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一、工作原理

當在(zai)通電(dian)(dian)(dian)(dian)(dian)(dian)(dian)螺(luo)線(xian)(xian)(xian)管內(nei)部插入(ru)鐵(tie)(tie)(tie)(tie)芯(xin)(xin)后(hou)，鐵(tie)(tie)(tie)(tie)芯(xin)(xin)被通電(dian)(dian)(dian)(dian)(dian)(dian)(dian)螺(luo)線(xian)(xian)(xian)管的(de)磁(ci)(ci)(ci)(ci)(ci)場(chang)(chang)磁(ci)(ci)(ci)(ci)(ci)化(hua)(hua)。磁(ci)(ci)(ci)(ci)(ci)化(hua)(hua)后(hou)的(de)鐵(tie)(tie)(tie)(tie)芯(xin)(xin)也變成了一(yi)(yi)個(ge)磁(ci)(ci)(ci)(ci)(ci)體，這(zhe)(zhe)樣(yang)由于(yu)兩(liang)個(ge)磁(ci)(ci)(ci)(ci)(ci)場(chang)(chang)互(hu)相(xiang)疊加，從而(er)(er)使(shi)螺(luo)線(xian)(xian)(xian)管的(de)磁(ci)(ci)(ci)(ci)(ci)性(xing)(xing)(xing)大(da)(da)大(da)(da)增強。為了使(shi)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)磁(ci)(ci)(ci)(ci)(ci)鐵(tie)(tie)(tie)(tie)的(de)磁(ci)(ci)(ci)(ci)(ci)性(xing)(xing)(xing)更強，通常將(jiang)鐵(tie)(tie)(tie)(tie)芯(xin)(xin)制(zhi)成蹄形。但要注意蹄形鐵(tie)(tie)(tie)(tie)芯(xin)(xin)上線(xian)(xian)(xian)圈的(de)繞(rao)向(xiang)相(xiang)反(fan)，一(yi)(yi)邊(bian)(bian)順時(shi)針，另一(yi)(yi)邊(bian)(bian)必須逆時(shi)針。如(ru)果繞(rao)向(xiang)相(xiang)同(tong)，兩(liang)線(xian)(xian)(xian)圈對鐵(tie)(tie)(tie)(tie)芯(xin)(xin)的(de)磁(ci)(ci)(ci)(ci)(ci)化(hua)(hua)作用(yong)(yong)將(jiang)相(xiang)互(hu)抵消，使(shi)鐵(tie)(tie)(tie)(tie)芯(xin)(xin)不(bu)顯磁(ci)(ci)(ci)(ci)(ci)性(xing)(xing)(xing)。另外，電(dian)(dian)(dian)(dian)(dian)(dian)(dian)磁(ci)(ci)(ci)(ci)(ci)鐵(tie)(tie)(tie)(tie)的(de)鐵(tie)(tie)(tie)(tie)芯(xin)(xin)用(yong)(yong)軟鐵(tie)(tie)(tie)(tie)制(zhi)做(zuo)，而(er)(er)不(bu)能(neng)用(yong)(yong)鋼制(zhi)做(zuo)。否則鋼一(yi)(yi)旦被磁(ci)(ci)(ci)(ci)(ci)化(hua)(hua)后(hou)，將(jiang)長(chang)期保持磁(ci)(ci)(ci)(ci)(ci)性(xing)(xing)(xing)而(er)(er)不(bu)能(neng)退(tui)磁(ci)(ci)(ci)(ci)(ci)，則其磁(ci)(ci)(ci)(ci)(ci)性(xing)(xing)(xing)的(de)強弱就不(bu)能(neng)用(yong)(yong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)的(de)大(da)(da)小來(lai)控制(zhi)，而(er)(er)失去電(dian)(dian)(dian)(dian)(dian)(dian)(dian)磁(ci)(ci)(ci)(ci)(ci)鐵(tie)(tie)(tie)(tie)應(ying)有(you)的(de)優(you)點。電(dian)(dian)(dian)(dian)(dian)(dian)(dian)磁(ci)(ci)(ci)(ci)(ci)鐵(tie)(tie)(tie)(tie)是可(ke)以(yi)通電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)來(lai)產(chan)生(sheng)(sheng)磁(ci)(ci)(ci)(ci)(ci)力的(de)器(qi)件，屬非永(yong)久(jiu)磁(ci)(ci)(ci)(ci)(ci)鐵(tie)(tie)(tie)(tie)，可(ke)以(yi)很容(rong)易地將(jiang)其磁(ci)(ci)(ci)(ci)(ci)性(xing)(xing)(xing)啟動或是消除。例如(ru)：大(da)(da)型起(qi)重機利用(yong)(yong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)磁(ci)(ci)(ci)(ci)(ci)鐵(tie)(tie)(tie)(tie)將(jiang)廢棄(qi)車輛抬起(qi)。當電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)通過(guo)導線(xian)(xian)(xian)時(shi)，會在(zai)導線(xian)(xian)(xian)的(de)周圍產(chan)生(sheng)(sheng)磁(ci)(ci)(ci)(ci)(ci)場(chang)(chang)。應(ying)用(yong)(yong)這(zhe)(zhe)性(xing)(xing)(xing)質(zhi)，將(jiang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)通過(guo)螺(luo)線(xian)(xian)(xian)管時(shi)，則會在(zai)螺(luo)線(xian)(xian)(xian)管之內(nei)制(zhi)成均勻磁(ci)(ci)(ci)(ci)(ci)場(chang)(chang)。假設在(zai)螺(luo)線(xian)(xian)(xian)管的(de)中心置(zhi)入(ru)鐵(tie)(tie)(tie)(tie)磁(ci)(ci)(ci)(ci)(ci)性(xing)(xing)(xing)物質(zhi)，則此鐵(tie)(tie)(tie)(tie)磁(ci)(ci)(ci)(ci)(ci)性(xing)(xing)(xing)物質(zhi)會被磁(ci)(ci)(ci)(ci)(ci)化(hua)(hua)，而(er)(er)且會大(da)(da)大(da)(da)增強磁(ci)(ci)(ci)(ci)(ci)場(chang)(chang)。一(yi)(yi)般(ban)而(er)(er)言，電(dian)(dian)(dian)(dian)(dian)(dian)(dian)磁(ci)(ci)(ci)(ci)(ci)鐵(tie)(tie)(tie)(tie)所(suo)(suo)產(chan)生(sheng)(sheng)的(de)磁(ci)(ci)(ci)(ci)(ci)場(chang)(chang)與電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)大(da)(da)小、線(xian)(xian)(xian)圈圈數及中心的(de)鐵(tie)(tie)(tie)(tie)磁(ci)(ci)(ci)(ci)(ci)體有(you)關。在(zai)設計電(dian)(dian)(dian)(dian)(dian)(dian)(dian)磁(ci)(ci)(ci)(ci)(ci)鐵(tie)(tie)(tie)(tie)時(shi)，會注重線(xian)(xian)(xian)圈的(de)分布和鐵(tie)(tie)(tie)(tie)磁(ci)(ci)(ci)(ci)(ci)體的(de)選擇，并利用(yong)(yong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)大(da)(da)小來(lai)控制(zhi)磁(ci)(ci)(ci)(ci)(ci)場(chang)(chang)。由于(yu)線(xian)(xian)(xian)圈的(de)材料具有(you)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻，這(zhe)(zhe)限制(zhi)了電(dian)(dian)(dian)(dian)(dian)(dian)(dian)磁(ci)(ci)(ci)(ci)(ci)鐵(tie)(tie)(tie)(tie)所(suo)(suo)能(neng)產(chan)生(sheng)(sheng)的(de)磁(ci)(ci)(ci)(ci)(ci)場(chang)(chang)大(da)(da)小，但隨著超導體的(de)發(fa)現與應(ying)用(yong)(yong)，將(jiang)有(you)機會超越(yue)現有(you)的(de)限制(zhi)。

二、主要特點　　

1、采用全密封結構，防(fang)潮性能好。

2、經計算機(ji)優化設(she)計，結構合(he)理、自(zi)重輕(qing)、吸力大、能耗低。

3、勵磁線圈(quan)經特(te)別工藝處理(li)，提高了線圈(quan)的電(dian)器和(he)機(ji)械性能(neng)，絕緣資料熱等級到達(da)C級，運用壽命長。

4、普(pu)通(tong)型電磁(ci)鐵的(de)額定通(tong)電持續率由曩昔的(de)50%提高到60%，提高了電磁(ci)鐵的(de)運用功(gong)率。

5、超高溫型電磁鐵采用獨特隔(ge)熱方式，其間被吸物溫度有(you)曩昔的600℃提高700℃，擴大了(le)電磁鐵的適用范圍。

6、裝置、運(yun)轉(zhuan)、保護(hu)簡潔(jie)。

三、應用領域　

門(men)(men)禁：為什么門(men)(men)禁可以在沒(mei)刷卡(ka)時把(ba)門(men)(men)牢(lao)牢(lao)的(de)(de)“抓(zhua)住”？原(yuan)來單元門(men)(men)是由鋼材料(liao)做成的(de)(de)，那(nei)個金(jin)(jin)屬(shu)(shu)體(ti)(ti)在通電時可以產生(sheng)強(qiang)大(da)的(de)(de)磁場，產生(sheng)的(de)(de)磁力能把(ba)門(men)(men)牢(lao)牢(lao)的(de)(de)吸住，而刷卡(ka)的(de)(de)瞬間，切斷(duan)電流，金(jin)(jin)屬(shu)(shu)體(ti)(ti)失去磁性，我們就可以打開門(men)(men)了(le)。那(nei)個金(jin)(jin)屬(shu)(shu)體(ti)(ti)其實是一塊電磁鐵(tie)。

電(dian)(dian)磁(ci)起重機(ji)：最直接的(de)應用(yong)之一是電(dian)(dian)磁(ci)起重機(ji)。電(dian)(dian)磁(ci)鐵(tie)安(an)裝在(zai)吊(diao)車上，通電(dian)(dian)后吸起大量鋼鐵(tie)，移動(dong)到另一個位(wei)置后切斷電(dian)(dian)流，鋼鐵(tie)被放下，免(mian)去了(le)打捆的(de)麻煩。大型電(dian)(dian)磁(ci)起重機(ji)一次可以吊(diao)起幾噸(dun)鋼材。

在電(dian)動機、發電(dian)機、電(dian)鈴和電(dian)磁繼電(dian)器(qi)里也(ye)(ye)用到電(dian)磁鐵。全自動洗衣機的進水、排水閥門(men)，衛生間里感應式沖(chong)水器(qi)的閥門(men)，也(ye)(ye)都是由電(dian)磁鐵控制的。

電(dian)磁鐵的(de)另一個(ge)應用是產生強(qiang)磁場。現代技術(shu)中很多(duo)地方需要的(de)強(qiang)磁場都由電(dian)磁鐵提供(gong)，如大型電(dian)動機(ji)、發電(dian)機(ji)、磁療設備等。

（圖文來(lai)源(yuan)：網絡，版權歸原作(zuo)者所(suo)有，若有侵權請聯系刪除）

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