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Sandrag -
Did the motor performance specs on that spreadsheet come from actual measurements, theoretical calculations, or manufacturers specs? I ask because some of the numbers are suspect. Specfically, the free current ratings for the Bosch motors don't even come close to anything we saw when actually measuring currents.
The Bosch motors supplied this year are heavily biased for forward timing in the windings. We measured over a dozen different Bosch drill motors with a digital meter during the course of the season. When running under no load in the forward direction, we saw currents of 0.6 to 1.2 amps. However, when running in reverse we measured between 5.1 to 5.8 amps, based on the motor.
The 2.5 amps noted in the spreadsheet may be an attempt at an average value between forward and reverse. But it is probably not indicative of actual performance. That would also call into question the speed and torque values, unless these were actually measured values.
-dave
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