基于扩展磁链的永磁同步牵引电机失磁在线监测

On-line Demagnetization Detection of Permanent Magnet Synchronous Traction Motor Based on Extended Flux Linkage

针对内置式永磁同步牵引电机转矩闭环控制系统,提出一种基于最小阶扩展磁链滑模变结构观测器的永磁体失磁在线监测方法。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,以扩展磁链为状态变量,构建变速趋近律滑模状态观测器,实现了转矩和永磁体磁链的重构。该方法能够准确观测转矩和永磁体磁链信息,系统动态响应速度快,动态过程超调小,观测精度高,系统鲁棒性更强,可为提高永磁同步电机牵引传动系统的控制性能和可靠性实时提供准确的转矩反馈和转子磁链信息。基于RT-LAB搭建了硬件在环仿真试验系统,仿真和试验均验证了该方法的可行性和有效性。

An online permanent magnet demagnetization failures detection method based on a minimum order extended flux linkage sliding mode observer was presented for torque closed-loop control system of interior permanent magnet synchronous traction motor.After the establishment of a mathematical model in the two-phase stationary reference frame for the demagnetization fault,a variable rate reaching law sliding mode observer was built by using the extended flux linkage as state variables,to realize the reconstruction of torque and permanent magnet flux linkage.The estimation method can accurately track the torque and permanent magnet flux linkage,with a shorter transient time,smaller overshoot in the dynamic process of the system,higher observation precision and stronger system robustness,It can offer real-time accurate torque feedback and permanent magnet flux linkage information for the improvement of the control performance and reliability of the traction drive system of the permanent magnet synchronous motor.Then the RT-LAB real-time simulation was used to build the simulation model of hardware in the loop.The simulation and experimental results demonstrated the feasibility and effectiveness of the proposed method.