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Re: PWM translates to movement?
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Also, if I am switching current on a solenoid quickly, to prevent arcing, is it possible that I hook up two diodes in parallel but in opposite directions? is there a better solution to this other than using diodes? I know people use diodes to lessen the EMF from the collapsing field, but if im constantly creating, destroying fields, how would I handle the EMF? with currents up to something like 40 amps..
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I would recommend a transorb/transient voltage suppression diode. In fact the circuit symbol is two diodes attached in series with opposing polarity.
http://en.wikipedia.org/wiki/Transorb
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FIRST allowed caps for the first time this year to be placed across the motor leads. Some motors caused some significant problems in the servo PWM feeds to cameras. The caps were allowed to try and solve that problem. I have not received any reports but one team that used this approach and it was not conclusive.
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Capacitors do help with the EMF from motors. I have measured this with an oscilloscope and a current sensor. The current waveforms improved when I placed the capacitor and degraded when I removed them. Of course this wasn't with any motor that FIRST uses and the capacitor bank was fairly large.
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If either a public officer or any one else saw a person attempting to cross a bridge which had been ascertained to be unsafe, and there were no time to warn him of his danger, they might seize him and turn him back without any real infringement of his liberty; for liberty consists in doing what one desires, and he does not desire to fall into the river. -Mill
Last edited by Adam Y. : 06-07-2007 at 16:44.
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