Digital implementation of fuzzy logic controller for wide range speed control of brushless DC motor

The brushless DC motors find wide applications such as in battery operated vehicles, wheel chairs, automotive fuel pumps, robotics, machine tools, aerospace and in many industrial applications due to their superior electrical and mechanical characteristics and its capability to operate in hazardous environment. Conventional controllers fail to yield desired performance in BLDC motor control systems due to the non-linearity arising out of variation in the system parameters and change in load. The main focus is now on the application of artificial intelligent techniques such as fuzzy logic to solve this problem. Another great challenge is to reduce the size and cost of the drive system without compromising the performance. In this paper, the design and digital implementation of fuzzy logic controller using a versatile ADUC812 microcontroller, and low-cost, compact, superior performance components are used in order to reduce the cost and size of the drive system. The experimental results are presented to prove the flexibility of the control scheme in real time.