一、霍爾效應傳感器工作原理是什么
霍爾(er)傳(chuan)感(gan)器(qi)是根據霍爾(er)效應制作的(de)(de)一種(zhong)磁場(chang)傳(chuan)感(gan)器(qi),其工作原理(li)是霍爾(er)電(dian)(dian)(dian)壓(ya)隨磁場(chang)強度的(de)(de)變(bian)化而變(bian)化,磁場(chang)越強,電(dian)(dian)(dian)壓(ya)越高,磁場(chang)越弱,電(dian)(dian)(dian)壓(ya)越低(di)。霍爾(er)電(dian)(dian)(dian)壓(ya)值很小,通常只(zhi)有幾個毫伏,但經(jing)集成電(dian)(dian)(dian)路(lu)中(zhong)的(de)(de)放大(da)器(qi)放大(da),就能使(shi)該電(dian)(dian)(dian)壓(ya)放大(da)到足(zu)以輸(shu)出較強的(de)(de)信號。若使(shi)霍爾(er)集成電(dian)(dian)(dian)路(lu)起(qi)傳(chuan)感(gan)作用,需要(yao)用機械的(de)(de)方法來改變(bian)磁場(chang)強度。
用(yong)(yong)一個轉動(dong)(dong)的葉(xie)輪(lun)作(zuo)為控制磁通量的開關,當葉(xie)輪(lun)葉(xie)片(pian)處于磁鐵和霍爾(er)(er)集成電(dian)(dian)路之間的氣隙中時,磁場偏(pian)離集成片(pian),霍爾(er)(er)電(dian)(dian)壓消(xiao)失。這樣,霍爾(er)(er)集成電(dian)(dian)路的輸出電(dian)(dian)壓的變(bian)化,就(jiu)能(neng)表示出葉(xie)輪(lun)驅(qu)動(dong)(dong)軸的某(mou)一位置,利(li)用(yong)(yong)這一工(gong)作(zuo)原理,可將霍爾(er)(er)集成電(dian)(dian)路片(pian)用(yong)(yong)作(zuo)用(yong)(yong)點火正時傳感器(qi)(qi)。霍爾(er)(er)效應傳感器(qi)(qi)屬于被動(dong)(dong)型傳感器(qi)(qi),它要有(you)外加電(dian)(dian)源才能(neng)工(gong)作(zuo),這一特點使它能(neng)檢測轉速低的運轉情況。
二、霍爾效應傳感器有哪些特點
前文已經簡單了解了霍爾效應傳感器工作原理,接著咱們再來看看霍爾效應傳感器有哪些特點?
霍爾效應傳感器(qi)的特點是結構簡單、體積小、堅固、頻率(lv)響(xiang)(xiang)應寬(從直流到微波)、動(dong)態范圍(輸出電動(dong)勢的變化(hua)范圍)大(da)、無觸(chu)點、使用(yong)壽命長、可靠性高、易于(yu)微型化(hua)和集(ji)成化(hua)。但它的轉換率(lv)較(jiao)低(di),溫(wen)度(du)影(ying)響(xiang)(xiang)大(da),在要求轉換精度(du)較(jiao)高時必須進行溫(wen)度(du)補償。