Interactive visualization of interaction between magnetic flux density and eddy currents in a 3D steady state field

1992 ◽  
Vol 28 (2) ◽  
pp. 1778-1781 ◽  
Author(s):  
H. Yamashita ◽  
T. Johkoh ◽  
E. Nakamae
Keyword(s):  
Steady State ◽  
Magnetic Flux ◽  
Flux Density ◽  
Eddy Currents ◽  
Interactive Visualization ◽  
Magnetic Flux Density

Alternating steady state free precession for estimation of current-induced magnetic flux density: A feasibility study

2015 ◽  
Vol 75 (5) ◽  
pp. 2009-2019 ◽  
Author(s):  
Hyunyeol Lee ◽  
Woo Chul Jeong ◽  
Hyung Joong Kim ◽  
Eung Je Woo ◽  
Jaeseok Park
Keyword(s):  
Steady State ◽  
Magnetic Flux ◽  
Flux Density ◽  
Feasibility Study ◽  
Steady State Free Precession ◽  
Magnetic Flux Density ◽  
Free Precession

Low-Frequency Magnetic Localization of Capsule Endoscopes with an Integrated Coil

2021 ◽  
Vol 6 (1) ◽  
pp. 38
Author(s):  
Samuel Zeising ◽  
Rebecca Seidl ◽  
Angelika Thalmayer ◽  
Georg Fischer ◽  
Jens Kirchner
Keyword(s):  
Magnetic Field ◽  
Magnetic Flux ◽  
Flux Density ◽  
Eddy Currents ◽  
Low Frequency ◽  
Magnetic Sensors ◽  
Video Frame ◽  
Magnetic Flux Density ◽  
Field Source ◽  
Localization Method

Wireless capsule endoscopy is a promising and less invasive alternative to conventional endoscopy. A patient swallows a small capsule with an integrated camera to capture a video of the gastrointestinal tract. For accurate diagnosis and therapy, the capsule position in terms of the travelled distance must be known for each video frame. However, to date, there is no reliable localization method for endoscopy capsules. In this paper, a novel magnetic localization method is proposed. A coil as a magnetic field source is integrated into a capsule and fed with a low-frequency alternating current to prevent static geomagnetic field interference. This alternating magnetic field is measured by twelve magnetic sensors arranged in rings around the abdomen. The coil and the capsule batteries were designed based on the geometry and power supply of a commercially available endoscopy capsule and simulated by COMSOL Multiphysics software. In this way, the coil position and orientation were determined with an accuracy below 1 mm and 1°, respectively. As an analytic model for the magnetic flux density of the coil in that setup, a modified dipole model was derived. It was used to show that the batteries help to increase the amplitude of the magnetic flux density. The model is valid when signals below 100 Hz are applied, and no eddy currents are generated within the batteries. It is concluded that the magnetic flux density generated by the developed coil would be measurable with state-of-the-art magnetic sensors.

scholarly journals Enhanced magnetic flux density mapping using coherent steady state equilibrium signal in MREIT

AIP Advances ◽  
2016 ◽  
Vol 6 (3) ◽  
pp. 035121
Author(s):  
Woo Chul Jeong ◽  
Mun Bae Lee ◽  
Saurav Z. K. Sajib ◽  
Hyung Joong Kim ◽  
Oh In Kwon ◽  
...  
Keyword(s):  
Steady State ◽  
Magnetic Flux ◽  
Flux Density ◽  
Magnetic Flux Density ◽  
State Equilibrium ◽  
Density Mapping

scholarly journals Design of a New 1D Halbach Magnet Array with Good Sinusoidal Magnetic Field by Analyzing the Curved Surface

Sensors ◽  
2021 ◽  
Vol 21 (7) ◽  
pp. 2522
Author(s):  
Guangdou Liu ◽  
Shiqin Hou ◽  
Xingping Xu ◽  
Wensheng Xiao
Keyword(s):  
Magnetic Field ◽  
Magnetic Flux ◽  
Permanent Magnet ◽  
Flux Density ◽  
Permanent Magnets ◽  
Air Gap ◽  
Curved Surface ◽  
Magnetic Flux Density ◽  
Sinusoidal Magnetic Field ◽  
The Magnetic Field

In the linear and planar motors, the 1D Halbach magnet array is extensively used. The sinusoidal property of the magnetic field deteriorates by analyzing the magnetic field at a small air gap. Therefore, a new 1D Halbach magnet array is proposed, in which the permanent magnet with a curved surface is applied. Based on the superposition of principle and Fourier series, the magnetic flux density distribution is derived. The optimized curved surface is obtained and fitted by a polynomial. The sinusoidal magnetic field is verified by comparing it with the magnetic flux density of the finite element model. Through the analysis of different dimensions of the permanent magnet array, the optimization result has good applicability. The force ripple can be significantly reduced by the new magnet array. The effect on the mass and air gap is investigated compared with a conventional magnet array with rectangular permanent magnets. In conclusion, the new magnet array design has the scalability to be extended to various sizes of motor and is especially suitable for small air gap applications.

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