Bar-Wound Machine Voltage Stress: a Method for 2D FE Modeling and Testing

Brennan Kelly, Julia Zhang, Luke Chen
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引用次数: 3

Abstract

Advancements in semiconductor technology present new challenges in electric machine construction, operation and control. Silicon carbide (SiC)-based power electronics are becoming the new standard for high-power consumer and commercial devices, and are implemented in technologies such as power inverters, converters and rectifiers. This paper focuses on the effects of inverter drives for traction motors in electric vehicles with high dV/dt rates on bar-wound machine windings, including the expected impacts on insulation materials under prolonged periods of high voltage stress. A simulation model was constructed using finite element analysis, the results of which were validated with experimental results using a commercially available SiC inverter and traction motor. The results presented in the analysis pertain mostly to a single phase of a three-phase IPMSM in order to reduce simulation and testing complexity and runtime, so that the accuracy of the simulation in relation to the physical model can be demonstrated before proceeding to three-phase analysis. Some three-phase testing and analysis is also included. Correlation has been established between the preliminary simulation results and experimental data. It is proven that as DC bus voltages increase with the capabilities of SiC devices, the voltage stresses inside the stator windings approach levels which could cause partial discharge and premature insulation degradation in existing stator designs.
棒绕机电压应力:一种二维有限元建模与测试方法
半导体技术的进步对电机的结构、操作和控制提出了新的挑战。基于碳化硅(SiC)的电力电子器件正在成为大功率消费和商用设备的新标准,并在功率逆变器、变流器和整流器等技术中得到实现。本文重点研究了高dV/dt率电动汽车牵引电机变频器对条形绕组的影响,包括在长时间高压应力下对绝缘材料的预期影响。采用有限元方法建立了仿真模型,并与市售SiC逆变器和牵引电机的实验结果进行了验证。为了减少模拟和测试的复杂性和运行时间,在分析中提供的结果主要适用于三相IPMSM的单相,以便在进行三相分析之前可以证明与物理模型相关的模拟的准确性。还包括一些三相测试和分析。初步模拟结果与实验数据建立了相关性。事实证明,随着SiC器件性能的提高,直流母线电压增加,定子绕组内的电压应力接近可能导致现有定子设计中的局部放电和过早绝缘退化的水平。
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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