Comparison of Concentrated Winding Permanent Magnet Motors With Embedded and Surface-Mounted Rotor Magnets

This paper addresses the torque production and losses of concentrated winding permanent magnet motors. These synchronous motors having either semi-closed slots or open slots with two different rotor structures are studied. The rotors have either embedded magnets or surface magnets. Embedded magnet rotors are in some cases easier to manufacture than surface magnet rotors, and therefore, it was in the authors' interest to study and compare these two basic constructions. In open slot concentrated winding motors, it is possible to use prefabricated coils, which leads to low-cost and fast stator winding manufacturing. Hence, this stator type is the most interesting one to be studied. Different slot and pole combinations are considered based on the finite element analysis (Flux2D by Cedrat is employed in the computations).

[1]  C. Sadarangani,et al.  Winding factors and Joule losses of permanent magnet machines with concentrated windings , 2003, IEEE International Electric Machines and Drives Conference, 2003. IEMDC'03..

[2]  J. Pyrhönen,et al.  TORQUE RIPPLE OF PERMANENT MAGNET MACHINES WITH CONCENTRATED WINDINGS , 2005 .

[3]  Pia Salminen,et al.  Fractional slot permanent magnet synchronous motors for low speed applications , 2004 .

[4]  Juliette Soulard,et al.  Investigation on Pole-Slot Combinations for Permament Magnet Machines with Concentrated Windings , 2004 .

[5]  Juha Pyrhonen,et al.  Pull-out torque of fractional-slot PM-motors with concentrated winding , 2005 .

[6]  M. Niemela,et al.  Performance analysis of fractional slot wound PM-motors for low speed applications , 2004, Conference Record of the 2004 IEEE Industry Applications Conference, 2004. 39th IAS Annual Meeting..

[7]  T. M. Jahns,et al.  Comparison of synchronous PM machine types for wide constant-power speed operation: converter performance , 2007 .

[8]  Z. Zhu,et al.  Eddy-current loss in the rotor magnets of permanent-magnet brushless machines having a fractional number of slots per pole , 2005, IEEE Transactions on Magnetics.

[9]  K. Atallah,et al.  Rotor Eddy-Current Loss in Permanent-Magnet Brushless AC Machines , 2004, IEEE Transactions on Magnetics.

[10]  P. Viarouge,et al.  Synthesis of High-Performance PM Motors with Concentrated Windings , 2002, IEEE Power Engineering Review.

[11]  H. Polinder,et al.  Eddy-Current Losses in the Solid Back-Iron of PM Machines for different Concentrated Fractional Pitch Windings , 2007, 2007 IEEE International Electric Machines & Drives Conference.

[12]  Jiabin Wang,et al.  Rotor eddy-current loss in permanent magnet brushless machines , 2004, IEEE transactions on magnetics.

[13]  Jacek F. Gieras,et al.  Permanent magnet motor technology : design and applications , 1996 .

[14]  H. Polinder,et al.  Comparison of direct-drive and geared generator concepts for wind turbines , 2005, IEEE International Conference on Electric Machines and Drives, 2005..