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1、畢業(yè)設(shè)計(jì)(論文)交流異步電動(dòng)機(jī)變頻調(diào)速系統(tǒng)設(shè)計(jì)摘要近年來,交流電機(jī)變頻調(diào)速及其相關(guān)技術(shù)的研究己成為現(xiàn)代電氣傳動(dòng)領(lǐng)域的一個(gè)重要課題,并且隨著新的電力電子器件和微處理器的推出以及交流電機(jī)控制理論的發(fā)展,交流變頻調(diào)速技術(shù)還將會(huì)取得巨大進(jìn)步。本文對(duì)變頻調(diào)速理論,逆變技術(shù),SPWM產(chǎn)生原理進(jìn)行了研究,在此基礎(chǔ)上設(shè)計(jì)了一種新型數(shù)字化三相SPWM變頻調(diào)速系統(tǒng),以8051控制專用集成芯片SA4828為控制核心,采用IGBT作為主功率器件,同時(shí)采用EXB840構(gòu)成IGBT的驅(qū)動(dòng)電路,整流電路采用二極管,可使功率因數(shù)接近1,并且只用一級(jí)可控的功率環(huán)節(jié)
2、,電路結(jié)構(gòu)比較簡單。本文在控制上采用恒控制,同時(shí),軟件程序使得參數(shù)的輸入和變頻器運(yùn)行方式的改變極為方便,新型集成元件的采用也使得它的開發(fā)周期短。另外,本文對(duì)SA4828三相SPWM波發(fā)生器的使用和編程進(jìn)行了詳細(xì)介紹,完成了整個(gè)系統(tǒng)控制部分的軟硬件設(shè)計(jì)。關(guān)鍵字:變頻調(diào)速,正弦脈寬調(diào)制,控制,SA4828波形發(fā)生器i畢業(yè)設(shè)計(jì)(論文)ACINDUCTIONMOTORSPEED-ADJUSTEDSYSTEMDESIGNABSTRACTRecently,theresearchofvariablefrequencyspeedvariation
3、ofACmotorandrelevanttechnologyhasbecomeanimportantissueinelectricaldrivefield,withtheappearanceofnewpowerelectronapparatusandmicroprocessorandthedevelopmentofthecontroltheory,thetechnologyofvariablefrequencyspeedvariationwillimprovemorerapidly.Thisthesishasaresearchon
4、thesetechnologies:VariableVoltageVariableFrequencymotordrive,inverter,andthecreationprincipleofSPWM,Basedontheresultsofthestudy,IdesignedasystemofanewdigitalthreephasesVVVFmotordrivesystem.ItusesASIC-SA4828controlledby8051asmaincontrollingcore,itusesIGBTaspowerdevice,
5、andusesEXB840asdrive.Itusesdiodesasconvertingcircuitunit,whichmakespowerfactorcloseto1.BecauseIonlyneedtocontrolinverter,thewholecircuitisverysimple.Iadoptthemeansoflinearoperation.Atthesametime,itisveryconvenienttoinputparametersorchangethedrive’soperatingmodeduetoth
6、esoftwareprocedure.Moreover,owingtotheadvantagesofthenewintegratedparts,itcostslesstimetodevelopthismotordrive.ThisthesishasalsodetailintroducedthemethodoftheusageandtheprogramsofthethreephasesSPWMwavegeneratorSA4828.Thesoftwareandthehardwareofthecontrolpartinsystemha
7、vebeencompleted.Keywords:variablefrequencyspeedcontrol,SinePulseWidthModulation(SPWM),operation;SA4828WaveGeneratori畢業(yè)設(shè)計(jì)(論文)目錄摘要iAbstractii1緒 論11.1 變頻調(diào)速技術(shù)簡介11.2變頻器的發(fā)展現(xiàn)狀和趨勢(shì)21.2.1變頻器的發(fā)展現(xiàn)狀21.2.2變頻器技術(shù)的發(fā)展趨勢(shì)21.3研究的目的與意義31.4本次設(shè)計(jì)方案簡介41.4.1變頻器主電路方案的選定41.4.2系統(tǒng)原理框圖及各部分簡介51.4.3選用
8、電動(dòng)機(jī)原始參數(shù)62交流異步電動(dòng)機(jī)變頻調(diào)速原理及方法82.1三相異步電機(jī)工作的基本原理82.1.1異步電機(jī)的等效電路82.1.2異步電動(dòng)機(jī)的轉(zhuǎn)矩92.1.3異步電動(dòng)機(jī)的機(jī)械特性102.1.4異步電機(jī)變頻調(diào)速原理122.2變頻調(diào)速的控制方式及選定132