Motor rotor and motor with same

Abstract

The invention discloses a motor rotor and a motor having the same. The motor rotor includes: a body with a rotor hole and a plurality of magnetic steel grooves surrounding the rotor hole. The outer contour of the body includes a plurality of concentric arc segments concentric with the rotor hole and connected to The connecting line segment between the concentric arc segments, the plurality of concentric arc segments correspond to the plurality of magnetic steel slots in the radial direction, and the connecting line segment includes at least one straight line segment, wherein each straight line The angle between the center normal of the line segment and the line connecting the midpoint and the center of the rotor hole is β, 0°≤β≤20°; a plurality of magnetic steels, wherein each magnetic steel slot is provided with at least one magnetic steel. According to the motor rotor of the embodiment of the present invention, by making the outer contour of the body include a plurality of concentric arc segments and connecting line segments connected between adjacent concentric arc segments, it is beneficial to reduce the back EMF harmonic content of the motor, reducing Motor cogging torque and electromagnetic torque ripple.

Description

technical field [0001] The invention relates to the field of motors, in particular to a motor rotor and a motor with the same. Background technique [0002] In the traditional built-in permanent magnet motor, there are the following problems: [0003] 1. The cogging torque of the motor is large, and the electromagnetic torque ripple is large; [0004] 2. The back EMF harmonic content is high, especially the low frequency harmonic content is very high; [0005] 3. The inductance of the quadrature axis of the motor is large, and the power factor of the motor is low, resulting in a large controller capacity and high cost; [0006] 4. Low motor efficiency; [0007] 5. The motor has a lot of noise and vibration. [0008] In this regard, there is an existing improved solution in which the center of the inner arc end surface of the stator tooth and the center of the outer arc of the rotor are both deviated from the center of the rotor hole. However, although this solution solv...

AI Technical Summary

Problems solved by technology

[0003] 1. The cogging torque of the motor is large, and the electromagnetic torque ripple is large;

[0004] 2. The back EMF harmonic content is high, especially the low frequency harmonic content is very high;

[0005] 3. The inductance of the quadrature axis of the motor is large, and the power factor of the motor is low, resulting in a large controller capacity and high cost;

[0006] 4. The efficiency of the motor is low;

[0007] 5. The motor has a lot of noise and vibration

However, although this solution solves the above-mentioned first and second problems, it still has defects

Specifically, the eccentricity of the inner arc of the stator will reduce the area of ​​the stator slot and the number of turns of the motor, thereby affecting the efficiency of the motor; in addition, the increase of the tooth harmonics of the motor will increase the radial vibration, resulting in electromagnetic vibration and increase in noise

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