| 摘要 |
PURPOSE: To provide a bearing device using a permanent magnet which facilitates dimensional control and assembly of a rotary permanent magnet with small centrifugal expansion of the permanent magnet to eliminate apprehension of causing centrifugal destruction of the permanent magnet. CONSTITUTION: By a rotary permanent magnet 15 provided in a permanent magnet rotary device 11 of a rotary unit 1 rotated with a vertical shaft serving as the center and a magnetic supporter device 13 provided in a fixed housing, the rotary unit 1 is contactlessly supported by magnetic force. A plurality of the annular rotary permanent magnets 15 are concentrically arranged in an axial direction end face of a disk-shaped non-magnetic material-made rotary member 14 of the permanent magnet rotary device 11, and the magnetic supporter device 13 is arranged so as to be opposed to the rotary permanent magnet 15 in a direction of a rotary shaft center A of the rotary unit 1. A plurality of annular recessed grooves 18 are concentrically formed in an axial direction end face of the non-magnetic material-made rotary member 14, to mount the rotary permanent magnet 15 by press fitting one by one in each recessed groove 18. |
