Variable speed control for centrifugal pumps
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United States of America Patent
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Aug 31, 1993
Grant Date -
N/A
app pub date -
May 21, 1991
filing date -
May 21, 1991
priority date (Note) -
Expired
status (Latency Note)
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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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