文档介绍：------------------------------------------------------------------------------------------------ ——————————————————————————————————————基于 PWM 的直流电机控制系统设计摘要本文是对直流电机 PWM 调速器设计的研究, 主要实现对电机的控制。本课程设计主要是实现 PWM 调速器的正转、反转、加速、减速、停止等操作。并实现电路的仿真。为实现系统的微机控制, 在设计中, 采用了 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。采用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, 采用 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, 在硬件结构上采用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;仿真。 I Abstract This article isa 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 ------------------------------------------------------------------------------------------------ —————————————————————————————————————— achieve system, puter control, in the design, using AT89C51 microcontroller control system asa whole, the core of the control circuit, panied bya variety of shows, drive module enables the motor speed parameter display and measurement; from mand input module, Optical isolation module and H-drive module. With the stand-alone keyboard with a break mand input, single-chip in the process control, continuing to the optical isolation circuit to send PWM waveform, H-type motor driving circuit plete 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 integrated circuit modules, greatly simplifying the hardware circuitry to improve stability and reliability of the system so that the whole system performance is improved. Key words: AT89C51 microcontroller; PWM speed; positive inversion control; Sim