The Suction Characteristics Simulation of Electromagnet Based on Maxwell

2010 ◽  
Vol 455 ◽  
pp. 449-453
Author(s):  
X.L. Cheng ◽  
Lin Chao An ◽  
K. Guo
Keyword(s):  
Magnetic Flux ◽  
Dynamic Characteristic ◽  
Magnetic Induction ◽  
Transient Analysis ◽  
Constant Load ◽  
Field Analysis ◽  
Magnetic Flux Density ◽  
Distribution Map ◽  
Magnetostatic Field ◽  
Magnetic Induction Intensity

This paper makes the analysis to magnetostatic field and transient of electromagnet by using Maxwell. The magnetic-flux density of electromagnet and the distribution map of magnetic induction intensity are obtained and it has been verified that the electromagnet can meet the first pilot valve's open and close completely under the essential security power equipment's condition by the magnetostatic field analysis. Dynamic characteristic of the electromagnet is obtained under the constant load, and has further confirmed the reliability of electromagnet by the transient analysis.

Research on expanding the range of reproduction of magnetic flux density of the DC field of the state primary standard GET12-2011

2020 ◽  
pp. 3-7
Author(s):  
Vladlen Ya. Shifrin ◽  
Denis I. Belyakov ◽  
Alexander E. Shilov ◽  
Denis D. Kosenko
Keyword(s):  
Magnetic Flux ◽  
Magnetic Induction ◽  
Frequency Conversion ◽  
Magnetic Measurements ◽  
Primary Standard ◽  
Uncertainty Budget ◽  
The State ◽  
State Primary Standard ◽  
Magnetic Flux Density ◽  
Constant Field

The results of works aimed at increasing the level of uniformity of measurements of the magnetic induction of a constant field – the basic value in the field of magnetic measurements. A set of equipment for reproducing a unit of magnetic induction of a constant field in the range of 1–25 mT was created and described. The inclusion of this complex in the State primary standard of units of magnetic induction, magnetic flux, magnetic moment and magnetic induction gradient GET 12-2011 will ensure the reproduction and direct transmission of the unit of permanent magnetic induction in the ranges of not only weak (10–3–1 mT), but medium (1–25 mT) and strong (0.025–1 T) magnetic fields. A quantum cesium magnetometer based on the resolved structure of cesium atoms was created to transmit the unit of magnetic induction to the region of medium fields. The procedure for calculating the frequency conversion coefficients to magnetic induction of the created quantum cesium magnetometer is described. The uncertainty budget for reproducing a unit of magnetic induction of a constant field using the created complex is estimated.

Finite-Element Analysis of the Magnetostatic Field of a Coaxial Magnetic Gear Device

2015 ◽  
Vol 764-765 ◽  
pp. 289-293
Author(s):  
Yi Chang Wu ◽  
Han Ting Hsu
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Magnetic Flux ◽  
High Speed ◽  
Field Analysis ◽  
Element Analysis ◽  
Magnetostatic Field ◽  
Speed Reduction ◽  
Dimensional Finite Element ◽  
Magnetic Gear

This paper presents the magnetostatic field analysis of a coaxial magnetic gear device proposed by Atallah and Howe. The structural configuration and speed reduction ratio of this magnetic gear device are introduced. The 2-dimensional finite-element analysis (2-D FEA), conducted by applying commercial FEA software Ansoft/Maxwell, is performed to evaluate the magnetostatic field distribution, especially for the magnetic flux densities within the outer air-gap. Once the number of steel pole-pieces equals the sum of the pole-pair numbers of the high-speed rotor and the low-speed rotor, the coaxial magnetic gear device possesses higher magnetic flux densities, thereby generating greater transmitted torque.

Electromagnetic Nondestructive Testing Model and Surface Magnetic Field Analysis for Circumferential Cracks on Metal Rod

2019 ◽  
Vol 2 (4) ◽  
Author(s):  
Feng Jiang ◽  
Shulin Liu ◽  
Shaojie Xin ◽  
Hongli Zhang
Keyword(s):  
Magnetic Field ◽  
Analytical Model ◽  
Magnetic Induction ◽  
Crack Depth ◽  
Field Analysis ◽  
Surface Magnetic Field ◽  
Circumferential Crack ◽  
Inner Surface ◽  
Magnetic Induction Intensity ◽  
The Magnetic Field

Abstract In this paper, an analytical model for a metal rod with a coating layer is proposed to evaluate circumferential crack from the signals of the surface magnetic field. In the proposed model, magnetic vector equations for four regions of space were built, and series expressions of the magnetic field were proposed by the truncated region eigenfunction method. The calculation results can show the three-dimensional distribution of axial and radial magnetic induction intensities on the surface of a metal rod clearly. In addition, the analytical model is verified by using comsol finite element simulation, which also demonstrates that induced eddy currents on the inner surface of the metal rod with cracks appear to be propelled toward the inner layer of the metal rod and the presence of a circumferential crack directly causes a decrease in the induced eddy current on the inner surface of the rod. The results calculated from the analytical model indicated that the model is capable of providing an accurate variation in the magnetic field due to circumferential cracks at different depths. The analytical results showed that the radial magnetic induction intensity increases by 0.16 × 10−3 T, while the axial magnetic induction intensity decreases by 0.3 × 10−3 T as the crack depth increases from 0 to 3 mm.

scholarly journals STUDY OF ACOUSTIC SOURCE EXCITED BY PULSED MAGNETIC FIELD

2021 ◽  
pp. 2140008
Author(s):  
YANJU YANG ◽  
CHUNLEI CHENG ◽  
WENYAO YANG ◽  
JIE LI ◽  
ZHENGFU CHENG ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Numerical Simulation ◽  
Analytical Solution ◽  
Magnetic Flux ◽  
Flux Density ◽  
Magnetic Induction ◽  
Pulsed Magnetic Field ◽  
Magnetic Flux Density ◽  
Acoustic Source ◽  
Thermoacoustic Imaging

In magnetoacoustic tomography with magnetic induction and magnetically mediated thermoacoustic imaging, tissues are exposed to an alternating field, generating magnetoacoustic and thermoacoustic effects in the tissues. This study aimed to investigate the relationship between magnetoacoustic and thermoacoustic effects in a low-conductivity object put in a Gauss-pulsed alternating magnetic field. First, the derivations of the magnetic flux density and electric field strength induced by a Gauss-pulsed current flowing through the coil based on the theory of electromagnetic field were examined. Second, the analytical solution of the magnetic field was studied by simulation. To validate the accuracy of the analytical solution, the analytical solution and the numerical simulation of the magnetic flux density were compared. It shows that the analytical solution coincides with the numerical simulation well. Then, based on the theoretical analysis of the acoustic source generation, numerical studies were conducted to simulate pressures excited by magnetoacoustic and thermoacoustic effects in low-conductivity objects similar to tissues in the Gauss-pulsed magnetic field. The thermoacoustic effect played a leading role in low-conductivity objects placed in the Gauss-pulsed magnetic field, and the magnetoacoustic effect could be ignored. This study provided the theoretical basis for further research on magnetoacoustic tomography with magnetic induction and magnetically mediated thermoacoustic imaging for pathological tissues.

The Magnetic Field Analysis of Dual-Coil Self-Sensing Actuator

2011 ◽  
Vol 181-182 ◽  
pp. 183-188 ◽  
Author(s):  
Cheng Wu Lin ◽  
Fang Dong ◽  
Hao Zheng ◽  
Hua Yan
Keyword(s):  
Magnetic Field ◽  
Magnetic Induction ◽  
Reference Value ◽  
Element Model ◽  
Field Analysis ◽  
Magnetic Field Analysis ◽  
Intensity Changes ◽  
Working Principle ◽  
Magnetic Induction Intensity ◽  
The Magnetic Field

This paper introduced working principle of dual-coil self-sensing actuator based on magnetically controlled shape memory alloy (MSMA). The ANSYS software was used to establish the finite element model of MSMA dual-coil self-sensing actuator. Edge element method was adopted to analyze the MSMA dual-coil self-sensing actuator's 3-D static magnetic field under the influence of different excitation voltages. The analysis obtained MSMA and silicon steel sheet distribution of magnetic induction intensity and the magnetic field intensity, has further confirmed the reliability of MSMA dual-coil self-sensing actuator, and has given the MSMA length relations along with the magnetic induction intensity changes. The results show that magnetic field analysis has certain reference value to the MSMA practical application.

Simulation Study on the Force of Particles Migrating in Molten Metal under High-Frequency Magnetic Field

2015 ◽  
Vol 1095 ◽  
pp. 851-854
Author(s):  
Hong Ming Wang ◽  
Chang Chen Qu ◽  
Xiao Jian Fan ◽  
Gui Rong Li
Keyword(s):  
Magnetic Flux ◽  
Flux Density ◽  
High Frequency ◽  
Body Force ◽  
Simulation Method ◽  
Magnetic Flux Density ◽  
Basic Principles ◽  
Frequency Magnetic Field ◽  
High Frequency Magnetic Field ◽  
Magnetic Induction Intensity

According to the basic principles of electromagnetism, the magnetic flux density on the surface of the metal melt was calculated by numerical simulation method. The relational expression of the electromagnetic body force and the magnetic flux density was deduced. The results show that the electromagnetic body force in the melt is directly proportional to the square of the magnetic induction intensity. Increasing the electric current, the electromagnetic body force in the melt can be increased effectively. Increasing the frequency, the particular electromagnetic body force within the melt can be increased first and then decreased.

Acoustic End Effects in Magnetohydrodynamic Submerged Vehicular Propulsors—Part 2: Solitary Waves

1994 ◽  
Vol 38 (02) ◽  
pp. 158-163
Author(s):  
John S. Walker ◽  
Samuel H. Brown ◽  
Neal A. Sondergaard
Keyword(s):  
Magnetic Flux ◽  
Wave Front ◽  
Flux Density ◽  
Cross Section ◽  
Magnetic Induction ◽  
Magnetic Flux Density ◽  
Uniform Field ◽  
Field Region ◽  
Coupled Equations ◽  
Fluid Transients

In a magnetohydrodynamic (MHD) seawater propulsion system for a submerged vehicle, a region of high-uniform magnetic induction (magnetic flux density) inside the MHD propulsion channel is separated from the region of essentially zero magnetic induction outside the channel in the seaway by a region of nonuniform, fringing magnetic induction at each end of the channel. This paper treats the propagation of an a periodic fluid transient (solitary wave) which is produced by an arbitrary unit impulse in velocity or pressure at any cross section in the uniform-field region and which propagates through either fringing field region and into the zero-field region outside the channel. The time scale for the transients is sufficiently short that compressive effects are important, so that the fluid transients are acoustic waves. The channel is a straight, rectangular duct with electrically insulating walls and highly conducting walls perpendicular and parallel to the magnetic induction, respectively. The linearized acoustic equations are averaged over each cross section of the channel to obtain a pair of coupled equations governing the average pressure and average axial velocity as functions of the axial coordinate and time. Together these equations represent a simple wave equation with a retarding force which is proportional to the square of the local magnetic flux density. Results are presented for three values of the acoustic interaction parameter N, which is the characteristic ratio of the electromagnetic body force opposing motions across magnetic-induction lines to the inertial "force" in the fluid transients. An abrupt change in velocity produces a wave front which travels at the speed of sound. Without MHD effects, the entire change in velocity or pressure occurs suddenly as the wave front passes. With MHD effects, only part of each change occurs suddenly as the wave front passes, followed by a gradual evolution to reach the entire change. The split between the abrupt and gradual fractions of the entire change depends on N. In previous work, the authors treated the fundamentally different MHD acoustic problem of the transmission of periodic waves from the channel and the previous paper (Walker et al 1992) is Part 1 of the present work.

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