Influence of the Welding Process on the Performance of Slotless PM Motors With SiFe and NiFe Stator Laminations

The influence of the welding process during the manufacturing of small slotless permanent-magnet synchronous machines (PMSMs) is studied in this paper. The focus lies on the change of the magnetic properties in high-quality silicon-iron (SiFe) and nickel-iron (NiFe) electrical steel sheets with thicknesses of 0.1 and 0.2 mm. It is shown that the welding process changes the magnetic material properties significantly and increases the specific iron losses. Experimental results are provided for magnetic flux densities up to 1.5 T and frequencies from quasi-static to 200 Hz. The obtained measurement data is afterward used in finite-element method (FEM) simulations to investigate the influence of the magnetic property changes on the motor performance, particularly with regard to stator core losses.

[1]  W. Roshen,et al.  Iron Loss Model for Permanent-Magnet Synchronous Motors , 2007, IEEE Transactions on Magnetics.

[2]  B. C. Mecrow,et al.  Calculation of iron loss in electrical generators using finite element analysis , 2011, 2011 IEEE International Electric Machines & Drives Conference (IEMDC).

[3]  Hans-Peter Nee,et al.  Development and Testing of a Measurement Device for Prediction of Stator Core Quality , 1996 .

[4]  A. Cavagnino,et al.  Analytical method for determining the damaged area width in magnetic materials due to punching process , 2011, IECON 2011 - 37th Annual Conference of the IEEE Industrial Electronics Society.

[5]  Seyed Ali Mousavi,et al.  Electromagnetic Modelling of Power Transformers with DC Magnetization , 2012 .

[6]  Kay Hameyer,et al.  Influence of the manufacturing process on the magnetic properties of electrical stel in E-Cores , 2003 .

[7]  R. Billardon,et al.  Residual stresses in punched laminations: Phenomenological analysis and influence on the magnetic behavior of electrical steels , 2003 .

[8]  J. Soulard,et al.  Incorporating Lamination Processing and Component Manufacturing in Electrical Machine Design Tools , 2007, 2007 IEEE Industry Applications Annual Meeting.

[9]  T. Meydan,et al.  Use of novel adaptive digital feedback for magnetic measurements under controlled magnetizing conditions , 2005, IEEE Transactions on Magnetics.

[10]  Anthony John Moses,et al.  Aspects of the cut-edge effect stress on the power loss and flux density distribution in electrical steel sheets , 2000 .

[11]  S. Tumański.  Handbook of Magnetic Measurements , 2011 .

[12]  A. Schoppa,et al.  Influence of the manufacturing process on the magnetic properties of non-oriented electrical steels , 2000 .

[13]  Oskar Wallmark,et al.  Analysis of Axial Leakage in High-Speed Slotless PM Motors for Industrial Hand Tools , 2008, 2008 IEEE Industry Applications Society Annual Meeting.

[14]  Nelson Sadowski,et al.  Comparison of iron losses evaluations by different testing procedures , 2010, The XIX International Conference on Electrical Machines - ICEM 2010.

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

[16]  L. Ferraris,et al.  No tooling cost process for induction motors energy efficiency improvements , 2004, Conference Record of the 2004 IEEE Industry Applications Conference, 2004. 39th IAS Annual Meeting..

[17]  P. Pillay,et al.  Advanced testing and modeling of magnetic materials including a new method of core loss separation for electrical machines , 2012, 2011 IEEE Energy Conversion Congress and Exposition.

[18]  Masato Enokizono,et al.  Evaluation of the Magnetic Properties of the Rotating Machines for the Building Factor Clarification , 2011 .

[19]  F. Fiorillo,et al.  Measurement and characterization of magnetic materials , 2004 .

[20]  A. Schoppa,et al.  Influence of the cutting process on the magnetic properties of non-oriented electrical steels , 2000 .

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

[22]  N. Alatawneh,et al.  The impact of rotating field on core loss estimation in electrical machine laminations , 2012, 2012 IEEE Energy Conversion Congress and Exposition (ECCE).