Iron loss in FSPMM: 2D FEA-based comparative study between single and double-layer topologies

Purpose – The purpose of this paper is to compare the study between two topologies of fractional-slot permanent-magnet machines such that: double-layer topology and single-layer one. The comparison considers the assessment of the iron loss in the laminated cores of the magnetic circuit as well as in the permanent magnets (PMs) for constant torque and flux weakening ranges. Design/methodology/approach – The investigation of the hysteresis and eddy-current loss has been carried out using 2D transient FEA models. Findings – It has been found that the stator iron losses are almost the same for both topologies. Whereas, the single-layer topology is penalized by higher iron loss especially the eddy-current ones taking place in the PMs. This is due to their denser harmonic content of the armature air gap MMF spatial repartition. Originality/value – The analysis of the iron loss maps in different parts of each machine including stator and rotor laminations as well as the PMs, in one hand, and the investigation of...

[1]  Y. Amara,et al.  Analytical prediction of eddy-current loss in modular tubular permanent-magnet machines , 2005, IEEE Transactions on Energy Conversion.

[2]  Polinder,et al.  Eddy-current losses in the solid back-iron of permanent magnet machines with concentrated fractional pitch windings , 1988 .

[3]  N. Bianchi,et al.  Impact of the Rotor Yoke Geometry on Rotor Losses in Permanent-Magnet Machines , 2010, IEEE Transactions on Industry Applications.

[4]  K. Yamazaki,et al.  Loss Analysis of Permanent-Magnet Motors With Concentrated Windings—Variation of Magnet Eddy-Current Loss Due to Stator and Rotor Shapes , 2009 .

[5]  Rukmi Dutta,et al.  ANALYSIS AND EXPERIMENTAL VERIFICATION OF LOSSES IN A CONCENTRATED WOUND INTERIOR PERMANENT MAGNET MACHINE , 2013 .

[6]  D. Staton,et al.  Analytical Modeling and Analysis of Open-Circuit Magnet Loss in Surface-Mounted Permanent-Magnet Machines , 2012, IEEE Transactions on Magnetics.

[7]  S Bolognani,et al.  An Overview of Rotor Losses Determination in Three-Phase Fractional-Slot PM Machines , 2010, IEEE Transactions on Industry Applications.

[8]  D. Howe,et al.  Stator iron loss of tubular permanent magnet machines , 2004, Conference Record of the 2004 IEEE Industry Applications Conference, 2004. 39th IAS Annual Meeting..

[9]  N. Bianchi,et al.  Rotor Losses Measurements in an Axial Flux Permanent Magnet Machine , 2011, IEEE Transactions on Energy Conversion.

[10]  N. Bianchi,et al.  Impact of MMF Space Harmonic on Rotor Losses in Fractional-Slot Permanent-Magnet Machines , 2009, IEEE Transactions on Energy Conversion.

[11]  Thomas M. Jahns,et al.  Experimental verification of optimal flux weakening in surface PM machines using concentrated windings , 2005 .

[12]  A. Masmoudi.  FEA-based investigation of the iron loss of fractional slot PM machines under flux weakening operation , 2013, 2013 Eighth International Conference and Exhibition on Ecological Vehicles and Renewable Energies (EVER).

[13]  M. Nakano,et al.  A study on eddy-current losses in rotors of surface permanent magnet synchronous machines , 2004, Conference Record of the 2004 IEEE Industry Applications Conference, 2004. 39th IAS Annual Meeting..

[14]  Ayman M. El-Refaie,et al.  Fractional-Slot Concentrated-Windings Synchronous Permanent Magnet Machines: Opportunities and Challenges , 2010, IEEE Transactions on Industrial Electronics.

[15]  D. Stone,et al.  Rotor loss in permanent-magnet brushless AC machines , 2000 .

[16]  R. Dutta,et al.  Experimental verification of core and magnet losses in a concentrated wound IPM machine with V-shaped magnets used in field weakening applications , 2011, 2011 IEEE International Electric Machines & Drives Conference (IEMDC).