Control method for displacement-type fluid machine, and apparatu

Details Control method for displacement-type fluid machine, and apparatu Control method for displacement-type fluid machine, and apparatu

1998-03-26

2000-04-25

Solis, Erick R.

Pumps

Condition responsive control of pump drive motor

By control of electric or magnetic drive motor

318807, F04B 4906

Patent

active

060537035

ABSTRACT:
A method and an apparatus for controlling a displacement-type fluid machine which handles fluid including gas and/or liquid for increasing or decreasing pressure of the fluid or transporting the fluid including the use of an alternating current motor for driving the displacement-type fluid machine and a frequency converter which is capable of conducting frequency conversion up to a range higher than the power source frequency to adjust the number of revolutions of the motor. Wherein the number of revolutions is adjusted so that input current to the motor is kept constant, regardless of any change in operating pressure of the displacement-type fluid machine, whereby the displacement-type fluid machine is operated maintaining the process values within an allowable limit without effecting repeated actuation and stopping of the machine.

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patent: 5486106 (1996-01-01), Hehl
patent: 5563490 (1996-10-01), Kawaguchi et al.

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