Sharing ideas on how to make a more efficent motor using Flyback (MODERATED)

[MagnaProp]

...It makes for a weak field but the closer the better...

Still not sure how it works. When you switch the ceramic magnets, instead of closing the loop with the neo, the ceramic magnets over power the round neo to the point that more ceramic field exits the I instead of the neo field?

If I still have it wrong, then I'll leave it at that and thank you for posting the info. @gotluc- Thanks for the clarification.

[shylo]

There is no way the little chunks of ceramic (cut up speaker magnets) could over power that neo ,it is very strong.
I put one I-core on one side of the neo, lay the coil on, place the ceramics in the hole of the coil  , then put the other I on.
The ends of the I's each have their own pole a N  &  S, power the coil and the poles flip at the ends of the I's.
Without powering the coil , if you bring a magnet of the same pole close to the I, you can feel the repulsion , power the coil and the magnet gets sucked in.
Pretty simple to test,  I'm gonna try it without even using the ceramics' , maybe even placing more I's all around.
Hope that's clear enough.
artv   

[gotoluc]

The ideal way to get the strongest flux out of this design would be to use only neo magnets. However, to re-magnetize (flip the pole) of a neo magnet would require a very large amount of power.  So there would be no point to even try this.
Alnico magnets are a step down from neo's. So if you compare an equal size alnico to a neo, the alnico would be about half the strength of the neo. So this is part of what makes the alnico easier to re-magnetize compared to the neo.
Now if you compare equal size ceramic to a alnico, the ceramic would be about half the strength of the alnico.

So syhlo, I hope you understand that this is the reason you're not having much success with your test device, as you are using magnets of two different extremes. Not only that but the neo looks to be larger in size then the ceramic magnets.
You may want to consider using all ceramics and keep the size ratio the same. Or try 2 to 3 times the size (mass) of ceramic to size ratio of neo.

Luc

[verpies]

He's right:

The coercivity of AlNiCo magnets is much lower than NdFeB magnets.
Also, NdFe magnets have a higher remanent flux density than AlNiCo magnets and ceramic magnets.

However what is not commonly known, is that AlNiCo magnets have lower coercivity than ceramic magnets, despite having higher remanent flux density.

Last, but not least, AlNiCo magnets and NdFeB magnets both conduct electricity and that makes them suffer from Eddy current losses whenever flux changes.

[gotoluc]

Thanks verpies for posting the information.

This link http://www.duramag.com/alnico-magnets/available-alnico-magnet-grades/ was posted by a youtube member. It contains details on the different Grades of Alnico manufacturing process.

He also wrote:
"Just a note, it appears that Alnico magnets require a length to diameter ratios of at least 4:1. Apparently if they are shorter relative to diameter they don't function as well. I noticed that you cut down your magnets which may be affecting the performance.

I would like a second opinion on the above.

Also, if you can think of any other kind of material which could be re-magnetized easier then Alnico please let us know.

Luc