Electricity: motive power systems – Braking – Automatic and/or with time-delay means
Patent
1979-03-14
1981-08-18
Smith, Jr., David
Electricity: motive power systems
Braking
Automatic and/or with time-delay means
318314, 318327, 318490, 318449, H02P 308, H02P 318
Patent
active
042849314
ABSTRACT:
In an overspeed protection system for a centrifuge apparatus of the type including a rotor driven by a drive motor, a transducer for providing a signal whose frequency is a function of the rotational speed of the centrifuge rotor, an oscillator for generating a reference signal having a predetermined frequency, means for mixing the rotational speed signal with the reference signal to provide a difference frequency signal, a filter coupled to the output of the mixing means for passing signals having frequencies below a predetermined frequency, and means coupled to the filter for disconnecting power to the drive motor in response to an output signal from the filter, there is disclosed an improvement comprising a frequency comparator responsive to the rotational speed signal and the reference signal for generating an overspeed signal when the frequency of the rotational speed signal exceeds the frequency of the reference signal, and means for combining the outputs of the filter and the frequency comparator at the input to the power disconnecting means.
REFERENCES:
patent: 3110853 (1963-11-01), Jones
patent: 3361949 (1968-01-01), Brown et al.
patent: 3436637 (1969-04-01), Ehret
Morgan, D., "Micropower Phase-Locked Loop Widens Designer's Choice," Electronics, 9-25-72, pp. 121-122.
Beckman Instruments Inc.
Mehlhoff F. L.
Smith Jr. David
Steinmeyer R. J.
Stern Robert J.
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