Motor and a heat sink apparatus using the same

Details Motor and a heat sink apparatus using the same Motor and a heat sink apparatus using the same

1999-02-19

2000-07-04

Ramirez, Nestor

Electrical generator or motor structure

Dynamoelectric

Rotary

310 63, H02K 708

Patent

active

060843284

ABSTRACT:
The motor and the heat sink apparatus using the motor according to the present invention include a frame having a cup-shaped frame housing; a stator mounted to an outer circumference of the frame housing; a sleeve fitted into the frame housing such that one end of the sleeve is supported on a seat formed inside the frame housing; a shaft rotatably fitted into the sleeve; a rotor having a magnet disposed opposite to the stator; oil filled into a clearance between the shaft and the sleeve; and a fixing ring inserted into the frame housing to hold the sleeve against the seat. Because the sleeve is fixedly sandwiched between the seat and the fixing ring, the stress acting on the sleeve in the radial direction is reduced, preventing an inner diameter deformation of the sleeve. This in turn produces a quiet motor with a long life and a heat sink apparatus incorporating this motor which is small, quiet, of long-life and excellent in cooling efficiency.

REFERENCES:
patent: 5701045 (1997-12-01), Yokozawa et al.
patent: 5925949 (1999-07-01), Jung et al.
JP Abstract 57-15120, Tamaki "Dynamic Pressure Type Spindle Unit", Jan. 26, 1982.

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