Evaluation and analysis of iron losses in electrical machines using the rain-flow method

2000 ◽  
Vol 36 (4) ◽  
pp. 1923-1926 ◽  
Author(s):  
N. Sadowski ◽  
M. Lajoie-Mazenc ◽  
J.P.A. Bastos ◽  
M.V. Ferreira da Luz ◽  
P. Kuo-Peng
1998 ◽  
Vol 36 (7-8) ◽  
pp. 699-709 ◽  
Author(s):  
L.R. Dupré ◽  
R. Van Keer ◽  
J.A.A. Melkebeek

1991 ◽  
Vol 27 (6) ◽  
pp. 5007-5009 ◽  
Author(s):  
G. Bertotti ◽  
A. Boglietti ◽  
M. Chiampi ◽  
D. Chiarabaglio ◽  
F. Fiorillo ◽  
...  

2002 ◽  
Vol 38 (2) ◽  
pp. 805-808 ◽  
Author(s):  
O. Bottauscio ◽  
A. Canova ◽  
M. Chiampi ◽  
M. Repetto

2021 ◽  
Vol 23 (6) ◽  
pp. 481-486
Author(s):  
K. Darques ◽  
A. Tounzi ◽  
A. Benabou ◽  
S. Shihab ◽  
J. Korecki ◽  
...  

In high power electrical machines, the leakage magnetic flux due to end windings induces eddy currents in clamping devices. However, it is quite difficult to quantify these losses. In order to study the effect of different clamping materials and the impact of the magnetization direction, an experimental mock-up composed of a stator and a clamping plate has been developed. An axial coil generates a circumferential magnetic flux in the stator core at different frequencies. Eddy current losses in the clamping plates are deduced from a power balance by subtracting Joule losses and iron losses from the total measured losses. Iron losses are deduced from 3D FE calculations while the impact of the frequency on B(H) curve is taken into account. Losses in the clamping device are then analyzed depending on experimental parameters.


Author(s):  
Benedikt Schauerte ◽  
Martin Marco Nell ◽  
Tim Brimmers ◽  
Nora Leuning ◽  
Kay Hameyer

Purpose The magnetic characterization of electrical steel is typically examined by measurements under the condition of unidirectional sinusoidal flux density at different magnetization frequencies. A variety of iron loss models were developed and parametrized for these standardized unidirectional iron loss measurements. In the magnetic cross section of rotating electrical machines, the spatial magnetic flux density loci and with them the resulting iron losses vary significantly from these unidirectional cases. For a better recreation of the measured behavior extended iron loss models that consider the effects of rotational magnetization have to be developed and compared to the measured material behavior. The aim of this study is the adaptation, parametrization and validation of an iron loss model considering the spatial flux density loci is presented and validated with measurements of circular and elliptical magnetizations. Design/methodology/approach The proposed iron loss model allows the calculation and separation of the different iron loss components based on the measured iron loss for different spatial magnetization loci. The separation is performed in analogy to the conventional iron loss calculation approach designed for the recreation of the iron losses measured under unidirectional, one-dimensional measurements. The phenomenological behavior for rotating magnetization loci is considered by the formulation of the different iron loss components as a function of the maximum magnetic flux density Bm, axis ratio fAx, angle to the rolling direction (RD) θ and magnetization frequency f. Findings The proposed formulation for the calculation of rotating iron loss is able to recreate the complicated interdependencies between the different iron loss components and the respective spatial magnetic flux loci. The model can be easily implemented in the finite element analysis of rotating electrical machines, leading to good agreement between the theoretically expected behavior and the actual output of the iron loss calculation at different geometric locations in the magnetic cross section of rotating electrical machines. Originality/value Based on conventional one-dimensional iron loss separation approaches and previously performed extensions for rotational magnetization, the terms for the consideration of vectorial unidirectional, elliptical and circular flux density loci are adjusted and compared to the performed rotational measurement. The presented approach for the mathematical formulation of the iron loss model also allows the parametrization of the different iron loss components by unidirectional measurements performed in different directions to the RD on conventional one-dimensional measurement topologies such as the Epstein frames and single sheet testers.


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