High performance, robust and universal fuzzy position controller for motor drives

A robust universal motor drive position fuzzy controller is proposed. Fuzzy rules are obtained only with experimental knowledge on motor drive dynamics. Thus without knowing any one of the motor parameters or operating conditions, a suitable lookup table makes this controller well suited to position control of most motors, from DC to synchronous types, and also enables a “quasi” robust behaviour. To eliminate the response steady state error and the usually limited boundaries in the input reference, an “elastic” controller is designed and implemented. As this “elastic” controller regulates the “gain” of the fuzzy controller, the system remains stable for all operating conditions and achieves fewer energy losses, when compared with a conventional fuzzy controller. Results are presented using DC and synchronous motors