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電感器的的作用用??/h3>
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<span>文章出處??a href=""><a >深圳市晨飛電子有限公??/a></a></span><span>網(wǎng)責(zé)任編輯：<a >NSW</a></span><span>作者：<a >NSW</a></span><span>人氣??span
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<p> 電路中的任何電流，會(huì)產(chǎn)生磁場(chǎng)，磁場(chǎng)的磁通量又作用于電路上。依據(jù)楞次定律，此磁通會(huì)借由感應(yīng)出的電壓而傾向于抵抗電流的改變。磁通改變量對(duì)電流改變量的比值稱為自感，自感通常也就直接稱作是這個(gè)電路的<strong>電感</strong>。具有電感性的裝置稱為電感器，電感器通常是一線圈，可以聚集磁??</p>
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1、電感器的作用主要是通直流，阻交流，在電路中主要起到濾波、振蕩、延遲、陷波等作用。電感線圈對(duì)交流電流有阻礙作用，阻礙作用的大小稱感抗XL，單位是歐姆。它與電感量L和交流電頻率f的關(guān)系為XL=2πfL，電感器主要可分為高頻阻流線圈及低頻阻流線圈。調(diào)諧與選頻作用：電感線圈與電容器并聯(lián)可組成LC調(diào)諧電路。即電路的固有振蕩頻率f0與非交流信號(hào)的頻率f相等，則回路的感抗與容抗也相等，于是電磁能量就在電感、電容來回振蕩，這LC回路的諧振現(xiàn)象。諧振時(shí)電路的感抗與容抗等值又反向，回路總電流的感抗最小，電流量最大，LC諧振電路具有選擇頻率的作用，能將某一頻率f的交流信號(hào)選擇出來??/p>
<p> 2??strong>電感</strong>器還有篩選信號(hào)、過濾噪聲、穩(wěn)定電流及抑制電磁波干擾等作用。在電子設(shè)備中，經(jīng)?？吹接械拇怒h(huán)，這種磁環(huán)與連接電纜構(gòu)成一個(gè)電感器，它是電子電路中常用的抗干擾元件，高頻噪聲有很好的屏蔽作用，故被稱為吸收磁環(huán)，通常使用鐵氧體材料制成，又稱鐵氧體磁環(huán)。磁環(huán)在不同的頻率下有不同的阻抗特牲。在低頻時(shí)阻抗很小，當(dāng)信號(hào)頻率升高后磁環(huán)的阻抗急劇變大.</p>
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