Control of induction motors via singular perturbation technique and nonlinear feedback control

A description is given of a design for controlling induction motors with high dynamic performance by decoupling control over rotor speed and motor flux. The singular perturbation technique and nonlinear feedback control technique are utilized. Three different decoupling control schemes based on rotor flux, stator flux and air-gap flux are developed. The proposed controllers consist of three subcontrollers: a saturation current controller, a nonlinear feedback controller, and a flux simulator. Simulation and experimental results are presented to verify that these control schemes provide decoupling control of rotor speed and motor flux with excellent dynamic behavior. A microprocessor-based drive system was implemented to demonstrate the decoupling control of induction motors