毕业设计( PLC和变频器控制交流电机的调速的发展与现状).doc

目录 摘 要 I Abstract II 1 绪论 1 1.1 PLC和变频器控制交流电机的调速的发展与现状 1 1.2 PLC和变频器控制交流调速的目的 2 2 PROFIBUS的通讯原理 3 2.1 RS485传输技术 3 3 变频器与可编程控制器 3 3.1 变频器原理介绍 3 3.2 交流电机的运行理论 4 3.3 可编程控制器 4 3.4 变频器 5 4 系统的设计 5 4.1 系统设计原理和方法 5 4.2 STEP软件简介 6 4.3 PLC程序设计 6 4.4 PI网络设置 7 5 结论 10 致 谢 12 参考文献 13 附录 程序 14 摘 要 随着电力电子技术、计算机技术、自动控制技术的迅速发展，交流调速取代直流调速和计算机数字控制技术取代模拟控制技术已成为发展趋势。电机交流变频调速技术是当今节电、改善工艺流程以提高产品质量和改善环境、推动技术进步的一种主要手段。变频调速以其优异的调速和起制动性能，高效率、高功率因数和节间效果广泛的适用范围及其它许多优点而被国内外公认为最有发展前途的调速方式采用PLC来控制变频器调速，充分发挥可编程控制器的高可靠性、灵活性、通用性、扩展性等优点，通过PLC的开关量输入输出模块控制变频器的多功能输入端、实现电机的多级调速，PROFIBUSP-DP通讯进而完成PLC控制变频器调速系统的方案设计和全部的控制系统设计PROFIBUSP-DP通讯 ABSTRACT With the power electronics technology，computer technology， the rapid development of automatic control technology，replace the DC-AC Drive Speed and computer numerical control technology to replace the analog control technology has become a trend。AC variable frequency motor speed control technology is the power to improve the process in order to improve product quality and improving the environment and promoting technological progress as a primary means。Frequency of its superior speed and braking performance from high-efficiency，high power factor and the effect of inter-section，a broad scope of application and many other advantages of being at home and abroad recognized as the most promising approach speed. In this paper, the study by AC motor speed control system using PLC to control the frequency converter speed control，programmable logic controller and give fullplay to the high reliability，flexibility,versatility，scalability，etc，through the PLC switches to control the volume of input and output modules multi-functional inverter input to achieve the multi-stage motor speed control，during the RS485 transmission technology through the establishment of the PLC and inverter PROFIBUSP-DP communication to complete the PLC control program inverter speed control system design and all of the control system design. Keywords: The alternating current