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I have been googling a fair amount to plan the next project and according to google;
hyper9 hv at 500amps = 173ft/lbs
impulse9 at 450amps = 70ft/lbs

I'm reasonably certain that the hyper9 is not over twice as powerful as the impulse9 so these numbers must be screwey

does anyone have any more reliable information?
I would think they would have very similar power and torque graphs:unsure:
 

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What do you mean by "powerful"? Electrical power is current multiplied by voltage, and you haven't mentioned the voltage needed to push these currents. Mechanical shaft power is torque multiplied by rotational speed, and you haven't compared the maximum speeds at which these motors can produce the listed torque.

It's entirely reasonable that two motors of similar size may produce very different amounts of torque at the same current; even if they had the same general design, simply winding one with more turns of finer wire would do that. Their power and torque graphs would only be similar if they were designed to be similar. Of course it doesn't help that NetGain and others don't publish performance data for their brushed DC motors (or even test them) at any speed below the peak torque speed.

Also, without checking the unlisted source of information, I don't even know if the listed current for the HyPer 9 is motor phase current (RMS?) or DC link current - it might not even be an equivalent measure to the DC current through the brushed DC motor, or supplying the DC motor's controller.
 
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