Efficient dynamic models for induction machines

A computationally efficient reluctance mesh model suitable for simulating t he dynamic performance of practical induction motors is presented. The calc ulation time is minimized by direct computation of rate of change of flux, avoiding unnecessary evaluation of time and rotor position dependent induct ances. The magnetic, electrical and dynamic models of the machine are coupl ed so that the simulation determines both steady state and transient behavi our including the effects of saturation and high order torque harmonics due to the rotor and stator teeth. The algorithm is developed from rigorous fi eld theory. This is combined with and simplified by, practical experience, resulting in a procedure that can efficiently simulate 3D machines within a n iterative design environment without requiring extensive computational re sources. Full details of the implementation are presented along with simula tions and experimental characterization of a practical induction motor whic h are found to be in 'excellent' agreement. (C) 1999 John Wiley & Sons, Ltd .