The Control System Basing On AC Cage Induction Ajusts
Abstract
With the rapid development of the power electronics technology, computer technology, the automatic control technology, AC variable speed replace the DC Speed Control has become one of the main development direction of a modern electric drive. General-purpose inverters, as well as programmable logic controller for its superior speed regulation and the effective date of suspension performance, high efficiency, high power factor and a significant power-saving effect that widely used in large and medium-sized AC motor and so on, is recognized as the most promising Speed control . This topic is designed for the development direction of AC motor that based on PLC and inverter-based AC motor control system.
This article first introduced the general development of AC Drive System, the use of it’s area, as well as the domestic and abroad research of the DC Speed Control. As PROFIBUS is a result of the do not rely on manufacturer opening working site trunk standard, the equipment produced by different manufacturers does not need adjustments to its interface can communicate with each other, now it has been widely used in manufacturing, process and building automation, and considered to be the fastest working of today's working site trunk. Therefore, this paper based on the working principle and characteristics of the PROFIBUS trunk, discuss the situation of the MM series converter used in the system, and analyze the topology structure of PROFIBUS-DP network, the establishment of the main station and slave station in this system, guide of the inverter GSD documents, Program Designing of the PLC to the control of the inverter, MPI network settings, and finally gives the data format of control word (PQW), and status words (PIW)of the bus system. And ultimately to achieve the speed control of the AC motor through PLC and frequency converter.
Keywords The alternating current;PLC;the field bus of PROFIBUS;AC motor