基于FPGA交流电机变频调速系统.doc

中北大学2013届毕业设计说明书 基于FPGA的交流异步电动机变频调速系统 摘要 纵观生活各个领域，在变速这一方面，大多采用的是电动机的调速。直流电动机调速性能优越，平滑性好，在以前一直是调速应用中的主角。然而，直流电动机也有其固有的缺点：电刷易损坏，更换麻烦，运行不够稳定。于是人们希望用运行稳定，价格低廉的交流异步电动机来实现调速。随着电力电子技术的发展，用交流异步电动机来调速的愿望已经实现。其中尤以变频调速收到关注。变频调速性能优越，甚至可以与直流电动机的调速性能想媲美。 设计引入先进的FPGA，作为其核心控制芯片。FPGA是今年来逐渐崭露头角的集成电路，有其独特的优势：简洁、低成本、高速度、功耗小、全集成化、适应性强、便于开发维修等。系统同时采用SPWM专用芯片SA4828。SA4828是大规模集成电路，专门用来产生三相SPWM波形。 本文用FPGA控制SA4828产生三相SPWM波来控制逆变电路，从而实现对三相交流异步电动机的调速。 关键词：FPGA，SA4828波形发生器，三相交流异步电动机，变频调速 SPWM The Variable Frequency Speed Regulation System of AC Induction Motor Based on FPGA ABSTRACT Throughout Life in all areas, in terms of the variable speed, the motor speed is mostly used. For DC speed control performance is superior, smooth and good, and it has been the protagonist in the application of speed before. However, DC machines also has its inherent disadvantages: Flimsy brush, cumbersome replace, less stable operation. So people hope to use communication asynchronous motor ,which is more stable and cheaper, to realize speed. Along with the development of power and electronic technology, the desire of using AC induction motor speed has come true. Especially the frequency control receive is paid close attention. Frequency control performance is predominant which even can be compared favourably with the adjusting speed characteristic of DC Motor . The introduction of advanced FPGA and the central control chip is designed. FPGA is the up-and-coming integrated circuitry this year, it has unique advantages: simple, low cost, high speed, power consumption is small, monolithic integration, strong adaptability, facilitate development service and so on. System adopts the special chip SPWM SA4828. SA4828 is large scale integrated circuit dedicated to produce three-phase SPWM wave. This paper uses the FPGA to control SA4828 SPWM wave producing three-phase inverter circuits to control, so it can realize the three-phase ac induction motor speed. Keywords: FPGA，SA4828 Wave Generator，Three-phase AC induction mot