Hard disk drive with voltage-driven voice coil motor and model-based control

Roberto Oboe, Federico Marcassa, Giuseppe Maiocchi

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

In this paper, we describe the voice coil model-based control (VCMC), a new solution for driving the voice coil motor (VCM) in hard disk drives (HDDs), in which the usual current driver for the VCM has been replaced by a voltage driver. The VCMC replicates the behavior of a current loop by using a model of the VCM and its driver, including the saturation of the power stage. Since VCM resistance may change by 30% during HDD operations, the model used by VCMC must be adapted accordingly, in order to achieve the same performance as the standard current driver. This paper presents a pair of online estimation procedures used to get the value of the VCM coil resistance during seek and track following, respectively. It will be shown that both procedures are quite accurate in estimating variations of VCM resistance and their output can be used to perform online tuning of the VCMC. Experimental results show that the servo performance with the adaptive VCMC is not affected by resistance variation and it is equivalent to that of the standard current driver.

Original languageEnglish
Pages (from-to)784-790
Number of pages7
JournalIEEE Transactions on Magnetics
Volume41
Issue number2
DOIs
Publication statusPublished - Feb 2005

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Hard disk storage
coils
Electric potential
electric potential
Tuning
estimating
tuning

Keywords

  • Hard disks
  • Identification
  • Voltage control

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Physics and Astronomy (miscellaneous)

Cite this

Hard disk drive with voltage-driven voice coil motor and model-based control. / Oboe, Roberto; Marcassa, Federico; Maiocchi, Giuseppe.

In: IEEE Transactions on Magnetics, Vol. 41, No. 2, 02.2005, p. 784-790.

Research output: Contribution to journalArticle

Oboe, Roberto ; Marcassa, Federico ; Maiocchi, Giuseppe. / Hard disk drive with voltage-driven voice coil motor and model-based control. In: IEEE Transactions on Magnetics. 2005 ; Vol. 41, No. 2. pp. 784-790.
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