Magnetic core

The magnetic properties of core/shell nanoparticles (NPs) depend on the various parameters, including the magnetic interactions, but these effects have not been well studied. Here, we systematically investigated the structure and magnetic properties of Fe3O4@CoFe2O4 core/shell NPs. X-ray diffraction (XRD), scanning electron microscopy (SEM), and scanning transmission electron microscopy (STEM) confirmed the formation of Fe3O4@CoFe2O4 core/shell NPs.

6p visergeyne 18-06-2024 0 0   Download

Part 1 book "Transformer design principles" includes content: Introduction to transformers; transformer circuit models, including magnetic core characteristics, and applications; reactance calculations; fault current calculations; rabins’ method for calculating leakage fields, forces, and inductances in transformers; mechanical design; capacitance calculations.

293p dianmotminh03 17-06-2024 0 0   Download

Part 1 book "Electromagnetics for electrical machines" includes content: Introduction, review of field equations, theorems, revisited, laplacian fields, eddy currents in magnetic cores.

187p dianmotminh01 20-05-2024 1 1   Download

Part 1 book "Transformer design principles" includes content: Introduction; magnetism and related core issues; circuit model of a 2-winding transformer with core; reactance and leakage reactance calculations, phasors, 3-phase connections and symmetrical components; fault current analysis; phase shifting and zigzag transformers; multiterminal 3-phase transformer model; Rabins’ method for calculating leakage fields, inductances and forces in iron core transformers, including air core methods; mechanical design.

299p dianmotminh00 22-04-2024 5 3   Download

In ebook "Complex macromolecular systems II (Advances in polymer science, Volume 228)" the combination and interplay of these well-balanced “internal fields” with “external fields” such as mechanical, electrical, magnetic, electromagnetic, and/or the interactions with surfaces are a powerful tool to create defect-free and perfectly ordered macromolecular structures on a macroscopic scale, leading to new material properties, processes, and applications.

221p manmanthanhla0201 26-02-2024 4 1   Download

In this research work, a self-sealing component for rotary shaft of Magneto-rheological (MR) fluid based devices such as MR brakes and MR clutches is designed and tested by both simulation and experiment. The sealing component is composed of a permanent magnet and a magnetic core placed on a rotary shaft to replace a traditional lip-seal.

9p vimarillynhewson 02-01-2024 6 2   Download

This study presents an innovative method for the selection and design of magnetic cores for DC-DC converters. In contrast to conventional approaches that rely on the Area Product (U`) and involve extensive trial and error, our proposed methodology employs two main key parameters: the Core to Copper Loss Ratio (γ) and the Window Utilization Factor (rd) during the inductor design process.

7p vimichaelfaraday 28-12-2023 7 6   Download

This research introduces a novel approach to selecting and designing magnetic cores for DC power optimizers. Unlike traditional methods that depend on the Area Product (Ap) and involve extensive trial and error to achieve the final design, the proposed methodology utilizes two essential parameters: the Core to Copper Loss Ratio (γ) and the Window Utilization Factor (ku) for the inductor design process.

7p vimichaelfaraday 14-12-2023 10 6   Download

"Standard Test Method for Alternating-Current Magnetic Properties of Materials at Power Frequencies Using Wattmeter-Ammeter-Voltmeter Method and 25-cm Epstein Test Frame" covers tests for the magnetic properties of basic flat-rolled magnetic materials at power frequencies (25 to 400 Hz) using a 25-cm Epstein test frame and the 25-cm double-lap-jointed core. It covers the determination of core loss, rms exciting power, rms and peak exciting current, and several types of ac permeability and related properties of flat-rolled magnetic materials under ac magnetization.

17p hth_hn_vn 10-12-2023 10 4   Download

"Standard Test Method for Alternating Current Magnetic Properties of Materials Using the Wattmeter-Ammeter-Voltmeter Method, 100 to 10 000 Hz and 25-cm Epstein Frame" covers the determination of the magnetic properties of flat-rolled magnetic materials using Epstein test specimens with double-lap joints in the 25-cm Epstein frame. It covers determination of core loss, rms and peak exciting current, exciting power, magnetic field strength, and permeability.

11p hth_hn_vn 10-12-2023 6 4   Download

This test method covers dc ballistic testing for the determination of basic magnetic properties of materials in the form of ring, toroidal, link, double-lapped Epstein cores, or other standard shapes which may be cut, stamped, machined, or ground from cast, compacted, sintered, forged, or rolled materials. It includes tests for normal induction and hysteresis taken under conditions of steep wavefront reversals of the direct-current magnetic field strength.

8p hth_hn_vn 10-12-2023 10 4   Download

This test method covers the determination of the magnetic performance of fully processed cores for magnetic amplifier-type applications. Tests may be conducted at excitation frequencies of 60, 400, 1600 Hz, or higher frequencies.

17p hth_hn_vn 10-12-2023 9 4   Download

This practice covers the procedure for designating (within ASTM specifications) standard grades of flat-rolled electrical steels made to specified maximum values of specific core loss. This practice applies to magnetically soft irons and steel (low-carbon steels and alloys of iron with silicon, aluminum, and other alloying elements) where a core loss measurement at a stated peak value of alternating induction and a stated frequency, such as 1.5 T (15 kG) and 60 Hz, is normally used to grade the material.

4p hth_hn_vn 10-12-2023 7 4   Download

This specification covers the detailed requirements to which flat-rolled nonoriented fully processed electrical steel shall conform. This steel is produced to specified maximum core-loss values and is intended primarily for commercial power frequency (50 and 60 Hz) applications in magnetic devices. Desirable core-loss and permeability characteristics are developed during mill processing, so additional heat treatment by the user is usually not necessary

6p hth_hn_vn 10-12-2023 6 4   Download

This specification covers the detailed requirements to which flat-rolled, nonoriented semiprocessed electrical steel shall conform. This steel is produced to specified maximum core-loss values and is intended primarily for commercial power frequency (50 and 60 Hz) applications in magnetic devices. Desirable core-loss and permeability characteristics are developed through heat treatment by the user.

6p hth_hn_vn 10-12-2023 7 4   Download

This test method covers the determination of several ac magnetic properties of laminated cores made from flat-rolled magnetic materials. This test method covers test equipment and procedures for the determination of impedance permeability and exciting power from voltage and current measurements, and core loss from wattmeter measurements. These tests are made under conditions of sinusoidal flux.

11p hth_hn_vn 10-12-2023 12 5   Download

This specification covers cold-rolled carbon sheet steel used for magnetic applications. These products, commonly called “cold-rolled magnetic lamination steel” (CRML) are usually intended for applications in which the stamped laminations or assembled core structures for electrical equipment are annealed to develop the desired core loss and permeability characteristics.

5p hth_hn_vn 10-12-2023 9 4   Download

This specification covers commonly used wrought nickel-iron soft magnetic alloys produced or supplied expressly for use in magnetic cores and other parts requiring high magnetic permeability, high electrical resistivity, low coercive field strength, and low core loss.

6p hth_hn_vn 10-12-2023 7 5   Download

This test method provides a means for determination of the impedance permeability of ferromagnetic materials under the condition of sinusoidal current (sinusoidal H) excitation. Test specimens in the form of laminated toroidal cores, tape-wound toroidal cores, and link-type laminated cores having uniform cross sections and closed flux paths (no air gaps) are used. The method is intended as a means for determining the magnetic performance of ferromagnetic strip having a thickness less than or equal to 0.025 in. [0.635 mm].

4p hth_hn_vn 10-12-2023 13 4   Download

This test method provides dc hysteresigraph procedures (B-H loop methods) for the determination of basic magnetic properties of materials in the form of ring, spirally wound toroidal, link, double-lapped Epstein cores, or other standard shapes that may be cut, stamped, machined, or ground from cast, compacted, sintered, forged, or rolled materials. It includes tests for normal induction and hysteresis loop determination taken under conditions of continuous sweep magnetization. Rate of sweep may be varied, either manually or automatically at different portions of the curves during measurement.

12p hth_hn_vn 10-12-2023 7 3   Download