Today's Message Index:
----------------------
1. 05:56 AM - Re: Stator (user9253)
2. 06:14 AM - Re: Stator (user9253)
3. 01:39 PM - Re: Stator (Jim Kale)
4. 04:35 PM - Re: Stator (Jan)
5. 06:08 PM - Re: Stator (Robert L. Nuckolls, III)
6. 06:34 PM - Re: Stator (David Lloyd)
7. 07:35 PM - Re: Stator (Robert L. Nuckolls, III)
8. 07:42 PM - Re: Stator (Jan)
Message 1
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I am curious to know the purpose of rewinding the alternator. Is the winding open
or partially shorted? Is the winding stationary and permanent magnets rotate
with the engine? Is a new winding available from Sonex at a reasonable price?
Maybe the same winding is available from Briggs & Stratton or Tecumseh.
The stator of an alternator is usually pretty robust and unlikely to fail. What
are the symptoms that suggest that winding replacement is necessary? Or is
the goal to improve the alternator output?
Joe
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=430911#430911
Message 2
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Here are some sources for magnet wire:
http://www.magnet4less.com/?cPath=9
http://www.powerwerx.com/wire-cable/magnet-wire.html
It is also available at eBay and Amazon and Digikey.
Joe
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=430912#430912
Message 3
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That is a single phase alternator. The windings in this photo look
perfectly good. The only reason to rewind one would be if the windings
were somehow damaged or shorted internally somewhere. The big factor on
rewinding is to get the correct size wire and then make sure the direction
of the turns on each element are correct. Normally the winding direction is
reversed on every other element. Since these windings don't turn, there is
no problem with the wire being thrown off by centrifugal force. I agree
with the other advice though. It would be much easier all around to just
get a new one.
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Robert L.
Nuckolls, III
Sent: Sunday, September 21, 2014 6:03 PM
Subject: Re: AeroElectric-List: Stator
At 16:47 2014-09-21, you wrote:
<mailto:skywagon@charter.net> >
Tom,
I do not know anything about the alternator used on your engine.
However, I would bet that it is used in many other applications, such that
you could find the replacement instead of going thru the trouble of a
rewind. Example, Most Cessna alternators and regulators are really Ford
products. D
Tom's alternator isn't anything like you'd
find on a Cessna . . .
It's a permanent magnet alternator with windings
that look something like this . . .
Bob . . .
Message 4
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It is easy testing the stator with a isolation and continuity test. No point
rewinding it if that test is ok. Visually the stator looks fine. Maybe the r
otor has been so hot that the permanent magnets have partly demagnetised. Yo
u need some green magnet paper or a gaus meter to verify even magnetisation o
f you pm rotor
All the best
Jan
> On Sep 23, 2014, at 4:36, Jim Kale <jimkale@roadrunner.com> wrote:
>
> That is a single phase alternator. The windings in this photo look perfec
tly good. The only reason to rewind one would be if the windings were some
how damaged or shorted internally somewhere. The big factor on rewinding i
s to get the correct size wire and then make sure the direction of the turns
on each element are correct. Normally the winding direction is reversed on
every other element. Since these windings don=99t turn, there is no p
roblem with the wire being thrown off by centrifugal force. I agree with t
he other advice though. It would be much easier all around to just get a ne
w one.
>
> From: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelect
ric-list-server@matronics.com] On Behalf Of Robert L. Nuckolls, III
> Sent: Sunday, September 21, 2014 6:03 PM
> To: aeroelectric-list@matronics.com
> Subject: Re: AeroElectric-List: Stator
>
> At 16:47 2014-09-21, you wrote:
>
et>
>
> Tom,
> I do not know anything about the alternator used on your engine.
> However, I would bet that it is used in many other applications, such that
you could find the replacement instead of going thru the trouble of a rewin
d. Example, Most Cessna alternators and regulators are really Ford products
. D
>
>
> Tom's alternator isn't anything like you'd
> find on a Cessna . . .
>
> <image001.jpg>
>
> It's a permanent magnet alternator with windings
> that look something like this . . .
>
>
> Bob . . .
Message 5
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At 18:34 2014-09-22, you wrote:
>It is easy testing the stator with a isolation and continuity test.
>No point rewinding it if that test is ok. Visually the stator looks
>fine. Maybe the rotor has been so hot that the permanent magnets
>have partly demagnetised. You need some green magnet paper or a gaus
>meter to verify even magnetisation of you pm rotor
The picture I posted for the PM alternator stator was
and exemplar NEW device. I think the stator that
started this thread was toast. They're not hard to rewind
as long as care is taken to insure insulation integrity
between windings and the stator core. Hopefully his
original core was powder coated and not damaged.
Bob . . .
Message 6
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One of the oddest stator failures I have ever witnessed was a hairline
crack in the stator wiring that only opened when the alternator group
reached a certain temperature. In that case, it was where the end of
the heavy stator wire was swaged into the case for grounding. I think
the wire was stressed during manufacture and the fault did not fully
materialize until much later.
When the alternator was reviewed and bench tested no failure could be
found. On the test stand it was not subject to the temps needed to open
the fault. . !!
It was an old grey haired, very wise, electrical alternator wizard guy
that unraveled that mystery.
-------------------------------------------------------------------------
-------
----- Original Message -----
From: Jan
To: <aeroelectric-list@matronics.com>
Sent: Monday, September 22, 2014 4:34 PM
Subject: Re: AeroElectric-List: Stator
It is easy testing the stator with a isolation and continuity test. No
point rewinding it if that test is ok. Visually the stator looks fine.
Maybe the rotor has been so hot that the permanent magnets have partly
demagnetised. You need some green magnet paper or a gaus meter to verify
even magnetisation of you pm rotor
All the best
Jan
On Sep 23, 2014, at 4:36, Jim Kale <jimkale@roadrunner.com> wrote:
That is a single phase alternator. The windings in this photo look
perfectly good. The only reason to rewind one would be if the windings
were somehow damaged or shorted internally somewhere. The big factor
on rewinding is to get the correct size wire and then make sure the
direction of the turns on each element are correct. Normally the
winding direction is reversed on every other element. Since these
windings don=99t turn, there is no problem with the wire being
thrown off by centrifugal force. I agree with the other advice though.
It would be much easier all around to just get a new one.
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of
Robert L. Nuckolls, III
Sent: Sunday, September 21, 2014 6:03 PM
To: aeroelectric-list@matronics.com
Subject: Re: AeroElectric-List: Stator
At 16:47 2014-09-21, you wrote:
<skywagon@charter.net>
Tom,
I do not know anything about the alternator used on your engine.
However, I would bet that it is used in many other applications,
such that you could find the replacement instead of going thru the
trouble of a rewind. Example, Most Cessna alternators and regulators
are really Ford products. D
Tom's alternator isn't anything like you'd
find on a Cessna . . .
<image001.jpg>
It's a permanent magnet alternator with windings
that look something like this . . .
Bob . . .
Message 7
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At 18:34 2014-09-22, you wrote:
>It is easy testing the stator with a isolation and continuity test.
>No point rewinding it if that test is ok. Visually the stator looks
>fine. Maybe the rotor has been so hot that the permanent magnets
>have partly demagnetised. You need some green magnet paper or a gaus
>meter to verify even magnetisation of you pm rotor
The picture I posted for the PM alternator stator was
and exemplar NEW device. I think the stator that
started this thread was toast. They're not hard to rewind
as long as care is taken to insure insulation integrity
between windings and the stator core. Hopefully his
original core was powder coated and not damaged.
Bob . . .
Message 8
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Always a good thing to test at operating temperature. Just stick it in a ove
n .. Or outside in a black box in the sun .... :-) .. Poor mans heat chamber
... Then do your readings ...
All the best
Jan
> On Sep 23, 2014, at 9:33, David Lloyd <skywagon@charter.net> wrote:
>
> One of the oddest stator failures I have ever witnessed was a hairline cra
ck in the stator wiring that only opened when the alternator group reached a
certain temperature. In that case, it was where the end of the heavy stato
r wire was swaged into the case for grounding. I think the wire was stresse
d during manufacture and the fault did not fully materialize until much late
r.
> When the alternator was reviewed and bench tested no failure could be foun
d. On the test stand it was not subject to the temps needed to open the fau
lt. . !!
> It was an old grey haired, very wise, electrical alternator wizard guy tha
t unraveled that mystery.
>
> ----- Original Message -----
> From: Jan
> To: <aeroelectric-list@matronics.com>
> Sent: Monday, September 22, 2014 4:34 PM
> Subject: Re: AeroElectric-List: Stator
>
> It is easy testing the stator with a isolation and continuity test. No poi
nt rewinding it if that test is ok. Visually the stator looks fine. Maybe th
e rotor has been so hot that the permanent magnets have partly demagnetised.
You need some green magnet paper or a gaus meter to verify even magnetisati
on of you pm rotor
>
> All the best
>
> Jan
>
>> On Sep 23, 2014, at 4:36, Jim Kale <jimkale@roadrunner.com> wrote:
>>
>> That is a single phase alternator. The windings in this photo look perfe
ctly good. The only reason to rewind one would be if the windings were som
ehow damaged or shorted internally somewhere. The big factor on rewinding i
s to get the correct size wire and then make sure the direction of the turns
on each element are correct. Normally the winding direction is reversed on
every other element. Since these windings don=99t turn, there is no p
roblem with the wire being thrown off by centrifugal force. I agree with t
he other advice though. It would be much easier all around to just get a ne
w one.
>> From: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelec
tric-list-server@matronics.com] On Behalf Of Robert L. Nuckolls, III
>> Sent: Sunday, September 21, 2014 6:03 PM
>> To: aeroelectric-list@matronics.com
>> Subject: Re: AeroElectric-List: Stator
>> At 16:47 2014-09-21, you wrote:
>>
net>
>>
>> Tom,
>> I do not know anything about the alternator used on your engine.
>> However, I would bet that it is used in many other applications, such tha
t you could find the replacement instead of going thru the trouble of a rewi
nd. Example, Most Cessna alternators and regulators are really Ford product
s. D
>>
>>
>> Tom's alternator isn't anything like you'd
>> find on a Cessna . . .
>>
>> <image001.jpg>
>>
>> It's a permanent magnet alternator with windings
>> that look something like this . . .
>>
>>
>> Bob . . .
>>
>
>
> href="http://www.matronics.com/Navigator?AeroElectric-List">http://www.m
atronics.com/Navigator?AeroElectric-List
> href="http://forums.matronics.com">http://forums.matronics.com
> href="http://www.matronics.com/contribution">http://www.matronics.com/c
>
>
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