Design on PID Control System of DC Motor Based on MC9S08AW32

摘要

At present, the development of artificial intelligence control method is more and more rapid. The control effect is more and more accurate, but at the same time, its control method becomes gradually complicated. The processor requirements are also getting higher and higher. A lot of intelligent control algorithms are difficult to be used in the micro control units with small memory capacity and weak computational ability. In the car-door-lock industry, the noise of the car-door-lock during the unlocking process draws more attention from the customers. The car-door-lock manufacturers also want to control the speed of the unlocking motor in the car door unlocking process through a motor control system. And they hope to know the effects of the different motor speed on the noise and the internal structure of door lock during unlocking process. Therefore, the design process of motor control system based on Freescale chip MC9S08AW32 as the main chip is introduced in the paper. It mainly includes the design of the hardware circuit, the software design of PID control algorithm and the design of the communication between the main chip and LCD12864 which is used for display. The designed motor control system can always output a stable motor speed regardless of the external load change.