Comparative study between interior and surface permanent magnet traction machine designs

Interior permanent magnet (IPM) brushless (sychronous) machines are a popular technology choice in commercial hybrid- or all-electric vehicles (HEVs/EVs), such as the Toyota Prius, GM Chevy Volt, Lexus LS, Nissan Leaf, for example. Much is claimed of IPM topologies in terms of their saliency torque contribution, minimum magnet mass, demagnetisation withstand, wide flux-weakening capability and high operational efficiencies when compared to brushless machines having surface mounted permanent magnets. This paper presents the findings of a comparative study assessing the design and performance attributes of an example IPM machine implemented in the Nissan Leaf EV, when compared to a surface permanent magnet (SPM) machine designed within the main Nissan Leaf machine dimensional constraints. The Nissan Leaf IPM traction machine has been widely analysed and there is much public domain data available for the machine. Hence, this machine is chosen as a representative benchmark design against which the SPM machine is assessed. The Nissan Leaf machine is analysed via finite element analysis (FEA) and the results confirmed via published experimental test data. The procedure is then applied to a SPM design and results compared. The study illustrates and concludes that both the IPM and SPM topologies have very similar capabilities with only subtle differences between the design options. The results highlight interesting manufacturing options and materials usage.

[1]  V. V. Sergeev,et al.  Physical and mechanical properties of sintered Nd?Fe?B type permanent magnets , 1996 .

[2]  Makoto Abe,et al.  Development of High Response Motor and Inverter System for the Nissan LEAF Electric Vehicle , 2011 .

[3]  A. Binder,et al.  High-speed inverter-fed AC drives , 2007, 2007 International Aegean Conference on Electrical Machines and Power Electronics.

[4]  Nabeel A. O. Demerdash,et al.  A flux-weakening control approach for interior permanent magnet synchronous motors based on Z-source inverters , 2014, 2014 IEEE Transportation Electrification Conference and Expo (ITEC).

[5]  Kais Atallah,et al.  Design Optimization of a Surface-Mounted Permanent-Magnet Motor With Concentrated Windings for Electric Vehicle Applications , 2013, IEEE Transactions on Vehicular Technology.

[6]  Kum-Kang Huh,et al.  Comparison of interior and surface PM machines equipped with fractional-slot concentrated windings for hybrid traction applications , 2011, 2011 IEEE Energy Conversion Congress and Exposition.

[7]  David G. Dorrell,et al.  Analysis and Design Techniques Applied to Hybrid Vehicle Drive Machines—Assessment of Alternative IPM and Induction Motor Topologies , 2012, IEEE Transactions on Industrial Electronics.

[8]  Long Jin,et al.  Development of an air-cooled 150 kW high speed permanent magnet motor with Gramme ring windings for turbo blowers , 2014, 2014 17th International Conference on Electrical Machines and Systems (ICEMS).

[9]  Jung-Pyo Hong,et al.  Mechanical Stress Reduction of Rotor Core of Interior Permanent Magnet Synchronous Motor , 2012, IEEE Transactions on Magnetics.

[10]  Grzegorz Ombach,et al.  Demagnetization properties of IPM and SPM motors used in the high demanding automotive application , 2012 .

[11]  T.M. Jahns,et al.  Optimal flux weakening in surface PM machines using fractional-slot concentrated windings , 2005, IEEE Transactions on Industry Applications.

[12]  Gianmario Pellegrino,et al.  Performance Comparison Between Surface-Mounted and Interior PM Motor Drives for Electric Vehicle Application , 2012, IEEE Transactions on Industrial Electronics.