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Originally Posted by eugenebrooks
If one motor is over driven by the other, it becomes a generator, in effect and saps power from the drive train to backfeed electrical
power in into the robots electrical system. This is easily demonstrated
by turning a motor by hand and watching the leds on robot control system.
You will see them light up.
If the over driven motor is sapping power from the mechanical drive
train, it is taking up power that would otherwise move the robot forward,
hence the loss in efficiency.
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Since I asked this question, I've taken a class at Purdue that dove into DC motor information. What you're saying is mostly correct. At the time, I was specificly looking for how to find the back-emf constant, that is, relating the amount of power loss quanitatively to RPM. I've come to discover that these coefficients are usually listed within motor specs from the manufacturer, and is essentially the torque constant for most of the motors that we'd see in FIRST.
Thanks for answering the question, though.
Matt