Motor having dynamic pressure bearing, and rotator device having

Details Motor having dynamic pressure bearing, and rotator device having Motor having dynamic pressure bearing, and rotator device having

1998-10-05

2000-05-16

Ramirez, Nestor

Electrical generator or motor structure

Dynamoelectric

Rotary

310 67R, 384 99, 384100, 384107, 359200, 359198, 359216, 359217, H02K 516, G02B 2608

Patent

active

060641304

ABSTRACT:
A dynamic pressure bearing having a reduced manufacturing time and cost is produced using a single dynamic pressure generating groove. A motor having a dynamic pressure bearing according to one embodiment of the present invention includes a supporting body, a stator coil mounted to the supporting body, a rotor having opposing upper and lower surfaces, a rotor magnet for generating a rotational force in cooperation with the stator coil, the rotor magnet being attached to one of the upper and lower surfaces of the rotor so as to oppose the stator, a fixed shaft forming a dynamic pressure bearing mounted to the supporting body, and a disc-shaped lower thrust cap member attached to the supporting body proximate the lower surface of the rotor. The rotor has an inner peripheral surface defining a hole through which the fixed shaft passes. The upper and lower surfaces of the rotor and an upper surface of the lower thrust cap member are formed without any dynamic pressure generating grooves, a spiral groove is formed in one of the outer circumferential surface of the fixed shaft and the inner peripheral surface of the rotor, and the other one of the outer circumferential surface of the fixed shaft and the inner peripheral surface of the rotor is formed without any dynamic pressure generating grooves. In a particularly preferred embodiment, the spiral groove is formed in the outer circumferential surface of the fixed shaft.

REFERENCES:
patent: 4805972 (1989-02-01), Tanaka et al.
patent: 4883367 (1989-11-01), Maruyama
patent: 4984881 (1991-01-01), Osada et al.
patent: 5018881 (1991-05-01), Asada
patent: 5097164 (1992-03-01), Nakasugi et al.
patent: 5596443 (1997-01-01), Konno et al.
patent: 5658080 (1997-08-01), Ichiyama
patent: 5710470 (1998-01-01), Komata et al.
patent: 5847479 (1998-12-01), Wang et al.

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