Electric motors and generators are constructed from materials that do one of three tasks: generate magnetic flux, conduct magnetic flux, or interact electrically with magnetic flux to provide torque. Power density of electric machines is increased by maximizing the amount of the first and last materials, while minimizing the amount the materials utilized for conducting the magnetic flux. Revolution’s motors and generators achieve superior power density compared to other electric machines by the lack of a ferromagnetic stator, which is used merely for magnetic flux conduction.