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Originally Posted by BrianG
Inductive kickback under braking can be fairly high, especially with higher turn motors. The exact amount depends on the inductance of the motor and the speed. I've generated over 2,000v pulses (measuring equipment didn't measure high enough) using a 9v battery on a 7 Henry inductor. Of course, that's quite a bit more inductance than these motors, but you get the idea.
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To generate similar voltage kick back high turn motor need to spin faster then low turn, that is way I was reffering as safer.