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首页> 外文期刊>IEEE Transactions on Industry Applications >Modeling of motor bearing currents in PWM inverter drives
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Modeling of motor bearing currents in PWM inverter drives

机译：PWM变频器驱动器中电机轴承电流的建模

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摘要

Pulse-width modulated (PWM) inverters have recently been found to be a major cause of motor bearing failures in inverter-fed motor drive systems. Specifically, all inverters generate common-mode voltages relative to the earth ground. These voltages provide coupling or bearing currents through motor parasitic capacitances to the rotor iron which flow via the bearings to the grounded stator case. In this paper, a model of bearing currents caused by PWM inverters is proposed. The model is based on transmission line theory which uses an equivalent lumped parameter /spl pi/-network to describe the parasitic coupling phenomenon. The model parameters are then identified by matching the calculated model outputs with those of experimental measurement. The validation of the method is demonstrated by the fact that the model can reproduce a variety of experimental results obtained on a test motor. An application of this method also gives a motor grounding current model. As the conducted electromagnetic interference (EMI) in motor drive systems is related to the grounding currents, the grounding current model can be used for the analysis of conducted EMI in motor-drive systems.
机译：最近发现，脉宽调制（PWM）逆变器是逆变器供电的电机驱动系统中电机轴承故障的主要原因。具体而言，所有逆变器均会产生相对于大地的共模电压。这些电压通过电动机的寄生电容提供给转子铁的耦合或轴承电流，该电流通过轴承流向接地的定子壳体。本文提出了PWM逆变器引起的轴承电流模型。该模型基于传输线理论，该理论使用等效的集总参数/ spl pi /-网络来描述寄生耦合现象。然后，通过将计算出的模型输出与实验测量结果进行匹配来识别模型参数。该模型可以重现在测试电动机上获得的各种实验结果，从而证明了该方法的有效性。该方法的应用还给出了电动机接地电流模型。由于电动机驱动系统中的传导电磁干扰（EMI）与接地电流有关，因此接地电流模型可用于分析电动机驱动系统中的传导EMI。

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