66 results about "Magnetic inductance" patented technology

The invention discloses an energy-saving gear pump with an intelligent flow adjusting function, and relates to the technical field of gear pumps. Comprising a machine base, a front cover and a rear cover are arranged on the left side and the right side of the machine base respectively, a liquid inlet and a liquid outlet are formed in the front side and the rear side of the machine base respectively, a driving gear and a driven gear meshed with each other are installed in the machine base, and floating side plates are arranged on the front cover and the rear cover; a conical disc is rotatably mounted on the inner side of the liquid inlet; two groups of coils are mounted on the outer side of the liquid outlet; two groups of electrodes are arranged in the liquid outlet; a sieve plate is mounted on one sides of the two groups of electrodes; liquid cuts magnetic induction lines in the magnetic field range of the two sets of coils, induced electromotive force is generated on the two sets of electrodes, the control system processes and calculates the induced electromotive force, then flow data are obtained, and intelligent flow adjustment of the gear pump is achieved.

The invention relates to a magnetic inductive flow meter (1), comprising: - a measurement tube (2) for conducting the medium, the measurement tube (2) being divided by a longitudinal plane (LE) into a first side and a second side, and the measurement tube (2) having an outer lateral surface; - a magnetic-field-generating device (3), said magnetic-field-generating device (3) comprising: at least one saddle coil (4), the saddle coil (4) being disposed on the outer lateral surface, wherein a coil wire of the saddle coil (4) delimits a saddle-coil interior (5), and a saddle-coil core assembly (6) having at least one saddle-coil core (7), the saddle-coil core assembly (6) being disposed in the saddle-coil interior (5), wherein a central angle α in a cross-section through the magnetic inductive flow meter (1) spans a minimum circle sector in which the saddle-coil core assembly (6) is disposed, wherein the following applies to the central angle α: 10 ≤ α ≤ 50; and - at least four measurement electrodes (11, 12, 13, 14), at least two (11, 13) of the at least four measurement electrodes (11, 12, 13, 14) being disposed on the first side and likewise at least two (12, 14) of the at least four measurement electrodes (11, 12, 13, 14) being disposed on the second side, wherein a central angle β spans a minimum circle sector in the cross-section in which the at least two measurement electrodes (12, 14) of the first side are disposed, wherein the following applies to the central angle β: 20 ≤ β ≤ 70.

The present invention claims protection for a modeling method based on a high turns ratio coupled inductor DC-DC. This method includes considerations of the influence of leakage inductance and right half-plane zeros in the precise analysis of high turns ratio coupled inductor DC-DC circuits. The coupled inductor boost converter can achieve high gain, or small input current ripple, and a high recovery rate of the energy of the leakage magnetic inductance. Three states of the circuit are selected for analysis under the dual criteria of accuracy and complexity. In the dynamic analysis of the mutual inductance coupled high turns ratio circuit, a model considering the leakage inductance in the primary of the high turns ratio coupled inductor circuit is used for modeling, and the analytical expressions of the DC turns ratio and the small-signal transfer function are obtained to simplify the design of the control part.

A method for driving an induction motor comprising a rotor and a magnetic core comprising a magnetic inductance component is provided, which comprises, by a motor drive configured for interfacing with the induction motor: performing a measurement of a voltage at terminals of the motor at standstill for a voltage measurement period during initial demagnetization of the magnetic core of the motor from an initial magnetic flux of the magnetic core, wherein the voltage measurement period is shorter than a time period of complete demagnetization of the magnetic core from the initial magnetic flux, and wherein the measurement of the voltage for the voltage measurement period comprises a plurality of S voltage measurement data points (vi)1≤i≤S, S being a non-zero natural integer; determining a first magnetic flux estimate component based on the plurality of S voltage measurement data points (vi)1≤i≤S ; determining a second magnetic flux estimate component by performing an exponential regression algorithm on the plurality of S voltage measurement data points (vi)1≤i≤S; and determining an estimate of the initial magnetic flux based on the first magnetic flux estimate and the second magnetic flux estimate component.

The application relates to the technical field of power electronic converter control, and provides a three-port flyback DC-AC converter, characterized in that the three-port flyback DC-AC converter comprises a flyback circuit, a power frequency reverse bridge, an AC-DC converter and a CL filter which are sequentially connected in cascade; the AC-DC converter is an AC-DC three-winding flyback converter which can realize power factor correction function, and is realized through active device multiplexing and magnetic component multiplexing, and comprises a flyback transformer T 2, excitation inductance L f , output switch Q 3, Q 4; the modulation method is to calculate instantaneous output power P o , judge the operation mode of the system, and respectively perform active modulation, reactive modulation or mixed modulation, so that the power factor is adjusted through the modulation method.

The invention discloses an efficient LLC converter structure inverter which comprises a power switch, a resonant network, a high-frequency transformer and a diode rectifier. The power switch is composed of four switching tubes which are divided into two groups and connected in series, and on-off is controlled to convert direct-current voltage into square-wave voltage. The resonant network is combined with an adjustable resonant inductor, a capacitor and an excitation inductor, dynamic working parameters are obtained through voltage sampling and PI feedback adjustment, the resonant inductor is connected with a bias winding, and bias current is applied to change magnetic resistance; harmonic waves of the square wave voltage are eliminated through a resonance network, and fundamental frequency sine waves are output; the high-frequency transformer integrates a magnetic core, a primary side / secondary side coil and an air gap in a single magnetic structure; the diode rectifier converts alternating voltage output by the secondary side of the high-frequency transformer into direct current, outputs smoothing voltage of a filter capacitor, and reduces ripple waves; by optimizing the resonant network and the high-frequency transformer, a circuit soft switching technology is realized, so that the loss in an energy transmission process is reduced, and the overall efficiency of the inverter is improved.

Magnetic inductors for microelectronics packages are provided. Magnetic inductive structures include a magnetic region, a magnetic region base region, and a conductive region that forms a channel within the magnetic region. The magnetic region has a different chemical composition than the base region. Additional structures are provided in which the magnetic region is recessed into a package substrate core. Further inductor structures are provided in which the conductive region includes through-core vias and the conductive region at least partially encircles a portion of a package substrate core. Additionally, methods of manufacture are provided for semiconductor packages that include magnetic inductors.

The invention discloses a bidirectional resonant DC-DC converter based on partial power voltage regulation, and belongs to the technical field of bidirectional DC-DC converters. The converter comprises direct-current voltage sources V1 and V2, a high-frequency transformer T, an input inductor Lin, resonant inductors Ld1 and Ld2, excitation inductors Lm1 and Lm2, a filter inductor Lf, a resonant capacitor Cr, filter capacitors Co1, Co2 and Co3, and power tubes S1, S2, S3, S4, S5, S6, S7 and S8. The converter is composed of a main body circuit resonance current type push-pull / SRC bidirectional converter and a partial power voltage regulating circuit non-isolated DC-DC converter. The main body circuit resonance current type push-pull / SRC bidirectional converter works in a DCX mode to forward transmit the total power to the secondary side from the primary side of the high-frequency transformer T or reversely transmit the total power to the primary side from the secondary side of the high-frequency transformer T; a non-isolated DC-DC converter of the partial power voltage regulation circuit is cascaded with a center tap of a secondary side of a high-frequency transformer of a resonance current type push-pull / SRC bidirectional converter of the main body circuit, so that efficient transmission of energy and wide-range voltage regulation can be ensured, and bidirectional transmission of power can be realized at the same time.

The utility model relates to a contact-free electric leakage detector. The contact-free electric leakage detector comprises a shell, a magnetoelectric induction device arranged in the shell and a signal processing unit connected with the magnetoelectric induction device, the magnetoelectric induction device comprises a conduction rod, a coil and a permanent magnet, the coil is installed on the inner surface of the shell, the conduction rod penetrates through the coil, the two ends of the conduction rod are connected with a first spring piece and a second spring piece respectively, the two ends of the first spring piece and the two ends of the second spring piece are connected with the shell, and the permanent magnet is installed on the shell. The permanent magnet is sleeved on the conduction rod, and the signal processing unit is connected with the magnetoelectric induction device through a lead. The device has the advantages of being compact in structure, high in safety and convenient to use.

The invention provides an active detection type protection method based on transformer excitation inductance parameter identification, and relates to the technical field of power systems, and the method comprises the steps: firstly, collecting the circuit information of a transformer, and judging whether a protection element acts or not based on the circuit information; under the condition that the protection element acts, a detection signal is generated based on the converter; the method comprises the following steps: firstly, detecting a detection signal, injecting the detection signal into a transformer to excite the excitation inductance response of the transformer, and secondly, determining a target excitation inductance parameter model based on an excitation inductance parameter model calculation module of the transformer; then, determining an excitation inductance characteristic value based on the original excitation inductance parameter model and the target excitation inductance parameter model; and finally, based on the excitation inductance characteristic value and a preset protection action criterion, whether a protection action is implemented is judged. According to the embodiment, the controllable detection signals are injected into the transformer, fault features are enhanced, and transformer fault early recognition and protection independent of power supply features can be achieved.

A magnetic-inductance component is a multi-turn closed coil connected head to tail and wound around a magnetic circuit. A magnetic-inductance value of the magnetic-inductance component is adjusted by selecting metal conductors with different numbers of turns, materials, cross-sectional areas, and lengths to change an amplitude and phase of a magnetic flux of the magnetic circuit. The present invention changes the operating state and operating trajectory of a vector in the magnetic circuit by adding the magnetic-inductance component to the magnetic circuit or removing the magnetic-inductance component from the magnetic circuit, to make a state of a magnetic flux vector in the magnetic circuit to be consistent with a target magnetic flux vector state. A magnetic circuit vector model built by using the magnetic-inductance component as a core is more consistent with the actual physical situation, which is beneficial to the improvement of the accuracy of magnetic circuit analysis and calculation.

The invention belongs to the technical field of wireless power supply, and provides a wireless power supply overvoltage protection circuit based on a moment magnetic material and a control method thereof.The wireless power supply overvoltage protection circuit comprises a primary side circuit, a transformer and a secondary side circuit, and energy transmission is achieved between the primary side circuit and the secondary side circuit through electromagnetic coupling of the transformer; and a moment magnetic inductor made of a moment magnetic material is connected in series in a secondary resonance network in the secondary side circuit.

The invention belongs to the technical field of ultra-high-speed linear motor control, particularly relates to a self-learning time-varying parameter current stability control method, system and equipment for an ultra-high-speed linear motor, and aims to solve the problem that current stability control is difficult to realize by a constant parameter control strategy. The method comprises the steps that stator excitation current im in historical operation is collected, a stator segment serial number n serves as input, stator excitation inductance Lnm serves as output, and a data set training neural network is constructed; and obtaining im and n in real time, inputting the im and the n into a training model, outputting a predicted value of stator excitation inductance Lnm, calculating to obtain a predicted value of mutual inductance Lnr based on a magnetic circuit relationship, inputting the predicted value of the stator excitation inductance Lnm and the predicted value of the mutual inductance Lnr into a time-varying parameter controller, and generating a control voltage to realize stable current control. According to the method, current oscillation caused by nonlinear rapid time variation of parameters is effectively suppressed, high-precision real-time prediction of excitation inductance is realized, and current tracking deviation is suppressed.

In the disclosed embodiment, a variable magnetic inductor (VMI) current sensor and an overcurrent detection method thereof are provided, wherein the current sensor comprises: an overcurrent detection inductor element, which generates a first excitation current in response to an applied first excitation voltage to form a first excitation magnetic field; an overcurrent detection circuit, which is used to determine whether the current to be measured is overcurrent based on the frequency and / or amplitude of the first excitation current related to the change in inductance value; wherein the overcurrent detection inductor element is arranged so that the direction of the normal of its cross section deviates from a preset angle relative to the magnetic field direction of the magnetic field of the current to be measured, so that the maximum current to be measured that the overcurrent detection inductor element can be used to detect is greater than the rated current. Therefore, by adjusting the angle of the overcurrent detection inductor element, the current to be measured that is a multiple of the rated current can be detected, which is very suitable for short-circuit current detection caused by thermal runaway of the battery pack.

The invention discloses a vector magnetic circuit coordinate transformation and embedded permanent magnet motor analysis and control method considering a salient pole effect, which comprises the following steps of: firstly, establishing a d-axis vector magnetic circuit model and a q-axis vector magnetic circuit model of an embedded permanent magnet motor, and regarding an arc tangent value of a ratio of equivalent magnetic inductive reactance to magnetic resistance of a d-axis magnetic circuit or a q-axis magnetic circuit as an iron loss angle of the d-axis magnetic circuit or the q-axis magnetic circuit; d-axis and q-axis iron loss angles are used to consider the influence of iron loss and the salient pole effect on motor performance and control thereof, and R-L coordinate transformation considering the salient pole effect and an R-L coordinate system considering the salient pole effect are provided; and then, establishing a flux linkage equation and a voltage equation based on a vector magnetic circuit and an R-L coordinate system considering a salient pole effect, and establishing a sensorless control method based on the provided analysis model. The method provided by the invention can fully consider the influence of the iron loss and the salient pole effect on the motor performance and the control thereof, is simple and convenient, has clear physical significance, and improves the rotor position identification precision without position sensor control.

The invention discloses a phase selection switching-on method based on transformer residual magnetism measurement and calculation, and the method comprises the steps: S1, carrying out the disassembly of a total magnetic flux, and obtaining a residual magnetic flux; s2, enabling the residual magnetic flux to be equivalent to residual magnetic inductance, and obtaining a residual magnetic measurement and calculation test equivalent circuit; s3, establishing a voltage loop equation and a current loop equation based on the residual magnetism measurement and calculation test equivalent circuit; s4, solving a simultaneous equation set formed by the voltage loop equation and the current loop equation to obtain a value of the residual magnetism inductance and a voltage value with equivalent energy on the residual magnetism inductance; s5, substituting the solved residual magnetism inductance value and the voltage value with equivalent energy on the residual magnetism inductance into a residual magnetism measurement and calculation test equivalent circuit to obtain a line current expression of transformer no-load closing; and S6, before closing each time, determining an optimal closing moment based on the line current expression of transformer no-load closing so as to suppress the magnetizing inrush current. According to the method, a line current expression of transformer no-load closing is finally obtained based on the residual magnetism measurement and calculation test equivalent circuit, so that phase selection closing can be performed after the residual magnetism condition of the transformer is accurately measured and calculated before closing, and excitation inrush current is inhibited.

The present application relates to the technical field of steel rolling production, and specifically to a normalizing process for high magnetic induction 25WD1300 non-oriented silicon steel, which includes: trimming hot-rolled silicon steel coils; normalizing heating in a normalizing furnace, which is divided into a preheating section, a non-oxidizing heating section, a radiant tube heating section, and a soaking section; determining the comprehensive heat transfer coefficient at each moment of the radiant tube heating section, dynamically adjusting the heating power of the radiant tube heating section, and normalizing cooling after heating, which is divided into a primary slow cooling section, a secondary slow cooling section, a tertiary slow cooling section, a quaternary slow cooling section, and a fast cooling section; using a shot blasting machine to blast the normalized steel, and then using shallow trough turbulent acid for three-stage pickling; rolling the pickled steel to obtain a chilled coil; annealing the chilled coil to obtain a non-oriented silicon steel. The present application improves the magnetic property consistency of 25WD1300 non-oriented silicon steel.

The application discloses a resonant converter and a control method. The resonant converter comprises a primary side inverter switching circuit (II), a primary side resonant cavity (III), a transformer (IV), a secondary side rectifier circuit (V) and a filter output circuit (VI) connected in sequence. The primary side resonant cavity (III) comprises a resonant capacitor, a resonant inductor, an excitation inductor and two switch tubes connected in reverse series. The secondary side rectifier circuit (V) comprises two power tubes and two switch tubes. In the control, when the resonant converter outputs a low voltage, a PWM control is adopted to adjust the output voltage; when the resonant converter outputs a high voltage, a phase shift control is adopted to adjust the output voltage. The resonant converter can adjust the output voltage from a low voltage to a high voltage, and the voltage adjustment range is wide. Compared with the traditional technology, the frequency adjustment range is obviously reduced, the optimization design of magnetic devices such as transformers and inductors is facilitated, and the power density and efficiency of the resonant converter are improved.

The application belongs to the technical field of electronic component processing, and particularly relates to a winding production device and method based on magnetic inductance. In the winding process, only magnetic rings of the same size can be fixed, thereby reducing the production effect of the device. Moreover, due to more manual operations, the production efficiency of the winding device is reduced. The present application proposes the following scheme, which comprises a tool support frame, the upper side of the tool support frame is fixedly connected with a winding support table, a winding module is arranged above the winding support table, the winding module comprises a guide conveying frame, the upper side of the winding support table is fixedly connected with L-shaped support plates at equal distances in a circle, and a limiting slot is formed in one side of each of the L-shaped support plates. The winding production device and method based on magnetic inductance have the effect of fixing magnetic rings of different sizes, thereby improving the production effect of the device, reducing manual operations in the winding process, and improving the production efficiency of the winding device.

The invention discloses a fixed-frequency LLC circuit and a method for tracking its resonant frequency in the field of LLC circuits. The circuit comprises a primary full-bridge circuit, a resonant inductor, an excitation inductor, a resonant capacitor and a rectifier filter circuit; the circuit also comprises a voltage signal acquisition circuit, which is used for acquiring a bridge arm voltage and a resonant capacitor voltage and sending the acquisition to an actual phase difference operation module; the actual phase difference operation module is used for calculating the actual phase difference between the bridge arm voltage and the resonant capacitor voltage; the reference phase difference operation module is used for obtaining a reference phase difference between the bridge arm voltage and the resonant capacitor voltage when the operating frequency is equal to the resonant frequency; the phase difference comparison module is used for receiving the outputs of the actual phase difference operation module and the reference phase difference operation module, comparing the actual phase difference with the reference phase difference, and outputting the comparison result to a feedback control module; the invention can adjust the operating frequency of the LLC converter to track the resonant frequency, and solve the problem of resonant frequency point deviation caused by changes in circuit parameters.

The invention provides a pneumatic magnetic sensing device based on mistaken touch prevention and an electronic atomizer, and the device executes the following steps: a magnetic sensing chip obtains magnetic induction intensity, and a magnetic sensing module carries out split-axis processing according to a magnetic induction intensity stroke change value of the magnetic induction intensity to obtain N magnetic induction coordinate values; detecting whether the N magnetic induction coordinate values are in the N coordinate threshold interval ranges in a one-to-one correspondence manner; if the N magnetic induction coordinate values are in the N coordinate threshold interval ranges in a one-to-one correspondence manner, the logic control chip outputs a starting signal; otherwise, outputting a closing signal. The logic control chip outputs a starting signal, if the multi-axis magnetic induction coordinate values are all located in the corresponding coordinate threshold interval range, there is no interference of the magnetic substance, the logic control chip outputs a starting signal, and if one or more numerical values in the multi-axis magnetic induction coordinate values are located outside the corresponding coordinate threshold interval range, there is interference of the magnetic substance, and the logic control chip outputs a starting signal. Under the condition of magnetic substance interference, a closing signal is output, and self-starting of the electronic atomizer is prevented.

The invention discloses a transformer protection method and system based on excitation inductance parameter identification, and relates to the technical field of power system relay protection, and the method comprises the steps: judging whether protection is started or not based on a transformer differential current fault component criterion; constructing a transformer excitation branch voltage equation set for each sampling point at the protection starting moment and within 8-12 ms after protection starting based on a transformer T-type equivalent loop; and solving the transformer excitation branch voltage equation set based on a singular value decomposition method to obtain a transformer excitation inductance calculation value at the protection starting moment and within 8-12ms after protection starting. According to the method, the protection criterion is constructed based on excitation inductance parameter identification, and the essential characteristics of the transformer fault can be reflected; a branch equation is constructed through voltage and current instantaneous values, the excitation inductance is solved, the method does not depend on the power frequency quantity, and compared with transformer differential protection based on the power frequency electric quantity, the method is not affected by power source characteristics and is high in sensitivity.

The embodiment of the invention provides a packaging substrate and a manufacturing method thereof, and the manufacturing method comprises the steps: manufacturing a micron-sized annular cavity with a solid metal column through etching a metal foil, and filling the annular cavity with a magnetic material to form a buried magnetic inductor, so as to form a first buried magnetic core layer with a solid metal column; the method comprises the following steps of: sputtering multiple layers of metal on a first embedded magnetic core layer, electroplating, laminating a dielectric material and the like so as to carry out layer addition, carrying out pattern processing, carrying out local etching on an electroplated metal layer, forming an annular concave cavity, and then filling the annular concave cavity with a magnetic material; the process is repeated, so that a plurality of inductor structures with solid metal columns and different thicknesses and sizes are manufactured at different levels. According to the embodiment of the invention, multi-specification inductor structures are realized through multiple layers of buried magnets, the expansibility of the inductor structures is high, the inductance value of the inductor can be more finely controlled, different voltage regulation requirements can be met, and the resistance can be reduced by adopting the solid metal columns, so that the optimization of the performance is realized.

The present invention relates to a three-pole ceramic gas discharge tube module, comprising a three-pole ceramic gas discharge tube connected in series with a magnetic micro-breaking mechanism. An electromagnetic tripper is also connected in parallel between the three-pole ceramic gas discharge tube and the magnetic micro-breaking mechanism. The magnetic micro-breaking mechanism is connected to an arc extinguishing chamber. After the arc is extinguished by the arc extinguishing plate caused by H2 explosion, the subsequent DC current is interrupted, increasing by hundreds or thousands of times. The high-voltage and high-current path of the lightning pulse passes through the three-pole ceramic gas discharge tube, micro-breaking two contacts; the subsequent DC current passes through the diode of the three-pole discharge tube and the micro-terminal magnetic inductor coil; when the DC current is higher than 3A or 5A, the subsequent DC current is immediately interrupted. The subsequent DC voltage is interrupted up to 1500V and the current is up to 5kA, which greatly improves the defects of traditional three-pole ceramic gas discharge tubes, maximizes the lightning protection characteristics of the ceramic gas discharge tube, and makes the greatest contribution to lightning protection and disaster reduction and improving economic benefits.

A coaxial magnetic inductor structure for semiconductor package applications is provided. The coaxial magnetic inductor may be located in a semiconductor package core, and the semiconductor package core may be composed of, for example, an amorphous solid glass material. A method of fabricating a coaxial magnetic inductor in a package substrate core is also provided.

According to the low-cost high-magnetic-conductivity high-magnetic-shielding magnetically soft alloy and the preparation method thereof, Fe-Si-Al is adopted as a basic system, microalloying elements such as B and Nb are creatively introduced, specific critical cold rolling and magnetic field heat treatment processes are adopted, and the obtained magnetically soft alloy has high magnetic conductivity and high magnetic shielding effectiveness. Wherein the resistivity of the alloy is effectively improved and the magnetocrystalline anisotropy is optimized through the synergistic effect of Si and Al; the grain boundary segregation effect of the B element purifies the grain boundary, and the moving resistance of the magnetic domain wall is remarkably reduced; and the dispersed precipitated phase formed by the Nb element effectively refines the initial crystal grains and lays a foundation for subsequent formation of uniform and thick recrystallized crystal grains. Particularly, a strong Gaussian texture is induced through accurately controlled critical cold rolling deformation, and magnetic domains are directionally arranged in an easy magnetization direction in combination with magnetic field heat treatment applied near a Curie point, so that the coercive force is fundamentally reduced, and the initial magnetic conductivity is improved.

A conversion device comprises: a transformer for generating an output voltage according to an input voltage; the current transformer is coupled to the first node of the transformer; one end of the resonant inductor is used for receiving the input voltage, and the other end of the resonant inductor is coupled to the current transformer at a second node; and the excitation inductor is coupled to the transformer at the third node, the excitation inductor is coupled to the resonant inductor at the second node and is adjacent to the resonant inductor, and the current transformer is arranged between the transformer and the resonant inductor along the first direction. According to the conversion device disclosed by the utility model, the occupied space on the printed wiring board is effectively reduced, and the magnetic flux generated by the resonant inductor and the excitation inductor to the transformer together is reduced. The disclosure also relates to a related manufacturing method.

A method is provided for configuring a motor drive for driving an induction motor, which includes a rotor and a magnetic core comprising a magnetic inductance component. The method includes: performing a first Direct Current, DC, current injection of a first DC current value in the motor at standstill during a first predetermined time duration for first magnetization of the magnetic core of the motor; performing, following the first DC current injection, a second DC current injection of a second DC current value in the motor at standstill during a second predetermined time duration for second magnetization of the magnetic core of the motor. The second predetermined time duration is shorter than the first predetermined time duration.