Now because I am going for 3 phase I see little space to separate coils as to allow for powder to come in between.
No powder or other core should be between coils. It goes through center of coils, so magnetic field is concentrated through middle of loop.
can one think of any visual way of presenting this 'shorting out of field' s s thing?
Observe the slots in attached picture. If slots weren't present, e.g. if you welded them up, they would short out field. That is, they form a complete loop through middle of each coil and around the outside. That would work fine for a transformer (except for eddy currents if electrically conductive) with two coils having one magnetic core loop around them. But an external field (from moving magnet) would be picked up by the core and conducted tangentially to the coil, little through it. With a gap, magnetic field lines hit the core and find easiest path through middle of coil.
i'll be investigating regarding this. thank you
diysolarforum.com
Keeper (mostly) shorts magnetic circuit, significantly reducing field strength in air:
I propose
@Porch or
@Hedges to start out.
Testing? All I've got that's relevant is meters to measure volts, amps. Don't even have a Tesla meter at home.
Mostly your project is about mechanical mounting and rotation to stimulate it. If you ever do achieve the higher power you're shooting for, at low RPM that is high mechanical force trying to deflect parts.
Repulsion could find a stable midpoint. Attraction would have positive feedback, grab whatever it could. But one magnet disk with pole pieces on either side would see attraction; only multiple magnets see repulsion. Coils with no pole piece experience no force when stationary; I haven't figured out direction of force (except rotational) in operation.
ugg. I have never thought about how customs would feel about having high powered magnets in boxes just floating thru.
Maybe not customs, but airline.
I've read powerful magnets are shipped unmagnetized, then are magnetized at destination.
Of course small magnets we get for tinkering are already magnetized.
And a "keeper" shorting poles of magnet would reduce external fields. Enclosing in a Mu-metal box would further reduce.