FINITE ELEMENT CALCULATION OF DOUBLE-CAGE SKIN FACTORS

Abstract

Resistance and inductance skin factors for a double-cage induction motor are calculated as the ratio of AC and DC values in the 0-70Hz rotor frequency range by the help of a finite element analysis software. In this way, the parameters of a complete or correct equivalent circuit are determined which allows for the skin-effect in the outer and inner bars themselves. Results of calculation from the correct and the generally used approximate equivalent circuit are compared. If finite element analysis is available, the use of the correct equivalent circuit is proposed.