描述
軸承電流主要以三種方式存在:dv/dt電流、EDM(ElectricDischargeMachining)電流和環(huán)路電流。軸電壓的大小不僅與電機內(nèi)各部分耦合電容參數(shù)有關(guān),且與脈沖電壓上升時間和幅值有關(guān)。dv/dt電流主要與PWM的上升時間tr有關(guān),tr越小,dv/dt電流的幅值越大;逆變器載波頻率越高,軸承電流中的dv/dt電流成分越多。EDM電流出現(xiàn)存在一定的偶然性,只有當軸承潤滑油層被擊穿或者軸承內(nèi)部發(fā)生接觸時,存儲在電子轉(zhuǎn)子對地電容Crf上的電荷(1/2Crf×Urf)通過軸承等效回路Rb、Cb和Zb對地進行火花式放電,造成軸承光潔度下降,降低使用壽命,嚴重地造成直接損壞。損壞程度主要取決于軸電壓和存儲在電子轉(zhuǎn)子對地電容Crf的大小
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主營:世界知名品牌的PLC、DCS系統(tǒng)備件模塊
①Allen-Bradley(美國AB)系列產(chǎn)品》
②Schneider(施耐德電氣)系列產(chǎn)品》
③General electric(通用電氣)系列產(chǎn)品》
④Westinghouse(美國西屋)系列產(chǎn)品》
⑤SIEMENS(西門子系列產(chǎn)品)》
⑥銷售ABB Robots.FANUC Robots、YASKAWA Robots、KUKA Robots、Mitsubishi Robots、OTC Robots、PanasonicRobots、MOTOMAN Robots。
⑦estinghouse(西屋):OVATION系統(tǒng)、WDPF系統(tǒng)、MAX1000系統(tǒng)備件。
⑧Invensys Foxboro(福克斯波羅):I/A Series系統(tǒng),F(xiàn)BM(現(xiàn)場輸入/輸出模塊)
順序控制、梯形邏輯控制、事故追憶處理、數(shù)模轉(zhuǎn)換、輸入/輸出信號處理、數(shù)
據(jù)通信及處理等。Invensys Triconex:冗余容錯控制系統(tǒng)、基于三重模件冗余(TMR)
結(jié)構(gòu)的zui現(xiàn)代化的容錯控制器。
⑨Siemens(西門子):Siemens MOORE,Siemens Simatic C1,Siemens數(shù)控系統(tǒng)等。
⑩Bosch Rexroth(博世力士樂):Indramat,I/O模塊,PLC控制器,驅(qū)動模塊等。
◆Motorola(摩托羅拉):MVME 162、MVME 167、MVME1772、MVME177等系列。
ALLEN BRADLEY 1336F-BRF150-AA?-EN NEW 1336FBRF150AAEN
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Allen Bradley Operator Interface Terminal#6160PCD2CT60
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GuardLogix Logix5562 Processor with 4MB Std/1MB Sft Mem
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ALLEN-BRADLEY 513-DEBD-47 NEMA COMBINATION STARTER
*FS*Allen Bradley 2711P-T12C4D1/A PanelView Plus 1250
60 DAYS WARRANTY!PKG DATE 09/01/2010
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ALLEN BRADLEY DRIVE 75-HP 1336F-B075-AA-E?N-HCS2-LA1-L6
Allen-Bradley 1336 Plus AC Drive Controller 1336S(1924
Allen-Bradley 1336 Plus AC Drive Controller 1336S(1925
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ALLEN BRADLEY 1336E-BX040-AN-?EN-L9E USPP 1336EBX040ANEN
150A180NBD NEW ALLEN BRADLEY 150 A180NBD FREE SHIPPING
*NEW*Allen Bradley AB 2711P-T15C6D6/A 2711P-T15C4D6
60 DAYS WARRANTY!2711P-T15C4D6+2711P-RN6 07/06/2009
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ALLEN BRADLEY 1785-L40C15-NEW-1785L40C15
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ALLEN BRADLEY 6180-FLIFHLHTJE?Z USPP 6180FLIFHLHTJEZ
*NEW SEALED*Allen Bradley 1746-BLM/A 1746BLM 03/2009
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150A97NCD NEW ALLEN BRADLEY 150 A97NCD FREE SHIPPING
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1336S-B020-AA-E?N4-L6 ALLEN BRADLEY
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ALLEN BRADLEY 100-B600NA3 NSFP 100B600NA3
2711-T10C8 ALLEN BRADLEY
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1391-AA45-A06 ALLEN BRADLEY CONTROLLER*1YRWRTY*
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Allen Bradley AC Servo Motor FREE SHIPPING
Allen Bradley Bulletin AC Servo Motor FREE SHIPPING
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ALLEN BRADLEY 1336F-B020-AA-E?N-HAS1 NSFP 1336FB020AAENH
ALLEN BRADLEY 1232X-ENB-27R NSPP 1232XENB27R
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*NEW*AB Allen Bradley PanelView 900C#2711-K9C8 BNIB
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ALLEN BRADLEY 1775-MEA USPP 1775MEA
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ALLEN BRADLEY AC VARIABLE FREQUENCY DRIVE
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ALLEN BRADLEY SERVO DRIVE 2098-1PD-HV050
ALLEN BRADLEY SERVO MOTOR MPL-B660F-SJ22A?A
NEW Allen Bradley 2094-AC32-M05-S Kinetix 6000 Drive
Expedited shipping available
ALLEN BRADLEY 3400-TFS USPP 3400TFS
ALLEN BRADLEY 40 HP AC VFD DRIVE 1336F-BX040-AX-?EN-L6
Allen Bradley 8720SM-075S6SAS?1 Servo Motor