Design criteria for high-efficiency SPM synchronous motors

This paper deals with the design criteria for a high-efficiency permanent magnet synchronous motor. The goal is not pursued by a trivial reduction of the electric and magnetic loadings (which decrease motor losses) but optimizing a set of motor design variables, without increasing the overall dimensions, which are typically imposed as design constraints. The effect of the number of slots and of the inner-to-outer diameter ratio on motor losses is investigated. The possibility of designing a stator with a tooth length lower than the total core length, using soft magnetic composites, is studied. Finally, a criterion is proposed to evaluate the convenience of using a nonoverlapping winding. An analytical approach is adopted so as to allows the obtained results to be useful for a wide variety of permanent magnet machines.

[1]  H. Murakami,et al.  Highly efficient brushless motor design for an air-conditioner of the next generation 42 V vehicle , 2001, Conference Record of the 2001 IEEE Industry Applications Conference. 36th IAS Annual Meeting (Cat. No.01CH37248).

[2]  Jianguo Zhu,et al.  Core losses in claw pole permanent magnet machines with soft magnetic composite stators , 2003 .

[3]  B. Mecrow,et al.  Soft magnetic composite materials-use for electrical machines , 1995 .

[4]  G.R. Slemon,et al.  Modeling of iron losses of surface-mounted permanent magnet synchronous motors , 2001, Conference Record of the 2001 IEEE Industry Applications Conference. 36th IAS Annual Meeting (Cat. No.01CH37248).

[5]  Paula Fonseca,et al.  Characterisation of the Electricity Use in European Union and the Savings Potential in 2010 , 1997 .

[6]  Yoji Takeda,et al.  Electric Motors for Home Applications – Development of Environment-Friendly Electric Motors , 2004 .

[7]  Rudolf Richter.  Lehrbuch der Wicklungen elektrischer Maschinen , 1952 .

[8]  M. Villani,et al.  Evaluation of the Design Options and Cost Impact of Improving Induction Motor Efficiency , 2000 .

[9]  F. Profumo,et al.  Novel axial flux interior PM synchronous motor realized with powdered soft magnetic materials , 1998, Conference Record of 1998 IEEE Industry Applications Conference. Thirty-Third IAS Annual Meeting (Cat. No.98CH36242).

[10]  P. Viarouge,et al.  Design of PM brushless motors using iron-resin composites for automotive applications , 1998, Conference Record of 1998 IEEE Industry Applications Conference. Thirty-Third IAS Annual Meeting (Cat. No.98CH36242).

[11]  Nigel Schofield,et al.  Parasitic rotor losses in a brushless permanent magnet traction machine , 1997 .

[12]  Barrie Mecrow,et al.  Combined radial and axial permanent magnet motors using soft magnetic composites , 1999, IEMDC 1999.

[13]  P. Viarouge,et al.  A new structure of universal motor using soft magnetic composites , 2001, Conference Record of the 2001 IEEE Industry Applications Conference. 36th IAS Annual Meeting (Cat. No.01CH37248).

[14]  Henk Polinder,et al.  Eddy-current losses in the segmented surface-mounted magnets of a PM machine , 1999 .

[15]  Raul Rabinovici,et al.  Eddy current losses of permanent magnet motors , 1994 .

[16]  B.C. Mecrow,et al.  Iron loss in machines with powdered iron stators , 1999, IEEE International Electric Machines and Drives Conference. IEMDC'99. Proceedings (Cat. No.99EX272).

[17]  Michele Pastorelli,et al.  A simplified method for the iron losses prediction in soft magnetic materials with arbitrary voltage supply , 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]  Stefano Cocchi,et al.  The New European Database on Efficient Electric Motor Systems: EURODEEM-98 , 2000 .

[19]  Paolo Bertoldi,et al.  The European Negotiated Agreement to Improve Motor Efficiency , 2000 .