Patent ID: 7626295

Claim:
A flat eccentric rotor equipped with a fan, comprising the following structural elements: a shaft support section provided in a center of rotation of said flat eccentric rotor; an electromagnetic drive device disposed radially outwardly of said shaft support section, said electromagnetic drive device being an axial-gap magnet; an eccentric weighting device shifting a center of gravity of said rotor to an eccentric position relative said center of rotation, the eccentric weighting device being disposed radially outwardly of the shaft support section, said electric weighting device being an eccentric member comprising tungsten and disposed at least radially outwardly of said magnet; an impeller section provided at at least one portion on an outer periphery of the rotor; said impeller section being a portion of a first fan member of a low specific gravity relative to said eccentric member and said impeller section being disposed at least on an opposite side of said rotor from said eccentric member; said impeller section of said first fan member and an outer periphery of said eccentric member at least partially extend in an axial direction of said rotor; said impeller section being a first impeller section; said eccentric member being configured as a second fan member with a high specific gravity relative to said first fan member and has a second impeller section at said outer periphery; said first fan member including a first flat section radially inward of said first impeller section; said second fan member comprising a second flat section above said axial-gap magnet and said second impeller section being disposed radially outwardly of said magnet and said second flat section; and said first and second the fan members being connected via said first and second flat sections which are bonded to and held by said axial-gap magnet.