49 results about "Stray loss" patented technology

The invention relates to the technical field of motor testing, and provides a motor loss separation testing method, device and system and a readable storage medium. The method comprises the following steps: determining no-load iron loss of the motor at a corresponding rotating speed measuring point according to a mechanical torque and a dragging torque of the motor at each rotating speed measuring point; determining the load iron loss of the motor according to the simulation analysis and the actual load test; determining the loss of a motor body according to the motor operation parameters of the motor at the rotating speed measurement point; determining stray loss of the motor according to the alternating current side electric power; and no-load iron loss, load iron loss, motor body loss, stray loss and assembly iron loss are respectively output. Separation testing of the motor loss is achieved, the motor loss obtained through the separation testing can provide a reliable basis for design and optimization of the motor, and therefore the performance of the motor can be improved.

The invention 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 rapid and accurate stray loss analysis method for an induction motor. A sine wave excitation space harmonic module, an inversion feed excitation space harmonic module and a stray loss module form a stray loss and space harmonic relation system; the stray loss system under the influence of the output power is composed of a surface eddy current loss system composed of a magnetization inductance module, a harmonic amplitude module and a surface eddy current loss module and a magnetic flux pulsation loss system composed of a harmonic amplitude module, a stator harmonic stray loss module, a rotor harmonic stray loss module and a magnetic flux pulsation loss module. The stray loss system under the influence of the output power, the stray loss system under the influence of the power supply frequency and the stray loss system under the influence of the total harmonic distortion of the current form a stray loss system under the influence of multiple factors; the loss analysis provided by the invention can distinguish stray loss values of motors with the same rated power but different efficiency levels.

The wire outlet structure comprises an oil tank, a first mounting plate, a first sealing piece and a connecting piece, the tank wall of the oil tank is made of an insulating material, a first mounting hole and a first connecting hole are formed in the tank wall of the oil tank, and the first mounting hole is a through hole; the first mounting plate is attached to the inner wall or the outer wall of the oil tank and is provided with a second mounting hole and a second connecting hole, and the second mounting hole is a through hole; the first sealing piece is pressed between the first mounting plate and the tank wall of the oil tank; the conducting bar penetrates through the first mounting hole and the second mounting hole, and two ends of the conducting bar are respectively arranged inside and outside the oil tank; the connecting piece is matched with the first connecting hole and the second connecting hole so as to press the first sealing piece; the oil tank of the wire outlet structure is made of insulating materials, stray loss cannot be generated, heating cannot be generated, and therefore the size of the oil tank can be effectively reduced; and meanwhile, sealing connection between the first mounting plate and the oil tank is achieved through the arrangement of the first sealing piece and the connecting piece.

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.

The invention discloses a motor rotor loss detection device, and relates to the technical field of compressor detection, in particular to a compressor motor rotor loss detection device. According to the invention, the two stators are adopted for excitation in opposite directions, and the stray loss of the rotor is detected and judged according to the size of a power value detected by the detection coil; the base is of a circular groove structure; a shaft is vertically assembled in the center of the base through a bushing and a limiting spring; a sheath is assembled on the upper part of the circumferential table of the base; the top and the bottom of the sheath are each provided with a set of stator, and the stators are packaged through an upper cover plate, a lower cover plate and bolts. The stator is electrically connected with the detection circuit; and a tested rotor is sleeved on the shaft. According to the technical scheme, the problems that in the prior art, an open transformer detection method cannot judge groove breakage, tail end circular ring perforation, poor bevel angle, poor stray loss and the like, and a rotor induced potential oscilloscope test method cannot detect and judge stray loss are solved.

The utility model discloses a body structure of a high-capacity and ultrahigh-impedance three-phase double-ring oil-immersed power transformer, which comprises an iron core assembly, a clamp assembly and a winding assembly, the clamp assembly is arranged on the periphery of an iron yoke of the iron core assembly, and the winding assembly is sleeved on a main column of the iron core assembly; iron yokes are respectively arranged at the upper and lower ends of the main column; the clamping piece assembly comprises upper webs and lower webs, and the two upper webs are symmetrically arranged on the two sides of the upper iron yoke; the two lower webs are symmetrically arranged on the two sides of the lower iron yoke. The upper web plate and the lower web plate are each of a box-shaped structure, the lower surface of the upper web plate is arranged on the center line plane of the upper iron yoke, the upper surface of the lower web plate is arranged on the center line plane of the lower iron yoke, and the lower surface of the upper web plate and the upper surface of the lower web plate are each provided with a three-phase counteracting type magnetic shield; according to the utility model, the stray loss of the metal piece on the high-capacity and high-impedance transformer body and the temperature rise of the metal piece are obviously reduced by adopting the box-shaped clamping piece, the three-phase counteracting type magnetic shielding structure and the like.

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 invention provides a transformer thermal life evaluation method for a metal structural member. The transformer thermal life evaluation method comprises the following steps: firstly, establishing a digital twinborn model of an oil-immersed transformer; carrying out three-dimensional magnetic field calculation by taking a current source as excitation, and carrying out electromagnetic field calculation to obtain stray loss of a metal structural member in the transformer as a heat source to be coupled into a temperature field; respectively calculating convective heat transfer coefficients of the clamping piece and the pulling plate through the target Nusselt number and the hot spot position Nusselt number, and calculating heat conductivity coefficients of contact surfaces of the clamping piece and the pulling plate and the insulator through a heat conduction formula; a linear relation is obtained by simplifying the transformer heat distribution diagram, and therefore the corresponding oil temperature is calculated according to the height of the metal structural part; loading a calculation result into temperature field simulation analysis of the transformer; comparing and correcting the temperature obtained by the method with the temperature measured by the transformer optical fiber; and introducing an insulation thermal aging evaluation standard through the hot-spot temperature rise state of the metal structural member of the transformer to evaluate the thermal life of the transformer of the metal structural member.

The utility model discloses a structure for inhibiting overheating of an iron core piece of an on-site assembled transformer, which relates to the field of transformers and comprises a fixed supporting pull plate structure, an adjustable insulating pull plate structure and an upper clamping piece, the fixed supporting pull plate structure plays a role of integrally supporting a framework, an adjustable pull plate is arranged on one side of the upper clamping piece, and the adjustable insulating pull plate structure is arranged on the other side of the upper clamping piece. A hanger shaft is welded on the upper clamping piece; and an adjustable hanger shaft insulating piece is arranged on the hanger shaft. According to the utility model, the assembly requirement of field assembly of the transformer is met, the supporting strength of the iron core is ensured, the circulation in the iron core structural member is reduced, the heat dissipation of the iron core structural member is enhanced, the overheating risk is reduced, and the stray loss of the transformer is reduced, so that the total loss of the transformer is reduced, and the economic performance is better.

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 application discloses a kind of calculation method and device for temperature rise characteristic of flexible straight transformer under DC bias magnetic working condition. Among them, method includes: based on the structure parameters, material parameters and operating parameters of the obtained soft straight transformer to be analyzed, the DC component in multiple side windings is uniformly converted to reference side, and equivalent DC bias magnetic current is obtained;Magnetic bias index for characterizing the magnetic bias degree of each core partition is constructed;According to the magnetic bias index and the material parameters, the winding loss, core loss and structural member stray loss are calculated respectively;Winding loss, core loss and structural member stray loss are mapped as heat source, and heat capacity network is established;According to the magnetic bias index of the region adjacent to the oil duct and the temperature-related physical property parameters of the insulating oil, the convective heat transfer coefficient and convective thermal resistance of each oil duct unit are dynamically corrected;Electromagnetic-thermal coupling iterative solution is carried out, the winding corresponding thermal node temperature distribution is obtained, and the winding hot spot temperature, top layer oil temperature, core maximum temperature and structural member maximum temperature are output.

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 distribution transformer harmonic loss calculation method, relates to a power system harmonic loss calculation method, and aims to solve the problem of poor calculation result precision of an existing distribution transformer harmonic loss method. According to the method, the harmonic iron loss is obtained by calculating the hysteresis loss and the eddy current loss of the distribution transformer; the method comprises the following steps: calculating resistance loss of a distribution transformer winding, harmonic loss of the distribution transformer winding and stray loss of a distribution transformer; obtaining harmonic copper loss; and adding the harmonic iron loss and the harmonic copper loss to obtain the harmonic loss of the distribution transformer. The method has the beneficial effects that an eddy current harmonic loss factor and a stray harmonic loss factor of the distribution transformer are introduced, and the precision of a calculation result is improved.

The invention relates to a processing method for reducing rotor loss and stray loss, belongs to the technical field of motors, solves the technical problem that the rotor loss is still large due to the fact that a motor rotor adopts a turning mode, and comprises the steps of grinding the motor rotor and singeing the motor rotor. The method further comprises the following steps: S1, performing a B-method type test on the motor; s2, performing rotor grinding treatment and singeing treatment on the motor rotor, and then performing the type test in the step S1 again; s3, comparing the proportion relation between the stray loss and the total loss of the two-time type test of the motor to determine the validity of the stray loss data; and S4, comparing the change rules of the stray loss after the two types of tests, thereby judging the reason causing the large loss of the rotor. According to the rotor processing method, the electromagnetic loss of the surface of the motor rotor can be reduced, the stray loss of the whole motor is further reduced, and the efficiency of the motor is 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 utility model relates to the technical field of transformers, in particular to a novel transformer oil tank shielding structure. According to the technical scheme, the oil tank comprises an oil tank body, fixing blocks, sliding blocks and screws, a sliding rail is installed on one side of the lower end of the inner wall of the oil tank body, the sliding blocks distributed in parallel at equal intervals are slidably installed on the outer wall of the upper end of the sliding rail, the fixing blocks are installed on the outer walls of the two sides of each sliding block, and supporting plates are arranged on the outer walls of the upper ends of the fixing blocks; a magnetic shielding device is arranged on the outer wall of the upper end of the supporting plate, screws are installed on the two sides of the outer wall of the lower end of the supporting plate, and by arranging the sliding blocks, the magnetic shielding device and the screws, the effect of improving leakage flux distribution is achieved, leakage flux is attracted to enter the transverse magnetic shielding device, stray losses are reduced, and the overheating phenomenon of structural parts is effectively reduced.

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 present invention discloses an automatic wire embedding method for single-and double-layer windings based on lamination having large-and small-slots which belongs to the technical field of motor manufacturing. The method comprises: performing six times embedding to complete the wire embedding of the windings, and embedding of respective one pole-phase group coil for two phases among three phases in each time embedding, wherein the windings are single-and double-layer windings, and each pole-phase group coil consists of five coils in which a coil with a largest span is a single-layer coil and is pulled into small stator slots and the other four coils are double-layer coils and are pulled into large stator slots. The method ensures the symmetrical distribution of each phase conductor in the core slot and the end space, reduces the unevenness of no-load current and short-circuit current of the whole machine, reduces stray loss, shortens the winding half turn length, reduces the copper weight of the stator and reduces the material cost of the motor.

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.