关键词: 车辆工程；城轨列车；故障诊断；机电耦合系统；定子绕组短路；转子导条断条；电磁转矩

Abstract: Aiming at the problem that the electrical and mechanical parts of the motor gear transmission system of urban rail train were difficult to be coupled, resulting in their independent research, the nonlinear magnetic conductivity of the motor and the time-varying meshing stiffness of the gear were comprehensively considered, and the electromechanical coupling dynamic model of the traction transmission system of urban rail train based on permeance dynamic model (PNM) was established. Based on the proposed model, considering the short-circuit fault of stator turn winding and the fracture fault of squirrel cage rotor guide bar, the dynamic response of electromechanical coupling system under fault was obtained. The fault diagnosis was carried out on the basis of electromagnetic torque, and the diagnosis results were compared with those of vector control single motor model. The research results show that in the low frequency domain, the electromagnetic torque spectrum of PNM is larger at the fault frequency than that of vector control single motor model, and it is easier to identify the fault; in the high frequency domain, PNM electromagnetic torque diagnosis method can identify more obvious high-order harmonic components of power frequency, and has more advantages in fault diagnosis of electromechanical coupling system. The fault diagnosis method based on electromagnetic torque can effectively diagnose the faults of electromechanical coupling system of urban rail train, and provide theoretical support for fault detection technology without sensor.

Key words: vehicle engineering; urban rail train; fault diagnosis; electromechanical coupling system; stator winding short circuit; broken rotor bar; electromagnetic torque