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Forum Index : Windmills : F&P stator coil count
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Gizmo Admin Group  Joined: 05/06/2004 Location: AustraliaPosts: 5116 |
Hiya I have a 36 pole stat/hub combo. Aluminum wire on the stator, black magnet hub. I'm contemplating rewiring the stator from scratch, with copper enabled wire, around 1mm to 1.2mm diameter. Would anyone know the turns per volt per rpm ratio for the 36 pole stators with black hubs? I did do a little test, but I dont think its that accurate. I wound 20 turns over the existing turns on one pole, and spun the hub at 60 rpm ( one revolution a second ), and got a reading of 0.7v peak to peak on my hand held cro. So thats 0.035 volts peak per turn. Seams a bit low. To get 50v peak on one leg of a phase, or 12 poles, I would need about 120 turns per pole. Thats a lot of work. So before I get started, just wanted to check if anyone knew the actual figures in case mine are out. Glenn The best time to plant a tree was twenty years ago, the second best time is right now. JAQ |
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| Gizmo Admin Group Joined: 05/06/2004 Location: AustraliaPosts: 5116 |
Actually, just thinking. I dont want cut in at 60rpm, more like 180rpm. So that divides the turns by 3. 40 turns per pole is more like it. The best time to plant a tree was twenty years ago, the second best time is right now. JAQ |
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Butcher Newbie  Joined: 03/04/2021 Location: New ZealandPosts: 7 |
Hello. I counted 114 turns per pole. This was on a 42 pole stator that uses 0.8mm copper wire. Look up the N squared relation for coils of wire... https://www.voltech.com/Articles/104-113/1__Introduction_to_Turns_Ratio I hope this helps. Edited 2021-04-05 09:58 by Butcher Testing, testing, ...1 ...2 ...3 |
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| Butcher Newbie Joined: 03/04/2021 Location: New ZealandPosts: 7 |
Furthermore, 36 pole Al wound stators have 190 turns, dia. 0.6mm. Edited 2021-04-05 13:29 by Butcher Testing, testing, ...1 ...2 ...3 |
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| Butcher Newbie Joined: 03/04/2021 Location: New ZealandPosts: 7 |
36 pole Cu is 194 turns @ 0.6mm. Testing, testing, ...1 ...2 ...3 |
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| Kamak Senior Member  Joined: 13/04/2021 Location: CanadaPosts: 150 |
I assume this is for the F&P stator? Yes it is sorry. So this answers my question about wondering if F&P's use aluminum wire. But is anyone using these new units with aluminum wire for wind turbines? I assume not? Edited 2021-04-16 12:45 by Kamak |
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| Butcher Newbie Joined: 03/04/2021 Location: New ZealandPosts: 7 |
Alluminium has a higher resistance than Copper. Al is also about 8 times cheaper than Cu (by mass). F&P uses better magnets (black rotor) with the Al wire stators. Cheaper. It saved them money. Using these black rotors with Cu is the way to go. Less resistance = greater efficiency = more energy for charging. Testing, testing, ...1 ...2 ...3 |
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| Butcher Newbie Joined: 03/04/2021 Location: New ZealandPosts: 7 |
You want to use the black rotor (from machines that used Al wire) with the 0.6mm copper stators (slightly older machine). The stator you want has de-cogged laminated poles. ie, the tops are rounded off. Testing, testing, ...1 ...2 ...3 |
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