Study on the Interaction Law between the Shape Parameters and Permanent-Magnetic Adhesive Force of Railway Permanent-Magnetic Track Brake Equipment

2015 ◽  
Vol 736 ◽  
pp. 121-126
Author(s):  
Xin Yu Wu ◽  
Xiao Shan Lu ◽  
Jian Yong Zuo
Keyword(s):  
Mathematic Model ◽  
Adhesive Force ◽  
Shape Parameters ◽  
Basic Principles ◽  
Magnetic Attraction ◽  
Interaction Law ◽  
Magnetic Induction Intensity ◽  
The Magnetic Field ◽  
Brake Device ◽  
Magnet Yoke

This paper systematically analyzes the interaction law on how the shape parameters of brake magnet yoke affect the magnetic field distribution and the permanent-magnetic attraction by means of parameterized finite element numerical calculations based on the basic principles of train permanent track brake device and the mathematic model of permanent-magnetic attraction [1]. It is found: the permanent-magnetic attraction decreases with the increase of the width of rotor partition board and maximum value of the attraction appears at 16-20nm; the attraction slowly increases along with the increment of slipper chamfering but will decrease when the magnetic induction intensity of the material is saturated; the increase of the rotating angle of rotational magnetic axis leads to decrease of permanent-magnetic attraction; the vertical air gap between permanent-magnetic track brake and steel rail will make the attraction dramatically drop; and the slipper wear almost has little impact on the attraction. The shape parameters of magnetic track brake should be optimized in design by considering the permanent-magnetic attraction so that the efficiency of the brake can be brought into full play.

Influence of Applied Magnetic Field on a Wire-Plate Electrostatic Precipitators Under Multi-Field Coupling

2013 ◽  
Vol 135 (8) ◽  
Author(s):  
Jian-Ping Zhang ◽  
Yong-Xia Dai ◽  
Jiong-Lei Wu ◽  
Jian-Xing Ren ◽  
Helen Wu ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Applied Magnetic Field ◽  
Fine Particles ◽  
Collection Efficiency ◽  
Mathematic Model ◽  
Average Diameter ◽  
Dust Particles ◽  
Particle Dynamic ◽  
Electrostatic Precipitators ◽  
The Magnetic Field

The aim of this work is to find an effective method to improve the collection efficiency of electrostatic precipitators (ESPs). A mathematic model of an ESP subjected to the external magnetic field was proposed. The model considered the coupled effects between the gas flow field, particle dynamic field and electromagnetic field. Particles following a Rosin-Rammler distribution were simulated under various conditions and the influence of the magnetic field density on the capture of fine particles was investigated. The collection efficiency and the escaped particle size distribution under different applied magnetic field intensities were discussed. Particle trajectories inside the ESP under aerodynamic and electromagnetic forces were also analyzed. Numerical results indicate that the collection efficiency increases with the increase of applied magnetic field. It was also found that a stronger applied magnetic field results in a larger particle deflection towards the dust collection plates. Furthermore, the average diameter of escaping particles decreases and the dispersion of dust particles with different sizes increases with the increasingly applied magnetic field. Finally, the average diameter decreases almost linearly with the magnetic field until it drops to a certain value. The model proposed in this work is able to obtain important information on the particle collection phenomena inside an industrial ESP under the applied magnetic field.

scholarly journals Numerical Simulation on the Brake Effect of FAC-EMBr and EMBrRuler in the Continuous Casting Mold

Processes ◽  
2020 ◽  
Vol 8 (12) ◽  
pp. 1620
Author(s):  
Zhuang Li ◽  
Lintao Zhang ◽  
Yanming Bao ◽  
Danzhu Ma
Keyword(s):  
Magnetic Field ◽  
Molten Steel ◽  
Casting Speed ◽  
Submerged Entry Nozzle ◽  
Pole Position ◽  
Level Fluctuation ◽  
Steel Flow ◽  
Magnetic Poles ◽  
Magnetic Induction Intensity ◽  
The Magnetic Field

The brake effect of the freestanding adjustable combination electromagnetic brake (FAC-EMBr) and EMBr ruler on the behavior of molten steel flow and the level fluctuation were investigated with the numerical method. The effects of the horizontal magnetic pole position (EMBr ruler), magnetic induction intensity, and casting speed on two types of electromagnetic brakes were studied. The numerical simulation results show that the magnetic field caused by the EMBr ruler is mainly distributed under the submerged entry nozzle (SEN), and it is very weak nearby the meniscus area. After the FAC-EMBr is applied, the magnetic field is mainly distributed in the area below the submerged entry nozzle, the upper roll region, and in the meniscus region. The application of the electromagnetic brake can effectively suppress the impact of the jet and decrease the molten steel velocity in the meniscus area. The brake effect of the EMBr ruler on the behavior of the molten steel flow and the level fluctuation is significantly influenced by the horizontal magnetic pole position. The increasing of the magnetic flux density can significantly increase the velocity of molten steel in the upper roll region and lead to an intense fluctuation in the steel/slag interface, as the horizontal magnetic field cannot cover the three key regions. The brake effect of the FAC-EMBr is less influenced by the variation of the process parameters due to the addition of vertical magnetic poles. Additionally, the “secondary braking effect” of the vertical magnetic poles can help to lower the increase of velocity in the upper roll region caused by the excessive magnetic induction intensity and the high casting speed. Therefore, even under the high casting speed conditions, the application of a new type of FAC-EMBr is also an efficient way to suppress the molten steel flow and level fluctuation at the meniscus area and decrease the possibility of slag entrapment.

scholarly journals Alternative Approach for the Calculation of Magnetic Field due to Magnet for Magnetic Field Visualization and Evaluation

2020 ◽  
Vol 15 (1) ◽  
pp. 150-160
Author(s):  
Kishor Kaphle ◽  
Gyanendra Karki ◽  
Amrit Panthi
Keyword(s):  
Magnetic Field ◽  
Permanent Magnet ◽  
Field Distribution ◽  
Permanent Magnets ◽  
Magnetic Field Distribution ◽  
Geometrical Shape ◽  
Shape Transformation ◽  
Basic Principles ◽  
Alternative Approach ◽  
The Magnetic Field

 The magnetic field of different geometry of the permanent magnet is analytically calculated by using basic principles of the magnetism in very easier approach. Concept of origin shifting and geometrical shape transformation are used to formulate the formula for cuboidal, cubical and cylindrical permanent magnets. This concept can be used for the analysis of magnetic field distribution in space around for permanent magnet as well as electromagnet in a very easier approach. Handy and simplified software is made to calculate the magnetic field due to permanent magnet and electromagnet at any desired position on space. Magnetic field visualization is also done in both magnitude and direction by using MATLAB.  

The Research of Capacitance Characteristics of MRF

2012 ◽  
Vol 246-247 ◽  
pp. 1096-1101
Author(s):  
Song Wang ◽  
Guo Tian He ◽  
Li Song ◽  
Ze Yu Xu ◽  
Ying Chun Ran
Keyword(s):  
Magnetic Field ◽  
Dielectric Constant ◽  
Electrical Characteristics ◽  
Field Change ◽  
Aircraft Manufacturing ◽  
Magnetic Field Change ◽  
Capacitance Characteristics ◽  
Magneto Rheological ◽  
Magnetic Induction Intensity ◽  
The Magnetic Field

With the development of theory that research on Magneto-Rheological Fluids (MRF), the MRF have been used in many fields in our life. The electrical characteristics of MRF can be widely used in automatic control, medical, automotive, aircraft manufacturing and many other areas .Firstly, this article have derived the formula of MRF between capacitance and Dielectric constant, made the Capacitors which can load the MRF. And then we measure the change of capacitance which is filled with the MRF when the time of magnetic field change, And we also measure the sensitivity of the dielectric constant of different concentrations of MRF as the magnetic field changes. And at last, we have made the curve of the capacitance - magnetic induction intensity the experimental results have been analyzed. We have the conclusion that when the magnetic field increases, the dielectric constant is also increases, resulting in increased capacitance of the conclusions of MRF. Introduction

Microstructure and Mechanical Properties of TC4 Titanium Alloy Subjected to High Static Magnetic Field

2017 ◽  
Vol 898 ◽  
pp. 345-354 ◽  
Author(s):  
Gui Rong Li ◽  
Fang Fang Wang ◽  
Hong Ming Wang ◽  
Jiang Feng Cheng
Keyword(s):  
Magnetic Field ◽  
Titanium Alloy ◽  
Dislocation Density ◽  
Static Magnetic Field ◽  
Micro Hardness ◽  
Tc4 Titanium Alloy ◽  
Tc4 Alloy ◽  
Deformation Ability ◽  
Magnetic Induction Intensity ◽  
The Magnetic Field

The TC4 titanium alloy was subjected to high static magnetic field (HSMF) treatment with different magnetic induced intensities (B=0、1T、2T、3T、4T、5T、6T and 7T). The effects of B on the texture, dislocation density, grain size, tensile properties and micro-hardness of TC4 titanium alloy were investigated, and the influence mechanism of magneto-plastic effect on the plastic deformation ability of titanium alloy was also been studied. The results showed that the dislocation density had been increased after the HSME treatment. It reached a maximum when B=2 T, which was enhanced by 1.6 times compared to that of the untreated samples. In the view of quantum scale,the magnetic field promoted the transition of radical pairs from singlet to triplet state, which caused the movement of dislocation, led to the dislocation depinning from the depinning center, and increased the flexibility of dislocation. Subsequently, the inevitability of optimized 2T parameter was further discussed in the dislocation pile-up. Furthermore, the magnetic field not only promoted the orientation preference of crystal plane along the slipping direction, but also had the effect on the grain refinement. Meanwhile the elongation had been increased due to HSMF treatment. The average elongation of TC4 alloy was 13.12% which was enhanced by 31.07% compared to that of the untreated sample which was 10.01%. And, the elongation increased with the increment of magnetic induction intensity B. The HSME treatment could also play a role in hardening alloys. When B=2 T the micro-hardness was 344.88 HV, which was increased by 8.09% compared to that without treatment. The micro-hardness was consistent with the change of the "point" of the dislocation density, which was characterized by dislocation strengthening.

Simulation Research on the Magnetic Field of the Positioning Permanent Magnet for MEMS inside Human Body Based on Ansoft

2014 ◽  
Vol 596 ◽  
pp. 67-71
Author(s):  
Xiu Quan Liu ◽  
Yan Hong Li
Keyword(s):  
Magnetic Field ◽  
Permanent Magnet ◽  
Magnetic Dipole ◽  
Human Body ◽  
Magnetic Induction ◽  
Dipole Model ◽  
Magnetization Direction ◽  
Simulation Research ◽  
Magnetic Induction Intensity ◽  
The Magnetic Field

the magnetic dipole model of the cylindrical permanent magnet was introduced. Then, based on Ansoft software, the simulation model of the cylindrical permanent magnet was established, and the influence of some parameters, such as the height, radius and magnetization direction on the magnetic induction intensity ,were studied; at the same time, under these two models the calculation was compared, the result shows the the magnetic dipole model is applied on condition that distance is nine times greater than the cylindrical permanent magnet size.

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.

Research on Axial Magnetic Force and Rotor Mechanical Stress of an Air-Cored Axial-Flux Permanent Magnet Machine Based on 3D FEM

2011 ◽  
Vol 105-107 ◽  
pp. 160-163
Author(s):  
Yong Juan Cao ◽  
Yun Kai Huang ◽  
Long Jin
Keyword(s):  
Finite Element ◽  
Permanent Magnet ◽  
Power Density ◽  
Magnetic Force ◽  
Maximum Stress ◽  
3D Fem ◽  
Axial Flux ◽  
Element Analysis ◽  
Magnetic Attraction ◽  
The Magnetic Field

Due to its compact construction and high power density, the axial-flux permanent-magnet (AFPM) machine with coreless stator has obtained more and more attention and interest from researchers. For an AFPM machine with coreless stator, the axial magnetic attraction force may cause the rotors’ deflection and affect the machine’s reliability. In this paper, the magnetic field and the rotor mechanical strength of a coreless stator AFPM machine are studied. Finite-element method and analytic method are both used to calculate the axial attraction magnetic force between the two rotor discs. Structure finite-element analysis is used to simulate the maximum stress and deflection due to the axial magnetic force. The research is very significant to the power density elevation of the AFPM machine.

Measurement of Helmholtz Coil

2015 ◽  
Vol 738-739 ◽  
pp. 893-898
Author(s):  
Jun Feng Zhu ◽  
Xin Yan ◽  
Ling Ling Zhou ◽  
Xiao Xin Zhao
Keyword(s):  
Magnetic Field ◽  
Uniform Magnetic Field ◽  
Helmholtz Coil ◽  
Basic Principles ◽  
Circle Center ◽  
Coil Axis ◽  
Coordinate Origin ◽  
Field Measuring ◽  
Field Lines ◽  
The Magnetic Field

Based on the basic principles of electromagnetism, the application of Shanghai Fudan-day Welcomes UNESCO Instruments Ltd. THQHC-1 type Helmholtz coil magnetic field measuring instrument for measuring coil uniform magnetic field generates a magnetic field on the carrier to get round the coil axis, online circle center at (coordinate origin) at the maximum magnetic field strength. Starting from the coordinate origin, to the sides, the magnetic field lines accelerate the decline, when the distance exceeds the coil radius, the decelerating decline. Conclusions for the understanding of a uniform magnetic field reference.

Temperature suppression of metal panel in electromagnetic field

Circuit World ◽  
2020 ◽  
Vol 46 (4) ◽  
pp. 317-324
Author(s):  
Guochao Zheng ◽  
Fuli Wang ◽  
Baiping Yan ◽  
Runting Cheng
Keyword(s):  
Permanent Magnet ◽  
Magnetic Induction ◽  
Permanent Magnets ◽  
Magnetic Field Intensity ◽  
Metal Plate ◽  
Content Type ◽  
Magnetic Induction Intensity ◽  
Metal Panels ◽  
The Magnetic Field ◽  
Field Intensity Distribution

Purpose The purpose of this study is to suppress the temperature rise of high voltage wall bushing metal plate. Design/methodology/approach First, the authors built a model of a traditional metal plate and got the magnetic field intensity distribution by FEA tools. Optimized according to the magnetic field intensity distribution, the authors slot the traditional metal plate and embed permanent magnets in the slot. Finally, the authors got the temperature distribution diagrams of the above three cases at different current levels by FEA tools. Findings Slotted metal plate is beneficial to suppress magnetic induction intensity, but the improvement of the magnetic induction intensity uniformity is not obvious. The method of embedding a permanent magnet in a slotted metal plate can optimize the magnitude and uniformity of the magnetic induction intensity in the metal plate. The larger the current passing through the metal plate, the better the temperature suppression effect of the slotted metal plate and the slotted metal plate embedded in the permanent magnet. Originality/value The effect of structural factors, slotting plate and setting permanent magnets on slots on the temperature of supporting plate is studied. The paper proposes two methods, slotting metal panels and embedding permanent magnet metal panels, to solve the problems of eddy current loss and high calorific value of the panel, which is of great significance to the safety of the grid equipment.

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