Same direction (SD) opposite (OD)
$C = C_W + C_E. . .(SD)$
$C = C_W – C_E . . .(O.D)$
$C = C_W + C_E$

$C_w = 4 Iw .W_w.w_p$
$C_E = I_E . W_E . W_p$
$C = 4IW + W_w . w_p \pm I_E. W_E . W_p$
Gear …
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