关键词: 故障诊断, 滑模观测器, 混合逻辑动态模型, 电流残差法

Abstract: Aiming at the current detection problem of PMSM drive system after open circuit fault, an open circuit fault diagnosis method based on second-order sliding mode observer and mixed logic dynamic model was studied. By constructing second-order sliding mode observer and current model based on mixed logic dynamic model for PMSM drive system, the relationship between amplitude and phase of current residual vector under different open-circuit faults was deduced, and the location method and robustness of current residual vector to fault switch were analyzed in detail. Through the simulation analysis of three different fault states of the drive system, the validity of the current residual vector method for fault detection of the drive system was verified.

Key words: fault diagnosis, sliding mode observer, mixed logic dynamic model, residual current method