The thesis is based on the project responded by writer. The project is come from schedule of The Committee of Science and Technology of Hebei Province. In the thesis, current situation of AC motor speed controlling technology of our country and the world has been discussed. The designed AC inverter system has also been discussed in details about the whole construction and each section. Meanwhile reliability design method was introduced to whole the system. After the reliability index of each section had been distributed, analysis of every section in quantity was made. Thus the weakest part was located and improved; the reliability of whole system was also improved. In progress of system researching and manufacturing, new types of technology and parts were used as far as possible. In the inner current loop, specially designed SPWM integrated circuit has been developed the first time in our country. This circuit combined with single chip macro-processor and high speed AD part constructs a specially used current loop system. The system has the characteristics of being commonly used, being reliable and convenient. The fuzzy controlling theory and vary construction controlling method has been used in speed loop. The method above is advanced, robust and simple in construction. Better controlling results have been gotten. Photoelectricity isolated driving circuit has been designed by our selves which has the characteristics of simple construction and being reliable. Advanced Intelligent-Power- Modules(IPM) has been used in main power circuit. All the system has constructed as modules and greatly simplifies the problem of manufacturing, installing, testing and maintaining. After the device was made, the performance of the device had been made and the results expressed that the requests of schedule has been satisfied. The main contributions of this thesis are as follows: 1. Specially used integrated circuit which has the functions of data collecting, vector operating, SPWM wave producing and trouble protecting has been researched and manufactured first time in our country. 2. Combining fuzzy control and self-adopted vary construction technologies and using it into actual device. Good controlling effect has been received. The device has high responding speed, low overshot and good robustness. 3. Based on the fundamental of practice, advanced technology and parts has been used as far as possible and vector controlled AC inverter with high reliability has been designed and manufactured. 4. The reliability analysis about the device has been made in details. A variety of steps for increasing reliability have been used in hardwires and software. The designed device has the protecting functions to overvolt, overcurrent, overheat and short of volt.
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