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1. 08:07 AM - Alternator problems (Robert L. Nuckolls, III)
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| Subject: | Alternator problems |
At 06:31 PM 7/2/2014, you wrote:
>Bob,
>
>I have been reading your book The AeroElectric Connection which is very
>informative. I have a couple of issues.
>
>First, I have a Sonex with an AeroVee engine (VW) with a permanent magnet
>alternator. Something is not working because the battery goes dead. When I
>go to start the engine my Grand Rapids EIS shows 12.3 volts, after I have
>charged the battery. After I start the engine the voltage goes to 12.1. At
>wide open throttle it shows 12.2. After I shut down the engine it showed
>12.3
>
>I put a brand new regulator/rectifer from Sonex in the plane. There is
>continuity between the two wires coming from the stator. There is no
>continuity between either wire and any of the poles of the stator.
The winding is open.
>
>When I put my multimeter on the two wires coming from the stator, it showed
>AC voltage in the 175 volt range at wide open throttle.
AC voltage readings on modern multi-meters have to
be tempered with the knowledge that their input
impedance is very high . . . they will detect
AC voltages on conductors in close proximity to
some 'activity' but are in fact not capable of
carrying any power . . . broken.
>
>If figured if I was getting that many volts I would run a test to see if it
>would light a light bulb. It did not.
Paragraph above confirmed.
>
>Clearly something is rotten in Denmark, or New Hampshire as the case maybe.
>
>I am open to any help/suggestions as the testing or rectifying (so to speak)
>of the problem.
Stator winding is open somewhere. Does it look over-heated
or smell 'cooked'?
>
>Second issue. Antennas. In your book page 13-24 you talk about the poor
>mans coax termination. You say to keep the distance between the center
>wire and the shielding ground wire as short as possible. My question is
>what can the distance be before it is not effective?
It's ALWAYS effective with deleterious effects
being a matter of degree.
> By distance I assume
>that you mean the distance between the end of the center wire and the place
>where you strip off the shielding wire. I would like to build my own
>antenna, but it seems somewhat daunting.
How about this? http://tinyurl.com/madgr9v
>
>Thanks for any help. Really liked your book.
I'm pleased that you found it useful. Suggest you
join us on the AeroElectric List . . . a forum of
with about 1500 other builders wrestling with the
same questions you are . . .
Bob . . .
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