Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1997-07-29
1999-08-24
Ramirez, Nestor
Electrical generator or motor structure
Dynamoelectric
Rotary
310 68B, 310268, 310156, 310 43, H02K 709
Patent
active
059428244
ABSTRACT:
A motor comprising: a rotor which is supported via a rotating shaft in a radial direction of the rotating shaft, the rotating shaft being disposed around a fixed shaft provided on the side of a stator to form a dynamic-pressure bearing; a stator-side thrust magnet disposed in the stator so as to support the rotor with respect to the stator in a thrust direction of the rotating shaft; a rotor-side thrust magnet disposed in the rotor; and a rotating main body portion mounted to the rotating shaft of the rotor and formed integrally by a resin magnetic material, in which a main magnet portion, an FG magnet portion for generating a speed-of-rotation detecting pulse, and a rotor-side thrust magnet portion serving as said rotor-side thrust magnet are respectively polarized at predetermined positions in the rotating main body portion. As a result, the reliability of an optical deflector in which the motor is used improves and the number of parts and the number of assembling processes are both reduced due to a simple structure. Further, a balance correction operation of the rotor is eliminated so as to allow a simple manufacturing operation, and even when the rotor is rotated at high speed, a stable optical scanning operation can be effected.
REFERENCES:
patent: 5574322 (1996-11-01), Nii et al.
patent: 5623382 (1997-04-01), Moritan et al.
patent: 5650674 (1997-07-01), Hayashi
patent: 5835124 (1998-11-01), Fukita et al.
Ito Hiromi
Kato Seiichiro
Ono Hiromu
Shioya Kohei
Fuji 'Xerox Co., Ltd.
Lam Thanh
Ramirez Nestor
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