40 results about "Coil inductance" patented technology

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.

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.

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 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.

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 present invention addresses the problem of providing a position sensor that can accurately measure the distance to an object to be measured. [Solution] The position sensor includes a detection coil disposed opposite the object to be measured, a temperature sensor, an oscillator, a processing unit, and a storage device. The oscillator outputs an oscillation signal having a frequency corresponding to the inductance of the detection coil. The temperature sensor outputs a measurement signal corresponding to the temperature of the detection coil. The storage device stores correlation data indicating the relationship between the distance between the object to be measured and the detection coil, the frequency, and the temperature of the detection coil. The processing unit receives the oscillation signal and the measurement signal, and outputs the distance based on the correlation data.

The application discloses a paper folding structure inductive self-decoupling micro six-dimensional force sensor, and belongs to the technical field of force sensors. The paper folding structure inductive self-decoupling micro six-dimensional force sensor comprises a base, a folded flexible circuit board, a metal shell, a communication cable, a coil inductance measurement circuit and an elastomer. The folded flexible circuit board comprises a coil array and an inductance measurement circuit. The coil array is folded on the upper surface and four side surfaces of the base. The inductance measurement circuit is folded on the bottom of the base and leads out the communication cable. The metal shell is arranged above the base and surrounds the surfaces of the folded flexible circuit board except the bottom surface. The elastomer is arranged between the metal shell and the base. The elastomer converts the six-dimensional force borne by the metal shell into six-dimensional displacement. The sensor is sensitive to the normal displacement and insensitive to the tangential displacement and rotation by utilizing the eddy current effect, and realizes the self-decoupling measurement of the six-dimensional displacement of the metal shell by combining the three-dimensional coil layout, so that the self-decoupling six-dimensional force measurement is realized. The sensor can be integrated into a dexterous finger tip to provide endogenous tactile perception.

The invention discloses an integrated LC radio frequency power assembly and a radio frequency power supply with the same, and belongs to the technical field of radio frequency power assemblies and radio frequency power supplies. The integrated LC radio frequency power assembly comprises a multi-layer structure and a magnetizer; the multi-layer structure comprises at least two conductor layers which are arranged in a stacked mode, a dielectric layer is arranged between every two adjacent conductor layers, and a capacitor C is formed by the adjacent conductor layers and the dielectric layer between the adjacent conductor layers; the conductor layer and the magnetizer form an inductor L; and the magnetizer is sleeved outside the multi-layer structure and is used for gathering a magnetic field around the conductor layer and enhancing the inductance value of the conductor layer. Capacitance is formed among multiple layers of conductors, the use number of high-voltage, high-frequency and high-Q-value chip capacitors is reduced, a magnetizer is adopted to increase the inductance value of the conductor with the specific length to replace a coil inductor, the inductor and the capacitor are integrated, the circuit size and the circuit board area are reduced, and cost is reduced; the invention also has the advantages of interference resistance, high efficiency, high power, reduced heat dissipation requirement, no winding process and the like.

The invention discloses an energy storage converter-oriented bridge resonance compensation circuit parameter optimization method and system. The method comprises the steps of constructing a multi-target nonlinear programming model; according to the model, primary / secondary resonance coil inductance values and compensation inductance values are taken as optimization variables, the maximum system output power and the minimum electrical stress sum of key elements are taken as a target function, and the system output power, the system transmission efficiency, the element electrical stress and the number of turns of resonance coils are taken as constraint conditions; solving the multi-objective nonlinear programming model by adopting a multi-objective optimization algorithm to obtain a Pareto optimal solution set containing a plurality of non-dominated solutions; and selecting a group of optimization variable values from the Pareto optimal solution set as final parameters of the bridge type resonance compensation circuit. The method has the advantages of effectively coordinating the conflict between the maximization of the output power of the system and the minimization of the electrical stress of the key element, improving the safety and the transmission efficiency of the system, and meeting multiple engineering constraints at the same time.

The invention discloses an SQUID-based inner centering superconductive gravity measurement device and method, and belongs to the technical field of gravity measurement, the device comprises an SQUID, an input coil, a detection cavity, a superconductive suspension body, a torquer cavity, a suspension coil and a coil support base which are arranged from top to bottom; the input coil and the detection coil are in superconducting connection to form a detection loop; the detection coil induces the vertical displacement of the superconducting suspension body and converts the vertical displacement into a current signal, and the current signal is coupled to the input coil in magnetic flux coupling with the SQUID through the detection loop; the SQUID converts the magnetic flux change into a voltage signal and outputs the voltage signal, so that high-precision detection of displacement is realized; a detection coil is arranged in the detection cavity, and a torquer is arranged in the torquer cavity; different currents are introduced into the first torque superconducting loop and the second torque superconducting loop of the torquer, so that the inclination state of the superconducting suspension body is adjusted. According to the invention, the problem of poor stability of high-precision dynamic gravity measurement is effectively solved.

The present invention relates to a fault signal detection system of target equipment using a resonance filter, which can precisely detect a fault signal of a coil in the target equipment regardless of frequency resolution, and can greatly improve a signal-to-noise ratio. To this end, provided is a detection device which detects a fault signal that may occur in a target coil (30) of the target equipment, comprising: a tuning capacitor (150) which is connected in series between a coil power source (120) and a coil inductor (160) with respect to a coil power source (120), the coil inductor (160), and a coil resistor (180) of the target coil (30), and is capable of tuning a frequency of the resonance filter; and a matching capacitor (140) which is connected to the coil power source (120) in parallel and can be matched with the frequency of the resonance filter, and thereby, a signal-to-noise ratio (SNR) may be further increased when the fault signal in the frequency domain passes through the resonance filter.

The utility model discloses a variable inductor with continuously adjustable inductance, and relates to the technical field of inductors. The two sides of the top of the base are provided with a first motor and a second motor respectively, the top of the base is connected with two frameworks, an induction coil is connected between the two frameworks, one side of one framework is connected with a first rotating disc, and one side of the other framework is connected with a second rotating disc. By arranging the lead screw, the threaded sleeve and the outer iron core, the lead screw is driven to rotate through the output end of the second motor, the threaded sleeve drives the third supporting barrel to move towards the second supporting barrel through guiding of the guide rod, the distance between the third supporting barrel and the second supporting barrel is changed, and the amplitude of opening the outer iron core by the connecting rod is controlled; and the distance between the outer iron core and the induction coil is further controlled, so that the inductance value of the induction coil is changed by changing the relative position of the outer iron core and the induction coil.

The application relates to a double-load wireless power transmission rectangular coil construction method, which is characterized by a transmission coil inductance target value range, a receiving coil inductance target value range and a receiving coil external size target length-width ratio value range q To meet the requirements, specific steps A to D are performed, a mathematical model of the size relationship between the transmission coil and the receiving coil is constructed, a data surface model containing each turn surface under network training is constructed, the relationship between the two is combined, and the transmission coil and the receiving coil meeting the preset requirements are constructed. The whole design can effectively improve the accuracy and standardization of the coil design, and has important application value in the design of a multi-load wireless power transmission system.

Embodiments of a multifilar inductor with at least three windings that are switchable, having a power assigned winding denoted as P1, a suppression assigned winding denoted as B, a containment assigned winding denoted as T, a switching apparatus to switch assignments between the P1, B and T windings; and a capacitor bank, wherein B suppresses the back EMF generated by a pulse power, T contains field emitted EMF generated by the pulse power. The input pulse power input is converted to a constant current output into the capacitor bank such that its time duration is extended by the combination of the inductor windings plus the capacitor bank to thereby minimize the peak inductance below the inductor's saturation point.

The present disclosure describes methods and apparatus for detecting an aging condition of a hydrogen sparger. According to one aspect of the present disclosure, a method includes determining a coil inductance value and a circuit resistance value of a hydrogen sparger in an anode subsystem of a fuel cell system when the fuel cell system is in a reference operating condition; comparing the coil inductance value and the circuit resistance value to a coil inductance reference value and a circuit resistance reference value corresponding to the reference operating condition; and determining an aging condition of the hydrogen sparger based on a result of the comparison.

The invention relates to the technical field of nuclear power fuel pool edge detection, and provides an ultra-thin nuclear fuel oxidation film eddy current detection probe which comprises a thin sheet base body used for being inserted into a fuel assembly, one end of the thin sheet base body is connected with an elastic sheet, and a detection piece attached to the surface of a fuel rod is installed on the elastic sheet. The detection piece comprises a magnetic core, a detection coil and a shielding layer, the detection coil is wound outside the magnetic core, the shielding layer wraps the magnetic core and the detection coil, the other end of the sheet base body is provided with a connector used for being externally connected with an eddy current instrument, and the detection coil is connected with the connector through a cable. A thin sheet base body capable of being inserted into a fuel assembly serves as a carrier, a detection piece comprising a magnetic core, a detection coil and a shielding layer is attached to a fuel rod through an elastic piece, a connector is connected through a cable, and then the detection piece is externally connected with an eddy current instrument, so that a probe extends into a narrow gap in the fuel assembly, coil inductance is improved, electromagnetic interference is resisted, and a deepwater high-level environment is adapted. The problems of detection adaptability and precision of the narrow gap in the fuel assembly are solved.

The utility model discloses an inductance device and an inverter, the inductance device comprises a coil, the inductance device further comprises a bottom plate, the bottom plate is made of an insulating material, the bottom plate comprises a mounting part, and the mounting part is used for mounting the coil; moreover, the bottom plate is provided with an installation hole, the bottom plate is installed at a preselected position through the installation hole, and the coil of the inductance device is electrically connected with the PCB through a wire. According to the inductance device provided by the invention, the area required by mounting the inductance device on equipment can be reduced, and the influence on the mounting of other parts on a PCB (Printed Circuit Board) is avoided.

The invention discloses a large-current distributed coil inductor winding method and device, and the method comprises the steps: obtaining a current parameter and a frequency parameter of a target inductor, carrying out the shunting planning and skin depth constraint analysis, and determining a conductor configuration scheme; conducting wire specification matching according to the number of parallel conductors and the upper limit of the cross section of a single conductor, determining a target wire specification after bending radius checking, and constructing a to-be-wound wire group; a to-be-wound wire group is wound on a magnetic core side by side in the same direction to form an initial winding, the initial winding is arranged in a layered mode, gradient spacing is configured according to the principle that the inner part is sparse and the outer part is dense, and conductor transposition is executed through cyclic displacement to form a distributed winding; symmetrical confluence connection is carried out on the starting ends and the terminating ends of the wires respectively to form input end parallel nodes and output end parallel nodes, a current sharing state is formed through branch impedance equalization, large-current distributed coil inductors are output in an integrated mode, and the problems that branch impedance in a multi-conductor winding is unbalanced, current distribution is uneven, and heat dissipation of an inner layer is not smooth are solved.

The application relates to the field of simulation, in particular to a method for modeling a magnetic suspension object by using a double system and a simulation device. The model data generation module comprises a dynamic model and a control model, the model data generation module realizes data model code generation and downloads to an embedded development board for real-time simulation operation, the model data generation module transmits characteristic parameters to the embedded development board before simulation, the characteristic parameters include the mass of the magnetic suspension object, the coil resistance, the coil inductance, the magnetic force-current coefficient, the magnetic force-position coefficient, the initial position of the magnetic suspension object, and real-time coil voltage parameters are continuously given; the embedded development board receives the displacement of the magnetic suspension object, the coil current and the coil voltage in real time by running the method for modeling the magnetic suspension object by using the double system, calculates the displacement of the magnetic suspension object and the coil current at the next moment, feeds back the calculated displacement of the magnetic suspension object and the coil current at the next moment to a simulation platform, and the simulation platform performs simulation display. The application can more directly observe the relationship between the current and the position information.

The present application belongs to the field of rail transit technology, and particularly relates to a kind of calculation method and model of hollow coil inductance value of track circuit, for solving the problem that the geometric size of hollow coil itself is larger, if enough far place is selected as the boundary of field, the calculation amount of vector magnetic potential A is very large, the calculation time is long, and the calculation accuracy cannot be guaranteed.The present scheme selects a calculation field for the inductance of hollow coil, and gives the determination method of vector magnetic potential A on the outer boundary, reducing the calculation amount of inductance value.Compared with the prior art, the present application avoids the problem of too large outer boundary, the calculation amount of vector magnetic potential A is small, the calculation is fast, and the calculation accuracy is effectively guaranteed, which contributes to the stability of track circuit and the safe operation of train.

The utility model provides a kind of clamp magnetic ring device and winding machine, wherein, clamp magnetic ring device includes mounting seat and be set on mounting seat and be used for the first clamp magnetic ring component for clamping magnetic ring circumferential two ends;First clamp magnetic ring component includes a pair of magnetic ring clamp;Magnetic ring clamp includes first abutment and a pair of second abutment, and the width of second abutment on magnetic ring axial end face is 0.3mm-20mm.The utility model provides a kind of clamp magnetic ring device by a pair of magnetic ring clamp limit winding area, ensure that unit wire is wound in specified area, to ensure that the density and tightness of coil reach design requirement;First clamp magnetic ring component is applicable to different inductance processing by controlling the width of second abutment, when winding single-coil inductance, try to reduce the space of magnetic ring winding position occupied by magnetic ring clamp, reduce the influence of magnetic ring clamp to wire winding, to ensure the uniformity and consistency of coil winding on magnetic ring, to improve winding quality.

The invention discloses a low-voltage high-magnetic-moment transient electromagnetic emission mechanism and method based on multi-parallel coil and single H bridge driving, and belongs to the technical field of emission systems. The low-voltage high-magnetic-moment transient electromagnetic emission mechanism comprises an emission control unit and an isolation driving unit connected with the emission control unit; the power driving unit is connected with the isolation driving unit, the H-bridge power output unit is connected with the power driving unit, and the parallel coil load unit is connected with the H-bridge power output unit. The parallel coil load unit is composed of a plurality of sub-coils, the parameters of the sub-coils are consistent, and the two ends of the sub-coils are connected to the output end of the H-bridge power output unit in parallel. According to the invention, a single H bridge drives multiple coils to be connected in parallel, and the inductance of the parallel coils is optimized, so that the problems of difficulty in maintaining magnetic moment output, inductance reduction, steep falling edge, heat dissipation optimization, driver number simplification and the like under low voltage are solved, and the launching mechanism which still maintains equivalent magnetic moment output under low driving voltage is realized.

A current control type magnetic valve flexible inductor is composed of an "EE" shaped core, two direct current control coils and an alternating current coil; two magnetic valves are formed on two side columns of the "EE" shaped core, and an air gap is formed on the middle column of the "EE" shaped core; the two direct current control coils are wound on the two side columns of the "EE" shaped core respectively, and the alternating current coil is wound on the middle column of the "EE" shaped core; the two direct current control coils are connected in series and pass through a direct current control current; the size of the direct current control current is adjusted to change the magnetic saturation degree of the two magnetic valves, so that the inductance of the alternating current coil is adjusted in a super wide range. The flexible inductor has the advantages of less direct current control coil turns, small current, large alternating current coil inductance adjustment range and the like, and is used in an LLC resonant converter to realize super wide input and output voltage range adjustment and super wide load range adjustment of the converter, and current sharing control of a multi-path parallel converter.

To provide a magnetic disk device capable of obtaining coil resistance of a voice coil motor, and a control method thereof.SOLUTION: The speed of a magnetic head during a seek is detected. During seek acceleration, a back-EMF voltage is estimated to be induced in a coil of a voice coil motor based on the detected speed and the position of the seek. Then, during seek acceleration, the inductance voltage that is induced in the inductance component of the coil of the voice coil motor is obtained from the drive current of the voice coil motor, and the resistance of the coil of the voice coil motor is estimated based on the obtained inductance voltage, the drive voltage of the voice coil motor, the drive current of the voice coil motor, and the estimated back-EMF voltage.SELECTED DRAWING: Figure 1

The invention belongs to the field of energy collection, and discloses a high-power-density space stray magnetic field energy collection device which comprises a collector body, a compensation network, a rectifier bridge and a power management circuit. The collector body is composed of an H-shaped composite magnetic core and a coil, the H-shaped composite magnetic core comprises a magnetic flux collector and a middle magnetic column, and the cross section area of the magnetic flux collector is larger than that of the middle magnetic column; the coil is tightly wound on the periphery of the middle magnetic column, and the axial length of the coil does not exceed the axial length of the middle magnetic column; the compensation network and the coil inductor form resonance to suppress reactive power, the rectifier bridge is used for converting alternating current output by the coil into direct current, and the power management circuit is used for processing direct current electric energy and then supplying power to a rear-end load.

The invention relates to a feedback control photovoltaic relay mechanical state non-intrusive online mode identification method. The method comprises the following steps: sampling coil current and coil voltage of a photovoltaic relay in real time; on the basis of the sampling data, the coil resistance average value and the coil inductance are updated cycle by cycle, and then discretized coil current linear prediction is carried out; inputting the coil current characteristics into a mechanical state error recognizer, and performing nonlinear prediction on noisy coil current caused by non-sudden mechanical state change; adding the linear predicted value and the nonlinear predicted value to construct a real-time reference signal; a previous period reference signal is obtained through a memory module; subtraction is carried out on the reference signal of the previous period and the currently sampled coil current, and the subtraction is multiplied by the currently sampled coil voltage to obtain a power error; and through comparison of the power error and the error overflow threshold value, the mechanical state mode of the photovoltaic relay can be identified on line only by sampling the coil current and the coil voltage in real time without an intrusive sensor.

The application discloses an integrated LC radio frequency power component and a radio frequency power supply with the same, and belongs to the technical fields of radio frequency power components and radio frequency power supplies.The integrated LC radio frequency power component comprises a multilayer structure and a magnetic conductor.The multilayer structure comprises at least two conductor layers which are arranged in a stack, and a dielectric layer is arranged between any two adjacent conductor layers, and the adjacent conductor layers and the dielectric layer therebetween form a capacitor C.The conductor layers and the magnetic conductor form an inductor L.The magnetic conductor is arranged outside the multilayer structure, and the magnetic conductor is used for gathering the magnetic field around the conductor layers and enhancing the inductance of the conductor layers.The application adopts the multilayer conductors to form capacitors, thereby reducing the number of high-voltage high-frequency high-Q patch capacitors, adopts the magnetic conductor to increase the inductance of the conductors with a specific length to replace the inductance of a coil, integrates the inductance and the capacitor, thereby reducing the volume of the circuit and the area of the circuit board, and reducing the cost.The application also has the advantages of anti-interference, high efficiency, high power, reduced heat dissipation requirement, and no winding process.

The utility model discloses a carrier structure and VCM motor relates to VCM motor technical field, including carrier, be equipped with the winding groove for arranging copper wire on the carrier, the winding groove is with carrier center as the center of circle and is distributed in the concentric circle, and the copper wire for arranging symmetrical OIS coil forms annular magnetic circuit. Advantageous effect: through the winding groove of concentric circle distribution can guide copper wire to form annular magnetic circuit, solve the problem that traditional linear winding groove cannot satisfy annular wiring demand, avoid copper wire cross winding or stress concentration. The trapezoidal or circular arc section of winding groove and the setting of insulating boss at the same time divide winding groove into independent wiring area, make annular area wiring more orderly, effectively improve the problem that coil inductance distribution is uneven, and then improve OIS anti -shake precision and motor response speed.

The application relates to the technical field of power protection, and discloses a grounding transformer arc suppression coil dynamic compensation switching method. The method comprises the following steps: acquiring photovoltaic system zero sequence voltage, zero sequence current and line impedance in real time through a multi-branch collector to obtain a power grid operation state parameter set; identifying an internal photovoltaic fault through a fault direction discrimination algorithm according to the phase relationship between the zero sequence current and the zero sequence voltage; inputting a fault confirmation signal into an arc suppression coil inductance adjustment system, and dynamically calculating compensation inductance parameters according to the capacitive current at the fault point; and adjusting the inductance of the arc suppression coil through a thyristor-controlled hierarchical reactor combination to make the inductive current and the capacitive current offset each other, so that the grounding arc is extinguished. The application solves the technical problems that the traditional arc suppression coil cannot distinguish between internal and external photovoltaic faults, the compensation parameters are fixed, and the response speed is slow, and improves the accuracy of grounding fault processing and the dynamic response capability of compensation switching.