Control of a direct-drive DC motor by fuzzy logic

Abstract

The application of fuzzy logic theory to control a direct-drive DC motor in a robot arm is studied. The design of a fuzzy logic controller for position control of a single-link robot arm is presented. Simulation results show that the response of the fuzzy controller is very good, and it remains the same when the load mass changes in a wide range. The designed fuzzy controller has been implemented on an 8-bit microcontroller (68HC11) to evaluate the obtainable performance with a low-cost processor. Even with a relatively low sampling rate (66 Hz) due to the limited execution speed of the microcontroller, the fuzzy logic controller performs well in a wide range of operating conditions. Good experimental results were obtained, illustrating the high robustness of the controller to the load mass change.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>