Drive motor controller for low power disk drive

Details Drive motor controller for low power disk drive Drive motor controller for low power disk drive

1991-06-18

1993-09-21

Levy, Stuart S.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the record

360 71, G11B 1928, G11B 1900

Patent

active

052464792

ABSTRACT:
A hard disk drive digital storage system provides increased power efficiency and reduced power losses by using a switching regulator type DC to DC power converter, to control spindle motor speed, in which a variable duty cycle, low "ON" resistance n-channel power MOSFET transistor is located near the ground side of the motor drive circuit. A voltage booster circuit provides higher gate control switching voltages to the motor power phase commutation switching transistors. A sense resistor is connected between the converter and ground, and the voltage developed across this sense resistor provides a signal which is coupled to the motor control circuit to vary the duty cycle of the converter to regulate the peak current applied to the motor.

REFERENCES:
patent: 4359674 (1983-11-01), Gotou
patent: 4527102 (1985-07-01), Gotou
patent: 4786995 (1988-11-01), Stupeck et al.
patent: 4831469 (1989-05-01), Hanson et al.
patent: 4839754 (1989-06-01), Gami et al.
patent: 4843288 (1989-06-01), Volz et al.
"Peripherals", J. Voelcker, IEEE Spectrum, Feb. 1990.

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