Apparatus and method for controlling the speed of an induction m

Details Apparatus and method for controlling the speed of an induction m Apparatus and method for controlling the speed of an induction m

1979-02-13

1981-08-18

Truhe, J. V.

Electricity: motive power systems

Induction motor systems

Primary circuit control

318611, 318645, 318335, 318307, 364734, 166 53, 166 68, 1374875, 417 53, H02P 528, G06F 728, E21B 3303, F16K 3112

Patent

active

042849438

ABSTRACT:
A method and control apparatus are disclosed for maintaining a measured parameter of an environment in a closed-loop system within a range of the desired level for that parameter, to an accuracy greater than that of the parameter measuring device in the closed-loop system. The control apparatus periodically receives measurement readings of the parameter to be controlled from a sensor, having a fixed measurement accuracy. An adjustable length memory stores a historical value of changes between the periodically obtained parameter measurements that have occurred over a predetermined length of time. The control apparatus and method generates a control signal for regulating a prime mover acting on the environment which affects the measured parameter, by combining the historical value change data stored in the memory with the difference between a current parameter measurement and the desired parameter value. Means for conditioning the historical data in response to weighting factors corresponding to the closed-loop environment are provided.

REFERENCES:
patent: 3372268 (1968-03-01), Hoernes
patent: 3613391 (1971-10-01), Harter
patent: 3699989 (1972-10-01), O'Connor et al.
patent: 4031369 (1977-06-01), Heaman et al.
patent: 4061565 (1977-01-01), Kawai
patent: 4102394 (1978-07-01), Botts
patent: 4199817 (1980-04-01), Conkling et al.
patent: 4200827 (1980-04-01), Oswald

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