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Originally Posted by Paul Copioli
All,
The thing that bothers me the most is the engineer from Mabuchi did not jump up and down and say, "No way! Do not use it at 12 volts or you will destroy the motor." In my experience, however, the motor will fry near stall conditions at 12 volts.
-Paul
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Mabuchi motors that we have used have also fried near stall conditions. We have not limited the voltage on them, in years past. They definitely don't like to be stalled when full power is being asked for. They tend to give up and let out their white smoke.
So... what we will probably do is run this thing at a maximum of 9.6 volts, as the engineer from Mabuchi suggested. At this stepped-down voltage, we will see these numbers:
2005 Fisher-Price at 9.6 volts
free speed: 19,200 rpm
max power: 325 Watts
stall torque: .518 N-m
Looking at these numbers, at this lower voltage, this motor is less powerful than the 2003-04 drill motor (free speed 19,670, 448 Watts, 0.87 Nm stall torque). It is strikingly similar to the 2002 drill motor (20,000 rpm, 340 watts, 0.65 Nm)
Does this seem reasonable?
Andy B.