1、 i 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巨大进步。 本文对变频调速理论，逆变技术，SPWM产生原理进行了研究，在此基础上设计了一 种新型数字化三相SPWM变频调速系统，以8051控制专用集成芯片 SA4828为控制核心， 采用IGBT作为主功率器件， 同时采用EXB840构成IGBT的驱动电路， 整流电路采用二极管， 可使功率因数接近1，并且只用一级可控的功率环节，电路结构比较简单。 本文在控制上采用恒 f V 控制，同时，软件程序使得参数的输
2、入和变频器运行方式 的改变极为方便，新型集成元件的采用也使得它的开发周期短。 另外，本文对SA4828三相SPWM波发生器的使用和编程进行了详细介绍，完成了整个 系统控制部分的软硬件设计。 关键字:变频调速，正弦脉宽调制， f V 控制，SA4828波形发生器 ii ABSTRACT Recently, the research of variable frequency speed variation of AC motor and relevant technology has become an important issue in electrical drive field, wit
3、h the appearance of new power electron apparatus and microprocessor and the development of the control theory, the technology of variable frequency speed variation will improve more rapidly. This thesis has a research on these technologies: Variable Voltage Variable Frequency motor drive, inverter,
4、and the creation principle of SPWM, Based on the results of the study, I designed a system of a new digital three phases VVVF motor drive system. It uses ASIC-SA4828 controlled by 8051 as main controlling core, it uses IGBT as power device, and uses EXB840 as drive. It uses diodes as converting circuit unit, which makes power factor close to 1. Because I only need to control inverter, the whole circuit is very simple. I adopt the means of linear f V operation. At the same time, it is very conve
