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137 results about "Magnetic pressure" patented technology
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Magnetic pressure is an energy density associated with a magnetic field. Any magnetic field has an associated magnetic pressure contained by the boundary conditions on the field. It is identical to any other physical pressure except that it is carried by the magnetic field rather than (in the case of a gas) by the kinetic energy of gas molecules. A gradient in field strength causes a force due to the magnetic pressure gradient called the magnetic pressure force.
Device for compressing a compact toroidal plasma for use as a neutron source and fusion reactor
InactiveUS20110142185A1Improve isolationHigh densityNuclear energy generationAcceleratorsCombustion chamberPlasma density
Provided are methods and devices for compression of a spheromak plasma (e.g., deuterium-trirtium (D-T)-derived) in a magnetic well configured within a plasma combustion chamber using an induction coil axially adjacent to the plasma, wherein a moveable member (e.g., piston, cam and follower) drives the induction coil toward the plasma, pushing the plasma via magnetic pressure into the magnetic well and compressing the plasma substantially adiabatically (e.g., coil motion is well below the plasma sound speed). The compression quickly increases both plasma density and temperature past the point of ignition, and after plasma burn, the coil is backed-off to allow the plasma to re-expand, providing for refueling and repetition of the compression cycle. Additionally provided are spaced annular plasma formation electrodes, suitably configured for generating and injecting magnetized plasma into a plasma combustion chamber. Preferably, spaced annular plasma formation electrodes are used in combination with moveable compression members as disclosed herein.
Owner:WOODRUFF SCI
Liquid metal droplet generator
Small, high velocity liquid metal droplets are produced for applications that require the accurate and remote placement of small quantities of a metal. The magnetic pressure of current flowing through liquid metal is used to force small quantities of liquid metal through an orifice. Examples of applications are to feed metal fuel into plasma extreme ultraviolet sources, and to place solder bumps on an integrated circuit prior to the attachment of connections.
Owner:PUREX
Method for increasing the circular degree of the metal thin-walled cylinder using pulse magnetic pressure
The invention discloses a method for improving roundness of a metal thin-wall cylindrical workpiece by pulsed magnetic pressure, and relates to a method for improving roundness of a metal thin-wall cylindrical workpiece. The method solves the problems that the existing cylindrical workpiece shape correction method has the disadvantages of complex mechanism and die, uneasy operation and low accuracy of shape correction, and the existing cylindrical workpieces have the disadvantages of easy wearing surface, residual stress, short service life, difficult sealing, high cost and difficult operation, both of which are not favorable for the small-batch and diversified development trend. The method comprises the following steps: step one: the metal thin-wall cylindrical workpiece is arranged in a high-accuracy shape correction die, and magnetic impulse processed coils are placed in the cylindrical workpiece; step two: a high-frequency pulse capacitor bank is used for discharging the magnetic pulse processing coils, high-frequency pulse acts on the cylindrical workpiece to cause the cylindrical workpiece to generate high-speed deformation and generate impact contact and adhere to the die. The invention has the advantages of simple mechanism and die, high machining accuracy, long service life and low cost, and is favorable for the small-batch and diversified development trend, etc.
Owner:HARBIN INST OF TECH
Method and device for emitting radial seismic waves in a material medium by electromagnetic induction
A method and device for emitting radial seismic waves in a material medium by electromagnetic induction, used notably for generating seismic waves in cased or uncased wells or in a water mass is disclosed. Emission of radial waves is essentially obtained by radially expanding a metal tube (1) under the effect of a magnetic pressure generated by electromagnetic induction with elastic waves being created in the medium under the effect of this expansion. The magnetic pressure is obtained by connecting a coil (2) in line with the tube to a current generator (3). The winding pitch of coil (2) can be constant or variable. Tube (1) can for example be added into a well or hole or it can be a tube portion of a cased well.
Owner:INST FR DU PETROLE
Flue gas powder dust and characteristic gas simultaneous on-line monitoring method and apparatus
InactiveCN101303301AHighlight substantive featuresSignificant progressPhase-affecting property measurementsMaterial analysis by electric/magnetic meansFlue gasData acquisition
The present invention provides an online monitoring method and a device for monitoring dust and characteristic gas in flue gas, wherein, the device mainly comprises a casing, a blower, a U-shaped flue gas by-pass pipe, an emitting / receiving unit, a reflection unit, a probe, a data collector, and a data analysis system. After the blower is started, the laser beam emitted from the emitting / receiving unit penetrates through the flue gas and is reflected by the reflecting unit, the reflected beam is received by the receiving unit, and transmitted through a lead wire to the data acquisition controller, the multi-functional probe measures characteristic gas, and transmits the data through a lead wire to the data acquisition controller, the collected data of dust and characteristic gas in the flue gas is transmitted through a lead wire to the flue gas analysis system, the concentration values of NOx, NO, SO2, CO and CO2 are measured with an alternating flow non-dispersed infrared technique, and the concentration values of O2 and H2 are measured with a magnetic pressure technique; the instantaneous concentration values and dynamic mean values between any two time points within 14h of the seven characteristic gas are outputted.
Owner:NORTHEAST DIANLI UNIVERSITY
Method and device for realizing stable plasma confinement by pressure of AC magnetic field which can be used for controlled nuclear fusion
The invention relates to method and devices for producing stable hot plasma. In particular, the invention can be applied for realizing stable plasma in a thermonuclear reactor to provide energy source for power generation. In the method plasma is confined by pressure of AC magnetic field concentrated in a layer between plasma surface and surrounding conducting shell in which stabilizing feedback on the confined plasma is created by achieving conservation of the AC magnetic flux amplitude. The device for realization of the proposed method comprises a toroidal conducting shell filled with plasma, with AC voltages applied to insulated cuts in the shell made in poloidal and toroidal directions such that said AC magnetic field is created by AC currents in the shell and image currents on the plasma surface. The amplitudes and relative phases of said voltages are rather arbitrary, in particular they can be selected such that the resultant magnetic vector rotates in the plane tangential to the plasma surface with nearly circular polarization exerting nearly time independent magnetic pressure on the plasma.
Owner:SVIDZINSKI VLADIMIR ALEKSANDROVICH
Device and method of measuring yield strength and strain hardening exponent of metal material by indentation method
PendingCN107860671AAchieve losslessAchieving minimal loss measurementsInvestigating material hardnessPropellerMetallic materials
The invention discloses a device of measuring yield strength and a strain hardening exponent of a metal material by an indentation method. The device comprises a servo motor, a pressure propeller anda transverse plate that are sequentially connected from the top down, wherein the pressure propeller is internally provided with a pressure rod; the pressure rod is driven by the servo motor and penetrates through the transverse plate and a pressure sensor; a pressure rod bottom plate is arranged at the lower end of the pressure rod; the lower part of the pressure rod bottom plate is sequentiallyconnected with a pressure head base, a pressure head connecting rod and a pressure head; four corners of the transverse plate are connected with a magnetic pressure platform via side plates; the servomotor and the pressure sensor are connected with a computer; and the yield strength and the strain hardening exponent are calculated by a load-displacement curve. According to the device, the computer controls the motor to allow output displacement of the motor to be capable of accurately tracking and reproducing input displacement; nondestructive and micro-destructive measurement of a measured object to be detected are achieved; and mechanical properties of the metal material are characterized by the micro-load continuous indentation method by taking a load and depth in an indentation process as response values.
Owner:NANJING UNIV OF TECH +1
Detector for magnetic hazards to implanted medical device
InactiveUS7639006B2ElectrotherapyMagnetic field measurement using flux-gate principleHand heldImplanted device
Owner:DEFFEYES KENNETH S
Composite magnetism gathering type permanent magnet guide rail mechanism applicable to high-speed superconductivity magnetic suspension system
ActiveCN103144547AClear directionImprove high-speed operation performanceElectric propulsionMagnetic field gradientHigh-temperature superconductivity
The invention discloses a composite magnetism gathering type permanent magnet guide rail mechanism applicable to a high-speed superconductivity magnetic suspension system. The composite magnetism gathering type permanent magnet guide rail mechanism comprises a main magnetism gathering pole formed by a plurality of ferromagnetic materials, a permanent magnet contraposition combination formed by a plurality of permanent magnets, and a permanent magnet guide combination formed by a plurality of permanent magnets. The composite magnetism gathering type permanent magnet guide rail mechanism is characterized in that the main magnetism gathering pole can gather the main magnetic circuit or the main magnetic energy of the permanent magnet guide rail and diffuses towards the space, and the high magnetic conductivity is favorable for inhibiting longitudinal magnetic field gradient; the permanent magnet contraposition combination generates strong magnetic pressure by utilizing the mutual repulsion effect between the magnetic poles of each permanent magnet; and the permanent magnet guide combination has the effects of auxiliarily gathering magnetism and guiding the magnetic circuit, and guides and diffuses the magnetic energy of the permanent magnets to the upper surface of the guide rail and the above region by utilizing the magnetization directionality of the permanent magnets. The composite magnetism gathering type permanent magnet guide rail mechanism obviously improves the utilization ratio of the permanent magnet guide rail magnetic field on the basis of guaranteeing the requirement of the magnetic suspension system on the magnetic field intensity, effectively stabilizes the longitudinal magnetic field gradient caused by the errors or defects of the permanent magnets, and guarantees the safety and the stability of the high-temperature superconductivity magnetic suspension system during operation at high speed and ultrahigh speed.
Owner:BEIJING AEROSPACE CENTURY SUPERCONDUCTING TECH
Method for analyzing and calculating magnetic leakage coefficient of built-in permanent magnet synchronous motor
InactiveCN107153746AAccurate calculationImprove accuracyDesign optimisation/simulationSpecial data processing applicationsMagnetization curvePermanent magnet synchronous motor
The invention discloses a method for analyzing and calculating magnetic leakage coefficient of a built-in permanent magnet synchronous motor. The method comprises the following steps: supposing a value of the magnetic leakage coefficient, determining main magnetic flux of each electrode, and calculating the magnetic pressure drop of a main magnetic path based on the magnetic pressure drop of the main magnetic path, wherein the magnetic pressure drop is magnetic pressure drop added on the magnetic leakage path and a magnetic bridge part has high magnetic resistance, so the magnetic pressure drop is mainly added on the magnetic bridge part, and the magnetic field intensity of the magnetic bridge part can be determined; searching a magnetization curve according to the obtained magnetic field intensity of the magnetic bridge part to obtain the magnetic flux density of the magnetic bridge part, calculating the magnetic leakage flux, and evaluating the magnetic leakage coefficient according all the magnetic leakage flux; if the difference between the magnetic leakage coefficient and the supposed value exceeds a threshold value, resetting the magnetic leakage coefficient and repeating the above calculation process; if the difference value between the calculated value and the supposed value is within an allowable error threshold value, the calculated value is the obtained magnetic leakage coefficient. By the method, the magnetic leakage coefficient of the built-in permanent magnet motor can be calculated accurately and can be conveniently integrated into electromagnetic calculation adopting a magnetic path analysis method, and the accuracy of electromagnetic calculation is improved.
Owner:SHANDONG UNIV
Magnetic pressure sensing system for an infusion pump
ActiveUS20180207360A1Reduce the impactReduce impactMagnetic measurementsMedical devicesEngineeringInfusion pump
An infusion pump having one or more magnetic pressure sensors for detecting tubing occlusions is provided with at least one corresponding secondary Hall effect sensor arranged to detect an ambient magnetic field influencing pressure measurements so that corrective action may be taken to mitigate the effects of the ambient magnetic field.
Owner:ZEVEX
Frequency modulation for magnetic pressure pulse tool
An apparatus for applying a magnetic pressure to a work piece includes an inductor configured to be disposed in proximity to the work piece and a controller electrically connected to the inductor and configured to control a supply of electrical power in order to output a first voltage over a selected frequency range to determine a frequency that provides a maximum current or a frequency that provides a current within a selected range of the maximum current to the inductor.
Owner:BAKER HUGHES INC
Pressure sensing device for rotatably moving parts and pressure detection method therefor
InactiveUS7446525B2Force measurement by measuring magnetic property varationInflated body pressure measurementPressure senseSource element
Owner:CENT RICERCHE FIAT SCPA
Electro-magnetically enhanced current interrupter
ActiveUS7023307B2Circuit-breaking switches for excess currentsProtective switchesElectrical conductorEngineering
The present invention provides an apparatus and method of interrupting the current in a circuit wherein the magnetic pressure induced by current flow through a conductor causes the conductor to flow and thereby open the associated circuit. Magnetic pressure may be derived from Lorenz equations. Gravity is not relied upon to cause the conductor material to flow. The invention may be used in circuits having high currents relative to conductor size and material selection.
Owner:PRATT & WHITNEY CANADA CORP
Design method for magnetic field configuration of quasi-ring symmetric star simulator
ActiveCN112992385AReduce complexityReduce manufacturing difficultyNuclear energy generationDesign optimisation/simulationEngineeringComputational physics
The invention relates to the technical field of physical experiment equipment, in particular to a quasi-ring symmetric star imitator magnetic field configuration design method. The method comprises the following steps: scanning the radial position of a non-axisymmetric magnetic field component (B<m, n> is a magnetic field intensity spectrum) by utilizing STELLOPT codes, changing the shape of a plasma boundary by adopting an improved Levenberg-Marquardt algorithm, obtaining a plurality of groups of iterated quasi-ring symmetric star simulator magnetic field configuration parameters, and screening out the optimal quasi-ring symmetric star simulator magnetic field configuration from the multiple groups of iterated quasi-ring symmetric star simulator magnetic field configuration parameters. The quasi-ring symmetric star imitator magnetic field configuration designed by the invention can consider the advantages of Tokamak and a traditional star imitator, has the advantages of low new classical transportation, long-time steady-state operation, high beta (the ratio of plasma hot pressure to magnetic pressure) limit and the like, achieves the good plasma confinement performance, and can achieve the long-time steady-state operation. Meanwhile, the blank of domestic star simulator experimental physics research is filled up, and the method has important significance for promoting the construction and development of commercial fusion reactors with steady-state and high-constraint operation in the future.
Owner:SOUTHWEST JIAOTONG UNIV
Magnetic pressure type reading stand
A magnetic pressure type reading stand comprises a magnetic absorption clamping pressing device and a support device, wherein a rectangular top plate of the magnetic attraction clamping pressing device is covered with a bearing plate with an obtuse plate face; the left sides and right sides of the two plates are fixedly connected through side plates, the upper part and lower part of the combination part of the two plates are sealed, the lower part of the combination part of the two plates is sealed by a strip-shaped supporting plate; two pairs of embedding plate magnetic strips arranged at intervals in parallel are embedded or adhered into a back plate of the bearing plate, so as to be mutually magnetically attracted with two external strip-shaped magnets across a book for clamping and pressing pages of the book; 3-5 long or short raised parts are arranged on a base plate of the support device at intervals; a thin iron sheet is paved between a first raised part and a second raised part from the side to the internal part; the support device further comprises support plates movably connected to the transverse middle part of the back plate or support rods pivotally connected to the middle parts of the left side plate and the right side plate; the support plates or the support rods can be mutually fixedly connected or movably connected through support side plates on the base plate, or are not connected, so as to support the magnetic absorption clamping pressing device on the support base plate and adjust multiple reading angles at will. The length and width of the whole structure of the magnetic pressure type reading stand are consistent with those of a book of large sextodecimo.
Owner:汪云
Power cable distribution box capable of realizing cable butt joint
The invention discloses a power cable distribution box capable of realizing cable butt joint. The power cable distribution box has a structure comprising a suction seat, heat dissipating holes, a base, a box body, movable covers, a top plate, a magnetic pressure device, telescopic rods and cable connectors. The suction seat is magnetically connected with and fits the base. Heat dissipating holes in rows and columns are arranged on the side of the base. The box body is welded to the left and right sides of the base. The top of the box body is fixedly connected with the top plate. The side of the box body is in the shape of a trapezoid. The movable covers are connected to the front and rear ends of box body through hinges. The cable connectors are mounted inside the box body. Each movable cover is composed of a cover plate and a cover frame, and the cover plate is welded together with the cover frame. The telescopic rods are hinged together with inner walls on the two sides of the coverframes at one end. According to the invention, the distribution box is fixed by a strong magnet, the magnetic force is strong, the fixing effect is good, the fixing operation is simple and efficient,the removal is facilitated when equipment is aged, and the time and effort are saved.
Owner:SHANDONG SHENGRI ELECTRIC POWER GRP
Electromagnetic control method for directly restricting and controlling liquid level fluctuation of conducting metal fluid
ActiveCN104646643AConstrained control of liquid level fluctuationsWide applicabilityElectricityEngineering
The invention provides an electromagnetic control method for directly restricting and controlling the liquid level fluctuation of conducting metal fluid. According to the method, magnetic pressure is exerted onto the liquid level of the conducting metal fluid, so that the liquid level of the conducting metal fluid generates a downward thrust for controlling the liquid level fluctuation, a group of parallel direct conducting wire coils or disc-shaped conducting wire coils is horizontally arranged on the liquid level of the conducting metal fluid requiring the liquid level fluctuation control, and in addition, harmonic alternating current electricity is introduced into the coils, so that the liquid level of the conducting metal fluid is in a horizontal direction alternating magnetic field, according to the electromagnetic induction effect, the alternating magnetic field generates induction current in the conducting metal fluid, the induction current and the alternating magnetic field realize mutual action, magnetic pressure vertical to the liquid level is formed at the liquid level of the conducting metal fluid, and the magnetic pressure equals to the reinforcement on the gravity field, so that the decoration and the fluctuation of the liquid level of the conducting metal fluid are controlled.
Owner:NORTHEASTERN UNIV
Apparatus and method for measuring the internal pressure of an examination object
ActiveUS20120165649A1Efficient use ofNot serious riskEvaluation of blood vesselsCatheterMagnetic tension forceInternal pressure
The present invention relates to an apparatus (100) for measuring the internal pressure of an examination object, in particular the internal pressure of a blood vessel, by use of a magnetic pressure measurement device (60, 70) introduced into the examination object, which apparatus comprises:—magnetic field generating means comprising magnetic field signal generator units (130) and magnetic field coils (136a, 136b, 136c) for generating a magnetic field for influencing the magnetization of the magnetic pressure measurement device (60, 70), receiving means comprising at least one signal receiving unit (140) and at least one receiving coil (148) for acquiring detection signals, which detection signals depend on the changes in magnetization of the magnetic pressure measurement device (60, 70) caused by the magnetic field and on the changes of the physical properties of the magnetic pressure measurement device caused by the internal pressure of the examination object, and evaluation means (153) for evaluating the detection signals of the magnetic pressure measurement device (60, 70) for determining the internal pressure of the examination object.
Owner:KONINKLIJKE PHILIPS ELECTRONICS NV
Preparation method of nano ferroferric oxide modified water-based acrylate magnetic pressure-sensitive adhesive
InactiveCN106753079AImprove thermal stabilityImprove adhesionNon-macromolecular adhesive additivesEster polymer adhesivesWater basedUltrasonic dispersion
The invention discloses a preparation method of a nano ferroferric oxide modified water-based acrylate magnetic pressure-sensitive adhesive. The preparation method comprises the following steps: (1) weighing nano ferroferric oxide particles and adding into a mixed solution of ethanol and water; carrying out ultrasonic treatment; modifying by a silane coupling agent to obtain the silane coupling agent modified ferroferric oxide particles; (2) after carrying out ultrasonic dispersion on a water solution of the modified ferroferric oxide particles, adding into a NaHCO3 solution; mixing nonylphenyl polyoxyethylene ether sulfate triethanolamine, de-ionized water, butyl acrylate, methyl methacrylate, hydroxyethyl acrylate and acrylic acid to prepare pre-emulsified emulsion; and taking the pre-emulsified emulsion, an initiator and the NaHCO3 solution mixed with ferroferric oxide to react, so as to obtain the nano ferroferric oxide modified water-based acrylate magnetic pressure-sensitive adhesive. According to the method provided by the invention, the nano ferroferric oxide has good compatibility with acrylate emulsion; the obtained pressure-sensitive adhesive has good thermal stability and good cohesive property.
Owner:SHAANXI YIPINDA PETROCHEM CO LTD
Pressure sensing device for rotatably moving parts and pressure detection method therefor
InactiveUS20080258718A1Magnetic measurementsForce measurement by measuring magnetic property varationPressure senseSource element
A magnetic pressure sensing device for rotatably moving parts, of the type including at least one magnetic field source element associated to said rotatably moving part and a magnetic field sensing element associated to a fixed part to measure parameters of a magnetic field determined by said magnetic field source element, said parameters of the magnetic field being a function of the pressure applied to said rotatably moving part. The magnetic field source element includes means for rotating around at least one axis the direction of said magnetic field as a function of the pressure applied to said rotatably moving part.
Owner:CENT RICERCHE FIAT SCPA
High-efficient permanent magnet gathering type guide rail mechanism suitable for high-temperature superconductive maglev system
InactiveCN103129563AClear directionImprove work performanceSliding/levitation railway systemsElectric propulsionDirectivityMagnetic pressure
Owner:BEIJING AEROSPACE CENTURY SUPERCONDUCTING TECH
Active squeezing device for a drip bag
An active squeezing device is used with a drip bag has a drip bag holder and a magnetic pressure assembly. The drip bag holder has a base and a cover mounted pivotally on the base. The magnetic pressure assembly is mounted on the drip bag holder and selectively generates an attractive magnetic force to tightly close the cover on the base to hold and squeeze the drip bag between the base and the cover or generates a repulsive magnetic force to open the cover to release the drip bag. The active squeezing device uses the magnetic force to actively transfuse the liquid medicine or blood in the drip bag to a patient without hanging the drip bag over the patient.
Owner:NAT DEFENSE MEDICAL CENT
Permanent magnet motor modeling and electromagnetic performance calculating method based on magnetic network
ActiveCN110705088AImprove versatilityStrong structural adaptabilityDesign optimisation/simulationMagnetic reluctanceElectric machinery
The invention discloses a permanent magnet motor modeling and electromagnetic performance calculating method based on a magnetic network. The method comprises a modeling method for a stator, a rotor and an air gap of a motor. The method comprises: dividing a solution domain into different parts according to motion conditions; generating a magnetic resistance model in the subdivision unit; adding amagnetic potential model generated by permanent magnet materials and current loading, connecting branches in the parts in series and in parallel, the parts following the magnetic field continuity theorem at a motion interface, achieving continuous smooth distribution of magnetic flux in adjacent branches through a Lagrange interpolation method, and obtaining a node magnetic pressure equation of the whole motor; calculating a corresponding jacobian matrix by adopting a Newton iteration method to obtain a faster model convergence rate; verifying accuracy of a model. The method has the advantages that the universality of the modeling method is guaranteed through part division and unit division, magnetic circuit analysis does not need to be conducted on different structures, the modeling efficiency is the same as that of finite elements, certain solving precision is guaranteed, and the method can serve as a tool for preliminary and rapid analysis of motor performance.
Owner:SOUTHEAST UNIV
Permanent magnet type motor modeling and demagnetization performance analysis method of asymmetric magnetic network
ActiveCN108539934AAnalyzing demagnetization propertiesAccurately analyze demagnetizationGeometric CADManufacturing dynamo-electric machinesTime efficientSimulation
The invention discloses a permanent magnet type motor modeling and demagnetization performance analysis method of an asymmetric magnetic network. The permanent magnet type motor modeling and demagnetization performance analysis method of an asymmetric magnetic network includes the steps: connecting a fixed permeance network model, an air gap permeance network model and a permanent magnet permeancenetwork model in series and in parallel according to corresponding positional relationships so as to be synthesized into a permeance network model of the entire motor; listing a node magnetic potential equation of the permeance network model of the whole motor, obtaining the magnetic flux of the permanent magnet through calculation according to a node magnetic pressure equation, and obtaining themagnetic density of any point of the permanent magnet through calculation; and determining demagnetization by comparing the magnetic density of the permanent magnet B(x) with the magnetic density B(X0) at the knee point X0 of the demagnetization B-H curve of the permanent magnet. Therefore, the permanent magnet type motor modeling and demagnetization performance analysis method of an asymmetric magnetic network can accurately analyze the demagnetization situation of the motor, can save the time, and can improve the design efficiency.
Owner:JIANGSU UNIV
Liner tube type electromagnetic repairing method for old pipe
InactiveCN101251218AImprove structural strengthImprove corrosion resistancePipe elementsRestoration methodEngineering
The invention discloses a liner tube type electromagnetic restoration method used for old pipelines and is characterized in that: an inner liner tube arranged in an original pipeline or an outer liner tube is arranged outside the original pipeline according to the damaged condition of inner and outer walls of the pipe, the outer diameter of the inner liner tube is slightly smaller than the inner diameter of the original pipeline, the inner diameter of the outer liner tube is slightly bigger than the outer diameter of the original pipeline; an electromagnetic coil is arranged inside the inner liner tube or outside the outer liner tube to impose a pulse current to the electromagnetic coil to ensure that the coil space produces a pulse magnetic field, the inner surface of the inner liner tube or the outer surface of the outer liner tube can produce pulse induction currents i' with different directions, thereby producing a pulse induction magnetic field in the space of the liner tube; the pulse magnetic field and the pulse induction magnetic field are interacted between the liner tube and the electromagnetic coil to ensure that the inner surface of the inner liner tube or the outer surface of the outer liner tube has a diameter expanding deformation or diameter shrinking deformation due to the magnetic pressure, and the deformed liner tube is closely combined with the original pipeline.
Owner:XI AN JIAOTONG UNIV
Pre-pressure device of magnetic force pressure enforcement and micro bending ultrasonic electromotor based on this device
InactiveCN101170290AAxial dimension shortReduce radial sizePiezoelectric/electrostriction/magnetostriction machinesMagnetic tension forcePre stress
The invention discloses a pre-pressure device for magnetic pressure and a miniature bending ultrasonic motor using the device, which relates to the field of ultrasonic motors. The invention solves the shortcomings of the existing ultrasonic motors, which are large in radial direction, thick in axial direction and complex pre-pressure device. The pre-pressure device (1) of magnetic force pressurization of the present invention adopts the magnetic steel of circular sheet, and it is fixed on the bottom of stator; Stator metal matrix (3) is the octagonal tube that the center has cylindrical cavity, metal matrix (3) ) adopts a non-magnetic metal material, and a piece of piezoelectric element (4) is fixed on each edge of the metal base (3). The section of the rotor (2) is a "T"-shaped circular platform structure. The side wall of the body is provided with a gear (2-1), the rotor (2) is made of magnetically permeable material, and the lower platform of the rotor (2) is placed in the hollow cylindrical cavity of the stator metal base (3). The ultrasonic motor of the present invention has obvious advantages such as short axial direction, small radial direction, simple pre-pressure device, and convenient installation and fixing, and also has the characteristics of simple processing and low manufacturing cost.
Owner:HARBIN INST OF TECH
Additive manufacturing equipment for magnetic confinement processing of overhanging structural part and method
ActiveCN113000861AAvoid problems such as deformationReduce manufacturing costAdditive manufacturing apparatusSystems analysisControl system
The invention discloses additive manufacturing equipment for magnetic confinement processing of an overhanging structural part and a method. The additive manufacturing equipment comprises a 3D printing device, and an external magnetic field generating device and a molten pool morphology online monitoring device are installed on the two sides of a spray nozzle of the 3D printing device, the output of the molten pool morphology online monitoring device is connected with the input of a central control system, the output of the central control system is connected with the control input of the external magnetic field generating device through a magnetic field control system, the molten pool morphology online monitoring device monitors molten pool morphology characteristics and transmits information to the central control system in real time, the central control system analyzes and compares the morphology with an ideal molten pool morphology, adjusts parameters in real time and transmits an adjustment instruction to the magnetic field control system, the magnetic field control system executes the instruction and changes the magnitude and direction of current in the external magnetic field generating device, and the external magnetic field generating device applies a local magnetic field to constrain the molten pool morphology, provides magnetic pressure to promote interlayer bonding, and meanwhile stirs a molten pool. According to the additive manufacturing equipment for magnetic confinement processing of the overhanging structural part and the method, the additive manufacturing cost is reduced, the interlayer bonding strength is improved, and the forming quality and the forming precision are improved.
Owner:XI AN JIAOTONG UNIV
Combined type magnetic anastomat
InactiveCN103610484ASmooth dischargeShrinkage volumeSurgical staplesMagnetic tension forceFilling materials
The invention provides a combined type magnetic anastomat. The magnetic anastomat comprises two magnetic rings, wherein each magnetic ring comprises an annular shell main body; an inner filling material and a plurality of magnets which are arranged uniformly are arranged in each annular shell main body; the inside of each annular shell main body is filled with the inner filling material except for space with the magnets; each annular shell main body is provided with an annular cover plate of which the shape corresponds to that of the annular shell main body; the annular shell main bodies and the annular cover plates are made of degradable materials; and the inner filling materials are degradable materials or dissoluble materials. In the preliminary stage of anastomosis, magnetic-pressure anastomosis on the magnetic rings can be carried out by magnetic force provided by the magnets; and in the later stage of the anastomosis, the sizes of the magnetic rings are reduced along with degradation or dissolution of the annular shell main bodies, the annular cover plates, the inner filling materials and the like in the magnetic rings, and the magnetic anastomat can be discharged out of a human body smoothly.
Owner:XI AN JIAOTONG UNIV
Detector for Magnetic Hazards to Implanted Medical Device
A handheld detector gives a warning when a magnetic field exceeds the safety level for a particular medical implant that is magnetically activated. A front surface of the device corresponds approximately to a surface region of a patient's body in a vicinity of an implanted medical device. The magnetic detection element is located at substantially the same distance from the front surface as the control element of the medical device is from the surface region of the patient's body when the device is implanted. The detector element may be activated by a magnetic pressure, that is the vector cross product of the magnetic flux density (B) of a magnet and the applied magnetic field (H), which is less than the magnetic pressure that activates the control element of the implant device. An electronic circuit connected to the detection element may be used to indicate activation of the detection element.
Owner:DEFFEYES KENNETH S
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