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

[Honk]

Another report.

I received the Metglas alloy 2605SA1 but I was disappointed to see how thin is acctually is.
It is 0.0009" and to form it into the electromagnet shape I would like to test, was impossible.
I performed some more research and I found another alloy called PERMAX M.
The permeability is 110000 and it handles 1.5T saturation. I have asked for samples on this alloy.
It can be delivered in 0.2mm thick laminates.

Meanwhile I found out that every harddisk contains 2 plates of Mu-Metal alloy.
This alloy have high permeability at approx 150000 and handles 0.8T.
I managed to collect the old HDD:s at my work. During this week I will salvage all of the Mu-Metal
plates and then mill them into the shape I desire. Hopefully there will plenty of Mu-Metal.

I need to build a test rig to see what power levels I will have to feed to the electromagnets during the attraction/repel pulse.
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Update:
I have now salvaged a lot of the assumed Mu-Metal.
There seem to be two types. One that has yellowish color, and another ordinary silverish type.
Are both of these types Mu-Metal? Or is one of them some other type of alloy, or perhaps just plain iron?
I ask you guys here. Some of you might know the answer!

[Dr. Tesla]

Honk,

Some months ago I saw that material in my friend's workshop. To my recollection it was grey-silver in appearance. The yellow one could be just brass or zinc-plated steel. If no one posts a definite answer, you'll probably have to test both of them...

[Honk]

I just bought these mu-metal boxes from ebay.
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=190177879791&ssPageName=ADME:X:AAQ:US:1123
When they arrive I will cut and mill them into an electromagnet core.

I need to perform the important electromagnet test to measure the required power level to match a solenoid to the flux levels of a ndfeb magnet.
Just to be on the safe side I have decided to use N24SH magnets in the Stator and N50 or N52 in the Rotor.
The N24 flux level is approx 1.05T and the N52 is 1.45T.
By weakening the Stator and increasing the Rotor strength it will be a lot easier to make the solenoid electromagnet match the N24 Stator magnets.

I have also three other types of high permeability alloys coming in as samples.
One of the types is very interesting, as it is capable of both strong flux levels and high permeability. A rare combination.

[Honk]

I better give you all an update on how the motor design is proceeding.

Early next week I will receive both Mumetal and Permenorm 5000 H2 in letter sized shets. They were out of type S4.
Mumetal at 1mm thickness and Permenorm at 2mm thickness.
I have found out that the material will need final heat annealing after being cut to obtain the full permeability.
I will laser cut the alloy into the desired test shapes and then the deliver company will heat anneal the parts for free.

When the Solenoid vs Ndfeb strength test result is ready I will know if my design needs some last minute changes.
I guess this will happen mid january. Shortly after that I'll order the magnets.

[acp]

I'm very interested in this design Honk, Thanks for the update.