On Fri, Jan 15, 2010 at 1:18 PM, Stephen A. Lawrence <[email protected]> wrote: > I've been trying to get my head around the interactions of moving > magnets, toroidal magnets, and toroidal cores. As I understand it, we > have a situation like this: > > 1) Toroidal magnetic core has a non-toroidal field when current is off. > Another magnet will be attracted to the core.
I don't recall that we know anything about the core except it is present in demo 2 Orbo and absent in demo 2 Pulse Motor. I don't recall anyone saying the core was magnetic, only ferromagnetic. Of course, it could become magnetic due to remanence. Or it could be a high permeability metal with lots of nickel and little remanence, a super-mumetal. T
