Parasitic Currents in Stray Paths of Some Topologies of YASA AFPM Machines: Trend With Machine Size

In some topologies of yokeless and segmented armature (YASA) axial flux permanent-magnet (AFPM) machines, the particular frame structure required to fasten floating teeth can originate stray paths where parasitic currents may circulate. This paper investigates how the amplitude of these currents and the related additional Joule losses depend on the machine size. Reference is made to wind energy generators, rated from some tens of kilowatts up to a few megawatts. The developed model is mainly based on wind turbine basic data of vendor data sheets, and on the quantities evaluated and tested in two YASA AFPM prototypes, rated 50 and 200 kW.

[1]  T. Lipo,et al.  A Novel Dual-Stator Axial-Flux Spoke-Type Permanent Magnet Vernier Machine for Direct-Drive Applications , 2014, IEEE Transactions on Magnetics.

[2]  Jun-Hong Park,et al.  Characteristic Comparison Between the Spiral and the Lamination Stator in Axial Field Slotless Machines , 2009, IEEE Transactions on Magnetics.

[3]  Matteo Felice Iacchetti,et al.  Parasitic Currents in Structural Paths of YASA Axial Flux PM Machines: Estimation and Tests , 2016, IEEE Transactions on Energy Conversion.

[4]  Mohamed Benbouzid,et al.  Design and Performance Analysis of Double Stator Axial Flux PM Generator for Rim Driven Marine Current Turbines , 2016, IEEE Journal of Oceanic Engineering.

[5]  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.

[6]  Matteo Felice Iacchetti,et al.  Axial Flux PM Machines With Concentrated Armature Windings: Design Analysis and Test Validation of Wind Energy Generators , 2011, IEEE Transactions on Industrial Electronics.

[7]  Peter Sergeant,et al.  Optimized Design Considering the Mass Influence of an Axial Flux Permanent-Magnet Synchronous Generator With Concentrated Pole Windings , 2010, IEEE Transactions on Magnetics.

[8]  Matteo Felice Iacchetti,et al.  Analysis and Test of Diode Rectifier Solutions in Grid-Connected Wind Energy Conversion Systems Employing Modular Permanent-Magnet Synchronous Generators , 2012, IEEE Transactions on Industrial Electronics.

[9]  A. Di Gerlando,et al.  Design criteria of axial flux PM machines for direct drive wind energy generation , 2010, The XIX International Conference on Electrical Machines - ICEM 2010.

[10]  Peter Sergeant,et al.  Performance and implementation issues considering the use of thin laminated steel sheets in segmented armature axial-flux PM machines , 2014, 2014 International Conference on Electrical Machines (ICEM).

[11]  Peter Sergeant,et al.  Axial-Flux PM Machines With Variable Air Gap , 2014, IEEE Transactions on Industrial Electronics.

[12]  Hew Wooi Ping,et al.  A Comprehensive Review of Axial-Flux Permanent-Magnet Machines , 2014, Canadian Journal of Electrical and Computer Engineering.

[13]  T.J. Woolmer,et al.  Analysis of the Yokeless And Segmented Armature Machine , 2007, 2007 IEEE International Electric Machines & Drives Conference.

[14]  Yee-Pien Yang,et al.  Multi-objective optimal design of an axial-flux permanent-magnet wheel motor for electric scooters , 2014 .

[15]  Jacek F. Gieras,et al.  Axial Flux Permanent Magnet Brushless Machines , 2005 .

[16]  T. Lipo,et al.  AXIAL FLUX PERMANENT MAGNET DISC MACHINES: A REVIEW , 2004 .

[17]  Satoshi Ogasawara,et al.  A ferrite permanent magnet axial gap motor with segmented rotor structure for the next generation hybrid vehicle , 2010, The XIX International Conference on Electrical Machines - ICEM 2010.

[18]  P. Sergeant,et al.  Evaluation of a Simple Lamination Stacking Method for the Teeth of an Axial Flux Permanent-Magnet Synchronous Machine With Concentrated Stator Windings , 2012, IEEE Transactions on Magnetics.

[19]  F. Caricchi,et al.  Fractional-slot concentrated-winding axial-flux permanent-magnet machine with tooth-wound coils , 2012, 2012 XXth International Conference on Electrical Machines.

[20]  Bo Zhang,et al.  Mechanical construction and analysis of an axial flux segmented armature torus machine , 2014, 2014 International Conference on Electrical Machines (ICEM).

[21]  Thomas A. Lipo,et al.  Comparative Study on Novel Dual Stator Radial Flux and Axial Flux Permanent Magnet Motors With Ferrite Magnets for Traction Application , 2014, IEEE Transactions on Magnetics.

[22]  Matteo Felice Iacchetti,et al.  Analysis of stray paths for parasitic currents in some topologies of Yokeless and Segmented Armature Axial Flux PM Machines , 2014, 2014 International Conference on Electrical Machines (ICEM).

[23]  P. Barendse,et al.  A simple core structure for small axial-flux PMSGs , 2011, 2011 IEEE International Electric Machines & Drives Conference (IEMDC).

[24]  Seok-Myeong Jang,et al.  Characteristic Analysis on Axial Flux Permanent Magnet Synchronous Generator Considering Wind Turbine Characteristics According to Wind Speed for Small-Scale Power Application , 2012, IEEE Transactions on Magnetics.

[25]  Giulio De Donato,et al.  Ω Shaped axial-flux permanent-magnet machine for direct-drive applications with constrained shaft height , 2013, 2013 IEEE Energy Conversion Congress and Exposition.

[26]  Claude Marchand,et al.  3-D–2-D Dynamic Magnetic Modeling of an Axial Flux Permanent Magnet Motor With Soft Magnetic Composites for Hybrid Electric Vehicles , 2014, IEEE Transactions on Magnetics.

[27]  F. Caricchi,et al.  Recent Advances in Axial-Flux Permanent-Magnet Machine Technology , 2012, IEEE Transactions on Industry Applications.

[28]  W. Fei,et al.  A new axial flux permanent magnet Segmented-Armature-Torus machine for in-wheel direct drive applications , 2008, 2008 IEEE Power Electronics Specialists Conference.

[29]  Thomas A. Lipo,et al.  A Novel Dual-Rotor, Axial Field, Fault-Tolerant Flux-Switching Permanent Magnet Machine With High-Torque Performance , 2015, IEEE Transactions on Magnetics.