Spindle motor

Details Spindle motor Spindle motor

1990-02-15

1991-09-03

Stephan, Steven L.

Electrical generator or motor structure

Dynamoelectric

Rotary

310 67R, 369269, H02K 516

Patent

active

050457381

ABSTRACT:
A spindle motor having a shaft member secured to a fitting member, a rotary member which is rotatable relatively to the shaft member, a rotor magnet fitted to the rotary member in such a manner that the rotor magnet confronts the rotor magnet and a stator, wherein a pair of inner annular grooves are formed in the shaft member, a pair of outer annular grooves are formed in the rotary member and a plurality of ball members are accommodated in ball-accommodating space defined by these annular grooves. A spindle motor having a fitting member having a hollow cylindrical portion, a shaft member which is rotatable relatively to the fitting member, a rotary member secured to the shaft member, a rotor magnet fitted to the rotary member and a stator disposed in such a manner that the stator confronts the rotor magnet, wherein a pair of inner annular grooves are formed in the shaft member, a pair of outer annular grooves are formed in the inner surface of the cylindrical portion and a plurality of ball members are accommodated in a ball-accommodating space defined by these annular grooves.

REFERENCES:
patent: 4378290 (1974-01-01), Papst et al.
patent: 4585963 (1986-04-01), Wilkinson et al.
patent: 4672250 (1987-06-01), Seitz
patent: 4900958 (1990-02-01), Kitahara et al.
patent: 4949000 (1990-08-01), Petersen

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