Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1993-09-16
1996-02-20
LaBalle, Clayton E.
Electrical generator or motor structure
Dynamoelectric
Rotary
310254, 310DIG6, 310208, H02K 714, H02K 112, H02K 326
Patent
active
054931576
ABSTRACT:
A brushless motor of the present invention generally has a stator and a rotor in a clean chamber of contaminant free atmosphere. The stator has a motor base, a shaft provided on the motor base and a plurality of coils on the motor base. The rotor has a bearing holder having a center hole for supporting bearings, a hub connected to the bearing holder for mounting information storage discs such as hard discs and a magnet having magnetic poles provided on the hub facing to the coils. The brushless motor of the present invention further has a top cover provided on the bearing holder for covering the center hole thereof, a cylindrical chamber defined by an outer wall of the bearing holder and an inner wall of the hub in the rotor, the magnet is provided on the inner wall of the bearing holder, and a coreless coil assembly having the plurality of coils without cores made of magnet materials being provided on the motor base in such a manner that the coreless coil assembly protrudes into the cylindrical chamber so as to form narrow clearances between the walls of the cylindrical chamber and the coreless coil assembly for a labyrinth path in the clean chamber.
REFERENCES:
patent: 4665331 (1987-05-01), Sudo et al.
patent: 4833568 (1989-05-01), Berhold
patent: 4900958 (1990-02-01), Kitahara et al.
patent: 4950527 (1990-08-01), Yamada
patent: 4962329 (1990-10-01), Fujita et al.
patent: 5006765 (1991-04-01), Schmider
patent: 5012571 (1991-05-01), Fujita et al.
patent: 5177650 (1993-01-01), Jabbari et al.
patent: 5334895 (1994-08-01), Morioka et al.
LaBalle Clayton E.
Meller Michael N.
Victor Company of Japan Ltd.
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