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In order to reduce the loss caused by the failure of large motors, it is of great significance to accurately detect and predict the state of the motor during operation. Based on the theory of motor asymmetry, combined with the influence of temperature on the winding resistance in the actual operation of the motor, with the help of ANSYS finite element analysis software, a simulation model of a large three-phase asynchronous motor with double Y windings is established. This article uses the Maxwell circuit editor module to build an external circuit. First, verify the abnormal characteristics of the three-phase current when the phase is missing through simulation, and then analyze the influence of the resistance asymmetry on the motor operating characteristics. The simulation results show that the abnormality of the three-phase current caused by the winding asymmetry is regularly and cyclically amplified, that is, in the actual motor operation, the first phase of the abnormal winding can be determined by real-time observation of the three-phase current. In this way, we can avoid the burning of the motor.