Abstract
The purpose of the work is to create an engineering procedure for the synthesis of starting rheostats on semiconductor thermo-resistors (STR) ensuring a simple and reliable start of electric motors. The developed procedure for the synthesis of starting rheostats based on STSs allows designing simple-formed, small cheap and reliable in operation starting devices of all kinds. 
 There is developed a universal method of the synthesis of STR-based starting rheostats based on two installed invariants of the similarity of starting processes connecting specified starting indices with the parameters of STR-based rheostats. 
 The method applies to different types of electric motors taking into account:
 - changing temperature conditions of environment; 
 - quantitative indices of semiconductor material;
 - different types of thermo-resistors. 
 A corresponding algorithm of for the computation of STR-based starting rheostats is developed. 
 It is proved that a field of thermo-resistor rheostat application is dc and ac electric motors. In the paper there are shown design peculiarities of semiconductor thermo-resistor creation and a number of limitations on which a character of starting electric installations depends are formulated.
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