Flux Weakening Mechanism of Interior Permanent Magnet Synchronous Machines With Segmented Permanent Magnets

The flux weakening mechanism of interior permanent magnet synchronous machines with segmented permanent magnets (PMs) in the rotor is studied in this paper. Air gap flux density with and without segments are analyzed and compared, based on both analytical and finite element methods. Frozen permeability technique is used to separate the PM component flux density in iron bridges at load condition, to find out the influence of demagnetizing current on flux variation. Design parameters are optimized to improve the field weakening capability. A novel explanation is proposed to explain the improvement effect of the flux weakening capability by magnet segmentation.

[1]  L. Tutelea,et al.  PM-assisted reluctance synchronous motor/generator (PM-RSM) for mild hybrid vehicles: electromagnetic design , 2004, IEEE Transactions on Industry Applications.

[2]  Ki-Chan Kim.  A Novel Magnetic Flux Weakening Method of Permanent Magnet Synchronous Motor for Electric Vehicles , 2012, IEEE Transactions on Magnetics.

[3]  S.M. Madani,et al.  New interior PM rotor design with high flux-weakening capability , 2009, 2009 IEEE International Electric Machines and Drives Conference.

[4]  M.F. Rahman,et al.  Design and Analysis of an Interior Permanent Magnet (IPM) Machine With Very Wide Constant Power Operation Range , 2008, IEEE Transactions on Energy Conversion.

[5]  M. F. Rahman,et al.  Saliency ratio derivation and optimisation for an interior permanent magnet machine with concentrated windings using finite-element analysis , 2010 .

[6]  Yoji Takeda,et al.  Motor design considerations and test results of an interior permanent magnet synchronous motor for electric vehicles , 1997, IAS '97. Conference Record of the 1997 IEEE Industry Applications Conference Thirty-Second IAS Annual Meeting.

[7]  In-Joong Ha,et al.  Flux-Weakening Control of IPM Motors With Significant Effect of Magnetic Saturation and Stator Resistance , 2008, IEEE Transactions on Industrial Electronics.

[8]  P. Virtic,et al.  Design and Finite-Element Analysis of Interior Permanent Magnet Synchronous Motor With Flux Barriers , 2008, IEEE Transactions on Magnetics.

[9]  C. Cossar,et al.  Flux-linkage calculation in permanent-magnet motors using the frozen permeabilities method , 2005, IEEE Transactions on Magnetics.

[10]  Sang-Yong Jung,et al.  Novel Analysis and Design Methodology of Interior Permanent-Magnet Synchronous Motor Using Newly Adopted Synthetic Flux Linkage , 2011, IEEE Transactions on Industrial Electronics.

[11]  Bojan Štumberger,et al.  Analysis of interior permanent magnet synchronous motor designed for flux weakening operation , 2001 .