A Revised "Suggested Homopolar Motor"
A Suggested Homopolar Motor
Minimizing Conduction Electron Heat Losses at the Peripheries of Spinning Disc-shaped Magnets
Fig. 1 depicts a revised version of Fig. 3 in the first reference (or an expanded version of Fig. 1 in the second reference). There is only one battery (at rest). Not shown is a mechanical linkage between the spinning magnets and a mechanical load. The discs are metal-clad neodymium magnets.
Revised Homopolar Motor
Current enters the upper shaft via the upper brush. Since the shaft diameter is small, only slight amounts of energy per revolution are lost to friction. The current enters the center of each of the upper magnets and travels radially outward toward the rims. This produces torques in the positive x-direction.
Current exits each upper magnet and enters at the rim of each lower magnet. It moves inward toward the center of each lower magnet, creating torques in the negative x-direction. Since the upper and lower magnets counter-rotate, the net result is usable mechanical power.