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Old 08-22-2007, 12:39 PM
nali2001 nali2001 is offline
Join Date: Apr 2007
Posts: 82
Air gaps

Well Sykavy,
small air gaps are indeed much desired. But if you go too crazy with them they can in my opinion become problematic. When you want to get in the range of like 0.02mm you really stet the bat pretty high for yourself. Everything must be machined with top notch precision, and also you must start to think about what the eventual bearing wear will be doing, also metal expansion due to to heating will become considerable. Stator vibration and stretching will also now be an issue.

Now there is another way to combat the need for insane small air gaps. And that is to increase the 'contact' or 'pole' surface. The longer the total pole the more interaction surface you have.

Just look at this render and see the small pole surface:
Infolytica Gallery TEAM problem 24 - Nonlinear Time-Transient Rotational Test Rig

Now compare that with the stator of a real use reluctance motor:

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