81 results about "Magnetic potential" patented technology

The invention discloses a design method of a coreless stator axial magnetic flux permanent magnet motor. The method specifically comprises the following steps: firstly, determining a basic structure, a permanent magnet structure and performance demand parameters of the coreless stator axial magnetic flux permanent magnet motor; determining stator and rotor structure parameters of the motor according to the performance requirement parameters of the motor; establishing a simplified model of an internal magnetic circuit of the motor, determining excitation magnetic potential of the motor, and establishing a finite element dynamic simulation model of the coreless stator axial flux permanent magnet motor based on a Maxwell equation; and finally, comparing the finite element dynamic simulation result with the motor performance demand parameter, if the finite element dynamic simulation result does not meet the requirement, correcting the motor design structure parameter and the electromagnetic parameter, and re-determining the stator and rotor structure parameter of the motor until the finite element dynamic simulation result of the motor meets the motor performance demand parameter. The design cost of the coreless stator axial magnetic flux permanent magnet motor is reduced, the design period is shortened, and the design efficiency and the design precision are improved.

The invention belongs to the field of electromagnetic particle simulation, and relates to a vacuum confluence region electromagnetic particle simulation method, system, equipment and medium, and the method comprises the following steps: S1, constructing a particle simulation domain of an electric field and a magnetic field of a vacuum confluence region, injecting particles into the particle simulation domain, and carrying out the regional decomposition of the particle simulation domain to obtain a plurality of sub-domains; s2, acquiring charge density and current density of grid points in each sub-domain; discretizing a Maxwell equation set into a form of a Cx = D equation, substituting the charge density and the current density of the grid points in each sub-domain into the Cx = D equation, and solving the Cx = D equation by adopting a GMRES algorithm to obtain potential and vector magnetic potential distribution in each sub-domain; s3, the electric field intensity and the magnetic induction intensity of the grid points in each sub-domain are solved, the electric field and the magnetic field borne by the particles are obtained, and therefore the positions of the particles in the next time step in each sub-domain are determined; and S4, updating the electric field and the magnetic field borne by the particles in each sub-domain in the next time step.

The invention discloses an intelligent power grid optimization scheduling method based on digital twinning, and relates to the technical field of power grid optimization scheduling, and the method comprises the steps: building a dynamic power grid mirror image model according to a standardized power grid data matrix, and generating an evolution trajectory prediction report through a quantum magnetic coupling mechanism; establishing a variable association network based on the evolution trajectory prediction report, and generating an optimization scheduling instruction set in combination with the standardized data matrix; executing an optimization scheduling instruction set to obtain magnetic potential gradient distribution, and generating a topology reconstruction scheme by identifying a magnetic potential change trend; and inputting the topology reconstruction scheme into the dynamic power grid mirror image model to generate an electromagnetic field evolution trajectory, and generating a safety scheduling report in combination with magnetic potential energy gradient distribution. According to the method, the power grid magnetic field data is coded into an evolution trajectory prediction report through a quantum-magnetic coupling mechanism, and high-precision risk pre-judgment is realized; a topology reconstruction scheme is dynamically generated according to the electromagnetic energy gathering trend, and the power grid optimization scheduling efficiency is improved.

The invention discloses a static electromagnetic calculation method of a physical information neural network based on Fourier mapping, and the method comprises the steps: constructing a full-connection network structure fusing a Fourier mapping mechanism, and designing a parallel modeling architecture of a plurality of three-output sub-networks to adapt to multi-region medium division, network output predicts vector magnetic potential, normal magnetic field intensity and tangential magnetic field intensity at the same time, the problem of network training instability caused by medium mutation is relieved, and meanwhile the network training process has higher physical interpretation performance; vector magnetic potential and magnetic field component continuity are introduced as interface coupling physical constraints, and global physical consistency of solutions is ensured. A Fourier feature mapping mechanism is introduced into a physical information neural network structure, so that the expression capability of a neural network on high-frequency spatial features is enhanced, and efficient modeling of complex boundaries, medium distribution and multi-source coupling problems in a two-dimensional static electromagnetic field is realized; explicit annotation data is not needed, and the method is suitable for modeling and prediction of various static electromagnetic problems.

The invention discloses a multi-sub-network collaborative modeling method for unsupervised solution of a multi-domain electromagnetic field, and the method comprises the steps: carrying out the partitioning of a computational domain in a solving region according to medium parameters and field source information, and dividing the whole region into a plurality of physical sub-regions; a neural network model is independently deployed in each sub-region and is used for fitting electromagnetic field distribution in the region, so that the learning ability and modeling precision of the network for local physical characteristic changes are improved; a cross-network continuity coupling mechanism is constructed between sub-regions, and a continuity loss function of a magnetic field tangential component corresponding to a vector magnetic potential value continuity constraint and a space derivative thereof is introduced at an interface of adjacent regions, so that physical coupling between sub-networks is realized; and the boundary continuity of the electromagnetic field solution among different regions and the consistency of the overall solution are ensured. The method has the advantages of being high in universality, high in capacity of adapting to complex boundary conditions and the like, and is suitable for modeling and simulation calculation of multi-region, multi-material and multi-source coupling field problems.

The invention discloses a method for searching the stroke center position of a rotor and camera module assembly equipment, which are applied to camera module assembly and comprise the following steps: S1, electrifying a motor, and adjusting the gain coefficient of an anti-shake part of the motor to keep the rotor of the motor stable in a no-load state; s2, the rotor is controlled to move to limit positions in the first direction and the second direction, magnetic potential values corresponding to the limit positions are obtained, and a target magnetic potential value corresponding to the stroke center position of the rotor is calculated based on the magnetic potential values of the limit positions; and S3, controlling the mover to move to a position corresponding to the target magnetic potential value, and completing repositioning of the stroke center position, so that gaps between the mover and the lens are uniformly distributed. According to the invention, the stroke center position of the motor rotor is dynamically fitted in real time.

The invention discloses a rapid calculation method for electromagnetic vibration of a permanent magnet synchronous motor, and belongs to the technical field of electromagnetic field calculation. According to the method, a magnetic potential and magnetic conductance method is innovatively combined with an improved sub-domain method, the problem of complexity of electromagnetic field distribution of a nonlinear material is effectively solved through the magnetic potential and magnetic conductance method, and the capture precision of electromagnetic field changes is remarkably improved by dividing a computational domain into a plurality of sub-domains through the improved sub-domain method. According to the method, the influence of the tangential electromagnetic force wave and the harmonic current is fully considered, and high-precision calculation of the electromagnetic force can be realized. On the basis, a stator core shell equivalent theoretical model is established, the inherent frequency of the stator is calculated by adopting an energy method, and the accuracy of the model is verified through a modal experiment. Furthermore, by determining the frequency response function of the stator in the low-order mode, the acceleration spectrum and electromagnetic force wave distribution of the prototype stator in each mode are obtained based on the linear superposition principle. Compared with a traditional electromagnetic-structure coupling finite element model, the method has the advantages that the calculation efficiency is remarkably improved while the calculation precision is guaranteed, the calculation time is shortened by 59.3%, and efficient and reliable technical support is provided for optimization design of electromagnetic equipment.

According to the current comparator based on the diamond NV color center, an iron core module comprises an annular iron core, and the iron core module is arranged on a primary current path in a sleeving mode; the primary feedback module comprises a direct current sensor, a secondary winding and a driven current source; the secondary winding is wound on the annular iron core of the iron core module, the driven current source generates output current, the output current flows through the secondary winding to generate reverse magnetic potential in the annular iron core, and primary magnetic balance in the iron core is achieved; and the secondary feedback module comprises a diamond NV color center magnetic detector module and a PID controller, the diamond NV color center magnetic detector module measures the unbalanced magnetic potential, and the PID controller compensates the current in the secondary winding according to the unbalanced magnetic potential, so that zero magnetic flux is always locked in the iron core. According to the technical scheme, the diamond NV color center magnetic detector module is introduced into the secondary feedback module, the unbalanced magnetic potential in the iron core can be detected in a high-precision mode by means of quantum characteristics, and the measurement precision is greatly improved through the sensitive sensing capacity of the secondary feedback module on tiny magnetic field changes.

The present invention discloses a design method for an AC excitation variable-speed pumped-storage dynamic simulation motor, which belongs to the field of dynamic simulation of power systems. The method is consistent with a prototype machine in the selection of stator and rotor winding structures and unit motor slot matching, so that the dynamic simulation unit can accurately simulate the magnetic potential harmonic orders of the prototype machine, and optimizes the harmonic leakage reactance per unit value of the dynamic simulation prototype to be consistent with that of the prototype machine, which is conducive to the dynamic simulation unit simulating the prototype machine more accurately in terms of harmonic characteristics. In addition, the stator and rotor winding structure of the motor is directly related to its relay protection mode, and the stator and rotor winding structure of the dynamic simulation unit designed according to the method provided by the present invention is consistent with that of the prototype machine. Therefore, research on the relay protection of the dynamic simulation unit designed according to the present invention can play a role in guiding the relay protection of the prototype machine.

The invention belongs to the technical field of magnetic field measurement and instruments, and relates to a magnetic gradient tensor field interpolation method under physical potential field constraint, which comprises the steps of establishing a Gaussian process model of a magnetic gradient tensor field, acquiring a magnetic potential core and performing hyper-parameter optimization. According to the method, multi-component interpolation and curving are fused into a unified Gaussian process regression framework, and the multi-component interpolation and the curving are subjected to potential field physical constraints in a unified manner; a complete potential field physical constraint is used, meanwhile, no-rotation and no-divergence constraints are met, and magnetic gradient tensor measurement data interpolation with measurement errors is more accurate and better in anti-interference capability; by introducing a complete physical constraint fusion Gaussian process regression framework, the magnetic gradient tensor interpolation precision and stability are improved. Based on the magnetic potential core, all magnetic gradient tensor components can be modeled at the same time in the joint probability model, physical constraints among the components are guaranteed, non-planar data which are distributed at will can be processed naturally based on a Gaussian process regression framework, and an additional potential field continuation step is not needed.

The invention relates to a transformer leakage inductance calculation method and device and computer equipment. The method comprises the following steps: acquiring magnetic induction intensity and vector magnetic potential of any point in an iron core window; obtaining magnetic field energy in an iron core window area based on the magnetic induction intensity and geometric parameters of the iron core window; based on the vector magnetic potential and the cross section size of the winding area, obtaining interaction energy of the current and the vector magnetic potential in the winding area; on the basis of the interaction energy and the magnetic field energy, magnetic leakage energy stored by a unit length winding is obtained; the leakage inductance of the transformer is obtained based on the total leakage flux energy of the winding and the winding current of the low-frequency equivalent circuit, and the total leakage flux energy is obtained through calculation based on the leakage flux energy stored by the winding per unit length and the winding length.

The application relates to the technical field of motors, in particular to a rotor and a motor. The rotor is arranged on the inner circumferential side of a stator of the motor, and comprises a rotor core and a magnetic unit. The material of the rotor core is a non-magnetic conductive material, and a plurality of fixing grooves are arranged on the rotor core and are distributed along the circumferential direction of the rotor core. The magnetic unit is arranged in the fixing grooves, and the magnetic unit comprises a permanent magnet and a magnetic conductor. In the same magnetic unit, the permanent magnet is located on the same side of the magnetic conductor in the circumferential direction of the rotor core, and the end of the permanent magnet close to the magnetic conductor is of the same type of magnetic pole. The magnetic field generated by the excitation of the stator can complete the closure of the magnetic flux through the magnetic conductor, the magnetic potential difference formed by the magnetic permeance difference of the magnetic circuit can generate a drag torque F1, and the magnetic potential difference formed by the magnetic field generated by the excitation of the stator and the magnetic field of the permanent magnet can generate a drag torque F2. The resultant force of the drag torque F1 and the drag torque F2 can drive the rotor to rotate.

The invention discloses an electric field evaluation method and system based on potential-power transmission line coupling, and relates to the technical field of power system protection, and the method comprises the steps: building a current fluctuation model based on a lightning channel engineering model; hybrid emission of a current element i and a charge element q is adopted based on a current fluctuation model; obtaining a voltage U'under the condition of lossy earth through the induced voltage on each section of line; obtaining a total horizontal voltage based on the voltage under the condition of lossy earth and the voltage under the condition of lossless earth; the electric field is evaluated based on the total horizontal voltage. On the basis of a dipole current model, charge distribution introduction, current generation of magnetic potential and charge generation of potential are combined, the relative positions of charges and current elements can be improved when an electric field channel is discretely simulated by a computer, a near-field electric field can be simulated more accurately, and the simulation precision is improved. Meanwhile, the divergence problem caused by calculation truncation errors can be counteracted when the structure is coupled with a coil type structure, and the accuracy and stability of calculation are improved.

The invention discloses a crawler-type magnetic motor applied to axial closed-circuit and open-circuit magnetic fields. The axially-magnetized annular planetary permanent magnets have the magnetic attraction effect on the inner edge face of the pressure-bearing type oval steel crawler belt, two radial magnetic potential included angles on the upper side and the lower side of the inner edge of the crawler belt are formed, side magnetic poles of the planetary permanent magnets at the lower side included angles are attracted by heteropole permanent magnets, the magnetic field of the planetary permanent magnets is in a closed circuit, the magnetic force on the crawler belt disappears, and the crawler belt is in a follow-up state; the side magnetic pole magnetic field of the planetary permanent magnet at the upper included angle is in an open state, and the outer edge of the large circular section of the track on the side is temporarily fixed at the inner edge of the stator under the attraction of the rotating permanent magnet to form a radial magnetic potential for pulling the circular planetary permanent magnet and the track to roll together along the inner edge of the stator; the closed magnetic action environment causes the crawler belt to roll circularly to drive the output shaft to rotate and output. The device can be widely applied to the fields of transportation, energy construction, energy conservation, environmental protection and the like, is simple in mechanical structure and manufacturing process, and has wide industrial and commercial application values.

The present invention discloses a T-type Halbach plug-in axial flux motor and an analytical method thereof. The motor structure is a double-stator single rotor, and a plug-in T-type Halbach magnetic pole array is provided between the rotor and each stator, and the magnetic pole array includes a plurality of magnetic poles. In the method, a subdomain model method is first used to divide the motor into three subdomains, and the magnetization intensity components of different subdomains are respectively given to establish a double Fourier decomposition expression of the total magnetization intensity. Secondly, according to the Poisson equation and the Laplace equation in a three-dimensional coordinate system, the separation of variables method is used to calculate the general solution expression of the scalar magnetic potential of each subdomain. Then, according to the interface connection condition of the Ampere circuit law and the flux continuity principle, the unknown coefficients in the scalar magnetic potential are solved, and based on the relationship between the magnetic field intensity and the magnetic flux density and the scalar magnetic potential, the general expressions of the magnetic field intensity and the magnetic flux density are calculated. Then, the Carter coefficient is introduced to correct the magnetic flux density to obtain the corrected magnetic flux density expression.

The invention discloses a slice motor single-phase short-circuit fault-tolerant current reconstruction method for eliminating reverse magnetic potential, which adopts a six-tooth and one-pair-pole motor structure, and constructs five-phase current to eliminate the reverse magnetic potential by constructing a magnetic potential expression of residual-phase current in an air gap after single-phase short circuit, extracting the reverse magnetic potential and enabling the reverse magnetic potential to be equivalent to a magnetic vector. The method comprises the following specific steps: firstly, according to a magnetic potential calculation formula, extracting a reversal magnetic potential expression and enabling the reversal magnetic potential expression to be equivalent to a magnetic vector; secondly, five-phase current is constructed through the vector superposition principle, and it is ensured that reversal magnetic potentials are mutually counteracted; and finally, considering the influence of the short-circuit current on the reversal magnetic potential, correcting the adjacent tooth current of the short-circuit current phase, and further eliminating the reversal magnetic potential caused by the short-circuit current. According to the invention, by eliminating the reverse magnetic potential, stable suspension of the slice motor under a single-phase short-circuit fault is realized, suspension force pulsation is avoided, and the fault-tolerant performance and practicability of the slice motor are improved.

This invention relates to the field of geophysical exploration, specifically disclosing a method for identifying geological body boundaries based on adaptive matching of multi-source gravity and magnetic data. The method includes: acquiring gravity and magnetic anomaly data; estimating the equivalent source depth; constructing a depth-response mismatch correction field based on the depth attenuation difference between gravity and magnetic potential fields; compensating for and registering the magnetic anomaly with remanent magnetization and demagnetization offset; constructing an adaptive coupling direction tensor based on the consistency of the local gradient structures of the two fields; performing anisotropic boundary enhancement on the two fields using the principal direction of the adaptive coupling direction tensor as a constraint and the coupling strength as a weight; and iteratively fusing the two fields through mutual verification using the adaptive coupling direction tensor as a constraint and the depth-response mismatch correction field as a weight, outputting the fine spatial location of the geological body boundary and an adaptive confidence evaluation result. This invention achieves adaptive registration and direction constraint enhancement in the depth domain of gravity and magnetic data, effectively improving the accuracy and reliability of geological body boundary identification under complex geological conditions.

The invention relates to the technical field of magnetic anomaly data processing, and discloses a curved surface potential field continuation method based on a double-layer equivalent source, and the method comprises the steps: carrying out the Fourier transform of an observed gravity and magnetic potential field, and obtaining the equivalent source depth of a low-frequency band and the equivalent source depth of a high-frequency band through the calculation of a radial average logarithm power spectrum; according to the spatial position of each observation point in the gravity-magnetic potential field, in combination with the equivalent source depth of the low-frequency band and the equivalent source depth of the high-frequency band, performing mesh generation on an underground space, constructing a double-layer equivalent source model, and in combination with the spatial position of each observation point and the terrain height, calculating a sensitivity matrix of the gravity-magnetic potential field; based on the sensitivity matrix, a generalized minimum residual method is adopted to carry out inversion calculation, equivalent source physical property parameters of the double-layer equivalent source model are obtained, forward calculation is carried out on the gravity and magnetic potential field, and potential field extension results of different observation heights are generated; according to the method, stable continuation processing of a large-data-volume curved surface potential field and a long-distance space is realized, and the calculation precision of continuation of the curved surface potential field is improved.

The invention discloses a transformer iron core magnetic flux leakage suppression structure and method and a transformer, the structure comprises an iron core web plate clamping piece and a magnetic-force shunting module, the iron core web plate clamping piece is provided with at least one fracture, and the magnetic-force shunting module is installed at the fracture and used for forming a magnetic potential barrier at the fracture and introducing the magnetic potential barrier into a specified channel. According to the method, a magnetic flux leakage path is reconstructed fundamentally, the confinement of a traditional magnetic flux leakage shielding or blocking idea is broken, passive shielding is changed into active dredging and management, the eddy current loss can be remarkably reduced, the problems of local overheating, transformer vibration noise and the like can be effectively restrained, and the energy efficiency and long-term operation reliability of the transformer are improved.

The invention relates to the technical field of permanent magnet eddy current speed regulation, in particular to a torque driving effective magnetic potential design method and system for a permanent magnet magnetic driver, and the method comprises the steps: obtaining basic information and transmission torque; performing torque transmission calculation according to the transmission torque to obtain a kinetic model and a space magnetic potential model; performing magnetic flux density and torque driving calculation according to the kinetic model and the space magnetic potential model to obtain a magnetic flux density expression and a torque driving magnetic potential expression; performing physical derivation according to the magnetic flux density expression to obtain a magnetic force expression; according to the magnetic force expression and the kinetic model, performing calculation to obtain an equivalent stiffness coefficient physical model; and modeling according to the torque driving magnetic potential expression and the equivalent stiffness coefficient physical model to obtain a torque driving effective magnetic potential mathematical model. According to the method, the effective magnetic potential driven by the torque of the permanent magnetic driver can be directly calculated through each physical quantity in the driver.

The present invention discloses a method for modeling an equivalent magnetic network and calculating eddy current losses of a flux-switching permanent magnet motor. The method comprises the following steps: establishing an equivalent magnetic network model, wherein the equivalent magnetic network model of the flux-switching permanent magnet motor consists of four branches: an iron core magnetic impedance branch, a permanent magnet magnetic reluctance magnetic potential source branch, an armature winding magnetic potential source branch, and an air magnetic reluctance branch; correcting the magnetic resistance value of the iron core magnetic impedance branch using an extrapolation method based on the B-H curve of the iron core material; and correcting the magnetic induction value of the iron core magnetic impedance branch using an iterative method based on the eddy current effect of the iron core material. In the process of solving the equivalent magnetic network model of the flux-switching permanent magnet motor, a real-domain WZ decomposition method and a successive super-relaxation iteration method are used to simplify and accelerate the solution process of the complex equation system established by the nodal magnetic potential method. The present invention can quickly and accurately evaluate the torque performance and eddy current losses of the flux-switching permanent magnet motor, effectively shortening the calculation time in the motor analysis and design stage.

The application relates to the technical field of extreme ultraviolet light generation, in particular to a magnetic levitation potential well coagulation device and a metal droplet coagulation method. The magnetic levitation potential well coagulation device comprises a magnetic potential well generator, a detection sensor and a controller. The magnetic potential well generator is arranged at the downstream of a metal droplet generator, and the magnetic potential well generator is configured to generate a magnetic potential well to generate a force on the metal droplets output by the metal droplet generator, and the force can reduce the movement speed of the metal droplets. The detection sensor is arranged at the downstream of the magnetic potential well generator, and the detection sensor can detect the size of the metal droplets. The detection sensor and the magnetic potential well generator are in communication connection with the controller, and the controller is configured to control the start, the stop and the adjustment of the strength of the magnetic potential well generator according to the detection result of the detection sensor. The metal droplet coagulation method can make the size of the metal droplets meet the generation requirements of extreme ultraviolet light when applied to the above-mentioned magnetic levitation potential well coagulation device.

This invention relates to the field of gravity measurement, aiming to provide a small-sized, high-precision gravimeter based on the principle of antimagnetic levitation. The gravimeter includes a low-frequency magnetic potential trap unit, a levitation oscillator unit, a displacement detection unit, and a cavity enclosure unit. The lens groups of the low-frequency magnetic potential trap unit, the levitation oscillator unit, and the displacement detection unit are all located in the cavity of the innermost insulated shell. This invention provides a measurement environment free from external influences for displacement detection of the levitation oscillator, counteracts adjustments to the vertical frequency in the antimagnetic levitation potential trap, and uses a photoelectric converter to measure voltage fluctuations caused by changes in laser intensity to reflect the motion of the object under test, achieving high-precision gravity measurement. The oscillator uses magnetic levitation and does not have mechanical contact with the environment, avoiding long-term irreversible deformation. It eliminates the need for bulky temperature control and magnetic shielding devices or other auxiliary equipment; therefore, the overall size of the gravimeter is small, easy to move, and inexpensive, facilitating widespread adoption.

The invention discloses a field-line coupling voltage calculation method and device, electronic equipment and a storage medium, and is used for solving the problems that a current field-line coupling calculation mode cannot effectively avoid discretization errors and is relatively poor in calculation stability. The method comprises the following steps: acquiring electromagnetic field observation data of a lightning channel; respectively solving scalar potential in the electrostatic field and vector potential in the magnetic field according to electromagnetic field observation data; constructing an incident electric field model according to the scalar potential and the vector potential; and according to the incident electric field model, carrying out voltage solving calculation based on the separation potential to obtain the coupling voltage on the transmission line within the influence range of the lightning channel under the lossless grounding condition. Therefore, the dependence on a high-order numerical algorithm is reduced directly through separation solution of the potential and the magnetic potential, the calculation structure can be simplified, the calculation complexity is reduced, the problem of error accumulation possibly introduced in the high-order algorithm is avoided, and higher efficiency and stability are achieved.

The application discloses a kind of earth magnetic field horizontal component representation methods of removing pole singularity, comprising: based on adolf schmidt semi-normalized spherical harmonic theory, the spherical harmonic representation of geomagnetic field magnetic potential function is obtained by spherical harmonic polynomial expansion calculation method;With south pole or north pole as center, mirror center symmetry extension is carried out to great circle on sphere, so that each point on sphere has a mirror point, so that the mirror extension function of geomagnetic field magnetic potential function is obtained;Two-dimensional Fourier expansion is carried out to mirror extension function using double Fourier series, and double coverage function expansion is obtained;Based on double coverage function expansion, the horizontal component of geomagnetic field is calculated, i.e. the spherical gradient of spherical magnetic potential function is calculated.The realization is based on the existing IGRF model magnetic potential expansion coefficient, the magnetic field tangent vector representation is obtained without being polluted by pole problem, and a new modeling idea and calculation method of spherical tangent vector field are provided.

An underwater all-optical six-axis force sensor based on an anti-magnetic suspension principle comprises a low-frequency magnetic potential well unit, a suspension mechanical oscillator unit and a displacement detection unit, and the low-frequency magnetic potential well unit suspends and binds the suspension mechanical oscillator unit in a water medium based on the anti-magnetic suspension principle. The stress motion displacement of the suspension mechanical vibrator unit is converted into a light intensity signal through the displacement detection unit, a stress result is obtained through corresponding calculation, and force sensing is achieved. The force sensor is a suspension oscillator without physical contact, the detection mode is all-optical signal detection based on optical fiber without physical contact, and the force sensor can be directly placed in a water medium to carry out force signal measurement. Compared with an optical fiber underwater acoustic sensor, the anti-magnetic levitation force sensor adopted in the scheme has the advantages of being simple in structure and low in system noise, six-axis force signal measurement can be achieved through a single levitation oscillator, and higher low-frequency underwater acoustic detection sensitivity is achieved.

The present invention discloses a method, device, medium and rail vehicle for determining the leakage inductance of a linear motor, which is applicable to the field of motor analysis and design. By establishing a three-dimensional rectangular coordinate system according to the structures of the primary winding and the secondary winding of the linear motor; adding an air-gap current, an image current and an equivalent current of the current coil passing through the iron core to the current coil of the linear motor for large-segment and small-segment processing to determine the large-segment components and small-segment components of the current coil at the three axes respectively, using the different small-segment components of the three axes to determine the distances between different small segments of each coil, and then determining the magnetic potential vectors on its three axes according to the distances and the different large-segment components of the three axes, further obtaining the magnetic flux of the current coil corresponding to other coils, calculating the end leakage inductance of the current coil by using the magnetic potential vector method and the superposition theorem, and then determining the end leakage inductance of each phase according to the position matrix of the linear motor. The whole process is based on the structure of the linear motor itself, improving the calculation accuracy of the end leakage inductance.

The present invention discloses a method and a system for obtaining large-current vacuum arc parameters under low-frequency current conditions, belonging to the technical field of vacuum switch process simulation. A three-dimensional model is established for the vacuum interrupter, and the magnetohydrodynamics theory is used to simulate the vacuum arc plasma, thereby establishing a three-dimensional magnetohydrodynamic model of the vacuum arc plasma. During the process of solving the large-current vacuum arc parameters in the model, since the ion parameters, electromagnetic field parameters, and electron parameters are interdependent, based on the degree of dependence between the parameters, the ion parameters and electromagnetic field parameters are calculated first, and then the electron parameters are calculated, which greatly improves the convergence of the calculation. At the same time, the present invention introduces electric potential and vector magnetic potential to solve the electromagnetic field parameters, reduces differential operations, lowers the calculation complexity, and has a relatively high calculation efficiency.

A tracked external rotor magnetic motor utilizing axial closed-circuit and open-circuit magnetic fields is disclosed. An axially magnetized annular planetary permanent magnet attracts the inner edge of a pressure-bearing elliptical steel track, creating two radial magnetic potential angles on the upper and lower sides of the track's inner edge. At the lower angle, the side poles of the annular permanent magnet are attracted by opposite-pole permanent magnets, resulting in a closed magnetic field that eliminates the magnetic force on the track, causing it to follow the magnet's movement. At the upper angle, the side poles of the annular permanent magnet have an open magnetic field, causing the permanent magnet roller to rotate under the radial magnetic potential, driving the output gear ring wheel. This closed-circuit magnetic effect forms the rotational cycle. This device not only increases the output power density but also compensates for the high friction, power loss, and noise associated with planetary rotation mechanisms. It can be widely applied in transportation, energy construction, energy conservation, and environmental protection. Its simple mechanical structure and manufacturing process make it valuable for broad industrial and commercial applications.