THE INVESTIGATIONS AND 2-D COMPUTATIONS OF ELECTROMAGNETIC FIELDS AND FORCES DISTRIBUTION OF SQUIRREL CAGE INDUCTION MOTOR WITH BROKEN END RINGS

Abstract

In this paper an ABC transient model of the three phase induction motor is developed that depends on self and mutual inductance calculations based on accurate 2D finite element analysis (FEA). This model can represent both healthy and faulty motor conditions. The rotor broken end rings faults are studied thoroughly including their effects on the motor speed, motor torque, rotor bars and end ring currents distribution. Flux distribution and the forces exerted on the rotor bar are also studied. Broken end rings causes non-uniform distribution of the rotor bar currents which will lead to fluctuations in the motor torque and speed. Also it results in non-uniform radial forces affecting the bars which will increase the mechanical stresses on the rotor shaft and bearings.