Spindle motor

Details Spindle motor Spindle motor

1994-10-14

1996-07-16

LaBalle, Clayton E.

Electrical generator or motor structure

Dynamoelectric

Rotary

310 42, 310 90, H02K 1500, H02K 714, H02K 708

Patent

active

055369863

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 rotors, 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: 4130770 (1978-12-01), Wrobel

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