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Magnetic core

About: Magnetic core is a research topic. Over the lifetime, 30011 publications have been published within this topic receiving 155247 citations.


Papers
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Journal ArticleDOI
TL;DR: In this article, the performances of three types of magnetic gears (MGs) are quantitatively analyzed and compared using 3-D finite-element method of magnetic field and mechanical motion coupled computation.
Abstract: The performances of three types of magnetic gears (MGs), which are radial-flux MGs, transverse-flux MGs, and axial-flux MGs, are quantitatively analyzed and compared using 3-D finite-element method of magnetic field and mechanical motion coupled computation. To fairly compare the torque capability of different topologies of MGs, all the MGs under study have the same gear ratio, the same outer diameter, and the same axial stack length. To maximize the torque density, several important structure parameters are optimized. Scenarios using different iron core materials and different magnetization directions of permanent magnets are also studied. Based on the comparative analysis, appropriate topologies of MGs that can achieve a torque density as high as 198 kNm/m 3 are suggested. The results in this paper give a good review of the torque density levels of different MGs, and hence they can be used as application guidelines.

48 citations

Patent
Yasuhiro Wasa1, Yojiro Kondo1, Tokuki Miura1
08 Nov 1985
TL;DR: In this paper, an improved magnetic object detecting system having high sensitivity and noise immunity is disclosed, where the detection system is of the type having a stimulation coil for generating a magnetic field and a pair of magnetic field detection coils, and the stimulation coil is of a magnetic core type employing magnetic core.
Abstract: An improved magnetic object detecting system having high sensitivity and noise immunity is disclosed. The detection system is of the type having a stimulation coil for generating a magnetic field and a pair of magnetic field detection coils, and the stimulation coil is of a magnetic core type employing a magnetic core.

47 citations

Patent
02 Apr 1997
TL;DR: In this paper, a process for producing single-layer or multi-layer microcoils or microcoil arrays that optionally have a magnetic core area to increase the coil inductance and to guide the magnetic flux is described.
Abstract: A process for producing single-layer or multi-layer microcoils or microcoil arrays that optionally have a magnetic core area to increase the coil inductance and to guide the magnetic flux. In this process, plastic films (e.g., made of polyimide or polyester), are applied using pressure and heat to serve as the insulation layers. This eliminates the need for curing the insulation and expensive leveling operations.

47 citations

Journal ArticleDOI
TL;DR: In this paper, a theoretical and experimental analysis has been made of the geometrical and magnetic factors affecting the sensitivity of the ring-core magnetometer first introduced by Geyger in 1961.
Abstract: A theoretical and experimental analysis has been made of the geometrical and magnetic factors affecting the sensitivity of the ring-core magnetometer first introduced by Geyger in 1961. Using a drive-to-pickup transfer function derived from an assumed dynamic hysteresis loop and a given dc input signal, the second-harmonic output voltage was derived for both current-source and voltage-source driving conditions. Results of the analysis, which were confirmed by experiment, show the following. 1) When a single, diametrically wound (solenoid-type) pickup winding is used with a ring-core sensor, simultaneous minimization of both fundamental and second-harmonic feedthrough can be achieved by a simple rotational adjustment. This optimization is possible only with a circular core. 2) Sensitivity can be increased by increasing frequency, number of pickup turns, dynamic differential permeability, cross-sectional area, and effective sensor length, and by decreasing the dc initial permeability (μ 0 ). 3) The dominant factor affecting the sensitivity is the demagnetizing term \mu_{0}K = \mu_{0}l^{-1.72} (4A/\pi)^{0.86} , which determines the entrance attenuation of the dc signal to be measured. Highest sensitivity is obtained when \mu_{0}K is small, which requires a low initial permeability, since a large dimensional ratio l/A^{1/2} is usually not attainable. When the demagnetizing term is not small, the sensitivity advantages of the other factors are negated by the input signal attenuation. Power considerations show that increasing sensitivity by raising area, length, or frequency results in increased power consumption. However, increasing sensitivity by using a pickup coil with a larger number of turns or by a sensor core with lower initial permeability can be achieved without additional power.

47 citations

Patent
27 Sep 1991
TL;DR: In this paper, a magneto-resistance effect type magnetic head incorporating a grounded conductive layer, a second thin film magnetic core and an MR sensing part, the conductive layers being located near the thin-film magnetic core, the layer and the core being electrically connected.
Abstract: A magneto-resistance effect type magnetic head incorporates a grounded conductive layer, a second thin film magnetic core and an MR sensing part, the conductive layer being located near the thin film magnetic core, the layer and the core being electrically connected. The conductive layer is further connected electrically to an electrode of the MR sensing part, the electrode facing an air bearing surface. This setup protects the MR sensing part from static electricity destruction, thus providing a magneto-resistance effect type magnetic head of high reliability.

47 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202365
2022163
2021309
2020900
20191,254
20181,426