An Approach to Suppressing Both Shaft Voltage and Leakage Current in an AC Motor Driven by a Voltage-Source PWM Inverter
An Approach to Suppressing Both Shaft Voltage and Leakage Current in an AC Motor Driven by a Voltage-Source PWM Inverter
复制标题
电压源PWM逆变器驱动交流电机轴电压和漏电流的抑制方法
DOI：
10.1541/ieejias.123.1057
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发表时间：
2003
影响因子：
--
通讯作者：
H. Akagi
中科院分区：
文献类型：
--
作者：
T. Doumoto;H. Akagi
本文提出了一种实用的方法，以抑制轴电压和泄漏电流的交流电动机由电压型PWM逆变器驱动。这种方法的特点是使用交流电机的中性线。共模电感器连接在逆变器和电动机之间。此外，电阻器和电容器串联连接在电动机中性点和逆变器负直流母线之间。这种独特的电路配置使共模电感器能够有效降低出现在电机端子处的共模电压。结果，轴电压和接地电流都以低成本得到显著抑制。在电缆端部的过电压可以通过并联连接的正常模式电感器和电阻器来抑制。实验结果验证了该方法的正确性和有效性。
This paper proposes a practical approach to suppressing both shaft voltage and leakage current in an ac motor driven by a voltage-source PWM inverter. This approach is characterized by using a neutral line of the ac motor. A common-mode inductor is connected between the inverter and the motor. Moreover, a resistor and a capacitor are connected in series between the motor neutral point and the inverter negative dc bus. This unique circuit configuration makes the common-mode inductor effective in reducing the common-mode voltage appearing at the motor terminals. As a result, both shaft voltage and ground current are significantly suppressed with low cost. Over-voltages at the end of a cable can be suppressed by a normal-mode inductor and a resistor which are connected in parallel. The validity and effectiveness of the new approach are verified by experimental results from a 5-kVA laboratory system.