DocumentCode :
869171
Title :
Optimal Design and Control of a Wheel Motor for Electric Passenger Cars
Author :
Yang, Yee-Pien ; Chuang, Down Su
Author_Institution :
Dept. of Mech. Eng., Nat. Taiwan Univ., Taipei
Volume :
43
Issue :
1
fYear :
2007
Firstpage :
51
Lastpage :
61
Abstract :
An optimal design and control technology of a wheel motor is proposed for small electric passenger cars. The axial-flux sandwich-type disc motor is designed with a rotor embedded with neodymium-iron-boron (NdFeB) magnets and two plates of stators, and is directly mounted inside the wheel without mechanical transmission and differential gears. Sensitivity analyses are performed to choose critical design parameters, which are the most influential in design objectives, to maximize the driving torque, efficiency, rated speed, and to minimize the weight of motor under various constraints of size, materials, and power sources. The optimal driving current waveform is proven to be the same as the fundamental harmonic of the back electromotive force to produce maximum torque with least ripples. The finite-element refinement results in the motor prototype with a maximum torque over 38 kgmiddotm and a corresponding torque density of about 1.72 kgmiddotm/kg at the maximum allowable phase current of 50.25 A (rms). Two such rear driving wheels are able to drive a 600 kg passenger car to accelerate from 0 to 40 km/h in 5 s on a 15 degree incline. This dedicated wheel motor is applicable to pure or hybrid electric vehicles as a promising solution to the direct-driven electric vehicle
Keywords :
electric motors; finite element analysis; hybrid electric vehicles; machine control; optimal control; rotors; sensitivity analysis; stators; torque; wheels; axial flux sandwich-type disc motor design; direct-driven electric vehicles; electric passenger cars; electric vehicles; finite element refinement; motor prototype; neodymium-iron-boron magnets; optimal control; optimal design; optimal driving current waveform; rotors; sensitivity analysis; stators; torque density; wheel motor; Finite element methods; Gears; Hybrid electric vehicles; Magnets; Optimal control; Rotors; Sensitivity analysis; Stators; Torque; Wheels; Axial-flux wheel motor; electrical vehicle; optimal driving current waveform; sensitivity analysis;
fLanguage :
English
Journal_Title :
Magnetics, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9464
Type :
jour
DOI :
10.1109/TMAG.2006.886153
Filename :
4033132
Link To Document :
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