Dynamic Characteristics Calculation of Permanent Magnetic Swing Angle Torque Motor Based on Transient Finite Element Method

The finite element magnetic field numerical calculation method is widely used in motor structure design and performance analysis due to its high calculation accuracy and versatility. The permanent magnet swing angle torque motor is studied in this paper which applied to high voltage circuit breaker. Firstly, the topological structure and equivalent circuit equation of coupling circuit are discussed for the permanent magnet swing angle torque motor during the opening and closing, established the field-path-motion coupling time-step finite element model of motor, analyzed the distribution of magnetic flux, magnetic density and air gap magnetic density at the closing position, maximum load and opening position, and calculated the dynamic parameters of motor. The results show that the permanent magnet swing angle torque motor can meet the operating requirements of circuit breaker. In the magnetic field analysis, the magnetic density of stator yoke is 2.5T, the average air gap magnetic density is 1.0T. In the dynamic parameters simulation, the average opening speed is 656r/min, the opening operation time is 33ms, the closing operation time is 40ms. It can provide a theoretical basis for the further research and development of motor.