2.工作原理
電流通過電線時,將會以電線為中心而產(chǎn)生同心圓形狀的磁場。此時,如果將電線彎成如圖中的“彈簧形”,電感器內(nèi)部的磁通量將指向同一方向,從而增強。通過調(diào)整圈數(shù),可以產(chǎn)生與圈數(shù)成正比的磁場。這就是電感器的原理。
電流通過電感器會產(chǎn)生磁場,相反,磁場變化則會產(chǎn)生電流。
(電磁感應定律)
E = L ?(d i/d t)
L: 電感器的自感
E: 反電動勢

電感器的原理
電感器中產(chǎn)生的反電動勢E,與單位時間的電流變化率(di/dt)成正比,因此在一定電流持續(xù)沿同一方向流動的直流電通過時不會發(fā)生。也就是說,電感器對于直流電流沒有任何作用,只對交流電起到阻礙電流的作用。利用電感器的這一性質(zhì),在交流電路中可以用作電阻(阻抗)。電感器具備的阻抗Z(單位Ω)為:
Z=ωL=2πfL
f為交流頻率、L為電感器的自感。
3.符號與單位
(1)電感符號:L
(2)電感單位:亨 (H)、毫亨(mH)、微亨 (uH),1H=103mH=106uH。
(3)電感量的標稱:直標式、色環(huán)標式、無標式
(4)電感方向性:無方向
(5)檢查電感好壞方法:用電感測量儀測量其電感量;用萬用表測量其通斷,理想的電感電阻很小,近乎為零。

電感器的圖形符號
4.主要技術參數(shù)
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歐戟進口BINKS密封備件250625
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| C2401-5 | ||
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| LTN | S168-20/08-G09 | |
| Duplomatic | 12VDC c22s3-d12k1/11 | |
| Rexroth | R162229320 | |
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