Analysis and optimization of EMF waveform of a novel axial field flux-switching permanent magnet machine

Axial field flux-switching permanent magnet motor is a novel PM machine of doubly-salient structure, with magnets and concentrated windings in the stator. This novel machine is suitable for electric vehicle because of its short axial length, high power and torque density. A typical 3-phase 12/10-pole AFFSPM motor is designed and prototyped. In order to gain sinusoidal back-EMF waveform, the influence of the design parameters, such as the stator tooth width, the magnet size, the stator yoke thickness, the stator tooth shape, the rotor pole width, and the rotor pole shape, on the back-EMF is investigated based on 3D FE analysis. It shows that the harmonics of back-EMF can be significantly reduced and the waveform of the back-EMF is sinusoidal by optimizing the stator tooth shape, the rotor pole width and shape. The experiments are conducted and the results are in agreement with the theoretical analysis.

[1]  R. Deodhar,et al.  A novel E-core flux-switching PM brushless AC machine , 2010, 2010 IEEE Energy Conversion Congress and Exposition.

[2]  Jiabin Wang,et al.  Design Considerations for Tubular Flux-Switching Permanent Magnet Machines , 2008, IEEE Transactions on Magnetics.

[3]  G. Jewell,et al.  Proximity Loss Study In High Speed Flux-Switching Permanent Magnet Machine , 2009, IEEE Transactions on Magnetics.

[4]  Geraint W. Jewell,et al.  Multiphase Flux-Switching Permanent-Magnet Brushless Machine for Aerospace Application , 2008, IEEE Transactions on Industry Applications.

[5]  D. Howe,et al.  Analysis of electromagnetic performance of flux-switching permanent-magnet Machines by nonlinear adaptive lumped parameter magnetic circuit model , 2005, IEEE Transactions on Magnetics.

[6]  Jian-Xin Shen,et al.  A New Method for Reduction of Detent Force in Permanent Magnet Flux-Switching Linear Motors , 2009, IEEE Transactions on Magnetics.

[7]  S. E. Rauch,et al.  Design Principles of Flux-Switch Alternators [includes discussion] , 1955, Transactions of the American Institute of Electrical Engineers. Part III: Power Apparatus and Systems.

[8]  Z. Zhu,et al.  Winding Configurations and Optimal Stator and Rotor Pole Combination of Flux-Switching PM Brushless AC Machines , 2010, IEEE Transactions on Energy Conversion.

[9]  E. Hoang,et al.  A new structure of a switching flux synchronous polyphased machine with hybrid excitation , 2007, 2007 European Conference on Power Electronics and Applications.

[10]  D. Howe,et al.  Investigation of iron loss in flux-switching PM machines , 2008 .

[11]  Z.Q. Zhu,et al.  Analysis and Optimization of Back EMF Waveform of a Flux-Switching Permanent Magnet Motor , 2008, IEEE Transactions on Energy Conversion.

[12]  D. Howe,et al.  Investigation of end effect in permanent magnet brushless machines having magnets on the stator , 2006 .

[13]  R. Deodhar,et al.  Influence of PWM on the Proximity Loss in Permanent-Magnet Brushless AC Machines , 2009 .

[14]  D. Howe,et al.  Analysis and reduction of magnet eddy current loss in flux-switching permanent magnet machines , 2008 .