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I know this question has probably been asked a million times before, however, l am new to this, and am still learning. I have read that for example that a 24v 1000 watt motor has the same power output as lets say, a 48v, or 72v 1000 watt motor. Is this true, and ifso, why use a higher voltage motor? Is it because the higher voltages give higher torque? I am confused. Please let me know...thank you..
 

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Hi
Quick answer

Volts x Amps = Power

24 volts x 41.6 amps = 1000 watts
48 volts x 20.8 amps = 1000 watts
72 volts x 13.9 amps = 1000 watts

For a car you want say 100kW

24 volts x 4160 amps = 100kW -- that is FOUR THOUSAND AMPS!

So we use a higher voltage to keep the amps under control
 

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I'd like to ask about running a 24V PM motor on 12V. I know the motor will run at half speed. Is the power now a quarter of the power at 24V? And with a quarter of the torque?
 
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