Adaptive backstepping based Controller design for Interior type PMSM using Maximum Torque Per Ampere Strategy

In this paper, a nonlinear adaptive backstepping controller is discussed for interior type permanent magnet synchronous motor (IPMSM) drive which is designed on the basis of maximum torque per ampere (MTPA) control strategy related to this motor. Using a general non-overparameterized adaptive backstepping procedure, it is proved that the system control variables are asymptotically stable. In addition, it is also shown that the estimation errors in the motor two axis inductances and rotor permanent magnet flux linkages, asymptotically converge to zero if the system persistency of excitation condition is also satisfied (PE). The PE condition is satisfied if the low amplitude low frequency AC signals are superimposed to the d-axes reference current (i_d*). Simulation results clearly show that the proposed adaptive control scheme can track the speed reference signal successfully, and that it can compensates all the electromechanical parameters variation so that no priori knowledge of real parameters is +required