped in the axial direction.

[0094] In this embodiment, as a preferred mode, the first block 121 and the second block 122 have a mark Ma for aligning the circumferential position. When the mark Ma provided on the first block 121 and the mark Ma provided on the second block 122 are aligned in the circumferential direction, the first block 121 and the second block 122 are offset in the circumferential direction as designed, and become a configuration in which the skew is correctly implemented.

[0095] In addition, as a preferred embodiment, a through hole side convex portion 1211 is provided on the inner surface of the through hole 12a, and the through hole side convex portion 1211 is engaged with a radially recessed shaft side concave portion provided on the shaft 30. The through hole side convex portion 1211 protrudes radially inward from the inner surface of the through hole 12a. The through hole side convex portion 1211 may also be marked Ma. However, as a structure in which a through hole side concave portion is provided on the inner surface of the through hole 12a to engage with a radially protruding shaft side convex portion provided on the shaft 30, the through hole side concave portion may also be marked Ma.

[0096] That is, it is also possible to provide a through hole side convex portion or concave portion on the inner surface of the through hole 12a that fits with a radially recessed shaft side concave portion or a radially protruding shaft side convex portion provided on the shaft 30, and the mark Ma is the through hole side convex portion or concave portion. Thus, the structure provided to prevent relative rotation between the shaft 30 and the rotor core 12 can be used as the mark Ma, and there is no need to specially provide the mark Ma for circumferential position alignment.

[0097] In the present embodiment, as a preferred mode, the second block 122 is the first block 121 that is axially reversed up and down so that the circumferential position of the mark Ma is aligned with the first block 121. According to this structure, the first block 121 and the second block 122 constituting the rotor core 12 can be formed using the same mold, and the manufacturing cost of the rotor 10 can be reduced.

[0098] The point that the first block 121 which is reversed upside down in the axial direction becomes the second block 122 when the position of the mark Ma in the circumferential direction is aligned with the first block 121 is mainly referred to. Figure 3 , Figure 4 and Figure 6 In addition, Figure 6 It is a schematic bottom view showing, in an enlarged manner, a part of the first block 121 included in the rotor core 12 of the first embodiment. Figure 6 Is concerned with Figure 3 The bottom view of the same receiving hole 12b.

[0099] The magnet 11 includes a first magnet F11 extending in a direction parallel to the tangential direction of the rotor core 12. Specifically, the magnet 11 is composed only of the first magnet F11. The first magnet F11 is in a rectangular parallelepiped shape. That is, the first magnet F11 is in a rectangular shape when viewed from above in the axial direction.

[0100] In addition, the receiving hole 12b includes a first magnet receiving hole F12b for receiving the first magnet F11. In detail, the receiving hole 12b is composed only of the first magnet receiving hole F12b. Like the first magnet F11, the first magnet receiving hole F12b extends in a direction parallel to the tangent direction. The first magnet receiving hole F12b is roughly trapezoidal when viewed from above in the axial direction, and the length in the direction parallel to the tangent direction is longer than that of the first magnet F11.

[0101] The resin tank 14 includes a first resin tank F14, which is radially recessed from the inner surface of the first magnet receiving hole F12b. In detail, the resin tank 14 is composed of only the first resin tank F14. In the structure having the first magnet receiving hole F12b and the first resin tank F14, a structure in which the first block 121 is reversed upside down to be used as the second block 122 can be formed with a simple structure.

[0102] In addition, in this embodiment, as a preferred mode, the first resin groove F14 is arranged radially inwardly of the first magnet F11. According to this structure, when the resin 13 is injected into the first magnet receiving hole F12b, the first magnet F11 can be pressed toward the inner surface of the radial outer side of the first magnet receiving hole F12b by the flow of the resin 13, and the magnetic properties can be improved. In addition, the resin groove 14 for injecting the resin 13 can be set at a position that is not easy to affect the magnetic properties.

[0103] Figure 7 FIG. 2 is a top view schematically showing the relationship between the first magnet F11 disposed in the first magnet receiving hole F12b and the first resin groove F14. Figure 7 As shown, as a preferred embodiment, when viewed from above in the axial direction, the maximum width D1 of the first resin groove F14 in the direction parallel to the tangent direction of the rotor core 12 is greater than the shortest radial distance D2 between the inner surface of the radial inner side of the first magnet receiving hole F12b and the first magnet F11. According to this structure, when the resin 13 is injected into the first magnet receiving hole F12b, the resin 13 can easily pass through the first resin groove F14 and spread over the upper and lower parts of the rotor core 12. Therefore, in each block 121, 122, the position of the first magnet F11 received in the first magnet receiving hole F12b can be configured at an appropriate position by the flowing resin 13. The shortest distance D2 is preferably about half of the maximum width D1 or less than half.

[0104] In addition, as a preferred embodiment, when viewed from above in the axial direction, the first resin slot F14 is semicircular. In this case, the maximum width D1 of the first resin slot F14 in a direction parallel to the tangent direction of the rotor core 12 is equal to the diameter of the first resin slot F14. According to this structure, the area where the first resin slot F14 is provided can be configured to be as small as possible, and when injecting the resin 13, the injection amount of the resin 13 into the first magnet receiving hole F12b can be easily ensured. By minimizing the area where the first resin slot F14 is provided, the influence of the provision of the first resin slot F14 on the magnetic properties can be suppressed.

[0105] like Figure 3 and Figure 6 As shown, the position of the first resin groove F14 is offset from the center position of the first magnet receiving hole F12b in a direction parallel to the tangential direction of the rotor core 12 when viewed from above in the axial direction. Figure 3 and Figure 6 In the figure, the single-point dashed line L1 is a line connecting the center axis A and the center position of the first magnet receiving hole F12b in a direction parallel to the tangent direction of the rotor core 12. In addition, the dotted line L2 is a line connecting the center axis A and a specific point of the first resin tank F14. The specific point is, for example, the radially innermost point of the first resin tank F14. In addition, the mark Ma (the through-hole side protrusion 1211) provided for circumferential position alignment is provided at the position where the dotted line L2 passes.

[0106] As described above, the position of the first resin groove F14 and the mark Ma are offset from the center position of the first magnet receiving hole F12b, so when the first block 121 is viewed from above, Figure 3 In FIG. 1 , the dotted line L2 is offset by θ degrees in the clockwise direction relative to the dotted line L1. Figure 6 In FIG. 1 , the dotted line L2 is offset by θ degrees in the counterclockwise direction relative to the single-dot chain line L1.

[0107] Therefore, in order to overlap the first block 121 which is reversed in the axial direction and the first block 121, and align the circumferential position of the mark Ma, the first block 121 is rotated 2θ degrees in the clockwise direction. Figure 5 As shown, the first block 121 and the second block 122 are configured so that the circumferential positions of the first resin grooves F14 provided in the first block 121 and the second block 122 are aligned and skewed. That is, by configuring the first resin groove F14 to deviate from the center position of the first magnet receiving hole F12b, a structure in which the second block 122 is formed by reversing the top and bottom of the first block 121 can be obtained, thereby reducing the manufacturing cost.

[0108] Figure 8 FIG. 1 is a side view schematically showing the rotor 10 according to the first embodiment. Figure 8In FIG. 1 , the thick line MC represents the center position of the magnetic poles of each block 121 and 122 when focusing on a certain magnetic pole of the rotor 10. Figure 2 and Figure 8 As shown, in this embodiment, the first block 121 and the second block 122 are arranged in contact with each other in the axial direction. By setting such a structure, the rotor core 12 with a skewed shape having three or four blocks, for example, can be manufactured at low cost. In addition, in this embodiment, the number of blocks constituting the rotor core 12 is four.

[0109] In this embodiment, if Figure 8 As shown, the block group in which the first block 121 and the second block 122 are arranged in contact with each other in the axial direction is arranged to be line symmetrical with respect to the bisecting plane SC1 that axially bisects the rotor core 12. In this embodiment, when manufacturing the rotor core 12 having four blocks and applying skew, the number of molds for constituting the blocks can be set to one, so that the rotor 10 can be manufactured at a low cost.

[0110] In this embodiment, the first resin grooves F14 provided in each of the four blocks constituting the rotor core 12 are overlapped and connected in the axial direction. That is, the resin 13 can be appropriately injected into the first magnet receiving holes F12b of each block at one time in a state where the four blocks overlap in the axial direction.

[0111] like Figure 3 and Figure 4 As shown, each of the first block 121 and the second block 122 has a positioning protrusion 15 on the inner surface of the receiving hole 12b, and the positioning protrusion 15 determines the position of the long side direction of the magnet 11 when viewed from the axial top view. In detail, a pair of positioning protrusions 15 protruding toward the radial outside are provided on the radial inner surface of the first magnet receiving hole F12b. When viewed from the axial top view, the pair of positioning protrusions 15 contact the two ends of the long side direction of the first magnet F11 and inhibit the movement of the first magnet F11 in the long side direction. That is, the first magnet F11 can be arranged in an appropriate position.

[0112] As a preferred mode, in the axial direction of the receiving hole 12b of each block 121, 122, the area where the positioning protrusion 15 exists is smaller than the area where the positioning protrusion 15 does not exist. According to this structure, the positioning protrusion 15 is formed on the inner surface of the receiving hole 12b to locate the position of the magnet 11, and the formation range of the positioning protrusion 15 in each block 121, 122 is minimized, which can make it difficult to prevent the flow of the resin 13 when the resin 13 is injected into the receiving hole 12b.

[0113] In order to achieve such a structure, for example, as the plurality of magnetic steel plates constituting each of the blocks 121 and 122 , a structure using the first magnetic steel plate 120A and the second magnetic steel plate 120B may be adopted. Fig.9A It is a plan view schematically showing the structure of the first magnetic steel plate 120A. Fig. 9B It is a plan view schematically showing the structure of the second magnetic steel plate 120B.

[0114] like Fig.9A As shown, the first magnetic steel plate 120A has a convex portion 150 constituting the positioning convex portion 15 formed at a receiving hole constituting portion 1201 constituting the receiving hole 12b for accommodating the magnet 11. Fig. 9B As shown, the second magnetic steel plate 120B is not provided with the protrusion 150 constituting the positioning protrusion 15 at the receiving hole constituting portion 1201 constituting the receiving hole 12 b for accommodating the magnet 11 .

[0115] Fig.10 1 is a diagram schematically showing a stacking pattern of magnetic steel plates of blocks 121 and 122 formed using first magnetic steel plates 120A and second magnetic steel plates 120B. Fig.10 As shown, in the axial direction, the portion where the protrusion 150 is located is the region R1 where the positioning protrusion 15 exists, and the portion where the protrusion 150 is not located is the region R2 where the positioning protrusion 15 does not exist. In each block 121, 122, the number of stacked sheets of the second magnetic steel sheet 120B is greater than the number of stacked sheets of the first magnetic steel sheet 120A. Thus, in the axial direction of the receiving hole 12b of each block 121, 122, the region R1 where the positioning protrusion 15 exists can be configured to be smaller than the region R2 where the positioning protrusion 15 does not exist.

[0116] <2-2. Second embodiment>

[0117] Next, a rotor 10A according to a second embodiment will be described. In the description of the second embodiment, descriptions of contents overlapping with those of the first embodiment will be omitted as much as possible.

[0118] Fig.11 1 is a perspective view showing a schematic structure of a rotor 10A according to the second embodiment. Fig.11 As shown, similar to the first embodiment, a rotor 10A of the second embodiment includes: magnets 11A constituting respective magnetic poles; a rotor core 12A having housing holes 12Ab for housing the magnets 11A; and a resin 13A entering the housing holes 12Ab.

[0119] In the second embodiment, the number of magnetic poles of the rotor 10A is also eight, as in the first embodiment, and the rotor 10A has a magnet 11A constituting each of the eight magnetic poles. In this embodiment, the magnet 11A also includes a pair of second magnets S11A that form a V-shape when viewed from above in the axial direction. That is, the magnets 11A constituting each magnetic pole include a first magnet F11A and a pair of second magnets S11A.

[0120] Since the first magnet F11A has the same structure as the first magnet F11 of the first embodiment, its description is omitted here. The pair of second magnets S11A are arranged to be line-symmetrical with respect to a line extending radially from the central axis A. The pair of second magnets S11A are arranged so that the circumferential spacing between the two becomes narrower as they move radially inward. At least a portion of the first magnet F11A is arranged radially outward of the pair of second magnets S11A. Magnet 11A is a so-called Each second magnet S11A is in the shape of a cuboid, and is rectangular when viewed from above in the axial direction.

[0121] In the second embodiment, the rotor core 12A is cylindrical with the central axis A as the center, and has a shaft 30 (see Figure 1 The rotor core 12A includes a first block 121A and a second block 122A, which is arranged along the axial direction with the first block 121A and is configured so that the position of the receiving hole 12Ab is offset relative to the first block 121A. That is, the first block 121A and the second block 122A are skewed structures.

[0122] In the second embodiment, the first block 121A which is reversed in the axial direction up and down also becomes the second block 122A when it is arranged so that the circumferential position of the mark Ma is aligned with the first block 121A. Figure 8 ), the block group in which the first block 121A and the second block 122A are arranged in contact with each other in the axial direction is configured to be line symmetrical with respect to a bisecting plane SC1 that bisects the rotor core 12A in the axial direction.

[0123] Fig.12 1 is a schematic top view showing the structure of the first block 12A of the rotor core 12A of the second embodiment. In addition, since the second block 122A is obtained by inverting the first block 121A upside down, the detailed structure description thereof is omitted. Fig.12 As shown, the receiving hole 12Ab further includes a pair of second magnet receiving holes S12Ab for receiving a pair of second magnets S11A. That is, the receiving hole 12Ab includes a first magnet receiving hole F12Ab and a pair of second magnet receiving holes S12Ab.

[0124] Since the first magnet receiving hole F12Ab is the same structure as the first magnet receiving hole F12b of the first embodiment, its description is omitted here. A pair of second magnet receiving holes S12Ab form a V-shape when viewed from above in the axial direction. In detail, a pair of second magnet receiving holes S12Ab is configured so that the circumferential spacing between the two becomes narrower as it moves radially inward. When viewed from above in the axial direction, each second magnet receiving hole S12Ab is longer than the length of the second magnet S11A in a direction parallel to the long side direction of the second magnet S11A received. In addition, it is preferred that, as with the first magnet receiving hole F12Ab, a positioning protrusion for determining the long side direction position of the second magnet S11A is provided at each second magnet receiving hole S12Ab.

[0125] The first block 121A has a resin groove 14A for the resin 13A to enter, and the resin groove 14A is connected to the receiving hole 12Ab and extends from the axial upper end to the lower end. The resin groove 14A also includes a second resin groove S14A, and the second resin groove S14A is circumferentially recessed from the inner surface of each of a pair of second magnet receiving holes S12Ab. That is, the resin groove 14A includes a first resin groove F14A and a second resin groove S14A. Since the first magnet F14A has the same structure as the first magnet F14 of the first embodiment, the description is omitted here. The second resin groove S14A extends from the upper end to the lower end of the first block 121A. The details of the second resin groove S14A will be described later.

[0126] As in the first embodiment, the first resin groove F14A of the first block 121A and the first resin groove F14A of the second block 122A can be configured so that at least a portion thereof overlaps and communicates in the axial direction. In addition, the second resin groove S14A of the first block 121A and the second resin groove S14A of the second block 122A can also be configured so that at least a portion thereof overlaps and communicates in the axial direction. Therefore, even if the magnets 11A constituting each magnetic pole are composed of In the case of a plurality of magnets of the same type, the resin can be appropriately injected into the receiving holes 12Ab of the magnets 11A of the blocks 121A and 122A all at once in a state where the plurality of blocks 121A and 122A are overlapped in the axial direction.

[0127] like Fig.12 As shown, the outer edge of the second magnet receiving hole S12Ab has a first outer edge portion OE1 and a second outer edge portion OE2 facing each other in the short side direction of the second magnet S11A when viewed from above in the axial direction. In this embodiment, the outer edge of the second magnet receiving hole S12Ab is rectangular. The first outer edge portion OE1 and the second outer edge portion OE2 are linear.

[0128] The first outer edge portion OE1 is arranged radially inwardly than the second outer edge portion OE2. The second resin groove S14A is provided on the inner surface extending axially from the first outer edge portion OE1. The second resin groove S14A is recessed relative to the inner surface extending axially from the first outer edge portion OE1, and extends from the axial upper end to the lower end. According to the present structure, when the resin 13A is injected into the second magnet receiving hole S12Ab, the second magnet S11A can be pressed toward the inner surface extending axially from the second outer edge portion OE2 by the flow of the resin 13A. That is, according to the present structure, the second magnet S11A can be pressed toward the inner surface of the radially outer side of the second magnet receiving hole S12Ab, thereby improving the magnetic properties.

[0129] In the present embodiment, when viewed from above in the axial direction, the second resin groove S14A is disposed in the central portion of the first outer edge portion OE1 in a direction parallel to the long side direction of the second magnet S11A. However, the position where the second resin groove S14A is disposed may also be a position offset from the above-mentioned central portion. In addition, when viewed from above in the axial direction, a pair of second magnet receiving holes S12Ab are configured to be line symmetrical with respect to a line extending radially from the center axis A. Therefore, at one side and the other side of the pair of second magnet receiving holes S12Ab, the circumferential direction of the second resin groove S14A recessed from the inner surface of the second magnet receiving hole S12Ab is opposite.

[0130] In addition, similar to the pair of second magnet receiving holes S12Ab, the second resin groove S14A provided in each of the pair of second magnet receiving holes S12Ab is also linearly symmetrical when viewed from above in the axial direction, but it may not be linearly symmetrical. In this embodiment, it is a non-linearly symmetrical structure. In addition, the second resin groove S14A may also be configured to be provided on an inner surface extending axially from the second outer edge portion OE2, rather than an inner surface extending axially from the first outer edge portion OE1.

[0131] The second resin tank S14A provided in the first block 121A is described in more detail. Preferably, when viewed from above in the axial direction, the second resin tank S14A has a length W2 in the direction orthogonal to the width W1 in the direction parallel to the long side direction of the second magnet S11A, at least at the upper end and the lower end in the axial direction, which is longer (see Fig.12 By configuring the second resin groove S14A to extend long in the circumferential direction, it is possible to easily communicate with the second resin grooves S14A of other blocks that are skewed and overlapped in the axial direction, so that the resin can be appropriately injected all at once in an overlapping state.

[0132] The second resin tank S14A provided in the first block 121A may also be a structure extending long in the circumferential direction from the upper end to the lower end in the axial direction as described above. However, in this embodiment, it is not a structure extending long in the circumferential direction from the upper end to the lower end. This is described below.

[0133] The rotor core 12A is formed by stacking magnetic steel plates in the axial direction. That is, the first block 121A and the second block 122A are formed by stacking magnetic steel plates in the axial direction. In the first block 121A and the second block 122A, the groove portion 140 (see below) of the second resin groove S14A is formed at the end magnetic steel plates 120C, which are the magnetic steel plates at the axial upper and lower ends, and at the intermediate magnetic steel plates 120D, which are the magnetic steel plates arranged in the axial direction between the end magnetic steel plates 120C at the axial upper and lower ends. Fig.13A etc.) in different shapes.

[0134] In addition, in the present embodiment, the number of the intermediate magnetic steel plates 120D is plural. Hereinafter, the end magnetic steel plate 120C at the upper end in the axial direction is sometimes referred to as the upper end magnetic steel plate 120CU. In addition, the end magnetic steel plate 120C at the lower end in the axial direction is sometimes referred to as the lower end magnetic steel plate 120CL.

[0135] Fig.13A It is a schematic plan view showing the structure of a part of the upper end magnetic steel plate 120CU. Fig. 13B It is a schematic plan view showing the structure of a part of the lower end magnetic steel plate 120CL. Fig. 13C 1 is a schematic top view showing the structure of a portion of the intermediate magnetic steel plate 12D. FIG. 13A to FIG. 13C In the figure, reference numeral 1202 denotes a second magnet receiving hole constituting portion constituting a second magnet receiving hole S12Ab formed by stacking magnetic steel plates.

[0136] like Fig.13A As shown, in the upper end magnetic steel plate 120CU, the groove 140 provided in one of the pair of second magnet receiving hole forming parts 1202 is an elongated groove 140a extending relatively long in the circumferential direction. In addition, in the elongated groove 140a, the length W2 in the direction orthogonal to the width W1 in the direction parallel to the long side direction of the second magnet S11A received in the second magnet receiving hole S12Ab is longer. Fig.12 The width W1 and length W2 are defined in the same way as in the case of FIG.

[0137] On the other hand, in the upper end magnetic steel plate 120CU, the other groove portion 140 provided in the pair of second magnet receiving hole forming parts 1202 is a short groove portion 140b. In the short groove portion 140b, the width W1 in the direction parallel to the long side direction of the second magnet S11A received in the second magnet receiving hole S12Ab is equal to the length W2 in the orthogonal direction. In the present embodiment, the short groove portion 140b is semicircular when viewed from above in the axial direction. In addition, in the upper end magnetic steel plate 120CU, the long groove portion 140a provided in one of the pair of second magnet receiving hole forming parts 1202 and the short groove portion 140b provided in the other are arranged at intervals in the circumferential direction.

[0138] like Fig. 13B As shown, in the intermediate magnetic steel plate 120D, a pair of second magnet receiving hole forming parts 1202 are respectively provided with short groove portions 140b. The two short groove portions 140b are arranged at intervals in the circumferential direction. The short groove portion 140b provided in the intermediate magnetic steel plate 120D and the short groove portion 140b provided in the upper end magnetic steel plate 120CU have the same shape and size. In addition, the radial position of the short groove portion 140b provided in the intermediate magnetic steel plate 120D is the same as the radial position of the long groove portion 140a and the short groove portion 140b provided in the upper end magnetic steel plate 120CU. That is, the short groove portion 140b provided in the intermediate magnetic steel plate 120D and the long groove portion 140a and the short groove portion 140b provided in the upper end magnetic steel plate 120CU overlap in the axial direction.

[0139] like Fig. 13C As shown, in the lower end magnetic steel plate 120CL, the groove portion 140 provided in one of the pair of second magnet receiving hole forming parts 1202 is a short groove portion 140b. The groove portion 140 provided in the other of the pair of second magnet receiving hole forming parts 1202 is a long groove portion 140a. That is, at the lower end magnetic steel plate 120CL and the upper end magnetic steel plate 120CU, the structures of the groove portions 140 provided in one and the other of the pair of second magnet receiving hole forming parts 1202 are opposite. The structures of the long groove portion 140a and the short groove portion 140b provided in the lower end magnetic steel plate 120CL are the same as those of the upper end magnetic steel plate 120CU, except that which one of the pair of second magnet receiving hole forming parts 1202 is provided in the opposite direction.

[0140] When the first block 121A is formed by arranging the upper magnetic steel plate 120CU, the middle magnetic steel plates 120D stacked in the axial direction, and the lower magnetic steel plate 120CL in this order from top to bottom, at least a portion of the grooves 140 provided in each magnetic steel plate is arranged in the axial direction. The second resin groove S14A extends from the upper end to the lower end of the first block 121A.

[0141] As can be seen from the above description, in this embodiment, the end magnetic steel plate 120C has a groove portion 140 that extends longer in the circumferential direction than the groove portion 140 of the middle magnetic steel plate 120D. If configured in this way, it is possible to ensure communication with the second resin groove S14A of other blocks that are skewed and overlap in the axial direction, and it is possible to minimize the area where the second resin groove S14A is provided on the block. That is, according to this structure, it is possible to easily perform the injection operation of the resin 13A into the second magnet receiving hole S12Ab in the rotor core 12A that has been skewed, and it is possible to suppress the influence of the second resin groove S14A on the magnetic properties.

[0142] In addition, the structure of the groove 140 provided in the pair of second magnet receiving hole forming parts 1202 may be made the same at the upper end magnetic steel plate 120CU and the lower end magnetic steel plate 120CL. That is, the groove 140 provided in the pair of second magnet receiving hole forming parts 1202 in the upper end magnetic steel plate 120CU and the lower end magnetic steel plate 120CL may also be configured as the elongated groove 140a.

[0143] Fig.14 1 is a diagram schematically showing a cross-sectional view of a portion of a block group in which a first block 121A and a second block 122A of a rotor core 12A according to the second embodiment overlap in the axial direction. Fig.14 As shown, the second resin tank S14A of the first block 121A and a portion of the second resin tank S14A of the second block 122A overlap and communicate with each other in the axial direction.

[0144] In the present embodiment, the rotor core 12A also has a structure in which the first block 121A and the second block 122A are arranged in contact with each other in the axial direction and are arranged in a line-symmetrical manner with respect to a bisecting plane SC1 that bisects the rotor core 12A in the axial direction (see Figure 8 Therefore, a part of the second resin grooves S14A respectively provided in the four blocks also overlaps and communicates in the axial direction. That is, the resin 13A can be appropriately injected into the second magnet receiving holes S12Ab of each block at one time in a state where the four blocks overlap in the axial direction.

[0145] (2-3. Modification Example)

[0146] Modifications of the rotors 10 and 10A will be described below.

[0147] [2-3-1. First Modification]

[0148] In the structure of the second embodiment, the first magnet F11A and the first magnet receiving hole F12Ab may not be provided. In addition, for example, instead of the first magnet F11A and the first magnet receiving hole F12Ab, a magnet and a magnet receiving hole having the same structure as a pair of second magnets S11A and a pair of second magnet receiving holes S12Ab may be provided. That is, the technology disclosed in the present invention can be widely applied to a structure in which the magnets constituting each magnetic pole include a pair of second magnets constituting a V-shape.

[0149] [2-3-2. Second Modification]

[0150] In the structure of the second embodiment, instead of the pair of second magnets S11A and the pair of second magnet receiving holes S12Ab, magnets and magnet receiving holes having the same structure as the first magnets F11A and the first magnet receiving holes F12Ab may be provided.

[0151] [2-3-3. Third Modification]

[0152] In the above description, the case where the number of blocks constituting the rotor core 12 , 12A is four is described. However, the number of blocks including the first block 121 , 121A and the second block 122 , 122A may be three or five or more.

[0153] The rotor core may also have at least one block disposed axially between the first block 121, 121A and the second block 122, 122A, and the position of the magnetic pole of the rotor core may be configured to be line symmetrical with respect to a bisecting plane that bisects the rotor core in the axial direction. Even with such a structure, the resin grooves 14, 14A of the first block 121, 121A and the resin grooves 14, 14A of the second block 122, 122A may be overlapped and connected in the axial direction at least in part, or may be connected via a resin groove of at least one other block disposed axially between the first block 121, 121A and the second block 122, 122A. That is, according to this structure, a rotor having a rotor core in which, for example, five, six, eight, etc. blocks are arranged in a skewed manner can be manufactured at a low cost.

[0154] Fig.15 1 is a diagram showing a configuration example of a rotor 10B in which a rotor core 12B is composed of five blocks including first blocks 121 and 121A and second blocks 122 and 122A. Fig.15 In FIG. 1 , a thick line MC indicates the center position of the magnetic pole of each block when focusing on a certain magnetic pole included in the rotor 10B.

[0155] exist Fig.15In the example shown, the first block 121, 121A is arranged at the center position in the axial direction. The third block 123, the second block 122, 122A are arranged on the first block 121, 121A arranged in the center in order from below. In addition, the third block 123, the second block 122, 122A are arranged under the first block 121, 121A arranged in the center in order from above. The position of the magnetic pole of the rotor core 12B is arranged to be line symmetrical with respect to the bisecting plane SC2 that bisects the rotor core 12B in the axial direction.

[0156] The third block 123 is a structure different from the first block 121, 121A and the second block 122, 122A. For example, when the first block and the second block are the first block 121 and the second block 122 of the first embodiment, the position of the first resin groove F14 provided in the third block 123 may be the center position of the first magnet receiving hole F12b when viewed from above in the axial direction. If so configured, in the rotor core 12B having a skewed structure, it is possible to configure the resin grooves of the five blocks to overlap in the axial direction at least in part.

[0157] Fig.16 1 is a diagram showing a configuration example of a rotor 10C in which a rotor core 12C is composed of eight blocks including first blocks 121 and 121A and second blocks 122 and 122A. Fig.16 In FIG. 1 , a thick line MC indicates the center position of the magnetic pole of each block when focusing on a certain magnetic pole included in the rotor 10C.

[0158] exist Fig.16 In the example shown, the block group of the first block 121, 121A, the fourth block 124, the fifth block 125, and the second block 122, 122A arranged in this order from the bottom is line-symmetrical with respect to the bisecting plane SC3 that bisects the rotor core 12C in the axial direction. In this case, the positions of the magnetic poles of the rotor core 12C are also arranged to be line-symmetrical with respect to the bisecting plane SC3 that bisects the rotor core 12C in the axial direction.

[0159] The fourth block 124 and the fifth block 125 have different structures from the first block 121, 121A and the second block 122, 122A. In this structure, the fourth block 124 and the fifth block 125 may be a common structure by turning upside down, like the first block 121, 121A and the second block 122, 122A.

[0160] <3. Notes>

[0161] Various technical features disclosed in this specification can be modified in various ways without departing from the scope of its technical creation. In addition, multiple embodiments and modified examples shown in this specification can also be combined and implemented within a feasible range.

[0162] Industrial Applicability

[0163] The technology disclosed herein can be used, for example, in home appliances, automobiles, ships, airplanes, trains, electric-assisted bicycles, wind turbines, and the like.

Claims

1. A rotor for an inner rotor type rotating electrical machine having a plurality of magnetic poles in a circumferential direction centered on a central axis extending vertically, wherein: have: a magnet, wherein the magnet constitutes each of the magnetic poles; A rotor core, wherein the rotor core has a receiving hole, the receiving hole receives the magnet and extends in the axial direction; as well as resin, the resin enters the receiving hole, The rotor core has: The first piece; as well as a second block, the second block being arranged together with the first block in the axial direction and configured so that the circumferential position of the receiving hole is offset relative to the first block, The first block and the second block each have a resin groove for the resin to enter, the resin groove is connected to the receiving hole of each block and extends from the axial upper end to the lower end. The resin tank of the first block and the resin tank of the second block are at least partially overlapped and connected in the axial direction, or are connected via the resin tank of at least one other block arranged between the first block and the second block in the axial direction. The resin tank is located at a position corresponding to the long side of the magnet, When viewed from above in the axial direction, the resin groove has a length in a direction orthogonal to the longitudinal direction of the magnet that is longer than its width in a direction parallel to the longitudinal direction of the magnet at least at one of the upper end and the lower end in the axial direction. The width of the resin tank in a direction parallel to the long side direction of the magnet is shorter than the width of the long side direction of the magnet. The magnet includes a pair of second magnets that form a V-shape when viewed from above in the axial direction. The receiving holes include a pair of second magnet receiving holes for receiving the pair of second magnets. The resin groove includes a second resin groove recessed in a circumferential direction from an inner surface of each of the pair of second magnet receiving holes.

2. The rotor according to claim 1, wherein: The outer edge of the second magnet receiving hole has a first outer edge portion and a second outer edge portion facing each other in the short side direction of the second magnet when viewed from above in the axial direction. The first outer edge portion is arranged radially inward of the second outer edge portion. The second resin groove is provided on an inner surface extending in the axial direction from the first outer edge portion.

3. The rotor according to claim 1 or 2, wherein: When viewed from above in the axial direction, the second resin groove has a length in a direction perpendicular to the longitudinal direction of the second magnet greater than a width in a direction parallel to the longitudinal direction of the second magnet at least at one of an upper end and a lower end in the axial direction.

4. The rotor according to claim 3, wherein: The rotor core is formed by stacking magnetic steel plates in the axial direction. In the first block and the second block, The shape of the groove portion constituting the second resin tank is different at the end magnetic steel plates at the axial upper and lower ends and at the intermediate magnetic steel plates arranged axially between the end magnetic steel plates at the axial upper and lower ends. The end magnetic steel plate has the groove portion extending longer in the circumferential direction than the groove portion of the middle magnetic steel plate.

5. A rotor for an inner rotor type rotating electrical machine having a plurality of magnetic poles in a circumferential direction centered on a central axis extending vertically, wherein: have: a magnet, wherein the magnet constitutes each of the magnetic poles; A rotor core, wherein the rotor core has a receiving hole, the receiving hole receives the magnet and extends in the axial direction; as well as resin, the resin enters the receiving hole, The rotor core has: The first piece; as well as a second block, the second block being arranged together with the first block in the axial direction and configured so that the circumferential position of the receiving hole is offset relative to the first block, The first block and the second block each have a resin groove for the resin to enter, the resin groove is connected to the receiving hole of each block and extends from the axial upper end to the lower end. The resin tank of the first block and the resin tank of the second block are at least partially overlapped and connected in the axial direction, or are connected via the resin tank of at least one other block arranged between the first block and the second block in the axial direction. The resin tank is located at a position corresponding to the long side of the magnet, When viewed from above in the axial direction, the resin groove has a length in a direction orthogonal to the longitudinal direction of the magnet that is longer than its width in a direction parallel to the longitudinal direction of the magnet at least at one of the upper end and the lower end in the axial direction. The width of the resin tank in a direction parallel to the long side direction of the magnet is shorter than the width of the long side direction of the magnet. The magnets include a first magnet extending in a direction parallel to a tangential direction of the rotor core, The receiving hole comprises a first magnet receiving hole for receiving the first magnet, The resin tank includes a first resin tank recessed in a radial direction from an inner surface of the first magnet receiving hole. The magnet further includes a pair of second magnets forming a V-shape when viewed from above in the axial direction. The receiving hole also includes a pair of second magnet receiving holes for receiving the pair of second magnets. The resin tank further includes a second resin tank recessed along the circumferential direction from the inner surface of each of the pair of second magnet receiving holes. At least a portion of the first magnet is arranged radially outward of the pair of second magnets.

6. The rotor according to claim 5, wherein: The outer edge of the second magnet receiving hole has a first outer edge portion and a second outer edge portion facing each other in the short side direction of the second magnet when viewed from above in the axial direction. The first outer edge portion is arranged radially inward of the second outer edge portion. The second resin groove is provided on an inner surface extending in the axial direction from the first outer edge portion.

7. The rotor according to claim 5 or 6, wherein: When viewed from above in the axial direction, the second resin groove has a length in a direction perpendicular to the longitudinal direction of the second magnet greater than a width in a direction parallel to the longitudinal direction of the second magnet at least at one of an upper end and a lower end in the axial direction.

8. The rotor according to claim 7, wherein: The rotor core is formed by stacking magnetic steel plates in the axial direction. In the first block and the second block, The shape of the groove portion constituting the second resin tank is different at the end magnetic steel plates at the axial upper and lower ends and at the intermediate magnetic steel plates arranged axially between the end magnetic steel plates at the axial upper and lower ends. The end magnetic steel plate has the groove portion extending longer in the circumferential direction than the groove portion of the middle magnetic steel plate.

9. A rotor for an inner rotor type rotating electrical machine having a plurality of magnetic poles in a circumferential direction centered on a central axis extending vertically, wherein: have: a magnet, wherein the magnet constitutes each of the magnetic poles; A rotor core, wherein the rotor core has a receiving hole, the receiving hole receives the magnet and extends in the axial direction; as well as resin, the resin enters the receiving hole, The rotor core has: The first piece; as well as a second block, the second block being arranged together with the first block in the axial direction and configured so that the circumferential position of the receiving hole is offset relative to the first block, The first block and the second block each have a resin groove for the resin to enter, the resin groove is connected to the receiving hole of each block and extends from the axial upper end to the lower end. The resin tank of the first block and the resin tank of the second block are at least partially overlapped and connected in the axial direction, or are connected via the resin tank of at least one other block arranged between the first block and the second block in the axial direction. The magnet includes a pair of second magnets that form a V-shape when viewed from above in the axial direction. The receiving holes include a pair of second magnet receiving holes for receiving the pair of second magnets. The resin groove includes a second resin groove that is recessed in the circumferential direction from a surface parallel to the long side direction of the second magnet in each inner surface of the pair of second magnet receiving holes. The rotor core is formed by stacking magnetic steel plates in the axial direction. In the first block and the second block, The shape of the groove portion constituting the second resin tank is different at the end magnetic steel plates at the axial upper and lower ends and at the intermediate magnetic steel plates arranged axially between the end magnetic steel plates at the axial upper and lower ends. The end magnetic steel plate has the groove portion extending longer in the circumferential direction than the groove portion of the middle magnetic steel plate.

10. A rotating electrical machine, wherein: have: The rotor according to any one of claims 1 to 9; and The stator is arranged radially outside the rotor.

11. A driving device, wherein: have: The rotating electrical machine according to claim 10; and A gear unit is connected to the rotating electric machine.

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