nuckollsr(at)cox.net
Guest
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 Posted: Sun Mar 19, 2006 8:24 pm Post subject: Any merit using a capacitor with ND alternator? |
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At 01:50 AM 3/20/2006 +0000, you wrote:
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Is there any merit using a 22,000mF capacitor with a SD-20s alternator and
a LR3C linear regulator as far as:
Keeping things stable if battery were to go off line (my main reason for
asking this question)?
Perhaps reducing some sort of noise?
Other?
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Rotax 914 internal generator and Ducati regulator/rectifier as per the
install manual have you install a 22,000mF capacitor. I think idea is not
only for noise control, but if the battery goes off line it will keep
things stable.
Rotax has an optional 40 amp ND alternator with internal regulator. I
suspect it is a switching regulator. Anyway as per the install manual have
you install a 22,000mF capacitor.
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Nope, if there was some benefit to be realized, we would have
included it in the recommended installation drawings. That
isn't to say that adding a capacitor won't reduce some noise
characteristics. It's just that the noise from a 3-phase,
wound field alternator is a known quantity that falls below
acceptable limits expected on a DC alternator/battery system.
See:
http://www.aeroelectric.com/Pictures/Curves/MSTD704_28V_Noise.jpg
These noise values are for a 28v system, half them for 14v.
Everyone who is a savvy supplier to the industry EXPECTS and
designs their products to live in this environment.
Should you encounter a device not designed to live in the real
world, it's usually easier to filter off the offending noise
at input to the victim as opposed to attacking it at the source.
Bob . . .
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