51 results about "Radial field" patented technology

A perpendicular magnetic recording disk having a single domain exchange-coupled laminated soft magnetic underlayer (SUL) is disclosed. The SUL is a combination synthetic anti-parallel coupled SUL structure, which has the product (Mst) of saturation magnetization and film thickness of the middle ferromagnetic layer less than the sum of the Mst of the bottom and top ferromagnetic layers. Subjected to a post radial field reset process, this SUL provides single domain state. Moreover, both robustness of stray fields and low permeability are obtained while keeping excellent corrosion resistance and cost effective manufacturability.

A rotor for an electrical motor may include a plurality of salient radial field rotor poles and a plurality of salient axial field rotor poles. The radial field rotor poles and the axial field rotor poles are respectively oriented on the rotor to receive or convey substantially perpendicular flux fields. Additionally, the radial field rotor poles may include both inner and outer peripheral rotor poles for communicating radial flux fields with separate coaxial stators.

A rotor for an electrical motor may include a plurality of salient radial field rotor poles and a plurality of salient axial field rotor poles. The radial field rotor poles and the axial field rotor poles are respectively oriented on the rotor to receive or convey substantially perpendicular flux fields. Additionally, the radial field rotor poles may include both inner and outer peripheral rotor poles for communicating radial flux fields with separate coaxial stators.

At least one set of two nested magnetic arrays is provided, each nested magnetic array having an outer magnet, a middle magnet, and an inner magnet. The outer magnet has a magnetization pointing in an at least partially axial direction. The middle magnet has a magnetization substantially perpendicular to the magnetization of the outer magnet. The inner magnet has a magnetization directed substantially anti-parallel to the magnetization of the outer magnet. The apparatus also includes at least one electrically conductive coil positioned at least partially between the two nested magnetic arrays. At least one substantially magnetically permeable object is positioned at least partially between the two nested magnetic arrays. A rod is integral with the substantially magnetically permeable object.

A torque transducer system comprises a disc through which torque is transmitted in a radial direction and which has a magnetised annular region which emanates a torque-dependent magnetic field. A non-contacting magnetic field sensor detects the emanated field. The annular region comprises segments by means of which a pulsed magnetic field is emanated as the disc rotates. The segments may be magnetically unipolar and spatially separated or of alternate polarity. They may be integral with the disc of or material applied to the disc that is magnetised or that segments an underlying magnetisation in the disc. The preferred direction of magnetisation is radial and the effect of the orientation of a sensor with respect to the radial field is discussed. One sensor arrangement comprises a pair of sensors oriented at an angle to one another with reference to the radial field. The teachings of the invention can be applied to the segmentation of an integral transducer region of a torque-transmitting shaft, the region having an annulus of axially-directed remanent magnetization.

At least one set of two magnets is provided, at least one of the magnets having an outer magnet portion, a middle magnet portion, and an inner magnet portion. The outer magnet portion has a magnetization pointing in an at least partially axial direction. The middle magnet portion has a magnetization substantially perpendicular to the magnetization of the outer magnet portion. The inner magnet portion has a magnetization directed substantially anti-parallel to the magnetization of the outer magnet portion. The apparatus also includes at least one electrically conductive coil positioned at least partially between the set of two magnets. At least one substantially magnetically permeable object is positioned at least partially between the set of two magnets. A rod is integral with the substantially magnetically permeable object.

The invention provides a multi-blade collimator, which comprises a first blade mechanism and a second blade mechanism installed on a main frame along a first direction, wherein the first blade mechanism includes a plurality of blades for forming a first radial field; a second blade mechanism includes a plurality of blades for forming a second radial field; the first blade mechanism rotates around a second axial direction; and at least parts of the projections of the first radial field and the second radial field overlap along the second axial direction. In the technical scheme above, the overlapped part, of the first radial field and the second radial field along the second axial direction, is the final radial field of the multi-blade collimator. The first blade mechanism can rotate around the second axial direction to allow the multi-blade collimator to adjust the shape of the overlapped part of the first radial field and the second radial field according to the shape required by a radiated part and through adjusting a rotation angle of the first blade mechanism. Therefore, the radial structure finally formed of the multi-blade collimator is adjusted, so that an adaptive shape degree of the radial filed of the multi-blade collimator is improved.

The invention provides a machining method for a high-voltage capacitive dry-type bushing. According to the method, Radial field intensity is the most uniform when partial discharge margins are equal, the method is different from a method for an oil-filled bushing with average field intensity, and the bushing machined by the method has a smaller structural size and better electrical performance as compared with an existing bushing. The machining method for the high-voltage capacitive dry-type bushing mainly includes the steps of core rolling, vacuum gum dipping and forming.

Disclosed is a multifrequency electro-magnetic field generator that is capable of generating electro-magnetic flux fields that are projected at a distance from the device. Radial fields, horizontal fields and spiral fields are generated by the electro-magnetic field generator and are projected at a distance sufficient to engage a user of the device. A wide range of frequencies is generated as a result of the fast rise time pulses produced by the device. The geometry and structure of the device cause the electro-magnetic fields to encircle the device and be collected at the far end of the device by an antenna. This geometry and structure aid in the projection of the electro-magnetic fields.

At least one set of two nested magnetic arrays is provided, each nested magnetic array having an outer magnet, a middle magnet, and an inner magnet. The outer magnet has a magnetization pointing in an at least partially axial direction. The middle magnet has a magnetization substantially perpendicular to the magnetization of the outer magnet. The inner magnet has a magnetization directed substantially anti-parallel to the magnetization of the outer magnet. The apparatus also includes at least one electrically conductive coil positioned at least partially between the two nested magnetic arrays. At least one substantially magnetically permeable object is positioned at least partially between the two nested magnetic arrays. A rod is integral with the substantially magnetically permeable object.

The invention relates to a radio frequency plasma chamber meeting the mechanism that negative hydrogen ions are generated through plasmas and belongs to the field of neutral beam heating in the controlled magnetic confinement nuclear fusion auxiliary heating technology. According to the radio frequency plasma chamber, the upper end of a discharging source region chamber is connected with a first air inlet and a preionization electrode flange in a sealing mode, and the lower end of the discharging source region chamber is fixedly sealed in the middle of a sealing cover at the upper portion of a diffusion chamber; the sealing cover at the upper portion of the diffusion chamber is provided with a second air inlet, and the lower end of the diffusion chamber is fixedly sealed to a bottom plate. A discharging coil is wound in the middle of the outer side of the discharging source region chamber, and the upper end and the lower end of the discharging coil are each provided with a first magnetic field coil; a second magnetic field coil generating a radial field is arranged at the bottom of the diffusion chamber. Through the radio frequency plasma chamber, the top of the diffusion chamber can be supplemented with fresh hydrogen; after the hydrogen collides with high-energy electrons diffused down from a source region, the density of excited vibrational-state hydrogen molecules in the plasmas in the diffusion region is increased, the electron temperature is decreased, and the probability that the negative hydrogen ions are generated in the plasmas is increased.

A laser-produced plasma extreme ultraviolet source has a buffer gas to slow ions down and thermalize them in a low temperature plasma. The plasma is initially trapped in a symmetrical cusp magnetic field configuration with a low magnetic field barrier to radial motion. Plasma overflows in a full range of radial directions and is conducted by radial field lines to a large area annular array of beam dumps.

The invention discloses a reciprocal radial field electric machine based on the soft magnetic attraction principle, characterized by a plurality of active elements organized as a bi-dimensional cylindrical machine matrix and fed sequentially by an external power converter in order to derive a motoring or generation effect. The machine is comprised of a fixed stator matrix featuring salient poles and electrical coils, and a mobile rotor matrix featuring salient poles. The machine works on the principle of time integration of the discrete actions performed by its active elements. The bi-dimensional matrix organization of the active elements and the algorithms of their activation in both motoring and generation modes are key features for the functional cohesion of the machine. The design of this machine is based on a unique digital modeling method developed by the inventors, using exclusively the matrix calculus adapted to cylindrical matrices.

The invention relates to the technical fields of electromagnetic fields and microwaves, in particular to an implementation method of a wideband high-gain wide beam oblique polarization horn antenna. The method includes the following steps of: using an E-surface dual-ridged guided wave to excite a four-ridged horn to obtain a wide beam, and forming E-surface radial field distribution at the four-ridged horn mouth surface; arranging a semi-circular metal piece at the four-ridged horn mouth surface to perform shaping of the antenna wide beam; arranging an oblique polarizer at the antenna mouth surface to achieve polarization torsion. The method of E-surface dual-ridged guided wave exciting the four-ridged horn and the semi-circular metal piece performing shaping in a direction map is employedto achieve the miniaturization problem of the radial mode horn to allow the horn antenna radiation direction map to be close to the radial mode horn, reduce the mouth diameter for 40% and allow the bandwidth to be 3:1. The gain is not smaller than 3dB in the range from -45 degrees to 45 degrees on the azimuth plane. The present invention further discloses a structure of a wideband high-gain widebeam oblique polarization horn antenna.

An apparatus and method for preconditioning a magnetic recording disk is provided in which two substantially identical, but opposing, pancake coils are disposed generally parallel to one another with a gap therebetween into which a disk to be preconditioned is inserted. A large pulse of current is delivered to the coils to generate a magnetic field that is sufficiently strong to precondition the disk. The radial fields of each respective pancake coil add together in the gap where the disk is located, and the field presets both the data layer and the hard bias layer of the SUL. Outside of the gap region, the fields cancel one another such that there are essentially no perpendicular fields due to the symmetry of the coils, such that there is very little net residual perpendicular magnetization when the disk is removed from the gap. An electrical circuit for producing the current pulse is provided. An aluminum support structure provides thermal management and magnetic flux conductivity for the system.

The invention provides a shaft radial field tapered switch reluctance disc type electric machine. The electric machine comprises a central shaft and a stator and a rotor which are sleeved on the central shaft, wherein both of the stator and the rotor are of disc-type tapered shapes, 12N or 8N tooth spaces are formed in the stator, 8N or 6N tooth spaces are correspondingly formed in the rotor, wherein N is a natural number which is not smaller than 1. Compared with the prior art, the shaft radial field tapered switch reluctance disc type electric machine has the characteristics of reasonability in design, simplicity in structure, convenience in use and the like, and the operation centripetal force of the electric machine can be stronger; and the electric machine can efficiently operate in a low-speed state under different power requirements, and consequently has very good popularization and use values.

A magnetic particle inspection (MPI) apparatus is disclosed that includes a chordal field coil pair and a radial field coil pair. The chordal field coil pair includes first and second chordal field coils configured to produce a chordally oriented magnetic flux about a test article.

A laser-produced plasma extreme ultraviolet source has a buffer gas to slow ions down and thermalize them in a low temperature plasma. The plasma is initially trapped in a symmetrical cusp magnetic field configuration with a low magnetic field barrier to radial motion. Plasma overflows in a full range of radial directions and is conducted by radial field lines to a large area annular array of beam dumps.

The invention relates to a bus terminal accessory of an ethylene-propylene insulation copper pipe, and belongs to the technical field of power equipment. The accessory comprises a hollow insulation pipe and semiconduction stress cones, wherein the semiconduction stress cones are arranged at one end of the insulation pipe and are in hollow truncated cone shapes, one end with a large radius of each semiconduction stress cone faces the insulation pipe, the semiconduction stress cones are wrapped by the insulation pipe, and a plurality of umbrella skirts are arranged on an outer surface of the insulation pipe. In the bus terminal accessory of the ethylene-propylene insulation copper pipe, provided by the invention, a liquid silicone rubber material is adopted, the accessory is formed by die pressing high-temperature curing, the semiconduction stress cones are overlapped with the insulation pipe to achieve an effect of uniform insulation shielding, and the radial field intensity and longitudinal field intensity of an insulation shielding opening can be perfectly uniform; the insulation layer is provided with umbrella skirts, the insulation problem of a voltage of a semiconduction outer side can be ensured very well by the insulation layer, and meanwhile, the voltage problem of the whole bus terminal is ensured; and the umbrella skirts are used for extending the creepage distance of a high potential and a low potential very well, and the subsequent process of a bus due to the creepage distance problem is saved.

The invention discloses a truncated conical solid cylinder bearingless switched reluctance motor, which comprises a first stator and a rotor, a second stator and a rotor, a truncated conical solid cylinder; each tooth pole of the first and second stators There are first and second radial excitation windings on the top, these windings are independently controlled, and the axial excitation windings are connected in series on each tooth pole of the first and second stators; there is a conical outer chamfer on the axial inner side of the two stators Structure; the tooth poles of the first and second rotors have a 15° rotation mechanical angle difference; the first and second rotors share a rotating shaft with the truncated conical solid cylinder, and the outer chamfers of the truncated conical solid cylinder and the two stators There is an air gap length between them, when the first and second radial field windings conduct current, the first and second rotors provide radial levitation force, and at the same time the axial field windings conduct to control the magnetic flux in the stator teeth Density, so that the solid cylinder obtains a set of magnetic pulling force, and extracts the axial component of this set of magnetic pulling force to realize axial levitation control, and finally realizes five-degree-of-freedom levitation.

A magnetic particle inspection (MPI) apparatus is disclosed that includes a chordal field coil pair and a radial field coil pair. The chordal field coil pair includes first and second chordal field coils configured to produce a chordally oriented magnetic flux about a test article.

An axial excitation hybrid reluctance motor relates to an axial excitation hybrid reluctance motor with the functions of controlling and compensating the axial permanent magnet magnetic potential. It includes stator core, radial excitation winding, rotor core and permanent magnet. In the present invention, the magnetization direction of the permanent magnet is coaxial with the rotor core, and an axial excitation compensation control winding core and an axial excitation compensation control winding Winding, two axial excitation compensation control winding iron cores are respectively arranged on both sides of the rotor core in the axial direction, there is an axial air gap between the axial excitation compensation control winding iron core and the rotor iron core, and the axial excitation compensation control winding Installed on the iron core of the axial excitation compensation control winding, the axial excitation compensation control winding generates a magnetic field in the same direction as the rotor axis. The invention obtains the compensation and controllability of the magnetic potential of the permanent magnet by rationally designing and constructing the magnetic system, and at the same time can effectively use the space of the motor, thereby obtaining large torque and good control characteristics under the premise of the same structural size .

A Method and Apparatus to Control an Armature Rotating within a Magnetic Circuit have been disclosed. A rotatable radial field control is positioned between permanent magnets on a rotatable armature that is positioned within a stator. The rotatable radial field control rotation controls the rotation of the armature.

The invention relates to a radio frequency plasma chamber meeting the mechanism that negative hydrogen ions are generated through plasmas and belongs to the field of neutral beam heating in the controlled magnetic confinement nuclear fusion auxiliary heating technology. According to the radio frequency plasma chamber, the upper end of a discharging source region chamber is connected with a first air inlet and a preionization electrode flange in a sealing mode, and the lower end of the discharging source region chamber is fixedly sealed in the middle of a sealing cover at the upper portion of a diffusion chamber; the sealing cover at the upper portion of the diffusion chamber is provided with a second air inlet, and the lower end of the diffusion chamber is fixedly sealed to a bottom plate. A discharging coil is wound in the middle of the outer side of the discharging source region chamber, and the upper end and the lower end of the discharging coil are each provided with a first magnetic field coil; a second magnetic field coil generating a radial field is arranged at the bottom of the diffusion chamber. Through the radio frequency plasma chamber, the top of the diffusion chamber can be supplemented with fresh hydrogen; after the hydrogen collides with high-energy electrons diffused down from a source region, the density of excited vibrational-state hydrogen molecules in the plasmas in the diffusion region is increased, the electron temperature is decreased, and the probability that the negative hydrogen ions are generated in the plasmas is increased.

The invention provides a multi-blade collimator, which comprises a first blade mechanism and a second blade mechanism installed on a main frame along a first direction, wherein the first blade mechanism includes a plurality of blades for forming a first radial field; a second blade mechanism includes a plurality of blades for forming a second radial field; the first blade mechanism rotates around a second axial direction; and at least parts of the projections of the first radial field and the second radial field overlap along the second axial direction. In the technical scheme above, the overlapped part, of the first radial field and the second radial field along the second axial direction, is the final radial field of the multi-blade collimator. The first blade mechanism can rotate around the second axial direction to allow the multi-blade collimator to adjust the shape of the overlapped part of the first radial field and the second radial field according to the shape required by a radiated part and through adjusting a rotation angle of the first blade mechanism. Therefore, the radial structure finally formed of the multi-blade collimator is adjusted, so that an adaptive shape degree of the radial filed of the multi-blade collimator is improved.

The application relates to the technical field of medical imaging, and discloses a magnetic resonance imaging spiral acquisition method, device, equipment and storage medium, the method comprising the following steps: acquiring a long side and a short side of a rectangular field of view; determining a radial field of view and a circumferential field of view of spiral acquisition based on the long side and the short side of the rectangular field of view; the product of the radial field of view and the circumferential field of view is equal to the product of the long side and the short side of the rectangular field of view; determining a radial sampling interval and a circumferential sampling interval that satisfy the Nyquist sampling law based on the radial field of view and the circumferential field of view; determining a magnetic field gradient function based on a preselected K-space trajectory function, the radial sampling interval and the circumferential sampling interval, a maximum gradient amplitude limit and a maximum gradient change rate limit; exciting a magnetic resonance signal in an imaging region based on the magnetic field gradient function, and acquiring the magnetic resonance signal. The spiral trajectory design scheme provided by the application can be applied to the acquisition density requirement of the rectangular field of view.

The present invention relates to a system (100) for detecting a torsional load (T) acting on a torque-transmitting component (110), comprising a component (110) with a section (120) made of magnetizable material in which at least two circumferentially extending magnetic strips (121, 123, 125) with mutually opposing magnetization directions (122, 124, 126) are arranged successively in an axial direction (111) of the component (110), a first sensor unit (2) with two sensors (20, 22) associated with a first magnetic strip (123) for detecting a radial field component (6) and a second sensor unit (3) with two sensors (30, 32) associated with a second magnetic strip (121, 125) for detecting a radial field component (6); it further relates to a corresponding method.