Electricity: motive power systems – Positional servo systems – Pulse-width modulated power input to motor
Reexamination Certificate
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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Bennett George J.
Ryan Robert P.
Fletcher Marlon T.
McCloud Renata
Sheerin, Esq. Howard H.
Western Digital Technologies Inc.
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