Power factor correction for variable speed drive

Details Power factor correction for variable speed drive Power factor correction for variable speed drive

1982-12-20

1984-08-21

Rubinson, G. Z.

Electricity: motive power systems

Induction motor systems

Primary circuit control

318803, 318807, H02P 540

Patent

active

044672586

ABSTRACT:
A variable speed drive for an AC motor has features to improve the power factor. The system uses a rectifier for converting AC supply voltage into DC voltage on a positive rail and a negative rail. Frequency switches are controlled to alternately connect the rails to the power conductors at a variable rate to define a selected voltage frequency. An amplitude switch is located on one of the rails and controlled to vary the potential between the rails in proportion to the frequency. A current sensor senses the current waveform in one of the conductors and applies it to a phase detector which detects the difference in phase between the current and the voltage. Phase difference pulses are produced which are averaged into an average DC value. The DC value is applied to a demand voltage that controls the amplitude switch to reduce the amplitude to improve power factor.

REFERENCES:
patent: 4024444 (1977-05-01), Dewan et al.
patent: 4123692 (1978-10-01), Gilmore et al.
patent: 4145647 (1979-03-01), Neilsen et al.
Applicants: Dick L. Knox et al.; Ser. No. 06/313,043; filed: 10/19/81; For: "Motor Variable Frequency Drive".

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