[mildchalupa]

1.5-2 Tesla you hit the knee of the BH curve and you saturate the steel.

[eternityforest]

Do you need steel? What about a brushed(Assume some fancy future micrometer gallium filled gap that doesn't wear or something) motor that just has superconducting coils attracting each other?

[TaylorAlexander]

Yeah I guess if you have superconductors you prob don’t need steel. Bonus, no cogging.