SYSTEM AND METHOD FOR ENERGIZING AN ELECTRIC MOTOR AUXILIARY WINDING AND ELECTRIC MOTOR

摘要

The present invention relates to a system and a method for energizing an auxiliary winding of a capacitor-start single-phase induction motor. Said system and method aim at reducing the voltage level in the bidirectional switches present in the topology during the blocking of said switches. The system and method proposed also aim at providing smooth switching of the electromechanical bidirectional switch existing in the topology. These gains in the reduction of the voltage level in the bidirectional switches and the smooth switching of the electromechanical bidirectional switch are achieved by means of a system for energizing an auxiliary winding of an electric motor, the auxiliary winding (11 ) being connectable in series with a voltage network (VAC), the system comprising a start capacitor (14) and an electromechanical switch (12) connected in series with the auxiliary winding (11 ), the system comprising an electronic switch (13) connected in parallel with the series association of the electromechanical switch (12) and the start capacitor (14), the electronic switch (13) and the electromechanical switch (12) being used to turn on the auxiliary winding (11 ), the system being configured so that the electronic switch (13) can be turned on simultaneously with the electromechanical switch (12) and kept on simultaneously with the electromechanical switch (12) for a stabilization time (tb, td). A method for controlling the system of the present invention is also disclosed.