A homopolar motor is a direct current electric motor with two magnetic poles, the conductors of which always cut unidirectional lines of magnetic flux by rotating a conductor around a fixed axis that is parallel to the magnetic field. The resulting EMF (Electromotive Force) being continuous in one direction, the homopolar motor needs no commutator but still requires slip rings. The name homopolar indicates that the electrical polarity of the conductor and the magnetic field poles do not change (i.e., that it does not require commutation). Wikipedia, Homopolar Motor
The Dynaspheres are homopolar as is Russell's Optic Dynamo-Generator.
See Also
Dynasphere
Optic Dynamo-Generator - Pages 1-5
Optic Dynamo-Generator - Pages 41-46
Optic Dynamo-Generator - Pages 47-50
Original Opti Dynamo-Generator Document
Polar Interchange - Device Design
Polar Interchange - Part I
Polar Interchange - Table of Contents
Russells Optic Dynamo-Generator