电机驱动系统电机端共模电压的研究

Research on Conducted Common-mode Voltage in Motor Side of Motor Drive System

这里在详细推导功率变换器直流侧与交流侧共模电压表达式基础上,研究了三相两电平PWM电机驱动系统电机侧共模电压的时域特性、频域特性,及功率变换器与电机之间存在长电缆连接时电机终端共模电压的变化情况。在基于Saber软件对PWM电机驱动系统进行仿真的同时,还通过实验对所给出结论的正确性进行了验证。

The time-domain and frequency-domain charater of commom-mode voltage in three-phase two level PWM- driven motor system is analyzed based on the detailed deduction of common-mode voltage expression in DC side and AC side.And the changes of common-mode voltage in motor side when using long cable between converter and motor is analyzed also.Theoretical predictions are verified by using simulation with Saber soft,and conclusions are proved with experimental tests.