Modeling of eddy current loss in the magnets of permanent magnet machines for hybrid and electric vehicle traction applications

2009 IEEE Vehicle Power and Propulsion Conference Pub Date : 2009-10-20 DOI:10.1109/VPPC.2009.5289816

Xiaofeng Ding, C. Mi

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引用次数: 21

Abstract

The eddy current loss in the magnets of permanent magnet (PM) motors in a hybrid electric vehicle (HEV) and plugin HEV is usually not taken into consideration in traditional motor design and analysis. However, due to the high conductivity of the rare-earth magnet, neodymium-iron-boron (NdFeB), and slot/tooth harmonics, there is eddy current loss generated inside the magnets. This loss may not attribute very much to the efficiency of the motor, but the temperature-rise inside the magnets caused by this loss can lead to the unpredictable deterioration of the magnets. In addition, the output voltage of pulse-width-modulated (PWM) inverter contains abundant high frequency harmonics, which induce additional loss in the magnets. This paper presents the modeling and analysis of eddy current loss in surface-mounted-magnets of PM motors operated by PWM inverters for HEV/PHEV and electric vehicle traction applications. In order to evaluate the loss from pure sinusoidal and PWM inverter supply, an analytical method is implemented, in conjunction with time-stepped finite-element analysis (FEA). The simulation results validated the proposed model.

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混合动力和电动汽车牵引用永磁电机磁体涡流损耗建模

混合动力汽车(HEV)和插电式混合动力汽车(HEV)永磁电机的磁体涡流损耗在传统的电机设计和分析中通常没有考虑到。然而，由于稀土磁体钕铁硼(NdFeB)的高导电性和槽/齿谐波，磁体内部产生涡流损耗。这种损耗可能不太归因于电机的效率，但由这种损耗引起的磁体内部温度上升可能导致磁体不可预测的恶化。此外，脉宽调制(PWM)逆变器的输出电压中含有大量的高频谐波，这些高频谐波会在磁体中产生额外的损耗。本文对混合动力/插电式混合动力和电动汽车牵引用PWM逆变器驱动的永磁电机表面磁体的涡流损耗进行了建模和分析。为了评估纯正弦和PWM逆变器电源的损耗，结合时间步长有限元分析(FEA)实现了一种分析方法。仿真结果验证了该模型的有效性。

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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2009 IEEE Vehicle Power and Propulsion Conference

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