102 results about "Winding loss" patented technology

The invention provides a temperature prediction method and device for a high-frequency transformer, and belongs to the field of transformers. The method comprises the following steps: acquiring a temperature field parameter of a target high-frequency transformer; calculating initial magnetic core loss and initial winding loss according to the temperature field parameters; inputting the initial magnetic core loss and the initial winding loss into a pre-constructed thermal network model to obtain the temperature of each node in the pre-constructed thermal network model; based on the initial temperature of each node, correcting the initial magnetic core loss and the initial winding loss, and inputting the corrected initial magnetic core loss and initial winding loss into a pre-constructed thermal network model to recalculate the temperature of each node; and when the temperature of each node satisfies a preset condition, obtaining a temperature prediction value of each electromagnetic component of the target high-frequency transformer. According to the method, the problem that the high-frequency transformer is inaccurate due to inaccurate modeling and excessive conditions in a traditional method can be solved, and the accurate and effective temperature prediction method for the high-frequency transformer is provided.

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 an early warning method and system for a turn-to-turn short circuit fault of a distribution transformer winding, and the method comprises the steps: obtaining the current, voltage, oil temperature, oil pressure and oil level of the distribution transformer winding, and calculating the maximum value of the dynamic power loss change rate, the maximum value of the voltage change rate and the maximum value of the main current change rate during the operation of the winding; when the oil pressure and the oil level are within a set range, and the maximum voltage change rate and the main current change rate are smaller than set threshold values respectively, corresponding signals are sent out according to the oil temperature and winding loss change conditions. The current, the voltage, the oil temperature, the oil level and the oil pressure obtained from the distribution transformer winding are utilized, the current change rate, the voltage change rate and the power loss change rate obtained through calculation are combined, multiple parameters are comprehensively considered, and the condition of the winding turn-to-turn short circuit fault is early warned. Compared with the prior art that only current change and power loss are considered, the method can more accurately perform early warning on the possible winding turn-to-turn short circuit fault.

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 discloses a CLLC resonance circuit circular litz wire winding loss calculation method and system, and the method comprises the steps: constructing a litz wire internal magnetic field intensity model, and determining a polar coordinate expression of the circular litz wire magnetic field intensity according to the litz wire internal magnetic field intensity model; determining a primary side current effective value and a secondary side current effective value of the CLLC resonance circuit; a proximity effect loss expression is determined, and according to the polar coordinate expression, the primary side current effective value, the secondary side current effective value and the proximity effect loss expression, a proximity effect loss value of the primary side and the secondary side of the CLLC resonance circuit is obtained through calculation; and determining a skin effect loss expression, and calculating the skin effect loss value of the primary side and the secondary side of the CLLC resonant circuit according to the polar coordinate expression, the primary side current effective value, the secondary side current effective value and the skin effect loss expression. The method improves the accuracy of loss calculation of the circular litz wire winding of the CLLC resonance circuit, and can be applied to the technical field of circuit measurement.

The invention provides a multi-physical field optimization design method and system for a high-capacity high-frequency transformer, and belongs to the technical field of high-frequency transformers, and the method comprises the steps: constructing optimization targets of the cost, power density and efficiency of the high-frequency transformer according to the application demands of the high-frequency transformer; based on the optimization targets of the cost, the power density and the efficiency of the high-frequency transformer, a calculation model of iron core loss and winding loss is introduced, and the loss amount of the high-frequency transformer is obtained; based on the maximum feasible size of the high-frequency transformer iron core and thermal and electromagnetic constraints, introducing iron core size constraints; and based on the constraint of the size of the iron core, carrying out optimization design on the high-frequency transformer by using a Taguchi method, and based on a selective non-dominated genetic algorithm, carrying out Pareto frontier relation analysis on the high-frequency transformer subjected to the optimization design to obtain an optimal design scheme of the high-frequency transformer. And comprehensive optimization requirements of multiple physical fields can be effectively met.

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 belongs to the technical field of transformers, and particularly relates to a high-frequency transformer mixed winding design and comprehensive evaluation method which mainly comprises the following steps: designing primary and secondary windings by considering three winding types of copper foil, flat copper wire and litz wire according to electrical indexes and design requirements of a high-frequency transformer, and giving a design scheme; establishing a fine calculation model for loss of different types of windings, and deducing loss expressions of primary and secondary windings in different design schemes; providing evaluation indexes reflecting winding efficiency, cost effectiveness and heat dissipation performance; establishing a comprehensive evaluation model based on an AHP-entropy weight combination method and a TOPSIS method which are combined subjectively and objectively; according to a comprehensive evaluation result, selecting an optimal high-frequency transformer winding design scheme; the method provides a new thought for the optimization design of the high-frequency transformer, can realize the balance between the winding performance and the cost of the transformer, and is beneficial to engineering application.

The invention discloses a preparation method of a magnetic integrated matrix transformer. The preparation method comprises the following steps: calculating a turns ratio of an input power supply and an output power supply of the magnetic integrated matrix transformer to be prepared; determining the number of turns of the secondary winding according to the output power supply; calculating the number of turns of a primary winding according to the turns ratio of the transformer and the number of turns of a secondary winding; calculating an available setting space of a magnetic core in the magnetic integrated matrix transformer according to the power supply framework and the output power supply; calculating the number of settable layers according to the available setting space and the thickness of the printed circuit board with the winding layer; the winding structure of the sub-transformer is designed according to the settable layer number, each printed circuit board with the winding layer is provided with one of a primary winding and a secondary winding, the width of the primary winding and the width of the secondary winding are the same, and the primary winding and the secondary winding of each sub-transformer are of a sandwich structure; through the preparation method, the design process is flexible and simplified, so that the purposes of minimizing the winding loss and improving the preparation efficiency are achieved.

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 invention discloses a double-half-bridge direct-current converter integrated structure. Comprising an input direct-current power supply Vin, a first switch tube S1, a second switch tube S2, a third switch tube S3, a fourth switch tube S4, a first resonance unit circuit, a second resonance unit circuit, a transformer T, a first synchronous rectifier tube SR1, a second synchronous rectifier tube SR2, a third synchronous rectifier tube SR3, a fourth synchronous rectifier tube SR4, a first output filter capacitor Co1 and a second output filter capacitor Co2, the transformer T comprises a first primary winding PT1, a second primary winding PT2, a first secondary winding ST1, a second secondary winding ST2, a third secondary winding ST3 and a fourth secondary winding ST4. Full-period work of the transformer winding is achieved, the winding utilization rate is high, the shortest alternating current path, high efficiency and high power density of the winding are achieved, winding loss and the occupied area are effectively reduced, control is easy, reliability is high, and implementation is easy.

The invention discloses an interlaced anti-laser photovoltaic inverter and a design method, and relates to the technical field of inverter design. In the first aspect, by tracking the maximum power point of the power supply, it is ensured that the power supply works in the optimal working state, the situation that the working performance of the interlaced anti-laser photovoltaic inverter is low due to the fact that the interlaced anti-laser photovoltaic inverter is affected by temperature and illumination intensity is avoided, and voltage and current are converted again through the inversion module; the solar energy conversion performance and the power grid output efficiency of the interlaced anti-laser photovoltaic inverter are improved, and the working performance of the interlaced anti-laser photovoltaic inverter is improved. And on the other hand, the optimal interlaced anti-laser photovoltaic inverter is determined through the optimal winding mode and the optimal air gap division number in combination with a preset air gap avoidance method. By designing the winding method of the flyback transformer, dividing the air gap and avoiding the air gap, the winding loss of the flyback transformer is reduced, and the working performance of the staggered anti-laser photovoltaic inverter is improved.

The invention relates to the technical field of motors, and discloses a permanent magnet auxiliary ring winding electro-magnetic salient pole synchronous motor, which comprises a stator core, a rotor core sleeved with the stator core, a ring excitation winding wound on the rotor core and a plurality of permanent magnets arranged on the rotor core, the rotor iron core is of an annular structure, the outer surface and the inner surface of the rotor iron core are respectively provided with a plurality of outer grooves and inner grooves in one-to-one correspondence in the circumferential direction, a rotor yoke part is formed between the outer grooves and the inner grooves, and the annular excitation winding is wound on the rotor yoke part through the outer grooves and the inner grooves; according to the invention, the number of ampere turns of the annular excitation winding can be reduced, so that the loss of the annular excitation winding is reduced, the problem that the temperature rise of the rotor is too high is solved, the efficiency and the power density of the motor are improved, the structural complexity of the rotor is reduced, and the reliability is improved.

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 relates to the technical field of winding loss measurement, and discloses an inductor winding loss measurement method and system, and the method comprises the steps: carrying out the partitioning processing of an inductor winding, obtaining a partitioned winding, and setting an initial filling factor of the partitioned winding; after excitation current is input into the inductance winding, factor related parameters of the partition winding are measured through a factor detection tool, and winding related parameters of the partition winding are measured through a winding detection tool; based on the factor related parameters, analyzing a single deformation area of a single wire in the inductance winding, performing wire accumulation processing on the single deformation area, and converting an initial filling factor into a dynamic filling factor through a single area deformation area; and analyzing the initial eddy-current loss of the partitioned winding, performing loss dynamic adjustment on the initial eddy-current loss by using the dynamic fill factor to obtain dynamic eddy-current loss, and determining the final eddy-current loss of the inductance winding through the dynamic eddy-current loss. According to the invention, both measurement accuracy and measurement convenience can be considered.

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.