15 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 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 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 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.

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.

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.