A novel control scheme for double-sided long primary linear motor

In this paper, an advanced control scheme for long primary double-sided linear induction motor (DSLIM) is introduced. Equivalent circuit of DSLIM with shielding structure is established, which is very convenient for motor parameter determination and closed loop control. In order to improving the dynamic response performance, the armature field oriented control strategy with stator current feedback control and stator voltage feed-forward control is proposed. It chooses the armature´s position as outer loop of the whole control system. Position controller parameters are decided based on the kinetic equation of linear moving system. Meanwhile the armature´s acceleration profile is described and measurement of the armature´s position with quadrature encoder pulse is realized using the quadruple frequency circuit based on field programmable gate array (FPGA). Finally, both simulation and experimental results from laboratory test system confirms the effectiveness of the proposed control method.