Implementation of robust flux observer based field orientation (FOFO) controller for induction machines

The authors present a flux-observer-based field-orientation controller. The controller is centered about the flux observer, which performs the direct coordinate transformation without using any flux sensors. The advantage of this system is in the extremely low sensitivity of the generated torque to changes in machine parameters. The key is the desensitization of the flux observer, for which a variable pole allocation method for the flux observer is developed. A digital signal processor is used for actual implementation.<>