117 results about "Magnetic current" patented technology

The invention relates to a main and collateral channel nursing instrument based on bioelectricity, which is applied to the field of physical therapy and is characterized in that a magnetic current sensor is used for monitoring the electrifying current condition of each electrode plate and skin, and when a certain area of conductive hydrogel is in poor contact with the skin, the area can be subjected to micro-regulation and control; the area is pressed downwards through the skin pressing device to be in close contact with the skin, skin burning caused by too high local current density due to poor contact is effectively avoided, and when the energizing current of the electrode plate is too high, the conductive hydrogel can be quickly separated from the skin through the magnetic attraction effect of the electromagnetic ring on the hanging barrel, so that the skin is prevented from being damaged due to too high current; in addition, when power supply current of the nursing instrument body to all the electrode plates is too high, the negative voltage electrode box can directly fall off from the skin, and compared with a direct cutting-off mode in the prior art, the situation that equipment is damaged due to sudden interruption of the current can be effectively avoided.

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.

The invention relates to the technical field of magneto-rheological polishing, and discloses magneto-rheological polishing equipment with adjustable magnetic field intensity and a method thereof.The magneto-rheological polishing equipment comprises a polishing workbench, a plurality of mounting rings are distributed on the inner wall of a first mounting groove from top to bottom, a plurality of magnetic sheets are fixedly arranged on the inner wall of each mounting ring at equal intervals, and a gear ring is fixedly arranged on the outer wall of a chuck; the container is extruded through the limiting mechanism, so that the container compresses the supporting assembly and then ascends and descends in the first mounting groove, the number of the mounting rings wrapping the outer portion of the container is increased, and then the number of the magnetic sheets wrapping the outer portion of the container and conducting magnetic flow induction with the magnetic needles in the container is increased; the magnetic field intensity in the magneto-rheological polishing process is properly adjusted, the magnetic field intensity of the magneto-rheological polishing equipment is adjusted by changing the number of the magnetic sheets wrapping the container, the polishing quality of workpieces made of different materials is improved, and the manufacturing cost of the polishing equipment is reduced.

The utility model belongs to the technical field of CVD equipment, and discloses a magnetofluid sealing device and epitaxy equipment, the magnetofluid sealing device comprises a cooling body and a magnetofluid assembly, the cooling body is provided with a first inlet and a first outlet, and the first inlet and the first outlet are communicated through a first flow channel arranged in the cooling body; the magnetic fluid assembly comprises a magnetic current cavity and a rotating shaft; the first end of the cooling body penetrates through the magnetic flow cavity, so that the first inlet and the first outlet are located outside the magnetic flow cavity, a magnetic flow cavity capable of containing the magnetic fluid is formed between the cooling body and the magnetic flow cavity, the rotating shaft is connected to the cooling body, and the second end of the cooling body can be connected with the driving part to drive the cooling body and the rotating shaft to rotate; the epitaxy equipment adopts the magnetofluid sealing device to perform heat exchange on the rotating shaft and the magnetofluid in the magnetic flow cavity, so that the temperature of the rotating shaft and the magnetofluid is reduced, and normal operation of the rotating shaft and the magnetofluid is ensured.

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.

The invention discloses a magnetic generator based on magnetic bias current, and belongs to the technical field of generators, the magnetic generator comprises a casing, a rotating shaft and a stator, the rotating shaft is provided with a plurality of fan-shaped iron cores and fan-shaped permanent magnets, the fan-shaped iron cores and the fan-shaped permanent magnets are distributed on the rotating shaft along the circumference, the fan-shaped iron cores and the fan-shaped permanent magnets are symmetrically arranged, the fan-shaped iron cores are provided with armature windings, and the armature windings are arranged on the stator. The stator comprises four fan-shaped permanent magnets which are opposite in polarity and symmetrically distributed at the two ends of the machine shell, and the four fan-shaped permanent magnets form an axial magnetic pole pair. According to the technical scheme, the iron core and the permanent magnets are arranged in the rotor, the direction of the magnetic field of the permanent magnets is opposite to the direction of an induced magnetic field generated by an armature winding of the iron core, and the induced magnetic field hinders rotation of the rotor; meanwhile, magnetic circuit performance is optimized through magnetic biasing current, starting energy consumption is reduced, and efficient power generation is achieved through the synergistic effect of the permanent magnet and the induced magnetic field.

The present invention discloses a composite ultra-wideband director, which is composed of a director vane and a magnetic current loop. The director vane is placed above the radiation surface of the oscillator, and the magnetic current loop is placed below the radiation surface of the oscillator with its vertical axis coinciding with that of the oscillator. In particular, by designing a double-layer director vane and a spiral magnetic current loop, the above-mentioned composite director realizes ultra-wideband plane wave conversion and gain improvement. The invention combines the plane wave conversion characteristic of the director vane with the characteristic of the magnetic current loop to improve the axial gain, providing a solution for a composite ultra-wideband and high-gain director, so as to better meet the requirements of current 5G ultra-wideband antennas. The present invention also provides a high-low frequency nested array.

Dry-running electromagnetic valve (1) comprising a valve housing (2) in which an electric coil (3) and an armature (5) are arranged, and a valve spool (8) which can be operated by the armature (5) in an axial operating direction for opening and closing the electromagnetic valve (1), the coil (3) generating a magnetic flow when the electromagnetic valve (1) is operated, which magnetic flow flows via a magnetically conductive valve housing outer wall (2c) of the valve housing (2) to the armature (5), in order to reduce the friction of the electromagnetic valve, it is provided according to the invention that in the valve housing (2) a magnetically conductive magnetic flux element (12) is provided, which introduces at least 80%, preferably at least 90%, particularly preferably 100% of the magnetic flow flowing through the valve housing outer wall (2c) into an armature end face (5B) of the armature (5) facing the coil (3).

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.

This application discloses a high-isolation terminal antenna system, relating to the field of antenna technology. It combines current-loop antennas and / or magnetic flux-loop antennas with different location characteristics to provide good radiation performance while maintaining good isolation. Specifically, the terminal antenna system includes a first antenna, a second antenna, and a third antenna. The first antenna, the second antenna, and the third antenna are either current-loop antennas or magnetic flux-loop antennas. When the current-loop antenna is working, a uniform magnetic field is distributed between the radiator of the current-loop antenna and the reference ground. When the magnetic flux-loop antenna is working, a uniform electric field is distributed between the radiator of the magnetic flux-loop antenna and the reference ground. The first antenna is disposed on a first side of the electronic device, the second antenna is disposed on a second side of the electronic device, and the third antenna is disposed on a third side of the electronic device. The first side and the third side are opposite each other, and both the first side and the third side are adjacent to the second side.

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 present invention discloses a Ku-band antenna array for drone communications, relating to the field of antenna design. The antenna array comprises a plurality of metasurface antenna units, wherein the metasurface antenna units comprise a metasurface layer and an SIW waveguide layer; a rectangular patch group arranged in an array with equal spacing is laid on the surface of the metasurface layer, the patch group comprising a first rectangular patch etched with slits in the same direction, a second rectangular patch etched with two short slits facing each other, and a third rectangular patch etched with short slots representing magnetic currents, wherein the second rectangular patch is symmetrical about the third rectangular patch; the SIW waveguide layer is pre-set with short-circuit vias and arrayed metal vias, which are used to couple and excite the characteristic modes of the metasurface layer after connecting the SIW feed layer and the slotted ground layer. The antenna array provided by the present invention is not only compact in structure, but also has broadband, high gain, and excellent directivity, and also has good polarization purity and anti-interference capabilities.

The invention discloses a power transformer multi-physics coupling simulation analysis method and a related device, and the method comprises the steps: constructing a corresponding geometric model and a multi-physics coupling model according to the obtained transformer data of a power transformer, and further determining a target simulation model; inputting a preset direct-current magnetic bias current into the target simulation model to simulate a direct-current magnetic bias state, and performing finite element analysis to obtain vibration displacement change distribution and sound pressure distribution; and according to the vibration displacement change distribution and the sound pressure distribution, determining the weak position of the power transformer influenced by the preset direct-current magnetic bias current. Therefore, accurate analysis and prediction of vibration and noise characteristics of the power transformer in the direct-current magnetic bias environment are realized by establishing a multi-physics field coupling model for analysis.

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 present invention relates to the technical field of microwave antennas, and in particular to a magnetic current-fed broadband dual-polarized microstrip array radio frequency antenna, comprising: an upper dielectric layer, wherein the upper and lower surfaces of the upper dielectric layer are respectively laminated with metal layers; a lower dielectric layer, wherein the upper and lower surfaces of the lower dielectric layer are respectively laminated with metal layers; the metal layer on the lower surface of the upper dielectric layer is laminated with the metal layer on the upper surface of the lower dielectric layer; the upper dielectric layer and the lower dielectric layer are detachably connected; an air cavity, which is provided between the upper dielectric layer and the lower dielectric layer; a plurality of input ports, wherein the contact ends of the input ports are provided on the upper metal surface of the upper dielectric layer, and the access ends of the input ports extend out of the lower metal surface of the lower dielectric layer; a plurality of coupling slots, which are provided on the lower metal layer of the upper dielectric layer and the upper metal layer of the lower dielectric layer; and a radiation unit, which comprises a ring resonator, which can reduce the influence of fluctuations in the voltage standing wave ratio and improve the stability of signal transmission.

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.

Disclosed are a dual-polarization cavity-backed antenna, a package module and an array package module. The antenna includes a substrate, a magnetic current feeding structure, an electric current feeding structure, and a cavity-backed structure that is arranged between two surfaces of the substrate. The magnetic current feeding structure and the electric current feeding structure transfer energy into the cavity-backed structure, respectively radiating the orthogonally polarized electromagnetic wave. The electric field direction of the first electromagnetic wave and the magnetic field direction of the second electromagnetic wave occur on the same plane. The package module includes the dual-polarization cavity-backed antenna, a radio frequency control chip, and a control circuit unit. The array package module includes a plurality of the dual-polarization cavity-backed antennas, a radio frequency control unit including a single RF chip or chip set, and a control circuit unit.

The present invention discloses a method and system for predictive current control of a permanent magnet synchronous motor, belonging to the technical field of permanent magnet synchronous motor control. When the torque instruction changes drastically in the medium and high speed range, the zero-beat predictive current control is very likely to cause output voltage saturation, resulting in the q-axis current being difficult to be excited to its instruction value by the saturated output voltage within one sampling cycle, thereby seriously reducing the dynamic performance of torque increase at medium and high speeds. To this end, the present invention first increases the rising rate of the q-axis current through a weak magnetic operation under the above circumstances, and then performs a torque increase operation at a greater q-axis current rising rate. An optimal weak magnetic current is determined based on the q-axis current rise time prediction algorithm, so that the total time required for the weak magnetic operation and the torque increase operation is minimized, which can effectively improve the torque dynamic performance of the zero-beat predictive current control at medium and high speeds.

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.

A power connector is provided that is configured to conduct a current. The power connector includes a base structure, an extension structure, and a connector head structure that define a current path for the current. The extension structure is coupled to and extends between the base structure and the connector head structure. The connector head structure includes a bore-hole that vertically extends into the connector head structure toward the base structure. The bore-hole is configured to receive a fastener for coupling the power connector to an electrical interface of a device. The connector head structure has a mechanical engagement feature configured to mechanically engage with a torque stabilization tool during a fastening of the fastener to the connector head structure in order to prevent a torque applied by the fastening of the fastener from being transferred to the extension structure.

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.