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Airgap
By rpcancun, Section Mechanical Posted on Tue May 08, 2007 at 06:21:13 AM MST
.

I was wondering on airgap,.....if for example you have rotors 1/2 inch
thick, 2x2x.5 mags,...lets say 3/4 thick stator how do you determine
airgap?,....is that the distance between rotors or distance from stator
before contact?
I realize that the blades have a lot to do with it but i was curious
in a steady rpm say 200-300.
I have rewired my stator coils in parallel (3 coils each phase)
each phase came out to .4 ohms
(180 turns 16gauge each)
if all goes well i should have rotors built and ready for lathe testing
this week...wish me luck....
Thx

Airgap | 3 comments (3 topical)

Re: Airgap (3.00 / 0) (#1)
by Flux on Tue May 08, 2007 at 01:05:04 AM MST

Air gap is the distance between the faces of opposite magnets of the rotors.

Forget the stator, that doesn't enter in it.The distance between the magnets and the stator is a mechanical gap that is needed for the thing to work.

Yes good luck, look forward to test results.

Flux

Re: Airgap (3.00 / 0) (#2)
by CmeBREW on Tue May 08, 2007 at 06:39:30 PM MST

Rpcancun,
Yes, hope it works out well for you. Are you going to epoxy or super-glue the magnets down to the rotors? Do you have a template for those big magnets? One giant thing I just learned is the magnets slide all over the place if you put them down with (on) epoxy. I thought they would go staight down and stay. I didn't have a template--and so I nearly ruined my first rotor and nearly went frantic and insane for about an hour. (And i only had little magnets) I know I will never try that again without a plywood template. My finger tips hurt for days! I'm sure you know what your doing with dangerous mags like that.

Re: Airgap (3.00 / 0) (#3)
by Lumberjack on Tue May 08, 2007 at 06:48:58 PM MST

The closer the rotor is to the coils the stronger the magnetic flux is and the more power you will generate. Halving the air gap between the rotors increases the flux strength by 8 times if I recall correctly. You want just enough gap for the faces to clear each other under power. If you get to much drag then go back afterwards and add to the gap.

Airgap | 3 comments (3 topical)

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