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Disk resonance due to electro-magnetic excitation

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Abstract

Disk vibration is a substantial contributor to the Track-Mis-Registration error budget for the high rpm disk drive applications (10k, 15k rpm) because of high air turbulence. Measures are taken to reduce disk vibration such as to add stator between disks, build shroud around the disk stack to direct the airflow, or use thicker disks etc. In addition to air turbulence excitation, disk is also subjective to excitation from electro-magnetic forces, occurring only when the disk mode frequency lined-up with excitation frequency. In this paper, the focus is not on how to reduce disk vibration, but on how to avoid disk resonance from a spindle motor design point of view. Basic Campbell plot is presented as a reference useful to all spindle motor designers. Case studies are discussed including root cause analysis and solutions.

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References

  • Hartman A, Lorimer W (2000) Undriven vibrations in brushless DC motors. Quantum Corp., technical report

  • Lorimer W (2004) EM modeling. Maxtor Spindle Motor Summit, January 2004

  • Lorimer W (2005) Spindle motor E-M frequency signatures. Maxtor Corporation Report

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Acknowledgment

Thank Wendy Lorimer, Jim-Po Wang, Dr Bi Chao for the helpful discussion during the process of preparing the paper.

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Authors and Affiliations

  1. Maxtor Corporation, 333 South Street, Shrewsbury, MA, 01545, USA

    Guojin Yue, Michael J. Rogers & Cruz Calderon

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  1. Guojin Yue
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  2. Michael J. Rogers
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  3. Cruz Calderon
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Corresponding author

Correspondence to Guojin Yue.

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Yue, G., Rogers, M.J. & Calderon, C. Disk resonance due to electro-magnetic excitation. Microsyst Technol 13, 741–749 (2007). https://doi.org/10.1007/s00542-006-0269-x

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  • DOI: https://doi.org/10.1007/s00542-006-0269-x

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