• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2004.05a
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• pp.730-735
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• 2004

Nowadays, most small form-factor drives adapt a load/unload mechanism and the flying height of the head becomes more and more low. So, the load/unload velocity also becomes one of the important factors to ensure the reliability of the load/unload operation. To control the load/unload velocity accurately, velocity sensing is most important because there is no special velocity sensor during the load/unload operation. In this paper, we proposed a very practical method that measures the velocity from the BEMF voltage of a VCM. Then, the proposed method is applied to the load/unload velocity control using 2.5' drives in order to verify its usefulness.