力士樂(lè)REXROTH壓力傳感器/力士樂(lè)電磁閥
REXROTH壓力傳感器從機(jī)械接收原理來(lái)說(shuō)，是一個(gè)位移傳感器，由于在機(jī)電變換原理中應(yīng)用的是電磁感應(yīng)電律，其產(chǎn)生的電動(dòng)勢(shì)同被測(cè)振動(dòng)速度成正比，所以它實(shí)際上是一個(gè)速度傳感器。
REXROTH壓力傳感器是一種相對(duì)式非接觸式傳感器，它是通過(guò)傳感器端部與被測(cè)物體之間的距離變化來(lái)測(cè)量物體的振動(dòng)位移或幅值的。電渦流傳感器具有頻率范圍寬（0～10 kHZ），線性工作范圍大、靈敏度高以及非接觸式測(cè)量等優(yōu)點(diǎn)，主要應(yīng)用于靜位移的測(cè)量、振動(dòng)位移的測(cè)量、旋轉(zhuǎn)機(jī)械中監(jiān)測(cè)轉(zhuǎn)軸的振動(dòng)測(cè)量。依據(jù)REXROTH壓力傳感器的相對(duì)式機(jī)械接收原理，電感式傳感器能把被測(cè)的機(jī)械振動(dòng)參數(shù)的變化轉(zhuǎn)換成為電參量信號(hào)的變化。因此，電感傳感器有二種形式，一是可變間隙，二是可變導(dǎo)磁面積。
德國(guó)博世力士樂(lè)壓力傳感器|壓力繼電器
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REXROTH壓力傳感器一般分為兩種類(lèi)型。即可變間隙式和可變公共面積式?？勺冮g隙式可以測(cè)量直線振動(dòng)的位移?？勺兠娣e式可以測(cè)量扭轉(zhuǎn)振動(dòng)的角位移。
REXROTH壓力傳感器由固定部分、可動(dòng)部分以及支承彈簧部分所組成。為了使傳感器工作在位移傳感器狀態(tài)，其可動(dòng)部分的質(zhì)量應(yīng)該足夠的大，而支承彈簧的剛度應(yīng)該足夠的小，也就是讓傳感器具有足夠低的固有頻率。 根據(jù)電磁感應(yīng)定律，感應(yīng)電動(dòng)勢(shì)為：u=Blx&r 式中B為磁通密度，l為線圈在磁場(chǎng)內(nèi)的有效長(zhǎng)度， r x&為線圈在磁場(chǎng)中的相對(duì)速度。 從傳感器的結(jié)構(gòu)上來(lái)說(shuō)，慣性式電動(dòng)傳感器是一個(gè)位移傳感器。然而由于其輸出的電信號(hào)是由電磁感應(yīng)產(chǎn)生，根據(jù)電磁感應(yīng)電律，當(dāng)線圈在磁場(chǎng)中作相對(duì)運(yùn)動(dòng)時(shí)，所感生的電動(dòng)勢(shì)與線圈切割磁力線的速度成正比。因此就傳感器的輸出信號(hào)來(lái)說(shuō)，感應(yīng)電動(dòng)勢(shì)是同被測(cè)振動(dòng)速度成正比的，所以它實(shí)際上是一個(gè)速度傳感器。
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