High order sliding mode observer and optimum integral backstepping control for sensorless IPMSM drive

This paper presents a robust high order sliding mode observer and an integral backstepping controller for a sensorless interior permanent magnet synchronous motor (IPMSM). In order to limit the chattering phenomenon on the observed state, a super twisting algorithm is combined with an interconnected observer to estimate the speed, the rotor position and the stator resistance. Moreover, a robust nonlinear control based on the backstepping algorithm is designed where an integral action is introduced. This controller allows to track a desired reference which is computed by using a maximum-torque-per-ampere strategy (MTPA). Simulation results are shown to illustrate the performance of the proposed scheme under parametric uncertainties and low speed.