Efficient finite element based rotor loss calculation for permanent magnet synchronous machines

This paper proposes a finite element based method to compute rotor eddy-current losses in surface mounted PM machines. A surface current density boundary condition, obtained from static solutions of the full machine geometry, is applied to a model containing only the rotor. Unlike other similar methods, this method is not based on the assumption of resistively limited eddy-currents; it can account for shielding effects in the rotor. The performance under various conditions is demonstrated with a number of hypothetical machines, showing the proposed method underestimates the rotor losses by up to 16%, but also reduces the computation time required by a factor 2-20, compared to transient simulations with the full geometry.

[1]  Dan M. Ionel,et al.  Calculation of magnet losses in concentrated-winding permanent magnet synchronous machines using a Computationally Efficient - Finite Element method , 2012, ECCE 2012.

[2]  A. Tessarolo,et al.  Use of Time-Harmonic FE Analysis to compute rotor eddy-current losses in synchronous machines subject to distorted stator currents , 2012, 2012 XXth International Conference on Electrical Machines.

[3]  D. Staton,et al.  Analytical Model for Predicting Magnet Loss of Surface-Mounted Permanent Magnet Machines Accounting for Slotting Effect and Load , 2012, IEEE Transactions on Magnetics.

[4]  K Yamazaki,et al.  Effect of eddy-current loss reduction by magnet segmentation in synchronous motors with concentrated windings , 2009, 2009 International Conference on Electrical Machines and Systems.

[5]  J.A. Ferreira,et al.  Comparison of analytical and Finite Element calculation of eddy-current losses in PM machines , 2010, The XIX International Conference on Electrical Machines - ICEM 2010.

[6]  K. Yamazaki,et al.  Reduction of Magnet Eddy-Current Loss in Interior Permanent-Magnet Motors With Concentrated Windings , 2010, IEEE Transactions on Industry Applications.

[7]  Nigel Schofield,et al.  Parasitic rotor losses in a brushless permanent magnet traction machine , 1997 .

[8]  Dan M. Ionel,et al.  Multi-Objective Tradeoffs in the Design Optimization of a Brushless Permanent-Magnet Machine With Fractional-Slot Concentrated Windings , 2013, IEEE Transactions on Industry Applications.

[9]  Fang Deng.  Commutation-caused eddy-current losses in permanent-magnet brushless DC motors , 1997 .

[10]  Ingo Hahn,et al.  Kriging-Assisted Multi-Objective Particle Swarm Optimization of permanent magnet synchronous machine for hybrid and electric cars , 2013, 2013 International Electric Machines & Drives Conference.

[11]  C. E. Nino-Baron,et al.  Iron and Magnet Losses and Torque Calculation of Interior Permanent Magnet Synchronous Machines Using Magnetic Equivalent Circuit , 2010, IEEE Transactions on Magnetics.

[12]  Nigel Schofield,et al.  Improved analytical modelling of rotor eddy current loss in brushless machines equipped with surface-mounted permanent magnets , 2004 .

[13]  P. Rafajdus,et al.  Harmonic Loss Calculation in Rotor Surface Permanent Magnets—New Analytic Approach , 2012, IEEE Transactions on Magnetics.

[14]  K. Yamazaki,et al.  Rotor Loss Analysis of Interior Permanent Magnet Motors Using Combination of 2-D and 3-D Finite Element Method , 2009, IEEE Transactions on Magnetics.

[15]  Dan M. Ionel,et al.  Modeling and Parametric Design of Permanent-Magnet AC Machines Using Computationally Efficient Finite-Element Analysis , 2012, IEEE Transactions on Industrial Electronics.