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A motor that uses an electric field interaction with surface charges induced on the surface of a lossy dielectric rotor as the force mechanism is described. A theory of force generation and efficiency for a transverse-magnetic wave interaction with a moving conducting medium and a space-harmonic analysis of a practical circuit to carry such a wave are pmsonted. A comparison is made between the results of this analysis and test results on a three-phase 60-Hz motor using a Bakelite or a P1exigl.r rotor. Satisfactory agrwmont betwwn theory and experiment is obtained in most r.rp.ar. Motor operation was obsorvod in both diroctions of rotation, as arwult of interaction with the first backward space harmonic. O merator operation is also theoretically possible and the theory for a single-harmonic-wave generator is praentod. Generator operation was not oburvod, however, in the device that w n tested.

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