Requirement for Laminates..??

[steak2k1]

newb question.

I have seen in the pages on this site and often read references to the use of laminates in behind the stator for increased flux or inc. mag field strength. (hope I have the terminology right).

I was considering that instead of using laminates, if one could simply use a steel ring of appropriate thickness/diam behind the stator.  

If that is possible, what would the relationship be between the ID/OD of the individual coils as well as ID/OD of coil ring to the width of the ring (if that is actually a consideration).

EG: If my coils were 2.5" OD and arranged on 8" diam stator, then I'm thinking of using a ring 8" OD and with an ID of 3". Possibly from 1/8 - 3/16" T

It would seem to me on the surface that using a steel ring would/might be easier than finding/insulating/bending/installing laminate material.?  

However I do note that the laminates are at a 90 deg to the stator, and a plate would be parallel..is there something there I am missing. If that is the case could one not space the plate back a bit from the stator to achieve the same effect.

Thanx a lot..

stk

[kitno455]

no. dont do it. if you space it away, it defeats the purpose of the laminates, which is to provide a path for the flux from one mag to the next.

if you do keep metal there, then you have to worry about 'eddy currents'. google man.

allan

[techwolf]

Yes you can do it this way, but you must build it so that the backing plate/ring rotates with the magnet plate.

Else, if the backing plate is fixed the magnetic field will just drag through the steel and make heat.

Please someone correct me if I'm wrong....

[kitno455]

you are correct, the coils stay fixed, and the mags and the steel plate behind the coils must spin together. but then you have two air gaps, so you might as well put a second set of mags on that other plate, and make even more power!

allan

[steak2k1]

Gentleman..I thank you.  I guess like most newbs..(and I should know better), shoulda read a bit more before posting.  I found an excellent FAQ on coils that has a link to - "Low RPM Disk Alterantor".  Within that discussion/page, there is an excellent description of what function the laminates perform..among many other things as well...!

hopefully my plan to build a small mill will slowly proceed.

It is the arranging of the coils that I am now looking to understand as well as how the heck a furling system works...that one has got me stumped...but with any luck will find a decipherable diagram/pic of some sort or I'll see it in Hughs books, when they finally arrive.  

I will be working with 12 Neo's 1 X 3/8" rnd and AWG 18 wire. Not really sure if I will go wood AX avenue or auto rotor/hub.  I have a cpl of 3/4" pillow blocks w/bearings but feel that they are only good for 2 dimensional stress.  Tapered bearings would be better...  

In the meantime I shall read read read...

Great info and a big help.!

rgds..eh,

stk