Optimal design of three phase induction motors and their comparison with atypical industrial motor

Three optimally designed three-phase squirrel-cage induction motors are com pared with an industrial (conventional) motor having the same ratings. The Hooke-Jeeves search routine is used for optimization and three objective fu nctions, namely efficiency, efficiency-cost and cost, are considered. Compa rison of the optimum designs with the initial and industrial design reveals that better than the proposed performance can be obtained by a simple opti mization method. It is interesting to note that the industrial design satis fies some performance of the cost optimum design, and efficiency optimum de sign, of course with a lower efficiency. The most desirable variation of mo tor performance with line voltage and output power is due to the efficiency optimum design. (C) 2000 Elsevier Science Ltd. All rights reserved.