scholarly journals Analytical prediction of rotor eddy current loss due to stator slotting in PM machines

2010 ◽  
Author(s):  
Dominic A. Wills ◽  
Maarten J. Kamper
Keyword(s):  
Eddy Current ◽  
Eddy Current Loss ◽  
Analytical Prediction ◽  
Current Loss

Air gap MMF based prediction of eddy current loss in the PMs of concentrated winding brushless machines

2014 ◽  
Vol 33 (5) ◽  
pp. 1558-1568 ◽  
Author(s):  
Asma Masmoudi ◽  
Ahmed Masmoudi
Keyword(s):  
Analytical Model ◽  
Eddy Current ◽  
Design Methodology ◽  
Eddy Current Loss ◽  
Analytical Prediction ◽  
Element Analysis ◽  
Content Type ◽  
Current Loss ◽  
Winding Machine ◽  
Practical Implications

Purpose – The purpose of this paper is to an analytical approach-based prediction of the eddy current loss in the PMs of a concentrated winding machine equipped with 12 slots in the stator and ten poles in the rotor. Design/methodology/approach – The investigation of the PM eddy current loss has been carried out using an analytical model and a 2D time-stepped transient finite element analysis (FEA). Findings – It has been found, in the case of the treated machine, that just the subharmonic of rank 1 and the harmonic of rank 7 have significant contributions to the eddy current loss in the PMs. Research limitations/implications – A shift between the results yielded by the developed analytical model and those computed by FEA has been noticed. This limitation is mainly due to the slotting effect which has been omitted in the analytical model. Practical implications – Fractional slot PM machines are currently given an increasing attention in automotive applications. The prediction of their iron loss in an attempt to rethink their design represents a crucial efficiency benefit. Originality/value – The analytical prediction of the eddy current loss in each PM then in all PMs and their validation by FEA represent the major contribution of this work.

Performance analysis of magnetic gear with Halbach array for high power and high speed

2020 ◽  
Vol 64 (1-4) ◽  
pp. 959-967
Author(s):  
Se-Yeong Kim ◽  
Tae-Woo Lee ◽  
Yon-Do Chun ◽  
Do-Kwan Hong
Keyword(s):  
Permanent Magnet ◽  
Eddy Current ◽  
High Power ◽  
High Speed ◽  
Torque Ripple ◽  
Eddy Current Loss ◽  
Element Analysis ◽  
Current Loss ◽  
Halbach Array ◽  
Magnetic Gear

In this study, we propose a non-contact 80 kW, 60,000 rpm coaxial magnetic gear (CMG) model for high speed and high power applications. Two models with the same power but different radial and axial sizes were optimized using response surface methodology. Both models employed a Halbach array to increase torque. Also, an edge fillet was applied to the radial magnetized permanent magnet to reduce torque ripple, and an axial gap was applied to the permanent magnet with a radial gap to reduce eddy current loss. The models were analyzed using 2-D and 3-D finite element analysis. The torque, torque ripple and eddy current loss were compared in both models according to the materials used, including Sm2Co17, NdFeBs (N42SH, N48SH). Also, the structural stability of the pole piece structure was investigated by forced vibration analysis. Critical speed results from rotordynamics analysis are also presented.

Development of Interior Permanent Magnet Motors with Concentrated Windings for Reducing Magnet Eddy Current Loss

2009 ◽  
Vol 129 (11) ◽  
pp. 1022-1029 ◽  
Author(s):  
Katsumi Yamazaki ◽  
Yuji Kanou ◽  
Yu Fukushima ◽  
Shunji Ohki ◽  
Akira Nezu ◽  
...  
Keyword(s):  
Permanent Magnet ◽  
Eddy Current ◽  
Eddy Current Loss ◽  
Permanent Magnet Motors ◽  
Current Loss ◽  
Interior Permanent Magnet
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