Patent ID: 11876431
Assignee: IWAKI CO., LTD.
Field: Mechanical elements (Mechanical engineering)
Classification: CPC F  H  A | IPC A  F  H

Claim 6:
7. A drive device comprising:
a rotor,
a magnetic bearing supporting the rotor by magnetic force, and
a drive mechanism rotatably driving the rotor, wherein the magnetic bearing includes:
a bearing rotor member made of a magnetic material disposed in the rotor; and
a bearing stator member arranged around the bearing rotor member, wherein
the bearing stator member includes a core made of a magnetic material and a coil wound around the core, and
a longitudinal cross-sectional shape of the core has:
a first part extending in a first direction orthogonal to a direction opposed to the bearing rotor member, and wound around with the coil;
a pair of second parts extending from both end portions in the first direction of the first part toward the bearing rotor member side and subsequently extending in a direction approaching each other in the first direction; and
a pair of third parts extending from respective distal end portions of the pair of second parts toward the bearing rotor member side, wherein

the bearing rotor member includes a permanent magnet supplying a bias magnetic flux to a magnetic circuit formed by the bearing rotor member and the core, and
a length in the first direction of the coil wound around the first part is greater than a distance between opposed surfaces in the first direction of the pair of third parts.