| T O P I C R E V I E W |
| windymiller |
Posted - 10/05/2008 : 07:36:58
Spotted this project while googling
Could ideally used for vawt /multi blade slow (200 rpm)turning wind turbines.
Could be made even better using more coils of wire and more magnets
Simplicity in its self i think !!!!
No cogging issues which will please the vawt enthusiasts.....well worth a look.
http://www.otherpower.com/pmg2.html
Cheers WM
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| 8 L A T E S T R E P L I E S (Newest First) |
| vawtman |
Posted - 10/05/2008 : 17:10:41
Hi Wm
It's not has easy has it appears to be.
But FUN :v) |
| windymiller |
Posted - 10/05/2008 : 13:49:43
Hi fungus.......i hear what your saying and yes i do agree with some points you,ve raised but not all of them .
Id imagine fully enclosed coils and rotors in three phase motors would get hotter more quickly when under load rather than the design we,re discussing,
Yes i agree you would have a poor flux path if no magnetic material surrounds the coils.
The magnets dont have to be shoulder to shoulder in order for the generator to work......you can choose whatever diameter rotor you want permitting spacing between your chosen number of magnets.
Having magnetic conducting iron around the coils also create iron losses ,which is somthing you dont want.
I think if a good thickness of magnet is chosen ,flux around the coils should ,nt be too bad, so long as the air gap is minimal.
Just seemed a good project for the guy in the garage who loves tinkering.
Seemed like a pefect solution for vawt builders...
Cheers WM
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| fungus |
Posted - 10/05/2008 : 13:27:29
Also see .. http://www.otherpower.com/woodax.html |
| fungus |
Posted - 10/05/2008 : 13:19:54
One problem with this sort of generator is that it is an aircore single rotor generator and the flux does not link very well between the coils and the magnets, especially considering the magnets are pretty much touching each other. Good bearings can last for a long time if sized properly and there shouldnt really be any problems with them. The thing with a good motor is that it's probably already sealed, has good cooling, has a very optimized flux path in the coils through the laminations, has bearings, end plates, rotor .. all you have to do is turn down the rotor and add magnets, thats it. |
| windymiller |
Posted - 10/05/2008 : 12:42:54
Hi ben...yep agreed....to a point
I know someone with a three phase motor which had re occuring bearing problems ( through no fault of theirs )
With this set up you can choose what ever bearing you want....why compromise when you can custom build your own
Anyway its just an idea....thought it might appeal to those who wish to build their own.
Cheers WM |
| gotwind |
Posted - 10/05/2008 : 11:25:11
It might be easier to convert a 3 phase induction motor - better bearings.
http://www.otherpower.com/otherpower_experiments_motor_convert.html
Ben. |
| windymiller |
Posted - 10/05/2008 : 08:40:31
Yep i agree....probably distort as well.
I think overall the concept is really good...
If i was to make it id possibly go for a full fibreglass construction with a plasic/alloy wheel to act as the rotor to mount the magnets.
Im sure the construction material will not be limited to only plywood.
If people get frustrated by the lack of motors available for their project....they could always build something similar, without too much trouble.
Necessity is the mother of invention.
Cheers WM
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| sacongo |
Posted - 10/05/2008 : 08:16:55
I like it but the plywood wouldnt last without the "generously coated with fiberglass resin" it doesnt like the elements. |
