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axial flux design with magnets+electromagnets?
By canadianfred, Section Wind Posted on Tue Apr 12, 2005 at 05:02:41 PM MST
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From http://www.enercon.de:
"The magnetic field of the stator winding is excited via so-called pole shoes. These are located on the disk rotor, the moving part of the ENERCON ring generator."
If I'm understanding this correctly, they use a combination of magnets and electromagnets in their windmill, with the electromagnets being driven by the power generated by the magnets.
I'm wondering if anyone has looked into making a homemade-sized axial flux alternator that uses something like the above (a combination of magnets and electromagnets).
The magnets would be there to generate power for the electromagnets. The faster the wind, the more power would be produced from the electromagnet portion of the alternator, resulting in stronger electromagnets, resulting in more power produced by the alternator as a whole.

axial flux design with magnets+electromagnets? | 7 comments (7 topical)

Re: axial flux design with magnets+electromagnets? (3.00 / 0) (#1)
by Chiron on Tue Apr 12, 2005 at 01:13:07 PM MST

I don't see any sense to use a PM genny to excite the field when the turbine will only operate if grid power is present anyway.

That's a safety feature on all the utility size machines, at least that I know of, lose the grid they automaticaly shut down so I would think they'd use current from the grid to excite the stator.

I had considered using a small PM genny mounted to the same shaft to provide startup current to the rotor of an electricaly excited gen partly to save $ on those expensive Neos and avoiding the need to have a battery backup for the turbine when the winds were too low but seemed to be a case of looking for trouble and complicating a simple and inherently reliable design. Brushes wear out and I don't want any regular maintainance that doesn't involve a grease gun.
Chiron > > I was here

Re: axial flux design with magnets+electromagnets? (3.00 / 0) (#2)
by nanotech on Tue Apr 12, 2005 at 01:24:34 PM MST

Seems kind of redundant to me.

You're not going to get any extra energy from anywhere, so why not just take the power off the windings that are going past the magnets?

A good portion of any power made in these windings would be lost in the magnetic transfer to the second set of windings.

At least that's how I see it.......
__________________________________________
My ship finally came in, but it was the Kobayashi Maru!

Re: axial flux design with magnets+electromagnets? (3.00 / 0) (#3)
by electrondady1 on Tue Apr 12, 2005 at 05:01:59 PM MST

this had occured to me as well from an earlyer thread discusing auto alternators , the idea beins a mag conversion alt. or motor is used to create the 50 watts required to power up the rotor of a second alt. increased power to the second alt should form a increasingly powerfull magnetic field. i would think that greater power could expressed in the stator of the second alt. i think its worth a try.

Re: axial flux design with magnets+electromagnets? (3.00 / 0) (#4)
by Peter V on Wed Apr 13, 2005 at 12:02:06 PM MST

I've noticed that a loyt of folks on this board keep trying to come up with really complicated solutions to simple problems.

I've noticed over the years that when it comes to reliability, efficiency, cost, etc. the simplest designs are invariably the best.

The KISS principle really does work.
Einstein said it best, "As simple as possible, but no simpler."

Re: axial flux design with magnets+electromagnets? (3.00 / 0) (#5)
by TomW on Wed Apr 13, 2005 at 12:11:48 PM MST

Peter;

Or as some person who's name I have forgotten said:

Perfection is not achieved when nothing more can be added but when nothing more can be removed.

Cheers.

TomW

The Truth is the Truth, even if no one believes it; and a lie is a lie even if everyone believes it

[ Parent ]

Re: axial flux design with magnets+electromagnets? (3.00 / 0) (#6)
by electrondady1 on Wed Apr 13, 2005 at 10:06:59 PM MST

all i can say is there is more than one way to skin a cat . and without inovation there is stagnation. your saying its simple to form a d.r. pma with maybe 32 mags and 12 or 16 coils or a motor conversion with skewed multiple mags on a ground down armature but it too complex to hook the output up to an alternator to see what you get.

Re: axial flux design with magnets+electromagnets? (3.00 / 0) (#7)
by rotornuts on Wed Apr 13, 2005 at 11:20:39 PM MST

Perfection is when nothing more can be removed from what? I guess that depends now doesn't it!

[ Parent ]

axial flux design with magnets+electromagnets? | 7 comments (7 topical)

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