双闭环可逆直流脉宽调速H型PWM系统设计.doc

XXX大学本科毕业设计（论文） PAGE i 双闭环直流脉宽调速系统设计 摘 要 在电气时代的今天，电动机在工农业生产、人们日常生活中起着非常重要的作用。直流电机是比较常见的一种电机，在各领域中得到了非常广泛应用。直流电机调速问题一直是自动化领域非常重要的问题之一。采用传统的调速系统主要有以下缺陷：模拟电路非常容易随时间漂移，会产生一些不必要的热损耗，并且对噪声十分敏感等。 采用单片机构成的双闭环直流脉宽调速系统，其控制核心主要由触发、测速、双极性H型PWM变换电路、转速与电流控制器等组成。本文从直流调速系统原理出发，逐步建立了双闭环直流PWM调速系统的数学模型，用单片机硬件和软件发展的必威体育精装版成果，探讨一个将单片机和电力拖动控制相结合的新的控制方法，研究工作在对控制对象全面兼顾的基础上，重点对控制部分展开研究，它包括对实现控制所需要的硬件和软件的探讨，控制策略和控制算法的探讨等内容。 利用单片机实现对直流电动机的双闭环调速，此系统使直流电机具有优良的调速特性，调速方便，调速范围广，过载能力大，能承受频繁的冲击负载，制动和反转，能满足生产过程自动化系统的各种特殊运行要求。 关键词：双闭环，PWM，直流电动机 Design of DC PWM Speed Regulation System Based on Double Closed-loop Control Abstract In the age of electricity, electric motor plays a very important role in the industrial and agricultural production and peoples daily life. DC is a much more common form of motor and has been very widely used in various areas. DC motor’s speed mutilation is one very important issue in the automation. The traditional control system has the following shortcomings: analog circuit is very easy to drift over time and sensitive to noise, producing some unnecessary heat loss and so on. Double loop DC PWM speed control system formed by SCM is mainly made up of the circuit of trigger, the circuit of speed measurement, bipolar H-PWM conversion circuit, speed and current controller and other components. Based on the principle of the DC speed control system and we gradually establish a mathematical model of double-loop DC PWM speed control system. We use the latest results of single-chip microcomputer hardware and software to explore a new control method which combines the single-chip computer and electric drive control system. The research gives attention to both the comprehensive control object and focuses on the control section, which includes the hardware and software achieving control of system, control strategy and control algorithm and so on. Using single-chip microprocessor to achieve double-loop DC motor speed control, this system enables DC motor has excellent speed features, easy