描述
在分析開關(guān)變壓器的工作原理的時候,必然會涉及磁場強度H和磁感應(yīng)強度B以及磁通量等概念,為此,這里我們首先簡單介紹它們的定義和概念。
在自然界中無處不存在電場和磁場,在帶電物體的周圍必然會存在電場,在電場的作用下,周圍的物體都會感應(yīng)帶電;同樣在帶磁物體的周圍必然會存在磁場,在磁場的作用下,周圍的物體也都會被感應(yīng)產(chǎn)生磁通。
現(xiàn)代磁學(xué)研究表明:一切磁現(xiàn)象都起源于電流。磁性材料或磁感應(yīng)也不例外,鐵磁現(xiàn)象的起源是由于材料內(nèi)部原子核外電子運動形成的微電流,亦稱分子電流,這些微電流的集合效應(yīng)使得材料對外呈現(xiàn)各種各樣的宏觀磁特性。因為每一個微電流都產(chǎn)生磁效應(yīng),所以把一個單位微電流稱為一個磁偶極子。因此,磁場強度的大小與磁偶極子的分布有關(guān)。
在宏觀條件下,磁場強度可以定義為空間某處磁場的大小。我們知道,電場強度的概念是用單位電荷在電場中所產(chǎn)生的作用力來定義的,而在磁場中就很難找到一個類似于“單位電荷”或“單位磁場”的帶磁物質(zhì)來定義磁場強度,為此,電場強度的定義只好借用流過單位長度導(dǎo)體電流的概念來定義磁場強度,但這個概念本應(yīng)該是用來定義電磁感應(yīng)強度的,因為電磁場是可以互相產(chǎn)生感應(yīng)的。
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主營DCS系統(tǒng)配件
機器人系統(tǒng)配件
大型伺服系統(tǒng)配件
品牌:ABB???,AB??,GE,FOXBORO,本特利,英維思,伍德沃德,西屋,瑞恩,施耐德,西門子,摩托羅拉,安川。力士樂。ACSO,橫河等進(jìn)口品牌。 專業(yè)銷售進(jìn)口DCS? PLC系統(tǒng)備件模塊
Triconex?Siemens?Yaskawa?ABB?GE?Ovation?AB?Foxboro?Motorola?Schneider?XYCOM?KUKA ? 專業(yè)銷售進(jìn)口DCS? PLC系統(tǒng)備件模塊 15天包退換 一年質(zhì)保 大量現(xiàn)貨? 國內(nèi)實力庫存商家
TAYLOR ABB MOD 300 CONTROLLER BOARD 6051NA10424
TAYLOR ABB MOD 300 I/O EXT. 6216BZ10000
TAYLOR ABB MOD 300 DCN INT. 6253BZ10000
TAYLOR ABB MOD 300 CNTLR FAN ASSY P/N: 6215FZ10100
TAYLOR ABB MOD 300 BCKUP MEM MODULE 6014BZ10100
TAYLOR ABB MOD 300 I/O EXT. MODULE 6016BZ10000
TAYLOR ABB MOD 300 DIGITAL CONTROLLER BD 6050NA10424
PCA984145 PC-A984-145 MODICON CPU MODULE
TAYLOR ABB MOD 300 SIM MODULE 6010BZ10000
Simplex Fire Alarm Model 4120 POWER SUPPLY 562-974
XF523A HONEYWELL INPUT MODULE XF523A
AS-BADU-206 MODICON INPUT MODULE ASBADU206
550-405 SIEMENS LANDIS /GYR ATEC VAV 550405
550-405 SIEMENS LANDIS /GYR ATEC VAV **NEW** 550405
140-CPU-113-03 MODICON CPU MODULE NIB 140CPU11303
545-791 SIEMENS NETWORK ENCLOSURE BRAND NEW 545791
Simplex Fire Alarm Model 4120 MTHRDBD CLASS B 562-856
AM-S980-830 MODICON NETWORK CONTROLLER AMS980830
SIEMENS/LANDIS & GYR – 538-665 538665 TRUNK INTERFACE
Simplex Fire Alarm Model 4120 LED/SWITCH CONT. 562-729
TSXWMY100 MODICON TSX PREMIUM FCHMI MODULE
TAYLOR ABB MOD 300 PROCESSOR 6024BZ10300
TAYLOR ABB MOD 300 TRANSFER MODULE 6215BZ10000
6EP13311SL11 SIEMENS POWER SUPPLY 6EP1 331-1SL11
AS-BDEO-216 MODICON INPUT MODULE ASBDEO216
AS-BDAP-220 MODICON NEW FACTORY SEALED ASBDAP220
TAYLOR ABB MOD 300 FIELD BUS MODULE 6227BZ10200
TAYLOR ABB MOD 300 CPU 6024BZ10101
ALLEN BRADLEY 1771-A1B B 1771A1BB 4 Slot I/O CHASIS
Simplex Fire Alarm Model 4120 SIGNAL ZAM 562-617
140-CRP-931-00 MODICON QUANTUM PROCESSOR 140CRP93100
NW-RR85-001 MODICON REPEATER NWRR85001
AS-BDAP-253 MODICON MODULE RELAY ASBDAP253
AS-BDEP-257 MODICON I/O MODULE ASBDEP257
14506471 HONEYWELL EXCEL PLUS POWER SUPPLY 1450 6471
14506052-001 HONEYWELL EXCEL PLUS TERM. BD. 1450605201
ACI/CO-2075-D CO SENSOR POLYGARD CO AT-1110 NEW
AUTOMATION COMPONENTS ACI/1K-2W-I-4″-?EH NEW
AUTOMATION COMPONENTS SENSOR ACI/100KS-O NEW
AUTOMATION COMPONENTS SENSOR ACI/375-I-2.5″ NEW
AUTOMATION COMPONENTS RH SENSOR ACI/RH3-TTM1K-D
AUTOMATION COMPONENTS SENSOR ACI/1K-2W-RS
ACI/CO-2075-R CO SENSOR POLYGARD CO AT-1110 NEW
AUTOMATION COMPONENTS ACI/1K-3W-S NEW
ACI/PG-RH2-TTM1?K-RP-20 AUTOMATION COMPONENTS RH SENSOR
490NRP25400 MODICON FIBER OPTIC REPEATER 490-NRP-25-400
Allen Bradley 1747-L511 Series B Processor 1747L511
MODICON AS-J892-101 NEW SURPLUS ASJ892101
MODICON TSX QUANTUM 140 DRC 830 00 140DRC83000
MODICON TSX QUANTUM 140 CPS 124 00 140CPS12400
AS-E908-131 MODICON MEMORY MODULE ASE908131
140-DDO-353-01 MODICON TSX QUANTUM 140DDO35301
ABB MOD 300 BULK POWER SUPPLY 6024NR14130
MODICON TSX QUANTUM 140DDO15310 5 VDC 140 DDO 153 10
AS-BADU-205 MODICON INPUT MODULE ASBADU205
MODICON TSX QUANTUM IFC020 RESOLVER INPUT
PC-E984-275 MODICON CPU MODULE PCE984275
TAYLOR ABB MOD 300 D/M MODULE 6009BZ10000
TAYLOR ABB MOD 300 VIDEO MODULE 6008BZ10000
TAYLOR ABB MOD 300 PROCESSOR MODULE 6024BP10300
MODICON AS-B872-002 ASB872002 ANALOG OUTPUT MODULE
TAYLOR ABB MOD 300 SERIAL I/O MODULE 6007BG10000
SIEMENS/LANDIS & GYR – 544-381 544381 UC BACKPLANE BRD
TAYLOR ABB MOD 300 F-BUS INTERFACE 6203BZ10000
ABB MOD 300 FIELD BUS MODULE 2-CHANNEL P/N 6204BZ10200
ABB MOD 300 I/O XFER MODULE P/N 6215BZ10000
1746-NO4V ALLEN BRADLEY OUTPUT MODULE 1746NO4V
140-ACI-030-00 MODICON TSX QUANTUM 140ACI03000
MODICON AS-B875-111 REM ASB875111 ANALOG INPUT MODULE
545-703 SIEMENS/LANDIS & GYR POWER MODULE 545703
TSXETZ410 MODICON COMMUNICATION MODULE
SIEMENS PTM62I420 LANDIS & GYR – PTM6.2I420
538-955 SIEMENS TRUNK ISOLATOR/EXTEND?ER 538955
TAYLOR ABB MOD 300 D/F MODULE 6005BZ10000
XI581AH HONEYWELL XL500 OPERATOR TERMINAL
545-487 SIEMENS SCU V5 CONTROLLER 545487
Allen Bradley 1203-SM1 Ser. A Scanport Module 1203SM1
XF529 HONEYWELL XL500 MODULE OUTPUT
CM900 DATALOGIC AUTOID MODULE
AS-BDEP-214 MODICON INPUT MODULE ASBDEP214
HONEYWELL XL500 Blank Housing Cover
AS-B873-001 MODICON ANALOG INPUT MODULE ASB873001
SIEMENS PTM62N100K LANDIS & GYR – PTM6.2N100K NIB
SIEMENS PTM62Q250 LANDIS & GYR – PTM6.2Q250
SIEMENS PTM62Q250M LANDIS & GYR – PTM6.2Q250-M
SIEMENS PTM62Y420 LANDIS & GYR – PTM6.2Y420
SIEMENS PTM64D20 LANDIS & GYR – PTM6.4D20
TAYLOR ABB MOD 300 CPU 6204BZ10100
MODICON AS-BDEP-210 ASBDEP210
AS-B882-032 MODICON OUTPUT MODULE ASB882032
140-AVI-030-00 MODICON INPUT MODULE 140AVI03000
140-ATI-030-00 MODICON INPUT MODULE 140ATI03000
ALLEN BRADLEY 1771-P4S B 1771P4SB POWER SUPPLY
SIEMENS 545 701LANDIS & GYR 545-701 PRE APOGEE 545701
SIEMENS 545701 LANDIS & GYR 545-701 PRE APOGEE 545 701
MODICON PC-E984-385 PCE984385 PROGRAMMABLE CONTROLLER
Simplex Fire Alarm Model 4120 AUDIO BD ASSY 562-894
Simplex Fire Alarm Model 4120 MTHBD 565-274
MODICON TSX QUANTUM 140 ACO 020 00 140ACO02000
MODICON AS-BDEP-216 ASBDEP216 AEG 16 POINT INPUT 24VDC
LANDIS & GYR – 536-765 V4 O.S. 12.2
SIEMENS/LANDIS & GYR – 533-500 MFC LINE CARD
140-DAO-842-10 MODICON OUTPUT MODULE NOB 140DAO84210
LANDIS & GYR – 533-660 SCU ANALOG OUTPUT
SIEMENS/LANDIS & GYR – 533-665 533665 SCU
SIEMENS/LANDIS & GYR – 534-295 534295
SIEMENS/LANDIS & GYR – 535-111 535111
SIEMENS/LANDIS & GYR – 545-715 O.S. 1.41
SIEMENS APOGEE – 545-715 O.S. 2.3
SIEMENS/LANDIS & GYR – 545-719 O.S. 1.3
SIEMENS APOGEE – 545-719 O.S. 2.3
SIEMENS/LANDIS & GYR – 545-719 O.S. 2.4
PE0001000 POWER SUPPLY MODULE 24VDC OUTPUT PE-0001-000
SIEMENS/LANDIS & GYR – 529-015 529015
SIEMENS/LANDIS & GYR – 529-610 529610 POWER SUPPLY
SIEMENS/LANDIS & GYR – 529-620 529620 OUTPUT PICKET
SIEMENS/LANDIS & GYR – 529-625 529625 INPUT PICKET
AS-BDAU-202 MODICON ANALOG OUTPUT MODULE ASBDAU202
SIEMENS/LANDIS & GYR – 529-720 529720 OUTPUT CARD
1747-L542 ALLEN BRADLEY CPU MODULE 1747L542
SIEMENS/LANDIS & GYR – 531-650 531650 OUTPUT CARD
SIEMENS LANDIS & GYR – 533-255 533255 OUTPUT CARD
140-DDI-841-00 MODICON TSX QUANTUM 140DDI84100
SIEMENS/LANDIS & GYR – 544-110 544110 PROCESSOR CARD
XF524A HONEYWELL INPUT MODULE XF524A
PLC模塊,可編程控制器,CPU模塊,IO模塊,AI模塊,通訊模塊。AB/施耐德/ABB/GE/本特利/西屋/英維斯/霍尼韋爾/黑馬/FU克斯波羅
15天包退換 一年質(zhì)保 大量現(xiàn)貨? 國內(nèi)實力庫存商家