MOTOROLA CPV5370-850-05 850MHZ PENTIII CPCI 64-BIT HOT SWAP CPU,1GB 512MB O/B4實驗及總結該混合式步進電機驅動器已經成功的應用于X-Y數控平臺的運動控制驅動單元,通過開發Win-環境下的控制軟件,利用VC++設計良的控制接口面,方便的實現了步進電機的驅動。該驅動單元通過細分特性,提篼了步進度和定位度。在長時間的大力矩驅動過程中,由于其斬波恒流特性較控制了發熱現象。在現有的諸多起動方,軟起動以其控制方便、可反饋閉環控制、平滑性等優點脫穎而出,倍受青睞,國內的開發研究方興未艾。異步電機軟起動進行仿真研究無疑具有重要意義,傳統使用Folran或C語言建模編程仿真方法存在著些明顯缺點:編程效率不夠高,程序調試比較煩,做動態特性曲線不太方便。由于軟起動系統包括電路、電力電子、電機、控制等多個環節,更增加了傳統方法仿真的困難。
近幾年,特別是998年Matlab5.2新增加了電氣系統模塊庫(PowwSystemBlockset)后,在我國應用Matlab進行電氣仿真異突起,而在此之前,Matlab主要在控制領域被廣泛使用。電氣系統模塊庫以Matlab下的Simulk動態系統建模仿真軟件為運行環境,涵蓋了電路、電力電子、電機等電工學科中常用的基本元件和系統的仿真模型,模塊的使用與常規Simulink模塊類似。本文就在電氣系統模塊庫基礎上,利用Matlab建立異步電機軟起動系統仿真模型,進行仿真。
2異步電機軟起動軟起動器是在電動機調速裝置的基礎上逐步發展起來的,也稱作減壓起動器(SSRVS)。它采用了晶閘管功率元件(SCR)構成的三相交流調壓電路,通過控制晶閘管功率元件的導通角,使施加于電動機的電壓自動逐步升高,電動機從停止狀態向運行狀態逐步加速,終主回路原理圖在額定電壓下穩定運行,主電路基本原理圖如所示。
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