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Originally Posted by indieFan
There were three motors that were run off of the same battery pack. Two of them appear identical. Since the third was different, wouldn't the normal operating voltage be dependent on the voltage division created by the electronics of the truck? If this is the case, can just looking at the resistors and tracing where the leads go on the board serve as the information for calculating the necessary voltage division?
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That depends. While it is possible to measure the internal resistance of each component in the circuit, and then reconstruct the circuit design to determine the voltage drop across each component and motor, it will be a tedious job at best. You need to worry about the voltage drop across each motor, not just the fraction of the total voltage in each leg of the circuit. In some cases, depending on the exact components in the circuit, it may not be practically possible to determine this.
For the specific problem you are posing, I would probably forget all the detailed circuit reconstruction. Just divide the total voltage provided by the battery pack by 3, hook up one of the motors, turn it on for a short period of time, and watch it carefully to make sure it is not overheating or spinning so fast that it seems out of control. If everything seems OK, go ahead and connect it to the test rig and turn it on longer while collecting data. If the motor does start to get warm, drop the voltage by 20-25% and try again until you get into a comfortable operating range.
-dave