哈爾濱廢鐵回(hui)收提示(shi)您直流發電(dian)(dian)(dian)機的(de)工作原(yuan)理就是把電(dian)(dian)(dian)樞線圈中感應(ying)的(de)交(jiao)變電(dian)(dian)(dian)動(dong)勢(shi)，靠換向(xiang)(xiang)器配合電(dian)(dian)(dian)刷的(de)換向(xiang)(xiang)作用，使之(zhi)從(cong)電(dian)(dian)(dian)刷端引出時變為(wei)直流電(dian)(dian)(dian)動(dong)勢(shi)的(de)原(yuan)理。

　　感應電動勢的(de)方向(xiang)(xiang)按右手定則確定（磁感線(xian)指(zhi)向(xiang)(xiang)手心(xin)，大拇指(zhi)指(zhi)向(xiang)(xiang)導體運動方向(xiang)(xiang)，其他四指(zhi)的(de)指(zhi)向(xiang)(xiang)就是導體中感應電動勢的(de)方向(xiang)(xiang)）。

　　導體受力的(de)(de)方(fang)向(xiang)(xiang)用左手(shou)定(ding)則確定(ding)。這一對電(dian)(dian)(dian)磁(ci)力形成(cheng)了作用于電(dian)(dian)(dian)樞(shu)(shu)一個力矩(ju)(ju)，這個力矩(ju)(ju)在(zai)旋轉(zhuan)(zhuan)電(dian)(dian)(dian)機里稱為(wei)電(dian)(dian)(dian)磁(ci)轉(zhuan)(zhuan)矩(ju)(ju)，轉(zhuan)(zhuan)矩(ju)(ju)的(de)(de)方(fang)向(xiang)(xiang)是逆(ni)時(shi)針(zhen)方(fang)向(xiang)(xiang)，企圖使(shi)電(dian)(dian)(dian)樞(shu)(shu)逆(ni)時(shi)針(zhen)方(fang)向(xiang)(xiang)轉(zhuan)(zhuan)動。如(ru)果此電(dian)(dian)(dian)磁(ci)轉(zhuan)(zhuan)矩(ju)(ju)能夠克服(fu)電(dian)(dian)(dian)樞(shu)(shu)上的(de)(de)阻(zu)轉(zhuan)(zhuan)矩(ju)(ju)（例如(ru)由(you)摩(mo)擦(ca)引起的(de)(de)阻(zu)轉(zhuan)(zhuan)矩(ju)(ju)以及其它負(fu)載轉(zhuan)(zhuan)矩(ju)(ju)），電(dian)(dian)(dian)樞(shu)(shu)就(jiu)能按(an)逆(ni)時(shi)針(zhen)方(fang)向(xiang)(xiang)旋轉(zhuan)(zhuan)起來。