3D temperature field analysis of the induction motors with broken bar fault

The paper deals with 3D temperature estimation for totally enclosed fan cooled (TEFC) induction motor with healthy rotor and faulty rotor. The losses are determined from a complex finite element analysis of the magnetic field, and based on the electromagnetism analysis, the 3D thermal models of the induction motor operating at the healthy state, one broken bar fault and two adjacent broken bars fault state are built. At the above three states, the steady stator-rotor coupled thermal fields of the motor with normal full load are calculated respectively. Then the influence of the broken bar number on the motor thermal field is analyzed. The accuracy of the model is assessed by comparing the calculated temperature values of the prototype motor with the measured ones at rated load condition.