scholarly journals Wireless Torque and Power Transfer Using Multiple Coils with LCC-S Topology for Implantable Medical Drug Pump

Sensors ◽  
2021 ◽  
Vol 21 (23) ◽  
pp. 8150
Author(s):  
Jaewon Rhee ◽  
Yujun Shin ◽  
Seongho Woo ◽  
Changmin Lee ◽  
Dongwook Kim ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Magnetic Material ◽  
Medical Devices ◽  
Constant Current ◽  
Implantable Medical Devices ◽  
Torque Generation ◽  
Receiving Coil ◽  
The Magnetic Field ◽  
Drug Pump ◽  
Medical Drug

In this paper, we propose a method of wirelessly torque transfer (WTT) and power (WPT) to a drug pump, one of implantable medical devices. By using the magnetic field generated by the WPT system to transfer torque and power to the receiving coil at the same time, applications that previously used power from the battery can be operated without a battery. The proposed method uses a receiving coil with magnetic material as a motor, and can generate torque in a desired direction using the magnetic field from the transmitting coil. The WPT system was analyzed using a topology that generates a constant current for stable torque generation. In addition, a method for detecting the position of the receiving coil without using additional power was proposed. Through simulations and experiments, it was confirmed that WTT and WPT were possible at the same time, and in particular, it was confirmed that WTT was stably possible.

Development and Application of Multi-Modular Roll Magnetic Separator

2012 ◽  
Vol 472-475 ◽  
pp. 912-916
Author(s):  
Ding Guo Huang ◽  
Song Liu ◽  
Hong Guang Jiao ◽  
Fei Yue Wang
Keyword(s):  
Magnetic Field ◽  
Magnetic Material ◽  
Permanent Magnet ◽  
Magnetic Force ◽  
Economic Benefits ◽  
Magnet System ◽  
Magnetic Separator ◽  
Perfect Performance ◽  
One Machine ◽  
The Magnetic Field

This new dry magnetic separator has a special structure. It has many magnetic roll which are staggered like a stairsteps. It can finish the task of separating different minerals with only this one machine. And also it can make the different magnetic material which are in the same mineral separate at the same time. The permanent magnet system is made of large fan-shaped magnet. The magnet pole N and S are staggered and has perfect performance of magnetic separation. And the magnetic force is made full use by going-up dynamic separation. And also it gives an analysis of stress in the magnetic field. It also shows that its separation idex is better, the economic benefits are obvious, and it has broader prospects of popularization and application.

SOME OBSERVATIONS ON ROCK MAGNETISM

Geophysics ◽  
1958 ◽  
Vol 23 (2) ◽  
pp. 285-298 ◽  
Author(s):  
Lynn G. Howell ◽  
Joseph D. Martinez ◽  
E. H. Statham
Keyword(s):  
Magnetic Field ◽  
Magnetic Material ◽  
Magnetic Susceptibility ◽  
Transition Temperature ◽  
Iron Ore ◽  
Rock Magnetism ◽  
Bedding Plane ◽  
Metamorphic Rocks ◽  
The Magnetic Field ◽  
Red Bed

It seems that in general the plane of maximum magnetic susceptibility lies in the bedding plane for sediments and in the plane of foliation for metamorphic rocks; there is, also, a tendency for the remanent vector to lie in the plane of foliation in the latter. In the case of chemical deposits, the question is raised as to whether the hematite crystal growth is controlled by the magnetic field. Since pure hematite crystals are paramagnetic along the ternary axis, the remanent vector lies in the basal plane perpendicular to this axis, which being the plane of ferromagnetism, is also the plane of maximum susceptibility. We have investigated chemically deposited hematite in the Clinton iron ore of Silurian Age. Although the remanent vector lies close to the plane of maximum susceptibility, this plane, unfortunately, is also the bedding plane. Several other hematite‐bearing formations show a direction of magnetization close to the bedding plane. Measurements of magnetization and susceptibility anisotropy of samples cooled below the transition temperature for hematite have been made with no conclusive results other than indications of the presence of hematite in some cases. Samples from the Hazel formation of pre‐Cambrian Age have been investigated. The planes of maximum susceptibility for this slightly metamorphosed red bed dip at various angles, and thus a system of microfractures containing magnetic material is suggested as a possible explanation. Pole locations for the Clinton iron ore and the Hazel are presented.

Conjugate Heat Transfer Analysis of Circular Microtube Under Time Varying Heat Source

2005 ◽  
Author(s):  
Abdullatif A. Gari ◽  
Muhammad M. Rahman
Keyword(s):  
Magnetic Field ◽  
Heat Transfer ◽  
Magnetic Material ◽  
Heat Transfer Coefficient ◽  
Transfer Coefficient ◽  
Transient Heat Conduction ◽  
Heat Transfer Analysis ◽  
Working Fluid ◽  
Heating And Cooling ◽  
The Magnetic Field

When a magnetic field is applied to a magnetic material it releases energy. It has been proven experimentally that this temperature rise could be as high as 20 K when a magnetic field of 10 T is applied. Heat is generated when the magnetic field is applied and cooling is produced when the magnetic field is released. The purpose of this study is to explore transient heat transfer coefficient when a fluid is circulated in the substrate through microchannels. Equations for the conservation of mass, momentum, and energy were solved in the fluid region. In the solid region, the transient heat conduction equation was solved. Gadolinium and water were picked as the magnetic material and working fluid respectively. The results are represented by plotting the variations of heat transfer coefficient and Nusselt number with time at various sections of the tube. The effects of the magnetic field strength, diameter of the microtube in the substrate, and Reynolds number were studied. It was found that the heat transfer coefficient changes with time in a periodic fashion when heating and cooling are generated in the system by repeated introduction and relaxation of the magnetic field. The results of this study will be useful for the development of microtube heat exchangers for a compact magnetic refrigerator.

A New Concept of Multimode Magnetorheological Brake Design

2014 ◽  
Vol 605 ◽  
pp. 271-274 ◽  
Author(s):  
L.H. Hamdan ◽  
Saiful Amri Mazlan ◽  
S. Sarip ◽  
Hairi Zamzuri
Keyword(s):  
Magnetic Field ◽  
Magnetic Material ◽  
Field Strength ◽  
Outer Diameter ◽  
Disc Brake ◽  
Electromagnetic Coil ◽  
Mr Fluids ◽  
Simulation Results ◽  
The Magnetic Field ◽  
Rotational Shear

This paper presents a magnetorheological (MR) brake design by using additional squeeze working mode to an existing conventional rotational shear. The MR brake was designed with consideration given to a new concept of braking mechanism with the help of magnetic simulation. Important parameters such as disc brake dimensions, clearance gap and electromagnetic coil configuration were taken into account when constructed the MR brake. Simulation results showed that the magnetic field strength was at best by having the magnetic coil beside the non-magnetic material, which was located at the end of the outer diameter. Meanwhile, the value of magnetic field was greater than when a small squeeze gap was applied. Eventually, the design will provide an opportunity to study and consequently understand on how the MR fluids react to such operating condition in order to be realized in the MR brake.

Radiative and Electrical Properties of a Center-Post Cathode Magnetron Glow Discharge Device

1988 ◽  
Vol 42 (4) ◽  
pp. 576-583 ◽  
Author(s):  
Suzanne Tanguay ◽  
Richard Sacks
Keyword(s):  
Magnetic Field ◽  
Electrical Properties ◽  
Glow Discharge ◽  
Field Strength ◽  
Constant Current ◽  
Glow Discharge Plasma ◽  
Basic Operation ◽  
Current Voltage ◽  
Current Voltage Characteristics ◽  
The Magnetic Field

Current-voltage characteristics and spatially resolved atomic emission data are used to describe the basic operation of a magnetron glow discharge plasma device. The low-pressure glow discharge lamp uses a center-post cathode and a concentric ring-shaped anode. A coaxial magnetic field of a few hundred Gauss is used to achieve magnetron operation where plasma electrons are trapped in closed paths which are concentric with the electrode structure. This results in dramatic changes in the radiative and electrical properties of the device. With constant current, lamp operating voltage may be reduced by more than a factor of two when the magnetic field is present. The effects of filler gas pressure and magnetic field strength on the current-voltage characteristics are presented. The presence of the magnetic field results in a radial contraction of the plasma. This contraction increases with increasing field strength and with decreasing pressure. Ion lines from the Ar filler gas are more affected by the field than are neutral-atom lines from the cathode material.

A Magneto-Hydrodynamic Micro Fluidic Network

2002 ◽  
Author(s):  
Haim H. Bau ◽  
Jianzhong Zhu ◽  
Shizhi Qian ◽  
Yu Xiang
Keyword(s):  
Magnetic Field ◽  
Magnetic Material ◽  
Uniform Magnetic Field ◽  
Building Blocks ◽  
Chaotic Advection ◽  
Electrode Pair ◽  
Electric Circuits ◽  
And Control ◽  
The Magnetic Field ◽  
External Uniform Magnetic Field

The magneto hydrodynamic fluidic network’s basic building blocks are conduits equipped with two electrodes positioned on opposing walls. The entire device is either subjected to an external uniform magnetic field or fabricated within a magnetic material. When a prescribed potential difference is applied across each electrode pair, it induces current in the liquid (assumed to be a weakly conductive). The current interacts with the magnetic field to produce a Lorentz force that is perpendicular to both the directions of the current and the magnetic field. Analogously with electric circuits, by judicious application of the potential differences at various branches, one can direct liquid flow in any desired way and rate without a need for mechanical pumps or valves. By equipping the network branches with additional, interior electrodes, the branches double as stirrers capable of generating chaotic advection. The paper describes the basic building blocks for such a network, the operation of these branches as stirrers, a general theory for the analysis and control of fluidic magneto-hydrodynamic networks, and an example of a network fabricated with low temperature, co-fired ceramic tapes.

scholarly journals Magnetoreception in Social Wasps: An Update

2016 ◽  
Vol 9 (1) ◽  
pp. 01-05 ◽  
Author(s):  
Maria da Graça Cardoso Pereira-Bomfim ◽  
William Fernando Antonialli-Junior ◽  
Daniel Acosta-Avalos
Keyword(s):  
Magnetic Field ◽  
Magnetic Material ◽  
Conceptual Framework ◽  
Social Insects ◽  
Geomagnetic Field ◽  
Social Wasps ◽  
The Social ◽  
Local Intensity ◽  
Future Work ◽  
The Magnetic Field

Abstract. Magnetoreception is a mechanism of active orientation that occurs in animals with nervous systems. Social insects such as bees, ants, wasps and termites have been studied on the influence of the magnetic field exerts on its biology. The social wasps comprise species represented in Stenogastrinae, Vespinae and Polistinae, however studies on the influence of magnetic field on wasps Vespinae address only. The areas studied include the biomineralization of magnetic material and behavioral aspects related to changes in local intensity of the geomagnetic field. The objective of this review is to integrate knowledge of social wasps’ magnetoreception in order to build an instructive overview of the current situation of studies, therefore, provide the conceptual framework for the development of future work on the topic.Magnetorrecepção em Vespas Sociais: Uma AtualizaçãoResumo. Magnetorrecepção é um mecanismo de orientação ativa que ocorre em animais com sistema nervoso. Insetos sociais tais como abelhas, formigas, vespas e cupins são estudados sobre a influência que o campo magnético exerce em sua biologia. As vespas sociais compreendem espécies representadas em Stenogastrinae, Vespinae e Polistinae, no entanto os estudos sobre a influência do campo magnético em vespas abordam somente Vespinae. As áreas de estudo incluem a biomineralização do material magnético e aspectos comportamentais relacionados a mudanças na intensidade do campo geomagnético local. O objetivo desta revisão é integrar o conhecimento sobre magnetorrecepção em vespas sociais, a fim de construir um panorama elucidativo da atual situação dos estudos, e assim fornecer uma estrutura conceitual para o desenvolvimento de trabalhos futuros sobre o tema.

Anisotropic Magnetic Fibers Produced via a Magnetic Drawing Process

MRS Advances ◽  
2017 ◽  
Vol 2 (16) ◽  
pp. 921-926
Author(s):  
Corey Breznak ◽  
Paris von Lockette
Keyword(s):  
Magnetic Field ◽  
Magnetic Material ◽  
Barium Hexaferrite ◽  
Magnetic Domains ◽  
Squareness Ratio ◽  
High Anisotropy ◽  
Field Lines ◽  
Von Mises ◽  
Oriented Parallel ◽  
The Magnetic Field

ABSTRACTThis work aims to develop magnetic fibers whose magnetic properties improve upon fibers produced using existing techniques. The goal of this work is to develop magnetic fibers that are magnetically anisotropic, with high squareness ratios when the fibers are oriented parallel to the applied magnetic field, and lower square ratios when the fibers are oriented perpendicular to the field. In this work, barium hexaferrite particles were embedded in a Sylgard elastomer matrix. The magnetic material was placed on a sheet of acrylic with spacers on opposite ends. A top sheet of acrylic was placed on the spacers. A 0.5 T permanent magnet was placed on top of the upper piece of acrylic. Magnetic fibers were drawn as the material aligned itself with the magnetic field lines of the magnet. After the fibers cured they were tested on a vibrating sample magnetometer at angles parallel and perpendicular to the field. The results showed that the fibers were highly anisotropic, with an average squareness ratio of 0.82 in the easy axis and an average squareness ratio of 0.34 in the hard axis. Although, the fibers were anisotropic, there was a high variability in the magnetization when normalized by the total volume of the fiber. This indicates that the magnetic content varies within each fiber, likely due to the variation in the strength of the magnetic field lines of the external magnet. This research demonstrated that magnetic fibers with high anisotropy can be fabricated, but the amount of magnetic material in each fiber from the same batch needs to be tuned to decrease variability. Fitting this experimentally found squareness ratio to a von Mises distribution, the concentration parameter was calculated to be 0.14. This indicates the magnetic domains within each fiber are highly aligned with the externally applied field.

scholarly journals In-Plane Sensitive Magnetoresistors as a Hall Device

Proceedings ◽  
2018 ◽  
Vol 2 (13) ◽  
pp. 710
Author(s):  
Siya Lozanova ◽  
Ivan Kolev ◽  
Avgust Ivanov ◽  
Chavdar Roumenin
Keyword(s):  
Magnetic Field ◽  
High Performance ◽  
Ohmic Contacts ◽  
Signal To Noise Ratio ◽  
Current Mode ◽  
Constant Current ◽  
Field Polarity ◽  
Practical Applications ◽  
High Measurement ◽  
The Magnetic Field

A novel coupling of a pair of identical two-contact (2C) magnetoresistors transformed into an in-plane sensitive Hall device is presented. The ohmic contacts are cross-linked, also adding a load resistor bridge, providing for constant current mode of operation and eliminating the inevitable parasitic offset. This silicon configuration, apart from its simplified layout, has linear and odd output voltage as a function of the magnetic field and current. The quadratic and even magnetoresistance in the two parts of this innovative device is completely compensated, which ensures high measurement accuracy alongside with identification of the magnetic field polarity. The experimental prototypes feature sensitivity of 110 V/AT. The mean lowest detected magnetic induction B at supply current of 3 mA over frequency range f ≤ 100 Hz at a signal-to-noise ratio equal to unity is Bmin ≈ 10 μT. Тhe high performance and the complete electrical, temperature and technological matching of the parts of this unusual Hall device make it very promising for many practical applications.

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