272results about How to "Uniform magnetic field" patented technology

The present invention relates to a double magnetic path structure of large-stroke electromagnetic vibration table. Said double magnetic path structure includes coaxially successively-connected first magnetic body, first central magnetic ring, central magnetic pole, second central magnetic ring and second magnetic body. Said first magnetic body and second magnetic body are respectively fixed in the outer shell interior, a cylindrical coil and an outer magnetic pole are coaxially cover-mounted on the exterior of central magnetic pole, and two ends of said outer magnetic pole are fastened with outer shell end port. Said invention also provides the working principle said double magnetic path structure and its concrete operation method.

A magnetic deflector for an ion beam is disclosed and comprises first and second coils. The coils are positioned above and below the beam, respectively, and extend along a width of the beam. Current passes through the coils to generate a magnetic field therebetween that is generally perpendicular to a direction of travel of the beam along substantially the entire width thereof. In another aspect of the invention, a method of deflecting a beam prior to implantation into a workpiece is disclosed. The method includes determining one or more properties associated with the beam and selectively activating one of a magnetic deflection module and an electrostatic deflection module based on the determination.

An inductive power transfer transmitter that includes an enclosure for accommodating devices to be energised. The enclosure has one or more side walls and one or more coils for generating an alternating magnetic field within the enclosure. The density of the one or more coils varies with distance from an end of the one or more sidewalls. There is also disclosed an inductive power transmitter that includes one or more magnetically permeable layers wherein the combined thickness or the permeability of the one or more magnetically permeable layers varies.

The invention relates to a nuclear magnetic resonance magnetic field and a preparation method thereof, which belong to the field of rare earth permanent magnetic materials and nuclear magnetic resonance imaging. The invention particularly relates to a high-field-intensity focusing nuclear magnetic resonance magnetic field and a preparation method thereof. The high-field-intensity focusing nuclear magnetic resonance magnetic field adopts a dual-column C-shaped open structure; a C-shaped machine frame adopts 45# steel with high mechanical strength and magnetic conductivity and a composite polar plate, and is designed with a magnetic gathering ring; and simultaneously the distance between the polar plate and a vertical supporting yoke is increased, and a passive artificial shimming and an active computer-assisted shimming are adopted. The preparation method can prepare a high-field-intensity focusing magnet, has an easily controlled technological process and is suitable for batch production.

A heat-treating furnace with a magnetic field comprising (a) a magnetic field-generating means constituted by an outer, ring-shaped, permanent magnet assembly comprising a plurality of permanent magnet segments combined with their magnetization directions oriented such that a magnetic flux flows in a diameter direction, and an inner, ring-shaped, permanent magnet assembly disposed inside the outer, ring-shaped, permanent magnet assembly and comprising a plurality of permanent magnet segments combined with their magnetization directions oriented such that a magnetic flux flows in a diameter direction; and (b) a heat treatment means disposed in a center hole of the inner, ring-shaped, permanent magnet assembly and comprising a cooling means, a heating means, and a heat-treating container containing heat-treating holder for holding a plurality of articles to be heat-treated in this order from outside, wherein an axial center of a magnetic field generated by the inner and outer ring-shaped, permanent magnet assemblies is substantially identical with an axial center of an article assembly in the heat-treating container.

The invention discloses an electromagnetic valve welding method and an electromagnetic valve welding for solar cells. The method comprises the following steps of: superposing the solar cells and welding strips on a non-magnetic workbench and allowing the welding strips to contact bus bars of the solar cells; pressing the welding strips and the cells together by using an elastic pressing device; supplying power to a copper pipe induction coil, which is arranged below the workbench surface, by using a high-frequency power supply, wherein the copper pipe induction coil is 'u'-shaped; allowing a cooling medium which flows in the inner part of the copper pipe induction coil to cool the copper pipe induction coil; uniformly heating the welding strips and the bus bars of the panels with high-frequency oscillation electromagnetic waves generated by the copper pipe induction coil; and welding the welding strips and the bus bars of the panels together. The device comprises the workbench, the elastic pressing device and the high-frequency power supply, wherein the elastic pressing device is arranged above the workbench; the high-frequency power supply is connected with the copper pipe induction coil; and the copper pipe induction ring is 'u'-shaped and fixed below the workbench surface. The electromagnetic valve welding method and the electromagnetic valve welding for the solar cells have the advantages of high heating speed, high production efficiency, simple structure, uniform magnetic field and high welding quality.

The present invention provides a superconductivity magnet apparatus for generating a uniform magnetic field suitable for NMR applications. The superconductivity magnet apparatus has an access port for allowing an access to the center of the magnetic field from an external position separated away from the center in a direction other than the axial direction of a split-type superconductivity electromagnet employed in the magnet apparatus. In the superconductivity magnet apparatus, a gap exists between first and second superconductivity coil blocks facing each other to form the split-type superconductivity electromagnet. To put it in detail, the access port allows an access to a measurement space at the center of the magnet by way of the gap. A configuration element of the magnet such as a coil bobbin is cut out for providing the access port. An area including a deficiency portion caused by the cutout portion or the like is filled up with a material having a relative magnetic permeability in the range 1.000 to 1.002 as an axis-symmetrical area. By using the material with a relative magnetic permeability in the range 1.000 to 1.002, the strength of an erroneously generated magnetic field can be reduced so that a magnet producing a uniform magnetic field can be provided.

A magnet device includes two sets of static magnetic field generation sources spaced from each other in the vertical direction such that the uniform magnetic field region (patient space) is between then. Each set has concentric current carrying coils to generate a uniform magnetic field in a first direction (the vertical direction). Several such coils are used in each set, disposed such that when a first axis which is parallel to the first (vertical) direction and passes substantially through the centers of the current carrying coils crosses, at a first point, a second axis which is orthogonal to the first axis and is at substantially equal distance from the respective static magnetic field generation sources, the current carrying coils are disposed in such a manner that when geometrical centers of cross sections of the current carrying coils are projected on a first straight line that is in a first plane containing the first axis, the second axis and the first point and passing through the first point, the directions of the currents of the carrying coils at the respective corresponding projections align alternatively in positive and negative directions on the first straight line.

A method for identifying a buried metal object using a three-dimensional steerable magnetic field (3DSMF) system. The method comprises generating a magnetic field vector (MFV) at a first MFV position above the buried metal object; measuring a time decay response at the first MFV position; generating a MFV at a next MFV position above the buried metal object; measuring a time decay response at the next MFV position; repeating the above steps until a complete 360-degree measurement of time decay responses of the buried metal object is completed; processing all measured time decay responses with a target search algorithm to determine a magnetic polarizability tensor of the buried metal object; and identifying the buried metal object by matching the magnetic polarizability tensor of the buried metal object to a known magnetic polarizability tensor of an object.

The invention provides a current sensor and a measuring apparatus. The current sensor includes a magnetic induction unit and a processing unit provided on the outside of the wire to be measured, the magnetic induction unit is used for sensing a magnetic field generated by a current flowing through the wire to be measured and obtaining an induced signal corresponding to magnetic field intensity; the input end of the processing unit is electrically connected with the output end of the magnetic induction unit to process the induced signal, and at least one pair of magnetic induction units are arranged on the outside of the wire to be measured, the processing unit obtains the value of the current flowing through the measured wire through differential operation based on the paired induced signals. The current sensor is high in measurement accuracy, high in anti-interference capability, and low in installation requirement.

The invention discloses a multi-robot precision machining system and a method for a large-aperture integral optical element. The multi-robot precision machining system comprises a robot machining system part and a modular machining tool, the modular machining tool comprises a grinding disk machining module, a polishing fluid supply recycling tool head module and a magnetorheological polishing toolhead module. The multi-robot precision machining system and method adopts a flexible intelligent robot with the low cost for machining, by means of multi-robot collaborative machining, machining of large-aperture integrated optical elements with various curvature is realized, meanwhile, the manufacturing efficiency of the optical elements is greatly improved, and a highly integrated modular chemical tool head enables the machining system to be able to conduct grinding modification, polishing modification and precision polishing modification on the large-aperture integral optical elements. Thesystem completes the whole optical machining process, the manufacturing cost of the large-aperture optical elements is greatly saved, and the cycle of the large-aperture optical elements is greatly shortened.

The invention relates to a multi-core integrated branch cable and a production method thereof. The multi-core integrated branch cable comprises a main cable, branch cables, connecting fixtures and the like, wherein the main cable or each branch cable is formed by twisting 2 to 5 insulated conductors into a core wire, winding, coating and binding the core wire by bags into a cable core, and coating a layer of plastic outer sheath on the cable core through extrusion; the main cable is provided with phase conductor openings connected with terminations of the branch cables; the phase conductor openings are staggered at equal intervals in turn; copper conductors of the terminations of the branch cables with the same phase are in crimp connection with copper conductors at the phase conductor openings of the main cable into a branch connecting body through the connecting fixtures and a compression mould; the crimp connection part is coated with an ethylene propylene rubber self-adhesive tape which is coated with a cross-linked polythene insulation layer; and a sheath of the branch connecting body is moulded on the insulation layer. The multi-core integrated branch cable has a reasonable and compact structure, realizes that a single cable replaces four or five single core cables for use, and has simple laying and small occupied space.

The invention discloses a uniwafer three-disk magnetic rheological clutch which comprises a drive shaft (1), a driven shaft (2), a drive disk (11), a magnet exciting coil (4), a magneto rheological left disk channel (9), a magneto rheological right disk channel (8), a magneto rheological circular channel (7), a left shell (14), a left driven member (15), a right shell (17), a right driven member (16), a drive disk magnetism-isolating copper ring (10), a driven member magnetism-isolating copper ring (5), an angle contact ball bearing (3), a thrust ball bearing (12), a magneto rheological liquid (20) and a sealing device, wherein the drive disk (11) is positioned in a cavity surrounded by the left driven member (15), the right driven member (16) and a driven connecting member (6), and the magneto rheological liquid is filled in the cavity; and magnetic fields vertical to three disk surfaces of the drive disk (11) pass through the same, which can more effectively develop magneto rheological effect. The invention overcomes the defects of slow response, easy abrasion, large noise, more heat generation, unstable control and the like of the traditional clutch, and has the advantages of smaller volume, bigger drive torque, simpler structural design and less power consumption compared with the traditional magneto rheological clutch.

The invention discloses a special magnetic resonance imaging device for a baby. The special magnetic resonance imaging device comprises a magnetic resonance imager, a filter board (20), a control device, a software system and a display system. The magnetic resonance imager consists of a superconducting magnet (1), a radio frequency system (2), a gradient system (7) and a patient supporting system (3). The superconducting magnet (1) comprises a superconducting magnetic field coil (5), a driving and driven shimming system (6) and a refrigerating system (4). The diameters of the inner walls of the superconducting magnetic field coil (5), the driving and driven shimming system (6) and the gradient system (7) are sequentially arranged in descending order. The refrigerating system is a classified refrigeration cycle system. By the adoption of the structure, the magnetic field is uniform; and the temperature variation is smooth and the environment is stable by the space positioning of a magnetic resonance imaging system signal and the two-stage refrigeration cycle system.

A steerable electromagnetic induction (EMI) sensor system for measuring the magnetic polarizability tensor of a metal target. Instead of creating a vertical magnetic field from a horizontal loop transmitter configuration used by most prior art EMI metal detectors, the transmitter geometry of the sensor system's antenna is designed especially for creating multiple horizontal and vertical magnetic fields and for steering the same in all directions. The horizontal magnetic field (HMF) antenna has the potential advantage of a relatively uniform magnetic field over a large volume. A second potential advantage of the HMF antenna is that compared to a conventional loop antenna, the magnetic field intensity falls off slowly with distance from the plane of the antenna. Combining two HMF sensor systems creates a steerable two-dimensional magnetic field sensor. Combining the steerable HMF sensor with a vertical magnetic field antenna forms a three-dimensional steerable magnetic field sensor system.

The invention discloses a permanent-magnet packaging relativistic magnetron, which is of a whole-cavity extraction axial output structure composed of a cathode outer cylinder, an anode outer cylinder and an axial extraction structure. The permanent-magnet packaging relativistic magnetron comprises a plurality of annular permanent magnets, wherein a part of the permanent magnets sleeve the anode outer cylinder, the other part of the permanent magnets sleeve a cathode in the anode outer cylinder, and the permanent magnets and the magnetron are coaxially arranged. The permanent-magnet packaging relativistic magnetron adopts the internal embedding and external loading combined method for arranging the permanent magnets, enlarges size of the uniform region of the permanent magnets, a part of the permanent magnets are embedded in the interior of the magnetron, the internal space of the magnetron is fully utilized, so that the whole permanent-magnet packaging structure is compact. The permanent-magnet packaging structure can provide the required uniform magnetic field for the relativistic magnetron stably for a long time, so that the relativistic magnetron operates and generates gigawatt-level high-power microwave output, and can be well applied to compact-structured high-power microwave systems running at repeated frequency.

The invention discloses a magnetic material powder forming mold, which comprises a female die, wherein a female die cavity is arranged in the female die; and the saturation polarization strength of at least one side face of the female die cavity is consistent with the saturation polarization strength of magnetic material powder to be pressed. According to the magnetic material powder forming mold, the saturation polarization strength of the at least one side face of the female die cavity is consistent with the saturation polarization strength of the magnetic material powder, so that an edge distortion phenomenon of a magnetic field is transferred from the magnetic material powder to a side face of the female die cavity made of the material, the magnetic field of the magnetic material powder is guaranteed to be a uniform magnetic field, and the performance of a blank made through the mold is guaranteed. Because of an arrangement mode of an isolating plate, the material with the saturation polarization strength consistent with that of the magnetic material powder is arranged on different side faces according to different requirements, so that the application range is wide and the pressing of the magnetic powder is not affected.

The invention provides a crankshaft magnetic detector comprising a main body and a control cabinet, wherein a head frame chunk and a tail frame chunk are arranged on a guide rail of a main body frame assembly to clamp an electrified circumferential magnetizing device, a left head-frame chunk base is fixed, the position of a right tail-frame chunk base can be moved and locked according to the length of a crankshaft, an air cylinder which is used for clamping the crankshaft is arranged behind the tail frame chunk, conducting plates which are electrified after clamping the crankshaft are respectively arranged on shafts of the head frame chunk and the tail frame chunk, and the left and right sides of the frame assembly are respectively provided with an electric case and a device pneumatic control case. The crankshaft magnetic detector is characterized in that a multiturn longitudinal magnetizing coil which can longitudinally extend is arranged between the head frame chunk and the tail frame chunk, and a workpiece rotating device is arranged on the chunk conducting plates. The crank magnetic detector can complete longitudinal magnetization or complex magnetization of the whole length of the crankshaft with a length between 800mm and 1500mm once, sufficiently and evenly magnetizes the parts of the crankshaft, is safe and reliable and has low failure rate.

The invention discloses a device and a method for detecting the force electromagnetic coupling behavior of a giant magneto resistive film, and belongs to the technical field of engineering materials, structural deformation, mechanics experiment and electrical experiment. The device comprises a magnetic field generator, a giant magneto resistive film hysteresis loop measurement optical path, a film stress measurement optical path, and a film resistance probe tester. The giant magneto resistive film hysteresis loop measurement optical path comprises a laser, diaphragms, reflectors, a polarizer, an analyzer, a lens and a photoelectric detector; and the film stress measurement optical path comprises a laser, a spatial filter, a calibrator, reflectors, and a charge couple device (CCD) camera. A uniform magnetic field is provided by the magnetic field generator; the hysteresis loop is measured according to a magneto-optic Kerr effect; curvature of the surface of the film is measured by a multi-beam optical stress sensitivity technology; the stress of the film is obtained according to the relation expression of the curvature and the stress; the resistivity of a film material is measured by the film resistance probe tester; and coupling relational expressions of the resistance of the giant magneto resistive film and the magnetic induction density and stress of the film can be obtained finally.