制冷压缩机电机转子不平衡电磁力计算与改善

Calculation and Improvement of Unbalanced Electromagnetic Force of Refrigerating Compressor Motor Rotor

在旋转式压缩机的装配过程中,电机一般采用悬臂梁式安装方式,会造成转子偏心,电机磁路不对称,产生不平衡磁拉力,进而导致电机转子与定子相互碰撞。以某型号压缩机为例,根据麦克斯韦应力张量法与交流电磁铁理论,建立了电机径向不平衡电磁力计算模型,采用有限元Ansoft Maxwell软件进行仿真。并将径向不平衡电磁力的计算结果输入到有限元软件,根据模拟结果,提出将定子向下移动5 mm的改善方案。经过后期试验验证,改善后的电机不仅不平衡磁拉力有所减小,而且压缩机主要工作性能不会降低。

During the assembling process of rotary compressor,the cantilever beam installed type is usually used for the motor,which will cause the eccentricity of the rotor,asymmetry of the magnetic circuit of the motor,and unbalanced magnetic pull force,which will further lead to the collision between the rotor and the stator of the motor.By taking a certain type of compressor as an example,according to Maxwell stress tensor method and AC electromagnet theory,the calculation model of radial unbalanced electromagnetic force of the motor was established,and simulated by finite element software Ansoft Maxwell.The calculation results of the radial unbalanced electromagnetic force were input into the finite element software.According to the simulation results,an improvement scheme of moving the stator down by 5 mm was proposed.The experimental results show that the improved motor will not reduce the main performance of the compressor.