A1 Journal article (refereed), original research

Modeling and Mitigation of Rotor Eddy-Current Losses in High-Speed Solid-Rotor Induction Machines by a Virtual Permanent Magnet Harmonic Machine

Publication Details
Authors: Di Chong, Petrov Ilya, Pyrhonen Juha J.
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Publication year: 2018
Language: English
Related Journal or Series Information: IEEE Transactions on Magnetics
Volume number: 54
Issue number: 12
ISSN: 0018-9464
eISSN: 1941-0069
JUFO-Level of this publication: 1
View additional information: View in Web of Science™
Open Access: Not an Open Access publication


much more rugged than a rotor made of traditional steel sheets, a solid rotor
is frequently used in high-power high-speed induction machines (IMs). Further, by a solid-rotor machine, a higher
rotating speed can be achieved. However, the solid rotor also has certain disadvantages,
the relatively high solid-rotor eddy-current losses being the most serious one.
Basically, solid-rotor eddy-current losses are mainly induced by time-spatial
air-gap flux density high-order harmonics. Suppression of the high-order
harmonics is the key means to mitigate the rotor eddy-current losses. In this
paper, a novel computational model is proposed for evaluating the rotor
harmonic eddy-current losses of a 2 MW, 12000 rpm IM. The model was built on a
special machine referred to as a virtual permanent magnet harmonic machine
(VPMHM). The model was constructed by applying the finite element method (FEM),
and it is based on the time-spatial harmonics produced by a rotating magnet
with sinusoidal magnetization. The VPMHM model links the air-gap flux density
harmonics directly to the specific rotor eddy-current losses. Further, according
to the proposed model, three options, namely the use of air-gap permeance
modifying notches on the stator teeth, semimagnetic wedges, and their
combination, were investigated in detail for mitigating the rotor eddy-current
losses in the motor nominal operating point. The results and conclusions in the
paper are based on the FEM analysis.

Last updated on 2019-13-03 at 12:00