Spindle motor

Details Spindle motor Spindle motor

1996-04-04

1997-12-16

Dougherty, Thomas M.

Electrical generator or motor structure

Dynamoelectric

Rotary

310156, 310 42, 310261, H02K 2122

Patent

active

056989156

ABSTRACT:
A spindle motor comprising a bracket, a shaft member provided on the bracket, a rotor rotatably mounted to the shaft member through a pair of bearings, a rotor magnet mounted to the rotor, a stator disposed in opposite relation to the rotor magnet, and magnetic fluid sealing means respectively disposed outwardly of a pair of the bearings. The shaft member is provided with an air passage extending in the axial direction, and a communication passage for communicating the air passage with a space between a pair of the bearings. A cap member which is improved in its structure is disposed outwardly of one of the paired bearings. An annular projection for positioning the rotor magnet concentrically with respect to the rotor is provided on a magnet mount portion of the rotor.

REFERENCES:
patent: 4049984 (1977-09-01), Ishii et al.
patent: 4249298 (1981-02-01), Kanamaru et al.
patent: 4423345 (1983-12-01), Nilsson
patent: 4641422 (1987-02-01), Weaver
patent: 5383265 (1995-01-01), Nishizawa

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