United States Patent
US Patent 6747837: Disk drive comprising an integrator for…
US 6747837 · granted 2004-06-08
Abstract
A disk drive is disclosed comprising a voice coil motor (VCM) actuator and a piezoelectric (PZT) actuator. The VCM actuator is driven by a control effort including an integrator, and the PZT actuator is driven by a control effort including a transformer.
| Patent Number | 6747837 |
|---|---|
| Title | Disk drive comprising an integrator for controlling a VCM actuator and transformer for controlling a piezoelectric actuator |
| Filed | 2001-08-31 |
| Granted | 2004-06-08 |
| Inventor(s) | Bennett; George J. |
| Assignee | Western Digital Technologies, Inc. |
| CPC Classification | G11B 5/55 |
| Number of Claims | 31 |
Abstract
A disk drive is disclosed comprising a voice coil motor (VCM) actuator and a piezoelectric (PZT) actuator. The VCM actuator is driven by a control effort including an integrator, and the PZT actuator is driven by a control effort including a transformer.
Claim 1
A disk drive comprising: (a) a disk; (b) a head; (c) an actuator for actuating the head radially over the disk, the actuator comprising a voice coil motor (VCM) actuator and apiezoelectric (PZT) actuator; (d) a position error generator for generating a position error signal (PES) representing a difference between an actual position of the head and a desired position of the head; (e) a PZT controller comprising: a voltagegenerator for generating a first voltage in response to the PES; and a transformer comprising a primary winding and a secondary winding, the transformer for stepping up the first voltage to generate a second voltage greater than the first voltage, thesecond voltage applied to the PZT actuator; and (f) a VCM controller comprising an integrator for integrating the PES to generate a VCM control signal applied to the VCM actuator in order to force the average of the second voltage toward zero therebyminimizing the volt-second product of the transformer.
Claims
31 totalA disk drive comprising: (a) a disk; (b) a head; (c) an actuator for actuating the head radially over the disk, the actuator comprising a voice coil motor (VCM) actuator and apiezoelectric (PZT) actuator; (d) a position error generator for generating a position error signal (PES) representing a difference between an actual position of the head and a desired position of the head; (e) a PZT controller comprising: a voltagegenerator for generating a first voltage in response to the PES; and a transformer comprising a primary winding and a secondary winding, the transformer for stepping up the first voltage to generate a second voltage greater than the first voltage, thesecond voltage applied to the PZT actuator; and (f) a VCM controller comprising an integrator for integrating the PES to generate a VCM control signal applied to the VCM actuator in order to force the average of the second voltage toward zero therebyminimizing the volt-second product of the transformer.