196 results about "Magnetic hysteresis" patented technology

The invention provides a biphase composite magnetic material magnetically controlled reactor electromagnetic transient simulation method, device and equipment and a medium, and relates to the technical field of power equipment magnetic material testing and electromagnetic transient simulation. According to the invention, the test winding is arranged on the excitation winding of the magnetically controlled reactor, and multi-dimensional means of obtaining total iron loss through an open circuit test, obtaining magnetic hysteresis loss through a frequency reduction test, obtaining copper loss and leakage reactance through a short circuit test and the like are combined, so that separation of magnetic hysteresis loss, eddy current loss and additional loss can be realized; a high-fidelity hysteresis loop and a magnetic conductivity change rule are obtained, and the nonlinear characteristic and hysteresis response of the magnetic core can be accurately captured, so that the predictive capability of equipment performance and the sensing capability of an operation state are improved.

The invention provides a hysteresis loop analysis method for a transformer no-load loss test, and belongs to the technical field of transformers. Exciting voltage and current signals are collected in a transformer no-load state, and an active filter is used for carrying out digital filtering processing to eliminate harmonic interference; a data corresponding relation between magnetic flux density and magnetic field intensity is established through a digital integration algorithm and a magnetic field intensity calculation formula to form original hysteresis data, the original hysteresis data is processed by using a hysteresis loop optimization model, a complete hysteresis loop curve is generated, and the hysteresis loop area is calculated. According to the hysteresis loop area, the hysteresis loss power density is calculated through the iron loss calculation function, the total value of the transformer no-load loss is obtained by combining the eddy current loss calculation result, and the technical problems that the hysteresis loop reconstruction precision is not high and the complex hysteresis phenomenon cannot be adapted in the transformer no-load loss test are solved.

The invention provides a weld bead iron core loss calculation method and device based on a finite element, and the method comprises the steps: carrying out the simulation based on an iron core simulation model, and obtaining a model transient calculation result; obtaining a flux density curve corresponding to a non-welding area of the iron core according to a transient calculation result of the model; calculating iron core magnetic hysteresis loss and iron core eddy current loss of the whole iron core non-welding area according to the flux density curve and the bonding sample test BP curve; according to a model transient calculation result, calculating iron core hysteresis loss of the whole iron core welding area and iron core eddy current loss of the whole iron core welding area; and outputting the iron core magnetic hysteresis loss and the iron core eddy-current loss of the whole iron core non-welding area and the iron core magnetic hysteresis loss and the iron core eddy-current loss of the whole iron core welding area. According to the method and the device, the welding stator core loss can be quickly and accurately simulated and calculated, so that the calculation complexity is effectively reduced, the calculation efficiency is improved, the engineering design efficiency is improved, and the engineering design cost is reduced.

The invention relates to the technical field of motors, in particular to a motor stator core. The motor stator core comprises a plurality of punching sheets, a plurality of pear-shaped grooves extending along the radial direction are uniformly distributed on the inner circumference of each punching sheet, and two adjacent surfaces of each pear-shaped groove are in fillet transition, so that magnetic field concentration of sharp edges is eliminated, and the problem of overhigh local magnetic flux density is reduced; the arc-shaped structure of the pear-shaped groove can provide a smoother magnetic path, magnetic resistance is reduced, magnetic lines are distributed more reasonably, magnetic hysteresis loss is reduced, and a magnetic circuit is improved. All the punching sheets are stacked in the axial direction, the pear-shaped grooves in all the punching sheets are in one-to-one correspondence to form a plurality of inclined notches, and compared with original vertical notches of the stator iron core, the inclined notches of the stator iron core have the advantages that the space for accommodating windings is increased, and the magnetic field density is improved. And the inclined notches enable the stator teeth and the rotor teeth to be not completely aligned, so that the tooth harmonic phases are different and mutually offset, thereby weakening the overall harmonic, reducing the electromagnetic noise and vibration, and further improving the motor performance.

The invention discloses an iron-nickel metal magnetic powder core with high stable magnetic conductivity and low loss and a preparation method of the iron-nickel metal magnetic powder core. The iron-nickel metal magnetic powder core is prepared through the steps of preparing iron-nickel alloy powder through gas atomization, screening the particle size, carrying out insulation coating, carrying out compression molding, carrying out heat treatment and carrying out impregnation and spraying. Wherein in the insulating coating process, a passivation solution is adopted to form an insulating layer on the surface of the iron-nickel alloy powder, and the passivation solution comprises 0.1 wt%-0.3 wt% of phosphoric acid, 0.1 wt%-0.6 wt% of sol and the balance deionized water according to the weight part of the iron-nickel alloy powder; and the pH value of the passivation solution is 4-7. According to the technical scheme, the iron-nickel alloy powder is subjected to insulation coating through cooperation of the phosphoric acid, the sol and the coating agent, the magnetic hysteresis loss is effectively reduced, the magnetic conductivity of the iron-nickel magnetic powder core is improved, the quality factor of the iron-nickel magnetic powder core is remarkably improved to 95 or above, and after the obtained high-magnetic-conductivity low-loss iron-nickel magnetic powder core is subjected to long-term high-temperature aging, the magnetic conductivity change rate does not exceed 2%; and the safety and the performance stability are greatly improved in the application of power electronic devices.

The invention discloses an energy-saving control method for a new-energy high-low-voltage direct-current relay. The energy-saving control method comprises the steps of analyzing a mapping relation between a silicon steel sheet stacking angle and a magnetic flux path deviation, calculating magnetic domain wall moving resistance according to magnetic domain boundary stress, determining a magnetic domain overturning speed by combining a magnetic field change rate, and measuring a hysteresis loop width parameter. Adjusting the width and frequency of the excitation current pulse according to the magnetic domain overturning frequency and the hysteresis loop offset and width to obtain an optimized excitation current pulse sequence, and determining the hysteresis loop expansion speed according to the hysteresis loop area change rate; the local high-temperature area temperature is analyzed through the iron core temperature rise rate, the local high-temperature area distribution and the magnetic domain energy dissipation data, if the local high-temperature area temperature exceeds the preset threshold value, the excitation current pulse is adjusted, stable iron core temperature rise control data is obtained, the coercive force change amplitude is determined, the magnetic hysteresis loss and the temperature rise are reduced, the stability of the relay under high-frequency switching is improved, and the reliability of the relay is improved. And the operation efficiency and reliability of the system are greatly improved.

The present disclosure relates to the technical field of iron and steel, in particular to an electrical steel with low iron loss and method for controlling tension thereof during decarburization annealing. A tension of each procedure of decarburization annealing of the electrical steel is controlled and adjusted respectively, and further combined with temperature of the decarburization annealing furnace, treatment time of the electrical steel in decarburization annealing furnace, and width and thickness of the electrical steel to prevent deflecting, cracking and narrowing of the electrical steel in the furnace and nodules on the bottom of roller. Compared with products of same brand, surface roughness and magnetic hysteresis loss of product are decreased by 10-20% and 10-15%.

The present disclosure relates to a hysteretance component, which is designed based on its definition, calculation formulas, and port characteristics. By increasing or decreasing hysteretance components in a magnetic circuit, the intensity and effect magnitude of magnetic hysteresis in a vector magnetic circuit can be estimated and controlled from the perspective of magnetic circuit, allowing the vector state of a magnetic flux to be consistent with the desired state. Based on this, an application method is proposed, involving that a target magnetic circuit is formed by connecting reluctance, magductance, and hysteretance components in series, and magnetic circuit parameters of the three components are utilized to quantitatively express magnetization, eddy current, and magnetic hysteresis phenomena, enabling technicians to selectively alter the operating characteristics of the magnetic circuit, vector magnetic quantities, and power of the magnetic circuit by adjusting the parameters.

A motor integrated with a signal collector and a magnetic hysteresis device, comprising a motor and a cover assembly, wherein the cover assembly comprises a cover, a circuit board assembly, an end cover, an outer magnetic ring, an inner magnetic ring and an iron core which are coaxially arranged; one side of the cover is fixed to a housing of the motor; two Hall sensing elements spaced apart from each other are provided on the end surface of a printed circuit board of the printed circuit board assembly; the center of the printed circuit board is fixed to a motor shaft; the outer ring of the printed circuit board is fixed to the cover; the iron core is arranged opposite to the printed circuit board; the center of the iron core is fixed to the motor shaft; the inner magnetic ring is fixed to an outer circle surface of the iron core by means of an inner hole formed; N poles and S poles are sequentially and alternately provided on an outer circle surface of the inner magnetic ring; the outer magnetic ring is sleeved outside the inner magnetic ring, and an air gap is formed between the outer magnetic ring and the inner magnetic ring; the outer magnetic ring is fixed to the inner wall of the end cover; and the inner side of the end cover is fixed to the other side of the cover. During the rotation of the motor, the two Hall elements measure the number of rotations of the motor by means of sensing the N poles and the S poles which are sequentially and alternately provided on the outer circle surface of the inner magnetic ring, and a magnetic hysteresis torque is generated between the inner magnetic ring and the outer magnetic ring.

A winding of the multi-pole magnetizing tool is formed by continuously distributing a plurality of winding wires in a wire slot, and the winding is configured to be distributed in a continuous and uniform n shape, so that when current passes through the winding, a first magnetic pole is formed on each n-shaped area of the winding, and a second magnetic pole is formed on each n-shaped area of the winding; a second magnetic pole opposite to the first magnetic pole in magnetism is formed between every two adjacent n-shaped areas, and meanwhile, the magnetic pole peak value P of the magnetized magnet to be magnetized corresponds to the distribution structure of the winding so as to accurately control the opening width a, the line distance b, the slot diameter c, the line diameter d and the pole distance e of the winding, so that fine regulation and control of magnetic field distribution are realized, and the symmetry of the magnetic poles is improved; the magnetic hysteresis and eddy-current loss are reduced, and each pole region of the to-be-magnetized magnet can obtain a more uniform magnetic field, so that the difference between a magnetic pole peak value and the pole width precision is reduced, and the performance of the to-be-magnetized magnet is improved.

The invention belongs to the technical field of electrolytes, and particularly relates to an electrolyte suitable for low temperature, a preparation method and a lithium battery, the electrolyte comprises a solvent, a lithium source, a film-forming additive and surface modified magnetic particles; according to the invention, the magnetic particles are added in the electrolyte, then the permanent magnet on the turntable rotates to form a variable magnetic field, due to the change of the magnetic field, the magnetic domains in the magnetic particles in the electrolyte in the battery pack can change along with the magnetic field, and due to the continuous change of the external magnetic field, the magnetic domains in the magnetic particles in the electrolyte in the battery pack can change along with the magnetic field. The magnetic particles are uniformly distributed in the battery pack, so that the electrolyte can be continuously and uniformly heated, and even if the temperature of the external environment is relatively low, the magnetic domains in the magnetic particles continuously move, the magnetic hysteresis loss phenomenon occurs in the movement process, and the temperature of the magnetic particles is further increased; and therefore, the low-temperature applicability of the electrolyte is improved.

The invention discloses a high-frequency linear electromagnet and a control method thereof, and relates to the technical field of electromagnetic control, the electromagnet comprises permanent magnet steel, a magnetizer, a magnet yoke, a motion shaft, an armature, a control coil and an elastic piece, the magnetizer and the armature form four groups of uniform air gaps, after the coil is electrified, the air gap magnetic field changes, electromagnetic acting force is generated, and the motion shaft is driven to move; the electromagnetic acting force is balanced with the reset force and the loading force of the elastic piece; the control method comprises the steps of prepositive verification, magnetic field state sensing, dual-mode driving adjustment, dynamic error feed-forward compensation, stability verification and adaptive parameter updating, interference such as hysteresis and temperature is counteracted by intelligently switching a quick response mode and a high-linearity mode and combining error compensation and adaptive parameter updating, and the stability of the magnetic field is improved. The invention has the advantages of fast high-frequency response, high control precision and stable operation, can be widely applied to high-precision high-frequency driving scenes, and improves the processing quality and efficiency.

The present invention relates to an electronic monitoring device for autonomously tracking, detecting and reporting the installation / re-installation and detachment / uninstallation of a wear element (GET) and a GET clamping element on an earthmoving machine. The device is installed in a cylindrical cavity in the GET. The electronic monitoring device and GET have an identifier code for maintaining continuous wireless communication despite the highly metallic surrounding environment, even reporting during transit. The electronic monitoring device manages its energy according to its operating status (“Standby”, “Installed Device”, “Installed GET” or “Detached GET”), and it has separate upper and lower twin sensing means, which detect the installation / re-installation and detachment / uninstallation through magnetic hysteresis curves, changes in amplitude of the standing wave in the transmission line of a resonant antenna, or changes in amplitude or phase of an RLC circuit with thermal normalisation, or changes in the self-frequency of a self-resonant RLC circuit; and an outer protective casing.

The application provides a constant torque screw cap with adjustable torque. The constant torque screw cap with adjustable torque comprises an output shaft sleeve, an end cover, a shell, a magnet assembly, an inner sliding sleeve, an outer sliding sleeve and a push rod assembly. The push rod assembly is arranged in the output shaft sleeve, the end cover and the shell are sleeved on the output shaft sleeve, the magnet assembly is assembled in the shell, the magnet assembly comprises two groups of permanent magnetic disks and a group of magnetic hysteresis disks, the two groups of permanent magnetic disks are symmetrically arranged, the magnetic hysteresis disk is arranged between the two groups of permanent magnetic disks, and the output shaft sleeve penetrates the inner hole of the magnetic hysteresis disk. The output shaft sleeve is axially fixed through a double-row deep groove ball bearing, a first sleeve, the magnetic hysteresis disk, a second sleeve and a circular nut. The end cover is fixedly connected with the permanent magnetic disk, and the end cover is assembled on the end face of the shell through magnetic adsorption of an O-shaped ring. The constant torque screw cap with adjustable torque is used for the screw cap equipment for precise control of the sealing torque of the bottle cap in the filling industry.

The application discloses a dynamic magnetic hysteresis model of amorphous / nanocrystalline alloy core considering stress dependence and temperature dependence, separates the magnetic field inside the amorphous / nanocrystalline alloy core according to the loss separation thought, and obtains corresponding magnetic field intensity by differentiating eddy current loss and residual loss with respect to magnetic flux density on the basis of the relationship between field quantity and energy, the magnetic hysteresis loss and the eddy current loss considering the stress dependence and the temperature dependence, and the dynamic magnetization characteristics generated by the eddy current loss and the residual loss of the amorphous / nanocrystalline alloy core. The dynamic magnetic field intensity of the amorphous / nanocrystalline alloy core is divided into the sum of the magnetic field intensities corresponding to the hysteresis loss, the eddy current loss and the residual loss based on the field separation technology and the loss statistical theory, and the dynamic magnetic hysteresis model of the amorphous / nanocrystalline alloy core under the influence of stress and temperature is established.

The application discloses a micro patch power inductor based on micro area 3D printing and a preparation method thereof, and belongs to the technical field of 3D printing micro inductor devices. The preparation method uses Fe-based soft magnetic powder as a magnetic phase raw material to prepare a 3D printing support medium; a micro area 3D printing method is used to print at least one group of coils and lead-out ends of the coils in the support medium, so that the coils and the lead-out ends are completely embedded in the support medium, and an inductor blank is formed; after the support medium and the inductor blank are separated, the inductor is prepared, the inductor is cleaned and silver-plated; the inductor after silver-plating is annealed, and a micro patch power inductor is prepared. The method can print micron-level coils, the prepared inductor has a smaller volume, can reach a wire diameter of 10 um, has a good yield, can be annealed, the magnetic permeability of the magnetic material is improved, the magnetic hysteresis loss is reduced, and the prepared inductor has higher electromagnetic performance under the same volume condition.

The invention discloses a loss separation method of a laminated iron core, which belongs to the technical field of energy and comprises the following steps: determining classic eddy-current loss according to a traditional formula; for a given frequency f0, frequency fi is selected, and the selection standard is that the condition number of the coefficient matrix of the loss linear equation set is smaller than a set threshold value; calculating abnormal eddy-current loss and magnetic hysteresis loss through a loss linear equation set or an abnormal eddy-current loss and magnetic hysteresis loss formula based on iron loss measurement data under different frequencies (f0, fi) and a classical eddy-current loss calculation value; using iron loss measurement data under different frequencies (f0, f1),..., (f0, fn) to repeatedly calculate abnormal eddy current loss and hysteresis loss; and calculating arithmetic mean values of the n abnormal eddy-current loss calculation results and the n magnetic hysteresis loss calculation results, wherein the final results are the actual abnormal eddy-current loss and the actual magnetic hysteresis loss. According to the method, a reliable data basis can be provided for laminated iron core or silicon steel sheet loss separation and iron loss calculation model construction.

The invention belongs to the technical field of data processing and self-adaptive control, and provides an elevator priority scheduling control method and system based on operation data, and the method specifically comprises the steps: firstly, arranging a thermal imager and a voltage sensor in an elevator operation scene, recording a temperature curve through the thermal imager, recording an excitation current curve in real time through the voltage sensor, and obtaining a temperature curve; then the impact loss risk of the current operation state is judged through the temperature curve and the excitation current curve, and finally whether elevator dispatching strategy priority change is conducted or not is judged according to the impact loss risk. The magnetic fatigue induction degree of an impact event caused by the fact that an electromagnetic brake cannot accurately judge the actual elevator stopping time under the condition of executing a variable-speed scheduling mode of passenger load self-adaptive speed adjustment is effectively quantified; the irreversible magnetic hysteresis loss occurrence risk is effectively reduced; therefore, the service life of the electromagnetic brake in the elevator is prolonged, the problem of energy consumption caused by gradual accumulation of elevator operation power consumption is prevented, and the safety of passengers during elevator working is guaranteed.

The utility model relates to high frequency power converter technical field, concretely is a kind of magnetic core structure suitable for high frequency power converter.The utility model, including coil and fixed frame, the coil is installed in the inner wall of fixed frame, the lower surface of fixed frame is fixedly connected with two connecting seats, the inside of connecting seat is installed with several pins, the inner wall of fixed frame is covered with insulating coating, the inner wall of fixed frame is movably installed with two ferrite magnetic cores, two the ferrite magnetic core adsorbs and connects, the surface of pin is covered with protection tube, the protection tube is silica gel tube, the surface of two the ferrite magnetic core is wound with fixed band, the fixed band is magnetic core fixed band.Solved under high frequency operating condition, the magnetic hysteresis loss and eddy current loss of magnetic core sharply increase, lead to the serious heating of magnetic core, not only reduce the conversion efficiency of power converter, also possibly influence its long-term reliability problem.

The invention discloses an electromagnetic coil heat dissipation system, and relates to the technical field of electromagnetic coils, the electromagnetic coil heat dissipation system comprises an electromagnetic clutch, an electromagnetic coil is installed in the electromagnetic clutch, a rotating shaft is installed below the electromagnetic clutch, an internal and external heat dissipation assembly is arranged in the electromagnetic clutch, and the internal and external heat dissipation assembly comprises a collecting cylinder, an external communicating pipe and an internal branch pipe; when the rotating shaft continuously rotates, the collecting cylinder firstly absorbs air outside the electromagnetic clutch through the outer communicating pipe, and efficient heat management of heating points in the electromagnetic clutch, namely operation heating of an electromagnetic coil is achieved. The radial air outlet design enables air flow to be quickly discharged in the direction aiming at the positions of the electromagnetic coil and the iron core, a heat dissipation path penetrating through the core heating body is formed, and by means of the directional air flow organization mode, cold air can make full contact with the electromagnetic coil and take away heat generated by resistance loss, magnetic hysteresis loss and eddy current loss.

The application discloses a transformer rectifier-based fault detection method and system, and relates to the technical field of electrical engineering, comprising the following steps: S001, a cross-frequency steady-state to dynamic continuous observation baseline is established under different frequency excitation conditions, a magnetic communication signal, a current signal and a temperature rise signal are synchronously collected, and a micro-amplitude polarization marker is injected, which is used for tracking energy flow and constructing a multi-parameter coupling graph with time evolution characteristics; S002, based on the multi-parameter coupling graph, a causal coherence decomposition is performed, the transient bending rate deviation of the magnetic hysteresis loop under frequency change is identified, the energy imbalance parameter generated by the magnetic flux response lag is extracted, and the potential instability area in the feedback link is calibrated. The application realizes multi-parameter coupling graph construction and causal instability identification, predicts energy abnormalities through counterfactual playback and frequency replacement, realizes rapid electromagnetic recoil extinction combined with reversible time grid and conjugate injection, and improves system safety and self-healing ability.

The invention relates to the technical field of transverse shearing, in particular to a mutual inductor machining iron core silicon steel sheet transverse shearing device for reducing hysteresis loss, which comprises an iron core silicon steel sheet transverse shearing machine, a conveying mechanism is arranged at the bottom of the iron core silicon steel sheet transverse shearing machine, and a reduction mechanism is arranged on the surface of the conveying mechanism. The conveying mechanism comprises a conveying assembly, a transmission assembly, a limiting assembly, a guiding assembly and a flow conveying assembly, the conveying assembly is arranged at the bottom of the iron core silicon steel sheet transverse shearing machine, the transmission assembly is arranged on the right side of the front side of the conveying assembly, and the limiting assembly is arranged on the inner side of the conveying assembly. The iron core silicon steel sheet transverse shearing device for reducing the magnetic hysteresis loss for mutual inductor machining is provided with a structure for dissipating heat generated by the magnetic hysteresis loss at the iron core silicon steel sheet of the mutual inductor by utilizing negative pressure extraction, so that the heat at the iron core silicon steel sheet of the mutual inductor can be dissipated; therefore, the magnetic hysteresis loss efficiency is reduced when the iron core silicon steel sheet of the mutual inductor is subjected to transverse shearing processing.

The utility model relates to the related technical field of linear sliding rails, and discloses a linear sliding rail buffering mechanism which comprises a base, two sets of sliding rails symmetrically arranged are installed on the base, a sliding block is connected to the sliding rails in a sliding mode, an installation frame is arranged on the inner side of the sliding block, an inserting groove is formed in the installation frame, and an adjusting groove is fixedly connected to the installation frame. A connecting block is arranged between the adjusting grooves, a copper pipe is fixedly connected to the bottom of the connecting block, fixing bases are fixedly connected to the base, an electromagnet is fixedly connected between the fixing bases, the copper pipe is slidably connected to the outer wall of the electromagnet, and a controller is installed at the control end of the electromagnet. Inertia force generated when the sliding block slides is buffered through the hysteresis effect between the copper pipe and the magnet, meanwhile, the magnitude of the hysteresis force between the copper pipe and the magnet can be accurately controlled by adjusting the magnetic field strength on the magnet, and therefore accurate buffering on the sliding rail is achieved. And moreover, the adaptability of the equipment can be improved through the arrangement of the adjusting groove.

The present invention relates to a magnetic capacitor element. The design of the magnetic capacitor element is implemented on the basis of the definition of the element, calculation formulas, and port characteristics. By adding or removing a magnetic capacitor element in or from a magnetic circuit, the strength of magnetic hysteresis in a vector magnetic circuit can be estimated and controlled from the perspective of the magnetic circuit, and the magnitude of the effect caused by magnetic hysteresis is controlled, so that a magnetic flux vector state in the magnetic circuit is consistent with a target magnetic flux vector state. Further, on this basis, an application method is proposed. The magnetic capacitor element is connected in series to a magnetic resistor element and a magnetic inductor element to form a target magnetic circuit. Magnetic circuit parameters corresponding to the three magnetic circuit elements quantitatively represent three physical phenomena, i.e., magnetic resistance, eddy current, and magnetic hysteresis, in the magnetic circuit. By changing different magnetic circuit parameters, a technician can change the operating characteristics of the magnetic circuit in a targeted manner, thereby purposefully changing the vector magnetic quantity and magnetic circuit power in the magnetic circuit.

The invention relates to the technical field of magnetic core preparation, and provides a magnetic core, electrical equipment and a preparation method of the magnetic core, and the magnetic core comprises at least two layers of magnetic sheets and a bonding layer. And the at least two layers of magnetic sheets are laminated. A bonding layer is arranged between any two adjacent magnetic sheets; the magnetic core has a cut surface, the flatness Fl of the cut surface is less than or equal to 2 [mu] m, and the roughness Rz of the cut surface is less than or equal to 1 [mu] m; all the magnetic sheets and all the adhesive layers intersect with the cut surface. Therefore, the magnetic core shows the characteristic of magnetic anisotropy, and then the magnetic conductivity has different values in different directions. And the magnetic conductivity is higher in the easy magnetization direction, so that the magnetic conductivity of the magnetic core can be improved by utilizing the easy magnetization direction of the magnetic core. In addition, hysteresis loss and eddy-current loss of the magnetic core can be reduced. After the cut-off surfaces of the two magnetic cores abut against each other, the width of the gap between the two cut-off surfaces can meet the installation requirement of the magnetic cores, and therefore the standard of the appearance of the cut-off surfaces of the magnetic cores can be met.

The invention discloses a hysteresis flexible sound insulation board and a manufacturing method, which belongs to the field of industrial sound insulation and vibration isolation. A hysteresis flexible sound insulation board manufacturing method comprises the following steps: stirring flexible particles, ferromagnetic particles and glue for 15 to 20 minutes to form a mixture, then moving the mixture into a mold, slowly applying pressure to the mixture for molding, and applying a magnetic field to the mixture while applying pressure, so that the ferromagnetic particles adjust their directions due to the magnetic field, stopping pressurization and applying the magnetic field after the mixture is formed, taking out the formed mixture, applying the magnetic field again after cooling, and applying the magnetic field to the mixture again, wherein the applied magnetic field strength is the same as the magnetic field strength applied during the molding process, and stopping applying the magnetic field after 25 to 35 minutes to form a hysteresis flexible sound insulation board. The hysteresis flexible sound insulation board and the manufacturing method of the invention improve the strength, rigidity and damping effect of the hysteresis flexible sound insulation board, and improve the sound insulation and vibration isolation effects of the hysteresis flexible sound insulation board.

The utility model relates to the technical field of motors, in particular to a motor stator core. The motor stator core comprises a plurality of punching sheets, a plurality of pear-shaped grooves extending along the radial direction are uniformly distributed on the inner circumference of each punching sheet, and two adjacent surfaces of each pear-shaped groove are in fillet transition, so that magnetic field concentration of sharp edges is eliminated, and the problem of overhigh local magnetic flux density is reduced; the arc-shaped structure of the pear-shaped groove can provide a smoother magnetic path, magnetic resistance is reduced, magnetic lines are distributed more reasonably, magnetic hysteresis loss is reduced, and a magnetic circuit is improved. All the punching sheets are stacked in the axial direction, the pear-shaped grooves in all the punching sheets are in one-to-one correspondence to form a plurality of inclined notches, and compared with original vertical notches of the stator iron core, the inclined notches of the stator iron core have the advantages that the space for accommodating windings is increased, and the magnetic field density is improved. And the inclined notches enable the stator teeth and the rotor teeth to be not completely aligned, so that the tooth harmonic phases are different and mutually offset, thereby weakening the overall harmonic, reducing the electromagnetic noise and vibration, and further improving the motor performance.

The invention belongs to the technical field of intelligent monitoring and maintenance of industrial equipment, and discloses a full-life-cycle intelligent early warning and maintenance method for a permanent magnet pump driven by a large model. Acquiring electrical and thermodynamic parameters of the permanent magnet pump in operation, and constructing a temperature field distribution map; a hysteresis loop dynamic evolution model is constructed based on the back electromotive force waveform and the temperature field, the offset of the working point is calculated, and a critical demagnetization area is identified; extracting temperature historical track data, constructing a thermal-magnetic coupling lag characteristic spectrum, and calculating a reversible recovery coefficient and an irreversible damage coefficient; constructing a demagnetization state discrimination model embedded with physical boundary constraints, and generating a demagnetization state feature vector containing a temperature attribution label through cross-domain feature fusion; component decomposition of the magnetic flux attenuation signal is realized, reversible thermal attenuation and irreversible demagnetization components are distinguished, and an early warning grade and a maintenance measure are output based on a dynamic proportion coefficient. The accuracy of demagnetization risk assessment of the permanent magnet pump is improved, and the service life of equipment is prolonged.

The present application belongs to the technical field of motor testing, and discloses a micro-torque motor power testing system and testing method, wherein the testing system comprises a support, an adjusting screw, a permanent magnet disc, a magnetic hysteresis disc, an output shaft, a torque calibration disc and a torque measuring device; the adjusting screw is erected on the support, one end of the adjusting screw is a handle, and the other end is the permanent magnet disc; the output shaft is erected on the support, one end of the output shaft extends out of the support and is detachably connected with the torque calibration disc, and the other end of the output shaft is the magnetic hysteresis disc; the disc surface of the permanent magnet disc is opposite to the disc surface of the magnetic hysteresis disc, the permanent magnet disc is provided with alternately distributed permanent magnets, and the magnetic hysteresis disc is made of magnetic damping material; and the torque measuring device is connected with and measures the rotating torque of the torque calibration disc. The present application solves the problem that the torque of a motor is difficult to balance the dynamic friction force generated by a rope when the testing torque is small, has high testing precision, and the overall investment is only 5% of the imported equipment, thereby greatly reducing the testing cost.

The invention provides a large-current inductor. The large-current inductor comprises a shell, a middle column and a coil. The at least two coils are sequentially wound on the middle column and are used for generating an inductive effect through accessed current; a wiring end of the coil penetrates through the shell to form a pin, and the pin is used for being connected with a circuit board; the shell is provided with a containing cavity, and the containing cavity is used for containing the middle column and the coil; the ui value of the shell is 900 to 3500, and the Bm value of the shell is 0.4 T to 0.6 T. By means of the stable saturation current curve characteristic of the ferrite magnetic core material, the large-current inductor can maintain stable current linearity, and the current stability of the inductor is improved. In addition, the ferrite magnetic core has higher surface impedance and small high-frequency eddy current loss and magnetic hysteresis loss, so that the characteristic of low loss can be maintained at higher switching frequency, and the high-frequency application requirement is met.