Optimization of split ratio to design the PM brushless DC motor

The split ratio of the permanent magnet motor is one of the most important design parameters. It can not only influence the motor electrical torque and efficiency, but also can influence the motor thermal behavior. According to the high torque, short duty permanent magnet brushless motor, the thermal behavior should be investigated carefully. In this paper, the influence of the split ratio on the motor characteristics is investigated by field and circuit coupling finite elements analysis firstly. Then the influence of the split ratio on the motor thermal behavior of is analyzed, emphasis on the high torque short duty operation. The optimal design results are verified experimentally.

[1]  D. Howe,et al.  Optimal split ratio for permanent magnet brushless motors , 2006, Sixth International Conference on Electrical Machines and Systems, 2003. ICEMS 2003..

[2]  Jong-In Lee,et al.  The Temperature Rise Characteristic Analysis Technique of the Traction Motor for EV Application , 2006, 2006 International Forum on Strategic Technology.

[3]  Z. Zhu,et al.  Optimal split ratio for high-speed permanent magnet brushless DC motors , 2001, ICEMS'2001. Proceedings of the Fifth International Conference on Electrical Machines and Systems (IEEE Cat. No.01EX501).

[4]  G. Bertotti.  General properties of power losses in soft ferromagnetic materials , 1988 .

[5]  N. Bianchi,et al.  Potentials and limits of high-speed PM motors , 2003, IEEE Transactions on Industry Applications.

[6]  Z. Q. Zhu,et al.  Design and analysis of high-speed brushless permanent magnet motors , 1997 .

[7]  Li Hong-tao.  Starting performance of permanent magnet synchronous motor with a solid rotor , 2007 .

[8]  Nicola Bianchi,et al.  Potentials and limits of high speed PM motors , 2003 .