Modeling of Eddy-Current Losses of Welded Laminated Electrical Steels

With the implementation of more stringent emissions standards, energy conversion efficiency in motor and transformer has drawn increasing attention. In this study, an analytical model to estimate the eddy-current losses of the welded electrical steel laminations has been developed. A numerical model has been developed to visualize the magnetic flux density, eddy-current density, and loss. The eddy-current losses obtained from the analytical model were in good agreement with those from the numerical model. Effects of weld bead size, sheet thickness, operating frequency, and magnetic flux density on the eddy-current losses have been quantitatively investigated. The results showed that the eddy-current losses of the welded laminations increased with the increase of the weld bead radius. Meanwhile, the eddy-current losses of the thinner laminations were much more sensitive to the welding process, especially at high operating frequency and high magnetic flux density. This work provided a quantitative model to calculate the eddy-current losses of the welded laminations.

[1]  J. Bergmann,et al.  Laser welding of electrical steel stacks investigation of the weldability , 2014, 2014 4th International Electric Drives Production Conference (EDPC).

[2]  Li Sun,et al.  Iron Loss Analysis of Doubly Salient Brushless DC Generators , 2015, IEEE Transactions on Industrial Electronics.

[3]  Tamás Markovits,et al.  Edge welding of laminated steel structure by pulsed Nd:YAG laser , 2010 .

[4]  F. Anayi,et al.  Evaluation of Loss Generated by Edge Burrs in Electrical Steels , 2016, IEEE Transactions on Magnetics.

[6]  Elias G. Strangas,et al.  A Device for the Study of Electrical Steel Losses in Stator Lamination Stacks , 2014, IEEE Transactions on Industrial Electronics.

[7]  Michael J. Melfi,et al.  Ultra-Efficient and Power Dense Electric Motors for U. S. Industry , 2013 .

[8]  Ran Yi,et al.  Analyses on Electromagnetic and Temperature Fields of Superhigh-Speed Permanent-Magnet Generator With Different Sleeve Materials , 2014, IEEE Transactions on Industrial Electronics.

[9]  Daniel Roger,et al.  Contribution to the Study of Losses Generated by Interlaminar Short-Circuits , 2012, IEEE Transactions on Magnetics.

[10]  Weili Li,et al.  Numerical Calculation and Analysis of Three-Dimensional Transient Electromagnetic Field in the End Region of Large Water–Hydrogen–Hydrogen Cooled Turbogenerator , 2014, IEEE Transactions on Industrial Electronics.

[11]  Hamed Hamzehbahmani,et al.  Eddy Current Loss Estimation of Edge Burr-Affected Magnetic Laminations Based on Equivalent Electrical Network—Part II: Analytical Modeling and Experimental Results , 2014, IEEE Transactions on Power Delivery.

[12]  Sadegh Vaez-Zadeh,et al.  Analytical Modeling and Analysis of Axial-Flux Interior Permanent-Magnet Couplers , 2014, IEEE Transactions on Industrial Electronics.

[13]  Gui-Yu Zhou,et al.  Influence of interlocking dowels on motor core loss , 2016 .

[14]  Marian K. Kazimierczuk,et al.  Eddy-current power loss in laminated iron cores , 2001, ISCAS 2001. The 2001 IEEE International Symposium on Circuits and Systems (Cat. No.01CH37196).

[15]  Ali Emadi,et al.  Loss and Efficiency Analysis of Switched Reluctance Machines Using a New Calculation Method , 2015, IEEE Transactions on Industrial Electronics.

[16]  Andreas Krings,et al.  Overview and Comparison of Iron Loss Models for Electrical Machines , 2010 .

[17]  Yunkai Huang,et al.  Numerical Analysis of 3D Eddy Current Fields in Laminated Media Under Various Frequencies , 2012, IEEE Transactions on Magnetics.

[18]  A. Schoppa,et al.  Influence of welding and sticking of laminations on the magnetic properties of non-oriented electrical steels , 2003 .

[19]  Uwe Schäfer,et al.  Optimized Design of High-Speed Induction Motors in Respect of the Electrical Steel Grade , 2010, IEEE Transactions on Industrial Electronics.

[20]  E. Lamprecht,et al.  Investigations of eddy current losses in laminated cores due to the impact of various stacking processes , 2012, 2012 2nd International Electric Drives Production Conference (EDPC).

[21]  Hamed Hamzehbahmani,et al.  Eddy Current Loss Estimation of Edge Burr-Affected Magnetic Laminations Based on Equivalent Electrical Network—Part I: Fundamental Concepts and FEM Modeling , 2014, IEEE Transactions on Power Delivery.

[22]  Alexander b. Russell.  A Treatise on the Theory of Alternating Currents , 2010 .

[23]  A. Muetze,et al.  Measurement of Stator Core Magnetic Degradation During the Manufacturing Process , 2012, IEEE Transactions on Industry Applications.

[24]  Hong Li,et al.  Core loss analysis of buck converter under chaotic PWM based on ANSYS , 2016, 2016 Asia-Pacific International Symposium on Electromagnetic Compatibility (APEMC).

[25]  C. Graham.  Physical origin of losses in conducting ferromagnetic materials (invited) , 1982 .

[26]  Li Yong,et al.  Influence of Copper Screen Thickness on Three-Dimensional Electromagnetic Field and Eddy Current Losses of Metal Parts in End Region of Large Water-Hydrogen–Hydrogen-Cooled Turbogenerator , 2013 .

[27]  A. Honda,et al.  Nonoriented electrical steel sheet with low iron loss for high-efficiency motor cores , 1999 .

[28]  Oskar Wallmark,et al.  Influence of the Welding Process on the Performance of Slotless PM Motors With SiFe and NiFe Stator Laminations , 2014, IEEE Transactions on Industry Applications.

[29]  Paul Handgruber,et al.  Evaluation of interlaminar eddy currents in induction machines , 2013, IECON 2013 - 39th Annual Conference of the IEEE Industrial Electronics Society.