A SPICE model for a novel brushless adjustable-speed drive

A SPICE circuit model was developed to accurately simulate the i-v characte ristics of a brushless ac motor commutated by semiconductor switches. The m odel is based on Fourier curve fits to measured mutual inductance interacti ons between all combinations of field and armature windings, as well as coi l resistance and inductance. The model is able to accurately predict curren t and voltage characteristics, both statically, and dynamically when interf aced with a commutation model. The model has been demonstrated to agree wit h electrical tests of an inverted motor on a large time scale. It has also given reliable predictions of small time-scale details, where it is desirab le to predict power MOSFET switch behavior after a command to open or close . Data were collected and analyzed for simulations of the motor model combi ned with a commutation model containing MOSFET switches. Metrics were compa red to data collected from an inverted brushless motor with good agreement.