Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1996-07-01
1998-10-13
Stephan, Steven L.
Electrical generator or motor structure
Dynamoelectric
Rotary
310 90, 310 68R, 360 9701, 360 9908, H02K 700, H02K 1100
Patent
active
058216464
ABSTRACT:
A spindle motor comprises a stationary shaft, a rotor hub rotatably mounted by ball bearings to the stationary shaft, and annular sealing members disposed between the outer surface of the stationary shaft and the inner side of the rotor hub axially outwardly of the ball bearings. The sealing member is directly fitted onto the outer race of the corresponding ball bearing. The outer race of each ball bearing is high precision finished so that the sealing member is definitely coaxial with the stationary shaft regardless of the finishing accuracy on the inner side of the rotor hub. Accordingly, the radial distance between the inner side of the sealing member and the outer surface of the stationary shaft can be minimized with high precision offering an excellent labyrinth effect.
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Chuta Masanobu
Iida Hiromi
Matsumoto Hiroshi
Satake Junko
Tomita Koji
Enad Elvin G.
Nidec Corporation
Stephan Steven L.
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