Magnetic disk drive device and spindle motor for use in the same

Details Magnetic disk drive device and spindle motor for use in the same Magnetic disk drive device and spindle motor for use in the same

1992-10-20

1994-01-25

Stephan, Steven L.

Electrical generator or motor structure

Dynamoelectric

Rotary

310 67R, H02K 714, H02K 708

Patent

active

052818861

ABSTRACT:
A magnetic disk drive device has a spindle motor for rotatingly driving magnetic disks in a predetermined direction, and a clamp member for mounting the disks on the spindle motor. The spindle motor has a hub rotatably supported through bearings and having a portion for mounting the magnetic disks, a rotor magnet carried by the hub, a stator disposed to oppose to the rotor magnet, and magnetic fluid seal arrangement for preventing scattering of lubricant from the bearing means. The magnetic disk drive device further has a magnetic shield disposed on the radially outer side of the magnetic fluid seal arrangement. One of the bearings rotatably supporting the hub may be charged with a lubricant having a comparatively low viscosity, while the other bearing may be charged with a lubricant having a comparatively high viscosity.

REFERENCES:
patent: 4628384 (1986-12-01), Raj et al.
patent: 4797013 (1989-01-01), Raj et al.
patent: 4827168 (1989-05-01), Nakajima
patent: 4996613 (1991-02-01), Hishida
patent: 5045738 (1991-09-01), Hishida et al.
patent: 5047677 (1991-09-01), Mineta et al.
patent: 5051853 (1991-09-01), Hosoya
patent: 5061868 (1991-10-01), Iwazaki et al.
patent: 5153470 (1992-10-01), Miyaji et al.
patent: 5160866 (1992-11-01), Hishida et al.

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