137 results about "Magnetic pressure" patented technology

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

The invention discloses a high-efficient permanent magnet gathering type guide rail mechanism suitable for a high-temperature superconductive maglev system. The guide rail mechanism comprises a permanent magnet contraposition combination formed by a plurality of permanent magnets and a permanent magnet guiding combination formed by a plurality of permanent magnets. The guide rail mechanism is characterized in that the permanent magnet contraposition combination produces high magnetic pressure by utilizing mutual repulsion effect among poles of various permanent magnets, the permanent magnet guiding combination guides and diffuses magnetic energy of the permanent magnet contraposition combination and the permanent magnet guiding combination to an upper surface and an upper area of a permanent magnet guide rail for the using of high-temperature superconductive bulks by utilizing magnetization directivity of the permanent magnets. By the aid of the high-efficient permanent magnet gathering type guide rail mechanism, a shortage of low magnetic energy utilization efficiency caused by using ferromagnetic materials to guide magnetic path by an existing permanent magnet guide rail mechanism for the high-temperature superconductive maglev system is overcome, on the basis of magnetic field indexes guaranteed to meet the requirements of the maglev system, utilization efficiency of energy storage of the permanent magnet guide rail can be effectively improved, and meanwhile, the high-efficient permanent magnet gathering type guide rail mechanism is favorable for enhancing the overall performance of the high-temperature superconductive maglev system from aspects of magnetic field construction and magnetic energy distribution.

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.

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.

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.