Fuzzy-logic-based speed control of a shunt DC motor

The fundamental equations governing the operation of a dc motor are straightforward and are well presented in most undergraduate curricula, usually in a required energy-conversion or electrical-machinery class at the junior level. The physical implications of the equations regarding device behavior, and the need for speed control, are easily understood. Furthermore, students can readily develop a mental picture of the physical motor and its response. Speed control of a dc motor represents an ideal application for introducing the concepts of fuzzy logic. Once the fundamentals of fuzzy logic have been presented to the students, their application to the speed-control problem can be easily demonstrated. The paper shows how a commercially available fuzzy logic development kit can be applied to the theoretical development of a fuzzy controller for motor speed, which represents a very practical class of engineering problems.