389 results about "Magnetic orientation" patented technology

A magnetic alignment system can include a primary annular magnetic alignment component and a secondary annular magnetic alignment component. The primary alignment component can include an inner annular region having a first magnetic orientation, an outer annular region having a second magnetic orientation opposite to the first magnetic orientation, and a non-magnetized central annular region disposed between the primary inner annular region and the primary outer annular region. The secondary alignment component can have a magnetic orientation with a radial component. Additional features, such as a rotational magnetic alignment component and / or an NFC coil and circuitry can be included.

The invention relates to the technical field of power transmission and distribution switches, and discloses a vacuum bypass switch, which comprises an insulating shell, a static end copper bar, a movable end copper bar, a vacuum switch tube, an insulator, a pull rod and a permanent magnetic mechanism, the pull rod is driven by a magnetic field generated by the permanent magnet assembly to drive the moving end copper bar to move in the direction away from the vacuum switch tube so as to realize opening. The first coil and / or the second coil generate / generates a target magnetic field opposite to the magnetic field generated by the permanent magnet assembly in direction under the power-on effect so as to drive the pull rod to drive the movable end copper bar to move towards the vacuum switch tube, and closing is achieved. Closing is achieved through the first coil and / or the second coil, the problem that closing cannot be achieved due to single-coil faults is avoided, and the problem of thermal runaway caused by continuous energization of the single coil is solved. The invention also discloses a bypass switch control system, which controls the energization of the first coil and the second coil through the first energizing loop and the second energizing loop respectively to ensure the reliable closing of the vacuum bypass switch.

A magnetic alignment system can include a primary annular magnetic alignment component and a secondary annular magnetic alignment component. The primary alignment component can include an inner annular region having a first magnetic orientation, an outer annular region having a second magnetic orientation opposite to the first magnetic orientation, and a non-magnetized central annular region disposed between the primary inner annular region and the primary outer annular region. The secondary alignment component can have a magnetic orientation with a radial component. Additional features, such as a rotational magnetic alignment component and / or an NFC coil and circuitry can be included.

The invention provides a geomagnetic compensation and bias magnetic field generation system and method for cold atom interference. The system comprises a triaxial magnetometer, a triaxial Helmholtz coil, a voltage-controlled current source and an FPGA regulation and control module. The three-axis magnetometer is used for collecting space magnetic field data at a plurality of monitoring positions in the space where the three-axis Helmholtz coil is located in real time; the FPGA regulation and control module is used for calculating control voltage data required by the voltage-controlled current source according to a target magnetic field and any space magnetic field data collected by the three-axis magnetometer in each sampling period, controlling coil current transmitted to the three-axis Helmholtz coil, and outputting the coil current to the three-axis Helmholtz coil. And loop iteration is carried out until the three-axis Helmholtz coil generates a target magnetic field at a plurality of monitoring positions, wherein the target magnetic field is a near-zero magnetic field in the X / Y direction, and the magnetic field intensity in the Z direction is constant and is a non-zero value. The device can respond to the change of the environmental magnetic field in real time, and provides a stable and accurate magnetic field environment for the cold atom interference test on the basis of compensating the influence brought by the geomagnetic field.

A first winding is wound around a first middle column of a first magnetic core, and a second winding is wound around a second middle column of a second magnetic core. The third magnetic core is located between the first winding and the second winding, the third magnetic core has a through hole, and both the first middle column and the second middle column extend into the through hole. When a direction of a magnetic field generated by the first winding is the same as a direction of a magnetic field generated the second winding, the first magnetic core and the second magnetic core generate common-mode inductance. When a direction of a magnetic field generated by a third winding is opposite to a direction of a magnetic field generated a fourth winding, the third magnetic core generates differential-mode inductance.

This invention discloses a passive shimming method based on the displacement of a shimming plate, comprising the following steps: determining a set of shimming plate distribution information using a passive shimming method, including the initial installation position of the shimming plate, the spatial dimensions of the shimming plate, and the shimming plate itself; after installing the shimming plate, measuring the magnetic field distribution information on the surface of the target area, including the magnetic field values ​​of the main magnetic field direction components and the spatial position information of the measurement points; based on the shimming plate distribution information and the magnetic field distribution information, establishing an optimization problem, including a weighted objective function for magnetic field deviation and the total displacement of the shimming plate, and constraints determined based on magnetic field uniformity and the maximum displacement of the shimming plate; solving the optimization problem to obtain the displacement of the shimming plate, and operating the target shimming plate based on the displacement. This invention effectively compensates for shimming errors through the displacement of the shimming plate, avoiding excessive use of the shimming plate during the shimming iteration process.

The invention provides a permanent magnet magnetizing control method based on magnetic domain dynamics and a magnetizer, and particularly relates to the technical field of permanent magnet magnetizing. Obtaining a three-dimensional model of the permanent magnet to be magnetized, and dividing the three-dimensional model into a plurality of magnetic domain units; obtaining a magnetic moment kinetic equation of each magnetic domain unit; magnetic moment directions of the magnetic domain units are randomly distributed when magnetizing is not carried out, the magnetic moments of the magnetic domains do spin precession under the action of an effective magnetic field, and the magnetic moment directions approach to the direction of the effective magnetic field; the magnetic moment direction of each magnetic domain unit at different moments is subjected to numerical solution, and the change track of the magnetic moment direction of the magnetic domain unit from the initial magnetic moment direction is determined according to the instantaneous magnetic moment direction of the magnetic domain unit at different moments; and determining the consistency degree of the magnetic moment direction of each magnetic domain unit according to the change track, and generating a relation graph of the magnetizing saturation, the pulse magnetic field intensity and the pulse duration. According to the method, the magnetizing precision and efficiency can be improved.

The invention belongs to the technical field of electronic information, and discloses a millimeter wave magnetic coupling variable resonant equalizer, which comprises a transmission waveguide channel, a coupling channel and a resonant cavity which are communicated, the resonant cavity and the coupling channel are arranged in the narrow side direction of the transmission waveguide channel, the opening direction of the coupling channel is parallel to the direction component of an electric field, and the opening direction of the coupling channel is parallel to the direction component of the electric field. The inner walls of the two ends of the resonant cavity are adjustably and slidably connected with adjusting blocks, the opposite inner side faces of the two adjusting blocks are fixedly connected with wave absorbing materials, and the inner wall, facing the coupling channel, of the resonant cavity is detachably and movably connected with a guide block. The center position of the resonant cavity is provided with a telescopic tuning pin perpendicular to the direction component of the magnetic field. According to the structure, the processing and installation problems of a common waveguide equalizer are effectively solved, the equalizer is debugged more simply and quickly, meanwhile, the standing-wave ratio is optimized by changing the cavity structure, and a relatively complex gain curve can be equalized through the good frequency response characteristic.

The invention belongs to the field of magnetic materials. The invention provides a preparation method of a rare earth permanent magnet, which comprises the following steps: weighing rare earth magnetic powder, adding a binder solution, uniformly mixing, and drying until a solvent is completely volatilized to obtain bonded magnetic powder; the bonded magnetic powder is placed in a die cavity of a constant-temperature die for heat preservation and preheating; an inner cavity of the constant-temperature mold is vacuumized to form a vacuum environment, and gas adhering to gaps of the magnetic powder is exhausted; applying a magnetic field to the mold, forming an oriented magnetic field in the mold cavity, arranging easy magnetization axes of the magnetic powder along the direction of the oriented magnetic field, and applying pressing force to obtain a mold pressing blank; and heating and curing the molded green body to obtain the rare earth permanent magnet. The rare earth permanent magnet prepared through the preparation method has high compactness, the residual magnetism and the maximum magnetic energy product capacity of the permanent magnet are improved, rare earth magnetic powder is prevented from being oxidized, and the coercive force of the permanent magnet is remarkably improved.

The invention discloses a high-temperature pipeline magnetostrictive guided wave sensor and a monitoring method, and relates to the field of ultrasonic nondestructive testing. According to the sensor, a wrinkled iron-cobalt alloy belt is used as a sensitive element, and the sensor is in dry coupling contact with a to-be-detected pipeline; the high-temperature-resistant static magnetic field coil is wound on the outer side of the aluminum pre-tightening ring in a solenoid mode, and a bias pulse excitation mode is adopted. Alternately winding the bottom end of the wrinkle structure of the wrinkle-type ferrocobalt alloy belt and the back surface of the belt material, controlling the wrinkle-type ferrocobalt alloy belt to excite a guided wave signal in a pulse section, and receiving the guided wave signal in a bias section; the dynamic magnetic field and the static magnetic field generated by the two groups of coils are perpendicular in direction, and torsional mode guided waves are generated in the high-temperature pipeline based on the reverse Weidmann effect. The sensor is easy to install and stable in performance, the whole structure is resistant to high temperature for a long time, and the engineering problem of high-temperature failure is solved. The method provided by the invention comprises the steps of optimizing pre-tightening force, pulse voltage and bias current parameters, so that the transduction efficiency is improved, and the capability of detecting new defects of the pipeline in high-temperature and variable-temperature states is enhanced.

The invention discloses a vector magnetic field measurement method based on extended Kalman filtering, and the method comprises the following steps: 1, building a model: building a nonlinear system evolution model and a detection model in an atomic magnetometer; and step 2, establishing an extended Kalman filter to estimate the magnetic field vector. The accuracy of a traditional vector detection scheme depends on a mathematical model for extracting a magnetic field direction from an experimental signal to a great extent, meanwhile, a bias field with very high size and direction accuracy is also needed, and time and labor are consumed. According to the method, the defect that the original atom magnetometer vector magnetic field estimation needs to additionally set a bias magnetic field is overcome, so that the vector information of the magnetic field is more accurately obtained.

The invention provides an embedded rotor which comprises a first permanent magnet which is configured to be a cylinder, is integrally formed and is provided with a plurality of interval grooves in the circumferential direction, and the first permanent magnet is divided into a plurality of first permanent magnet sub-parts by the interval grooves; the second permanent magnets are arranged in the interval grooves; wherein the interval groove is used for accommodating the magnetic field applying device in the orienting and magnetizing process, so that the first permanent magnet obtains permanent magnetism; wherein the first permanent magnet sub-parts have magnetic field directions extending in the radial direction, and the first permanent magnet sub-parts on the two sides of the interval grooves have opposite magnetic field directions; the magnetic field direction of the second permanent magnet extends in the circumferential direction. And the magnetic fields of the second permanent magnets in the interval grooves and the magnetic fields of the first permanent magnets on the two sides of the interval grooves form a continuous magnetic circuit with the shortest path. The invention further relates to an electric machine comprising the in-cell rotor and to a method for producing the in-cell rotor.

The application discloses a method for preparing a metal organic framework film by magnetic field induction regulation control. The method comprises the following steps: vertically immersing a sheet carrier into a film forming solution of the metal organic framework film; placing a container provided with the film forming solution and the carrier into a uniform magnetic field; and standing for 4-24 hours to obtain the metal organic framework film prepared by the magnetic field induction regulation control. The metal organic framework film is a cobalt-based, nickel-based or iron-based metal organic framework film. The carrier material comprises alumina, porous carbon and porous organic material. The magnetic field direction is perpendicular to or parallel to the surface of the carrier. The metal organic framework film prepared by the application has excellent gas separation performance, and the film forming process is simple, convenient, easy to enlarge and popularize.

The invention discloses an ultrafast terahertz response magnetic field measurement method and system based on a linear magneto-optical conversion material, and the method comprises the steps: preparing a linear magneto-optical conversion heterojunction film which comprises at least one signal generation layer with a linear magneto-optical conversion characteristic and at least one signal emission layer with a strong spin-orbit coupling effect; placing the heterojunction thin film at the position of a magnetic field to be measured, and irradiating the heterojunction thin film by using femtosecond laser pumping pulse so as to enable the heterojunction thin film to radiate a terahertz signal; through the terahertz vector detection and rotation detection system, the positive and negative and the magnitude of terahertz signals radiated by the heterojunction film in three groups of orthogonal directions are detected, and the magnetic field direction and the magnitude of the magnetic field position to be detected are calculated based on the three groups of terahertz signals. The sensor has the advantages of being high in sensitivity, high in response speed, non-contact and the like, can achieve rapid detection of various vector magnetic fields such as stable, periodic modulation and sub-picosecond transient pulse, and has hundred-nanometer-scale spatial resolution capacity.

The invention discloses a dry type reactor turn-to-turn short circuit fault positioning method based on a magnetic field direction angle. Obtaining radial and axial magnetic field component data of an outer side designated area under different working conditions; dividing a measurement area according to a reactor structure and magnetic field distribution characteristics; screening optimal measurement areas under different working conditions based on the divided measurement areas and initial moment magnetic field components in the obtained radial and axial magnetic field component data; calculating a magnetic field direction angle of the optimal measurement area under different screened working conditions; making a sensor layout scheme according to the calculated magnetic field direction angles of the optimal measurement area under different working conditions and the change characteristics of the magnetic field direction angles of the measurement points under different working conditions, and determining each measurement point; fault positioning is realized by analyzing the magnetic field direction angle difference between the short-circuit working condition and the normal working condition of each measuring point. According to the method, the problems of insensitive response to the turn-to-turn short circuit fault of the inner layer encapsulation and low positioning precision of a traditional method are solved, and a high-reliability technical scheme is provided for fault detection of the dry-type air-core reactor.

The invention provides a self-excited cesium optical pump atomic magnetometer and a magnetic field measurement method. The magnetometer comprises a physical probe part and a circuit part. The physical probe part comprises a cesium spectrum lamp, an optical element, a cesium atom absorption gas chamber, a radio frequency coil and a photoelectric detector; the circuit part comprises a photoelectric conversion circuit, a phase-locked amplification circuit and a radio frequency excitation circuit modulated by square waves. A macroscopic magnetic moment is generated by pumping cesium atoms through left-handed circularly polarized light, a radio frequency magnetic field induces Larmor precession, light intensity changes are detected and fed back to a radio frequency coil to form self-oscillation, and the external magnetic field intensity is calculated according to the linear relation between oscillation frequency and the magnetic field. Square wave modulation is adopted to broaden the measurement bandwidth, a magnetic field direction adjusting system is additionally arranged to automatically keep an angle of 45 degrees between an optical axis and a magnetic field so as to eliminate a blind area, the hemisphere automatic switching function is achieved, and the advantages of being high in sensitivity, fast in response, high in adaptability, small in size and low in power consumption are achieved.

A radio-frequency module includes a module substrate, an inductor, and an acoustic wave filter. The inductor overlaps at least a portion of the acoustic wave filter when seen in a plan view from the normal direction of the module substrate. The inductor includes first and second coils connected in series. Each of the first and second coils is a spiral or helical coil that is wound with more than one turn. At least a portion of the first coil overlaps the second coil when seen in a plan view from the normal direction of the module substrate. A direction of a magnetic field generated by the first coil is opposite to a direction of a magnetic field generated by the second coil.

The invention discloses a light collimator based on magnetic particles and a manufacturing method thereof. The manufacturing method comprises the following steps: uniformly stirring and mixing the magnetic particles and a curing agent solution; adding an epoxy resin solution into the obtained mixed solution, and stirring until the magnetic particles are uniformly distributed; the obtained mixed solution is poured into a mold, the mold is placed in a uniform magnetic field with the magnetic field direction unchanged, the magnetic particles are arranged into a plurality of chain-shaped aggregates parallel to the magnetic field direction under the action of the magnetic field, and the chain-shaped aggregates are parallel to one another; and after the mixed solution in the mold is completely cured, removing the action of the magnetic field to prepare the optical collimator based on the magnetic particles. Therefore, the technical problems of complex manufacturing process, high cost and difficult maintenance of the light collimator in the prior art are solved.

The invention provides a quantum current sensor based on zero magnetic flux and a current detection method, and the sensor comprises a reverse magnetic field module which is used for generating a second magnetic field which is opposite to a first magnetic field in direction after a driving current is introduced, and the first magnetic field is generated by a to-be-detected current-carrying conductor; the auxiliary magnetic sensor and the solid-state spinning color center magnetometer are both located in a superimposed magnetic field of the first magnetic field and the second magnetic field and output a first measurement value and a second measurement value respectively; the feedback regulation module is used for providing driving current for the reverse magnetic field module, regulating and controlling the driving current according to the first measurement value until the magnetic field intensity value corresponding to the measured first measurement value is within the measuring range of the solid-state spin color center magnetometer, and regulating and controlling the driving current according to the second measurement value until the magnetic field intensity value corresponding to the measured first measurement value is within the measuring range of the solid-state spin color center magnetometer. The magnetic field intensity value corresponding to the measured second measurement value is zero; and the current calculation module is used for calculating the current value in the current-carrying conductor according to the driving current value. And high-precision measurement of wide-range current can be realized.

A memory device includes a spin-orbit-transfer (SOT) bottom electrode, an SOT ferromagnetic free layer, a first tunnel barrier layer, a spin-transfer-torque (STT) ferromagnetic free layer, a second tunnel barrier layer and a reference layer. The SOT ferromagnetic free layer is over the SOT bottom electrode. The SOT ferromagnetic free layer has a magnetic orientation switchable by the SOT bottom electrode using a spin Hall effect or Rashba effect. The first tunnel barrier layer is over the SOT ferromagnetic free layer. The STT ferromagnetic free layer is over the first tunnel barrier layer and has a magnetic orientation switchable using an STT effect. The second tunnel barrier layer is over the STT ferromagnetic free layer. The second tunnel barrier layer has a thickness different from a thickness of the first tunnel barrier layer. The reference layer is over the second tunnel barrier layer and has a fixed magnetic orientation.

The invention discloses a simple diamond NV color center four-axis measuring method and device, terminal equipment and a storage medium, and relates to the technical field of vector sensor sensitive axis space direction calibration, and the method comprises the steps: obtaining an ODMR spectrum of a to-be-measured diamond NV color center; adjusting the direction of the applied magnetic field, determining all the directions of the applied magnetic field perpendicular to the first axial direction of the NV color center of the to-be-measured diamond based on the formant condition in the ODMR spectrum, obtaining a first plane, and then determining the first axial direction; adjusting the direction of the external magnetic field in the first plane, and determining a second plane when the formant of the ODMR spectrum changes; adjusting the direction of the external magnetic field in a second plane, and determining a second axial direction when the formant of the ODMR spectrum changes again; and calculating a third axial direction and a fourth axial direction of the NV color center of the diamond to be measured according to the first axial direction and the second axial direction. By means of the method, the four axial directions of the NV color center of the diamond can be measured at a time.

The invention relates to the technical field of Penning ion sources, and discloses a Penning ion source kinetic simulation collision method, which comprises the following steps: carrying out integration on an ion distribution function of a current time step in a three-dimensional velocity space to obtain a first parameter, carrying out weighted integration on the first parameter and an axial velocity component in the ion distribution function to obtain a second parameter, according to the method, the overall numerical value collision term expression of the algorithm is simple, no differential operator or integral operator exists, only simple moment integral, exponential function operation and arithmetic operation are needed, but the transportation, perpendicular to the magnetic field direction, of ions brought by collision can be completely simulated, and compared with the prior art, the method has the advantages that the simulation efficiency is high; according to the method, a part of physical steps are omitted, a collision calculation algorithm is simplified, the calculation amount of simulation is reduced, the problems of numerical instability and divergence in simulation are solved, and the transportation process of ions in the direction perpendicular to the magnetic field can still be efficiently and accurately described.

The invention provides a vector magnetic field detection method based on a surface acoustic wave magnetic field directivity model, and the method employs an external magnetic field to act on a magnetic sensitive film on a sound propagation path to generate a dynamic magnetoelastic coupling effect, modulates the propagation characteristics of surface acoustic waves, and carries out the decoupling of a sound signal, and obtains the magnetic field information. The response value of the sensor is influenced by the included angle between the direction of the external magnetic field and the anisotropic axis, so that the angle orientation of the sensor in the space and the size and direction of the magnetic field can be quantitatively calibrated by projecting the magnetic field to be measured in the space into a coordinate system of the sensor, and a surface acoustic wave magnetic field directivity model is constructed. The surface acoustic wave magnetic field sensing technology has the advantages of high sensitivity, quick response and the like, and the vector magnetic field detection method can realize the direction positioning function of a full-plane magnetic field and has important practical value in the application field of space vector magnetic field detection.

The invention discloses a dry-type air-core reactor turn-to-turn short circuit fault detection method and system based on magnetic field direction angle change, and the method comprises the following steps: firstly, obtaining a plurality of operation conditions of a dry-type air-core reactor, including a normal operation condition and a turn-to-turn short circuit fault condition containing different short circuit positions; time sequence magnetic field vector data of a measurement point position is preset on the outer side; secondly, calculating a magnetic field direction angle of each measurement point according to the acquired data, and drawing a time sequence change curve of the magnetic field direction angle under a corresponding working condition; and finally, comparing the time sequence curves of the magnetic field direction angles of the measuring points under different working conditions, and judging whether a turn-to-turn short circuit fault occurs or not based on the deviation degree characteristics of the magnetic field direction angles of the turn-to-turn short circuit working condition and the normal operation working condition, thereby completing fault diagnosis. The weak magnetic field characteristic of turn-to-turn short circuit can be sensitively captured, the limitation of a traditional monitoring method is effectively overcome, and a powerful guarantee is provided for stable operation of the dry-type air-core reactor.

Disclosed herein is a system comprised of two components: a plurality of sensors and a controller. This plurality of sensors, which can be installed in a variety of locations, are capable of measuring parameters such as temperature, humidity, pressure, vibration, angle, vertical and horizontal magnetic orientation, inclination, and displacement and acceleration of displacement across coordinate axes. The controller is designed to read the data from these sensors and connect to other devices for control during crisis situations (like controlling elevators, gas and water outlets, etc.). The controller can autonomously manage conditions as needed. Furthermore, the controller, equipped with various ports like Bluetooth, Wi-Fi, and USB, can connect to a computer. The sensors, which are packaged in a coin-like form, can be embedded in concrete and other materials or connected adjacently. They can measure parameters and transmit them to the controller.

The invention provides a magnetic resonance guided charged particle beam radiotherapy device and an electromagnetic navigation parameter debugging method for target coordinates, and belongs to the technical field of radiotherapy devices. The system comprises a charged particle beam electromagnetic navigation device which comprises multiple stages of electromagnetic navigation coils, charged particle beams sequentially pass through the multiple stages of electromagnetic navigation coils, and parallel charged particle beams consistent with a magnetic resonance main magnetic field in direction are generated; the MR imaging device comprises an MR main magnetic field coil upper group and an MR main magnetic field coil lower group, and an imaging treatment area is formed between the MR main magnetic field coil upper group and the MR main magnetic field coil lower group. The electromagnetic navigation parameter debugging method comprises the steps of constructing a target cost function, optimizing electromagnetic navigation parameters based on an optimization algorithm without gradient information, and determining and outputting optimal navigation parameters. According to the invention, the charged particle beam parallel to the MR main magnetic field can be generated, the influence of Lorentz force on the charged particle beam is greatly reduced, the difficulty of positioning a tumor target region by the charged particle beam under the guidance of MR can be reduced, and the treatment accuracy is improved.

The utility model relates to an anti-coupling inductor and a power supply, the anti-coupling inductor comprises a magnetic core and a plurality of windings arranged in the magnetic core, the plurality of windings comprise a first winding and a second winding which are arranged at an interval, and the first winding and the second winding are mutually insulated; the first winding and the second winding are respectively bent and wound by a conductor to form a bent anti-coupling section; when current is connected to the first winding and the second winding, in the corresponding anti-coupling sections, the current directions are opposite, the magnetic field directions are opposite, and mutual offset is achieved, so that magnetic field anti-coupling is achieved. The coupling coefficient of the inductor is controlled by controlling the size and / or the position of the bent anti-coupling section; wherein after the winding, the end parts of the anti-coupling sections of the first winding and the second winding are arranged close to each other. By utilizing the physical structure of the double coupling windings, the current in the same direction is changed into the current in the opposite direction so as to achieve the effect of mutually counteracting magnetic fields, thereby reducing electromagnetic interference and improving the stability of the system.

This application relates to an ion cyclotron antenna device, including a controller; a detection component electrically connected to the controller, the detection component being used to detect the direction of the magnetic field in real time; a rotating device electrically connected to the controller; and an ion cyclotron antenna connected to the rotating device. When the direction of the magnetic field changes, causing the magnetic field direction to no longer be perpendicular to the ion cyclotron antenna, the detection component immediately feeds back a signal to the controller. The controller compares the relative positional relationship between the antenna and the magnetic field, and then outputs a command to the rotating device, enabling the rotating device to drive the ion cyclotron antenna to rotate and adjust, so that the ion cyclotron antenna is once again perpendicular to the direction of the magnetic field. Through the coordinated work of the detection component, the rotating device, and the controller, the relative perpendicularity between the ion cyclotron antenna and the direction of the magnetic field can always be guaranteed, thereby effectively suppressing the generation of parallel electric fields, reducing the generation of sheath potential, reducing the impact of high-energy particles on the antenna, and extending the steady-state operation time of the antenna and the nuclear fusion device.

To more easily heat an armature by induction heating.SOLUTION: A jig used when inductively heating a heated body by passing current through an induction coil, the jig is positioned between the induction coil and the heated body when viewed from the direction of current flow through the induction coil, the jig has a non-magnetized region and a magnetized region that can be magnetized by a magnetic field generated by passing current through the induction coil, the non-magnetized region is positioned on a straight line passing through the induction coil and the heated body when viewed from the direction of current flow, and the magnetized regions is provided on one side and the other side of the non-magnetized region in a direction along the magnetic field.SELECTED DRAWING: Figure 1

The invention discloses a magnetic generator based on magnetic bias current, and belongs to the technical field of generators, the magnetic generator comprises a casing, a rotating shaft and a stator, the rotating shaft is provided with a plurality of fan-shaped iron cores and fan-shaped permanent magnets, the fan-shaped iron cores and the fan-shaped permanent magnets are distributed on the rotating shaft along the circumference, the fan-shaped iron cores and the fan-shaped permanent magnets are symmetrically arranged, the fan-shaped iron cores are provided with armature windings, and the armature windings are arranged on the stator. The stator comprises four fan-shaped permanent magnets which are opposite in polarity and symmetrically distributed at the two ends of the machine shell, and the four fan-shaped permanent magnets form an axial magnetic pole pair. According to the technical scheme, the iron core and the permanent magnets are arranged in the rotor, the direction of the magnetic field of the permanent magnets is opposite to the direction of an induced magnetic field generated by an armature winding of the iron core, and the induced magnetic field hinders rotation of the rotor; meanwhile, magnetic circuit performance is optimized through magnetic biasing current, starting energy consumption is reduced, and efficient power generation is achieved through the synergistic effect of the permanent magnet and the induced magnetic field.