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Originally Posted by Random Dude
Well, the main problem I see with using r/c type speed controllers is speed. Now, I'm not sure what speed you are planning having your control loop running at, but r/c pwm signals are typiclally 50-60Hz.
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I dont think that will be the limiting factor - I think you will have a hard time finding a motor big enough to drive something like a segway, that has a resonant frequency (frequency response) as fast as 60Hz
the motor core has enough inertia that you might only get a 10 or 20 hz response out of it
so if you are changing the commanded power to the motor at anything faster than that, it wont have time to respond - in otherwords you would be wasting your money on a controller with a 200Hz response rate, if the motor can only respond at 10 or 20 Hz