Speed control method for AC motors and an apparatus for the cont

Details Speed control method for AC motors and an apparatus for the cont Speed control method for AC motors and an apparatus for the cont

1978-10-18

1981-10-20

Truhe, J. V.

Electricity: motive power systems

Induction motor systems

Primary circuit control

318812, H02P 528, H02P 318, H02P 534, H02P 536

Patent

active

042963672

ABSTRACT:
A frequency converter applies a variable voltage with a variable frequency to an AC motor coupled with a load. At least one frequency region is set up for the variable frequency. The ratio of a percentage input voltage expressed in terms of a percentage of the rated input voltage of the AC motor, to a corresponding percentage input frequency expressed in terms of a percentage of the rated input frequency of the AC motor, is set less than 1 within the frequency region thus set. Also an apparatus for the AC motor control provided.

REFERENCES:
patent: 3671831 (1972-06-01), Chausse et al.
patent: 3919609 (1975-11-01), Klautschek et al.
patent: 3967173 (1976-06-01), Stich
patent: 4023083 (1977-05-01), Plunkett

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