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Application of Direct-Drive Wheel Motor for Fuel Cell Electric and Hybrid Electric Vehicle Propulsion System

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6 Author(s)
Rahman, K.M. ; Gen. Motors Hybrid Power Train Eng., Troy, MI ; Patel, N.R. ; Ward, T.G. ; Nagashima, J.M.
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This paper presents a gearless wheel motor drive system specifically designed for fuel cell electric and hybrid electric vehicle propulsion application. The system includes a liquid-cooled axial flux permanent-magnet machine designed to meet the direct-drive requirements. The machine design implements techniques to increase the machine inductance in order to improve machine constant power range and high-speed efficiency. The implemented technique reduces machine spin loss to further improve efficiency. The machine design also optimizes the placement of magnets in the rotor to reduce cogging and ripple torque. An original cooling system arrangement based on the use of high thermal conductivity epoxy joining machine stator and liquid-cooled aluminum casing allows the very effective removal of machine power loss. Design details and experimental results are presented

Published in:

Industry Applications, IEEE Transactions on  (Volume:42 ,  Issue: 5 )

Date of Publication:

Sept.-Oct. 2006

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