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

Abstract

A sin ple 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 rot.*.t with respect to variation of system parameters and load strnctrrre. 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. Nomenclature q-(d-)oxis stator current q-(d-)axis input stator voltage q-(d-)axis stator f 1112 rotor speed electromagnetic torque mechanical load torque ststor ( r o f o r ) resistance stator (rotor) inductance mtitual inductance nuniber of poles inertia of the rotor (LSL? -L:n)