摘 要本文是对直流电机 PWM 控制器设计的讨论，主要实现对电机的控制。本设计主要是实现 PWM 调速器的正转、反转、加速、减速、停止等操作。为实现系统的微机控制，在设计中，采纳了 AT89C51 单片机作为整个控制系统的控制电路的核心部分，配以各种显示、驱动模块，实现对电动机转速参数的显示和测量；由命令输入模块、光电隔离模块及 H 型驱动模块组成。采纳带中断的独立式键盘作为命令的输入，单片机在程序控制下，不断给光电隔离电路发送 PWM 波形，H 型驱动电路完成电机正反转控制.在设计中，采纳 PWM 调速方式，通过改变 PWM 的占空比从而改变电动机的电枢电压，进而实现对电动机的调速。设计的整个控制系统，在硬件结构上采纳了大量的集成电路模块，大大简化了硬件电路，提高了系统的稳定性和可靠性，使整个系统的性能得到提高。关键词：AT89C51 单片机；PWM 调速；正反转控制。AbstractThis article is a DC motor PWM speed control design study, the main achievement of motor control. This course is primarily designed to achieve PWM speed controller for forward and reverse, acceleration, deceleration, and stop such an operation. And to achieve the circuit simulation. To achieve system, microcomputer control, in the design, using AT89C51 microcontroller control system as a whole, the core of the control circuit, accompanied by a variety of shows, drive module enables the motor speed parameter display and measurement; from the command input module, Optical isolation module and H-drive module. With the stand-alone keyboard with a break as a command input, single-chip in the process control, continuing to the optical isolation circuit to send PWM waveform, H-type motor driving circuit to complete positive inversion control. In the design, using PWM speed mode, by changing the PWM duty cycle to change the motor armature voltage, so as to realize the speed of the motor. Design of the control system hardware structure with a large number of integrat...
