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Some general rules of thumb.

For a given diameter wire, if you reduce the number of turns (windings on the armature) the RPM goes up and vice versa

For a given number of turns, if you increase the diameter of the wire you increase the torque and vice versa.

The torque is a function of the current flowing through the wire, the number of turns and the magnetic strength of the magnets.

Advancing the comm timing with respect to the armature stack will generally increase RPM (up to a point) at a slight cost of torque.

What is the max voltage?? Its a number of factors that determise this. Insulation break down in the wires, max design RPM before things start to fly apart, ability to dissipate power (heat generated). etc.

hope that helps.

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