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AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsAkihiko Wakitani, Takao Yoshitsugu, Shoichi Yoshikawa, Akihide Matsuo, Hideshi Fukutani
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It is an object of the present invention to provide a motor capable of reducing a loss as much as possible, and securing minimum vibration proof performance and reliability by definitely defining the upper and lower limits of a minimum shaft diameter in conformity with a disk load, the service number of revolutions or the like. In a shaft-fixed type motor of the fluid bearing specifications, the diameter d (mm) of a fixed shaft is set so as to satisfy the relation of α3·M1 >d3>M1, where M1=J1·(N/1000)2·k2·D, J1 being a coefficient to be experimentally determined, N(rpm) the service number of revolutions, k the number of a disk-shaped recording media, D (inch) the diameter of the disk-shaped recording medium, and α a ratio of the maximum diameter to the minimum diameter of the fixed shaft.
A motor having a magnet provided on a rotor rotatably supported on a fixed shaft by a rotary sleeve via a fluid bearing and a stator winding mounted to a stator core facing said magnet, said motor for rotationally driving a disk-shaped recording medium placed on said rotor around the shaft axis wherein
A motor having a main magnet provided on a rotor rotatably supported by inserting a rotor shaft into a shaft hole in a fixed sleeve formed on a stator side, and a stator core mounted on the stator side facing said main magnet, said motor for rotationally driving a disk-shaped recording medium mounted on said rotor around the shaft axis with a fluid bearing between said rotor shaft and said fixed sleeve wherein
Dependencies are inferred from the claim text.