Variable frequency power source operating system

Details Variable frequency power source operating system Variable frequency power source operating system

1985-02-06

1987-03-17

Smith, Jr., David

Electricity: motive power systems

Having plural, diverse or diversely controlled sources

318806, 318798, 307 64, H02P 540

Patent

active

046510729

ABSTRACT:
The output frequency of a variable frequency power source for driving a motor which drives a rotary body such as a fan in a variable-speed control mode is fixed, when abnormality in a control signal supplied to the variable frequency power source from outside to determine the output frequency of the variable frequency power source is detected, at the output frequency of the variable frequency power source immediately before the detection of abnormality in the control signal, and thereby the abnormal variation of the revolving rate of the motor resulting from the abnormality in the control signal is avoided.

REFERENCES:
patent: 3406319 (1968-10-01), Faulkes
patent: 3793573 (1974-02-01), Tsuboi
patent: 3821630 (1974-06-01), Korneumpf et al.
patent: 4281276 (1981-07-01), Cutler et al.

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