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《三菱变频器对异步电动机调速控制-三相异步电动机调速控制系统毕业设计(机械cad图纸)》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、本科机械毕业设计论文CAD图纸QQ401339828摘要随着变频调速异步电动机在国内外市场上日益扩大应用,自90年代中期以来,我国有众多电动机生产企业设计、研制和生产适用于不同应用的各种系列变频调速三相异步电动机,例如:通用变频调速电动机系列、起重冶金变频调速电动机系列、隔爆变频调速电动机系列、电梯变频调速电动机系列、辊道变频调速电动机系列、牵引变频调速电动机系列等。从目前情况看,这些系列电动机能基本满足国内市场的需求原理是当定子三绕组通三相对称电流后,定转子产生旋转磁场,根据右手定则,转子绕组产生感应电动势,由于绕组是闭合的,所以产生感应电流,
2、根据左手定则,转子绕组相当于空间绕组,进而产生电磁转距,合成磁转距大于阻转距时,电机起动,重点是三相异步电动机变频调速,一方面当f1<fN时,为恒转矩调速,转矩不变,额定转速降低,增大起动转矩Tst,另一方面当f1>fN时,为恒功率调速,调速前后功率不变,额定转速升高,减小启动转矩Tst。变频调速可以实现宽范围内的平滑调速,变频调速电机以简单的结构、优良的调速性能、较高的调速比,应用越来越广泛。本论文的主要就是利用三菱变频器,对三相异步电动机进行变频的调速。关键词:三相异步电动机;三菱变频器;变频调速本科机械毕业设计论文CAD图纸QQ401339
3、828AbstractWiththeincreasingapplicationofVVVFasynchronousmotorsinthedomesticandforeignmarkets,sincethemiddleof90's,China'smotormanufacturersdesign,developmentandproductionissuitableforvariousseriesofVariable-FrequencyAdjustable-SpeedThree-PhaseAsynchronousMotor,differentappli
4、cationssuchas:GeneralVVVFmotorseries,craneandmetallurgicalVVVFmotorseries,flameproofinvertermotorseries,VVVFelevatormotorseries,rollerVVVFmotorseries,inverter-fedmotorseries.Judgingfromthecurrentsituation,theseseriesmotorscanbasicallymeettheneedsofthedomesticmarketistheprinci
5、plewhenthestatorwindingthroughthreesymmetricalthree-phasecurrent,statorandrotorrotatingmagneticfieldisgenerated,accordingtotheright-handrule,therotorwindinginducedelectromotiveforce,thewindingisclosed,sogenerateinductioncurrent,accordingtotheleft,therotorwindingisequivalentto
6、spacewinding,andelectromagnetictorque,startingmotormagnetictorqueisgreaterthantheresistanceofsynthesisoftorque,,thefocusisvariablefrequencyspeedcontrolofthree-phaseasynchronousmotor,handwhenF17、tingtorqueofTst,ontheotherhand,whenF1>fN,forconstantpowerspeed,speedregulationandconstantpower,ratedspeedincreased,reducethestartingtorqueTst.VVVFcanachievesmoothspeedwiderange,frequencyconversionmotorwithsimplestructure,goodperformanceofspeedregulation,highspeedadjustment,mo
8、reandmoreextensiveapplication.ThemainofthispaperistoutilizeMitsubish