SYNCHRONOUS MOTOR START-UP METHOD Russian patent published in 2014 - IPC H02P1/26 H02K17/14 

FIELD: electricity.

SUBSTANCE: invention is related to the sphere of electric equipment and may be used for production of asynchronous motors with low starting current. Technical result is attained due to the connection diagram and increase in inductive reactance of the stator winding at wye-connection of phases. The method of synchronous motor start-up is suggested by means of switching of a three-phase stator winding in the course of which, according to the invention, two standard coil groups, from the first up to the sixth one, are included into phases of the bipolar winding, two pairs of coil groups, from the first up to the sixth one, are included into phases of the four-pole winding, three triples of coil groups, from the first up to the sixth one, are included into phases of the six-pole winding, at that the phase band width is changed from 120 electrical degrees to 60 electrical degrees by switching the winding from the delta-connection to the wye-wye-connection with formation of neutral point from the delta-connection middle without changes in a number of poles and breakage of phase winding connections.

EFFECT: reducing starting current by preliminary delta-connection of the winding to the mains with further switching to the wye-wye connection, at that switching is made without changes in a number of the stator winding poles and breakage of phase winding connections.

7 dwg, 1 tbl