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hgerhardt
Joined: 18 Jul 2008
Posts: 3
Location: So Cal
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 Posted: Fri Jul 18, 2008 1:06 pm Post subject: ND Alternator Mod |
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After reading waaaay too much verbal abuse and other hand-wringing about the subject of internally-regulated alternator "dangers", I finally decided there has to be a better way than Kilovac contactors and transorbs or praying to various deities to making these things "safe".
Why not just modify the alternator in such a way as to prevent its ability to run away in the first place? One vendor in particular does it already, so I thought that if they can do it, surely it isn't impossible. So, I took my ND alternator apart one afternoon and stared at the pieces for a while. I also found manuals of the internal workings on the web and studied those too. I came up with a method, which I've attached here, that takes about an hour to accomplish and costs next to nothing. The modification makes it impossible for the alternator to "run away" (unless the 5A field breaker malfunctions). In a nutshell, what it does is remove the always-on B+ field feed and replaces it with power from the "IG" terminal. This way, all of the field current goes through the IG terminal. Pull the field breaker and there is no possible way for the field to get power any other way.
Heinrich Gerhardt
RV-6, flying
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| Description: |
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Denso Alternator mod.pdf |
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383.27 KB |
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2563 Time(s) |
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nuckolls.bob(at)cox.net
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| Posted: Fri Jul 18, 2008 2:11 pm Post subject: ND Alternator Mod |
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At 02:06 PM 7/18/2008 -0700, you wrote:
| Quote: |
After reading waaaay too much verbal abuse and other hand-wringing about
the subject of internally-regulated alternator "dangers", I finally
decided there has to be a better way than Kilovac contactors and transorbs
or praying to various deities to making these things "safe".
Why not just modify the alternator in such a way as to prevent its ability
to run away in the first place? One vendor in particular does it already,
so I thought that if they can do it, surely it isn't impossible. So, I
took my ND alternator apart one afternoon and stared at the pieces for a
while. I also found manuals of the internal workings on the web and
studied those too. I came up with a method, which I've attached here,
that takes about an hour to accomplish and costs next to nothing. The
modification makes it impossible for the alternator to "run away" (unless
the 5A field breaker malfunctions). In a nutshell, what it does is remove
the always-on B+ field feed and replaces it with power from the "IG"
terminal. This way, all of the field current goes through the IG
terminal. Pull the field breaker and there is no possible way for the
field to get power any other way.
Heinrich Gerhardt
RV-6, flying
|
Heinrich has been gracious enough to favor us with a
document that describes the modification he's talking
about. This paper was not produced by Heinrich but
he promises that the next time he has another alternator
apart for modification, he'll take more pictures to
share with us.
In the mean time, here's the base-line document:
http://www.aeroelectric.com/articles/Nipon-Denso_Alternator_Mod.pdf
Thanks Heinrich!
Bob . . .
----------------------------------------)
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
----------------------------------------
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hgerhardt
Joined: 18 Jul 2008
Posts: 3
Location: So Cal
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| Posted: Fri Jul 18, 2008 5:07 pm Post subject: Re: ND Alternator Mod |
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Actually, Bob, I DID write that article you posted. My pictures aren't the greatest, but are good enough to get my points across and for a reasonably savvy homebuilder to perform the mod.
Heinrich Gerhardt
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nuckolls.bob(at)cox.net
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| Posted: Fri Jul 18, 2008 5:24 pm Post subject: ND Alternator Mod |
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At 06:07 PM 7/18/2008 -0700, you wrote:
| Quote: |
Actually, Bob, I DID write that article you posted. My pictures aren't
the greatest, but are good enough to get my points across and for a
reasonably savvy homebuilder to perform the mod.
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Sorry . . . I misunderstood. In any case,
than you for contribution. If you have occasion
to upgrade/revise the work, I'd be pleased to
offer it on the website.
Bob . . .
----------------------------------------)
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
----------------------------------------
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