A Passive EMI Filter for Eliminating Both Bearing Current and Ground Leakage Current From an Inverter-Driven Motor
A Passive EMI Filter for Eliminating Both Bearing Current and Ground Leakage Current From an Inverter-Driven Motor
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DOI：
10.1109/tpel.2006.880239
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发表时间：
2005-06
影响因子：
6.7
通讯作者：
Hirofumi Akagi;S. Tamura
中科院分区：
文献类型：
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作者：
Hirofumi Akagi;S. Tamura
本文提出了一种消除额定电压为400 V、功率为3.7 kW的逆变器驱动电机的轴承电流和对地泄漏电流的实用方法。当相对于电动机框架的轴电压超过驱动端和非驱动端处的两个金属轴承中的薄润滑脂膜的介电击穿电压时，放电加工（EDM）电流流过轴承。无源电磁干扰（EMI）滤波器可以消除电机端子的高频共模电压，从而保持轴电压处于受控状态。因此，润滑脂膜中不会发生介电击穿，因此轴承中没有EDM电流。实验结果验证了本文设计的无源EMI滤波器的可行性和有效性
This paper presents a practical approach to eliminating both bearing current and ground leakage current from an inverter-driven motor rated at 400 V and 3.7 kW. When the shaft voltage with respect to the motor frame exceeds the dielectric breakdown voltage of thin lubricating grease films in two metal bearings at the drive and non-drive ends, an electrical discharge machining (EDM) current flows through the bearings. A passive electromagnetic interference (EMI) filter can keep the shaft voltage in check, as a result of having eliminated high-frequency common-mode voltage from the motor terminals. Hence, no dielectric breakdown occurs in the grease films, so that no EDM current flows in the bearings. Experimental results verify the viability and effectiveness of the passive EMI filter designed in this paper