一种大功率永磁同步牵引电机失磁故障诊断方法

摘要

针对大功率永磁同步牵引电机存在失磁问题,提出了一种变参数条件下自适应滑模观测器方法.通过建立两相静止坐标系下永磁同步牵引电机失磁故障的数学模型,针对牵引电机实际运行过程中参数时变的实际,提出将自适应控制与滑模变结构控制相结合的方法,构建了自适应滑模观测器,以克服参数变化对失磁故障诊断造成的偏差.通过仿真验证了该方法的有效性和鲁棒性.%An adaptive sliding mode for demagnetization failure is presented under the condition of variable parameters for high power permanent magnet synchronous traction motor in this paper.After the establishing of a mathematical model for the demagnetization fault in the two-phase stationary reference frame,with regard to the problem of the changes of motor parameters,a method combining adaptive contrd with the sliding mode variable structure control is presented,and an adaptive sliding mode observer is designed,it can overcome the deviation caused by parameter variation.The simulation examples demonstrate the effectiveness and robustness of the proposed method.