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Effect of combined stator winding on reduction of higher spatial harmonics in induction machine

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Abstract

The paper introduces the possibility to eliminate certain groups of spatial harmonics of the current layer, magnetic flux density in the air gap and flux in the yoke of the induction machine with the aim to increase the efficiency. The content of higher spatial harmonics is reduced by means of the so-called combined winding. It is shown how this winding must be arranged in stator slots so that the selected groups of spatial harmonics mutually reduce themselves. The results of the theoretical analysis were validated by the measurements on the experimental machine with the implemented combined winding. Eventually these results were compared with those of the machine with the classical three-phase winding.

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Abbreviations

\({\varvec{{i}}}_{N_{\delta \nu } } \) :

Space vector of \(\nu \)th spatial harmonic of current layer of \(\delta \)-connected winding group

\(\kappa _{\delta \nu } \) :

Winding factor of \(\delta \)-connected winding part for \(\nu \)th spatial harmonic

\(N_\delta \) :

Number of conductors of single \(\delta \)-connected winding part

\(i_{A_\delta }\), \(i_{B_\delta }\), \(i_{C_\delta }\) :

Instantaneous values of currents in stator \(\delta \)-connected winding group

\({\varvec{a}}\) :

Unit vector of three-phase winding

\({\varvec{i}}_{N_{\lambda \nu } } \) :

Space vector of \(\nu \)th spatial harmonic of current layer of \(\lambda \)-connected winding group

\(\kappa _{\lambda \nu }\) :

Winding factor of \(\lambda \)-connected winding part for \(\nu \)th spatial harmonic

\(N_\lambda \) :

Number of conductors of single \(\lambda \)-connected winding part

\(i_{A_\lambda }\), \(i_{B_\lambda }\), \(i_{C_\lambda }\) :

Instantaneous values of currents in stator \(\lambda \)-connected winding group

\(\kappa _{S\nu }\) :

Winding factor of stator winding for \(\nu \)th spatial harmonic

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Acknowledgments

This work was supported by the Grant Agency of the Czech Republic under research Grant Nos. 13-35370S and 16-07795S, and by the institutional support RVO 61388998. The authors would like to thank the company ATAS elektromotory Náchod, a.s. for cooperation and manufacturing the experimental machine.

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Authors and Affiliations

  1. Department of Electrical Engineering and Electrophysics, Institute of Thermomechanics CAS, v.v.i., Dolejskova 5, 182 00, Prague, Czech Republic

    L. Schreier, J. Bendl & M. Chomat

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  1. L. Schreier
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  2. J. Bendl
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  3. M. Chomat
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Correspondence to M. Chomat.

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Schreier, L., Bendl, J. & Chomat, M. Effect of combined stator winding on reduction of higher spatial harmonics in induction machine. Electr Eng 99, 161–169 (2017). https://doi.org/10.1007/s00202-016-0409-y

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  • DOI: https://doi.org/10.1007/s00202-016-0409-y

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