High performance speed and position tracking of induction motors using multi-layer fuzzy control

An electric drive system is considered high performance when the rotor position or shaft speed can be made to follow a preselected track at all times. The design of tracking controllers for induction motors is difficult due to motor nonlinearities and unknown load dynamics. An extension to fuzzy control, multi-layer fuzzy control (MLFC), is proposed and applied to high performance tracking of induction motors. The MLFC has two layers. The first layer is the execution layer which is made up of small subcontrollers. The second layer is the supervisor layer which fuzzily combines the execution layer subcontrollers to achieve the system objectives. The design and the tuning of the controller is simpler because of the layered topology. The MLFC tracking controllers are tested in the laboratory and their effectiveness in tracking applications is verified. The ease of controller tuning is also demonstrated.