CPC F04C 2/1076 (2013.01) [F04C 2/084 (2013.01); F04C 2240/10 (2013.01); F04C 2240/20 (2013.01); F04C 2250/20 (2013.01); F04C 2250/30 (2013.01)] | 6 Claims |
1. A rotary machine comprising an outer-member having an outer-member length and an outer-member axis, and a rotor having a rotor length and a rotor axis, said rotor disposed within said outer-member,
said rotor, along at least a portion of said rotor length, having a rotor helical profile, and a rotor shape that is inwardly offset from a hypotrochoidal shape at any cross-section transverse to said rotor axis, said rotor configured to spin about said rotor axis,
said outer-member, along at least a portion of said outer-member length, having an outer-member helical profile, and an outer-member shape at any cross-section transverse to said outer-member axis that is an outer envelope formed when said rotor shape undergoes planetary motion, said outer-member configured to spin about said outer-member axis,
wherein said rotor and said outer-member are held at a fixed eccentricity with said rotor axis offset relative to said outer-member axis so that during operation of said rotary machine, said rotor undergoes planetary motion relative to said outer-member without orbiting.
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