Based on the finite element model, simulated results on the flux distributions under different excitation A Ampere-turns and positions were obtained, discussion on the cause and characteristics of its stroke versus displacement were also given.

• 采用永久磁铁产生的极化磁场与线圈产生的控制磁场形成差动磁路作用于衔铁，使之实现双向驱动。