Spindle motor for driving discs

Details Spindle motor for driving discs Spindle motor for driving discs

1988-08-08

1989-10-17

Salce, Patrick R.

Electrical generator or motor structure

Dynamoelectric

Rotary

360 9701, 310DIG3, 310 68B, 310156, H02K 122, H02K 2112

Patent

active

048749761

ABSTRACT:
A spindle motor for rotating magneto-optical discs that are attracted and held on a fixed position at an end of a motor driven shaft by means of a clamping rotor with internal field magnets. The spindle motor has a set of stator coils and a set of field magnets held internally mounted on the shaft side of the clamping rotor. The field magnet and stator coil sets are arranged at a regular interval in a ring around the circumference of the clamping rotor and of a shield member of the spindle motor respectively, leaving a thin gap between the stator coils and the field magnets. The saucer-like clamping rotor is made of a non-magnetic material and applied at the disc side, on which side a magneto-optical disc is charged, of the rotary shaft. The field magnets, being fitted on the face of the clamping rotor opposed to the magneto-optical disc mounted face, function both as a means for driving the clamping rotor for motor operation, and as a disc-attracting device.

REFERENCES:
patent: 4581667 (1986-04-01), Gerfast
patent: 4585963 (1986-04-01), Wilkinson
patent: 4658312 (1987-04-01), Elsasser
patent: 4757222 (1988-07-01), Shiraki et al.

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