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03.18.2011, 10:05 AM
Have you ever taken a motor, short the phases together (not hooked to an ESC or anything), and try turning the shaft by hand? Well, that's basically how it works. Except and ESC will quickly turn on and off the "short circuit" giving you variable braking. When the short-circuit is removed during one of these pulses, the stored energy in the motor charges the battery.
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