23 results about "Low magnetic field" patented technology

The utility model relates to copper wire production technical field, concretely relates to a kind of copper wire production and processing's stretching device, including lubricating bucket and the conveying part for being immersed into the copper wire in lubricating bucket;Electromagnetic rod is located in lubricating bucket, it includes the sealing sleeve coaxially fixed in lubricating bucket and the electromagnetic coil coaxially located in sealing sleeve, for generating strong magnetic field and drive copper powder to the arc-shaped inner wall of lubricating bucket, fishing part is located in lubricating bucket, it includes the fishing ring coaxially slidingly located in lubricating bucket, the outer edge of the fishing ring contacts the inner wall of lubricating bucket.The utility model generates strong electromagnetic field by electromagnetic rod, since copper powder belongs to inverse magnetic material, it generates induced eddy current in alternating magnetic field, and then generates reverse magnetic field, forms repulsion with magnetic field source Lorentz magnetic force and is pushed to low magnetic field area by magnetic repulsion, copper powder can be pushed to the arc-shaped inner wall of lubricating bucket and gathered in real time, greatly extend the period of lubricating liquid cleaning or replacement, reduce its cleaning or replacement frequency.

A design method for a double-layer, double-plane self-shielded coil significantly reduces magnetic field crosstalk and shielding barrel coupling effects, improving magnetic field stability and space utilization. It is suitable for coil design and integration applications in high-precision magnetic field control systems. A target field model is established based on the target magnetic field distribution, and magnetic flux constraints ensure that the external magnetic field of the coil approaches zero, thus achieving self-shielding characteristics. Subsequently, a stream function discretization method is used to obtain the coil winding path, and a mapping relationship and current scaling factor between the inner and outer coil layers are established to ensure that the double-layer coil effectively cancels out the external magnetic field while generating the target magnetic field. To further optimize magnetic field uniformity and energy distribution, this invention introduces a tornado optimization algorithm for global optimization of the coil distribution, thereby obtaining a coil structure with high uniformity and high attenuation performance. Finally, finite element simulation is performed on the coil shape to analyze whether its uniformity and attenuation meet the design requirements.

The utility model provides a kind of device for testing the influence of magnetic field on insects, it is related to experimental device technical field, including testing device cabinet, the testing device cabinet inside bottom end is fixedly connected with test box, two sealing baffles are provided in the test box, the testing device cabinet one side is provided with the magnetic field generating device for generating magnetic field, test is carried out by the principle that magnetic field intensity is exponentially reduced with distance, according to the migration condition of insects inside test box, determine the most suitable magnetic field interval, in the detection process, if insects migrate to the lowest magnetic field interval, magnetic field can be further reduced, such as moving to high magnetic field interval, then further improve magnetic field.

This invention relates to the field of thermal management technology, specifically to a magnetic functional thin film and a thermal interface material. The magnetic functional thin film comprises an acrylate polymer matrix and iron oxide-coated carbon fibers dispersed in the acrylate polymer matrix; the iron oxide-coated carbon fibers are oriented along the thickness direction of the magnetic functional thin film. This invention achieves efficient oriented alignment of carbon fibers under low magnetic field strength through a strategy of "magnetic coating + low magnetic field induction + ultrasonic vibration synergy," significantly improving the vertical thermal conductivity of the film while endowing it with excellent flexibility and mechanical strength. It can be widely used in fields such as chip heat dissipation, flexible electronics, and 5G communication equipment.

A kind of design method and sensor of wide-range current sensor based on magnetomotive effect, in the method, magnetomotive body is provided and the magnetomotive body is arranged between energized conductor and magnetic field sensor sensing chip;The magnetic flux density at the position of the magnetic field sensor sensing chip is reduced by the magnetomotive effect of the magnetomotive body, so that the magnetic field sensor sensing chip remains linear response in wide current range, and wide-range current measurement is realized.By the action of high magnetic permeability magnetomotive body, the magnetic flux density at the position of TMR sensing chip is significantly weakened, so that the sensor magnetic saturation phenomenon is effectively delayed.The method significantly widens the current measurement range of the sensor under the premise of maintaining small size, and realizes the breakthrough of traditional TMR current sensor in wide-range measurement field.

This invention provides a self-starting synchronous reluctance motor rotor, a motor, and a compressor. The self-starting synchronous reluctance motor rotor includes a rotor core and end rings. The rotor core includes a first rotor lamination and a second rotor lamination. The first rotor lamination has a first filling groove, a second filling groove, and a slit groove. The first filling groove and the slit groove are arranged in the same layer. The second filling groove is located on the outermost layer in the q-axis direction of the rotor and is not in the same layer as the slit groove. The second rotor lamination can completely or partially cover the second filling groove on the first rotor lamination. According to this invention, harmonics generated by eddy currents in the second filling groove can be reduced, the harmonic content of the motor can be reduced, the torque ripple rate and vibration noise of the motor can be improved, and the reliability of motor operation can be enhanced. By effectively reducing magnetic field harmonics, torque ripple and vibration noise problems caused by harmonics can be avoided.

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.

This invention discloses a method and system for optimizing the magnetic field of a counterpolar high-temperature superconducting magnet device, relating to the field of induction heating technology. The method includes: acquiring induction heating characteristic numbers of the counterpolar high-temperature superconducting magnet device to be optimized; determining the type of the counterpolar high-temperature superconducting magnet device based on the induction heating characteristic numbers, and determining the core topology and optimization parameter set within the counterpolar high-temperature superconducting magnet device based on the type of the device; and determining the target parameter combination for magnetic field optimization from the optimization parameter set according to preset rules, using the temperature distribution of the counterpolar high-temperature superconducting magnet device after heating as the optimization objective. This invention solves the problems of poor adaptability, low magnetic field control precision, and low efficiency of multi-parameter optimization in existing technologies for optimizing the magnetic field of counterpolar high-temperature superconducting magnet devices.

The application provides an echo wall mode microcavity magnetic sensor and a detection method. The echo wall mode microcavity magnetic sensor comprises an echo wall mode microcavity, a magnetostrictive layer and a base. The magnetostrictive layer is in contact with the echo wall mode microcavity, and the base is in contact with the echo wall mode microcavity and used for supporting the echo wall mode microcavity. The application combines the echo wall mode microcavity with the magnetostrictive layer, so that the magnetostrictive layer produces resonance under a magnetic field to produce a mechanical response, thereby changing the optical path length of the echo wall mode microcavity in contact with the magnetostrictive layer, further changing the resonance frequency of the echo wall mode microcavity, and the size of the magnetic field and the movement of the resonance frequency are in linear relationship, so that the echo wall mode microcavity magnetic sensor has high sensitivity and is suitable for different magnetic field detection, especially for biological magnetic detection with low magnetic field strength and low frequency.

The application discloses a permanent magnet complementary axial flux reverse motor and belongs to the technical field of axial flux motors. The motor comprises a single-stator assembly, rotors are arranged on the two sides of the single-stator assembly, and an axial air gap is arranged between the rotors and the single-stator assembly. The single-stator assembly comprises a stator core and stator teeth which are arranged on the outer side of the stator core at equal intervals in the circumferential direction. A complementary permanent magnet assembly is arranged on the stator teeth. The complementary permanent magnet assembly comprises first-type permanent magnets arranged along the axial end surface of the stator teeth and second-type permanent magnets arranged along the circumferential side of the stator teeth. In normal operation, the axial magnetomotive force of the first-type permanent magnets and the circumferential magnetomotive force of the second-type permanent magnets are vector superposed, so that the air gap magnetomotive force with a higher sine degree is synthesized, and the magnetic field harmonic distortion is significantly reduced. Meanwhile, the axial flux forms a main path through the double rotors and the air gap, the circumferential flux forms an auxiliary path along the side of the stator teeth, and the two paths meet at the root of the stator teeth to form a three-dimensional closed magnetic circuit, so that the magnetic circuit utilization rate is improved, and the core loss is reduced.

This invention discloses a gadolinium-erbium aluminum soft magnetic material with the chemical formula Gd 3‑x Er x Al2, wherein the rare earth elements are gadolinium (Gd) and erbium (Er), x = 0–0.5. This invention also discloses a method for preparing gadolinium-erbium aluminum soft magnetic material. This invention can obtain soft magnetic materials with adjustable Curie temperature, moderate magnetic entropy change under low magnetic fields, and high cooling capacity.

The application discloses a kind of strong magnetic field environment under mobile robot adaptive control system and method, this control system includes: laser radar, for the map construction of the operation scene of robot, in the operation process, to obtain positioning data by the positioning of operation scene and its scene map to the position where robot is located;Magnetic sensor, for the magnetic field data of the position where robot is located is collected;Control device, laser radar is electrically connected by shielding link and magnetic sensor is electrically connected by shielding link, for the magnetic field region calibration and abnormal detection of operation scene according to the positioning data of laser radar and the magnetic field data of magnetic sensor.The application, control system is installed in robot equipment, shielding link can reduce the interference of magnetic field environment to positioning data, magnetic field data, improve the precision control of system, applicable to robot work in different magnetic field environment, without relying on artificial preset parameter, can satisfy high reliability, fine operation demand.

This invention belongs to the field of metallic materials technology, specifically relating to a Fe-Si-B iron-based amorphous alloy thin strip with high saturation magnetic induction intensity, its preparation method, and its applications. The mass percentage expression of the alloy is Fe... (100‑x‑y) Si x B y Where x is 0.2–3.5 and y is 2–4.5, and 4.2 ≤ x + y ≤ 5.5. This invention optimizes the soft magnetic properties of Fe-Si-B amorphous alloys by adjusting the addition ratio (x:y) of the metalloid elements Si and B, reducing their coercivity, and obtaining Fe-based amorphous alloys with excellent soft magnetization properties. The preparation method is simple and easy to implement, does not contain expensive metals, and has low development costs. The magnetization of this amorphous alloy increases sharply with the increase of the magnetic field under low magnetic field conditions and then gradually reaches saturation, exhibiting typical soft magnetic properties. It is particularly suitable for manufacturing cores of soft magnetic devices such as high-efficiency distribution transformers, drive motors for new energy vehicles, and high-frequency inductors.

The application discloses a europium-based molybdate material, a preparation method thereof and application of the europium-based molybdate material in a very low temperature magnetic refrigeration material, and relates to the field of magnetic refrigeration materials. The chemical structural formula of the europium-based molybdate material is EuMoO4, the europium-based molybdate material has a secondary magnetic phase change below 1K temperature, and can be applied to preparation of a very low temperature magnetic refrigeration material. The europium-based molybdate material has a secondary magnetic phase change under the condition of 1K temperature, and the volume magnetic entropy change of the europium-based molybdate material under a low magnetic field is obviously higher than the maximum volume magnetic entropy change of an existing magnetic refrigeration material under the same magnetic field change, so that the europium-based molybdate material is a very low temperature magnetic refrigeration material with excellent performance. The europium-based molybdate material is synthesized by using a solid phase reaction method, the preparation process is simple, energy consumption is low, and the europium-based molybdate material is suitable for large-scale industrial production.

The application discloses a stator core, a stator, a motor, a constant-frequency variable-speed compressor and a refrigeration device, and belongs to the refrigeration field. A plurality of stator tooth portions of the stator core are arranged in a circumferential interval along an inner circumferential wall of a stator yoke portion of the stator core, a stator slot is formed between adjacent stator tooth portions, sizes of the plurality of stator slots are same, and the sizes satisfy 0.3<=W / (R-r)<=0.9, wherein W is a slot depth of the stator slot, R is a radius of an inscribed circle of an outer wall of the stator core, and r is a stator inner diameter. The stator core of the application can increase a cross-sectional area of a magnetic flux circulation of the stator core, reduce a magnetic field saturation degree, and thus improve motor efficiency by setting a proportional relationship between the stator slot and the stator yoke portion.

This invention discloses a method for preparing high-performance permanent magnet composite powder, belonging to the field of magnetic materials technology. The preparation method includes: manganese (Mn) oxide, bismuth (Bi) oxide, and Sm2Fe oxide of a certain particle size. 17 Alloy powders are mixed in a specific mass ratio and ball-milled in a planetary ball mill under nitrogen protection, followed by ball-milling in a high-energy ball mill jar under nitrogen protection. Simultaneously, reduced CaO powder with a particle size of 10-50 nm is added to the ball mill jar via spraying. The mixed powder is then subjected to a reduction reaction under a low magnetic field-assisted heat treatment in an argon-hydrogen mixed atmosphere, ultimately yielding high-performance MnBi / SmFeN permanent magnet composite powder. This invention features a simple and easy-to-operate process, facilitating the application of high-performance permanent magnet composite powders in a wider range of permanent magnet devices to meet market demands.

The utility model relates to soft water valve technical field especially relates to a kind of soft water valve and soft water machine, soft water valve includes control valve body, drive assembly, eccentric shaft and piston, eccentric shaft is arranged in control valve body, drive assembly is connected with eccentric shaft transmission;Eccentric shaft includes main shaft part and eccentric part, piston is connected with eccentric transmission;Main shaft part is provided with magnetic piece, control valve body is provided with the Hall induction component corresponding with magnetic piece, magnetic piece has different magnetic induction intensity in the different direction perpendicular eccentric shaft axial direction, to reduce the magnetic field source, significantly reduce magnetic field interference risk, the magnetic induction intensity of magnetic piece is continuously changed with angle, Hall induction component can be through detecting the continuous difference of magnetic field intensity, realize the stepless identification of angle, to accurately judge piston position, improve the precision and reliability of piston position detection. And simultaneously simplify the structure and quantity of magnetic piece and Hall induction component, reduce mechanical failure rate, reduce maintenance cost.

The application provides a spin valve magnetic sensing array based on a Wheatstone bridge and a preparation method thereof. Based on the problem of poor linearity of a conventional spin valve magnetic sensor under a low magnetic field, the application introduces a Wheatstone bridge structure, utilizes a differential measurement and a signal amplification mechanism, and achieves the technical effect of effectively improving the linear response of the sensor in a low magnetic field range.

The utility model provides a kind of structure applied to magnetic energy fresh-keeping of refrigerator, more particularly in the technical field of refrigeration equipment.The magnetic energy fresh-keeping structure includes upper magnetic field component and lower magnetic field component;The upper magnetic field component is arranged in the recess on the door body door lining;The lower magnetic field component is fixed in the cabinet body shell bottom by mounting shell.The utility model is configured with upper magnetic field component and lower magnetic field component respectively opposite in the refrigerator door lining inside and cabinet body shell bottom, by electromagnetic coil cooperation magnetic conducting sheet, so that the static magnetic field generated by permanent magnet and the dynamic magnetic field generated by electromagnetic coil are mutually superposed, and then optimize the magnetic field environment inside ice cabinet, improve food fresh-keeping effect, delay food deterioration, effectively reduce the loss of moisture and nutrient components.

A method for calibrating and determining the error of a magnetometer is disclosed. The error calibration method includes the following steps: obtaining a dataset; preprocessing the raw magnetometer data in the dataset to obtain magnetic field data; constructing a total error model of the magnetometer; based on a weighted least squares algorithm, constructing a diagonal weight matrix inversely proportional to the noise variance of the attitude angle and magnetic field data in the dataset; linearizing the total error model of the magnetometer, and using the diagonal weight matrix, iteratively updating the parameters to be estimated in the total error model of the magnetometer with the objective function of minimizing the sum of squared weighted residuals, repeating the iterative process until a preset convergence criterion is met, to obtain the calibration parameters of the total error model of the magnetometer; the above technical solution effectively reduces the magnetic field measurement error, and the calibration parameters can be directly applied to real-time error compensation during the working stage of the magnetometer, ensuring measurement accuracy.

The application discloses an energy recovery type electric tensioner for an overhead line and a method, relates to the technical field of overhead power transmission line construction equipment, and comprises a tension control mechanism arranged on a rack; the tension control mechanism comprises a mounting rack, a first driving mechanism and a fine adjustment mechanism; wherein the mounting rack is slidingly connected to the rack, and a cable is tensioned on the mounting rack; the first driving mechanism is installed on the rack and is used for driving the mounting rack to slide on the rack so as to control the tension of the cable; and the fine adjustment mechanism is installed on the mounting rack and is used for controlling the tensioning distance between the cable and the mounting rack. Through the first driving mechanism and the fine adjustment mechanism, the precision of coarse adjustment and fine adjustment is superposed, a pure mechanical tension control chain is adopted, the tension measurement error in a magnetic field is reduced, and the tension control precision is improved; and a double-stage control system is formed through the first driving mechanism and the fine adjustment mechanism, so that the tension adjustment range is ensured.