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Yes you can improve it by more voltage, to physical limits. On my dc series brush arc increases until the arc goes all around the commutator until it hits the opposite pole then it becomes a zorch.
On an induction motor eventually you either overheat or experience dielectric breakdown.
Also: most power motors have physical rpm limits. Series dc has the lowest for size due to all that wire mass in the armature
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casual notes from the underground:There are some "experts" out there that in reality don't have a clue as to what they are doing.
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