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- 저자 : Chuqiao Zhou (검색결과 1 건)
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Xiuping Wang,Jiawei Zhang,Chunyu Qu,Chuqiao Zhou 전력전자학회 2024 JOURNAL OF POWER ELECTRONICS Vol.24 No.2
Due to the narrow working space of an in-wheel motor, the heat generated by the motor loss is difficult to dissipate. This makes it easier for the in-wheel motor to demagnetize the permanent magnet due to the mega-temperature, which affects the output efficiency. To solve this problem, an external rotor hub motor is studied. First, in accordance with the theory of magnetic field modulation, the in-wheel motor to be studied is designed. By analyzing the electromagnetic characteristics of the motor, the correctness of the motor design is verified, and the losses of the motor under different working conditions are calculated. To acquire a more rigorous temperature increase record, the magnetic-thermal bidirectional coupling method is utilized to analyze the temperature field under different load conditions. The mechanism of the demagnetization of permanent magnets is analyzed, and demagnetization at different temperatures is obtained by magneto-thermal two-way coupling. Research shows that when the motor is overloaded for a long time, the temperature can reach a maximum of 220 °C. At this temperature, the permanent magnet undergoes irreversible demagnetization, which results in a 93.44% decrease in torque. Finally, temperature increase tests of a permanent magnet motor are carried out to verify the validity of the magneto-thermal two-way coupling analysis.
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