Rotor component and permanent magnet motor

Abstract

The application provides a rotor component and a permanent magnet motor. The rotor component includes a rotor core (1), a mounting grooves (2) are disposed on the rotor core (1) in a circumferential direction, permanent magnets (3) are mounted in the mounting grooves (2), first air grooves (4) are arranged on the center line of a magnetic pole, the two ends of the mounting grooves (2) are respectively provided with second air grooves (5), and third air grooves (6) are arranged at one side, close to the second air grooves (5), between the center line of the magnetic pole and the second air grooves (5). The rotor component can greatly reduce the torque fluctuation of the permanent magnet motor during operation on the premise of ensuring the electromagnetic torque of the motor.

Description

technical field [0001] The present application relates to the field of motor technology, in particular to a rotor assembly and a permanent magnet motor. Background technique [0002] Torque fluctuation is an inherent characteristic of the motor, which increases the torque fluctuation during the operation of the motor, thereby causing the vibration and operating noise of the motor to increase. The main pole magnetic field of the rotor is generally a non-strict sinusoidal magnetic field, which contains some harmonics, and when the motor load is running, due to the armature reaction, the flux density waveform will further deteriorate, the harmonic distortion rate will increase, and the motor torque fluctuation will increase. How to weaken the permanent magnet motor Torque ripple is an industry problem. An effective measure is to open some slots on the pole piece of the rotor to weaken the armature reaction of the motor, thereby reducing the air gap flux density distortion rate...

AI Technical Summary

Problems solved by technology

[0003] However, it has been found through research that although the torque ripple can be reduced in the prior art, more air gaps on the pole pieces will weaken the amplitude of the air gap flux density, resulting in a significant drop in the output torque of the motor, resulting in a decline in the motor's operating performance

On the other hand, the number, shape, and position of slots are closely related to the structure of the rotor. When the rotor structure of the motor changes, its effect will be reduced or even counterproductive.

Images