Power factor control system for inverter-driven a-c induction mo

Details Power factor control system for inverter-driven a-c induction mo Power factor control system for inverter-driven a-c induction mo

1979-09-04

1981-09-22

Truhe, J. V.

Electricity: motive power systems

Induction motor systems

Power-factor control

318798, 318812, H02P 124, H02P 142, H02P 318, H02P 528

Patent

active

042912644

ABSTRACT:
The power factor in an inverter-driven induction motor is held relatively constant at a desired optimum value, despite variations in mechanical loading on the motor, by monitoring the d-c bus current to determine the ratio of real and reactive currents, thereby to detect the actual power factor. The actual and desired power factors are then effectively compared and the resulting error signal is fed back to the inverter's d-c power supply to adjust the inverter output voltage to change the reactive current to the extent necessary to maintain the desired power factor.

REFERENCES:
patent: 3611089 (1971-10-01), Mokrytzki et al.
patent: 3619749 (1971-11-01), Schieman
patent: 3919609 (1975-11-01), Klautschek et al.
patent: 3935518 (1976-01-01), Yatsuk et al.
patent: 4041361 (1977-08-01), Cornell
patent: 4052648 (1977-10-01), Nola
patent: 4186334 (1980-01-01), Hirata
patent: 4207510 (1980-06-01), Woodbury

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