Magnetic core

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

Transferring electric energy to a vehicle by induction

Abstract: The invention relates to a system for transferring electric energy to a vehicle, in particular to a road automobile or to a track bound vehicle such as a light rail vehicle, wherein the system comprises an electric conductor arrangement (37) for producing a magnetic field and for thereby transferring the energy to the vehicle, wherein the electric conductor arrangement (37) comprises at least one current line (37a, 37b, 37c), wherein each current line (37a, 37b, 37c) is adapted to carry the electric current which produces the magnetic field or is adapted to carry one of parallel electric currents which produce the magnetic field and wherein: - the current line or lines (37a, 37b, 37c) extend(s) at a first height level, - the system comprises an electrically conductive shield (20) for shielding the magnetic field, wherein the shield (20) extends under the track and extends below the first height level, and - a magnetic core (39) extends along the track at a second height level and extends above the shield (20).

Analysis of current distribution in magnetic film inductors

Abstract: We have extended our electromagnetic model for high-frequency magnetic film inductors [A. Gromov, V. Korenivski, K. V. Rao, R. B. van Dover, and P. M. Mankiewich, IEEE Trans. Magn. 34, 1246 (1998)] to account for driving current redistribution in structures where the conductor and the magnetic film are in direct electrical contact. We consider a stripe conductor of a rectangular cross section enclosed in a magnetic film. A potential difference of fixed amplitude is applied to both the conductor and the magnetic film. Maxwell’s equations for this geometry are solved analytically, and a simple expression for the impedance is obtained. The inductance at low frequencies is practically unchanged compared to the case where the magnetic film is insulated from the conductor. However, the maximum achievable quality factor is found to be higher than that for the insulated case, even when a significant portion of the driving current flows through the magnetic film. Magnetic film inductors without insulation layers a...

On-chip inductor with magnetic core

Abstract: An inductor formed on an integrated circuit chip including one or more inner layers between two or more outer layers, inductor metal winding turns included in one or more inner layers, and a magnetic material forming the two or more outer layers and the one or more inner layers. In one embodiment, the magnetic material is a photoresist paste having magnetic particles. In another embodiment, the magnetic material is a series of magnetic metallic strips disposed on each of first and second portions of the two or more outer layers and on each of the one or more inner layers. The series of magnetic metallic strips on the first and second portions form a grid pattern. Other embodiments include an adjustable controlled compound deposit and control windings with adjustable electrical currents.

Multi-source ambient energy power supply for embedded devices or remote sensor or RFID networks

Abstract: An ambient electromagnetic energy collector has a magnetic core of high permeability ferromagnetic material wrapped in an inductor coil for coupling primarily to a magnetic field component of a propagating transverse electromagnetic (TEM) wave. For coupling to electromagnetic waves of a wide range of frequencies and magnitudes, the collector is coupled to a multi-phase transformer connected to a multi-phase diode voltage multiplier to provide a current source output to an associated energy storage device. An output controller supplies output power as needed to the associated energy-using device. Preferred types of ferromagnetic materials include nickel-iron alloys with a small percentage of silicon, molybdenum, or copper. It may be combined with other types of ambient energy collectors, such as acoustic/vibration, thermoelectric, and photovoltaic collectors, in a multi-source device provided with a collector interface for converting the different outputs for storage in a common energy storage device. The multi-source ambient energy collector device can be used to supply power to embedded devices, remotely deployed wireless sensors or RFID tags, and other types of monitoring devices distributed over large areas or in industrial environments.

The theoretical output of a ring core fluxgate sensor

Abstract: This article proves that the output from a ring core sensor is directly proportional to the first time derivative of the product of dynamic permeability and magnetic intensity perturbation within the core caused by an external, uniform magnetic field. (Dynamic permeability is defined to be the slope of the hysteresis loop at a given point in time.) Assuming that ellipsoidal shells can approximate the core, the demagnetization factor can be "estimated" in the first order to be proportional to the first power of the quantity tape thickness (or number of wraps) divided by the core diameter. The constant of proportionality is determined from laboratory data. When an additional scale adjustment is applied to the resulting sensor output formula, the computed output tracks laboratory data for a range of sensor geometries.