基于单片机的直流电机调速系统设计毕业设计.doc

PAGE \* MERGEFORMAT PAGE \* MERGEFORMAT II 图书分类号： 密 级： 毕业设计(论文) 基于单片机的直流电机调速系统设计 Dc motor speed control system design based on single chip microcomputer 基于单片机的直流电机调速系统设计 摘要 本课题是对直流电机PWM调速器设计的研究，主要实现对电动机的控制。因此在设计中，对直流调速的原理，直流调速控制方式以及调速特性，PWM基本原理及实现方式进行了全面的阐述。 为实现系统的微机控制，在设计中，采用了AT89S52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，实现对电动机的转速的显示和测量；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，单片机在程序的控制下，不断给H型驱动电路发送PWM波形，使完成电机的正反转控制。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，大大的简化了硬件电路，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AT89S52单片机；PWM基本原理；H型驱动电路 Abstract This topic is on the research of the dc motor PWM speed controller design, the main implementation of the control of the motor so in the design, principle of dc speed control, dc speed control and speed control characteristic, the basic principle of PWM and implementation approach are comprehensively described. For the realization of the system of microcomputer control, in the design, adopted AT89S52 single chip microcomputer as the core part of the whole control circuit of the control system, match with all kinds of display, driver module, realize display and measurement of the rotational speed of the motor; By the command input module, photoelectric isolation module and H driver module.Adopt independent type keyboard with interruption as command input, monolithic integrated circuit under the control of the program, constantly send H drive circuit PWM waveform, the complete motor and reversing control in the design, using PWM speed control mode, by changing the PWM duty cycle to change the armature voltage of the motor, and then realize to the speed of the motor.On the design of the whole control system, the hardware structure by a large number of integrated circuit module, greatly simplify the hardware circuit, improve the stability and reliability of the system, improve the performance of the whole system Keywords AT89S52 single chip microcomputer Pulse Width Modulation B