|Table of Contents|

[1] Wang Chao, Yuan Bin, Mao Junfa, Zhang Shuang, et al. Design and implementation of square Helmholtz coilfor uniform magnetic field generation [J]. Journal of Southeast University (English Edition), 2019, 35 (1): 16-21. [doi:10.3969/j.issn.1003-7985.2019.01.003]
Copy

Design and implementation of square Helmholtz coilfor uniform magnetic field generation()
用于激励匀强磁场的方形Helmholtz线圈设计与实现
Share：

Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]

Volumn:
35
Issue:
2019 1
Page:
16-21
Research Field:
Electromagnetic Field and Microwave Technology
Publishing date:
2019-03-30

Info

Title:
Design and implementation of square Helmholtz coilfor uniform magnetic field generation
用于激励匀强磁场的方形Helmholtz线圈设计与实现
Author(s):
Wang Chao1;  Yuan Bin1;  Mao Junfa1;  Zhang Shuang2
1School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
2College of Electronic Science and Engineering, Jilin University, Changchun 130021, China
王超1;  袁斌1;  毛军发1;  张爽2
1上海交通大学电子信息与电气工程学院, 上海 200240; 2吉林大学电子科学与工程学院, 长春 130021
Keywords:
proton magnetometer;  square Helmholtz coils;  space utilization rate;  uniform magnetic field
质子磁力仪;  方形Helmholtz线圈;  空间利用率;  匀强磁场
PACS:
TN80
DOI:
10.3969/j.issn.1003-7985.2019.01.003
Abstract:
In order to calibrate electrical instruments and generate a constant magnetic field, a novel design method for square Helmholtz coil is proposed. According to the superposition principle in electromagnetics, the theory of the square Helmholtz coil is established, and the design method is verified by Matlab calculation. Compared with conventional circular Helmholtz coil, the novel square one is with a larger uniform region. Simulation work is conducted in Maxwell, and the distribution of the magnetic field is obtained. The results demonstrate the validation of the applied calculation method of the proposed Helmholtz model. The space utilization rate η is used to make a comparison between the square and circular coils for the uniform region. The square Helmholtz coil is fabricated, the length of a single square coil is 1.5 m, and the amplitude of the magnetic field is controlled by the current. The GSM-19T proton magnetometer is used to measure the amplitude of the magnetic field generated by the square Helmholtz coil. Experimental results indicate that a wide-range variable uniform magnetic field from 0 to 120 μT is generated in the center of Helmholtz coils.
为了标定电子仪器设备, 产生稳恒的磁场, 提出了一种新颖的方形Helmholtz线圈的设计方法.根据电磁场叠加原理, 建立了方形Helmholtz线圈理论模型, 并用Matlab软件验证了模型的正确性.该模型较传统圆形Helmholtz线圈有更大的匀强场区.利用Maxwell软件进行仿真计算, 得到了线圈周围磁场的分布, 仿真结果验证了Helmholtz线圈计算方法的正确性.用空间利用率η比较了方形线圈与传统圆形线圈所产生的匀强磁场范围.制作了方形Helmholtz线圈, 线圈臂长1.5 m, 匀强磁场的大小由输入电流控制.应用GSM-19T型质子磁力仪测量方形Helmholtz线圈激励磁场的幅值.实验表明, 方形Helmholtz线圈中心可产生0~120 μT幅值可调节的均匀电磁场区.

References:

[1] Lenz J, Edelstein S. Magnetic sensors and their applications[J].IEEE Sensors Journal, 2006, 6(3): 631-649. DOI:10.1109/jsen.2006.874493.
[2] Du S Q, Zhang Y J, Jiang J Z. Analytical calculation of electromagnetic torque for surface mounted permanent magnet brushless motors[J].Journal of Shanghai University (English Edition), 2007, 11(3): 309-313. DOI:10.1007/s11741-007-0325-1.
[3] Alamgir A K M, Fang J, Gu C, et al. Square Helmholtz coil with homogeneous field for magnetic measurement of longer HTS tapes[J]. Physica C: Superconductivity, 2005, 424(1/2): 17-24. DOI:10.1016/j.physc.2005.04.019.
[4] Wang J, She S X, Zhang S J. An improved Helmholtz coil and analysis of its magnetic field homogeneity[J].Review of Scientific Instruments, 2002, 73(5): 2175-2179. DOI:10.1063/1.1471352.
[5] Javor E R, Anderson T. Design of a Helmholtz coil for low frequency magnetic field susceptibility testing [C]//IEEE International Symposium on Electromagnetic Compatibility. Denver, CO, USA, 1998: 912-917. DOI:10.1109/ISEMC.1998.750329.
[6] Choi B H, Thai V X, Lee E S, et al. Dipole-coil-based wide-range inductive power transfer systems for wireless sensors[J].IEEE Transactions on Industrial Electronics, 2016, 63(5): 3158-3167. DOI:10.1109/tie.2016.2517061.
[7] Bronaugh E L. Helmholtz coils for EMI immunity testing: Stretching the uniform field area [C]//International Conference on Electromagnetic Compatibility.Washington, DC, USA, 1990:169-172.
[8] Cao Q L, Han X T, Zhang B, et al. Analysis and optimal design of magnetic navigation system using Helmholtz and Maxwell coils[J]. IEEE Transactions on Applied Superconductivity, 2012, 22(3): 4401504. DOI:10.1109/tasc.2011.2174583.
[9] Mihailescu B, Plotog I, Velcea M N. Comparative assessment of Maxwell and Helmholtz coils magnetic field for biotechnological applications[C]//2015 IEEE 21st International Symposium for Design and Technology in Electronic Packaging (SIITME). Brasov, Romania, 2015:157-160. DOI:10.1109/SIITME.2015.7342316.
[10] Lee S G, Kang C S, Chang J W. Square loop coil system for balancing and calibration of second-order SQUID gradiometers[J].IEEE Transactions on Applied Superconductivity, 2007, 17(2): 3769-3772. DOI:10.1109/tasc.2007.898868.
[11] Sample A P, Meyer D A, Smith J R. Analysis, experimental results, and range adaptation of magnetically coupled resonators for wireless power transfer[J].IEEE Transactions on Industrial Electronics, 2011, 58(2): 544-554. DOI:10.1109/tie.2010.2046002.
[12] Chen J, Wang D, Wang Y, et al. An improved 3-D magnetic field generator with larger uniform region [J]. IEEE Transactions on Applied Superconductivity, 2016, 26(7): 1-5. DOI: 10.1109/TASC.2016.2594801.

Memo

Memo:
Biographies: Wang Chao(1990—), male, Ph.D. candidate; Yuan Bin(corresponding author), male, doctor, professor, yuanbin@sjtu.edu.cn.
Foundation item: The National Natural Science Foundation of China(No.61327803).
Citation: Wang Chao, Yuan Bin, Mao Junfa, et al.Design and implementation of square Helmholtz coil for uniform magnetic field generation[J].Journal of Southeast University(English Edition), 2019, 35(1):16-21.DOI:10.3969/j.issn.1003-7985.2019.01.003.
Last Update: 2019-03-20