当没有电流流通时，电极之间的电压差驱动电子反方向流动。
When no electricity is delivered, a voltage difference between the electrodes drives a current in the other direction.
如果在两个接地点存在一个小的电势差，在系统的敏感部分就会有接地电流通过。
If a small potential difference exists between two ground points, some ground currents may flow through a sensitive part of the system.
由三相pwm逆变器产生的共模和差模电压可以在电机驱动中产生足够大的共模和差模电流。
The common and differential mode voltage produced by the PWM inverter can generate large common and differential current in the motor driving system.
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