Servo control system and method for a data storage device with improved braking
AssigneeSeagate Technology LLC
InventorPaul A. Galloway
Life of this patent
Estimating the term…
Abstract
A servo control system for a voice coil motor including a servo controller using position feedback to provide an acceleration current to the voice coil motor and voice coil brake providing a deceleration current based upon velocity feedback from the voice coil motor. In one embodiment, the velocity of the voice coil motor is derived from current feedback. A method for braking an actuator driven by a voice coil motor including the steps or receiving and processing current feedback from the voice coil motor and supplying a deceleration current to the voice coil motor derived from the current feedback from the voice coil motor.
Claims13
A servo control system for a voice coil motor comprising:
- servo feedback including head position feedback and current feedback from the voice coil motor;
- and
- a servo controller connected to receive and process the head position feedback to provide an acceleration current to the voice coil motor and to provide a deceleration current ib opposed to the direction of the acceleration current, based upon an integral of the current feedback from the voice coil motor.
A servo control system for a voice coil motor comprising:
- a servo controller for operating the voice coil motor for head placement;
- and
- means for braking the voice coil motor responsive to a loss of the head position feedback.
A servo control system for a voice coil motor comprising:
- servo feedback including head position feedback from the voice coil motor;
- and
- a servo controller connected to receive and process the head position feedback to provide an acceleration current to the voice coil motor and connected to receive and process velocity feedback vm from an accelerometer coupled to an actuator block driven by the voice coil motor to provide a deceleration current ib to the voice coil motor opposed to the direction of the acceleration current derived from the velocity feedback vm from the accelerometer coupled to the actuator block driven by the voice coil motor.
A method for operating a voice coil motor comprising steps of:
- a) providing an acceleration current to the voice coil motor to operate the voice coil motor for head placement;
- b) providing current feedback im from the voice coil motor;
- c) processing the current feedback im to derive a deceleration current ib;
- and
- d) applying the deceleration current ib to the voice coil motor to brake the voice coil motor.
Dependencies are inferred from the claim text.