59 results about "Winding loss" patented technology

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 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 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 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 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 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 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.

The invention discloses a resonant converter based on a multilayer insulated wire and magnetic core integrated structure and an energy transmission method. The resonance unit comprises at least one resonance capacitor and at least one resonance inductor; the switch unit is used for converting direct current input into a high-frequency alternating current signal and applying the high-frequency alternating current signal to the resonance unit; the resonant converter further comprises an energy transmission unit, the energy transmission unit comprises a magnetic core, a primary winding and a secondary winding, and the primary winding adopts three layers of insulated wires and is wound on the magnetic core according to a preset electromagnetic field distribution model; wherein the winding structure of the primary winding and the physical structure of the magnetic core are cooperatively configured, so that the leakage inductance of the energy transmission unit is precisely limited as a first target value, and the winding structure is optimized to reduce the alternating current winding loss under the working frequency; the technical problem that the overall efficiency and consistency are difficult to consider due to the fact that a transformer in an existing resonant converter is large in leakage inductance discreteness and high in high-frequency loss can be solved.

The invention discloses a motor and a compressor. The motor comprises a stator core and a rotor core. The stator core comprises a stator yoke part and a plurality of stator tooth parts, and a stator slot is formed between every two adjacent stator tooth parts; the rotor core is provided with a plurality of permanent magnet grooves, each permanent magnet groove comprises a first groove body and a second groove body, and the first groove body and the second groove body are arranged in a V shape; wherein the outer diameter of the stator core is R1, the inner diameter of the stator core is R2, the width of the stator tooth part is L1, the thickness of the stator yoke part is L2, the number of the stator slots is Q, and the included angle between the connecting line of the outermost side vertex of the slot edge of the first slot body and the center of the rotor core and the connecting line of the outermost side vertex of the slot edge of the second slot body and the center of the rotor core is theta, r1, R2, L1, L2, Q and theta meet the relational expression that theta * pi / 180 * L1 * Q / (R1 + R2) / L2 is larger than or equal to 0.12 and smaller than or equal to 0.147. The permanent magnet motor can solve the problems of high winding loss and low motor efficiency of the permanent magnet motor in the prior art.

This invention discloses an equivalent temperature rise testing device and method for high-frequency transformers. The device includes a high-frequency AC power supply, a first DC power supply, and a second DC power supply, which are connected in parallel with the primary and secondary windings of the high-frequency transformer under test through a DC blocking capacitor and an isolation inductor, respectively, to simultaneously simulate core losses and winding losses. The testing method includes determining the target loss, adjusting the power supply output to make the actual loss equal to the target loss, and monitoring the temperature rise to a steady state. This method can accurately reproduce the steady-state temperature rise of the transformer under rated operating conditions, and has low testing costs and is easy to operate.

The application relates to a high-frequency transformer electromagnetic structure optimization technology, in particular to a high-frequency transformer electromagnetic structure optimization method based on an intelligent optimization algorithm, which comprises the following steps: step one, setting system parameters, selecting fixed parameters and decision variables, and obtaining the minimum voltage phase-shifting angle of zero-voltage switching based on the equivalent circuit of a BDA transformer; step two, performing parameterization processing on the magnetic core and winding structure in the high-frequency transformer and calculating the magnetic core loss and winding loss, constructing a leakage inductance calculation model, establishing a multiple insulation structure and calculating the insulation distance; step three, establishing a multi-objective optimization mathematical model of the high-frequency transformer; and step four, seeking an optimal solution on the basis of the multi-objective optimization mathematical model of the high-frequency transformer, and manufacturing a 60kVA, 400V / 400V, 10kHz high-frequency transformer prototype according to the optimal solution.The application has the beneficial effect that a 60kVA / 10kHz, 400V / 400V high-frequency transformer prototype can be optimized, the efficiency is 99.65%, and the power density is 71.7kW / m<3>. 3 ​

The invention relates to the technical field of inductance loss measurement, and discloses a sensor-based inductance winding loss measurement method and system. The method comprises the following steps: synchronously acquiring a real-time current signal, a voltage signal and a surface temperature distribution signal during operation of the hollow winding inductor through an array type electrical sensor; and calculating a skin depth threshold value under the current working condition based on the skin effect dynamic model in combination with the current signal frequency and the conductor material parameters, and performing multi-channel adaptive filtering on the current signal to extract a matched effective current component. A stray capacitance compensation coefficient matrix is generated by combining the spatial distribution parameters of the segmented winding structure, and the instantaneous power loss value of each segment is calculated according to the effective current component, the voltage signal and the compensation coefficient matrix; thermal coupling errors are corrected through the mapping relation between the temperature distribution signals and the power loss values, the corrected loss values of all the segments are finally integrated, the comprehensive loss index of the hollow winding inductor is output, and the method is suitable for the loss evaluation scene of the hollow winding inductor.

The invention relates to a method for evaluating electromagnetic parameters of a medium-high-voltage high-frequency transformer. The method comprises the following steps: inputting design parameters and electrical parameters of the high-frequency transformer; establishing a finite element model of the two two-dimensional sections, and performing finite element simulation according to the electrical parameters; primary and secondary side self-inductance parameters and primary and secondary side mutual inductance parameters are obtained based on finite element simulation, and excitation inductance and leakage inductance parameters are solved; sequentially calculating the average leakage magnetic field intensity of the position of each turn of winding based on the leakage magnetic field distribution of the transformer magnetic core window, and further solving the total winding loss of the high-frequency transformer; and obtaining the excitation voltage waveform of the high-frequency transformer based on the electrical parameters, establishing the relationship between the voltage and the magnetic flux density, and solving the iron core loss in combination with the iron core design parameters. According to the method, the electromagnetic parameter evaluation period of the medium-high-voltage high-frequency transformer is remarkably shortened, calculation resource consumption is reduced, powerful support is provided for rapid iterative optimization of a design scheme, and the method has good engineering practical value and popularization and application prospects.

The invention 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 non-isolated LLC resonant conversion circuit, which belongs to the field of electric energy conversion and comprises a primary side switch module, a resonant module and a secondary side switch module. The input voltage, the primary side switch module, the resonance module, the secondary side switch module and the output voltage are connected in sequence. According to the non-isolated LLC resonant conversion circuit, the secondary winding adopts a star-shaped connection structure, the circuit can achieve most of the advantages of a traditional isolated three-phase LLC, such as realization of a zero-voltage switch, and in addition, through a non-isolated technology, volt seconds and winding current are reduced, the size of a transformer is reduced, and magnetic core loss and winding loss are reduced. And the method can be realized in a transformer magnetic integration mode, the magnetic core material consumption is reduced, and the overall space utilization rate and the magnetic performance stability of the transformer are improved. The transformer does not need to additionally design an insulation structure and a winding interval meeting the isolation requirement, the design of the transformer is further simplified, the size is reduced, and meanwhile magnetic core loss and winding loss are reduced.

This invention discloses a method for calculating the global temperature field distribution of a transformer. The method includes: obtaining core and winding losses through finite element electromagnetic field simulation and establishing the relationship between winding losses and temperature; testing the relationship between transformer oil thermal properties and temperature; constructing and simulating an electromagnetic-thermal-fluid physical field coupling model to form a temperature distribution database under different load rates; constructing a calculation model with input three-phase current and top oil temperature, and after training with measured data and the database, quickly outputting the global temperature field distribution. This method balances computational efficiency and accuracy, providing strong support for transformer condition sensing.

The invention discloses a high-frequency loss characteristic characterization method of a non-closed magnetic core. The method comprises the following steps: constructing a test unit; the test unit comprises an inductor arranged around the non-closed magnetic core; under the condition of high-frequency large signals enabling the non-closed magnetic core to enter a nonlinear working state, a test unit is used for collecting and preprocessing voltage signals and current signals at the two ends of the non-closed magnetic core; performing Fourier transform on the preprocessed voltage signal and current signal to generate voltage frequency spectrum information and current frequency spectrum information; calibrating the parasitic parameters of the test unit and the time delay of the system; calculating inductor coil winding loss parameters; acquiring impedance parameters, inductance parameters and resistance parameters of the inductor at different frequency points according to the ratio of the voltage spectrum information to the current spectrum information; and performing fitting operation and analysis on the impedance parameter, the inductance parameter and the resistance parameter to generate a magnetic core loss characteristic curve under the high-frequency large-signal condition for enabling the non-closed magnetic core to enter a nonlinear working state.

An inverter control device (200) controls an inverter (100) that drives a motor (300) cooled by a refrigerant. A processor of an inverter control device (200) estimates a refrigerant flow rate (e.g., a refrigerant flow rate Q or a change amount [Delta] Q in the refrigerant flow rate) indicating the flow rate of a refrigerant (a cooling state estimation unit (270)). The processor estimates a motor temperature Temp (a motor temperature estimation unit 280) on the basis of the estimated value of the refrigerant flow rate and the loss of the motor (winding loss Pcoil, stator loss Psta, rotor and magnet loss Prot, etc. The processor corrects the current command of the motor (300) such that the estimated value of the motor temperature Temp is equal to or less than a threshold value (set temperature) (current command correction unit 290).

The invention belongs to the field of finite element simulation, and discloses a finite element simulation method and system for doubly-fed motor loss, and the method comprises the steps: building a 3D geometric model of a motor; performing motion setting and excitation setting on the 3D geometric model of the motor; performing mesh generation on the 3D geometric model of the motor after the motion setting and the excitation setting; simulating the 3D geometric model of the motor after mesh generation to obtain the loss distribution of the winding copper loss under the standard working condition; calculating the copper loss of other working conditions according to the loss distribution of the winding copper loss of the standard working condition; and calculating iron loss under other working conditions according to the loss distribution of the winding copper loss under the standard working condition. According to the method, motor winding loss and stator and rotor iron loss power consumption calculation can be coupled with thermal simulation analysis for simulation calculation. The actual current harmonic component is considered into excitation, and the influence caused by the actual current harmonic and the winding skin effect is fully considered.

The utility model discloses an LLC magnetic element winding integrated structure which comprises a resonant inductor middle column, a transformer middle column and a PCB winding, the resonant inductor middle column and the transformer middle column are transversely arranged in parallel, the PCB winding surrounds the resonant inductor middle column and the transformer middle column to be integrated together in a routing mode, and the PCB winding surrounds the resonant inductor middle column and the transformer middle column at the same time. A resonant inductor winding and a transformer primary winding can be integrated, so that winding loss and the size of a magnetic element are reduced, and the purpose of improving power density and efficiency is achieved. According to the magnetic integration mainly based on the PCB winding form, when a certain layer of PCB is provided with the resonant inductor and the transformer primary side winding at the same time, the winding modes of the resonant inductor and the transformer primary side winding are not independently carried out any more and are integrated together, so that the winding length is reduced, and the purposes of reducing winding loss and reducing the magnetic core size are achieved.

The invention discloses an inverter transformer loss dynamic adaptation method based on digital twinning, and relates to the technical field of power electronics. The method comprises the following steps: S1, constructing a multi-physical field digital twinborn model integrating magnetic core loss, winding loss, parasitic parameters and a thermal-magnetic coupling sub-model; s2, initial operation parameters are optimized and determined for topology such as LLC resonance and dual active bridges; s3, acquiring signals such as magnetic flux density in real time through a sensor, synchronizing to model update loss and parasitic parameters, and executing dynamic regulation and control when deviating from a preset range; and S4, recording full-life-cycle data, constructing a machine learning time sequence loss degradation prediction model, and dynamically adjusting parameters and strategies in combination with load fluctuation characteristics to realize full-working-condition adaptive optimization. The method solves the problems that a traditional method is low in prediction precision, rigid in adaptation, lagged in regulation and control and the like, transformer loss prediction accuracy and operation efficiency are improved, system reliability is enhanced, and the service life is prolonged.