Vibration control with thin-film-coil actuator for head-positioning system in hard disk drives
In a head-positioning system of hard disk drives, various mechanical resonances may degrade performance or stability of the control system. In these mechanical resonances, a torsional mode of a head-stack assembly (HSA), in which a resonant frequency is between 3 kHz and 4 kHz, has a large negative...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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The Japan Society of Mechanical Engineers
2015-03-01
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| Series: | Journal of Advanced Mechanical Design, Systems, and Manufacturing |
| Subjects: | |
| Online Access: | https://www.jstage.jst.go.jp/article/jamdsm/9/1/9_2015jamdsm0010/_pdf/-char/en |
| _version_ | 1811292321401012224 |
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| author | Takenori ATSUMI Kenji SUZUKI Shigeo NAKAMURA Mutsuro OHTA |
| author_facet | Takenori ATSUMI Kenji SUZUKI Shigeo NAKAMURA Mutsuro OHTA |
| author_sort | Takenori ATSUMI |
| collection | DOAJ |
| description | In a head-positioning system of hard disk drives, various mechanical resonances may degrade performance or stability of the control system. In these mechanical resonances, a torsional mode of a head-stack assembly (HSA), in which a resonant frequency is between 3 kHz and 4 kHz, has a large negative impact for the performance of hard disk drives because it can be easily excited by operational vibrations of other hard disk drives in a data-storage server. To overcome this issue, we have developed a vibration control method with a thin-film-coil actuator (called ”film actuator”) for the head-positioning control system of hard disk drives. The film actuator is attached to a coil of a Voice Coil Motor (VCM). This proposed control system is a triple-stage-actuator system: the first stage is a VCM actuator for moving the HSA, the second stage is a PZT actuator for moving a suspension in the HSA, and the third stage is the film actuator to control the torsional mode of the HSA. The proposed triple-stage actuator system can compensate for the vibrations of the torsional mode by using the film-actuator. Comparison of sensitivity functions showed that the triple-stage-actuator system can improve a sensitivity function at the torsional mode's frequency without decreasing a servo bandwidth of the control system. |
| first_indexed | 2024-04-13T04:43:41Z |
| format | Article |
| id | doaj.art-c624a14cf6054f04bd6879a835994651 |
| institution | Directory Open Access Journal |
| issn | 1881-3054 |
| language | English |
| last_indexed | 2024-04-13T04:43:41Z |
| publishDate | 2015-03-01 |
| publisher | The Japan Society of Mechanical Engineers |
| record_format | Article |
| series | Journal of Advanced Mechanical Design, Systems, and Manufacturing |
| spelling | doaj.art-c624a14cf6054f04bd6879a8359946512022-12-22T03:01:55ZengThe Japan Society of Mechanical EngineersJournal of Advanced Mechanical Design, Systems, and Manufacturing1881-30542015-03-0191JAMDSM0010JAMDSM001010.1299/jamdsm.2015jamdsm0010jamdsmVibration control with thin-film-coil actuator for head-positioning system in hard disk drivesTakenori ATSUMI0Kenji SUZUKI1Shigeo NAKAMURA2Mutsuro OHTA3Mechanical & Servo Development, HGST Japan, Ltd.Mechanical & Servo Development, HGST Japan, Ltd.Mechanical & Servo Development, HGST Japan, Ltd.Mechanical & Servo Development, HGST Japan, Ltd.In a head-positioning system of hard disk drives, various mechanical resonances may degrade performance or stability of the control system. In these mechanical resonances, a torsional mode of a head-stack assembly (HSA), in which a resonant frequency is between 3 kHz and 4 kHz, has a large negative impact for the performance of hard disk drives because it can be easily excited by operational vibrations of other hard disk drives in a data-storage server. To overcome this issue, we have developed a vibration control method with a thin-film-coil actuator (called ”film actuator”) for the head-positioning control system of hard disk drives. The film actuator is attached to a coil of a Voice Coil Motor (VCM). This proposed control system is a triple-stage-actuator system: the first stage is a VCM actuator for moving the HSA, the second stage is a PZT actuator for moving a suspension in the HSA, and the third stage is the film actuator to control the torsional mode of the HSA. The proposed triple-stage actuator system can compensate for the vibrations of the torsional mode by using the film-actuator. Comparison of sensitivity functions showed that the triple-stage-actuator system can improve a sensitivity function at the torsional mode's frequency without decreasing a servo bandwidth of the control system.https://www.jstage.jst.go.jp/article/jamdsm/9/1/9_2015jamdsm0010/_pdf/-char/enhard disk drivepositioning controlthin-film-coil actuatorvibration controlmechanical resonant mode |
| spellingShingle | Takenori ATSUMI Kenji SUZUKI Shigeo NAKAMURA Mutsuro OHTA Vibration control with thin-film-coil actuator for head-positioning system in hard disk drives Journal of Advanced Mechanical Design, Systems, and Manufacturing hard disk drive positioning control thin-film-coil actuator vibration control mechanical resonant mode |
| title | Vibration control with thin-film-coil actuator for head-positioning system in hard disk drives |
| title_full | Vibration control with thin-film-coil actuator for head-positioning system in hard disk drives |
| title_fullStr | Vibration control with thin-film-coil actuator for head-positioning system in hard disk drives |
| title_full_unstemmed | Vibration control with thin-film-coil actuator for head-positioning system in hard disk drives |
| title_short | Vibration control with thin-film-coil actuator for head-positioning system in hard disk drives |
| title_sort | vibration control with thin film coil actuator for head positioning system in hard disk drives |
| topic | hard disk drive positioning control thin-film-coil actuator vibration control mechanical resonant mode |
| url | https://www.jstage.jst.go.jp/article/jamdsm/9/1/9_2015jamdsm0010/_pdf/-char/en |
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