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Old 08-23-2007, 01:43 AM
sykavy sykavy is offline
Senior Member
Join Date: Apr 2007
Posts: 184
Originally Posted by nali2001 View Post
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:

Would the solenoid piston set up used by teal be an easier feat?

He had two coils in his drawings and I was thinking that maybe he had a set up like a steam engine piston. A coil that drew the piston up and then a coil to pull the same piston down in the same solenoid ( maybe that is why they were so long). By having a constant magnetic circle around the piston then friction would be low, because it would have equal pull on all sides keeping the piston from scraping the sides during the relax time.
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