Thanks for the info! I have questions:
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In your motor/generator pair:
(1) Make both the motor and generator the same type of motor.
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Why is it important to use to of the same type motor instead of an "unkonwn" motor as the test and a known motor (one you have power curves for) for the load motor/generator?
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(2) Wire a power resistor across the generator's electrical "outputs". Be careful to size the resistor properly.
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What it the power resistor used for? Is this so that the generator now acts like a brake? Or am I missing the point and the point is not to actually load/brake the test motor. How do you determine the proper size power resistor? I am not an electronics person. I am more of a mechanical guy.
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(3) Measure the voltage and current at the "input" and "output". Also measure the speed at the spindle/coupler.
(4) Adjust the input voltage to a known value (in our case it's almost always 12.0V). Note that you do not need a precision high current power supply... Just use an Exide SLA and let it slowly discharge as you run the MG and take your readings at 12V.
Note also that you can ignore (4) depending on exactly the type of data you are going for...
For a given load resistance, you will take your readings:
Input Power (W) = Input Voltage (V) * Input Current (A)
Output Power (W) = Output Voltage (V) * Output Current (A)
Mechanical Power at coupler (W) = [Input Power (W) + Output Power (W)] / 2
Torque at coupler (N*m) = Mechanical Power (W) / Spindle Speed (radians/sec)
Power Lost in Motor (W) = Input Power (W) - Mechanical Power at Coupler (W)
et cetera...
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Easy enough! I can handle that!
A BUNCH! Thanks Mike!