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34 results about "Magnetostatics" patented technology
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Magnetostatics is the study of magnetic fields in systems where the currents are steady (not changing with time). It is the magnetic analogue of electrostatics, where the charges are stationary. The magnetization need not be static; the equations of magnetostatics can be used to predict fast magnetic switching events that occur on time scales of nanoseconds or less. Magnetostatics is even a good approximation when the currents are not static — as long as the currents do not alternate rapidly. Magnetostatics is widely used in applications of micromagnetics such as models of magnetic storage devices as in computer memory. Magnetostatic focussing can be achieved either by a permanent magnet or by passing current through a coil of wire whose axis coincides with the beam axis.
Read sensor having an in-stack biasing structure and an AP coupled free layer structure for increased magnetic stability
Owner:HITACHI GLOBAL STORAGE TECH NETHERLANDS BV
Read sensor having an in-stack biasing structure and an AP coupled free layer structure for increased magnetic stability
Current-perpendicular-to-the-plane (CPP), current-in-to-the-plane (CIP), and tunnel valve type sensors are provided having an antiparallel (AP) coupled free layer structure, an in-stack biasing structure which stabilizes the AP coupled free layer structure and a nonmagnetic spacer layer formed between the in-stack biasing layer and the AP coupled free layer structure. The AP coupled free layer structure has a first AP coupled free layer adjacent to the nonmagnetic spacer layer, a second AP coupled free layer, and an antiparallel coupling (APC) layer formed between the first and the second AP coupled free layers. The net moment of the AP coupled free layer structure has an antiparallel edge magnetostatic coupling with the in-stack biasing structure. At the same time, the first AP coupled free layer has an antiparallel exchange coupling with the second AP coupled free layer. By forming the second AP coupled free layer with a thickness greater than a thickness of the first AP coupled free layer, the AP coupled free layer structure has a net magnetic moment in the direction of the second AP coupled free layer moment. The non-magnetic spacer layer is chosen so that first AP coupled free layer has a parallel interlayer (Neel or Orange-peel or positive exchange) coupling with the in-stack biasing structure, so that the interlayer coupling adds to the edge magnetostatic coupling to increase a stability of the AP coupled free layer structure.
Owner:HITACHI GLOBAL STORAGE TECH NETHERLANDS BV
Method for nondestructively testing micro-defects in sheet ferromagnetic materials based on measurement of magnetostatic force
ActiveCN103499636AEasy to measureReduce testing costsMaterial magnetic variablesMagnetic tension forceThin slab
The invention relates to a method for nondestructively testing micro-defects in sheet ferromagnetic materials based on measurement of magnetostatic force and belongs to the technical field of nondestructive testing. The method comprises the following steps: arranging a permanent magnet on the surface of a calibration sheet, and measuring reacting force of magnetostatic force which acts on the permanent magnet by using a force sensor; arranging the permanent magnet on the surface of a sheet to be measured, and measuring reacting force stressed by the permanent magnet by using the force sensor; and comparing the two reacting forces, if the same, determining that a surface defect or an internal defect does not exist on the sheet to be measured, and if different, determining that a surface defect or an internal defect exists on the sheet to be measured. The method is simple in measurement process, relatively low in detection cost and reliable in detection result; the measurement accuracy is high, and micron order micro-defects in the magnetic sheets can be detected; the detection speed is high, and sheet materials can be rapidly detected on line in real time.
Owner:UNIVERSITY OF CHINESE ACADEMY OF SCIENCES +1
Magnetostatic field twin roller caster
InactiveCN101279326ASmall tissueLess investmentMetal rolling stand detailsRollsMagnetic polesMagnetostatics
A static magnetic field double-roll casting and rolling machine comprises a frame, an in-frame upper bearing seat, an upper casting and rolling roll, an in-frame lower bearing seat, and a lower casting and rolling roll; the upper casting and rolling roll, a first transmission shaft, a first reducer and a first DC motor are connected in sequence; the lower casting and rolling roll, a second transmission shaft, a second reducer and a second DC motor are connected in sequence. The frame is also provided with a water cooling system and a hydraulic cylinder which is used for adjusting the elevation and subsidencei of the lower casting and rolling roll; two magnetic poles are respectively contacted with the upper casting and rolling roll and the lower casting and rolling roll. The upper casting and rolling roll is contacted with a first magnetic pole; the lower casting and rolling roll is contacted with a second magnetic pole; the first magnetic pole and the second magnetic pole are connected with an iron core; the iron core is provided with a magnet exciting coil; the magnet exciting coil is connected with a DC power; the DC power applies large current on a loop manufactured by a copper tube and applies the static magnetic field generated by the loop between the clearances of the rolls by the casting and rolling rolls by the magnetic poles made from ultra-low-carbon steel. The static magnetic field double-roll casting and rolling machine of the invention can manufacture fine and purified metal plate belt materials with uniformly distributed alloy elements, no crack and high property.
Owner:辽阳市弓长岭区远大铁矿石加工厂
Closed-loop control system for nuclear magnetic resonance gyroscope of three working media
The invention relates to a closed-loop control system for a nuclear magnetic resonance gyroscope of three working media, wherein a gas chamber filled with an alkali metal gas and three working media is arranged in a nuclear magnetic resonance gyroscope device; the three working media make Larmor procession; Larmor procession frequency values omegaa1, omegaa2 and omegaa3 of the three working media are acquired through a signal separator and a frequency comparator; an arithmetic device is used for calculating the temperature T, the magnetostatic field magnitude B0 and the system angular velocity omegaR in the device; a temperature controller is used for controlling a heating chip to keep the temperature T of the nuclear magnetic resonance gyroscope device according to a feedback signal of temperature T; a magnetic field controller is used for controlling the magnetostatic field magnitude B0 in a magnetostatic field coil nuclear magnetic resonance gyroscope device according to the feedback signal of magnetostatic field magnitude B0; a signal generator and a summator are used for controlling the magnitude of the driving magnetic field coil current according to the Larmor procession frequency values omegaa1, omegaa2 and omegaa3 of the three working media and causing the three working media to keep the resonance frequency spot. The closed-loop control system provided by the invention is used for performing closed-loop control on the magnetostatic field and the temperature at the same time, so that higher precision of the system angular velocity can be achieved.
Owner:BEIJING INST OF AEROSPACE CONTROL DEVICES
Injection molding preparation method for magnetic composite material in magnetostatic field
InactiveCN105034243AControl distribution gradientChange the strength of the magnetic fieldOrganic/organic-metallic materials magnetismThermoplasticMagnetic field gradient
The invention discloses an injection molding preparation method for a magnetic composite material in a magnetostatic field. The method includes the steps that (1) a mixture of ferromagnetic particles and thermoplastic plastics or a mixture of the ferromagnetic particles, thermosetting plastics and a curing agent is heated to be evenly mixed; (2) the raw materials are injected into a mold under certain pressure, the injection temperature is 140-260 DEG C, the magnetostatic field is applied in the position of the mold, and the magnetic field strength is 0.01-2.0 T; and (3) after pressure maintaining is conducted for a period of time, the mold can be opened when plastic parts are cooled to a certain temperature, the plastic parts are pushed out of the mold under the action of an ejecting mechanism, and accordingly the product is obtained. The method has the advantages that the magnetic composite material is prepared through the mature injection molding method, and the controllable composite material with ingredients being changed continuously can be prepared conveniently within a large thickness range by adjusting the magnetic field strength, the magnetic field gradient and other preparation technological parameters.
Owner:彭晓领
Magnetostatic field magnetizing device and method at normal temperature
ActiveCN105161251AImprove magnetization efficiencyReduce energy consumptionMagnetic bodiesConveyor partsEngineeringMagnetostatics
Owner:天津博雅全鑫磁电科技有限公司
Method for enlarging moving-coil geophone magnetostatic field and a moving-coil geophone
InactiveCN101241191AHigh sensitivityImprove performanceSubsonic/sonic/ultrasonic wave measurementUsing electrical meansGeophoneDc current
The present invention relates to a method for augment static magnetic field intensity of moving-coil geo-phone and a moving-coil geo-phone. Winding coil by plane winding type on the alnico surface between upper and lower magnetic boots on moving-coil geo-phone to form multiple helix coils; supplying constant DC current to helix coils and then the magnetic field direction caused by helix coils is identical to the magnetic field direction of alnico. A moving-coil geo-phone comprises of coil rack, coil winding of upper and lower signal, alnico, upper and lower magnetic boots, and helix coil winding by plane winding type, the helix coil and signal coil on coil rack on coil rack are connected parallely, which are connected on signal transmitting line in series. The present invention has simple and reasonable structure, improves the sensitivity and capability of cymoscope efficiently.
Owner:CENT SOUTH UNIV
High-precision magnetostatic suspension accelerometer adopting multiple quadrupole coil independent regression control technology
InactiveCN110221100AImprove reliabilityAvoid difficultyAcceleration measurement using interia forcesMagnetic holding devicesAccelerometerControl system
The invention discloses a high-precision magnetostatic suspension accelerometer adopting a multiple quadrupole coil independent regression control technology, used for measuring a linear accelerationof an aircraft. The high-precision magnetostatic suspension accelerometer comprises a vacuum magnetic shielding cavity system, a magnetic field displacement sensing system, a multiple quadrupole coilmagnetic suspension control system and an inspection magnet. The accelerometer disclosed by the invention realizes real-time accurate measurement on position and attitude of the inspection magnet by adopting a magnetic field displacement sensing technology and realizes accurate regression control on position and attitude of the inspection magnet by adopting a multiple quadrupole coil independent regression control magnetic suspension technology, so that the inspection magnet is controlled to be always at the center of the cavity and a location of the mass center of a spacecraft; and when the spacecraft is effected by an external nonconservative force, magnitude and direction of the acceleration can be finally accurately measured by measuring a position control coil current as the acceleration of the aircraft is in direct proportional to the position control coil current. The accelerometer disclosed by the invention can avoid a technical bottleneck of high-precision machining, is simplein production process and can realize acceleration vector measurement with higher precision.
Owner:CHINA THREE GORGES UNIV
Matter-wave gravimeter with microwave separation at the magic field
The general field of the invention is that of matter-wave gravimeters. The gravimeter according to the invention comprises at least:means for generating, for capturing and for cooling a cloud of ultra-cold atoms;means of transferring the atoms into a superposition, with equal weights, of a first internal electronic state called state |1>) and of a second internal electronic state called state |2> comprising the application of at least a first microwave field and of a radiofrequency field;means for separating the atoms into two wave packets for a given period of time under the effect of at least a second microwave field, the said separation leading to a phase-shift associated with the local gravitational field;calibration means allowing a “magic” magnetostatic field to be determined for which the difference in energy between the first internal electronic state and the second internal electronic state is independent, to a first order, of the fluctuations of the magnetostatic field.
Owner:THALES SA
Transmission line iteration-based solving method for 2D axial symmetric nonlinear magnetostatic field model
ActiveCN106649939ASpeed up the solutionReduced solution timeDesign optimisation/simulationSpecial data processing applicationsEngineeringNonlinear element
The invention provides a transmission line iteration-based solving method for a 2D axial symmetric nonlinear magnetostatic field model. The method comprises the steps of performing coarse network division and fine network division on a solving domain; adding a corresponding transmission line between a nonlinear element and a linear network; and performing solving on a circuit through an incidence stage and a reflection stage of multi-time iteration to obtain a magnetic potential cloud chart in a 2D axial symmetric nonlinear magnetostatic field. Compared with an existing Newton iteration method, the method has a very great advantage in solving time and has a wide application prospect.
Owner:HARBIN INST OF TECH
Oscillation welding method under the effect of magnetic lens and magnetic lens device
InactiveCN101332530AControl welding processWell formed weldArc welding apparatusWeld seamAlternating current
The invention relates to an oscillation welding method under the action of a magnetic lens and a magnetic lens device. The method controls welding arc by an additional magnetic field and exerts an alternating magnetic field in the direct current welding process and a direct current (DC) magnetostatic field in the alternate current (AC) process so as to produce electromagnetic oscillation; meanwhile, the welding arc is effectively controlled by the magnetic lens device. The magnetic lens device has a double pole-shoe magnetic lens device arranged above a welding seam and a single pole-shoe magnetic lens device arranged under the welding seam. The magnetic lens device exerts the electromagnetic oscillation and the grain structure of the welding seam is converted from the original bulky columnar crystal to the fine equiaxial crystal, the magnetic field strength around the pole shoe of the magnetic lens device can be doubled when the magnetic lens device is used, which can control the electric arc more effectively. The magnetic lens device provided by the invention has the advantages of reasonable design, simple and compact structure, easy realization and convenient operation.
Owner:SHANGHAI UNIV
Magnetic resonance imaging device
InactiveCN105072990ASuppression uniformityDiagnostic recording/measuringSensorsCondensed matter physicsMagnetostatics
This magnetic resonance imaging device is provided with a magnetostatic field magnet for generating a magnetostatic field in a space inside a cylinder, and a coil mechanism which is generally cylindrical in shape, disposed within the cylinder of the magnetostatic field magnet, and including a gradient magnetic field coil for generating a gradient magnetic field. Within the coil mechanism, a magnetic body is supported independently of the gradient magnetic field coil, in such a way as to extend along the circumferential direction of the cylindrical shape in proximity to the center of the coil mechanism in the direction of the lengthwise axis.
Owner:TOSHIBA MEDICAL SYST CORP
Systems and methods for improved physiological monitoring
InactiveUS20160169838A1Magnetic property measurementsTesting waterSensor arrayMagnetic field gradient
A system and method for monitoring a subject are presented. The system includes a sensing device including at least one magnetic source to generate a magnetic field and an array of magnetic sensors disposed within the magnetic field. The sensor array obtains a plurality of magnetic field measurements at a plurality of locations along a vessel carrying a fluid including one or more magnetic particles. Further, the system includes a processing subsystem communicatively coupled to the sensing device, where the processing subsystem determines variations in the measurements caused by magnetization-relaxation of the magnetic particles based on a coupled model that defines behavior of the fluid in the varying magnetic field based on principles of magnetization-relaxation, bulk motion of the magnetic particles towards a determined gradient of the magnetic field, magnetostatics, and conservation of momentum. The processing subsystem estimates values of one or more desired parameters based on the determined variations.
Owner:GENERAL ELECTRIC CO
Method for raising orientation degree of Nd-Fe-B powder particles
InactiveCN104028744AGood orientationIncrease productivityInorganic material magnetismMechanical resistanceMaterials science
The invention discloses a method for raising an orientation degree of Nd-Fe-B powder particles. The method comprises the steps of: loading a plurality of Nd-Fe-B powder particles in a mold cavity, applying an external magnetic field on the Nd-Fe-B powder particles in the mold cavity to allow the Nd-Fe-B powder particles to rotate by the action of a magnetostatic torque force and be subjected to a magnetostatic torque which is the same as a torque generated by mechanical resistance and friction among the Nd-Fe-B powder particles, applying vibration waves on the Nd-Fe-B powder particles on the basis of keeping the external magnetic field, allowing the Nd-Fe-B powder particles to be subjected to the action of the magnetostatic torque force of the external magnetic field only when the adjacent Nd-Fe-B powder particles are separated, and therefore, allowing the Nd-Fe-B powder particles to turn to the external magnetic field. According to the method, since the vibration waves are applied on the Nd-Fe-B powder particles, c axes of the Nd-Fe-B powder particle are turned to the external magnetic field more easily, and the orientation degree of magnetic steel is raised.
Owner:SINO MAGNETICS TECH
Systems and methods for improved physiological monitoring
A system and method for monitoring a subject are presented. The system includes a sensing device including at least one magnetic source to generate a magnetic field and an array of magnetic sensors disposed within the magnetic field. The sensor array obtains a plurality of magnetic field measurements at a plurality of locations along a vessel carrying a fluid including one or more magnetic particles. Further, the system includes a processing subsystem communicatively coupled to the sensing device, where the processing subsystem determines variations in the measurements caused by magnetization-relaxation of the magnetic particles based on a coupled model that defines behavior of the fluid in the varying magnetic field based on principles of magnetization-relaxation, bulk motion of the magnetic particles towards a determined gradient of the magnetic field, magnetostatics, and conservation of momentum. The processing subsystem estimates values of one or more desired parameters based on the determined variations.
Owner:GENERAL ELECTRIC CO
Magnetostatic cushion
The invention belongs to the technical field of health care physical therapy, and provides a magnetostatic cushion. The magnetostatic cushion comprises a lumbar pelvic health care assembly, a pelvic femoral health care assembly detachably connected to the lumbar pelvic health care assembly and a reproductive system health care assembly. The reproductive system health care assembly comprises a horizontal part detachably connected to the lumbar pelvic health care assembly and a vertical part, wherein one end of the vertical part is detachably connected to the horizontal part, and the end, away from the horizontal part, of the vertical part is detachably connected to the pelvic femoral health care assembly; and the lumbar pelvic health care assembly, the pelvic femoral health care assembly and the reproductive system health care assembly comprise substrates and a plurality of permanent magnets embedded in the substrates. Compared with an existing cushion, when a user uses the magnetostatic cushion, the lumbar pelvic health care assembly, the pelvic femoral health care assembly and the reproductive system health care assembly can be wrapped on the part, corresponding to a reproductive system, of a human body, so that the permanent magnets perform magnetic therapy on the reproductive system from multiple angles, and health care effect is better.
Owner:HEYE HEALTH TECH CO LTD
Permanent magnet used for portable nuclear magnetic resonance instrument magnetostatic field generator
InactiveCN100568017CSuitable for testingSuitable for measurementMagnetic measurementsNMR - Nuclear magnetic resonanceTransverse magnetic field
One kind used for then the hold type nuclear magnetic resonance instrument quiet the magnetic field take place equip of always body, from a hollow cylinder form always body and a hollow hemisphere form always body constitute, hemisphere form the stalk of body always cuts one that the noodles folds to impose a cylinder form always a body to carry noodles up. Hollow cylinder form always body from shape homology, the magnetic field strength is equal, magnetizing a direction to revolve a direction for the body double and fan-shaped the body always constitutes. Hemisphere form always body is with the outside path be equal to a cylinder form a body always of outside path, inside path small in cylinder form always body of inside path, the stalk runs parallel with the semicircle wreath of magnetic field direction, the stalk which rounds to run parallel with a magnetic field direction revolves to get of, the hemisphere's form the body always closes the cylinder form body to carry a department at hollow type cylinder form the outside side of the body at the right moment. Hemisphere form always body and cylinder form the body always compensates a cylinder form consistently and in order to a body to always carry the horizontal magnetic field of department in the on-line magnetic field direction of the cylinder stalk inside the chamber.
Owner:INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
A closed-loop control system for NMR gyroscope with three working media
The invention relates to a closed-loop control system for a nuclear magnetic resonance gyroscope of three working media, wherein a gas chamber filled with an alkali metal gas and three working media is arranged in a nuclear magnetic resonance gyroscope device; the three working media make Larmor procession; Larmor procession frequency values omegaa1, omegaa2 and omegaa3 of the three working media are acquired through a signal separator and a frequency comparator; an arithmetic device is used for calculating the temperature T, the magnetostatic field magnitude B0 and the system angular velocity omegaR in the device; a temperature controller is used for controlling a heating chip to keep the temperature T of the nuclear magnetic resonance gyroscope device according to a feedback signal of temperature T; a magnetic field controller is used for controlling the magnetostatic field magnitude B0 in a magnetostatic field coil nuclear magnetic resonance gyroscope device according to the feedback signal of magnetostatic field magnitude B0; a signal generator and a summator are used for controlling the magnitude of the driving magnetic field coil current according to the Larmor procession frequency values omegaa1, omegaa2 and omegaa3 of the three working media and causing the three working media to keep the resonance frequency spot. The closed-loop control system provided by the invention is used for performing closed-loop control on the magnetostatic field and the temperature at the same time, so that higher precision of the system angular velocity can be achieved.
Owner:BEIJING INST OF AEROSPACE CONTROL DEVICES
Optimization method of magnetoresistive static characteristics based on sensing direction
ActiveCN106556808BLarge linear areaLarge linear regionMagnetic measurementsMagnetic reluctanceBias field
Owner:TSINGHUA UNIV +1
Magnetostatic energy power machine
The invention discloses a magnetostatic energy power machine, and relates to the field of magnetostatic energy power. The magnetostatic energy power machine comprises a guidance shaft, a power outputrotor, an outer stator, an inner stator, a guidance rotor, a control device, a guidance shaft and holes, wherein the guidance shaft, the control device, the inner stator and the guidance rotor are sequentially arranged to form a concentric structure from inside to outside, the holes are formed in the guidance shaft, two ends of the guidance shaft are fixed on an outer stator end cover, the inner stator is fixedly connected with the guidance shaft, two ends of the guidance rotor are movably connected with the guidance shaft, and the guidance rotor is engaged with the power output rotor in a magnetic suspension way. The magnetostatic energy power machine is simple in structure and remarkable in effect; the magnetostatic energy among the inner stator, the outer stator and the guidance rotor is used for doing work, so that the power output rotor is driven to rotate and output power during rotation of the guidance rotor; and the magnetostatic energy power machine has the advantages of simplicity, practicability, low energy consumption, no pollution, low cost of materials and no waste and is suitable for production activity such as power generation and mechanical transmission.
Owner:刘邦强
Magnetostatic method for online monitoring vibration marks of magneto-conductive continuous casting billet
ActiveCN105983664ALow costEasy to measureCasting parameters measurement/indication devicesMagnetizationForce sensor
The invention relates to a magnetostatic method for online monitoring vibration marks of a magneto-conductive continuous casting billet. The magnetostatic method comprises the following steps that a permanent magnet is arranged on the surface of a continuous casting billet in the continuous pulling down process, wherein the magnetization direction of the permanent magnet is perpendicular to the billet surface, to be detected, of the continuous casting billet to be detected; by utilizing calibration of a vibration mark-free continuous casting billet with the same material as the continuous casting billet to be detected, a force sensor is used to determine the counter-force F0' applied to the magnetostatic force F0 on a magnet; and the continuous casting billet, to be detected, with the vibration marks is determined and passes through the lower side of the permanent magnet, a bulge or a depression formed in the surface of the continuous casting billet to be detected can make the permanent magnet vary by subjecting to the counter-force F0' of the magnetostatic force, the force sensor which is connected with the end part of the permanent magnet is used to measure the counter-force F0' applied to the permanent magnet, and thus information of the vibration marks of the surface of the continuous casting billet to be detected is obtained. The magnetostatic method for online monitoring the vibration marks of the magneto-conductive continuous casting billet is simple and convenient, is accurate in result and can monitor variations of the vibration marks according to signal analysis on defects.
Owner:UNIVERSITY OF CHINESE ACADEMY OF SCIENCES +1
Quantum chip package device
ActiveCN108966624AAchieve shieldingGuaranteed working environmentScreening casingsWorking environmentQuantum
The present invention belongs to the field of chip package, and especially discloses a quantum chip package device. The quantum chip package device comprises: an electromagnetic shielding package boxconfigured to horizontally putting a quantum chip to be packaged and having an electromagnetic shielding effect; and a magnetostatic shielding cover coating the external portion of the electromagneticshielding package box and having a magnetostatic shielding effect. For the demand for the severe work environment of the quantum chip, the present invention provides a quantum chip package device with two layers of shielding structures, wherein the two layers of shielding structures are the electromagnetic shielding package box having the electromagnetic shielding effect and the magnetostatic shielding cover having the magnetostatic shielding effect coating the external portion of the electromagnetic shielding package box, the layers of the shielding structures work together to achieve shielding of different types of magnetic fields and magnetic fields with different intensities so as to commonly guarantee the work environment of the quantum chip to be packaged in the electromagnetic shielding package box.
Owner:ORIGIN QUANTUM COMPUTING TECH (HEFEI) CO LTD
High Precision Magnetic Suspension Accelerometer
InactiveCN105675920BAvoid the bottleneck of difficult processingAccurate measurementAcceleration measurementManufacturing technologyAccelerometer
The invention discloses a high-precision static magnetic suspension accelerometer, and the accelerometer is used for measuring the linear accelerometer of an aircraft. The accelerometer comprises a vacuum magnetic shielding chamber system, a magnetic field displacement sensing system, a static magnetic suspension control system, and an examination magnet. The accelerometer employs the technology of magnetic field displacement sensing to achieve the real-time precise measurement of the position and posture of the examination magnet, and employs the technology of static magnetic suspension control to achieve the precise regression control of the position and posture of the examination magnet, thereby enabling the examination magnet to be continuously controlled at the center of a chamber, i.e., the center of mass of a space aircraft. When an external nonconservative force acts on the space aircraft, the size and direction of the acceleration can be precisely measured finally through the measurement of the current of a position control coil because the acceleration of the aircraft will be in direct proportion to the amplitude of the current of the position control coil. The accelerometer can avoid a technical bottleneck of high-precision machining, is simple in manufacturing technology, and can achieve higher-precision acceleration vector measurement.
Owner:CHINA THREE GORGES UNIV
A static magnetostatic force method for online monitoring of vibration marks of magnetically conductive continuous casting billets
ActiveCN105983664BLow costEasy to measureCasting parameters measurement/indication devicesMagnetizationForce sensor
Owner:UNIVERSITY OF CHINESE ACADEMY OF SCIENCES +1
Matter-wave gravimeter with microwave separation at the magic field
The general field of the invention is that of matter-wave gravimeters. The gravimeter according to the invention comprises at least:means for generating, for capturing and for cooling a cloud of ultra-cold atoms;means of transferring the atoms into a superposition, with equal weights, of a first internal electronic state called state |1>) and of a second internal electronic state called state |2> comprising the application of at least a first microwave field and of a radiofrequency field;means for separating the atoms into two wave packets for a given period of time under the effect of at least a second microwave field, the said separation leading to a phase-shift associated with the local gravitational field;calibration means allowing a “magic” magnetostatic field to be determined for which the difference in energy between the first internal electronic state and the second internal electronic state is independent, to a first order, of the fluctuations of the magnetostatic field.
Owner:THALES SA
Magnetooptic recording medium and reproducing method therefor
The present invention relates to a magneto-optical recording medium and reproduce method, in particular, a magneto-optical recording medium and reproduce method, which reproducing a high recording density information with a reliable and sufficient reproducing signal intensity. A magneto-optical recording medium comprises a recording layer 5, an intermediate layer 4, and a reproducing layer 3. The reproducing layer 3 is formed of a rare earth transition metal alloy in which rare earth metal is dominant, and each of the intermediate layer 4 and the recording layer 5 is formed of a rare earth transition metal alloy in which transition metal is dominant. The intermediate layer 4 exhibits in-plane magnetization at a temperature of not less than 140 DEG C. Therefore, the intermediate layer 4 cuts off the exchange coupling force between the recording layer 5 and the reproducing layer 3 during the reproduction. A magnetic domain 3A, which is transferred to the reproducing layer 3, is expanded to a size of a minimum magnetic domain diameter by the magnetostatic repulsive force exerted between the magnetic domain in the intermediate layer 4 and the magnetic domain in the reproducing layer. It is possible to obtain a reproduced signal having an amplified intensity without generating any ghost signal by the magnetic domain expansion reproduction.
Owner:HITACHT MAXELL LTD
Magnetostatic Voltage/Current Limiting System for Wind Turbine Generator Comprising the Same
InactiveUS20150130331A1Reduce disadvantagesLimited amountWind energy generationStructural associationCurrent limitingControl circuit
A magnetic voltage / current limiting system is mounted in conjunction with a main coil, in a coil assembly of a wind turbine generator, for limiting the outputted voltage (or current) to a predetermined upper value. The limiting system generally comprises at least one limiting coil and a control circuit connected to the main coil. The limiting system is configured to be activated when the voltage (or current) outputted by the main coil increases beyond the predetermined upper value. Once activated, the limiting system diverts a portion of the outputted current to the limiting coil such as to generate a magnetic field in the limiting coil. This additional magnetic field generally limits the amount magnetic field generated by passing magnets to flow through the main coil, thereby limiting the outputted voltage.
Owner:BEAULIEU ANDRE
Nondestructive detection method for micro-defects in thin ferromagnetic materials based on static magnetometry
ActiveCN103499636BEasy to measureReduce testing costsMaterial magnetic variablesMagnetic tension forceForce sensor
The invention relates to a method for nondestructively testing micro-defects in sheet ferromagnetic materials based on measurement of magnetostatic force and belongs to the technical field of nondestructive testing. The method comprises the following steps: arranging a permanent magnet on the surface of a calibration sheet, and measuring reacting force of magnetostatic force which acts on the permanent magnet by using a force sensor; arranging the permanent magnet on the surface of a sheet to be measured, and measuring reacting force stressed by the permanent magnet by using the force sensor; and comparing the two reacting forces, if the same, determining that a surface defect or an internal defect does not exist on the sheet to be measured, and if different, determining that a surface defect or an internal defect exists on the sheet to be measured. The method is simple in measurement process, relatively low in detection cost and reliable in detection result; the measurement accuracy is high, and micron order micro-defects in the magnetic sheets can be detected; the detection speed is high, and sheet materials can be rapidly detected on line in real time.
Owner:UNIVERSITY OF CHINESE ACADEMY OF SCIENCES +1
Oscillation welding method under the effect of magnetic lens and magnetic lens device
InactiveCN101332530BIncrease the magnetic field strengthReasonable designArc welding apparatusWeld seamAlternating current
The invention relates to an oscillation welding method under the action of a magnetic lens and a magnetic lens device. The method controls welding arc by an additional magnetic field and exerts an alternating magnetic field in the direct current welding process and a direct current (DC) magnetostatic field in the alternate current (AC) process so as to produce electromagnetic oscillation; meanwhile, the welding arc is effectively controlled by the magnetic lens device. The magnetic lens device has a double pole-shoe magnetic lens device arranged above a welding seam and a single pole-shoe magnetic lens device arranged under the welding seam. The magnetic lens device exerts the electromagnetic oscillation and the grain structure of the welding seam is converted from the original bulky columnar crystal to the fine equiaxial crystal, the magnetic field strength around the pole shoe of the magnetic lens device can be doubled when the magnetic lens device is used, which can control the electric arc more effectively. The magnetic lens device provided by the invention has the advantages of reasonable design, simple and compact structure, easy realization and convenient operation.
Owner:SHANGHAI UNIV
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