表贴式永磁电机转子偏心下齿槽转矩研究  

Research on Slot Torque of Surface Mounted Permanent Magnet Motor Under Rotor Eccentricity

作　　者：卜凡 郗珂庆 胡博 BU Fan;XI Keqing;HU Bo(Xi’an Aerospace Propulsion Testing Technology Research Institute,Xi’an 710025,China)

机构地区：[1]西安航天动力测控技术研究所,西安710025

出　　处：《微电机》2024年第10期26-31,共6页Micromotors

摘　　要：在工程实践中,表贴式永磁电机转子偏心难以避免。转子偏心导致气隙磁场发生畸变,进而影响齿槽转矩。该研究旨在通过一种基于子域法的磁场解析模型,探讨转子偏心对表贴式永磁电机性能的影响。将电机二维平面分为若干子域,通过结合边界条件求解方程组,获取了磁场分布及齿槽转矩。研究对比了子域法模型与有限元法计算气隙磁通密度和齿槽转矩的结果,并分析了样机在偏心条件下的齿槽转矩,结果显示在偏心率较低时,样机转矩提升量与其偏心率呈正比例。文章通过样机实验验证了模型的准确性。通过该模型可在设计阶段估算转子偏心带来的影响,为电机的设计工作提供了有力的参考依据。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 subdomain method.The two-dimensional plane of the motor was partitioned into several subdomains,and by applying boundary conditions,the set of equations was solved to derive the magnetic field distribution and cogging torque.Comparisons were made between the air gap magnetic flux density and cogging torque results obtained 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 lower 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.

关 键 词：永磁电机 转子偏心 子域法 齿槽转矩 

分 类 号：TM351[电气工程—电机]