106 results about "Circular coil" patented technology

Embodiments of this application provide an electronic device component. A first charging coil and a second charging coil are respectively disposed in a wireless keyboard and a stylus. At least one of the first charging coil and the second charging coil is a circle coil, and the circle coil is disposed around circumference of an accommodating portion or the stylus. The stylus can be charged when the stylus is blindly inserted into the accommodating portion, to resolve a prior-art problem that a user cannot quickly charge the stylus because the charging coils need to be aligned for a plurality of times when the stylus is charged.

The invention relates to the technical field of transformers, and particularly discloses a small-size and strong-short-circuit-current-resistant transformer, which comprises a transformer body, the transformer body comprises an iron core, a plurality of iron cores, a plurality of short-circuit-current-resistant coils, a plurality of short-circuit-current-resistant coils and a plurality of short-circuit-current-resistant coils, the insulating cylinder is arranged on the outer side of the core column in a sleeving manner; the winding sleeves the outer side of the insulating cylinder, the winding comprises a circular coil wound on the outer wall of the insulating cylinder and a plurality of layers of elliptical coils wound on the outer side of the circular coil, and the trend of the elliptical coils is parallel to magnetic lines generated by the circular coil; heat dissipation channels parallel to the axis of the core column are formed between the circular coils and the oval coils and between every two adjacent oval coils. The space of the core column can be effectively utilized, the elliptical ring can fill the external space, the magnetic field trend of the outer elliptical coil is parallel to that of the inner circular coil, high-frequency loss caused by the proximity effect and eddy-current loss during short circuit can be effectively reduced, and the normal operation efficiency and short-circuit endurance capacity of the transformer are improved.

The invention provides an anti-offset magnetic coupling mechanism for a wireless charging system of an unmanned aerial vehicle, the magnetic coupling mechanism comprises a transmitting end arranged on a landing platform and a receiving end mounted on the unmanned aerial vehicle, and a transmitting coil is a double-layer circular coil wound at gradient intervals; an axial magnetic field which is uniformly distributed is formed through a non-uniform distribution structure of coil turn spacing; the receiving end is composed of four sets of same magnetic core-coil structures, each set is composed of a lightweight cylindrical novel soft magnetic composite material magnetic core and an externally-wound solenoid coil of a vertical landing gear of the unmanned aerial vehicle, the magnetic cores are located in the vertical landing gear of the unmanned aerial vehicle, and the coils of the four magnetic core-coil structures are closely wound in the axial direction of the outer surface of the landing gear and connected in series. And coil and magnetic core parameters are designed by using an evolutionary algorithm. The problems that in a traditional scheme, the anti-offset capacity is weak, the magnetic core weight is large, and the receiving end is not matched with the special-shaped structure of the unmanned aerial vehicle are solved, and the method is suitable for unmanned aerial vehicle wireless charging scenes.

The invention provides a circular anti-offset coupling mechanism and a wireless power transmission system formed by the same. The problem that an anti-offset structure and a control strategy of an existing circular coil coupling mechanism are complex is solved. The circular anti-offset coupling mechanism comprises a transmitting end and a receiving end, the transmitting end comprises a first transmitting coil L1 and a second transmitting coil L2, and the receiving end comprises a first receiving coil L3 and a second receiving coil L4; the first transmitting coil L1 and the first receiving coil L3 are planar circular coils, the second transmitting coil L2 and the second receiving coil L4 are composite planar circular coils formed by winding a lead, each composite planar circular coil comprises four fan-shaped areas, and the winding directions of the leads in the adjacent fan-shaped areas are opposite. The transmitting end and the receiving end both comprise the planar circular coil and the composite planar circular coil, so that the system can achieve the anti-offset effect in the X, Y and Z directions, and it is ensured that the system can achieve stable output when offset occurs.

The utility model relates to a novel special offshore dry-type transformer which is better in using effect and good in heat dissipation effect when being used on the sea, and an iron core in a dry-type transformer body is composed of an upper iron yoke, a lower iron yoke and three iron core columns. The three iron core columns are respectively sleeved with a high-voltage coil group and a low-voltage coil group, low-voltage coils in the high-voltage coil group and the low-voltage coil group are located in high-voltage coils, the iron core columns are circular columns, the low-voltage coils are circular coils, and twelve supporting strips are vertically arranged between the outer wall surfaces of the iron core columns and the inner wall surfaces of the low-voltage coils and are distributed at equal intervals. The novel offshore special dry-type transformer has the advantages that the low-voltage coil and the iron core column are designed to be in a regular circle shape, and the 12-equal-part tight supporting structure is adopted between the low-voltage coil and the iron core column, so that the stress of the low-voltage coil and the iron core column which are tightly supported by the twelve supporting strips is more uniform, the anti-seismic performance of the dry-type transformer body can be improved, and the service life of the dry-type transformer body is prolonged; therefore, the using effect of the dry-type transformer used on the sea is improved.

To provide a vibration sensor unit, a rotary electric machine and a pump device that can be used within a wide temperature range and are less likely to cause a failure due to vibration.SOLUTION: A vibration sensor unit 5 includes: a conductor 7 which has at least one coil part 70 wound in a circular coil shape; a body part 6 which is made of a magnetic material and positioned so as to be in contact with the inside of the coil part; a power supply 81 which supplies a constant current to the coil part; and a vibration detection part 822 which detects vibration on the basis of a change in the AC component of the voltage generated in the conductor. A rotating shaft has a cylindrical outer peripheral surface 322. The body part has an annular shape to which the rotating shaft can be inserted or has a shape in which a portion of the annular shape is cut out along a circumferential direction of the coil part. When the rotating shaft is arranged inside the body part so as to rotate in the circumferential direction of the coil part, a portion of the rotating shaft arranged inside the body part is made of a conductive or magnetic material. An inner peripheral surface 61 of the body part is arranged with a gap from the outer peripheral surface of the rotating shaft.SELECTED DRAWING: Figure 2

A hydraulic motor pump unit for pressurising a hydraulic fluid in a hydraulic circuit. The motor pump unit includes a motor having a motor stator holding a circular array of coils and a motor rotor having a motor rotor body having an outer circumferential rotor surface holding a circular array of magnets. The motor rotor body is positioned within the motor stator holding the magnets opposite the coils. A pump is drivable connected to the motor rotor. A housing body provided with a pump chamber for housing the pump and a cylindrically shaped coil support for supporting the circular array of coils. The housing comprises at least one housing end cap which is connected to the coil support which housing end cap is provided with a fin pattern for an air cooling of the housing to an environment.

The invention relates to a rapid calculation method and system for a space magnetic field of a circular coil. The method comprises the following steps: converting an integral expression of a Biot-Savart law into a closed analytical solution containing first and second types of complete elliptic integrals; on the basis of an analytical expression of elliptic integration, the magnetic field intensity and direction generated by the coil at any point in the space can be efficiently and precisely calculated, and the defects that traditional finite element simulation calculation is complex, consumed time is too long, and efficiency and precision of a direct numerical integration method are difficult to consider at the same time are overcome. The method is particularly suitable for application scenes such as WPT system design, multi-transmitting-coil amplitude-phase control optimization and real-time simulation which need to carry out rapid and frequent calculation on the magnetic field. According to the method, full-automatic rapid calculation from physical parameter input to magnetic field result output is achieved, the core advantage of the method is that an analytical formula is utilized, the tedious process of numerical simulation and integration is avoided, and the calculation efficiency is remarkably improved while high precision is guaranteed.

The utility model discloses a circular coil winding, peeling and tin soldering processing device which comprises a winding processing section and a tin soldering processing section. The winding processing section sequentially comprises a feeding mechanism, a wire feeding mechanism, a straightening mechanism, a wire stripping mechanism, a winding mechanism and a wire cutting mechanism according to a processing flow; the tin soldering processing section sequentially comprises a soldering flux furnace, a tin material furnace and a discharging device according to the processing flow; the tin soldering and material transferring mechanism is used for achieving material transferring machining work, and the machining range of the tin soldering and material transferring mechanism extends from the discharging position of the wire cutting mechanism of the winding machining section to the feeding position of the discharging device. The integrated processing flow of coil stripping, winding and tin soldering is realized, the effect of integrated flow processing is realized, and the production efficiency and the productivity can be effectively improved; and moreover, the processing precision of automatically processed coil winding and wire leg soldering tin is higher, the quality of processed and formed products is better, and the convenient, efficient and high-quality processing requirements of enterprises in large-scale production are better met.

The invention discloses a comprehensive tester of multiple magnetic fields based on Arduino. The Arduino single-chip microcomputer, a Hall sensor and other devices are adopted to develop a comprehensive experimental instrument capable of measuring multiple magnetic fields. Based on the understanding of different magnetic field measurement methods and the integration of relevant experimental equipment, the measurement experiments of a constant magnetic field, an alternating magnetic field and a geomagnetic field are combined to reflect the difference among the constant magnetic field, the alternating magnetic field and the geomagnetic field in electromagnetic effects, measure the size and direction of the magnetic field, and help students recognize and understand the distribution of the magnetic fields of a current-carrying circular coil and a Helmholtz coil, as well as the size of the component of the geomagnetic field parallel to the ground.

The utility model relates to an air-cooled electromagnetic stirrer inductor for an aluminum melting furnace, which comprises an inductor body, an air duct device is arranged at the bottom of the inductor body, and the inductor body is covered by a ventilated frame; the inductor body comprises a pressing plate and N ring-shaped coils, and all the coils are regularly arranged in a line; each coil encloses a corresponding silicon steel sheet unit; each silicon steel sheet unit comprises a plurality of silicon steel sheets which are arranged at intervals and arranged in a row, and a partition plate is arranged between every two adjacent silicon steel sheets. The silicon steel sheet units and the pressing plates are connected through a plurality of screw rods which transversely penetrate through the silicon steel sheet units and the pressing plates; ngt; = 2. The product is simple in structure and convenient to operate, does not need a cooling water system, cools the inductor body through blowing of the fan, omits a complex cooling water system, and is energy-saving and consumption-reducing.

The invention discloses a multifunctional magnetic field and Ampere force measurement comprehensive experimental instrument, including a base, an electronic scale bracket fixedly arranged at the left end of the upper end surface of the base, an electronic scale fixedly arranged at the upper end of the electronic scale bracket, a square wire frame arranged at the upper end of the electronic scale pan, a square wire frame bracket arranged in the middle of the square wire frame, a square wire frame plane nail fixedly arranged at the left end of the square wire frame, a current-carrying circular coil, a Hall sensor and a Hall sensor lead connector fixedly arranged at the left and right ends of the square wire frame, a radial slide arranged at the lower end of the Hall sensor lead connector, a radial rotating drum wheel and a radial guide rail arranged at the lower end of the radial slide, and a transverse slide arranged at the lower end of the radial guide rail. The above technical scheme combines the measurement experiments of constant magnetic field and alternating magnetic field, reflects the difference between constant magnetic field and alternating magnetic field in electromagnetic effect, helps students recognize and understand the magnetic field distribution of current-carrying circular coil and Helmholtz coil, has reasonable structural design, is easy to use, and has good inventiveness.

Wireless power transmission coupling mechanism on high-voltage line insulators and manufacturing method thereof. The main body of the mechanism includes a transmitting end and a receiving end; both the transmitting end and the receiving end include a spiral circular coil and a magnetic core; wherein, the magnetic core is composed of uniformly distributed support frames and magnetic core rings with the same spacing, and the height of each is the same as the height of the coil; the inner side of the smallest magnetic core ring is fixed on the insulator fitting, and the outer side of the largest magnetic core ring is closely attached to the inner wall of the coil; the optimal number of support frames and magnetic core rings is selected according to the simulation results; it is verified that the addition of this coupling mechanism will not damage the insulation performance of the high-voltage transmission line. The invention is applied to a wireless power transmission system for spanning the insulator distance on a high-voltage line, the coils can be fixed at both ends of the insulator, and at the same time, the mutual inductance of the coils is significantly increased, effectively improving the transmission performance of the system.

The invention discloses a winding method of a wire for a valve reactor, and provides a winding device and a winding coil pattern. The winding device comprises a winding base, a winding tower block, a winding wheel assembly and a block-up block, and the winding base comprises a winding base body, a winding station and a limiting hole. And each winding station is provided with a limiting hole. And each winding tower block comprises a winding tower block main body and an insertion hole. The winding wheel assembly comprises a winding frame, a winding shaft and a winding wheel. And the plurality of limiting holes are respectively formed in each corner position of a wound coil pattern. According to the winding method of the wire for the valve reactor, a winding tower block is arranged at each corner of a non-circular coil, each winding tower block is independent, the height of each winding tower block is superposed according to the number of winding turns, all towers do not interfere with each other in the winding process, the winding method is suitable for winding non-circular coils of different shapes, the quality stability of the coils is guaranteed, and the winding efficiency is improved. The labor intensity of workers is reduced, and the machining efficiency is improved.

The application discloses a composite diamagnetic coil for a magnetic confinement fusion device and a system thereof. The composite diamagnetic coil uses the core and the skin of a coaxial coil as a concentric circular coil and a compensation coil respectively, so that the measurement positions of the two sets of coils are consistent, and the concentric circular signal is compensated by the compensation coil, thereby reducing the measurement error while reducing the workload of eddy current compensation.

A system and a method for voltage-controlled oscillator (VCO are disclosed. A first VCO core includes a first cross-coupled (CC) transistor pair having a first conductivity type and a second cross-coupled transistor pair having a second conductivity type. A second VCO core includes a third CC transistor pair having the first conductivity type and a fourth CC transistor pair having the second conductivity type. A first synchronization trace connects the first CC transistor pair to the third CC transistor pair. A second synchronization trace connects the second CC transistor pair to the fourth CC transistor pair. The first and second VCO cores are arranged on a circular path on a substrate and disposed opposite with each other with respect to a center of the circular path.

The utility model discloses a stack guide vehicle with a stack coil clamp, which comprises the stack coil clamp and an AGV body, the stack coil clamp comprises a stack coil material taking assembly, a stack coil support and a stack coil driving assembly, and the stack coil material taking assembly is connected with the stack coil driving assembly; the stacking and rolling driving assembly and the stacking and rolling material taking assembly are assembled on the stacking and rolling support, and the stacking and rolling support is connected with the AGV body. The guiding vehicle can flexibly adapt to automatic carrying and stacking of circular coil stocks of different specifications, so that the problems that in the prior art, in the automatic carrying and stacking process of the circular coil stocks, flexibility and adaptability are lacked, materials of irregular shapes and variable sizes cannot be efficiently treated, and the working efficiency is high are solved. And the accuracy and the automation level are low.

A system and a method for voltage-controlled oscillator (VCO are disclosed. A first VCO core includes a first cross-coupled (CC) transistor pair having a first conductivity type and a second cross-coupled transistor pair having a second conductivity type. A second VCO core includes a third CC transistor pair having the first conductivity type and a fourth CC transistor pair having the second conductivity type. A first synchronization trace connects the first CC transistor pair to the third CC transistor pair. A second synchronization trace connects the second CC transistor pair to the fourth CC transistor pair. The first and second VCO cores are arranged on a circular path on a substrate and disposed opposite with each other with respect to a center of the circular path.

The utility model relates to a crankshaft scanning inductor capable of improving quenching uniformity, which comprises a first arc coil, a second arc coil and a third arc coil, and the three arc coils form a circular coil; the first arc-shaped coil is of a semicircular structure, the two ends of the first arc-shaped coil are connecting ends, and the middle is connected with a first water inlet pipe. The upper end of the second arc-shaped coil is a connecting part, and the lower end is connected with a second water inlet pipe; the upper end of the third arc-shaped coil is a connecting part, and the lower end is connected with a third water inlet pipe; the first arc-shaped coil is further connected with two fourth water inlet pipes, and the two fourth water inlet pipes are located on the two sides of the first water inlet pipe correspondingly; the second arc-shaped coil is further connected with a fifth water inlet pipe, and the third arc-shaped coil is further connected with a sixth water inlet pipe. The water feeding distance is shortened by additionally arranging the water inlet, the spray quenching process is completed while heating is conducted, meanwhile, the effective ring is cooled, and the continuous machining requirement is met.

The invention discloses a transcranial magnetic stimulation coil with a three-dimensional structure and a transcranial magnetic stimulation array, is applied to the technical field of transcranial magnetic stimulation, and aims to solve the problem that the influence of eccentricity on coil performance is not considered in the prior art. The invention provides an eccentric inverted-cone-shaped three-dimensional structure coil. The inverted-cone-shaped coil is formed by stacking a plurality of layers of circular coils with certain inclination angles and different specifications in the vertical direction. The radiuses of the coils in each layer are sequentially increased from bottom to top, the central axes of the coils in each layer are not aligned and have horizontal offset, the central axes of all the coils incline along the horizontal axis, and the inclination angles are the same; the effects that the coil has a small projection area on the scalp surface and has good focusing capacity and stimulation depth can be achieved.

The present invention discloses a pipe welding device, which relates to the field of welding devices and includes a base, on which two side plates are mounted via a slide, and work plates are rotatably mounted on the tops of the two side plates. The sides of the two work plates that are close to each other pass through a rotating shaft. When the two side plates are close to each other, the work plates form a V-shaped structure under their own gravity. The upper sides of the two work plates are each provided with a groove, and a semi-cylindrical ring is mounted inside the groove. A semi-circular coil is mounted inside the semi-cylindrical ring. The two semi-cylindrical rings can be snapped together to form a complete cylindrical ring. The semi-circular coils are combined into a complete coil structure, which can generate an eddy current magnetic field when energized. When welding a pipe, the present invention can directly heat the weld of the pipe, thereby improving the firmness of the weld. When in use, the semi-cylindrical rings only need to be spliced ​​into a cylindrical ring to achieve heating of the pipe. The use is very convenient, and the semi-cylindrical rings can be used alone to meet different usage conditions.

The utility model relates to a kind of long circular coil straightening tool in coil straightening technical field, including bearing table, X-axis straightening assembly and Y-axis straightening assembly, the bearing table middle part is equipped with the X-axis let room slot that passes through up and down and the Y-axis let room slot that passes through up and down, the X-axis let room slot is equipped with two along Y-axis let room slot symmetry;The straightening assembly includes slide rail, the slide rail each section has a pair of synchronous and opposite moving direction shaping part, and a pair of shaping part is connected with movable pad by elastic member, to support the area of coil corresponding let room slot;The utility model is equipped with X-axis straightening assembly and Y-axis straightening assembly, and the shaping part of a pair of synchronous opposite moving direction driven by combination bidirectional screw rod, the inner ring and outer ring of coil can be synchronously pressed and straightened;Effectively solve the problem that coil inner ring cannot be shaped in prior art, avoid coil installation difficulty caused by inner ring warping, wrinkle or protrusion.

A wire winding device for valve reactors includes a winding base, winding tower blocks, a winding wheel assembly, and a shim block. The winding base includes a main body, winding stations, and positioning mounting holes. Each winding station has a positioning mounting hole. Each winding tower block includes a main body, a insertion hole, and a winding groove. The winding wheel assembly includes a winding frame, a winding shaft, and a winding wheel. This wire winding device for valve reactors sets a winding tower block at each corner of a non-circular coil. Each winding tower block is independent, and its height is stacked according to the number of winding turns. During the winding process, each tower block does not interfere with the others. It is suitable for winding non-circular coils of different shapes, ensures the quality stability of the coil, reduces the labor intensity of workers, and improves processing efficiency.

The utility model discloses a heating device of a steam pipeline for carbon fiber production, which comprises a steam pipeline, a first induction coil is wound on the outer side of the steam pipeline, and an annular gap is formed between a circular coil wound by the first induction coil and the outer wall of the steam pipeline. A plurality of supporting strips are arranged in the annular gap in the axial direction of the steam pipeline and fix and support the first induction coil on the outer side of the steam pipeline. The wire inlet and outlet end of the first induction coil is connected with a controller, and the controller controls the current of the coil so as to control the intensity of electromagnetic heating. According to the utility model, condensed water in water vapor can be removed, the steam drafting effect of protofilaments is improved, the quality of carbon fibers is ensured, the temperature of the steam can be ensured, and the steam is saved.

This electromagnetic device comprises: an annular coil bobbin; and a core provided with an annular accommodation part in which the coil bobbin is accommodated. The inner circumferential surface of a trunk section of the coil bobbin is provided with a first engagement part. The outer circumferential surface of a central protrusion that demarcates the accommodation part is provided with a first locking part that locks the first engagement part.

The application relates to a high-offset-tolerance unmanned aerial vehicle wireless charging coupling mechanism and an optimization method, and belongs to the technical field of high-offset-tolerance unmanned aerial vehicle wireless charging. The mechanism comprises a compensation coil and a composite circular coil, the compensation coil and the composite circular coil are connected in series to form a single-current loop, the composite circular coil comprises a large circular coil and a small circular coil, and the large circular coil and the small circular coil are connected in series in the same direction. Through the mutual complementation mechanism of the magnetic flux change increase and decrease of the strong magnetic field characteristics of the edge of the compensation coil and the strong magnetic field characteristics of the center of the double circular coil, the mutual inductance fluctuation rate is less than or equal to 5% under the offset working condition of the receiving end, the traditional scheme is greater than or equal to 25%, the effective offset tolerance is increased to 35% of the diameter of the transmitting end, that is, 140mm / Phi400mm, which is 2.1 times larger than the traditional single-polarity structure; the structure breaks through the magnetic field distribution limitation of "strong center and weak edge", and solves the power stability fluctuation problem caused by horizontal offset.

The present application discloses a method and apparatus for generating a coil model. The method includes: constructing a second coil and a third coil; cutting the second coil perpendicular to the direction of current flow to obtain a third section and a fourth section of the second coil; cutting the third coil perpendicular to the direction of current flow to obtain a fifth section and a sixth section of the third coil; connecting the third section and the fifth section; and connecting the fourth section and the sixth section to obtain a coil model. The coil model is used to infer the electromagnetic force of a magnetic levitation system. By connecting the sections of the second coil and the third coil, respectively, the complex "8" coil structure in an actual magnetic levitation system is simulated using two basic circular coils. This results in a more accurate and faster calculation of the electromagnetic force of the magnetic levitation system derived from the coil model.

The invention discloses a wood fiber micro-nano crushing device magnetically driven by a uniform magnetic field gradient composite coil, a control method and a design method, the wood fiber micro-nano crushing device comprises a combined coil unit, and the combined coil unit is arranged on a motion track where a magnetic ball moves. The combined coil unit is formed by sequentially connecting leads of a conical coil, a circular coil and a square coil in series; the small end part of the conical coil faces the circular coil, and the wire winding directions of the conical coil and the circular coil are the same; the wire winding directions of the square coil, the conical coil and the circular coil are opposite. The magnetic field distribution of the combined coil is different from the concentrated distribution of the middle magnetic field of the traditional circular coil, so that the magnetic field intensities at different radial positions along the axial direction can be uniformly increased, the uniformity of the magnetic field gradient is ensured, and the magnetic balls at different positions are uniformly stressed; and the energy loss caused by collision among the particles is greatly reduced.

The present invention discloses an overlapping stimulation coil assembly and system for bioelectromagnetic stimulation, which relates to the field of bioelectromagnetic stimulation technology. The assembly includes a lower stimulation coil and an upper stimulation coil for vertical placement above a bioelectromagnetic stimulation target area, wherein the upper and lower stimulation coils have the same and similar geometric structure of a semicircular coil structure, the upper and lower stimulation coils are arranged overlappingly, and the arc portion of the lower stimulation coil, the arc portion of the upper stimulation coil, the straight long axis portion of the lower stimulation coil, and the straight long axis portion of the upper stimulation coil are arranged in sequence from bottom to top, and the upper and lower stimulation coils are used to respectively access excitation currents through different discharge circuits to jointly exert bioelectromagnetic stimulation on the target area. In this way, while ensuring that the stimulation intensity reaches the stimulation threshold, the focusing of the stimulation coil is improved, the stimulation depth within the skull is enhanced, the adverse effects on non-target areas are effectively reduced, and the safety of transcranial electromagnetic stimulation treatment is ensured.

The invention relates to an unmanned aerial vehicle wireless charging coupling mechanism with high anti-offset tolerance and an optimization method, and belongs to the technical field of unmanned aerial vehicle wireless charging with high anti-offset tolerance. Comprising a compensation coil and a composite circular coil, the compensation coil and the composite circular coil are connected in series to form a single current loop, and the composite circular coil comprises a large circular coil and a small circular coil which are connected in series in the same direction. Through a magnetic flux change increase and decrease complementation mechanism of the edge strong magnetic field characteristic of the compensating coil and the center strong magnetic field characteristic of the double-circle coil, the mutual inductance fluctuation ratio is smaller than or equal to 5% and larger than or equal to 25% in a traditional scheme under the offset working condition of the receiving end, and the effective offset tolerance is improved to 35% 140 mm / phi 400 mm of the diameter of the transmitting end and is increased by 2.1 times compared with a traditional unipolar structure; the structure breaks through the magnetic field distribution limitation of strong center and weak edge, and solves the problem of power stability fluctuation caused by horizontal offset.