Study on Simulation of Asynchronous Motor Rotor Broken Bar Fault

Rotor broken strip of asynchronous motor is not obvious and usually cannot be judged accurately because of on-site noise, equipment installation and other various interferences. In this paper, a simulation of rotor broken bar fault is conducted in SIMULINK environment, and the motor fault is simulated by changing the external resistance of the wound asynchronous motor. Through simulation and analysis of various combinations of several external resistors, the variation law of stator current frequency under varying fault degree is revealed. This model is feasible and can simulate different degrees of broken bar fault in order to approximate various working conditions. The simulation results show that the spectrum analysis method can be effectively applied to the diagnosis of motor rotor broken bar fault, and the correctness of the simulation model is verified.