motor

Abstract

To provide a motor capable of attaining the increase of torque.SOLUTION: A motor 100 comprises a rotor 10. The rotor 10 includes a plurality of first magnets 11 and 12 and second magnets 21 and 22 disposed in a Halbach array in a circumferential direction of the rotor 10. The plurality of first magnets 11 and 12 and the second magnets 21 and 22 are adjacent to each other while being arrayed alternately. The second magnets 21 and 22 are longer in the circumferential direction of the rotor 10 in comparison with the first magnets 11 and 12. The first magnets 11 and 12 and the second magnets 21 and 22 are formed in a substantially trapezoidal shape in a view in a direction of a rotation axis X1 of the rotor 10.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to motors. [Background technology]

[0002] The motor disclosed in Patent Document 1 includes a rotor with four types of inclined magnets and two types of circumferential magnets arranged in a Halbach array. The four types of inclined magnets are magnetized in a direction inclined relative to the radial direction. The two types of circumferential magnets are magnetized in the circumferential direction. The circumferential width of each inclined magnet is set to half the circumferential width of the circumferential magnet. When the radial width of the inclined magnets and circumferential magnets is t, the magnetization direction of each inclined magnet is set so that the inclination angle θ relative to the radial direction satisfies θ≦11.5×ln(t)+1. Furthermore, the inclination angle θ is set so that θ={11.5×ln(t)-9}±2. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2007-159241 Summary of the Invention [Problem to be solved by the invention]

[0004] The inventors of the present application have discovered the following problems. There is a demand for motors that can generate large torque, and there is room for further consideration regarding torque in such motors.

[0005] The present disclosure has been made in consideration of the above-mentioned problems, and aims to provide a motor that can increase torque. [Means for solving the problem]

[0006] The motor according to the present disclosure comprises: A motor having a rotor, The rotor includes a plurality of first and second magnets arranged in a Halbach array in the circumferential direction of the rotor, the plurality of first and second magnets are arranged alternately and adjacent to each other; the second magnet is longer than the first magnet in the circumferential direction of the rotor; The first and second magnets have a substantially trapezoidal shape when viewed from the direction of the rotation axis of the rotor.

[0007] With this configuration, the first and second magnets have a generally trapezoidal shape, which makes it easier for magnetic flux to concentrate in a predetermined direction, thereby increasing torque.

[0008] Further, each of the adjacent first and second magnets has an upper base and a lower base that is longer than the upper base, The upper base of the first magnet and the lower base of the second magnet extend continuously in the circumferential direction, The lower base of the first magnet and the upper base of the second magnet extend continuously in the circumferential direction, The upper base of the first magnet and the lower base of the second magnet may be positioned radially inward of the rotor relative to the lower base of the first magnet and the upper base of the second magnet.

[0009] With this configuration, the upper and lower bases of adjacent first and second magnets extend in a continuous manner in the circumferential direction, which allows for further concentration of magnetic flux, thereby further increasing torque.

[0010] The first magnet includes first and second magnet pieces arranged in the circumferential direction of the rotor and adjacent to each other, The first and second magnet pieces may be magnetized in a direction inclined with respect to the circumferential direction of the rotor.

[0011] With this configuration, the adjacent first and second magnet pieces are magnetized in a predetermined direction, which makes it easier to concentrate the magnetic flux in the predetermined direction, thereby further increasing the torque.

[0012] The second magnet may be magnetized in a radial direction of the rotor. The second magnet includes third and fourth magnet pieces arranged in the circumferential direction of the rotor and adjacent to each other, The third and fourth magnet pieces may be magnetized in a direction inclined relative to the radial direction of the rotor.

[0013] With this configuration, the second magnet or the third and fourth magnet pieces are magnetized in a predetermined direction, which makes it easier to concentrate the magnetic flux in the predetermined direction, thereby further increasing the torque. [Effects of the Invention]

[0014] According to the present disclosure, it is possible to provide a motor that can increase torque. [Brief explanation of the drawings]

[0015] [Figure 1] 1 is a schematic cross-sectional view showing a configuration example of a motor according to a first embodiment. [Figure 2] 1 is a schematic cross-sectional view showing a specific example of a motor according to a first embodiment. [Figure 3] 1 is a schematic cross-sectional view showing a main part of a specific example of a motor according to a first embodiment. [Figure 4] FIG. 10 is a schematic cross-sectional view showing a configuration example of a motor according to a second embodiment. [Figure 5] FIG. 10 is a schematic cross-sectional view showing a specific example of a motor according to a second embodiment. [Figure 6] FIG. 10 is a schematic cross-sectional view showing a main part of a specific example of a motor according to a second embodiment. [Figure 7]10 is a graph showing calculated values ​​of torque versus rotation speed of each motor. [Figure 8] 1 is a schematic cross-sectional view showing an example of the configuration of a motor relating to a problem to be solved by the present disclosure; [Figure 9] 1 is a schematic cross-sectional view showing a specific example of a motor relating to a problem to be solved by the present disclosure; [Figure 10] 1 is a schematic cross-sectional view showing a main part of a specific example of a motor relating to a problem to be solved by the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0016] (Related Technology) Prior to describing specific embodiments to which the present disclosure is applied, a motor relating to the problem to be solved by the present disclosure will be described with reference to Figs. 8 to 10. Fig. 8 is a schematic cross-sectional view showing an example configuration of a motor relating to the problem to be solved by the present disclosure. Fig. 9 is a schematic cross-sectional view showing a specific example of the motor shown in Fig. 8. Fig. 10 is a schematic cross-sectional view showing a main part of the specific example of the motor shown in Fig. 9.

[0017] As shown in FIG. 8 , the motor 900 includes a rotor 910. The rotor 910 includes a plurality of magnets 911, 912, 921, and 922, and a rotor body 910a. The rotor body 910a is a cylindrical or annular body that is supported to be rotatable around a rotation axis X9. The rotor body 910a supports a plurality of magnets 911, 912, 921, and 922, which are arranged in a Halbach array in the circumferential direction of the rotor 910. Specifically, the magnets 911, 921, 912, and 922 are arranged in this order in the circumferential direction of the rotor 910. The magnet 911 is magnetized counterclockwise around the rotation axis X9, and the magnet 912 is magnetized clockwise around the rotation axis X9. The magnet 921 is magnetized on the radially outer side of the rotor 910, and the magnet 922 is magnetized on the radially inner side of the rotor 910.

[0018] A motor 900a shown in FIG. 9 is one specific example of the motor 900. The motor 900a includes a stator 930. The stator 930 includes a stator body 930a, a plurality of teeth 930b, and a winding 931. The stator body 930a is a cylindrical or annular body. The plurality of teeth 930b protrude radially outward from the outer periphery of the stator body 930a. The winding 931 is wound around the plurality of teeth 930b.

[0019] 10 , when viewed from the direction of rotation axis X9 of rotor 910, magnets 921 and 922 are longer in the circumferential direction of rotor 910 than magnets 911 and 912. As described above, the multiple magnets 911, 912, 921, and 922 are arranged in a Halbach array in the circumferential direction of rotor 910. Therefore, magnetic flux extends from the radially inner side of rotor 910 to magnet 921. Furthermore, magnetic flux extends from magnet 912 in the clockwise direction of rotor 910. Furthermore, magnetic flux extends from magnet 922 to the radially inner side of rotor 910. Furthermore, magnetic flux extends from magnet 911 in the counterclockwise direction of rotor 910. As a result, magnetic fields are concentrated from the multiple magnets 911, 921, 912, and 922 to the radially inner side of rotor 910.

[0020] When a current is supplied to winding 931 of stator 930, a magnetic field is generated, and the plurality of magnets 911, 921, 912, and 922 are given a force in the rotation direction of rotor 910. This causes rotor 910 to rotate, and motor 900a can generate torque via rotor 910.

[0021] Hereinafter, specific embodiments to which the present disclosure is applied will be described in detail with reference to the drawings. However, the present disclosure is not limited to the following embodiments. In addition, the following description and drawings have been simplified as appropriate for clarity of explanation.

[0022] (Embodiment 1) A first embodiment will be described with reference to Figures 1 to 3. Figure 1 is a schematic cross-sectional view showing an example of the configuration of a motor according to the first embodiment. Figure 2 is a schematic cross-sectional view showing a specific example of the motor shown in Figure 1. Figure 3 is a schematic cross-sectional view showing a main part of the specific example of the motor shown in Figure 2.

[0023] Naturally, the right-handed xyz coordinate system shown in Figure 1 and other drawings is for the convenience of explaining the positional relationships of the components. Normally, the positive z-axis direction is vertically upward, and the xy plane is the horizontal plane, which is common among the drawings.

[0024] As shown in FIG. 1, the motor 100 includes a rotor 10, which includes a plurality of first magnets 11 and 12, a plurality of second magnets 21 and 22, and a rotor body 10a.

[0025] The rotor body 10a is a cylindrical or annular body that is held rotatably around a rotation axis X1. The rotor body 10a holds first magnets 11, 12 and second magnets 21, 22. The example of the rotor body 10a shown in Fig. 1 holds three pairs of first magnets 11, 12 and second magnets 21, 22, but the number of pairs of first magnets 11, 12 and second magnets 21, 22 held by the rotor body 10a is not particularly limited and may be one pair or multiple pairs.

[0026] The first magnets 11, 12 and the second magnets 21, 22 are arranged in a Halbach array in the circumferential direction of the rotor 10. The first magnets 11, 12 and the second magnets 21, 22 are arranged alternately and adjacent to each other.

[0027] Specifically, the first magnet 11, the second magnet 21, the first magnet 12, and the second magnet 22 are arranged in this order in the circumferential direction of the rotor 10.

[0028] The first magnet 11 is magnetized in the counterclockwise direction around the rotation axis X1, and the first magnet 12 is magnetized in the clockwise direction around the rotation axis X1.

[0029] More specifically, the first magnet 11 is arranged in the circumferential direction of the rotor 10 and includes adjacent first magnet pieces 11a and second magnet pieces 11b. The first magnet pieces 11a and second magnet pieces 11b are magnetized in a direction inclined with respect to the circumferential direction of the rotor 10. Specifically, the first magnet piece 11a is magnetized in a counterclockwise direction about the rotation axis X1 and in a direction inclined radially inward of the rotor 10 with respect to the circumferential direction of the rotor 10. The second magnet piece 11b is magnetized in a counterclockwise direction about the rotation axis X1 and in a direction inclined radially outward of the rotor 10 with respect to the circumferential direction of the rotor 10.

[0030] The first magnet 12 is arranged in the circumferential direction of the rotor 10 and includes adjacent first magnet pieces 12a and second magnet pieces 12b. The first magnet pieces 12a and second magnet pieces 12b are magnetized in a direction inclined with respect to the circumferential direction of the rotor 10. Specifically, the first magnet piece 12a is magnetized in a clockwise direction about the rotation axis X1 and in a direction inclined radially outward from the rotor 10 with respect to the circumferential direction of the rotor 10. The second magnet piece 12b is magnetized in a clockwise direction about the rotation axis X1 and in a direction inclined radially inward from the circumferential direction of the rotor 10.

[0031] The second magnets 21 and 22 are magnetized in the radial direction of the rotor 10. Specifically, the second magnet 21 is magnetized on the radially outer side of the rotor 10, and the second magnet 22 is magnetized on the radially inner side of the rotor 10.

[0032] The second magnets 21 and 22 are longer in the circumferential direction of the rotor 10 than the first magnets 11 and 12. The first magnets 11 and 12 and the second magnets 21 and 22 have a substantially trapezoidal shape when viewed from the direction of the rotation axis X1 of the rotor 10.

[0033] The first magnet 11 and the second magnet 21 are adjacent to each other. The first magnet 11 has an upper base 11c and a lower base 11d. The lower base 11d is longer than the upper base 11c. The second magnet 21 has an upper base 21c and a lower base 21d. The lower base 21d is longer than the upper base 21c. The upper base 11c of the first magnet 11 and the lower base 21d of the second magnet 21 extend in a continuous manner in the circumferential direction of the rotor 10. The lower base 11d of the first magnet 11 and the upper base 21c of the second magnet 21 extend in a continuous manner in the circumferential direction of the rotor 10. The upper base 11c of the first magnet 11 and the lower base 21d of the second magnet 21 are arranged radially inward of the rotor 10 relative to the lower base 11d of the first magnet 11 and the upper base 21c of the second magnet 21.

[0034] Similarly, the first magnet 12 and the second magnet 22 are adjacent to each other. The first magnet 12 has an upper base 12c and a lower base 12d. The lower base 12d is longer than the upper base 12c. The second magnet 22 has an upper base 22c and a lower base 22d. The lower base 22d is longer than the upper base 22c. The upper base 12c of the first magnet 12 and the lower base 22d of the second magnet 22 extend contiguously in the circumferential direction of the rotor 10. The lower base 12d of the first magnet 12 and the upper base 22c of the second magnet 22 extend contiguously in the circumferential direction of the rotor 10. The upper base 12c of the first magnet 12 and the lower base 22d of the second magnet 22 are disposed radially inward of the rotor 10 relative to the lower base 12d of the first magnet 12 and the upper base 22c of the second magnet 22.

[0035] (One specific example) A motor 100a shown in FIG. 2 is one specific example of the motor 100. The motor 100a includes a stator 30. The stator 30 includes a stator body 30a, a plurality of teeth 30b, and a winding 31. Note that hatching of the winding 31 shown in FIG. 2 and other drawings has been omitted for clarity. The stator body 30a is a cylindrical or annular body. The plurality of teeth 30b protrude radially outward from the outer periphery of the stator body 30a. The winding 31 is wound around the plurality of teeth 30b. The winding 31 is electrically connected to a power source (not shown) via a conductor and is supplied with current as appropriate.

[0036] 3, the second magnets 21, 22 are longer in the circumferential direction of the rotor 10 than the first magnets 11, 12 when viewed from the direction of the rotation axis X1 of the rotor 10. As described above, the first magnets 11, 12 and the second magnets 21, 22 are arranged in a Halbach array in the circumferential direction of the rotor 10.

[0037] Magnetic flux extends from the radially inner side of the rotor 10 to the second magnet 21. Magnetic flux also extends from the first magnet piece 12a of the first magnet 12 in the clockwise direction of the rotor 10 and in a direction inclined radially outward of the rotor 10 with respect to the circumferential direction of the rotor 10. Magnetic flux extends from the second magnet piece 12b in the clockwise direction of the rotor 10 and in a direction inclined radially inward of the rotor 10 with respect to the circumferential direction of the rotor 10.

[0038] Furthermore, magnetic flux extends from the second magnet 22 radially inward of the rotor 10. Furthermore, magnetic flux extends from the first magnet piece 11a of the first magnet 11 in the counterclockwise direction of the rotor 10, in a direction inclined radially inward of the rotor 10 with respect to the circumferential direction of the rotor 10. Magnetic flux extends from the second magnet piece 11b in the counterclockwise direction of the rotor 10, in a direction inclined radially outward of the rotor 10 with respect to the circumferential direction of the rotor 10. As a result, magnetic fields are concentrated radially inward of the rotor 10 from the first magnet 11, the second magnet 21, the first magnet 12, and the second magnet 22.

[0039] When a current is supplied to the windings 31 of the stator 30, a magnetic field is generated, and the first magnet 11, the second magnet 21, the first magnet 12, and the second magnet 22 are given a force in the rotation direction of the rotor 10. This causes the rotor 10 to rotate, and the motor 100a can generate torque via the rotor 10.

[0040] As described above, with the configuration of the motor 100a described above, the first magnets 11, 12 and the second magnets 21, 22 have a substantially trapezoidal shape. This makes it easier for magnetic flux to concentrate on the radially inner side of the rotor 10. This allows for increased torque.

[0041] Furthermore, with the configuration of the motor 100a, the upper bases 11c, 12c, 21c, and 22c and the lower bases 11d, 12d, 21d, and 22d of adjacent first magnets 11, 12 and second magnets 21, 22 extend in a circumferentially continuous manner. The first magnet pieces 11a, 12a and the second magnet pieces 11b, 12b are magnetized in a predetermined direction. This facilitates the concentration of magnetic flux on the radially inner side of the rotor 10, thereby increasing torque.

[0042] (Embodiment 2) A second embodiment will be described with reference to Figures 4 to 6. Figure 4 is a schematic cross-sectional view showing an example of the configuration of a motor according to the second embodiment. Figure 5 is a schematic cross-sectional view showing a specific example of the motor shown in Figure 4. Figure 6 is a schematic cross-sectional view showing a main part of the specific example of the motor shown in Figure 5. A motor 200 according to the second embodiment has the same configuration as the motor 100 according to the first embodiment, except for second magnets 21 and 22.

[0043] The motor 200 includes second magnets 121 and 122. The second magnets 121 and 122 have the same configuration as the second magnets 21 and 22, except that they include third magnet pieces 21a and 22a and fourth magnet pieces 21b and 22b. The first magnet 11, the second magnet 121, the first magnet 12, and the second magnet 122 are arranged in a Halbach array in the circumferential direction of the rotor 10. The first magnet 11, the second magnet 121, the first magnet 12, and the second magnet 122 are arranged alternately and adjacent to each other.

[0044] The second magnet 121 is arranged in the circumferential direction of the rotor 10 and includes adjacent third magnet pieces 21a and fourth magnet pieces 21b. The third magnet pieces 21a and fourth magnet pieces 21b are magnetized radially outward of the rotor 10 and in a direction inclined with respect to the radial direction of the rotor 10. Specifically, the third magnet piece 21a is magnetized radially outward of the rotor 10 and in a direction inclined clockwise with respect to the radial direction of the rotor 10. The fourth magnet piece 21b is magnetized radially outward of the rotor 10 and in a direction inclined counterclockwise with respect to the radial direction of the rotor 10.

[0045] The second magnet 122 is arranged in the circumferential direction of the rotor 10 and includes adjacent third magnet pieces 22a and fourth magnet pieces 22b. The third magnet pieces 22a and fourth magnet pieces 22b are magnetized radially inward of the rotor 10 and in a direction inclined with respect to the radial direction of the rotor 10. Specifically, the third magnet piece 22a is magnetized radially inward of the rotor 10 and in a direction inclined with respect to the radial direction of the rotor 10. The fourth magnet piece 22b is magnetized radially inward of the rotor 10 and in a direction inclined with respect to the radial direction of the rotor 10.

[0046] (One specific example) 5 is a specific example of the motor 200. The motor 200a includes a stator 30, similar to the motor 100 shown in FIG.

[0047] 6, the second magnets 121, 122 are longer in the circumferential direction of the rotor 10 than the first magnets 11, 12 when viewed from the direction of the rotation axis X1 of the rotor 10. As described above, the first magnets 11, 12 and the second magnets 121, 122 are arranged in a Halbach array in the circumferential direction of the rotor 10.

[0048] Magnetic flux extends from the radially inner side of the rotor 10 to the third magnet piece 21a of the second magnet 121, and in a direction inclined in the clockwise direction of the rotor 10 with respect to the radial direction of the rotor 10. Magnetic flux extends from the radially inner side of the rotor 10 to the fourth magnet piece 21b, and in a direction inclined in the counterclockwise direction of the rotor 10 with respect to the radial direction of the rotor 10.

[0049] Furthermore, magnetic flux extends from the third magnet piece 22a of the second magnet 122 radially inward of the rotor 10 in a direction inclined counterclockwise with respect to the radial direction of the rotor 10. Magnetic flux extends from the fourth magnet piece 22b radially inward of the rotor 10 in a direction inclined clockwise with respect to the radial direction of the rotor 10.

[0050] 3, magnetic flux extends from the first magnet piece 12a of the first magnet 12 in the clockwise direction of the rotor 10 and in a direction inclined radially outward of the rotor 10 with respect to the circumferential direction of the rotor 10. Magnetic flux extends from the second magnet piece 12b in the clockwise direction of the rotor 10 and in a direction inclined radially inward of the rotor 10 with respect to the circumferential direction of the rotor 10. Magnetic flux extends from the first magnet piece 11a of the first magnet 11 in the counterclockwise direction of the rotor 10 and in a direction inclined radially inward of the rotor 10 with respect to the circumferential direction of the rotor 10. Magnetic flux extends from the second magnet piece 11b in the counterclockwise direction of the rotor 10 and in a direction inclined radially outward of the rotor 10 with respect to the circumferential direction of the rotor 10.

[0051] These magnetic fluxes cause magnetic fields to be concentrated radially inward of the rotor 10 from the first magnet 11, the second magnet 121, the first magnet 12, and the second magnet 122.

[0052] When a current is supplied to the windings 31 of the stator 30, a magnetic field is generated, and the first magnet 11, the second magnet 121, the first magnet 12, and the second magnet 122 are given a force in the rotation direction of the rotor 10. This causes the rotor 10 to rotate, and the motor 200a can generate torque via the rotor 10.

[0053] 2 and 3, the configuration of the motor 200a is such that magnetic flux tends to concentrate radially inward of the rotor 10. This makes it possible to increase torque.

[0054] Furthermore, the configuration of the motor 200a described above differs from that of the motor 100a in that the third magnet pieces 21a and 22a of the second magnet 121 and the fourth magnet pieces 21b and 22b of the second magnet 122 are each magnetized in a predetermined direction. This makes it easier for the magnetic flux to concentrate radially inward of the rotor 10. This allows for increased torque.

[0055] (Simulation results) Next, referring to FIG. 7, the results of a simulation of the relationship between rotation speed and torque for examples of motors 100a and 200a according to the first and second embodiments and a comparative example of motor 900a relating to the problem that the present disclosure aims to solve will be described.

[0056] Motor 100a Example 1 shown in Figures 2 and 3 was driven under predetermined conditions within a predetermined range of rotation speeds, and the change in torque value was calculated. Similarly, motor 200a Example 2 shown in Figures 5 and 6 was driven under predetermined conditions within a predetermined range of rotation speeds, and the change in torque value was calculated. Similarly, motor 900a Comparative Example 1 shown in Figures 9 and 10 was driven under predetermined conditions within a predetermined range of rotation speeds, and the change in torque value was calculated. Figure 7 shows the calculated torque values ​​versus rotation speed for each motor.

[0057] 7, the torque value Tr9 of Comparative Example 1 was approximately 27.8 Nm at a rotation speed of approximately 50 to 700 rpm. On the other hand, the torque value Tr1 of Example 1 was approximately 28.9 Nm at a rotation speed of approximately 50 to 700 rpm. The torque value Tr2 of Example 2 was approximately 30.4 Nm at a rotation speed of approximately 50 to 700 rpm.

[0058] The torque value Tr1 of Example 1 is higher than the torque value Tr9 of Comparative Example 1. The motor of Example 1 can output a higher torque than the motor of Comparative Example 1.

[0059] Furthermore, the torque value Tr2 of Example 2 is higher than the torque value Tr9 of Comparative Example 1 and the torque value Tr1 of Example 1. The motor of Example 2 can output higher torque than the motors of Comparative Example 1 and Example 1.

[0060] The motors 100, 100a, 200, and 200a described above can output large torque. Therefore, the motors described above are suitable for installation in devices requiring high output, such as robots, vehicles, drones, and electric aircraft. Such robots can be used for a wide range of applications, including industrial robots and collaborative robots.

[0061] The present disclosure is not limited to the above-described embodiment, and can be appropriately modified without departing from the spirit and scope of the present disclosure. Furthermore, the present disclosure may be implemented by appropriately combining the above-described embodiment and examples thereof. [Explanation of symbols]

[0062] 100, 100a, 200, 200a motor 10, 210 rotor 10a Rotor body 11, 12 First magnet 11a, 12a First magnet piece 11b, 12b Second magnet piece 11c, 12c top bottom 11d, 12d bottom 21, 22, 121, 122 Second magnet 21a, 22a Third magnet piece 21b, 22b Fourth magnet piece 21c, 22c top bottom 21d, 22d bottom 30 Stator 30a Stator body 30b Teeth 31 windings X1, X2, X9 rotation axes Tr1, Tr2, Tr9 torque values

Claims

[Claim 1] A motor having a rotor, The rotor includes a plurality of first and second magnets arranged in a Halbach array in the circumferential direction of the rotor, the plurality of first and second magnets are arranged alternately and adjacent to each other; the second magnet is longer than the first magnet in the circumferential direction of the rotor; the first and second magnets have a substantially trapezoidal shape when viewed from the direction of the rotation axis of the rotor, each of the first and second adjacent magnets has an upper base and a lower base that is longer than the upper base; an upper base of the first magnet and a lower base of the second magnet extend continuously in the circumferential direction; a lower base of the first magnet and an upper base of the second magnet extending continuously in the circumferential direction; an upper base of the first magnet and a lower base of the second magnet are disposed radially inward of the rotor relative to the lower base of the first magnet and the upper base of the second magnet; the first magnet includes first and second magnet pieces arranged in the circumferential direction of the rotor and adjacent to each other; the first magnet piece is disposed rearward in a clockwise direction around the rotation axis of the rotor, and the second magnet piece is disposed frontward in a clockwise direction around the rotation axis of the rotor; When the first magnet is magnetized in the counterclockwise direction around the rotation axis of the rotor, the first magnet pieces are magnetized in a direction inclined radially inward of the rotor with respect to the circumferential direction of the rotor, and magnetic flux extends from the first magnet pieces in a counterclockwise direction of the rotor and in a direction inclined radially inward of the rotor with respect to the circumferential direction of the rotor; the second magnet pieces are magnetized in a direction inclined radially outward of the rotor with respect to the circumferential direction of the rotor, and magnetic flux extends from the second magnet pieces in a counterclockwise direction of the rotor with respect to the circumferential direction of the rotor, in a direction inclined radially outward of the rotor with respect to the circumferential direction of the rotor; When the first magnet is magnetized in the clockwise direction around the rotation axis of the rotor, the first magnet pieces are magnetized in a direction inclined radially outward of the rotor with respect to the circumferential direction of the rotor, and magnetic flux extends from the first magnet pieces in a clockwise direction of the rotor and in a direction inclined radially outward of the rotor with respect to the circumferential direction of the rotor; The second magnet pieces are magnetized in a direction inclined radially inward of the rotor with respect to the circumferential direction of the rotor, and magnetic flux extends from the second magnet pieces in a clockwise direction of the rotor and in a direction inclined radially inward of the rotor with respect to the direction of the rotor; the second magnet includes third and fourth magnet pieces arranged in the circumferential direction of the rotor and adjacent to each other; the third magnet piece is disposed rearward in a clockwise direction around the rotation axis of the rotor, and the fourth magnet piece is disposed frontward in a clockwise direction around the rotation axis of the rotor; When the second magnet is magnetized radially outward of the rotor, The third magnet piece is magnetized in a direction inclined in a clockwise direction of the rotor with respect to the radial direction of the rotor, and a magnetic flux extends from the radially inner side of the rotor to the third magnet piece in a direction inclined in a clockwise direction of the rotor with respect to the radial direction of the rotor, The fourth magnet piece is magnetized in a direction inclined in a counterclockwise direction of the rotor with respect to the radial direction of the rotor, and a magnetic flux extends from the radially inner side of the rotor to the fourth magnet piece in a direction inclined in a counterclockwise direction of the rotor with respect to the radial direction of the rotor, When the second magnet is magnetized radially inward of the rotor, the third magnet piece is magnetized in a direction inclined in a counterclockwise direction of the rotor with respect to the radial direction of the rotor, and magnetic flux extends from the third magnet piece to an inner side in the radial direction of the rotor and in a direction inclined in a counterclockwise direction of the rotor with respect to the radial direction of the rotor; the fourth magnet piece is magnetized in a direction inclined in a clockwise direction of the rotor with respect to a radial direction of the rotor, and a magnetic flux extends from the fourth magnet piece to an inner side in the radial direction of the rotor and in a direction inclined in a clockwise direction of the rotor with respect to the radial direction of the rotor; the first magnet magnetized in a counterclockwise direction around the rotation axis of the rotor, the second magnet magnetized on the radially outer side of the rotor, the first magnet magnetized in a clockwise direction around the rotation axis of the rotor, and the second magnet magnetized on the radially inner side of the rotor are alternately arranged and adjacent to each other; Motor.

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