Law Of Electromagnetic Induction Research Articles

Research of the induced voltage’s varying law of the pipe-type energy harvester tumbleweed rover

This paper introduces a novel tumbleweed rover design that employs a pipe-type energy harvester system to harvest electrical power from the wind indirectly. The critical parameters law of electromagnetic induction is studied firstly and then propose a preliminary model of the layout of harvesters. Simulates the motion of the harvester inside a spherical shell to achieve the performance of voltage generation and summarize the varying rules of induced voltage. Given the effect of centrifugal force, we further propose spring as a solution to support magnet to recover reciprocating motion in harvester. Finally, the experiments are implemented based on the simulated model to verify the dependability of the energy harvester and the validity of induced voltages’ varying rules.

Design and Implementation of a Magnetically Actuated Miniature Robotic Fish

At present, most of bio-inspired robotic fish are designed with large sizes and actuated by electric motors. In this paper, an 89-mm-long robotic fish is designed and built, which is capable of swimming fast and turning flexibly. This miniature robotic fish is intended to be used as a tool for animal behavioral research and special underwater missions. Compared with traditional design, the propulsion system is characterized by no motor, which is a magnetic actuator. Bluetooth low energy is utilized for remote control, allowing convenient operation via smart devices. By means of law of electromagnetic induction, the relationship between current and magnetic induction intensity is explored. Further, a novel tail-beat rhythm for magnetic actuator is proposed. Meanwhile, a dynamic modeling of fishlike swimming is constructed based on a Lagrange approach to analyze its propulsive performance. Finally, aquatic experiments verify the effectiveness of the formulated magnetically actuated design scheme along with the conducted theoretical analyses.

Development of Metallic Contaminant Detection System Using RF High-Tc SQUID With Cu Pickup Coil

We developed a metallic contaminant detector using a high-Tc rf-SQUID with a Cu pickup coil for industrial products. For manufacturers producing industrial products, problems arising from metallic contaminants are critical issues. A detection system using a SQUID is a powerful tool for sensitive inspections. However, since the detection width is dependent on the size of the SQUID, multiple sensors are required for practical use. However, such devices are costly and complicated. This is the reason as to why the SQUID system has not been widely used in the field. Therefore, we have recently proposed a new detection system using Faraday's law of electromagnetic induction. The detection section consists of a pair of permanent magnets surrounded by copper wound pickup coils. The output of the pickup coil is remotely connected to a copper wound input coil. The input coil couples magnetically with a SQUID. In this case, the width of the pickup coil can be widened as to be as large as 27 mm in diameter. As compared with 1-ch SQUID direct detection, the width of the new method is three times larger. In this paper, we describe the performance of the system with a conveyor, which uses an LC resonant circuit. By applying the LC resonance, the amplitude increased and the signal to noise ratio ( SNR ) was improved by a factor of two.

Faraday's law of electromagnetic induction in two parallel conductors

Faraday's law of electromagnetic induction in two parallel conductors

Analysis of the Motion of a Pendulum by Using Faraday's Law of Electromagnetic Induction

Analysis of the Motion of a Pendulum by Using Faraday's Law of Electromagnetic Induction

Penanaman Karakter Positif Pelajar Melalui Pembahasan Fenomena-Fenomena Fisika dan Pendekatan Analogi (Hasil Kajian Perkulihan Fisika Dasar)

The discussion results of Fundamental Physics I lecturing, especially the 1st Newton law about movement, law of Lenz, electromagnetic induction, and law of Bernoulli about pressure of flowing fluid show that in the concepts implicitly there is an action-reaction relation between objects. We could analogize these phenomena to the interaction between human being, in the contex of learning we can analogize it to the interaction between educator and students. When the interaction between objects softly occurs (“persuasive”) the reaction is not emerge but when it happen quictly the reaction emerges and it against the change caused by the action. The implementation of the discussion of Physics concept and analogy approach usefull to implant positive characters to the students. The positive characters include honesty, responsibility, respect, empaty, self restraint, modesty, patient, no despondently, diligent, love, and good samaritan, also make the values to be a habit in the mind, feeling, and in action.

Multi-directional electromagnetic vibration energy harvester using circular Halbach array

In this paper, a multi-directional electromagnetic vibration energy harvester (EVEH) using the circular Halbach array (HA) is presented based on the Faraday’s law of electromagnetic induction. The circular HA is a specific arrangement of permanent magnets which could concentrate the magnetic field inside the circular array by a certain rule, while reduce the magnetic field outside the circular array to almost zero at the same time. The HA could break through the limitation of the related published vibration energy harvesters that could work in only one single direction. Thus, it could optimize the collecting efficiency. The experimental results show that the presented harvester could generate considerable electric output power in all vibrating directions. An optimal output power is 9.32 mW at a resonant frequency of 15.40 Hz with an acceleration of 0.5 g (with g=9.8 m/s2) across a 700-turn coil in the vibrating direction of 90°, which is 1.53 times than the minimum optimal one in the direction of 45°. The EVEH using the circular HA could work in all directions and generate considerable electric output power, which validates the feasibility of the EVEH that works in all directions and is beneficial for improving the practical application.

Electric generators and motors: An overview

Starting with Faraday's law of electromagnetic induction in 1831, electric (electromagnetic) machines have been developed ever since as “assembles” of electric and magnetic coupled circuits that convert mechanical to electrical energy (in generators) and vice versa (in motors), via magnetic energy storage. Generators and motors are reversible. The Maxwell four equations (laws) later in 19th Century have prompted the rapid development of all basic (DC. brush and travelling field AC machines by 1900. Then by 1930 AC (alternating current) power (energy) systems evolved by connecting in parallel electric synchronous generators (with voltage boost and buck electric transformers for efficient AC power transmission lines) of rather constant frequency and voltage, driven by turbines (prime movers) that harness fossil (coal, gas or nuclear fuels), thermal or hydro energy. The last 50 years have witnessed a dramatic extension of generators power/unit, renewable energy generators and of variable speed AC motor drives in applications with variable output such as ventilators, pumps compressors, conveyors, orr-mills, electric transport (mobility), industrial automation, robotics, home appliances and info — gadgets. This formidable development, required by the need of more but cleaner energy, was mainly driven by power electronics, better materials, better modeling, design methodologies and digital control. This humble inaugural overview attempts to combine a brief history of electrical generators and motors with recent progress and trends in their design and control, for representative applications.

生徒実験用「電磁誘導法則実験器」の開発 : 検出コイルの形状と起電力の直線性を廻って

生徒実験用「電磁誘導法則実験器」の開発 : 検出コイルの形状と起電力の直線性を廻って

新型插入式电磁流量计流场适应性研究

插入式电磁流量计工作原理是基于法拉第电磁感应定律，管道中气体、液体介质流经传感器探头时切割磁感线，引起磁感应电动势，因此探头周边流场的分布情况对流量计的测量结果会产生比较大的影响。文中采用Fluent流体仿真软件对电磁流量计传感器的多种几何模型进行仿真分析，观察传感器在流场中形成的高速绕流区域和边界层，研究传感器周边流场变化给电极带来的影响。提出将传感器的物理结构进行优化，将传感器的探头位置设计安装于传感器两边，并将圆柱体的物理结构模型改成椭圆型和椭圆水滴型。通过进一步建模仿真发现，椭圆水滴型传感器测量的信号强度更强、稳定性也较高。 The working principle of the inserted electromagnetic flowmeter is based on Faraday’s law of electromagnetic induction, when the gas or liquid medium passes through the sensor probe, the magnetic induction line is cut and the magnetic induction electromotive force is generated. Therefore, the distribution of the flow field around the probe will have a great influence on the measurement results of the flowmeter. In this paper, fluent fluid simulation software is used to simulate and analyze various geometric models of electromagnetic flowmeter sensors. The high-speed flow around the sensor and the boundary layer are observed, and the influence of the flow field around the sensor on the electrode is studied. The physical structure of the sensor is op-timized; the probe position is designed and installed on both sides of the sensor, and the physical structure model of the cylinder is changed into elliptical and elliptic water drop type. Through further modeling and simulation, it is found that the signal intensity and stability of elliptic water drop sensor are higher.

Defects and Correction Theories of Electromagnetics

<p class="1Body">Experiments show that, there is the electrostatic field around the permanent magnet; since the electromagnetics can not explain this phenomenon, it can be concluded that there are some defects in electromagnetics. This paper makes an analysis of the defects of electromagnetics from fourteen aspects. It is noted that, the basic defect of electromagnetics is that there is no explanation of any inherent causes and physical processes of electromagnetic induction, displacement current, Lorentz force and other surface phenomena. Moreover, it may also lead us to make incorrect inferences in the theoretical analysis of electromagnetics, e.g. the same direction of action and reaction, infinitely high kinematic velocity of magnetic field, etc. It can be seen from analysis of all electromagnetic phenomena that, all the electromagnetic phenomena will be inevitably accompanied by an electron motion; and the electron motion is bound to take effect through an electric field; therefore, the analysis of motion in an electric field is the basis for analysis of all electromagnetic phenomena. This paper proposes seven rules for analysis of motion in an electric field, analyzes the uniform motion and variable motion in an electric field on the basis of such rules, clarifies the inherent causes of Lorentz force, theoretically qualitatively and quantitatively demonstrates why there exists the electrostatic field at some locations around the permanent magnet, and considers that all the magnetic phenomena are resulted from the contraction of electric field in the direction of motion, which is derived from the natural law of constant velocity of light, and therefore all the electromagnetic phenomena is rooted in the constant velocity of light. Through the analysis of variable motion in an electric field, this paper proves the law of displacement current and electromagnetic induction, clarifies the physical processes of such phenomena, deduces the law of total current, explains why electric field strength and magnetic field strength of electromagnetic wave must be in same phase and why a plane wave has the electric and magnetic fields only with a certain length but no source, and considers that neither fast nor slow propagation velocity of electromagnetic wave is good and that the actual velocity of light is the ideal velocity of light.</p>

The Faraday law of induction for an arbitrarily moving charge

The Faraday law of electromagnetic induction for an arbitrarily moving charge is generalized and the expression for the force acting on the charge in an alternating magnetic field is obtained. It is shown that besides the Lorentz force perpendicular to the velocity of the particle, the Faraday force parallel to the particle velocity and proportional to it is acting on the charge, too. The equations of motion of the charged particle and the magnetic moment are obtained in the time-varying magnetic field. The problems of induction acceleration of charged particles (betatron) and induction heating of medium (plasma, plasma betatron) are considered.

Construction of a Simple Transformer to Illustrate Faraday’s Law of Electromagnetic Induction along Side Mutual Inductance

Construction of a Simple Transformer to Illustrate Faraday’s Law of Electromagnetic Induction along Side Mutual Inductance

Electromagnetic Energy Harvester for Low Frequency Vibrations Using MEMS

This paper proposes design and analysis of electromagnetic energy harvester using MEMS technology. The energy harvester is intended to harvest energy from low frequency ambient vibrations that is less than 100Hz. The design would consist of a cantilever which is the simplest MEMS structure which can further be used to power the amplifiers. These amplifiers can be used to amplify the low amplitude and low frequency vibration signals. The work intends to explore the opportunities in harnessing vibrations induced by the live loads, such as laden Lorries & Buses on bridges, to harvest energy in the form of generated voltage. A cantilever based electromagnetic energy harvester can be employed to capture these miniscule level of vibrations and convert them into electrical energy. The Faraday's law of electromagnetic induction is the fundament idea utilized to design the cantilever beam simulated with dimensions of 2500x500μm. The material plays a vital role in sensitivity and hence NdFeB is selected as magnetic material whereas Aluminum as the conducting coil electrode material. The voltage of 2.34mV is generated using single cantilever beam energy harvester. An array of six such cantilevers generates a voltage of 3.27mV. The simulation results confirm that the low ambient vibrations can be effectively utilized to generate useful energy.

Design and Optimization of an Electromagnetic Vibration Energy Harvester Using Dual Halbach Arrays

In this paper, an electromagnetic vibration energy harvester (EVEH) with dual Halbach arrays is presented based on the Faraday's law of electromagnetic induction. A Halbach array is a specific arrangement of permanent magnets which could concentrate the magnetic field on one side while reducing the field to almost zero on the opposite side. This array could increase the magnetic field intensity and improve the electromagnetic coupling. The experimental results show that the output performance of the presented harvester is optimal when the height of the coil equals to the sum thickness of two adjacent magnets in the array. An optimal output power density is 1.39 mW/cm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sup> at a resonant frequency of 11.20 Hz with an acceleration of 0.5 g (with g = 9.8 m/s <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> ) across a 20 mm-high and 1600-turn coil. When other conditions are kept constant, the output power density is proportional to the length of the cantilever. The EVEH based on dual Halbach arrays can increase the output power density and minimize the overall volume, which is beneficial for improving the practical application.

2-P-D-7. Effect of pulsed magnetic stimulation in isometric exercise

Pulsed magnetic stimulation (pMS) effectively stimulates neural, muscular, and other excitable tissues by inducing eddy currents in the body, in accordance with Faraday’s law of electromagnetic induction. This can reduce pain and allow noncontact stimulation of deep tissues, and is therefore used in the examination and diagnosis of cranial neurological disease and in various fields of rehabilitation. We are considering a new application for magnetic stimulation by utilization of its effects on muscle fatigue recovery. Electrical stimulation is generally used in physical therapy to induce electron flow relevant to the electrophysiological, biochemical, and mechanical changes in the body that accompany fatigue, and reportedly promotes recovery from muscle fatigue through various mechanisms. Magnetic stimulation also induces electron flows in the body, through pulsating variation of the internal magnetic fields and eddy currents, and may therefore have similar effects on muscle fatigue recovery.In the present study, we applied electromyogram analysis and muscle-strength measurement to determine the characteristics of low-intensity pMS in terms of effects on muscle fatigue recovery. The results show that low-intensity pMS does indeed promote recovery.

Dynamic hysteretic sensing model of bending-mode Galfenol transducer

A dynamic hysteretic sensing model has been developed to predict the dynamic responses of the magnetic induction, the stress, and the output voltage for a bending-mode Galfenol unimorph transducer subjected simultaneously to acceleration and bias magnetic field. This model is obtained by coupling the hysteretic Armstrong model and the structural dynamic model of the Galfenol unimorph beam. The structural dynamic model of the beam is founded based on the Euler-Bernouli beam theory, the nonlinear constitutive equations, and the Faraday law of electromagnetic induction. Comparisons between the calculated and measured results show the model can describe dynamic nonlinear voltage characteristics of the device, and can predict hysteretic behaviors between the magnetic induction and the stress. Moreover, the model can effectively analyze the effects of the bias magnetic field, the acceleration amplitude, and frequency on the root mean square voltage of the device.

DESARROLLO Y DISEÑO DE UN SISTEMA DE ALIMENTACIÓN ELÉCTRICA PARA LOS EQUIPOS DE VIGILANCIA INTELIGENTE EN REDES INTELIGENTES

To solve the power supply problems of the distributed intelligent monitoring equipment in smart power grids, this paper analyzed the shortcomings of current power supply and studied an energy-obtaining power supply based on electromagnetic induction principle. Firstly, special magnetic materials were utilized to make energy-obtaining module. Power cables and power electric wires were used to pass through the Induction coil, the power of the primary side was inducted to the second side by the law of Faraday electromagnetic induction. Then, energy management module successively rectified and filtrated AC power output from energy-obtaining module and DC/DC was converted into 5V power supply. Lithium battery (LB) was taken as standby power module to solve the dead zone of traditional energy-obtaining power supply, and it was ensuring the reliability of the entire power system. Finally, power management module based on STC15F2K60S single chip could reasonably distribute energy management module and standby module as working order of output power by monitoring battery voltage and output voltage, two modules can cooperate closely, that output voltage and current can supply intelligent monitoring equipment. A large number of experiments indicated that this battery could stably output power of DC5V and 5W within the range of 0~1000A and the power of energy management module and standby module switched smoothly, did not destroy the structure of the primary side of the power system, it cost inexpensively and was easily to install, satisfying the power supply requirements of intelligent monitoring equipment.

Modeling of linear micro electromagnetic energy harvesters with nonuniform magnetic field for sinusoidal vibrations

Different architectures for vibration-based linear electromagnetic energy harvesters (EMEHs) have been developed and reported in the literature for applications in autonomous wireless sensor nodes. In the majority of the linear EMEHs the magnetic field over the coil is nonuniform. This paper presents the modeling and simulation for the electromechanical transduction of linear EMEHs with a nonuniform magnetic field configuration excited by harmonic vibrations. Models are developed based on Faraday's law of electromagnetic induction and the Lorentz force law. For a more accurate prediction of the performance of the EMEHs where the entire coil does not experience the same gradient of the normal component of the magnetic flux density, the analytical solution of the off-center magnetic flux density for a square magnet is used. The simulation results of the developed models show good agreement with the experimental results. Simulations of our previously developed EMEH show an improvement of load voltage and the power when the gap between the magnet and the coil is optimized. Moreover, maximizing the number of turns of the coil for the optimized gap, simulations of the optimized device predict a load voltage amplitude (90.2 mV) almost twice and a load power (40.7 μW) almost four times the experimental results obtained for the current prototype.

THE LAW OF ELECTROMAGNETIC INDUCTION

Mathematical models of the electromagnetic induction law which do not take into account Faraday’s restrictions are not in full accordance with the physical phenomenon and so they are not laws. Their incomplete correspondence with real devices results in such "paradoxes" as unlimited magnetic field of unipolar generators, infinite sizes of inductors for DC and AC machines modeled, and so on.