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机械毕业设计 论文

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LW01-038@变频器调速系统的研究与应用,机械毕业设计 论文

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摘 要变频调速具有高效率、宽范围和高精度等特点，是目前运用最广泛且最有发展前途的调速方式。交流电动机变频调速系统的种类很多，从早期提出的电压源型变频器开始，相继发展了电流源型，脉宽调制等各种变频器。目前变频调速的主要方案有:交-交变频调速，交-直-交变频调速，同步电动机自控式变频调速，正弦波脉宽调制(SPWM)变频调速，矢量控制变频调速等。这些变频调速技术的发展很大程度上依赖于大功率半导体器件的制造水平。随着电力电子技术的发展，特别是可关断晶闹管GT0，电力晶体管GTR，绝缘门极晶体管IGBT，MOS晶闸管及MT 等具有自关断 力 控功率 件的发展， 上控制 从 件发展 大 电 及 用 机控制，从 变频 的 速 ，可 及 断提高，变频调速系统的 断 。变频调速器的电压方案，及currency1运“高波的fi和fl制和变频调速系统的 用关键词：变频调速波变频器ntsAbstractThe characteristic of Frequency conversion adjustment of speed is the high efficiency, the width scope and the high accuracy and so on. At present, it obtains the widespread utilization, and is most has the development future the velocity modulation way。Exchange motor system type of Frequency conversion adjustment of speed has very much. It begins from the type of voltage source, then the source type of electric current comes out, following closely, the pulse width and other various kinds of frequency converters is emerged. At present ,the main scheme of Frequency conversion adjustment of speed is as follows, Hands over - the alternation Frequency conversion adjustment of speed, hands over - the straight - alternation Frequency conversion adjustment of speed, the synchronous motor automatic control Frequency conversion adjustment of speed, the sine wave pulse-duration modulation (SPWM) the Frequency conversion adjustment of speed, the vector control Frequency conversion adjustment of speed and so on. In these technical development very great degrees relies on the high efficiency semiconductor device manufacture level. Along with the electric power electronic technology development, specially the development of something that may shut off the crystal noisily to manage GT0, electric power transistor GTR, insulation gate extremely transistor IGBT, the MOS crystal thyratron and MTC and others that have the ability to control the power part. In addition control unit also develops from the separative element to the large-scale digital integrated circuit and uses the microcomputer control, thus causes the frequency conversion equipment the rapidity, the reliability and the efficiency unceasingly enhances, the Frequency conversion adjustment of speed system performance also obtains the unceasing consummation. This article is in view of velometer voltage choice plan of Frequency conversion adjustment of speed, as well as the higher harmonic production and the suppression question, and gives an example for the use of the