Research on an Axial Flux PMSM with Radially Sliding Permanent Magnets

Axial flux permanent-magnet synchronous machines (PMSMs) are very suitable candidates for the power train of electric vehicles (EVs) due to high power density and high efficiency. This paper researches an axial flux PMSM with radially sliding permanent magnets (PMs) to fulfill field-weakening control. The field weakening principle and the structure of this kind of axial flux PMSM by mechanical method of sliding PMs are proposed and analyzed. The influences of radially sliding PMs on magnetic flux density distribution, inductance, flux linkage and torque are analyzed and discussed based on 3D finite element method (FEM). The field weakening capabilities by mechanical method and electrical method are compared. The field weakening capability of the machine can be much improved by the optimized combination of the two methods, which is very satisfying for EV drive application. The forces on the PMs are analyzed and calculated. The hysteretic characteristics caused by the friction of the PMs are investigated, which provide useful reference for designing this kind of machine.

[1]  F. Caricchi,et al.  Analysis and comparison of a speed-dependant and a torque-dependant mechanical device for wide constant power speed range in AFPM starter/alternators , 2006, IEEE Transactions on Power Electronics.

[2]  Jing Zhao,et al.  Research on an axial-axial flux compound-structure PMSM with varying air gap to fulfill field-weakening control , 2014, 2014 17th International Conference on Electrical Machines and Systems (ICEMS).

[3]  Zi-Qiang Zhu,et al.  Electrical Machines and Drives for Electric, Hybrid, and Fuel Cell Vehicles , 2007, Proceedings of the IEEE.

[4]  P. C. Coles,et al.  Novel axial flux machine for aircraft drive: design and modeling , 2002 .

[5]  T.A. Lipo,et al.  A new axial flux surface mounted permanent magnet machine capable of field control , 2002, Conference Record of the 2002 IEEE Industry Applications Conference. 37th IAS Annual Meeting (Cat. No.02CH37344).

[6]  Seung-Ki Sul,et al.  Design and Control of an Axial-Flux Machine for a Wide Flux-Weakening Operation Region , 2007, IEEE Transactions on Industry Applications.

[7]  Yee-Pien Yang,et al.  Design and application of axial-flux permanent magnet wheel motors for an electric vehicle , 2009, AFRICON 2009.

[8]  Kais Atallah,et al.  Design Optimization of a Surface-Mounted Permanent-Magnet Motor With Concentrated Windings for Electric Vehicle Applications , 2013, IEEE Transactions on Vehicular Technology.

[9]  Jing Zhao,et al.  Field weakening capability investigation of an axial flux permanent-magnet synchronous machine with radially sliding permanent magnets used for electric vehicles , 2012 .

[10]  Hui Yang,et al.  Novel Flux-Regulatable Dual-Magnet Vernier Memory Machines for Electric Vehicle Propulsion , 2014, IEEE Transactions on Applied Superconductivity.

[11]  Thomas A. Lipo,et al.  Design, Analysis, and Control of a Hybrid Field-Controlled Axial-Flux Permanent-Magnet Motor , 2010, IEEE Transactions on Industrial Electronics.

[12]  R. Wallace,et al.  Design and Test of an Axial Flux Permanent-Magnet Machine With Field Control Capability , 2008, IEEE Transactions on Magnetics.

[13]  Jiabin Wang,et al.  Six-Phase Fractional-Slot-per-Pole-per-Phase Permanent-Magnet Machines With Low Space Harmonics for Electric Vehicle Application , 2014, IEEE Transactions on Industry Applications.

[14]  K. T. Chau,et al.  A Magnetless Axial-Flux Machine for Range-Extended Electric Vehicles , 2014 .

[15]  Xiao Feng,et al.  Design of direct-drive axial flux permanent magnet in-wheel machine for electric vehicle , 2011, 2011 International Conference on Electrical Machines and Systems.

[16]  Yon-Do Chun,et al.  Cogging torque reduction in a novel axial flux PM motor , 2006, International Symposium on Power Electronics, Electrical Drives, Automation and Motion, 2006. SPEEDAM 2006..

[17]  F. Crescimbini,et al.  Axial-flux permanent magnet motor for direct-drive elevator systems without machine room , 2000, Conference Record of the 2000 IEEE Industry Applications Conference. Thirty-Fifth IAS Annual Meeting and World Conference on Industrial Applications of Electrical Energy (Cat. No.00CH37129).

[18]  D. Howe,et al.  Influence of soft magnetic materials on the design and performance of tubular permanent magnet machines , 2005, IEEE Transactions on Magnetics.

[19]  Oliver Winter,et al.  Design and loss assessment of air cored axial flux permanent magnet machines , 2013, 2013 International Electric Machines & Drives Conference.

[20]  Yee-Pien Yang,et al.  Optimal Design and Control of a Wheel Motor for Electric Passenger Cars , 2005, IEEE Transactions on Magnetics.

[21]  Fabrizio Marignetti,et al.  Electromagnetic Analysis of Axial-Flux Permanent Magnet Synchronous Machines With Fractional Windings With Experimental Validation , 2012, IEEE Transactions on Industrial Electronics.

[22]  Matteo Felice Iacchetti,et al.  Effects of Manufacturing Imperfections in Concentrated Coil Axial Flux PM Machines: Evaluation and Tests , 2014, IEEE Transactions on Industrial Electronics.

[23]  Shuangxia Niu,et al.  Design and Analysis of a Novel Axial-Flux Electric Machine , 2011, IEEE Transactions on Magnetics.

[24]  Sung Chul Oh,et al.  Test and simulation of axial flux-motor characteristics for hybrid electric vehicles , 2004, IEEE Transactions on Vehicular Technology.

[25]  D. Howe,et al.  Calculation of d- and q-axis inductances of PM brushless ac machines accounting for skew , 2005, IEEE Transactions on Magnetics.

[26]  Wei Hua,et al.  Analysis of Two Novel Five-Phase Hybrid-Excitation Flux-Switching Machines for Electric Vehicles , 2014, IEEE Transactions on Magnetics.

[27]  Longya Xu,et al.  Low-Cost Ferrite PM-Assisted Synchronous Reluctance Machine for Electric Vehicles , 2014, IEEE Transactions on Industrial Electronics.

[28]  M. Ardebili,et al.  Analysis and comparison of axial-flux permanent-magnet brushless-DC machines with fractional-slot concentrated-windings , 2013, 4th Annual International Power Electronics, Drive Systems and Technologies Conference.

[29]  H. Koharagi,et al.  Evaluation of experimental permanent-magnet brushless motor utilizing new magnetic material for stator core teeth , 2005, IEEE Transactions on Magnetics.

[30]  K.R. Rajagopal,et al.  Design of a compact winding for an axial-flux permanent-magnet brushless DC motor used in an electric two-wheeler , 2004, IEEE Transactions on Magnetics.

[31]  Shao Zhang,et al.  A Novel Axial Flux Permanent-Magnet Machine for Flywheel Energy Storage System: Design and Analysis , 2011, IEEE Transactions on Industrial Electronics.