电动车用轮毂电机的负载磁场解析计算*

doi:10.19562/j.chinasae.qcgc.2020.12.007

Abstract

Abstract: To overcome the shortcomings of finite element analysis (FEA), i.e., tedious iterative modeling and time-and resource-consuming etc., a magnetic field analytical modeling method is proposed, concurrently considering both accuracy and efficiency.Taking a 48-slot/16-pole pair hub motor with surface-inset external rotor as study object, the loaded magnetic field analytical model of hub motor is established under a 2D polar coordinate system by using subdomain technique.The entire solution domain of the motor is divided into four types of subdomains, i.e., stator winding slots, slot openings, air gap and permanent magnet rotor slots, and the Laplace’s or Poisson’s equation of magnetic vector potential is solved in different subdomain according to different excitation source. Then, the boundary conditions between adjacent subdomains are used to solve the general solution of the magnetic vector potential in subdomain, and the electromagnetic performance such as magnetic field distribution, back electromotive force, inductance and torque are further calculated,and which with different slot opening structures are compared. FEA and prototype tests are conducted to validate the correctness of analytical models, and on this basis, the effects of polar arc coefficient and slot opening width on torque are further studied.The results show that with a polar arc coefficient of 0.825 and a slot opening angular width of 2.169°, the average output torque increases from original 160.75 N·m to 165.08 N·m, and the torque pulsation rate reduces from original 8.8% to 3.025%

Key words: hub motor, subdomain technique, analytical modeling, magnetic field distribution, torque

Zhang Heshan, Deng Zhaoxiang, Yang Minglei, Luo Jie, Xu Jin. Analytical Calculation of Loaded Magnetic Field in Hub Motor for Electric Vehicle[J].Automotive Engineering, 2020, 42(12): 1655-1664.

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Analytical Calculation of Loaded Magnetic Field in Hub Motor for Electric Vehicle

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