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- 저자 : Zhu Gaojia (검색결과 3 건)
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Zhu Gaojia,Jia Nan,Li Longnv,Liu Tao,Xue Ming,Li Meijun 대한전기학회 2021 Journal of Electrical Engineering & Technology Vol.16 No.6
Due to the high power density characteristics of permanent magnet (PM) traction motors and the strict loading conditions of electric vehicle (EV) engine compartments, the excessive losses inside the motors can elevate rapidly the temperature rises, deteriorate the magnetic property of PMs, limit the output torques, and even cause the overheating damages of the machines. In order to guarantee the operational reliability, it’s of vital importance to research and develop the eff ective, reliable and economical cooling systems for improving the working performances of the PM traction motors. In this paper, the three-dimensional (3D) fl uidic-thermal coupled model of a high power density interior PM traction motor is established based on the basic theory of computational fl uid dynamics (CFD) and numerical heat transfer. The fl uid fl ow and thermal distributions are analyzed based on fi nite volume method (FVM), and verifi ed by experimental results. According to the heating characteristics of the motor, the external water frame structure of the motor shell is modifi ed to improve the cooling effi ciency. Taguchi method is used to optimize the cooling structural parameters, so as to reduce the steady-state temperature rise of the motor. The research work in this paper has certain reference signifi cance for the design and development of high power density PM traction motors used in EV applications.
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A Position Detection Method for Dynamic Wireless Inspection Robots Charging
Xue Ming,Yang Qingxin,Zhu Gaojia,Li Longnv 대한전기학회 2022 Journal of Electrical Engineering & Technology Vol.17 No.1
The paper proposes a new structure of the receiving coil, which features horizontal and vertical position detection of inspection robot, which eliminates the system dependence on complex detection control circuit and simplifi es the circuit design of the receiving end. The proposed design obtains the position information by comparing the induced voltage diff erence of the four-coil sets. Besides, the receiving coil is optimized in terms of the shape, dimension and the magnetic shielding structure by fi nite element analysis. Finally, the eff ectiveness of the receiving coil position detection is verifi ed by the experiment with misalignment disturbance. The results illustrate the eff ectiveness of the four-coil system to detect the load position and the position adjustment by the adjustment control system
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Design Optimization of a Combined Shielding Structure for a High Impedance Auto-Transformer
Li Longnv,Hu Shengyang,Zhao Yishuang,Xiao Hang,Liu Tao,Xue Ming,Zhu Gaojia 대한전기학회 2023 Journal of Electrical Engineering & Technology Vol.18 No.5
In this paper, a combined shielding structure for the oil tank of an OSFSZ-250000KVA/220 kV transformer is proposed and optimized to reduce the magnetic flux leakage and the stray losses. Firstly, the shielding effects of the transverse and longitudinal shielding structures are studied based on three-dimensional frequency-domain nonlinear finite element method. Secondly, the combined shielding structure is proposed with copper shielding introduced at both ends of the transverse magnetic shielding to effectively reduce the magnetic flux leakage of the oil tank. Therefore, the eddy current loss in the oil tank can be significantly reduced. Finally, Taguchi method is used to optimize the structural parameters of the combination shielding to reduce both the oil tank eddy current losses and the shielding costs. The study in this paper can provide guidance for the design of large capacity power transformers, and has important engineering significance.
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