在三相逆变器驱动电机系统中，开关器件的PWM 波导致了轴电压和轴承电流的产生，使电机受到危害，降低了电机的使用寿命。
In the three-phase inverter-fed motor drives, the switching devices'PWM waves generate shaft voltage and bearing current, and these make the motor's life shorter.
轮毂单元设计成有内法兰和外法兰，内法兰用螺栓固定在驱动轴上，外法兰将整个轴承安装在一起。
Wheel hub unit is designed with an inner flange and the outer flange and the inner flange bolted on the driving shaft, the bearing outer flange mounted together.
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