EFFECTS OF CHOPPING ON CORE LOSSES AND INDUCTANCE PROFILES OF SRM DRIVES

A coupled Finite Element-State Space (CFE-SS) model of switched reluct ance motor (SRM) drive systems is used to evaluate the impact of chopp ing on the machine performance characteristics. The model is used to p redict the impact of chopping on the machine inductance profiles, arma ture currents, and core losses, The modeling environment utilizes an i terative approach which includes the full impact of nonlinearities on the machine magnetic circuit, that results in the nonsinusoidal nux de nsity waveforms in the different parts of the machine, The modeling ap proach is applied to a four phase SRM. Furthermore, the predicted resu lts are verified by comparison to experimental data.