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Originally Posted by bondo
the spiral/slotted arm also let's the motor run cooler.
the spiral acts as a corkskrew pulling air through the end bell and the slots allow more cooling since there's less mass to hold heat.
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Exactly! Also, it does reduce electromagnetic permeability according to CreativeSN. Here's proof.
Quote:
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Originally Posted by CreativeSN
Thus the lower the magnetic interaction between the coils and magnets, the faster the motor.
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Quote:
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Originally Posted by CreativeSN
The slots reduce the electro-magnets permeability, and thus reduce the magnetic strength making the motor spin faster.
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source
Also, the lower magnetic strength reduces back-voltage, not friction. Sorry about that.