A1 Journal article (refereed), original research

Third-Order Harmonics in Synchronous Reluctance Motors With an Axially Laminated Anisotropic Rotor and Their Impact on the Motor Losses

Open Access publication

Publication Details
Authors: Abramenko Valerii, Petrov Ilya, Nerg Janne, Pyrhönen Juha
Publisher: Institute of Electrical and Electronics Engineers (IEEE): OAJ / IEEE
Publication year: 2020
Language: English
Related Journal or Series Information: IEEE Access
Volume number: 8
Start page: 152870
End page: 152880
Number of pages: 11
eISSN: 2169-3536
JUFO-Level of this publication: 2
Open Access: Open Access publication


The phenomenon of third-order harmonics in synchronous reluctance motors
(SynRMs) with an axially laminated anisotropic (ALA) rotor is studied.
The paper shows that a specific rotor geometry can distort the air-gap
flux density and induce third-order currents in the stator winding if it is delta connected. The third-order currents in different phases have the same phase shift angle and cannot, therefore, produce a rotating air-gap flux. Instead, they produce an air-gap flux that pulsates in time, and thus, causes eddy current losses in the rotor conducting parts. The phenomenon was described and proven with finite element simulation (FEM) of a 12 kW high-speed ALASynRM. The research underlines the importance of considering the third harmonic phenomenon in the
design of a two-pole ALASynRM intended for high-speed applications,
where a specific rotor geometry with a wide magnetically conducting middle layer is required.

Last updated on 2020-02-10 at 09:32