Dynamic characteristics of the permanent magnetic actuator of vacuum circuit breaker based on the optimization of parameters of the coil transient current
SHENG Yicheng1, LIU Jiangang2, GUO Yu3, WANG Zeze3, JIN Lijun3
（1.College of electronics and information, Sichuan University, Chengdu 610065 China; 2.Ningbo Yaohua Electric Factory, Ningbo 315324 China; 3.School of electronics and information engineering, Tongji University, Shanghai 201804 China）

Abstract: To solve the problem of lacking of output, difficult matching action characteristics with vacuum circuit breaker interrupting performance of permanent magnetic actuator, single coil permanent magnetic actuator was studied in. The magnetic flux distribution was analyzed based on divided permanent magnetic mechanism section and 3D electromagnetic field mathematics model was established. Using the finite element simulation method, dynamic relationship between coil transient current and the core switching operation characteristics was solved. The permanent magnetic actuator structure stored to capacitance, the voltage of the power supplied, the number of turns of the coil and load equivalent quality and other main parameters influence operating characteristic was explored. Research results indicate that the simulation data and the experimental data reach agreement.Optimized capacitor, coil and load parameters of permanent magnetic operating mechanism provide a theoretical basis for the displacement detection, system fault diagnosis and structural improvement.
Key words: permanent magnetic actuator; transient current; magnetic circuit; action characteristics