| In recent years, with the high development of power electronic technology and controltheory, AC (Alternating Current) speed-adjustable technology has made breakthroughprogress. Frequency control technology has replaced the DC (Direct Current) speed controlgradually with the excellent performance of speed regulation, higher power factor, goodenergy saving effect, widespread applicability and so on, and been considered as the mostpromising speed regulation mode. The traditional AC speed regulation system sendscontrol signal by SCM (Single Chip Microcomputer), not only tedious programming, butalso complex hardware circuit, these made the development cost increase gradually.With the rapid development of computer technology, a new instrumentconcept-virtual instrument has been born. Virtual instrument has more advantages than thetraditions, is the future direction. This subject aims to combine frequency controltechnology and virtual instrument technology, In view of the flexibility and opennesscharacteristics of virtual instrument, strong processing capacity of computer, useLabVIEW the concise and easy to understand graphical programing language to realize theSPWM signal generation and SVPWM signal generation. The signals generated are outputto IPM (Intelligent Power Module) by NI ELVIS. Six IGBTs breaking time of IPM can becontrolled by regulate the parameters of computer soft panel. So the speed control ofthree-phase asynchronous motor can be realized, in order to replace the traditional controlsystem which outputs signals by SCM.The system is stable and reliable was verified, the cost of development is reducedgreatly, the cycle of development is shortened and the flexibility of system is improved.Therefore it has a good application prospect. |
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