正反轉發電法
被試電(dian)機(ji)被該做他勵,用(yong)另一臺直流電(dian)機(ji)拖動(dong)旋轉。試驗中連結電(dian)機(ji)轉速穩(wen)固,勵磁電(dian)流穩(wen)固和負載穩(wen)固的(de)環境下,使(shi)(shi)其正反轉,在(zai)運行中調解電(dian)刷(shua)位置。使(shi)(shi)電(dian)機(ji)在(zai)兩個轉向時(shi),電(dian)樞的(de)電(dian)壓(ya)基原形等。此時(shi)電(dian)刷(shua)的(de)位置即為中性線。
1)空載特性(xing)實行
直(zhi)流(liu)(liu)電(dian)(dian)(dian)(dian)(dian)動(dong)機(ji)(ji)(ji)空(kong)(kong)載(zai)特性(xing)是指電(dian)(dian)(dian)(dian)(dian)動(dong)機(ji)(ji)(ji)空(kong)(kong)載(zai)時(shi)電(dian)(dian)(dian)(dian)(dian)樞電(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)對轉(zhuan)速的(de)干系(勵(li)磁(ci)(ci)電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)為額(e)定(ding)值(zhi))。空(kong)(kong)載(zai)試(shi)驗時(shi)應使電(dian)(dian)(dian)(dian)(dian)動(dong)機(ji)(ji)(ji)勵(li)磁(ci)(ci)回路施以(yi)額(e)定(ding)電(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)使勵(li)磁(ci)(ci)繞組到達額(e)定(ding)電(dian)(dian)(dian)(dian)(dian)流(liu)(liu),而給電(dian)(dian)(dian)(dian)(dian)樞電(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)為額(e)定(ding)值(zhi)時(shi)測(ce)取電(dian)(dian)(dian)(dian)(dian)動(dong)機(ji)(ji)(ji)的(de)轉(zhuan)速,而后連結電(dian)(dian)(dian)(dian)(dian)動(dong)機(ji)(ji)(ji)在(zai)額(e)定(ding)勵(li)磁(ci)(ci)電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)下變動(dong)電(dian)(dian)(dian)(dian)(dian)樞電(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)測(ce)取其(qi)相(xiang)應轉(zhuan)速,電(dian)(dian)(dian)(dian)(dian)樞電(dian)(dian)(dian)(dian)(dian)壓(ya)(ya),勵(li)磁(ci)(ci)電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)和電(dian)(dian)(dian)(dian)(dian)樞電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)。最高(gao)電(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)應過細不高(gao)出120%Uc。包管電(dian)(dian)(dian)(dian)(dian)動(dong)機(ji)(ji)(ji)轉(zhuan)速不高(gao)出120%ne。測(ce)定(ding)直(zhi)流(liu)(liu)電(dian)(dian)(dian)(dian)(dian)動(dong)機(ji)(ji)(ji)空(kong)(kong)載(zai)特性(xing)時(shi)應在(zai)其(qi)運(yun)轉(zhuan)肯定(ding)時(shi)間后再(zai)記錄儀表讀數,因為這時(shi)軸(zhou)(zhou)承和勵(li)磁(ci)(ci)繞組的(de)溫度才與事情(qing)昀雷劃一。 空(kong)(kong)載(zai)特性(xing)測(ce)定(ding)可根據測(ce)定(ding)的(de)轉(zhuan)速、電(dian)(dian)(dian)(dian)(dian)壓(ya)(ya)、電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)值(zhi)確定(ding)電(dian)(dian)(dian)(dian)(dian)動(dong)機(ji)(ji)(ji)的(de)空(kong)(kong)載(zai)斲喪。有利于鑒定(ding)電(dian)(dian)(dian)(dian)(dian)動(dong)機(ji)(ji)(ji)的(de)裝置、軸(zhou)(zhou)承事情(qing)是否良好及(ji)查(cha)抄(chao)其(qi)控制(zhi)性(xing)能。
2)直流電機的額定負載實行
直流(liu)電(dian)(dian)動機(ji)負載試驗(yan)的目的是校核(he)與查抄電(dian)(dian)動機(ji)在額定負載時(shi)的電(dian)(dian)樞電(dian)(dian)流(liu)、勵磁電(dian)(dian)流(liu)及轉速的數值(zhi),查抄電(dian)(dian)動機(ji)的換向環境(jing)、振動及運轉環境(jing)。
負(fu)載試驗時,力矩(ju)(ju)的數值可以直(zhi)接由(you)轉(zhuan)矩(ju)(ju)轉(zhuan)速測(ce)定(ding)儀測(ce)出或(huo)由(you)斲喪分析(xi)法確定(ding)出。議決試驗繪出其(qi)事(shi)(shi)情特性曲線,在測(ce)取(qu)事(shi)(shi)情特性曲線時可以空(kong)載或(huo)25%額定(ding)負(fu)載到125%過(guo)載范疇內恰當地量取(qu)數點,但肯定(ding)要取(qu)有額定(ding)事(shi)(shi)景況態(tai)的點。
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