Modeling of PWM drive motor system DM noise source

The rectifier and inverter in three phase PWM drive motor system is studied in this paper. Based on Fourier Transform, Mathematical models of differential mode noise source of rectifier are established. A general modeling method for differential 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 proposed method carried out a PWM inverter-feed motor drive is verified by simulation and experiment results.