Patent ID: 7902706

Claim:
A rotational apparatus with a passive magnetic bearing, the rotational apparatus comprising: a stator assembly comprising: a stator body having a cavity with a first cavity end and a central cavity axis passing through a center of the first cavity end; and a tapered array of shorted conducting circuits supported by the stator body, the tapered array of shorted conducting circuits having an inner profile that defines a tapered shape extending toward the first cavity end; and a rotor assembly comprising a rotor body having a first body end and a central body axis passing through the center of first body end, the rotor body including a first tapered portion extending along the central body axis and tapering toward the first body end, wherein a shape of the tapered portion of the rotor body is complementary to the tapered shape of the inner profile of the tapered array of shorted conducting circuits; and a tapered magnetic ring disposed at the first tapered portion of the rotor body, the tapered magnetic ring having a plurality of magnetic arrays; wherein the plurality of magnetic arrays comprises a plurality of magnetic Halbach arrays; wherein each of the plurality of magnetic Halbach arrays comprises five magnetic segments; wherein a first end magnetic segment and a last end segment are smaller than middle segments of each array of five segments, and wherein the rotor assembly is disposed in the cavity of the stator assembly.