Motor control for data disc rotating systems

Details Motor control for data disc rotating systems Motor control for data disc rotating systems

1982-12-21

1985-01-15

Truhe, J. V.

Electricity: motive power systems

Braking

Friction braking

318254, 318380, H02K 7102

Patent

active

044940580

ABSTRACT:
A system for rotating a data storage disc in a disc drive and for rapidly bringing the disc to a halt comprises a brushless motor fed with direct current in its windings by a motor drive circuit which current is also fed to a solenoid to hold a spring loaded solenoid arm from pressing a brake against a shaft to brake the disc, the motor control circuit using the current caused by back emf in the windings of the motor to provide motor braking while passing the current through the solenoid which applies the brake when the motor speed falls below a predetermined limit, the solenoid also being employed as a current smoothing choke.

REFERENCES:
patent: Re19547 (1935-04-01), Wright
patent: 1077737 (1913-11-01), Murphy et al.
patent: 3188545 (1962-12-01), Sheheen
patent: 3253203 (1966-05-01), Bardwell
patent: 3486097 (1969-12-01), Shekro
patent: 3916272 (1975-10-01), Grunleitner et al.
patent: 3959700 (1976-05-01), Sugiura et al.

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