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PULLING more VOLTAGE but LESS amps for the same amount of power DOESN'T MAKE the motor cooler?????!? No, it makes the motor hotter
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I'm not sure if that's a question, sarcasm or you're mistaken about something. Let's make it clear:
The heat goes up with the square of the current - simple as that. There's always a big advantage in electrical power systems when you can reduce current, especially ebikes.
Power = volts x amps, so for the same power, if volts go up, the current goes down.
Also, motors don't pull voltage. You apply voltage and the voltage pushes current by convention, though, technically, the voltage makes a field that causes the current to flow though a conductor. You could argue that it pushes, pulls or sucks the current through. For the same motor, if you increase voltage, it increases the current (Ohm's Law), and it's the increase in current that causes more heat.
A motor with a high kV with a large reduction ratio will work the same as one with a low KV and high reduction ratio - same power, same voltage, same current and same heat. A high or large reduction ratio makes no difference in that respect. You just choose the reduction ratio to match the motor. If you were to use the same motor with a different reduction ratio, obviously there would be a big difference, but they're two different motors.