4028 results about "Magnetic poles" patented technology

A double cold rolled non-oriented electrical steel sheet having a composition including: 0.0001%≤Carbon≤0.007%, 0.1%≤Manganese≤0.2%, 3.1%≤Silicon≤3.6%, 0.8%≤Aluminum≤1.1%, Phosphorus≤0.15%, Sulfur≤0.006%, Nitrogen≤0.09%, and can contain various optional elements. The remainder composition being iron and unavoidable impurities caused by processing, the microstructure is made of ferrite and has in area fraction, 80% to 100% recrystallized microstructure, 0% to 20% non-recrystallized microstructure wherein the average grain size of recrystallized microstructure is from 20 microns to 110 microns and having a percentage of eddy current losses in total iron losses, measured at 1 T and 400 Hz according to IEC 60404-2 standards, is from 35% to 45% when calculated in accordance of Bertotti method and simultaneously having a magnetic polarization at 5000 A / m (J50) from 1.64 T to 1.66 T.

A double cold rolled non-oriented electrical steel sheet having a composition including, expressed in percentage by weight: 0.0001%≤Carbon≤0.007%, 0.15%≤Manganese≤0.3%, 3.2%≤Silicon≤3.8%, 0.8%≤Aluminum≤1.1%, Phosphorus≤0.15%, Sulfur≤0.006%, Nitrogen≤0.09%, and can contain various optional elements. The remainder composition being iron and unavoidable impurities caused by processing, the microstructure is made of ferrite and has in area fraction, 80% to 100% recrystallized microstructure, 0% to 20% non-recrystallized microstructure wherein the average grain size of recrystallized microstructure is from 20 microns to 110 microns and having a percentage of eddy current losses in total iron losses, measured at 1 T and 400 Hz according to IEC 60404-2 standards, less than 30% when calculated in accordance of Bertotti method and simultaneously having a magnetic polarization at 5000 A / m (J50) from 1.66 T to 1.69 T.

A non-oriented electrical steel sheet having a composition including of the following elements, expressed in percentage by weight: 0.0001%≤Carbon≤0.007%,, 0.15% ≤Manganese≤0.2%, 3%≤Silicon≤3.6%, 0.7%≤Aluminum≤1.3%, Phosphorus≤0.15%, Sulfur≤0.006%, Nitrogen≤0.09%, with 3.85%≤Si+Al+Mn ≤5.5%, and can contain various optional elements, the remainder composition being composed of iron and unavoidable impurities caused by processing, the microstructure of the steel sheet being made of ferrite and including in area fraction, 80% to 100% recrystallized microstructure, 0% to 20% non-recrystallized microstructure wherein the average grain size of recrystallized microstructure is from 20 microns to 110 microns and eddy current losses in total iron losses, measured at 1 T and 400 Hz according to IEC 60404-2 standards, of 35 to 55% when calculated in accordance with Bertotti method and simultaneously having a magnetic polarization at 5000 A / m (J50) from 1.635T to 1.670T.

A double cold rolled non-oriented electrical steel sheet having a composition including of the following elements, expressed in percentage by weight: 0.0001%≤Carbon≤0.007%, 0.1%≤Manganese≤0.3%, 3.1%≤Silicon≤3.8%, 0.6%≤Aluminum≤0.8%, Phosphorus≤0.15%, Sulfur≤0.006%, Nitrogen≤0.09%, and can contain various optional elements. The remainder composition is iron and unavoidable impurities caused by processing. The microstructure ferrite and has in area fraction, 80% to 100% recrystallized microstructure, 0% to 20% non-recrystallized microstructure wherein the average grain size of recrystallized microstructure is from 20 microns to 110 microns and having a percentage of eddy current losses in total iron losses, measured at 1 T and 400 Hz according to IEC 60404-2 standards, of 40 to 50% when calculated in accordance with Bertotti method and simultaneously having a magnetic polarization at 5000 A / m (J50) from 1.66T to 1.7T.

A non-oriented electrical steel sheet having a composition including of the following elements, expressed in percentage by weight: 0.0001%≤Carbon≤0.007%, 0.15%≤Manganese≤0.25%, 3.2%≤Silicon≤3.8%, 0.7%≤Aluminum≤1.3%, Phosphorus≤0.15%, Sulfur≤0.006%, Nitrogen≤0.09%, and various optional elements. The remainder composition is iron and unavoidable impurities caused by processing. The microstructure is ferrite and has in area fraction, 80% to 100% recrystallized microstructure, 0% to 20% non-recrystallized microstructure wherein the average grain size of recrystallized microstructure is from 20 microns to 110 microns and having a percentage of eddy current losses in total iron losses, measured at 1 T and 400 Hz according to IEC 60404-2 standards, less than 33% when calculated in accordance with Bertotti method and simultaneously having a magnetic polarization at 5000 A / m (J50) from 1.630T to 1.65T.

A non-oriented electrical steel sheet having a composition including of the following elements, expressed in percentage by weight: 0.0001%≤Carbon≤0.007%, 0.21%≤Manganese≤0.7%, 3%≤Silicon≤3.6%, 0.7%≤Aluminum≤1.3%, Phosphorus≤0.15%, Sulfur≤0.006%, Nitrogen≤0.09%, with 3.85%≤Si+Al+Mn≤5.5%, and can contain various optional elements. The remainder composition being composed of iron and unavoidable impurities. The microstructure is ferrite and has in area fraction, 80% to 100% recrystallized microstructure, 0% to 20% non-recrystallized microstructure wherein the average grain size of recrystallized microstructure is from 20 microns to 110 microns and having a percentage of eddy current losses in total iron losses, measured at 1 T and 400 Hz according to IEC 60404-2 standards, from 35% to 45% and simultaneously having a magnetic polarization at 5000 A / m (J50) from 1.63T to 1.66T.

The invention relates to the technical field of space electric propulsion, in particular to an ion thruster discharge chamber magnetic pole optimization method, which obtains an optimized discharge chamber magnetic pole structure by researching plasma generation and evolution behaviors under a specific magnetic pole structure based on a plasma numerical simulation process. On one hand, plasma characteristic parameters which cannot be tested by a test are obtained by using a numerical simulation means and a basic discharge principle of a discharge chamber, and on the other hand, change relationships between electron motion behaviors and the magnetic field intensity of a cathode magnetic pole and the magnetic field intensity of a conical section magnetic field are established; the working process and the working mechanism in the discharge chamber when the ion thruster works are understood more deeply, and data support and technical support are provided for optimization design of the discharge chamber of the ion thruster.

The permanent magnet type dual-drive electric vibration exciter comprises a magnetic circuit assembly and a moving coil assembly, the magnetic circuit assembly comprises a magnetic steel ring, an upper permanent magnet, a lower permanent magnet, a center magnetic pole and a bottom connecting plate, a first containing space and a second containing space are arranged in the magnetic steel ring, the upper permanent magnet is arranged in the first containing space, and the lower permanent magnet is arranged in the second containing space. The moving coil assembly comprises a moving coil framework, a first driving coil and a second driving coil, the first driving coil and the second driving coil are wound on the moving coil framework, the upper permanent magnet, the magnetic steel ring and the center magnetic pole form an upper magnetic field ring space, the first driving coil is located in the upper magnetic field ring space, and the second driving coil is located in the lower magnetic field ring space. The lower permanent magnet, the magnetic steel ring and the central magnetic pole form a lower magnetic field ring space, the second driving coil is located in the lower magnetic field ring space, the central magnetic pole is arranged in the magnetic steel ring, and the bottom connecting plate is arranged at the bottom of the lower magnetic steel ring; two independent magnetic field loops are established, a larger magnetic field is achieved, thrust is increased, the utilization rate of the magnetic field is improved, and higher vertical vibration precision and smaller transverse vibration are achieved.

The invention relates to a multi-pole magnetic field magnetizing test method and a spiral winding group thereof, and relates to the field of automatic magnetizing technology, and the method comprises the steps: constructing a test model, importing design parameters of a magnet to be tested, determining a multi-pole magnetic field distribution theoretical model, and defining a magnetic pole region and a key feature contour line; acquiring magnetic field data, scanning the surface of the magnetized magnet by using an array probe, and acquiring magnetic field intensity actual measurement data of a multi-dimensional coordinate; matching a magnetic pole contour, comparing an actually measured contour line with a theoretical contour line, and establishing sampling point mapping; correcting the deviation data, screening the deviation sampling points exceeding the threshold value, and determining magnetizing process adjustment parameters; and evaluating the magnetizing efficiency, carrying out iterative magnetizing based on the correction parameters, and generating an evaluation report containing indexes such as magnetic field uniformity and the like. The method has the effect of improving the magnetic field intensity and stability of the magnet during orientation magnetization.

A structure of a rotor changeable of a magnetic force is provided, which includes a rotor core and a plurality of magnetic pole parts disposed therein. Each magnetic pole part includes a radially-magnetized fixed magnetic-force magnet and a circumferentially-magnetized variable magnetic-force magnet. A cavity part is disposed between the fixed magnetic-force magnet and the variable magnetic-force magnet. The cavity part has a cross-section extending from an end part of the fixed magnetic-force magnet toward an opposing surface. The cavity part is formed so that a distance between the variable magnetic-force magnet and the cavity part in the circumferential direction becomes larger as the cavity part approaches the opposing surface, and a width of the cavity part in the circumferential direction becomes smaller as the cavity part separates from the fixed magnetic-force magnet in the radial direction.

The utility model discloses an ultrasonic composite magnetic field auxiliary polishing device, and belongs to the field of precision machining of curved surfaces of complex structures. The device comprises a six-axis precision machine tool, an electric spindle, an ultrasonic vibration device, a multi-magnetic-pole coupling polishing device, a workpiece, a connecting clamping device and an industrial control host, the electric spindle is clamped on an A-axis indexing table of the machine tool, the ultrasonic vibration device is installed at the tail end of the electric spindle, and the multi-magnetic-pole coupling polishing device is installed at the lower end of the ultrasonic vibration device through a connecting sleeve. According to the types of magnetic poles, the multi-magnetic-pole coupling polishing device is divided into a permanent magnetic pole polishing device, an electromagnetic pole polishing device and a mixed magnetic pole polishing device. The industrial control host controls all the modules to achieve cooperative movement, the multi-magnetic-pole coupling polishing device generates a coupling rotating magnetic field, the ultrasonic vibration device enhances relative movement between the surface of a workpiece and a polishing medium, and the polishing consistency and the machining quality of a complex structure curved surface are improved.

The invention discloses a method for accurately simulating temperature distribution of a cold pole coil in a subarea air of a hydro-generator, belongs to the technical field of hydro-generators, and aims to realize high-precision simulation of temperature distribution of a rotor coil by considering a complex multi-branch flow effect in a motor, change of loss density of the rotor coil along with position and temperature coupling and the like. The constructed three-dimensional model comprises the main characteristics of multi-branch flow formed by a magnet yoke annular gap, a stator air duct, a coil inner cooling air duct and the like, and can simulate the distribution of long and short turns, inner cooling holes and the like of a real rotor coil; the set flowing and heat exchange boundary conditions can simultaneously consider the coupling change of the rotor coil loss density along with the position and the temperature and the air flowing state of a dynamic and static connection area, and the method is realized in AnsysFluent or CFX software by utilizing a self-programming function or an Expression expression.

The invention provides an electro-permanent magnet uncoiling composite magnetic field multi-mode adjustment system which comprises a data acquisition and preprocessing module, a graph structure construction module, a dynamic prediction module, a historical matching prediction module, a magnetic force adjustment strategy module and an electro-permanent magnet execution mechanism. The data acquisition module constructs a multi-modal data cube through a temperature field, deformation, stress and magnesium powder concentration sensing network; the graph structure module discretizes the steel strip coil into a node network and calculates a mechanical association edge weight; the dynamic prediction module updates node features through the graph neural network and then outputs a sliding probability vector through the LSTM network; the historical matching module screens similar working conditions based on a dynamic time warping algorithm and generates magnetic force preset parameters; the strategy model fuses the probability vector and a preset parameter to generate a partition magnetic matrix; and the execution mechanism realizes millisecond-level magnetic field regulation and control through the reconfigurable magnetic pole array. According to the system, the magnetic field control precision can be improved, the interlayer sliding risk is reduced, and the self-adaptive adjustment effect is achieved.

The glass substrate cassette with the supporting cantilever provided with the permanent magnet vibration reduction piece comprises an upper frame and a lower frame which have corresponding transverse width and depth, and a plurality of left and right outer frame columns and rear frame columns which are supported between the upper frame and the lower frame to form a containing space; the left outer frame column and the right outer frame column respectively extend towards the containing space to be provided with a plurality of short supporting rods, the rear frame column is respectively provided with a plurality of supporting cantilevers in an extending mode, the supporting cantilevers are respectively provided with a fixed end and a free end, the free end is provided with a permanent magnet vibration reduction piece, and the permanent magnet vibration reduction piece is respectively provided with an upper magnetic pole and a lower magnetic pole. And the other permanent magnet vibration reduction piece is opposite to the free end of the vertically adjacent supporting cantilevers, so that when the free end deviates from a balance position to start vibration, the permanent magnet vibration reduction pieces can be synchronously driven, combined magnetic restoring force facing the balance position is obtained from the adjacent permanent magnet vibration reduction pieces on the upper side and the lower side, and the permanent magnet vibration reduction pieces return to the balance position more quickly.

The invention discloses a magnetofluid type silicon controlled rectifier radiator and a heat dissipation control method thereof. The radiator comprises a silicon controlled rectifier, a magnetic fluid chamber is attached to the outer side of the silicon controlled rectifier, the magnetic pole array is installed in the magnetic fluid chamber, and cooling fins are assembled outside the magnetic fluid chamber. When alternating current is introduced into the cavity where the magnetic fluid liquid chamber is located, the alternating current and the magnetic field interact to generate Lorentz force, the Lorentz force drives the magnetic fluid to form directional eddy current so as to achieve convective heat exchange on the silicon controlled rectifier, and heat absorbed by the magnetic fluid and air are subjected to heat exchange through the cooling fins. Junction temperature out-of-control caused by local hot spots of the silicon controlled rectifier can be solved, secondary damage of mechanical vibration of a heat dissipation system to welding spots is eliminated, and the highest junction temperature area of the silicon controlled rectifier is focused and cooled according to needs.

The invention relates to the technical field of underwater propulsion, and discloses an intelligent control method and system for an underwater magnetic coupling propeller. The method comprises the following steps: detecting a magnetic field of a magnetic coupling unit through a Hall sensor array to obtain magnetic flux density distribution data; permanent magnet array hysteresis characteristics are modeled according to the magnetic flux density distribution data, and hysteresis compensation parameters are obtained; inputting the hysteresis compensation parameter into a magnetic field genetic algorithm to optimize magnetic pole configuration to obtain an optimal magnetic pole phase difference; distributing a torque control instruction according to the optimal magnetic pole phase difference to obtain a target excitation current value; the magnetic field is adjusted through the hysteresis compensation PID controller, and magnetic coupling torque output is obtained. By establishing an intelligent control method of hysteresis characteristic accurate modeling, magnetic field genetic optimization and hysteresis compensation PID control, the control precision and transmission efficiency of the magnetic coupling propeller in a complex marine environment are improved.

The invention belongs to the technical field of particle accelerators, and discloses a nonlinear impact magnet based on a nanocrystalline magnetic material and a matched power supply system. The nonlinear impact magnet comprises a magnetic core and a magnet exciting coil assembly, the magnetic core comprises magnetic poles and a magnetic yoke; the magnetic pole and the magnet yoke are both of a fully-symmetrical annular structure, and the magnet yoke is arranged on the periphery of the magnetic pole. The magnetic pole comprises N same magnetic pole units, N is 4, 6 or 8, and the magnetic pole is made by laminating nanocrystalline strips; and the excitation coil assembly is wound outside each magnetic pole unit. Compared with a traditional silicon steel sheet or ferrite magnetic core, the magnet provided by the invention can improve the uniformity of a magnetic field, and the magnetic pole made of the nanocrystalline strip with ultrahigh magnetic conductivity and low coercive force has stronger magnetic field uniformity and low disturbance characteristic; and the design requirement of the STCF clash ring off-axis injection system for low disturbance of the circulating beam bunch can be better met.

The invention discloses a super-flat wire common-winding motor and a design method, and belongs to the technical field of motor design and manufacturing. The invention discloses an equal-pole common-winding axial magnetic flux motor and a design method, the equal-pole common-winding axial magnetic flux motor comprises a motor winding, a stator, a rotor, a casing and the like, and is characterized in that the number of magnetic poles of the stator and the number of magnetic poles of the rotor are equal, all the magnetic poles of the stator or the rotor on the same disc are excited through the same annular coil winding, and the winding can be a conventional round wire, a flat wire or a super-flat wire; alternatively, two or more concentric circle winding units, such as an outer ring winding unit and an inner ring winding unit, can be arranged on the same disc, radially adjacent iron cores can be shared or can also be independently arranged, meanwhile, the radial size of the shared iron core can be wider in consideration of the magnetic saturation problem, or the radial size of the shared iron core can be smaller in consideration of the magnetic saturation problem. The radial sizes of the iron core and the winding in the small-diameter area can be larger; the working principle can be a reluctance type, a switch reluctance type, a permanent magnet synchronous type, a direct-current motor type or an alternating-current motor type; the direct current motor can be a commutator or a plane commutator; or a brushless control scheme; the alternating current motor can be square wave, sine wave or other waveform; the phase difference of the three-phase alternating current can be 120 degrees; or two-phase or four-phase alternating current or other phase difference current with the phase difference of 90 degrees.

The invention discloses intelligent fruit picking and air transportation integrated equipment and an operation method thereof.The intelligent fruit picking and air transportation integrated equipment comprises three types of multifunctional mechanical arms, the tail ends of the picking mechanical arms are integrated with image recognition and clamping mechanisms, lossless picking of fruit stems is achieved through joint cooperation and preset clamping force control, and fruits are conveyed to a temporary storage box through a special conveying pipe; the placing mechanical arm integrates a clamping mechanism and an air suction head, and empty basket placing and fruit basket placing are integrated. The lifting appliance grabbing mechanical arm integrates multiple assemblies and completes multi-task grabbing of a lifting appliance, a full fruit basket and an empty fruit basket. A magnet pole controllable design is adopted to realize lossless grabbing and releasing of the lifting appliance, the unmanned aerial vehicle autonomously plans a path based on a position sensor A / B to cooperate with ground equipment, and the supporting platform can be rotatably folded to save space; in addition, an overhanging button and a sound-light alarm are arranged to guarantee man-machine safety, all links are linked to form a full-process automatic operation closed loop, and picking and transporting efficiency and operation flexibility are remarkably improved.

A fine-adjustable electromagnetic lens for a charged-particle optical apparatus comprises a magnetic circuit assembly including one or more ring magnets, and a sleeve insert of generally rotational symmetry around a longitudinal axis. The sleeve insert surrounds a passage opening extending along the longitudinal axis, and comprises several electrically conductive electrode elements configured to generate an electrostatic field within the passage opening. The ring magnets are arranged circumferentially around an inner yoke shell and surrounded by an outer yoke shell; the inner yoke shell in turn surrounds a central portion of the sleeve insert. The ring magnets are magnetized such that the two magnetic poles are oriented towards the inner and outer yoke shell, respectively. The inner and outer yoke shell together with the ring magnets form a magnetic circuit having at least one gap, in order to generate a magnetic field reaching inwards into the passage opening and spatially overlapping with the electrostatic field generated by the sleeve insert.

The invention discloses a motor, a compressor and refrigeration equipment, the motor comprises a stator assembly and a rotor assembly, the stator assembly comprises a plurality of stator punching sheets stacked in the axial direction, the rotor assembly is located at the radial inner side of the stator assembly, and the rotor assembly comprises a plurality of rotor punching sheets stacked in the axial direction. The rotor punching sheet is provided with a plurality of magnetic steel groove groups which are circumferentially arranged at intervals, each magnetic steel groove group is internally provided with magnetic steel with the same magnetic pole, the magnetic poles of the magnetic steel in two adjacent magnetic steel groove groups are opposite, and the radial outer side of each magnetic steel groove group is provided with a magnetic barrier group. And each groove is arranged between two adjacent magnetic steel groove groups, so that the distribution of a magnetic field is changed, the magnetic field is more uniform, the iron loss is reduced, the torque is improved, the stator saturation is relieved, the rotor magnetic field is fully utilized, harmonic waves are reduced, and the efficiency is further improved.

The invention discloses a hydro-generator magnetic pole cooling fin tool configuration method and system based on a graph neural network, and belongs to the technical field of hydro-generator assembly process intelligence. The problem of intelligent upgrading of hydro-generator magnetic pole cooling fin tool configuration is solved. The method comprises the following steps: data acquisition: acquiring surface temperature field distribution data, deformation parameter data and three-dimensional vibration spectrum data of the magnetic pole cooling fin, and microscopic morphology image data of a contact area of the magnetic pole cooling fin and a clamp; constructing a node feature vector of a topological graph structure comprising a magnetic pole cooling fin node, a clamp node and an environmental parameter node, and generating a topological graph comprising node features and edge weights by using a graph convolutional neural network; calculating fixture positioning probability distribution, and outputting an optimal tool combination scheme; and executing the physical assembly instruction to complete the configuration of the hydro-generator magnetic pole cooling fin tool. The configuration efficiency of the hydro-generator magnetic pole cooling fin tool is improved.

The application discloses a relay, which comprises static contact lead-out ends, a moving spring assembly, a push rod assembly, a first anti-rotation assembly and a second anti-rotation assembly. The moving spring assembly comprises a moving spring sheet, two ends of the moving spring sheet in a first direction are used for contacting or separating from a pair of static contact lead-out ends respectively; the first direction is the arrangement direction of the pair of static contact lead-out ends, and the movement direction of the moving spring sheet is defined as a second direction; the moving spring assembly has a first side surface and a second side surface which are oppositely arranged along a third direction perpendicular to the first direction and the second direction; the push rod assembly comprises a contact support with a first side wall and a second side wall which are oppositely arranged along the third direction; the first side wall corresponds to the first side surface, and the second side wall corresponds to the second side surface; the first anti-rotation assembly comprises a first magnet and a second magnet, and the same-pole magnetic poles of the first magnet and the second magnet face each other; and the second anti-rotation assembly comprises a third magnet and a fourth magnet, and the same-pole magnetic poles of the third magnet and the fourth magnet face each other.

The invention provides intelligent assembling equipment for a magnetic block magnetic pole clamping structure and a control method thereof, and the intelligent assembling equipment comprises a lifting platform module which is used for fixing a clamping base and can drive the clamping base to do lifting motion in the Z direction; the magnetic block pushing platform module is used for clamping the magnetic block to move in the X direction and the Y direction respectively and pushing the magnetic block into the corresponding mounting groove position of the clamping base; the magnetic pole tool assembly robot module is used for clamping a magnetic pole tool and assembling the magnetic pole tool in the clamping base; the magnetic pole assembling robot module is used for clamping a magnetic pole and assembling the magnetic pole in the installed magnetic pole tool; wherein the magnetic block pushing platform module is arranged to be capable of adjusting the horizontal angle of a clamped magnetic block in an XY plane. The cleaning requirement, the assembly precision and the automatic operation requirement under the ultrahigh vacuum environment are met, the consistency of the assembly precision and batch performance of the magnetic block magnetic pole clamping structure is promoted, and the yield and the production efficiency are remarkably improved.

The invention discloses an integrally sintered neodymium iron boron Halbach ring multi-pole rotating excitation magnetic field press which comprises a rack, a base, a die assembly, an upper die servo electric cylinder mechanism, a lower die servo electric cylinder mechanism, an excitation structure and a rotating excitation device. The base is fixedly arranged on the ground or a working platform; the rack is mounted above the base; the die assembly comprises an upper annular male die, a lower annular male die, a non-magnetic steel female die, a magnetic conductive die core and a die base. The excitation structure comprises an excitation frame, an excitation coil, an excitation pole and a magnetic conductive pole shoe; excitation forming of any even number of poles can be carried out by using a mold of the same size, the requirement for multiple pole numbers is met, the equipment investment is reduced, the production cost is reduced, the production period is shortened, the production flexibility and efficiency are improved, the diversified requirements of different clients and application scenes for the Halbach magnet ring are met, and the production efficiency is improved. The problems that an existing magnetic field press is single in forming pole number and uneven in surface magnetic field distribution are solved, and technical conversion and marketization are promoted.

The present invention relates to the technical field of encoders, and particularly to a high-performance magnetic ring encoder and a method for detecting the absolute angle of the magnetic ring encoder. The high-performance magnetic ring encoder includes a second multi-pole magnet, a first multi-pole magnet, a single-pole magnetic conductor assembly, a first group of Hall elements, a second group of Hall elements, and a third group of Hall elements; the single-pole magnetic conductor assembly has a toothed portion and a smooth portion, the first group of Hall elements and the second group of Hall elements are respectively arranged adjacent to the first multi-pole magnet and the second multi-pole magnet, the third group of Hall elements is arranged between the toothed portion and the smooth portion, and the three groups of Hall elements output corresponding detection signals according to the pole signals of the corresponding magnets. The present invention calibrates the rotation angle of the magnetic ring encoder by obtaining a mechanical angle with a certain accuracy, thereby greatly improving the measurement accuracy. The present invention is particularly suitable for meeting the actual requirements of angle detection of large-diameter shaft parts.

The invention discloses a radial two-degree-of-freedom hybrid magnetic bearing with external permanent magnets. The radial two-degree-of-freedom hybrid magnetic bearing comprises a stator and a rotor. The rotor comprises a rotor iron core, a rotating shaft, two rotor U-shaped grooves, two rotor magnetic isolation aluminum rings and two rotor permanent magnet rings, the stator comprises a stator iron core, a coil, two stator U-shaped grooves, two stator magnetic isolation aluminum rings and two stator permanent magnet rings, and the polarities of the stator and the rotor permanent magnet rings which are opposite up and down are opposite; the permanent magnet rings are respectively embedded into the corresponding U-shaped grooves and are arranged on two sides of the stator core and the rotor core through the magnetic isolation aluminum rings, eight magnetic poles are uniformly distributed in the stator core, eight coils are wound on the magnetic poles, the coils on two poles in the + X,-X, + Y and-Y directions are respectively and reversely connected in series to form suspension windings in the + X,-X, + Y and-Y directions, and then the suspension windings are driven by the four switch power amplifiers. The radial two-degree-of-freedom hybrid magnetic bearing provided by the invention has the advantages of no coupling of permanent magnetic flux and suspension magnetic flux, high suspension precision, low power consumption, easiness in processing and assembling and high suspension force density.

The invention discloses a method and a device for measuring the service life of magnetic poles in a normal-conducting high-speed magnetic levitation electromagnet, and relates to the field of magnetic levitation trains. And the service life evaluation coefficient is calculated by combining the initial magnetic pole parameters, so that the working condition of the suspension electromagnet can be evaluated more comprehensively and accurately, and the phenomenon of missed judgment caused by small damage area of an insulating layer is effectively avoided. The service life of the suspension electromagnet can be accurately evaluated, an operator can reasonably arrange maintenance and replacement plans of the suspension electromagnet by calculating the service life evaluation coefficient, maintenance or part replacement can be carried out at a proper time, excessive loss or sudden failure of the suspension electromagnet is avoided, the service life of the suspension electromagnet is prolonged, and the service life of the suspension electromagnet is prolonged. And the reliability and economical efficiency of the suspension electromagnet are improved.

The invention relates to the technical field of communication power connection, in particular to a magnetic coupling connector assembly for deep sea wet plugging, which comprises a socket component and a plug component, wireless power supply coils and communication modules are arranged at the front ends of the socket component and the plug component, and a first annular magnet array is arranged at the front end of the socket component. A second annular magnet array is arranged at the front end of the plug component, and magnetic poles at the same position of the first annular magnet array and the second annular magnet array are oppositely arranged; and a rotary locking mechanism is arranged between the socket component and the plug component and is used for realizing mechanical locking through relative rotation after the socket component and the plug component are magnetically adsorbed. By adopting the design that the annular multi-pole magnet array and the mechanical rotary locking mechanism cooperate with each other, magnetic force provides adsorption force during butt joint and is converted into locking force after locking, self-alignment and high-reliability locking in the butt joint process are completed, and the technical effect of environment interference resistance is achieved.

A motor according to an aspect of the present invention includes a rotor rotatable around a center axis and a stator located on one side of the rotor in an axial direction. The stator includes a plurality of magnetic poles facing an end surface of the rotor on the one side in the axial direction. The rotor includes a rotor body having an annular shape and including at least one magnet, a rotor frame including a plurality of arms extending in a radial direction, and a first cover fixed to the rotor frame. The at least one magnet has, at least in part or in whole, a magnetization direction in the axial direction. The plurality of arms are located on the other side of the rotor body in the axial direction. The first cover is configured to cover at least part of a surface of the at least one magnet, the surface facing the one side in the axial direction.