Induction motor control by individual channel analysis and design

A novel control strategy for an induction motor is presented. It consists of a linear, diagonal, low order, minimum phase, robust, and stable multivariable controller (for the electrical subsystem); a Space Vector Pulse Width Modulated Voltage Source Inverter; a low order, minimum phase, robust, and stable SISO controller (for the mechanical component); and a reduced order observer for the rotor field angle estimation. The electrical subsystem control is achieved by the application of Individual Channel Analysis and Design. Robustness is proved through the analysis of the Multivariable Structure Function. The scheme has an adequate performance under the variations of rotor speed, load torque, and parameters –thus providing a simple alternative for Field– Oriented and/or Direct Torque Controlled induction motors