AS-B552-000
AS-B552-000
MBN1200D33A
電樞由原動(dòng)機(jī)驅(qū)動(dòng)在磁場(chǎng)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,承受短路能力以及dv/dt電流等參數(shù)有不同程度的影響。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(chǎng)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
這個(gè)變化的磁場(chǎng)通過鐵芯傳遞到副線圈,在副線圈里就產(chǎn)生了感應(yīng)電壓,于是變壓器就實(shí)現(xiàn)了電壓的轉(zhuǎn)變。
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)。 需要多個(gè)模擬系統(tǒng)電源管理的、復(fù)雜的高性能系統(tǒng)應(yīng)用中,數(shù)字電源則具有優(yōu)勢(shì)。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
地址:福州市閩侯西江濱大道77號(hào)正榮潤園一號(hào)樓1205室
大量現(xiàn)貨abb,施耐德等國外多家品牌,產(chǎn)品涉及變頻器,儀器儀表,變送器,可編程控制器plc和人機(jī)界面。
電話:15506917382 0591-62182535
傳真:0591-22989937 QQ:583745937 聯(lián)系人:王工
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