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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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Patent
29 Jan 1993
TL;DR: In this article, the magnetic circuit is constructed such that its number of slots per each pole and each phase is 0.5 and that its winding system is of concentrated winding, and the total length of its stator coils can be reduced compared with that of the conventional machine.
Abstract: An AC generator for use in motor vehicles which is high in power generation and cooling efficiency. The magnetic circuit is so constructed that its number of slots per each pole and each phase is 0.5 and that its winding system is of concentrated winding. With such a construction, the total length of its stator coils can be reduced compared with that of the conventional machine. In addition, its output and efficiency are improved by the reduced temperature rise and a reduction in its structure and cost can be achieved by the reduced consumption of copper.

41 citations

Journal ArticleDOI
TL;DR: In this paper, the optimal split ratio for maximum thrust force is investigated analytically for both surface-mounted permanent magnet (SPM) and interior permanent magnet E-core linear oscillating actuators.
Abstract: The split ratio, i.e., the ratio of stator bore radius to stator outer radius, is an important design parameter for permanent-magnet (PM) linear machines, as it significantly influences the thrust force capability and efficiency. The optimal split ratio for maximum thrust force is investigated analytically for both surface-mounted PM (SPM) and interior PM (IPM) E-core linear oscillating actuators. It utilizes simple lumped magnetic circuit models and accounts for the magnetic saturation, the curvature effect, the fringing effect, and the armature reaction effect which may greatly affect the accuracy of the analytical model for the optimal split ratio. The optimal split ratio for both SPM and IPM prototype actuators is found to be around 0.55. The developed analytical models are validated by both finite-element analyses and measurements.

41 citations

Journal ArticleDOI
TL;DR: In this article, a bidirectional cross-linking transverse flux permanent magnet synchronous motor is presented, which has a larger space utilization ratio than the traditional transverse magnet machine.
Abstract: In this paper, a bidirectional cross-linking transverse flux permanent magnet synchronous motor is presented, which has a larger space utilization ratio than the traditional transverse flux machine. The stator core unit can make full use of rotor permanent magnets, and effectively increases no-load back-electromotive force (back-EMF), with the features of easy manufacturing. The structure and the driving principle of this motor are introduced. The 3-D magnetic circuit model is established, and the analytical expression of the no-load back-EMF and the torque are derived. In addition, the magnetic field and torque are analyzed by the 3-D finite element method (FEM). A prototype was designed and manufactured. The back-EMF and static torque experiments were carried out. The theoretical analyses agreed with the experimental results well. That verified the validity of the theoretical analysis.

41 citations

Journal ArticleDOI
TL;DR: A review of magnetic field measurement can be found in this paper, where a number of techniques for magnetic field measurements have been described, used or developed in the period of about twenty years since the last review of the subject.
Abstract: Descriptions which are briefly theoretical and essentially practical are given of a number of the techniques of magnetic field measurement, used or developed in the period of about twenty years since the last review of the subject. Particular attention is given to the application of the phenomenon of magnetic resonance while other subjects discussed are magneto-resistance, Hall effect, peaking strips, the generator principle and various fluxmeters. The uses which are made of the force exerted on a current-carrying conductor in a magnetic field are given though some of these are not, strictly speaking, field measurements. The measurement of the position of the magnetic median plane of a magnet is discussed. The last paragraphs are devoted to a description of a few methods which do not find very wide application. A list of about 150 references is appended. These are classified in groups under the heading of each particular method.

41 citations

Journal ArticleDOI
TL;DR: In this paper, the optimal design of permanent magnetic bearings in terms of maximum stiffness per magnet volume ratio is investigated, and general conclusions regarding cross section dimension, type of magnetization, and magnetic pole number are presented regarding the influence of design parameters on maximum material utilization.
Abstract: This paper investigates the optimal design of passive permanent magnetic bearings in terms of maximum stiffness per magnet volume ratio. Examining the influence of design parameters on maximum material utilization, we present general conclusions regarding cross section dimension, type of magnetization, and magnetic pole number. Furthermore, we provide generalized design plots for selected configurations, which can be used for rapid dimensioning of bearings with adequate raw material utilization. The analytical computation method used for all calculations is based on the interaction energy of elementary magnetic dipoles and thus supports any kind of magnetization, including when strength and direction may vary within the cross section of the magnetic rings. Although the design problem is 3-D and the analytical method 2-D, the resulting error is negligible for most of the practical applications.

41 citations


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