RESEARCH PAPERS: Mechanisms Papers

Effect of Pivot Clearance on Head Positioning of a Rotary Actuator for Magnetic Disk Storage

[+] Author and Article Information
T. Kakizaki

Magnetic Storage Section, NTT Electrical Communications Laboratories, Tokyo 180 Japan

J. Mech., Trans., and Automation 108(4), 556-561 (Dec 01, 1986) (6 pages) doi:10.1115/1.3258769 History: Received July 01, 1986; Online November 19, 2009


The effect of pivot clearance on the dynamic characteristics of a rotary actuator for head positioning in magnetic disk storage is numerically investigated. A motion equation which takes pivot clearance and pivot bearing elasticity into account is derived for a track-following servo-controlled actuator. Elastic deformation of a bearing as well as head positioning error increase in a sudden step when the bearing makes alternating impacts at the antipodes of the pivot shaft. Based on the result, design criteria are obtained for the maximum acceptable clearance for high accuracy in head positioning.

Copyright © 1986 by ASME
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