Just trying to find a ferrite material that would work in an axial flux motor.
Considering M20 as a material for prototypes.
Some of the values are
Note clipped from website--------
initial Permeability µi 10 kHz; <1 gauss 2000 ± 20%
Saturation Flux Density gauss BS 10 oersted ≈ 4700
Residual Flux Density gauss Br ≈ 1500
Coercive Force oersted HC ≈ 0.2 Loss Factor 10-6
Tanδ/µi 0.1 MHz; 1 gauss ≤ 15
Temperature Coefficient of
Initial Permeability (20-70°C) %/°C ≈ 1.0 Power Loss Density mW/cc Pv 25 kHz; 2000 gauss; 25oC 25 kHz; 2000 gauss; 100oC ≤165 ≤100 Volume Resistivity Ω cm ρ ≈ 102 Curie Temperature °C TC ≥ 210
Note END clip----------

So I understand a lot of this but I am not an engineer.
The magnets are approximately .35 to .45 apart. they would be something like .060 away from the ferrite.
So... am I leaning in the right direction?
I know silicon steel is an option but each slice would be so narrow cutting it would be next to impossible.

The ultimate question is having two n52 smallish magnets .45 apart benefit from N20 material or would just leaving it air core be better.

 

I’ve never seen ferrite used in a motor operating at mains frequency, usually seen as the core material of transformers in switch mode power supplies operating at >10kHz.
The clue is in spec permeability figure quoted for 10kHz.

More normal is the use of steel laminations for the motor stator operating at 50/60Hz.