Effect of parameter variations on induction-motor transients

Previous work on the transient performance of induction motors has paid little attention to the effect of variations in winding parameters from some assumed stator/rotor allocation. This paper shows that, based on factorialdesign considerations, a response equation may be derived that expresses the severity of the transient current or torque, or the runup time, in terms of a nominal response, together with contributions derived from the parameter variations. The coefficients of the response expressions for the transients that follow several switching and reswitching operations of a 5.6 kW motor are given. The errors introduced by the use of a fractional factorialdesign plan are shown to be small, and mention is made of typical situations in which the technique described may be useful.