In order to prevent chaos caused by parameter variation, the nonlinear characteristic of permanent magnet synchronousis discussed, the system model of PMSMis presented,and the stability of an equilibrium point is analyzed. Based on the nature of the equilibrium point, a controller is designed for PMSM control by linear feedback control theory, the chaos is eliminated, and the purpose of controlling PMSM is achieved. The theoretical analysis and numerical simulation results show the effectiveness of the line...