Method and device for operating electric drives
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United States of America Patent
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-
Sep 8, 1992
Grant Date -
N/A
app pub date -
Dec 26, 1990
filing date -
Dec 14, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
For operating electric drives, in particular of two-pole and multi-pole asynchronous induction motors intended for driving devices having at least two significantly different operating speeds it is proposed to operate at least one two-pole or multi-pole multi-phase asynchronous induction motor from a single-phase mains supply (L, N) by rendering conductive each of a plurality of power semiconductors (Triac T1, T2, T3) being connected in series to one of the windings (W1, W2, W3) each, only during a half wave of the single-phase supply voltage, in a manner staggered in time relative to the other series-connected semiconductor switches, and successively relative to the latter (FIG. 1).
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