Motor rotor and motor with same

Abstract

The invention discloses a motor rotor and a motor with the same. The motor rotor comprises a main body and multiple steel magnets, wherein the main body is provided with a rotor hole and multiple steel magnet grooves encircling the rotor hole; the outer profile of the main body comprises a plurality of concentric arc sections concentric with the rotor hole and connecting line segments connected between adjacent concentric arc sections; the concentric arc sections are in one-one correspondence with the steel magnet grooves in the radial direction respectively; each connecting line segment comprises one or more straight line segments; the included angle beta between the central normal line of each straight line segment and the connected line of the midpoint of the central normal line and the center of the rotor hole is not smaller than 0 degree and not greater than 20 degrees; at least one steel magnet is arranged inside each steel magnet groove. According to the motor rotor provided by the embodiment of the invention, the outer profile of the main body comprises the concentric arc sections and connecting line segments connected between adjacent concentric arc sections, so that the reduction of the counter potential harmonic content of the motor is facilitated, and the cogging torque pulsation and electromagnetic torque pulsation of the motor are reduced.

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

Images