描述
異步電動機的制動方法一般有兩類:機械制動和電氣制動。機械制動常用的方法有:電磁抱閘和電磁離合器制動。常用的制動方法有能耗制動、反接制動和回饋制動。
反接制動的優(yōu)點是:制動力強,制動迅速。缺點是:制動準確性差,制動過程中沖擊強烈,易損壞傳動零件,制動能量消耗大,不宜經(jīng)常制動。因此反接制動一般適用于制動要求迅速、系統(tǒng)慣性較大,不經(jīng)常啟動與制動的場合。
能耗制動的優(yōu)點是制動準確、平穩(wěn),且能量消耗較小。缺點是需附加直流電源裝置,設(shè)備費用較高,制動力較弱,在低速時制動力矩小。所以,能耗制動一般用于要求制動準確、平穩(wěn)的場合。
回饋制動是一種比較經(jīng)濟的制動方法。制動時不需改變線路即可從電動運行狀態(tài)自動地轉(zhuǎn)入發(fā)電制動狀態(tài),把機械能轉(zhuǎn)換成電能再回饋到電網(wǎng),節(jié)能效果顯著。缺點是應(yīng)用范圍較窄,僅當電動機轉(zhuǎn)速大于同步轉(zhuǎn)速時才能實現(xiàn)發(fā)電制動。
歐美品牌停產(chǎn)的,常用的“PLC”備品備件
我司產(chǎn)品應(yīng)用于以下領(lǐng)域:
1,《發(fā)電廠DCS監(jiān)控系統(tǒng)》
2,《智能平鋼化爐系統(tǒng)制造》
3,《PLC可編程輸送控制系統(tǒng)》
4,《DCS集散控制系統(tǒng)》
?
5,《智能型消防供水控制系統(tǒng)》
6,《化工廠藥液恒流量計算機控制系統(tǒng)》
7,《電氣控制系統(tǒng)》造紙,印染生產(chǎn)線,變電站綜合自動化控制系列
本特利,英維思,伍德沃德,??怂共_、西屋、瑞恩、施耐德莫迪康、ABB、AB、西門子、摩托羅拉、GE發(fā)那科、安川、博世力士樂,ACSO,力士樂等各大品牌的DCS系統(tǒng)配件,機器人系統(tǒng)配件,大型伺服系統(tǒng)備件。
C61589 Varian G-292 Rotating Anode X-Ray Tube in B-130H
G52749 SSE Corp.M20 Wet Process Wafer Cleaning System
G54937 Alcatel IPUP A100L Dry Vacuum Pump
G54939 Alcatel IPUP A100L Dry Vacuum Pump
G71680 Valhalla Scientific D6100 Spectral Pwr.Analyzer
G54942 Alcatel IPUP A100L Dry Vacuum Pump
C54282 Hot Cold Temp Vacuum Wafer Chuck 11″Stage
G72623 Brinkman Metrohm 701 KF Titrino&703 Ti Stand
C67233 Adept Robot Module 90400-04318/XY-P177S180-1
A72721 Beckman Allegra 6R Refrigerated Centrifuge
L72707 Agilent VXI E1439C 95MSa/s Digitizer DSP Opt.001
C56452 Tektronix TLA715 Logic Analyzer(Calibrated 2010
G71828 DeHaart MPC 24/29 Screen Printer
L70516 Varian DS 102 Dual Stage Rotary Vane Vacuum Pump
A69922 Lot of(2)EPE Computer Power Center PowerPacs
C51252 Tektronix TLA715 Logic Analyzer(Calibrated 2010
CC44406 MRL 14TC-45 Conveyer Furnace/Reflow Oven
AC44258 Prometrix Spectromap Film Wafer System SM200/e
C69221 Wentworth FIX-R-1-E Probe Card Repair Station
A34721 Thermotron Environmental Chamber,460/3/60
A68882 Lindberg/Blue M STF55666C Solid Tube Furnace
C67797 R&K Rucker Kolls 300 Probe Card Building Station
C53849 Precision Measurement Microscope Sys w/X-Y Stage
C55172 Tektronix TLA715 Logic Analyzer
K67775 Kulicke&Soffa 6490 Semi-Auto DieBonder
N60611 2 Forma Scientific 3250 Water Jacketed Incubator
K71127 PRI Equipe ATM Wafer Robot&ESC-100 Controller
K71478 LOT 2 PRI/Equipe ATM Wafer Loading Robot Arm
A72337 PE Applied Biosystems GeneAmp PCR System 9700
C72662 Powervar GPI 3-Phase Power Conditioner 125kVA
C72667 MECS UTX-1000 Wafer Robot&CS-1000 Controller
C67115 HP Agilent 2090-0357 Vacuum Fluorescent Display
C67234 Adept Robot Module 90403-41063R XY-HRS063CS110A?D
CT40559 Multiple-Axis Focusing Laser Optics Positioner
C67232 Adept Robot Module 90400-04314/XY-P177S140-1AD
C67231 Adept Robot Module 90400-20025 XY-HRS025-M201A?D
C67230 Adept Robot Module 90402-30053 XY-HRS053-S201A?D-
C59691 Aetrium 900A Pick&Place IC Test Handler
C59690 Despatch LCC1-54N-2 Environmental Chamber
N66593 Beckman Instruments P/ACE 5500 System
A72720 Beckman GS-6R Refrigerated Centrifuge
L72705 Agilent VXI E2731B 20MHz to 6.0GHz RF Tuner
L72706 Agilent VXI E1439C 95MSa/s Digitizer DSP
N72744 Lot(2)HP 5890 Series II Gas Chromatographs
K72695 Innovate 9000 Semiconductor Test Head 220V
A72761 AMC Automation&Modular Component Modu-Con MX2
C70104 TermoTek P310 Recirculating Laser Chiller 18.0°C
C70149 Wentworth Probe Card Building/Repair Station
A62925 Nicolet 5DXC FT-IR Spectrometer
N59239 Nicolet 510 FT-IR Spectrometer FTIR
L69033 Asymtek FSLU Automated Wafer Loader(upstream)
C69606 Intevac NCT 200L Assy Sputtering Source Gun
C70441 Intevac Sputtering Source NCT Intervace Mark V
A39173 Carbolite Type GPC 12/65 Chamber Furnace,1200°C
AH43124 UTE SCS i 124 Substrate Vertical Lap Cleaner
A60926 ALPHASEM AG DB608-PRL Die Bonder w/Selectron
AC44359 Prometrix Resistivity Prober 6″VR-30A System
C71872 CTI-Cryogenics Cryo-Torr 100 Cryopump Cryo Pump
N62543 Branson/IPC PM-122 1000W RF Generator
N62542 Branson/IPC 2000C Controller 2000 C
K68523 Kern CPM1 Stereocomparato?r Mono/Stereo
A64697 Advanced Energy LDM Plasma RF Power Supply
AT51403 Hughes Model 2500 Automatic Die Bonder
Y69709 Hydra Cell Pump D17XASGNNEMB D17 D17X
A65762 Waters 717 Plus Autosampler
A64698 Advanced Energy PEP-2500 Plasma RF Power Supply
N70824 Christie Vista 38-DMD021-01 DLP Projector
N67909 BD GenTest KNA Solubility Scanner System
G61761 Applied Biosystems 373 DNA Sequence Stretch
Y69096 Asymtek FSL D Downstream Unloader
C69488 Neslab RTE-211 Refrigerated Recirculator Chiller