Electromagnetic Force Field Research Articles

Analyzing the dynamics of a charged rotating rigid body under constant torques

This study explores the dynamical rotary motion of a charged axisymmetric spinning rigid body (RB) under the effect of a gyrostatic moment (GM). The influence of transverse and invariable body fixed torques (IBFTs), and an electromagnetic force field, is also considered. Euler’s equations of motion (EOM) are utilized to derive the regulating system of motion for the problem in a suitable formulation. Due to the lack of torque exerted along the spin axis and the nearly symmetrical nature of the RB, the spin rate is nearly unchanged. Assuming slight angular deviations of the spin axis relative to a fixed direction in space, it is possible to derive approximate analytical solutions (AS) in closed form for the attitude, translational, and rotational movements. These concise solutions that are expressed in complex form are highly effective in analyzing the maneuvers performed by spinning RBs. The study focuses on deriving the AS for various variables including angular velocities, Euler’s angles, angular momentum, transverse displacements, transverse velocities, axial displacement, and axial velocity. The graphical simulation of the subsequently obtained solutions is presented to show their precision. Furthermore, the positive impacts that alterations in the body’s parameters have on the motion’s behavior are presented graphically. The corresponding phase plane curves, highlighting the influence of different values in relation to the electromagnetic force field, the GM, and the IBFTs are drawn to analyze the stability of the body’s motion. This study has a significant role in various scientific and engineering disciplines. Its importance lies in its ability to optimize mechanical systems, explain celestial motion, and enhance spacecraft performance.

Magnetic focusing sensor and its characterizations of defect non-destructive testing for ferromagnetic steel plate

The fast development in precision manufacturing and product quality inspection of ferromagnetic material desperately demands that the defect determining the performance, service life and reliability of the mechanical part should be accurately sensed, detected and evaluated. However, conventional defect detection methods and related magnetic induction sensors are usually characterized with low accuracy in small defect detection, which makes the non-destructive testing (NDT) for ferromagnetic material full of challenges. Thus, a new magnetic focusing sensor is proposed and designed for the precision defect detection of ferromagnetic steel plate here. First, the theoretical principle analysis of the magnetic focusing sensor is introduced, and the preliminary finite element modeling (FEM) is conducted to demonstrate the feasibility of the magnetic focusing sensor in tiny defect inspection. Then, both the static and coupling dynamic characterizations of the magnetic focusing sensor are investigated using the FEM method. The optimal structural parameters of the magnetic focusing (MF) sensor in static conditions are summarized. Furthermore, the effects of the dynamic movement of the MF sensor on the multi-physical fields of the magnetization field, electric field, electromagnetic attraction force field and thermal field are all revealed. Finally, experiments regarding the performance evaluation and comparison between the MF sensor and other two magnetic flux leakage (MFL) sensors are conducted, and the prominent capabilities of accurate and precise defect detection for the MF sensor is demonstrated through the defect detection with different sizes. The effectiveness and feasibility of the MF sensor in detecting tiny defects on ferromagnetic object, as well as its great potential for practical application is therefore validated. Additionally, the main conclusions, advantages of the MF sensor are summarized and the future work is discussed.

Design and harmonic analysis of single winding bearingless PM synchronous motor with high winding coefficient

Compared with double-winding bearingless permanent magnet synchronous motor, single-winding bearingless permanent magnet synchronous motor (SBPMSM) has the advantages of low copper loss and low failure rate. However, if the slot-pole combination of SBPMSM is not reasonably selected, the winding coefficient will be reduced, and even many advantages of the single-winding structure will be offset. In this paper, a single-winding design method based on magnetomotive force (MMF) star diagram is proposed, which can ensure high winding coefficient. The design process of the proposed single winding structure is introduced. This method can match the appropriate number of stator slots according to the number of rotor poles, and the winding phase separation design can be realized by reversing the slot number transposition. The mathematical models of the suspension force and torque of the bearingless permanent magnet synchronous motor are derived considering the magnetic field harmonics, and the 6-slot/2-pole SBPMSM and 18-slot/8-pole SBPMSM are taken as examples to analyze the magnetic field. The finite element simulation models of 6-slot/2-pole SBPMSM and 18-slot/8-pole SBPMSM are built and analyzed. Through the analysis of electromagnetic torque, suspension force and air-gap magnetic field under different magnetic fields, the general rules of main torque fluctuation and suspension force fluctuation are summarized.

Analysis and Design of the High Current Rising Rate Hybrid DC Current Limiting Circuit Breaker

To solve the problem of the high rising rate and large peak value of the expected current of the short-circuit current in marine DC power system faults, a hybrid DC current limiting circuit breaker scheme based on a high-speed electromagnetic repulsion mechanism is proposed. A parameter selection model is constructed by comprehensively considering the short-time withstand of the thyristor, the volume of the commutation circuit, and capacitor energy, and the optimal value of the commutation circuit parameters at a certain voltage level is obtained. The finite element mathematical model of the high-speed electromagnetic repulsion mechanism is established by coupling the electromagnetic force field, which enables the deformation process of the mechanism under the condition of high acceleration to be considered. The von Mises yield criterion is adopted as the mechanical boundary condition in the design of a high-speed electromagnetic repulsion mechanism, which solves the problem of the long inherent time of opening. The experiment platform is built, and the experiment under the fault condition with a current rising rate of 20 A/μs is completed. The arcing time, commutation time, zero-voltage recovery time, and contact movement characteristics are obtained, which meet the design requirements, verify the effectiveness of the analysis, and lay a solid foundation for further research and development of the current limiting circuit breakers for medium voltage DC systems.

The Transient Evolution of Flow Due to the Excitation Pulse in Oscillating Drop Experiments in Microgravity Electromagnetic Levitation

In oscillating drop experiments, surface oscillations in a molten sample are captured and analyzed to determine the surface tension and viscosity of a melt without the need to contact the liquid sample. In electromagnetic levitation, surface oscillations are initiated using an excitation pulse in the electromagnetic field. The variation in the electromagnetic force field drives rapid acceleration in the melt while also changing the flow pattern. During the quasi-static flow conditions prior to the excitation pulse, the flow displays a “positioner-dominated” flow pattern with 4 recirculation loops in the sample hemisphere. However, the accelerating flow of the excitation pulse transitions into a “heater-dominated flow” pattern in which there are only 2 recirculation loops in the sample hemisphere. Following the excitation pulse, the flow rapidly slows and quickly returns to the conditions present before the excitation pulse. For many combinations of parameters, the transition in the flow pattern results in a very complicated variation in velocity with time; that variation is the topic of this paper.

Effect of wide-spectrum pulsed magnetic field on grain refinement of pure aluminium

A wide-spectrum pulsed magnetic field (WSPMF) was obtained by adjusting the number of current pulses and the pulse interval between adjacent pulses. The effect of WSPMF on the grain refinement of pure aluminium was studied. The distribution of electromagnetic force and flow field in the melt under the WSPMF was simulated to reveal the grain refining mechanism. Results show that the grain refinement is attributed to the combined effect of the melt flow and oscillation under a WSPMF. When the pulse interval is 5 ms, the extreme value of electromagnetic force is the highest, and the size of the crystal nucleus is 0.35 mm. In the case of similar flow rates, the grain size gradually decreases as the pulse interval increases. The range of the harmonic frequency of the magnetic field gradually expands with the increase of the pulse interval, which can provide more energy for nucleation at the solid-liquid interface and promote nucleation.

Optimization Design of Magnetic Isolation Ring Position in AC Solenoid Valves for Dynamic Response Performances.

Dynamic response characteristics of solenoid valves directly determined their performances. Among numerous parameters, the influence of magnetic isolation ring (MIR) on solenoid valve performance is crucial. Previous optimization studies have not conducted a systematic exploration and analysis of MIR. In this paper, a model of an AC solenoid valve considering the position of the MIR is proposed, and the model’s accuracy was verified by simulation and experiments. The electromagnetic force, response time, and magnetic field distribution at different positions of the MIR were analyzed, and the effect of the position of MIR on dynamic response characteristics of the solenoid valve was clarified. The results show that the MIR affects the dynamic response characteristics of the solenoid valve by changing the magnetic circuit. With the positive translation of the position of the MIR along the Z-axis, the electromagnetic force first increases and then decreases, and the response time first decreases and then increases. The position range of MIR with excellent dynamic response performance was obtained from the comprehensive consideration of response time and electromagnetic force. Finally, the optimization design for the dynamic response performance of the solenoid valves is realized.

Structure Formation of Bio-Elements

We study a Nano-Structural 4-forces of New Atomic Model, a lithography of biological elements on the basis of Super Unified Theorem SU(11)⊃SU(6)×SU(5)×U(1) or SU(11)⊃SU(6)×SU(3)×SU(2)×U(1). The existences of up-converting quantum masses or positions or dots of colloidal lithographies from exotic matter fluid to ordinary matter through colloidal stages, have been consider as four coordinates, such as x = ω1t; y = ω2t; z = ω3t; within the three dimensional real time ‘t’ and ω4t, a pseudo co-ordinate appearing by optical holography beams of photon-like[neutrino-likes created from the new energy sources of SU(6), SU(12), SU(24),....etc. interacting with photons creating by the group of U(1) through the respective framework of SU(6)×U(1), SU(12)×U(1),……etc. appears photon-likes quanta with ordinary photon of non-monotonic fluxes of flows (such like as laser pulses), appearing it, as incoming information through light rays with different gradient forces of multiple foci, behaving then as like different laser designated beams of holographic optical tweezers(HOT), then optimizing or controlling its potentiality for trapping multiple nano-particles fabricates colloidal lithography] fluxes of rays by new energies, an aperture or nano-hole based creation within a closed space or closed universe (an area filled with known & unknown energies, may increasing like a balloon, unfolding up-to a certain range then contraction), where ω1, ω2, ω3, ω4 are assumed to be the angular momentums. Assuming, in this model formed a General Atomic Structure where any formations was influences by exotic matter fluids through the creation of strong forces by the new energy sources of SU(6) in the framework of SU(6)×U(1) using with GUT symmetry breaking. We then find different status formation of ordinary matter atoms by the hidden interactions forces of new energies between different framework of sub-groups (as explained before) with U(1), the electrodynamics created magnetic monopole (once created does not destroyed) found it is highly polarizable particles. Thus, there created an electromagnetic force fields with appearances of “Charges” by quarks through the model of SU(5)⊃ SU(3) × SU(2) × U(1). In this new SUT model, we study the formations of some kind of new quantum particles-like in wave status created through colloidal stages firstly before GUT model by the exotic matter fluid maintaining the entanglement of wave-wave duality. The stiffness’s of different nano-particles within colloidal environment was appeared frequently by different resonance vibration mode through new light energy waves of high intensities of short wave lengths but strong strength forces created by SU(6) after the symmetry breaking of SU(11)⊃ SU(6) × SU(3) × SU(2) × U(1). According to the GUT theory, it is the low potential stage however it is high potential with respect to SUT[remembering the enthalpy of vaporization, it is like the measure of latent heat (540Cal/g) is traded or discharged in the stage move during the build-up of 1g water fume to 1g water with same temperature 100˚C]. In the theory of SU(11), new particle-likes in wave status are formed tightly bindings by the bosons of SU(6) with different quark-types but lepton-likes. These new kind of particle-like in wave characters (considering as primary nascent fundamental matter particles) are assumed to be the causes for wave-particle duality of quantum entanglement or the uncertainty principle of ordinary matter particles. These new kinds of particle-likes are then hidden in the background of all known ordinary particle interactions, may observe only by laboratory experiments. Although, ordinary matter particles are find when bosons of SU(6) changes to the bosons of SU(5) [i.e. SU(3)×SU(2)×U(1)] by exchanging the bosons of SU(11). The observing matter particles in GUT model, forming by gluons & different quarks fabricating and accelerating the ordinary quantum structures, which are therefore actually formed by up-converting quantum masses through resonance vibrations with proper interactions of background hidden forces between trapping particles with all others non-trapping nano-particles. We find then require different mobilise or immobilise elements structures, such as DNA or Protein bio-molecules, monomers, polymers etc. We thus need a Revision of Standard Model of Physics on the basis of Super Unified Theory of SU(11)⊃ SU(6) × SU(3) × SU(2) × U(1), where we positively accounting the 4th forces as gravitational force created by SU(6).

One dimensional analytical model considering end effects for analysis of electromagnetic pressure characteristics of annular linear induction electromagnetic pump

A one-dimensional analytical model with the finite magnetic core length and conductive duct wall thickness of annular linear induction electromagnetic pump (ALIP) is established in this paper. Based on this model considering both the end effects and the conductive duct wall effect, the explicit analytical expressions of the electromagnetic and force fields are deduced. At the same time, the influence of end effects and the conductive duct wall effect on electromagnetic field and force field is analyzed and the components of magnetic field, induced eddy current and force field which are produced because of the existence of end effects are separated. Then, the explicit analytical expression of the developed pressure is obtained with the introduced fluid loss. Finally, to verify the feasibility and accuracy of the analytical model, the performance of a small three-phase ALIP under different frequency and current conditions are calculated analytically and the calculated results are verified by experiments data from the experimental test loop.

Significance of Hall currents on hybrid nano-blood flow through an inclined artery having mild stenosis: Homotopy perturbation approach

The rheological perspective of blood flow with the suspension of metallic or non-metallic nanoparticles through arteries having cardiovascular diseases is getting more attention due to momentous applications in obstructed hemodynamics, nano-hemodynamics, nano-pharmacology, blood purification system, treatment of hemodynamic ailments, etc. Motivated by the novel significance and research in this direction, a mathematical hemodynamics model is developed to mimic the hemodynamic features of blood flow under the concentration of hybrid nanoparticles through an inclined artery with mild stenosis in the existence of dominating electromagnetic field force, Hall currents, heat source, and porous substance. Copper (Cu) and copper oxide (CuO) nanoparticles are submerged into the blood to form hybrid nano-blood suspension (Cu-CuO/blood). The attribute of the medium porosity on the blood flow is featured by Darcy's law. The mathematical equations describing the flow are formulated and simplified under mild stenosis and small Reynolds number assumptions. To determine the analytical solution of the resulting nonlinear momentum equation, the homotopy perturbation method (HPM) is employed. Several figures are graphed to assess the hemodynamical contributions of various intricate physical parameters on blood flow phenomena through the inclined stenosed artery. Significant outcomes from graphical elucidation envisage that the hemodynamic resistance to the blood flow is reduced due to the dispersion of more hybrid nanoparticles in the blood. The hemodynamic resistance (impedance) increases approximately two times by dispersing 0.11% hybrid nanoparticles in the blood flow. The temperature of Cu-CuO/blood is found to be lower in comparison to Cu-blood and pure blood. Intensification of Hall parameter attenuates the wall shear stress at the arterial wall. The trapping phenomena are also outlined via streamline plots which exemplify the blood flow pattern in the stenosed artery under the variation of the emerging parameters. As anticipated, the addition of a large number of hybrid nanoparticles significantly modulates the blood flow pattern in the stenotic region. The novel feature of this model is the impressive impact of Hall currents on hybrid nanoparticle doped blood flow through the stenosed artery. There is another piece of significance is that HPM is the most suitable method to handle the nonlinear momentum equation under the aforementioned flow constraints. Outcomes of this simulation may be valuable for advanced study and research in biomedical engineering, bio-nanofluid mechanics, nano-pharmacodynamics.

The Influence of Torsion Field on Mouse Kidney Cells In-vitro

The bioelectromagnetics community has repeatedly demonstrated that Electromagnetic (EM) force fields affect...

Simulation of Gas-Dynamic and Thermal Processes of Reduction of Molybdenum Fluoride and Synthesis of Its Carbide in Inductively Coupled Radiofrequency Plasma

A method has been proposed for simulating the gas-dynamic conditions for the synthesis of molybdenum and its carbides in a radiofrequency induction plasma reactor with a vortex gas supply. A homogeneous flow of a mixture in a turbulent mode has been considered, taking into account inductive heating and the influence of the electromagnetic field force on the plasma motion. The composition of the transformation products has been determined in accordance with the results of thermodynamic calculations. The effect of the main synthesis products on the temperature field and flow in the reactor has been taken into account. The possibility of using a thermal, quasi-equilibrium argon–hydrogen plasma for the production of molybdenum and its carbides Mo2C and Mo3C2 from volatile fluoride and, as a reference, tungsten and its carbide WC has been explored. These results have been compared with those obtained earlier for boron, silicon, and their carbides.

Research status and future perspectives on ultrasonic arc welding technique

In recent years, ultrasonic arc welding technology, a novel and promising welding process, has been widely applied in the welding of steel, aluminum alloy, titanium alloy, nickel base alloy and composite materials to improve the welding efficiency and quality of the welded joints. This paper reviews the research status of ultrasonic arc welding technology, systematically classifies and summarizes the process of ultrasonic arc welding in terms of different ultrasonic energy forms, and evaluates the limitations of the processes. Based on the experiment and simulation results, this paper summarizes the effect mechanisms of ultrasonic on the arc characteristics and molten pool behaviors during arc welding, namely the theories of ultrasonic vibration and electromagnetic field, and briefly discusses the association mechanism of ultrasonic vibration and electromagnetic field. Finally, we summary the systematic results supporting the association mechanism. On the one hand, ultrasonic energy leads to arc compression, which can effectively improve the arc stiffness, arc pressure and energy density, thus improving the arc thermal efficiency and welding efficiency. On the other hand, the ultrasonic stirring and mixing effects as well as the high-frequency pulsed electromagnetic field force introduced by the ultrasonic energy accelerate the thermal convection circulation and the flow of the molten pool, and affect the solidification and crystallization behavior of the molten pool, thus improving the formation, microstructure and mechanical properties of the weld. The paper aims to comprehensively review the ultrasonic arc welding process and mechanisms, and provide guidance for the future research and development in ultrasonic arc welding technique.

Influence of the low voltage pulsed magnetic field on the columnar-to-equiaxed transition during directional solidification of superalloy K4169

The low voltage pulsed magnetic field (LVPMF) disrupts the columnar dendrite growth, and the columnar-to-equiaxed transition (CET) occurs during the directional solidification of superalloy K4169. Within the pulse voltage ranging from 100 V to 200 V, a transition from columnar to equiaxed grain was observed, and the grain size decreased as the pulse voltage rised. As the pulse frequency increased, the CET occurred, and the grains were refined. However, the grains became coarse, and the solidification structure was columnar crystal again when frequency increased to 10 Hz. The LVPMF had an optimal frequency to promote CET. The LVPMF on the CET was affected by the withdrawal speed and increasing the withdrawal speed enhances the CET. The distribution of electromagnetic force and flow field in the melt under the LVPMF were modeled and simulated to reveal the CET mechanism. It is considered that the CET should be attributed to the coupling effects of magnetic vibration and melt convection induced by the LVPMF.

Optimization of Braking Force for Electromagnetic Track Brake Using Uniform Design

Electromagnetic track brake is increasingly applied to improve emergency braking force together with the main wheel-rail brake system, while larger electromagnetic braking force is demanded. The bottom of pole shoe is designed as the same curved surface like track top in order to achieve a good contact between pole shoe and track and the pole shoe chamfering is also designed to improve electromagnetic attractive force. Three main variables that decide the electromagnetic attractive force are selected in the paper: pole shoe contact width, protection block length and pole shoe length. The reliability of electromagnetic simulation is verified through prototype test and then the electromagnetic attractive force in this study is achieved by electromagnetic simulation. First, the effects of the three variables on electromagnetic attractive force are investigated singly. Then, a uniform design method is employed in this study to further optimize electromagnetic attractive force by researching the interactional effects of the three variables. A regression model is established with pole shoe contact width, protection block length and pole shoe length as the independent variables, and electromagnetic attractive force as the dependent variable. Depending on the regression model, the optimum conditions of the three variables are achieved. In addition, finite element simulation of electromagnetic track brake is developed to investigate electromagnetic attractive force and magnetic field distribution by Ansoft Maxwell. Compared to the existing electromagnetic track brake, the electromagnetic braking force and electromagnetic braking deceleration of the optimized electromagnetic track brake are improved by 6.3% under the optimum conditions, which can greatly improve train safety in emergency. The proposed reinforcement optimizations have two outstanding characteristics. The first is keeping the space usage of electromagnetic track brake unaltered, and the other is its simplicity to conduct.

Comparison between ionospheric disturbances caused by barium and cesium

After being released in the ionosphere, alkali-metal atoms will be rapidly photoionized by solar UV, producing positive ions and electrons, and forming artificial plasma cloud. Based on a three-dimensional two-species fluid model, considering both the loss of barium atoms due to photoionization and oxidation and the influence of horizontal wind field in the release region, the spatial-temporal evolution of the artificial plasma cloud is discussed. By taking into account the electromagnetic field force, pressure gradient, particle collisions and ion inertia, the ionospheric disturbance effects caused by barium and cesium are compared with each other. The simulation results show that the alkali metal rapidly expands after being released in the ionosphere, and the generated plasma cloud gradually forms an ellipsoidal structure from the inside to the outside under the constraint of magnetic field with considering no wind. Meanwhile, the expanded plasma cloud pushes away the background oxygen ions, forming an oxygen ion density hole in the release center and two symmetrical density bumps on both sides. In the absence of neutral wind, the plasma cloud is dominated by the movement along magnetic field, while considering the background neutral wind, the plasma cloud and background disturbance area will move along the direction of wind, so that the density gradient of plasma cloud becomes steepening on the upwind side. Although the movement of ion cloud across the magnetic field is constrained, the neutrals can pass through the magnetic field freely, so the ion cloud and neutral cloud will separate from each other slowly. Also, the presence of horizontal wind field will make a greater disturbance to the background oxygen ion. By comparing the simulation results of barium and cesium we can see that, qualitatively, the expansion characteristics of Cs<sup>+</sup> and Ba<sup>+</sup> as well as their effects on the background O<sup>+</sup> are similar. Due to the small diffusion coefficient of cesium, the barium cloud expands more rapidly and the coverage area of Ba<sup>+</sup> cloud is wider. Because of the large photoionization rate of cesium, the ionization yield of cesium is higher than that of barium when the same mass is released. In addition, the snowplow effect of Cs<sup>+</sup> is stronger than that of Ba<sup>+</sup>, and the oxygen ion density holes and bumps caused by Cs<sup>+</sup> are also larger.

Passive Shield Structure to Reduce Acoustic Noise Around Magnetic Resonance Imaging Device and Prevent Deterioration of Images

A spatial arrangement of passive shield copper rings which prevents the deterioration of tomographic image was proposed to reduce acoustic noise around magnetic resonance imaging (MRI) devices. Tests for the copper rings, the conventional copper shield, and the non-shielded structures were conducted to compare the sound level in four kinds of pulse sequences and image quality in the fast spin echo (FSE) pulse sequence with a clinical 1.5 T MRI system. Numerical analyses revealed the influences of the electromagnetic force and unnecessary magnetic field caused by the eddy current. For the copper ring structures, the sound level outside the magnet decreased 5 dB(A) from that of the non-shielded structure. The percentages of image deterioration number in the FSE pulse sequence for the conventional and the copper ring structures were increased 15% and decreased 4%, respectively. Numerical results showed that the electromagnetic force of the MRI devices decreased 60% and the unnecessary magnetic field at the imaging space decreased 30%, supporting the test results. The position of the eddy current was the most important factor for each contribution. The proposed copper ring structure is able to reduce acoustic noise outside the magnet and prevent image deterioration.

Heat Transfer Analysis of a Magneto-Bio-Fluid Transport with Variable Thermal Viscosity Through a Vertical Ciliated Channel

We communicate the responses of various physiological fluids containing hemoglobin and other ionic constituents when they propagate in the presence of an electromagnetic body force field with the mechanisms of heat generation and conduction. A fully developed mixed convective flow of a Newtonian fluid takes place through a 2D vertical channel in the presence of an external magnetic field acting in the direction normal to the flow. The inner surface of the channel is carpeted with a thick mat of cilia, which propagates a sinusoidal metachronal wave travelling in the direction of flow. Coupled, nonlinear governing Naiver-Stokes and temperature equations are simplified by utilizing the creeping flow and long wavelength approximations. This enables us to formulate the exact analytical solution of the temperature distribution; whereas, the velocity distribution is evaluated from the momentum equations by using the Adomian decomposition method. In order to determine the pumping characteristics, the formulae of volume flow rate and the pressure rise are also obtained. Trapping due to the ciliary system is highlighted by graphing the stream function. The findings of the present model have significant outputs, which can be applicable in the physiological transport of human semen through the male reproduction system.

Evaluation of Electric and Magnetic Fields Distribution and SAR with the Help of Intensity of Time Averaged Electromagnetic Wave

Potential Risk From Exposure to EMF have been explored for a long time .Different research endeavours have tended to security rules to Protect the Human body from EM penetration. The study of Electromagnetic fields and non-ionizing effects on human body is a very useful due to possible health effects that these many electromagnetic field can cause in humans. At the point when an Electric or Magnetic field Penetrates into body ,it is weakened and some portion of is assimilated inside the body tissue. Impact of EM on Human body relies upon force of Electromagnetic field and distance of EM source to human body.Specific Absorption Rate (SAR) is a parameter used to estimate amount of energy absorbed by a human body.SAR Is depends on Frequency and Intensity of Electromagnetic wave. Broad Research is already done on Reduction of SAR in the case over usage of Mobile phones units but SAR minimization in Medical Application like MRI is always a challenge to Researchers. The advantages of Magnetic Resonance imaging (MRI) have made it the Radiological Method of Choice for an extraordinary Number of analytic Procedures,but the drawback is options are limited in the case of patients who are having implantable devices,The SAR Value is increased due to implantable devices because of temperature Rise. Leakage Magnetic field from the diagnosis instruments leads to hazardous to medical Personnel. this Paper is a initiated work on Study of SAR considering the intensity of electromagnetic wave and assessment of SAR in case of leakage of Magnetic field leakage.

Multiphysics Global Design and Experiment of the Electric Machine With a Flexible Rotor Supported by Active Magnetic Bearing

Electric machine with a flexible rotor has unique advantages and extensive applications in industry, but it has been studied in the theoretical and experimental stage for decades because of its multidisciplinary feature, difficulty of realization, and lacking suitable design method. In this paper, a multiphysics global design method was proposed, and an electric machine with a flexible rotor supported by active magnetic bearing was developed based on this method to resolve a series of actual engineering problems for future industrial air blower application. The design process involves electromagnetic field, force field, flow field, and temperature field. The validity of the industrial prototype system was verified by the relevant experiments, and the proposed design method can be used for the development of the similar complex machine with the characteristics of multidisciplines or multiphysics.