The Steorn Permanent Magnet Motor Replication Project: It's FLUX time.

[Kent767]

allcanadian, can you try to do something similar to the design on page 8?  I dont have any magnets..

A cam would be hard to construct quickly, but perhaps using 2 gears instead... 1 gear isntead of a cam, and the actuator tied to the wheel of another gear perpindecular to the cam

[capeguy]

@vorlon

is there any consensus on what the shielding material is?? iron, mumetal, plastic??

could it be another permanent magnet as the shield

----------------------------------------------
some really powerful PMs on on this page...
pull force of 640 lbs with a weight of 17.34 oz...

http://www.kjmagnetics.com/proddetail.asp?prod=BZX0Y08


# Dimensions: 4" x 2" x 1/2" thick
# Material: NdFeB, Grade N42
# Plating/Coating: Ni-Cu-Ni (Nickel)
# Magnetization Direction: Thru Thickness
# Weight: 17.34 oz. (491.7 g)
# Pull Force: 640.50 lbs
# Surface Field: 5120 Gauss
# Brmax: 13,200 Gauss
# BHmax: 42 MGOe

[allcanadian]

My neo's have around 35 lbs pull each, attraction is felt at about 1 foot, repulsion the same.
All I can say is they are absolutely insane, you cannot pull 2 of them apart with your hands, big strong men have tried and none have done it. If they are loose and come together even an inch apart you will understand these are serious dangerous magnets. They are really cool you just have to be very careful. don't let children anywhere near them whatever you do.

[JackFrost]

cheap neo magnets and holding cups:

leevalley.com

Look under "hardware"...

Cups shunt the opposite pole and make the magnets stronger - see this:
http://www.leevalley.com/shopping/Instructions.aspx?p=54198

Can't use another magnet as a shield.

[Kent767]

I think its pretty well accepted that they are using a mu-metal shield or something similar.