Using a shield to assist swap of polarity in a magnet

[Low-Q]

that last pic will come to rest with the first ,~2 mags near polarity switch...........shylo........Vidar I like the idea of a shield...the only problem I have is the shield being saturated ? what type of material could this be made from.....shylo

The shield might be made double layered so the magnetic field doesn't "see" each other. Stauration might be a problem, but then I add more shield or use weaker magnets.

EDIT: Saturation in this design shouldn't be a problem. The shield can be saturated untill a sertain point, but more saturation than that would finally make the shields "transparent" and it wouldn't work at all.

Vidar

[shylo]

using the shield creates drag,...making it thicker or heavier will bring it to a stop ,..as will weaker magnets.........."double layered".....this prevents poles from seeing each other??...........shylo

[Low-Q]

using the shield creates drag,...making it thicker or heavier will bring it to a stop ,..as will weaker magnets.........."double layered".....this prevents poles from seeing each other??...........shylo

Drag? Eddy currents? Use ferromagnetic material that isn't conductive.
Example of fields between stators and rotor which doesnt see eachother below.

[shylo]

I could be wrong but I have'nt found anything yet that will block magnetic attraction.........is there such a process??....shylo

[mscoffman]

Low-Q,

If you do decide to build this keep us informed. Here is the thing; Let say you
have a curved groove or track inside the shield that rotates through 180 degrees
to flip the magnets. You are going to need to accelerate the rotational momentum
of each magnet segment and the faster you rotate the magnet the more cam force
is going to be required. So it makes sense to rotate slowly throughout the entire
length of the shield, as well as have the shield be as long as possible consistent
with operation. That momentum energy is going to wasted to some extent as friction.
The motor is going to have flipping friction going on almost continuously on a bunch
of segments at once, when it is running - that it what I would worry about.

:S:MarkSCoffman