Experimental Evaluation of a Radial-Radial-Flux Compound-Structure Permanent-Magnet Synchronous Machine Used for HEVs

A compound-structure permanent-magnet synchronous machine (CS-PMSM) system used for hybrid electric vehicles (HEVs) enables an internal combustion engine (ICE) to operate within optimum efficiency region independent of road conditions, thus decreasing the emissions and fuel consumption. In this paper a radial-radial-flux CS-PMSM is investigated. It integrates two synchronous machines radially, one is called double-rotor machine (DRM) and the other is called Stator Machine (SM). A downsized prototype machine of the CS-PMSM was designed and manufactured, and the tests were performed. The back electromotive force (BEMF) and efficiency of the DRM and SM are measured and analyzed, respectively. The BEMFs of both machines are approximately sinusoidal, which shows a good design of the magnetic structure. The two machines have efficiencies above 85% in a wide range in both motor and generator modes, but the peak efficiency is not well-content, which is analyzed by investigating the loss distribution. The temperatures of the DRM and SM are further measured, showing a good thermal behavior of the stator but serious overheat of the inner-rotor windings, which must be improved.

[1]  Erik Nordlund,et al.  The Four-Quadrant Transducer System for Hybrid Electric Vehicles , 2005 .

[2]  C. Sadarangani,et al.  Investigation of the winding current distribution in a 4-quadrant-transducer prototype machine , 2005, IEEE Transactions on Magnetics.

[3]  Ping Zheng,et al.  Research on the Cooling System of a 4QT Prototype Machine Used for HEV , 2008, IEEE Transactions on Energy Conversion.

[4]  Ping Zheng,et al.  Research on the Parameters and Performances of a 4QT Prototype Machine Used for HEV , 2007, IEEE Transactions on Magnetics.

[5]  G. Slemon,et al.  Reduction of cogging torque in permanent magnet motors , 1988 .

[6]  C. C. Chan,et al.  The state of the art of electric and hybrid vehicles , 2002, Proc. IEEE.

[7]  Ching Chuen Chan,et al.  Emerging Energy-Efficient Technologies for Hybrid Electric Vehicles , 2007, Proceedings of the IEEE.

[8]  Chandur Sadarangani,et al.  Two-dimensional finite element method simulation of a four-quadrant transducer prototype machine considering skewed slots , 2006 .

[9]  C. Sadarangani,et al.  The four-quadrant energy transducer , 2002, Conference Record of the 2002 IEEE Industry Applications Conference. 37th IAS Annual Meeting (Cat. No.02CH37344).

[10]  Ping Zheng,et al.  Compound-structure permanent-magnet synchronous machine used for HEVs , 2008, 2008 International Conference on Electrical Machines and Systems.

[11]  Thomas Bäckström,et al.  Integrated Energy Transducer Drive for Hybrid Electric Vehicles , 2000 .

[12]  C. Sadarangani,et al.  A four-quadrant HEV drive system , 2002, Proceedings IEEE 56th Vehicular Technology Conference.