单稳态永磁操动机构驱动线圈等效电感辨识方法研究

Study on Equivalent Inductance Identification Methods of Driving Coil in Monostable Permanent Magnet Actuator

永磁真空断路器运动过程中,驱动线圈电感具有非线性变化特点,给永磁真空断路器智能控制带来困难。在Maxwell上搭建实际单稳态永磁真空断路器操动机构的电磁模型,利用有限元法计算机构在分、合闸过程中线圈电流、电容电压等参数的变化情况并作分析;在Matlab上分别应用磁链电流法与微分方程法对分、合闸过程中线圈等效电感进行辨识;比较两种方法的辨识结果,验证两种方法在实现线圈等效电感辨识上的可行性与可靠性,为进一步的单稳态永磁真空断路器的智能控制研究打下基础。

The driving coil inductance changes nonlinearly with the movement of moving contact in closing angd separating trip of the permanent magnet vacuum circuit breaker, which makes it difficult for the intelligent control.The electromagnetic model of an actual monostable permanent magnet actuator was built by Maxwell software. The finite element method was used to calculate the driving coil current, the external storage capacitor voltage and other parameters in closing and separating trip. The equivalent inductance of driving coil was further identified by using the flux linkage-current method and the differential equation method. The calculation results of the two methods were compared,and two methods were verified feasible and reliable in realizing coil equivalent inductance identification, which lie the foundation for the further study of intelligent control of monostable permanent magnet actuator.