Design of Traction Motor for Mitigating Energy Consumption of Light Electric Vehicle Considering Material Properties and
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DESIGN OF TRACTION MOTOR FOR MITIGATING ENERGY CONSUMPTION OF LIGHT ELECTRIC VEHICLE CONSIDERING MATERIAL PROPERTIES AND DRIVE CYCLES Dong-Min Kim, Young-Hoon Jung, Kyoung-Soo Cha and Myung-Seop Lim* Department of Automotive Engineering, Hanyang University, Seoul 04763, Korea (Received 23 April 2019; Revised 16 December 2019; Accepted 20 January 2020) ABSTRACTLight electric vehicles (LEVs) are usually used as neighborhood electric vehicles (NEVs) for the second vehicle or car-sharing service. For LEVs, it is important to reduce energy consumption to have greater mileage at the same battery capacity. One of the direct ways to decrease energy consumption is the efficiency improvement of the traction motor, which is the main propulsion system. Also, the weight reduction of the traction motor can be a solution to energy usage mitigation. This paper suggested the design process of a traction motor for LEV considering material properties to minimizing the energy consumption of the vehicle. During the design process, vehicle simulation was adopted to calculate energy consumption. In addition, traction motor and battery which are the key components of LEV were mathematically modeled and used in the simulation. Using them, energy consumption was estimated within the change of stack length of the traction motor for some drive cycles. Finally, from these simulations, optimum power density is determined which minimizes energy consumption. KEY WORDS : Drive cycle, Energy consumption, Interior permanent magnet synchronous motor (IPMSM), Light electric vehicle (LEV), Mechanical stress, Power density
1. INTRODUCTION
the whole grid aspect. To increase the energy efficiency of the EV, the overall weight of the vehicle should be reduced, and the power efficiency for the operating region should be improved. Moreover, reduction of the energy loss should be achieved such as drag coefficient reduction. Especially, what can be done to achieve a reduction of the energy loss in the design aspect of the traction motor, is the improvement of power efficiency and enhancement of the power density of the main propulsion system. There are many studies on the improving efficiency, and power density of traction motor for EV have been carried out. Momen et al. (2019) designed electric motor using hairpin winding which can secure more slot fill factor. Wu et al. (2018) conducted efficiency optimization of interior permanent magnet synchronous motor (IPMSM) considering controller circuit. Hwang et al. (2018) studied power density improvement of rare earth free wound field synchronous motor (WFSM) by the permanent magnet (PM) assisting. There are also existed research on the efficiency improvement for the flux modulation machines, not a conventional permanent magnet synchronous motor (PMSM) (Zhao et al., 2019; Xiang et al., 2019). In addition, papers exist, focusing the efficiency enhancement through the control aspects. Huang et al. (2019) studied the torque distribution technique, improving t
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