254results about How to "Reduce skin effect" patented technology

A multilayer printed circuit board (“PCB”) coil that simulates a coil formed from litz wire. The PCB includes a plurality of alternating conductor and insulating layers interconnected to cooperatively form the coil. Each conductor layer includes a trace that follows the desired coil shape and is divided into a plurality of discrete conductor segments. The segments are electrically connected across layers to provide a plurality of current flow paths (or filaments) that undulate between the layers in a regular, repeating pattern. The coil may be configured so that each filament spends a substantially equal amount of time in proximity to the paired coil and therefore contributes substantially equally to the self or mutual inductance of the coil. Each conductor layer may include a plurality of associated traces and intralayer connector that interconnected so that each filament undulates not only upwardly/downwardly, but also inwardly/outwardly in a regular, repeating pattern.

A multi-layer, multi-turn structure for an inductor having a plurality of conductor layers separated by layers of insulator is described. The inductor further comprises a connector electrically connected between the conductor layers. The structure of the inductor may comprise a cavity therewithin. The structure of the inductor constructed such that electrical resistance is reduced therewithin, thus increasing the efficiency of the inductor. The inductor is particularly useful at operating within the radio frequency range and greater.

An integrated electronic device includes a substrate, passive components, pads for external connection, and three-dimensional wiring. The passive components includes a multi-stage coil inductor provided on the substrate. The multi-stage coil inductor has a plurality of coils disposed in several layers. Mutually adjacent coil wires are spaced-apart from each other. The three-dimensional wiring includes a first wiring portion which extends on the substrate, a second wiring portion which extends off the substrate but along the substrate, and a third wiring portion connecting with the first wiring portion and the second wiring portion.

A multi-layer, multi-turn structure for an inductor having a plurality of conductor layers separated by layers of insulator is described. The inductor further comprises a connector electrically connected between the conductor layers. The structure of the inductor may comprise a cavity therewithin. The structure of the inductor constructed such that electrical resistance is reduced therewithin, thus increasing the efficiency of the inductor. The inductor is particularly useful at operating within the radio frequency range and greater.

A multi-layer, multi-turn structure for an inductor having a plurality of conductor layers separated by layers of insulator is described. The inductor further comprises a connector electrically connected between the conductor layers. The structure of the inductor may comprise a cavity therewithin. The structure of the inductor constructed such that electrical resistance is reduced therewithin, thus increasing the efficiency of the inductor. The inductor is particularly useful at operating within the radio frequency range and greater.

A multi-layer, multi-turn structure for an inductor having a plurality of conductor layers separated by layers of insulator is described. The inductor further comprises a connector electrically connected between the conductor layers. The structure of the inductor may comprise a cavity therewithin. The structure of the inductor constructed such that electrical resistance is reduced therewithin, thus increasing the efficiency of the inductor. The inductor is particularly useful at operating within the radio frequency range and greater.

A multi-layer, multi-turn structure for an inductor having a plurality of conductor layers separated by layers of insulator is described. The inductor further comprises a connector electrically connected between the conductor layers. The structure of the inductor may comprise a cavity therewithin. The structure of the inductor constructed such that electrical resistance is reduced therewithin, thus increasing the efficiency of the inductor. The inductor is particularly useful at operating within the radio frequency range and greater.

A multi-layer, multi-turn structure for an inductor having a plurality of conductor layers separated by layers of insulator is described. The inductor further comprises a connector electrically connected between the conductor layers. The structure of the inductor may comprise a cavity therewithin. The structure of the inductor constructed such that electrical resistance is reduced therewithin, thus increasing the efficiency of the inductor. The inductor is particularly useful at operating within the radio frequency range and greater.

An improved structure of audio signal cable, the features of which are that the audio signal cable is comprised of arrayed solid and tinsel wire conductors. After each of the conductors are insulated and bundled, they are placed into a surrounding insulation. The solid conductors are of a circular and a flat, thin shape. The solid conductors are of differing larger and smaller diameters and, furthermore, disposed in unequal quantities. The smaller diameter tinsel wires are twisted to increase distance and enlarge their surface area to reduce skin effect for better high frequency transmission, while the larger diameter conductors enable the rapid conveyance of low frequencies. As such, the present invention achieves the synchronous phasing of high and low frequency signals.

The invention relates to a coil of a magnetic resonance imaging system, and a cooling device and a cooling method thereof. The coil of the magnetic resonance imaging system is formed by winding a hollow wire which is made of a magnetic compatible conducting material. In the coil of the magnetic resonance imaging system, and the cooling device and the cooling method thereof, the coil is formed by winding the hollow wire, and the cross sectional area of a cylindrical coil is increased; a conductor skin effect is reduced due to the increase of the cross sectional area, so that the radiating power of the coil is reduced, and the effect of generating less heat is achieved; and the hollow wire is made of the magnetic compatible conducting material, so that the influence on a magnetic field is reduced and the performance of a gradient coil is improved.

The invention relates to a method for launching a marine controlled-source electromagnetic exploration system. One generator unit, two inverters, two rectifier and filter circuits, one control circuit, one voltage detection circuit, one current detection circuit as well as a tow cable and an electrode assembly are included, wherein the generator unit provides a three-phase power supply to the system; the inverter and rectifier circuits are used for finishing AC-DC and DC-AC conversions of the power supply in the signal transmission and emission process; the transformer is used for transforming voltage grade and is convenient for signal transmission and emission; the voltage detection circuit and the current detection circuit are used for realizing real-time detection of output voltage and current and provide real-time signals for the control circuit; and the control circuit is a central processing unit. According to the method for launching the marine controlled-source electromagnetic exploration system, disclosed by the invention, the signal transmission reliability of the system is improved, the requirement on the cable is reduced and the economic cost is reduced.

The invention provides a uniform-pressure electromagnetic forming device, a uniform-pressure coil and an obtaining method thereof. The uniform-pressure electromagnetic forming device comprises a conductive channel, a coil and a workpiece. The U-shaped conductive channel is formed in an upper-portion surrounding coil of the coil, the workpiece is arranged below the coil, and the workpiece and the conductive channel form a current loop. The coil comprises a lead, an epoxy plate and a reinforcing material. A framework composed of the epoxy plate provides supporting for the lead. The reinforcing material is arranged on the outer side of the lead to serve as an outer reinforcing layer and used for providing enough strength. During work, eddy current is sensed in the workpiece and the conductive channel due to the influence of changing current in the coils, and the current loop is formed. Due to the fact the coil is formed by winding multiple layers and turns of thinner red copper leads, an electromagnetic force exerted in the workpiece is large, and the forming efficiency is higher. For ensuring the strength of the coil, the reinforcing material is wound and reinforced in the coil lead winding direction and the winding direction perpendicular to the lead respectively, and high-strength and efficient uniform-pressure electromagnetic forming is achieved.

The present invention discloses a method for manufacturing a high-roughness electronic copper foil for a ceramic-based high-frequency plate. The method comprises the procedures of crude foil, first roughening, second roughening, first curing, second curing, third curing, blackening, galvanizing, passivation, coupling agent spraying and drying. The copper foil rough surface roughness of the crude foil process of the invention is greatly improved, the contact area of the copper foil rough surface and resin is greatly increased, the problem of low peel strength caused by poor resin mobility is solved, the uniformity of a rough surface copper tooth of the copper foil produced by the production process is good, the consistency is high, a skin effect caused by a large copper tooth fluctuation is reduced, and the loss in the signal transmission process is reduced.

Methods of hydraulic fracturing are disclosed. One method of hydraulic fracturing which is performed on a geologic stratum includes using a nano-proppant dominantly formed of particles having an average diameter of less than 1 μm dispersed in a fracturing fluid. A material for use in hydraulic fracturing may include a fracturing fluid and a nano-proppant dominantly formed of particles having an average diameter of less than 1 μm dispersed in the fracturing fluid.

According to the invention, an improved copper filling in the slots (4) of a permanently-stimulated synchronous motor (2) may be achieved, whereby such a motor is disclosed, comprising a stator (1), with parallel-edged slots (4), provided with a winding system of flat wires (5), whereby the flat wires (5) each enclose a tooth (3) and are embodied as a tooth coil (6). The flat wires (5) are wound edgewise such that the narrower side of the flat wire (5) faces the tooth (3) and each tooth coil (6) comprises at least two layers of flat wires (5).

The invention belongs to the field of light alloy machining, and particularly relates to a variable frequency ultrasonic semi-continuous casting method for magnesium alloy. The method comprises the steps of alloy smelting, melt delivery and consolidation forming under ultrasonic treatment. Magnesium alloy melt is treated in a real-time variable frequency ultrasonic field introduced in the semi-continuous casting process, and the quasi real-time tracking of the resonant frequency of metal melt is achieved; and liquid cave melt is subjected to the ultrasonic resonance treatment continuously in the whole semi-continuous casting process, so that the continuous ultrasonic high-efficiency treatment of the magnesium alloy melt is achieved in the solidification process. In the method provided by the invention, an ultrasonic radiation rod is extended into the magnesium alloy melt in the magnesium alloy semi-continuous casting process, so that the cavitation effect and acoustic streaming effect produced by the variable frequency ultrasonic field directly act on the magnesium alloy melt solidifying. With the method provided by the invention, the magnesium alloy solidification behavior can be changed obviously, the structure is refined, and the uniformity of the billet solidification structure as well as the mechanical property of magnesium alloy billets are improved; and the billet casting defects are reduced obviously, and the quality of the magnesium alloy billets is improved greatly.

The invention relates to a circular shielding insulating bus, which has the advantages of high carrying capacity, good heat dissipation, low temperature rise, strong electric insulation performance, no environmental disturbance and high reliability. The circular shielding insulating bus comprises a circular conductor and an outer layer sheath, wherein a plurality of insulating shielding layers are arranged between the circular conductor and the outer layer sheath and consist of insulating layers and shielding layers; each insulating layer comprises two polytetrafluoroethylene layers and a thermal shrinkage sheath from inside to outside; and silicone oil is uniformly brushed between the polytetrafluoroethylene and the thermal shrinkage sheath.