A1 Journal article (refereed), original research

Extraction of Rotor Eddy-Current Harmonic Losses in High-Speed Solid-Rotor Induction Machines by an Improved Virtual Permanent Magnet Harmonic Machine Model

Open Access publication

Publication Details
Authors: Di Chong, Petrov Ilya, Pyrhönen Juha
Publisher: Institute of Electrical and Electronics Engineers (IEEE): OAJ / IEEE
Publication year: 2019
Language: English
Related Journal or Series Information: IEEE Access
ISSN: 2169-3536
eISSN: 2169-3536
JUFO-Level of this publication: 2
Open Access: Open Access publication


High-speed induction machines (IMs) equipped with a solid steel rotor are capable of achieving a higher rotating speed than other types of machines because of their simpler and more robust rotor structure. At the same time, however, the eddy-current losses in the solid rotor may be critical because of the high conductivity of the rotor material, which makes it easy for axial eddy currents to travel in the solid rotor. To efficiently mitigate the rotor eddy-current losses, it is important to accurately determine the rotor eddy-current losses induced by a particular harmonic in advance. In this paper, an improved virtual permanent magnet harmonic machine (VPMHM) model equipped with a sinusoidally magnetized virtual magnet based on the finite element method (FEM) is proposed for determination of the rotor eddycurrent harmonic losses. The 2-D fast Fourier transform was used to accurately analyze the time-spatial air-gap flux density harmonics. The VPMHM model was enhanced to ensure that it was able to exactly produce the required flux density harmonics in the air gap. Two algorithms for the improved VPMHM models with different hybrid excitations were proposed to determine the harmonic losses together with the other important harmonic behavior. The model was further investigated to separate the electromagnetic transients from different harmonics. Finally, the simulation time for the harmonic losses required by the enhanced VPMHM model was significantly reduced by separating the harmonic transients. All the results and conclusions presented in this paper are based on the FEM analysis.

Last updated on 2020-20-03 at 10:03