Design of new spoke type brushless DC motor for neodymium permanent magnet free

This paper proposes a new design for a spoke-type brushless DC (BLDC) motor that does not require the use of a neodymium permanent magnet (Nd-PM). Recently, there has been a steep hike in the price of Nd-PM. In particular, the motor using in the vehicle is more seriously. Therefore, possible alternatives for Nd-PMs are being explored. In this study, we have proposed the replacement of Nd-PM with a ferrite Permanent Magnet (Fe-PM). The proposed model has an improved output characteristic because it uses the properties of the magnetic flux effect of the spoke-type motor. In addition, this model maximizes the magnetic flux density by using an assistant permanent magnet. The whole procedure system was optimized using a proposed calculation method for improving torque density. Also was verified by using the finite element method (FEM).

[1]  Gyu-Hong Kang,et al.  Optimal design of spoke type BLDC motor considering irreversible demagnetization of permanent magnet , 2003, Sixth International Conference on Electrical Machines and Systems, 2003. ICEMS 2003..

[2]  S. Ogasawara,et al.  Torque Density and Efficiency Improvements of a Switched Reluctance Motor Without Rare-Earth Material for Hybrid Vehicles , 2011, IEEE Transactions on Industry Applications.

[3]  O. Ichinokura,et al.  A new analytical model of IPM motor based on magnetic reluctance matrix , 2010, The XIX International Conference on Electrical Machines - ICEM 2010.

[4]  Masayuki Sanada,et al.  Interior permanent magnet linear synchronous motor for high performance drives , 1996, IAS '96. Conference Record of the 1996 IEEE Industry Applications Conference Thirty-First IAS Annual Meeting.

[5]  D. Howe,et al.  Analytical magnetic field analysis of Halbach magnetized permanent-magnet machines , 2004, IEEE Transactions on Magnetics.

[6]  T. Hamiti,et al.  Comparison Between Finite-Element Analysis and Winding Function Theory for Inductances and Torque Calculation of a Synchronous Reluctance Machine , 2007, IEEE Transactions on Magnetics.