Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1991-09-03
1993-05-25
Stephan, Steven L.
Electrical generator or motor structure
Dynamoelectric
Rotary
310 90, 360 9808, 360 9905, H02K 700, G11B 1708, G11B 5016, G11B 1702
Patent
active
052143260
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 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 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.
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LaBalle C.
Nippon Densan Corporation
Stephan Steven L.
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