双向线盘式电磁斥力机构结构设计与磁场分析

Structural Design and Magnetic Field Analysis of Bidirectional Coil-plate Electromagnetic Repulsion Mechanism

高压直流断路器是柔性高压直流输电系统的关键部件,为了解决其机械开关中操动机构的多断口不同期性、驱动效率等问题,设计了双向斥力机构,能够充分利用驱动线圈上下两侧的磁场能量。首先,采用有限元仿真方法,通过对双向线盘式斥力机构和双向线圈式斥力机构的对比分析,优选出双向线盘式斥力机构;然后,对双向线盘式斥力机构几何参数进行分析;最后,为了进一步提高机构的驱动效率并控制分闸弹跳,分析了驱动线圈周围不同导磁结构及参数对运动特性的影响,设计了电磁缓冲器。结果表明:多断口机械开关采用双向线盘式斥力机构,实现了多断口单机构操动,简化了操动机构,提高了操动机构的驱动效率。

HVDC circuit breaker is a key component of a flexible HVDC transmission system.In order to solve the problems of different periodicities and low driving efficiencies of the multiple breaks of the operating mechanism in the mechanical switch,the bidirectional repulsion mechanism is designed,which may make full use of the magnetic field energy on the upper and lower sides of the driving coil.Firstly,by adopting the finite element simulation method,the bidirectional repulsive mechanism is preferably selected through the comparative analysis between the bidirectional coil-plate repulsive mechanism and the bidirectional coil-coil repulsive mechanism.Then,the geometric parameters of the bidirectional coil-plate repulsive mechanism of the repulsive mechanism are analyzed.Finally,in order to further improve the driving efficiency of the mechanism and control the bounce of the gate,the influence of different magnetic structures and parameters around the driving coil on the motion characteristics is analyzed,and the electromagnetic buffer is designed.The results show that the multi-break mechanical switch adopts a bidirectional coil-plate repulsive mechanism,which realizes the multi-break single-mechanism operation,simplifies the operating mechanism,and improves the driving efficiency of the operating mechanism.