文档介绍：PLC与变频器结合实现电动机恒转矩控制
摘要
. 介绍PROFIBUS通信协议,以德国西门子公司MICROMASTER 440型变频器为例,介绍了PLC与变频器进行通信的硬件连接。依据该协议,实现了以PLC作为控制器,,并进行远程控制。
文中介绍了关于钢板的清洗工艺,以系统的实际应用来说明本系统的实际价值,调节刷辊的转矩来控制对钢板的刷洗力度。最后附以程序,有PLC和变频器的通讯的程序和PLC与变频器结合控制电动机恒转矩的PLC程序. 实践证明,该系统能有效地减少系统布线、提高系统的抗干扰能力,为恒转矩控制系统提供了一个低成本和高性能的方案。
关键词:PLC,变频器,PROFIBUS协议
bining With Frequency-converter Achieving Constant Torque Control Of Electric Motor
Abstract
This paper introduces a control system for instance posed of SIEMENS PLC and frequency-converter. The munication between PLC and frequency-converter is realized based on the PROFIBUS protocol. The PROFIBUS protocol is introduced in detail. Hardware link munication between PLC and frequency-converter are introduced with an example of SIEMENS frequency-converter MICROMASTER 440. According to this protocol, remote control of inverter is realized with SIEMENS PLC being controller under the environment of visual PLC. The presented system is very convenient to monitor the parameters of every frequency-converter on line and realize the distance control.
The paper introduced steel cleaning processes for the system to illustrate the practical application of the actual value of the system, Adjusting brush roller torque to control brush roller intensity on the skin of steel. At last, together with procedures, there munication procedures of PLC and frequency-converter and the procedures of bining with frequency-converter achieving constant torque control of electric motor. Practice has proved that the method can reduce electric connections and improve the anti-jamming capability of the system. Thereby a scheme for bining with frequency-converter to achieve constant torque control of electric motor with low-cost and high-performance is provided.
Keyword: PLC,frequency-converter,PROFIBUS protocol
目录
摘要 I
ABSTRACT II
1 绪论 1
选题的背景 1
PLC和变频器的发展 1
系统综述 2
2 三相异步电动机 4
异步电动