C 4000 #189617

目前，我国的一些电动设备如风机、水泵、压缩机、大型空调和电动机等其用电量占全国总用电量的70%左右，但它们的使用效率较低。就其控制流量和风力而言，风机、水泵和压缩机等大都是挡风板或节流阀来控制，这种控制方式效率低下，浪费了大量的能源。在电动设备中应用变频调速技术，可提高设备的运行效率，同时又能达到节能的目的。本文针对变频调速技术在电动设备中的应用作以分析。
　　变频调速的节电原理，变频调速的基本原理异步电机采用变频调速的原理是：通过整流桥将工频交流电压变为直流电压，再由逆变器转换为频率可调的交流，作为交流异步电机的的驱动电源，使电机获得无级调速所需的电压和电流，是一种无附加转差损耗的高效调速方式。变频调速分为两种方法：交―直―交变频和交―交变频。前者适用于高速小容量电机，后者适用于低速大容量拖动系统。可知，通过改变电源的频率能连续地调节转子的转速。
　　变频调速的节电原理风机、水泵和压缩机等电动设备在工作机械上主要表现为压缩或传输气体或液体，它们的结构和工作特性基本相同，主要表现在流量Q、风压或扬程H、轴功率P关系上。当电动设备的转速一定时，它们的轴功率与单位时间内流过的流量和风压或扬程的乘积成正比，即电动设备的运行工作点由管网特性曲线和其性能曲线的交点确定，图1中的A点即为正常运行工作点，此点随着电动设备负载的变化而变化。当负载减小，调节电机的转子速率，从n变到2，则流量从Q变到Q2，风压或扬程由H变到H2，满足负载要求。根据相似理论，电动设备的流量、扬程与转速的关系为：当转速由n变到2，此时的运行工作点变为B点。则从图1可看出，调速后的轴功率P（等于UQ2，其中U为比例系数）与调速前的轴功率P（等于UQ1，其中U为比例系数）相比减小了很多，且减小后的输出功率满足式（5）：由上式可知，当电动设备的负载变化时，调节转子转速能减少输入功率，从而达到节约资源的目的。
　变频调速的基本装置及运行特点，变频调速的基本装置异步电机的变频调速原理主要是通过改变电源频率来进行的，变频调速的关键装置是频率变换器，即变频器，电流、电压可直接从电网经变压器引到变频器上提供变频电源。变频器的变流元件目前主要有大功率三级管、晶闸管和可关断晶闸管三种。由于交―直―交变频系统相对于交―交变频系统，具有频率范围宽、结构简单、功率因数较高等优点，一直是变频调速的首选方案。装置示意图见图2.
　　变频调速的运行特点变频调速具有调速效率高，启动能耗低，调速范围广，可实现无级调速，动态响应速度快，调速精度高，操作简单，且易于实现生产工艺控制自动化等优点。此外，在装置发生故障后能自动投入工频运行，不会影响生产作业。由于它的调速方式优于其他调速方式，安装场地又比较灵活，应用范围广泛，是市场需求增长最快的调速方式。但其也有缺点，价格昂贵、技术复杂是它的最大缺点，此外变频调速对电网也具有一定的干扰性，如产生高次谐波、电压波动和谐振等。鉴于上述原因，目前变频调速技术主要适用于调速范围广、较长时间低速运行、大容量的电动设备，如容量在30kW及以上的风机、水泵或压缩机上，节电效果明显。
　应用实例下面是某公司中央空调风机水泵改变频节电的运行情况：该公司现有日立中央空调RP―300WL3六套，其中每套风机功率为4.0kW，冷却水泵功率为2.2kW，总功率6.2kW，由于电机采用定速运行，即无论季节与温差高低，均运行在额定转速状态，因此电机的功耗也处于最大状态，根据该公司实际工作情况，按每日工作9小时、一年320个工作日计，六套风机水泵年耗电kW？h，按1元/kW？h计，每年该部分的电费为12.6万元。
　　为了降低这部分的电费，拟采用变频调速技术，使风机水泵根据不同的季节、温差变速运行。根据空调的河北工程技术高等专科学校学报2004基本原理：室内外温差越小，需要的送风量越小，同时，用于冷却冷凝器的冷却水的流量也越小。根据变频调速的节电原理可知：当需要的送风量、冷却水流量减小时，如果通过变频器降低电机的转速，将显著降低电机的功耗，从而达到节电的效
　　风机水泵使用变频器后，由于转速降低，减少了机械磨损，延长了设备检查周期和使用寿命。这些都间接地降低了运行成本。结束语变频调速技术是异步电机最有发展前途的调速方式。随着电力电子技术的进步，变频调速技术将会日渐成熟，这一新技术将会越来越受到工业企业的青睐。通过在用户中的应用和经济效益上的分析，证明变频调速技术在电动设备上的应用是必要的，对传统的电动设备推广应用也是可行的。　
空压机触摸屏工控机远程监控变频器盐城八菱化纤厂有台空压机，台是美国寿型空压机台是国产空压机，作为备用。空压机的启动和停车根据生产随时调度，由工人按要求顺序操作相应开关阀门和主电机完成启停过程当温度压力电机额定电流等超过允许值时来取紧急停车。空压机每间断地运行需由工人连续值守，其中寿力型空压机采用压启动，冲击电流很大，正常运行电流为而时间空压机处于卸载状态，电流另外噪声对长期操作空压机工人的健康有较大的损害，常有操作失误现象，直接影响生产。根据上述情况，对空压机的操作过程进行了全自动变频器控制改造，并在远程操作室设置监控和报警装置，实现了现场无人值守以及远程监控报警等功能。时将主机壳体内之旁路孔打开，使压缩空气回流到转子的吸气端。压缩机组的输气量随之减少，一功耗也随之降低。当用气量过小时，管线压力继续升高，而螺旋阀已全部打开，此时压缩空气以同样原理导通压力调节器，并通过调节寿力控制阀使进气阀门逐渐关小，直至全部关闭。
　　利用显示屏控制器设置管路压力上下限值及相应的电动机运行频率，通过压力传感器实施压力信号反馈，变频器适时改变电动机输人频率，实现空气压力输出的自动控制。通常状态下，可自动控制电机的转速和启动停止，使管路压力维持在之间。
　　电控柜由空气开关交流接触器和电流互感器等组成，完成工频电网与变频电网的投人切除转换与相互联锁。
　　工控机配置的模块有一数字量板一模拟量板及转换器，完成压力温度开关信号的接收，工作参数的设定与显示，输出相应的控制值给变频调速器，来控制空气压机组的转速调节。控制器与富士变频器采用通信方式，通过一换器连接，可提高系统的抗干扰能力，并可采集变频器的各种参数。上位机与控制器采用普通网卡连接，组成以太网，完成空压机的远程监控。
　　当压力升至时，变频器频率逐渐下降到下限值当压力在一时，变频器频率保持不变当压力小于时，变频器频率逐渐上升到上限值使压力上升若压力达到时，则关闭进气阀，打开泄气阀，变频器输出频率逐渐降低直至电动机停止运转，等待压力下降到以下时重新启动。
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1660D07G01Q CrateCAMAC Crate Assy w/ 2840A38G01 Backplane

1661D89G01Power Supply MMI P/S (old version) w/ AC/DC RT301-2 brick and 3MSC7  7380A31G01 card 115VAC

1661D89G02Power Supply MMI P/S (old version) w/ AC/DC RT301-2 brick and 3MSC7  7380A31G01 card 230VAC

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1661D89G05Power Supply MMI P/S (old version) w/ AC/DC RT301-2 brick and 3MSC7  7380A31G01 card 115VAC

1661D89G06Power Supply MMI P/S (old version) w/ AC/DC RT301-2 brick and 3MSC7  7380A31G01 card 230VAC

1A51828G12CableQ-line card cable (angled plug)

1A51829G12CableQ-line card cable (angled plug)

1A54252G02MMIOPR MMI KIT

1A54289G06MMIOPR MMI MOD 4A

1A57252G02MMIOPR MMI KIT

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1B30023H01Ovation ModuleHart End Line Module

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1C31113G04Ovation Module 1VDC Analog Input Electronic Module

1C31113G05Ovation Module 5VDC/0-20mA Analog Input Electronic Module

1C31116G03Ovation Module0-20mA Locally Powered Analog Input Personality Module

1C31122G01Ovation ModuleDigital Output Electronic Module

1C31125G01Ovation ModuleDigital Output Personality Module

1C31125G02Ovation ModuleDigital Output Personality Module

1C31129G01Ovation Module0-5VDC Analog Output Electronic Module

1C31129G02Ovation Module0-10VDC Analog Output Electronic Module

1C31129G03Ovation Module0-20mA Analog Output Electronic Module w/ Diagnostics

1C31129G04Ovation Module0-20mA Analog Output Electronic Module w/o Diagnostics

1C31132G01Ovation ModuleAnalog Outputs Personality Module

1C31147G01Ovation ModulePulse Accumulator

1C31166G01Ovation LC EMODSerial Link Controller

1C31169G02Ovation LC PMODSerial Link Controller RS485 Wire

1C31150G02Ovation ModulePulse Accumulator Personality Module

1C31161G02Ovation ModuleRTD Input Module

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1C31219G01Ovation ModuleRelay Output Logic Module

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1C31224G01Ovation ModuleAnalog Input 4-20mA Module (EMOD)

1C31224G02Ovation ModuleAnalog Input 1V Module (EMOD)

1C31227G01Ovation ModuleAnalog Input Personality Module (PMOD)

1C31227G02Ovation ModuleAnalog Input Personality Module (PMOD)

1C31232G03Ovation DifferentialDI 120VAC/DC Differential E-Mod

1C31233G01Ovation SOE ModuleSequence Of Events Contact Input (24vdc or 48vdc single ended)

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1D54416G01-6Power Supply AssyDPU P/S (old version) w/ AC/DC brick

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1D54458G02KeyboardWDPF Operator Keyboard in Console Fixed cord 230VAC

1D54471G02KeyboardWDPF Mylar keyboard top Board (Older Style)

1D54471G03KeyboardWEStation Mylar keyboard top Board ()

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1D54544G01-8ChassisWDPF Chassis (9 Slot)

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1D54574G01KeypadLIM Assy keypad

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1X00024H03Power Supply MagneTek model  Power Supply 48V Aux, AC

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1X00024H06Power Supply MagneTek model  Power Supply 48V Aux, DC

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1X00093H05SwitchEthernet Switch (24 Ports) - Partner Fanout

1X00093H08SwitchEthernet Switch (24 Ports) - Root

1X00093H09SwitchEthernet Switch (24 Ports) - Backup

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1X00415H01NICOvation Network Interface Card, Single Port

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1X00417H02Power SupplyPowerOne WH7A-2DJ plug-in style I/O Power Supply 13/48VDC w/ AC input

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2380C91G03Temp SensorTemp Sensor

2623D37G01ModuleNL-1075B Comm Adapter

2837A11G014NCH5NCH G01 card

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2840A17G015QTO2QTO TRIAC Output card - 115VAC

2840A17G015QTO3QTO TRIAC Output card - 115VAC

2840A17G063QDI39QDI G06 card (replaced by QID G06) Sub 1

2840A17G064QDI6QDI G06 card (replaced by QID G06) Sub 4

2840A18G016QRO5QRO G01 Relay Output card - 330VDC/250VAC Form A Sub 2

2840A18G016QRO9QRO G01 Relay Output card - 330VDC/250VAC Form A Sub 3

2840A18G016QRO13QRO G01 Relay Output card - 330VDC/250VAC Form A Sub 5

2840A18G016QRO17QRO G01 Relay Output card - 330VDC/250VAC Form A Sub 5

2840A18G016QRO23QRO G01 Relay Output card - 330VDC/250VAC Form A Sub 5

2840A18G016QRO27QRO G01 Relay Output card - 330VDC/250VAC Form A Sub 5

2840A18G017QRO1QRO G01 Relay Output card - 330VDC/250VAC Form A Sub 5

2840A18G01 3A99168G018QRO1QRO G01 Relay Output card - 330VDC/250VAC Form A

2840A18G01 3A99168G018QRO7QRO G01 Relay Output card - 330VDC/250VAC Form A

2840A18G026QRO13QRO G02 Relay Output card - 330VDC/250VAC Form B Sub 5

2840A18G028QRO1QRO G02 Relay Output card - 330VDC/250VAC Form B

2840A18G036QRO11QRO G03 Relay Output card - Form A non-inductive loads Sub 5

2840A18G046QRO13QRO G04 Relay Output card - Form B non-inductive loads

2840A19G074QAI17QAI G07 Analog Input card - 0 to +20mA

2840A20G013QTB17QTB G01 Time Base card - 60 Hz (+/-2 Hz input)

2840A20G013QTB21QTB G01 Time Base card - 60 Hz (+/-2 Hz input)

2840A20G023QTB26QTB G02 Time Base card - 50 Hz (+/-2 Hz input)

2840A20G033QTB27QTB G03 Time Base card

2840A21G015QAO57QAO G01 Analog Output card - 20mA  

2840A21G017QAO20QAO G01 Analog Output card - 20mA  

2840A21G018QAO1QAO G01 Analog Output card - 20mA  Sub 20

2840A21G018QAO9QAO G01 Analog Output card - 20mA  Sub 20

2840A21G018QAO17QAO G01 Analog Output card - 20mA  Sub 20

2840A21G018QAO20QAO G01 Analog Output card - 20mA

2840A21G018QAO22QAO G01 Analog Output card - 20mA

2840A21G01 3A99161G0110QAO17QAO G01 Analog Output card - 20mA Sub 27 & 28

2840A21G01 3A99161G0111QAO1QAO G01 Analog Output card - 20mA Sub 29 & 30

2840A21G01 3A99161G0111QAO9QAO G01 Analog Output card - 20mA Sub 31

2840A21G01 1P00000G0113QAO1QAO G01 Analog Output card - 20mA Sub 33

2840A21G01 1P00000G0113QAO9QAO G01 Analog Output card - 20mA Sub 35

2840A21G025QAO42QAO G02 Analog Output card - 10VDC Sub 9

2840A21G027QAO21QAO G02 Analog Output card - 10VDC

2840A21G044QAO38QAO G04 Analog Output card - 5VDC

2840A21G048QAO4QAO G04 Analog Output card - 5VDC

2840A21G055QAO61QAO G05 Analog Output card - (+/-)5VDC

2840A21G057QAO24QAO G05 Analog Output card - (+/-)5VDC

2840A21G057QAO32QAO G05 Analog Output card - (+/-)5VDC

2840A21G058QAO5QAO G05 Analog Output card - (+/-)5VDC

2840A21G0513QAO13QAO G05 Analog Output card - (+/-)5VDC

2840A21G068QAO22QAO G06 Analog Output card - (+/-)10VDC

2840A21G075QAO37QAO G07 Analog Output card - 20mA

2840A21G08QAOQAO G06 Analog Output card - (+/-)10VDC

2840A38G01BackplaneQ-Crate Backplane

2840A49G01 1QEX4QEX Q-Line Extender

2840A49G01 404A724G011QEX6QEX Q-Line Extender

2840A75G013QSC7QSC G01 Speed Channel card

2840A75G023QSC8QSC G02 Speed Channel card

2840A77G021QPP6QPP G02 card

2840A78G014QSD14QSD Servo Driver card - (+/-)24mA output

2840A79G01 3QBO21QBO G01 Digital Output card - 60VDC @ 300mA (max) Sub 2

2840A79G01 3QBO27QBO G01 Digital Output card - 60VDC @ 300mA (max) Sub 5

2840A79G01 2840A79G813QBO21QBO G01 Digital Output card - 60VDC @ 300mA (max) Sub 5

2840A79G013QBO33QBO G01 Digital Output card - 60VDC @ 300mA (max)

2840A79G01 3A99162G014QBO16QBO G01 Digital Output card - 60VDC @ 300mA (max)

2840A79G023QBO28QBO G02 Digital Output card - 60VDC @ 300mA (max) w/ filters Sub 5

2840A79G03QBOQBO G03 Logic Output card - 20VDC @ 16mA (max) w/ flashing

2840A79G04 3QBO19QBO G04 Logic Output card - 20VDC @ 16mA (max)

2840A79G04 3QBO24QBO G04 Logic Output card - 20VDC @ 16mA (max)

2840A79G05QBOQBO G05 Logic Output card - 20VDC @ 16mA (max) w/ flashing, pull-up

2840A80G046QBI4QBI G04 Digital Input card - +24 (20 to 30)VDC

2840A80G046QBI14QBI G04 Digital Input card - +24 (20 to 30)VDC

2840A80G065QBI17QBI G06 Digital Input card - +48 (40 to 60)VDC

2840A80G075QBI8QBI G07 Digital Input card

2840A80G076QBI7QBI G07 Digital Input card

2840A80G085QBI9QBI G08 Digital Input card

2840A80G086QBI8QBI G08 Digital Input card

2840A80G116QBI11QBI G11 Digital Input card - +120 (100 to 150)VAC (High Threshold)

2840A85G01QMSQMS G01 card

2840A86G052QAC11QAC G05 Analog Cond. card - +120mA at +48VDC

2D34069G01CabinetWDPF "A" Cabinet

2D34347G05Power Supply AssyDual 24VDC Power Supply Assy w/2ea Advance MG24-10C 115VAC

2D34347G06Power Supply AssyDual 24VDC Power Supply Assy w/2ea Advance MG24-10C 230VAC

2D34347G07Power Supply AssyDual 48VDC Power Supply Assy w/2ea Advance MG48-5C 115VAC

2D34347G08Power Supply AssyDual 48VDC Power Supply Assy w/2ea Advance MG48-5C 230VAC

320117-05ACardKalex SC401141-45

399D915G05Gnd Det Pnlgray rack panel

3A42902H01PrinterGenicom 3410XCQ Color Printer

3A43019G02Panel13VDC Power Supply Monitoring Panel w/ Cable

3A43084G01SBUSSBUS/MultiBUS

3A56324G11ChassisOPR MMI

3A58354G02TFR AssyTFR Modification Assy (same as TFR Assy 4D33764G01 but w/ sticker on front)

3A58919G12CableOrange Cable Assy RTD - N

3A58939G15 KeyboardSUN Type 6 Keyboard and Mouse

3A58945H01Monitor20/19" SUN CRT (19.1" LCD replacement solution)

3A58992H04Cable3BNC RGB Video Cable for SUN Sparc5

3A59104G01VXI KitVXI Kit

3A59104G02Card Cage486 WEStation Q-line Remote I/O (on front of cage w/ MRC, MHC, MDX cards)

3A59104G04Card Cage486 WEStation Q-line Remote I/O (on front of cage w/ MRC, MHC, MDX cards)

3A59323G01ChassisENGR MMI Chassis

3A59323G02ChassisENG MMI Chassis

3A59324G01ChassisOPR MMI Chassis

3A59324G02ChassisOPR MMI Chassis

3A59324G12ChassisOPR MMI Chassis

3A59347G01Q CrateQ-Line Remote I/O card cage w/ 4256A99G02 BP & 1D54557G10 on cage side

3A59324G11ChassisOPR MMI Chassis

3A59341G03Interface StripWDPF IIU Kit (Interface Strip in VME chassis)

3A59351G11ChassisOPR MMI Chassis

3A59526G12CableGreen cable out CH0 on front of VME SHC card

3A59527G12CableYellow cable out CH1 on front of VME SHC card

3A98608G03PortVME SCSI Serial Port Device

3A98641H02Adapter25pin serial female to 9pin male adapter

3A98643G03CableRibon Cable to MRC card

3A98648G32TAP PanelCluster TAP Panel w/ 2ea 5D32025G04 Ethernet TAP & 4ea 5D32024G01 RTP

3A98688G02SCSI CableSCSI Cable on front of VME chassis

3A98688G03SCSI CableSCSI Cable on front of VME chassis

3A98688G04SCSI CableSCSI Cable on front of VME chassis

3A98720G18CableGreen Cable out the front of VME Sparc

3A98726G06CableTrackball Cable

3A98763G02 CableFO Cable, Clip-on style, Green 25ft

3A98763G03CableFO Cable, Clip-on style, Green 50ft

3A98764G02 CableFO Cable, Clip-on style, Yellow 25ft

3A98764G03CableFO Cable, Clip-on style, Yellow 50ft

3A98768G01 SwitchSwitch

3A98807G05CableSerial Model 25 pin Male

3A98826H01TrackballITAC Sys B-SUNMD Trackball (White)

3A98826H02TrackballITAC Sys B-SUNID Trackball (Black)

3A98826H06TrackballSUN Trackball

3A98833H01CableSUN SCCI CABLE

3A98833H03CableSUN SCSI CABLE

3A98833H12CableSUN SCSI CABLE

3A98833H23CableSUN SCSI CABLE

3A98865G01CableGreen Cable to TAP Panel Assy

3A98871H01KeyboardEngineering 101 Key Keyboard NMB RT101  116305-002

3A98963G05KeyboardWEStation Operator Membrane Keyboard

3A99101G012QSR35QSR G01 Servo Driver w/ Position Readback card 4DC LVDTs

3A99101G02QSRQSR G02 Servo Driver w/ Position Readback card 2AC LVDTs

3A99108G01QRSQRS G01

3A99109G01QRFQFR - 4 wire RTD Input Amplifier

3A99114G03QRDQRD G03 Module - 200 Ohm Platinum RTD

3A99114G04QRDQRD G04 Module - 200 Ohm Platinum RTD

3A99116G014MDPS3MDPS Board (inside 5D32191G01 MPS512-PFC power supply)

3A99116G014MDPS9MDPS Board (inside 5D32191G01 MPS512-PFC power supply)