83 results about "Winding loss" patented technology

The invention provides a power transformer electromagnetic loss control method and device in an intelligent power grid environment, and relates to the field of intelligent power grids, and the method comprises the steps: carrying out the cooling demand prediction of a transformer according to a predicted power load sequence and a space temperature sequence, and outputting a predicted cooling load sequence; and with meeting of the predicted cooling load sequence as a constraint and minimization of energy consumption and oil temperature fluctuation as optimization targets, cooling parameters of the forced oil cooling device are optimized, an optimal cooling parameter sequence is output, and the forced oil cooling device is controlled to dissipate heat of the transformer. The method aims to solve the technical problems that a traditional control method lacks cooling strategy dynamic adjustment capacity, temperature rise abnormity is prone to occurring in a high-load or high-temperature environment, transformer iron core loss and winding loss are remarkably increased, and electromagnetic loss is high, accurate and efficient cooling control can be achieved, the electromagnetic loss is effectively reduced, and the service life of a transformer is prolonged. And the operation efficiency and stability of the transformer are improved.

The invention relates to the technical field of electrical performance testing, in particular to a method and system for measuring loss of an inductance winding, and the method comprises the following steps: applying a direct current to a measured inductance winding, synchronously monitoring the temperature, and multiplying a pre-measured direct current resistance value by a direct current value to obtain a direct current loss power value. The direct current is applied to the inductance winding, the temperature is monitored synchronously, the direct-current loss power is obtained by combining the direct-current resistance value and the current value, the temperature curve in the initial stage is extracted, the temperature rise rate is calculated, and therefore the winding heat capacity parameter is obtained, loss measurement can be closely associated with thermal response, and the measurement accuracy is improved. Introduction of a heat capacity factor is added in loss calculation, dynamic characteristics of a winding material on a thermodynamic level can be reflected, instantaneous current with load step change is applied after an inductor is cooled, an instantaneous loss power curve is generated by collecting a voltage sequence and a current sequence at the same time, and loss calculation is not limited to average value or steady state measurement any more.

The invention provides a transformer simulation method and system based on multi-physics field coupling, and the method comprises the steps: building a transformer simulation grid model according to the geometric dimension parameters of a transformer; fitting to obtain a nonlinear change curve of the material parameters along with the temperature based on the change rule of the related parameters of the transformer related material along with the temperature at different temperatures; transformer electromagnetic simulation is carried out, a transformer heat source is calculated, iron core loss and winding loss of silicon steel laminations are solved, loss generated by a transformer iron core and a winding is used as a heat source of temperature-flow field coupling, and distribution of a temperature field and a flow field in the transformer is determined; and mapping the distribution of the temperature field and the flow field in the transformer and the nonlinear change curve of the transformer material into the constructed transformer simulation grid model to realize deep coupling. The practical operation condition of the transformer can be effectively simulated, guidance is provided for safe and stable operation of the transformer, and safe and stable operation of the transformer is guaranteed.

The invention relates to a torque motor which comprises a stator and a rotor which are separated by a single-layer air gap. The stator comprises a stator iron core, a stator concentrated winding and stator permanent magnets, the stator iron core is composed of stator teeth and a stator yoke, the stator concentrated winding is wound on the stator teeth, and a plurality of stator permanent magnets are embedded in the surface, close to the single-layer air gap, of each stator tooth; the rotor comprises a rotor iron core, a rotor concentrated winding and rotor permanent magnets, the rotor iron core is composed of rotor teeth and a rotor yoke, the rotor concentrated winding is wound on the rotor teeth, and a plurality of rotor permanent magnets are embedded in the surface, close to the single-layer air gap, of each rotor tooth; the magnetizing directions of all the stator permanent magnets are the same, and the magnetizing directions of all the rotor permanent magnets are the same. The number of pole pairs of the permanent magnets of the torque motor is large, the magnetic field modulation effect can be fully utilized to generate torque, the magnetic pole structure of the consequent poles can reduce the number of the permanent magnets, the concentrated winding is adopted to reduce the loss and volume of the end winding, and the torque density and the permanent magnet utilization rate are improved.

The invention relates to a semi-analytical calculation method for loss of a Litz wire winding of a high-frequency transformer, and the method comprises the steps: extracting equivalent electromagnetic parameters of a single-turn Litz wire through finite element simulation software, taking the equivalent electromagnetic parameters as the calculation premise of an AC resistance coefficient of a homogenized Litz wire winding, and accurately improving the calculation precision for a complex Litz wire winding. Compared with three-dimensional finite element simulation, the method has the advantages that calculation speed is increased and calculation power resources are saved while calculation precision is considered, so that calculation support is provided for prediction of winding loss in subsequent optimization design of the high-power high-frequency transformer; the technical problem that in the prior art, it is difficult to balance the balance between the calculation precision and the speed due to the complex multi-strand structure of the litz wire is solved.

The invention discloses a transformer direct current magnetic bias temperature rise calculation method, system, medium and equipment, and the method comprises the steps: carrying out the classification estimation of the non-linear magnetic resistance value of each part of an iron core structure based on the magnetization characteristic of an iron core material, and obtaining the magnetic resistance estimation value of each part; building a transformer iron core magnetic circuit simulation model according to the magnetic resistance estimated value of each part to obtain a saturation magnetization characteristic phi-i curve of the transformer; a transformer circuit-magnetic circuit model is built, and winding current and iron core magnetic flux are obtained through circuit and magnetic circuit coupling calculation; establishing a transformer thermal circuit lumped parameter model under the direct current magnetic bias condition based on a thermoelectric analogy method, and fitting thermal capacity and thermal resistance parameters in the transformer thermal circuit lumped parameter model according to data of a transformer temperature rise experiment; in combination with short-circuit test data of the transformer, calculating winding loss of the transformer under direct-current magnetic bias; based on the BP loss characteristic of the iron core material, calculating the iron core loss of the transformer under the direct current magnetic bias; and temperature rise is calculated based on the transformer thermal circuit lumped parameter model.

The application discloses a flyback transformer winding loss evaluation method, device, equipment and storage medium, and the method comprises the following steps: acquiring electrical data in a preset switching period, and actual primary side current waveform and actual secondary side current waveform of a to-be-tested flyback transformer under the electrical data, and constructing a current calculation model to obtain a primary side current change function and a secondary side current change function; then, the primary side current change function and the secondary side current change function are subjected to Fourier decomposition to obtain a primary side DC component, a primary side harmonic component, a secondary side DC component and a secondary side harmonic component; then, selected primary side harmonic components, selected primary side harmonic frequencies, selected secondary side harmonic components and selected secondary side harmonic frequencies are determined; subsequently, the primary side AC resistance, the primary side DC resistance, the secondary side AC resistance and the secondary side DC resistance of the flyback transformer are acquired; finally, the winding loss value of the to-be-tested flyback transformer is calculated. Through implementation of the application, the winding loss of the flyback transformer can be quantitatively calculated.

The application belongs to the field of transformers, and discloses a linear phase-shifting transformer equivalent circuit modeling and performance parameter obtaining method, analyzes the electromagnetic relationship between the primary side winding and the air gap when the linear phase-shifting transformer is in steady-state operation, and Maxwell equations of the linear phase-shifting transformer; based on the theory of one-dimensional field, the equivalent circuit of the linear phase-shifting transformer is established and solved when the longitudinal edge effect is considered. The performance parameter obtaining method is also disclosed, which comprises: solving the established equivalent circuit model to obtain the resistance and leakage reactance of the primary side winding, the excitation reactance, and the secondary side winding resistance; and calculating the performance parameters of the linear phase-shifting transformer based on the equivalent circuit solving result. The application considers the actual situation of the transformer in electromagnetic analysis, the model is more accurate, the calculation precision is high, the winding loss, efficiency and voltage regulation rate and other performance parameters of the transformer can be quickly and effectively calculated, the application is relatively convenient in actual calculation and analysis, and has high practical value.

The invention discloses a coreless transformer coil which comprises a coil body, the wire width of each turn of the coil body is different, and the distance between every two adjacent turns is determined through simulation, so that the self-inductance loss of the coil body is minimum. The invention also discloses an optimal design method of the coreless transformer coil, which at least comprises the following steps: step 1, constructing a first coil with equal line width and equal spacing, the first coil being a coreless transformer coil; 2, Maxwell simulation software is used for simulating the first coil, under the condition that the magnetic field intensity of the first coil is kept unchanged, the optimal line width value is found out, the optimal line width value refers to the line width when the winding loss of the first coil is minimum, and a second coil with the equal line width and the equal interval is constructed with the optimal line width value as the line width; and step 3, keeping the inner diameter and the outer diameter of the second coil unchanged, setting the wire width of each turn of the second coil to be different values, and performing simulation to obtain a third coil. The high-frequency loss of the coreless transformer coil can be effectively reduced.

The invention discloses a transformer winding loss calculation method and a related device. The method comprises the steps of obtaining harmonic current of an environment where a transformer winding is located; calculating the AC resistance of the transformer winding according to the harmonic current through a skin effect and a proximity effect; acquiring a non-sine-wave current of an environment where the transformer winding is located, and decomposing the non-sine-wave current into a plurality of harmonic components; after the height of the transformer winding is adjusted to be equal to the height of the magnetic core window based on a preset transformer winding design method, the frequency of each harmonic component is calculated, and the total winding loss is calculated according to the frequency of the harmonic component and the alternating-current resistance. By optimizing the structure of the winding and the loss calculation method, the operation efficiency and reliability of the medium-frequency transformer are effectively improved, and energy loss caused by the high-frequency electromagnetic effect is reduced. Therefore, the problems of loss increase caused by inaccurate winding loss calculation and winding height mismatching in a high-frequency environment and complex loss caused by harmonic current in the prior art are solved.

This invention proposes a multi-physics field optimization design method and system for large-capacity high-frequency transformers, belonging to the technical field of high-frequency transformers. The method includes: establishing optimization targets for high-frequency transformer cost, power density, and efficiency based on the application requirements of the high-frequency transformer; introducing calculation models for core loss and winding loss based on these optimization targets to obtain the loss of the high-frequency transformer; introducing a core size constraint based on the maximum feasible size of the high-frequency transformer core and thermal and electromagnetic constraints; optimizing the high-frequency transformer design based on the core size constraint using the Taguchi method; and performing a Pareto front relationship analysis on the optimized high-frequency transformer using a selective non-dominated genetic algorithm to obtain the optimal design solution for the high-frequency transformer. This method can effectively address the comprehensive optimization needs of multiple physical fields.

The utility model relates to the technical field of motors, and provides a stator punching sheet, a stator core, a motor, a compressor and refrigeration equipment, and the stator punching sheet comprises a stator yoke part which is made of a non-oriented silicon steel sheet; the plurality of stator slots are arranged on the inner circumferential surface of the stator yoke part, the notches of the stator slots face the circle center direction of the stator yoke part, and a mounting slot is formed between any two adjacent stator slots; the stator teeth are made of oriented silicon steel sheets, and each stator tooth is correspondingly inserted and mounted in one mounting groove; the groove structure is arranged on the outer circumferential surface of the stator yoke part, the groove structure comprises a first groove and a second groove, and the second groove is located in the center line direction of the first groove in the radial section of the stator yoke part. By adopting the stator yoke part of the non-oriented silicon steel sheet and the stator teeth of the oriented silicon steel sheet, the groove area of the stator groove is increased, and the winding loss is reduced; by optimizing the layout of the groove structure, the width of the stator yoke part and the overload capacity of the motor are improved.

The invention discloses a transformer structure for reducing eddy current loss of a fractional turn LLC magnetic core, which comprises a bottom plate, a central magnetic column is arranged on the bottom plate, four side magnetic columns are sequentially arranged on the outer side of the bottom plate along the circumferential direction, the four side magnetic columns are used as a loop of magnetic flux generated by the central magnetic column, the central magnetic column is elliptical, and the central magnetic column is cylindrical. A primary winding and a secondary winding are wound on the central magnetic column. The transformer structure is low in winding loss.

This invention belongs to the field of simulation calculation technology, specifically relating to a simulation calculation method for temperature rise of oil-immersed distribution transformers under photovoltaic harmonic current. The steps include: constructing a photovoltaic grid-connected current model to obtain current waveforms under different distortion rates, and performing frequency domain decomposition to obtain the harmonic current components; establishing a geometric model of the oil-immersed distribution transformer; setting the number of turns and electromagnetic field boundary conditions for the high-voltage and low-voltage windings; constructing a transformer circuit diagram and coupling it to the electromagnetic field of the geometric model; solving for winding losses and core losses of the high-voltage and low-voltage windings under different harmonic current components; meshing the thermal structure and setting boundary conditions for the temperature field; using winding losses and core losses as equivalent heat sources and employing a steady-state solver to obtain the temperature distribution results of the oil-immersed distribution transformer under different distortion rates. This invention can improve the accuracy of temperature rise calculation and also provide an optimization basis for transformer design.

The application discloses a kind of converter transformer winding temperature monitoring method, device, equipment and medium, it is related to power transformer technical field, comprising the following steps: establishing the two-dimensional equivalent electromagnetic model of converter transformer, and electromagnetic simulation is carried out, obtain winding loss;Winding loss is as the heat source of two-dimensional flow-temperature field of two-dimensional equivalent flow-temperature model to two-dimensional equivalent flow-temperature model carries out fluid-temperature field simulation;With inlet oil temperature, inlet flow and ambient temperature as input variable, net side hot spot temperature, net side average temperature, valve side hot spot temperature and valve side average temperature as output value, construct linear regression model;Fine tuning model is constructed, linear regression model is combined with fine tuning model, obtain hybrid model.The application is with multiple independent variables as input, with winding hot spot and average temperature as output to establish the basic model based on linear regression and the fine tuning model with the error of winding hot spot and average temperature as output, and the two are combined to obtain hybrid model, the output result of the hybrid model can be with higher precision approximate simulation result, greatly improve the precision of winding temperature calculation.

The application discloses a planar transformer integrated structure of a current-doubler rectifier converter, which comprises a PCB board, a first transformer magnetic core, a second transformer magnetic core, a primary integrated winding, K first transformer secondary windings, K second transformer secondary windings and 2K rectifier unit circuits, wherein K is a natural number not less than 2; the first transformer magnetic core comprises a magnetic core bottom and a magnetic core top, a protruding middle column is arranged in the middle of the magnetic core bottom, K protruding edge columns are arranged around the middle column, the middle column passes through the middle of the PCB board, the edge columns pass through the outer edges of the PCB board, and the middle column and the edge columns are in contact with the magnetic core top; the second transformer magnetic core is symmetrical with the first transformer magnetic core in structure; the primary integrated winding is printed on a first surface of the PCB board, the secondary windings are printed on a second surface of the PCB board, and each secondary winding is arranged between the middle column and one edge column; and each secondary winding is connected to a planar transformer output end through a rectifier unit circuit. The application has low winding loss, high power density and high efficiency.

The application discloses a high-temperature environment magnetic suspension motor heat protection method, obtains the armature winding loss, excitation winding loss and core loss of the magnetic suspension motor under the rated working condition; based on the component loss and the corresponding volume, calculates the heat generation rate of each component, and establishes a temperature field mathematical model containing the heat conduction coefficient and the convective heat transfer coefficient; according to the temperature field mathematical model, the node temperature set of the whole magnetic suspension motor is determined, and the node temperature set is divided into temperature intervals; when the highest temperature is higher than the preset safety threshold, the arrangement parameters of the cooling channel are adjusted, and the simulation and adjustment are repeatedly executed until the highest temperature is below the preset safety threshold, and the heat protection is completed. The application verifies the highest temperature through the temperature field simulation, if the highest temperature exceeds the preset safety threshold, the arrangement parameters of the cooling channel are dynamically adjusted and iteratively optimized until the temperature control requirement is met, so that the key components of the motor are effectively prevented from over-temperature under the high-temperature environment.

The application discloses a four-phase different-name end coupling magnetic integrated inductor, which comprises an upper cover plate, a lower cover plate, four magnetic columns and four windings; the upper cover plate and the lower cover plate are of the same shape, and the four magnetic columns are of the same shape; the four magnetic columns are uniformly distributed in a horizontal direction around a vertical connecting line of a center point of the upper cover plate and a center point of the lower cover plate; the upper cover plate covers upper surfaces of the four magnetic columns, and the lower cover plate covers lower surfaces of the four magnetic columns; the four-phase different-name end coupling magnetic integrated inductor further comprises a partition air gap; the four windings are of the same structure and are wound on the four magnetic columns respectively to form four-phase inductors which are magnetically coupled; after current excitation is applied to the four windings, magnetic fluxes generated in the four magnetic columns are of the same direction. The four-phase winding different-name end coupling makes the magnetic fluxes generated in the upper cover plate of the magnetic core and the lower cover plate of the magnetic core have the same direction, so that the four-phase inductors can be reduced to a certain extent. The four-phase different-name end coupling magnetic integrated inductor is favorable for reducing inductance current ripple and in turn reducing winding loss, and can improve current uniformity and rated value of the four-phase inductors.

The present invention relates to the field of winding loss measurement technology, and discloses a method and system for measuring the winding loss of an inductor, comprising: partitioning the inductor winding to obtain partitioned windings, and setting an initial filling factor of the partitioned windings; after inputting an excitation current into the inductor winding, using a factor detection tool to measure factor-related parameters of the partitioned windings, and using a winding detection tool to measure winding-related parameters of the partitioned windings; based on the factor-related parameters, analyzing the single deformation area of ​​a single wire in the inductor winding, performing wire accumulation processing on the single deformation area, and converting the initial filling factor into a dynamic filling factor through the single-zone deformation area; analyzing the initial eddy current loss of the partitioned winding, dynamically adjusting the initial eddy current loss using the dynamic filling factor to obtain dynamic eddy current loss, and determining the final eddy current loss of the inductor winding through the dynamic eddy current loss. The present invention can take into account both measurement accuracy and measurement simplicity.

The invention discloses distribution transformer winding material detection equipment and system based on high-frequency excitation. The detection equipment comprises a calculation display unit, an electric energy quality analysis unit, a power amplification unit and a harmonic signal generation unit, the system establishment of the detection equipment specifically comprises the following steps: summarizing the size relationship between the copper transformer and the aluminum transformer; verifying a skin effect and a proximity effect of the coil assembly; the influence rule of frequency, conductor size and winding structure on resistance and loss is researched; constructing an overall model of the transformer; analyzing loss and hysteresis phase differences of copper and dissimilar windings; and establishing a pure copper standard parameter library. The method has the beneficial effects that environmental interference is effectively inhibited, and the detection stability is greatly improved; complete nondestructive testing is achieved, and winding and insulation safety is guaranteed; the identification accuracy and the composite material identification capability are improved; the equipment contains a standard comparison library, supports automatic and standardized detection, and is convenient for field application and popularization.

The utility model discloses a flat wire hub motor, and relates to the field of electric vehicle hub motors, the flat wire hub motor comprises a rotor assembly and a flat wire stator assembly, the rotor assembly comprises a hub arranged on the outermost ring, a plurality of magnetic steels are uniformly arranged on the inner wall of the hub, two ends of the hub are respectively provided with a magnetic conductive ring, and the magnetic conductive rings are arranged on the periphery of the hub. The magnetic conductive rings are located at the edges of the two ends of the magnetic steel, and the flat wire stator assembly is arranged in the rotor assembly. One end of the motor support is provided with a disc brake end cover, the other end of the motor support is provided with an end cover, and the surface of the end cover is provided with an outgoing line. By adopting the flat wire hub motor stator structure, the slot fullness rate of the motor can be improved, the current density can be reduced, the overload capacity of the motor can be improved, the temperature rise can be reduced, and the explosive power of an electric vehicle can be improved. According to the utility model, the slot fullness rate and the winding rigidity can be improved, thereby reducing the winding loss, reducing the temperature rise of the motor, improving the explosive power of the motor and reducing the vibration noise.

The invention discloses a magnetic core structure and an anti-DC bias inductor. The magnetic core structure comprises a main magnetic core, an auxiliary magnetic core and a short circuit ring, the main magnetic core forms a main magnetic circuit through a wound main winding; the auxiliary magnetic core bypass is arranged on the main magnetic core, the short circuit ring is arranged on the auxiliary magnetic core and used for isolating alternating-current magnetic flux of the main magnetic circuit, and then the auxiliary magnetic core forms a direct-current magnetic circuit for shunting direct-current magnetic flux in the main magnetic circuit through the short circuit ring. The anti-DC bias inductor comprises the magnetic core structure. The beneficial effects of the application are that through the bypass DC magnetic circuit, the attenuation effect of the DC bias on the magnetic conductivity of the power inductor can be effectively reduced, the effect of achieving a high increment inductance value with a small number of turns is achieved, the DC winding loss of the power inductor can be directly reduced, and the loss of the power inductor can be reduced. The reduced inductance ripples can also reduce winding loss and magnetic core loss, so that the temperature rise of the inductor can be improved. And the direct-current magnetic circuit basically does not increase magnetic core loss, and temperature rise control is facilitated.

The invention discloses a flat wire motor conductor size and stator slot height optimization method based on electromagnetic thermal coupling analysis. The method comprises the following steps: establishing a motor electromagnetic field and temperature field simplified model, parameterizing motor basic data, and setting an optimization interval of the conductor size and the stator slot height; calculating stator winding loss through iterative electromagnetic field simulation by taking the average torque as a constraint condition, inputting alternating current loss as a heat source into a temperature field for simulation, and updating material parameters until the temperature is converged; and finally, selecting a scheme with the minimum alternating current loss as an optimization result. According to the method, the calculation efficiency is improved through equivalent conductor model simplified analysis and convergence tolerance setting, multi-parameter collaborative optimization is achieved through the genetic algorithm, temperature distribution under the actual working condition can be accurately predicted, alternating current loss is effectively reduced, and an efficient and reliable optimization means is provided for design of the high-speed permanent magnet synchronous motor.

The utility model discloses a motor, compressor and refrigeration equipment relates to motor technical field, the motor includes stator subassembly and rotor, the stator subassembly includes stator, insulating layer and a plurality of windings, stator has a plurality of winding slots that are distributed along its circumference at intervals, insulating layer is provided on the inner wall of winding slot, and the winding slot is provided with a plurality of windings. The stator comprises a plurality of stator units which are arranged at intervals in the circumferential direction of the stator; the cross sectional area of each winding groove is S1 (mm < 2 >), the cross sectional area of each insulating layer is S2 (mm < 2 >), the outer diameter of each turn of wire of each winding is D (mm), the total number of turns of the windings in each winding groove is N, the maximum rotating speed of the motor is Nmax (rps), 0.7 < = N * D2 / (S1-S2) < = 0.95, and when the sufficiently high filling rate is ensured, the groove utilization rate is improved, the resistance is reduced, the winding difficulty is avoided, 125 rps < = Nmax < = 165 rps, the rotating speed of the motor of the compressor is increased, and the service life of the compressor is prolonged. The same cooling capacity can be achieved, and the displacement of the compressor is reduced, so that the current of the compressor is reduced, the winding loss of the motor is reduced, and the energy efficiency is improved.

The invention discloses a high-frequency transformer winding loss calculation method based on finite element and eddy current loss characteristics, and the method comprises the following steps: 1, building a model of a Helmholtz coil and a single winding through finite element software, and simulating an alternating magnetic field in a high-frequency transformer through the Helmholtz coil; 2, changing the magnetic field frequency, and recording the eddy current loss of a single winding of the high-frequency transformer at different frequencies of a Helmholtz coil; step 3, an eddy-current loss correction factor between different frequencies is calculated by using an eddy-current loss characteristic formula; 4, the eddy-current loss generated in the high-frequency transformer winding is calculated by using the eddy-current loss factor, and comparison verification is carried out by using a traditional formula method; 5, adding the eddy current loss to the direct current loss of the high-frequency transformer winding to obtain the total winding loss of the high-frequency transformer; the method solves the problem that a common eddy current factor method is not high in calculation precision.

The invention provides an optimization method of a magnetic flux leakage voltage stabilizing transformer, a medium, equipment and a product, and relates to the technical field of optimization of magnetic flux leakage transformers, and the method comprises the steps: obtaining a related parameter set of the magnetic flux leakage voltage stabilizing transformer, comprise the geometric dimension of an iron core, the number of turns and the wire diameter of a primary side winding, the number of turns and the wire diameter of a secondary side high-voltage winding, the number of turns and the wire diameter of a secondary side low-voltage winding, the total weight of the iron core, the total weight of the windings, iron core loss, winding loss, primary side leakage inductance and no-load saturation magnetic flux density; setting an objective function to minimize the total cost and the total loss, obtaining an optimization variable from the related parameter set, setting a boundary constraint condition of the optimization variable, and constructing an optimization model of the magnetic flux leakage voltage stabilizing transformer according to the objective function, the boundary constraint condition and the optimization variable; and solving the optimization model to obtain an optimal design parameter set of the magnetic flux leakage voltage stabilizing transformer. The method is simple in calculation process, easy to program and implement, small in experience dependence and more accurate in calculation result.

The application relates to the technical field of transformers, and discloses a loss optimization method and system for a solid-state transformer Litz wire winding. The method comprises the following steps: collecting a non-sinusoidal wave excitation signal, performing Fourier transform to obtain a frequency spectrum, and determining distribution characteristic data; adopting a genetic algorithm in combination with a frequency loss model to take Litz wire structure parameters as optimization variables, obtaining a structure parameter set for initially minimizing total loss and iteratively matching, and obtaining the Litz wire structure parameters; simulating the current flow path between winding layers through electromagnetic field simulation, and constructing a frequency-dependent current distribution model; extracting the loss density of each layer, identifying the loss concentration area, fine-tuning the equivalent capacitive reactance parameters to redistribute the current until the interlayer loss is balanced, and obtaining a final balanced distribution scheme; and finally, verifying the energy transmission under multiple working conditions, calculating the overall efficiency and temperature rise, and outputting the Litz wire structure parameters and winding layout that pass the verification. The application improves the energy transmission efficiency of the solid-state transformer under non-sinusoidal wave excitation.

A set of multi-winding transformer designs that achieve leakage integration in multi-port power electronics systems is presented. The magnetic design structures are extendable to realize an N-port multi-winding transformer with or without leakage inductance integration, that interfaces different voltage levels (high-voltage and / or low-voltage) with galvanic isolation. The disclosed designs enable: (i) reduced number of discrete magnetic components (ii) high efficiency and high power density; (iii) reduced transformer parasitic capacitances. Furthermore, a global transformer optimization approach that considers magnetizing and leakage inductances, core and winding losses, and parasitic capacitances is presented to systemize the sophisticated multi-winding integrated leakage transformer design process.

The present application relates to circular litz wire high frequency loss calculation technology, it is especially disclosed a kind of circular litz wire high frequency loss three-dimensional fast calculation method, the method includes the following steps: step one, understand the relationship between skin effect loss, internal proximity effect loss and external proximity effect loss;Step two, based on one-dimensional electromagnetic field theory and using Tourkhani model to obtain the loss expression of any circular litz wire unit length conductor in high-frequency magnetic element window;Step three, using finite element method to establish the two-dimensional finite element equivalent model of magnetic core window, extract external magnetic field and calculate external magnetic field;Step four, construct three-dimensional loss model considering the influence of litz wire's torsion inclination angle on external magnetic field.The beneficial effects of the present application are to realize the accurate and efficient calculation of circular litz wire winding loss in a wide frequency range.