Rotating electrical machine and rotor of rotating electrical machine

Abstract

A rotating electrical machine is provided with magnets and a rotor core having magnet holes into which the magnets are inserted, the magnets include a first magnet and a second magnet, the second magnet is disposed in a V-shape closer to the inside in the radial direction than the first magnet, and the rotor core has a flux barrier, a bridge, and a second slot. The magnetic flux barrier is formed so as to face a radially outer side surface of the second magnet, the bridge is formed between the second magnet and the magnetic flux barrier, and the second groove is formed so as to face at least a portion of the radially outer side surface of the second magnet on an outer circumferential surface of the rotor core.

Description

Technical Field

[0001] This invention relates to a rotary electric motor and a rotor of the rotary electric motor. Background Technology

[0002] In the rotor structure of rotating electrical machines such as motors and generators, for example, Patent Document 1 below discloses a configuration in which a slot on the outer peripheral surface is arranged between the tangent 1 and the reference line for the purpose of reducing torque pulsation.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: International Publication No. 2019 / 215853 Summary of the Invention

[0006] The problem the invention aims to solve

[0007] Because maximum torque and torque ripple are a trade-off, existing technologies have a problem where torque ripple cannot be reduced while maintaining maximum torque. Therefore, the object of this invention is to provide a rotating electric machine and its rotor that reduce torque ripple while maintaining maximum torque.

[0008] Problem-solving methods

[0009] A rotary electric motor includes a magnet and a rotor core having a magnet hole for inserting the magnet. The magnet includes a first magnet and a second magnet, the second magnet being arranged in a V-shape further radially inward than the first magnet. The rotor core has a flux barrier, a bridge, and a second slot. The flux barrier is formed opposite to a radially outer side of the second magnet. The bridge is formed between the second magnet and the flux barrier. At least a portion of the second slot is formed opposite to the radially outer side of the second magnet on the outer peripheral surface of the rotor core.

[0010] The effects of the invention

[0011] According to the present invention, a rotary electric motor and a rotor of the rotary electric motor can be provided that reduce torque pulsation while maintaining torque. Attached Figure Description

[0012] Figure 1 It is a cross-sectional view of the rotor and stator of a rotating electric machine.

[0013] Figure 2 This is a diagram illustrating the structure of the rotor of a rotary electric machine according to one embodiment of the present invention.

[0014] Figure 3 This is a diagram illustrating the structure of the rotor of a rotary electric machine according to one embodiment of the present invention. Detailed Implementation

[0015] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. The following description and drawings are examples for illustrating the present invention; appropriate omissions and simplifications have been made for clarity of explanation. The present invention may also be implemented in various other ways. Unless otherwise specified, each constituent element may be a single element or a plurality of elements.

[0016] To facilitate understanding of the invention, the positions, sizes, shapes, and extents of the constituent elements shown in the accompanying drawings may not represent their actual positions, sizes, shapes, or extents. Therefore, the invention is not necessarily limited to the positions, sizes, shapes, and extents disclosed in the accompanying drawings.

[0017] (One implementation method and overall structure)

[0018] ( Figure 1 )

[0019] The rotary electric motor 1 has a stator core 2 and a rotor core 3. The rotor core 3 has multiple magnets 20 inserted into magnet holes.

[0020] ( Figure 2 , Figure 3 )

[0021] like Figure 2 As shown, magnets 20 are inserted into the multiple magnet holes 9 of the rotor core 3. Figure 1 It includes a first magnet 21 and a second magnet 22. The first magnet 21 clamps the d-axis in the middle, and the two magnets are arranged in a V-shape along the circumference. The second magnet 22 is located further radially inward than the first magnet 21, clamping the d-axis in the middle, and is also arranged in a V-shape.

[0022] The rotor core 3 has a first groove 4a and a second groove 4b on its outer peripheral surface 4. The first groove 4a is formed on the outer peripheral surface opposite to the radially outer main surface 21a of the first magnet 21. The second groove 4b is formed on the outer peripheral surface 4 of the rotor core 3, at least a portion of which is formed opposite to the radially outer side surface 22a of the second magnet 22.

[0023] Additionally, the rotor core 3 has a flux barrier 5 and a bridge 6. The flux barrier 5 faces the radially outer side 22a of the second magnet 22 and is formed between the second magnet 22 and the outer peripheral surface 4. The bridge 6 is formed between the second magnet 22 and the flux barrier 5. Thus, the flux barrier 5 and the magnet hole into which the second magnet 22 is inserted become independent structures that are not connected.

[0024] like Figure 3As shown, the second groove 4b is formed on the q-axis side with reference to the imaginary line 8 connecting the corner 22b closest to the outer peripheral surface 4 of the second magnet 22 and the center of the rotor core 3. In addition, the innermost peripheral portion 14 of the second groove 4b is located at the same radial position as the outermost peripheral portion of the magnetic flux barrier 5, or is located further radially inward than the outermost peripheral portion of the magnetic flux barrier 5.

[0025] With this structure, the magnetic path between the first slot 4a and the first magnet 21 is narrower than before, making it easier for magnetic flux to flow from the rotor core 3 to the stator core 2 in the air gap between the rotor core 3 and the stator core 2, thereby increasing the torque. Similarly, the magnetic path between the second slot 4b and the magnetic flux barrier 5, by changing from the middle towards the inner diameter side, makes it easier for magnetic flux to flow from the rotor core 3 to the stator core 2 in the air gap between the rotor core 3 and the stator core 2, thereby increasing the torque.

[0026] On the other hand, in the section with the second slot 4b, the magnetic flux is made difficult to flow from the rotor core 3 to the stator core 2, and the magnetic flux density of the rotor core 3 at each rotational position can be controlled, thus reducing torque ripple. Therefore, it is possible to increase torque while reducing torque ripple.

[0027] Alternatively, a shape without the first slot 4a can be adopted. By positioning the second slot 4b closer to the q-axis than the imaginary line 8, torque pulsation can be suppressed while increasing torque.

[0028] According to the embodiments of the present invention described above, the following effects are achieved.

[0029] (1) A rotary motor 1 includes a magnet 20 and a rotor core 3 having a magnet hole 9 for inserting the magnet 20. The magnet 20 includes a first magnet 21 and a second magnet 22, the second magnet 22 being arranged in a V-shape further radially inward than the first magnet 21. The rotor core 3 has a flux barrier 5, a bridge 6, and a second slot 4b. The flux barrier 5 is formed opposite to the radially outer side of the second magnet 22. The bridge 6 is formed between the second magnet 22 and the flux barrier 5. At least a portion of the second slot 4b is formed on the outer peripheral surface of the rotor core 3 opposite to the radially outer side of the second magnet 22. In this way, a rotary motor 1 that reduces torque pulsation while maintaining torque can be provided.

[0030] (2) The innermost circumferential portion 14 of the second groove 4b is located at the same radial position as the outermost circumferential portion of the magnetic flux barrier 5, or is located radially inward than the outermost circumferential portion of the magnetic flux barrier 5. In this way, torque pulsation can be reduced while maintaining torque.

[0031] (3) The rotor core 3 has a first groove 4a, which is formed on the outer peripheral surface opposite to the radially outer main surface 21a of the first magnet 21. In this way, torque pulsation can be reduced while maintaining torque.

[0032] (4) The second slot 4b is formed on the q-axis side based on the imaginary line 8 connecting the corner 22b closest to the outer peripheral surface of the second magnet 22 and the center of the rotor core 3. In this way, torque pulsation can be reduced while maintaining torque.

[0033] (5) The rotary motor 1 has a rotor with the above-described configuration. Thus, it is possible to provide a rotor for the rotary motor 1 that reduces torque pulsation while maintaining torque.

[0034] Furthermore, the present invention is not limited to the embodiments described above, and various modifications and other configurations can be combined without departing from its spirit. Additionally, the present invention is not limited to the structure possessing all the configurations described in the above embodiments, but also includes structures in which a portion of the configuration has been omitted.

[0035] Symbol Explanation

[0036] 1: Rotating motor, 2: Stator core, 3: Rotor core, 4: Outer circumferential surface of rotor core, 4a: First slot, 4b: Second slot, 5: Magnetic flux barrier, 6: Bridge, 8: Imaginary line, 9: Magnet hole, 14: Innermost circumferential part of the second slot, 20: Magnet, 21: First magnet, 21a: Main surface of the first magnet, 22: Second magnet, 22a: Side of the second magnet, 22b: Corner of the second magnet closest to the outer circumferential surface.

Claims

1. A rotary electric motor comprising a magnet and a rotor core having a magnet hole for insertion of the magnet, characterized in that, The magnet includes a first magnet and a second magnet, wherein the second magnet is arranged in a V-shape further radially inward than the first magnet. The rotor core has a magnetic flux barrier, a bridge, and a second slot. The magnetic flux barrier is formed opposite to the radially outer side of the second magnet. The bridge is formed between the second magnet and the magnetic flux barrier. At least a portion of the second slot is formed opposite to the radially outer side of the second magnet on the outer peripheral surface of the rotor core.

2. The rotary motor according to claim 1, characterized in that, The innermost circumference of the second groove is located at the same radial position as the outermost circumference of the magnetic flux barrier, or the innermost circumference of the second groove is located radially inward than the outermost circumference of the magnetic flux barrier.

3. The rotary motor according to claim 1, characterized in that, The rotor core has a first groove, which is formed on the outer peripheral surface opposite to the radially outer main surface of the first magnet.

4. The rotary motor according to claim 1, characterized in that, The second slot is formed on the q-axis side with reference to an imaginary line connecting the corner of the second magnet closest to the outer peripheral surface and the center of the rotor core.

5. A rotor for a rotating electric motor, characterized in that, It is installed on the rotary motor as described in claim 1.

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