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Abstract
Iron core loss is the major loss in electrical machines. It performs up to 25% of total machine losses. The machine efficiency calculation requires an accurate prediction of losses. The accuracy of losses calculation depends largely on the equivalent circuit parameter determination and measurements. In this paper, an accurate procedure of iron core loss determination considering the variation effect of supply voltage, iron core temperature, rotor parameters due to skin effect, and magnetizing saturation. The iron core resistance is performed as main component in the equivalent circuit. This resistance is a function of supply voltage and used to calculate part of stray loss as well as iron core loss. The theoretical model is compared with practical results with high accuracy, which proves the validity of the proposed procedure.
Highlights
Iron core losses in electrical induction machines operate with sinusoidal power supplies account for 15-25% of the total machine losses [1, 2], which are one of the major losses in electrical machines
All the specifications and parameters of these machines are given as follows: The test setup bench consists of an induction machine coupled with a DC machine to determine the output load power of the induction machine when operates as a motor, and the DC machine is used as a generator when the machine operates as an induction motor
An accurate iron core loss calculation procedure is used in the equivalent circuit model of the induction machine to improve the performance calculations of the machine
Summary
Iron core losses in electrical induction machines operate with sinusoidal power supplies account for 15-25% of the total machine losses [1, 2], which are one of the major losses in electrical machines. The losses in the stator and rotor iron cores are due to the space fundamental and harmonic fluxes. These losses consist of hysteresis loss, eddy current loss, and excess loss. Under normal operation of the machine, the rotor current frequency is very small, and the hysteresis loss in the rotor core can be neglected, while the stator current frequency is the same as that of the supply and hysteresis loss in the stator core is appreciable
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