Imperforate bowl: centrifugal separators – With condition responsive means – For controlling drive of driven means within bowl
Patent
1994-07-07
1996-04-23
Cooley, Charles E.
Imperforate bowl: centrifugal separators
With condition responsive means
For controlling drive of driven means within bowl
494 10, 494 14, 494 37, B04B 1300
Patent
active
055098819
ABSTRACT:
A method and system of identifying a rotor of a centrifuge employ an approach that uses two tiers of model selection. Firstly, the moment of inertia of a rotor is calculated for a first measured acceleration. The indication of moment of inertia is utilized to disqualify a number of rotor models and to select a subset of models. In a second tier, windage power of the rotor is calculated in a manner that isolates windage from inertial drag. In one embodiment, drive torque is measured with the rotor operated at a high constant speed. Alternatively, windage is calculated using data obtained during a second measured acceleration. The accuracy of the computation is enhanced by taking into account the moment of inertia as one form of resistance to the second acceleration. Based upon the indication of windage power, at least one rotor model within the subset is disqualified. Upon identification of the rotor, the centrifugal process can be maintained at a maximum safe speed. Moreover, a refrigeration offset circuit is controlled to provide a dynamic temperature correction with changes in windage power.
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Beckman Instruments Inc.
Cooley Charles E.
Hampson Gary T.
May William H.
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