Decreasing spin up time in a disk drive by adjusting a duty...

Details Decreasing spin up time in a disk drive by adjusting a duty... Decreasing spin up time in a disk drive by adjusting a duty...

2005-11-22

2005-11-22

Fletcher, Marlon T. (Department: 2837)

Electricity: motive power systems

Positional servo systems

Pulse-width modulated power input to motor

C318S254100, C318S434000, C318S811000, C318S560000

Reexamination Certificate

active

06967458

ABSTRACT:
A disk drive is disclosed comprising a spindle motor for rotating a disk, wherein the current applied to the spindle motor is controlled by adjusting a duty cycle of a pulse width modulated (PWM) signal. A current sensor generates a current sense signal representing a current flowing from a supply voltage. The current sense signal is integrated to generate an integration signal. The integration signal is compared to a threshold, and the result of the comparison is used to adjust the duty cycle of the PWM signal. In this manner the disk drive draws essentially constant average input current from the supply voltage which decreases the spin up time of the disk.

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