Apparatus for the control of a three-phase a.c. motor, especially a squirrel-cage motor
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United States of America Patent
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-
Dec 18, 1990
Grant Date -
N/A
app pub date -
Jul 17, 1989
filing date -
Jul 19, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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