Patent ID: 6717311
Filing Date: 2004-04-06
Classification: A61M,F16C

Abstract:
Apparatus comprising a rotor, a stator, first and second axially spaced combinations each including at feast one permanent magnet disposed on each of said rotor and said stator on opposite sides of a respective axially extending gap portion and polarized to levitate said rotor and further including an electrically energizable coil wound as a toroid over said respective at least one stator magnet and with said respective at least one rotor magnet disposed substantially within the toroid for modulating magnetic flux between said respective stator and rotor magnets, electrical circuitry for regulating electrical energy to said coils for stabilizing said rotor axially, and said rotor magnets being offset axially of said stator magnets respectively such that said rotor magnets are offset axially inwardly of said corresponding stator magnets or such that said rotor magnets are offset axially outwardly of said corresponding stator magnets.