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How to calculate average wind speed for one month ? | 31 comments (31 topical, editorial)

Re: Sensing RPM off the output using a capacitor (3.00 / 0) (#12)
by DanOpto on Wed Jul 20th, 2005 at 02:37:18 PM MST
(User Info)

I suggest using a capacitor to isolate the signal from the generator output before the power diodes.
Load the capacitor with a resistor and clip the signal with a diode.
The output would then result in a pulse each time the magnets pass the coils.
You would have a pulse for each power peak.

Divide the pulses by the number of pulses in each revolution and you have your rpm without climbing the tower.

The capacitor limits the power and voltage feeding into the counter.
It also allows you to count pulses where there is voltage feeding into a battery that holds the base voltage 12 volts above ground.

[ Parent ]

Re: Sensing RPM off the output using a capacitor (3.00 / 0) (#16)
by Ungrounded Lightning Rod on Wed Jul 20th, 2005 at 05:50:10 PM MST
(User Info)

I'd do it the other way. Assuming ground is tied to the negative bridge output:
- Count on the bridge diodes to establish the ground level when the genny is running (and limit voltage excursions when it's idling or stopped).
- Run one AC phase through a several-K resistor to a node. From the node:
- Run a diode to ground (banded end at the node) to keep the node from going much negative of ground
- Run a string of back-to-back diodes to ground (banded end at ground) to limit the voltage to make a nice logic level. (About .6 volts per diode in the string).
- Also run a cap to ground to limit crud from switching. (RC time constant in the same ballpark as the highest frequency the genny is likely to put out.)

This should make the node have a pretty square wave at the genny frequency - with the negative level no more negative than -.6 and the positive level set by the number of diodes in the string - any time your genny is spinning above some point significantly below cutin.

[ Parent ]

How to calculate average wind speed for one month ? | 31 comments (31 topical, 0 editorial)

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