Method and device for operating electric drives

Details Method and device for operating electric drives Method and device for operating electric drives

1990-12-26

1992-09-08

Smith, Jr., David

Electricity: motive power systems

Induction motor systems

Primary circuit control

318809, H02P 540

Patent

active

051461463

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).

REFERENCES:
patent: 3908158 (1975-09-01), Studtmann
patent: 4243926 (1981-01-01), Phillips
patent: 4300077 (1981-11-01), Katz et al.
patent: 4461985 (1984-07-01), Stitt

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