Apparatus for the control of a three-phase a.c. motor, especiall

Details Apparatus for the control of a three-phase a.c. motor, especiall Apparatus for the control of a three-phase a.c. motor, especiall

1989-07-17

1990-12-18

Ro, Bentsu

Electricity: motive power systems

Induction motor systems

Primary circuit control

318801, 318809, H02P 126, H02P 762

Patent

active

049789031

ABSTRACT:
The present invention is an apparatus for the control of a three-phase a.c. motor, especially a squirrel-cage motor. The apparatus includes inverse-parallel connected solid-state components (D,T) in each phase. At least one of the components is controllable. In the apparatus, the control circuit of at least one controllable solid-state component (T), e.g. thyristor, in each phase is connected via resistors (R.sub.2) to the control circuits in the other two phases.

REFERENCES:
patent: 3332008 (1967-07-01), Mueller et al.
patent: 3387196 (1968-06-01), Graham et al.
patent: 3526817 (1970-09-01), Plambeck
patent: 3564364 (1971-02-01), Neff
patent: 3665498 (1972-05-01), Kelemen et al.
patent: 4424474 (1984-01-01), Durr et al.
patent: 4459531 (1984-07-01), Dumont et al.
patent: 4469998 (1984-09-01), Nola
patent: 4482853 (1984-11-01), Bhavsar

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