| OPTIMUM DESIGN CONSIDERING MAIN OPERATING POINTS OF
EV TRACTION MOTOR FOR TORQUE RIPPLE REDUCTION AND
FUEL ECONOMY IMPROVEMENT |
| Seok-Won Woo 1,2, Jin-Cheol Park 3, Moo-Hyun Sung 2, Ye-Na Bae 2, Jongsun Yoon 2, Kyoung-Soo Cha 3, Myung-Seop Lim 3 |
1Motor Development Department, LG Magna e-Powertrain Co., Ltd.
2Department of Automotive Engineering (Automotive-Computer Convergence), Hanyang University
3Department of Automotive Engineering, Hanyang University |
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| ABSTRACT |
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In this paper, the optimum design considering main operating points (MOPs) of the electric vehicle (EV) traction
motor is conducted to reduce the torque ripple and improve the fuel economy. MOPs of the traction motor can be determined
by considering ratios of number of operating points or considering energy consumption ratios based on the EV simulation.
Specifically, the optimum design is conducted with the aim of minimizing the torque ripples at MOPs determined by
considering ratios of number of operating points (RNOMOPs) and maximizing the inverter-motor system efficiencies at MOPs
determined by considering energy consumption ratios (ECRMOPs) to simultaneously reduce the torque ripple and improve the
fuel economy. To verify the effectiveness of the optimum design considering MOPs proposed in this paper, torque ripples at
RNOMOPs and the fuel economies according to the initial model and the optimum model are compared. As a result, torque
ripples of the optimum model at RNOMOPs are remarkably decreased by 58.84 %p and 57.77 %p, respectively, and the fuel
economy according to the optimum model is improved by 1.72 %. Conclusively, the effectiveness of the optimum design
considering MOPs of the EV traction motor for the torque ripple reduction and the fuel economy improvement is verified. |
| Key Words:
Electric vehicle, Fuel economy, Main operating point, Optimum design, System efficiency, Torque ripple,
Traction motor |
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Corresponding Author.
Myung-Seop Lim , Email. 
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