DC Motor Speed Control System Based on PI Controller

Abstract

This paper designs a closed-loop DC motor drive speed control system based on PI regulator [1], which has the advantages of dead zone control, simple structure and high stability. The system main control is a MCU, with peripheral functions such as key input and liquid crystal display, and human-computer interaction is good. The H-bridge driver circuit adopts discrete component design, and adds IR2104 half-bridge driver with bootstrap circuit to realize control of MOS transistor. In addition, the logic circuit added in the circuit realizes one PWM signal to drive the motor, which reduces the requirement of the single chip microcomputer, and uses less single chip resources to achieve the same driving effect. The PI controller based on the op amp design allows the system to effectively track the speed and the speed can be stabilized to a given value.