Three Phase Equivalent Circuit of Linear Induction Motor

Abstract

Presented evaluation method of a linear induction motor, hereinafter LIM, phases’ current asymmetry enables us to analyze motor’selectromagnetic processes and characteristics being an appropriate voltage supply. Three phase asymmetric inductor’s current system isdivided into direct and indirect sequence current’s linear density waves of different directions using a method of symmetric components.Then a task of electromagnetic field is solved using a spectral method, i. e. applying two-sided Fourier change for non-periodicfunctions of the coordinate x. LIM asymmetric equivalent scheme’s resistance calculation is based on estimation of electrical fieldintensity, electromagnetic power and the whole magnetic field inducted electromotive force in each inductor’s phase. In this case,Maxwell equations’ system is recorded and worked out taking into account one elementary component of continuous spectrum.According to resistance and electromotive force estimations LIM three phase equivalent scheme is made. In the scheme currentasymmetry, the cause of which are longitudinal and transverse edge effects and their interaction, is evaluated. In order to calculateinductor’s current, each phase voltage balance equations are presented. Il. 1, bibl. 13 (in Lithuanian; summaries in Lithuanian, Englishand Russian).