48 results about "Magnetic current" patented technology

An electronic device is provided. The electronic device includes a middle frame assembly and a conductor member electrically connected to the middle frame assembly. The middle frame assembly includes a metal middle frame and a border frame. The border frame is located on an outer periphery of the metal middle frame, and at least one border frame antenna is formed on the border frame. The metal middle frame and the conductor member are stacked, and a region on the metal middle frame corresponding to the conductor member and the conductor member define a radiation cavity. At least one feed point is configured to feed the border frame antenna and the radiation cavity. The at least one feed point excites the border frame antenna to generate a radiation current, and excites the radiation cavity to generate a radiation magnetic current, to form a circularly polarized antenna.

The application discloses an antenna module and an electronic device, and belongs to the technical field of communication. The antenna module comprises a first radiator, a metal floor and a feed source; the feed source is electrically connected with the first radiator; a first gap is formed between the metal floor and the first radiator; a first slot is formed in the metal floor; wherein the feed source is used for exciting a first current on the first radiator and exciting a first magnetic current at the first slot; under the action of the first magnetic current, a second current is formed on opposite sides of the metal floor; and the first current and the second current are consistent in phase.

This invention relates to the field of energy storage technology for new energy power plants, and discloses a multi-compartment coordinated charging and discharging intelligent control device for a new energy power plant energy storage system. The device includes a container body, multiple battery clusters and a DC power control cabinet installed on its inner wall. The energy storage EMS energy management system host sends control commands to drive the drive module to synchronously energize electromagnetic coil one and electromagnetic coil two to generate a directional magnetic field. Electromagnetic coil one, in conjunction with a magnetically conductive shell, magnetizes the iron core. The iron core magnetically attracts the I-shaped armature to compress the spring one, which slides downward along the inner wall of the connecting cavity and pulls the telescopic partition to divide the upper part of the connecting cavity into independent positive and negative magnetorheological chambers that are not connected. The magnetorheological fluid in the liquid chamber flows into the corresponding chamber and, under the action of the magnetic field of electromagnetic coil two, transforms from a liquid state into a rigid solid-like state and forms a dense conductive chain, thereby forming a conductive path to ensure that the battery clusters can be independently switched on and off and coordinated across multiple compartments.

This invention belongs to the field of computational electromagnetics numerical simulation and provides a simulation method for electromagnetic scattering of thin-coated targets based on Schur complement preconditions. First, for the IBC scattering target to be solved, equivalent surface current and equivalent surface magnetic current are introduced as independent unknowns. The electromagnetic scattering solution equation is established using SDIE and then discretized. Next, the impedance matrix is ​​decomposed into near-field and far-field matrices using an octree structure. For the near-field matrix, key operator sub-blocks are explicitly assembled and extracted. Then, approximate operators in block diagonal form and Schur complement operators are constructed and approximately inverted. Simultaneously, the diagonal product of intermediate blocks is pre-calculated and stored based on the approximate operators. Finally, the constructed preconditions are applied to the GMRES iterative solver. When the iteration error reaches the preset convergence criterion, the current and magnetic current distributions on the target surface are output. Further calculations of radiation characteristic parameters such as the target's radar cross section are then performed, achieving low-cost, high-efficiency, and easily parallelizable electromagnetic simulation solutions.

The application belongs to the technical field of electromagnetic modeling of targets in layered media, and specifically provides a plane multilayer medium electromagnetic scattering modeling method based on layered medium Green function, which is used to solve the problems of large number of unknown quantities and low calculation efficiency when analyzing the electromagnetic scattering characteristics of targets in layered media; first, the medium target in the plane multilayer medium is meshed; then, the layered medium Green function is calculated based on the space list and interpolation method, and the matrix equation of the target current and magnetic current is constructed by solving the surface integral equation of the target by using the method of moments; finally, the improved stacked non-diagonal low-rank matrix is used to solve the matrix equation to calculate the target scattering field. The application adopts a direct solving calculation method, effectively solves the problem of ill-conditioned matrix difficult to converge in the conventional iterative method, especially for the multi-port excitation problem, without the need for repeated calculation, improving the solving efficiency of large-scale problems and reducing the consumption of calculation resources.

A method includes receiving, from a sensor proximate a first conductor, a sensor signal representing a measurement of a magnetic field produced by a first current flowing in the first conductor and a second current flowing in a second conductor. The first current includes first and second current components having different frequencies, and the second current includes third and fourth current components. The third current component is phase shifted from, and has the same frequency as the first current component. The fourth current component has a different frequency from the third current component. The method also includes determining reference values of the first and second currents, and, based on the sensor signal and the reference values of the first and second currents, determining for the sensor, a plurality of coupling coefficients representing magnetic field coupling between the first and second conductors.

The invention discloses a phase-free electromagnetic source inversion positioning method and device based on adaptive sparse sampling, and the method comprises the steps: determining the position of an adaptive sparse sampling point for a to-be-measured electromagnetic source on a near-field scanning plane, so as to obtain the near-field distribution data of the corresponding sparse sampling point; recovering the near-field distribution data into uniform distribution data through an interpolation method, and extracting amplitude information to obtain phase-free data; establishing a forward radiation model of the equivalent electromagnetic source according to the electromagnetic field integral equation model and the mirror image effect, and constructing a corresponding error minimization objective function based on the phase-free data and the forward radiation model; performing iterative optimization on the phase-error-free minimization objective function by using an LM algorithm so as to perform inversion on the electromagnetic source to be measured to obtain equivalent magnetic current source distribution; and reconstructing a magnetic field according to equivalent magnetic current source distribution obtained by electromagnetic source inversion. According to the scheme, efficient reconstruction of the near-field radiation characteristics of the radio frequency circuit can be realized while the number of sampling points is reduced and the inversion precision is ensured.

This invention discloses a millimeter-wave wide-beam DRA, a wide-angle beam scanning phased array, and their design methods. The DRA consists of a DR and a microstrip coupling slot located directly below the DR. This invention enables the non-exciteable DRA to achieve TE by setting the dimensions of the slot and the DR. 112 The resonant frequency of the mode is close to that of the slot operating mode, and the field inside the DR will exhibit a similar behavior to that of the TE mode. 112 The field distribution of the mode forms an equivalent magnetic current parallel to the ground plane, thereby achieving wide beam characteristics in the E-plane and H-plane; moreover, arranging multiple such small-sized DRA units at equal intervals can form a linear phased array in the E-plane (H-plane), whose beam can be scanned from -72° to +72° (-65° to +65°), with a gain ripple of 2.5dB (0.5dB), and the present invention does not require any parasitic structures or additional active control circuits.

To provide a soft magnetic alloy powder capable of obtaining a magnetic core excellent in all of magnetic current superposition characteristics, magnetic permeability, and withstand voltage SOLUTION: The soft magnetic powder is represented by a compositional formula (Fe1-pX1p) 100 - (a + b + c + d + e) BaPbSicCdX2e (atomic ratio). The X1 part is one or more kinds selected from Co and Ni, and the X2 part is one or more kinds selected from Ti, Zr, Hf, Nb, Ta, Mo, Cr, W, Al, Ga, Ag, Zn, S, Ca, Mg, V, Mn, Sn, As, Sb, Bi, N, Au, Cu, rare earth elements and platinum group elements. 0 ≤ p ≤ 0.5, 2.00 ≤ a ≤ 20.00, 0.00 ≤ b ≤ 14.00, 0.00 ≤ c ≤ 10.00, 0.00 ≤ d ≤ 5.00, 0.00 ≤ e ≤ 3.00, and 70.00 ≤ 100 - (a + b + c + d + e) ≤ 96.00.SELECTED DRAWING: Figure 1

The invention discloses an ultra-wide beam antenna based on multi-magnetic-current superposition, and belongs to the field of microwave communication. The technical problems that an existing wide-beam antenna is limited in beam coverage range, and vertical polarization and end radiation cannot be considered at the same time are solved. The antenna comprises a top-layer metal structure, a dielectric substrate, a bottom-layer metal structure and a metalized through hole which are stacked in sequence, and the antenna is integrally in bilateral symmetry and integrates a single-ended short-circuit double-sided resonator, a double-ended open-circuit double-sided resonator, a pair of double-ended short-circuit double-sided strip-shaped resonators and a grounded coplanar waveguide transmission line. Through feed excitation of the grounding coplanar waveguide transmission line, the three resonators respectively generate clockwise semicircular magnetic current, front and back bidirectional semicircular magnetic current and vertical magnetic current, and superposing of multiple magnetic currents realizes ultra-wide wave beam vertical polarization end radiation. The antenna has the advantage of extremely wide beam width, and can give consideration to both vertical polarization and end radiation.

The application belongs to the technical field of magneto-fluid damper, and particularly discloses a magneto-rheological damper with quick response characteristic, which comprises a cylinder body and a piston rod, a piston head is vertically and slidably arranged in the cylinder body, a damping passage gap is formed between the piston head and the side wall of the cylinder body, the piston head comprises a sleeve and a magnetic core, the magnetic core comprises a plurality of magnetically conductive sheets which are connected with each other and sequentially connected along the circumference of the sleeve, a winding groove is formed in the magnetically conductive sheet, the piston rod is inserted into the cylinder body and coaxially connected with the sleeve, the chambers above and below the piston head are working chambers, and the working chambers are filled with magneto-rheological fluid. The application can effectively solve the time lag caused by the eddy current effect hindering the rise of the magnetic field strength in the damping passage, and improve the response speed of the magneto-rheological damper.

The invention relates to the field of mutual inductor equipment, in particular to an antimagnetic mutual inductor and an ammeter, which comprises an antimagnetic shell, a middle hole is formed in the middle of the antimagnetic shell, an iron core is arranged in the antimagnetic shell, a plurality of groups of windings are wound on the periphery of the iron core, the winding turns of the windings are different, a fixing ring is arranged in the middle of the periphery of the iron core, and the fixing ring is arranged in the middle of the periphery of the iron core. The two sides of the periphery of the fixing ring are each provided with a power connection port which is evenly distributed, the power connection ports in the two sides are symmetrically distributed, the two symmetrical power connection ports form a group, the power connection ports in each group are correspondingly connected with different windings, a separation ring is installed in the middle of the interior of the antimagnetic shell, the inner side of the separation ring is fixedly connected with a limiting ring, and the limiting ring is fixedly connected with the fixing ring. Through a linkage structure of multiple groups of symmetrical power connection ports and the rotating rings, the adjusting gear is driven by the adjusting knob, the rotating rings on the two sides can be driven to synchronously and reversely rotate, accurate butt joint of the power connection pieces and the power connection ports corresponding to windings with different turns is achieved, and transformation ratio adjustment is convenient and efficient.

The invention discloses a method for calculating flux weakening control reference current of a permanent magnet motor, and the method comprises the steps: calculating a voltage constraint coefficient according to the voltage of a DC bus, the flux linkage of a permanent magnet and the maximum no-load rotation speed, and representing the voltage limitation degree of a high-speed region; the weak magnetic expected current is directly obtained according to the coefficient, and rapid analysis without additional control links is achieved; the weak magnetic current is corrected by combining the motor resistance and the operation current, so that the adaptability of a high-speed region is improved; and the flux weakening current range is automatically constrained through current amplitude limiting judgment, and the safe operation margin is ensured. Error accumulation of torque control reference current can be avoided, and the control precision of a weak magnetic region is remarkably improved; double mechanisms of dynamic compensation and amplitude limiting protection are adopted to adapt to complex working conditions of a high-speed area, and the anti-interference capability is excellent; an additional PI controller or a torque current calculation module is not needed, the real-time performance is high, and engineering implementation is facilitated; and the voltage constraint is accurately matched, the utilization efficiency of the DC bus voltage is maximized, and higher rotation speed expansion is supported.

The embodiment of the application discloses a low-profile small-size wideband omnidirectional vertical polarization slot antenna, which comprises a dielectric plate arranged on the top of a metal radiator and in contact with the metal radiator, the metal radiator is in contact with the metal layer of the dielectric plate, the side wall of the metal radiator is provided with a slot, and an omnidirectional vertical polarization radiation mode is formed through equivalent magnetic current radiation of the slot; the metal feeding probe comprises an inner conductor and an outer conductor in a coaxial structure; a circular truncated cone-shaped metal cavity is formed in the metal shell, the inner conductor is connected with the bottom of the metal shell, the antenna radiator is arranged in the metal cavity, the outer conductor penetrates through the metal radiator, and the top end is in abutting contact with the metal layer of the dielectric plate and is fixedly connected through the assembly surface of the dielectric plate and the circular truncated cone-shaped shell to form a radome. The technical scheme provided by the embodiment of the application solves the problem that the existing omnidirectional antenna form is relatively complex in structure and it is difficult to realize more functions in one structure.

The invention discloses a low-fluctuation double-end-direction radiation vertical polarization antenna which comprises a hole loading type double-face patch resonator and a two-end open-circuit substrate integrated waveguide resonator. And the two hole loading type double-sided patch resonators are symmetrically arranged on the left side and the right side of the two-end open-circuit substrate integrated waveguide resonator. The two-end open-circuit substrate integrated waveguide resonator is fed from the bottom to the center by a coaxial line to form an internal homodromous vertical electric field. The hole loading type double-sided patch resonator forms four equidirectional magnetic currents at two ends and a reverse magnetic current in the middle, and the four equidirectional magnetic currents and the reverse magnetic current are superposed with equivalent magnetic currents of the open-circuit substrate integrated waveguide resonators at two ends, so that low-fluctuation vertical polarization double-end radiation is realized, and bidirectional radiation is direct radiation.

This invention belongs to the field of antenna performance testing technology, specifically disclosing a method and system for calculating the ground effect of a vehicle antenna based on spherical near-field measurements. The method includes: measuring the vehicle antenna in a full-wave spherical near-field anechoic chamber to obtain the ground effect of the antenna under test. r The spherical near-field component at 0; the coefficients of the spherical wave mode are obtained using spherical wave expansion; the antenna under test is calculated at... r The electric and magnetic fields at point 1 r 1 <r 0; and transform the electric and magnetic fields in spherical coordinates into rectangular coordinates; calculate the normal vector of each equivalent source point; and calculate the radius by combining the rectangular coordinates of the electric and magnetic fields respectively. r The equivalent current and equivalent magnetic current on the sphere are calculated; then the mirror equivalent current and mirror equivalent magnetic current are obtained respectively; the far field of the equivalent source and the mirror source are calculated, which is the antenna pattern of the vehicle antenna under the PEC ground. The method of this invention does not require the establishment of integral equations, the calculation process is simple, and the computer resource requirements are low.

Embodiments of the present application relate to the technical field of antennas, and provide a terminal antenna and an electronic device. The solution enables circularly polarized wide-angle radiation over the upper hemispherical spatial domain above the electronic device. The terminal antenna comprises: a first radiator and a reference ground. The projection of the first radiator onto a first plane where the reference ground is located is a first projection. The first projection is comprised within the projection of the reference ground onto the first plane. The first radiator is provided with a feed point and a grounding structure. The first radiator is electrically connected to the reference ground by means of the grounding structure. When the first radiator is operating, an annular magnetic current is distributed between the first radiator and the reference ground. A first current is distributed on a first edge of the reference ground, and the phase of the first current is different from the phase of the annular magnetic current.

The device for automatically controlling rotor cooling oil flow of the present invention includes a housing having cooling oil channels; an input shaft, which is a hollow shaft rotatably disposed inside the housing; a rotor shaft connected to the input shaft, the rotor shaft having a first oil chamber arranged axially; and an oil guide pipe, the oil guide pipe being arranged axially inside the input shaft, the oil guide pipe having an oil guide hole arranged axially, the first oil chamber communicating with the cooling oil channels through the oil guide hole, the oil guide hole being a tapered hole with its diameter increasing in the direction away from the rotor shaft. When the motor is running at high speed, the device of this application can reduce the amount of cooling oil in the rotor, so as to reduce the rotor oil slinging and churning losses when the motor is running at high speed. Furthermore, the reduction in the amount of cooling oil in the rotor can increase the temperature of the rotor magnets, reduce the performance of the magnets, reduce the high-speed weak magnetic current, reduce copper loss, thereby improving the motor efficiency.

The invention relates to a charging system and a charging method of a secondary battery. A secondary battery charging system is provided with: a current sensor that measures a current flowing through a secondary battery; and a control device for controlling the charging of the secondary battery by referring to the measurement value of the current sensor during the charging of the secondary battery. The current sensor comprises a magnetic current sensor. The charging control includes setting of a chargeable current value permitted in charging of the secondary battery. When a ripple is detected from the measurement value of the magnetic current sensor and the current value of the detected ripple is equal to or greater than a predetermined current value, the rechargeable current value is set using the current value of the detected ripple.

A magnetic field sensor architecture is disclosed that provides improved bandwidth and noise performance through the use of three distinct magnetic sensing elements: a spinning Hall- effect sensor for low-frequency and DC sensing, a non-spinning Hall-effect sensor for mid- frequency sensing, and a pickup coil for high-frequency sensing. The sensor combination includes a summing stage comprising frequency-selective filtering elements that process the outputs of the sensing elements to achieve a flat composite frequency response from DC to high frequencies. Two independently selectable crossover frequencies are used to decouple noise optimization from ripple suppression. In some embodiments, the pickup coil and non- spinning Hall-effect sensors are combined and processed through a shared path, with a simplified filter structure.

The invention relates to a circularly polarized filtering dielectric resonator antenna array with a folded spiral structure, and belongs to the technical field of antennas. The dielectric resonator antenna array sequentially comprises an antenna unit, an H-shaped microstrip power divider, a dielectric substrate 1, a metal ground 1, a coplanar waveguide structure, a dielectric substrate 2 and a metal ground 2 from top to bottom. The dielectric resonator antenna array is composed of four units; the antenna unit is composed of a folded metal spiral strip and a hollow cylindrical dielectric resonator. A metal spiral strip and a hollow cylindrical dielectric resonator are designed in a nested mode, currents and equivalent magnetic currents which are the same in direction, have the 90-degree phase difference and are equal in amplitude are generated, and therefore the circular polarization radiation function is achieved. And a band-pass filtering function is realized by a feed structure combined by the substrate integrated waveguide cavity and the coplanar waveguide. The bandwidth, gain and axial ratio indexes are suitable for ground equipment in a C-band satellite communication system.

The invention relates to the technical field of electromagnetic full-wave inversion, in particular to a two-dimensional cross-layered efficient electromagnetic full-wave inversion method based on a spectral element boundary integral method.During forward modeling calculation, a scatterer crossing multiple horizontal layers is surrounded by a one-dimensional smooth boundary, and two-dimensional electromagnetic field distribution is solved by adopting a spectral element method in a region; accurately truncating an SEM solving domain on the boundary by using a boundary integral equation; for a transverse electric mode and a transverse magnetic mode, equivalent current / magnetic current is solved by using BIE, and a receiver scattering field is calculated in combination with a layered two-dimensional vector Green function; in the full-wave inversion, in order to reconstruct TE mode isotropic scatterer model parameters and TM mode anisotropic scatterer model parameters respectively, first-order derivatives of a mass matrix and a stiffness matrix relative to the corresponding parameters are calculated respectively, a sensitivity matrix is constructed, and an LM optimization algorithm is adopted to iteratively call an SEBI forward solver to complete inversion; multiple groups of numerical experiments verify the accuracy and high efficiency of the SEBI-LM algorithm in forward modeling and FWI.

The invention relates to an antenna assembly and electronic equipment, and belongs to the technical field of electronic equipment, the antenna assembly comprises a decoration part, a radiation slot and a feed structure, a second assembly part of the decoration part surrounds and protrudes out of a first assembly part, and the first assembly part is provided with a light transmission structure. The second assembly part is provided with a radiation slot, the feed structure and the decorative part are spaced, and the feed structure feeds the radiation slot in a coupled manner. The space in the decorating part is fully utilized, the position area of the light-transmitting structure does not need to be avoided, and the isolation degree and the layout flexibility of the antenna assembly are improved. The feed structure can realize coupled feed to the radiation slot, so that the radiation slot can be equivalent to a magnetic current source, and the antenna assembly can be constructed to be a magnetic current-based antenna which is different from an antenna assembly formed by a frame and the like of the electronic equipment in type. Therefore, the antenna assembly provided by the invention naturally has good isolation with other antenna assemblies in the electronic equipment, and the problems that the antenna assembly on the electronic equipment is low in layout flexibility and poor in isolation are solved.

The invention discloses a magnetic torquer magnetic current driving real-time compensation method, which comprises the following steps: firstly, carrying out voltage reverse acquisition on a magnetic current driving circuit, calibrating the precision of acquired resistance and voltage, then recording the magnitude of a magnetic current instruction and an actual magnetic current within a period of time, and carrying out linear fitting through least square to obtain a magnetic current driving real-time compensation result; and a magnetic current compensation coefficient is calculated, and real-time correction of the magnetic current driven by the magnetic current is realized. According to the method, the actual magnetic current driven by the magnetic torquer can be calculated and compensated on orbit in real time, high-precision control over the magnetic current is achieved, the precision of the output torque of the magnetic torquer is improved, and a better foundation is provided for satellite high-precision attitude control.

The embodiment of the invention discloses a laminated patch antenna with a slit in the center, and the laminated patch antenna with the slit in the center is characterized in that each composite structure is tightly laminated along the vertical direction, so that a structure in which a plurality of dielectric layers and a plurality of metal patches are alternately laminated is formed as a radiator; a feed slot mode and a slot mode of the upper-layer patch can exist at the same time during working, a structure formed by the upper-layer patch, the lower-layer patch and the metal via hole is equivalent to a magnetic current element mode, and the three modes are superposed to form a broadband, so that the laminated patch antenna with a slot in the center realizes the broadband characteristic through multi-mode excitation; as no high-order mode participates, the in-band directional diagram of the laminated patch antenna with the central slot has the characteristics of symmetry, stable gain, low cross polarization, low sidelobe and low back lobe, and the laminated structure is easy to realize the antenna with small size and low profile, so that the laminated patch antenna with the central slot can take both miniaturization and broadband performance into consideration. The antenna is widely applied to the technical field of antennas.

The application discloses a fast multipole electromagnetic simulation method based on a PMCHW equation, and comprises the following steps: regarding a filter as an ideal conductor under port voltage excitation feed, processing the current and magnetic current of a dielectric surface in the filter and the current of a metal surface, using an EFIE equation to describe the current of the metal surface, using a PMCHW equation to describe the current and magnetic current of the dielectric surface, and combining the two equations to obtain an EFIE-PMCHW equation of the filter, and selecting to solve the EFIE-PMCHW equation by using a moment method or a fast multipole method. The application can more quickly and accurately calculate electromagnetic problems of a complex metal dielectric model, divides the model into blocks, calculates the near field and the far field through the distance between the blocks, calculates the near field by using the moment method, and approximately calculates the far field by using the fast multipole, so that compared with other methods, the matrix filling and matrix equation solving time are reduced, and the simulation speed is accelerated.

A four-frequency-band directional vehicle-mounted antenna comprises a metal floor, a dielectric substrate, a slotted radiation patch unit, a coaxial feeding structure and two T-shaped monopole branches. The slotted radiation patch unit is a circular patch, four L-shaped slots are formed on the circumferential edge of the circular patch, the L-shaped slots can change the current distribution of the high-order mode of the circular patch, reshape the irregular conical beam, and form a directional inclined double beam; meanwhile, the introduction of the L-shaped slots can increase the current path and thus reduce the resonance frequency of high frequency. The two T-shaped monopole branches are oppositely and equally spaced on the two sides of the slotted radiation patch unit, used to excite the equivalent magnetic current on the two end edges of the circular patch, and the equivalent magnetic current is symmetric about the center, thus forming a directional inclined double beam with higher gain value.

The application discloses a miniaturized compact vertical polarization end-fire microstrip antenna, which comprises an upper layer radiation patch structure, a middle layer dielectric substrate and a lower layer metal ground plate; the upper layer radiation patch structure is composed of a first patch serving as a driver and a second patch serving as a director; the first patch and the second patch are linearly arranged on the upper surface of the dielectric substrate along the end-fire direction and work at the fundamental TM 10 mode or TM 01 mode; the relative dielectric constant of the middle layer dielectric substrate is greater than or equal to 8, so as to shorten the distance between the first patch and the second patch working at the fundamental TM 10 mode or TM 01 mode; the equivalent magnetic current interval distance between the two radiation edges of the respective patches of the first patch and the second patch; the end-fire direction radiation is realized by adjusting the length of the circumscribed rectangle of the first and second patches in the end-fire direction and the coupling gap between the two patches; the application can be directly attached to a metal platform for use without an additional reflector and multiple directors, and has the advantages of compact structure, low profile, easy processing and adaptation to high-speed mobile carrier communication.