【摘要】 开发了永磁机构动态分析软件,采用有限元法进行磁场计算,耦合机构运动和电路方程,仿真了机构及开关的动作特性并通过试验验证。提出了永磁机构中非工作气隙δ的概念,研究了δ,电容器容量,线圈参数以及供电方式对开关分合闸电流及速度的影响。本文从节能和缩小开关体积的观点出发,进行参数的优化选择。更多还原

【Abstract】 A set of software is developed for analyzing the dynamic behavior of permanent magnetic actuator, calculating magnetic field with finite element method and coupling with equations of the mechanical motion and circuit. The dynamic behavior of actuator is simulated and verified by the experimental results. The concept of none- working air gap δ is proposed. A research on the effects of δ,capacitor, coil and power supply on the switching current and velocity is carried out. The calculation result of this software is verified by the test result, the divergence of the average closing velocity is 4%. The non- working gap influences not only current of the starting operation of the circuit breaker but also the characteristic of switching speed of circuit breaker. The dimension of non- working gap can be optimized by the calculation of the dynamic characteristic of the permanent magnet mechanism. It can optimize the structure of the permanent magnet actuator and provide guidance for the engineering design. The parameters of the coil are also an important part in the designing of the permanent magnet mechanism, the stroke of the circuit breaker and the current of the coil are influenced by the diameter of the wire, number of turns and the resistance of the coil. From the view of saving power and reducing external dimensions, optimal parameters can be selected.更多还原