Thermal behavior for induction motor using DC signal injection method by Matlab® Simulation

This paper proposes a new technique to model the stator winding of the induction motor in order to simulate its thermal behavior. The modified model is used to validate a remote and sensorless stator winding temperature estimation technique for induction motors. The stator winding resistance/temperature is estimated from dc injection via soft starter by changing the gate drive signals of the thyristors. The thermal behavior is simulated utilizing a thermal resistor block from Matlab Simscape™ software to replace the fixed resistor value in software induction motor model in the Matlab Simulink^®. The thermal monitoring scheme has been validated from the simulation results of a 10-hp induction motor under various load conditions.