Product classification
發電機電刷又叫炭刷。
1、電(dian)刷的(de)構(gou)造,發電(dian)機常見的(de)電(dian)刷有(you)是天然石墨電(dian)刷和電(dian)化石墨電(dian)刷二(er)種。
(1)是(shi)天然(ran)石(shi)墨電刷(shua),是(shi)天然(ran)石(shi)墨電刷(shua)是(shi)以(yi)是(shi)天然(ran)石(shi)墨粉作(zuo)基料(liao),輔(fu)以(yi)樹脂、煤焦油(或瀝青),經混(hun)和、壓制、凝固、生(sheng)產加工(gong)而(er)成。因為原料(liao)的配比不同(tong),生(sheng)產制造出(chu)的“電刷”電阻系數也會不同。因(yin)而,電刷的應用也就會有相應型號限定。
(2)電(dian)(dian)化(hua)(hua)(hua)石(shi)(shi)墨(mo)電(dian)(dian)刷,電(dian)(dian)化(hua)(hua)(hua)石(shi)(shi)墨(mo)電(dian)(dian)刷又分成普通電(dian)(dian)化(hua)(hua)(hua)石(shi)(shi)墨(mo)電(dian)(dian)刷和金屬石(shi)(shi)墨(mo)電(dian)(dian)刷二(er)種。普通電(dian)(dian)化(hua)(hua)(hua)石(shi)(shi)墨(mo)電(dian)(dian)刷關鍵選用焦炭、木炭、石(shi)(shi)墨(mo)粉、輔以煤焦油(或瀝青(qing))混和并壓制成毛坯,再(zai)經電(dian)(dian)化(hua)(hua)(hua)而成。電(dian)(dian)化(hua)(hua)(hua)需經2次焙燒處理,初步是1300℃的焙燒,使其成形,再經(jing)2500℃以上的焙(bei)燒,使其配料(liao)中的無(wu)形碳轉換為人造(zao)石墨。
金屬(shu)石(shi)墨(mo)電刷是以(yi)銅、銀,錫、鉛等金屬(shu)粉(fen)末和石(shi)墨(mo)粉(fen)為原(yuan)料,經研磨、混和、壓(ya)制(zhi)、凝固(gu)(或焙燒)、生產(chan)加工而成。
2、電(dian)(dian)刷(shua)(shua)的作(zuo)用(yong),電(dian)(dian)刷(shua)(shua)在(zai)發電(dian)(dian)機中(zhong)的關鍵(jian)作(zuo)用(yong)以下。
(1)輸入電流,將(jiang)外部電流(勵磁電流)利(li)用電刷加到轉動(dong)的轉子(zi)上(shang)。
(2)輸出(chu)電流,將大(da)軸上的靜電荷經電刷引入大(da)地。
(3)換向作用(yong),在整流(liu)電(dian)機(ji)中(zhong),利用(yong)電(dian)刷來改變電(dian)流(liu)方向。