Design of a Novel Permanent Magnet Brushless DC Motor-Driven Operating Mechanism for High-Voltage Circuit Breaker and Its Dynamic Simulation

To improve the reliability of high-voltage circuit breakers,a novel operating mechanism,i.e.,a limited rotating angle permanent magnetic brushless DC motor-driven operating mechanism,is developed.According to the requirement to mechanical characteristic of 40.5 kV vacuum circuit breaker,the structure of the driving motor and its main parameters,including electric load,magnetic load,pole number,pole-arc coefficient and so on,are designed.The dynamic characteristic of the designed prototype is simulated by finite element method.Simulation results show that the design of the permanent magnetic brushless DC motor is reasonable,its mechanical characteristics,such as electromagnetic torque,current,rotating speed and rotating angle,etc.