Permanent magnet synchronous motor for compressor

Abstract

The invention discloses a permanent magnet synchronous motor, comprising a stator and a rotor which are formed by laminating electromagnetic steel plates, wherein the rotor is arranged inside the stator, a plurality of magnet accommodating slots extending in the length direction of the rotor and distributed circumferentially in a V-shaped structure are formed in the end face of the rotor, permanent magnets having the same magnetic poles are arranged in the magnet accommodating slots, and meanwhile, permanent magnets having opposite magnetic poles are arranged in any two adjacent magnet accommodating slots; an arc groove extending in the length direction of the rotor is formed in the outer circumferential surface of the rotor between any two adjacent magnet accommodating slots; at least one first gap hole group and one second gap hole group extending in the length direction of the rotor are formed in a gap part between the outer side of each magnet accommodating slot and the outer circumference of the rotor; thus, the magnetic flux density distribution of the air gap part between the stator and the rotor is smoothed circumferentially, and then noise and vibration of the permanent magnet synchronous motor are reduced.

Description

technical field [0001] The invention relates to the technical field of synchronous motors, in particular to a permanent magnet synchronous motor used in compressors. Background technique [0002] At present, in the permanent magnet synchronous motor with 3n (n=1,2,3...) slots in the motor stator and 2n (n1,2,3...) poles in the rotor, the stator winding adopts concentrated winding and excitation Rare earth NdFeB permanent magnets are used to achieve high efficiency of the motor. However, the use of rare earth NdFeB materials with high remanence has the problem of increased harsh mid- and low-frequency noise in compressors equipped with air conditioners and refrigerators. Secondly, due to the rapid development of modern power electronics technology, the current output by the controller used in the motor drive has been able to achieve a sinusoidal waveform, and only the fundamental wave component plays an effective role in the torque, thus requiring the induction in the motor ...

AI Technical Summary

Problems solved by technology

However, the use of rare earth NdFeB materials with high remanence, in compressors equipped with air conditioners, refrigerators, etc., has the problem of increased noise in the middle and low frequency bands.

Secondly, due to the rapid development of modern power electronics technology, the current output by the controller used in the motor drive has been able to achieve a sinusoidal waveform, and only the fundamental wave component plays an effective role in the torque, thus requiring the induction in the motor stator winding The voltage should be as sinusoidal as possible, and its high-frequency components will affect the torque fluctuation, which will increase the noise and vibration. Since the voltage induced in the stator winding will form a distortion component containing many high-order harmonics, the iron loss will increase and the efficiency of the motor will be reduced.

Images