Application of the transmission line theory to the frequency domain analysis of the motor voltage stress caused by PWM inverters

Abstract

The innovative contribution of this paper is the application of a frequency domain model based on the transmission line modeling techniques for a four conductor cable bundle without the assumption of lossless lines. A thorough documentation of the mathematical model is included. Laboratory measurements validate the model which predicts the peak motor terminal voltage caused by: 1) different motor cable sizes and geometry 2) variations of the inverter dv/dt 3) variations of the voltage step size applied to the cable 4) termination networks inserted at the motor terminals to control the dv/dt.