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- 저자 : Wanlu Xie (검색결과 3 건)
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Structure of a permanent magnet motor used for electric vehicles to suppress the eddy current effect
Meiwei Zhang,Weili Li,Wanlu Xie,Liangliang Zhang 전력전자학회 2022 JOURNAL OF POWER ELECTRONICS Vol.22 No.9
A demagnetization fault in the permanent magnet (PM) may occur when the temperature exceeds the limit temperature of the PM material due to the limited heat dissipation of the rotor in PM motors in the driving system of electric vehicles. In addition, PM thermal stress arises as a result of the unbalanced axial temperature distribution of the motor. When the thermal stress exceeds the yield strength of PM, micro-deformation of the PM structure happens and affects the performance and structural reliability of the motor. In this study, the rotor structure of an 18 kW PM motor is improved, and an eddy current ring structure of stainless steel is proposed. First, the effects of eddy current rings with axial lengths of 2, 5, and 10 mm on the eddy current losses of PM are compared. Second, a three-dimensional, steady-state temperature model of the motor is established to analyze the effects of the eddy current rings with different axial lengths on rotor temperature when the motor is running at different speeds. Results show that the eddy current ring structure with 2 mm axial length has the best effect on reducing rotor temperature. Lastly, the simulation results are verified using the test results of the 18 kW PM motor.
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Meiwei Zhang,Weili Li,Wanlu Xie,Haoyue Tang,Zhigang Wu 전력전자학회 2023 JOURNAL OF POWER ELECTRONICS Vol.23 No.3
The power density of a high-speed permanent magnet (PM) motor is high, and the heat dissipation of its rotor is poor due to limited installation space. Th0000000000000000000us, the temperature of the permanent magnets is high. Once the cooling system of a motor becomes ineffective and the rotor temperature exceeds the limit temperature of the PM material, a demagnetization fault of the PM occur, which seriously affects the performance of the PM motor. To ensure the safe and reliable operation of PM motors, a method to diagnose the PM health is presented in this paper. The demagnetization ratio of the PM can be diagnosed quantitatively by its temperature. In this paper, the relationship between the temperature and the demagnetization ratio of a PM is obtained through thermal demagnetization tests, and the threshold temperature of demagnetization is given. Then, the health of a PM under different effectiveness of the cooling system in a high-speed PM motor is researched. Finally, the calculation results are verified by temperature tests of a high-speed PM motor.
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Xiong Zhiyong,Wen Zhuoqi,Cui Zhongjie,Mei Shiliang,He Haiyang,Duan Zhongtao,Zhang Wanlu,Xie Fengxian,Guo Ruiqian 한국물리학회 2023 Current Applied Physics Vol.45 No.-
Hysteresis effects in self-luminous devices like organic light-emitting diodes (OLEDs) and perovskite light-emitting diodes (PeLEDs) have been discovered recently, besides emerging in thin film transistors (TFTs). However, the influences of lateral leakage caused by next-door devices on hysteresis effects in flexible OLEDs array have rarely been demonstrated. To mitigate the impact of lateral leakage and figure out the detailed relationship with hysteresis effects, a series of experiments for OLEDs array involving p-doping in holes transport layer (HTL) were employed. It is found that the lateral leakage and hysteresis effects have a trade-off exhibition, which means stronger lateral leakage has induced weaker hysteresis effects. In order to get rid of the role of lateral leakage, the experiments with mono blue devices were also performed to substantiate the intrinsic hysteresis effects existence. The research opens the possibility of considering more internal relationships between different performances on self-luminous arrays for their actual application.
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