IE3 Induction Motor designs with Aluminum and Copper rotor cage: a comparison

The aim of this study was to design three-phase induction motors with Aluminum and Copper cage, in the range 0.7522 kW, to fulfill the IE3 efficiency level according to typical performance and standard constraints. The proposed study has concerned TEFC, 400 V, 50 Hz, S1 duty three phase squirrel-cage induction motors only, in the range 0.75-22 kW. The motors designs, with Al and Cu cage, have been optimized in order to reach the minimum efficiency level IE3 at lowest active material costs and satisfy the physical and performance constraints of the designs, that are the motor specifications. A suitable Optimization Procedure has been used that has allowed to find the “best design” by chancing the geometric dimensions of the stator and rotor shape, the stator winding and the stack length. In order to guarantee the goodness and feasibility of the optimized designs, several constrains have been imposed. The proposed procedure has allowed to optimize the 5 motor sizes to fulfill the IE3 efficiency level and to compare the optimized designs with Al and Cu rotor.