Constant pressure pump

Details Constant pressure pump Constant pressure pump

1975-05-27

1976-10-12

Freeh, William L.

Pumps

Condition responsive control of pump drive motor

Single motor control element responsive to means sensing...

417 22, 417 42, 417 44, 417 45, F04B 4906

Patent

active

039854671

ABSTRACT:
A controller maintains a constant desired fluid pressure in a fluid load driven by a variable flow fluid pump with a variable speed motor. A set point signal representing desired pressure and a signal from a pressure transducer representing actual pressure are applied to an error amplifier. The resulting error signal is applied through a variable gain stage to the motor control. The variable gain stage includes first and second variable gain amplifiers the first of which has a gain which is controlled inversely to pressure. The second variable gain amplifier has a gain which is controlled in proportion to flow. In this manner, the gain of the controller changes in inverse proportion to the restriction of the fluid load. This makes the performance of the controller independent of changes in the fluid load by keeping the total loop gain constant.

REFERENCES:
patent: 3334285 (1967-08-01), Blake
patent: 3424370 (1969-01-01), Law
patent: 3439622 (1969-04-01), Welty et al.
patent: 3502026 (1970-03-01), Toyodo
patent: 3743442 (1973-07-01), Wilson
patent: 3797966 (1974-03-01), Randell

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