考虑材料非线性覆铜实心转子感应电机转子阻抗参数的二维解析计算  

2D Analytic Calculation of Rotor-Impedance Parameters in Copper-Coated Solid Rotor Induction Motors Considering the Nonlinear Material

作　　者：朱利伟 邓智泉[1] Zhu Liwei;Deng Zhiquan(College of Automation Engineering Nanjing University of Aeronautics and Astronautics,Nanjing 211106,China)

机构地区：[1]南京航空航天大学自动化学院,南京211106

出　　处：《电工技术学报》2024年第24期7688-7699,共12页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金资助项目(52177049)。

摘　　要：覆铜实心转子感应电机的转子阻抗参数计算是实心转子感应电机的难点。实心转子铁心材料非线性造成转子磁导率非恒定值,同时非线性导致了电磁场畸变,增加了转子阻抗的计算难度。对此,该文在双层转子模型子域解析的基础上,提出了一种考虑转子材料非线性,利用等效磁化曲线进行阻抗计算的方法,能够对非线性转子铁心在不同转差率下的磁导率进行计算,减小了由转子材料非线性造成的阻抗计算误差。通过二维时谐场有限元仿真验证了该方法的计算精度,并在该方法基础上提出一种考虑温度变化的转子阻抗简化计算方法,能够在转子温度变化情况下快速估算电机性能。This paper aims to establish the impedance calculation model of nonlinear copper-coated solid rotor induction motors.This model takes into account the magnetic field distortion caused by the non-linearity of the rotor core material.A method of impedance calculation based on an effective magnetization curve is proposed,which can calculate the permeability of the nonlinear rotor core at different slips and reduce the impedance calculation error caused by the non-linearity of the rotor material.Based on the effective magnetization curve,a simplified calculation method of rotor impedance considering temperature change is proposed to estimate the performance of the motor quickly.First,assuming that the magnetic permeability of the rotor core is a fixed value,the vector magnetic potential in the rotor surface domain is solved using the two-dimensional subdomain method of electromagnetic field on the copper-coated solid rotor model.Then,the analytical expression of the rotor core and the total impedance of the rotor is obtained.A method considering the nonlinearity of the rotor core material is proposed to calculate the magnetic permeability of the rotor core by equivalent magnetic field energy conservation from the original magnetization curve of nonlinear materials.The effective magnetization curve is obtained,and the permeability is calculated under different slips.The rotor core,rotor total impedance,electromagnetic torque,and power factor are calculated using the two-dimensional time-harmonic finite element method,effective magnetization curve analysis method,and original magnetization curve analysis method.The results show that the effective magnetization curve analysis method is more accurate than the original magnetization curve analysis method,especially at the stable operating point with a small slip.The resistivity and effective magnetization curve of the rotor copper layer and core at 200 are applied to℃the analytical method.A simplified calculation method is presented,which only changes the resistivity of

关 键 词：覆铜实心转子感应电机 转子阻抗 等效磁化曲线 转子材料非线性 

分 类 号：TM346[电气工程—电机]