Model reference adaptive backstepping based direct torque control of PM synchronous motor drives

The paper describes an investigation of model reference adaptive backstepping based direct torque control (DTC) for permanent magnet synchronous motor (PMSM) drives. The analysis of PMSMs drive model provide the basis for the designing the controller using the adaptive backstepping technique. A linear reference model is introduced in order to achieve high performance speed tracking. The proposed controller is robust to the uncertainties and load torque disturbance. It is proven that the control variables are globally asymptotically stable by applying Lyapunov theory. The performance of the proposed drive is investigated in simulation at different operating conditions. It is also demonstrated that the new system has a much better speed tracking performance while keeping a good dynamic performance, even for large uncertainties and disturbances.