基于单片机的转差频率控制变频调速实验系统的设计.doc

摘 要 近年来，交流电机变频调速及其相关技术的研究己成为现代电气传动领域的一个重要课题，并且随着新的电力电子器件和微处理器的推出以及交流电机控制理论的发展，交流变频调速技术还将会取得更大进步。 转差频率控制的异步电动机变频调速系统是一项性能较好的控制策略，它几乎可以获得像直流电动机一样好的动、静态性能，且其结构也不复杂。故而转差频率控制的异步电动机变频调速已成为当前高校电传动电机拖动等课程的重要内容。因此，为了使学生加深对转差频率控制方法的理解，急需有一套性能良好的实验装置来辅助教学。而目前市场上出售的教学实验装置大多是采用模拟电路构成的，实验系统的性能由于受到零点漂移，温度等因素的影响而有所降低，不利于进行转差频率控制实验。 为了克服模拟实验装置的上述缺陷，同时考虑到减轻单片机负担，本论文在仔细分析转差频率控制原理、变频调速理论、逆变技术以及SPWM原理的基础上，利用AT89C51单片机、SA4828芯片、以及智能逆变模块IPM等为主要元器件，进而完成了基于单片机转差频率控制的变频调速实验系统的设计工作。 关键词：转差频率；AT89C51单片机；SA4828 芯片；正弦脉宽调制 Abstract Recently, the research of variable frequency speed variation of AC motor and relevant technology has become an important issue in electrical drive field, with the appearance of new power electronic apparatus and microprocessor and the development of the control theory, the technology of variable frequency speed variation will improve more rapidly. The slip frequency control of an asynchronous motor variable frequency speed regulating system is a good performance control strategy, because it can get almost the same static and dynamic performance as the DC motor. And its structure is also not complicated. Therefore, in the current university, The slip frequency control of asynchronous motor variable frequency speed regulating system has become the most important knowledge of the electric drive and motor drive courses. So in order to let the students to have a farther understanding of the slip frequency control method, a auxiliary teaching experimental device with a good performance is in greatly needed. While currently, the sale of teaching experimental device in the market mostly use analog circuit and the performance of the experimental device will be reduced due to the zero drift, temperature and other factors, so it is not good to conduct the slip frequency control experiment. In order to overcome the defects that described all above of the experimental device, at the same time, to loss the burden of the MCU, in this paper, a carefully analysis of the slip freq