Research on Fuzzy Control System of Brushless DC Motor Based on DSP

Research on Fuzzy Control System of Brushless DC Motor Based on. Yan-hui Hui (College of Mechanical and Electrical Engineering, Guangdong University of Technology, Guangzhou 510090, China). Using the motion control interface of TMS320LF2407 to form a single DSP controlled motor system. A Hall element is used to detect the rotor pole position to form an electronic commutation logic. Speed ​​and current control are performed by PI, and position control is implemented by fuzzy logic. The selection of the domain of fuzzy variables and the method of variable domain control are discussed in this paper.

Finally, for the initial discourse domain (1, 5000, 5000), when the error is less than 2000, it changes to (1, 2000, 2000), and finally, when the error is small, the discourse domain becomes (a 100, 100). See the impact of this changing domain on system response. It should be noted that although the domain of change helps to improve the positioning accuracy and response speed of the system, when the steady state is reached, a small error will cause a new round of feedback control due to the small universe. Eliminate errors. Therefore, the steady-state oscillation frequency increases, especially if (c) has a (1, 5, 5) domain of discourse, the position output will fluctuate greatly along the steady-state value. Therefore, an overly small domain cannot be used.

Compared with traditional analog circuits, the cost is low, and the structure is simple and easy to expand. DSP's fast computing capability also enables more sophisticated control algorithms. Both the speed and current loops can be digitally implemented to form an all-digital brushless DC motor control system.

This paper uses DSP to realize the fuzzy control of the brushless DC motor.

The experiment shows that the position controller with fuzzy control has better positioning accuracy and rapid response ability than PID control, especially the fuzzy algorithm with changing domain can get better control performance.