Modeling of PWM Drive Motor System CM Noise Source

In this paper, The rectifier and inverter in three phase PWM drive motor system is studied. Based on Fourier Transform, Mathematical models of common mode noise source of rectifier are builded. A general modeling method for common mode noise source of inverters is presented based on the principle of the double Fourier integral. PWM carrier wave and fundamental wave function are described by two independence periodic time function. The action function by two variable combined is used to integrand of Double Fourier integral. The inner and outer integral limits with sine pulse width modulation are obtained. The proposed method carried out a PWM inverter-feed motor drive is verified by simulation and experiment results.