Method and apparatus for overspeed protection for high speed...

Details Method and apparatus for overspeed protection for high speed... Method and apparatus for overspeed protection for high speed...

B - Operations, Transporting

04

B

318/94

B04B 9/10 (2006.01) B04B 13/00 (2006.01) G01M 1/10 (2006.01)

Patent

CA 1283444

METHOD AND APPARATUS FOR OVERSPEED PROTECTION FOR HIGH SPEED CENTRIFUGES ABSTRACT OF THE DISCLOSURE An apparatus and method of protecting a cen- trifuge from rotor overspeed and resultant mishap by computation of the rotor moment of inertia is disclosed. In the preferred embodiment, a centrifuge is driven by a rotor mounted on a shaft which shaft is in turn driven by a constant current motor. A tachometer for detecting angular velocity of the drive shaft is used. A desired and ultimate centrifuge operating speed is selected by the operator. The times at which the rotor passes the rough discrete speeds are recorded and from the time difference the moment of inertia is computed. The mo- ment of inertia can thereafter be utilized to discretely identify or "finger print" rotors to disqualify certain rotors from use in particular centrifuge protocols and establish gross limits of centrifuge operating speed.

566548

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