Brushless motor and disk drive device using the same
AssigneeNidec Corporation
InventorsNaoki Mine, Eiji Miyamoto
Life of this patent
Estimating the term…
Abstract
A brushless motor according to the present invention provided with a recording disk in a rotational member and serving to rotate the recording disk together with the rotational member comprises a first position detecting means for detecting a rotational position of the rotational member, a second position detecting means for detecting a rotational position of the recording disk, wherein a mode for rotating the rotational member at a high speed by a detection signal of the first position detecting means and a mode for rotating the rotational member at a low speed by a detection signal of the second position detecting means are generated. Thereby, the two rotation states whose rotation speeds are different can be obtained in a simplified constitution.
Claims6
A brushless motor for rotating a recording disk which is installed thereon when the brushless motor stops, the recording disk having a pattern thereon, the brushless motor comprising:
- a stationary member;
- a rotational member rotating relative to the stationary member, the rotational member having a disk mounting part on which the recording disk is installed;
- a first position detecting means for detecting a first rotational position of the rotational member, wherein a detection signal of the first position detecting means is used for controlling the brushless motor at a first rotating speed;
- a second position detecting means for detecting the pattern formed on the disk installed on the disk mounting part, wherein a detection signal of the second position detecting means is used for controlling the brushless motor at a second rotating speed different from the first rotating speed.
Dependencies are inferred from the claim text.