26 results about "Stray loss" patented technology

The utility model discloses a motor stator and a motor, and relates to the technical field of motors, the motor stator comprises a stator tooth module, a stator yoke module and a plurality of winding coils, the stator tooth module comprises a plurality of stator tooth modules which are sequentially connected along the circumferential direction of the motor stator, each stator tooth module comprises at least one stator tooth, and the winding coils are wound around the stator tooth module. Any two adjacent stator teeth are arranged at intervals along the circumferential direction of the motor stator to form stator slots; the stator yoke module comprises a plurality of stator yoke modules which are sequentially connected along the circumferential direction of the motor stator, and the plurality of stator yoke modules jointly surround the periphery of the stator tooth module and seal the openings of all stator slots; the winding coils are correspondingly accommodated in the stator grooves; wherein the stator tooth module and the stator yoke module are spliced into a whole. The utility model aims to effectively avoid the problems of serious air-gap magnetic field distortion, large cogging torque and torque pulsation, large stray loss, high temperature rise and high noise of the open slot of the high-voltage motor caused by cogging effect.

Disclosed in the present invention is a high-capacity on-load tap‑changing transformer, comprising a main tank, wherein a capsule-type conservator is mounted on the upper part of one end of the main tank, an on-load tap changer is mounted at the other end of the main tank, and radiators are mounted externally on two opposite sides of the main tank. An active part inside the main tank consists of windings and a core; the windings include a low-voltage winding, a high-voltage winding, a coarse regulating winding, and a fine regulating winding that are sequentially arranged from inside to outside; the high-voltage winding, the coarse regulating winding, and the fine regulating winding are connected to the on-load tap changer by means of leads. By using coarse and fine regulating structures, the coarse regulating winding and the fine regulating winding can be fully bypassed when the transformer operates at the most negative tap position, thereby effectively reducing stray losses caused by leakage flux, and also lowering resistive losses arising from the resistance of the regulating windings, and thus significantly improving the operational economy and reliability of the transformer.

The application provides a bendable end magnetic shielding structure capable of avoiding coil outgoing lines and a method thereof. The bendable end magnetic shielding structure capable of avoiding coil outgoing lines comprises a three-phase coil, the three-phase coil comprises a core and a coil wound outside the core, the upper and lower portions of the core are fixed with fixing frames, the upper and lower portions of the fixing frames located at the high-voltage side and the low-voltage side of the three-phase coil are fixed with magnetic shielding assemblies, the magnetic shielding assemblies comprise a plurality of shielding strips made of silicon steel sheets, and the outermost shielding strips in each magnetic shielding assembly are welded with grounding copper strips. The shielding strips constituting the magnetic shielding assemblies are made of silicon steel sheets and parallel to magnetic lines, can maximize the absorption of leakage magnetic, reduce the leakage magnetic into the metal components of the core clamp and the oil tank wall, reduce the stray loss, limit the eddy current generated by the leakage magnetic in the silicon steel sheets within the thickness of the silicon steel sheets, and maximize the reduction of the stray loss of the magnetic shielding itself.

The invention discloses an energy storage control method for reducing transformer loss by power grid side energy storage based on LSTM (Long Short Term Memory), and relates to the technical field of automatic control of a power system. A long short-term memory network containing a hysteresis memory embedding and correction layer is adopted to predict transformer loss decomposition, and hysteresis memory embedding is represented by a discretized magnetization state vector and is updated through a zero event and a peak event along with magnetism. And the marginal sensitivity and priority of the amplitude and phase of each harmonic current are scored. A real gradient is obtained by injecting auditable perturbation, and small-step calibration is carried out on model parameters. And establishing an optimization problem taking the loss decomposition weighted sum as a target, defining constraint redundancy by adopting a control barrier mechanism, and implementing constraint cutting. And selecting harmonic frequency points according to priority scores to implement injection. According to the method, comprehensive optimization of iron loss, copper loss and stray loss is realized, and the loss of the transformer is remarkably reduced on the premise of ensuring electric energy quality and thermal safety.

The utility model discloses a high-capacity on-load tap-changing transformer which comprises a body oil tank, a capsule type oil conservator is installed on the upper portion of one end of the body oil tank, an on-load tap-changing switch is installed at the other end of the body oil tank, and radiators are installed outside the two opposite sides of the body oil tank. A transformer body in the body oil tank is composed of windings and an iron core, the windings comprise a low-voltage winding, a high-voltage winding, a coarse voltage regulation winding and a fine voltage regulation winding which are sequentially arranged from inside to outside, and the high-voltage winding, the coarse voltage regulation winding and the fine voltage regulation winding are connected with the on-load tap-changer through leads. By adopting a coarse and fine voltage regulation structure, the coarse voltage regulation winding and the fine voltage regulation winding can be completely thrown away when the transformer operates at the most negative tap, so that stray loss caused by magnetic leakage can be effectively reduced, resistance loss caused by self resistance of the voltage regulation windings is reduced, and economical efficiency and reliability of operation of the transformer are greatly improved.

The invention discloses a transformer body structure and a transformer, which can effectively reduce eddy current loss, stray loss and circulating current loss generated in an iron clamp on the basis of ensuring the strength of the transformer body structure. The transformer body structure comprises a clamping piece, the clamping piece comprises two upper clamping pieces arranged side by side, and the two upper clamping pieces are arranged on the two sides of an upper iron yoke of an iron core respectively; and the upper clamping piece is made of an insulating material. The transformer body structure further comprises a fixing frame assembly, the fixing frame assembly comprises an upper fixing frame, and the upper fixing frame is located between the two upper clamping pieces. The two ends of the two upper clamping pieces are fixed to the upper fixing frame, and the upper fixing frame is used for supporting the two ends of the two upper clamping pieces in the transverse direction.

The application discloses an energy storage control method for reducing transformer loss based on an LSTM power grid side energy storage, and relates to the technical field of power system automatic control, wherein three-phase voltage and current waveforms and related state information are acquired through data acquisition and feature construction, a long short-term memory network containing a hysteresis memory embedding and a correction layer is used to predict transformer loss decomposition, the hysteresis memory embedding is characterized by a discretized magnetization state vector and is updated with a magnetic zero event and a peak event. The marginal sensitivity and priority score of the amplitude and phase of each harmonic current are obtained. A real gradient is obtained by injecting an auditable perturbation, and small-step calibration is performed on the model parameters. An optimization problem with loss decomposition weighted sum as the target is established, a control barrier mechanism is used to define the constraint margin and implement constraint clipping. The harmonic frequency points are selected according to the priority score for injection. The method realizes the comprehensive optimization of iron loss, copper loss and stray loss, and significantly reduces the transformer loss under the premise of ensuring power quality and thermal safety.

The invention provides a method and a system for diagnosing turn-to-turn and strand-to-strand short circuit defects of a transformer winding, and relates to the technical field of transformer fault defect detection. The method comprises the following steps: carrying out a transformer direct-current resistance test and a short-circuit loss test under different frequencies to obtain multiple groups of test data; calculating the stray loss of the structural member and the eddy current loss of the winding and the structural member under the fundamental wave frequency based on the test data; determining a loss distribution range and a threshold value through transverse and longitudinal statistics; and comparing test data with a threshold value, and judging whether the winding has turn-to-turn and strand-to-strand short circuit defects or not. The method solves the problems that a traditional detection method is low in sensitivity and limited in application range, and the sensitivity and accuracy of transformer winding short circuit defect diagnosis can be improved.

This invention provides a method for determining stray losses in transformers, belonging to the field of transformer technology. The invention establishes a multi-scale field quantity prediction model based on a time-folding network structure, constructs data constraint terms using measured data from Hall sensors, employs an adaptive residual point sampling strategy to densify point allocation in high residual regions and calculate physical constraint terms, introduces an adaptive weight balancing algorithm to dynamically adjust the weight coefficients of the composite loss function for model training, and applies the trained model to rapidly predict magnetic field strength components and eddy current loss density distributions under new design parameters. The total stray loss is calculated by volume integration of the eddy current loss density, and an analytical relation is extracted using a sparse identification algorithm. This solves the technical problems of low accuracy and insufficient computational efficiency in predicting stray losses in transformers.

The invention belongs to the technical field of manufacturing of high-voltage-class large transformers, and discloses a transformer magnetoelectric composite shielding protection clamp and a transformer. The transformer magnetoelectric composite shielding protection clamp comprises a clamp web, a plurality of horizontal limb plates are arranged at the bottom of the clamp web, a magnetic shielding assembly is arranged below the horizontal limb plates, and the magnetic shielding assembly comprises a plurality of silicon steel sheets stacked mutually; the two ends of the magnetic shielding assembly are arranged on the two sides of the clamp web respectively, the horizontal limb plate and the side end face of the magnetic shielding assembly are wrapped by a bent shielding plate in a surrounding mode, and the outer sides of the horizontal limb plate, the bent shielding plate and the bent shielding plate are wrapped by an electric shielding sheath. And an insulating protective sleeve is sleeved outside the electric shielding sheath. According to the invention, the problems of insufficient magnetic flux leakage and eddy current inhibition by single shielding, non-uniform static design heat dissipation, high field intensity insulation failure and complex process are solved, the stray loss of the clamp is better reduced, the problem of overlarge local temperature rise is solved, and the bent shielding plate is adopted to cover the sharp corner of the magnetic shielding plate, so that the temperature rise of the clamp limb plate is reduced.

The present application relates to the field of motor testing technology, and provides a motor loss separation test method, device, system and readable storage medium. The method includes: determining the no-load iron loss of the motor at the corresponding speed measurement point based on the mechanical torque and drag torque at each speed measurement point of the motor; determining the load iron loss of the motor based on simulation analysis and actual load testing; determining the motor body loss based on the motor operating parameters at the speed measurement point; determining the stray loss of the motor based on the AC side electric power; and outputting the no-load iron loss, load iron loss, motor body loss, stray loss and assembly iron loss respectively. The present application realizes the separation test of motor loss, and the motor losses obtained from these separation tests can provide a reliable basis for motor design and optimization, thereby helping to improve motor performance.

The invention discloses a real-time measurement system for the use process of a high-energy-efficiency distribution transformer. The real-time measurement system comprises a data acquisition module, a loss calculation module, an energy efficiency evaluation module and an optimization scheduling decision module, the invention relates to the technical field of power monitoring. According to the real-time measurement system for the use process of the high-energy-efficiency distribution transformer, an electromagnetic-mechanical-thermal multi-physics field coupling monitoring system is formed, abnormal vibration caused by looseness of an iron core is monitored and captured through vibration acceleration, insulation degradation caused by partial discharge is monitored through a discharge pulse signal of the distribution transformer, the loss calculation precision is improved, and the real-time measurement of the use process of the high-energy-efficiency distribution transformer is realized. An iron loss-copper loss-stray loss three-level decomposition framework is adopted, the loss estimation precision is further improved, an instantaneous energy efficiency and accumulated energy efficiency two-dimensional evaluation framework is constructed, data support is provided for dynamic scheduling of the distribution transformer, long-term energy consumption analysis can be achieved without power failure, and the real-time performance of detection is guaranteed.

The invention relates to the technical field of induction motor control, and discloses an induction motor on-line control method and system based on temperature and switching frequency time varying, and the method comprises the following steps: 1, building a loss model of a vehicle induction motor, including copper loss, iron loss and stray loss; step 2, constructing a loss objective function according to the loss model; 3, injecting a low-frequency fluctuation signal into the current angle, and obtaining a phase relation between loss change and current angle fluctuation according to loss response; determining the adjusting direction of the current angle according to the phase relation, and finding the optimal current angle; and 4, acquiring a direct current component related to the phase relation according to the adjustment direction, and adjusting the working point of the motor based on the direct current component to obtain an optimal working point with the minimum total loss. According to the method, the induction motor loss model fusing the double key factors of the temperature and the switching frequency is established, so that the loss characteristics of the motor in different operation states can be accurately reflected, and the optimal efficiency is realized on the premise of ensuring that the load requirement is met.

The invention discloses an electromagnetic field-based extra-high voltage reactor loss obtaining method and system, and the method comprises the steps: presetting the rated operation condition of an extra-high voltage reactor to obtain the total loss of the reactor, solving the electromagnetic field problem of the extra-high voltage reactor based on a finite element method, and obtaining the stray loss of a reactor housing and an internal structural member. And obtaining the transverse eddy-current loss and the longitudinal eddy-current loss of the winding, and adding the transverse eddy-current loss and the longitudinal eddy-current loss to obtain the winding loss. And obtaining the total iron core loss of the extra-high voltage reactor based on the obtained total loss, stray loss and winding loss of the reactor. According to the method, the loss value of each part of the reactor under the rated voltage and rated current load can be accurately calculated, so that the iron core loss of the extra-high voltage reactor is accurately obtained, and the calculation precision is remarkably improved.

The utility model discloses a transformer with a fixing assembly, which comprises clamping pieces, a transformer body and the fixing assembly used for fixing the plurality of clamping pieces and the transformer body, the fixing assembly comprises a positioning plate and a cushion block, and the positioning plate and the cushion block are fixed through a wood pin. The positioning plate is welded with the clamping piece, and the cushion block is arranged on the device body. According to the transformer with the fixing assembly, the structure of the fixing assembly is simple, and the number of metal components is small. The novel wood cushion block fully utilizes stress analysis and adopts a slope structure, so that under the condition that the structural strength is met, the operation is simple, materials are saved, the electric field distribution of the transformer is improved, and the stray loss of a metal component is reduced.

The invention relates to the field of transformer equipment structures, in particular to a transformer clamp composite support plate, an assembly structure and application, the composite support plate is formed by compositing a non-magnetic steel plate and a red copper plate, a non-magnetic steel and copper composite structure is adopted, stray loss can be remarkably reduced through complementation of electromagnetic performance of materials, and the reliability of the transformer clamp is improved. The overheating risk in the operation of the transformer is reduced, and a guarantee is provided for stable operation of the transformer. While the mechanical strength is guaranteed, the electromagnetic performance of the transformer is cooperatively optimized, and the method is an important technical means for high performance of the transformer.

The invention discloses a modular stator, a preparation method thereof and an axial magnetic field permanent magnet motor. The axial magnetic field permanent magnet motor comprises a modular stator, and rotors are arranged on the two axial sides of the modular stator respectively. The modularized stator comprises a plurality of skewed slot stator units which are spliced in the circumferential direction, each skewed slot stator unit comprises a skewed slot stator iron core and an armature winding coil wound on the skewed slot stator iron core, and each skewed slot stator iron core is provided with a right-angle wall and an oblique-angle wall which are opposite in the circumferential direction. The oblique angle wall gradually deviates from the central axis of the skewed slot stator core in the direction from the radial inner side to the radial outer side. By optimizing the appearance of the skewed slot stator iron core, the processing technology of the modular stator is simplified, stray loss is reduced, and the cogging torque and torque pulsation of the motor are reduced at the same time.

The invention provides a transformer DC resistance real-time monitoring method and system, and the method comprises the steps: collecting voltage and current signals at the primary side and secondary side of a transformer in real time, and calculating the current effective value and active power value of each period of the primary side and secondary side of the transformer, and the power difference value of the two sides; and according to the power difference value and the current effective value of the primary side and the secondary side of the transformer and in combination with the no-load loss of the transformer, the stray loss of the transformer and the historical operation condition, performing estimation calculation on the direct-current resistance of the transformer to obtain a real-time direct-current resistance estimation value of the transformer. By adopting the real-time monitoring method for the direct-current resistance of the transformer, the direct-current resistance of the transformer can be monitored on line in real time in the running state of the transformer.

The application relates to a three-dimensional wound core body single-path fixing structure and a three-dimensional wound core transformer, which comprises a support structure of a three-dimensional wound core body, the support structure comprising upper and lower clamping pieces and a plurality of connecting pieces connecting the clamping pieces; one of the connecting pieces is connected with the clamping pieces to form a conductive path, and the rest of the connecting pieces are connected with the clamping pieces by using an insulating structure, so that the connecting pieces connected in a direct connection mode form a single-path conductive path between the clamping pieces. One of the connecting pieces is connected with the upper clamping piece or the lower clamping piece without using any insulating structure, and the rest of the connecting pieces are connected with the upper clamping piece or the lower clamping piece by using an insulating structure, so that the clamping pieces have a single-path conductive path, and a closed loop circuit between the clamping pieces is avoided, the closed loop circuit is affected by leakage magnetic flux of a transformer coil and a core to generate induced current and produce stray loss.

The utility model belongs to the technical field of transformer assemblies, and particularly discloses a large transformer iron core binding structure which comprises a binding belt body which is made of Anecd semiconductor materials and bound on a transformer body. The transformer main body comprises an iron core frame, iron core columns and iron core yoke pieces, the iron core columns and the iron core yoke pieces are arranged on the iron core frame, the ribbon main body is bound on the iron core columns and the iron core yoke pieces, and a grounding wire is arranged on the ribbon main body; the ribbon main body is integrally formed, so that integral binding is realized, and the production efficiency can be improved; a grounding wire is welded on the cable tie main body, and the grounding wire is connected with the iron core frame to form equipotential so as to solve the problem of iron core outline sharp corner discharge; the Anecd semiconductor band material is used for binding the core column and the iron core yoke piece, so that the electric field distribution can be improved, the stray loss is reduced, the heat conduction is enhanced, the temperature is uniform, the mechanical stability is improved, and the maintenance and detection effects are simplified.

The present disclosure provides a rotor structure, a motor, and a compressor. The rotor structure includes: a rotor core and a cage structure. The rotor core includes an axially arranged first core segment and a second core segment, the first core segment being provided with rotor skew slots, and the second core segment being provided with rotor straight slots. The cage structure includes an axially arranged first cage and a second cage, the first cage being provided within the rotor skew slots of the first core segment, and the second cage being provided within the rotor straight slots of the second core segment. The rotor structure disclosed herein has a two-end rotor core with straight and skew slots, which reduces harmonic loss and stray loss in cast aluminum during motor operation, while also weakening synchronous additional torque. The structure is simple, compact, and effective. Without changing the structural material, while ensuring that the motor's magnetic properties meet the requirements, the rotor core cage is changed in shape, transforming a single skewed cage into two axially parallel cages, thereby reducing the noise level of the asynchronous motor and improving the motor's efficiency.

This utility model relates to a novel high-performance DC geared motor, comprising a shaft and a frame. A rotor core is mounted on the shaft, and the frame is inserted into the rotor core. A closed-slot ring is mounted on the outer circumference of the wound rotor core, with its inner diameter pressed into and fixed to the rotor core. The closed-slot ring is annular in structure. Sealing adhesive layers are provided on both sides of the frame and on the wound armature. By modifying the structure of the brushed motor rotor, a closed-slot design is implemented in the traditional rotor to reduce cogging torque, improve the smoothness of the solar energy mechanism's operation, reduce stray losses, and thus improve motor efficiency. The main body of the rotor core is sealed with a high thermal conductivity adhesive, with large-area sealing to improve the heat dissipation of the entire winding, reduce temperature rise and copper losses, thereby improving motor efficiency.

The present invention relates to a rotor and a motor. The rotor has an embedded rotor structure and includes: a rotor core, multiple extensions, and multiple magnetic components. The multiple extensions are distributed circumferentially on the rotor core, and each of the multiple magnetic components is arranged between two adjacent extensions. The multiple magnetic components are arranged alternately with north and south poles along the circumference of the rotor core. By setting a relationship between the length of the extension and the thickness of the magnetic components, the problems of large torque pulsation, large motor vibration, and large noise in existing motors are solved. At the same time, the problems of large motor cogging torque, poor operating stability, and large speed fluctuations during low-speed operation are solved. While solving the large motor torque pulsation and large cogging torque, the motor stray losses can be reduced, which is conducive to improving the motor efficiency.

This utility model discloses a transformer core structure and a transformer, which can effectively reduce eddy current losses, stray losses, and circulating current losses generated in the iron clamps while ensuring the structural strength of the transformer core. The transformer core structure includes clamps, specifically two upper clamps arranged side-by-side, respectively positioned on both sides of the yoke on the iron core; the upper clamps are made of insulating material. The transformer core structure also includes a fixing frame assembly, comprising an upper fixing frame located between the two upper clamps. Both ends of the two upper clamps are fixed to the upper fixing frame, which provides lateral support to both ends of the two upper clamps.

The transformer conducting rod mounting structure comprises an oil tank, a conducting rod and a sealing piece, the conducting rod comprises a conducting rod body and a connecting part, the connecting part is connected with the conducting rod body, the connecting part is used for being connected with the oil tank, the oil tank comprises an insulating tank wall, and the insulating tank wall is connected with the connecting part and detachably connected with the oil tank; the sealing piece is arranged between the conducting rod and the oil tank. According to the transformer conducting rod mounting structure, the arrangement of the connecting part and the insulating box wall facilitates the connection of the conducting rod and the oil tank, a hand hole does not need to be formed in the oil tank, the mounting convenience of the conducting rod is improved, and the assembling process can be simplified; as the hand hole is omitted, the material cost of the transformer can be reduced, the condition of poor sealing performance caused by the hand hole is improved, and the risk of oil leakage of the oil tank is reduced; the oil tank adopts the insulating tank wall to replace the previous non-magnetic steel tank wall, and the insulating tank wall does not generate stray loss and does not generate heat, so that the volume of the oil tank can be reduced.

The application relates to the field of outer rotor motors, and particularly discloses a cooling system of an outer rotor motor, which comprises a bearing seat, a stator end cover and a stator assembly. A sealing ring is sleeved on the outer wall of the bearing seat, the stator assembly is installed on the outer side of the sealing ring, the stator end cover is fixed to the end of the bearing seat, the outer wall of the bearing seat is formed with a cooling water channel, and the stator end cover is respectively formed with a water inlet hole and a water outlet hole which are communicated with the cooling water channel. The application can effectively reduce the temperature rise of a high-power outer rotor motor and the heat dissipation of the stator in the outer rotor motor, accelerate the flow and dissipate heat in multiple directions, make the temperature of the stator assembly consistent and reduce the temperature of the stator assembly, reduce the copper loss and the stator stray loss during operation, improve the motor efficiency, eliminate the material structure failure caused by the excessively high temperature, reduce the material structure failure, and enable the outer rotor motor to operate efficiently and reliably.