Ω Shaped axial-flux permanent-magnet machine for direct-drive applications with constrained shaft height

This contribution investigates an original solution that can be used in the design of AFPM machines, whenever a constrained shaft height requirement penalizes a standard design. The machine is tailored for electrical traction, but the ideas that are set forth are valid for any application with constrained shaft height. Two design solutions are investigated that comply with the constrained shaft height: a standard Torus AFPM machine and an asymmetrically wound Torus machine, named “Ω AFPM” due to the shape of the stator. It is shown that the Ω AFPM machine has lower losses and a higher efficiency. FE simulations and experimental tests on a full-scale prototype confirm the validity of the proposed solution.

[1]  Pascal Brochet,et al.  Design and Optimization of a Nine-Phase Axial-Flux PM Synchronous Generator With Concentrated Winding for Direct-Drive Wind Turbine , 2006 .

[2]  F. Crescimbini,et al.  Application of direct drive wheel motor for fuel cell electric and hybrid electric vehicle propulsion system , 2004, Conference Record of the 2004 IEEE Industry Applications Conference, 2004. 39th IAS Annual Meeting..

[3]  J.A. Tapia,et al.  Design Consideration to Reduce Cogging Torque in Axial Flux Permanent-Magnet Machines , 2007, IEEE Transactions on Magnetics.

[4]  F. Crescimbini,et al.  Experimental study on reducing cogging torque and core power loss in axial-flux permanent-magnet machines with slotted winding , 2002, Conference Record of the 2002 IEEE Industry Applications Conference. 37th IAS Annual Meeting (Cat. No.02CH37344).

[5]  W. Fei,et al.  Design and performance analysis of a high-speed air-cored axial-flux permanent-magnet generator with circular magnets and coils , 2009, 2009 IEEE International Electric Machines and Drives Conference.

[6]  Fabio Giulii Capponi,et al.  Axial-Flux Permanent-Magnet Generator for Induction Heating Gensets , 2010, IEEE Transactions on Industrial Electronics.

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

[8]  Thomas A. Lipo,et al.  Torque quality and comparison of internal and external rotor axial flux surface-magnet disc machines , 2006, IEEE Transactions on Industrial Electronics.

[9]  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.

[10]  Thomas A. Lipo,et al.  Torque quality and comparison of internal and external rotor axial flux surface-magnet disc machines , 2001, IECON'01. 27th Annual Conference of the IEEE Industrial Electronics Society (Cat. No.37243).

[11]  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.

[12]  M.A. Valenzuela,et al.  Cogging Torque Reduction in an Axial Flux PM Machine via Stator Slot Displacement and Skewing , 2007, IEEE Transactions on Industry Applications.

[13]  I. Csáki,et al.  Test Results of a Compact Disk-Type Motor/Generator Unit With Superconducting Bearings for Flywheel Energy Storage Systems With Ultra-Low Idling Losses , 2011, IEEE Transactions on Applied Superconductivity.

[14]  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.

[15]  Weizhong Fei,et al.  Rotor Integrity Design for a High-Speed Modular Air-Cored Axial-Flux Permanent-Magnet Generator , 2011, IEEE Transactions on Industrial Electronics.

[16]  F. Crescimbini,et al.  Modular, axial-flux, permanent-magnet motor for ship propulsion drives , 1997 .

[17]  S. Brisset,et al.  Design and Optimization of a Nine-Phase Axial-Flux PM Synchronous Generator With Concentrated Winding for Direct-Drive Wind Turbine , 2006, IEEE Transactions on Industry Applications.

[18]  Z.Q. Zhu,et al.  Minimization of Cogging Torque in Axial-Flux Permanent-Magnet Machines: Design Concepts , 2007, IEEE Transactions on Magnetics.

[19]  Mi-Ching Tsai,et al.  Design of a Miniature Axial-Flux Spindle Motor With Rhomboidal PCB Winding , 2006, IEEE Transactions on Magnetics.

[20]  Chris Mi,et al.  Hybrid Electric Vehicles: Principles and Applications with Practical Perspectives , 2011 .

[21]  F. Crescimbini,et al.  Experimental study on reducing cogging torque and core power loss in axial-flux permanent-magnet machines with slotted winding , 2002 .