Abstract
With the intensive research of frequency control of motor speed system in recent decades, and the deepening of the research technique of frequency control of motor speed system in industrial application, the promotion of the inverter application prospects become width and depth. From this frequency control of motor speed system’s basal knowledge, this paper expounds the background of frequency conversion and development prospect, and on this basis, to PF9833 three-phase of special tester PWM experiment equipment , through programming, equipment and computer communication links, then collecting and analysing the experimental system of frequency control of motor speed’s characteristic parameter.This paper introduces in detail the text of the experimental apparatus using C language performance and achieve RS232 serial communication. Introduce RS232 serial communication, research using the way of the C programming language realization process of serial communication RS232. Finally introduces the principle and PWM inverter technology, as well as a detailed describes the development of variable frequency speed regulation system present situation and prospect.
Keywords：frequency control of motor speed、PF9833、C language、RS232 interface、PWM technique
