F.B.D.I.S.S.M - Flux.Boosted.Dual.Induction.Split.Spiral.Motor.

[tsakou]

I received the heat threated Mumetal pieces yesterday and immediately tried them out in my test rig.
The higher permeability of Mumetal gave slightly higher solenoid face fields, perhaps 2-5% more flux.
But I'm sorry to report worse result (between 5-25% lesser) compared to ordinary Oriented Transformer Steel.
During the tests I noticed the magnet being less attracted to the Mumetal vs Oriented Steel.
The strength of a N45 neo is approx 1.33T and this might be the cause of the weaker results.
Mumetal saturates at 0.8T and Oriented Steel at 1.9T. This means I need to tryout another alloy at higher saturation level.

Permenorm can handle 1.55T (more than the neo) and have pretty good permeability at 120000.
The Mumetal had 250000 and Oriented steel have about 15000.
I'll get some pieces of Permenorm laser cut within a couple of days. (It's hard like spring steel)
If this material doesn't improve results I can just as well use ordinary cheap Oriented Steel.

Thank you very much for giving to us, all the details. I follow this thread, and it's like being there, next to you at the lab. All this information is useful, not only for your project, but for everyone that messes around with magnets and magnetic material. Keep on, the good work! 
Best wishes for success, with this project. And again, THANK YOU VERY MUCH for not being secret.


Kostas

[Gregory]

Honk,

Sorry to hear that mumetal did not worked as fine as you would like, but you tried and at least now you and every member know the results and the explanation.
Perhaps the next alloy...

Good work!

[Schpankme]

... The higher permeability of Mumetal gave slightly higher solenoid face fields ... sorry to report worse result ... compared to ordinary Oriented Transformer Steel.

Honk,

You may end up with a layered hybrid design, example:  mu metal flux density is about 4 times that of ferrite, about 3 to 4 times more ferrite can be used than mu metal.

- Schpankme

[Honk]

Yes, but I cannot fit a larger core than I intend to use.
Ferrite is out of question in this application.
And the magnetic attraction properties of ferrite is really bad compared to plain steel.

I have asked my supplier on Vacoflux48. It is a high saturation cobalt alloy.
It handles 2.35T at slightly better permeability than Oriented steel.
If they can provide sample on this material it might try it out.

[Gregory]

Just curiosity, but I wonder whether you worked with metallic glasses, and tested how they work as an electromagnet? Perhaps they are not as good in saturation, but very good in permeability, as I read.

Metglas and such...
http://metglas.com/products/page5_1_6.htm

Here is a page which compares the properties of some alloys:
http://www.technicome.com/SM_alliages_1crist-d.htm

And here is a Pdf about Vacoflux alloys:
http://www.vacuumschmelze.com/dynamic/docroot/medialib/documents/broschueren/htbrosch/Pht-004_e.pdf