Topic
Magnetic circuit
About: Magnetic circuit is a research topic. Over the lifetime, 15707 publications have been published within this topic receiving 118099 citations.
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Papers
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TL;DR: In this article, the influence of voltage subharmonics and interharmonics on an induction cage machine was investigated, and the results of measurements and calculations were compared for various machine models.
Abstract: This study deals with the influence of voltage subharmonics and interharmonics on an induction cage machine. The windings current subharmonics and interharmonics as well as the magnetising current are studied. The effect of voltage subharmonics and interharmonics on windings temperature rise is analysed. The results of measurements and calculations are compared for various machine models. The appropriate investigations are performed for two low-power, totally enclosed induction motors of different properties: a machine with a comparatively strongly saturated magnetic circuit, and one with a comparatively weakly saturated magnetic circuit.
30 citations
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26 Sep 1985TL;DR: In this article, a positioning device of magnetic suspension type is described, which comprises a cylindrical stationary member and a floating member arranged coaxially with the stationary member, supported by the magnetic forces produced by a plurality of magnetic circuits.
Abstract: A positioning device of magnetic suspension type is disclosed, which comprises a cylindrical stationary member and a cylindrical floating member arranged coaxially with the stationary member. The floating member is supported in non-contact state with respect to the stationary member by the magnetic forces produced by a plurality of magnetic circuits. The device further includes at least one control coil disposed such that it crosses the flux passing through the magnetic circuit. When the control coil is energized, it receives an electromagnetic force for displacing the floating member in co-operation with the flux from the magnetic circuit.
30 citations
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TL;DR: In this article, the optimum operating condition of a magnetic refrigerator at room temperature for direct air-cooling was analyzed for a variety of conditions such as a volumetric flow rate of air, a packing length of magnetic working substance, and a heat exchange cycle.
Abstract: The purpose of this study is to understand the optimum operating condition of magnetic refrigerator at room temperature for direct air-cooling. The basic components of the target system are a magnetic circuit including two permanent magnets, a test section, an air blower, and an associated instrumentation. The test section consists of 10 test cells which enclose gadolinium chips as a magnetic working substance in a prescribed packing rate. In order to change the applied magnetic field from 0 to 0.9 T, the magnetic circuit is installed on an electric slider which generates reciprocating motion. The system performances are widely investigated both experimentally and analytically for the variety of conditions such as a volumetric flow rate of air, a packing length of magnetic working substance, and a heat exchange cycle. The results reveal that the present magnetic refrigerator has a maximum value of the cooling rate in an appropriate operating condition.
30 citations
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14 Aug 1996TL;DR: In this paper, a passive magnetic bearing structure for radially supporting a rotor with respect to a stator is provided, in which a magnetic circuit is mounted on the rotor or stator for generating two strongly different axial magnetic fields in two concentric angular gaps coaxial to the rotation axis and radially spaced from one another.
Abstract: A passive magnetic bearing structure for radially supporting a rotor with respect to a stator is provided, in which a magnetic circuit is mounted on the rotor or stator for generating two strongly different axial magnetic fields in two concentric angular gaps coaxial to the rotation axis and radially spaced from one another. At least three shortened superconducting turns are mounted on the stator circumferentially around the rotation axis so that under any tolerable shift of the rotor, one edge of every turn will be placed in one annular gap comprising magnetic field, and the radially opposite edge will be placed in the other gap. The invention is also directed to a linear magnetic bearing structure for restricting unwanted movement of a slider, comprising the slider, a guideway, and a magnetic circuit mounted on the slider or guideway for generating two strongly different magnetic fields perpendicular to the movement direction, in two different layers lengthened in the sliding direction and spaced from one another in the direction normal to both the sliding and magnetic field directions. A shortened superconducting turn is mounted on the slider or guideway so that any tolerable shift of the slider, one edge of every turn will be placed in one layer comprising magnetic field, and the radially opposite edge will be placed in the other layer.
30 citations
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TL;DR: In this article, a coupled inductor balancing method was developed to overcome cell voltage variation among cells in series, for Lithium Ion (Li-ion) batteries in Electrical Vehicles (EV), which is suitable for fast equalization due to the inductor-based balancing method.
Abstract: This article developed a coupled inductor balancing method to overcome cell voltage variation among cells in series, for Lithium Ion (Li-ion) batteries in Electrical Vehicles (EV). For an "eight cells in series" example, the developed balance circuit has four inductors, one magnetic circuit with one winding per two cells, and one control switch per cell, as compared to the traditional inductor-based equalizer that needs N-1 inductors and magnetic circuits for N number of cells and more switches. Therefore, ultimately, a more efficient, cost-effective circuit and low bill of materials (BOM) will be built up. All switches are logic-level N-Channel metal-oxide-semiconductor field-effect transistors (MOSFETs) and they are controlled by a pair of complementary signals in a synchronous trigger pattern. In the proposed topology, less components and fast equalization are achieved compared to the conventional battery management system (BMS) technique for electrical vehicles based on the inductor balancing method. This scheme is suitable for fast equalization due to the inductor-based balancing method. The inductors are made with a well-chosen winding ratio and all are coupled with one magnetic core with an air gap. Theoretical derivation of the proposed circuit was well-presented, and numerical simulation relevant to the electrochemical storage devices was conducted to show the validity of the proposed balance circuit. A complete balance circuit was built to verify that the proposed circuit could resolve imbalance problems which existed inside battery modules.
30 citations