140HLI34000C Quantum

無(wú)傳感器 BLDC 電機(jī)利用電動(dòng)勢(shì) （EMF） 在任何直流電機(jī)的繞組中產(chǎn)生電流，其磁場(chǎng)與楞次定律所描述的磁通量的原始變化相反。EMF 傾向于抵抗電機(jī)的旋轉(zhuǎn)，因此被稱(chēng)為“反”EMF。對(duì)于具有固定磁通量和繞組數(shù)量的給定電機(jī)，EMF 與轉(zhuǎn)子的角速度成正比。

　　通過(guò)監(jiān)控反電動(dòng)勢(shì)，經(jīng)過(guò)適當(dāng)編程的微控制器可以確定定子和轉(zhuǎn)子的相對(duì)位置，而無(wú)需霍爾效應(yīng)傳感器。這簡(jiǎn)化了電機(jī)結(jié)構(gòu)，降低了成本，并了支持傳感器所需的額外接線(xiàn)和電機(jī)連接，從而提高了可靠性。

　　然而，由于靜止電機(jī)不產(chǎn)生反電動(dòng)勢(shì)，控制器無(wú)法在啟動(dòng)時(shí)確定電機(jī)位置。解決方案是以開(kāi)環(huán)配置啟動(dòng)電機(jī)，直到產(chǎn)生足夠的 EMF 供控制器確定轉(zhuǎn)子和定子位置，然后接管監(jiān)控。如果電機(jī)用于禁止反向旋轉(zhuǎn)的應(yīng)用，則使用更復(fù)雜的控制機(jī)制。

　　上述 BLDC 電機(jī)的每個(gè)繞組產(chǎn)生的反電動(dòng)勢(shì)如圖 5 的下半部分所示。這與配備傳感器的可比 BLDC 電機(jī)的霍爾效應(yīng)傳感器邏輯開(kāi)關(guān)輸出進(jìn)行了比較。從圖中可以看出，繞組中產(chǎn)生的電動(dòng)勢(shì)的零交叉點(diǎn)與邏輯開(kāi)關(guān)的開(kāi)關(guān)狀態(tài)變化相吻合。微控制器使用這種過(guò)零信息來(lái)觸發(fā)無(wú)傳感器 BLDC 電機(jī)中換向周期的每個(gè)階段。（請(qǐng)參閱圖書(shū)館文章“通過(guò)反電動(dòng)勢(shì)控制無(wú)傳感器、BLDC 電機(jī)”。）

Cognex 4300 Vision board - for GSI M310 laser system

Cognex In-Sight 5000 IS5000-00 800-5840-4 Vision Sensor

COGNEX VPM8100VS-000-P Rev.A OPT:A PCI Card 

COGNEX LED RING LIGHT CLM 4236

Cognex In-Sight 5100 Series IS5100-10C

New Cognex Machine Vision Camera In-Sight 5400

Cognex Insight 5100 Vision System

COGNEX VM16A 203-0075-RE ISA BUS VISION BOARD

COGNEX VISION SYSTEM 4400,VBM-4438-133

Cognex In-Sight Set of 2

COGNEX VISION CONTROL BOARD VPM-8100LX-000 REV:A OPT:A

Cognex in sight 1000 vision camera 

NEW Cognex 300-0341-15 Cable NSFP 300034115

COGNEX 4300,VPM-4334-00 VISION SERIES BOARD

COGNEX 300-0274-7 VISION PROCESSOR TERMINAL CABLE

COGNEX MVS 8100 Frame Grabber Whit SONY XC-75 Camera 

Cognex In-Sight 5100 Series IS5110-00C

Cognex In-Sight 1701

1 NIB COGNEX CLM-LDLTP51X51-00 CLMLDLTP51X5100 MODULE

NEW COGNEX CABLE 185-0264R CCB-84901-0901-02

Cognex CLM 4260 Light Ring, NEW in Box, 4" LED

COGNEX IN-SIGHT 5400 VISION CAMERA ISS-5400-0000

Cognex Machine Vision System Checkpoint 400

Cognex In-Sight IS5100-00, In-Sight Vision Camera

USED Cognex Camera System LOT CKR-232-002 CKR-200-IOBOX

Cognex In-Sight I/O Expansion Module, Break Out Box

COGNEX CHECKER 101 807-0007-2 REV C VISION CAMERA

COGNEX IN-SIGHT VISION SYSTEM 800-5809-1 807-9003-1R ++

Cognex In-Sight 1000, In-Sight Vision Camera, 800-5740

Cognex Checker 101 Vision Sensor 807-0007-2 REV B

COGNEX CHECKER 101 807-0007-2 REV A VISION CAMERA

CCS PD-3012 LED Vision Light Power Supply, Cognex, Dual

COGNEX VME 4400 SERIES VPM-4418-002 MACHINE VISION 

Cognex 300-0232-015R Rev.A , 4 CH. Camera Cable

Cognex Vision Lighting Cable, CLA-CB5-00, NEW

COGNEX IN-SIGHT 1000 VISION SENSOR 2 COMPLETE SETS NEW

Cognex Checker 101 807-0004-5 Rev. F 8O7-OOO4-5 150 MA

CCS PB-2430 LED Vision Light Power Supply, Cognex, Dual

Cognex In-Sight 5100 Series I/O Expan. Module CIO-1460

Cognex Checker DIN Rail Mount Interface 800-5888-2 B

COGNEX VISION SYTEM IN-SIGHT-3400 CAMERA MODULE

COGNEX LED BackLight Red IARB-040424 24vdc Adv Illu 162

COGNEX 800-5712-2 A Vision Processor I/O Module *NIB*

cognex checker 101 vision sensor

COGNEX IN-SIGHT 1701 WAFER READER

Cognex MVS 8100 Frame Grabber VPM-8100S-000 Rev A Opt A

Cognex 1500 VB1 ASP-1502-220 4-channel Vision System

Cognex In-Sight 5100 Series cable 185-0265 rev A

Cognex In-Sight 1000 Break Out Box, Excellent Condition

Cognex In-sight 2000 Insight Machine Vision Controller

Cognex In-Sight 4100 PN: 800-5763-1 Rev E 

Cognex Vision Applied Kinetics model SAZ V6.1 & Camera

Cognex In-Sight 4100 800-5763-1 Rev 2

COGNEX IN-SIGHT 2000 800-5714-1 REV G VISION SYSTEM

COGNEX VISION LASER CAMERA VPM-8100LVQ-000-P NEW (NIB)

CAMERA Cable for COGNEX 300-0135 REV.B ACT 814

Cognex In-Sight model 1010 Vision Sensor 800-5749-1

COGNEX DVT LEGEND 630-C3E40 SMART IMAGE SENSOR CAMERA

Cable for COGNEX CAMERA 300-0135 REV.B AI

COGNEX 300-0135 Rev B AI/FOCS Camera cable 

Cognex 014204-020 Machine Vision Overlay Card Imagraph

Cognex In-Sight 1000 Break Out Box vison

Cognex LED Light CLM-DFLDR70A-00 119-0099 new

Used Cognex Vision Process Module Card VPM-8120X-5061-P

Cognex In-Sight 4100 800-5763-1 Rev B

Cognex DM100-IOBOX-000 Expansion Module - NEW

Cognex 300-0232-015R Rev.B1 , 4 CH. Camera Cable

Cognex In-Sight 5100 Series cable 185-0253 rev A

Cognex Dataman DM 7550 LR USB Cordless DPM 2D Reader

Cognex 300-0132 Rev B RIBBON CABLE 40 PIN CONNECTOR 

COGNEX 800-5741-1 MODEL IN-SIGHT 1000 SENSOR ***XLNT***

IFP 08 P-24-56A-1 for COGNEX 2004 PCB

Cognex VISION SYSTEM INSIGHT 4000 W/CABLE and IO Module

CDN366-2 & 300-0277-08 COGNEX DEVICENET CONVERTOR&CABLE

Cognex 800-5740-1 Rev. K In-Sight 1000 Processor Camera

Cognex 300-0107 Rev B Serial Port 

Cognex In-Sight 1000, 800-5740-1,camera w/35mm lens

Cognex In-Sight 4000 Cognex 800-5762-1 Vision Camera

Cognex I/O Expansion Module 800-5758-1 Revision J

COGNEX 4100 VISION SERIES BOARD

Cognex 82403/pci 400MH/64MB Vision Processor Module

DVT Cognex smart light array IDIA LED module

COGNEX 8110-CVM6-32 VISION PROCESSOR CARD FRAME GRABBER

Broken Cognex Dataman DM 7500 USB DPM 2D ID Reader

RVSI COGNEX VISION INTERFACE BOARD

Cognex In-Sight model 1000 Vision Sensor 800-5749-1

Cognex 300-0277-08 Rev A In-Sight Serial Adapter

Cognex Checker Rail Mount Interface 800-5888-2B 

Used Cognex Vision Process Module Card VPM-8120X-5061-P

ALPHASEM COGNEX FRAME GRABBER 8120 CVM9

Cognex P/N 800-5637-1 

Cognex Vision Processor 800-5712-2 B 200-0142-1 D

COGNEX DMR-100Q

COGNEX 300-0341-15 NEW 300034115

Cognex Monitor Display Screen CTM-ENET-104 

New COGNEX Expansion Module CIO-1400 800-9012-2R

Cognex Camera Insite 4000

DVT/Cognex Color Inspection Camera 542C

Cognex In-Sight 5100 Series cable 185-0248 rev A

Cognex Cable 300-0099-15 New

Cognex KV-7100N-PKG-E 7000-0015-01

Cognex Cable 300-0099-15 Used

COGNEX VISION CONTROL 4400 FRAME GRABBER 44124-003 MODU

Cognex 4000-9901 Camera Control Panel Box Enclosure

COGNEX ISS-5400-0000 USPP ISS54000000

Cognex VPM-59416-00S Vision System 

FUJI 4800 VME:48316-32F VISION CONTROL BOARD BY COGNEX

Cognex In-sight 1010 800-5749-1 Breakout Module Q new

Cognex CCs PD2-3024-00 New IN Box

COGNEX 4400 FRAME GRABBER 44124-003 MODULE

COGNEX MACHINE VISION VME-4418-1MX PROCESSOR MODULE

Cognex ADC-1460 P/N 185-0221 

FUJI VME 4800 VISION CONTROL BOARD FRAME GRABBER COGNEX

Used Cognex Vision Process Module Card VPM-8120X-5091-P

PVC-3 0401 20001361 A (Cognex?)

COGNEX 4400 VISION CONTROL BOARD FRAME GRABBER 4438-002

CKR-202-002 Cognex Checker 202 with IO Box cable

Cognex 800-0037-2 Rev B

Cognex VPM-59432-20GS Vision Module

1 NIB COGNEX 800-5758-1 80057581 I/O EXPANSION MODULE

Cognex DVT Legend 542C Color SmartImage Sensor 542 C

COGNEX CLM-2420-00 NSFP CLM242000