133 results about "Litz wire" patented technology

The invention relates to a litz wire processing technology and a squaring machine, and relates to the technical field of litz wire processing, and the litz wire processing technology comprises the following steps: S1, wire preparation; s2, manufacturing an enameled single wire; s3, bunching; s4, twisting is carried out; s5, squaring; s6, film covering and insulation treatment; and S7, forming. According to the litz wire processing technology, the squaring machine and the dust removal mechanism, the cleanliness of a stranded wire in the squaring process is effectively guaranteed, specifically, an annular pipe with a plurality of air outlet heads A and air outlet heads B and a dust falling pipe are arranged in the dust removal box, the air outlet heads can evenly blow out high-pressure air, dust and impurities on the surface of the stranded wire are effectively removed, and the dust removal efficiency is improved. In addition, the electrostatic generator and the electrostatic dust collection plate in the air inlet box can effectively prevent dust from flying, the dust removal effect is further enhanced, it is ensured that the surfaces of the stranded wires are clean, the quality of subsequent procedures is improved, meanwhile, the influence of dust on mechanical parts of the squaring machine is reduced, and the quality of the squaring machine is improved. And the service life of equipment is prolonged.

The invention relates to a Litz wire manufacturing process, and belongs to the technical field of electromagnetic wire manufacturing technologies, and the Litz wire manufacturing process comprises the following steps: S1, preparing a twisted wire core: enabling a plurality of insulated wires to form the wire core through a multi-level twisting process; s2, compression molding: adjusting parameters of a molding die according to the target section graph, enabling a die orifice of the molding die to be switched in a trapezoidal or rectangular manner, and performing square pressing treatment on the wire core to obtain a molded litz wire with a trapezoidal or rectangular section; and S3, insulation coating: carrying out insulation coating on the molded litz wire. According to the compression molding process, the trapezoidal or rectangular cross section is flexibly generated through the forming die, the requirement of special-shaped litz wire equipment for the customized cross section is met, the space adaptability of the litz wire is improved, and the problems that a traditional circular or single rectangular wire rod is low in groove fullness rate and high in eddy current loss are solved.

The invention relates to a semi-analytical calculation method for loss of a Litz wire winding of a high-frequency transformer, and the method comprises the steps: extracting equivalent electromagnetic parameters of a single-turn Litz wire through finite element simulation software, taking the equivalent electromagnetic parameters as the calculation premise of an AC resistance coefficient of a homogenized Litz wire winding, and accurately improving the calculation precision for a complex Litz wire winding. Compared with three-dimensional finite element simulation, the method has the advantages that calculation speed is increased and calculation power resources are saved while calculation precision is considered, so that calculation support is provided for prediction of winding loss in subsequent optimization design of the high-power high-frequency transformer; the technical problem that in the prior art, it is difficult to balance the balance between the calculation precision and the speed due to the complex multi-strand structure of the litz wire is solved.

The invention discloses an anti-offset wireless charging system magnetic coupling mechanism and an optimization design method. A transmitting end of the magnetic coupling mechanism adopts a coil of a bipolar reverse high anti-offset structure, and a receiving end adopts a circular plane spiral coil to reduce the weight of a vehicle-mounted end energy pickup mechanism; the transmitting end bipolar reverse high-anti-offset structure is formed by winding uninterrupted litz wires, an outer ring coil and an inner ring coil are located on the same plane and concentric, and the manufacturing directions are opposite, so that the bipolar reverse characteristic is formed. The transmitting end bipolar reverse high anti-offset structure coil also adopts an anti-offset particle swarm optimization design method considering receiving end plane movement mutual inductance smoothness and coil wire length, and under the condition of considering the transmitting end coil wire length, the magnetic field coupling uniformity in the 360-degree plane movement process of the receiving end is improved. The magnetic coupling mechanism provided by the invention has good anti-offset performance, and still has stable magnetic field coupling characteristics in a large-range moving process of a receiving end.

The invention belongs to the technical field of high-frequency electromagnetic devices, and particularly relates to a circular litz wire alternating current resistance coefficient optimization calculation method based on a winding shape, which comprises the following steps of: 1, fitting a winding external magnetic field analytical expression of a circular litz wire under a rectangular coordinate system according to the winding shape; 2, converting the winding external magnetic field analytical expression under the rectangular coordinate system into a cylindrical coordinate system for expression; 3, deriving an external proximity effect loss analytical expression of the single-turn circular litz wire by adopting a winding external magnetic field analytical expression under a cylindrical coordinate system; 4, deriving a winding alternating-current resistance coefficient analytical expression corresponding to the external proximity effect of the circular litz wire winding by adopting a single-turn circular litz wire external proximity effect loss analytical expression; and 5, superposing the alternating current resistance coefficient analytical expressions corresponding to the external proximity effect of the winding, the skin effect and the internal proximity effect to form an alternating current resistance coefficient analytical calculation improved formula of the circular litz wire winding.

The invention discloses a high-frequency transformer litz wire loss prediction method, and relates to the technical field of circuits, and the method comprises the steps: collecting an electromagnetic physical quantity, a structural physical quantity and a thermal physical quantity of a high-frequency transformer, so as to generate a multi-physical-quantity original feature set; carrying out litz wire equivalent copper foil conversion based on the multi-physical-quantity original feature set to obtain litz wire equivalent structure parameters; based on the litz wire equivalent structure parameters, determining three-dimensional magnetic field distribution of the litz wire, and decomposing the three-dimensional magnetic field distribution into a magnetic field component parallel to the strand and a magnetic field component perpendicular to the strand in combination with the litz wire torsion angle so as to generate a magnetic field component representation result; on the basis of the equivalent structure parameters of the Litz wire and the corresponding current harmonic characteristics, calculating the unit length loss of the Litz wire according to the magnetic field component characterization result so as to determine a basic loss value; and superposing the harmonic loss values to the basic loss value through the mutual impedance equivalent circuit of the litz wire to obtain the predicted loss value of the litz wire, thereby improving the loss prediction precision.

The invention relates to a power cable (20) comprising: - a hybrid conductor (21) comprising: a central portion (22) of the Litz wire type having a plurality of electrically conductive strands (23) electrically insulated from each other, a crown portion (25) having electrically conductive strands (26) not electrically insulated from each other, the thickness of the crown portion (25) being calculated to be less than or equal to a skin thickness (δ), and - an insulator (27) disposed around the hybrid conductor (21). Figure for abbreviation: Figure 5

The application provides a kind of equivalent Young's modulus determination method and device of secondary transposition Litz wire, and the method comprises the following steps: constructing the first parallel flexibility model of secondary transposition Litz wire along the length direction, the second series flexibility model and the second parallel flexibility model along the width direction and the third series flexibility model and the third parallel flexibility model along the thickness direction; determine the first equivalent Young's modulus of secondary transposition Litz wire along the length direction based on the first parallel flexibility model; determine the second equivalent Young's modulus of secondary transposition Litz wire along the width direction based on the second series flexibility model and the second parallel flexibility model; determine the third equivalent Young's modulus of secondary transposition Litz wire along the width direction based on the third series flexibility model and the third parallel flexibility model.The common influence of series force transmission and parallel force transmission on Young's modulus is closer to the actual structure, and the accuracy of mechanical simulation of secondary transposition Litz wire is improved.

The utility model discloses a Litz wire, a stator winding and a motor, and relates to the technical field of motors, the Litz wire comprises a plurality of strands of basic wires, the plurality of strands of basic wires are twisted into a whole, and each basic wire comprises a metal inner core, a graphene layer wrapping the metal inner core and an insulating layer wrapping the graphene layer; according to the technical scheme provided by the utility model, the technical effects of improving conductivity, reducing direct current loss, reducing heating, reducing skin effect and proximity effect under a high-frequency working condition, improving uniformity of current distribution, reducing alternating current loss and improving efficiency of the motor can be achieved.

The invention relates to the technical field of Litz wire processing equipment, in particular to a Litz wire surface covering film stripping device which comprises a fixing frame. The cutting mechanism is used for cutting the litz wire; the angle adjusting mechanism is used for adjusting the angle of the cutting mechanism; the waste treatment mechanism is used for treating accumulated waste; the angle adjusting mechanism is arranged on the fixing frame, the cutting mechanism is arranged on the angle adjusting mechanism, and the waste treatment mechanism is arranged on the fixing frame. The arranged cutter is matched with the shovel-shaped clamp at the front end, the cutter can accurately cut into a gap between a wire meter and a thin film, only an insulating film is cut without damaging an internal tiny enameled wire, meanwhile, the angle of the cutting mechanism can be adjusted through the angle adjusting mechanism according to the surface condition of the litz wire, and it is ensured that the cutter is always located at the optimal working position; and meanwhile, the key part of the cutter is wrapped by the clamp, so that the cutting effect is ensured, the scratch risk is reduced, and the potential safety hazard in the manual operation process is reduced.

Disclosed are a high power flux cancelling current steering inductor without a gap and processes of making and using same. When properly configured and wired such inductors, separate the AC component and DC component of a high power current thus allowing the smaller AC fraction of the overall current to be carried by much smaller cross-sectional litz wires. Such a high power flux cancelling current steering inductor without a gap are more efficient at avoiding core saturation compared to standard inductors, do not require core gaps, yet they are less expensive without the need for large cross-sectional litz AC carrying wires. In addition to the aforementioned benefits, such a high power flux cancelling current steering inductor without a gap permits the levels of AC and DC current to be efficiently monitored as such currents are separated.

A power transmitter for wireless power transfer includes a control and communications unit configured to provide power control signals to control a power level of a power signal configured for transmission to a power receiver and including a pulse width modulation (PWM) signal generator for determining and selecting the operating frequency from the operating frequency range. The power transmitter further includes an inverter circuit configured to receive a direct current (DC) power and convert the input power to a power signal, coil configured to transmit the power signal to a power receiver, the coil formed of wound Litz wire and including at least one layer, the coil defining, at least, a top face, and a shielding comprising a ferrite core and defining a cavity, the cavity configured such that the ferrite core substantially surrounds all but the top face of the coil.

The application relates to a detection instrument for measuring the bending force of a large-size Litz wire and a detection method thereof, and belongs to the technical field of Litz wire detection. The detection instrument comprises a detection table, an automatic wire feeding device for driving the Litz wire to feed along the x-axis direction, a center shaft assembly arranged on the detection table and used for fixing the bending center position of the sample wire, a fixed clamping assembly arranged on one side of the center shaft assembly, a bending assembly arranged on the other side of the center shaft assembly, a wire cutting device arranged between the fixed clamping assembly and the center shaft assembly and used for cutting the Litz wire into a plurality of sample wires, a force detection device used for detecting the stress data of the sample wire in the bending process in real time, and a control processing system in signal connection with the bending assembly and the force detection device. The application replaces the traditional visual inspection or hand feeling test by accurately quantifying the soft bending force of the Litz wire, improves the reliability and stability of the detection, and improves the automation degree of the detection and reduces the labor intensity.

The invention relates to a litz wire processing production process and a detection device thereof, and relates to the technical field of litz wire production, and the litz wire processing production process comprises the following steps: S1, wire preparation; s2, manufacturing an enameled single wire; s3, bunching; s4, twisting is carried out; s5, squaring; and S6, film covering and insulation treatment. According to the Litz wire processing production technology and the detection device thereof, the high-precision CCD camera and the automatic control detection device are introduced, the detection precision and efficiency of scratches and cracks on the surface of the copper wire are remarkably improved, compared with traditional manual detection and fixed-point monitoring equipment, the device can comprehensively detect the surface of the copper wire, personal errors are reduced, and the detection efficiency is improved. The production efficiency is improved, the product quality is ensured, impurities such as grease, dust and oxide possibly existing on the surface of the copper bar are removed through the cleaning assembly, the cleanliness of the surface of the copper wire is ensured through the step, the influence of the impurities on the adhesion performance of insulating paint is avoided, and therefore the uniformity and integrity of a paint film are ensured; and the cleaned copper bar is quickly and thoroughly dried.

The application provides an MCR-WPT system micro-plane coil structure parameter optimization method based on a kingfisher optimization algorithm, which comprises the following steps: analyzing a compensation structure network, deducing an energy transmission efficiency form of the MCR-WPT system; analyzing physical structure parameters in the micro-plane coil, calculating self-induction, mutual induction and alternating current resistance; calculating a theoretical self-induction value of the micro-plane coil; calculating a mutual induction coefficient value between the coupling coils; winding the coupling coils with Litz wires; calculating the alternating current resistance of the Litz wires under high-frequency alternating current; making the coils at the transmitting end and the receiving end have the same specifications and parameters; establishing a coupling coil structure optimization model; setting the upper and lower limits of the parameter variables; adding constraint conditions; taking the energy transmission efficiency as an optimization target of the objective function; and performing optimization calculation on the coupling coil structure optimization model by using the kingfisher optimization algorithm. The method has shorter average running time and faster operation speed.

Structures, apparatuses, and methods for wireless power transfer systems are described. The structure may include a plurality of strands arranged in a first coil layer and a second coil layer. The plurality of strands may be formed on parallel paths around a center of the structure. The plurality of strands may extend on the first coil layer away from the center. The plurality of strands may extend on the second coil layer toward the center. For each fixed interval along the length of the structure, a first strand of the plurality of strands may be rewound from the first coil layer to the second coil layer, and a second strand of the plurality of strands may be rewound from the second coil layer to the first coil layer.

The utility model discloses a high-coupling structure of a single-path transformer, which belongs to the technical field of power electronics and is characterized in that primary windings and secondary windings of the transformer are wound by enameled wires or Litz wires in a layered manner, and in each layer, the primary windings and the secondary windings are respectively wound on a magnetic core; a primary winding wire coil and a secondary winding wire coil which are formed after coiling are closely adjacent to each other up and down; one or more copper ring sheets are arranged between the layers; the primary windings between the adjacent layers adopt a parallel structure, the secondary windings between the adjacent layers adopt a parallel structure, and the primary windings and the secondary windings between the adjacent layers are alternately stacked. Compared with the prior art, the primary and the secondary are crossed and stacked in the scheme, so that not only can full coupling be realized, but also the peripheral size can be remarkably reduced. In addition, the copper ring sheets are smaller in size and occupied space, so that the transformer is more compact, the primary and secondary coupling degree is improved, the copper strips have better heat dissipation performance, the secondary temperature rise of the transformer can be effectively reduced, and the transformer is very suitable for a narrow space.

This invention relates to the field of power electronic transformer winding technology, and more particularly to a strip-shaped Litz wire for solid-state transformers and its preparation method. The strip-shaped conductive core is composed of multiple enameled copper single wires; and a composite insulating coating covers the outer surface of the strip-shaped conductive core. The composite insulating coating comprises a polyimide matrix and chopped silica fibers dispersed in the polyimide matrix, with zinc oxide quantum dots anchored on the surface of the chopped silica fibers. The advantages of this invention are that by anchoring zinc oxide quantum dots to the surface of the chopped silica fibers and dispersing them in the polyimide matrix, the quantum dots are uniformly dispersed, forming a nonlinear conductivity network, suppressing partial discharge initiation, and improving corona resistance lifetime. The chopped silica fibers form a rigid skeleton in the coating, improving mechanical strength. The chemical bonding between the quantum dots and the fiber surface enhances interfacial bonding, further improving mechanical properties. Simultaneously, this structure avoids insulation defects introduced by nanoparticle aggregation, maintaining a high breakdown field strength and partial discharge initiation voltage.

The invention discloses lifting equipment for crown block maintenance, which is mounted on a hoisting mechanism of a ceiling, and comprises a fixed frame connected to the hoisting mechanism; the movable track assembly can be movably connected to the fixed frame; the first driving mechanism is arranged on the fixed frame, and the first driving mechanism drives the movable track assembly to ascend and descend; the locking assembly is connected to the hoisting mechanism or the fixed frame, and when the movable track assembly ascends to a preset position, the locking assembly locks the movable track assembly at the preset position; and the second driving mechanism is arranged on the fixed frame, the second driving mechanism drives the first electric wire mounting plate to extend to the position below the movable track assembly and retract, and the first electric wire mounting plate is provided with a first litz wire. The lifting equipment does not occupy a ground channel, the space utilization rate and the average area output value of a factory are increased, and the manufacturing cost and the installation cost are lower.

The invention discloses a multi-strand litz wire beam splitting compensation method for a wireless power transmission system, and belongs to the technical field of wireless power transmission. The invention aims to solve the problem of non-uniform current distribution caused by unequal inter-beam coupling coefficients of multiple strands of litz wires in electric energy transmission. Comprising the following steps: connecting a compensation capacitor in series on each beam of Litz wire branch of a primary side coil and a secondary side coil of the loosely coupled transformer to obtain compensated branches, and then connecting all the compensated branches in parallel; and the compensation capacitance value of each compensation capacitor is selected, so that branch currents after compensation of all primary sides are equal, branch currents after compensation of all secondary sides are equal, and current sharing of each beam is realized. The Litz wire loss compensation method is used for Litz wire loss compensation.

The utility model discloses a low-temperature-rise inductor, which belongs to the technical field of inductors and comprises a magnetic core, a wire body and a shell, the inductor is novel in design and ingenious in device, heat can be conducted and dissipated more effectively by introducing high-heat-conductivity materials into the magnetic core and the wire body, the magnetic core and the wire body are made of high-heat-conductivity copper alloy materials, the temperature rise of the inductor is reduced, the wire body adopts the flat winding or Litz wire winding design, the surface area of the winding is increased, the heat dissipation efficiency of the winding is improved, and the service life of the inductor is prolonged. The flat winding and the Litz wire can reduce the skin effect and the proximity effect and reduce alternating current resistance, so that heating is reduced, a special heat dissipation channel is designed in the inductor, it is ensured that heat can be rapidly conducted to the outside, the heat dissipation channel can effectively guide heat to flow, heat is prevented from being accumulated in the inductor, and therefore the heat dissipation effect of the inductor is improved. By improving materials and structural design, the low-temperature-rise inductor can effectively reduce temperature rise under the high-current condition, and the overall performance and reliability are improved.

The invention provides a wire structure based on a filler and a multi-stranded litz wire and a preparation method, and belongs to the technical field of megahertz power electronics. The preparation method of the wire rod structure based on the filler and the multi-stranded litz wire comprises the following steps: S1, determining an optimized arrangement mode in wire rod multi-stranding; s2, twisting the fine copper wires and coating the fine copper wires with a filler to obtain a primary structure wire; s3, according to the optimized arrangement mode, determined in the step S1, in the wire compound stranding process, multi-stage stranding is repeated on the upper-stage structural wire, and filler is added until the optimized arrangement mode, determined in the step S1, in the wire compound stranding process is met; the repeated multi-stage twisting includes at least two-stage twisting of the primary structural wires. According to the invention, the distance between the thin copper wires in the wire is increased through the filler, so that the megahertz frequency band alternating current loss of the obtained litz wire is reduced; by optimizing the arrangement of the internal structure of the wire rod, the proximity effect and skin effect of high frequency in the wire rod are inhibited, and the loss of the obtained litz wire is reduced.

The application discloses a kind of litz wire winding intelligent design optimization methods, and the litz wire winding ac resistance and porosity are obtained by neural network and hfss, the model of litz wire winding is constructed using hfss simulation software to simulate the ac resistance of litz wire winding under different materials, different number of turns, different litz wire winding radius and different frequency, to complete the training data and test data used to litz wire winding neural network model. Manual grid division is used to simplify the solving steps and time, and the accuracy is ensured. The litz wire winding neural network model is used to automatically train and test using particle swarm optimization algorithm to improve the network model, and finally the litz wire winding neural network model can quickly and accurately obtain the required litz wire winding ac resistance. The application can be used to quickly and accurately obtain the litz wire winding ac resistance under different requirements, reduce the amount of calculation and working time, greatly improve the efficiency.

A dual helmet magnetoencephalography measuring device includes: an inner container storing a liquid refrigerant; an outer container arranged to surround the inner container and comprising a first outer helmet and a second outer helmet arranged to be spaced apart from each other; a first sensor-mounted helmet disposed around the first outer helmet between the outer container and the inner container; a second sensor-mounted helmet disposed around a second outer helmet between the outer container and the inner container; a plurality of first SQUID sensor modules arranged on the first helmet on which the sensor is mounted; and a plurality of second SQUID sensor modules disposed on the second sensor-mounted helmet, a space between the outer container and the inner container being in a vacuum state, the first SQUID sensor module being cooled by a plurality of Litz wires, a portion of the plurality of Litz wires disposed around the first SQUID sensor module being connected to the first SQUID sensor module, and a portion of the plurality of Litz wires disposed around the second SQUID sensor module. And the remaining portions of the plurality of Litz wires are in thermal contact with the main thermal anchor.

The invention relates to a multi-stage gradual change type squaring forming device and technology, and belongs to the technical field of wire rod forming, the forming device comprises a first-position squaring die and a last-position squaring die, the cross section of a die opening of the first-position squaring die is oval, the cross section of a die opening of the last-position squaring die is rectangular, and the first-position squaring die and the last-position squaring die are sequentially connected. The first-position squaring die and the last-position squaring die are sequentially arranged in the row line direction. Through the arrangement of the first-position squaring die and the last-position squaring die, traditional single-time squaring is decomposed into at least two-stage progressive deformation. A round wire is pressed into an oval section through the first square pressing die, the last square pressing die carries out final pressing on the oval section wire to form a target rectangular section, and the risk of instantaneous tensile fracture of an insulating layer is reduced. Especially for a target rectangular cross section with a high length-width ratio, the bending stress of the corners is dispersed through multi-stage deformation, and the litz wire twisting structure is prevented from being loosened and disintegrated. Meanwhile, the forming device is arranged along the line direction, is compact in structure, and is compatible with the existing stranding production line layout.

The invention relates to the field of wireless power transmission, provides a wireless power supply system and a wireless power supply method for a train windshield monitoring system, and aims to solve the problem of unstable power supply caused by position deviation of a coupling mechanism of the wireless power supply system due to train operation vibration and windshield deformation. The high-frequency inverter circuit is configured to convert direct current into high-frequency alternating current and output square-wave voltage through a full-bridge inverter circuit topology; the magnetic coupling mechanism comprises a transmitting coil and a receiving coil, is attached to the two sides of rubber shed cloth of a train windshield, adopts a square coil structure and is wound by a litz wire to reduce high-frequency skin effect loss; the compensation network adopts an LCC-S type compensation topology, forms resonance with the magnetic coupling mechanism, provides constant voltage output and adapts to a vibration environment; the rectifier is configured to convert the alternating current induced by the receiving coil into direct current so as to supply power to a monitoring sensor load in the windshield; and the flexible soft magnetic sheets serve as magnetic shielding structures and are arranged on the two sides of the transmitting coil and the receiving coil.

The utility model relates to the technical field of cables, and discloses a multilayer film-coated high-frequency litz wire, which comprises a protective layer, a wire body is arranged in the protective layer, the outer wall of the wire body is fixedly connected with a primary insulating layer, the outer wall of the primary insulating layer is fixedly connected with a thermal stability layer, and the outer wall of the thermal stability layer is fixedly connected with a shielding layer. The outer wall of the shielding layer is fixedly connected with a first protection layer, a core body is arranged in the wire body, the outer wall of the core body is fixedly connected with an anti-impact layer, and the outer wall of the anti-impact layer is fixedly connected with a heat conduction layer. According to the utility model, the protection layer comprises the first protection layer, the shielding layer, the thermal stability layer and the primary insulation layer, the primary insulation layer is made of polyester, basic electrical insulation is provided, mutual current interference among different conductors is prevented, the effect of improving heat dissipation of the litz wire is achieved, and the problems that a traditional litz wire in high-frequency and high-power equipment is large in heat dissipation requirement and poor in heat dissipation performance are solved. Therefore, the heat dissipation performance of the high-frequency litz wire is improved.

The utility model discloses a litz wire single-layer insulation twisting forming jig, which comprises a wire inlet part, a transition part and a forming part, the transition part is positioned between the wire inlet part and the forming part, the wire inlet part is used for guiding a plurality of wires to enter, a first guide part is arranged between the wire inlet part and the transition part, and a second guide part is arranged between the transition part and the forming part. A first guide part is arranged between the wire inlet part and the forming part, the first guide part is used for guiding a wire to enter the transition part from the wire inlet part, a second guide part is arranged between the transition part and the forming part, the second guide part is used for guiding the wire to enter the forming part, and the forming part is used for twisting the wire into a rectangular conductor; according to the Litz wire single-layer insulation twisting forming jig, the first guide part and the transition part are adopted, multiple bundles of insulation wires can be rapidly guided and formed into an oval conductor, and the oval conductor is formed into a rectangular conductor in cooperation with the second guide part and the forming part.

A magnetic component 1 according to one aspect of the present invention includes: a magnetic core 10 which has at least one pair of opposing legs (middle legs 12) and in which a first gap L1 is formed by the pair of legs (middle legs 12); and a winding 20 that is wound around the pair of legs (middle legs 12) along a direction in which the pair of legs (middle legs 12) extend, and is also multiwound so as to overlap in a direction substantially perpendicular to the direction of extending. In a region surrounding at least the first gap L1, the winding 20 is made of a magnetic plated Litz wire in which a plurality of single strands are bundled, and the frequency of drive conditions is 200 kHz or higher, and therefore copper loss at high frequencies can be sufficiently suppressed even when the magnetic plated Litz wire is wound around a core provided with a gap.

The invention relates to the technical field of electrical parts, in particular to a litz wire, and the litz wire comprises a plurality of circuit layers which are arranged layer by layer; the circuit layer comprises an insulating main body and a conductor, and the conductor is arranged on the insulating main body; the electric conductor comprises a plurality of electric leads which are arranged at intervals; the conductors of two adjacent circuit layers are electrically connected; the top layer is arranged on the first circuit layer; and the bottom layer is arranged on the last circuit layer. According to the Litz wire provided by the invention, the winding is etched on the insulating main body through the etching process, so that the copper consumption is reduced, the overall weight of the Litz wire is greatly reduced, additional wiring or welding is not needed, the fixing step is reduced, and the overall weight and size are further reduced; the integrated design of the electric conductor and the insulating main body enables the cable to have better mechanical resistance, and can meet the reliability requirements of strict scenes such as a vehicle gauge grade and an industrial grade.