Loading patent…
AssigneeInternational Business Machines Corporation
InventorsKevin J. Erickson, Richard Greenberg, Douglas W. Nelson
Estimating the term…
A spindle motor control method and apparatus for spindle motor control are provided for use in a direct access storage device. A plurality of operational modes of the direct access storage device are detected. The operational modes of the direct access storage device include start-up and idle operational modes and predetermined critical operational modes that include reading of data and reading of servo information. A pulse width modulation (PWM) mode control for applying driving current to the spindle motor is provided responsive to detecting a start-up or an idle operational mode. A linear mode control for applying driving current to the spindle motor is provided responsive to detecting one of the predetermined critical operational modes. During operation of the disk file, a small percentage of the overall file power-on time is spent performing critical file operations so that substantial power savings are achieved by the PWM mode control. Also since the integrity of the data transferred is critical, the error rate reduction that results by operating in the linear mode during the critical file operations is advantageous.
A spindle motor control method for a direct access storage device including a multi-phase, brushless spindle motor and first and second half bridge power driver circuits;
Apparatus for spindle motor control comprising:
A disk file comprising:
Dependencies are inferred from the claim text.