描述
如何判定感生電動(dòng)勢(shì)的方向
判斷感生電動(dòng)勢(shì)方向的原則就是看A A’B B’CC’處的導(dǎo)線(xiàn)相對(duì)于內(nèi)轉(zhuǎn)子N極和S極的運(yùn)動(dòng)切割,不需要考慮導(dǎo)線(xiàn)內(nèi)的通道狀況。
從前面我們知道AB通電時(shí)內(nèi)轉(zhuǎn)子逆時(shí)針旋轉(zhuǎn)。此時(shí)Aa(a是AA’的中點(diǎn))這根導(dǎo)線(xiàn)相對(duì)于N極做順時(shí)針運(yùn)動(dòng),根據(jù)右手定則,N極發(fā)出磁場(chǎng)穿入手心,大拇指指向運(yùn)動(dòng)方向,四指所指方向就是感生電動(dòng)勢(shì)的正極,所以A側(cè)是正極。(拿出你的右手對(duì)著電機(jī)的等效示意圖自己判斷一下)
同理可以得出下圖左邊的感生電動(dòng)勢(shì)的方向圖。
感生電動(dòng)勢(shì)就相對(duì)于一個(gè)電池,正極就是電池的正極。
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