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Forum Index : Windmills : coils and magnets
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niall1 Senior Member  Joined: 20/11/2008 Location: IrelandPosts: 331 |
this is something i,d like to understand about coils and flux ...Arewa,s post has made me think about it... most axial coil and magnet layouts seem to be north pole on one leg ...south pole on the other and the poles then alternate ...2 mags to one coil what about one pole ...one coil ?...if the whole coil experiences a "north" flux and then a "south flux" ....is this how the f&ps work ? niall |
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Tinker Guru  Joined: 07/11/2007 Location: AustraliaPosts: 1904 |
Niall, magnetic flux travels between N&S poles. Any magnet will have two poles (N&S), if you break it in half you get 2 magnets, each having a N&S pole. In The F&P (do you have one) there are more than one pole per magnet tile. These create a magnetic path from the N face area to the iron pole shoe opposite it, through the iron to the next pole and back to the S face on the tile. You need a small bar magnet and move it along the F&P magnet tiles (rotor removed from stator) to see exactly how they are magnetized. Its an odd arrangement but it works. For a coil to generate electricity it has to move - cut through the magnetic field - (or the magnets move instead) between the N&S poles of a magnet (permanent or electromagnet). Klaus |
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| niall1 Senior Member Joined: 20/11/2008 Location: IrelandPosts: 331 |
hi Klaus unfortunately we dont have f&ps here ..  ,but i think i understand what you mean by 2 poles per tile
what about this in an axial ....say a flat coil was made up with a hole equal in size to the magnet... when two n/s magnets aligned (moved) opposite the hole sides youd have a field generated across and through the coil ....now these would leave and another pair of s/n magnets would enter the coil and reverse the field ? kind of like this but without the core and a squashed coil 
thanks for your help... niall |
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shawn Senior Member Joined: 30/03/2010 Location: New ZealandPosts: 210 |
If your not in any hurry when i come over i will bring you a few to play with. |
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| niall1 Senior Member Joined: 20/11/2008 Location: IrelandPosts: 331 |
we can sell one before you go back ....should make a very fair price ....they,d be highly prized over here ...  niall |
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MacGyver Guru Joined: 12/05/2009 Location: United StatesPosts: 1329 |
naill1 You have to remember to not allow a north face and a south face to pass the same wire in the same plane of rotation or each will generate the same current, but in opposite directions creating a net "zero" charge on the wire. As soon as I get my shop back (27 days!) I will be building an interesting contraption, which will be a three-phase alternator with only one magnet wheel and coils laced about both sides so as to produce current in the same direction even though one side of the same wire sees a N and the same wire but on the opposite side see a S. I'll make some drawings and toss them up when the time comes, so everyone can understand the basic principles. In the mean time, it may do you well to review the electricity section of a high school or college physics text. Either will explain the left-hand and right-hand rule among other things, which help a lot when you are designing things. By the way, I owe my electrical knowledge to college, but most of my "understanding" came from the school of Oz (John Tulloch -- Flinders Island, Taz.)! . . . . . . Mac Nothing difficult is ever easy! Perhaps better stated in the words of Morgan Freeman, "Where there is no struggle, there is no progress!" Copeville, Texas |
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Gizmo Admin Group  Joined: 05/06/2004 Location: AustraliaPosts: 5078 |
 Those days are counting down MacGyver, wont be long now. The best time to plant a tree was twenty years ago, the second best time is right now. JAQ |
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| niall1 Senior Member Joined: 20/11/2008 Location: IrelandPosts: 331 |
hi Mac erm...i think i threw that physics book into the lake when i finished school ... your right ...i wouldn't mind having it here now ....and look at the basics ,ohm was in there a lot i remember .... it was a big book in the bag .... 
pity Oz didnt teach physics ...would have made for a very entertaining hour during the week ... niall |
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