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In this paper, a new control strategy is proposed which is simple in structure and has the straightforward goal of minimizing the stator current amplitude for a given load torque. It is shown that the resulting induction motor efficiency is reasonably close to optimal and that the approach is insensitive to variations in rotor resistance. Although the torque response is not as fast as in field-oriented control strategies, the response is reasonably fast. In fact, if the mechanical time constant is large relative to the rotor time constant, which is frequently the case, the sacrifice in dynamic performance is insignificant relative to FO strategies.

A new synchronous machine model is presented which is readily implemented in either circuit-based or differentialequation-based simulation programs. This model is well suited for the simulation and analysis of synchronous machine -converter systems. It is based upon standard representations and no approhations are made in its derivation. However, the numerical implementation is shown to be significantly more eEcient An example is provided which demonstrates a 1700% increase in si" lation speed with no observable lws i n accuracy. The model includes provisions for an arbitrary number of damper or rotor windings and may be easily modified to represent synchronous or induction machines with an arbitrary number of stator phases.