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AssigneeThe United States of America as represented by the Administrator of the National Aeronautics and Space Administration
InventorJesse M. Madey
Estimating the term…
An electric motor having a low speed shaft that rotates at a speed much slower than the speed of a high speed shaft comprises a stator having a cylindrical bore with a longitudinal axis and a rotor that carries the low speed shaft and rotates in the bore eccentrically about the axis so that there is contact and no magnetic gap between a relatively small portion of the rotor periphery and the periphery of the bore. A magnetic field, rotating at the speed of the high speed shaft, is applied to the periphery of the bore. The field has longitudinally extending magnetic field components of opposite polarity so that around approximately 180.degree. of the bore the field extends in a first direction, while around the other 180.degree. of the bore the field extends in the opposite direction. The rotor includes permanent magnet pole faces at opposite ends of the bore.
A rotary electric device for establishing high speed ratios between a pair of rotating shafts comprising a stator having a cylindrical bore member with a longitudinal axis, a rotor member positioned to roll in the bore about the axis so that there is contact and no magnetic air gap between a relatively small portion of the rotor and the periphery of the bore, a high speed shaft, the high speed shaft having a first section rotatably coupled in the stator axially aligned with the axis and a second section offset from the first section and rotatably coupled in the rotor member, a low speed shaft coupled to the rotor in coaxial alignment with the second section of the high speed shaft for providing eccentric turning of the low speed shaft, means for applying a rotating magnetic field to the periphery of one of the members, said field having a longitudinally extending magnetic field component, the other of said members including longitudinally spaced magnetic pole faces that are alternately attracted to different portions of the periphery of the one member as the magnetic field rotates about the periphery of the one member.
Dependencies are inferred from the claim text.