APPLICATION OF FUZZY-LOGIC IN THE SPEED CONTROL OF AC SERVO SYSTEM AND AN INTELLIGENT INVERTER

This paper presents a novel fuzzy logic controller for use in the full y digital speed control of ac servo systems. A new intelligent inverte r is also proposed to reduce the switching loss and the current harmon ics in induction motors. A 16-bit single-chip microprocessor is used t o reduce the number of circuit components for cost reduction and relia bility enhancement. In order to facilitate the instantaneous control o f motor torque, indirect field orientation is adopted along with a cur rent regulated pulse-width-modulation voltage-source inverter (CRPWM V SI). Computer simulation is first given to assess the feasibility of t he system proposed. Circuit design and software development are then u ndertaken. Simulation results are verified experimentally.