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So very interesting. Thanks for all the replies. So what I got is that a motor manufacturer thinks approximately like this: First they send increasing current through the motor and measure how hot it gets and when it get's as hot as they think should be the maximum heat they read the amps sent...

Hi, If a hub motor is rated at 250W what does this actually mean? I would assume that the voltage applied to motor windings can be somewhat arbitrary. (Even windings from a transformer made from very thin wire is often rated at 110V). So if this is correct then I assume it's only the current...