Method of driving the impeller of a liquid pump by means of a brushless a.c. motor; and a liquid pump for carrying out the method
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United States of America Patent
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Apr 16, 1985
Grant Date -
N/A
app pub date -
Jun 1, 1983
filing date -
Jul 28, 1982
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention relates to a method and apparatus for driving the impeller (5) in a turbo-type liquid pump operating at relatively low power and relatively high delivery head by means of an a.c. motor (2). The invention is mainly characterized in that the motor (2) is driven from a static inverter (6) which operates at an operating frequency of 100-1000 Hz. This enables high specific speed impellers to be used, and therewith provides a considerable increase in the efficiency and capacity of the pump at unchanged motor sizes.
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