Title :
Application of Direct-Drive Wheel Motor for Fuel Cell Electric and Hybrid Electric Vehicle Propulsion System
Author :
Rahman, Khwaja M. ; Patel, Nitin R. ; Ward, Terence G. ; Nagashima, James M. ; Caricchi, Federico ; Crescimbini, Fabio
Author_Institution :
Gen. Motors Hybrid Power Train Eng., Troy, MI
Abstract :
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
Keywords :
cooling; electric propulsion; fuel cell vehicles; hybrid electric vehicles; losses; magnetic flux; motor drives; permanent magnet motors; rotors; stators; thermal conductivity; torque; wheels; cogging torque reduction; cooling system arrangement; direct-drive wheel motor; fuel cell electric vehicle; gearless wheel motor drive; hybrid electric vehicle propulsion system; liquid-cooled axial flux permanent-magnet machine; machine inductance; machine spin los reduction; ripple torque reduction; rotor; thermal conductivity epoxy; Design optimization; Forging; Fuel cells; Hybrid electric vehicles; Inductance; Magnets; Motor drives; Propulsion; Thermal conductivity; Wheels; Axial flux; component; direct drive; wheel motor;
Journal_Title :
Industry Applications, IEEE Transactions on
DOI :
10.1109/TIA.2006.880886
