Control system for induction motor using inverter for AC power s

Details Control system for induction motor using inverter for AC power s Control system for induction motor using inverter for AC power s

1981-12-02

1983-12-13

Smith, Jr., David

Electricity: motive power systems

Induction motor systems

Power-factor control

H02P 540

Patent

active

044207182

ABSTRACT:
An control system for an induction motor driven by an AC output of variable frequency and voltage produced from an inverter which converts DC power obtained by a converter through conversion of AC power having constant voltage and constant frequency. The system comprises means for estimating the power factor of the induction motor from an input current to the inverter, means for controlling the voltage of the AC output from the inverter when the estimated power factor is outside a predetermined range, and means for restricting the control of the AC output voltage to prevent the ratio between the AC output voltage and the AC output frequency from exceeding a predetermined range.

REFERENCES:
patent: 4249120 (1981-02-01), Earle
patent: 4291264 (1981-09-01), Siemon

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