A Novel Double Stator Flux Modulation Machine With Low-Temperature Superconducting Windings

2018 ◽  
Vol 28 (3) ◽  
pp. 1-6 ◽  
Author(s):  
Yuting Gao ◽  
Dawei Li ◽  
Ronghai Qu ◽  
Han Ding ◽  
Wubin Kong
Keyword(s):  
Low Temperature ◽  
Flux Modulation ◽  
Stator Flux

Effects of the Nitridation Process of (0001) Sapphire on Crystalline Quality of InN Grown by RF-MBE

2004 ◽  
Vol 831 ◽  
Author(s):  
Daisuke Muto ◽  
Ryotaro Yoneda ◽  
Hiroyuki Naoi ◽  
Masahito Kurouchi ◽  
Tsutomu Araki ◽  
...  
Keyword(s):  
Low Temperature ◽  
Buffer Layer ◽  
Buffer Layers ◽  
Crystalline Quality ◽  
Constant Independent ◽  
Nitrogen Flux ◽  
Sapphire Substrates ◽  
Nitridation Process ◽  
Flux Modulation

ABSTRACTThe effects of the nitridation process of (0001) sapphire on crystalline quality of InN were clearly demonstrated. The InN films were grown on NFM (nitrogen flux modulation) HT-InN or LT-InN buffer layers, which had been deposited on nitridated sapphire substrates. We found that low-temperature nitridation of sapphire is effective in improving the tilt distribution of InN films. Whereas the twist distribution remained narrow and almost constant, independent of nitridation conditions, when LT-InN buffer layers were used. The XRC-FWHM value of 54 arcsec for (0002) InN, the lowest reported to date, was achieved by using the LT-InN buffer layer and sapphire nitridation at 300°C for 3 hours.

Design and Analysis of 10 MW HTS Double-Stator Flux-Modulation Generator for Wind Turbine

2021 ◽  
Vol 31 (5) ◽  
pp. 1-8
Author(s):  
Yi Cheng ◽  
Yuanzhi Zhang ◽  
Ronghai Qu ◽  
Dawei Li ◽  
Yingzhen Liu ◽  
...  
Keyword(s):  
Wind Turbine ◽  
Flux Modulation ◽  
Stator Flux

scholarly journals Design and analysis of a new partitioned stator flux-modulation motor for direct drive applications

2020 ◽  
Vol 14 (2) ◽  
pp. 184-191
Author(s):  
Xuhui Zhu ◽  
Wenxiang Zhao ◽  
Liang Xu ◽  
Jinghua Ji
Keyword(s):  
Direct Drive ◽  
Flux Modulation ◽  
Stator Flux

Comparative study of partitioned stator flux-modulation motors with different permanent magnet arrays

2021 ◽  
pp. 1-19
Author(s):  
Chen Jia ◽  
Liang Xu ◽  
Jinghua Ji ◽  
Wenxiang Zhao
Keyword(s):  
Performance Comparison ◽  
Electromagnetic Torque ◽  
Array Type ◽  
Halbach Array ◽  
Modulation Techniques ◽  
Flux Modulation ◽  
Different Types ◽  
Pole Type ◽  
Stator Flux ◽  
Consequent Pole

By incorporating the merits of partitioned stator and flux modulation techniques, the partitioned stator flux modulation motors featuring high torque, have attracted much attention. This paper investigates four partitioned stator flux modulation motors with different types of PM arrays, including surface-mounted type, consequent-pole type, Halbach-array type, and half-Halbach type. The influences of key parameters on the average electromagnetic torque is conducted and compared. Then, based on the optimal designs, four motors are compared in terms of magnetic field distribution, back-electromotive force, torque characteristics, loss and overload ability. The result reveals that the half-Halbach motor is capable of utilizing more PM to improve electromagnetic torque. Also, the consequent-pole motor achieves the highest torque per PM usage. In addition, performance comparison under the same PM usage is carried out. The result shows that the half-Halbach motor not only exhibits the highest average torque but also achieves the highest PM utilization. Last, the prototype of half-Halbach motor is built for experimental verification.

Comparison of Electromagnetic Performance of 10-MW HTS Double-Stator Flux Modulation Wind Generators With Different Topologies

2020 ◽  
Vol 30 (4) ◽  
pp. 1-7 ◽  
Author(s):  
Yi Cheng ◽  
Ronghai Qu ◽  
Yuting Gao ◽  
Shuanghong Wang ◽  
Yingzhen Liu ◽  
...  
Keyword(s):  
Wind Generators ◽  
Flux Modulation ◽  
Stator Flux ◽  
Electromagnetic Performance

Exsolution and inversion in pigeonite from the Whin Sill, Northern England

1978 ◽  
Vol 36 (1) ◽  
pp. 474-475
Author(s):  
P.P.K. Smith
Keyword(s):  
High Temperature ◽  
Low Temperature ◽  
Homogeneous Nucleation ◽  
Silicate Mineral ◽  
Antiphase Boundaries ◽  
Two Phase ◽  
Primitive Form ◽  
The Core ◽  
Nucleation Mechanisms ◽  
And Inversion

Grains of pigeonite, a calcium-poor silicate mineral of the pyroxene group, from the Whin Sill dolerite have been ion-thinned and examined by TEM. The pigeonite is strongly zoned chemically from the composition Wo8En64FS28 in the core to Wo13En34FS53 at the rim. Two phase transformations have occurred during the cooling of this pigeonite:- exsolution of augite, a more calcic pyroxene, and inversion of the pigeonite from the high- temperature C face-centred form to the low-temperature primitive form, with the formation of antiphase boundaries (APB's). Different sequences of these exsolution and inversion reactions, together with different nucleation mechanisms of the augite, have created three distinct microstructures depending on the position in the grain.In the core of the grains small platelets of augite about 0.02μm thick have farmed parallel to the (001) plane (Fig. 1). These are thought to have exsolved by homogeneous nucleation. Subsequently the inversion of the pigeonite has led to the creation of APB's.

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