Speed control of actuator arm and spindle in a data storage device
AssigneeWestern Digital Technologies, Inc.
InventorTriet Tieu
Life of this patent
Estimating the term…
Abstract
A data storage device comprises a disk; a spindle on which the disk is mounted; a spindle motor that rotates the spindle; an actuator arm configured with a recording head; and an actuator that rotates the actuator arm about a pivot to move the actuator arm radially across a disk surface. Control circuitry controls the actuator to move the actuator arm across the disk surface while simultaneously applying an active brake to decelerate the spindle by controlling a driver voltage to be out of phase with a back electromotive force (BEMF) voltage of the spindle motor.
Claims17
A data storage device comprising:
- a disk;
- a spindle on which the disk is mounted;
- a spindle motor configured to rotate the spindle;
- an actuator arm configured with a recording head;
- an actuator configured to rotate the actuator arm about a pivot to move the actuator arm radially across a surface of the disk;
- and
- control circuitry configured to:
- control the actuator to move the actuator arm across the disk surface while simultaneously applying an active brake to decelerate the spindle by controlling a driver voltage of the spindle motor to be out of phase relative to a back electromotive force (BEMF) voltage of the spindle motor;
- and
- increase a deceleration rate of the spindle by controlling the driver voltage of the spindle motor to be less than the BEMF voltage of the spindle motor.
Control circuitry for controlling an actuator arm and a spindle of a data storage device, comprising:
- an arm control circuit configured to control an actuator to move the actuator arm across a disk surface;
- and
- a spindle control circuit configured to:
- simultaneously with the arm control circuit controlling the actuator to move the actuator arm across the disk surface, apply an active brake to decelerate the spindle by controlling a driver voltage of a spindle motor to be out of phase relative to a back electromotive force (BEMF) voltage of the spindle motor;
- and
- increase a deceleration rate of the spindle by controlling the driver voltage of the spindle motor to be less than the BEMF voltage of the spindle motor.
A method for controlling an actuator arm and a spindle of a data storage device, the method comprising:
- controlling an actuator to move the actuator arm across a disk surface;
- simultaneously with moving the actuator arm across the disk surface, applying an active brake to decelerate the spindle by controlling a driver voltage of a spindle motor to be out of phase relative to a BEMF voltage of the spindle motor;
- and
- increasing a deceleration rate of the spindle by controlling the driver voltage of the spindle motor to be less than the BEMF voltage of the spindle motor.
Dependencies are inferred from the claim text.