Modeling and Analysis of Loss and Temperature Field in Permanent Magnet Synchronous In-wheel Motor Based on Preisach Theory

doi:10.3901/JME.2019.22.033

Abstract

Abstract: In view of the problem that the obvious heating during the operation of permanent magnet synchronous in-wheel motor, which seriously affects the performance of permanent magnet and the life of motor The hysteresis characteristic test of motor core material was carried out to test the hysteresis loop under the condition of one-dimensional magnetization, and the influences of different magnetic field intensities and magnetic field high-frequency characteristics on the hysteresis characteristic were considered. Considering the classical Preisach theory fails to explain the phenomenon of high magnetic field frequency, based on the Symmetric minor loops (SML) density function of discretization method to set up the hysteresis characteristics of high frequency magnetic field intensity change model, compared with the results of prediction is found that the results are accurate, the magnetization characteristics under different frequencies have good simulation effect. Based on the analysis of the influencing factors of core loss, the spin exchange coefficient of core loss considering the influence of rotating magnetization and magnetic density harmonics is proposed to calculate the core loss. Finally, a three-dimensional temperature field model of the motor was established to simulate and calculate the temperature rise of each component and its danger points under different working conditions, and the temperature rise test of the motor prototype was carried out on the test bench to verify the comparison with the simulation results. Simulation results show that the maximum temperature of the motor is 73.2℃, and the maximum temperature of the test is 72.6℃, which proves the accuracy of motor loss calculation and temperature field simulation. The results show that considering the influence of magnetic field intensity and frequency on the magnetization characteristics of the core can effectively improve the defects in the electromagnetic calculation of the motor core and improve the accuracy of the prediction of the electromagnetic field, loss and temperature of the motor.

Key words: in-wheel motor, hysteresis characteristic, core loss, electromagnetic field, temperature field

CLC Number:

U463

ZHANG Lijun, XU Jie, MENG Dejian. Modeling and Analysis of Loss and Temperature Field in Permanent Magnet Synchronous In-wheel Motor Based on Preisach Theory[J]. Journal of Mechanical Engineering, 2019, 55(22): 33-40,51.

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