Review of Time and Space Harmonics in Multi-Phase Induction Machine

Vladimir Kindl, Radek Cermak, Zelmira Ferkova and Bohumil Skala
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Vladimir Kindl: Faculty of Electrical Engineering, University of West Bohemia, 306 14 Pilsen, Czech Republic
Radek Cermak: Faculty of Electrical Engineering, University of West Bohemia, 306 14 Pilsen, Czech Republic
Zelmira Ferkova: Faculty of Electrical Engineering and Informatics, Technical University of Kosice, 040 01 Košice, Slovakia
Bohumil Skala: Faculty of Electrical Engineering, University of West Bohemia, 306 14 Pilsen, Czech Republic

Energies, 2020, vol. 13, issue 2, 1-17

Abstract: Modern multiphase electric machines take advantage of additional degrees of freedom for various purposes, including harmonic current injection to increase torque per ampere. This new approach introduces a non-sinusoidal air gap flux density distribution causing additional technical problems and so the conventional assumptions need to be revised. The paper presents a methodology for synthesis of air gap magnetic field generated by a symmetrically distributed multiphase windings including the rotor field reaction due to the machine’s load. The proposed method is suitable either for single-layer or double layer windings and can be adopted either for full-pitched or chorded winding including slots effects. The article analyses the air gap flux density harmonic content and formulates conclusions important to multiphase induction motors. It also discusses effects of time harmonic currents and illustrates the principle of changing number of pole-pairs typical for harmonic currents being injected to increase torque.

Keywords: multiphase; induction; motor; space harmonics; time harmonics; injection (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (5)

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