WO1999031956A3 - Automated servo gain adjustment using fourier transform - Google Patents

Automated servo gain adjustment using fourier transform Download PDF

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Publication number
WO1999031956A3
WO1999031956A3 PCT/US1998/026828 US9826828W WO9931956A3 WO 1999031956 A3 WO1999031956 A3 WO 1999031956A3 US 9826828 W US9826828 W US 9826828W WO 9931956 A3 WO9931956 A3 WO 9931956A3
Authority
WO
WIPO (PCT)
Prior art keywords
servo loop
gain
loop gain
response
measured
Prior art date
Application number
PCT/US1998/026828
Other languages
French (fr)
Other versions
WO1999031956A2 (en
Inventor
Leonardus J Grassens
David L Schell
Original Assignee
Lsi Logic Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Lsi Logic Corp filed Critical Lsi Logic Corp
Publication of WO1999031956A2 publication Critical patent/WO1999031956A2/en
Publication of WO1999031956A3 publication Critical patent/WO1999031956A3/en

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Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G11B7/0941—Methods and circuits for servo gain or phase compensation during operation

Abstract

Servo loop gain is automatically adjusted for control loops of precision tracking and focusing servos in an optical or magneto optical storage device (114). To adjust servo loop gain during operation, the servo loop (100) is modelled as a series of simple gain components (KPA, KACT, KOPT, KPRE A, KADC, KC, KDAC), with the total servo loop gain being the product of the gain components. A controller gain components (KC) is adjusted based on measured servo loop gain to keep the total servo loop gain constant. To measure the servo loop gain during operation, a sinusoidal signal (104) is injected into the servo loop (100) by addition to the normal servo control signal for a period of n cycles of the sinusoidal signal. The servo loop (100) response is measured for the last n-1 cycles of this injection period, with the Fourier Transform excitation frequency component of the measured response being computed to determine the response amplitude. The servo loop gain may then be computed from measured response amplitude and the known amplitude of the injected signal (104). If the computed gain value is within a range of expected values, the controller gain (KC) is adjusted to keep the total servo loop gain constant. Otherwise, a default gain value is employed to adjust the servo loop gain. In an alternative embodiment, the servo loop gain excluding the controller gain component (KC) is determined from two measurements of the system response to the injected sine wave (104).
PCT/US1998/026828 1997-12-19 1998-12-16 Automated servo gain adjustment using fourier transform WO1999031956A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US99452597A 1997-12-19 1997-12-19
US08/994,525 1997-12-19

Publications (2)

Publication Number Publication Date
WO1999031956A2 WO1999031956A2 (en) 1999-07-01
WO1999031956A3 true WO1999031956A3 (en) 1999-11-11

Family

ID=25540757

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1998/026828 WO1999031956A2 (en) 1997-12-19 1998-12-16 Automated servo gain adjustment using fourier transform

Country Status (1)

Country Link
WO (1) WO1999031956A2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8937854B2 (en) 2001-01-25 2015-01-20 Optical Devices, Llc Servo processor receiving photodetector signals
RU2545384C2 (en) * 2008-12-18 2015-03-27 Конинклейке Филипс Электроникс Н.В. Active suppression of audio noise

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE60139468D1 (en) * 2000-04-20 2009-09-17 Yaskawa Denki Kitakyushu Kk ENGINE CONTROL
US7492675B2 (en) * 2001-01-25 2009-02-17 Dphi Acquisitions, Inc. Digital servo system with calibrated notch filters
KR100498455B1 (en) * 2002-11-07 2005-07-01 삼성전자주식회사 Apparatus and method for controllng loop gain of the servo system
KR101263817B1 (en) 2007-09-07 2013-05-13 삼성전자주식회사 control system insensitive to noise and control method
CN105093859B (en) * 2015-09-28 2017-05-31 黑龙江大学 A kind of work stage adaptive feedforward control method with force oscillation compensation
CN110460076A (en) * 2019-08-23 2019-11-15 南京国电南自电网自动化有限公司 The automatic checkout system and method for grid side energy storage Monitor Process control system

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4096425A (en) * 1974-09-19 1978-06-20 Ferranti Limited Servo systems
US4482989A (en) * 1981-11-26 1984-11-13 U.S. Philips Corporation Apparatus for optically scanning a disc-shaped record carrier
US4551776A (en) * 1982-12-20 1985-11-05 International Business Machines Corporation Automatic reference adjustment for position error signal on disk file servo system
US4827202A (en) * 1986-10-22 1989-05-02 Deutsche Thomson-Brandt Gmbh Method of and circuitry for automatically adjusting the variable-gain amplification in a control loop
US5121374A (en) * 1989-10-25 1992-06-09 Eastman Kodak Company Method for automatically compensating for the eccentricity in an optical head positioning servo-mechanism
US5339206A (en) * 1992-03-31 1994-08-16 Fujitsu Limited Positioning control method and apparatus of head which is used in magnetic disk apparatus
US5539714A (en) * 1991-09-25 1996-07-23 Integral Peripherals Adaptive runout compensation for miniature disk drives
US5550685A (en) * 1993-10-22 1996-08-27 Syquest Technology, Inc. Applying an adaptive feed-forward algorithm as a frequency selective filter in a closed loop disk drive servo system in order to compensate for periodic perturbations which otherwise appear in the servo system position error signal
US5576976A (en) * 1993-09-07 1996-11-19 Rockwell International Corporation Amplitude detection and automatic gain control of a sparsely sampled sinusoid by adjustment of a notch filter

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4096425A (en) * 1974-09-19 1978-06-20 Ferranti Limited Servo systems
US4482989A (en) * 1981-11-26 1984-11-13 U.S. Philips Corporation Apparatus for optically scanning a disc-shaped record carrier
US4551776A (en) * 1982-12-20 1985-11-05 International Business Machines Corporation Automatic reference adjustment for position error signal on disk file servo system
US4827202A (en) * 1986-10-22 1989-05-02 Deutsche Thomson-Brandt Gmbh Method of and circuitry for automatically adjusting the variable-gain amplification in a control loop
US5121374A (en) * 1989-10-25 1992-06-09 Eastman Kodak Company Method for automatically compensating for the eccentricity in an optical head positioning servo-mechanism
US5539714A (en) * 1991-09-25 1996-07-23 Integral Peripherals Adaptive runout compensation for miniature disk drives
US5339206A (en) * 1992-03-31 1994-08-16 Fujitsu Limited Positioning control method and apparatus of head which is used in magnetic disk apparatus
US5576976A (en) * 1993-09-07 1996-11-19 Rockwell International Corporation Amplitude detection and automatic gain control of a sparsely sampled sinusoid by adjustment of a notch filter
US5550685A (en) * 1993-10-22 1996-08-27 Syquest Technology, Inc. Applying an adaptive feed-forward algorithm as a frequency selective filter in a closed loop disk drive servo system in order to compensate for periodic perturbations which otherwise appear in the servo system position error signal

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8937854B2 (en) 2001-01-25 2015-01-20 Optical Devices, Llc Servo processor receiving photodetector signals
US9105281B2 (en) 2001-01-25 2015-08-11 Optical Devices, Llc Servo processor receiving photodetector signals
US9245569B1 (en) 2001-01-25 2016-01-26 Optical Devices, Llc Servo processor receiving photodetector signals
US9514777B2 (en) 2001-01-25 2016-12-06 Optical Devices, Llc Servo processor receiving photodetector signals
RU2545384C2 (en) * 2008-12-18 2015-03-27 Конинклейке Филипс Электроникс Н.В. Active suppression of audio noise

Also Published As

Publication number Publication date
WO1999031956A2 (en) 1999-07-01

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