Energy efficiency of electric motors

Svrha ovog rada bila je navesti podjelu i ukratko objasniti najznaĉajnije tipove elektromotora, zatim navesti i objasniti tipove gubitaka te napraviti jednostavan proraĉun na kojem moţemo vidjeti kolika je ušteda elektriĉne energije, a time i novca pri zamjeni starog motora novim uĉinkovitijim. Ukratko su objašnjeni faktori uĉinkovitosti i materijali koji se koriste u proizvodnji elektromotora. Objašnjeni su principi rada istosmjerni, sinkroni i asinkroni motora te je predstavljena alternativa za asinkrone motore. Na kraju rada prije proraĉuna je opisana implementacija trenutno vaţećih standarada minimalne energetske uĉinkovitosti te dana tablica s minimalnim energetskim uĉinkovitostima asinkronih motora prema zadnjem IE4 standardu.The purpose of this paper was to list the division and briefly explain the most significant types of electric motors, then outline and explain the types of losses and make a simple calculation to see how much energy and therefore money is saved when replacing an old electric motor with a new one. Efficiency factors and materials used in the manufacture of electric motors are briefly explained. The operating principles of DC, synchronous and asynchronous motors are explained and an alternative to asynchronous motors is presented. At the end of the work, the implementation of the current minimum energy efficiency standards and the tables with the minimum energy efficiency of asynchronous motors according to the latest IE4 standard are described before the savings calculation