Rotor, rotating electrical machine, drive device and moving body

Abstract

The rotor has a first rotor core and a second rotor core arranged in the axial direction and configured so that the positions of the magnetic poles are staggered from each other in the circumferential direction. The first rotor core and the second rotor core have a pair of first magnets constituting the magnetic poles and a pair of first magnet receiving holes for receiving the pair of first magnets. The first rotor core has a plurality of magnetic flux blocking parts that penetrate in the axial direction, and has a first magnetic flux blocking part and a second magnetic flux blocking part that overlap with the first magnet receiving hole of the second rotor core in at least a part in the axial direction. An imaginary line connecting the circumferential middle position of the pair of first magnets and the central axis is set as the first axis, and an imaginary line that is adjacent to the first axis in the circumferential direction and is magnetically orthogonal to the first axis and passes through the central axis is set as the second axis. The first magnetic flux blocking part is arranged between the first axis and the circumference of the first magnet, and the second magnetic flux blocking part is arranged on the second axis.

Description

Technical Field

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

[0002] Conventionally, a rotor laminated core manufactured by fixing a permanent magnet to a laminated body by resin sealing is known (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 the divided rotor cores are assembled with the respective divided rotor cores staggered at a predetermined angle.

[0003] The permanent magnet is inserted into the magnet insertion part of the rotor core and fixed with a filler. In the skew structure, since the position of the magnet insertion part is offset between the split rotor cores, when the magnet insertion part is filled with filler after stacking a plurality of split rotor cores, there is a possibility that the filler cannot fully fill the magnet insertion part. For this reason, in the prior art, the filler is filled into the magnet insertion part for each split layer. In this case, the operation needs to be repeated according to the number of split layers, and there is a concern that the manufacturing process may become complicated.

[0004] Therefore, it is known to divide the rotor core into multiple layers in the axial direction, arrange and implement skew with a circumferential phase angle between each layer, and make a rotor having the above-mentioned rotor core and permanent magnets forming poles into the following structure (for example, refer to patent document 2). The rotor core has an insertion hole for inserting the permanent magnet and at least one intermediate hole independently arranged between the poles from the insertion hole. The insertion hole of the rotor core of a certain layer is connected to the intermediate hole of the adjacent layer. According to this structure, it is possible to ensure a supply path for the filler to the insertion hole of the permanent magnet through the intermediate hole, so that a rotor having a rotor core with skew implemented 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 an intermediate hole is provided between the poles formed by the above-mentioned permanent magnet, the intermediate hole may affect the magnetic characteristics such as torque ripple due to, for example, the angle or skew angle of the permanent magnet. Summary of the invention

[0010] An object of the present disclosure is to provide a technology capable of achieving reduction in torque ripple and improvement in manufacturing efficiency in a rotor having a skew structure.

[0011] The exemplary rotor of the present disclosure is a rotor that rotates around a central axis, and has a first rotor core and a second rotor core that are arranged in the axial direction and whose magnetic poles are arranged in a staggered manner in the circumferential direction. The first rotor core and the second rotor core respectively have: a pair of first magnets that are arranged in a V-shape and whose circumferential spacing becomes wider as they move toward the radial outside, and that constitute the magnetic poles; and a pair of first magnet receiving holes that receive the pair of first magnets. The first rotor core also has a plurality of flux blocking portions that penetrate in the axial direction. The plurality of flux blocking portions include a first flux blocking portion and a second flux blocking portion, and the first flux blocking portion and the second flux blocking portion overlap at least partially with the first magnet receiving hole of the second rotor core in the axial direction. When viewed from above from the axial direction, an imaginary line connecting the circumferential middle position of the pair of first magnets and the central axis is set as the first axis, and an imaginary line that is adjacent to the first axis in the circumferential direction and is magnetically orthogonal to the first axis and passes through the central axis is set as the second axis. The first magnetic flux blocking portion is arranged between the first axis and the circumference of the first magnet, and the second magnetic flux blocking portion is arranged on the second axis.

[0012] An exemplary rotating electric machine of the present disclosure has a rotor of the above-described structure and a stator disposed radially outside the rotor.

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

[0014] An exemplary moving body of the present invention includes: a driving device having the above-described structure; and a moving action unit connected to the driving device and capable of moving itself.

[0015] (Effects of the Invention)

[0016] According to the present disclosure, in a rotor having a skew structure, reduction in torque ripple and improvement in manufacturing efficiency can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram showing the structure of a moving object according to an embodiment of the present disclosure.

[0018] Figure 2 It is a diagram schematically showing the structure of a driving device according to an embodiment of the present disclosure.

[0019] Figure 3 1 is a side view schematically showing the structure of a rotor according to the first embodiment of the present disclosure.

[0020] Figure 4 It is a plan view showing a schematic structure of a first rotor core included in the rotor according to the first embodiment.

[0021] Figure 5 It is schematically shown Figure 4 A top view of the detailed structure of the first rotor core is shown.

[0022] Figure 6 It is shown Figure 5 A diagram showing the relationship between a first rotor core and a second rotor core disposed below the first rotor core.

[0023] Figure 7 It is a plan view schematically showing the structure of a portion of the first rotor core after resin injection.

[0024] Figure 8 It is a diagram for explaining the details of the arrangement of the first magnetic flux barrier portion and the second magnetic flux barrier portion.

[0025] Fig. 9 : is a graph showing the experimental results for explaining the arrangement of the second magnetic flux barrier portion.

[0026] Fig.10 It is a plan view showing the structure of a first rotor core included in the rotor according to the second embodiment.

[0027] Fig.11 It is shown Fig.10 A diagram showing the relationship between a first rotor core and a second rotor core disposed below the first rotor core.

[0028] Fig.12 It is a plan view schematically showing the structure of a portion of the first rotor core after resin injection.

[0029] Fig.13 It is a diagram for explaining the details of the arrangement of a plurality of magnetic flux barriers included in the first rotor core according to the second embodiment.

[0030] Fig.14 : is a graph showing the experimental results for explaining the arrangement of the third magnetic flux barrier portion.

[0031] Fig.15 : is a first graph showing experimental results for explaining the arrangement of the fourth magnetic flux barrier portion.

[0032] Fig.16 2 is a second graph showing experimental results for explaining the arrangement of the fourth magnetic flux barrier portion.

[0033] Fig.17 It is a diagram for explaining a second rotor core included in the rotor according to the second embodiment. DETAILED DESCRIPTION

[0034] Hereinafter, exemplary embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. Figure 2 The extending direction of the central axis A of the rotating electrical machine 100 shown in the figure is simply referred to as the "axial direction", and the radial direction and the circumferential direction centered on the central axis A of the rotating electrical machine 100 are simply referred to as the "radial direction" and the "circumferential direction". Figure 2 The axial direction when the rotating electrical machine 100 is arranged in the direction shown is defined as the up-down direction. In addition, in this specification, when viewed from above in the axial direction, the clockwise rotation side in the circumferential direction is defined as one side in the circumferential direction, and the counterclockwise rotation side in the circumferential direction is defined as the other side in the circumferential direction. In addition, the definitions of the up-down direction, the one side in the circumferential direction, and the other side are names used for explanation only, and do not limit the actual positional relationship and direction.

[0035] <1. Moving body, driving device and rotating motor>

[0036] Figure 1 3 is a schematic diagram showing the structure of a moving object 300 according to an embodiment of the present disclosure. In this embodiment, the moving object 300 is a car. However, the moving object 300 may also be a vehicle other than a car, a ship, an airplane, or a robot. Figure 1 As shown, the moving body 300 includes a driving device 200 and a moving operation unit 301 .

[0037] The moving action part 301 is connected to the driving device 200 and can move the moving body 300. Specifically, the moving action part 301 is a wheel fixed to the axle 302. The axle 302 may be, for example, a structure connected to the driving device 200 or a structure included in the driving device 200. The moving action part 301 is driven by the driving device 200 to rotate around the axle 302. The moving body 300 moves as the moving action part 301 rotates.

[0038] In addition, the driving device 200 may be disposed at any part of the moving body 300 as long as it can be directly or indirectly connected to the moving operation unit 301. The driving device 200 may be a device constituting a so-called in-wheel motor.

[0039] Figure 2 Schematically shows the structure of the driving device 200 according to the embodiment of the present disclosure. Figure 2 As shown, the driving device 200 includes a rotating electrical machine 100 and a gear unit 201 connected to the rotating electrical machine 100 .

[0040] In the present embodiment, the rotating electrical machine 100 is a motor. The drive device 200 has an inverter (not shown) that supplies power to the rotating electrical machine 100. However, the technology disclosed in the present invention can also be applied to a structure in which the rotating electrical machine is used as a generator. The rotating electrical machine 100 has a rotor 10 and a stator 20 arranged radially outside the rotor 10. That is, the rotating electrical machine 100 of the present embodiment is an inner rotor type rotating electrical machine.

[0041] The rotor 10 rotates about the central axis A. The rotor 10 is cylindrical about the central axis A. The rotor 10 has an excitation magnet embedded therein, which will be described in detail below. That is, the rotary electric machine 100 is an IPM (Interior Permanent Magnet) type rotary electric machine.

[0042] The stator 20 is an armature of the rotating electric machine 100. The stator 20 is cylindrical with the central axis A as the center. The stator 20 is opposite to the rotor 10 arranged radially inside 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 211 extending in the axial direction; and a plurality of teeth 212 extending radially inside from the core back 211. The coil 22 is formed by winding a conductive wire on the teeth 212 of the stator core 21 via an insulator not shown in the figure. When a driving current is supplied to the coil 22, a radial magnetic flux is generated on the teeth 212 of the stator core 21. As a result, a circumferential torque is generated on the rotor 10, and the rotor 10 rotates around the central axis A.

[0043] The rotating electric machine 100 further includes a columnar shaft 40 extending in the axial direction. The shaft 40 is arranged radially inside the rotor 10 and fixed to the rotor 10. The shaft 40 rotates around the central axis A together with the rotor 10. In the present embodiment, the upper end of the shaft 40 is inserted into the housing 2011 of the gear unit 201. The gear unit 201 includes a plurality of gears 2012 in its housing 2011. When the shaft 40 rotates, the rotational force of the shaft 40 is transmitted to the axle 302 through the plurality of gears 2012.

[0044] In the present embodiment, the rotating electrical machine 100 is connected to the moving operation section 301 via the gear unit 201 , but may be directly connected to the moving operation section 301 .

[0045] As described below, according to the present disclosure, the rotor 10 having a skew structure can be manufactured at low cost while reducing torque ripple. Therefore, the rotating electrical machine 100, the drive device 200, and the moving body 300 having the rotor 10 can be manufactured at low cost while improving characteristics.

[0046] <2. Rotor>

[0047] Next, the rotor 10 will be described in detail.

[0048] (2-1. First embodiment)

[0049] Figure 3 1 is a side view schematically showing the structure of the rotor 10 according to the first embodiment of the present disclosure. Figure 3 As shown in the figure, the rotor 10 has a first rotor core 11 and a second rotor core 12 arranged in the axial direction. In the present embodiment, the first rotor core 11 is set at the top, and the second rotor core 12 is set at the bottom, and the first rotor core 11 and the second rotor core 12 are arranged up and down. In addition, in the present embodiment, the number of rotor cores constituting the rotor 10 is two. However, the number of rotor cores constituting the rotor 10 may be any number greater than two.

[0050] The first rotor core 11 and the second rotor core 12 are both cylindrical with the central axis A as the center. The first rotor core 11 and the second rotor core 12 have the same inner diameter and outer diameter. In addition, the axial lengths of the first rotor core 11 and the second rotor core 12 are also the same. The first rotor core 11 and the second rotor core 12 are, for example, laminated steel plates in which a plurality of electromagnetic steel plates are laminated in the axial direction. The plurality of electromagnetic steel plates are fixed to each other, for example, by riveting or welding.

[0051] The first rotor core 11 and the second rotor core 12 have a plurality of magnetic poles in the circumferential direction. The first rotor core 11 and the second rotor core 12 have the same number of magnetic poles. Figure 3 In FIG. 1 , the thick line TL shows the circumferential center position of each magnetic pole. Figure 3 As shown, the first rotor core 11 and the second rotor core 12 are configured so that the positions of the magnetic poles are offset from each other in the circumferential direction. That is, the rotor 10 has a skewed structure. In this way, by configuring the rotor 10 to have a skewed structure, it is possible to reduce the cogging torque. In the present embodiment, the first rotor core 11 is configured to be offset to one side in the circumferential direction relative to the second rotor core 12. However, the first rotor core 11 may also be configured to be offset to the other side in the circumferential direction relative to the second rotor core 12. The angle by which the first rotor core 11 and the second rotor core 12 are offset in the circumferential direction may be an arbitrary value obtained, for example, by experiments or simulations.

[0052] Figure 4 1 is a top view showing a schematic structure of the first rotor core 11 included in the rotor 10 of the first embodiment. In the present embodiment, the second rotor core 12 has the same structure as the first rotor core 11 except that the positions of the magnetic poles are arranged circumferentially staggered. Therefore, the structure of the first rotor core 11 may be referred to. Figure 4, the structure of the second rotor core 12 is also described. In this embodiment, the first rotor core 11 and the second rotor core 12 can be manufactured using the same mold, so the manufacturing cost can be suppressed compared to the case where the first rotor core and the second rotor core are manufactured using different molds.

[0053] like Figure 4 As shown, the first rotor core 11 and the second rotor core 12 have a pair of first magnets 13a, 13b and a pair of first magnet receiving holes 14a, 14b, respectively.

[0054] In the present embodiment, in each of the first rotor core 11 and the second rotor core 12, eight first magnets 13a and 13b are arranged at equal intervals in the circumferential direction. The pair of first magnets 13a and 13b constitutes a magnetic pole. That is, the first rotor core 11 and the second rotor core 12 each have eight magnetic poles. However, the number of magnetic poles may be other than eight, and the number of magnetic poles may be changed, for example, according to the target design of the rotating electrical machine 100.

[0055] A pair of first magnets 13a, 13b are arranged in a V-shape with the circumferential spacing becoming wider as they go radially outward. In detail, the pair of first magnets 13a, 13b are respectively rectangular parallelepiped shapes when viewed from the axial direction. When viewed from the axial direction, the length directions of the pair of first magnets 13a, 13b are inclined in opposite directions relative to the radial direction. The pair of first magnets 13a, 13b have the same shape and size, and when viewed from the axial direction, they are symmetrically arranged with reference to an imaginary line extending radially from the center axis A. The pair of first magnets 13a, 13b are permanent magnets having the same magnetic properties as each other, such as sintered magnets or bonded magnets.

[0056] A pair of first magnet receiving holes 14a, 14b receives a pair of first magnets 13a, 13b. Therefore, in the present embodiment, in each of the first rotor core 11 and the second rotor core 12, the number of the pair of first magnet receiving holes 14a, 14b is eight. The number of the pair of first magnet receiving holes 14a, 14b can be changed according to the number of the pair of first magnets 13a, 13b. A plurality of pairs of first magnet receiving holes 14a, 14b are arranged at equal intervals in the circumferential direction.

[0057] The pair of first magnet receiving holes 14a, 14b are similar to the pair of first magnets 13a, 13b, and are V-shaped with the circumferential spacing becoming wider as they go radially outward. The pair of first magnet receiving holes 14a, 14b are symmetrically arranged with reference to an imaginary line extending radially from the center axis A when viewed from above from the axial direction. The pair of first magnet receiving holes 14a, 14b are through holes that axially penetrate the rotor cores 11, 12 provided with the receiving holes 14a, 14b.

[0058] In this embodiment, the pair of first magnet receiving holes 14a and 14b have first gaps 15 at both ends in the longitudinal direction of the first magnets 13a and 13b received in the receiving holes 14a and 14b when viewed from the axial direction. The first gaps 15 function as flux barriers.

[0059] Figure 5 It is schematically shown Figure 4 FIG. 1 is a top view showing a detailed structure of the first rotor core 11 . Figure 5 FIG. 1 is an enlarged view showing a portion of the first rotor core 11. Figure 5 As shown, the first rotor core 11 further has a plurality of magnetic flux blocking portions 30 penetrating in the axial direction. The magnetic flux blocking portions 30 are through holes provided separately from the first magnet receiving holes 14. Specifically, the plurality of magnetic flux blocking portions 30 include a first magnetic flux blocking portion 31 and a second magnetic flux blocking portion 32.

[0060] In the present embodiment, among the plurality of magnetic flux blocking portions 30, only two types of magnetic flux blocking portions, namely, the first magnetic flux blocking portion 31 and the second magnetic flux blocking portion 32, are included. In the present embodiment, the shapes and sizes of the first magnetic flux blocking portion 31 and the second magnetic flux blocking portion 32 are different from each other. However, the first magnetic flux blocking portion 31 and the second magnetic flux blocking portion 32 may have the same shape and size. The shape of the magnetic flux blocking portion 30 is not particularly limited.

[0061] Figure 6 It is shown Figure 5 FIG. 1 is a diagram showing the relationship between the first rotor core 11 and the second rotor core 12 arranged below the first rotor core 11. Figure 6 In FIG. 1 , the structure related to the second rotor core 12 is shown by dotted lines. Figure 6 As shown, the first magnetic flux blocking portion 31 and the second magnetic flux blocking portion 32 at least partially overlap with the first magnet receiving hole 14 of the second rotor core 12 in the axial direction.

[0062] Specifically, at least a portion of the first magnetic flux blocking portion 31 in the axial direction overlaps with the first magnet receiving hole 14a on one circumferential side of the pair of first magnet receiving holes 14a, 14b of the second rotor core 12. At least a portion of the second magnetic flux blocking portion 32 in the axial direction overlaps with the first magnet receiving hole 14b on the other circumferential side of the pair of first magnet receiving holes 14a, 14b of the second rotor core 12.

[0063] exist Figure 6 In FIG. 1 , black dots indicate injection positions of the resin 16 . Figure 71 is a top view schematically showing the structure of a portion of the first rotor core 11 after the resin 16 is injected. In the present embodiment, the resin 16 is similarly injected into each magnetic pole of the rotor 10 formed by overlapping the first rotor core 11 and the second rotor core 12. In each magnetic pole of the first rotor core 11, the resin 16 is injected into each of a pair of first magnet receiving holes 14a, 14b, the first magnetic flux blocking portion 31, and the second magnetic flux blocking portion 32. The first magnetic flux blocking portion 31 and the second magnetic flux blocking portion 32 at least partially overlap with the first magnet receiving hole 14 of the second rotor core 12 in the axial direction. Therefore, by injecting the resin 16 from the first rotor core 11 side, the resin 16 can be filled not only into the first magnet receiving hole 14 of the first rotor core 11, but also into the first magnet receiving hole 14 of the second rotor core 12.

[0064] That is, the rotor 10 of this embodiment further includes the resin 16 filled in the first magnet receiving hole 14 and the magnetic flux barrier 30. Specifically, the rotor 10 includes the resin 16 filled in the first magnet receiving hole 14, the first magnetic flux barrier 31, and the second magnetic flux barrier 32. The resin 16 is, for example, epoxy resin.

[0065] By adopting this structure, in each rotor core 11, 12 constituting the rotor 10, the first magnet 13 can be fixed in the first magnet receiving hole 14 using the resin 16. In addition, since the first rotor core 11 and the second rotor core 12 are overlapped in the axial direction, the first magnet 13 can be fixed in each rotor core 11, 12 using the resin 16 in a concentrated manner, so that the working efficiency when manufacturing the rotor 10 can be improved.

[0066] Preferably, as much as possible of the first magnetic flux barrier 31 and the second magnetic flux barrier 32 overlap with the first magnet receiving hole 14. Thus, the filling efficiency of the resin 16 can be improved. In addition, in detail, the resin 16 is melted during injection, and the molten resin 16 solidifies in the first magnet receiving hole 14, so that the first magnet 13 is fixed to the rotor cores 11 and 12. In addition, the resin 16 may also cover the end surface on the upper side of the first magnet 13 in the first magnet receiving hole 14. In the second rotor core 12, the end on the lower side of the first magnet 13 received in the first magnet receiving hole 14 of the second rotor core 12 may not be covered by the resin 16. On the lower side of the second rotor core 12, the end on the lower side of the first magnet 13 may also be arranged on the same plane as the opening edge of the first magnet receiving hole 14 of the second rotor core 12.

[0067] like Figure 5As shown, when viewed from above from the axial direction, an imaginary line connecting the circumferential middle position of a pair of first magnets 13a, 13b and the central axis A is set as the first axis J1. In addition, an imaginary line adjacent to the first axis J1 in the circumferential direction, magnetically orthogonal to the first axis J1 and passing through the central axis A when viewed from above from the axial direction is set as the second axis J2. In other words, the second axis J2 is an imaginary line connecting the circumferential middle position of the circumferentially adjacent first axis J1 and the central axis A. In addition, the first axis J1 is the so-called d-axis. The second axis J2 is the so-called q-axis.

[0068] like Figure 5 As shown, the first magnetic flux blocking portion 31 is arranged between the first axis J1 and the circumference of the first magnet 13. In other words, the first magnetic flux blocking portion 31 is arranged between the first axis J1 and the circumference of the first magnet receiving hole 14. In the present embodiment, the first magnetic flux blocking portion 31 is arranged between the first axis J1 and the first magnet 13a on one side of the pair of first magnets 13a, 13b in the circumferential direction.

[0069] However, when the direction in which the second rotor core 12 is offset in the circumferential direction relative to the first rotor core 11 is set to the opposite direction to that in the present embodiment, the first magnetic flux blocking portion 31 may be arranged between the first axis J1 and the first magnet 13b on the other side of the pair of first magnets 13a and 13b in the circumferential direction. In addition, other magnetic flux blocking portions may be provided at positions symmetrical to the first magnetic flux blocking portion 31 with respect to the first axis J1 of the first rotor core 11. By configuring in this way, the balance deviation of the first rotor core 11 can be suppressed, and the rotor 10 can be stably rotated.

[0070] In addition, if Figure 5 As shown, the second magnetic flux barrier 32 is arranged on the second axis J2. In this way, by arranging the first magnetic flux barrier 31 and the second magnetic flux barrier 32 in consideration of the positional relationship between the first axis J1 and the second axis J2, a plurality of magnetic flux barriers 30 can be arranged at positions where torque ripple can be reduced. That is, in the rotor 10 having a skewed structure, torque ripple can be reduced and manufacturing efficiency can be improved.

[0071] Figure 8 It is a diagram for explaining the details of the arrangement of the first magnetic flux barrier portion 31 and the second magnetic flux barrier portion 32 . Figure 8 is with Figure 5 The same is an enlarged top view of the first rotor core 11. Figure 8 As shown, when viewed from above from the axial direction, the imaginary circle with a radius from the central axis A to the radially outermost end of the first magnet receiving hole 14 is set as the first imaginary circle VC1, and the imaginary circle with a radius from the central axis A to the radially outermost end of the first magnet 13 is set as the second imaginary circle VC2. Figure 8As shown, the second magnetic flux barrier 32 is disposed between the first imaginary circle VC1 and the second imaginary circle VC2 in the radial direction.

[0072] In addition, if Figure 6 As shown, the first flux blocking portion 31 and the second flux blocking portion 32 are arranged at symmetrical positions with respect to the first axis J1 of the second rotor core 12. That is, the first flux blocking portion 31 is also arranged between the radial directions of the first imaginary circle VC1 and the second imaginary circle VC2.

[0073] When the first magnetic flux blocking portion 31 and the second magnetic flux blocking portion 32 are arranged in this way, in a structure in which the second rotor core 12 is arranged so that the position of the magnetic pole is offset in the circumferential direction relative to the first rotor core 11, the first magnetic flux blocking portion 31 and the second magnetic flux blocking portion 32 provided on the first rotor core 11 can be used to efficiently fill the first magnet receiving holes 14 of the second rotor core 12 with the resin 16. In addition, the first magnetic flux blocking portion 31 and the second magnetic flux blocking portion 32, which can efficiently inject the resin 16 into each of the first magnet receiving holes 14 of the plurality of rotor cores 11 and 12, can be arranged at a position suitable for reducing torque ripple.

[0074] Fig. 9 is a graph showing experimental results for explaining the configuration of the second magnetic flux barrier portion 32. Fig. 9 , the horizontal axis X1 shows the distance between the second magnetic flux blocking portion 32 arranged on the second axis J2 and the outer peripheral surface of the first rotor core 11. The distance is shown as a percentage relative to the radius of the first rotor core 11. In addition, the vertical axis Y1 is the torque fluctuation. In particular, the vertical axis Y1 shows the value after the torque fluctuation value obtained when the second magnetic flux blocking portion 32 is not arranged is set to 1 and standardized. In addition, as for the experimental conditions when the second magnetic flux blocking portion 32 used for standardization is not arranged, except that the second magnetic flux blocking portion 32 is not arranged, the same as the obtained Fig. 9 The experimental conditions were the same when the experimental data were shown.

[0075] like Fig. 9 As shown in FIG. 1 , when the second magnetic flux blocking portion 32 is disposed at a distance of 2.9% of the radius of the first rotor core 11 from the outer circumferential surface of the first rotor core 11, the torque ripple is almost unchanged compared to the case where the second magnetic flux blocking portion 32 is not disposed. If the second magnetic flux blocking portion 32 is disposed at a distance greater than 2.9% of the radius of the first rotor core 11 from the outer circumferential surface of the first rotor core 11, it can be estimated that the torque ripple is reduced.

[0076] according to Fig. 9As a result, the second magnetic flux blocking portion 32 is preferably arranged at a distance of 3.5% or more of the radius of the first rotor core 11 from the outer peripheral surface of the first rotor core 11. Thus, the magnetic flux blocking portion 30 that can efficiently inject the resin 16 into each of the first magnet receiving holes 14 of the plurality of rotor cores 11 and 12 can be arranged at an appropriate position, which can reduce torque ripple.

[0077] In addition, the plurality of flux barriers 30 are preferably arranged on the same circumference centered on the central axis A. According to such a structure, since the plurality of flux barriers 30 are provided at the same radial distance from the central axis A, the rotor 10 can be prevented from being unbalanced and can be stably rotated.

[0078] (2-2. Second Embodiment)

[0079] Next, a rotor 10A according to a second embodiment will be described. When describing the rotor 10A according to the second embodiment, the description of the same configuration and content as those of the first embodiment will be omitted unless it is particularly necessary to explain them.

[0080] The rotor 10A of the present embodiment also includes a first rotor core 11A and a second rotor core 12A similarly to the first embodiment, and the first rotor core 11A and the second rotor core 12A have a skew structure. Fig.10 It is a plan view showing the structure of a first rotor core 11A included in a rotor 10A according to the second embodiment. Fig.10 This is an enlarged view showing a part of the first rotor core 11A. Fig.11 It is shown Fig.10 FIG. 1 is a diagram showing the relationship between the first rotor core 11A and the second rotor core 12A disposed below the first rotor core 11A. Fig.11 In FIG. 1 , the structure related to the second rotor core 12A is shown by dotted lines.

[0081] like Fig.10 and Fig.11 As shown, in this embodiment, the first rotor core 11A and the second rotor core 12A also have a pair of first magnets 13aA, 13bA and a pair of first magnet receiving holes 14aA, 14bA, respectively. However, in this embodiment, the first rotor core 11A and the second rotor core 12A also have a pair of second magnets 17a, 17b and a pair of second magnet receiving holes 18a, 18b, respectively. This is different from the first embodiment.

[0082] A pair of second magnets 17a, 17b are arranged in a V-shape radially outside and circumferentially between a pair of first magnets 13aA, 13bA. In detail, the V-shape is a V-shape in which the circumferential spacing becomes wider as it moves radially outward. The pair of second magnets 17a, 17b are respectively rectangular parallelepiped shapes when viewed from the axial direction. When viewed from the axial direction, the length directions of the pair of second magnets 17a, 17b are inclined in opposite directions relative to the radial direction. The pair of second magnets 17a, 17b have the same shape and size, and are symmetrically arranged with respect to the first axis J1 of the first rotor core 11A when viewed from the axial direction.

[0083] The pair of second magnets 17a, 17b are permanent magnets having the same magnetic properties as each other, such as sintered magnets or bonded magnets. The pair of second magnets 17a, 17b together with the pair of first magnets 13aA, 13bA constitute magnetic poles. In each of the first rotor core 11A and the second rotor core 12A, the number of magnetic poles constituted by the pair of first magnets 13aA, 13bA and the pair of second magnets 17a, 17b is eight.

[0084] The pair of second magnet receiving holes 18a, 18b receives a pair of second magnets 17a, 17b. Therefore, in the present embodiment, the number of the pair of second magnet receiving holes 18a, 18b in each of the first rotor core 11A and the second rotor core 12A is also eight. The plurality of pairs of second magnet receiving holes 18a, 18b are arranged at equal intervals in the circumferential direction.

[0085] The pair of second magnet receiving holes 18a, 18b are V-shaped in the same manner as the pair of second magnets 17a, 17b, with the circumferential spacing becoming wider as it moves radially outward. The pair of second magnet receiving holes 18a, 18b are symmetrically arranged with respect to the first axis J1 of the first rotor core 11A when viewed from above from the axial direction. The pair of second magnet receiving holes 18a, 18b are through holes that penetrate the rotor cores 11A, 12A in the axial direction in which the receiving holes 18a, 18b are provided.

[0086] In this embodiment, the pair of second magnet receiving holes 18a and 18b have second gaps 19 at both ends in the longitudinal direction of the second magnets 17a and 17b received in the receiving holes 18a and 18b when viewed from the axial direction. The second gaps 19 function as magnetic flux barriers.

[0087] In the present embodiment, the first rotor core 11A also has a plurality of magnetic flux blocking portions 30A as in the first embodiment. The magnetic flux blocking portion 30A is a through hole provided separately from the first magnet receiving hole 14 and the second magnet receiving hole 18. The plurality of magnetic flux blocking portions 30A include a first magnetic flux blocking portion 31A and a second magnetic flux blocking portion 32A. However, in the present embodiment, the plurality of magnetic flux blocking portions 30A also have a third magnetic flux blocking portion 33 and a fourth magnetic flux blocking portion 34. This is different from the first embodiment. The shapes and sizes of the third magnetic flux blocking portion 33 and the fourth magnetic flux blocking portion 34 are not particularly limited.

[0088] like Fig.11 As shown, in this embodiment, as in the first embodiment, at least a portion of the first magnetic flux blocking portion 31A and the second magnetic flux blocking portion 32A overlap with the first magnet receiving hole 14A of the second rotor core 12A in the axial direction. Specifically, at least a portion of the first magnetic flux blocking portion 31A overlaps with the first magnet receiving hole 14aA on one side in the circumferential direction of the pair of first magnet receiving holes 14aA and 14bA of the second rotor core 12A in the axial direction. At least a portion of the second magnetic flux blocking portion 32A overlaps with the first magnet receiving hole 14bA on the other side in the circumferential direction of the pair of first magnet receiving holes 14aA and 14bA of the second rotor core 12A in the axial direction.

[0089] Moreover, in the present embodiment, at least a portion of the third magnetic flux blocking portion 33 and the fourth magnetic flux blocking portion 34 overlaps with the second magnet receiving hole 18 of the second rotor core 12A in the axial direction. Specifically, at least a portion of the third magnetic flux blocking portion 33 overlaps with the second magnet receiving hole 18b on the other circumferential side of the pair of second magnet receiving holes 18a, 18b of the second rotor core 12 in the axial direction. At least a portion of the fourth magnetic flux blocking portion 34 overlaps with the second magnet receiving hole 18a on one circumferential side of the pair of second magnet receiving holes 18a, 18b of the second rotor core 12 in the axial direction.

[0090] exist Fig.11 In FIG. 1 , black dots indicate injection positions of the resin 16A. Fig.121 is a top view schematically showing the structure of a portion of the first rotor core 11A after the resin 16A is injected. In the present embodiment, the resin 16 is injected similarly in each magnetic pole of the rotor 10A formed by overlapping the first rotor core 11A and the second rotor core 12A. In each magnetic pole of the first rotor core 11A, the resin 16A is injected into each of the pair of first magnet receiving holes 14aA and 14bA, each of the pair of second magnet receiving holes 18a and 18b, the first magnetic flux blocking portion 31A, the second magnetic flux blocking portion 32A, the third magnetic flux blocking portion 33, and the fourth magnetic flux blocking portion 34. The first magnetic flux blocking portion 31A and the second magnetic flux blocking portion 32A at least partially overlap with the first magnet receiving hole 14A of the second rotor core 12A in the axial direction, and the third magnetic flux blocking portion 33 and the fourth magnetic flux blocking portion 34 at least partially overlap with the second magnet receiving hole 18 of the second rotor core 12A in the axial direction. Therefore, by injecting resin 16A from the first rotor core 11A side, not only the first magnet receiving holes 14A and the second magnet receiving holes 18 of the first rotor core 11A but also the first magnet receiving holes 14A and the second magnet receiving holes 18 of the second rotor core 12A can be filled with resin 16A.

[0091] That is, the rotor 10A of the present embodiment further includes the resin 16A filled in the first magnet receiving hole 14A, the second magnet receiving hole 18, and the magnetic flux blocking portion 30A. Specifically, the rotor 10A includes the resin 16A filled in the first magnet receiving hole 14A, the second magnet receiving hole 18, the first magnetic flux blocking portion 31A, the second magnetic flux blocking portion 32A, the third magnetic flux blocking portion 33, and the fourth magnetic flux blocking portion 34. The resin 16A is, for example, epoxy resin or the like.

[0092] With such a structure, in each rotor core 11A, 12A constituting the rotor 10A, the first magnet 13A can be fixed in the first magnet receiving hole 14A using the resin 16A, and the second magnet 17 can be fixed in the second magnet receiving hole 18. Furthermore, since the first rotor core 11A and the second rotor core 12A can be overlapped in the axial direction, the first magnet 13A and the second magnet 17 can be fixed in each rotor core 11A, 12A using the resin 16A in a centralized manner, so that the working efficiency when manufacturing the rotor 10A can be improved. In addition, the resin 16A can also cover the upper end face of the first magnet 13A in the first magnet receiving hole 14A. In the second rotor core 12A, the lower end of the first magnet 13A received in the first magnet receiving hole 14A of the second rotor core 12A may not be covered by the resin 16A. On the lower side of the second rotor core 12A, the end of the lower side of the first magnet 13A may also be arranged on the same plane as the opening edge of the lower side of the first magnet receiving hole 14A of the second rotor core 12A. The resin 16A may also cover the end surface of the upper side of the second magnet 17 in the second magnet receiving hole 18. The end of the lower side of the second magnet 17 received in the second magnet receiving hole 18 of the second rotor core 12A may not be covered by the resin 16A. On the lower side of the second rotor core 12A, the end of the lower side of the second magnet 17 may also be located on the same plane as the opening edge of the lower side of the second magnet receiving hole 18 of the second rotor core 12A.

[0093] like Fig.10 As shown, the first magnetic flux barrier 31A is arranged between the first magnet 13aA on one side of the pair of first magnets 13aA and 13bA and the second magnet 17a on one side of the pair of second magnets 17a and 17b. In other words, the first magnetic flux barrier 31A is arranged between the first magnet receiving hole 14aA on one side of the pair of first magnet receiving holes 14aA and 14bA and the second magnet receiving hole 18a on one side of the pair of second magnet receiving holes 18a and 18b.

[0094] In addition, the second magnetic flux blocking portion 32A is arranged on the second axis J2 in the same manner as in the first embodiment. In addition, the first magnetic flux blocking portion 31A and the second magnetic flux blocking portion 32A are arranged at positions symmetrical to the first axis J1 of the second rotor core 12A in the same manner as in the first embodiment. In addition, the first magnetic flux blocking portion 31A and the second magnetic flux blocking portion 32A are arranged between the circumferential directions of the first virtual circle VC1 and the second virtual circle VC2 in the same manner as in the first embodiment.

[0095] The third magnetic flux blocking portion 33 is disposed circumferentially between the first magnet 13bA on the other circumferential side of the pair of first magnets 13aA, 13bA and the second magnet 17b on the other circumferential side of the pair of second magnets 17a, 17b. In other words, the third magnetic flux blocking portion 33 is disposed circumferentially between the first magnet receiving hole 14bA on the other circumferential side of the pair of first magnet receiving holes 14aA, 14bA and the second magnet receiving hole 18b on the other circumferential side of the pair of second magnet receiving holes 18a, 18b.

[0096] The fourth magnetic flux blocking portion 34 is disposed between the first axis J1 of the first rotor core 11A and the second magnet 17a on one circumferential side of the pair of second magnets 17a, 17b. In other words, the fourth magnetic flux blocking portion 34 is disposed between the first axis J1 of the first rotor core 11A and the second magnet receiving hole 18a on one circumferential side of the pair of second magnet receiving holes 18a, 18b.

[0097] In this way, by configuring the first flux blocking portion 31A, the second flux blocking portion 32A, the third flux blocking portion 33, and the fourth flux blocking portion in consideration of the positional relationship between the first axis J1 and the second axis J2 and the positional relationship between the first magnet 13A and the second magnet 17, it is possible to configure a plurality of flux blocking portions 30A at positions where torque ripple can be reduced. That is, in the rotor 10A having a skewed structure, it is possible to achieve reduction in torque ripple and improvement in manufacturing efficiency. In addition, in the case where the direction in which the second rotor core 12A is offset relative to the first rotor core 11A in the circumferential direction is opposite to that of the present embodiment, the circumferential positional relationship in which the various flux blocking portions are provided can be configured by appropriately switching one side and the other side in the circumferential direction in the opposite direction to the above description.

[0098] Fig.13 It is a diagram for explaining the details of the arrangement of the plurality of magnetic flux barrier portions 30A included in the first rotor core 11A according to the second embodiment. Fig.13 is with Fig.10 The same is an enlarged top view of the first rotor core 11A. Fig.13 As shown, when viewed from above axially, the imaginary circle with a radius from the center axis A to the radial outermost end of the second magnet receiving hole 18 is set as the third imaginary circle VC3, and the imaginary circle with a radius from the center axis A to the radial outermost end of the second magnet 17 is set as the fourth imaginary circle VC4.

[0099] In this case, at least one of the third magnetic flux barrier 33 and the fourth magnetic flux barrier 34 is preferably arranged between the radial directions of the third imaginary circle VC3 and the fourth imaginary circle VC4. According to this structure, the third magnetic flux barrier 33 and the fourth magnetic flux barrier 34, which can efficiently inject the resin 16A into each second magnet receiving hole 18 of the plurality of rotor cores 11A and 12A, are arranged at appropriate positions, thereby reducing torque ripple. In this embodiment, as a more preferred mode, both the third magnetic flux barrier 33 and the fourth magnetic flux barrier 34 are arranged between the radial directions of the third imaginary circle VC3 and the fourth imaginary circle VC4.

[0100] In addition, if Fig.11 As shown, in the present embodiment, the third magnetic flux blocking portion 33 and the fourth magnetic flux blocking portion 34 are arranged at positions symmetrical with respect to the first axis J1 of the second rotor core 12A. When the third magnetic flux blocking portion 33 and the fourth magnetic flux blocking portion 34 are arranged in this way, in a structure in which the second rotor core 12A is arranged so that the positions of the magnetic poles are shifted in the circumferential direction relative to the first rotor core 11A, the resin 16A can be efficiently filled into the second magnet receiving holes 18 of the second rotor core 12 using the third magnetic flux blocking portion 33 and the fourth magnetic flux blocking portion 34 provided on the first rotor core 11A. In addition, the third magnetic flux blocking portion 33 and the fourth magnetic flux blocking portion 34, which can efficiently inject the resin 16A into each of the second magnet receiving holes 18 of the plurality of rotor cores 11A and 12A, can be arranged at a position suitable for reducing torque ripple.

[0101] Fig.14 is a graph showing experimental results for explaining the configuration of the third magnetic flux barrier portion 33. Fig.14 In the figure, the horizontal axis X2 shows the distance between the third magnetic flux barrier 33 and the outer peripheral surface of the first rotor core 11A. The distance is shown as a percentage relative to the radius of the first rotor core 11A. In addition, the vertical axis Y2 is the torque fluctuation. In particular, the vertical axis Y2 shows the value after the torque fluctuation value obtained when the third magnetic flux barrier 33 is not configured is set to 1 and standardized. In addition, as for the experimental conditions when the third magnetic flux barrier 33 is not configured for standardization, except that the third magnetic flux barrier 33 is not configured, the torque fluctuation value obtained is different from the value obtained. Fig.14 The experimental conditions for the experimental data shown are the same. In addition, when the third magnetic flux blocking portion 33 is arranged, the circumferential position of the third magnetic flux blocking portion 33 is the same.

[0102] like Fig.14As shown, the third magnetic flux blocking portion 33 has a tendency to reduce torque ripple as it approaches the outer circumferential surface of the first rotor core 11A. However, the closer the third magnetic flux blocking portion 33 is to the outer circumferential surface of the first rotor core 11A, the more difficult it is to manufacture the third magnetic flux blocking portion 33 to be arranged on the first rotor core 11A. Therefore, the third magnetic flux blocking portion 33 is preferably arranged at a position slightly offset radially inward from the outer circumferential surface of the first rotor core 11A. In addition, when the third magnetic flux blocking portion 33 is arranged at a distance of 7.3% of the radius of the first rotor core 11A from the outer circumferential surface of the first rotor core 11A, the torque ripple is almost unchanged compared to the case where the third magnetic flux blocking portion 33 is not arranged.

[0103] Therefore, the third flux blocking portion 33 is preferably disposed at a distance of 1.9% to 6.2% of the radius of the first rotor core 11A from the outer peripheral surface of the first rotor core 11A. Thus, the third flux blocking portion 33 can be disposed at an appropriate position to reduce torque ripple.

[0104] In addition, the first magnetic flux blocking portion 31A is arranged between the pair of first magnets 13aA, 13bA and the pair of second magnets 17a, 17b in the circumferential direction, similarly to the third magnetic flux blocking portion 33. Therefore, it is preferable that the distance between the first magnetic flux blocking portion 31A and the outer peripheral surface of the first rotor core 11A is the same as the distance between the third magnetic flux blocking portion 33 and the outer peripheral surface of the first rotor core 11A. In other words, it is preferable that the first magnetic flux blocking portion 31A is also arranged at a distance from the outer peripheral surface of the first rotor core 11A that is greater than 1.9% and less than 6.2% of the radius of the first rotor core 11A. Thus, the first magnetic flux blocking portion 31A can be arranged at an appropriate position to reduce torque ripple.

[0105] In this embodiment, as a preferred mode, the first magnetic flux blocking portion 31A and the third magnetic flux blocking portion 33 are arranged at positions symmetrical to the first axis J1 of the first rotor core 11A when viewed from above from the axial direction. By adopting such a structure, the balance deviation of the first rotor core 11A can be suppressed, and the rotor 10A can be stably rotated.

[0106] Fig.15 is a first graph showing experimental results for explaining the configuration of the fourth magnetic flux barrier portion 34. Fig.15 In the figure, the horizontal axis X3 shows the angle of the fourth magnetic flux barrier 34 relative to the first axis J1 of the first rotor core 11A. In addition, the vertical axis Y3 is the torque fluctuation. The vertical axis Y3 shows the value after the torque fluctuation value obtained when the fourth magnetic flux barrier 34 is not configured is set to 1 and normalized. In addition, as for the experimental conditions when the fourth magnetic flux barrier 34 is not configured for standardization, except that the fourth magnetic flux barrier 34 is not configured, the torque fluctuation value obtained is different from the value obtained. Fig.15The experimental conditions for the experimental data shown are the same. In addition, when the fourth magnetic flux blocking portion 34 is arranged, the radial position of the fourth magnetic flux blocking portion 34 is the same.

[0107] like Fig.15 As shown in FIG. 1 , when the angle of the fourth magnetic flux blocking portion 34 relative to the first axis J1 is too small, the torque ripple tends to increase. When the angle of the fourth magnetic flux blocking portion 34 relative to the first axis J1 is less than 1.5°, the torque ripple may increase compared to the case where the fourth magnetic flux blocking portion 34 is not configured. In addition, if the angle of the fourth magnetic flux blocking portion 34 relative to the first axis J1 is too large, the torque ripple tends to increase. When the angle of the fourth magnetic flux blocking portion 34 relative to the first axis J1 is 5.5°, the torque ripple becomes higher than the case where the fourth magnetic flux blocking portion 34 is not configured.

[0108] Fig.16 is a second graph showing experimental results for explaining the configuration of the fourth magnetic flux barrier portion 34. Fig.16 , the horizontal axis X4 shows the distance between the fourth magnetic flux barrier 34 and the outer peripheral surface of the first rotor core 11A. The distance is shown as a percentage of the radius of the first rotor core 11A. In addition, the vertical axis Y4 is the torque fluctuation. In addition, the vertical axis Y4 shows the value after the torque fluctuation value obtained when the fourth magnetic flux barrier 34 is not configured is set to 1 and normalized. In addition, as for the experimental conditions when the fourth magnetic flux barrier 34 is not configured for standardization, except that the fourth magnetic flux barrier 34 is not configured, the torque fluctuation value obtained is different from the value obtained. Fig.16 The experimental conditions for the experimental data shown are the same. In addition, when the fourth magnetic flux blocking portion 34 is arranged, the circumferential position of the fourth magnetic flux blocking portion 34 is the same.

[0109] like Fig.16 As shown, the fourth magnetic flux blocking portion 34 has a tendency to reduce torque fluctuations as it approaches the outer peripheral surface of the first rotor core 11A. However, as with the third magnetic flux blocking portion 33, the closer the fourth magnetic flux blocking portion 34 is to the outer peripheral surface of the first rotor core 11A, the more difficult it is to manufacture it in the first rotor core 11A. Therefore, the fourth magnetic flux blocking portion 34 is preferably arranged at a position slightly offset radially inward from the outer peripheral surface of the first rotor core 11A. In addition, when the fourth magnetic flux blocking portion 34 is arranged at a distance exceeding 5.2% of the radius of the first rotor core 11A from the outer peripheral surface of the first rotor core 11A, the estimated torque fluctuation is almost unchanged compared to the case where the fourth magnetic flux blocking portion 34 is not arranged.

[0110] Therefore, it is preferred that the fourth magnetic flux blocking portion 34 is disposed within a range of 1.5° to 5° from the first axis J1 of the first rotor core 11A, and is disposed at a distance from the outer peripheral surface of the first rotor core 11A of 1.9% to 4.5% of the radius of the first rotor core 11A. Thus, the fourth magnetic flux blocking portion 34 can be disposed at an appropriate position to reduce torque ripple.

[0111] In addition, in the present embodiment, as a preferred mode, the plurality of magnetic flux blocking portions 30A further include a fifth magnetic flux blocking portion 35, which is arranged at a position symmetrical to the fourth magnetic flux blocking portion 34 with respect to the first axis J1 of the first rotor core 11A when viewed from above in the axial direction (for example, refer to Fig.10 By adopting such a structure, the balance deviation of the first rotor core 11A can be suppressed, and the rotor 10A can be stably rotated. In order to adjust the balance of the first rotor core 11A, Fig.12 As shown, the fifth magnetic flux barrier portion 35 is preferably also filled with the resin 16A.

[0112] In addition, the fifth magnetic flux blocking portion 35 may not be arranged at a position symmetrical to the fourth magnetic flux blocking portion 34. The fifth magnetic flux blocking portion 35 may be arranged on the side opposite to the side where the fourth magnetic flux blocking portion 34 is provided with respect to the first axis J1 of the first rotor core 11A, and arranged between the first axis J1 and the circumference of the second magnet 17. In this case, the fifth magnetic flux blocking portion 35 is preferably arranged within a range of 1.5° to 5° from the first axis J1 of the first rotor core 11A, and is arranged at a distance of 1.9% to 4.5% of the radius of the first rotor core 11A from the outer peripheral surface of the first rotor core 11A. Thus, the fifth magnetic flux blocking portion 35 can be arranged at an appropriate position to reduce torque ripple.

[0113] In addition, in the present embodiment, as in the case of the first embodiment, it is preferred that the plurality of magnetic flux blocking portions 30 are arranged on the same circumference centered on the central axis A. According to such a structure, since the plurality of magnetic flux blocking portions 30A are provided at the same radial distance from the central axis A, it is possible to suppress the balance of the rotor 10A from being disturbed, and the rotor 10A can be stably rotated.

[0114] Fig.17 It is a diagram for explaining a second rotor core 12A included in a rotor 10A according to the second embodiment. Fig.17 is shown in more detail Fig.11 FIG. 1 is a diagram showing the structure of the second rotor core 12A. Fig.17 As shown, the second rotor core 12A may also have a magnetic flux barrier 30A penetrating in the axial direction.

[0115] In the present embodiment, the second rotor core 12A has an unfilled flux barrier portion 36 that penetrates in the axial direction and is covered by the first rotor core 11A and is not filled with the resin 16A. By allowing such a structure, the second rotor core 12A can be made into a rotor core of the same shape as the first rotor core 11A. That is, the first rotor core 11A and the second rotor core 12A can be manufactured using the same mold, which can reduce the manufacturing cost. In the present embodiment, the second rotor core 12A has the same structure as the first rotor core 11A except for the structure in which the positions of the magnetic poles are staggered in the circumferential direction.

[0116] <3. Notes>

[0117] Various technical features disclosed in this specification can be modified in various ways without departing from the scope of the technical creation. In addition, multiple embodiments and modified examples shown in this specification can be combined and implemented within the possible scope.

[0118] The technology disclosed herein can be used in, for example, household appliances, automobiles, ships, airplanes, trains, electric-assisted bicycles, wind turbines, and the like.

[0119] (Explanation of symbols)

[0120] 10, 10A…Rotor

[0121] 11, 11A…First rotor core

[0122] 12, 12A…Second rotor core

[0123] 13, 13A…first magnet

[0124] 14, 14A…first magnet receiving hole

[0125] 16, 16A…resin

[0126] 17…Second magnet

[0127] 18…Second magnet receiving hole

[0128] 20…Stator

[0129] 30, 30A…Magnetic flux blocking part

[0130] 31, 31A... first magnetic flux blocking portion

[0131] 32, 32A... second magnetic flux blocking portion

[0132] 33 ... third magnetic flux barrier

[0133] 34 ... fourth magnetic flux barrier

[0134] 35 ... fifth magnetic flux barrier

[0135] 36…Unfilled flux barrier

[0136] 100…Rotary motor

[0137] 200…Driver

[0138] 201…Gear unit

[0139] 300…Mobile

[0140] 301…Mobile Action Department

[0141] A…Central axis

[0142] J1…First axis

[0143] J2…Second axis

[0144] VC1…First imaginary circle

[0145] VC2…Second imaginary circle

[0146] VC3…Third imaginary circle

[0147] VC4…the fourth imaginary circle.

Claims

1. A rotor that rotates about a central axis, wherein: The rotor includes a first rotor core and a second rotor core, wherein the first rotor core and the second rotor core are arranged along the axial direction and configured such that the positions of the magnetic poles are staggered from each other in the circumferential direction. The first rotor core and the second rotor core respectively have: a pair of first magnets, the pair of first magnets being arranged in a V-shape with a circumferential spacing increasing toward the radially outer side, and constituting the magnetic pole; and A pair of first magnet receiving holes, wherein the pair of first magnet receiving holes receive the pair of first magnets, The first rotor core also has a plurality of magnetic flux blocking portions penetrating along the axial direction. The plurality of magnetic flux blocking portions include a first magnetic flux blocking portion and a second magnetic flux blocking portion, wherein at least a portion of the first magnetic flux blocking portion and the second magnetic flux blocking portion overlaps with the first magnet receiving hole of the second rotor core in the axial direction. When looking down from the axial direction, An imaginary line connecting the circumferential middle position of the pair of first magnets and the central axis is set as a first axis, An imaginary line that is adjacent to the first axis in the circumferential direction, is magnetically orthogonal to the first axis, and passes through the central axis is set as a second axis, The first magnetic flux blocking portion is arranged between the first axis and the circumference of the first magnet. The second magnetic flux blocking portion is disposed on the second axis.

2. The rotor according to claim 1, wherein: When looking down from the axial direction, An imaginary circle having a radius from the central axis to the radially outermost end of the first magnet receiving hole is set as a first imaginary circle, An imaginary circle having a radius from the central axis to the radially outermost end of the first magnet is set as a second imaginary circle, The second magnetic flux blocking portion is arranged between the first imaginary circle and the second imaginary circle in radial directions. The first magnetic flux blocking portion and the second magnetic flux blocking portion are arranged at positions symmetrical with respect to the first axis of the second rotor core.

3. The rotor according to claim 1 or 2, wherein: The second magnetic flux blocking portion is disposed at a distance of 3.5% or more of a radius of the first rotor core from an outer peripheral surface of the first rotor core.

4. The rotor according to any one of claims 1 to 3, wherein: The first rotor core and the second rotor core each further include: a pair of second magnets, the pair of second magnets being arranged in the V-shape radially outside and circumferentially between the pair of first magnets and constituting the magnetic poles together with the pair of first magnets; and A pair of second magnet receiving holes, wherein the pair of second magnet receiving holes receive the pair of second magnets, The plurality of magnetic flux blocking portions further include a third magnetic flux blocking portion and a fourth magnetic flux blocking portion, wherein at least a portion of the third magnetic flux blocking portion and the fourth magnetic flux blocking portion overlap with the second magnet receiving hole of the second rotor core in the axial direction. The first magnetic flux blocking portion is arranged between the first magnet on one circumferential side of the pair of first magnets and the second magnet on one circumferential side of the pair of second magnets. The third magnetic flux barrier is disposed between the first magnet on the other side of the pair of first magnets and the second magnet on the other side of the pair of second magnets. The fourth magnetic flux blocking portion is disposed between the first axis of the first rotor core and the circumferential direction of the second magnet on one circumferential side of the pair of second magnets.

5. The rotor according to claim 4, wherein: When looking down from the axial direction, A virtual circle having a radius from the central axis to the radially outermost end of the second magnet receiving hole is set as a third virtual circle, An imaginary circle having a radius from the central axis to the radially outermost end of the second magnet is set as a fourth imaginary circle, At least one of the third magnetic flux blocking portion and the fourth magnetic flux blocking portion is arranged between the radial directions of the third imaginary circle and the fourth imaginary circle.

6. The rotor according to claim 4 or 5, wherein: The third magnetic flux barrier portion is disposed at a distance from the outer peripheral surface of the first rotor core that is not less than 1.9% and not more than 6.2% of the radius of the first rotor core.

7. A rotor according to any one of claims 4 to 6, wherein: The first magnetic flux blocking portion and the third magnetic flux blocking portion are arranged at positions symmetrical with respect to the first axis line of the first rotor core when viewed in plan from the axial direction.

8. A rotor according to any one of claims 4 to 7, wherein: The fourth magnetic flux barrier is arranged within a range of 1.5° to 5° from the first axis of the first rotor core and at a distance of 1.9% to 4.5% of the radius of the first rotor core from the outer peripheral surface of the first rotor core.

9. A rotor according to any one of claims 4 to 8, wherein: The third magnetic flux blocking portion and the fourth magnetic flux blocking portion are arranged at positions symmetrical with respect to the first axis of the second rotor core.

10. A rotor according to any one of claims 4 to 9, wherein: The plurality of magnetic flux blocking portions further include a fifth magnetic flux blocking portion disposed at a position symmetrical to the fourth magnetic flux blocking portion with respect to the first axis of the first rotor core when viewed in plan from the axial direction.

11. The rotor according to any one of claims 1 to 3, wherein: The invention further includes a resin filled in the first magnet receiving hole and the magnetic flux barrier portion.

12. A rotor according to any one of claims 4 to 10, wherein: The invention further includes a resin filled in the first magnet receiving hole, the second magnet receiving hole, and the magnetic flux barrier portion.

13. A rotor according to claim 11 or 12, wherein: The second rotor core includes an unfilled magnetic flux barrier portion that penetrates in the axial direction and is covered by the first rotor core without being filled with the resin.

14. A rotor according to any one of claims 1 to 13, wherein: The plurality of magnetic flux barriers are arranged on the same circumference centered on the central axis.

15. A rotating electrical machine comprising: The rotor according to any one of claims 1 to 14; and A stator is arranged radially outside the rotor.

16. A driving device comprising: The rotating electrical machine according to claim 15; and A gear unit is connected to the rotating electrical machine.

17. A mobile object, comprising: The driving device of claim 16; and The moving action part is connected to the driving device and can realize its own movement.

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