With the development of society and the progress of science and technology, small-scale DC motor is more and more widely used. The quality of DC motor control system directly affects the performance of the motor. In recent years, the control system of small DC motor has been paid more and more attention in our country. Some industries and designs need higher precision and dynamic response. In this design, the AT89C52 single chip computer of ATMEL company is used as the core, and Hall sensor, closed-loop feedback circuit and LCD1602 liquid crystal display circuit are added. The speed of the motor is detected by the sensor. The feedback speed is calculated by PID algorithm in the single chip computer, and the variable duty cycle pulse wave (PWM) is output to control the drive circuit, so as to stabilize the speed of the motor to the design The setting value, the speed of the motor can be set by pressing the key, and the liquid crystal display can display the current speed and the set speed of the motor in real time. This kind of DC motor control system based on MCU is not only simple and reliable in structure, but also easy to program and control, with very good speed regulation performance. Therefore, this kind of DC motor control system based on MCU is widely used in various fields.<br>
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