With the advancement of science and technology, brushless DC motors are being widely used in the fields of national defense, aerospace, robotics, medical equipment, confidential machine tools and other fields. The research and application of motor control have also attracted increasing attention. Learning and mastering the simulation technology of brushless DC motor speed regulation is of great significance for future work and learning.
In this paper, a mathematical model of a brushless DC motor is established, and a double closed-loop speed regulation scheme is established. In Matlab, a double-closed loop speed regulation simulation model of a brushless DC motor is set up, in which the outer loop is a speed loop, using traditional PI control and fuzzy PI control modules, and the inner loop is a current PI control loop. The simulation results of PI and fuzzy PI speed regulation show that when the speed is adjusted from 1000r / min to 500r / min, the traditional PI speed is stabilized at 500r / min after 0.023s, and there is a large overshoot phenomenon, and the speed is the smallest during the adjustment. It is about 300r / min; while the fuzzy PID adjustment can be adjusted to 500r / min in only 0.004s, and there is no overshoot phenomenon. The fuzzy PI control speed regulation method is higher than the traditional PI control.
Keywords:brushless DC motor;PI control;fuzzy PI control