Basic and additional core losses of the high-speed small size induction motors

Abstract

The paper presents the calculation of the basic and additional core loss of the small size induction motor supplied from the power network for 50 Hz, and by a voltage-frequency converter for the frequency changing from 0 to 250 Hz. The calculations were made by use the field - circuit method, as well as by use known from the literature circuit methods. The calculation results were verified by measurement. Calculations were performed using the measured characteristics of the specific core losses of the electrical sheets as a function of the flux density and frequency