Topic
Magnetic core
About: Magnetic core is a research topic. Over the lifetime, 30011 publications have been published within this topic receiving 155247 citations.
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TL;DR: In this article, a novel underwater loosely coupled transformer (LCT) based on the semiclosed magnetic core structure is proposed to prevent magnetic flux leakage to the maximal extent, increase the coupling coefficient of high-power inductive power transfer (IPT) system, and reduce the electromagnetic radiation in water medium.
Abstract: To prevent magnetic flux leakage to the maximal extent, increase the coupling coefficient of high-power inductive power transfer (IPT) system, and reduce the electromagnetic radiation in water medium, a novel underwater loosely coupled transformer (LCT) based on the semiclosed magnetic core structure is proposed in this paper. Power loss of the devised LCT is investigated comparatively in three media including air, freshwater, and seawater. It is shown that winding loss and core loss in the three media are basically identical. However, additional eddy current (AEC) loss in various water media is different for the sake of the difference in conductivity. In particular, AEC loss is extremely low in freshwater and relatively significant in seawater. Furthermore, when the operating frequency exceeds a certain value, AEC loss will be greater than core loss and winding loss, and become the major factor in restricting transmission efficiency of LCT in seawater. Finally, theoretical analysis and simulation are demonstrated by the underwater experiment on an IPT prototype system, which can transfer 10 kW at 91% maximal transmission efficiency and over a 25 mm air gap.
123 citations
TL;DR: In this article, a planar 3-dimensional magnetic fluxgate sensor based on micromachined 3D toroidal type planar coils used as excitation and sensing elements is presented, which has excellent linear response over the range of −500 μT to +500 µT with a system sensitivity of 8360 V T−1 and a resolution of 60 nT.
Abstract: This paper presents a new micro-fluxgate magnetic sensor based on micromachined 3-dimensional toroidal type planar coils used as excitation and sensing elements. A rectangular-ring shaped magnetic core and the `second harmonic' operation principle are adopted in this fluxgate sensor. With the use of a newly developed UV-LIGA thick photoresist process and electroplating techniques, excitation and sensing coils as well as permalloy magnetic cores were fabricated to realize a planar three-dimensional magnetic fluxgate sensor on silicon wafers. Excellent linear response over the range of −500 μT to +500 μT, with a system sensitivity of 8360 V T−1 and a resolution of 60 nT was achieved from the sensor realized in this work. The total response range of the sensor is −1.3 to +1.3 mT. The electroplated thick, Cu coil windings result in low coil resistance and a low power consumption of ∼100 mW for an operational frequency range of 1–100 kHz. The small size, the high sensitivity and resolution, and lower power consumption, make this integratable magnetic fluxgate sensor suitable for various applications such as: portable navigation systems, space research, and proximity sensors and detectors.
122 citations
Patent•
03 Apr 2006
TL;DR: In this paper, a core-shell structure for soft magnetic core components has been proposed, where the central core is made of magnetic material and is used for providing the necessary magnetic property for the magnetic core component made from the ferromagnetic powder.
Abstract: A particle (10) of ferromagnetic powder for use in preparation of soft magnetic core components has a core-shell structure. The particle includes a central core (12) and a shell (14) coated on the central core. The central core is made of magnetic material and is used for providing the necessary magnetic property for the magnetic core components made from the ferromagnetic powder. The shell has a higher electrical resistance than the central core so as to reduce an eddy current loss of the magnetic core component. The shell also functions to provide an excellent bonding strength between particles of the powder.
122 citations
TL;DR: In this article, an efficient full domain method for plasma equilibrium construction in iron core tokamaks is described, and the results show that the two methods are in agreement with respect to global plasma parameters such as stored energy, internal inductance, volume, and edge safety factor.
Abstract: An efficient full domain method for plasma equilibrium construction in iron core tokamaks is described. Illustrative calculations and comparison with results obtained from a finite domain method using JET data are given. The results show that the two methods are in agreement with respect to global plasma parameters such as stored energy, internal inductance, volume, and edge safety factor. However, when there is an uncertainty in the magnetic flux loop measurement, the full domain method yields a more accurate separatrix location
122 citations
TL;DR: In this article, the magnetic properties required of non-oriented electrical steel sheets are discussed from the viewpoint of reducing core losses in generators and motors by taking into consideration the magnetic flux distribution in the core.
121 citations