140DRA84000 Quantum
假設在電刷未通電的狀態下，線圈（轉子）沿逆時針方向旋轉。作為現實案例，有這種情況：當正在旋轉的電機的電源被切斷後，轉子由於慣性而繼續轉動。
在 的狀態下，線圈A位於磁體N和S的中間。由於磁體產生的磁場方向是從N到S，逆時針旋轉使線圈A接近磁體N，因此，向旋轉軸方向的磁通量變化在（+）處大（粉紅色箭頭）。結果，線圈A產生電動勢，該電動勢使電流（紫色箭頭）從旋轉軸向外側流動。
由於線圈B遠離磁體N，線圈C靠近磁體S，因此磁通量的變化變為（-）（粉紅色箭頭），並且磁通量的變化值由於位置靠近磁體而小於大值。結果，線圈B和線圈C產生電動勢，該電動勢使電流（紫色箭頭）從外側流向旋轉軸。
當此時的線圈A、B、C的電動勢合並時，相對於右電刷在左電刷中產生（+）電壓。
當變為 的狀態時，線圈B位於磁體N和S中間，並且由於其接近S，所以磁通量的變化在（-）處變為大。結果，線圈B產生電動勢，該電動勢使電流從外側流向旋轉軸。
由於線圈A靠近磁體N，線圈C遠離磁體S，所以磁通量的變化為（+），並且磁通量的變化值由於位置靠近磁體而小於大值。結果，線圈B和線圈C產生電動勢，該電動勢使電流從旋轉軸向外側流動。
當此時的線圈A、B、C的電動勢合並時，相對於電機右電刷在電機左電刷產生正電壓。
綜上所述，當線圈（轉子）逆時針旋轉時，相對於電機右電刷，總是在電機左電刷上產生（+）電壓。如果線圈順時針旋轉，則會因反向動作而在電機右電刷上產生（+）電壓。產生的電壓被換向器整流成直流電壓，並且發電電壓會隨著轉速的增加而提高。不言而喻，發電機就是基於這一原理制造的。
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