Hall sensor yog ib qho khoom siv tsis tseem ceeb hauv lub tsheb. Nws qhov kev txiav txim yog raws li qhov kev nthuav dav pom hauv 1879 los ntawm American physicist E. Hall. Tom qab, qhov xwm txheej no tau muaj npe tom qab nws.
Cuab sensor ua haujlwm txoj hauv paus ntsiab lus
Kev ua haujlwm ntawm lub ntsuas hluav taws xob yog ua raws li Hall Hall effect. Nws muaj nyob rau hauv cov hauv qab no: yog tias ib lub tshuab hluav taws xob, nrog rau qhov hluav taws xob tam sim no ntws, muab tso rau hauv qhov chaw muaj hlau nplaum, qhov hloov pauv uas muaj qhov sib txawv (qhov hluav taws xob) yuav tshwm sim. Qhov hluav taws xob no yog hu ua Hall voltage. Nws tuaj yeem muaj los ntawm kaum tawm microvolts txog ntau pua millivolts. Thaum lub sijhawm nrhiav pom ntawm Hall cov nyhuv, tsis muaj ib daim ntawv thov kev lag luam rau nws. Tsuas yog 75 xyoo tom qab, cov duab yeeb yaj kiab (semiconductor) nyias tau tsim uas muaj cov khoom xav tau. Nrog lawv cov kev pab, Hall sensor tau tsim.
Thawj cov cim no muaj xws li cov hlau nplaum tas li, lub rotor hniav, cov khoom sib nqus, lub microcircuit thiab ob tus coj. Nws muaj nqis heev. Nws yooj yim heev rau kev tswj hwm. Thaum lub teeb liab raug thov rau nws cov kev nkag, ib txoj hauv kev muaj mem tes, tas li hauv lub sijhawm, zoo nkaus li, tsis muaj qhov muaj zog tshaj. Cov paib no muaj qhov ntev me me (ntawm kev txiav txim siab ntawm lub micrometer). Zoo ib yam li microcircuit, nws muaj nws cov qhov tsis zoo: rhiab mus rau kev hloov pauv ntawm thaj chaw hluav taws xob thiab tus nqi siab heev.
Hall sensors tuaj yeem yog analog thiab digital. Cov qub yog siv los hloov qhov induction ntawm kev sib nqus thaj chaw rau hauv voltage. Cov chaw digital txiav txim siab pom tias muaj lossis tsis muaj dab tsi nyob hauv ib cheeb tsam muab. Yog hais tias daim teb induction nce mus txog qee yam kom muaj nuj nqis, cov zis tawm ntawm lub pa hluav taws xob yuav yog chav pov thawj, yog tias nws tsis ncav lub pov thawj xoom. Ob qho tib si analog thiab digital sensors paub qhov transverse muaj peev xwm sib txawv uas tshwm sim thaum lub teb chaw sib nqus tau siv rau lub tshuab hluav taws xob tam sim no.
Cov ntawv thov lub sensor nrog
Thaum pib, Hall sensor tau siv rau hauv kev lag luam tsheb. Nrog nws cov kev pab, lub kaum sab xis ntawm crankshaft lossis camshaft txoj hauj lwm yog txiav txim siab. Hauv cov tsheb qub, nws siv los tsim kom muaj lub teeb liab hluav taws xob.
Hall sensors yog dav siv nyob rau hauv kev tsim khoom ntawm ammeters muaj peev xwm ntawm ntes tam sim no los ntawm 250 mA rau txhiab tus amperes. Nrog kev pab ntawm cov ntsuas hluav taws xob nws muaj peev xwm ntsuas lub zog ntawm kev ncaj qha thiab hloov tam sim no ntawm kev loj. Hauv qhov no, nws yuav muaj qhov sib npaug nrog qhov sib txuam ntawm qhov chaw sib nqus, uas tau ntxias los ntawm qhov tam sim no dhau ntawm tus neeg xyuas pib.
Hall sensors yog siv rau hauv kev tsim cov tshuab electromechanical, lub tshuab tshwj xeeb kom ntseeg tau tias kev ua haujlwm ntawm cov actuators hauv cov chaw tsim khoom thiab nroj tsuag. Hauv qhov xwm txheej no, cov piav qhia yuav hloov kho qhov tseeb ntawm lub tshuab.
