Taking the stator winding of variable frequency motor as the research object, the effects of the frequency, peak value and rise time of the pulse width modulation (PWM) pulse wave output by converter on the transient voltage distribution characteristics of motor windings are analyzed. The results show that the increase of frequency has a direct impact on the motor loss, and then affects the voltage distribution through the loss. The increase of frequency and loss has a certain inhibitory effect on the amplitudes of voltage to ground and turn to turn voltage. With the increase of peak coefficient, the amplitude of voltage to ground of each coil increases, and the position of the maximum amplitude is transferred from near the neutral point to the motor end. The influence of the peak value on the turn to turn voltage distribution is relatively small. The variation range of the turn to turn voltage is 60~75 V, and the turn to turn voltage is evenly distributed under different peak coefficients. The rise time of the pulse has a great influence on the voltage distribution. With the decrease of the rise time of the pulse, the voltage to ground and turn to turn voltage increase linearly. Especially, the rise time has a decisive influence on the amplitude and the distribution uniformity of the turn to turn voltage.