BK4020

BK4020 

无刷直流电机的工作原理本质上与有刷电机类似，有刷直流电机采用机械的电刷和换向器对绕组中的电流进行换向。而无刷电机采用电子方式对绕组电流换向。

直流电机中转矩是通过永磁体磁场和绕组中的电流相互作用产生的，在有刷电机中，换向器通过切换电枢绕组实现电枢电流的换向与合适的磁场。而无刷直流电机中，霍尔位置传感器探测转子旋转磁场的位置，通过逻辑与驱动电路，给相应的绕组激励。总的说来，绕组根据电机永磁体的磁场作出反应，从而产生需要的转矩。如图1是一种三相8极(四对磁极)无刷直流电机基本组成：

BK4020 

SORVALL Centrifuge H-12000 swinging-bucket rotor 

PACKETEER PacketSeeker 8500 PS8500-L000M 

Lot of 450pcs Xilinx XC4005XL-09VQ100C $7/pc 

MAGTRON MBSEQ100 DRILL 1800W 230V  Spare

NERA F77 Transceiver Unit & Modem Unit Repaired Spare

HP Agilent 5517D Laser Head C16 refurbished

KOPASS JUPITER COMPASS TYP 2060 Northrop Grumman 

AMAT 0242-28381 0200-02272 0200-02980 0200-02981

SAM ELECTRONICS DS05-IMB GE3044G205 Sonar Submarine

SAM ELECTRONICS HS04-RSC10T GE3044G201 RSC Signal Card

SIEMENS 6AV6381-1BH06-2AX0 SIMATIC WinCC V6.2 8192 TAG

 ABB ABB800 PM825 processor module of the AC80

Wipro Infrastructure Hydraulic Cylinder P-5339 P5339

NORTEL NTHW08CG MSS 15000 Control Processor CP3 Module

DLPCinema 1.25-1.45:1 High Brightness Len 108-274101-01

Cooper Cleco 67ES285D6 Netsetter Inline Fixed Spindle

Cooper Cleco 67ES285D6 Netsetter Inline Fixed Spindle

Ferraz Shawmut Y075760 D2302GE20C400QF 2000V 400A FUSE

Nortel Multiservice Switch 15000 SHELF  Spare

NSK HR32060XJ Taper Bearings 

Cooper Cleco STMHE for TMEM TME Controller Refurbished

DLPCinema 1.45-2.05:1 High Brightness Len 108-335102-01

SAMSUNG SVDR Voyage Data Recorder part ROMU-3000A 

GUTOR 640-4049A Rev 2 Controller Board 0P0360 

 Alcatel SERV 3DB02155AA

USSI N21260605 IN OUT Board Ansaldo 

IPC Alliance MX DCIC Card 

IPC Alliance MX ALIC Card 

Seica circuit tester board PT-DMAST100-00 Refurbished

Wonderware InTouch Development 1000 Tag FS2000/9.0 

RICOH Z-folding Unit ZF-4000 for MP6000 MP7000 MP8000

NORTEL NTHW08CA Mss 15000 Control Processor (cp3) Modul

 NIDEC SANKYO SC3150 Robot Controller 200/230vAC 

ALFA LAVAL Decanter Core Controller 6121.1227-01

Cisco Unified Communications Manager CM6.1U4-K9-UPG=

Lot 2K Atmel ATA5743P3-TGQY ATA5743 UHF Receiver $1.25p

CG171A-T003-05 Reflector Film UX188 etching mould USED

Motorola STARLINE SG2000 Optical Node 415239-333-00 

PELCO Esprit ES31CBW24-2W-X IOP 24X High Res PAL

Lot 80 CY7C1414SV18-250BZC CY7C1414 Chips $29/each

Honeywell 24 Beam Light curtain Control FF-LS242806842

Agilent G3431-60531 FID EPC Manifold 

RICOH SR842 finisher stapler for MP6000 MP7000 MP8000

Emerson Force PowerCore CPCI-6750/128S-400-L

VUTEk 3360 Controller Board Assy AA90206 Rev B 

Shimadzu GC-14A GAS CHROMATOGRAPH USED SPL FID install

Nortel NTN063FM S18K DDM 900 Filter 190-CY127-F1V5

lot 520 iKANOS Fusiv IKF68331-A1-PB1-C chips $4/each

Alcatel 3AL97690AA LC-ESC board 

LUCENT PCBR850-PredistortionCDMA Baseband RADIO 44WR87

MacGREGOR C000071 cabin display Crane Computer CCP XS

Cooper Cleco STMH for TMEM TME Controller Refurbished

Repaired Marconi LB16BG Board PLT40 UNPORT TRANS 2.5GB

SIEMENS SIVOLT-A-Drehstromsteller 40A 6SG2412-3CA00-Z

SAM ELECTRONICS HS10 Pulse Modulator NG3028G206 25KW

SAM ELECTRONICS HS06-TCU NG3028G201 Board 

lot of 2500 LINEAR LTC1430CS#TR Voltage Regulator chips