基于PC-PLC的變頻調速在攪拌系統中的應用

論文編號:ZD1287  論文字數:24857,頁數:42  附開題報告,實習報告，外文翻譯，大圖

摘要
 攪拌系統的核心是電機調速，現代的電機調速均以微電子器件作為控制器以電力電子功率變換裝置為執行機構，在自控理論的指導下完成電氣傳動，控制電動機的轉速，將電能轉換成機械能，實現工作機械的旋轉運動或反復運動。
 變頻調速具有高效率、寬范圍和高精度等特點，是運用最廣、最有發展前途的調速方式。交流電機變頻調速系統的種類很多，從50年代提出的電壓源型變頻器開始，相繼發展了電流源型、脈寬調制型等各種變頻器。目前變頻調速的主要方案有：交-交變頻調速，交-直-交變頻調速，同步電動機自控式變頻調速系統，正弦波脈寬調制(SPWM )，矢量控制、直接轉矩控制變頻調速等，本課題就是采用交-直-交變頻調速
 控制變頻器的方法現在呈多樣化的趨勢，其中PLC控制近幾年發展迅速。PC機可以很好的實現操作員對系統的控制，是人機結合的部分。通過PC與PLC之間的通信，可以達到隨時監控系統的目的，從而對系統出現的故障進行及時的排除，是理想的工業控制系統。

關鍵詞：PLC 變頻器，變頻調速，自動控制、運行監視、報警

Abstract:
 Mixing System is the core motor, Motor modern microelectronic devices are as a controller to power electronic power conversion systems for the implementation, In theory controlled under the guidance of electric drive and control the speed of motors, electrical energy into mechanical energy. achieving mechanical rotary movements or repeated movements.
 VVVF with high efficiency, wide range and high precision characteristics is the most widely used and most promising approach speed. VVVF many different types of systems, from the 1950s, the voltage source inverter, have developed a current source, pulse width modulation, and other inverter. Currently VVVF major programs : AC-AC Frequency Control, AC-DC-AC Frequency Control, Synchronous Motor VVVF-controlled system, sinusoidal pulse width modulation (SPWM), vector control, Direct Torque Control Frequency Control,
 Inverter control method now is the diversification trend, with PLC control the rapid development in recent years. PC machine can achieve a good operator of the system of control is part of the human-computer integration. Passed between PC and PLC communications, can be achieved at any time the purpose of monitoring system, so as to the fault system for the prompt exclusion, is the ideal industrial control systems.

Keywords：PLC Inverter，VVVF Automatic Control Surveillance operation Alarm

目錄從第二頁查看。