9 results about "Magnetic energy" patented technology

This application belongs to the field of metal electromagnetic high-speed forming manufacturing technology, specifically disclosing a method and system for obtaining an electromagnetic forming actuator. The method includes: determining the basic structural parameters of the electromagnetic forming actuator with the goal of maximizing the magnetic energy utilization efficiency and the electromagnetic force impulse on the workpiece; obtaining the bottom morphology function of the electromagnetic forming actuator based on the electromagnetic forming force field requirements, and determining the parameters to be optimized and their value ranges in the bottom morphology function; determining a typical deformable workpiece configuration based on the workpiece deformation process and the target forming shape; calculating the weighted average of the magnetic field distribution uniformity index and magnetic energy efficiency of the electromagnetic forming actuator with different bottom morphology parameters on the typical deformable workpiece configuration; and selecting the optimal bottom morphology parameters based on a multi-objective optimization model with the goal of improving the magnetic field uniformity and magnetic energy efficiency. This application fundamentally solves the problem of uneven electromagnetic force caused by the structure of the electromagnetic forming actuator.

The present disclosure relates to a sintered neodymium-iron-boron magnet and a method for preparing the same, the magnet comprising a main phase and a grain boundary phase, a ratio of an average grain size of a surface layer of the magnet to an average grain size of a central region of the magnet being 1.05-1.35; wherein the surface layer of the magnet refers to a region at a distance of 35 μm or less from a surface of the magnet; and the central region of the magnet refers to a region at a distance of 500 μm or more from the surface of the magnet. The sintered neodymium-iron-boron magnet has a sum of a maximum magnetic energy product (BH)max and an intrinsic coercivity HcJ of greater than 80; and a remanence Br of greater than 13 KGs; the maximum magnetic energy product (BH)max has a unit of MGOe, and the intrinsic coercivity HcJ has a unit of KOe.

An ion-permeation energy conversion device and its control method based on light and magnetic energy regulation are disclosed. When the ion-permeation energy conversion device is in working condition, the magnetic field strength of the permanent magnet is adjusted to disperse the magnetic nanoparticles, and the concentrator is adjusted to heat the ion-permeation energy conversion device body with photothermal magnetic nanoparticles to improve power generation performance. When the ion-permeation energy conversion device is in non-working condition, the magnetic field strength of the permanent magnet is adjusted to distribute the magnetic nanoparticles at the interface between the nanoselective membrane and the low-concentration reservoir to prevent ion transport, and the concentrator is adjusted to make the light intensity on the nanoselective membrane exceed the threshold to form a reverse driving force, further hindering ion diffusion and synergistically solving the self-discharge problem of the ion-permeation energy conversion device body.

This invention relates to the field of magnetic therapy equipment design technology, and discloses a magnetic circuit analysis method for a permanent magnetic field sleep magnetic therapy device. The method includes stimulation mode design, static magnetic circuit operating point selection, self-demagnetization effect guidance design, and finite element simulation verification. The stimulation mode design includes static and dynamic modes. Static magnetic circuit operating point selection determines the maximum magnetic energy accumulation point by constructing a load line using characteristic points of the demagnetization curve and correcting the operating point coordinate ratio. The self-demagnetization effect guidance design employs a closed magnetic circuit structure, reverse compensation magnetic ring installation, and magnetic domain stabilization treatment. Finite element simulation verification constructs a coupling model between the magnetic therapy device and human tissue. These four parts are executed sequentially and interconnected to form a closed loop. This method solves the problems of low magnetic energy utilization and significant self-demagnetization impact in traditional magnetic circuits, achieving precise magnetic field focusing and stable magnetic circuit operation, thus meeting the needs of sleep therapy.

A multi-winding high-frequency transformer leakage inductance analytical calculation method, comprising: determining the number of leakage inductances of the secondary winding corresponding to different primary windings according to the number of primary and secondary windings of the multi-winding high-frequency transformer; dividing the leakage magnetic energy region corresponding to different leakage inductances into winding interlayer insulation region, winding insulation region, through-flow winding region and open-circuit winding region; deriving the magnetic field intensity of the winding interlayer insulation region and the winding insulation region; deriving the magnetic field intensity of the through-flow winding region and the open-circuit winding region based on Maxwell's equations; further integrating the corresponding leakage magnetic energy according to the magnetic field intensity of each region; calculating the leakage magnetic energy corresponding to each leakage inductance according to the different leakage magnetic energy calculation region of each leakage inductance, summing the leakage magnetic energy of the corresponding region, and then calculating the leakage inductance parameters according to the magnetic field energy method. The method considers the open-circuit winding unique in the leakage inductance calculation process of the multi-winding high-frequency transformer, and accurately calculates the leakage magnetic energy of the open-circuit winding.

This invention discloses a magnetic energy harvesting circuit and a maximum power point tracking (MPPT) method suitable for constant voltage loads. The magnetic energy harvesting circuit utilizes a series capacitor to extend the energy transfer window, a parallel switch to adjust the position of the energy transfer window, and active rectification to reduce conduction losses. The combined use of these three technologies effectively improves the power density of the magnetic energy harvesting circuit under constant voltage loads. The MPPT method, by controlling the conduction time of the parallel switch when the AC current amplitude of the transmission line changes, can track the maximum power point at the corresponding AC current amplitude within half an AC cycle.

The application relates to an inductive coupling-based impulse current generating device and method, which generates impulse current through electromagnetic induction principle and comprises a primary drive module for energy input, a magnetic coupling core module for magnetic energy conversion, a secondary induction module for current output and a waveform regulation module for waveform regulation. The secondary current waveform is collected in real time, the wavefront time, the half-peak time and the secondary impulse current peak value are calculated based on an optimization formula and compared with set values, if the waveform parameters or the current peak value deviate more than the set threshold value, the waveform regulation module and the correction coefficient are adjusted. Compared with the prior art, the application can realize impulse current output and high-frequency lightning current transient characteristic simulation, and provide high-precision and high-efficiency test technical support for lightning protection performance verification of power equipment.

This invention discloses a structure and method for suppressing feedback from an electric guitar's built-in speaker enclosure. The structure includes a speaker enclosure within the guitar body, with a frame featuring a sound outlet on the pickup side. A speaker is fixed inside the enclosure. The frame is a conductive, continuous, non-ferromagnetic metal structure with a conductivity of not less than 30 MS / m, located on the magnetic field coupling path between the speaker and the pickup, surrounding the speaker and with its edge radially outside the speaker magnet, to induce eddy currents to attenuate leakage magnetic flux. The method involves placing the aforementioned metal frame on the path, utilizing the induced eddy currents to generate a reverse magnetic flux to cancel out leakage magnetic energy and block positive feedback of electromagnetic coupling. This invention achieves passive feedback suppression, with high suppression efficiency in the 1kHz~10kHz frequency band, requiring no modification to the original production process, causing no sound quality loss, and is low in cost and highly applicable.

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.