A87L-0001-0086A87L-0001-0086A87L-0001-0086-------------------------------------------------------------------------------------北上广不相信眼泪黑吉辽不相信喝醉江浙沪不相信邮费陕甘宁不相信水费京津翼不相信好肺福建宇创不相信货贵找我买产品不相信服务不到位！！！不吹牛，***低于同行15个点，欢迎来电垂询！联系人：兰工手机：18050108093电话：0592-7796665传真：0592-6535181***:2745705376E-mail:2745705376@***.com主营产品：DCS集散式控制系统、PLC可编程控制器、数控系统、(CPU处理器、模块、卡件、控制器、伺服驱动、工作站、驱动器、马达、内存卡、电源，机器人备件等)各类工控产品主要业务:ABBDCS卡件AB1756，1747，1785系列PLCCPU，Siemens6DD，6FX，6SC，6FC，6S5系列，Foxboro系统卡件，Triconex系统模块，Rexroth力士乐全系列产品，Modicon停产模块等各类工控产品Schneider（施耐德）140系列PLC,CPUOvation系统模块----------------------------------------------------------------------------------------伺服与变频的一个重要区别是：变频可以无编码器，伺服则必须有编码器，作电子换向用.一、两者的共同点：交流伺服的技术本身就是借鉴并应用了变频的技术，在直流电机的伺服控制的基础上通过变频的PWM方式模仿直流电机的控制方式来实现的，也就是说交流伺服电机必然有变频的这一环节：变频就是将工频的50、60HZ的交流电先整流成直流电，然后通过可控制门极的各类晶体管（IGBT，IGCT等）通过载波频率和PWM调节逆变为频率可调的波形类似于正余弦的脉动电，由于频率可调，所以交流电机的速度就可调了（n=60f/p，n转速，f频率，p极对数）二、谈谈变频器：简单的变频器只能调节交流电机的速度，这时可以开环也可以闭环要视控制方式和变频器而定，这就是传统意义上的V/F控制方式。很多的变频已经通过数学模型的建立，将交流电机的定子磁场UVW3相转化为可以控制电机转速和转矩的两个电流的分量，大多数能进行力矩控制的***品牌的变频器都是采用这样方式控制力矩，UVW每相的输出要加霍尔效应的电流检测装置，采样反馈后构成闭环负反馈的电流环的PID调节；ABB的变频又提出和这样方式不同的直接转矩控制技术，具体请查阅有关资料。这样可以既控制电机的速度也可控制电机的力矩，而且速度的控制精度优于v/f控制，编码器反馈也可加可不加，加的时候控制精度和响应特性要好很多。三、谈谈伺服：驱动器方面：伺服驱动器在发展了变频技术的前提下，在驱动器内部的电流环，速度环和位置环（变频器没有该环）都进行了比一般变频更***的控制技术和算法运算，在功能上也比传统的伺服强大很多，主要的一点可以进行***的位置控制。通过上位控制器发送的脉冲序列来控制速度和位置（当然也有些伺服内部集成了控制单元或通过总线通讯的方式直接将位置和速度等参数设定在驱动器里），驱动器内部的算法和更快更***的计算以及性能更优良的电子器件使之更优越于变频器。电机方面：伺服电机的材料、结构和加工工艺要远远高于变频器驱动的交流电机（一般交流电机或恒力矩、恒功率等各类变频电机），也就是说当驱动器输出电流、电压、频率变化很快的电源时，伺服电机就能根据电源变化产生响应的动作变化，响应特性和抗过载能力远远高于变频器驱动的交流电机，电机方面的严重差异也是两者性能不同的根本。就是说不是变频器输出不了变化那么快的电源信号，而是电机本身就反应不了，所以在变频的内部算法设定时为了保护电机做了相应的过载设定。当然即使不设定变频器的输出能力还是有限的，有些性能优良的变频器就可以直接驱动伺服电机AllenBradley8720MC-RPS065-VB-MRegenerativePowerSupply125HPVariableFrequencyDriveVFDAllenBradley1336FB100ANENL6RockwellAutomation1336125hp460VvfddriveABAllenBradleyRetiringFromE-BayLotSaleofAllenBradleyItemsRemanufacturedAllenBradleyMPL-B960D-MJ22AAServoMotor7096-07-4202PowerFlex753VFD!AllenBradleyUltra50002098-IPD-HV150|Ser.A|V1.08|ServoDriveSealedAllenBradleyRP-144442KITGTOINSTALL180KVA/29SealedAllenBradleyPanelViewPlus15002711P-B15***A12711PB15***A1KeypadSealedAllenBradley1785-L60B/EPLC-5/60Processor4xDH+/RIOControllerSealedAllenBradley1757-SRM/BProcessLogixControlLogixSystemRedundancySealedAllenBradley1756-L74/B2015ControlLogixLogix5574Processor16MbSealedAllenBradley1756-L74/AControlLogixLogix5574Processor16MbQtyINBOXALLENBRADLEY2711P-B15***A2/A2711PB15***A2/AAllen-BradleyPowerFlex70020BD156A0ANNAND0125hp480V(MFD:2012)ALLEN-BRADLEY6155-EEYADDACAAZINDUSTRIALCOMPUTER,STBVISION,MSDOSGAALLEN-BRADLEY150-F251NBDSOFTSTARTMCCCENTERLINE2100ALLENBRADLEYPV10002711-T10C8SERD2711T10C8NIBALLENBRADLEYPV+7002711P-T7C15A22711PT7C15A2NIBALLENBRADLEYPVPLUS2711P-B12***D120112711PB12***D1NIBALLENBRADLEYPVPLUS2711P-B12***A8SEALED200142711PB12***A8ALLENBRADLEYPVPLUS12502711P-T12C15A22711PT12C15A2NIBALLENBRADLEYPOWERFLEX753DRIVE20F11ND077AA0NNNNNALLENBRADLEYPOWERFLEX70075HP20BD096M0ANNAND020BD096A0ANNAND0ALLENBRADLEYPLC-5/V80B1785-V80B/EPROCESSORMODULEVME/PLC5100KWORDALLENBRADLEYPANELVIEW10002711-T10C9SERFFRN4.482711T10C9100-240VACALLENBRADLEYPANELVIEW10002711-K10G20L1SERDFRN4.4624VDCRS232AllenBradleyBulletin2100BDDG60Size6ComboStarterAllenBradleyBulletin150***artMotorController150-A240NBDSeriesB240HPALLENBRADLEY500-GOD930STARTERSIZE6ALLENBRADLEY500-GOB930STARTERSIZE6AllenBradley2711-K10C8/FPanelView1000ColorKeypad/DH+/RS-232-PrtALLENBRADLEY20F14ND125AN0NNNNN100HPPOWERFLEX753ALLENBRADLEY1MEGLOGICPROCESSORMODULE1MEG,5250-LP3BA-B96802480BZAAllenBradley1785-L80E/EPLC-5/80EEtherNetController100KWordWarrantyAllenBradley1785-BCM/BPLC-5Back-UpCommunicationModuleAllenBradley1785-BCM/BPLC-5Back-UpCommunicationModuleAllenBradley1756-L74/B2013ControlLogixLogix5574Processor16MbALLENBRADLEY1756-L55M1420051756L55M141756-L55&1756-M14NIBALLENBRADLEY150-F480NBDB***C-FLEXSOFTSTART***ARTMOTORCONTROLLERFACTORYSEALEDALLEN-BRADLEY2711P-B15***D72711PB15***D7SERA,MFG04/2008FACTORYSEALALLEN-BRADLEY2711P-T15C15D12711PT15C15D1CooperCrouseHindsD2LCS324241153M100ExplosionProofPowerPlusPanelboardNIBAlveyCaseDiverterZipSwitchwithAllenBradleyPLCAllen-BradleyPowerFlex700ACDrivew/Keypad20BD125A0ANNANB0100HPALLEN-BRADLEYINBOXREMANUFACTURED50HPDRIVE1336F-B050-AN-ENSERIESBAllen-Bradley96635301,FanucA16B-2200-0431Allen-Bradley75HpVFD1336PlusACDrive1336S-B075-AA-EN-GM1-HA2-L6E1YrWarALLEN-BRADLEY2711E-K10C6PANELVIEW1000e10.4inCOLORFLATPANELDISPLAYNIB**Allen-Bradley2099-BM09-SKinetix7000PowerServoDriveAllen-Bradley1785-L80B/ELifetimeWarranty!!!ALLEN-BRADLEY1785-L46C15/FPLC-5/46CONTROLNETPROCESSORMODULEINBOXAllen-bradley150-A240NBD-8L4CONTROLLER***CPLUS240AMP3PH200HP480VACAllen-Bradley1395-B74N-C2-PZ60hpDCController,SeriesBALLENBRADLEYVERS***IEWCE6182H-15TEH4D6182H15TEH4DTOUCHSCREENALLENBRADLEY***CDIALOGPLUSMOTORCONTROLLER150-B240NBDSER.AALLENBRADLEYPV10002711-K10G162711K10G164.432711-K10G16XALLENBRADLEYPVPLUS12502711P-T12C6A22711PT12C6A2ALLENBRADLEYPOWERFLEX70075HP20BD096A0ANNANC0TESTEDTAKEOUTAllenBradleyPane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