Abstract
New construction of the device, for implementation of the smooth amplitude start-up of asynchronous engines, allowing to minimize quantity of force semiconductor keys and to meet requirements to electromagnetic compatibility is considered. Ways of reduction of mass-dimensional indexes of the booster transformer which is a constructive basis of the offered device by the drive elimination of a network low frequency component of tension in its primary winding are shown. Efficiency of this decision is confirmed with the analysis of a magnetic status of the core of the transformer in the starting mode taking into account a hysteresis and the subsequent comparing of patterns of direct and smooth start-up of the asynchronous engine in the computer program Matlab/Simulink.
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