Back to results
US 6,806,601 B2Granted
Brushless motor and disk drive including the same
AssigneeNidec Corporation
InventorEiji Miyamoto
Life of this patent
Estimating the term…
Abstract
A brushless motor includes a rotor position detecting device disposed between stator teeth, rather than directly below a rotor magnet, so that the distance between a lower end of a rotor magnet and a stationary frame is minimized. This results in a thinner brushless motor than conventional designs. In the preferred embodiment of the present invention, the rotor position detecting device is a Hall device.
Claims20
A brushless motor comprising:
- a frame;
- a rotor rotatably supported by said frame;
- a rotor magnet fixed to said rotor;
- a stator fixed onto said frame, said stator being spaced away from said rotor magnet to define a gap therebetween, said stator having a substantially annular base portion and a plurality of teeth circumferentially adjacent to each other and projecting from said annular base portion toward said rotor magnet with stator windings wound over each of said plurality of teeth;
- and
- a rotor rotational position detecting device disposed between the adjacent teeth of said stator;
- wherein said stator windings are unevenly wound over said teeth to define a space adapted to accommodate said rotor rotational position detecting device therein.
4 more elements
A disk drive having a disk for reading and/or writing information, comprising:
- a housing;
- a brushless motor fixed to said housing;
- and
- information access means for writing and/or reading information in and/or from a predetermined position on said disk,
- said brushless motor comprising:
- a frame;
- a rotor rotatably supported by said frame;
- a rotor magnet fixed to said rotor;
- a stator fixed onto said frame, said stator is spaced away from said rotor magnet to define a gap therebetween, said stator comprising a substantially annular base portion and a plurality of teeth circumferentially adjacent to each other and projecting from said annular base portion toward said rotor magnet with stator windings wound over each of the teeth;
- and
- a rotor rotational position detecting device fixed onto or over said frame and disposed between the adjacent teeth of said stator;
- wherein said stator windings are unevenly wound over said teeth to define a space in which said rotor rotational position detecting device is to be disposed.
9 more elements
Dependencies are inferred from the claim text.