Abstract
In this paper, a novel rotor and stator resistances estimator has been proposed for detecting faults while they are still developing or adequate warning of imminent failure and to give minimum downtime and optimum maintenance schedules to apply in sensorless IM drives. The stator resistance estimation is applied for monitoring stator windings temperature and monitoring the status of stator windings insulation of induction motor. On the other hand, broken bars and end-rings are common faults in three-phase induction motors. A parallel model reference adaptive system (MRAS) has been proposed in order for simultaneous estimation of the stator and rotor resistances and rotor speed. The aim of the proposed MRAS is to save the cost of implementation and the processes time. The proposed parallel MRAS depends on the point of slowly variation of the rotor resistance with respect to the rotor speed.
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