A novel method to calculate the thrust of linear induction motor based on instantaneous current value

摘要

Because of the end effect, a linear induction motor (LIM) runs in an asymmetrical state even though the winding of each phase is symmetric. Based on the basic principle of the LIM, a new approach was proposed to calcu-late the thrust of the LIM using the instantaneous current value. A three-phase LIM model with 12 slots and a single-layer winding was designed tovalidate this method. The experiments show that when the current is small, the calculated results basically agree with the experiments. The agreement becomes worse with the increase of the current because of the saturation of the primary iron core. The proposed formula is suitable when the iron core of the LIM primary is in an unsaturated state.