Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1989-12-07
1991-09-10
Wong, Peter S.
Electrical generator or motor structure
Dynamoelectric
Rotary
310 90, 360 9908, 384478, H02K 502, G11B 3314
Patent
active
050476777
ABSTRACT:
A motor for driving a magnetic disk in which the rotational center of the magnetic disk is a fixed shaft. The motor has a frame, a shaft formed integral with the frame, an armature, a bearing provided on the shaft, a hub to which a magnetic disk is securable, a magnetic sealing material arranged in the vicinity of the bearing and a magnetic material opposed to the sealing material. A magnetic seal is arranged between the magnetic sealing mateial and the magnetic material. The frame, the shaft, the hub and the magnetic disk are formed of aluminum, so that changes in temperature will not adversely affect motor performance due to the differences in thermal expansion of these motor parts. The magnetic material is in the form of a sleeve which enables the motor to be magnetically sealed and prevents foreign matter in the motor from reaching the magnetic disk.
REFERENCES:
patent: 4531846 (1985-07-01), Raj
patent: 4772032 (1988-09-01), Raj et al.
patent: 4797762 (1989-01-01), Levy et al.
patent: 4814652 (1989-03-01), Wright
patent: 4818907 (1989-04-01), Shirotori
patent: 4882643 (1989-11-01), Shirotori
patent: 4905110 (1990-02-01), Krum et al.
Katakura Koichi
Mineta Sadayoshi
Rebsch D. L.
Sankyo Seiki Mfg. Co. Ltd.
Wong Peter S.
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