Method and device for determining an imbalance and application of the device
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United States of America Patent
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Aug 19, 1997
Grant Date -
N/A
app pub date -
Jul 30, 1996
filing date -
Oct 25, 1995
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In order to determine an imbalance of a rotor caused to turn by means of a driving arrangement, imbalance-produced deflections or accelerations of the driving arrangement, spring-loaded with respect to a stationary housing, are determined and relayed as an electrical signal to an evaluation device. The sensor may be, for example, a piezoelectric crystal for detection of accelerations of the drive unit caused by imbalance or a path sensor for detection of deflections of the drive unit relative to the housing as a result of imbalance. The signal is evaluated as a function of the rotary speed of the rotor by means of an adaptive band filter. The method is especially suitable for determination of imbalance during operation of laboratory centrifuges, where an imbalance can occur, for example, from breakage of test tubes.
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