Disk driving motor

Details Disk driving motor Disk driving motor

1996-02-02

1998-08-18

Dougherty, Thomas M.

Electrical generator or motor structure

Dynamoelectric

Rotary

310103, 310268, 310266, 310114, 310156, 360 9903, 360 9907, 360 9912, 360 9701, 369270, 369271, H02K 122, H02K 2112

Patent

active

057961930

ABSTRACT:
A rotor is formed by a rotary frame 3 composed of a nonmagnetic material, a field magnet 5, a yoke 4 and an auxiliary yoke 7. A disk 12 is mounted on the rotary frame 3. An opening 4b is formed in the yoke 4 to thereby cause attractive magnetic flux from the field magnet 5 to effectively act on a clamping yoke 13 of the disk, so that the disk 12 can be firmly clamped. The yoke 4 covers the circumferential part of the field magnet 5 on its disk 12 side to thereby cut off magnetic flux leakage toward the disk 12, so that its adverse effect on the recording surface of the disk 12 can be avoided. The auxiliary yoke 7 so arranged that a stator coil 6 is interposed between the auxiliary yoke 7 and the field magnet 5 is secured to the rotary frame 3 to thereby increase effective rotating magnetic flux so that output torque is increased.

REFERENCES:
patent: 3845339 (1974-10-01), Merkle et al.
patent: 4401419 (1983-08-01), Rabe
patent: 4874976 (1989-10-01), Ohsawa et al.
patent: 4987333 (1991-01-01), Noguchi et al.
patent: 5128818 (1992-07-01), Koizumi et al.
patent: 5153470 (1992-10-01), Miyaji et al.
patent: 5254895 (1993-10-01), Koizumi
patent: 5453650 (1995-09-01), Hashimoto et al.

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