Research on Slot Torque of Surface Mounted Permanent Magnet Motor Under Rotor Eccentricity
The phenomenon of rotor eccentricity in surface mounted permanent magnet motors is commonly observed in engineering practice.Rotor eccentricity causes distortion of the air-gap magnetic field,which subsequently influences the cogging torque.The influence of rotor eccentricity on the performance of surface-mounted permanent magnet motor was examined by using a magnetic field analytical model based on the sub-domain method.The two-dimensional plane of the motor was partitioned into several subdomains,and by ap-plying boundary conditions,the set of equations was solved to derive the magnetic field distribution and cog-ging torque.Comparisons were made between the air gap magnetic flux density and cogging torque results ob-tained from the subdomain method model and those from the finite element method.Additionally,an analysis of the cogging torque of the prototype under eccentric conditions was conducted.It was revealed that,at low-er eccentricity ratios,there was a positive correlation between the prototype's torque improvement ratio and its eccentricity ratio.The accuracy of the magnetic field analytical model based on subdomain method has been validated through prototype experiments.This model can predict the impact of rotor eccentricity during the design phase and serves as a valuable reference for motor design.
万方数据
维普
