US 6,982,513 B2
Recording disk drive motor, recording disk drive employing the motor, a method of manufacturing a stator used in the recording disk drive motor, and core plate that is used in the manufacture of the stator
Yoshio Fujii, Kanzaki-gun (Japan); Susumu Terada, Hikone (Japan); Masato Yamamoto, Tenri (Japan); and Yosuke Yamada, Eichi-gun (Japan)
Assigned to Nidec Corporation, Kyoto (Japan)
Filed on May 20, 2003, as Appl. No. 10/249,927.
Claims priority of application No. 2002-283724 (JP), filed on Sep. 27, 2002; and application No. 2002-292511 (JP), filed on Oct. 04, 2002.
Prior Publication US 2004/0061404 A1, Apr. 01, 2004
Int. Cl. H02K 1/12 (2006.01)
U.S. Cl. 310—254 25 Claims
OG exemplary drawing
 
1. A recording disk drive motor employed in a recording disk drive that supports and rotates a replaceable recording disk that is 30 mm or less in diameter, the recording disk drive motor comprising:
a stationary member which comprises:
a stator core which comprises:
a core back having a port formed in the core back by omitting a portion of the core back, and an arc shaped inner surface; and
a plurality of stator teeth that are disposed so as to be equally spaced apart with each other and extend inward in the radial direction from the arc shaped inner surface of the core back;
a base member on which the stator core is mounted; and
polyphase windings that are wound around the stator teeth;
a rotor which comprises:
a rotor magnet that is disposed inside the arc shaped inner surface of the core back and which faces the stator teeth in a radial direction; and
a recording disk mounting portion for supporting the recording disk; and
a sliding bearing that is cylindrical in shape, has a through hole formed along a rotational axis of the rotor, and rotatably supports rotation of the rotor in the radial direction;
wherein the sliding bearing is concentric with the arc shaped inner surface of the core back, and the rotor is magnetically attracted in the opposite direction of the port of the core back; and
one end surface of the core back is disposed on each side of the port, and a distance between each end surface of the core back is equal to a distance on the arc shaped inner surface of the core back on which at least one stator tooth from each phase are disposed.