SD-B3.031.030-04000
SD-B3.031.030-04000
AS-B237-001
電樞由原動(dòng)機(jī)驅(qū)動(dòng)在磁場中旋轉(zhuǎn),電樞線圈的兩根有效邊便切割磁力線,感應(yīng)出電動(dòng)勢(shì)。線圈隨電樞鐵心在轉(zhuǎn)動(dòng)時(shí),每一有效邊中的電動(dòng)勢(shì)是交變的,即在N極下是一個(gè)方向,當(dāng)它轉(zhuǎn)到S極下是另一個(gè)方向。但由于電刷A總是同與N極下的一邊相連的換向片接觸,而電刷B總是同與S極下的一邊相連的換向片接觸,因此在電刷上就出現(xiàn)一個(gè)極性不變的電動(dòng)勢(shì)或電壓。
換向片的作用就是將發(fā)電機(jī)電樞繞組內(nèi)的交變電動(dòng)勢(shì)轉(zhuǎn)換成電刷間極性不變的直流電動(dòng)勢(shì)。當(dāng)電刷間接上有負(fù)載時(shí),就在電路中產(chǎn)生一定方向的電流。其電動(dòng)勢(shì)的大小為:E=kEΦn方向與Ia相同。
Φ是一個(gè)磁極的磁通,單位是韋伯(Wb); n是電樞轉(zhuǎn)速,鐵芯的作用是傳遞變化磁場,(我國)主線圈在50HZ頻率下產(chǎn)生了變化的磁場。單位是轉(zhuǎn)每分(r/min);kE是與電動(dòng)機(jī)結(jié)構(gòu)有關(guān)的常數(shù);E的單位是伏特(V)。
載流導(dǎo)體在磁場中也受到一個(gè)電磁力,從而產(chǎn)生電磁轉(zhuǎn)距T,該電磁轉(zhuǎn)距是阻轉(zhuǎn)距。其大小為:T=KTΦIa
則原動(dòng)機(jī)的轉(zhuǎn)距T1與發(fā)電機(jī)的電磁轉(zhuǎn)距T及空載損耗轉(zhuǎn)距T0相平衡。即T1=T+ T0
音響器材功放中變壓器的應(yīng)用:大功率功放需要變壓器提供更多的功率輸出。
在電刷AB之間加上直流電壓U,電樞線圈中的電流流向?yàn)椋篘極下的有效邊中的電流總是一個(gè)方向,而S極下的有效邊中的電流總是另一個(gè)方向。這樣兩個(gè)有效邊中受到的電磁力的方向一致,電樞開始轉(zhuǎn)動(dòng)。通過實(shí)時(shí)過電流保護(hù)與管理,它還可以減少外圍器件的數(shù)量。通過換向器可以實(shí)現(xiàn)線圈的有效邊從一個(gè)磁極如N極轉(zhuǎn)到另一個(gè)磁極下如S極時(shí),電流的方向同時(shí)發(fā)生改變,從而電磁力或電磁轉(zhuǎn)距的方向不發(fā)生改變。電磁轉(zhuǎn)距是驅(qū)動(dòng)轉(zhuǎn)距,其大小也為:T=KTΦIa。電動(dòng)機(jī)的電磁轉(zhuǎn)距T必須與機(jī)械負(fù)載轉(zhuǎn)距T2及空載損耗轉(zhuǎn)距T0相平衡。即T=T2+ T0
福州卓凱電子科技有限公司
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