337 results about "Magnetic field coupling" patented technology

The invention relates to the field of servo motor parameter optimization, in particular to a magnetic field simulation and parameter optimization method and system for a permanent magnet servo motor rotor. The method comprises the following steps: acquiring a rotor global magnetic field monitoring curve in the operation process of a servo motor rotor, and constructing a global magnetic field accurate compensation model; performing regional magnetic circuit structure analysis on the global magnetic field accurate compensation model, performing dynamic magnetic field logic mapping modeling, and constructing a real-time regional magnetic field logic map; performing magnetic field state change analysis on the global magnetic field accurate compensation model, performing multi-node change track correlation analysis, and constructing a multi-node magnetic field coupling dependency network; and performing short-term magnetic field evolution prediction based on the multi-node magnetic field coupling dependency network, and performing comprehensive electromagnetic performance evaluation to obtain an electromagnetic performance evaluation report. According to the method, the sudden change of the magnetic field is accurately and quickly identified, so that the magnetic field parameters are iteratively adjusted and optimized, and the service life and the performance of the servo motor are improved.

The invention relates to an anti-offset wireless charging coupler for an underwater vehicle, which solves the problem that the multi-dimensional offset charging efficiency is reduced due to ocean current by adopting the collaborative design of a grouped serial-wound transmitting end and a geometric adaptive receiving end. The transmitting end is formed by connecting an outer ring winding and an inner ring winding in series, the outer ring provides wide-area magnetic field coverage, the inner ring strengthens the local magnetic field intensity, and the ferrite array is combined to suppress magnetic leakage to cope with horizontal and rotary offset; the receiving end adopts a curved surface type structure and fits the geometric contour of an aircraft shell, interference of a rotation offset delta phi on a magnetic field is limited through optimal design of a coverage angle theta, and magnetic flux is concentrated by a ferrite array on the back side to improve the coupling efficiency. The system does not need complex mechanical adjustment, realizes energy transmission through magnetic field coupling, keeps stable efficiency in seawater, fresh water and air environments, has the advantages of compact structure, high offset resistance, wide medium adaptability and high expandability, and remarkably improves the reliability and cruising ability of wireless charging of the underwater vehicle.

According to the implantable magnetic suspension blood pump structure, an impeller is suspended in a containing cavity of a pump shell and can rotate around the central axis of the pump shell, and blood is sucked in from an inlet and discharged from an outlet; the motor comprises a motor stator assembly arranged in the pump shell and a rotor magnet array arranged on the impeller. The magnetic suspension device comprises an electromagnet arranged in the pump shell and a suspension magnet assembly arranged on the impeller, and electromagnetic suspension force provided by the electromagnet and passive permanent magnet bias suspension force provided by the suspension magnet assembly jointly maintain suspension balance of the impeller. The motor and the magnetic suspension device are independently controlled, so that the negative influence of low signal detection accuracy caused by magnetic field coupling is effectively reduced; the hybrid magnetic suspension structure reduces power consumption of the magnetic suspension device; the arrangement positions of the motor stator assembly and the electromagnet enable the blood pump to be compact in structure and reduce the size and weight; the gap and the position of the electromagnet and the suspension magnet assembly are accurately controlled, accurate control over the suspension position of the permanent magnet is achieved, and the pumping efficiency and stability of the blood pump are improved.

The magnetic suspension blood pump is high in integration level, small in magnetic field coupling degree and high in regulation and control precision and comprises a pump shell, an impeller, a motor unit and a magnetic suspension unit, and the axial suspension state of the impeller is jointly maintained through the magnetic acting force between an electromagnet assembly and a suspension magnet assembly and the magnetic acting force between a motor stator assembly and a motor rotor magnet; the repulsive force of the static magnetic ring array and the movable magnetic ring array maintains the radial suspension state of the impeller. The magnetic suspension unit and the motor unit are arranged at the upper end and the lower end of the impeller respectively, the distance between the magnetic suspension unit and the motor unit is increased in space, the magnetic coupling effect between the magnetic suspension unit and the motor unit is greatly reduced, control difficulty is remarkably reduced through independent control of the magnetic suspension unit and the motor unit, and system stability is improved. The special structural design improves the space utilization rate, reduces the size of the pump body, disperses a heat source and reduces the heat dissipation pressure; the bias magnetic field provided by the suspension magnet provides open-loop magnetic force in the axial direction, the closed-loop control force needing to be provided by the electromagnet assembly is greatly reduced, and the purposes of saving energy and reducing consumption are achieved.

The invention discloses a load capacity evaluation method for a new energy delivery transformer, particularly relates to the technical field of safe operation of power equipment, and is used for solving the problem that a safe load boundary is not accurate due to the fact that an existing evaluation method neglects an accumulated degradation effect of frequent actions of an on-load tap-changer on heat dissipation performance. The method comprises the following steps: constructing an interval time sequence by recording an action timestamp of an on-load tap-changer in real time, generating a permutation entropy value based on phase-space reconstruction, and triggering heat dissipation degradation evaluation; winding distributed optical fiber temperature and leakage magnetic field three-dimensional data are synchronously obtained, and a temperature-magnetic field coupling network is constructed to extract structural characteristic parameters to generate a heat dissipation degradation evaluation value; converting the evaluation value into a heat dissipation coefficient correction factor, dynamically correcting transformer thermal circuit model parameters in combination with real-time load current, and generating a safety load boundary in an adaptive degradation state; and finally outputting a load capacity evaluation result containing the corrected boundary. And dynamic correlation evaluation of the heat dissipation performance degradation and the safety load capacity of the transformer is realized.

The invention relates to the technical field of particle size analysis, solves the technical problem of signal distortion in rodlike abrasive dust particle size monitoring in a high-intensity magnetic field environment, and particularly relates to an inverse Fourier transform particle cross detection method and system for a laser particle analyzer, and the method comprises the following steps: collecting an original scattered light intensity signal and magnetic field intensity data; calculating a magnetic field change gradient based on the magnetic field intensity data; calculating a predicted phase offset used for eliminating signal distortion caused by rotating speed abrupt change by using the magnetic field change gradient; and identifying an oscillation risk period based on the magnetic field change gradient and a preset risk determination threshold. The method breaks through the hypothesis of a traditional Mie theory on spherical particles, establishes a scattering kernel function of the rod-shaped particles based on a T matrix theory, introduces a magnetic field coupling term, and quantifies the influence of a magnetic field on particle orientation and scattering signals. The situation that single particles are misjudged as multi-size mixed particles due to scattering double-peak artifacts caused by directional arrangement of the rod-shaped particles in a high-intensity magnetic field is avoided, and the particle size inversion precision is remarkably improved.

The invention relates to the technical field of air purification, and discloses a negative oxygen ion generator and a method thereof.The negative oxygen ion generator comprises an external shell used for providing installation positions for related parts; the power supply input module is mounted in the external shell, is internally provided with a filtering unit, and is used for receiving external direct current; the direct current and alternating current inversion module is electrically connected with the output end of the power supply input module, is internally provided with a switch assembly and is used for converting the direct current into high-frequency alternating current; a primary winding, a secondary winding and a feedback winding are arranged in the boosting transformer. A boosting transformer is arranged between a direct current and alternating current inversion module and a high-voltage double-voltage rectification module, so that the voltage is effectively boosted, more importantly, the magnetic field coupling characteristics of a primary winding and a secondary winding are utilized, reliable electrical isolation is constructed, and a physical path from a high-voltage side circuit to a low-voltage side circuit is blocked.

The invention relates to a physical field coupling simulation analysis method and device of a circuit breaker, computer equipment, a computer readable storage medium and a computer program product. The method comprises the following steps: acquiring distributed conductivity in an arc extinguish chamber of the circuit breaker; according to the distributed conductivity and an electric field finite element equation, an electric field distribution value in the circuit breaker arc extinguish chamber is obtained through calculation; calculating a current density distribution value in the arc extinguish chamber of the circuit breaker based on the electric field distribution value; substituting the current density distribution value into an axisymmetric magnetic field equation, and performing electric field and magnetic field coupling; substituting the port boundary voltage and the port current of the arcing area of the circuit breaker into the circuit matrix equation, and carrying out electric field and circuit bidirectional coupling; the electric field finite element equation, the axial symmetry magnetic field equation and the circuit matrix equation are combined, and the potential distribution value and the magnetic field distribution value of the arcing area of the circuit breaker and the port boundary voltage and the port current of the equivalent resistor are obtained through solving. By adopting the method, the simulation analysis efficiency and precision of the circuit breaker arc extinguish chamber can be improved.

The invention belongs to the technical field of integrated die casting, and relates to an integrated die casting forming method and system based on multi-magnetic-field coupling. The method comprises the steps that S1, metal raw materials are subjected to smelting, degassing modification and deslagging standing, and a metal melt is obtained; s2, in the inert gas environment, electromagnetic stirring is conducted on the metal melt; s3, the mold is subjected to mold heating, heat preservation and pressure maintaining, vacuumizing and release agent spraying; s4, the metal melt is pressed into a mold cavity for mold filling and solidification, a coupling magnetic field is applied to the metal melt, and an integrated die casting is obtained; wherein the coupling magnetic field covers a mold cavity and is used for improving the flowability of a metal melt during mold filling, inhibiting turbulent flow and refining the structure of the metal melt after solidification; the coupling magnetic field comprises a direct-current magnetic field and a pulsed magnetic field, the direct-current magnetic field penetrates through the metal melt from bottom to top, and the pulsed magnetic field penetrates through the metal melt from the side of the mold cavity. By means of the method, the high-quality integrated die casting can be manufactured.

The invention relates to the technical field of magnetic material injection molding, and discloses an injection molding magnetic powder orientation optimization method and system based on rheology-magnetic field coupling. The method comprises the following steps: deploying a distributed sensing network at key positions of a mold runner and a mold cavity, and synchronously capturing dynamic viscosity change gradient and magnetic field intensity space distribution of a melt in real time in a filling process. The captured data are input into a multi-physics field coupling simulation engine based on micromechanics, an instantaneous orientation vector field of the magnetic powder in the cavity is obtained through calculation, then an orientation order degree topological graph is constructed through tensor analysis and an image algorithm, and a weak orientation area and the boundary of the weak orientation area are accurately recognized. And finally generating a composite regulation and control instruction of the magnetic field and the injection parameters according to an identification result. According to the method, online diagnosis and active compensation regulation and control of the orientation state of the magnetic powder can be realized, and the orientation uniformity and consistency of the injection molding magnet are improved.

The invention relates to the technical field of medical instruments, in particular to an electromagnetic needleless injector which comprises a shell, a nozzle assembly, a liquid storage assembly, a driving assembly and an intelligent control system. Firstly, a series excitation linear motor is adopted to replace a traditional needleless injector driven by a spring, and the problems that driving force is limited and elasticity is attenuated due to the spring are effectively solved. According to the series excitation linear motor, through excitation magnetic field coupling between the stator coil and the rotor coil in the motor, the rotor directly drives the plunger rod to do linear motion in the axial direction so as to complete injection, the structure is simpler, the direct drive type connection structure is adopted, the stability is higher, and force transmission is more accurate. In addition, an intelligent control system integrated in the needleless injector enables the needleless injector to be more intelligent, control precision is higher, operation is more convenient, the needleless injector can be wirelessly connected with a breeding cloud management system, rapid, accurate and painless injection of live pigs and other animals can be achieved, and breeding efficiency and injection safety are improved.

A three-phase wireless electric energy transmission device disclosed by the present invention comprises a three-phase inverter, a three-phase switch capacitor, a coil magnetic field coupling structure and a rectifier, the coil magnetic field coupling structure comprises a primary coil and a secondary coil which are arranged in mirror symmetry, the primary coil is provided with two layers, each layer comprises a three-phase coil, each phase coil occupies a 120-degree angle range of the circumference, and the rectifier is connected with the primary coil and the secondary coil. The two layers of coils form a staggered angle, each phase of switched capacitor of the three-phase switched capacitor comprises a first capacitor branch and a second capacitor branch which are arranged in parallel, the first capacitor branch is provided with a first capacitor, and the second capacitor branch comprises a second capacitor and a switch module which are arranged in series; the switch module adjusts the equivalent capacitance value of the second capacitor branch through the duty ratio and adjusts the transmission power of the three-phase wireless power transmission device. The invention further discloses a load power adjusting method of the three-phase wireless power transmission device, the transmission efficiency can be kept unchanged within the adjusting range, and soft switching can be achieved within the adjusting range.

The present invention relates to the field of magnetic material preparation and heat treatment technology, specifically a method for widening the heat treatment process window of a high magnetic permeability nanocrystalline strip. By gradient composition design and pulsed magnetic field coupling heat treatment, the initial magnetic permeability of the strip exceeds 220,000 and the heat treatment temperature range is widened to 400°C-600°C; the alloy composition is Fe73.5%, Cu1%, Nb3%, Si13.5%, B8.5%, Co0.5%, and during heat treatment, the temperature is first raised to 450°C at 15°C / min and a 0.8T pulsed magnetic field is applied to keep the temperature, and then the temperature is raised to 550°C for keeping the temperature, crystallizing to generate α-Fe(Si) nanocrystals and Co-B amorphous interface phase, with Co distributed in the form of solid solution. This method widens the heat treatment temperature range, improves the initial magnetic permeability of the strip, improves toughness to meet automated production, and reduces costs using existing equipment; the prepared strip has high magnetic permeability and good stability, is suitable for a variety of scenarios, and has good economic and social benefits.

The invention relates to the technical field of rare noble metal extraction, and discloses a multi-magnetic-field coupling rapid separation and extraction system and device for rare noble metals, and the system comprises a magnetic field activation module which is used for starting a liquid level controller to detect the liquid level height in a silicon carbide container; the distribution and intensity of a magnetic field in the molten metal are monitored in real time, and the induction intensity and frequency are dynamically adjusted; the metal droplet extraction simulation module is used for acquiring real-time data, constructing a metal droplet extraction model, and inputting the real-time data into the metal droplet extraction model for simulation to obtain optimal adjustment parameters; the optimal adjustment parameter module is used for adjusting coil current, magnetic induction intensity and frequency data parameters based on the optimal adjustment parameters; and analyzing the volume ratio of the precious metal liquid drops in the metal liquid, and if the volume ratio does not reach the standard, readjusting the metal liquid drop extraction model. Closed-loop control is formed, efficient and accurate separation of rare and precious metal liquid drops is achieved, and the automation level and stability of the whole extraction process are improved.

Techniques for a wirelessly powered remote switch are disclosed. A power-receive unit receives wireless power when coupled to a power-transmit unit via a magnetic field. The power-receive unit includes one or more input mechanisms that, when actuated, close a switch to enable electric current to flow through an electrical component and a timer. Closing the switch causes an impedance shift at a coil of the power-receive unit based on an impedance of the electrical component according to a frequency defined by the timer. The frequency is detectable by the power-transmit unit to trigger a function.

The invention relates to the technical field of permanent magnet motors, in particular to a double-rotor hybrid excitation magnetic flux switching permanent magnet motor with double-C staggered teeth and magnetic flux leakage control, which comprises an outer rotor, a middle stator and an inner rotor, the middle stator is arranged between the outer rotor and the inner rotor, a plurality of first salient poles are uniformly distributed on the outer rotor, and a plurality of second salient poles are uniformly distributed on the inner rotor. A plurality of second salient poles are uniformly distributed on the inner rotor; the middle stator comprises m double-C staggered tooth type iron cores, m rectangular leakage magnetic iron cores, n tangentially magnetized I-type permanent magnets, an armature winding, a first set of excitation windings and a second set of excitation windings. The advantages of compact structure and high working efficiency of a double-rotor magnetic flux switching permanent magnet motor are reserved, an air-gap magnetic field is smooth and adjustable by adding the electro-magnetic winding, the problem of magnetic field coupling when the inner motor and the outer motor work simultaneously is effectively solved, the speed regulation range when the inner motor and the outer motor work independently is widened to a certain extent, and the service life of the motor is prolonged. Meanwhile, the leakage magnetic iron core is added, so that the problems of strong permanent magnetic potential and difficulty in flux weakening are solved.

The invention discloses an anti-offset wireless charging system magnetic coupling mechanism and an optimization design method. A transmitting end of the magnetic coupling mechanism adopts a coil of a bipolar reverse high anti-offset structure, and a receiving end adopts a circular plane spiral coil to reduce the weight of a vehicle-mounted end energy pickup mechanism; the transmitting end bipolar reverse high-anti-offset structure is formed by winding uninterrupted litz wires, an outer ring coil and an inner ring coil are located on the same plane and concentric, and the manufacturing directions are opposite, so that the bipolar reverse characteristic is formed. The transmitting end bipolar reverse high anti-offset structure coil also adopts an anti-offset particle swarm optimization design method considering receiving end plane movement mutual inductance smoothness and coil wire length, and under the condition of considering the transmitting end coil wire length, the magnetic field coupling uniformity in the 360-degree plane movement process of the receiving end is improved. The magnetic coupling mechanism provided by the invention has good anti-offset performance, and still has stable magnetic field coupling characteristics in a large-range moving process of a receiving end.

The invention discloses equipment and a method for laser auxiliary heating, magnetic control arc combination and static magnetic field coupling, and relates to the technical field of refractory and high-melting-point metal and metal-based composite materials. The problems of difficulty in melting and non-uniform components in the prior art are solved. The equipment comprises a vacuum melting furnace, a split water-cooled crucible, a laser auxiliary heating device, an electric arc generating device, a magnetic control device, a static magnetic field generating device and a central control cabinet. The method comprises the steps of charging and vacuumizing, laser preheating, starting arc and double-magnetic-field coupling smelting, and coordinately regulating and controlling multiple parameters through a control cabinet so as to realize accurate control on flowing and solidification structures of a molten pool. Through multi-energy field time sequence coupling and space cooperation of laser, magnetic control electric arc and static magnetic field, active intervention on the molten pool dynamics and solidification process is achieved, component homogenization is promoted, the solidification structure is refined, and the method is used for preparing high-temperature alloy and refractory and active metal material cast ingots with uniform components and excellent structure performance.

The invention relates to the technical field of electronic wire harnesses, and particularly provides a processing method of an anti-interference electronic wire harness, which comprises the following steps: generating an impedance distribution curve through time domain waveform analysis, enabling the precision of the impedance distribution curve to reach ohm level, identifying a reflection peak value of a discontinuous point and a waveform baseline noise level, and determining a specific position of impedance abrupt change; according to a discontinuous point reflection peak value in the impedance distribution curve, the connector size and the via hole pitch in the confluence structure are adjusted, the path length is optimized according to the signal propagation delay time, and the reflection signal attenuation rate is reduced; constructing a confluence structure virtual model by using three-dimensional modeling software, importing the adjusted connector size and via hole pitch, setting the geometric parameter grid density as thousand points per millimeter, and generating a digital twin body; and calculating an input signal amplitude range and a vibration mode frequency range of the optimized confluence structure by adopting a frequency domain analysis method, and verifying whether the electromagnetic field coupling strength meets a matching requirement or not.

The invention provides a target material rotation and magnetic field coupling arc ion plating device which is matched with magnetic fluid multistage sealing and a double-circulation water cooling system through the design of high-speed rotation of a target material and dynamic coupling of a magnetic field of a static permanent magnet. The core problems of large particle pollution, low target material utilization rate, poor high-temperature working condition stability and the like in a traditional arc ion plating process are systematically solved. By combining internal and external independent water cooling channels, the surface temperature of the target material is stabilized below the working range, and the transmission system temperature rise is small; the modularized magnet and gear transmission design further reduces energy consumption and maintenance cost, and the film thickness uniformity is improved through rotating speed-magnetic field-cooling intelligent regulation and control. And a high-reliability industrial solution is provided for high-performance coating.

This invention provides an axial-radial composite flux permanent magnet motor, relating to the field of motor technology. It includes a rotor assembly and a stator assembly. The rotor assembly includes multiple permanent magnets uniformly arranged circumferentially. Each permanent magnet includes an integrally formed axial pole segment, a first transition segment, and a radial pole segment. The stator assembly includes a stator core and stator windings. The stator core includes stator teeth uniformly arranged circumferentially. Each stator tooth includes an integrally formed axial tooth body segment, a second transition segment, and a radial tooth body segment, corresponding to the axial pole segment, the first transition segment, and the radial pole segment, respectively. The stator windings are wound on the corresponding axial tooth body segments. This invention not only reduces magnetic energy loss and improves magnetic field coupling efficiency but also increases the effective coupling area between the permanent magnets and the stator teeth, improving the motor's torque density and power density. Furthermore, it ensures stable operation and has a wide range of applications.

The invention discloses a flat wire type high-power E-type non-contact power supply electricity taking device which comprises an E-type magnetic core and a coil assembly wound on the E-type magnetic core, the coil assembly is formed by winding a flat wire in a multi-layer lap winding mode, no framework structure exists in the coil assembly, the wire in the coil assembly is the flat wire, and the E-type magnetic core is arranged on the E-type magnetic core. The flat wire is a flat copper bar, and the cross section of the flat wire is rectangular. The flat wire type high-power E-type non-contact power supply electricity taking device is formed by winding flat wires in a multi-layer lap winding mode, every two adjacent layers of flat wires are arranged in a staggered mode, the interlayer gap is controlled to be within 0.1 mm, and the groove fullness rate reaches 92% or above. The design not only improves the effective sectional area of the conductor, but also significantly reduces the eddy current loss, thereby improving the magnetic field coupling efficiency.

The application relates to a double-side coupling axial nutational magnetic speed reducer and a working method thereof. The speed reducer comprises a box, an input shaft is arranged at the left end of the box, a rotating disc is arranged at the right side in the box, a nutational disc is arranged in the box and rotates with the input shaft, first and second nutational magnetic gears are arranged at the left and right end faces of the nutational disc respectively, a fixed magnetic gear is arranged at the left end of the box and is magnetically coupled with the first nutational magnetic gear, and a movable magnetic gear is arranged at the left end face of the rotating disc and is magnetically coupled with the second nutational magnetic gear. The double-side coupling axial nutational magnetic speed reducer can realize few-pole difference, has simple structure, large transmission ratio and high transmission efficiency, the axial forces generated by the axial magnetic gears on the two sides can be effectively offset, the service life of bearings is prolonged, the axial force is small, and transmission is stable.

The invention discloses a magnetic coupling surge protection device based on an amorphous ferrite material, which comprises an amorphous ferrite magnetic core, a secondary side inductor, a secondary side resistor, a bias conductor and a bias power supply, is nested outside a high-voltage direct-current transmission line, and forms magnetic field coupling with the high-voltage direct-current transmission line through the amorphous ferrite magnetic core in the device. When suddenly changed surge current flows through the device, a rapidly changing magnetic field is excited in the amorphous ferrite material, the magnetic field provides equivalent inductance for the high-voltage direct-current transmission line, and meanwhile, the rapidly changing magnetic field generates induced electromotive force in the bias conductor and generates induced current; the induced current generates heat loss in the process of flowing through the secondary side resistor, and surge current energy in the high-voltage direct-current transmission line is converted into the heat loss of the secondary side resistor through the process, so that surge protection is realized. The invention has the advantages of high saturation magnetic flux density, high relative permeability, excellent high-frequency performance and the like, and is suitable for the operation condition of magnetic coupling surge protection equipment.

This invention discloses a magnetically levitated grain vibrating screen, belonging to the field of grain impurity removal technology. It includes a base with a magnetic coupling module; a screen body mounted above the base, with a permanent magnet array corresponding to the magnetic coupling module at its bottom; the magnetic coupling module includes a drive assembly mounted on the base, comprising multiple independent drive coils, each connected to an independently adjustable AC power supply; the AC power supply generates a changing driving magnetic field by inputting AC current of a preset frequency and phase to the corresponding drive coil, and the driving magnetic field couples with the permanent magnet array, driving the screen body to perform multi-degree-of-freedom force-driven motion. The screen body of this invention can perform multi-degree-of-freedom force-driven motion, realizing reciprocating swing motion, and improving the screening efficiency for fine impurities in grain.

A wireless rechargeable solid-state battery module includes a solid-state battery; an internal structure including an internal circuit electrically connected with the battery; positive and negative electrode terminals, each of which is electrically connected with the solid-state battery, is exposed on an outer surface, and is where the positive or negative electrode terminal can be mounted on an electronic circuit board; barrier layers that entirely or partially contain a conductor and isolate the battery and the internal structure from an outside air environment; and a power receiving terminal electrically connected with an external circuit, which includes a power receiving coil coupled with an external electromagnetic or magnetic field, is electrically connected with the internal circuit, and is in an outside of the barrier layers. The power receiving coil converts the external electromagnetic or magnetic field into electrical energy and supplies current to the internal circuit via the power receiving terminal.

The invention relates to the technical field of motors, in particular to an excitation type series excitation linear motor and a control method, the excitation type series excitation linear motor comprises a shell, a stator coil and a rotor coil, the stator coil and the rotor coil are arranged in the shell, one end of the shell is axially and slidably connected with a driving shaft, and a control module used for adjusting the magnitude and direction of thrust is arranged outside the shell. One end of the driving shaft penetrates into the shell and is connected with the rotor coil, and the other end penetrates out of the shell. The stator coil is sleeved outside the rotor coil, an air gap exists between the stator coil and the rotor coil, the stator coil and the rotor coil are connected in a series excitation mode, and the driving shaft is enabled to perform linear motion through excitation magnetic field coupling between the stator coil and the rotor coil. Compared with an existing linear motor, the linear motor does not depend on a permanent magnet to form a magnetic field any more, the manufacturing cost of the motor is effectively reduced, the problems of assembly and failure related to the permanent magnet are solved, and the linear motor has high thrust density and wider application range and can be particularly applied to the fields of needleless injection, electromagnetic riveting and the like with high thrust strength requirements.

The utility model relates to the technical field of building blocks teaching aid, especially to a circuit module and circuit toy set, including base, the side of base is provided with the interface for inserting the power cord, the bottom of base is provided with the standardization intermate structure for inserting on building block board, and the standardization intermate structure is connecting post or connecting groove, the inside rotation of base is provided with magnetic attraction component and the driving device of driving magnetic attraction component rotation, at least partly transparent liquid storage cylinder body, detachably installed on the base, the bottom of liquid storage cylinder body is equipped with magnetic rotation component, wherein, when liquid storage cylinder body installs to base, magnetic rotation component is located in the magnetic field action range of magnetic attraction component, when driving device drives magnetic attraction component rotation, through magnetic field coupling drives magnetic rotation component synchronous rotation, makes the liquid in liquid storage cylinder body form whirlpool, this scheme has the advantages of non -contact transmission to avoid mechanical wear and tear, high modular degree and convenient maintenance.

An aerosol-generating device (100) and a state detection method for a substrate tape (123). The aerosol-generating device (100) consists of a main unit housing (111), a medium cartridge (120), a driving assembly (11), a heating assembly and a control circuit (12), wherein a first reel (124), a second reel (125) and a substrate tape (123) which is connected to and wound around the two reels are provided inside the medium cartridge (120); and the substrate tape (123) is provided with first magnetic induction segments (21) and second magnetic induction segments (22), which are alternately spaced. When the first reel (124) and the second reel (125) are driven to rotate, a magnetic induction coil assembly (13) of the heating assembly generates a magnetic field that couples with magnetic fields generated by the first magnetic induction segments (21) and the second magnetic induction segments (22), and generates electrical signals of different magnitudes; and the control circuit (12) samples the electrical signals, determines the motion state of the substrate tape (123) on the basis of the electrical signals, and determines whether the problem of tape breakage or tape jamming occurs; thus, corresponding drive control can be performed on the driving assembly (11) and / or corresponding alarm prompt information can be sent out, thereby realizing state detection of the substrate tape (123), and improving the safety of the aerosol-generating device (100).

The present invention relates to a filter for a communication device, and in particular, can simplify the complexity of the filter and achieve the performance of various filters due to comprising a notch forming unit that restricts a filtering frequency area by forming prescribed notches at the left end and right end of a passband, wherein the notches are disposed closer than the separation distance between adjacent resonance elements at a portion in which magnetic field coupling between the resonance elements is dominant or a portion in which electrical field coupling between the resonance elements is dominant among at least three adjacent resonance elements sequentially selected along the longitudinal direction of a cavity for multipath coupling.