Electricity: motive power systems – Positional servo systems – With particular motor control system responsive to the...
Patent
1985-04-30
1987-05-05
Shoop, Jr., William M.
Electricity: motive power systems
Positional servo systems
With particular motor control system responsive to the...
318696, 318135, G05B 1940
Patent
active
046635769
ABSTRACT:
Apparatus and method are disclosed for continually generating data values (M) indicative of the time dependent waveform of the current (I.sub.C) in a control rod latch actuation circuit (28), during application of a pulsed drive voltage (30). A data value is selected that represents a value limit (M.sub.min) characteristic of the waveform during the time before the latch (14) has reached a critical position of interest. The most recently generated data value (M.sub.N) is compared to the value limit (M.sub.min), and a control signal (e.g., 74, 52, LH) is generated when the most recently generated data value (M.sub.N) exceeds the value limit (M.sub.min). The data values (M) preferably indicate the time derivative of the waveform (I.sub.C) at a plurality of predetermined times during application of the drive voltage. Latch movement to the critical position is indicated when the algebraic value of the waveform time derivative exceeds, by a predetermined setpoint, the minimum algebraic value computed at regular time intervals during application of the drive voltage.
REFERENCES:
patent: 4074179 (1978-02-01), Kuo et al.
patent: 4216648 (1980-08-01), Maire
patent: 4351039 (1982-09-01), Berney
patent: 4381481 (1983-04-01), Kuppern et al.
Burns, III Joseph E.
Scarola Kenneth
Bergmann Saul M.
Combustion Engineering Inc.
Mulholland John H.
Shoop Jr. William M.
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