40 results about "Electromagnetic design" patented technology

The invention relates to the technical field of motors for washing machines, in particular to a high-speed permanent magnet motor for a washing machine, which comprises a stator iron core and a rotor iron core, the stator core is provided with 12 stator slots, the outer diameter is defined as OD, the inner diameter is defined as ID, the crack ratio K1 is ID / OD, and 0.6 < = K1 < = 0.7; and / or the stator core is provided with 12 first teeth, the first tooth width is defined as W1, the first tooth diameter ratio K2 is equal to S * W1 / (pi * ID), 0.36 < = K2 < = 0.46, and S is the number of stator slots. According to the invention, from the perspective of electromagnetic design, the change relationship between parameters such as motor slot pole ratio, crack ratio, tooth diameter ratio, yoke width, magnetic steel slot width, rib width and the like and related performance is given, and the structural design thought of stator tooth outer edge multi-segment line and rotor tooth outer edge multi-segment line is also given. Therefore, the low-speed output torque and the high-speed output power of the motor are improved, the efficiency of the motor at a low speed and a high speed is improved, and the anti-demagnetization capability of the motor is improved.

The invention relates to the technical field of safe operation of power systems and motors, and particularly discloses a method for calculating a safe operation boundary of a high-inertia energy storage type phase modifier under a fault, and the method comprises the steps: building an electromagnetic field calculation model of a two-dimensional linear part and a three-dimensional end part region according to an electromagnetic design scheme of the high-inertia energy storage type phase modifier; establishing a frequency and voltage support excitation control system of the high-inertia energy storage type phase modifier, carrying out bidirectional dynamic coupling on the excitation control system and the electromagnetic field calculation model, and obtaining the frequency and voltage of a power grid through a phase-locked loop; determining the loss value of each structural member in the fault process through an electromagnetic field calculation model; according to the ventilation system structure of the high-inertia energy storage type phase modifier, a fluid and thermal coupling calculation model is established, and the loss value of each structural member is used as a heat source to be introduced into the fluid and thermal coupling calculation model; and determining the safe operation limit time of the high-inertia energy storage type phase modifier under the system frequency or voltage fault according to the maximum temperature rise allowed by each structural member.

The invention discloses a built-in self-starting permanent magnet synchronous motor magnetic field analytical algorithm based on an equivalent magnetic circuit and an analytical method, and relates to the field of motor design. A self-starting permanent magnet synchronous motor has a starting cage and rotor surface slotting, so that magnetic field distribution is complex, a magnetic field analysis model is difficult to establish in a polar coordinate system, and meanwhile, rotor surface slotting causes air-gap magnetic field distortion, so that a traditional path calculation method is insufficient in precision and low in calculation precision. Although the numerical simulation result is accurate, the consumed time is long and the efficiency is low in the optimization design process of the motor; therefore, the invention provides a new thought for magnetic field analysis research of the self-starting permanent magnet synchronous motor, an equivalent magnetic circuit method is adopted to model a rotor structure, an analysis method is adopted to model an air gap domain and a stator structure, coupling is realized through a magnetic field continuity relation of a rotor and an air gap interface, and a conformal transformation method is combined to obtain the self-starting permanent magnet synchronous motor. A magnetic field analysis calculation model considering rotor slotting is established, efficient and accurate calculation of the magnetic field of the self-starting permanent magnet synchronous motor is achieved, and the design, research and development period of the motor can be greatly shortened; according to the research thought, the flux density, harmonic analysis and cogging torque of the air gap domain can be obtained, the accuracy of the magnetic field analytical model is verified through comparison with a finite element method, and an analytical method is provided for subsequent electromagnetic design and structure optimization.

The invention discloses a reflection offset compensation method for an outer surface coating of a high-transmission A interlayer structure radome, and belongs to the field of radomes. The invention provides a reflection cancellation compensation method for an outer surface coating of a high-transmission A interlayer structure radome, and aims to solve the problem of poor wave permeability of electromagnetic design of an existing A interlayer radome. The reflection cancellation compensation method comprises the following steps: determining respective thickness values of the coating and an outer skin; defining the initial thickness value of the inner skin, and obtaining the initial thickness value of the core layer according to the initial thickness value; performing univariate optimization on the initial thickness value of the inner skin; performing univariate optimization on the initial thickness value of the core layer to obtain a first optimal solution of the core layer; and performing simulation verification on parameter combinations of the coating thickness value, the outer skin thickness value, the first optimal solution of the inner skin and the first optimal solution of the core layer. According to the method, the thickness of the inner skin serves as an independent compensation variable to be optimized in advance, the initial characteristics of bottom reflected waves are effectively remodeled, then collaborative optimization is carried out on the thickness of the core layer, finally, the wave transmission performance far exceeding that of a traditional method is achieved, the process is simple, and the computing power cost is low.

This application discloses a method and apparatus for obtaining coil electromagnetic parameters. The method includes: obtaining second-level parameters of a superconducting maglev train; the second-level parameters include the levitation force and guiding force characteristics generated by the vehicle and the figure-eight coil, the drag characteristics generated by the vehicle and the figure-eight coil, and the traction force characteristics of the vehicle; determining third-level parameters of the superconducting maglev train based on the second-level parameters; the third-level parameters include the centerline dimensions of the superconducting magnetic poles, the distance between the centerline and the figure-eight coil, the distance between the centerline and the stator coil of the linear motor, the magnetomotive force of the superconducting magnetic poles, the pole pitch of the superconducting magnetic poles, the coil operating temperature, and the overcurrent and over-limit safety margin of the superconducting coil; and determining the coil electromagnetic parameters of the superconducting magnet based on the third-level parameters; the coil electromagnetic parameters include the coil operating current and the coil dimensions of the superconducting magnet. This application provides a modular design method for coil electromagnetic design, which facilitates continuous iteration and optimization between different parameter indicators.

A permanent magnet brushless motor, robot joint, a servo actuator, and a robot are provided. The motor is of fractional-slot and inrunner type, including a stator (1) and a rotor (2). The stator (1) includes a stator iron core (10) and a stator winding, the stator winding is a concentrated winding, and the stator iron core (10) has an integral structure. The stator iron core includes a stator yoke and stator teeth, the stator teeth include a plurality of stator teeth (102) protruding from the stator yoke, and the surfaces of the stator teeth (102) are provided with insulating layers. The stator winding comprises a plurality of preset winding coils (11) formed by machine, and each stator tooth is inserted into x winding coils, wherein x is greater than or equal to 1. The rotor (2) comprises a permanent magnet (21) and a permanent magnet carrier (22). The embodiments of the present disclosure can improve a slot fill factor, and optimize an electromagnetic design while ensuring the smooth operation of the meter, thereby improving a per mass motor constant and output power density of the motor.

The invention discloses a one-branch odd-layer stator of a flat wire motor and a stator winding manufacturing method.The one-branch odd-layer stator of the flat wire motor comprises a stator iron core and a stator winding, the stator iron core comprises a stator inner circle and a stator outer circle, Q axially-through stator grooves are evenly formed in the inner circumference of the stator iron core in the circumferential direction, the stator slots are internally provided with slot insulation paper and flat wire windings, each stator slot is internally provided with an odd number of flat wire layers with the layer number of 2n-1, n is an integer greater than or equal to 1, the slot number of each pole and each phase of the stator is q = Q / (2p * m) = 2, Q is the slot number of the stator, p is the pole pair number of the motor, and m is the phase number of the motor; compared with the prior art, through the integral slots with the slot number q of each pole and each phase being 2 and the flat wire layer number 2n-1 being odd layers (n is an integer greater than or equal to 1), the limitation of even layers is broken, the number of turns of the winding is continuously adjustable, and the electromagnetic design freedom degree and the whole machine performance consistency are remarkably improved.

The utility model relates to a motor technology field for washing machine especially a kind of high-speed permanent-magnet motor for washing machine, including stator core, rotor core;The stator core has 12 stator slots, define outer diameter as OD, inner diameter as ID, its split ratio K1=ID / OD, and 0.6≤K1≤0.7;And / or the stator core has 12 first teeth, define first tooth width as W1, its first tooth diameter ratio K2=S*W1 / (π*ID), and 0.36≤K2≤0.46, wherein S is the stator slot quantity.The utility model gives the change relation of motor slot pole ratio, split ratio, tooth diameter ratio, yoke width, magnetic steel slot width, rib width and relevant performance from the angle of electromagnetic design, simultaneously also gives the stator tooth outer edge multi-segment line and rotor tooth outer edge multi-segment line structure design thought, to reach in promoting motor low-speed output torque, high-speed output power while, promote motor efficiency when low speed and high speed respectively, and the purpose of promoting motor anti demagnetization ability.

The invention relates to a flat wire stator assembly containing odd-number-layer windings and a wiring method thereof, the stator assembly comprises a stator core and stator windings, the stator core is provided with a plurality of winding grooves, the stator windings are inserted in the winding grooves, the number of conductor layers in each winding groove is 2n + 1, n is a positive integer, and n is a positive integer. The conductor on the innermost side in each winding groove is the (2n + 1) th layer of conductor, each phase winding comprises at least two branches, and the two branches are connected in series or in parallel. According to the odd-number-layer flat wire stator winding, the electromagnetic design is more flexible, the power and torque requirements of customers can be better met, accurate matching is achieved, allowance is reduced, and the cost is reduced; according to the scheme, the innermost layers of the crown end and the torsion head end of the flat wire stator with odd layers do not intrude into the inner diameter, and shafts can be inserted in the two directions; the crown end is regular in line type, and automatic wire insertion can be realized; and the in-phase slots are uniformly distributed, and the out-phase windings are completely the same, so that the circulating current risk is low.

The invention relates to the field of electromagnetic design and optimization of transformers, in particular to a multi-winding phase-shifting transformer design method based on multi-objective optimization, which comprises the following steps: establishing a model required by multi-objective optimization, constructing a multi-objective optimization model, and setting constraint conditions; an improved NSGA-II algorithm is adopted to solve the multi-objective optimization model; and a Pareto optimal solution set is extracted, and a compromise solution is screened and selected by adopting a TOPSIS method. According to the method, a transformer electromagnetic design theory, a thermal analysis model and an economic cost model are uniformly incorporated into a multi-objective optimization framework, and overall optimization is carried out on design variables such as iron core geometric parameters, winding turn number configuration and wire cross sections; the phase-shifting transformer obtains a Pareto optimal compromise solution set among a plurality of mutually restricted targets such as total loss, material cost, transformation ratio precision, temperature rise margin and the like, and intelligent numerical design of the transformer is realized.

This invention provides an energy-saving motor, a lithium mica ball mill, and a lithium extraction process from lithium mica, relating to the field of energy-saving grinding technology. The invention includes a grinding motor; the output shaft of the grinding motor is keyway connected to a drive gear, and a driven gear is meshed with one side of the drive gear; the grinding motor is electrically equipped with a load sensing module, which includes a current sensor, a torque sensor, and a power sensor; the load sensing module is electrically connected to a controller via wires, and the controller is electrically connected to an actuator via wires. This solution optimizes electromagnetic design and reduces mechanical losses. Grinding load often fluctuates with material hardness and feed rate. The energy-saving motor, combined with an optimized start-up and speed regulation design, exhibits more significant energy-saving effects under light loads. The energy-saving design meets "dual carbon" compliance requirements, reducing corporate carbon emissions, complying with industrial energy-saving renovation policies, and lowering the environmental compliance costs of the grinding production line.

The invention, which relates to the technical field of the permanent-magnet synchronous motor, discloses a rotor weight-reduced permanent-magnet synchronous motor structure comprising a permanent-magnet synchronous motor rotor which is formed by assembling magnetic steel, a rotor punching sheet, a rotor iron core, a shaft body and a shaft key. The weight of the magnetic steel is reduced by adopting a surface-mounted structure during electromagnetic design, the total weight of the rotor punching sheet is further reduced by adopting a radial plate structure, the radial plate structure mainly plays roles in supporting a rotor iron core and transmitting torque in the rotor, the connection strength is ensured by adopting a titanium alloy material, and the connection strength is improved under the condition that the strength is ensured. The middle part of the radial plate structure is processed to realize further weight reduction, and the structural strength of the radial plate structure is verified through software simulation. According to the invention, the overall structural strength of the rotor is increased under the condition that the weight of the rotor is effectively reduced, so that the reliability of the permanent magnet synchronous motor during operation is ensured.

The invention discloses a double-layer spherical self-shielding uniform field coil and a design method, and relates to the field of electromagnetic design. The problems that due to the line width of an existing spherical coil, as the number of turns increases, the actually-machined coil can not meet spherical distribution constraint possibly, and consequently the actual result does not conform to theoretical analysis are solved. The method comprises the following steps: on the basis of a constructed double-layer spherical self-shielding uniform field coil, the magnitude of a magnetic field generated by an ith pair of coils in a space (x, y, z) is calculated according to the Bios-Savart law, and the magnetic field of the double-layer spherical self-shielding uniform field coil is obtained by accumulating the magnetic fields of the coils; describing the uniformity of the magnetic field through a relative error, describing the self-shielding effect of the coil through a ratio, and setting a non-uniform error and an attenuation coefficient constant threshold; a constrained nonlinear multi-objective optimization problem is constructed and is further converted into a single-objective optimization problem through a weighting mode, and optimization calculation is carried out based on a genetic algorithm.

The invention relates to the technical field of permanent magnet motors, and discloses a solving method for the electromagnetic design of a surface-mounted permanent magnet motor with a tooth socket and a computer readable storage medium, and the method comprises the following steps: constructing an equivalent linear motor model through embedding an equivalent current sheet; dividing sub-domains, and establishing a magnetic field equation of each sub-domain including an undetermined coefficient; constructing a coupling equation set according to a physical condition at an interface of adjacent sub-domains, and integrating the coupling equation set into a unified multi-dimensional matrix equation about an undetermined coefficient; iterative solution is carried out based on a sub-domain method and a magnetic circuit method; according to the method, an actual nonlinear stator is converted into a linear stator model, a subdomain method is adopted to carry out refined area modeling and boundary coupling, local magnetic flux distortion and disturbance such as tooth tip saturation and notch magnetic leakage are captured, a closed-loop iteration process is constructed, and the performance parameters of the permanent magnet motor are calculated. Magnetic field changes caused by saturation are dynamically corrected, and it is ensured that key dynamic performance is highly matched with physical reality.

The invention relates to the technical field of motor design methods, in particular to an electromagnetic design method of a special large-air-gap permanent magnet synchronous motor for a pump, which can comprehensively and meticulously understand the performance of the motor in different air gap states by acquiring theoretical calculation values and simulation values of air gap flux density and input power in different air gaps. On the basis, a correction coefficient is calculated, original design parameters are corrected, and finally the motor is designed and manufactured according to the corrected parameters. According to the design method, a simulation technology and a parameter correction thought are combined, and the influence of the air gap change on the motor performance can be accurately optimized. The problem that the performance of the motor is reduced possibly due to air gap adjustment is effectively solved, key performance indexes such as efficiency and power factors of the motor are remarkably improved, the motor is more stable and efficient in the operation process, and the diversified requirements of different application scenes for the performance of the motor are met.

The invention discloses a low-frequency hydro-generator electromagnetic design method, system and device and a medium, and the method comprises the steps: selecting the main dimensions of a plurality of low-frequency hydro-generators, the main dimensions of the low-frequency hydro-generators comprising the stator inner diameter D and the equivalent length l'of a stator core; calculating the number of turns of a stator winding corresponding to the main size of each low-frequency hydro-generator, the stator size of the low-frequency hydro-generator, the rotor size of the low-frequency hydro-generator and the number of turns of an excitation winding on a rotor salient pole so as to form a plurality of electromagnetic design schemes of the low-frequency hydro-generator; and performing simulation verification on each low-frequency hydraulic generator electromagnetic design scheme by using the low-frequency hydraulic generator electromagnetic simulation verification model to obtain electrical parameters of each low-frequency hydraulic generator electromagnetic design scheme, and outputting the low-frequency hydraulic generator electromagnetic design scheme meeting preset electrical parameter requirements as a final design result. The method, the system, the equipment and the medium can realize the electromagnetic design of the low-frequency hydro-generator.

The invention discloses a method for avoiding noise caused by slot matching, relates to the technical field of asynchronous induction motors, and aims to solve the problem that an asynchronous motor proposed in the background technology does not have slot matching suitable for any capacity due to the diversity of slot matching, the inherent frequency of a stator and the diversity of force waves. In order to avoid the problem that electromagnetic noise caused by slot matching brings huge loss to a motor manufacturer, the invention provides the following scheme: the method comprises the following steps: S1, carrying out electromagnetic design according to parameters of an asynchronous motor, and designing slot types of a stator and a rotor corresponding to the parameters; s2, performing simulation test on force waves in an air gap magnetic field of the motor according to the designed stator and rotor, performing statistical analysis on simulation test results, and determining the strength, order and frequency of radial force waves in an air gap. According to the diversity of the slot matching of the asynchronous motor and the diversity of the inherent frequency and the force wave of the corresponding stator, the appropriate slot matching can be calculated in time, and the motor is prevented from generating noise.

The invention relates to an energy efficiency-time collaborative optimization design method for a servo permanent magnet synchronous motor, and belongs to the technical field of servo motor system design and control. The method comprises the following steps: setting a target working condition, and setting periodic energy consumption and a shortest time target according to long-time scanning and short-time fast response working conditions; ontology optimization: based on a target trajectory and an energy consumption model, establishing a finite element optimization sample by adopting optimal Latin hypercube sampling, and solving a local optimal design scheme through a numerical agent model and an evolutionary algorithm; trajectory optimization: constructing a cost function based on a local optimal design scheme, taking a 9-degree polynomial as a trajectory function, and solving an energy optimal trajectory under constraint by adopting sequence least square programming; and setting a termination criterion, and carrying out collaborative iteration by taking the energy optimal trajectory as a new target trajectory until the energy consumption reduction percentage is lower than a set value. According to the method, the global optimal combination scheme of the SPMSM electromagnetic design and the energy optimal trajectory is obtained under the condition of considering the positioning time through the collaborative iteration of the body and the trajectory.

The invention provides a rapid calculation method for the temperature rise of a transformer coil, and relates to the technical field of high-voltage power transmission and distribution. Comprising the following steps: determining electromagnetic design parameters and structural design parameters of the liquid-immersed transformer; according to the structural design parameters, performing two-dimensional equivalent processing on the liquid-immersed transformer to construct a corresponding numerical calculation model; calculating loss distribution at the preset temperature according to the numerical calculation model; calculating the corresponding heat source density according to the loss distribution; calculating temperature distribution of the coil according to the heat source density and a fluid-solid coupling method; establishing a thermal circuit model of the flowing-out transformer body oil temperature and the flowing-in transformer body oil temperature of the liquid-immersed transformer; solving the thermal circuit model to obtain the oil temperature of the input coil; adjusting the temperature distribution of the coil according to the input oil temperature of the coil to obtain the adjusted temperature distribution of the coil; and coil temperature extraction is carried out according to the coil temperature distribution, and the extracted temperature is obtained and convergence judgment is carried out. The problems that a numerical calculation method is high in calculation duration and low in precision are solved.

The invention discloses an electromagnetic design method of a phase modifier. According to an existing design method, performance parameter comparison needs to be carried out in the final stage of the design process after a large amount of calculation, design optimization work is started, the size of a phase modifier is adjusted for recalculation, a satisfactory result can be achieved only by repeated calculation for multiple times, the design calculation workload is large, and the efficiency is low. According to the method, performance index requirements serve as parameters in the design process instead of being only used for judging threshold values of design results, that is, design values such as the main size of the phase modifier are solved according to the requirements of performance indexes of the phase modifier, such as direct-axis sub-transient reactance, direct-axis transient reactance, direct-axis transient short-circuit time constant and direct-axis transient open-circuit time constant; and related performance indexes of the designed phase modifier are ensured to meet or be superior to requirements, and the electromagnetic design working efficiency of the phase modifier is improved.

The invention provides a dust collector motor, which belongs to the technical field of motors and comprises an electric driver, a stator assembly, a rotating shaft and a rotor assembly, the rotor assembly is arranged on the rotating shaft, the stator assembly is arranged on the outer side of the rotor assembly, and the electric driver is arranged on the outer side of the stator assembly. On the basis of the ultra-high-speed motor, the load coupling influence of the dust collector is considered during electromagnetic design through multi-target optimal parameters, the rotating speed of the core brushless motor is extremely high and can provide strong suction force, and the rotating speed of the ultra-high-speed motor can reach 190000 revolutions per minute, so that the dust collector has excellent performance in the aspects of cleaning dust, sundries and the like. Power support is provided for cleaning of multiple scenes such as the ground, beds, narrow slits and table tops of a whole house, and particle chippings and tiny dust can be rapidly and thoroughly sucked.

The invention provides an energy-saving motor, lepidolite ball-milling equipment and a process for extracting lithium from lepidolite, and relates to the technical field of energy-saving grinding. A key groove of an output shaft of the grinding motor is connected with a driving gear, and one side of the driving gear is connected with a driven gear in an engaged mode. And a load sensing module is electrically installed on the grinding motor, a current sensor, a torque sensor and a power sensor are arranged in the load sensing module, the load sensing module is electrically connected with a controller through a wire, and the controller is electrically connected with an executing mechanism through a wire. According to the scheme, electromagnetic design is optimized, mechanical loss is reduced, grinding load often fluctuates along with material hardness and feeding amount, energy-saving motor matching optimization starting is combined with speed regulation design, the energy-saving effect is more prominent during light load, the energy-saving design can meet the double-carbon compliance requirement, enterprise carbon emission can be reduced, the industrial energy-saving modification policy is met, and the energy-saving effect is better. And the environment-friendly compliance cost of the grinding production line is reduced.

The invention relates to a portable superconducting magnetic resonance imaging system, which is characterized in that a superconducting magnet adopts a super-shielding electromagnetic design, a 5-gauss line range is compressed to be close to a magnet vacuum container, a superconducting magnet coil supporting structure adopts an integrated design, the mass of the supporting structure is effectively reduced, a superconducting magnet coil is wound by magnesium diboride, and the magnetic resonance imaging effect is improved. Closed-loop operation is achieved through the superconducting joint technology, the superconducting magnet low-temperature system conducts and cools a superconducting magnet coil through a Stirling cryocooler, and additional compressor equipment is not needed. The gradient device adopts an asymmetric stepped design and can accommodate the shoulders of the patient to enter. The horizontal superconducting magnet structure supports the use of a multi-channel parallel emission radio frequency coil. The superconducting magnet, the gradient device, the radio frequency coil and the cabinet are placed on a movable frame, and the frame can pull and hang the examination bed. According to the invention, the portable examination of the super-reach magnetic resonance imaging system is realized.

The invention provides a chain saw motor, and belongs to the technical field of motors, the chain saw motor comprises a shell, a rotating shaft, a rotor assembly, an electric driver, a stator assembly and a connecting piece, the shell is fixed on the rotating shaft, the rotor assembly is arranged in the shell, the electric driver is arranged in the rotor assembly, the stator assembly is arranged in the electric driver, and the connecting piece is connected with the stator assembly. On the basis of the outer rotor large-torque motor, the load coupling influence of the chain saw is considered during electromagnetic design through multi-target optimal parameters, the core outer rotor large-torque motor can provide strong torque, the maximum torque can reach 4 N.m, the cutting task of thick and large trunks, thick and heavy wood and the like can be easily coped with, and the working efficiency is greatly improved.

The invention provides an electromagnetic design method of an outer rotor direct drive motor, a storage medium and electronic equipment, and the method comprises the steps: determining the structure parameters of a stator core and the structure parameters of a rotor core, the parameters comprise the number of winding grooves on the stator core, the number of poles, the arrangement mode of two adjacent winding grooves, the winding form in each winding groove, the number of skewed pole sections of skewed pole magnetic steel of the rotor core, the skewed pole angle of each section and the number of magnetic steel sections. And constructing a motor model according to the parameters, and simulating the motor model after the motor model is obtained. If the output information of the motor model reaches the driving output standard of the automobile power system, electromagnetic design is completed, otherwise, after the structural parameters of the stator core and / or the structural parameters of the rotor core are adjusted, the motor model is reconstructed, and analog simulation is conducted till the output information of the motor model reaches the driving output standard of the automobile power system. According to the scheme, the motor electromagnetic design scheme meeting the automobile driving output standard is directly obtained, and a speed reducer does not need to be arranged.

The invention provides a built-in permanent magnet synchronous motor no-load magnetic field acquisition method, system and device and a medium, and belongs to the technical field of permanent magnet synchronous motor magnetic field analysis. The method comprises the following steps: dividing a built-in motor structure into sub-domains, including stator slots, stator notches, air gaps, magnetic isolation bridges and rotor slots; obtaining a general solution expression of vector magnetic potential in each sub-domain by adopting a variable separation method in combination with structural parameters of each sub-domain; establishing boundary conditions of adjacent sub-domains, and calculating to obtain vector magnetic potential in each sub-domain according to the boundary conditions; and calculating a no-load magnetic field of the motor based on the vector magnetic potential in each sub-domain. According to the method, the no-load magnetic field of the motor can be quickly and accurately calculated, and the calculation time is greatly shortened compared with finite element simulation; meanwhile, the method can be combined with an advanced optimization algorithm, so that the method is suitable for rapid optimization design of the motor. Convenience is provided for motor magnetic field calculation and electromagnetic parameter calculation, and an effective means is provided for electromagnetic design of the permanent magnet synchronous motor.

The present invention relates to the technical field of motor design methods, specifically an electromagnetic design method for a special large-gap permanent magnet synchronous motor for pumps. By obtaining the theoretical calculated values ​​and simulation values ​​of the air gap magnetic flux density and input power under different air gaps, the performance of the motor under different air gap conditions can be fully and carefully understood. On this basis, the correction coefficient is calculated, and then the original design parameters are corrected, and finally the motor is designed and manufactured according to the corrected parameters. This design method combines the simulation technology and the idea of ​​parameter correction, and can accurately optimize the impact of air gap changes on motor performance. It effectively solves the problem of motor performance degradation that may be caused by air gap adjustment, significantly improves key performance indicators such as motor efficiency and power factor, makes the motor more stable and efficient during operation, and meets the diverse needs of motor performance in different application scenarios.

The present invention discloses a design method for a long-stator linear synchronous motor powered by a voltage source. The method includes: using sinusoidal currents under two working conditions as stator three-phase winding excitation, obtaining three-phase inductance and rotor excitation flux, then inputting the established three-phase current recursive model for processing and outputting the first steady-state three-phase current as three-phase winding current excitation, obtaining three-phase voltage, and simultaneously obtaining a voltage difference according to the expected value of the three-phase voltage and inputting the model for processing and outputting the second steady-state three-phase current as current source excitation, and obtaining the electromagnetic performance under square wave voltage conditions according to the finite element simulation model, thereby determining the optimal motor structural parameters to design the long-stator linear synchronous motor. The method of the present invention can quickly and accurately obtain the steady-state electromagnetic performance of the motor under voltage source power supply, and then design the long-stator linear synchronous motor, and can be applied to the electromagnetic design of other different types of three-phase synchronous motors under voltage source simulation conditions.

The invention provides an electromagnetic design analysis method and system for a pulse coaxial coil system of an FRC device, a computer readable storage medium and electronic equipment. The electromagnetic design analysis method comprises the steps that target physical requirement parameters of the coaxial coil system are acquired; establishing a parameter calculation model, wherein the model comprises a simplified analysis formula group used for describing a mapping relation between the target physical demand parameter and the power supply key electrical parameter; based on the parameter calculation model, parameter space scanning is carried out with the number N of the coils as a variable, and a parameter space scanning graph at least containing the maximum current Imax, the maximum voltage Umax and the maximum current change rate di / dtmax changing along with the number N of the coils is generated; obtaining a key performance parameter threshold value of the solid-state switching device, and performing comparative analysis on the parameter space scanning graph and the key performance parameter threshold value; and determining the number N of coils meeting the performance parameter constraint of the solid-state switching device according to the comparison and analysis result. According to the method, the calculation amount is greatly simplified, so that the efficiency of forward design and engineering analysis of the system is improved.