TWO-SPEED INDUCTION MOTORS FOR THE ENERGY SAVING MEASURES.

Abstract

Induction motors are very widely spread in all countries of the world because of their simplicity, reliability and cheapness. Many millions of induction motors are exploited in the New Independent States of the former Soviet Union and about 60% of them operate with the propeller torque characteristics line to the torque characteristics of such mechanisms as fans, pumps and so on. Just as the speed adjusting of pumps and fans in connection with the technological or seasonal variation of load allows to economize more than 25% of consumed energy. One part of these mechanisms has a variable-speed drive (for example pumps, fans and other mechanisms at the electric power peants, at the mines, etc.), another part has only constant speed although the use of speed adjusting is very actual for it also with point of view of the energy saving by means of electrical drive.