Accurate Demagnetization Analysis of Outer Rotor In-wheel Motor Under Braking Condition

Dongdong Jiang, Xiaoyan Huang, Yelong Yu, Zhaokai Li, Zixuan Liu
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Abstract

In this paper, considering the effect of iron saturation and motor drive system, a decoupling demagnetization analysis model is proposed to efficiently analyze the demagnetization of outer rotor in-wheel motor under braking condition. The accuracy of the proposed model is verified by the direct co-simulation model and the simulation speed is more than 100 times faster. Then, the max demagnetization ratio (MDR) and the average demagnetization ratio (ADR) of various current amplitudes and angles are evaluated explicitly to analyze the influence of different dq-axis current on demagnetization. It is found that both large current amplitude and demagnetizing magnet field will intensify the demagnetization level. The influence of PWM switching frequency, drive performance, motor speed and moment of inertia on demagnetization are analyzed. It is concluded that higher PWM switching frequency, smaller current amplitude overshoot and smaller demagnetizing magnet field in motor drive can effectively reduce demagnetization under braking condition.
制动状态下外转子轮内电机的精确消磁分析
考虑铁饱和和电机驱动系统的影响,提出了一种解耦消磁分析模型,有效地分析了制动工况下外转子轮内电机的消磁问题。通过直接联合仿真模型验证了该模型的准确性,仿真速度提高了100倍以上。然后明确计算了不同电流幅值和角度下的最大退磁比(MDR)和平均退磁比(ADR),分析了不同dq轴电流对退磁的影响。研究发现,较大的电流幅值和退磁磁场均会加剧磁体的退磁强度。分析了PWM开关频率、驱动性能、电机转速和转动惯量对消磁的影响。结果表明,提高PWM开关频率、减小电流幅值超调、减小电机驱动的退磁磁场,可以有效降低电机在制动工况下的退磁。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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