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 Don't be affraid of trying new things... Even if people say you are crazy, even if you get insulted, even if it involves a lot of time and money, try it. You can't know if it'll work or not if you didn't try it yet. - EDesbiens [more] |
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#12
14-10-2008, 23:39
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Re: Motor Testing
At the risk of sounding like a hack, I am sure that the good FIRST students can figure out some good enough way to produce a given torque and a good enough way to compensate for supply sag. This isn't rocket surgery, and the first order linear model of a brushed DC motor is good enough for anything we do here.
Claiming that this is too difficult for a FIRST student is simply begging to be proven wrong. I'm betting it can be done entirely with KoP items and some creativity. A brushed DC motor is a resistor, an inductor, and a voltage source proportional to speed, all in series. Current through the motor is proportional to torque. The voltage and current constants are equal to each other. If you can measure current, voltage, speed and torque in several conditions AND do a small bit of math, you can find these constants. |
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