Adaptive fuzzy Backstepping control for speed of permanent magnet synchronous motor

An adaptive fuzzy controller based on backstepping was designed for speed tracking control system of permanent magnet synchronous motor(PMSM) with parameter uncertainties and load disturbance.The adaptive algorithm was used to estimate the load torque,viscous friction coefficient and inertia.The adaptive fuzzy system was applied to approximate the total uncertainty caused by fluctuating of stator resistance and inductance.And the stability of system was also proved through the lyapunov stability theory.The simulation was done for speed contol system of PMSM,and the simulation results show that this control method can more exactly track speed referance under parameter uncertainty and load disturbance compared with normal PI control.The system not only has good dynamic and static performance,but also strong robustness.