CMOS disk drive motor control circuit having back-EMF regulator

Details CMOS disk drive motor control circuit having back-EMF regulator CMOS disk drive motor control circuit having back-EMF regulator

1994-11-22

1997-02-04

Martin, David S.

Electricity: motive power systems

Limitation of motor load, current, torque or force

318368, 360 75, 360105, H02P 300

Patent

active

056002173

ABSTRACT:
A CMOS disk drive motor control circuit which has back-EMF regulator circuitry which prevents the back-EMF from the disk drive motor from exceeding a predetermined level. The back-EMF provides an alternate power source for parking the read/write head when power is removed from the disk drive. The circuit is fabricated as a single CMOS integrated circuit which is coupled between a power supply and the disk drive motor. The disk drive control circuit also includes a blocking diode through which power from the power supply flows to the motor and which prevents dissipation of a back-EMF from the motor when power is removed from the motor, and disk drive head parking circuitry which uses the back-EMF to retract and park the disk drive head.

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