Disk drive with rectifier circuit for parking the head carriers

Details Disk drive with rectifier circuit for parking the head carriers Disk drive with rectifier circuit for parking the head carriers

1994-06-01

1996-01-23

Psitos, Aristotelis

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360105, 318561, G11B 2102

Patent

active

054869579

ABSTRACT:
A magnetic recording disk drive has a rectifier circuit made up of bipolar transistors. Upon removal of power to the spindle motor, the rectifier circuit converts AC spindle motor output to DC actuator coil current to drive the actuator to a parking ramp where the read/write heads are "unloaded" from their respective disk surfaces. The transistor emitter-base junctions are connected to a switch, such as a pair of field-effect transistors, that is responsive to removal of power to the spindle motor. The total current flowing in these emitter-base junctions is small due to the use of series resistors and because the current in the emitter-base circuit does not flow through the actuator coil. The emitter-collector paths of the bipolar transistors are connected as a three-phase, full-wave rectifier to the actuator coil. When the transistors are turned on by the small amount of current from the spindle motor windings through the emitter-base junctions, the majority of current from the windings is allowed to flow through the emitter-collector paths of those transistors to the actuator coil.

REFERENCES:
patent: 4237501 (1980-12-01), Barmache et al.
patent: 4831469 (1989-05-01), Hanson et al.
patent: 4866554 (1989-09-01), Stupeck et al.
patent: 5231549 (1993-07-01), Morehouse et al.
G. D. Carpenter et al., "Delta Voltage Control During Actuator Retract", IBM Technical Disclosure Bulletin, vol. 35, No. 1B, Jun. 1992, pp. 337-339.

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