MU metal stator? I cant find any 60mm stators to buy

[Hummina Shadeeba]

It's almost impossible to find larger out runner stators! Alibaba is my only source so far with gobrushless.com out of stock but it's a lot of trouble getting them made in china.
I'm thinking of making them.
Is it as simple as cutting electrical steel sheeting, or MU metal, throwing them in an oven at an unknown temp, and epoxying them together? MU metal sounds easier to cut and has greater permability. Will epoxy be a good enough dialectric?

 

[hydro-one]

it is special high resistance silicon steel with dielectric coating on each side. read farfles giant outrunner build, he ordered it stateside. here http://endless-sphere.com/forums/viewtopic.php?f=30&t=41576&start=75

 

[Hummina Shadeeba]

I found I can get sheets or rolls of MU metal super thin and maybe I could just cut out some layers instead of paying for the cut layers. I didn't see how farfle glued the sheets together himself and guess he must have.

Epoxy would work as a good dialectic I think?
But I don't know if any of this is possible and am waiting till Monday to quiz the seller.

The MU metal has greater permability and if I could cut it to shape and glue the sheets together I'm now into the idea more than even if I could find a stator the size I want.

 

[Honk]

High permeability is good but not the holy grail for motors.
If you want high performance you need a material with the lowest possible hysteresis and eddy current losses.
Powder core technology is prefered for the best performing motors.
Besides that you need strong magnets and heavy duty low resistance winding.

Btw, in order to get high permeability from Mumetal it must be heat annealed at a precise temperature
and slowly cooled down. Unless that threatment you can just as well use regular iron laminates.

 

[major]

Mu metal has a low saturation flux density; less than half of normal electrical grade lamination steels. Therefore, you would need about twice as large of a stator using Mu metal. Also I think its structural properties are poor so you might have difficulty holding correct geometry and tolerances.

 

[Hummina Shadeeba]

ok forget that then. maybe MU metal powder core even? What is the best core for a three phase bldc motor?

 

[MrDude_1]

Powder core technology is prefered for the best performing motors.

where can I find more info on that? Ive never heard of it, but I can instantly see how some kind of sintered powder core could be ideal..