scholarly journals Simulation of the magnetic field generated by square shape Helmholtz coils

2016 ◽  
Vol 40 (23-24) ◽  
pp. 9835-9847 ◽  
Author(s):  
Ronald Hurtado-Velasco ◽  
Jesus Gonzalez-Llorente
Keyword(s):  
Magnetic Field ◽  
Helmholtz Coils ◽  
The Magnetic Field

scholarly journals Magnetic field computation and simulation of the coil systems using Comsol software

2018 ◽  
Vol 160 ◽  
pp. 01006 ◽  
Author(s):  
Ivan Zatonov ◽  
Pavel Baranov ◽  
Andrey Kolomeycev
Keyword(s):  
Magnetic Field ◽  
Axial Direction ◽  
Calibration System ◽  
Method Of Calculation ◽  
Helmholtz Coils ◽  
Magnetic Field Homogeneity ◽  
Different Types ◽  
Field Homogeneity ◽  
Magnetic Field Computation ◽  
The Magnetic Field

The article considers the calibration system computation with the inhomogeneity of magnetic field less than 0.1 %. Method of calculation is described. The numerical simulation using finite-element analyze was made for such system as: Helmholtz coils, improved Helmholtz coils, four and six coils system. Authors made the calculation of the magnetic field homogeneity toward axial direction. Based on procure results, authors analyzed magnetic field homogeneity and compared different types of coil systems.

scholarly journals Effect of Electromagnetic Field (EMF) and Electric Field (EF) on Some Behavior of Honeybees (Apis melliferaL.)

2019 ◽  
Author(s):  
Yaşar Erdoğan ◽  
Mahir Murat Cengiz
Keyword(s):  
Magnetic Field ◽  
Electric Field ◽  
Helmholtz Coils ◽  
Electro Magnetic Field ◽  
Sugar Syrup ◽  
The Earth ◽  
Rapid Spread ◽  
Electrical Devices ◽  
Electro Magnetic ◽  
The Magnetic Field

ABSTRACTGeomagnetic field can be used by different magnetoreception mechanisms, for navigation and orientation by honeybees. The present study analyzed the effects of magnetic field on honeybees. This study was carried out in 2017 at the Bayburt University Beekeeping Application Station. In this study, the effect of Electro Magnetic field (EMF) and electric field (EF) on the time of finding the source of food of honeybees and the time of staying there were determined. The honeybees behaviors were analyzed in the presence of external magnetic fields generated by Helmholtz coils equipment. The Electro Magnetic field values of the coils were fixed to 0 μT (90mV/m), 50 μT (118 mV/m), 100 μT (151 mV/m), 150 μT (211 mV/m), 200 μT (264 mV/m). Petri dishes filled with sugar syrup were placed in the center of the coils. According to the study, honeybees visited at most U1 (mean =21.0±17.89 bees) and at least U5 (mean =10.82±11.77 bees). Honeybees waited for the longest time in U1 (mean =35.27±6.97 seconds) and at least in U5 (mean =12.28±5.58 seconds). According to the results obtained from this first study showed that honeybees are highly affected by electromagnetic radiation and electric field.SummaryHoneybees uses the magnetic field of the earth to to determine their direction. Nowadays, the rapid spread of electrical devices and mobile towers leads to an increase in man-made EMF. This causes honeybees to lose their orientation and thus lose their hives.

The Calibration Method of Helmholtz Coils for the Permanent Magnet

2014 ◽  
Vol 1006-1007 ◽  
pp. 849-852
Author(s):  
Rui Fen Hou ◽  
Zhi Gao Zhang ◽  
Lu Dai ◽  
Wen Jie Gong ◽  
An Li Lin
Keyword(s):  
Magnetic Field ◽  
Field Strength ◽  
Magnetic Field Strength ◽  
Geomagnetic Field ◽  
Current Method ◽  
Calibration Method ◽  
Measurement Methods ◽  
Helmholtz Coils ◽  
Calibration Uncertainty ◽  
The Magnetic Field

The current method is presented to calibrate the constant of Helmholtz coils. Two measurement methods of magnetic field strength are proposed and compared. In order to improve the accuracy, the influence of geomagnetic field is eliminated by changing direction of the magnetic field of Helmholtz coils. When the magnetic field strength is measured by Guassmeter, the calibration uncertainty is 0.12% (k=2). When the magnetic field strength is measured by Fluxmeter and search coil, the calibration uncertainty is 0.30% (k=2).

scholarly journals The Numerical Simulation of the Shielded Helmholtz Coils System Magnetic Field

2018 ◽  
Vol 155 ◽  
pp. 01038
Author(s):  
Ivan Zatonov ◽  
Pavel Baranov
Keyword(s):  
Magnetic Field ◽  
Numerical Simulation ◽  
Axial Direction ◽  
Magnetic Flux Density ◽  
Magnetic Field Inhomogeneity ◽  
Field Inhomogeneity ◽  
Functional Connection ◽  
Axial Coordinate ◽  
Helmholtz Coils ◽  
The Magnetic Field

This article describes the calculation of the magnetic field in the axial direction for the Helmholtz coil. The inhomogeneity of the magnetic field for this coil system is calculated. Authors defined the functional connection of the magnetic flux density in the system center from the antimagnetic shield thickness in two ways: iron and Finemet alloy shield. The dependency graph of the magnetic field inhomogeneity in the center of shielded Helmholtz coils system from the axial coordinate value is estimated

scholarly journals Simulations of the Behaviour of Steel Ferromagnetic Fibres Commonly Used in Concrete in a Magnetic Field

Materials ◽  
2021 ◽  
Vol 15 (1) ◽  
pp. 128
Author(s):  
Kateřina Nováková ◽  
Kristýna Carrera ◽  
Petr Konrád ◽  
Karel Künzel ◽  
Václav Papež ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Numerical Model ◽  
Fresh Concrete ◽  
Single Fibre ◽  
Magnetic Saturation ◽  
Experimental Setup ◽  
Fibre Reinforcement ◽  
Helmholtz Coils ◽  
Fibre Size ◽  
The Magnetic Field

The efficiency of fibre reinforcement in concrete can be drastically increased by orienting the fibres using a magnetic field. This orientation occurs immediately after pouring fresh concrete when the fibres can still move. The technique is most relevant for manufacturing prefabricated elements such as beams or columns. However, the parameters of such a field are not immediately apparent, as they depend on the specific fibre reaction to the magnetic field. In this study, a numerical model was created in ANSYS Maxwell to examine the mechanical torque acting on fibres placed in a magnetic field with varying parameters. The model consists of a single fibre placed between two Helmholtz coils. The simulations were verified with an experimental setup as well as theoretical relationships. Ten different fibre types, both straight and hook-ended, were examined. The developed model can be successfully used to study the behaviour of fibres in a magnetic field. The fibre size plays the most important role together with the magnetic saturation of the fibre material. Multiple fibres show significant interactions.

scholarly journals Magnetic field computation and simulation of the coil systems using Comsol software

2018 ◽  
Vol 158 ◽  
pp. 01032
Author(s):  
Ivan Zatonov ◽  
Pavel Baranov ◽  
Andrey Kolomeycev
Keyword(s):  
Magnetic Field ◽  
Axial Direction ◽  
Calibration System ◽  
Method Of Calculation ◽  
Helmholtz Coils ◽  
Magnetic Field Homogeneity ◽  
Different Types ◽  
Field Homogeneity ◽  
Magnetic Field Computation ◽  
The Magnetic Field

The article considers the calibration system computation with the inhomogeneity of magnetic field less than 0.1 %. Method of calculation is described. The numerical simulation using finite-element analyze was made for such system as: Helmholtz coils, improved Helmholtz coils, four and six coils system. Authors made the calculation of the magnetic field homogeneity toward axial direction. Based on procure results, authors analyzed magnetic field homogeneity and compared different types of coil systems.

scholarly journals Performance Evaluation of a Magnetically Actuated Capsule Microrobotic System for Medical Applications

Micromachines ◽  
2018 ◽  
Vol 9 (12) ◽  
pp. 641 ◽  
Author(s):  
Qiang Fu ◽  
Songyuan Zhang ◽  
Shuxiang Guo ◽  
Jian Guo
Keyword(s):  
Magnetic Field ◽  
Experimental Result ◽  
Positioning System ◽  
Driving System ◽  
Helmholtz Coils ◽  
Magnetically Actuated ◽  
Rotational Magnetic Field ◽  
Ring Magnet ◽  
Medical Diagnose ◽  
The Magnetic Field

The paper aims to propose a magnetic actuated capsule microrobotic system, which is composed of a magnetically actuated microrobot with a screw jet mechanism, a driving system, and a positioning system. The magnetically actuated microrobot embedded an O-ring magnet as an actuator has potential for achieving a particular task, such as medical diagnose or drug delivery. The driving system composes of a three axes Helmholtz coils to generate a rotational magnetic field for controlling the magnetically actuated microrobot to realize the basic motion in pipe, e.g., forward/backward motion and upward/downward motion. The positioning system is used to detect the pose of the magnetically actuated microrobot in pipe. We will discuss the shape of the Helmholtz coils and the magnetic field around the O-ring magnet to obtain an optimal performance of the magnetically actuated microrobot. The experimental result indicated that the microrobot with screw jet motion has a flexible movement in pipe by adjusting the rotational magnetic field plane and the magnetic field changing frequency.

Article

1998 ◽  
Vol 76 (4) ◽  
pp. 305-310
Author(s):  
W A van Wijngaarden ◽  
J Clarke
Keyword(s):  
Magnetic Field ◽  
Electric Field ◽  
Parallel Plate ◽  
Neutral Atom ◽  
Energy Minimum ◽  
Parallel Plate Capacitor ◽  
Atom Trap ◽  
Helmholtz Coils ◽  
Neutral Atom Trap ◽  
The Magnetic Field

A neutral atom trap is proposed consisting of a magnetic field generated by a pair of anti-Helmholtz coils and a fringing electric field of a parallel plate capacitor. The electric field shifts the energy minimum ofthe trap away from the point where the magnetic field is zero thus preventingatom loss from the trap due to Majorana transitions. This trap offers someadvantages over existing traps that are used to study cold atoms.PACS Nos.: 32.80Pj and 03.75Fi

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