Influence of coil parameters on the voltage distribution in a machine stator winding fed by a PWM inverter

The present paper is dedicated to the evaluation of the influence played by important design parameters like the interturn insulation thickness and the insulating material permittivity on the voltage distribution among the coils of a stator winding fed by a PWM inverter. The system, composed of a feeder cable and a stator winding is modeled and simulated by using multiconductor transmission line theory. A recently developed time-domain equivalent circuit is used to represent the multiconductor line, with losses possibly dependent on frequency, which allows to correctly describe the dielectric losses and the skin-effect in the conductors. The obtained results can offer a broad guideline to design engineers for a suitable dimensioning of the motor insulation.