Pumps – Condition responsive control of pump drive motor – Responsive to change in rate of pump fluid flow
Patent
1991-05-21
1993-08-31
Bertsch, Richard A.
Pumps
Condition responsive control of pump drive motor
Responsive to change in rate of pump fluid flow
417 45, F04D 1500
Patent
active
052403807
ABSTRACT:
A control system (10) for a variable speed centrifugal pump (12) in which pump pressure as a function of flow rate for a constant speed of operation of the pump has a range of flow rates in which the pump pressure increases as a function of increasing flow rate which is unstable in accordance with the invention includes a sensor (14) for sensing an operational parameter of an output flow pumped by the pump; a variable speed drive (16) for driving the pump at a commanded rotational speed in response to a commanded speed signal; and a controller (22), responsive to the sensed operational parameter, for producing the commanded speed signal (N) as a function of pump speeds at which the pump pressure does not increase with increasing flow rate.
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Bertsch Richard A.
Scheuermann David W.
Sundstrand Corporation
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