126 results about "Electromagnetic current" patented technology

A magnetic forming system (10) for creating a fluid circuit joint between a tube and a fitting includes an induction coil (12). The induction coil (12) may form a first stage electromagnetic current. A field concentrator (132) may focus the first stage electromagnetic current to form a second stage electromagnetic current. An insert (136) may focus the second stage electromagnetic current to form an electromagnetic field. The electromagnetic field forms the fluid circuit joint. The induction coil (12) may be insertable within the tube, generate an electromagnetic field, and impose the electromagnetic field on and to expand a portion of the tube within the fitting to form the fluid circuit joint. The system (10) may include a receptacle (54) that is external to the tube and the fitting. An insert (56) may be mechanically coupled within the receptacle (54) and limit the outward expansion of the tube and the fitting.

A build-up structure for chip to chip interconnects and System-In-Package utilizing multi-angle vias for electrical and optical routing or bussing of electronic information and controlled CTE dielectrics including mesocomposites to achieve optimum electrical and optical performance of monolithic structures. Die, multiple die, Microelectromechanical Machines (MEMs) and / or other active or passive components such as transducers or capacitors can be accurately positioned on a substrate such as a copper heatsink and multi-angle stud bumps can be placed on the active sites of the components. A first dielectric layer is preferably placed on the components, thereby embedding the components in the structure. Through various processes of photolithography, laser machining, soft lithography or anisotropic conductive film bonding, escape routing and circuitry is formed on the first metal layer. Additional dielectric layers and metal circuitry are formed utilizing multi-angle vias to form escape routing from tight pitch bond pads on the die to other active and passive components. Multi-angle vias can carry electrical or optical information in the form of digital or analog electromagnetic current, or in the form of visible or non-visible optical bussing and interconnections.

A build-up structure for chip to chip interconnects and System-In-Package utilizing multi-angle vias for electrical and optical routing or bussing of electronic information and controlled CTE dielectrics including mesocomposites to achieve optimum electrical and optical performance of monolithic structures. Die, multiple die, Microelectromechanical Machines (MEMs) and / or other active or passive components such as transducers or capacitors can be accurately positioned on a substrate such as a copper heatsink and multi-angle stud bumps can be placed on the active sites of the components. A first dielectric layer is preferably placed on the components, thereby embedding the components in the structure. Through various processes of photolithography, laser machining, soft lithography or anisotropic conductive film bonding, escape routing and circuitry is formed on the first metal layer. Additional dielectric layers and metal circuitry are formed utilizing multi-angle vias to form escape routing from tight pitch bond pads on the die to other active and passive components. Multi-angle vias can carry electrical or optical information in the form of digital or analog electromagnetic current, or in the form of visible or non-visible optical bussing and interconnections.

The invention discloses an electromagnetic current coupling field assisted hybrid melting-brazing method for a laser-TIG arc and equipment. In addition to the use of the welding zone, an alternating magnetic field is added to control properties of plasma formed through ionization of laser, arc and a raw material metal, thereby improving the laser utilization rate. Under the electric field assisted comprehensive effect, the weld melting depth is increased, and the assistant effect on the melting bath of the liquid-state brazing filler metal for laser-arc melting-brazing is realized through electromagnetic stirring and excitation and enhancement, thereby promoting the orderly flow of the liquid-state brazing filler metal and the rupture, wetting, spreading and proliferation of the liquid-state brazing filler metal on the surface of the high metal material, improving the full mixing of the liquid-state brazing filler metal and the base metal formed by melting the low-melting-point metal material, improving the uniformity of the components of the brazed weld, stabilizing the welding process, reducing welding defects, increasing the welding speed, improving the weld formation, optimizing the structure and performance of the brazed weld, and improving the quality of the brazed joint. Moreover, the equipment has the advantages of simple structure, flexible application, low cost, good effect and easy realization.

In part, the disclosure relates to an electromagnetic current displacement apparatus that includes one or more magnetic field sources and an alternating current source. The apparatus includes current delivery electrodes that may be part of a cuff, a hand held device, or individual electrode pads suitable for temporary fixation to skin. In one embodiment, an alternating current is transcutaneously delivered using skin contacting electrodes sized and arranged to avoid hotspots and provide a uniform delivery of the current. In turn, current attractors and repulsors can be arranged on the skin or in a suitable device to push or pull sections of the current that is disposed below such elements. Magnetic fields can be applied and focused to the regions through which the current passes, effectively pushing the current deeper into a target region below the surface of the skin.

The invention discloses a minitype composite vibration power generator belonging to the field of minitype power technology and energy-saving technology. The minitype composite vibration power generator is a cantilever beam vibration power generator compounded by piezoelectricity and electromagnetism and mainly comprises an insulating shell, a piezoelectric cantilever beam, a permanent magnet and an inductance coil, wherein the piezoelectric cantilever beam consists of a piezoelectric sheet and a supporting substrate; the piezoelectric sheet is bonded on the supporting substrate; one end of the supporting substrate is fixed on the insulating shell; the permanent magnet is bonded with a free end of the piezoelectric cantilever beam; and an inductance coil is arranged right above the permanent magnet. Under the resonant state, the power generator synchronously outputs the piezoelectric current and the electromagnetic current; the output power is improved within the finite volume; furthermore, by adopting the structure of dispersing mass blocks, the energy collecting density is improved, and the working frequency scope is enlarged simultaneously.

An electromagnetic telemetry system for transmitting data from a downhole assembly, which is operationally attached to a drill string, to a telemetry receiver system. The data are typically responses of one or more sensors disposed within the downhole assembly. A downhole transmitter induces a signal current within the drill string. The signal current is modulated to represent the transmitted data. Induced signal current is measured directly with the telemetry receiver system. The telemetry receiver system includes a transformer that surrounds the path of the current, and an electromagnetic current receiver. The transformer preferably comprises a toroid that responds directly to the induced signal current. Output from the transformer is input to an electromagnetic current receiver located remote from the downhole assembly and typically at the surface of the earth. Alternately, voltage resulting from the induced signal current can be measured with a rig voltage receiver and combined with the direct current measurements to enhance signal to noise ratio.

A microstrip patch antenna includes a plurality of radially extending perturbations about the perimeter of the patch. The flow of electromagnetic current progressing along the perimeter of the patch is perturbed and results in an effective electromagnetic diameter substantially greater than the actual physical diameter of the patch.

There is disclosed herein an apparatus for electromagnetic forming, joining or welding a workpiece, the apparatus including at least two multi-turn solenoid coils wound in a manner that cooperatively encircles the workpiece to be formed. The apparatus also includes an electrically insulative shell encasing each coil and an electromagnetic current source electrically connected to the coils that generates an electromagnetic field. A hinge mechanism connects the insulative shells and a locking mechanism secures the shells and coils around the workpiece during electromagnetic field generation. A conductive rod joins the solenoid coils and permits series current flow between the coils. The apparatus further includes a shaper that encircles the workpiece and which restricts movement of the workpiece during electromagnetic forming. The shaper concentrates the generated electromagnetic field on the workpiece.

The invention discloses an electromagnetic scattering property simulating method based on cylindrical surface equivalent source domain decomposition. The method comprises the following steps of: establishing a model, dividing sub-regions and dissecting; opening electromagnetic current on each sub equivalent cylindrical surface and each sub scatterer, and determining the basic function coefficient of the equivalent incident electromagnetic current on each sub equivalent cylindrical surface; converting the basic function coefficient of the equivalent incident electromagnetic current on the sub equivalent cylindrical surface of a non-rotational symmetrical body into an RWG (Vector Triangle Basis Function) coefficient; determining an incident electric field generated on the surface of the corresponding sub scatterer by the equivalent incident electromagnetic current on each sub equivalent cylindrical surface, and determining scattering current on the surface of the sub scatterer in each sub-region; determining the scattering electromagnetic current on each sub equivalent cylindrical surface, taking the scattering electromagnetic current as the incident current of any other sub-region, and updating the scattering electromagnetic current coefficient on each sub equivalent cylindrical surface until the scattering electromagnetic current coefficient is balanced; and determining the radar scattering sectional area of a far field to finish the electromagnetic scattering property simulation. The invention provides a stable and efficient electromagnetic simulating method suitable for metal targets with any shapes.

The invention discloses a method and a device for comparing running errors of an optical current transformer and an electromagnetic current transformer in real time, which are suitable for an intelligent substation provided with the optical current transformer and the electromagnetic current transformer at the same time. The field running error of the optical current transformer is subjected to data storage and remote analysis by utilizing a real-time ratio of field running errors, so that a data basis is provided for analysis of the running error of the optical current transformer; and the field running error of the optical current transformer is monitored in real time, so that the accuracy and the reliability of electric energy metering of the intelligent substation are guaranteed. Therefore, a good application prospect is achieved.

A magnetic bearing device comprises a controller configured to obtain magnetic levitation information of the rotor shaft by AD sampling of current detection signals from the plurality of current sensors and a sum signal obtained by adding the pair of current detection signals relating to the pair of electromagnets, and perform PWM control of the excitation amplifiers based on the magnetic levitation information. The controller performs PWM control so that a length of one of an on-duty period and an off-duty period of the PWM carrier signal is always longer than a predetermined time period based on an attenuation characteristic of a spike noise produced in the electromagnetic current, and performs the AD sampling after the predetermined time period passes from starting timing of one of the on-duty period and the off-duty period.

A system and method for communicating with a downhole tool is disclosed. In one embodiment, a telemetry system for communicating with a downhole tool in a wellbore includes a first electrode. A modulated electric current flows from the first electrode through a formation to the downhole tool. The telemetry system also includes a downlink box, which provides the modulated electric current to the first electrode. The downhole tool comprises a sensor unit, which detects the modulated electric current. The telemetry system includes a second electrode that allows the modulated electric current to return to the downlink box. The telemetry system also includes an uplink telemetry, wherein the uplink telemetry does not comprise electromagnetic telemetry. In some embodiments, the downlink may be operated while mud pumps are turned off. The downlink may also be operated while the downhole tool is sending uplink telemetry by a method other than electromagnetic current.

The invention discloses a wind turbine fan radar echo signal Doppler spectrum solving method. The wind turbine fan radar echo signal Doppler spectrum solving method comprises the following steps: first, determining a rotating angle interval for calculating a blade static RCS by utilizing the 'Nyquist sampling theorem' according to the derived equivalence relation between blade dynamic radar cross section fluctuation frequency and blade radar echo signal Doppler frequency; then, respectively calculating the RCS of a wind turbine blade at various sampling angles by utilizing a mixed algorithm consisting of a physical optics method and an equivalent electromagnetic current method, so that a blade dynamic RCS is obtained based on a 'quasi-static method'; finally, performing discrete short time Fourier transform on the obtained blade dynamic RCS, and solving to obtain the Doppler spectrum of the blade dynamic RCS, namely, the Doppler spectrum of the blade radar echo signal. According to the wind turbine fan radar echo signal Doppler spectrum solving method, a new method and a new way can be provided for effectively identifying a wind turbine target by a radar station, and theoretical basis can also be provided for the aspects, such as electromagnetic scattering reduction of a wind power plant, and wind power plant clutter extraction and inhabitation of the radar station.

ACA based-MLFMA-accelerated fast simulation modeling method for domain decomposition non-conformal mesh comprises the following steps: S1, according to the structure and material characteristics of the target, the target is divided into regions, and discretizing then the mesh on each different region, and separately dividing the mesh between adjacent regions to form non-conformal mesh; S2, separating the mesh between adjacent regions to form non-conformal mesh; S2, selecting appropriate basis function to simulate local electromagnetic current, and using integral equation operator to form matrix equation; S3, using ACA-MFLMA algorithm compresses the matrix equation and iterates quickly to accelerate the solution of the matrix equation, obtains the position induction coefficients of the local electromagnetic current, and then obtains the distribution of the induced electromagnetic current on the target. S4, taking the induced electromagnetic current as the secondary radiation source, theelectromagnetic field distribution in the near region and the scattering characteristics of the far field are calculated, and the electromagnetic field response characteristics of the target are analyzed. The advantages of the method are that it makes full use of the advantages of ACA and MLFMA, and greatly improves the capability of solving the engineering electromagnetic field characteristics.

The invention relates to a harmonic transmission modeling method of an electromagnetic current transformer. The harmonic transmission modeling method comprises the following steps: obtaining a primary-side harmonic current signal of the current transformer, detecting a primary-side harmonic current effective value and circuit transformer remanence, ensuring that a hysteresis loop model based on improved J-A is the hysteresis loop model associated with primary current frequency change information, obtaining secondary current corresponding to each component signal of a secondary side of the current transformer after hysteresis loop model transmission is carried out, obtaining an effective value generated after the secondary current is transmitted, and calculating the ratios of transformation of the current transformer under different frequencies. The harmonic transmission modeling method which is put forward by the invention can realize conversion simulation from primary current to secondary current under different frequencies, and improves metering and measurement accuracy under a harmonic condition.

A system and method for communicating with a downhole tool is disclosed. In one embodiment, a telemetry system for communicating with a downhole tool in a wellbore includes a first electrode. A modulated electric current flows from the first electrode through a formation to the downhole tool. The telemetry system also includes a downlink box, which provides the modulated electric current to the first electrode. The downhole tool comprises a sensor unit, which detects the modulated electric current. The telemetry system includes a second electrode that allows the modulated electric current to return to the downlink box. The telemetry system also includes an uplink telemetry, wherein the uplink telemetry does not comprise electromagnetic telemetry. In some embodiments, the downlink may be operated while mud pumps are turned off. The downlink may also be operated while the downhole tool is sending uplink telemetry by a method other than electromagnetic current.

A system and method for magnetic levitation with a tilted orientation. In one embodiment, a magnetic levitation base together with a magnetic levitation affecting element that is located to the side of the levitation base support the magnetic levitation of a spinning magnetic top in a tilted orientation. The tilt angle of the levitating magnetic top may be greater than the tilt angle of the levitation base. In one embodiment, the levitation affecting element may comprise one or more magnets similar to that of the levitation base. The mass of the top and the tilt of the levitation base that are required for magnetic levitation may be adjusted by adjusting the levitation affecting element (e.g. altering its position and / or the strength of its magnetic field.) The general direction of the tilt may be reversed by changing the magnetic north-south direction (e.g. turning over or reversing the electromagnetic current) of the levitation affecting element.

The invention discloses a rotatable symmetrical radome and parabolic antenna integrated electromagnetic scattering simulation method, which comprises the following steps of 1) establishing a local rectangular coordinate system of a rotatable symmetrical radome, a local rectangular coordinate system of a parabolic antenna and a virtual equivalent sphere, and then subdividing and discretizing each generatrix; 2) adding an excitation source and determining excitation vectors; 3) respectively establishing impedance matrixes and inverse matrixes thereof in the two rectangular coordinate systems; 4) determining scattering matrixes and transmission matrixes; 5) establishing a relationship between the two rectangular coordinate systems by rotating the coordinate systems, and converting equivalent electromagnetic current on the virtual equivalent sphere between the two local rectangular coordinate systems; 6) establishing a solving equation set according to information obtained in the step 2 to the step 5, and resolving to obtain equivalent scattered electromagnetic current on the rotatable symmetrical radome and the virtual equivalent sphere; and 7) determining radar scattering section area according to a reciprocal theory. The rotatable symmetrical radome and parabolic antenna integrated electromagnetic scattering simulation method provided by the invention has the advantages of fast speed, low internal memory consumption and high solving precision.

The invention relates to a travelling wave fault ranging method and a travelling wave fault ranging device based on the differential output of a Rogowski coil, and belongs to the field of relay protection of electric power systems. The conventional travelling wave ranging method has congenitally deficient reliability and accuracy due to the constraint of the bandwidth of an electromagnetic current transformer (CT). A sensing head, namely the Rogowski coil of an electronic current transformer (ECT) has the advantages of simple structure, wide frequency band, high linearity, high response speed and the like, and is extremely suitable for transmitting travelling wave signals. An output signal of the Rogowski coil is the differential coefficient of primary current, amplitude variations at discontinuity points are extremely obvious, and the detection of a travelling wave head is further facilitated. The invention provides a new method for positioning faults by directly using current travelling wave differential signals (named differential travelling waves in the invention) output by the Rogowski coil. By the method, the problem of positioning of travelling wave faults in a digital (intelligent) electric substation is solved.

The invention relates to an electromagnetic current protector and relative method, wherein it has up and low structures; the low base is matched with track, while it contains mutual inductor, wiring base and main circuit; the up base is matched to mount executor and test circuit; the elements are tree layered in base and compressing plate while they are covered by compressing plate, and fixed via screw; the base and compressing plate are connected via one main axle; the elements rotate around main axle; the rotation disc is on two steps of base; the jump clamper and disc will operate via the spring force; the disc will not make whole device incline via the spring force. The invention has high reliability, while the return element and disc are matched via grooves, to prolong service life.

A residual current protection device, comprising: a first detection magnetic core (107) and a second detection magnetic core (108) which are borne around a conducting wire of a main loop; a first fault current detection circuit (102) coupled with the first detection magnetic core (107), wherein the first fault current detection circuit (102) is dependent on a grid voltage and conducts full current sampling on the main loop, so as to detect a high-frequency alternating current fault residual current, a pulse direct current residual current and a smooth direct current residual current; a second fault current detection circuit (103) coupled with the second detection magnetic core (108), wherein the second fault current detection circuit (103) conducts electromagnetic current sampling on the main loop independent of the grid voltage, so as to detect a power-frequency alternating current residual current and a pulse direct current residual current; a drive circuit (104), wherein the input thereof is connected to the first fault current detection circuit (102) and the second fault current detection circuit (103), and the output thereof is connected to an executing mechanism (106) to trigger the executing mechanism (106) to act; and a bipolar power source module (105) connected to the main loop and the first fault current detection circuit (102).

An interchangeable sleeve for enhancing proliferation of cells in a rotating bioreactor is disclosed with the interchangeable sleeve having a substantially cylindrical and substantially rigid electrical conductive material wound in a cylindrical shape and capable of being connected to a pulsating time varying electromagnetic current to create a time varying electromagnetic force of from approximately 0.05 gauss to 0.5 gauss within the cylindrical portion of the sleeve.

An interchangeable sleeve for enhancing proliferation of cells in a small-scale culturing container is disclosed with the interchangeable sleeve having a substantially cylindrical and substantially rigid electrical conductive material wound in a cylindrical shape and capable of being connected to a pulsating time varying electromagnetic current to create a time varying electromagnetic force of from approximately 0.05 gauss to 0.5 gauss within the cylindrical portion of the sleeve.

The invention discloses a positioning device and positioning method for an electromagnetic current meter. The positioning device is connected with an electromagnetic current meter fixing frame, and the electromagnetic current meter is arranged on the electromagnetic current meter fixing frame. The positioning device comprises an air pump, a plurality of elastic tubes, a plurality of metal sleeves and depth indicating plates. The metal sleeves are arranged on all the elastic tubes and sequentially connected in an insertion mode, and the depth indicating plates are arranged on the metal sleeves of the upper portions of all the elastic tubes. The elastic tubes are in clearance fit with the metal sleeves, the metal sleeves located at the lower ends of the elastic tubes are fixedly connected with the fixing frame of the electromagnetic current meter, the lower ends of the elastic tubes are connected with the metal sleeves in a sealing mode, and the upper ends of the elastic tubes are connected with the air pump through connecting tubes. The positioning device and positioning method have the advantages of being capable of accurately positioning the electromagnetic current meter, guaranteeing stability of the electromagnetic current meter and effectively improving accuracy and reliability of detection data.

The present invention relates to the electric power automation technology, and aims to provide a demagnetizing circuit and method for removing residual magnetism of an electromagnetic current transformer on line. The demagnetizing circuit comprises a series connection structure formed by a third resistor and an inductor, a third switch is also connected in parallel at two ends of the inductor, the series connection structure is connected in parallel at two ends of a secondary side of a current transformer with a second resistor and a first switch, an outer end of the third resistor is earthed, an outer end of the inductor is connected to one end of a direct current power supply through a second switch, the other end of the direct current power supply is earthed, and a first resistor is disposed between the second resistor and a non-earthing end of the first switch. With adoption of the circuit and the method, the residual magnetism inside the current transformer is removed within a very short time when the switches are disconnected, and the accuracy of relay protection setting calculation and the reliability of relay protection actions are raised. The residual magnetism can be removed on line, and the current transformer does not need to be out of service. No complicated signal detection circuits or control circuits are required, and the circuit is easy to realize. The error of residual magnetism of an iron core after demagnetizing is small, and the demagnetizing speed is high.

A system and method for magnetic levitation with a tilted orientation. In one embodiment, a magnetic levitation base together with a magnetic levitation affecting element that is located to the side of the levitation base support the magnetic levitation of a spinning magnetic top in a tilted orientation. The tilt angle of the levitating magnetic top may be greater than the tilt angle of the levitation base. In one embodiment, the levitation affecting element may comprise one or more magnets similar to that of the levitation base. The mass of the top and the tilt of the levitation base that are required for magnetic levitation may be adjusted by adjusting the levitation affecting element (e.g. altering its position and / or the strength of its magnetic field.) The general direction of the tilt may be reversed by changing the magnetic north-south direction (e.g. turning over or reversing the electromagnetic current) of the levitation affecting element.