In mill plants, the gear and rack are usually adopted as the pushing system of the three magnetism blocks of the pushing bed in magnetic force, The three magnetism blocks are out of step to start in the first twinkling of an eye in operation,that means driving single magnetism block instantaneously, It makes this magnetism block instantly overloaded, which will cause the rack to slip the tooth.

The variability of electromagnetic thrust during the process of the mover movement and the methods to stabilize the thrust were investigated.

In order to design a new linear operating mechanism with simpler structure,the electromagnetic thrust of double-slot single-phase capacitance linear induction motor(LIM) is studied in this paper.

Effect of constant current cource supply on the electromagnetic force of permanent magnet linear synchronous motor for vertical movement;