Modeling and simulation of an electronically commutated permanent-magnet drive system using SPICE

The design of high-efficiency, electronically commutated, permanent magnet machine (ECPM) drives based on the finite element/difference method, and the solution of the ensuing differential equations with SPICE. The permanent magnet motor model includes the computation of load-dependent components of the motor equivalent circuit (e.g. induced voltages and inductances). A novel SPICE MOSFET model reflecting the reverse-recovery current phenomenon-which is very important for the design of variable speed drives operating in pulse-width-modulated (PWM) mode-is introduced. Results of this model are compared with measurements. Since ECPMs lend themselves well to vehicle propulsion due to their inherent high efficiencies at light weight, it is desirable to have a very high output-power-to-weight ratio for such applications