49 results about "Magnetic characteristic" patented technology

This application relates to the field of motor technology, specifically to a stator assembly and a motor. The stator assembly includes: a stator core, comprising a stator yoke and multiple stator teeth, the multiple stator teeth being spaced circumferentially along the inner surface of the stator yoke, with a receiving groove formed between two adjacent stator teeth, the receiving groove having an opening located at the end of the receiving groove away from the stator yoke; and a cover, which is disposed on the opening, and the cover is a magnetically conductive material. By configuring the cover as a magnetically conductive material, the cover has magnetically conductive characteristics. Utilizing the magnetically conductive characteristics of the cover, the air gap magnetic permeability distribution is made more uniform, thereby effectively reducing the harmonic content of the air gap magnetic field and thus reducing eddy current losses.

This invention discloses a modeling method for a proxy model of a permanent magnet synchronous motor under eccentric conditions. First, a mathematical model of the eccentric motor proxy model is established, including the permanent magnet flux linkage and no-load back EMF, flux linkage model, voltage model, electromagnetic torque, and torque balance equations. Then, no-load back EMF, permanent magnet flux linkage, and dq-axis inductance data are obtained through finite element simulation, and harmonic fitting is performed on the permanent magnet flux linkage. Next, a multi-dimensional parameterized lookup table covering eccentricity type and degree, speed, torque, and rotor position angle is constructed. The lookup table and interpolation algorithm are integrated into the simulation platform to form a high-fidelity proxy model module that can be called in real time. Finally, the model accuracy is verified by comparison with finite element simulation and experimental data. This invention achieves high-precision and rapid mapping of the electromagnetic characteristics of eccentric motors, balancing modeling accuracy, efficiency, and versatility.

The present invention can provide a non-oriented electrical steel sheet having improved surface properties and magnetic properties, and another aspect provides a method for manufacturing the non-oriented electrical steel sheet.

The present application belongs to the field of magnetic nanoparticle measurement, and particularly relates to a high-sensitivity magnetic nanoparticle spectrometer and a waveform signal conversion method thereof, and aims to solve the problem that the dynamic magnetic characteristics of low-concentration magnetic nanoparticles cannot be quantitatively evaluated in the prior art. The present application comprises a driving module, a switching module, a current sampling module, a band-pass filtering module, a rectifying module, a current control module, a voltage adjustment module, a coil matching module, a coil assembly, a receiving coil signal processing module, a signal acquisition analog block, and a main control calculation module. According to the target current demand, the coil matching module can be flexibly edited, and further, the control signal for driving the coil can be automatically generated according to the matched driving circuit and the target waveform, wherein the data acquisition-processing link can restore the waveform and obtain the original spectrum of the magnetic particles through the built-in calculation steps. At the same time, the current compensation loop contained in the present application can compensate the current error caused by factors such as coil temperature rise, parameter drift of the matching module, and change of the on-resistance of the switching module, so as to ensure the constant output of the target harmonic current.

The application relates to the technical field of function test, and discloses a stress measurement system for spring fatigue state, which comprises an excitation unit, a sensing unit and a signal processing unit. The excitation unit applies an alternating excitation magnetic field to the spring to generate a stress-modulated induced electromotive force signal. The sensing unit collects magnetic characteristic parameters by using a quadrature differential sensing structure. The signal processing unit obtains phase components in a tangential signal and a radial reference signal, calculates a dynamic spiral angle deflection based on a phase difference, determines a dynamic differential compensation coefficient to extract a tangential principal stress component and compensate for a magnetic flux leakage vector deviation. Through a space posture modulation and lift gap fluctuation suppression mechanism, the application realizes dynamic alignment of a sensor measurement main shaft and a spring stress tensor main shaft, effectively eliminates geometric deflection errors caused by large amplitude deformation, and ensures that the system has high signal-to-noise ratio and baseline stability under cyclic load.

The application discloses a current transformer magnetic characteristic test system and method and a computer program product, wherein the system comprises an original data acquisition module, a data feature generation module, a quality index evaluation module, a high load performance test module and a threshold correction determination module; core parameters are obtained by dynamically adjusting a sampling strategy, a feature vector is generated after preprocessing, a multilayer convolutional neural network model is used to mine parameter nonlinear correlation and output a quality index; a quality evaluation correction value is generated by combining temperature rise and noise data under a high load condition, an evaluation threshold is dynamically corrected, and test result determination is realized. The application effectively solves the problems of high misjudgment rate of static threshold determination in the prior art, difficulty in capturing parameter nonlinear correlation and inability to predict long-term stability, significantly improves the precision and reliability of magnetic characteristic test, accurately predicts the long-term full-load operation stability of equipment, and provides a reliable basis for power system core equipment selection and safe operation.

The application relates to a solid-state spin nondestructive detection device which comprises a diamond block, a data acquisition module, a data processing module and a main control module; the diamond block contains an NV color center, two paired magnetic characteristic frequencies of the NV color center are set as two selectable data sampling points, the data acquisition module is used for sampling analog data and is configured to alternately sample the two data sampling points in turn; the data processing module is used for real-time calculation of the average value of the previous N sampling data of the current sampling data, and the average value is subtracted from the current sampling data to obtain a difference value as real-time output magnetic field noise reduction characteristic data. The application has the advantages that the two magnetic characteristic frequencies are alternately sampled, the algorithm of "current sampling data minus average value of previous N sampling data" is combined, temperature suppression and magnetic field measurement noise reduction are realized, the magnetic field sampling rate and the frequency sampling rate are kept consistent, and the magnetic field sampling rate and the detection speed are improved.

The present application relates to the technical field of scraper conveyor, and particularly relates to a chain breakage fault pre-judgment device and method of a scraper conveyor and the scraper conveyor, the device comprising: a controller, a first plug plate and a first magnetic sensor fixed to the first plug plate; a conveying groove of the scraper conveyor is provided with a first opening, the first plug plate is inserted into the first opening and located at a side of the chain close to a chain channel, and the first magnetic sensor is fixed to the first plug plate and opposite to one side of the chain; in the process of running of the chain of the scraper conveyor, the first magnetic sensor collects a first magnetic characteristic signal of a chain link passing through the first magnetic sensor; the controller is connected with the first magnetic sensor, the damage state of the chain link is analyzed according to the first magnetic characteristic signal, and whether the chain link is a chain breakage fault risk point is pre-judged based on the damage state. In this way, the present application pre-judges the chain damage of the scraper conveyor in advance, so as to realize the early warning and preventive maintenance of the chain breakage fault, and the operation reliability and safety of the scraper conveyor are improved.

This application provides a modeling method and system for predicting the core loss of a high-frequency transformer, comprising: measuring the magnetic properties of the core material at different frequencies based on an experimental platform, and obtaining the magnetization curve and loss density curve of the core material according to Ampere's circuital law; inputting the magnetization curve into a constructed geometric model, setting excitation and boundary conditions, establishing a finite element model and performing finite element simulation analysis to obtain the loss density distribution and magnetic flux density distribution within the high-frequency transformer core; and constructing a loss model by introducing a gradient coefficient and the average value of the loss density, the magnitude of the magnetic field strength gradient, and the average value of the magnitude of the magnetic field strength gradient obtained from the finite element model, to predict the core loss. This application provides important basis for material selection, geometric structure optimization, and thermal design of high-frequency transformers, helping to shorten the R&D cycle, reduce trial production costs, and improve the overall performance of high-frequency transformers.

The application discloses a multistage grading screening method for manufacturing battery negative materials, relates to the technical field of lithium ion battery material preparation, and actively applies a high-frequency rotating magnetic field in a grading area, so that eddy current is generated in all through particles, when a magnetic foreign matter wrapped by non-magnetic matter passes, the magnetic core in the magnetic foreign matter generates a unique magnetic response in the changing magnetic field, and the overall conductive characteristic of the magnetic foreign matter is different from normal materials due to the existence of the non-magnetic wrapping layer, signal processing and the controller perform real-time fusion and coupling analysis on the two signals, can distinguish the signal combination with the abnormal resistivity characteristic and the weak magnetic characteristic, the identification mode of the active detection and double-dimensional sensing does not depend on the strong magnetism of the foreign matter appearance, a breakthrough is realized in the detection principle, and reliable target indication is provided for subsequent accurate capture.

This invention discloses an experimental device for verifying the magnetic characteristics of a bilateral permanent magnet electric levitation system. Utilizing the principle of differential air gap in the bilateral electric levitation topology, a test device is constructed to verify the damping characteristics of the system. The device comprises two levitation modules connected by a crossbeam suspended from a levitation module support frame, facing an annular reaction track. The annular reaction track is connected to a drive motor via a support tray and coupling. The drive motor drives the annular reaction track and the permanent magnet levitation modules to generate relative motion, thus producing levitation force. By adjusting the initial gap between the two levitation modules and the annular reaction track, a differential gap condition of the bilateral levitation guidance system is created. Adjusting the motor speed simulates the damping vibration of the levitation system at different operating speeds. The oscillation waveform of the levitation gap is measured using a gap sensor, and the damping characteristics of the test system under specific operating conditions are further investigated.

This invention discloses a magnetic coding unit material for road area information used in autonomous driving and its preparation method. The magnetic coding unit material is made of asphalt, limestone, magnetic ceramics, and composite mineral powder. The mass of the asphalt is 5.1% of the sum of the masses of the limestone and composite mineral powder, and the mass of the magnetic ceramics is 10%-80% of the sum of the masses of the limestone and magnetic ceramics within the same gradation range. After being magnetized by a magnetizer, the material of this invention, combined with an onboard gaussmeter, can read the binary coding information of the road, achieving comprehensive, rapid, and efficient detection and identification of road area information. It has advantages such as low cost, high reliability, energy saving, and environmental protection, while also possessing good thermal stability, corrosion resistance, mechanical properties, and electromagnetic characteristics.

The application discloses a kind of 48 hours salt fog resistant microamorphous soft magnetic powder, the microamorphous soft magnetic powder is Fe-Ni-Mo-Si-B-P-C-Cr system soft magnetic powder, its surface is successively coated with SiO2 coating and corrosion inhibitor layer, and constitutes double-layer composite coating structure.The application is directed to the amorphous powder soft magnetic characteristics, adds Ni, Mo, Cr three elements on the basis of traditional Fe-Si-B amorphous soft magnet, so that the corrosion resistance of powder itself is greatly improved, the rust prevention ability of amorphous powder is significantly improved by double-layer composite coating structure, and excellent soft magnetic performance can be maintained.

The present application provides an inductor that improves electromagnetic characteristics while reducing the height of the inductor itself. The inductor (100) has a magnetic core (200) and a coil (400). The magnetic core (200) has a first edge (220) and a second edge (250). The coil (400) has a first terminal (410), a second terminal (490), a first portion (430), a second portion (470), a third portion (450), a first connecting portion (420), a second connecting portion (480), a first extension portion (440), and a second extension portion (460). The first portion (430) and the second portion (470) are separated from and parallel to the first edge (220), and are separated from the third portion (450) in a first horizontal direction. In a second horizontal direction, the first portion (430) and the second portion (470) each have a smaller size than the third portion (450). The third portion (450) is separated from and parallel to the second edge (250).

The present invention relates to a measurement method for at least indirectly measuring and mapping the individual electromagnetic behavior of a multiphase electric motor (30), and a control method for controlling an emulation of the individual electromagnetic behavior of an electric motor. At least one characteristic map (K1 - Kn), generated in the measurement method and provided in the control method, contains an amplitude of a magnetic flux linkage (PsiD, PsiQ) and / or an amplitude of a torque interacting with the magnetic flux linkage (PsiD, PsiQ) in relation to a current (Id, Iq) and the rotor position (gamma), thereby mapping the individual electromagnetic behavior of the electric motor (30) metrologically and making it available for control purposes.

The present application relates to a non-oriented electrical steel sheet and a manufacturing method thereof. The non-oriented electrical steel sheet and the manufacturing method thereof according to the present application can have excellent magnetic properties, in particular, can have low iron loss.

The utility model provides a kind of rotary transformer rotor, it includes: lamination, lamination is formed by the staggered lamination of multiple punching sheet, each punching sheet is equipped with mounting hole, recess and protrusion cooperation is formed positioning on the lamination of each punching sheet It is equipped with rivet mouth, the outer edge of each punching sheet is equipped with magnetic conducting surface;Shaft, shaft is worn in mounting hole to make each punching sheet be in coaxial state, recess and protrusion cooperation between shaft and mounting hole to limit the relative rotation of shaft and each punching sheet in circumferential direction;Two shaft sleeves, two shaft sleeves are correspondingly sleeved on the shaft of lamination both ends and are welded with shaft, to limit the relative movement between lamination and shaft in axial direction.The rotary transformer rotor structure is stable, simple to assemble, can guarantee the stability of sensor electromagnetic characteristic.

The present invention provides a rare earth sintered magnet which contains R (R represents one or more rare earth elements essentially including Nd), T (T represents one or more iron group elements essentially including Fe), B, M1 (M1 represents one or more elements selected from among Al, Si, Cr, Mn, Cu, Zn, Ga, Ge, Mo, Sn, W, Pb and Bi) and M2 (M2 represents one or more elements selected from among Ti, V, Zr, Nb, Hf and Ta), while comprising an R2T14B phase as the main phase. This rare earth sintered magnet is characterized in that: the M1 is in an amount of from 0.5% by atom to 2% by atom; if (R), (T), (M2) and (B) are the respective atomic percentages of the above-described R, T, M2 and B, the relational expression (1) ((T) / 14)+(M2)≤(B)≤((R) / 2)+((M2) / 2) is satisfied; and from 0.1% by volume to 10% by volume of all grain boundary phases in the magnet is composed of an R6T13M1 phase. This rare earth sintered magnet is able to achieve excellent magnetic characteristics including a good balance between high Br and high HcJ.

Provided are Ce / Co / Cu permanent magnet alloys containing certain refractory metals, such as Ta and / or Hf, and optionally Fe which represent economically more favorable alternative to Sm-based magnets with respect to both material and processing costs and which retain and / or improve magnetic characteristics useful for GAP MAGNET applications.

The present invention provides an R-T-B based permanent magnet alloy capable of producing an R-T-B based permanent magnet having improved magnetic properties. The R-T-B based permanent magnet alloy has R, T, and B, R being a rare earth element, T being a transition metal element, and B being boron. The area ratio of non-columnar crystal structure in a cross section is 1.0% or more and 30.0% or less.

The utility model relates to the technical field of inductance, provide a kind of copper iron co-fired inductance, including sintered magnet and conductor;The conductor is integrally formed structure, the conductor includes connecting portion and the end portion respectively connected in the both ends of connecting portion, the connecting portion of the conductor is located in the sintered magnet, the both ends of the conductor are exposed to sintered magnet, as terminal, and there is electroplating layer at terminal, forms electrode, the sintered magnet surface is provided with the recess for the terminal accommodation. Reduce electrode exposure, inductance has higher electromagnetic characteristic, to reduce inductance leakage flux, improve inductance performance.

This invention provides a method for maintaining the magnetic properties of a cut magnetic core stably over a long period, even when a surface oxide film is formed on the contact surface of a magnetic core that is difficult to cut through heat treatment at a crystallization heat treatment temperature. The cut magnetic core of this invention comprises two or more laminates in which a soft magnetic alloy strip is stacked along the thickness direction. Each of the laminates has at least one contact surface that is in contact with each other. The soft magnetic alloy strip is composed of Fe... 100‑x‑y‑z‑a‑b Si x B y Cu z Cr a M b The composition is indicated by M (where M represents at least one element selected from Nb and Mo, and x, y, z, a, and b represent the atomic percentages of Si, B, Cu, Cr, and M, respectively, satisfying 11.0≤x≤17.0, 5.0≤y≤10.0, 0.5≤z≤2.0, 0.5≤a≤4.0, 1.0≤b≤5.0, and 65≤100-x-y-z-a-b≤75).

The embodiments provide a magnetic storage device in which the degradation of magnetic properties is suppressed. One embodiment of the magnetic storage device includes: a first conductor; a variable resistive material on the upper surface of the first conductor; a second conductor on the upper surface of the variable resistive material; a first insulator other than a nitride on the upper surface of the second conductor; a third conductor located within the first insulator and having a bottom surface in contact with the upper surface of the second conductor; and magnetoresistive elements on the upper surfaces of the first insulator and the third conductor.

A method for fabricating a spatially varying permanent magnet with increased resistance to demagnetization is presented. The method begins by aligning magnetic particles in powder form using an alignment fixture. The pole pieces of the electromagnet are configured with materials exhibiting varying magnetic permeabilities to control the orientation and strength of the magnetic field. By adjusting these properties, the magnetic particles are aligned in different regions of the magnetizable material to create spatially varying magnetic characteristics. Finally, the permanent magnet is formed with at least one inclined light axis in specific regions, which enhances its resistance to demagnetization.

The application belongs to the field of material nondestructive testing, and particularly relates to a P91 pipeline aging grade prediction method based on micro-magnetic characteristic parameters, which comprises the following steps: a two-dimensional calibration system covering microstructure characteristics and macroscopic mechanical properties is constructed, and multi-level standard samples are prepared; multi-dimensional micro-magnetic data of each level of samples under step-by-step tensile load is collected, and a full-dimensional data set containing aging grade, stress level and micro-magnetic parameters is constructed; a ReliefF feature screening algorithm is used to identify core characteristic parameters which are highly sensitive to aging and can effectively distinguish stress interference; a back propagation neural network prediction model is constructed with the core parameters as input and the calibration grade as output, and is applied to field detection. Through core parameter screening and multi-parameter model fusion, the application realizes effective decoupling of stress and aging influence, guarantees the integrity of the pipeline structure, and significantly improves the accuracy of quantitative prediction of the aging grade.

An inductor having improved magnetic characteristics and a method for manufacturing the inductor. An inductor includes an element body including a plurality of magnetic metal powder particles and a coil in the element body. Each magnetic metal powder particle includes a magnetic metal core particle containing Fe and an oxide layer containing a readily oxidizable material having a higher tendency to oxidation than Fe. When an interparticle layer region is defined as a region where a distance between the surface of a first magnetic metal core particle and the surface of a second magnetic metal core particle adjacent to the first magnetic metal core particle is smaller, and a non-interparticle layer region is defined as a region where the distance is larger, the concentration of the readily oxidizable material in the non-interparticle layer region is higher than that in the interparticle layer region.

The application discloses a non-planar coil electromagnetic characteristic simulation method based on a superconducting bundled cable and relates to the technical field of superconducting magnet electromagnetic simulation. The application firstly builds a three-dimensional model of the non-planar coil to obtain a magnetic field configuration distribution, determines a minimum boundary of a magnetic field extraction, a cross section position and performs a grid independence check, evaluates a local critical current by using a self-consistent model after coordinate migration, and takes the minimum value of the local critical current of each cross section as the global critical current. The application effectively solves the problems of high simulation freedom and poor convergence of the coil, can accurately simulate electromagnetic characteristics such as the critical current, and provides technical support for the design optimization and safe operation of the non-planar coil based on the superconducting bundled cable.

This application provides a magnetic signal measurement system, method, and apparatus for sheet-like ferromagnetic materials, relating to the field of magnetic property measurement. The system includes a sample under test, a magnetic field strength measuring device, a magnetic induction intensity measuring device, a strain measuring device, an upper fixed plate, a lower fixed plate, and a magnetic signal processing device. The sample under test is placed on the lower fixed plate and magnetized under an orthogonal magnetic field. The magnetic field strength measuring device is fixed to the upper fixed plate by double-ended studs and acquires the magnetic field strength signal. One end of the magnetic induction intensity measuring device is welded to the magnetic field strength measuring device, and the other end contacts the sample to acquire the magnetic induction intensity signal. The strain measuring device is deployed on the surface of the sample and acquires the magnetostrictive strain signal. The magnetic signal processing device connects to each device and processes the three types of signals to obtain magnetic property data. This system, through orthogonal magnetic field excitation, multi-device collaborative acquisition, and integrated signal processing, can achieve simultaneous measurement of the two-dimensional magnetic properties and magnetostrictive effect of sheet-like ferromagnetic materials, improving measurement efficiency.

This invention provides a detachable, low-magnetic-characteristic AUV magnetic detector probe fixing device and disassembly method, belonging to the field of underwater robot technology. The device includes: a base, a probe rod, a buoyancy block, a lightweight outer shell for the probe rod, and a lightweight outer shell for the base. The base is fixed to the AUV carrier frame, and the base is covered by the lightweight outer shell. The probe rod is connected to the base via a flange, and a buoyancy block is installed between the probe rod and the lightweight outer shell. The end of the probe rod has an angle-adjustable optically pumped magnetic detector probe fixing frame, on which the optically pumped magnetic detector probe is mounted. This invention is made of non-magnetic titanium alloy and non-magnetic resin materials, and the overall design is streamlined and smooth, featuring high integration, low fluid resistance, and low self-magnetic interference. Furthermore, the probe rod assembly can be completely separated from the base, facilitating the transportation, storage, and sensor maintenance of the AUV.