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Forum Index : Windmills : Butchering a F&P Stator (Son of F&P)
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waggawind Newbie  Joined: 17/07/2008 Location: AustraliaPosts: 18 |
Has anyone considered cutting individual pole pieces from the f&p stator to make a 6 pole single phase design or a 9 pole 3 phase? I want something small for the ryobi mill and having 10 f&p stators lying around, wondered if its possible. Some of you will probably be horrified at this thought but it could make a cheap alternator with a bit of work. I had a look last night at one and the conclusion was that it would take some effort. Also need to make a new smaller rotor design maybe with neo magnets. Don't get me wrong. I love the F&P motor as it is but want to reduce the physical size. Cheers Alf Somewhere on the Murrumbidgee |
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fillm Guru  Joined: 10/02/2007 Location: AustraliaPosts: 730 |
It would be a whole lot easier to start from scratch or look at rewiring and modifing a car or truck alt I would think.. PhillM ...Oz Wind Engineering..Wind Turbine Kits 500W - 5000W ~ F&P Dual Kits ~ GOE222Blades- Voltage Control Parts ------- Tower kits |
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| brucedownunder2 Guru Joined: 14/09/2005 Location: AustraliaPosts: 1548 |
If you are near a car wreckers, see if you can get a large electric fan motor ,I know BMW have large fan motors (radiator ) that just maybe what you require. What Phill says is a way to go also,24v truck alternators-check out the posts from Matt ,couple years back , he made one for when he was camping on the beach during fishing trips ..wind is most of the time available,there. He replaced the field windings with Neo magnets. Bruce Bushboy |
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| waggawind Newbie Joined: 17/07/2008 Location: AustraliaPosts: 18 |
I have a set of thermofans out of a falcon but they are dc motors with brushs and commutator. Would still prefer an AC machine over DC. I have a couple of old bosch alternators kicking around but the thought of machining and rewiring was more than I could handle (I don't have a lathe). I'll see if I can find Matt's post about the modified alternator. Cheers Alf Somewhere on the Murrumbidgee |
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| waggawind Newbie Joined: 17/07/2008 Location: AustraliaPosts: 18 |
Had a look at Matt Lyons truck alternator mod. Very nice but still some machining required. I saw another modified alt of the web with a ferrite ring magnet placed inside the rotor core (coil removed). Has anyone tried that and also has anyone tried the ring magnet from a magnatron (microwave)inside a alt rotor? Somewhere on the Murrumbidgee |
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Gizmo Admin Group  Joined: 05/06/2004 Location: AustraliaPosts: 5119 |
Kiwijohn ( and I think others ) have experimented with cutting up a stator. John did it for his exercise bike to reduce the iron losses. If you have a smaller windmill/power source, then the iron losses in the F&P can significantly reduce its power output. If you cut out some of the poles, then you reduce the iron losses and make a more efficient alternator at a lower power output. You still use the same hub and mounting, and it might be a good idea to spread the remaing poles evenly around the circumference to reduce warping of the hub. Glenn The best time to plant a tree was twenty years ago, the second best time is right now. JAQ |
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| waggawind Newbie Joined: 17/07/2008 Location: AustraliaPosts: 18 |
Thanks for the info Glenn. I have just removed 9 individual poles from the stator using a bandsaw and hacksaw. I will make 2 plates that each pole will attach too. One plate will will attach to the top and one to the bottom of the 9 poles. I will attempt to use the holes that are already punch thru each laminated piece of iron. Not sure how it will all work but if it mounts ok, I'll post some photos. I will also fit spacers between each pole piece to keep them evenly gapped and secure. I will make a new rotor with increased spacing between each magnet to suit the windings. I will also rotate the magnets a number of degrees to reduce the cogging effect. I get where your coming from with Kiwi Johns design. He would have removed the poles from the pole tip towards the centre (like missing teeth). I cut from the centre of the stator assy up into the Iron core and stopped just short of the copper wire. If you have any ideas in regard to angle of magnets or the number of poles,let me know. I may even consider 12 poles. Cheers Alf Somewhere on the Murrumbidgee |
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GWatPE Senior Member  Joined: 01/09/2006 Location: AustraliaPosts: 2127 |
Disecting the stator and rebuilding with individual pole pieces? It will be difficult to regain the magnetic path in the iron like the original stator. The pole to magnet gap will be critical. You may still need to rewind with different wire. Gordon. become more energy aware |
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| waggawind Newbie Joined: 17/07/2008 Location: AustraliaPosts: 18 |
Cheers Gordon. I think the only way to be sure is to try it and see how it performs. You're right about the flux path being cut with the individual laminations. I settled on a 12 pole 16 magnet design but judging on the gaps between the windings I could go higher. Maybe a 18 pole 24 magnet may do better. I'll play and see what I can come up with. Alf Somewhere on the Murrumbidgee |
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