Abstract
The investigation of electromagnetical efficiency of the two-layer preformed six-phase winding is presented. At first the variation of phases of the six-phase windings was determined and, on the basis of the theory of three-phase windings, the development of the electrical circuit of the analyzed winding was formed. In order to determine the harmonic spectrum of rotating magnetomotive force created by the six-phase winding the instantaneous space function of rotating magnetomotive force was formed by using the created circuit and instantaneous values of the phase currents in the moment of time t = 0. The harmonic analysis of this function was performed and according to its results the electromagnetical efficiency factor of the analyzed six-phase winding was calculated. The obtained factor was compared to the electromagnetical efficiency factor of the two-layer preformed three-phase winding of analogous parameters and it was determined that it is 8,64 % higher than in the three-phase winding case. Additionally it was obtained that the amplitude value of the fundamental harmonic of rotating magnetomotive force of the analyzed six-phase winding is 1,983 times higher that the amplitude value of rotating magnetomotive force of the analogous three-phase winding. This means that the power factors of the alternating current electrical machines with the six-phase windings should be notably higher compared to the three-phase machines. Ill. 2, bibl. 8, tabl. 6 (in English; abstracts in English and Lithuanian). DOI: http://dx.doi.org/10.5755/j01.eee.119.3.1352
Highlights
The six-phase voltage system is used in practice only in very rare cases
The primary windings of such transformer are star-connected and two secondary threephase windings are star-connected with a common neutral node
Based on these parameters of rotating magnetomotive force function the conditional magnitudes Fs ν and relative magnitudes fν of the space harmonics of magnetomotive force created by six-phase winding were calculated using expression (11) (Table 4)
Summary
The six-phase voltage system is used in practice only in very rare cases. The opinion prevails that the three-phase voltage system optimally satisfies all the requirements of consumers of electrical power [1,2,3]. In order to obtain the six-phase voltage system it is required to have the three-phase transformed of the required power rating containing one primary ant two secondary windings of identical parameters [2]. The windings of the secondary circuit create the symmetrical six-phase voltage system which can be used to supply the six-phase synchronous and asynchronous alternating current motors. Such motors are not manufactured yet in any country since it is not clear if they would have any advantages (or only disadvantages) compared to the three-phase alternating current motors. The aim of this work is to investigate the six-phase winding of particular parameters by determining its electromagnetic efficiency and to compare it with the threephase winding of analogous parameters
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