1756-L7SP

1756-L7SP電流采樣一般采用的是在回路中串入電阻，利用安培定理，檢測電阻上的壓降來得到流過電阻的電流。采樣電阻比較精密，并且阻值比較小，一般為0.01～0.1Ω左右。由于被檢測的電流的幅值較大，所以所需要的采樣電阻的功率也較大，體積也較大。為了減小控制器的體積，本次設(shè)計采用的是ACS712(或***CH701)線性霍爾電流傳感器。

傳感器的內(nèi)部集成有一個、低偏置和線性的霍爾傳感器。當(dāng)霍爾傳感器檢測到由于銅導(dǎo)路徑電流流過而產(chǎn)生的磁場時，將其轉(zhuǎn)化為成比例的電壓。此傳感器可以流過的電流大為5A，內(nèi)部銅導(dǎo)路徑的阻抗為1.2mΩ，所以功率損失比較小。

傳感器在沒有電流流過時，輸出端口的電壓為供電電壓的50%，精度為0.185V/A。采樣得到的輸出電壓，需要經(jīng)過放大器的變換，輸入到DSP的AD模塊。電流采樣模塊主要用來實現(xiàn)對步進(jìn)電機兩相電流的采樣，從而構(gòu)成電流閉環(huán)，提高控制的精度和響應(yīng)速度。

Allen Bradley SLC100 PLC 1745-E105

ALLEN BRADLEY 1745-C1 SER. B CABLE NEW 1745C1

ALLEN-BRADLEY 1745-LP153 SLC 150 Processor Unit ! WOW !

Allen-Bradley 1745-E105/C SLC 100 Relay Expansion Unit

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NS** ALLEN-BRADLEY 1745-E153 SLC 150 EXPANSION UNIT

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Allen Bradley 1745-E151 SLC Expansion Unit #21209

Allen Bradley 1745-E151 SLC Expansion Unit #21213

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ALLEN BRADLEY 1745-E101 SERIES A SLC100 EXPANSION I/O

Allen Bradley 1745-E151 SLC Expansion Unit #21214

NEW ALLEN BRADLEY 1745-E106 PROGRAMMABLE CONTROLLER

ALLEN BRADLEY 1745-M1 MEMORY MODULE NEW IN BOX

ALLEN-BRADLEY 1745-E106 SLC 100 Programmable Controller

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ALLEN BRADLEY 1745-E101 USPP 1745E101

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AB SLC150 1745-LP151 Ser C FRN6 Allen Bradley Prog. Co

Allen-Bradley SLC 150 1745-LP151 Processor Unit 

ALLEN BRADLEY 1745-E153 SER. A EXPANSION 1745E153 NIB

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Allen Bradley 1745-LP153 SLC 150 Processor Unit

ALLEN BRADLEY 1745-LP101 SLC 100 PROGRAMMABLE CONT*XLNT

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ALLEN-BRADLEY 1745-E151 SLC 150 Expansion Unit ! WOW !

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1745-LP153 Allen Bradley SLC 150 1745LP153 N835

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1745-LP101 Allen Bradley SLC 100 Exp Unit 1745LP101

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New Allen Bradley Memory Module 1745-M1 1745M1 Ser B

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Allen Bradley #1745-LP101 I/O Module Fixed (U) ABS/9

Allen Bradley SLC150 Expansion Unit 1745-E153 Series A

1745-B1 Battery for ALLEN BRADLEY 1745-LP15 1745-LP152

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Allen Bradley 1745-LP151 SER C FRN6

Used Allen Bradley, 1745-E153 SLC150 Expansion Unit

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Allen Bradley SLC 100 Expansion Unit 1745-E101

ALLEN BRADLEY 1745-M1 MEMORY MODULE NEW IN BOX

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New in Box 1745-LP156/C Allen Bradley SLC 150 1745LP156

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