scispace - formally typeset
Search or ask a question
Topic

Magnetic core

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


Papers
More filters
Journal ArticleDOI
TL;DR: In this paper, the core loss of a permanent magnet transverse flux motor (TFM) with soft magnetic composite stator core and mild steel rotor yoke is computed based on modified core loss models and finite element magnetic field analysis (FEA).
Abstract: This paper presents the core loss computation in a permanent magnet transverse flux motor (TFM) with soft magnetic composite stator core and mild steel rotor yoke, in which the magnetic fluxes rotate. The computation is based on modified core loss models and finite element magnetic field analysis (FEA). The coefficients for the core loss models are obtained by curve-fitting measurements on samples, and the magnetic flux density patterns in the motor are obtained by time-stepping FEA while operating conditions are considered. The computations of the motor core losses agree with the measured values on the TFM prototype. Index Terms—Core loss, finite element analysis, rotating magnetic flux, soft magnetic composite, transverse flux motor.

35 citations

Patent
27 May 1977
TL;DR: In this paper, a method and apparatus for a stored magnetic field in a superconducting, rotating electrical machine is described, which includes a cylinder of superconductive material in which a magnetic field is trapped.
Abstract: Method and apparatus are provided for a stored magnetic field in a superconducting, rotating electrical machine. The apparatus includes a cylinder of superconductive material in which a magnetic field is trapped. The trapped magnetic field forms a magnetic circuit with an armature winding in the machine. The apparatus further includes means for generating a magnetic pattern field in the superconductive cylinder and means for cooling the cylinder so that a magnetic field can be trapped therein. The apparatus has application in both motors and generators and in both rotating and stationary magnetic fields used therein.

35 citations

Journal ArticleDOI
TL;DR: In this paper, a new measurement method using dual heterodyne laser interferometers is proposed to overcome the drawbacks of the old measurement setup and the working principles are explained, and the possibility to apply both techniques on one and the same sample can also reveal some interesting results about the quality of both techniques.
Abstract: Electrical machines and transformers have a core built out of laminations of ferromagnetic materials. A portion of the vibrations and noise of these devices is due to magnetic forces and magnetostriction arising from the magnetic core. Magnetic forces are well known, and analytical methods are extensively used to calculate them. Magnetostriction can be defined as the deformation of the ferromagnetic material in the presence of a magnetic field. Unlike magnetic forces, magnetostriction shows a rather complex behavior. It varies for every material, and it depends on the applied magnetic field and external pressure. Therefore, magnetostrictive behavior of every material needs to be determined experimentally by means of strain measurements. Strain gauge measurement techniques have been used before at the Electrical Energy Laboratory (EELAB), Ghent University, Ghent, Belgium. In this paper, a new measurement method using dual heterodyne laser interferometers is proposed to overcome the drawbacks of the old method. The proposed measurement setup and the working principles are explained. The possibility to apply both techniques on one and the same sample can also reveal some interesting results about the quality of both techniques.

35 citations

Patent
24 Jun 1996
TL;DR: In this paper, a dc-to-dc converter is implemented on a UI magnetic core in such a manner as to satisfy a zero-ripple condition k 1 =n of current in the output inductor, where n is a turns ratio of the loosely coupled input and output inductors.
Abstract: In a dc-to-dc converter, input and output inductors loosely coupled and isolation transformer windings closely coupled are implemented on a UI magnetic core in such a manner as to satisfy a zero-ripple condition k 1 =n of current in the output inductor, where n is a turns ratio of the loosely coupled input and output inductors, and both inductors are chosen to have the same number of turns, and that number is an integer such that the value of the coupling coefficient k 1 required to satisfy the zero-ripple condition is one achieved by modeling of core leakages instead of by adjusting the turns ratio n, thus making it feasible to implement the coupled inductors, and the transformer windings as well, in a single UI core and modeling the core losses by configuring the core. It is then possible to implement the core legs that are long enough to just accommodate a printed circuit board on which all of the windings are manufactured for a low profile package with both inductor windings on the same leg opposite the transformer windings. If the input inductor is on the same leg of the core as the transformer windings, adding an external inductor in series with the input inductor will filter any ripple current coupled into it by the transformer flux.

35 citations

Journal ArticleDOI
TL;DR: In this article, the inductive components that consist the heart of the power transformers are made of ceramic ferromagnetic materials of the type (Mnx ZnyFe 2+ ).
Abstract: At power electronic applications (e.g. in automotive, lighting, electrical equipment etc.) the inductive components that consist the heart of the power transformers are made of ceramic ferromagnetic materials of the type (Mnx ZnyFe 2+

35 citations


Network Information
Related Topics (5)
Electromagnetic coil
187.8K papers, 1.1M citations
88% related
Voltage
296.3K papers, 1.7M citations
86% related
Capacitor
166.6K papers, 1.4M citations
84% related
Rotor (electric)
179.9K papers, 1.2M citations
84% related
Electric power system
133K papers, 1.7M citations
80% related
Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202365
2022163
2021309
2020900
20191,254
20181,426