开环变压调速的研究.doc

摘 要 交流异步电动机因为结构简单，体积小，重量较轻，价格便宜，维护方便等特点，在生产和生活中得到广泛的应用，与其他电机相比，交流异步电机的市场占有率始终居第一位。然而，长期以来，交流异步电动机的调速始终是一个不好解决的问题。直到二十世纪七十年代，由于计算机的产生，以及近二十年来新型快速的电力电子元件的产生，才使得交流异步电动机的调速技术近年来发展迅猛，并得到迅速得普及。目前，交流异步电动机得调速系统已经广泛应用于数控机床，风机，泵类，传送带，给料系统，空调器等设备得电力源和动力源，并起到了节省电能，提高设备自动化，提高产品质量和质量的良好效果。现在流行的异步电动机的调速方法可分为两种：变频调速和变压调速，其中异步电动机的变压调速应用较为简单，它的调速方法可分为三种：定子侧加自耦变压器、定子侧串饱和电抗器和用晶闸管调压器，后者的控制方法相对简单，且调速相对稳定。因此应用的比较多。在国外，交流调速技术已进入实用化阶段，在国内，虽然在实用化方面差距较大，但近年来发展很快，近期会出现一个推广近代交流调速的新热潮。 关键词：变压调速；异步电动机；晶闸管； Abstract AC induction motor as a simple structure, small size, light weight, cheap, easy maintenance, production and life in the wide range of applications, compared with other motors, AC induction motor has a market share of first place . However, a long time, AC induction motor speed control is always a bad problem.The twentieth century until the seventies, as the computer generation, and the last two decades the new, faster generation of power electronics components, which makes the AC induction motor speed control technology is developing rapidly in recent years, and have spread rapidly. Currently, the AC induction motor speed control system have been widely used in CNC machine tools, fans, pumps, conveyors, feed systems, air conditioners and other equipment have power sources and power sources, and played to save energy and improve the automation equipment, improve product quality and quality of good results.Now the popular method of induction motor speed control can be divided into two types: frequency conversion and transformer speed, swing speed asynchronous motor which is relatively simple applications, the speed control method which can be divided into three types: the stator side of Canada autotransformer, the stator side of the series saturable reactor and the thyristor voltage regulator, which is relatively simple control method, and the speed is relatively stable. Therefore, more applications. Overseas, the AC drive technology has entered the practical stage, in the country, alt