Data storage devices such as disk drives comprise a disk and a head connected to a distal end of an actuator arm which is rotated about a pivot by a voice coil motor (VCM) to position the head radially over the disk. The disk comprises a plurality of radially spaced, concentric tracks for recording user data sectors and servo sectors. The servo sectors comprise head positioning information (e.g., a track address) which is read by the head and processed by a servo control system to control the actuator arm as it seeks from track to track.
As the density of the data tracks increases, a microactuator may be employed in combination with the VCM to improve the tracking performance of the servo system. Any suitable microactuator may be employed, such as a suitable piezoelectric (PZT) actuator. The microactuator may actuate the head over the disk in any suitable manner, such as by actuating a suspension relative to a distal end of an actuator arm, or by actuating a slider relative to the suspension.
where hj represents a slice of the Preisach plane and {circumflex over (b)}j is an update bit map based on at least part of the Preisach bit map bj. The current input ui and the current compensation value yi are combined to generate the control signal applied to the microactuator (block 32).
In the embodiment of
The hysteretic response 52 of the microactuator 16 may be modeled using a Preisach plane as shown in
The position of the microactuator ym(t) is the integration of its previous trajectory T(α, β) on the predefined weighted density plane with weight μ(α, β), multiplied by the hysteron operator {circumflex over (γ)}α,β[u(t)] defined as
Referring to the example shown in
where {circumflex over (b)}j is the update bit map based on at least part of the Preisach bit map bj as illustrated in
where {circumflex over (b)}j is the update bit map based on at least part of the Preisach bit map bj as illustrated in
Any suitable technique may be employed to measure the hysteretic response of the microactuator 16 and to generate the corresponding Preisach plane described above. In one embodiment, a sinusoid is injected into a control signal applied to the microactuator 16, and a sinusoidal response of the microactuator is measured. In one embodiment, slices of the Preisach plane are generated based on the measured sinusoidal response.
An example of this embodiment is understood with reference to the dual stage actuator (DSA) servo loop shown in
dm(t)=r sin(ωt)+φ
where r represents an amplitude and φ represents a DC offset of the sinusoid. The sinusoidal response of the microactuator ym(t) may be represented as:
ym(t)=K[dm(t)+{tilde over (H)}(dm(t))]
where K represents a gain of the microactuator, {tilde over (H)}(dm(t))=S−1H(dm(t)) represents a residue hysteretic response after static non-linear compensation 72 of the microactuator, and H(dm(t)) represents the original hysteretic response of the microactuator based on the past input history. In one embodiment, the hysteretic response of the microactuator may be estimated by computing a discrete Fourier transform (DFT) of the microactuator response Ym after injecting the above input sinusoid as:
Accordingly by injecting a sinusoid 68 into the control signal 70 and measuring the sinusoidal response of the microactuator, the hysteretic response of the microactuator may be estimated based on the above equation. In one embodiment, by varying the amplitude r (and optionally the offset φ) of the input sinusoid 68 the entire Preisach plane described above may be characterized.
In one embodiment, the Preisach plane may be symmetric meaning that the horizontal slices shown in
In one embodiment, the hysteretic response of the microactuator 16 may correspond to an asymmetric Preisach plane such that the horizontal and vertical slices shown in
Any suitable microactuator may be employed to actuate the head over the disk, such as a piezoelectric actuator. In addition, the microactuator may actuate the head over the disk in any suitable manner, such as by actuating a suspension relative to the actuator arm, or by actuating a head gimbal assembly (HGA) that couples a slider to the suspension.
Any suitable control circuitry may be employed to implement the flow diagrams in the above embodiments, such as any suitable integrated circuit or circuits. For example, the control circuitry may be implemented within a read channel integrated circuit, or in a component separate from the read channel, such as a disk controller, or certain operations described above may be performed by a read channel and others by a disk controller. In one embodiment, the read channel and disk controller are implemented as separate integrated circuits, and in an alternative embodiment they are fabricated into a single integrated circuit or system on a chip (SOC). In addition, the control circuitry may include a suitable preamp circuit implemented as a separate integrated circuit, integrated into the read channel or disk controller circuit, or integrated into a SOC.
In one embodiment, the control circuitry comprises a microprocessor executing instructions, the instructions being operable to cause the microprocessor to perform the flow diagrams described herein. The instructions may be stored in any computer-readable medium. In one embodiment, they may be stored on a non-volatile semiconductor memory external to the microprocessor, or integrated with the microprocessor in a SOC. In another embodiment, the instructions are stored on the disk and read into a volatile semiconductor memory when the disk drive is powered on. In yet another embodiment, the control circuitry comprises suitable logic circuitry, such as state machine circuitry.
In various embodiments, a disk drive may include a magnetic disk drive, an optical disk drive, etc. In addition, while the above examples concern a disk drive, the various embodiments are not limited to a disk drive and can be applied to other data storage devices and systems, such as magnetic tape drives, solid state drives, hybrid drives, etc. In addition, some embodiments may include electronic devices such as computing devices, data server devices, media content storage devices, etc. that comprise the storage media and/or control circuitry as described above.
The various features and processes described above may be used independently of one another, or may be combined in various ways. All possible combinations and subcombinations are intended to fall within the scope of this disclosure. In addition, certain method, event or process blocks may be omitted in some implementations. The methods and processes described herein are also not limited to any particular sequence, and the blocks or states relating thereto can be performed in other sequences that are appropriate. For example, described tasks or events may be performed in an order other than that specifically disclosed, or multiple may be combined in a single block or state. The example tasks or events may be performed in serial, in parallel, or in some other manner. Tasks or events may be added to or removed from the disclosed example embodiments. The example systems and components described herein may be configured differently than described. For example, elements may be added to, removed from, or rearranged compared to the disclosed example embodiments.
While certain example embodiments have been described, these embodiments have been presented by way of example only, and are not intended to limit the scope of the inventions disclosed herein. Thus, nothing in the foregoing description is intended to imply that any particular feature, characteristic, step, module, or block is necessary or indispensable. Indeed, the novel methods and systems described herein may be embodied in a variety of other forms; furthermore, various omissions, substitutions and changes in the form of the methods and systems described herein may be made without departing from the spirit of the embodiments disclosed herein.
Number | Name | Date | Kind |
---|---|---|---|
2728222 | Becker et al. | Dec 1955 | A |
4760358 | Inoue | Jul 1988 | A |
5118982 | Inoue et al. | Jun 1992 | A |
5262643 | Hammond et al. | Nov 1993 | A |
5301558 | Livingston et al. | Apr 1994 | A |
5447051 | Hanks et al. | Sep 1995 | A |
5491682 | Dohmeier et al. | Feb 1996 | A |
5657188 | Jurgenson et al. | Aug 1997 | A |
5852524 | Glover et al. | Dec 1998 | A |
6014283 | Codilian et al. | Jan 2000 | A |
6052076 | Patton, III et al. | Apr 2000 | A |
6052250 | Golowka et al. | Apr 2000 | A |
6067206 | Hull et al. | May 2000 | A |
6078453 | Dziallo et al. | Jun 2000 | A |
6088187 | Takaishi | Jul 2000 | A |
6091564 | Codilian et al. | Jul 2000 | A |
6094020 | Goretzki et al. | Jul 2000 | A |
6094973 | Novotny | Aug 2000 | A |
6101058 | Morris | Aug 2000 | A |
6101065 | Alfred et al. | Aug 2000 | A |
6104153 | Codilian et al. | Aug 2000 | A |
6122133 | Nazarian et al. | Sep 2000 | A |
6122135 | Stich | Sep 2000 | A |
6141175 | Nazarian et al. | Oct 2000 | A |
6160368 | Plutowski | Dec 2000 | A |
6160676 | Takaishi | Dec 2000 | A |
6163434 | Zhang | Dec 2000 | A |
RE37030 | Lloyd et al. | Jan 2001 | E |
6181502 | Hussein et al. | Jan 2001 | B1 |
6195222 | Heminger et al. | Feb 2001 | B1 |
6198584 | Codilian et al. | Mar 2001 | B1 |
6198590 | Codilian et al. | Mar 2001 | B1 |
6204988 | Codilian et al. | Mar 2001 | B1 |
6211638 | Heaton et al. | Apr 2001 | B1 |
6243223 | Elliott et al. | Jun 2001 | B1 |
6249890 | Ukani et al. | Jun 2001 | B1 |
6263251 | Rutschmann | Jul 2001 | B1 |
6281652 | Ryan et al. | Aug 2001 | B1 |
6285521 | Hussein | Sep 2001 | B1 |
6292320 | Mason et al. | Sep 2001 | B1 |
6310742 | Nazarian et al. | Oct 2001 | B1 |
6320718 | Bouwkamp et al. | Nov 2001 | B1 |
6342984 | Hussein et al. | Jan 2002 | B1 |
6347018 | Kadlec et al. | Feb 2002 | B1 |
6369971 | Everett | Apr 2002 | B1 |
6369972 | Codilian et al. | Apr 2002 | B1 |
6369974 | Asgari et al. | Apr 2002 | B1 |
6462896 | Codilian et al. | Oct 2002 | B1 |
6476996 | Ryan | Nov 2002 | B1 |
6484577 | Bennett | Nov 2002 | B1 |
6493169 | Ferris et al. | Dec 2002 | B1 |
6493177 | Ell et al. | Dec 2002 | B1 |
6496324 | Golowka et al. | Dec 2002 | B1 |
6498698 | Golowka et al. | Dec 2002 | B1 |
6501606 | Boutaghou et al. | Dec 2002 | B2 |
6507450 | Elliott | Jan 2003 | B1 |
6510752 | Sacks et al. | Jan 2003 | B1 |
6534936 | Messenger et al. | Mar 2003 | B2 |
6538839 | Ryan | Mar 2003 | B1 |
6545835 | Codilian et al. | Apr 2003 | B1 |
6546296 | Hara | Apr 2003 | B1 |
6549359 | Bennett et al. | Apr 2003 | B1 |
6549361 | Bennett et al. | Apr 2003 | B1 |
6556028 | Umanskiy et al. | Apr 2003 | B1 |
6556933 | Sacks et al. | Apr 2003 | B1 |
6560056 | Ryan | May 2003 | B1 |
6563665 | Ell | May 2003 | B1 |
6568268 | Bennett | May 2003 | B1 |
6574062 | Bennett et al. | Jun 2003 | B1 |
6577465 | Bennett et al. | Jun 2003 | B1 |
6614615 | Ju et al. | Sep 2003 | B1 |
6614618 | Sheh et al. | Sep 2003 | B1 |
6636377 | Yu et al. | Oct 2003 | B1 |
6639411 | Thomsen | Oct 2003 | B1 |
6690536 | Ryan | Feb 2004 | B1 |
6693764 | Sheh et al. | Feb 2004 | B1 |
6707633 | Okuyama et al. | Mar 2004 | B2 |
6707635 | Codilian et al. | Mar 2004 | B1 |
6710953 | Vallis et al. | Mar 2004 | B1 |
6710966 | Codilian et al. | Mar 2004 | B1 |
6714371 | Codilian | Mar 2004 | B1 |
6714372 | Codilian et al. | Mar 2004 | B1 |
6724563 | Kobayashi et al. | Apr 2004 | B2 |
6724564 | Codilian et al. | Apr 2004 | B1 |
6731450 | Codilian et al. | May 2004 | B1 |
6735041 | Codilian et al. | May 2004 | B1 |
6738220 | Codilian | May 2004 | B1 |
6741417 | Hsin et al. | May 2004 | B2 |
6747837 | Bennett | Jun 2004 | B1 |
6760186 | Codilian et al. | Jul 2004 | B1 |
6788483 | Ferris et al. | Sep 2004 | B1 |
6791785 | Messenger et al. | Sep 2004 | B1 |
6795268 | Ryan | Sep 2004 | B1 |
6819518 | Melkote et al. | Nov 2004 | B1 |
6826006 | Melkote et al. | Nov 2004 | B1 |
6826007 | Patton, III | Nov 2004 | B1 |
6831807 | Koso et al. | Dec 2004 | B2 |
6847502 | Codilian | Jan 2005 | B1 |
6850383 | Bennett | Feb 2005 | B1 |
6850384 | Bennett | Feb 2005 | B1 |
6861854 | Guo et al. | Mar 2005 | B1 |
6867944 | Ryan | Mar 2005 | B1 |
6870377 | Thomsen | Mar 2005 | B2 |
6876508 | Patton, III et al. | Apr 2005 | B1 |
6882496 | Codilian et al. | Apr 2005 | B1 |
6885514 | Codilian et al. | Apr 2005 | B1 |
6888694 | Guo et al. | May 2005 | B2 |
6895547 | Eleftheriou et al. | May 2005 | B2 |
6898039 | Kobayashi et al. | May 2005 | B2 |
6900958 | Yi et al. | May 2005 | B1 |
6900959 | Gardner et al. | May 2005 | B1 |
6903897 | Wang et al. | Jun 2005 | B1 |
6914740 | Tu et al. | Jul 2005 | B1 |
6914743 | Narayana et al. | Jul 2005 | B1 |
6920004 | Codilian et al. | Jul 2005 | B1 |
6924959 | Melkote et al. | Aug 2005 | B1 |
6924960 | Melkote et al. | Aug 2005 | B1 |
6924961 | Melkote et al. | Aug 2005 | B1 |
6934114 | Codilian et al. | Aug 2005 | B1 |
6934117 | Huang et al. | Aug 2005 | B2 |
6934135 | Ryan | Aug 2005 | B1 |
6937420 | McNab et al. | Aug 2005 | B1 |
6937423 | Ngo et al. | Aug 2005 | B1 |
6952322 | Codilian et al. | Oct 2005 | B1 |
6954324 | Tu et al. | Oct 2005 | B1 |
6956711 | Hanson et al. | Oct 2005 | B2 |
6958881 | Codilian et al. | Oct 2005 | B1 |
6963465 | Melkote et al. | Nov 2005 | B1 |
6965488 | Bennett | Nov 2005 | B1 |
6967458 | Bennett et al. | Nov 2005 | B1 |
6967811 | Codilian et al. | Nov 2005 | B1 |
6970319 | Bennett et al. | Nov 2005 | B1 |
6972539 | Codilian et al. | Dec 2005 | B1 |
6972540 | Wang et al. | Dec 2005 | B1 |
6972922 | Subrahmanyam et al. | Dec 2005 | B1 |
6975123 | Malang et al. | Dec 2005 | B1 |
6975477 | Hu et al. | Dec 2005 | B1 |
6975480 | Codilian et al. | Dec 2005 | B1 |
6977789 | Cloke | Dec 2005 | B1 |
6977793 | White et al. | Dec 2005 | B2 |
6980389 | Kupferman | Dec 2005 | B1 |
6987636 | Chue et al. | Jan 2006 | B1 |
6987639 | Yu | Jan 2006 | B1 |
6989954 | Lee et al. | Jan 2006 | B1 |
6992848 | Agarwal et al. | Jan 2006 | B1 |
6992851 | Cloke | Jan 2006 | B1 |
6992852 | Ying et al. | Jan 2006 | B1 |
6995941 | Miyamura et al. | Feb 2006 | B1 |
6999263 | Melkote et al. | Feb 2006 | B1 |
6999267 | Melkote et al. | Feb 2006 | B1 |
7006320 | Bennett et al. | Feb 2006 | B1 |
7009804 | Sharma et al. | Mar 2006 | B2 |
7016134 | Agarwal et al. | Mar 2006 | B1 |
7019938 | Miyata et al. | Mar 2006 | B2 |
7023637 | Kupferman | Apr 2006 | B1 |
7023640 | Codilian et al. | Apr 2006 | B1 |
7027256 | Subrahmanyam et al. | Apr 2006 | B1 |
7027257 | Kupferman | Apr 2006 | B1 |
7035026 | Codilian et al. | Apr 2006 | B2 |
7046472 | Melkote et al. | May 2006 | B1 |
7050249 | Chue et al. | May 2006 | B1 |
7050254 | Yu et al. | May 2006 | B1 |
7050258 | Codilian | May 2006 | B1 |
7054098 | Yu et al. | May 2006 | B1 |
7061714 | Yu | Jun 2006 | B1 |
7062698 | Yang | Jun 2006 | B2 |
7064918 | Codilian et al. | Jun 2006 | B1 |
7068451 | Wang et al. | Jun 2006 | B1 |
7068459 | Cloke et al. | Jun 2006 | B1 |
7068461 | Chue et al. | Jun 2006 | B1 |
7068463 | Ji et al. | Jun 2006 | B1 |
7072134 | Hirano et al. | Jul 2006 | B1 |
7072417 | Burd et al. | Jul 2006 | B1 |
7075748 | White et al. | Jul 2006 | B2 |
7079338 | Semba et al. | Jul 2006 | B1 |
7079339 | Semba et al. | Jul 2006 | B1 |
7088547 | Wang et al. | Aug 2006 | B1 |
7095579 | Ryan et al. | Aug 2006 | B1 |
7106552 | Hirano et al. | Sep 2006 | B2 |
7110208 | Miyamura et al. | Sep 2006 | B1 |
7110214 | Tu et al. | Sep 2006 | B1 |
7113362 | Lee et al. | Sep 2006 | B1 |
7113365 | Ryan et al. | Sep 2006 | B1 |
7116505 | Kupferman | Oct 2006 | B1 |
7124654 | Davies et al. | Oct 2006 | B1 |
7126781 | Bennett | Oct 2006 | B1 |
7136257 | Zhang et al. | Nov 2006 | B2 |
7158329 | Ryan | Jan 2007 | B1 |
7173790 | Kobayashi et al. | Feb 2007 | B2 |
7180703 | Subrahmanyam et al. | Feb 2007 | B1 |
7184230 | Chue et al. | Feb 2007 | B1 |
7196864 | Yi et al. | Mar 2007 | B1 |
7199966 | Tu et al. | Apr 2007 | B1 |
7203021 | Ryan et al. | Apr 2007 | B1 |
7209321 | Bennett | Apr 2007 | B1 |
7212364 | Lee | May 2007 | B1 |
7212374 | Wang et al | May 2007 | B1 |
7215504 | Bennett | May 2007 | B1 |
7218029 | Murphy | May 2007 | B2 |
7224546 | Orakcilar et al. | May 2007 | B1 |
7248426 | Weerasooriya et al. | Jul 2007 | B1 |
7250738 | Ting et al. | Jul 2007 | B1 |
7251098 | Wang et al. | Jul 2007 | B1 |
7253582 | Ding et al. | Aug 2007 | B1 |
7253989 | Lau et al. | Aug 2007 | B1 |
7265933 | Phan et al. | Sep 2007 | B1 |
7265936 | Lee et al. | Sep 2007 | B1 |
7283321 | Sun et al. | Oct 2007 | B1 |
7289288 | Tu | Oct 2007 | B1 |
7298574 | Melkote et al. | Nov 2007 | B1 |
7301717 | Lee et al. | Nov 2007 | B1 |
7304819 | Melkote et al. | Dec 2007 | B1 |
7330019 | Bennett | Feb 2008 | B1 |
7330327 | Chue et al. | Feb 2008 | B1 |
7333280 | Lifchits et al. | Feb 2008 | B1 |
7333290 | Kupferman | Feb 2008 | B1 |
7336434 | Lille et al. | Feb 2008 | B2 |
7339761 | Tu et al. | Mar 2008 | B1 |
7342740 | Lee et al. | Mar 2008 | B1 |
7346832 | Richardson et al. | Mar 2008 | B2 |
7365932 | Bennett | Apr 2008 | B1 |
7385780 | Kim et al. | Jun 2008 | B2 |
7388728 | Chen et al. | Jun 2008 | B1 |
7391583 | Sheh et al. | Jun 2008 | B1 |
7391584 | Sheh et al. | Jun 2008 | B1 |
7392687 | Huang et al. | Jul 2008 | B2 |
7395490 | Richardson et al. | Jul 2008 | B2 |
7423837 | Hutsell | Sep 2008 | B2 |
7433143 | Ying et al. | Oct 2008 | B1 |
7440210 | Lee | Oct 2008 | B1 |
7440225 | Chen et al. | Oct 2008 | B1 |
7450334 | Wang et al. | Nov 2008 | B1 |
7450336 | Wang et al. | Nov 2008 | B1 |
7453661 | Jang et al. | Nov 2008 | B1 |
7457071 | Sheh | Nov 2008 | B1 |
7466509 | Chen et al. | Dec 2008 | B1 |
7468855 | Weerasooriya et al. | Dec 2008 | B1 |
7474496 | Sun et al. | Jan 2009 | B1 |
7477471 | Nemshick et al. | Jan 2009 | B1 |
7480116 | Bennett | Jan 2009 | B1 |
7489464 | McNab et al. | Feb 2009 | B1 |
7492546 | Miyamura | Feb 2009 | B1 |
7495857 | Bennett | Feb 2009 | B1 |
7499236 | Lee et al. | Mar 2009 | B1 |
7502192 | Wang et al. | Mar 2009 | B1 |
7502195 | Wu et al. | Mar 2009 | B1 |
7502197 | Chue | Mar 2009 | B1 |
7505223 | McCornack | Mar 2009 | B1 |
7538971 | Sun et al. | May 2009 | B2 |
7542225 | Ding et al. | Jun 2009 | B1 |
7548392 | Desai et al. | Jun 2009 | B1 |
7551390 | Wang et al. | Jun 2009 | B1 |
7558016 | Le et al. | Jul 2009 | B1 |
7573670 | Ryan et al. | Aug 2009 | B1 |
7576940 | Lee et al. | Aug 2009 | B2 |
7576941 | Chen et al. | Aug 2009 | B1 |
7580212 | Li et al. | Aug 2009 | B1 |
7583470 | Chen et al. | Sep 2009 | B1 |
7595954 | Chen et al. | Sep 2009 | B1 |
7602575 | Lifchits et al. | Oct 2009 | B1 |
7616399 | Chen et al. | Nov 2009 | B1 |
7619844 | Bennett | Nov 2009 | B1 |
7626782 | Yu et al. | Dec 2009 | B1 |
7630162 | Zhao et al. | Dec 2009 | B2 |
7639447 | Yu et al. | Dec 2009 | B1 |
7656604 | Liang et al. | Feb 2010 | B1 |
7656607 | Bennett | Feb 2010 | B1 |
7657816 | Cohen et al. | Feb 2010 | B2 |
7660067 | Ji et al. | Feb 2010 | B1 |
7663835 | Yu et al. | Feb 2010 | B1 |
7675707 | Liu et al. | Mar 2010 | B1 |
7679854 | Narayana et al. | Mar 2010 | B1 |
7688534 | McCornack | Mar 2010 | B1 |
7688538 | Chen et al. | Mar 2010 | B1 |
7688539 | Bryant et al. | Mar 2010 | B1 |
7697233 | Bennett et al. | Apr 2010 | B1 |
7701661 | Bennett | Apr 2010 | B1 |
7710676 | Chue | May 2010 | B1 |
7715138 | Kupferman | May 2010 | B1 |
7729079 | Huber | Jun 2010 | B1 |
7733189 | Bennett | Jun 2010 | B1 |
7746592 | Liang et al. | Jun 2010 | B1 |
7746594 | Guo et al. | Jun 2010 | B1 |
7746595 | Guo et al. | Jun 2010 | B1 |
7760461 | Bennett | Jul 2010 | B1 |
7768276 | Yao | Aug 2010 | B2 |
7800853 | Guo et al. | Sep 2010 | B1 |
7800856 | Bennett et al. | Sep 2010 | B1 |
7800857 | Calaway et al. | Sep 2010 | B1 |
7814393 | Kyung et al. | Oct 2010 | B2 |
7826170 | Semba | Nov 2010 | B2 |
7839591 | Weerasooriya et al. | Nov 2010 | B1 |
7839595 | Chue et al. | Nov 2010 | B1 |
7839600 | Babinski et al. | Nov 2010 | B1 |
7843662 | Weerasooriya et al. | Nov 2010 | B1 |
7852588 | Ferris et al. | Dec 2010 | B1 |
7852592 | Liang et al. | Dec 2010 | B1 |
7864481 | Kon et al. | Jan 2011 | B1 |
7864482 | Babinski et al. | Jan 2011 | B1 |
7869155 | Wong | Jan 2011 | B1 |
7869157 | Nagashima et al. | Jan 2011 | B2 |
7876522 | Calaway et al. | Jan 2011 | B1 |
7876523 | Panyavoravaj et al. | Jan 2011 | B1 |
7913149 | Gribok et al. | Mar 2011 | B2 |
7916415 | Chue | Mar 2011 | B1 |
7916416 | Guo et al. | Mar 2011 | B1 |
7916420 | McFadyen et al. | Mar 2011 | B1 |
7916422 | Guo et al. | Mar 2011 | B1 |
7929238 | Vasquez | Apr 2011 | B1 |
7940490 | Shelor | May 2011 | B2 |
7961422 | Chen et al. | Jun 2011 | B1 |
8000053 | Anderson | Aug 2011 | B1 |
8031423 | Tsai et al. | Oct 2011 | B1 |
8054022 | Ryan et al. | Nov 2011 | B1 |
8059357 | Knigge et al. | Nov 2011 | B1 |
8059360 | Melkote et al. | Nov 2011 | B1 |
8072703 | Calaway et al. | Dec 2011 | B1 |
8077428 | Chen et al. | Dec 2011 | B1 |
8078901 | Meyer et al. | Dec 2011 | B1 |
8081395 | Ferris | Dec 2011 | B1 |
8085020 | Bennett | Dec 2011 | B1 |
8116023 | Kupferman | Feb 2012 | B1 |
8145934 | Ferris et al. | Mar 2012 | B1 |
8179626 | Ryan et al. | May 2012 | B1 |
8189286 | Chen et al. | May 2012 | B1 |
8213106 | Guo et al. | Jul 2012 | B1 |
8254222 | Tang | Aug 2012 | B1 |
8300348 | Liu et al. | Oct 2012 | B1 |
8315005 | Zou et al. | Nov 2012 | B1 |
8320069 | Knigge et al. | Nov 2012 | B1 |
8322235 | Keopuang et al. | Dec 2012 | B1 |
8335049 | Liu et al. | Dec 2012 | B1 |
8351174 | Gardner et al. | Jan 2013 | B1 |
8358114 | Ferris et al. | Jan 2013 | B1 |
8358145 | Ferris et al. | Jan 2013 | B1 |
8390367 | Bennett | Mar 2013 | B1 |
8432031 | Agness et al. | Apr 2013 | B1 |
8432629 | Rigney et al. | Apr 2013 | B1 |
8451697 | Rigney et al. | May 2013 | B1 |
8467144 | Lim et al. | Jun 2013 | B2 |
8482873 | Chue et al. | Jul 2013 | B1 |
8498076 | Sheh et al. | Jul 2013 | B1 |
8498172 | Patton, III et al. | Jul 2013 | B1 |
8508881 | Babinski et al. | Aug 2013 | B1 |
8531792 | Burd et al. | Sep 2013 | B1 |
8531798 | Xi et al. | Sep 2013 | B1 |
8537486 | Liang et al. | Sep 2013 | B2 |
8542455 | Huang et al. | Sep 2013 | B2 |
8547657 | Liu et al. | Oct 2013 | B1 |
8553351 | Narayana et al. | Oct 2013 | B1 |
8564899 | Lou et al. | Oct 2013 | B2 |
8576506 | Wang et al. | Nov 2013 | B1 |
8605382 | Mallary et al. | Dec 2013 | B1 |
8605383 | Wang et al. | Dec 2013 | B1 |
8605384 | Liu et al. | Dec 2013 | B1 |
8610391 | Yang et al. | Dec 2013 | B1 |
8611040 | Xi et al. | Dec 2013 | B1 |
8619385 | Guo et al. | Dec 2013 | B1 |
8630054 | Bennett et al. | Jan 2014 | B2 |
8630059 | Chen et al. | Jan 2014 | B1 |
8634154 | Rigney et al. | Jan 2014 | B1 |
8634283 | Rigney et al. | Jan 2014 | B1 |
8643976 | Wang et al. | Feb 2014 | B1 |
8649121 | Smith et al. | Feb 2014 | B1 |
8654466 | McFadyen | Feb 2014 | B1 |
8654467 | Wong et al. | Feb 2014 | B1 |
8665546 | Zhao et al. | Mar 2014 | B1 |
8665551 | Rigney et al. | Mar 2014 | B1 |
8670206 | Liang et al. | Mar 2014 | B1 |
8687312 | Liang | Apr 2014 | B1 |
8693123 | Guo et al. | Apr 2014 | B1 |
8693134 | Xi et al. | Apr 2014 | B1 |
8699173 | Kang et al. | Apr 2014 | B1 |
8711027 | Bennett | Apr 2014 | B1 |
8717696 | Ryan et al. | May 2014 | B1 |
8717699 | Ferris | May 2014 | B1 |
8717704 | Yu et al. | May 2014 | B1 |
8724245 | Smith et al. | May 2014 | B1 |
8724253 | Liang et al. | May 2014 | B1 |
8724254 | Tang et al. | May 2014 | B1 |
8724524 | Urabe et al. | May 2014 | B2 |
8737008 | Watanabe et al. | May 2014 | B1 |
8737013 | Zhou et al. | May 2014 | B2 |
8743495 | Chen et al. | Jun 2014 | B1 |
8743503 | Tang et al. | Jun 2014 | B1 |
8743504 | Bryant et al. | Jun 2014 | B1 |
8749904 | Liang et al. | Jun 2014 | B1 |
8760796 | Lou et al. | Jun 2014 | B1 |
8767332 | Chahwan et al. | Jul 2014 | B1 |
8767343 | Helmick et al. | Jul 2014 | B1 |
8767354 | Ferris et al. | Jul 2014 | B1 |
8773787 | Beker | Jul 2014 | B1 |
8779574 | Agness et al. | Jul 2014 | B1 |
8780473 | Zhao et al. | Jul 2014 | B1 |
8780477 | Guo et al. | Jul 2014 | B1 |
8780479 | Helmick et al. | Jul 2014 | B1 |
8780489 | Gayaka et al. | Jul 2014 | B1 |
8792202 | Wan et al. | Jul 2014 | B1 |
8797664 | Guo et al. | Aug 2014 | B1 |
8804267 | Huang et al. | Aug 2014 | B2 |
8824081 | Guo et al. | Sep 2014 | B1 |
8824262 | Liu et al. | Sep 2014 | B1 |
20010036034 | Chang et al. | Nov 2001 | A1 |
20020096969 | Murphy | Jul 2002 | A1 |
20020176201 | Hsin et al. | Nov 2002 | A1 |
20030030937 | Kohso et al. | Feb 2003 | A1 |
20030037298 | Eleftheriou et al. | Feb 2003 | A1 |
20030065992 | Yang | Apr 2003 | A1 |
20030076121 | Guo et al. | Apr 2003 | A1 |
20040004781 | Kobayashi et al. | Jan 2004 | A1 |
20040098659 | Bjerke et al. | May 2004 | A1 |
20040228027 | Zhang et al. | Nov 2004 | A1 |
20050146807 | Huang et al. | Jul 2005 | A1 |
20050204253 | Sukhobok et al. | Sep 2005 | A1 |
20050216821 | Harada | Sep 2005 | A1 |
20050246617 | Kyung et al. | Nov 2005 | A1 |
20060036925 | Kyung et al. | Feb 2006 | A1 |
20060036933 | Blankenship et al. | Feb 2006 | A1 |
20060171062 | Hirano et al. | Aug 2006 | A1 |
20070223136 | Hutsell | Sep 2007 | A1 |
20080129305 | Perryman et al. | Jun 2008 | A1 |
20080165444 | Zafer | Jul 2008 | A1 |
20080310046 | Menegoli et al. | Dec 2008 | A1 |
20090249159 | Lee et al. | Oct 2009 | A1 |
20090303839 | Narayanan et al. | Dec 2009 | A1 |
20090310250 | Nagashima et al. | Dec 2009 | A1 |
20100035085 | Jung et al. | Feb 2010 | A1 |
20100037674 | Yashchuk et al. | Feb 2010 | A1 |
20100100788 | Yang et al. | Apr 2010 | A1 |
20100238588 | Drouin et al. | Sep 2010 | A1 |
20110216437 | Mathur et al. | Sep 2011 | A1 |
20110299197 | Eguchi | Dec 2011 | A1 |
20120284493 | Lou et al. | Nov 2012 | A1 |
20130120870 | Zhou et al. | May 2013 | A1 |
20130148240 | Ferris et al. | Jun 2013 | A1 |
20130188277 | Matsuzawa | Jul 2013 | A1 |
Number | Date | Country |
---|---|---|
20940 | Feb 2007 | UA |
20943 | Feb 2007 | UA |
2009128546 | Oct 2009 | WO |
Entry |
---|
Model Order Hypothetical Verification of Discrete Preisach Plane: Theory and Atomic Force Microscope Experiment Results, Lei Miao et al, Proceedings of the 8th, World Congress on Intelligent Control and Automation, Jul. 6-9, 2010. |
Hysteresis Scaling by Defined Hysteron Pattern in Preisach Model, Teerawat Monnor et al, Proceedings of the World Congress on Engineering and Computer Science 2012, vol. II, Oct. 24-26, 2012. |
Clayton, G., et al., “A Review of Feedforward Control Approaches in Nanopositioning for High-Speed SPM,” Journal of Dynamic Systems, Measurement, and Control, www.asme.org., downloaded on Jan. 22, 2010, vol. 131, pp. 061101-1 to 061101-19, Oct. 28, 2009. |
Conway, R., et al., “Robust Track-Following Controller Design in Hard Disk Drives Based on Parameter Dependent Lyapunov Functions,” IEEE Transactions on Magnetics, Apr. 2010, vol. 46 (4), pp. 1060-1068. |
Franklin, G., et al., Digital Control Dynamic Systems, 1997, pp. 56-61. |
Gao, Z. , et al., “Discrete-Time Proportional and Integral Observer and Observer-Based Controller for Systems with Both Unknown Input and Output Disturbances,” Optimal Control Applications and Methods, 2008, vol. 29 (3), pp. 171-189. |
Ge, P., et al., “Tracking Control of a Piezoceramic Actuator,” IEEE Transactions on Control Systems Technology, vol. 4 (3), May 1996, pp. 209-216. |
Iyer, R., et al., “Control of Hysteretic Systems Through Inverse Compensation,” IEEE Control Systems Magazine, vol. 29 (1), Feb. 2009, pp. 83-99. |
Kim, Y., et al., “Servo Design for High-TPI Computer Disk Drives Using a Delayaccommodating State Estimator,” Microsystem Technologies, 2005, vol. 11 (8), pp. 696-701. |
Kobayshi, M., et al., “Adaptive Control of Dual-Stage Actuator for Hard Disk Drives,” Proceeding of the 2004 American Control Conference, Boston, Massachusetts, Jun. 30-Jul. 2, 2004. |
Krstic, M., et al., “Nonlinear and Adaptive Control Design,” New York: Wiley, 1995, pp. 388-393. |
Leiner, B., “LDPC Codes—a brief Tutorial,” Stud. ID: 53418L, Apr. 8, 2005, pp. 1-9. |
Song, G., et al., “Tracking Control of a Piezoceramic Actuator With Hysteresis Compensation Using Inverse Preisach Model,” IEEE/ASME Transactions on Mechatronics, vol. 10 (2), Apr. 2005, pp. 198-209. |
Tan, X., et al., “Adaptive Identification and Control of Hysteresis in Smart Materials,” IEEE Transactions on Automatic Control, vol. 50 (6), Jun. 2005, pp. 827,839. |
Tan, Y., et al., “Hysteresis Compensation of Piezoelectric Actuators in Dual-Stage Hard Disk Drives,” 8th Asian Control Conference (ASCC), May 15-18, 2011, pp. 1024-1029. |
Shreekant Gayaka, et al., U.S. Appl. No. 13/363,228, filed Jan. 31, 2012, 27 pages. |
Yanan Huang, et al., U.S. Appl. No. 13/720,832, filed Dec. 19, 2012, 24 pages. |
Shreekant Gayaka, et al., U.S. Appl. No. 13/923,024, filed Jun. 20, 2013, 19 pages. |
Alexander Babinski, et al., U.S. Appl. No. 12/606,819, filed Oct. 27, 2009, 24 pages. |