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Forum Index : Windmills : Disarster
| Author | Message | ||||
| brucedownunder2 Guru  Joined: 14/09/2005 Location: AustraliaPosts: 1548 |
Well,, I finished the new neo Magnet rotor conversion ,,looked perfect ,,nice and smooth inside ,painted, a real joy !!. Was fitting it on the splined shaft for the final testing , bang!!! it fell off and started rolling down the paddock. I couldn't chase it ,,too steep . I just watched as it rolled down into the bush,maybe a couple hundred mtrs. Ilda and I spent the next hour looking for it ,,all we found was grass . I was so abusive she had to leave me there in the jungle ,all the wildlife had way gone by this time . Anyhow ,,I've had a sleep and will go back this morning for the second big search-- Wish me luck.. Down and nearly out Bruce Bushboy |
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vawtman Senior Member  Joined: 14/09/2006 Location: United StatesPosts: 146 |
Hey Bruce you were watching the girls peddle by on their bikes again were'nt Ya. 
Just kidding and hope things turn out good.Just be carefull. Mark |
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| dwyer Guru Joined: 19/09/2005 Location: AustraliaPosts: 574 |
hi Bruce Bloody hell  l do hope that you will find it this morning and Just watchout for nasty brown snake  before you start put on your gumboot and have a stick swinging around on the long glass while you are looking your hubs
Hoping that is no damage to Hub  |
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oztules Guru Joined: 26/07/2007 Location: AustraliaPosts: 1686 |
A Copperhead and a Tiger snake yesterday..... so gumboots and shovel will be handy fossicking implements.... and maybe a compass and cut lunch. I hope your output improves with the new magnets, but I fear that the iron was saturated with the ferrite mags, and although more power should result from the higher saturation you will now have, I wonder if the shaft input power will be gobbled up in the new stronger iron losses. I await your results with much interest. If the performance improves dramatically, then perhaps there is hope for the Seeley stator. At least with the Seeley, the air gap is larger and so saturation is less likely, and drag will be less for the same magnet strength improvement. .........oztules Village idiot...or... just another hack out of his depth |
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| brucedownunder2 Guru Joined: 14/09/2005 Location: AustraliaPosts: 1548 |
Thanks Crew.. I found it this morning under a log,being painted green ,yesterday afternoon was a bit difficult. It's f-u-c-kay'ed with 32 magnets broken out of it and 3 radial cracks to the housing .. Must have hit every goddammed rock and tree on it journey--we live in pretty wild country up here. Anyhow ,,Gordon phoned me and came up with an alternative suggestion --go back to ceramics and a stock standard 80 series /dual in parallel. So ,I'll try that .Lucky I have plenty of these F&P stators/rotors here. On a sad note,Dennis lost his wife to a long illness last week . On behalf of "thebackshed" , I'd like to send our condolence's to this nice guy .. Bruce -snake chaser and smasher upper of good things extrordinaire Bushboy |
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| oztules Guru Joined: 26/07/2007 Location: AustraliaPosts: 1686 |
I don't know, a few surface scratches, and some bruised paint and you've given up. 
Since you Queenslanders got a girl running the shop, you've gone soft on us...... Sorry to hear that Bruce, It is a shame you didn't get to try it out for real. When you lose 30 odd mags before you get it in the air, I'm guessing the results are skewed towards failure. Very sorry to hear about Dennis's loss, and he certainly has my condolences. .....oztules Village idiot...or... just another hack out of his depth |
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Gizmo Admin Group  Joined: 05/06/2004 Location: AustraliaPosts: 5116 |
Hi Bruce. Have you tried draging a lump of steel through the grass to see if it picks up some of those missing magnets? Sorry to hear about Dennis's loss, I know his wife has been ill for some time. It would be a great sadness to loose a life partner. Glenn The best time to plant a tree was twenty years ago, the second best time is right now. JAQ |
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| Jarbar Senior Member Joined: 03/02/2008 Location: AustraliaPosts: 225 |
Hello Bruce, I have not had such a laugh at someone else's expense for a long time.Did you film it?.So near and yet so far,Keystone Cops all over again.Is Mt Tamborine on BHP's list of Iron ore sites,the attraction seems irresistable.I'm just peeved it didn't make to my doorstep intact. Anthony "Creativity is detirmined by the way you hold your tounge".My Father "Your generation will have to correct the problems made by mine".My Grandfather. |
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Highlander Senior Member Joined: 03/10/2006 Location: AustraliaPosts: 266 |
That's terrible for Dennis. My thoughts are with you mate. Bruce sorry to hear about the rotor, lucky you have the support from kind people like Jarbar. Central Victorian highlands |
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| domwild Guru Joined: 16/12/2005 Location: AustraliaPosts: 873 |
Sorry to hear about Bruce's and Dennis' loss. Not iron ore site at Mt Tambourine, rare earth mineral site! Taxation as a means of achieving prosperity is like a man standing inside a bucket trying to lift himself up. Winston Churchill |
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| brucedownunder2 Guru Joined: 14/09/2005 Location: AustraliaPosts: 1548 |
Thanks for the kind thoughts -I'll get over it..  Bushboy |
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Tinker Guru Joined: 07/11/2007 Location: AustraliaPosts: 1904 |
Looking at your picture I have a question: I was diddling with two identical neo magnets to see how they behave when placed next to each other. They did NOT want to sit next to each other on a bit of steel. One magnet always moved to maintain about 5mm between them. So, how did you manage to place your magnets so close to each other? It must have been a real nightmare to space them on your rotor blank. Also, did you check that each magnet has an adequate return path for its flux from the magnet face > aligned pole face > nearby pole face(s) > next magnet > ferrous rotor ring? I think you have too many magnets there but may be wrong. The way I read it one magnet should be distanced from the next so that when the first aligns with a pole face the next should be no closer than halfway past an adjacent pole face. That way the return flux is shared by the adjacent pole faces and attracted by their corresponding opposite polarity magnets. Tinker Klaus |
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| brucedownunder2 Guru Joined: 14/09/2005 Location: AustraliaPosts: 1548 |
Tinker,, Obviously you haven't built one of these,with respect to your comments.. I have built three ,2 for the original stators and 1 for the new style stator ,,which failed. That was because of the size of the magnets ,,too narrow to cover the pole piece,,wider magnets would have been fine .. What intrigues me is your statement that "you can't get the magnets close to each other" Ahhh,,there are 224 magnets on that conversion,every one of them is firmly and correctly placed--I don't know what you are doing !!. Anyhow,,we move forward,,Bruce Bushboy |
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GWatPE Senior Member Joined: 01/09/2006 Location: AustraliaPosts: 2127 |
Hi Bruce. I am with you. I can only think that tinker is commenting on the magnets behavior between the 2 rows. These are aligned alike, in pairs, that alternate around the rotor. cheers, Gordon. become more energy aware |
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| KiwiJohn Guru Joined: 01/12/2005 Location: New ZealandPosts: 691 |
Deleted by me, some rethinking is required! |
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| Tinker Guru Joined: 07/11/2007 Location: AustraliaPosts: 1904 |
Gordon, its the 2 alike aligned magnet pair IN a row. I am toying with building a PM magnet rotor. I have 24 identical round neo magnets. Trying to figure out magnet spacings I find I cannot place two next to each other. This way: Both magnets placed a piece of iron, both magnets have the same pole face up - they will not allow placing (without constraint) so that the magnets sides (ends) touch each other as in the picture above. One will always move away about 5mm as soon as the fingers pushing them together are removed. To use my magnets the way I want to (2 magnets as pairs to get the slanted effect) I will have to make some elaborate magnet spacing device. Tinker Klaus |
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| brucedownunder2 Guru Joined: 14/09/2005 Location: AustraliaPosts: 1548 |
Hi Tinker ,, I think you will have to make a drilled out aluminium former to "cage" your magnets --Zubbly has shown how to do this ,,and dinges (peter from Holland) .. Mine are long rectangular ,,so they have definate poles . ,,recovered all of them and will clean them for another go ,soon. Bruce Bushboy |
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| Tinker Guru Joined: 07/11/2007 Location: AustraliaPosts: 1904 |
Thanks Bruce. I am presently fitting the dividing head to the lathe so I can accurately drill the spacing former. Its a slice of a PVC pipe end cap which happens to be just the right diameter. Making an Alu cage is too much work
Well done finding all your lost magnets, did you use a metal detector? BTW, all magnets have 'definite' poles, even round ones. What I suspect is the round footprint of my magnets provides less stiction than your rectangular magnets so the like poles of the magnets repel each other even though most of their flux lines are parallel to each other Tinker Klaus |
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