Rotor

Abstract

To provide a rotor that can rotate smoothly relative to the axis of rotation. [Solution] A rotor comprising: a fixed rotor fixed to a rotation shaft, including a first rotor core and a plurality of first magnets arranged on the first rotor core at equal angular intervals in the circumferential direction; a rotating rotor adjacent to the fixed rotor in the axial direction of the rotation shaft and rotatable relative to the rotation shaft, including a second rotor core and a plurality of second magnets arranged on the second rotor core at equal angular intervals in the circumferential direction; a stopper provided adjacent to the second rotor core in the axial direction and rotating integrally with the rotation shaft; a pin protruding from the second rotor core in the axial direction and contacting the stopper when the rotating rotor rotates relative to the fixed rotor and the plurality of first magnets and the plurality of second magnets face each other with the same polarity; a spacer positioned inside the second rotor core and rotating integrally with the rotation shaft; and a sliding part positioned between the second rotor core and the spacer.

Description

Technical Field

[0001] The present invention relates to a rotor.

Background Art

[0002] A rotor for a rotating electrical machine is known that includes a fixed rotor fixed to a rotating shaft and a rotating rotor adjacent to the fixed rotor in the axial direction of the rotating shaft and provided rotatably with respect to the rotating shaft (for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the rotor described in Patent Document 1, a rotating shaft, a rotation lock shaft, a hub, and a transmission plate are arranged inside a cylindrical rotating rotor. In such a configuration, it is not possible to arrange a sliding component between the rotating shaft and the rotating rotor, and there is a risk that the rotating rotor cannot rotate smoothly with respect to the rotating shaft. As a result, the performance of the rotating electrical machine may deteriorate.

[0005] Therefore, an object is to provide a rotor in which the rotating rotor can rotate smoothly with respect to the rotating shaft.

Means for Solving the Problems

[0006] The above objective can be achieved by a rotor comprising: a fixed rotor fixed to a rotation shaft, including a first rotor core and a plurality of first magnets arranged on the first rotor core at equal angular intervals in the circumferential direction; a rotating rotor adjacent to the fixed rotor in the axial direction of the rotation shaft and rotatable relative to the rotation shaft, including a second rotor core and a plurality of second magnets arranged on the second rotor core at equal angular intervals in the circumferential direction; a stopper provided adjacent to the second rotor core in the axial direction and rotating integrally with the rotation shaft; a pin protruding from the second rotor core in the axial direction and contacting the stopper when the rotating rotor rotates relative to the fixed rotor and the plurality of first magnets and the plurality of second magnets face each other with the same polarity; a spacer positioned inside the second rotor core and rotating integrally with the rotation shaft; and a sliding part positioned between the second rotor core and the spacer. [Effects of the Invention]

[0007] According to the present invention, it is possible to provide a rotor that can rotate smoothly with respect to the axis of rotation. [Brief explanation of the drawing]

[0008] [Figure 1] Figure 1(a) is a cross-sectional view of a rotor according to an embodiment, Figure 1(b) is a plan view of a fixed rotor viewed from the -X direction, and Figure 1(c) is a plan view of a rotating rotor viewed from the -X direction. [Figure 2] Figures 2(a) and 2(b) are plan views showing the rotation of the rotating rotor relative to the spacer in the embodiment. [Modes for carrying out the invention]

[0009] Figure 1(a) is a cross-sectional view of the rotor 100 according to an embodiment. Figure 1(b) is a plan view of the fixed rotor 20 as seen from the -X direction, and Figure 1(c) is a plan view of the rotating rotor 30a as seen from the -X direction. The axial direction of the rotation axis 10 is defined as the X-axis direction. The directions perpendicular to the X-axis direction and mutually perpendicular are defined as the Y-axis direction and the Z-axis direction. The rotor 100 is used by being incorporated into a rotating electric machine mounted on, for example, a hybrid vehicle, an electric vehicle, or a fuel cell vehicle. Although Figure 1(c) shows the rotating rotor 30a, the configuration of the rotating rotor 30b is similar. As shown in Figures 1(a) to 1(c), the rotor 100 comprises a rotation axis 10, a fixed rotor 20, rotating rotors 30a and 30b, spacers 40a and 40b, sliding parts 50a and 50b, and stoppers 60a and 60b.

[0010] The stationary rotor 20 includes a first rotor core 21 and a plurality of first magnets 22 embedded so as to penetrate the first rotor core 21 in the X-axis direction. The first rotor core 21 has a cylindrical shape extending in the X-axis direction. The first magnets 22 are permanent magnets. The rotating shaft 10 is fitted and fixed into the first rotor core 21. Therefore, the stationary rotor 20 can rotate integrally with the rotating shaft 10. The plurality of first magnets 22 are provided at equal angular intervals in the circumferential direction of the first rotor core 21 so as to have alternating polarities. For example, eight first magnets 22 are provided at equal angular intervals in the circumferential direction of the first rotor core 21.

[0011] The rotating rotors 30a and 30b are provided adjacent to the fixed rotor 20 so as to sandwich it in the X-axis direction. The rotating rotors 30a and 30b include a second rotor core 31 and a plurality of second magnets 32 embedded so as to penetrate the second rotor core 31 in the X-axis direction. The second rotor core 31 has a cylindrical shape with a larger inner diameter than the first rotor core 21 and extends parallel to the X-axis direction. The second magnets 32 are permanent magnets. The second rotor core 31 is not fixed to the rotation shaft 10, but is rotatably mounted to the rotation shaft 10 via sliding parts 50a or 50b. Therefore, the rotating rotors 30a and 30b are mounted on the rotation shaft 10 so as to be rotatable relative to the rotation shaft 10 and the fixed rotor 20. The outer diameter of the second rotor core 31 is approximately the same as the outer diameter of the first rotor core 21.

[0012] Multiple second magnets 32 are arranged at equal angular intervals in the circumferential direction of the second rotor core 31 so that their polarities alternate. For example, eight second magnets 32 are arranged at equal angular intervals in the circumferential direction of the second rotor core 31. The distance from the central axis 11 of the rotation axis 10 to the second magnet 32 ​​is approximately the same as the distance from the central axis 11 to the first magnet 22. Therefore, the second magnets 32 can face the first magnet 22 in the X-axis direction. The number of second magnets 32 is the same as the number of first magnets 22 so that all second magnets 32 face all first magnets 22 in the X-axis direction.

[0013] Spacers 40a and 40b are positioned inside the second rotor core 31 of the rotating rotors 30a and 30b, respectively. Spacers 40a and 40b are cylindrical in shape. The rotating shaft 10 is fitted and fixed to spacers 40a and 40b. Therefore, spacers 40a and 40b are rotatable integrally with the rotating shaft 10. Sliding part 50a is positioned between spacer 40a and the rotating rotor 30a. Similarly, sliding part 50b is positioned between spacer 40b and the rotating rotor 30b. Sliding parts 50a and 50b are bearings, such as bush bearings.

[0014] As shown in Figure 1(a), the stopper 60a is fitted and fixed to one end of the rotating shaft 10. The stopper 60a is adjacent to the spacer 40a in the X-axis direction. Similarly, the stopper 60b is fitted and fixed to the other end of the rotating shaft 10. The stopper 60b is adjacent to the spacer 40b in the X-axis direction. The stoppers 60a and 60b are formed with a thickness in the X-axis direction that is thinner than that of the fixed rotor 20 and the rotating rotors 30a and 30b. As shown in Figure 1(c), the stopper 60a has a disc portion 61 and two protrusions 63 that project radially outward from the disc portion 61 when viewed from the -X direction. The two protrusions 63 project in opposite directions to each other. The shape of the stopper 60a is symmetrical with respect to the central axis 11 when viewed from the -X direction. The same applies to the stopper 60b. The stoppers 60a and 60b prevent the rotating rotors 30a and 30b from falling off the rotating shaft 10, respectively.

[0015] As shown in Figures 1(a) and 1(c), the second rotor core 31 of the rotating rotor 30a has two pins 36a embedded in it that extend in the X-axis direction. The two pins 36a are positioned symmetrically with respect to the central axis 11. The tips of the pins 36a protrude from the side of the second rotor core 31 opposite to the fixed rotor 20. As shown in Figure 1(c), the pins 36a are positioned radially outward from the disc portion 61 of the stopper 60a and are in a position to contact the protrusion 63. The two pins 36a are positioned inward from the two S-pole second magnets 32 of the second rotor core 31. Similarly, the second rotor core 31 of the rotating rotor 30b also has two pins 36b attached to it.

[0016] The rotating shaft 10, spacers 40a and 40b, sliding parts 50a and 50b, and stoppers 60a and 60b may be formed from, for example, iron materials such as carbon steel or special steel, or metal materials such as non-magnetic aluminum or stainless steel. The first rotor core 21 and the second rotor core 31 may be formed from electromagnetic steel sheets, amorphous metals, nanocrystalline soft magnetic materials, or magnetic materials such as compacted magnetic cores.

[0017] Figures 2(a) and 2(b) are plan views showing the rotation of the rotating rotor 30a relative to the spacer 40a in the embodiment. The rotation of the rotating rotor 30b relative to the spacer 40b is similar, so its illustration and explanation are omitted. Figure 2(a) shows the case where the rotating rotor 30a rotates relative to the fixed rotor 20 and spacer 40a such that the second magnet 32 ​​of the rotating rotor 30a faces the first magnet 22 of the fixed rotor 20 with the same polarity (N poles facing each other or S poles facing each other). Facing each other with the same polarity is sometimes called same-polarity facing. Figure 2(b) shows the case where the rotating rotor 30a rotates relative to the fixed rotor 20 and spacer 40a such that the second magnet 32 ​​of the rotating rotor 30a faces the first magnet 22 of the fixed rotor 20 with the opposite polarity (N pole and S pole facing each other). Facing each other with opposite polarity is sometimes called opposite-polarity facing. Whether to use same-pole opposing or opposite-pole opposing configurations is selected by controlling the phase of the current supplied to the stator coil of the rotating electric machine to rotate the rotating rotors 30a and 30b.

[0018] As shown in Figures 2(a) and 1(b), when the second magnet 32 ​​of the rotating rotor 30a and the first magnet 22 of the stationary rotor 20 are opposite each other with the same polarity, the effective magnetic flux from the first magnet 22 and the second magnet 32 ​​increases. Therefore, the magnetomotive force increases, and when the rotating electric machine equipped with the rotor 100 is operated as an electric motor, high torque characteristics can be obtained, and when it is operated as a generator, high power generation characteristics can be obtained.

[0019] In the case of opposing polarities, the rotating rotor 30a rotates relative to the rotation shaft 10, and the pin 36a of the second rotor core 31 contacts the side surface of the protrusion 63 of the stopper 60a. As a result, the torque of the rotating rotor 30a is transmitted to the rotation shaft 10 via the stopper 60a. Therefore, for example, when a rotating magnetic field is formed by passing current through the stator coil, the torque of the rotating rotor 30a is transmitted to the rotation shaft 10 in addition to the torque of the fixed rotor 20. Furthermore, the rotational energy of the rotation shaft 10 can be converted into current flowing through the stator coil and regenerated.

[0020] When the rotating rotor 30a rotates relative to the rotating shaft 10 and the pin 36a abuts against the side surface of the protrusion 63, the second magnet 32 of the rotating rotor 30a and the first magnet 22 of the fixed rotor 20 face each other with the same poles. That is, the above abutment also has a function of positioning the rotating rotor 30a so that the second magnet 32 of the rotating rotor 30a faces the first magnet 22 of the fixed rotor 20 with the same poles without rotating too much. The same applies to the rotating rotor 30b.

[0021] As shown in FIGS. 2(b) and 1(b), when the second magnet 32 of the rotating rotor 30a and the first magnet 22 of the fixed rotor 20 face each other with opposite poles, the amount of effective magnetic flux by the first magnet 22 and the second magnet 32 decreases. Therefore, a weakening field effect is obtained. When the rotating electrical machine including the rotor 100 is operated as a motor, an effect of improving the efficiency in the low torque region drive is obtained, and when it is operated as a generator, an effect of improving the efficiency in the low power generation region is obtained.

[0022] In the case of opposite pole facing, the pin 36a of the second rotor core 31 does not contact the stopper 60a. From the case of the same pole facing, when the second rotor core 31 rotates 45 degrees counterclockwise with respect to the rotating shaft 10, it becomes opposite pole facing. The spacer 40a and the fixed rotor 20 rotate integrally with the rotating shaft 10, and since the second magnet 32 of the rotating rotor 30a faces the first magnet 22 of the fixed rotor 20 with opposite poles, the rotating rotor 30a rotates in synchronization with the fixed rotor 20. Therefore, in the case of opposite pole facing, the rotating rotor 30a and the spacer 40a maintain the state shown in FIG. 2(b) and rotate together with the rotating shaft 10.

[0023] The stoppers 60a and 60b having such functions are provided at positions adjacent to the rotating rotors 30a and 30b in the X-axis direction, respectively. For this reason, it is possible to arrange the sliding parts 50a and 50b inside the second rotor cores 31 of the rotating rotors 30a and 30b without interfering with the stoppers 60a and 60b. Thereby, the rotating rotors 30a and 30b can rotate smoothly with respect to the rotating shaft 10. By using such a rotor 100, a decrease in the performance of the rotating electrical machine is suppressed.

[0024] As described above, the embodiments of the present invention have been described in detail. However, the present invention is not limited to such specific embodiments, and various modifications and changes are possible within the scope of the gist of the present invention described in the claims.

Explanation of Signs

[0025] 10... Rotation axis, 11... Central axis, 20... Fixed rotor, 21... First rotor core, 22... First magnet, 30a, 30b... Rotating rotors, 31... Second rotor core, 32... Second magnet, 36a, 36b... Pins, 40a, 40b... Spacers, 50a, 50b... Sliding parts, 60a, 60b... Stoppers, 100... Rotor

Claims

[Claim 1] A fixed rotor, which includes a first rotor core and a plurality of first magnets arranged on the first rotor core at equal angular intervals in the circumferential direction, is fixed to the rotating shaft. A rotating rotor comprising a second rotor core and a plurality of second magnets arranged on the second rotor core at equal angular intervals in the circumferential direction, adjacent to the fixed rotor in the axial direction of the rotation axis and rotatable with respect to the rotation axis, A stopper is provided adjacent to the second rotor core in the axial direction and rotates integrally with the rotation axis, A pin protruding axially from the second rotor core, which contacts the stopper when the rotating rotor rotates relative to the stationary rotor and the plurality of first magnets and the plurality of second magnets face each other with the same polarity, A spacer positioned inside the second rotor core and rotating integrally with the rotation axis, A sliding component positioned between the second rotor core and the spacer, A rotor equipped with a rotor.

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