38 results about "Magnetic energy" patented technology

The invention discloses a magnetic-mechanical-electric coupling amplitude-change pole simulation method based on finite element analysis, and relates to the technical field of magnetoelectric antenna simulation. The magnetic-mechanical-electric coupling amplitude-change pole simulation method based on finite element analysis comprises the steps that parametric modeling is carried out, and a multi-physical field environment is imported; defining material attributes; solid mechanics, an electrostatic field and a magnetic field are coupled, and piezoelectric and piezomagnetic effects are started; dividing grids and configuring a solver; executing simulation calculation; and evaluating displacement and stress results and performing iterative optimization. According to the magnetic-mechanical-electric coupling amplitude-change pole simulation method based on finite element analysis, through multi-physics field coupling simulation, electric-mechanical-magnetic energy conversion is accurately simulated, the problem of traditional simulation distortion is solved, a high-performance amplitude-change pole capable of amplifying the amplitude of a permanent magnet sheet to 9 micrometers is guided to be designed, and the radiation capacity and reliability are remarkably improved.

This application belongs to the field of metal electromagnetic high-speed forming manufacturing technology, specifically disclosing a method and system for obtaining an electromagnetic forming actuator. The method includes: determining the basic structural parameters of the electromagnetic forming actuator with the goal of maximizing the magnetic energy utilization efficiency and the electromagnetic force impulse on the workpiece; obtaining the bottom morphology function of the electromagnetic forming actuator based on the electromagnetic forming force field requirements, and determining the parameters to be optimized and their value ranges in the bottom morphology function; determining a typical deformable workpiece configuration based on the workpiece deformation process and the target forming shape; calculating the weighted average of the magnetic field distribution uniformity index and magnetic energy efficiency of the electromagnetic forming actuator with different bottom morphology parameters on the typical deformable workpiece configuration; and selecting the optimal bottom morphology parameters based on a multi-objective optimization model with the goal of improving the magnetic field uniformity and magnetic energy efficiency. This application fundamentally solves the problem of uneven electromagnetic force caused by the structure of the electromagnetic forming actuator.

The invention discloses a permanent magnet-magnetizer magnetic control type electric kinetic energy synchronous output device, relates to the crossing field of permanent magnet power and power generation equipment, and discloses the permanent magnet-magnetizer magnetic control type electric kinetic energy synchronous output device to overcome the defects that an existing device is low in magnetic energy utilization rate and single in function and depends on external energy. The device forms a'starting-regulating-driving-power generating-self-sufficiency 'closed-loop system through the supporting system, the core energy conversion system and other four units. The core unit adopts a neodymium iron boron N52 permanent magnet and a high magnetizer, and the air gap is 0.4-1.5 mm; the intelligent regulation and control system realizes millisecond-level switching of magnetic field polarity through a Hall sensor and a driving module; the power generation coil and the power coil are complementary in magnetic field, and the characteristics of load increasing and torque synchronous increasing are achieved. The magnetic energy conversion efficiency of the device reaches 88%, the service life exceeds 150000 hours, the device is completely separated from external energy after initial starting, and the device can be applied to the fields of industry, aerospace and the like through power expansion.

The present application relates to the technical field of magnetic element modeling and control, and particularly relates to a multi-factor magnetic core loss prediction method based on machine learning. The method first acquires the magnetic flux density data of the magnetic element, extracts its distribution characteristics and shape characteristics, and realizes excitation waveform recognition by constructing a classification model; secondly, a temperature index correction term is introduced based on the Steinmetz equation to establish a temperature-sensitive loss model; further, the entropy weight method and statistical analysis are used to evaluate the importance of multiple factors; an integrated learning model of random forest and LightGBM is used to construct a magnetic core loss prediction model; and a single-objective optimization model is established by combining differential evolution and simulated annealing algorithm with the objectives of minimum loss and maximum magnetic energy transmission. The method improves the generalization ability and prediction accuracy of the model, can adapt to the modeling needs of magnetic core loss under multiple material, multiple waveform and multiple working condition conditions, and is suitable for application scenarios such as high-frequency magnetic element design and power electronic system optimization.

A device for providing a magnetic treatment by evoking muscle contraction by a time-varying magnetic field and providing a RF treatment by heating biological structure. The device includes an applicator having an RF electrode and a magnetic field generating device. The device may also include a main unit, a human machine interface, and a control unit. The control unit adjusts a signal provided to the RF electrode and creates an RF circuit, and also adjusts the signal provided to the magnetic field generating device and creates a magnetic circuit electrically insulated from the RF circuit. The RF circuit may include a power source and a power amplifier, and the magnetic circuit may include an energy storage to supply the magnetic field generating device with electric current.

When the distance between the magnetic slider and the fixed magnetic pole block in the first and second magnetic energy storage components of the laser direct-write imaging device provided in this application is compressed, the magnetic slider promotes the acceleration or deceleration of the scanning component under the action of the magnetic force applied by the fixed magnetic pole block. The first and second magnetic energy storage components can convert the kinetic energy of the scanning component during the deceleration phase into potential energy, and then release the potential energy during the reverse movement to accelerate the scanning component in the opposite direction. This improves the scanning speed of the emitted light array without changing the motor power and the weight of the device itself, thereby improving the production efficiency of the laser direct-write imaging device. Secondly, the laser direct-write imaging device in this application uses the force between the non-directly connected magnetic slider and the fixed magnetic pole to promote the acceleration or deceleration of the scanning component, avoiding mechanical vibration caused by direct contact and improving the stability of the laser direct-write imaging device.

The utility model provides a wireless power supply vacuum cup, which relates to the field of wireless power supply, and is characterized in that a nanocrystalline layer, a first ferrite and an electromagnetic induction receiving coil are sequentially overlaid at the bottom of a vacuum cup body, so that the vacuum cup as a power supply object of a power supply base can effectively restrain and concentrate an alternating magnetic field generated by a transmitting coil of the power supply base; loss of magnetic energy in the transmission process is reduced, and efficient interception and conversion of the receiving coil to the magnetic field are achieved; wherein the nanocrystalline layer inhibits ineffective divergence of a magnetic field by virtue of the property of high magnetic conductivity of nanocrystalline, so that the magnetic field of the coil is more focused, and loss in an electromagnetic conversion process is reduced; and the first ferrite forms magnetic circuit shielding on the back surface of the receiving coil, so that eddy-current loss generated by the cup body of the vacuum cup is reduced, the overall coupling efficiency is improved, the loss in the electromagnetic conversion process is further reduced, and the energy use efficiency of the wireless power supply vacuum cup is improved.

1. Name of the design product: inductor. 2. Use of the design product: electronic component for converting electric energy into magnetic energy and storing magnetic energy. 3. Design points of the design product: in shape. 4. Picture or photo best indicating the design points: perspective view 1. 5. The right view is the same as the left view, and the right view is omitted.

The invention relates to the technical field of heat treatment of welding seams, and discloses an electric-magnetic coupling energy field time-sharing loading type circumferential welding seam strengthening process and device, and the process comprises the following steps: (1) welding seam positioning; (2) tool positioning; (3) high-frequency large-current treatment; (4) coupling treatment of medium and low frequency strong electric pulse-strong alternating magnetic field; (5) low-frequency medium-strong electric pulse-medium-strong alternating magnetic field coupling treatment; and (6) the tool is unloaded. According to the method, a multi-stage multi-directional magnetic field and a wide-frequency-domain controllable pulse current field are actively constructed, the space-time action domain of an electric-magnetic energy field is accurately matched, micro defects and solute atoms are driven to directionally migrate and evolve, precipitated phase size distribution is regulated and controlled in a targeted mode, local obdurability and heat-conducting property of a non-uniform body of a welded workpiece are cooperatively improved, and the welding quality is improved. The method has the characteristics of high flexibility, high efficiency, short process, high space-time integration in the manufacturing process and the like.

The invention relates to the technical field of thermal diffusion pumps, in particular to a thermal diffusion pump heating structure and a diffusion pump, and the thermal diffusion pump heating structure comprises a controller which is used for converting alternating current into superaudio current; the heating coil is connected with the controller and used for converting the ultrasonic frequency current into a magnetic field; the vortex plate is connected with the diffusion pump and used for converting the magnetic energy into heat energy to heat an oil pan at the bottom of the diffusion pump. According to the electromagnetic induction principle, the controller is used for generating ultrasonic frequency current to drive the heating coil to generate a high-speed alternating magnetic field, so that heat is directly and quickly generated in the vortex plate due to the vortex effect, and the vortex heat effect is generated in the extremely thin skin depth of the surface of the vortex plate, so that the thermal inertia is extremely small; and the system can quickly start heating.

The invention discloses a low-field permanent magnet type MRI magnetic circuit design method and a magnet system thereof, and belongs to the technical field of magnetic resonance imaging. A sintered neodymium-iron-boron magnet with a high magnetic energy product and a sintered samarium-cobalt magnet with an excellent temperature characteristic are utilized to form the annular hybrid magnetic pole disc, the sintered samarium-cobalt magnet is located in the center area of the hybrid magnetic pole disc, and the sintered neodymium-iron-boron magnet is located in the edge area of the hybrid magnetic pole disc. And finally, the low-field MRI magnet system with light weight and excellent uniformity and temperature stability of the magnetic field is realized. The total weight of the magnet system is less than 400kg, and the central magnetic field intensity of the magnet system reaches 0.07 T; meanwhile, in a sphere space with the diameter of 200 mm and with the center of the magnet system as the sphere center, the magnetic field non-uniformity at the boundary is smaller than 100 ppm, and the fluctuation of the magnetic field non-uniformity at the boundary along with the temperature is also smaller than 100 ppm / DEG C.

The present disclosure relates to a sintered neodymium-iron-boron magnet and a method for preparing the same, the magnet comprising a main phase and a grain boundary phase, a ratio of an average grain size of a surface layer of the magnet to an average grain size of a central region of the magnet being 1.05-1.35; wherein the surface layer of the magnet refers to a region at a distance of 35 μm or less from a surface of the magnet; and the central region of the magnet refers to a region at a distance of 500 μm or more from the surface of the magnet. The sintered neodymium-iron-boron magnet has a sum of a maximum magnetic energy product (BH)max and an intrinsic coercivity HcJ of greater than 80; and a remanence Br of greater than 13 KGs; the maximum magnetic energy product (BH)max has a unit of MGOe, and the intrinsic coercivity HcJ has a unit of KOe.

The invention relates to a bidirectional carrier rocket launching and recycling device based on ground-rocket magnetic field coupling, a launching method and a recycling method, and belongs to the field of aerospace ground support equipment. Comprising an integrated ring and an active magnetic energy base. The integrated ring is connected to the tail end of a rocket through a flange and comprises an aluminum silicon carbide structure base body, an aluminum-coated steel coil, a cooling channel and a crushable honeycomb module, and the periphery of the integrated ring is coated with a carbon fiber outer wrapping layer and a carbon / silicon carbide shielding layer. The top of the active magnetic energy base is provided with a Halbach magnet array and a driving coil, and the bottom is provided with a moving mechanism. During launching, the driving coil is electrified to generate a traveling wave magnetic field which acts with the integrated ring to generate electromagnetic repulsive force to boost takeoff; during recovery, the integrated ring cuts into a static magnetic field to generate eddy current damping deceleration, the cooling channel dissipates heat through phase change of a propellant, and the honeycomb module absorbs residual kinetic energy to achieve soft landing. Bidirectional energy reuse of launching boosting and damping recovery is achieved, and the rocket carrying efficiency and recovery reliability are remarkably improved.

The present invention relates to a field coil stable power system for generating and stabilizing electrical output. The system includes a ferromagnetic core, preferably made of iron, that interacts with a field coil. The field coil generates a magnetic field when current flows through it, and this magnetic field interacts with the magnetic field of a permanent magnet, producing attraction or repulsion forces on the ferromagnetic core. The ferromagnetic core absorbs magnetic energy and dissipates the magnetic energy gradually, preventing abrupt changes in current. The system is capable of stabilizing electrical output by balancing fluctuations in current and is applicable to various electronic devices, including audio equipment and medical devices.

An ion-permeation energy conversion device and its control method based on light and magnetic energy regulation are disclosed. When the ion-permeation energy conversion device is in working condition, the magnetic field strength of the permanent magnet is adjusted to disperse the magnetic nanoparticles, and the concentrator is adjusted to heat the ion-permeation energy conversion device body with photothermal magnetic nanoparticles to improve power generation performance. When the ion-permeation energy conversion device is in non-working condition, the magnetic field strength of the permanent magnet is adjusted to distribute the magnetic nanoparticles at the interface between the nanoselective membrane and the low-concentration reservoir to prevent ion transport, and the concentrator is adjusted to make the light intensity on the nanoselective membrane exceed the threshold to form a reverse driving force, further hindering ion diffusion and synergistically solving the self-discharge problem of the ion-permeation energy conversion device body.

The invention relates to the technical field of motor driving and control, and discloses a method for improving low-speed stability and high efficiency of a motor, which comprises the following steps of: suppressing armature reaction harmonic waves by adopting a fractional slot winding design; the stator side adopts a bionic asymmetric slot type, a tooth slot magnetic conductance analytical model is established, and magnetic field distribution is optimized; a skewed pole and magnetic isolation structure is designed on the rotor side, magnetic leakage is reduced, and cogging torque dominant harmonic waves are suppressed; a non-uniform air gap is designed to improve the amplitude of an air gap flux density fundamental wave; and a multi-target optimization algorithm is combined to optimize parameters of the winding, the slot type and the skewed pole. Through collaborative design of the fractional-slot winding, the stator bionic asymmetric slot type and the rotor skewed pole, higher harmonics in armature reaction can be weakened in a targeted manner, harmonic torque is avoided, and periodic fluctuation of cogging torque is reduced; the skewed pole design of the rotor further suppresses cogging torque dominant harmonic waves; the design of the magnetic isolation bridges and the U-shaped magnetic isolation grooves on the rotor side can cooperate with the arrangement of the V-shaped permanent magnets to block a magnetic leakage path, and the invalid loss of the magnetic energy of the permanent magnets is reduced.

The invention provides a forming method of a high-density magnet and the high-density magnet. The forming method of the high-density magnet comprises the following steps that NdFeB magnetic powder with the residual magnetism Br of 13.5-14.5 kGs and the maximum magnetic energy product (BH) max of 38-42 MGOe is smashed, and the particle size of the smashed NdFeB magnetic powder ranges from 30 micrometers to 150 micrometers; the NdFeB magnetic powder is subjected to HDDR treatment; manufacturing a blank body; and the blank body is put into a forming press with the temperature, the magnetic field and the explosion field, explosive cladding is carried out under the conditions that the temperature is 100-150 DEG C, the magnetic field intensity is larger than or equal to 1 T and the instantaneous pressure generated by the high-energy explosion field is 5000-10000 MPa, the magnetic powder is tightly formed, and the high-density magnet is obtained. According to the method, the high-density and high-magnetic-performance magnet is rapidly prepared through multi-field synergistic compounding of the temperature field, the magnetic field, the explosion field and the pressure field, the technological process is remarkably shortened, and the production cost is reduced.

The invention provides a ripple signal generation circuit and a switching converter, which are applied to output ripple compensation of a COT-controlled switching converter, and comprises a first processing unit for generating a ripple signal of which the amplitude is gradually increased in a magnetic energy conversion stage; the second processing unit is used for controlling the amplitude of the ripple signal to be constant in the interrupted stage; wherein the magnetic energy conversion stage represents an inductive current rising stage and / or an inductive current falling stage, and the interruption stage represents a stage that the inductive current is zero in the DCM mode. When the ripple signal generation circuit provided by the invention is in a DCM mode, the second processing unit can control the amplitude of the ripple signal to be constant in an intermittent stage, so that the situation of double pulses in the DCM mode is avoided, and the dynamic performance of the switching converter is ensured.

1. Name of the product in this design: Single-phase anti-magnetic energy meter. 2. Purpose of this design: This design is used for electricity metering. 3. The key design features of this product are its shape. 4. The image or photograph that best illustrates the design's key points: a 3D model.

The invention discloses an electromechanical energy conversion platform and method based on direct driving of static magnetic energy, and belongs to the field of electromechanical energy conversion. The platform comprises a permanent magnet used for establishing a static magnetic field; the rotor is provided with an asymmetric magnetization structure and can be acted by inherent net magnetic force in the magnetic field; and the magnetic circuit regulation and control unit is used for controlling the magnetic coupling state between the static magnetic field and the rotor with low power consumption. Through switching of the regulation and control unit, the net magnetic force can be controlled to drive the rotor to move, and mechanical energy output is achieved. According to the scheme, mechanical energy output mainly and directly comes from permanent magnet static magnetic energy, and the rotor does not need an armature winding bearing power current. Based on the same principle, devices such as a linear actuator, a bionic antagonism driving pair and a rotating motor with a rotor free of a winding can be derived. Compared with a traditional power-consumption magnetic-generation driving mode, the scheme provides a different technical path of magnetic-regulation energy-control driving, and shows beneficial effects in the aspects of system energy efficiency, power density, silent operation and controllability.

The invention relates to the technical field of magnetic therapy equipment design, and discloses a magnetic circuit analysis method of a permanent magnetic field sleep magnetic therapy instrument, which comprises the steps of stimulation mode design, static magnetic circuit working point selection, self-demagnetization effect guide design and finite element simulation verification, in static magnetic circuit working point selection, a load line is constructed through demagnetization curve feature points, the maximum magnetic energy product point is determined, and the working point coordinate ratio is corrected; in self-demagnetization effect guiding design, a closed magnetic circuit structure is adopted; reverse compensation magnetic ring installation and magnetic domain stabilization processing are carried out; a magnetic therapy instrument and human tissue coupling model is constructed through finite element simulation verification; and the four parts are executed in sequence and mutually linked to form a closed loop. The method solves the problems that a traditional magnetic circuit is low in magnetic energy utilization rate, large in self-demagnetization influence and the like, magnetic field accurate focusing and magnetic circuit stable operation are achieved, and the sleep treatment requirement is met.

The invention discloses a sunken magnetic block positioning and carrying structure, and relates to the technical field of automatic mounting of strong magnetic steel, the sunken magnetic block positioning and carrying structure comprises a base and a strong magnetic steel block, the lower surface of the base is fixedly connected with the upper end of a magnet attraction block, the magnet attraction block generates magnet attraction block upward attraction force to be magnetically connected with the strong magnetic steel block, and the base is slidably connected with a limiting unit. And the limiting unit is sleeved on the outer peripheral surface of the magnet attracting block. According to the sunken magnetic block positioning and carrying structure, the problems of attraction force and repulsive force between magnetic steel and the magnetic blocks after the magnetic blocks are larger than 30 mm * 10 mm, the magnetic energy product is larger than 45 MGOe, residual magnetism Br is larger than 13 T and Hcj is larger than 14 KOe can be well solved, the working efficiency is greatly improved, and the magnetic blocks are not prone to being damaged. And the problem that the magnetic steel is fragile due to too large instant suction force between the base and the magnetic steel during manual mounting is also solved.

The invention relates to the technical field of magnetic element performance optimization, and particularly provides a magnetic element magnetic core loss modeling and optimizing method under data driving. The method comprises the steps of constructing a classification model and outputting a classification result; introducing a temperature variable to improve the Steinmaz equation, constructing three improved equations, and screening the optimal improved equation; single-factor and multi-factor variance analysis is adopted to determine a combination condition of magnetic core loss minimization; constructing a regression model according to a combination condition of magnetic core loss minimization, selecting three optimal models for weighted fusion, constructing a magnetic core loss prediction model, and obtaining a prediction result; based on the magnetic core loss prediction model, the objective function is constructed, and the conditions of magnetic core loss minimization and transmission magnetic energy maximization are obtained, so that the method improves the magnetic core loss modeling precision and optimization efficiency, provides a scientific basis for the design and operation regulation of the magnetic element, and meets the requirements of the fields of new energy, communication and the like for the high performance of the magnetic element.

The invention discloses a pulsed magnetic field stimulation coil device based on a silicon steel magnetic core and an air gap structure. The pulsed magnetic field stimulation coil device comprises the silicon steel magnetic core and a winding, the silicon steel magnetic core is vertically arranged and comprises an upper arm, a left arm, a lower arm and a right arm, and the four arms are sequentially connected to form an annular cuboid structure. A fracture is formed in the middle of the lower arm, and the two fracture arms are symmetrical relative to the vertical center line of the silicon steel magnetic core. A winding is wound in the middle of the upper arm; the fracture sections of the two fracture arms are opposite, and an air gap structure is formed between the two opposite fracture sections. The whole magnetic circuit is composed of a silicon steel magnetic core magnetic circuit and an air gap magnetic circuit. The high-permeability silicon steel magnetic core is adopted to concentrate magnetic flux and directionally output a magnetic field through an air gap, compared with the magnetic field dispersion problem of a traditional hollow coil and low-efficiency magnetic conduction of a conventional magnetic core, the design greatly reduces dispersion of magnetic energy in a non-target area, energy loss is remarkably reduced, the low power consumption level close to wearable equipment can be achieved, and the application range is wide. And the magnetic circuit efficiency is obviously improved.

The electromagnet driving device is mainly characterized in that a suction plate is obliquely arranged between the suction surface of an electromagnet and two supports, the bottom of the front face of the suction plate abuts against the bottom end of the suction surface of the electromagnet, and the lower half portion of the suction plate and the electromagnet are in the state that the distance between the lower half portion of the suction plate and the electromagnet is small; a primary transmission plate and a secondary transmission plate are arranged on the middle portion and the upper portion of the suction plate respectively, when the suction plate is sucked, the primary transmission plate which is located in the middle of the suction plate and has a small distance from the electromagnet is operated firstly, and after the upper portion of the suction plate is sucked by the electromagnet, the secondary transmission plate is operated. Therefore, the two transmission plates can extract and convert the attraction force of the electromagnet at the position with a small distance, and the magnetic energy of the electromagnet can be better extracted and converted.

This invention relates to the field of magnetic therapy equipment design technology, and discloses a magnetic circuit analysis method for a permanent magnetic field sleep magnetic therapy device. The method includes stimulation mode design, static magnetic circuit operating point selection, self-demagnetization effect guidance design, and finite element simulation verification. The stimulation mode design includes static and dynamic modes. Static magnetic circuit operating point selection determines the maximum magnetic energy accumulation point by constructing a load line using characteristic points of the demagnetization curve and correcting the operating point coordinate ratio. The self-demagnetization effect guidance design employs a closed magnetic circuit structure, reverse compensation magnetic ring installation, and magnetic domain stabilization treatment. Finite element simulation verification constructs a coupling model between the magnetic therapy device and human tissue. These four parts are executed sequentially and interconnected to form a closed loop. This method solves the problems of low magnetic energy utilization and significant self-demagnetization impact in traditional magnetic circuits, achieving precise magnetic field focusing and stable magnetic circuit operation, thus meeting the needs of sleep therapy.

1. Name of the product in this design: Magnetic Energy Sensor. 2. Purpose of this design: To utilize magnetic field energy for power generation and to collect and monitor temperature data of easily heated contacts in electrical equipment such as DC cabinets. 3. The key design feature of this product is its shape. 4. The image or photograph that best illustrates the design's key points: 3D view 1.

A multi-winding high-frequency transformer leakage inductance analytical calculation method, comprising: determining the number of leakage inductances of the secondary winding corresponding to different primary windings according to the number of primary and secondary windings of the multi-winding high-frequency transformer; dividing the leakage magnetic energy region corresponding to different leakage inductances into winding interlayer insulation region, winding insulation region, through-flow winding region and open-circuit winding region; deriving the magnetic field intensity of the winding interlayer insulation region and the winding insulation region; deriving the magnetic field intensity of the through-flow winding region and the open-circuit winding region based on Maxwell's equations; further integrating the corresponding leakage magnetic energy according to the magnetic field intensity of each region; calculating the leakage magnetic energy corresponding to each leakage inductance according to the different leakage magnetic energy calculation region of each leakage inductance, summing the leakage magnetic energy of the corresponding region, and then calculating the leakage inductance parameters according to the magnetic field energy method. The method considers the open-circuit winding unique in the leakage inductance calculation process of the multi-winding high-frequency transformer, and accurately calculates the leakage magnetic energy of the open-circuit winding.

The embodiment of the utility model provides a magnetic attraction part, a magnetic wheel and an adsorption device, and the magnetic attraction part comprises a first arc-shaped magnet which has a first radial magnetizing direction, and a first magnetic pole of the first arc-shaped magnet is located in the first radial magnetizing direction and is used for generating adsorption force on a magnetic conduction wall surface; and the second arc-shaped magnet has a tangential magnetizing direction, and the tangential magnetizing direction intersects with the first radial magnetizing direction, so that the magnetic field of the second arc-shaped magnet is concentrated on the first arc-shaped magnet along the tangential magnetizing direction, and the magnetic field intensity of the first magnetic pole is enhanced. By adopting the first arc-shaped magnet and the second arc-shaped magnet, the magnetic field intensity of the first magnetic pole in the radial direction can be enhanced, so that the problem of low magnetic energy utilization efficiency of a magnetic attraction piece used by a wall-climbing robot in the related technology is improved or solved.

The application discloses a kind of no-load loss prediction systems of distribution transformer based on multi-objective optimization, it is related to electric power equipment energy efficiency evaluation technical field, by obtaining the data of distribution transformer under different operating conditions, according to the segmented processing of data on the basis of magnetic flux density variation characteristics, the segmented parameter space of linear zone, transition zone and saturation zone is constructed, and on this basis interval identification constraint is introduced, the partition control of parameter search is realized;Combined with magnetic energy variation continuity constraint and particle trajectory constraint update, the evolution path of candidate solution is limited, and through the screening of partition non-dominated solution and interval boundary transition correction, continuous parameter combination is formed;Further based on the parameter combination, the prediction result of continuous change in the whole magnetic flux range is obtained by calculating and smoothing the no-load loss in each interval;The application can effectively solve the prediction instability and boundary distortion problem under high magnetic flux density condition in the prior art, improve the accuracy and continuity of no-load loss prediction.