當電(dian)機具(ju)有(you)直線(xian)換向(xiang)(xiang)條(tiao)件(jian)時(shi),其全(quan)部換向(xiang)(xiang)能量從(cong)一(yi)(yi)個(ge)元(yuan)件(jian)傳遞給另一(yi)(yi)個(ge)元(yuan)件(jian),電(dian)刷下不發(fa)生能量的擴(kuo)散(san)(san).當電(dian)機不滿足直線(xian)換向(xiang)(xiang)條(tiao)件(jian)時(shi),有(you)一(yi)(yi)部分(fen)換向(xiang)(xiang)功(gong)率變為電(dian)機的外力矩和電(dian)刷的接觸損耗, 而電(dian)刷下的損耗將以(yi)火花的形式發(fa)散(san)(san).過去,直流電(dian)機設計(ji)(ji)是以(yi)電(dian)抗電(dian)勢 e:作為換向(xiang)(xiang)的評定標準,因為它包括了電(dian)機轉速,線(xian) 負載,磁導(dao)率等有(you)關電(dian)磁及結構參數(shu).由于其推導(dao)及計(ji)(ji)算中的問題,本身有(you)一(yi)(yi)定近(jin)似(si)性(xing),故雖(sui)可解決一(yi)(yi)部分(fen)問題,但存在某些不足。
如,現有電(dian)(dian)(dian)(dian)(dian)機(ji)中,有些電(dian)(dian)(dian)(dian)(dian)機(ji)電(dian)(dian)(dian)(dian)(dian)抗(kang)電(dian)(dian)(dian)(dian)(dian)勢雖大,但換(huan)向(xiang)卻(que)滿意,反之(zhi),雖其電(dian)(dian)(dian)(dian)(dian)抗(kang)電(dian)(dian)(dian)(dian)(dian)勢在限 定范圍內,但換(huan)向(xiang)性(xing)能(neng)(neng)(neng)可能(neng)(neng)(neng)相當惡劣.現代直流牽引電(dian)(dian)(dian)(dian)(dian)動機(ji)已開始采用(yong)"換(huan)向(xiang)強(qiang)度準則"來(lai)評價電(dian)(dian)(dian)(dian)(dian)機(ji)的換(huan)向(xiang)性(xing)能(neng)(neng)(neng).它是(shi)以(yi)換(huan)向(xiang)能(neng)(neng)(neng)量(liang)(liang)(liang)理(li)論為基礎的.換(huan)向(xiang)能(neng)(neng)(neng)量(liang)(liang)(liang)理(li)論認為.在換(huan)向(xiang)過程(cheng)中,換(huan)向(xiang)元(yuan)(yuan)件(jian)(jian)(jian)中儲存的 電(dian)(dian)(dian)(dian)(dian)磁能(neng)(neng)(neng)量(liang)(liang)(liang)由一個(ge)元(yuan)(yuan)件(jian)(jian)(jian)向(xiang)另一個(ge)元(yuan)(yuan)件(jian)(jian)(jian)傳遞,當實(shi)槽(cao)內較后(hou)一個(ge)元(yuan)(yuan)件(jian)(jian)(jian)換(huan)向(xiang)時(shi),除(chu) 了該元(yuan)(yuan)件(jian)(jian)(jian)本(ben)身的電(dian)(dian)(dian)(dian)(dian)磁能(neng)(neng)(neng)量(liang)(liang)(liang)外,還有實(shi)槽(cao)內其它元(yuan)(yuan)件(jian)(jian)(jian)換(huan)向(xiang)時(shi),傳遞來(lai)的電(dian)(dian)(dian)(dian)(dian)磁能(neng)(neng)(neng)量(liang)(liang)(liang).因此,集中于較后(hou)元(yuan)(yuan)件(jian)(jian)(jian)的電(dian)(dian)(dian)(dian)(dian) 磁能(neng)(neng)(neng)壇(tan)在電(dian)(dian)(dian)(dian)(dian)刷下擴散電(dian)(dian)(dian)(dian)(dian)機(ji),電(dian)(dian)(dian)(dian)(dian)機(ji)如何啟動較終將以(yi)火花的形式釋放出來(lai)。
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