Permanent magnet assisted motor coil designs

[seychelles]

THE STEEL RING IS NOT THICK ENOUGH TO ABSORB THE PM FLUX. THERE SHOULD
BARE MINIMAL ATTRACTION WHEN A PIECE OF IRON IS NEAR THESE COILS. SOOORY
JUST A DISTANCE OBSERVATION. USE 1 MM FLAT STEEL SHEET TO ROLL YOUR MAGNET
IN.

[captainpecan]

THE STEEL RING IS NOT THICK ENOUGH TO ABSORB THE PM FLUX. THERE SHOULD
BARE MINIMAL ATTRACTION WHEN A PIECE OF IRON IS NEAR THESE COILS. SOOORY
JUST A DISTANCE OBSERVATION. USE 1 MM FLAT STEEL SHEET TO ROLL YOUR MAGNET
IN.

I would normally agree with that assessment 100%. However, I tried that first. I tested a few sizes. And I found it to be a bit different. I posted all the numbers and stuff earlier in the thread, but I feel I need to repeat my findings again now that I have more of a build and it's not just theory anymore. I'll dig up my stuff and show you why I chose what I did.

[captainpecan]

THE STEEL RING IS NOT THICK ENOUGH TO ABSORB THE PM FLUX. THERE SHOULD
BARE MINIMAL ATTRACTION WHEN A PIECE OF IRON IS NEAR THESE COILS. SOOORY
JUST A DISTANCE OBSERVATION. USE 1 MM FLAT STEEL SHEET TO ROLL YOUR MAGNET
IN.

Okay, here is a little quick recap of how I chose the core. I am by far not saying you are wrong, I am just showing my thought process to move forward with the ones I have chosen. I started with a thicker core and changed with what I was seeing. There is a tiny bit of flux leaking out as you stated, but even at the top where the field is the strongest, it is small enough that metal moving by it at over 1mm distance is not effected by it at all. I made an attraction only version with no PM on the rotors for testing, just steel, non powered up, the rotor would spin for a very long time and would not stop aligned with the core any greater than random. So I think it is hiding the field enough to be able to see the results I am looking for through further testing. Or at least show the benefits this design can give, or take away. At least it is good enough results to warrant further testing. It seemed to me that the core needed to be closer to saturation  or beyond in order to begin releasing the inner flux as early as possible. That's the theory anyway.

[captainpecan]

And here are all 6. Ready to finish mounting them and put things back together. Everything is still being built with the assumption that I will still be tearing it down and reusing parts for another build if I evolve more on this one. If I get a design I'm happy with, I will resin the coils. But still need them removable for now. Hopefully next couple days I can thump the dust off the old scope and start seeing what this wave form looks like!

[seychelles]

THANKS FOR YOUR MASSIVE EFFORT AND AWESOME DATA. YOU WILL SUCCEED AT THIS VENTURE.
KEEP KEEPING ON.