Exponentially stable nonlinear field-oriented PI-controller for speed regulation of induction motor

A simple control law for speed regulation of induction motor is proposed in this paper. This controller is designed based on the concept of the field orientation and the property of linear PI-controller, and is shown to be robust with respect to variation of system parameters and load structure. In fact, the local exponential stability of the system around any desired speed can be proved by a simple iterative criterion derived in this paper. Numerical simulations are also given to show the effectiveness of the presented control law.