FIELD: transformation equipment used in asynchronous electric motor.
SUBSTANCE: proposed device contains three-phased volt-adding transformer, secondary windings of which, connected oppositely-serially with stator winding of motor, are connected to network voltage source in parallel to primary windings, connected in accordance to star scheme. Functions for controlling volt addition voltage by method of high frequency pulse-duration modulation are performed by force transistor key at output of three-phased diode bridge, realizing function of zero point of the star. Limitation is applied to launch current by smoothly incrementing resulting voltage of stator windings of motor due to decrease to zero of negative volt addition created by aforementioned transformer.
EFFECT: decreased amount of semiconductor keys in composition of launch-controlling device and improved shape of current of stator windings of asynchronous motor.
3 dwg
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