RO117884B1 - Electronic starting device with controlled current for three-phase asynchronous motor, with integrated brake - Google Patents

Abstract

The invention relates to an electronic starting device with controlled current for a three-phase asynchronous motor, with integrated brake, meant to start a three-phase asynchronous motor without mechanical shocks the device comprising a variable alternating voltage regulator (2) consisting of two antiparallel connected thyristors which supplies one of the asynchronous motor phases (1), the other two phases of the motor being supplied directly from the three-phase supply mains by means of a supply contactor (3), the priming pulses for controlling the thyristors of the variable alternating voltage regulator (2) being generated by an electronic pulse generator unit (5) which furnishes pulses, whose succession in time is regulated by the current-time diagram implemented inside the electronic pulse generator unit (5) that is supplied by a supplying-isolating transformer (4), a short-circuit contactor (6), which short- circuits the terminals of the variable alternating voltage regulator (2) when the voltage threshold required by a threshold element (7) is exceeded, thereby cutting the supply of the primary circuit of the supplying-isolating transformer.