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Magnetic circuit

About: Magnetic circuit is a research topic. Over the lifetime, 15707 publications have been published within this topic receiving 118099 citations.


Papers
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Journal ArticleDOI
TL;DR: A new Vernier reluctance machine is proposed, which integrates the advantages of a robust rotor structure, good torque density, and flexible flux control ability, and little demagnetization risk exists for slot PMs during flux control.
Abstract: This paper aims to propose a new Vernier reluctance machine (VRM), which integrates the advantages of a robust rotor structure, good torque density, and flexible flux control ability. The key is to establish the excitation field with both stator slot permanent magnets (PMs) and zero-sequence current. Two excitation sources have different pole pair numbers but share a parallel magnetic circuit and contribute to superimposed torque in this machine. Meanwhile, a flexible flux control can be achieved by regulating zero-sequence current, and little demagnetization risk exists for slot PMs during flux control. In this paper, the machine configuration and operation principle are introduced, along with its integrated ac and dc drive method. Electromagnetic performance of this new machine is evaluated by finite-element analysis. Leading design parameters are determined and optimized considering optimal injection ratio of zero-sequence current. A prototype is fabricated, and relevant experiment results demonstrate the feasibility of the proposed solution.

35 citations

Patent
29 Sep 1998
TL;DR: A rotating electric machine for direct connection to high-voltage networks, in which the magnetic circuit adapted for high voltage comprises a permanent magnetic rotor, stator and main and auxiliary flux control windings in operative relation, is described in this paper.
Abstract: A rotating electric machine for direct connection to high-voltage networks, in which the magnetic circuit adapted for high voltage comprises a permanent magnetic rotor, stator and main and auxiliary flux control windings in operative relation. At least one of the windings is a conductor surrounded by a magnetically permeable, field confining insulation system.

35 citations

Patent
07 Jun 1996
TL;DR: In this article, a special type of magnetic tag that serves both as an identifier of the article to which it is attached and as an antitheft device is described. But it does not describe how to use it as an anti-theft device.
Abstract: The invention relates to a special type of magnetic tag that serves both as an identifier of the article to which it is attached and as an antitheft device. Identification comes about through the use of an array of individual magnetic elements that are closely spaced, preferably along and perpendicular to an amorphous wire or strip. The wire or strip forms an integral part of the identification array and can be used as an anti-theft device to trigger an alarm when activated by an external field from a magnetic gate. The array may be personalized (coded) by leaving out elements of the array or by driving selected elements to saturation while others remain demagnetized. The elements can also be in the form of a double array to constitute `l`s and `0`s to form a code. Reading of the elements (code) is accomplished with a special reading head consisting of one or more small magnetic circuits coupled to one or more pickup loops utilizing, in some cases, the Matteucci effect.

35 citations

Patent
Nouet Christian1
11 Jan 1978
TL;DR: A planar support member for an electric circuit, eg a printed circuit board, wherein at least a region of the support member includes magnetic material through at least part of its thickness is described in this article.
Abstract: A planar support member for an electric circuit, eg a printed circuit board, wherein at least a region of the support member includes magnetic material through at least a part of its thickness A magnetic circuit is made in this material by forming at least one opening through it The support member is then coated with insulative material and conductor paths are made on both faces of the support member by conventional techniques for such members These paths include a winding disposed around a core part of the magnetic circuit with alternate half turns being formed on opposite faces and interconnected by through plating The inductive circuit thus formed may constitute an inductor, a transformer or a relay

35 citations

Journal ArticleDOI
TL;DR: In this paper, a theoretical study of the calculation of magnetic fields in vicinity of overhead electric power lines is presented, where exact and simplified methods of the determination of the magnetic field of a straight overhead conductor based on the Fourier transform technique and on the concept of complex ground return plane are presented.
Abstract: The paper presents in a tutorial manner a theoretical study of the calculation of magnetic fields in vicinity of overhead electric power lines. Exact and simplified methods of the determination of the magnetic field of a straight overhead conductor based on the Fourier transform technique and on the concept of complex ground return plane are presented. The decomposition of the magnetic fields in two components: magnetic field obtained in free space from the Biot-Savart law and the magnetic field produced by earth current is discussed. It is shown that in practical cases the effects from earth currents can be neglected as compared with effects from line currents. A solution for modeling magnetic fields produced by sagging conductor, described by the catenary equation, is also proposed. The effect of the catenary on the magnetic field spatial distribution is investigated. The calculation results of magnetic field produced by sagging conductor and the magnetic field of a conventional model consisting of a horizontal conductor hanging on the effective height lying between the maximum and minimum heights of catenaries is compared and discussed. As an example the magnetic field of a real-power catenary high voltage 2 × 220 kV power line is demonstrated. Copyright © 2006 John Wiley & Sons, Ltd.

35 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202359
2022146
2021286
2020462
2019580
2018555