Measuring and testing – Rotor unbalance – Dynamic
Patent
1998-06-24
2000-08-15
Kwok, Helen C.
Measuring and testing
Rotor unbalance
Dynamic
360 9808, 369270, G01M 102, G11B 2300
Patent
active
061018767
ABSTRACT:
A method of centering a disk pack on a base rotatably supporting the disk pack includes performing a series a steps while the disk pack is rotating. A reference timing signal is generated. A first imbalance in the rotating disk pack is detected, and a first imbalance signal is produced. The first imbalance signal is correlated with the reference timing signal to produce a first correlation value, which indicates a location of the first imbalance relative to the reference timing signal. Based upon the first correlation value, a first impact is applied to the base, causing the base to shift relative to the disk pack. As a result of the first impact, the first imbalance moves to a second imbalance. The second imbalance is detected, and a second imbalance signal is produced. The second imbalance signal is correlated with the reference timing signal to produce a second correlation value, which indicates a location of the second imbalance relative to the reference timing signal. A phase compensation value is also determined, based upon the first and second correlation values. The phase compensation value indicates a phase difference between an actual location of the first imbalance and a desired location of the first imbalance when the first impact was applied. Based upon the phase compensation value, a second impact is applied to the base, again causing the base to shift relative to the disk pack.
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Brooks Peter Everett
Gabrielson Lance Allen
Kwok Helen C.
Shara Milad G.
Western Digital Corporation
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