Study Status of Giant Magnetostrictive Material Applied in Measurement Field

2014 ◽  
Vol 716-717 ◽  
pp. 98-101
Author(s):  
Hui Fang Liu ◽  
Jian Chun Zhang ◽  
Ke Ran Li ◽  
Ye Li
Keyword(s):  
Rare Earth ◽  
High Temperature ◽  
Permanent Magnets ◽  
Hot Spot ◽  
Luminescent Material ◽  
Functional Material ◽  
Magnetostrictive Material ◽  
High Temperature Superconducting ◽  
Giant Magnetostrictive Material ◽  
New Type

Giant Magnetostrictive material is a new type of rare earth functional material which is after the rare earth permanent magnets, rare earth luminescent material and rare earth high temperature superconducting material. At present, giant magnetostrictive material has become a domestic research hot spot, and made great achievements. In this paper, research and application status on giant magnetostrictive material has been summarized. It mainly includes two aspects: giant magnetostrictive sensors and self-sensing actuator.

High temperature oxidation of rare earth permanent magnets. Part 1 – Microstructure evolution and general mechanism

2018 ◽  
Vol 133 ◽  
pp. 374-385 ◽  
Author(s):  
Muhamad Firdaus ◽  
M. Akbar Rhamdhani ◽  
W. John Rankin ◽  
Mark Pownceby ◽  
Nathan A.S. Webster ◽  
...  
Keyword(s):  
Rare Earth ◽  
High Temperature ◽  
Microstructure Evolution ◽  
High Temperature Oxidation ◽  
Permanent Magnets ◽  
General Mechanism ◽  
Temperature Oxidation

scholarly journals High-Temperature Superconducting Non-Insulation Closed-Loop Coils for Electro-Dynamic Suspension System

Electronics ◽  
2021 ◽  
Vol 10 (16) ◽  
pp. 1980
Author(s):  
Li Lu ◽  
Wei Wu ◽  
Xin Yu ◽  
Zhijian Jin
Keyword(s):  
High Temperature ◽  
Liquid Helium ◽  
High Speed ◽  
Closed Loop ◽  
Permanent Magnets ◽  
Superconducting Magnets ◽  
Current Mode ◽  
Persistent Current ◽  
Magnetomotive Force ◽  
High Temperature Superconducting

The null-flux electro-dynamic suspension (EDS) system is a feasible high-speed maglev system with speeds of above 600 km/h. Owing to their greater current-carrying capacity, superconducting magnets can provide a super-magnetomotive force that is required for the null-flux EDS system, which cannot be provided by electromagnets and permanent magnets. Relatively mature high-speed maglev technology currently exists using low-temperature superconducting (LTS) magnets as the core, which works in the liquid helium temperature region (T ⩽ 4.2 K). Second-generation (2G) high-temperature superconducting (HTS) magnets wound by REBa2Cu3O7−δ (REBCO, RE = rare earth) tapes work above the 20 K region and do not rely on liquid helium, which is rare on Earth. In this study, the HTS non-insulation closed-loop coils module was designed for an EDS system and excited with a persistent current switch (PCS). The HTS coils module can work in the persistent current mode and exhibit premier thermal quenching self-protection. In addition, a full-size double-pancake (DP) module was designed and manufactured in this study, and it was tested in a liquid nitrogen (LN2) environment. The critical current of the DP module was approximately 54 A, and it could work in the persistent current mode with an average decay rate measured over 12 h of 0.58%/day.

scholarly journals Study on Applicability of Rare Earth High-temperature Superconducting Wires to Superconducting Magnet for Maglev System

2010 ◽  
Vol 51 (3) ◽  
pp. 151-155 ◽  
Author(s):  
Masafumi OGATA ◽  
Katsutoshi MIZUNO ◽  
Yuuki ARAI ◽  
Hitoshi HASEGAWA ◽  
Takashi SASAKAWA ◽  
...  
Keyword(s):  
Rare Earth ◽  
High Temperature ◽  
Superconducting Magnet ◽  
Superconducting Wires ◽  
High Temperature Superconducting ◽  
Maglev System

Modeling and verification of the equivalent circuit for high temperature superconducting partial-core transformer with ReBCO-coated conductors

2018 ◽  
Vol 37 (3) ◽  
pp. 1228-1243
Author(s):  
Daoyu Hu ◽  
Jianwen Zhang ◽  
Feng Gu ◽  
Zhuyong Li
Keyword(s):  
High Temperature ◽  
Equivalent Circuit ◽  
Modeling Method ◽  
Coated Conductors ◽  
Ac Losses ◽  
Content Type ◽  
High Temperature Superconducting ◽  
Iterative Computation ◽  
Core Losses ◽  
New Type

Purpose The purpose of this study is to propose a modeling method of the equivalent circuit for a new type of high-temperature superconducting partial-core transformer (HTS-PCT) made of ReBCO-coated conductors. Design/methodology/approach The modeling process is based on the “Steinmetz” equivalent circuit. The impedance components in the circuit are obtained by the calculations of the core losses and AC losses of the HTS windings by using theoretical methods. An iterative computation is also used to decide the equivalent resistances of the AC losses of the primary and secondary HTS windings. The reactance components in the circuit are calculated from the energy stored in the magnetic fields by finite element method. The validation of the modeling method is verified by experimental results Findings The modeling method of the equivalent circuit of HTS-PCT is valid, and an equivalent circuit for HTS-PCT is presented. Practical implications The equivalent circuit of HTS-PCT could be obtained by the suggested modeling method. Then, it is easy to analyze the characteristics of the HTS-PCT by its equivalent circuit. Moreover, the modeling method could also be useful for the design of a specific HTS-PCT. Originality/value The study proposes a modeling method of the HTS-PCT made of the second-generation HTS tapes, i.e. ReBCO-coated conductors.

Rare earth permanent magnets Sm2(Co, Fe, Cu, Zr)17 for high temperature applications

2008 ◽  
Vol 26 (3) ◽  
pp. 378-382 ◽  
Author(s):  
Long PENG ◽  
Qiuhui YANG ◽  
Huaiwu ZHANG ◽  
Guangliang XU ◽  
Ming ZHANG ◽  
...  
Keyword(s):  
Rare Earth ◽  
High Temperature ◽  
Permanent Magnets ◽  
Temperature Applications

scholarly journals High Temperature Superconducting Non-insulation Closed-loop Coils for Electro-dynamic Suspension System

2021 ◽  
Author(s):  
Li Lu ◽  
Wei Wu ◽  
Xin Yu ◽  
Zhijian Jin
Keyword(s):  
High Temperature ◽  
Liquid Helium ◽  
High Speed ◽  
Closed Loop ◽  
Permanent Magnets ◽  
Current Model ◽  
Persistent Current ◽  
Magnetomotive Force ◽  
High Temperature Superconducting ◽  
Double Pancake

Null-flux Electro-dynamic suspension (EDS) system promises to be one of the feasible high-speed maglev systems above 600 km/h. On account of its greater current-carrying capacity, superconducting magnet can provide super-magnetomotive force that is required for null-flux EDS system and cannot be provided by electromagnets and permanent magnets. There is already a relatively mature high-speed maglev technology with low temperature superconducting (LTS) magnets as the core, which works in the liquid helium temperature region (T≤4.2 K). 2-Generation high temperature superconducting (HTS) magnet winded by REBa2Cu3O7−δ (REBCO, RE=rare earth) tapes works above 20 K region and do not need to count on liquid helium which is rare on earth. This paper designed HTS no-insulation closed-loop coils applied for EDS system and energized with persistent current switch. The coils can work at persistent current model and has premier thermal quench self-protection. Besides, a full size double-pancake module was designed and manufactured in this paper, and it was tested in liquid nitrogen. The double-pancake module’s critical current is about 54 A and it is capable of working at persistent current model, whose average decay rate measured in 12 hours is 0.58%/day.

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