scholarly journals Modeling of Small DC Magnetic Field Response in Trilayer Magnetoelectric Laminate Composites

2012 ◽  
Vol 2012 ◽  
pp. 1-18 ◽  
Author(s):  
B. Zadov ◽  
A. Elmalem ◽  
E. Paperno ◽  
I. Gluzman ◽  
A. Nudelman ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Piezoelectric Layer ◽  
Permanent Magnets ◽  
Finite Size ◽  
Finite Conductivity ◽  
Electric Field Effect ◽  
Induced Voltage ◽  
The Finite Element Method ◽  
Laminate Composites ◽  
Analytical Result

We consider a magnetoelectric laminate which comprises two magnetostrictive (Ni) layers and an in-between piezoelectric layer (PZT). Using the finite-element method-based software COMSOL, we numerically calculate the induced voltage between the two faces of the PZT piezoelectric layer, by an external homogeneous small-signal magnetic field threading the three-layer Ni/PZT/Ni laminate structure. A bias magnetic field is simulated as being produced by two permanent magnets, as it is done in real experimental setups. For approaching the real materials’ properties, a measured magnetization curve of the Ni plate is used in the computations. The reported results take into account the finite-size effects of the structure, such as the fringing electric field effect and the demagnetization, as well as the effect of the finite conductivity of the Ni layers on the output voltage. The results of the simulations are compared with the experimental data and with a widely known analytical result for the induced magnetoelectric voltage.

Study of an aluminium mixing system based on permanent magnets

2020 ◽  
Vol 39 (1) ◽  
pp. 192-197
Author(s):  
Andrey Morev ◽  
Alexander Aliferov
Keyword(s):  
Magnetic Field ◽  
Permanent Magnets ◽  
Rotation Velocity ◽  
Rotating Magnetic Field ◽  
The Finite Element Method ◽  
Ansys Software ◽  
Angular Rotation ◽  
Content Type ◽  
Maximum Value ◽  
The Magnetic Field

Purpose The purpose of this paper is to investigate the effect of the rotating magnetic field of permanent magnets on the aluminium melt bath. Design/methodology/approach This model was developed in the ANSYS software package and is based on the application of the finite element method and finite volume. Findings The distribution of the velocity of the melt in a cylindrical vertical bath and the dependence of the maximum value of the melt displacement on the angular rotation velocity of the system of permanent magnets is obtained. Originality/value This work focusses on the interaction of the magnetic field of the moving magnets with the molten metal.

MAIN CHARACTERISTICS ELECTRIC VIBRATORS BASED ON A LINEAR MOTOR WITH PERMANENT MAGNETS

2021 ◽  
Vol 4 (3) ◽  
pp. 4-10
Author(s):  
Kamoliddin Oqyolov ◽  
◽  
Nurzod Abduqodirov ◽  
Gulnoza Jalilova ◽  
Nuriddin Abduxakimov
Keyword(s):  
Magnetic Field ◽  
Permanent Magnets ◽  
Experimental Studies ◽  
Calculated Data ◽  
Linear Motor ◽  
Stator Winding ◽  
The Finite Element Method ◽  
Magnetic Forces ◽  
Electro Magnetic ◽  
The Magnetic Field

The design of an electric vibrator created on the basis of a linear motor with permanent magnets is considered, and the calculation of the magnetic field and the electromagnetic force acting on the motor armature is performed by the finite element method. The results of experimental studies confirming the reliability of the obtained calculated data are presented]. The purpose of this work is to study the distribution of the magnetic field and the electro-magnetic forces in a coaxial-linear permanent magnet electric motor (PM), which is the basis for the creation of avibration installationKeywords: vibration, magnets, magnetic induction, stator winding, electric vibrator

scholarly journals A Novel Augmented Railgun Using Permanent Magnets

2019 ◽  
Vol 8 (1) ◽  
pp. 99-105
Author(s):  
M. B. Heydari ◽  
M. Asgari ◽  
L. Gharib ◽  
A. Keshtkar ◽  
N. Jafari ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Permanent Magnet ◽  
Lorentz Force ◽  
Permanent Magnets ◽  
Pulse Current ◽  
Current Source ◽  
The Finite Element Method ◽  
Current Densities ◽  
Constant External Magnetic Field ◽  
The Magnetic Field

A novel augmented railgun using a permanent magnet is proposed in this paper. The effects of the permanent magnet on the magnetic field and distribution of current density have been investigated. High current densities in the railguns can lead to high local temperature and erosion of the rails. Therefore, the current densities in the rails and armature should be decreased without the reduction of the Lorentz force which is required for acceleration. For this purpose, augmentation of the magnetic field can be used as an effective method. The Finite Element Method (FEM) simulations have been applied in this article to analyze the performance of the railgun in the presence of the magnets. Two augmented railgun structures have been introduced to produce a constant external magnetic field. For both structures, augmented railgun characteristics are studied in comparison to the railgun without the augmentation. The results show that augmentation with permanent magnet increases railgun efficiency, especially in low current railguns. For pulse current source I=30kA, Lorentz force of the augmented railgun with four magnets is 2.02 times greater than the conventional railgun.

Magnetic Field and Circuit Parameters in an Electromagnetic Generator Supporting a Rotary MR Damper

2013 ◽  
Vol 198 ◽  
pp. 340-347
Author(s):  
Bogdan Sapiński
Keyword(s):  
Magnetic Field ◽  
Magnetic Flux ◽  
Permanent Magnets ◽  
Mr Damper ◽  
Magnetic Flux Density ◽  
Induced Voltage ◽  
Time Patterns ◽  
Density Vector ◽  
Electromagnetic Generator ◽  
Power And Energy

This paper summarises the results of numerical calculations of magnetic field and circuit parameters in an electromagnetic generator supplying a rotary MR damper. The design and operating principles of the generator are outlined. The distribution of the magnetic flux density vector is obtained, other parameters include its modulus, the magnetic flux from permanent magnets and time patterns of induced voltage and current in the control coil of the damper, power and energy of magnetic field in this coil at different rotational speeds of the induction with respect to the armature.

Basic Statements of Research and Magnetic Field of Axial Excitation Inductor Generator

2011 ◽  
Vol 28 (1) ◽  
pp. 49-52
Author(s):  
Igors Stroganovs ◽  
Andrejs Zviedris
Keyword(s):  
Magnetic Field ◽  
Finite Element Method ◽  
Finite Element ◽  
Magnetic Flux ◽  
Magnetic System ◽  
System Optimization ◽  
Magnetic Saturation ◽  
The Finite Element Method ◽  
Flux Linkage ◽  
Axial Excitation

Basic Statements of Research and Magnetic Field of Axial Excitation Inductor GeneratorIn this work the main features of axial excitation inductor generators are described. Mathematical simulation of a magnetic field is realized by using the finite element method. The objective of this work is to elucidate how single elements shape, geometric dimensions and magnetic saturation of magnetic system affect the main characteristics of the field (magnetic induction, magnetic flux linkage). The main directions of a magnetic system optimization are specified.

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.

scholarly journals Calculation of Transient Magnetic Field and Induced Voltage in Photovoltaic Bracket System during a Lightning Stroke

2021 ◽  
Vol 11 (10) ◽  
pp. 4567
Author(s):  
Xiaoqing Zhang ◽  
Yaowu Wang
Keyword(s):  
Magnetic Field ◽  
Time Derivative ◽  
Equivalent Circuit Model ◽  
Magnetic Flux Density ◽  
Induced Voltage ◽  
Lightning Stroke ◽  
Transient Magnetic Field ◽  
Lightning Current ◽  
Time Space ◽  
The Magnetic Field

An effective method is proposed in this paper for calculating the transient magnetic field and induced voltage in the photovoltaic bracket system under lightning stroke. Considering the need for the lightning current responses on various branches of the photovoltaic bracket system, a brief outline is given to the equivalent circuit model of the photovoltaic bracket system. The analytic formulas of the transient magnetic field are derived from the vector potential for the tilted, vertical and horizontal branches in the photovoltaic bracket system. With a time–space discretization scheme put forward for theses formulas, the magnetic field distribution in an assigned spatial domain is determined on the basis of the lightning current responses. The magnetic linkage passing through a conductor loop is evaluated by the surface integral of the magnetic flux density and the induced voltage is obtained from the time derivative of the magnetic linkage. In order to check the validity of the proposed method, an experiment is made on a reduced-scale photovoltaic bracket system. Then, the proposed method is applied to an actual photovoltaic bracket system. The calculations are performed for the magnetic field distributions and induced voltages under positive and negative lightning strokes.

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