Magnetic flux concentration and magnetic force enhancement using YBCO cylinders

A magneto-mechano-electric (MME) generator comprising a magnetoelectric (ME) composite and magnetic flux concentrator (MFC) can effectively harvest the tiny magnetic noise to power the autonomous internet of things (IoT) sensor networks.

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NEW ELECTROMAGNETIC PUMP BASED ON THE EFFECT OF MAGNETIC FLUX CONCENTRATION

COMPEL The International Journal for Computation and Mathematics in Electrical and Electronic Engineering ◽

10.1108/eb051774 ◽

1992 ◽

Vol 11 (1) ◽

pp. 149-152 ◽

Cited By ~ 1

Author(s):

K. Bessho ◽

A. Krawczyk ◽

K. Nakamoto

Keyword(s):

Magnetic Flux ◽

Electromagnetic Pump ◽

Flux Concentration

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An ac/dc magnetometer for space missions: Improvement of a Hall sensor by the magnetic flux concentration of the magnetic core of a searchcoil

Sensors and Actuators A Physical ◽

10.1016/j.sna.2007.08.030 ◽

2008 ◽

Vol 142 (2) ◽

pp. 503-510 ◽

Cited By ~ 11

Author(s):

P. Leroy ◽

C. Coillot ◽

V. Mosser ◽

A. Roux ◽

G. Chanteur

Keyword(s):

Magnetic Flux ◽

Space Missions ◽

Magnetic Core ◽

Hall Sensor ◽

Flux Concentration

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Nonlinear Vibration in a Vertical Rigid Rotor Supported by the Magnetic Bearing: Case Considering the Delays of Both Electric Current and Magnetic Flux

Volume 1: 21st Biennial Conference on Mechanical Vibration and Noise, Parts A, B, and C ◽

10.1115/detc2007-34637 ◽

2007 ◽

Author(s):

Tsuyoshi Inoue ◽

Motoki Sugiyama ◽

Yasuhiko Sugawara ◽

Yukio Ishida

Keyword(s):

Magnetic Flux ◽

Electric Current ◽

Magnetic Force ◽

Magnetic Bearing ◽

Active Magnetic Bearing ◽

Nonlinear Phenomena ◽

Control Force ◽

Rigid Rotor ◽

Rotating Speed ◽

First Order

Active magnetic bearing (AMB) becomes to be widely used in various kinds of rotating machinery. However, as the magnetic force is nonlinear, nonlinear phenomena may occur when the rotating speed becomes higher and delay of control force increases. In this paper, the magnetic force is modeled by considering both the second order delay of the electric current and the first order delay of the magnetic flux, and the AMB force is represented by a power series function of the electric current and shaft displacement. The nonlinear theoretical analysis of the vertical rigid rotor supported by AMB is demonstrated. The effects of the delays and other AMB parameters on the nonlinear phenomena are clarified theoretically and experimentally.

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Evolution of structures with an open magnetic flux over a hundred years

Proceedings of the International Astronomical Union ◽

10.1017/s1743921318001862 ◽

2018 ◽

Vol 13 (S340) ◽

pp. 141-144

Author(s):

Andrey Tlatov

Keyword(s):

Solar Activity ◽

Magnetic Flux ◽

Magnetic Force ◽

Phase 1 ◽

Activity Cycle ◽

Maximum Area ◽

Open Structures ◽

Current Cycle ◽

Open Magnetic Flux ◽

Open Configuration

AbstractReconstruction of regions with an open configuration of magnetic force lines was carried out according to synoptic Hα maps over a period of more than 100 years. It is shown that the maximum area of open structures in the cycle of solar activity is reached in the descending phase, 1÷2 years before the onset of the minimum. The total area of open structures in the current cycle n has a high correlation (r ~ 0.8) with the amplitude of the next activity cycle n + 1. There is also a secular envelope with a maximum in the middle of the 20th century.

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Effect of Electromagnetic Stirring during Solidification on the Morphological Evolution of Primary Solid Phase of Al Alloy

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.116-117.665 ◽

2006 ◽

Vol 116-117 ◽

pp. 665-668 ◽

Cited By ~ 1

Author(s):

Dock Young Lee ◽

Suk Won Kang ◽

Ki Bae Kim

Keyword(s):

Magnetic Flux ◽

Flux Density ◽

Magnetic Force ◽

Solid Phase ◽

Morphological Evolution ◽

Input Voltage ◽

Input Current ◽

Magnetic Flux Density ◽

Al Alloy ◽

Α Phase

In this study, in order to develop the cast product of Al alloy having a globular microstructure by using the elctromagnetic (EM) stirrer, which was specially designed and manufactured to induce a various fluid flow type of melt during solidification, a morphlogy and size of primary solid phase of the solidifying slurry was investigated with respect to EM stirring condition such as an induced magnetic flux density (MFD) and a frequency of input current. The magnetic flux density of EM stirrer was measured by using a gaussmeter and its distribution and magnetic force within Al melt was simulated in ANSYS program. The induced MFD was increased with decreasing a frequency of input current at the same input voltage due to the increased penetrating depth of magnetic field. But, the magnetic force related directly with a stirring strength of melt was increased with the frequency. Both a roundness and size of primary α phase of Al alloy was decreased with increasing a frequency of input current and MFD within the experimental range. Therefore, the primary α phase was refined and globularized at the higher frequency and MFD.

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A Design of Mini Actuator for Compact Camera without Using Permanent Magnet

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.607.483 ◽

2014 ◽

Vol 607 ◽

pp. 483-489

Author(s):

Ching Lung Tsai ◽

Der Cherng Liaw

Keyword(s):

Magnetic Flux ◽

Permanent Magnet ◽

Magnetic Force ◽

Voice Coil Motor ◽

Power Converter ◽

Magnetic Flux Leakage ◽

Tablet Pc ◽

Spring Type ◽

Converter Design ◽

Flux Leakage

This paper presents a design of mini actuator without using permanent magnet for auto-focus (AF) compact camera module (CCM) built on mobile phone, tablet PC and notebook. The current through the coils of electromagnets will yield magnetic force to move the moving part up and down. Comparing with conventional spring-type voice coil motor (VCM) and non-spring type VCM, the proposed actuator eliminates the concerns of rare earth supply and magnetic flux leakage which can fail the function of magnetic flux sensitive device such as e-compass. The proposed actuator also simplifies the power converter design from bipolar scheme as required by conventional non-spring type VCM to unipolar. A comprehensive electromagnetic analysis is performed by using finite element method to characterize the performance of the proposed actuator. Numerical simulations demonstrate that the magnetic flux leakage in the proposed actuator is much smaller than those by conventional design.

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