Abstract
The subject of double-loop DC PWM speed control system, the main motor of the digital control. Therefore the design of the DC converter principle DC converter control and speed characteristics, PWM basic principles and ways for a full explanation.
To achieve the computer digital control, in terms of design, used 8051 as a whole control system of the control circuit core, and with all that driving, Measurement of modules to achieve the parameters of the motor speed display and measurement; rectifier circuit by circuit, the filter circuit, that the power conversion module components, the control circuit for a microcomputer core consists of current detection module, speed detection module, protection module. In the design, using PWM speed control mode by changing the duty cycle of the PWM thus changing the motor armature voltage, thereby realizing the right motor speed control. In order to improve the control system performance and reliability, and design, the current loop and speed loop PID regulator. In software, I used location PID control algorithm to achieve the right system PID tuning parameters, PID controller is the ratio of integrals, integral saturation correction factor, the parameters such as integration time, Due to reasons of space calculation unmanifested as if this thesis, it is in the final process directly give the value. Design of the entire control system, the hardware structure using a large number of IC module greatly simplifies the hardware circuit, improve the system's stability and reliability of the whole system performance is improved.
Keywords : 8051; PWM; DC converter system