熔斷器（fuse）是指當電流超過規定值時，以本身產生的熱量使熔體熔斷，斷開電路的一種電器。熔斷器是根據電流超過規定值一段時間后，以其自身產生的熱量使熔體熔化，從而使電路斷開；運用這種原理制成的一種電流保護器。熔斷器廣泛應用于高低壓配電系統和控制系統以及用電設備中，作為短路和過電流的保護器，是應用最普遍的保護器件之一。
利(li)用(yong)(yong)金(jin)(jin)屬導體(ti)(ti)(ti)(ti)作(zuo)(zuo)為熔(rong)(rong)(rong)(rong)(rong)(rong)(rong)體(ti)(ti)(ti)(ti)串聯于(yu)電路中(zhong)，當過載或(huo)短(duan)路電流(liu)(liu)過熔(rong)(rong)(rong)(rong)(rong)(rong)(rong)體(ti)(ti)(ti)(ti)時，因(yin)其(qi)自身發熱(re)而熔(rong)(rong)(rong)(rong)(rong)(rong)(rong)斷(duan)(duan)(duan)(duan)(duan)(duan)(duan)，從而分斷(duan)(duan)(duan)(duan)(duan)(duan)(duan)電路的(de)(de)(de)(de)(de)一種電器(qi)(qi)。熔(rong)(rong)(rong)(rong)(rong)(rong)(rong)斷(duan)(duan)(duan)(duan)(duan)(duan)(duan)器(qi)(qi)結(jie)構簡單(dan)，使用(yong)(yong)方便，廣泛用(yong)(yong)于(yu)電力系統、各種電工設備(bei)和(he)家用(yong)(yong)電器(qi)(qi)中(zhong)作(zuo)(zuo)為保(bao)護(hu)(hu)器(qi)(qi)件。熔(rong)(rong)(rong)(rong)(rong)(rong)(rong)斷(duan)(duan)(duan)(duan)(duan)(duan)(duan)器(qi)(qi)主要(yao)由(you)熔(rong)(rong)(rong)(rong)(rong)(rong)(rong)體(ti)(ti)(ti)(ti)、外殼和(he)支座3部(bu)分組(zu)成(cheng)(cheng)(cheng)，其(qi)中(zhong)熔(rong)(rong)(rong)(rong)(rong)(rong)(rong)體(ti)(ti)(ti)(ti)是控制熔(rong)(rong)(rong)(rong)(rong)(rong)(rong)斷(duan)(duan)(duan)(duan)(duan)(duan)(duan)特(te)性(xing)(xing)的(de)(de)(de)(de)(de)關鍵元件。熔(rong)(rong)(rong)(rong)(rong)(rong)(rong)體(ti)(ti)(ti)(ti)的(de)(de)(de)(de)(de)材(cai)料(liao)、尺(chi)寸和(he)形(xing)狀(zhuang)決定了熔(rong)(rong)(rong)(rong)(rong)(rong)(rong)斷(duan)(duan)(duan)(duan)(duan)(duan)(duan)特(te)性(xing)(xing)。熔(rong)(rong)(rong)(rong)(rong)(rong)(rong)體(ti)(ti)(ti)(ti)材(cai)料(liao)分為低熔(rong)(rong)(rong)(rong)(rong)(rong)(rong)點(dian)(dian)和(he)高熔(rong)(rong)(rong)(rong)(rong)(rong)(rong)點(dian)(dian)兩類。低熔(rong)(rong)(rong)(rong)(rong)(rong)(rong)點(dian)(dian)材(cai)料(liao)如鉛和(he)鉛合(he)(he)金(jin)(jin)，其(qi)熔(rong)(rong)(rong)(rong)(rong)(rong)(rong)點(dian)(dian)低容易熔(rong)(rong)(rong)(rong)(rong)(rong)(rong)斷(duan)(duan)(duan)(duan)(duan)(duan)(duan)，由(you)于(yu)其(qi)電阻率較(jiao)大，故制成(cheng)(cheng)(cheng)熔(rong)(rong)(rong)(rong)(rong)(rong)(rong)體(ti)(ti)(ti)(ti)的(de)(de)(de)(de)(de)截(jie)面尺(chi)寸較(jiao)大，熔(rong)(rong)(rong)(rong)(rong)(rong)(rong)斷(duan)(duan)(duan)(duan)(duan)(duan)(duan)時產生的(de)(de)(de)(de)(de)金(jin)(jin)屬蒸氣較(jiao)多，只適(shi)用(yong)(yong)于(yu)低分斷(duan)(duan)(duan)(duan)(duan)(duan)(duan)能力的(de)(de)(de)(de)(de)熔(rong)(rong)(rong)(rong)(rong)(rong)(rong)斷(duan)(duan)(duan)(duan)(duan)(duan)(duan)器(qi)(qi)。高熔(rong)(rong)(rong)(rong)(rong)(rong)(rong)點(dian)(dian)材(cai)料(liao)如銅(tong)、銀，其(qi)熔(rong)(rong)(rong)(rong)(rong)(rong)(rong)點(dian)(dian)高，不(bu)容易熔(rong)(rong)(rong)(rong)(rong)(rong)(rong)斷(duan)(duan)(duan)(duan)(duan)(duan)(duan)，但由(you)于(yu)其(qi)電阻率較(jiao)低，可(ke)制成(cheng)(cheng)(cheng)比低熔(rong)(rong)(rong)(rong)(rong)(rong)(rong)點(dian)(dian)熔(rong)(rong)(rong)(rong)(rong)(rong)(rong)體(ti)(ti)(ti)(ti)較(jiao)小的(de)(de)(de)(de)(de)截(jie)面尺(chi)寸，熔(rong)(rong)(rong)(rong)(rong)(rong)(rong)斷(duan)(duan)(duan)(duan)(duan)(duan)(duan)時產生的(de)(de)(de)(de)(de)金(jin)(jin)屬蒸氣少，適(shi)用(yong)(yong)于(yu)高分斷(duan)(duan)(duan)(duan)(duan)(duan)(duan)能力的(de)(de)(de)(de)(de)熔(rong)(rong)(rong)(rong)(rong)(rong)(rong)斷(duan)(duan)(duan)(duan)(duan)(duan)(duan)器(qi)(qi)。熔(rong)(rong)(rong)(rong)(rong)(rong)(rong)體(ti)(ti)(ti)(ti)的(de)(de)(de)(de)(de)形(xing)狀(zhuang)分為絲狀(zhuang)和(he)帶狀(zhuang)兩種。改(gai)變(bian)變(bian)截(jie)面的(de)(de)(de)(de)(de)形(xing)狀(zhuang)可(ke)顯著改(gai)變(bian)熔(rong)(rong)(rong)(rong)(rong)(rong)(rong)斷(duan)(duan)(duan)(duan)(duan)(duan)(duan)器(qi)(qi)的(de)(de)(de)(de)(de)熔(rong)(rong)(rong)(rong)(rong)(rong)(rong)斷(duan)(duan)(duan)(duan)(duan)(duan)(duan)特(te)性(xing)(xing)。熔(rong)(rong)(rong)(rong)(rong)(rong)(rong)斷(duan)(duan)(duan)(duan)(duan)(duan)(duan)器(qi)(qi)有各種不(bu)同的(de)(de)(de)(de)(de)熔(rong)(rong)(rong)(rong)(rong)(rong)(rong)斷(duan)(duan)(duan)(duan)(duan)(duan)(duan)特(te)性(xing)(xing)曲線(xian)，可(ke)以(yi)適(shi)用(yong)(yong)于(yu)不(bu)同類型保(bao)護(hu)(hu)對象的(de)(de)(de)(de)(de)需要(yao)。熔(rong)(rong)(rong)(rong)(rong)(rong)(rong)斷(duan)(duan)(duan)(duan)(duan)(duan)(duan)器(qi)(qi)的(de)(de)(de)(de)(de)選(xuan)擇主要(yao)依據負載的(de)(de)(de)(de)(de)保(bao)護(hu)(hu)特(te)性(xing)(xing)和(he)短(duan)路電流(liu)(liu)的(de)(de)(de)(de)(de)大小選(xuan)擇熔(rong)(rong)(rong)(rong)(rong)(rong)(rong)斷(duan)(duan)(duan)(duan)(duan)(duan)(duan)器(qi)(qi)的(de)(de)(de)(de)(de)類型。對于(yu)容量小的(de)(de)(de)(de)(de)電動機(ji)和(he)照(zhao)明(ming)(ming)支線(xian)，常(chang)采用(yong)(yong)熔(rong)(rong)(rong)(rong)(rong)(rong)(rong)斷(duan)(duan)(duan)(duan)(duan)(duan)(duan)器(qi)(qi)作(zuo)(zuo)為過載及短(duan)路保(bao)護(hu)(hu)，因(yin)而希望熔(rong)(rong)(rong)(rong)(rong)(rong)(rong)體(ti)(ti)(ti)(ti)的(de)(de)(de)(de)(de)熔(rong)(rong)(rong)(rong)(rong)(rong)(rong)化系數適(shi)當小些。通常(chang)選(xuan)用(yong)(yong)鉛錫(xi)合(he)(he)金(jin)(jin)熔(rong)(rong)(rong)(rong)(rong)(rong)(rong)體(ti)(ti)(ti)(ti)的(de)(de)(de)(de)(de)RQA系列熔(rong)(rong)(rong)(rong)(rong)(rong)(rong)斷(duan)(duan)(duan)(duan)(duan)(duan)(duan)器(qi)(qi)。對于(yu)較(jiao)大容量的(de)(de)(de)(de)(de)電動機(ji)和(he)照(zhao)明(ming)(ming)干(gan)線(xian)，則應著重考慮(lv)短(duan)路保(bao)護(hu)(hu)和(he)分斷(duan)(duan)(duan)(duan)(duan)(duan)(duan)能力。通常(chang)選(xuan)用(yong)(yong)具有較(jiao)高分斷(duan)(duan)(duan)(duan)(duan)(duan)(duan)能力的(de)(de)(de)(de)(de)RM10和(he)RL1系列的(de)(de)(de)(de)(de)熔(rong)(rong)(rong)(rong)(rong)(rong)(rong)斷(duan)(duan)(duan)(duan)(duan)(duan)(duan)器(qi)(qi)；當短(duan)路電流(liu)(liu)很大時，宜(yi)采用(yong)(yong)具有限(xian)流(liu)(liu)作(zuo)(zuo)用(yong)(yong)的(de)(de)(de)(de)(de)RT0和(he)RTl2系列的(de)(de)(de)(de)(de)熔(rong)(rong)(rong)(rong)(rong)(rong)(rong)斷(duan)(duan)(duan)(duan)(duan)(duan)(duan)器(qi)(qi)

編碼器（encoder）是將信號（如比特流）或數據進行編制、轉換為可用以通訊、傳輸和存儲的信號形式的設備。編碼器把角位移或直線位移轉換成電信號，前者稱為碼盤，后者稱為碼尺。按照讀出方式編碼器可以分為接觸式和非接觸式兩種；
由一個中心有軸的光電碼盤，其上有環形通、暗的刻線，有光電發射和接收器件讀取，獲得四組正弦波信號組合成A、B、C、D,每個正弦波相差90度相位差（相對于一個周波為360度），將C、D信號反向，疊加在A、B兩相上，可增強穩定信號；另每轉輸出一個Z相脈沖以代表零位參考位。
由于A、B兩相相差90度，可通過比較A相在前還是B相在前，以判別編碼器的正轉與反轉，通過零位脈沖，可獲得編碼器的零位參考位。編碼器碼盤的材料有玻璃、金屬、塑料，玻璃碼盤是在玻璃上沉積很薄的刻線，其熱穩定性好，精度高，金屬碼盤直接以通和不通刻線，不易碎，但由于金屬有一定的厚度，精度就有限制，其熱穩定性就要比玻璃的差一個數量級，塑料碼盤是經濟型的，其成本低，但精度、熱穩定性、壽命均要差一些。
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