Variable frequency power unit controlling system

Details Variable frequency power unit controlling system Variable frequency power unit controlling system

1985-02-06

1987-09-01

Smith, Jr., David

Electricity: motive power systems

Induction motor systems

Primary circuit control

318806, H02P 540

Patent

active

046911561

ABSTRACT:
A variable frequency power unit controlling system for controlling a variable frequency power unit to supply an electric current of a frequency corresponding to a desired revolving rate of an electric motor. A control signal designating the revolving rate of the electric motor is integrated by an integrating circuit and the output frequency of the variable frequency power unit is held at a predetermined value regardless of the control signal, when the change rate of the output signal of the integrating circuit deviates from a predetermined range of change rate.

REFERENCES:
patent: 3576485 (1971-04-01), Coons, Jr. et al.
patent: 3671831 (1972-06-01), Chausse et al.
patent: 3778696 (1973-12-01), Walters et al.
patent: 3790778 (1974-02-01), Oster

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