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air core / air gap definition | 15 comments (15 topical, editorial)

Re: air core / air gap definition (3.00 / 0) (#12)
by TheCasualTraveler (a.miklos@yahoo.com) on Tue Jul 15th, 2008 at 09:45:10 AM MST
(User Info) http://thecasualtraveler.com/wind.htm

""Perhaps someone should decide on new names for these various forms of construction that is unambiguous and foolproof then the confusion will not arise.""

I would like to suggest this be added to the FAQ's / Glossary and if someone can reword it better than please do as I don't think I'm most qualified for this.

Air gap - In dual rotor, axial flux alternators with two magnet rotors this is the distance from magnet face on one rotor to the magnet face on the second rotor, or where a second blank rotor is used then it is from the magnet face of one rotor to the second blank rotor. This is the area where the stator is suspended. In radial type, or single rotor iron core alternators, this is the distance from magnet face to the coils/laminations in the armature or stator. In single rotor, air core alternators this could also be used to describe the physical clearance between magnet face and stator / coils.

Core - The area inside the coils. The substrate the coils are wound around.

Air core - An alternator having no iron in the stator/armature circuit.

Iron core - An alternator with iron or iron laminations around which the coils are wound (so as to complete/direct the flux circuit ?)

FWIW
Andy
[ Parent ]

Re: air core / air gap definition (3.00 / 0) (#13)
by Flux on Tue Jul 15th, 2008 at 12:39:45 PM MST
(User Info)

That all seems pretty reasonable.

I really don't know what you do about this single rotor thing, that is always going to be a problem. The true air gap is the length of flux path from one magnet to the next. The longest route is via infinity and the shortest is the minimum distance between magnets. Most of it lies somewhere between these limits. Restricting the discussion to the gap between rotor and stator is not going to be very helpful.

It really is not a very good form of construction but it does fill a need to use bigger standard magnets in a simple configuration where convenience is more important than cost effectiveness or efficiency. Within reasonable design limits the air gap can probably be considered as being close to the stator thickness, but with thicker or thinner stators this again could be way off.

Some things don't seem to have easy answers.

Flux

[ Parent ]

Re: air core / air gap definition (3.00 / 0) (#14)
by TheCasualTraveler (a.miklos@yahoo.com) on Tue Jul 15th, 2008 at 07:45:55 PM MST
(User Info) http://thecasualtraveler.com/wind.htm

Perhaps, more to the point would be to refer to single rotor, air core alternators as "infinite gap" setups and the space referred to as "stator clearance"

well, maybe...

Andy
[ Parent ]

Re: air core / air gap definition (3.00 / 0) (#15)
by Flux on Wed Jul 16th, 2008 at 01:43:35 AM MST
(User Info)

I do like the term stator clearance. Many think this is the air gap in a dual rotor. That term would remove this confusion.

Flux

[ Parent ]

air core / air gap definition | 15 comments (15 topical, 0 editorial)

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