为了改善电气控制系统性能，设计了适用于片状无轴承永磁电机的双向三电平PWM功率放大器和控制箱转接板。
To improve the capability of the electric system, a three-level PWM power amplifier and Backboard of the control-box is designed, which are applicable to the bearing-less slice PM motor.
进给传动：三向进给均采用交流伺服电机驱动精密滚珠丝杆，专用丝杆轴承支承，提高了机床的进给运动刚性和精度。
Feed transmission: using AC servo motor to drive the precise ball screw sets that supported by special ball screw bearing, which improves the rigidity and precision of feed movement.
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.
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