Research On Permanent Magnet Synchronous Reluctance Motor Used Compressor

Compressor is a device for compressing gas.It is widely used in mining,metallurgy,machinery manufacturing,petrochemical and other industries.The compressor is driven by the motor to convert low-pressure gas into high-pressure gas,which is the heart of the refrigeration system.As the driving device of the compressed gas of the compressor,the motor is the lifeblood of the compressor.The safety and reliability of the motor body system directly affect the quality of the compressor.Therefore,the safety and reliability of the motor body is very important.By analyzing the fires and explosions that have occurred in the past due to the failure of the motor body,in the process of studying the motor,we found that the electromagnetic performance of the motor is an important factor for the safety.Due to environmental stress and expensive rare earth resources,we urgently need to find an excellent motor with high torque density,high efficiency,wide speed range,and low cost.As a current new type of motor,the permanent magnet synchronous reluctance motor is a research hotspot of domestic and foreign scholars and has not yet entered the industry.Applications are currently in the laboratory incubation stage.This article first explains the background and significance of permanent magnet synchronous reluctance motors and the current research status at home and abroad.Two types of rotor structures are introduced: axially laminated and laterally laminated,the space vector diagram and the mathematical model of the synchronous reluctance motor and permanent magnet synchronous reluctance motor are established,derived the voltage equation,flux linkage equation,torque equation and so on after adding the permanent magnet,the no-load,straight-axis and quadrature-axis magnetic circuit models of permanent magnet synchronous reluctance motors are introduced.Secondly,on the basis of the original permanent magnet synchronous motor,design the main dimensions,stator and rotor of permanent magnet synchronous reluctance motor,and Ansys Maxwell 2D model is established,and the finite element analysis of the no-load and full-load conditions is carried out.In addition,in view of the electromagnetic performance safety problem of the motor,this paper proposes two schemes of cosine non-uniform air gap structure and the method of opening auxiliary slots on the rotor to optimize the electromagnetic performance of the motor.By comparing and analyzing with a uniform air gap structure,the sinusity of the air gap magnetic density and the back-EMF waveform has been greatly improved during no-load operation.The fundamentalwave amplitude of the air gap magnetic density has increased from 1.18 T to 1.25 T.At the same time,the harmonic content was reduced from 32.48% to 15.04%,the amplitude of the fundamental wave of phase A was increased from 276.8V to 282.9V,and the harmonic content of the opposite potential was reduced from 11.17% to 6.81%,the amplitude of the fundamental wave increases and the harmonic content decreases significantly,the torque ripple is significantly reduced during full load operation,which increases the stability of the motor during operation;Compared with the unopened auxiliary slot,the fundamental wave amplitude is increased from 315 V to 329 V,the third harmonic amplitude is reduced from53.3V to 23.8V,and the distortion rate is reduced from 14.41% to 7.44%.Motor performance and enhance motor safety and reliability...