公开(公告)号：US20180061452A1

公开(公告)日：2018-03-01

申请号：US15247382

申请日：2016-08-25

Applicant: Seagate Technology LLC

Inventor： Qiang Bi ,  GuoQing Zhang ,  Kian Keong Ooi ,  MingZhong Ding ,  WenJun Cao

IPC: G11B20/14

CPC classification number: G11B5/596

Abstract: An apparatus includes a disk locked clock system and a feedforward microactuator compensator. The disk locked clock system is configured to estimate a timing error and generate a timing error signal. The feedforward microactuator compensator is configured to generate a microactuator compensation signal, without use of a vibration sensor signal, in response to the timing error signal.

公开(公告)号：US09858955B1

公开(公告)日：2018-01-02

申请号：US15231513

申请日：2016-08-08

Applicant: Seagate Technology LLC

Inventor： WenJun Cao ,  GuoQing Zhang ,  Xiang Lu ,  Qiang Bi ,  MingZhong Ding ,  Lou Supino

IPC: G11B5/09 ,  G11B5/55

CPC classification number: G11B5/5565 ,  G11B5/5526 ,  G11B5/5552

Abstract: An apparatus includes a microactuator controller configured to generate a microactuator control signal, a feedforward microactuator compensator configured to generate a microactuator compensation signal, and a microactuator model filter configured to filter a modified microactuator control signal. The microactuator compensation signal is configured to be injected into the microactuator control signal to generate the modified microactuator control signal. The microactuator model filter generates a filtered modified microactuator control signal and injects the filtered modified microactuator control signal into a position error signal to generate a modified position error signal.

公开(公告)号：US20240413768A1

公开(公告)日：2024-12-12

申请号：US18740661

申请日：2024-06-12

Applicant: Seagate Technology LLC

Inventor： WenJun Cao

IPC: H02N2/14 ,  G11B19/20

Abstract: A device includes a first set of switches and a second set of switches; a first filter and a second filter each comprising an unfiltered terminal and a filtered terminal; and a first piezoelectric element and a second piezoelectric element each comprising a first contact and a second contact. Turning on the first set of switches and turning off the second set of switches applies a first driving voltage to the first piezoelectric element and applies a second driving voltage to the second piezoelectric element.

公开(公告)号：US10090009B2

公开(公告)日：2018-10-02

申请号：US15247382

申请日：2016-08-25

Applicant: Seagate Technology LLC

Inventor： Qiang Bi ,  GuoQing Zhang ,  Kian Keong Ooi ,  MingZhong Ding ,  WenJun Cao

IPC: G11B5/09 ,  G11B5/48

Abstract: An apparatus includes a disk locked clock system and a feedforward microactuator compensator. The disk locked clock system is configured to estimate a timing error and generate a timing error signal. The feedforward microactuator compensator is configured to generate a microactuator compensation signal, without use of a vibration sensor signal, in response to the timing error signal.