Electricity: motive power systems – With particular motor-driven load device
Patent
1987-05-22
1989-05-02
Shoop, Jr., William M.
Electricity: motive power systems
With particular motor-driven load device
494 9, 494 10, 361 23, 388930, 388933, 388903, 388904, H02P 528
Patent
active
048271977
ABSTRACT:
An apparatus and method of protecting a centrifuge 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 through discrete speeds are recorded and from the time difference the moment of inertia is computed. The moment 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.
REFERENCES:
patent: 3436637 (1969-04-01), Ehret
patent: 3921047 (1975-11-01), Carter et al.
patent: 4284931 (1981-08-01), Ehret
patent: 4286203 (1981-08-01), Ehret
patent: 4470092 (1984-09-01), Lombardi
patent: 4568325 (1986-02-01), Cheng et al.
patent: 4700117 (1987-10-01), Giebelen et al.
Beckman Instruments Inc.
Harder Paul R.
Martin David
May William H.
Shoop Jr. William M.
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