My best at homopolar design

[angryScientist]

Here is an idea I came up with a couple decades ago. Just been kickn' round my head for a while.
It looks better in my head but here's the gist.

[angryScientist]

As you can see the magnetic flux goes through the end plates in different directions. The connections between the two end plates is made at the periphery through segments which prevents current from flowing in any direction but between the two plates to reduce loss.

The main benefit, and my entire reasoning behind this idea, is the brushes used for removing the power are placed on the ends of the shaft there by reducing the ware and complexity of the brushes. So one end of the shaft will be positive and the other end negative.

[angryScientist]

Four separate magnets in the shape of a section of a toroid. Could be a loop of pipe with section cut out then filled with wire.

[Creativity]

yhm maybe it will help if u draw the forces, because i don't see it working as u say. Or draw a path of the current, thx!

[angryScientist]

Maybe this will help.