http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Ding Qiang,Deng Zhiquan,Wang Xiaolin,Wu Guyu,Ni Tuocheng 대한전기학회 2016 Journal of Electrical Engineering & Technology Vol.11 No.5
This paper proposes a novel Lorenz-force-type bearingless motor with single-axis actively positioned functionality. The novel motor consists of two slotless surface-mounted permanent magnet(SPM) motors, which have six skewed coils for each motor to constitute 3-phase windings and are in tandem along axial direction so as to achieve actively regulated axial motion. Additionally, two repulsive permanent magnet bearings (RPMBs) are used to passively stabilize radial- and tilting movements of the rotor. The slotless stator iron is employed for arrangement of the skewed coils in toroidal form. Compared with state-of-the-art single-axis actively controlled bearingless motors utilizing field weakening or strengthening effect of d-axis current to regulate axial movement, perhaps suffering irreversible demagnetization of permanent magnets especially at the time of start-up, the merit of this proposed motor is beneficial to prevent the demagnetization risk of permanent magnets. To verify the novel concept, firstly, theoretical analysis is carried out for modeling back electromagnetic force (back-EMF), axial force, drive torque. Followed by the analytical model, a detailed design process by integration of analytical method and finite element analysis (FEA) for the structural parameters are revealed. At last, 3-D FEA is performed to validate the correctness of analytical model, design process as well as to evaluate the performance of proposed motor.
Deng Shuping,Jiang Xianyan,Zhang Ziye,Liu Junjie,Chen Lili,Qi Ning,Tang Xinfeng,Wu Yichu,Chen Zhiquan 한국물리학회 2021 Current Applied Physics Vol.26 No.-
In this paper, a series of CuIn1-xGaxTe2 samples were prepared by vacuum melting combined with the spark plasma sintering process based on the initial stoichiometric ratios of 1: 1-x: x: 2 (x = 0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9 and 1.0). Crystal results indicate that all Cu(In, Ga)Te2 system samples are the chalcopyrite structure with space group I42d. Thermal analysis results show that all the samples have excellent reproducibility and thermal stability. EPMA data indicates that Ga tended to replace In site instead of Cu or Te. Meanwhile, the roomtemperature carrier concentration of all p-type samples varies from 0.30 × 1019 to 1.25 × 1019cm 3, since carrier mobility changes from 15.16 to 69.27 cm2 V 1 s 1. Ultimately, the significantly reduced total thermal conductivity is observed in the Ga-doped samples, and the maximum ZT value of 0.80 is obtained at 773 K for the CuIn0.8Ga0.2Te2 sample due to the lower thermal conductivity