I'm struggling to understand why a homopolar motor still operates when the field magnet is corotating with the current carrier as shown in the first image (the blue and red representing poles on a nickel coated magnet which acts as the current carrier), but not in others such as my design in the second.
This second image is a representation of a motor design I attempted but the prototype did not develop any rotation (the prototype had several hundred wire turns and carried 4 amps, the field magnets were a stack of N42 neo magnets with a 20mm square face).
Edit -> The current carrying loop and rectangular magnet are both meant to co-rotate in unison at the axis
Since the Lorentz force happens even when the magnetic field rotates with the conductor for the first design in my mind this should be equivalent for the second.
Where is the flaw in my design - or is this a case of experimental error?