Transient and steady-state performance of a squirrel-cage induction motor

The paper gives a two-dimensional transient numerical analysis of a three-phase induction motor with a deep bar squirrel-case rotor under a voltage-forced operation. A combined explicit and implicit finite difference scheme is used to solve the problem. Regions of stator phase winding and rotor bar are solved by using a time-marching explicit scheme; the other regions of iron cores and air gap are solved together by the implicit scheme. The steady-state asymptotic solution of the electromagnetic field equation is calculated to simulate the motor operated at a constant rotor speed. The variations in torque, supplied current and rotor bar current, and their distributions with the rotor rotating speed, are obtained. Experimental work using a 1 h.p. squirrel-cage motor was carried out to verify the numerical results.<>