Optimum Design Of Linear Oscillating Motor For Refrigeration Compressor

With the rapid development of linear oscillating motor and higher requirement of environmental protection,linear oscillating motor is used as drive mechanism of refrigeration compressors more and more widely.The traditional refrigeration compressor adopts the crank,connecting rod and other transmission mechanism to drive the piston to do straight reciprocating motion,which has more friction loss and noise,result in the low compressor efficiency.First,the basic structure and research status of the linear oscillating motor are introduced in this paper.The linear oscillating motor is modeled by the equivalent magnetic circuit method and the expression of the electromagnetic thrust is deduced.Thus,the electromagnetic system model and the dynamic model of the linear oscillating motor can be established.With the obtained system equation of the linear oscillating motor,the concrete design requirement of the linear oscillating motor is put forward.The finite element simulation software was used to model the motor,to study and analyze the magnetic field distribution,back electromotive force,electromagnetic thrust,positioning force and voltage stroke adjustment characteristics of the motor.Then,the motor was simulated and analyzed under the condition of constant damping load.After that,the stator radial thickness and the permanent magnet size of the linear oscillating motor are optimized by parametric scanning.The influence of the different permanent magnet size on the positioning force and the electromagnetic force is studied.Also,the axial length and the length of the permanent magnet and magnetizing direction thickness are obtained.The mechanical resonance state of linear oscillating motor is analyzed in finite element simulation.Finally,a prototype was fabricated and its performance was tested by experiment.Compared with the simulation results of finite element,the mechanical resonance working condition of the motor was verified.