框架式沈陽電磁鐵又稱箱(xiang)式電(dian)(dian)(dian)(dian)磁(ci)(ci)鐵(tie)(tie)，因(yin)為(wei)它(ta)(ta)的(de)形狀是方形的(de)。這(zhe)種框架電(dian)(dian)(dian)(dian)磁(ci)(ci)鐵(tie)(tie)是一(yi)種產生電(dian)(dian)(dian)(dian)磁(ci)(ci)的(de)設備。當變壓器(qi)(qi)鐵(tie)(tie)心在(zai)外旋轉(zhuan)，其輸(shu)出功(gong)率與導電(dian)(dian)(dian)(dian)繞(rao)組電(dian)(dian)(dian)(dian)阻(zu)一(yi)致時，帶電(dian)(dian)(dian)(dian)流(liu)的(de)線(xian)圈具有(you)與磁(ci)(ci)鐵(tie)(tie)相同的(de)磁(ci)(ci)性。我們(men)通常(chang)把它(ta)(ta)做(zuo)成條狀或蹄狀，使它(ta)(ta)的(de)變壓器(qi)(qi)鐵(tie)(tie)心更容(rong)易磁(ci)(ci)化。另外，為(wei)了(le)使電(dian)(dian)(dian)(dian)磁(ci)(ci)鐵(tie)(tie)立即斷電(dian)(dian)(dian)(dian)消(xiao)磁(ci)(ci)，我們(men)經常(chang)采用(yong)快速消(xiao)磁(ci)(ci)的(de)軟鐵(tie)(tie)或硅鋼(gang)材料制作。這(zhe)種電(dian)(dian)(dian)(dian)磁(ci)(ci)鐵(tie)(tie)插上電(dian)(dian)(dian)(dian)源就(jiu)會有(you)磁(ci)(ci)性。當電(dian)(dian)(dian)(dian)源關閉時，磁(ci)(ci)場將消(xiao)失(shi)。方形電(dian)(dian)(dian)(dian)磁(ci)(ci)鐵(tie)(tie)在(zai)我們(men)的(de)日常(chang)生活中(zhong)有(you)很多用(yong)途，因(yin)為(wei)它(ta)(ta)的(de)產生也使發電(dian)(dian)(dian)(dian)機組的(de)輸(shu)出功(gong)率有(you)了(le)很大(da)的(de)提高。

電磁鐵交流原理

我們先來看看電(dian)磁(ci)鐵(tie)(tie)的(de)組(zu)(zu)成原理(li)：電(dian)磁(ci)鐵(tie)(tie)主要由(you)線圈、鐵(tie)(tie)芯和電(dian)樞(shu)組(zu)(zu)成。鐵(tie)(tie)芯和電(dian)樞(shu)一般(ban)由(you)軟(ruan)磁(ci)材料制成。一般(ban)分為直流(liu)電(dian)磁(ci)鐵(tie)(tie)和通(tong)信電(dian)磁(ci)鐵(tie)(tie)。通(tong)信電(dian)磁(ci)鐵(tie)(tie)的(de)原理(li)是什(shen)么(me)？

通訊電(dian)(dian)磁鐵(tie)線(xian)圈插入時，鐵(tie)芯(xin)和(he)電(dian)(dian)樞被磁化，變成兩個極性相反(fan)的磁鐵(tie)。當吸(xi)附力(li)(li)(li)(li)超過(guo)張力(li)(li)(li)(li)彈簧(huang)的反(fan)作用力(li)(li)(li)(li)時，電(dian)(dian)樞轉向點(dian)向鐵(tie)心方向移動。當線(xian)圈中(zhong)的電(dian)(dian)流低于一(yi)定值(zhi)或電(dian)(dian)源中(zhong)斷時，電(dian)(dian)磁吸(xi)收力(li)(li)(li)(li)低于張力(li)(li)(li)(li)彈簧(huang)的反(fan)作用力(li)(li)(li)(li)，電(dian)(dian)樞在反(fan)作用力(li)(li)(li)(li)的作用下會回到(dao)原來的釋(shi)放方向。

值得注意的(de)(de)是(shi)，通(tong)信電(dian)磁(ci)(ci)鐵(tie)(tie)的(de)(de)電(dian)磁(ci)(ci)吸(xi)收力(li)是(shi)由磁(ci)(ci)選機的(de)(de)磁(ci)(ci)場(chang)和磁(ci)(ci)選機的(de)(de)磁(ci)(ci)場(chang)組成的(de)(de)兩(liang)個交變(bian)電(dian)場(chang)的(de)(de)磁(ci)(ci)場(chang)力(li)加上(shang)直(zhi)(zhi)流凈重作用的(de)(de)，更(geng)容易釋(shi)放，所以輸出(chu)功率低(di)，變(bian)壓器鐵(tie)(tie)心體積大，線圈能耗高(gao)；功率因數低(di)，線圈電(dian)流大，發熱嚴重，不(bu)僅浪費了(le)電(dian)能，而且造成線圈老(lao)化破壞過早(zao)。很(hen)糟糕。因此，大多數時候我們會選擇直(zhi)(zhi)流電(dian)而不(bu)是(shi)通(tong)訊(xun)電(dian)磁(ci)(ci)鐵(tie)(tie)。