Control system and method

Details Control system and method Control system and method

1978-02-06

1979-11-13

Geoghegan, Edgar W.

Power plants

System having plural motors or having diverse types of...

Motors intercontrolled responsive to angular speed...

60719, 60327, 60DIG2, F01D 1700

Patent

active

041738705

ABSTRACT:
Disclosed are apparatus and methods for controlling parameters of fluid-driven systems. A control unit of the invention compares an input control signal to a tachometer signal from a fluid-driven turbine to produce a flow signal for controlling the turbine speed. The speeds of turbines in series are linked by the tachometer signal of the first turbine acting as the control signal for the following turbines. A critical speed interval is identified in relation to a range of values of the control signal. As the speed of a turbine is increased or decreased, its control unit holds the turbine speed at the limit of the critical speed interval, then rapidly accelerates the turbine through the interval to avoid prolonged operation at the turbine's critical speed. The individual critical speeds of separate turbines in series may be accommodated by critical speed intervals defined in separate control units for each of the turbines. Multiple critical speeds for a given turbine may also be provided for by defining multiple critical speed intervals within the corresponding control unit.

REFERENCES:
patent: 1937349 (1933-11-01), Kieser
patent: 2204138 (1940-06-01), Knowlton
patent: 3812377 (1974-05-01), Malone

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