115 results about "Coil inductance" patented technology

A method and system for measuring distribution network system parameters based on harmonic injection, for use in a low-current grounding system containing an arc suppression coil. The system injects currents of multiple frequencies into the neutral point of the low-current grounding system through an injection source and measures the neutral point voltage. The system uses formulas to calculate and obtain the line capacitance, arc suppression coil inductance, and damping resistance parameter values ​​in the distribution network system. This application can accurately measure line capacitance, arc suppression coil damping resistance, and reactance by injecting only two frequencies of current. This method has little impact on grid operation, high measurement accuracy, and broad application prospects.

A smart variable inductor based on magnetorheological materials comprises an "EE"-shaped iron core, two DC control coils, one AC coil, and a magnetorheological material gap. The magnetorheological material gap is located on the central column of the "EE"-shaped iron core. The two DC control coils and the AC coil are wound around the two side columns and the central column of the "EE"-shaped iron core, respectively. By controlling the DC current in the DC control coil, the magnetic saturation of the side columns can be changed, thus achieving intelligent wide-range adjustment of the inductance of the AC coil. The beneficial effects of this patent are: the provided smart variable inductor based on magnetorheological materials, due to the higher permeability of magnetorheological materials than air, which decreases with increasing magnetic field strength, has advantages such as a wide inductance adjustment range and low diffusion flux. When used in LLC resonant converters, it can achieve intelligent wide-range adjustment of input / output voltage and load, as well as intelligent current sharing control in multi-parallel converters.

A device which provides a measure of the compliance of a vessel wall based on a change in pressure, which causes the vessel to distend. The device comprises a coil and capacitor, forming a tank circuit. The coil is expandable and positioned along a portion of the vessel so that when the portion of the vessel expands or contracts, the coil will also expand or contract, changing the area inside the coil. This change in area alters the coil inductance, and therefore the resonant frequency of the tank circuit, which can be detected externally.

The invention provides an autonomous simulation system and method for dynamic characteristics of a low-voltage contactor. The system comprises a motion module, a circuit module and a finite element simulation module. The method comprises the following steps of: performing simulation calculation on the current position and the current current of the movable iron core of the contactor by using a finite element simulation module, transmitting data of the latest electromagnetic attraction suffered by the movable iron core of the contactor to a motion module, and transmitting a latest coil inductance value calculated according to a magnetic field to a circuit module. And the motion module calculates the displacement of the next time step according to the current resultant force and transmits the displacement to the finite element simulation module for real-time updating. And the circuit module calculates the current of the next time step according to the current inductance and current and outputs the current so as to carry out loop iteration of the next time step. According to the method, all possible coil current and movable iron core displacement do not need to be calculated once, so that the calculation efficiency is greatly improved.

The invention discloses a double-winding coil synchronous machining device for a transformer, and relates to the technical field of transformer coil machining. A guiding mechanism; the first winding assembly comprises a first lower seat body, the first lower seat body is arranged at the output end of the guiding and conveying mechanism, and a first winding module is arranged above the first lower seat body; the second winding assembly comprises a second lower seat body, the second lower seat body is arranged at the output end of the first winding assembly and on the two sides of the metal belt between the first lower seat body and the second lower seat body, and a second winding module is arranged above the second lower seat body; the transfer mechanism comprises a transfer table and a material supporting assembly; a cutting assembly; a discharging mechanism; according to the invention, the first winding can be automatically transferred to the transfer table, the first winding carries out a part of the reserved section, and the second winding assembly can wind the reserved section into the second winding, so that a single metal belt can be processed into a double-winding coil, and the voltage resistance of the inductor is higher.

The invention discloses a U-shaped coil inductor and a production method thereof, and the method comprises the following steps: S1, cutting a copper sheet into a required size through a punching machine, and bending the copper sheet into a U-shaped coil; s2, the U-shaped coil is placed on a lower punching die with the opening facing downwards, and an electrode of the U-shaped coil is placed in a groove of the lower punching die; s3, feeding the alloy powder into a mold, and applying pressure to press the alloy powder and the U-shaped coil into an inductor; s4, putting the inductor into an oven for baking; s5, uniformly covering the inductor with an organic coating through spraying equipment to form a protective layer; and S6, stripping the protective layer of the exposed electrode of the inductor by using laser, and plating a tin layer on the electrode through electroplating. The U-shaped coil has the beneficial effects that the U-shaped coil is formed by bending the copper sheet, the structure is simple, automatic generation and processing are facilitated, and the production efficiency is improved; the U-shaped coil and the magnetic powder block are pressed and integrally formed, the volume is small, the magnetic powder block can be easily integrated into a circuit, the design of the circuit is more compact, and the requirement for high integration of components is met.

The invention provides a concentric-square-shaped steel structure tower magnetic field energy taking device under an alternating-current power transmission line and a setting method of the concentric-square-shaped steel structure tower magnetic field energy taking device. The device comprises a magnetic induction energy taking assembly and an energy taking circuit, the magnetic induction energy taking assembly comprises a magnetic core and an energy taking coil, the magnetic core penetrates through the energy taking coil and is arranged on a concentric-square-shaped piece, and the two ends of the magnetic core make contact with the concentric-square-shaped piece; the energy taking coil is electrically connected with the energy taking circuit, the energy taking circuit is a resonant circuit, the resonant circuit comprises a resonant frequency adjusting assembly, and the resonant frequency adjusting assembly is used for dynamically adjusting the resonant frequency of the energy taking circuit according to the change of the inductance value of the energy taking coil, so that the energy taking circuit is kept in a resonant state. The magnetic field energy of the concentric-square-shaped steel structure tower can be converted into electric energy, and meanwhile the energy conversion efficiency can be further improved.

The utility model discloses a double-current alternating excitation circuit of an electromagnetic flowmeter. The circuit comprises a V / I conversion circuit A and a V / I conversion circuit B which are respectively used for converting the voltage of a voltage-stabilized direct-current power supply VCC1 and the voltage of a voltage-stabilized direct-current power supply VCC2 into current, and a current switching circuit which is used for switching and connecting the V / I conversion circuit A and the V / I conversion circuit B into a direction switching circuit, a direction switching circuit for switching a current switching circuit to a current direction and a CPU (Central Processing Unit) are used for switching the current of a V / I conversion circuit A and a V / I conversion circuit B which are accessed by controlling a current switching circuit Q and controlling the direction switching circuit to switch the direction of the current accessed by the current switching circuit, so that a coil of the sensor generates forward and reverse alternating excitation excitation; the problem of insufficient sampling time caused by inductance of a sensor coil can be avoided under high excitation frequency, heating of the excitation circuit can be effectively avoided, and the utilization efficiency of a power supply is improved.

The invention discloses a paper folding structure inductance type self-decoupling miniature six-dimensional force sensor, which belongs to the technical field of force sensors and comprises a base, a folding flexible circuit board, a metal shell, a communication cable, a coil inductance measuring circuit and an elastic body. The folding flexible circuit board comprises a coil array and an inductance measuring circuit, the coil array is folded on the upper surface and the four side faces of the base, the inductance measuring circuit is folded at the bottom of the base, and a communication cable is led out of the inductance measuring circuit. The metal shell is arranged above the base and surrounds the surface, except the bottom surface, of the folding flexible circuit board; an elastic body is arranged between the metal shell and the base. The elastomer converts six-dimensional force borne by the metal shell into six-dimensional displacement. According to the sensor, the characteristic that the eddy current effect is sensitive to normal displacement and insensitive to tangential displacement and rotation is utilized, self-decoupling measurement of six-dimensional displacement of the metal shell is achieved in combination with three-dimensional coil layout, and therefore self-decoupling six-dimensional force measurement is achieved, and the sensor can be integrated to the fingertip of the dexterous hand to provide endogenous tactile perception.

An eddy current detection probe and method capable of identifying any crack and direction around a hole, the probe comprising a cake-type detection coil with a central magnetic core, the magnetic core not only ensures accurate positioning, but also enhances magnetic fields inside and on the back of the hole by enhancing coil inductance to utilize a magnetic collection effect. The probe is further provided with three layers of exciting coils, the first layer of coil and the second layer of coil are arranged in an orthogonal mode, the included angle between the third layer of coil and the first layer of coil is 135 degrees, and efficient detection of cracks in any direction and recognition of any crack defect direction are achieved. The flexible support of the probe enables the probe to adapt to a curved surface structure, and the application range is widened. According to the detection method, an orthogonal difference technology is adopted, and the hole periphery defects are identified by using the symmetry of the hole structure, so that the detection sensitivity of the back and internal defects around the hole structure is remarkably improved. Compared with a traditional surface and near-surface defect eddy current detection technology, a more effective solution is provided for high-precision detection of the hole periphery structure through an innovative coil configuration and defect identification method.

The invention relates to a method for calculating the power-on and power-off delay time performance of an electromagnetic valve, and the method comprises the following steps: obtaining the mass of a valve element of the electromagnetic valve, the spring stiffness and coil resistance data; establishing an electromagnetic valve equivalent circuit model, and listing a current equation; establishing an electromagnetic valve magnetic circuit mathematical model, and listing a magnetic field equation set; establishing an electromagnetic valve flow field mathematical model, and listing a flow field equation set; establishing a kinematic model of the electromagnetic valve, and listing a kinematic equation; using a finite element method to obtain a valve core electromagnetic force-displacement-current data table and a coil inductance-displacement-current data table; a finite element method is used for obtaining a valve element aerodynamic force-displacement data table; and obtaining the power-on and power-off delay time through data analysis processing and solving of the partial differential equation set. According to the method, prediction of the opening and closing delay response time of the electromagnetic valve is more accurate, visual adjustment in the simulation process is achieved, and the time for obtaining the response time of the electromagnetic valve and the test cost are greatly reduced while the preset precision requirement is met.

The invention discloses coil inductance detection equipment with a multi-angle polarization simulation function, and relates to the technical field of coil detection, and the detection equipment simulates a polarization effect through arranging three vibration units with mutually vertical vibration directions below a mounting seat. By controlling the vibration intensity in three directions and changing the included angle between the two vibration units in the horizontal direction, polarization of multiple angles and various different polarization are simulated, the control mechanism controls the adjusting mechanism according to the change of the magnetic field of the coil in the vibration process, the vibration intensity is dynamically adjusted through the adjusting mechanism, and the vibration intensity is adjusted. Therefore, the influence of vibration on inductance change when the coil works and the influence of reverse coil change on vibration are simulated, closed-loop feedback is formed, and the detection precision is improved.

The invention provides a millimeter wave radio frequency power amplifier and a millimeter wave radio frequency transceiver, in the amplifier, an input differential signal is connected to grid electrodes of an amplification tube pair transistor and an auxiliary tube pair transistor through an auxiliary tube pair transistor blocking capacitor and an amplification tube pair transistor blocking capacitor; source electrodes of the auxiliary tube pair tube and the amplifier tube pair tube are grounded. The first amplifier tube is connected with the drain electrode of the first common-gate tube and the source electrode of the first auxiliary tube; the second amplifier tube is connected with the drain electrode of the second common-gate tube and the source electrode of the second auxiliary tube; grid electrodes of the common-gate pair transistors are connected; common-gate tube grid bias voltage is connected to grids of the common-gate tube geminate transistors through the bias resistor, and the other end of the grounding capacitor is connected to the grids of the common-gate tube geminate transistors; the drain electrode of the common-gate pair transistor is connected to the shunt capacitor and the main coil inductor of the output balun, and the secondary coil inductor of the output balun is connected with a single-ended output signal. According to the radio frequency power amplifier, OP1dB of the radio frequency power amplifier can be improved under the condition that the working voltage of the power amplifier is not increased.

A kind of eddy current testing probe and method for identifying any crack and direction around hole, the probe includes a pie-shaped detection coil with middle magnetic core, the magnetic core not only ensures accurate positioning, but also uses magnetic collection effect by enhancing coil inductance, to strengthen the magnetic field inside and back of hole.The probe is also equipped with three layers of excitation coil, one layer and two layers of coil are arranged orthogonally, three layers and one layer of coil are at an angle of 135 °, realize the efficient detection of any direction crack and identify the direction of any crack defect.The flexible support of probe enables it to adapt to curved surface structure, widen the application range.The detection method uses orthogonal differential technology, uses the symmetry of hole structure to identify defects around hole, significantly improve the detection sensitivity of defects on the back and inside of hole structure.Compared with traditional surface and near-surface defect eddy current testing technology, the present application provides a more effective solution for high-precision detection of hole structure through innovative coil configuration and defect identification method.

The invention discloses a rectangular coil inductance modeling design method based on an improved mirror current method, and the method specifically comprises the following steps: 1, calculating a coil self-inductance value Lcore and a coil mutual inductance value Mcore under the condition of no magnetic core based on a rectangular coil geometric model; 2, calculating a self-inductance value of the coil with the magnetic core; and 3, calculating the mutual inductance value of the coil with the magnetic core. According to the method, the problem of large inductance error caused by a traditional coil modeling method is solved.

A pinless power plug for receiving wireless power from a pinless power jack comprises at least one secondary coil for inductively coupling with a primary coil. The pinless power plug comprises a first magnet, having an annular shape, arranged around a perimeter of the at least one secondary coil concentric and non-overlapping with the at least one secondary coil. The first magnet is configured to magnetically couple with a second magnet in the pinless power jack. The pinless power plug comprises a third magnet spaced away from and outside of the first magnet. The third magnet is configured to magnetically couple with a fourth magnet in the pinless power jack at a particular orientation.

Suppressing noise caused by motor switching. [Solution] A vacuum pump comprising a rotating body, a motor that rotates the rotating body, a radial electromagnet that generates a radial electromagnetic force on the rotating body, a displacement sensor having multiple sensor poles made of coils and measuring the displacement of the rotating body based on changes in the inductance of the coils, a power converter that converts an input DC voltage into an AC voltage to be applied to the motor, a motor driver that performs PWM control in cooperation with the power converter, an oscillator that outputs an AC voltage as a modulated input signal to the displacement sensor, and a demodulation circuit that demodulates the output signal from the displacement sensor using a synchronous detection method, wherein the carrier frequency in PWM control is four times the modulation frequency of the displacement sensor.

The invention discloses an auxiliary device and method for rapidly determining three parameters of soft magnetic composite powder, and belongs to the technical field of soft magnetic material performance testing. The invention provides a simple device and method based on a medical injector and an insulated copper wire, aiming at solving the problems that a traditional testing method depends on complex equipment, steps are tedious, the cost is high and the efficiency is low. By measuring the inductance and the resistance of the coil and combining calculation of the size of an inner cavity of the injector and the length of a magnetic circuit, the quality factor, the effective magnetic conductivity and the direct-current bias of the soft magnetic powder can be quickly and accurately calculated. The device is simple in structure, mainly comprises an injector, an insulated copper wire, soft magnetic powder and an insulated rubber tape or transparent adhesive tape, and is convenient to operate and low in cost. The method is especially suitable for rapid quality detection of a production field and preliminary performance evaluation of a laboratory, can significantly improve the test efficiency and reduce the test cost, and has the advantages of simplicity, rapidness, low cost and high applicability.

The utility model relates to the technical field of welding, and discloses a weld joint single-face induction heating device, which comprises at least one induction working part, the induction working part is controlled by a control cabinet to work, the induction working part comprises an induction coil and a framework for supporting the induction coil, an electric wire in the induction coil is a nickel-plated copper wire, and the framework is arranged in the nickel-plated copper wire. The framework is laid on a workpiece, and the induction coil is aligned with a working part and starts to act after being electrified, so that the working part is induced to automatically heat. The bendable framework is adopted, so that the surface of a weld joint is better attached; by adopting the double-layer wound coil, the inductance range of the single coil can be effectively expanded under the condition that the wire diameter is not increased, so that the maximum output power of the single coil is improved; nickel-plated copper wires are adopted, the coil temperature is effectively reduced by about 100 DEG C, and the effect is obvious; the temperature difference between the inner side and the outer side of the welding seam in the stable heat preservation process meets the process requirement.

The utility model belongs to the technical field of inductor manufacturing, and particularly relates to a multilayer metal coil inductor which comprises an outer shell, a magnetic core and a coil, the magnetic core and the coil are arranged in the outer shell, the coil is arranged on the periphery of the magnetic core, and the outer shell comprises a lower shell body and an upper shell body. The lower shell body and the upper shell body are connected in an involution mode to form an installation cavity to contain a coil and a magnetic core, and the upper surface and the lower surface of the outer shell are each provided with a plurality of heat dissipation areas which are arranged in an annular array mode. The upper surface and the lower surface of the shell of the inductor are provided with a plurality of heat dissipation areas, the heat dissipation of the inductor is facilitated, and the heat dissipation areas are arranged in an annular array, so that the shell is ensured to provide support and protection for the coil and the magnetic core, and air circulation is also facilitated for heat dissipation.

The invention relates to the technical field of superconducting magnet design optimization, and discloses a superconducting magnet coil design method, a superconducting magnet coil design device, superconducting magnet coil design equipment, a medium and a product. The plurality of optimization targets comprise at least two items of coil center magnetic field intensity, magnetic field uniformity of a coil target area, coil inductance and coil material consumption; acquiring an initial setting range of a plurality of coil design parameters; constructing a plurality of fitness functions according to the plurality of optimization targets; and in the initial setting range of the multiple coil design parameters, the multiple coil design parameters are optimized based on the multiple fitness functions, a target coil design parameter combination is obtained, and the target coil design parameter combination is a configuration scheme of the multiple coil design parameters meeting the constraint conditions of the multiple optimization targets. According to the method, comprehensive automatic optimization of multiple performance indexes such as magnetic field intensity, uniformity, inductance and material consumption in superconducting magnet coil design is realized.

The utility model relates to electronic components technical field especially relates to a choke coil inductor, the utility model discloses the protrusion that extends along the radial is arranged at two corners of base body, the threading hole along the axial is seted up on the protrusion, and the both ends of coil extend to two protrusions along the radial respectively, and the one end of two electronic wires respectively passes threading hole and is electrically connected with the both ends of coil, and such design can increase the distance between the two lead ends of coil, and the insulation performance and reliability of inductor are improved significantly, and the corona discharge problem under high pressure environment is avoided.

Systems and devices for wireless power transmission is provided. A system includes a ground assembly and a vehicle assembly. The ground assembly includes a primary coil and a magnetic permeable core. The vehicle assembly includes a secondary coil capable of being inductively coupled to the primary coil and one or more magnetic permeable wings disposed on top of the secondary coil. Each of the one or more magnetic permeable wings overlap the secondary coil such that each of the one or more magnetic permeable wings extend within and beyond a periphery of the secondary coil for generating additional coupling between the primary coil and the secondary coil.

The present invention relates to an electrical machine (1) with a stator (2) and a rotor shaft (4) mounted on the stator so as to be rotatably adjustable about a rotational axis (3), with a primary coil (5) arranged on the stator (2) and a secondary coil (6) arranged on the rotor shaft (4), which is inductively coupled to the primary coil (5) during operation of the electrical machine (1) so that electrical energy is transferred from the primary coil (5) to the secondary coil (6). It is essential for the invention that the electronic rectifier components (9) of a rectifier device (7) are arranged within a receptacle (15) of a rectifier housing (8) of the rectifier device (7) and are indirectly cooled by cooling channels (17) of the rectifier housing (8).

The utility model relates to an adjustable impedance matcher applied to a PVD (Physical Vapor Deposition) pre-cleaning process. The adjustable impedance matcher comprises a cavity shell, a coil inductor, a capacitor assembly and a radio frequency source connecting port, a coil inductor is installed on the inner side wall of the cavity shell, and a capacitor assembly is installed at the bottom in the cavity shell. The capacitor assembly comprises two capacitor installation bases distributed in the front-back direction, the chip capacitor C is installed on a chip capacitor installation base, and the front end and the rear end of the chip capacitor installation base are installed on the two chip capacitor installation bases respectively. According to the utility model, by adopting the matching network with a fixed structure, the design is more concise, the cost is lower, the adaptability is stronger, different capacitors are adopted for matching according to the frequency change, the operation is simple, the controllability is strong, and the troubleshooting is convenient.

The invention relates to the technical field of power protection, and discloses a dynamic compensation switching method based on a grounding transformer arc suppression coil. The method comprises the following steps: collecting zero-sequence voltage, zero-sequence current and line impedance of a photovoltaic system in real time through a multi-branch collector to obtain a power grid operation state parameter set; according to the phase relationship between the zero-sequence current and the zero-sequence voltage, identifying a photovoltaic internal fault through a fault direction discrimination algorithm; inputting the fault confirmation signal into an arc suppression coil inductance adjusting system, and dynamically calculating a compensation inductance parameter according to the capacitive current of the fault point; the inductance of the arc suppression coil is adjusted through the combination of the graded reactors controlled by the thyristors, so that the inductive current and the capacitive current are counteracted with each other, and the grounding arc is extinguished. The technical problems that a traditional arc suppression coil cannot distinguish photovoltaic internal and external faults, compensation parameters are fixed and the response speed is low are solved, and the accuracy of ground fault processing and the dynamic response capability of compensation switching are improved.

An inductive wireless power transfer and communication system includes an electrostatic shield for one of the coils. The electrostatic shield is inductively coupled with the coil and is configured as an open circuit. A signal processing element or elements, especially a modulator or a demodulator, are connected across the electrical discontinuity in the electrostatic shield. Because the electrostatic shield is inductively coupled to the coil, the modulator or demodulator can operate on the signal on the coil. An electronically controlled variable inductor is connected across the electrical discontinuity in the electrostatic shield. Because the electrostatic shield is inductively coupled to the coil, the variable inductor can tune the impedance of the system.

Embodiments herein relate to a clock distribution network. In one aspect, the network includes a resonant transmission line-based architecture which includes a single inductive-capacitance (LC) termination along the distribution and an additional capacitive termination at the end of the distribution to independently tune the primary and secondary resonance frequencies of the network and perform 3rd-harmonic filtering. The LC termination can include a coil inductor or a short-circuited termination line with parallel conductors to provide an inductance.

The utility model relates to electromagnetic heating technical field discloses series connection type helical coil array's electromagnetic heating coil disc, including support board, the top fixed connection of support board has a plurality of coil framework combinations, the inside installation of coil framework combination has heating assembly, the bottom mounting of support board has supplementary assembly, heating assembly includes helical coil, helical coil installs in the inside of coil framework combination, and it is series connection between a plurality of helical coils, supplementary assembly includes magnetic stripe combination, and the bottom mounting of magnetic stripe combination in support board, in the utility model, when heating, the utensil is placed on the isolation mica piece, and the helical coil that starts series connection and close arrangement can rapidly produce uniform magnetic field, realizes wide -range uniform heating, reduces local overheating or deficiency. The magnetic stripe combination can increase coil inductance, gather magnetic force line, reduce leakage magnetism, improve efficiency and reduce interference, and can also supplement energy and increase output.

The invention provides a reservoir stability monitoring device and method in the natural gas hydrate exploitation process. The monitoring device comprises a monitoring well, an electromagnetic induction coil and a measuring circuit. The electromagnetic induction coil is wound on a shaft of the monitoring well, and the measuring circuit is electrically connected with the two ends of the electromagnetic induction coil; according to the electromagnetic induction principle, measured non-electric quantity such as displacement, strain, pressure, flow, vibration and the like is converted into the change of the inductance value of the electromagnetic induction coil, so that sensing monitoring is carried out; according to the measurement method, the monitoring device is longitudinally fixed on the submarine landslide slope. According to the monitoring device and the monitoring method, measured non-electric quantity such as displacement, strain, pressure, flow, vibration and the like is converted into change of coil inductance for monitoring by utilizing an electromagnetic induction principle. The coil with tensile strength is adopted, so that the coil can be deformed in a large range, and the inductance type monitoring device has the characteristic of large strain and is suitable for submarine landslide deformation monitoring.