Determining the equivalent circuit parameters of canned solid-rotor induction motors

Abstract

For designing canned solid-rotor induction motors, the conventional induction motor circuit is inadequate. Here we present an alternative equivalent circuit, one that reflects the eddy currents in all regions (cans and rotor body). The proposed model operates on a per-phase basis at a single frequency. We confirm the validity of the new equivalent circuit with numerical and analytical solutions. This analysis has shown that the classical equivalent circuit for conventional induction motors is not sufficient to obtain the circuit parameters for the canned solid rotor induction motors. We also consider certain assumptions that make the analytical approach simpler.