1、 1 摘 要 可编程逻辑控制器（PLC）不仅在工业控制中应用越来越广泛，而且在其他 领域的应用也逐渐扩大，例如：电力、化工、能源、水利等。由于它的功能比较 强大、使用安全可靠、维护简单方便的优点，在很多地方已经取代了继电器电路 的逻辑控制。在对水中泥沙搅拌的处理过程中，需要速度控制比较稳定，而且能 够进行不同速度的操作；在拖动的处理过程中更加要求精确性。因此， PLC 控制 电机逐渐被人们运用到搅拌和拖动控制系统中。 本文讲述了基于 PLC 的电动机控制系统设计和实现过程。本系统将 PLC、 变频器、编码器、电动机、搅拌器、传感器有机地结合起来，组成一个简单完整 的自动控制系统。通过台达 WP
2、LSoft 软件平台编写程序并写入 PLC 后，控制电 动机实现多段速的运行。 在本文中还有一个值得介绍的就是高速计数的实现。 通过高速计数器可以对 拖动系统进行精确的控制，并且把计数值存放于固定的寄存器，以方便其他设备 完成对系统的操作和监控。 关键词：PLC 电动机 高速计数器 2 ABSTRACT Programmable Logic Controller (PLC), not only in the application of industrial control more and more widely, but in the application of other fields
3、 have also gradually expanded, such as: electric power, chemical, energy, water and so on.。 Because of its powerful features, the safety and reliability of use, easy to maintain , it has replaced the circuits logic control in many places. In the sediment of water mixing process,speed controling is m
4、ore stable, and it can be operated at different speeds; in the processing of dragging,it needs more reliability . Thus, PLC controlling motor is applied to mixing and dragging control system gradully. This article describes design and implementation process of the PLC-based motor controlling system
5、. PLC,Inverter, encoders, motors, mixers and sensors are combined to form a simple, complete automatic control system.Programs are designed and wrote into PLC through the software platform of Delta WPLSoft, then control multi-speed motor operation. In this paper the realization of high-speed countin
6、g is described valuablely. High-speed counter can control the dragging systems precisely, and keep the data in the fixed register in order to make other equipments operate and monitor the system convientely. Key words: PLC motor high-speed counter 3 目目 录录 第一章 绪论 1 11 题目来源及课题意义 1 12 文章概述 1 13 设计思路 2 第二章 电动机篇 . 3 21 电动机概述及分类 3 22 交流异步电动机 . 4 23 电动机变频调速 . 5 24 变频调速的控制原理 7 第三章 编码器篇 . 9 31 编码器杂谈 9 311 编码器的发展史 . 9 312 编码器的分类. 9 32 旋转编码器 10 321 旋转编码器的工作原理. 10 322 旋转编码器的分辨率和精
