Bearing fault effect on induction motor stator current modeling based on torque variations

Incipient bearing fault detection and diagnosis in an induction motor are important for prevention of drive failures. Bearing fault leads to torque oscillations which results in phase modulation of stator current. Hence, the bearing fault can be detected by checking through the fault-related frequency at stator current spectrum. In this paper, the general model of the load torque oscillated by bearing fault is developed. A set of simulation results demonstrates the efficiency of the proposed generalization of load torque model.