Determination of Eddy-Current and Hysteresis Losses in the Magnetic Circuits of Electrical Machines

Abstract

We consider the problem of separation of the total losses in the electric steel of a magnetic circuit into two components: the losses caused by hysteresis and the losses caused by eddy currents. The solution of this technical problem would enable us to guarantee the possibility of efficient design and construction electric machines with magnetic circuits characterized by low magnetic losses. We deduce computational formulas for the hysteresis and eddy-current components of losses, which contain the levels of total losses measured in the open-circuit tests for two different frequencies of magnetization reversal and the ratio of these frequencies. It is shown that the optimal ratio of the frequencies of magnetization reversal is equal to 1.2. We also present the plots of dependences and the expressions aimed at finding the exponent of dependence of the frequency of magnetization reversal on the measured open-circuit losses and the values of frequency.