Drum motor for VCR

Details Drum motor for VCR Drum motor for VCR

1993-08-19

1995-11-28

LaBalle, Clayton E.

Electrical generator or motor structure

Dynamoelectric

Rotary

310 67R, H02K 714, H02K 708

Patent

active

054711045

ABSTRACT:
A drum motor for a VCR includes radial and thrust hydrodynamic bearings that are composed of a rotor-side bearing member formed by bringing a pair of first and second thrust plates into direct contact with both end surfaces of a radial bearing element and integrating them into one unit, and a stator-side bearing member in the form of a radial sleeve the inner peripheral surface and both end surfaces of which respectively cooperate with the outer peripheral surface of the radial bearing element and the mutually facing surfaces of the first and second thrust plates. A rotor magnet is secured to a rotating shaft. A motor casing is secured to the outer peripheral surface of the radial sleeve. A stator unit is secured to the motor casing. A dynamic pressure generating groove is provided on either each end surface of the radial sleeve or each of the mutually facing surfaces of the first and second thrust plates. The run-out of a rotor-side unit in both the thrust and radial directions is made extremely small and the change in the relative height of the rotor-side unit in the thrust direction due to a change of the position of the motor in which it is used is minimized.

REFERENCES:
patent: 3383141 (1968-05-01), de Bennetot
patent: 3950039 (1976-04-01), Huber et al.
patent: 4839546 (1989-06-01), Kitahara
patent: 5019738 (1991-05-01), Weilbach et al.
Patent Abstracts of Japan, vol. 14, No. 222 (E-926) (4165) May 10, 1960.
Patent Abstracts of Japan, vol. 16, No. 74 (E-1170) Feb. 24, 1992.

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