Magnetic core

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

A New Model of Electromechanical Relays for Predicting the Motion and Electromagnetic Dynamics

Abstract: In this paper, a novel multiphysics and nonlinear model for electromechanical relays is presented. The electromagnetic dynamics is analyzed by calculating the total reluctance of the magnetic equivalent circuit (MEC), which is composed of a fixed length iron core and an angular air gap. Magnetic saturation and angular dependency of the reluctance are considered in the analysis. Then, an energy balance over the electromagnetic components of the system is used to obtain the torque which drives the movable armature. A planar mechanism of four rigid bodies, including spring-damping torques that restrict the motion and model the contact bounces that occur in the switchings, is proposed to explain the dynamics of the movable components. Experimental tests show the accuracy of the model in both the electromagnetic and the mechanical parts.

Magnetic core and method of manufacturing the same

Abstract: A magnetic core of a compressed compact comprises a mixture of magnetic powder and a spacing material, wherein the distance between adjacent magnetic powder particles is controlled by the spacing material. In this constitution, a magnetic core low in core loss, high in magnetic permeability, and excellent in direct-current superposing characteristic is realized.

High-Bandwidth Low-Insertion Loss Solenoid Transformers Using FeCoB Multilayers

Abstract: High-bandwidth low-insertion loss solenoid transformers using a multilayered FeCoB magnetic core have been designed, modeled, fabricated, and characterized for high-frequency power conversion. Various transformer designs are compared in terms of inductance, resistance, quality factor, mutual coupling, and insertion loss. A mutual coupling coefficient of 0.9 up to 50 MHz is achieved for intertwined solenoid transformers with a patterned magnetic core.

Finite Element Analysis of Inductor Core Loss Under DC Bias Conditions

Abstract: Finite element analysis is a popular way to analyze magnetic core loss in complex core structures. However, accurate calculation of the inductor core loss under dc bias conditions is still a challenge, as magnetic properties such as permeability and core-loss density change when a dc premagnetization is present, especially for saturable cores. This paper proposes a method that can accurately calculate the inductor's loss when it works under dc bias current conditions. The method utilizes an effective and simple material model built by curve-fitting the measurement data. To prove the accuracy of this approach, planar inductors built with low-temperature co-fired ceramic ferrite are simulated, and the calculated core losses are experimentally verified.

Plasma reactor and plasma ignition method using same

Abstract: One aspect of the present invention relates to a plasma reactor and a plasma ignition method using the same. The plasma reactor of the present invention comprises: a magnetic core having a primary winding of a transformer; an alternative current power supply source for supplying alternative current power to the primary winding of the transformer wound around a magnetic core; a plasma chamber body provided with the magnetic core and enables induction of electromotive force by directly inducing a voltage through the magnetic core; and a floating chamber connected to the plasma chamber body through an insulating region and receiving the induced electromotive force, and a large voltage difference is generated between the plasma chamber body and the floating chamber according to a phase change of the alternative current power supplied from the alternative current power supply source so as to enable easy plasma ignition and to supply the plasma to a process chamber. The plasma reactor and the plasma ignition method using the same of the present invention can separate a floating region and a region provided with a magnetic core, and enable the plasma discharge using a low voltage in comparison with a voltage necessary for an existing ignition using a large voltage difference according to a potential difference of the alternative current power. Thus, the re-ignition due to the failure of the plasma ignition is not required and the damage of the plasma reactor due to arc discharge can be minimized. In addition, the ignition for the plasma discharge can be easily implemented in a low-pressure state of a gas flow when supplying the same voltage in comparison with known devices. Furthermore, the ignition for the plasma discharge can be easily implemented at a low temperature when supplying the same voltage in comparison with known devices.