| US 7,595,957 B2 | ||
| Servo gain adjustment based on bias force error | ||
| KeXiu Liu, Jesmond (Australia); JianGuo Zhou, Singapore (Singapore); MingZhong Ding, Singapore (Singapore); KianKeong Ooi, Singapore (Singapore); and WenJun Cao, Singapore (Singapore) | ||
| Assigned to Seagate Technology LLC, Scotts Valley, Calif. (US) | ||
| Filed on Jun. 29, 2007, as Appl. No. 11/771,363. | ||
| Prior Publication US 2009/0003146 A1, Jan. 01, 2009 | ||
| Int. Cl. G11B 5/596 (2006.01) | ||
| U.S. Cl. 360—78.09 [360/78.07] | 15 Claims |
| 1. An apparatus comprising:
a circuit that determines a bias force error between an estimated bias force and an actual bias force on an actuator during
movement by a servo motor, adjusts a servo gain in response to differences between an accumulated bias force error and an
accumulated position error between present and desired actuator locations as the circuit repetitively positions the actuator,
and regulates movement of the actuator by the servo motor in response to the servo gain.
|