On-Line Detection of the Rotor Faults in the Induction Motor Drive Using Parameter Estimator

In the paper, a study on the broken rotor bars detection in squirrel-cage induction motor, using parameter estimation approach is presented. The broken rotor bars detection algorithm is based on the assumption, that the rotor faults may result in increase of the value of rotor resistance. In the proposed system the rotor resistance estimator, based on the model reference adaptive system is used. The additional rotor fault detection algorithm is presented, which is tested during rotor faults as well as thermal variations of rotor resistance. The induction motor is operating in the direct field-oriented control structure. Simulation results are presented, which are performed in the MATLAB/Simulink software. Proposed approach is also validated by experimental tests, which are carried out on laboratory setup, equipped with induction motor with physically damaged squirrel-cage and rapid prototyping system dSPACE 1103.