Abstract
Bias in disk drive rotary actuator bearings exhibits complex behavior related to the history of the actuator movement. This paper investigates the hysteresis component of bias present after seeks. Measurements of bias during full stroke actuator movements composed of multiple seeks of fixed length reveal that the magnitude of the hysteresis decreases as the lengths of component seeks increase up to a critical seek length. When the lengths of the component seek lengths are larger than the critical seek length, the magnitude of the hysteresis remains essentially constant. We explain these phenomena using a hypothesis based on bearing lubrication theory and the relationship between actuator velocity and seek length. We demonstrate a good empirical fit to the data which is strikingly similar from drive to drive and strongly supports our hypothesis.
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Armstrong-Helouvy B, Dupont P, Canudas de Wit C (1994) A survey of models, analysis tools and compensation methods for the control of machines with friction. Automatica 30(7):1083–1138
Bliman P, Sorine M (1993) A system-theoretic approach of systems with hysteresis application to friction modelling and compensation. In: Proceedings of the 2nd European control conference
Canudas de Wit C, Olsson H, Astrom K, Lischinsky P (1995) A new model for control of systems with friction. IEEE Trans Autom Control 40(3):419–425
Dahl P (1968) A solid friction model. Technical report, Space and missile systems organization air force systems command
Eddy K, Steele J, Messner W (1997) Bias in disk drive rotary actuators: characterization, prediction, and compensation. IEEE Trans Magn 33(3):2424–2436
Harris TA (1991) Rolling bearing analysis. Wiley, New York
Helmick D, Messner W (2005) Modeling complex bias behavior in disk drive actuators. In: ASME information storage and processing systems conference
Khonsari MM, Booser ER (1991) Applied tribology. Wiley, New York
Olsson H, Astrom K, de Wit C, Gafvert M, Lischinsky P (1998) Friction models and friction compensation. Eur J Control 4(3):176–195
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Helmick, D., Messner, W. & Higgs, C.F. Bias in hard disk drive rotary actuator pivot bearings: measurements and lubrication phenomena. Microsyst Technol 13, 1377–1382 (2007). https://doi.org/10.1007/s00542-007-0381-6
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DOI: https://doi.org/10.1007/s00542-007-0381-6