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Forum Index : Windmills : Rare Magnent Problem

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dwyer
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Joined: 19/09/2005
Location: Australia
Posts: 574

Posted: 11:52pm 23 Jul 2006

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HI EVERYONE
I an having some problem with rare neodymium lron boron magnent that l have fitted to the 90 amp alt after machine down and glue the magnent on the amateur however when l this working running 1000 rpm not much voltage nor amps came out as l was very disapoint 3 volt that all l get and l belive is problem on the magnent is NORTH and SOUTH Pole which is wrong way around but is not . this is second made all the same problem Has anyone having same problem ?? Need some adivse .
Here the picture to look at

Dwyer the bushman

Gizmo

Admin Group

Joined: 05/06/2004
Location: Australia
Posts: 5078

Posted: 12:08am 24 Jul 2006

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Thats a weird one. Is it possible the magnets were made wrong, poles are at each end instead of each face. If you have a spare magnet, try moving it across the magnets to make sure there isn't a pole reversal across the face.

Glenn

The best time to plant a tree was twenty years ago, the second best time is right now.
JAQ

brucedownunder2
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Joined: 14/09/2005
Location: Australia
Posts: 1548

Posted: 07:53am 24 Jul 2006

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Hi Dwyer, I'd gently prise the magnets from their seatings and re-arrange them so they are all North-South-North-South sort of position--maybe you've allready done this- ,, so dunno. Anyway somethings bugger-up ,Ol,Mate
Bruce

Bushboy

Prof

Newbie

Joined: 01/12/2005
Location: Australia
Posts: 33

Posted: 11:38am 24 Jul 2006

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Hi Dwyer,

Can not add much to the replies already made. Love the background to your photo however. Is the table cloth hand made or just a reproduction?? My support person would never let me use such an heirloom to help display my creations. I think Bruce is on the right track.

Prof.

I know boats!!

Megawatt Man

Senior Member

Joined: 03/05/2006
Location: Australia
Posts: 119

Posted: 07:59am 25 Jul 2006

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Is the overall diameter of the rotor the same now as it was when it was an electromagnet? It is crucial that the air gap be a small as possible.

1000 rpm is not fast for an alternator of this type, in normal automotive service it would range up to maybe 5,000 rpm.

Then there's the magnets although your post says you have already checked that. I am sure you know that the direction of magnetisation is across the thin faces.

If all these things are OK, I would start looking at whether the normal winding produces a greater magnetic field strength that the neos.

Megawatt Man

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