26results about How to "Reduce skin effect" patented technology

The invention relates to a Litz wire manufacturing method and a coil structure, a Litz wire is divided into an inner layer structure and an outer layer structure, the inside of the Litz wire is formed by twisting a plurality of mutually insulated wires, the outside of the Litz wire is covered by an insulating layer, the number of strands of the internally twisted wires is more than 2700, the diameter of a copper wire used for wire twisting is more than 0.2 mm, and the Litz wire is directly blanked and trimmed without winding and forming; according to the Litz wire, a pole-phase group is directly embedded in a stator iron core groove, and only two coil lead outgoing heads are arranged in the pole-phase group, so that welding among coils is reduced; and after the soft litz wire is embedded, the end part can be directly shaped, so that the soft litz wire can be orderly arranged in sequence.

The invention discloses a manufacturing method of a high-speed asynchronous motor rotor. A plurality of grooves are formed in the steel side wall of the rotor; brazing filler metal is sprayed on the surface of the conducting bar to obtain a sprayed conducting bar; assembling the spraying conducting bar into the groove to form an assembly body, wherein the conducting bar protrudes out of the side wall of the rotor steel; an outer lantern ring with the expansion coefficient smaller than that of the guide strip is sleeved outside the assembly body; vacuum diffusion welding is carried out, and the outer lantern ring extrudes the conducting bar under the difference of expansion coefficients of the outer lantern ring and the conducting bar; after vacuum diffusion welding is finished, the outer lantern ring is taken out to obtain a welded body; end ring areas are machined at the two ends of the welding body; the end ring area is sleeved with an end ring, the end ring and the welding body are combined, and the end ring is connected with the guide strip. The outer sleeve is arranged outside, axial extrusion force is provided for the conducting bar at the high temperature of vacuum diffusion, so that contact pressure adjustment needed by diffusion welding is achieved, and the welding strength of the conducting bar and a rotor steel assembly face is guaranteed; and the grooves are formed in the side surfaces, so that the conducting bars can be assembled deeper, and the skin effect is reduced.

The invention relates to the technical field of cables, and particularly discloses an environment-friendly polypropylene insulating flame-retardant medium-voltage cable which comprises a cable core and a protective structure layer arranged outside the cable core. The cable core is provided with three power insulation wire cores and three tensile wire cores which are twisted together, and a flame-retardant filling rope which is filled in a twisting gap of the three power insulation wire cores and the three tensile wire cores, and each tensile wire core is arranged at a twisting outer side gap of two adjacent power insulation wire cores; each power insulation wire core is composed of a conductor, and a conductor shielding layer, a polypropylene insulation layer, an insulation shielding layer, a shielding isolation layer, a metal shielding composite layer and a conductor core fireproof layer which are sequentially arranged outside the conductor from inside to outside. According to the invention, the medium-voltage cable formed based on the polypropylene insulating material effectively gives consideration to good tensile property and bending resistance, so that the convenience, flexibility and stability of the medium-voltage cable when the medium-voltage cable is used in a working condition environment are improved.

The present invention provides a wave-absorbing honeycomb core material and a wave-absorbing honeycomb core sandwich structure. The wave-absorbing honeycomb core material includes a honeycomb matrix, a resin bonding portion and a wave-absorbing material, wherein the resin bonding portion fixes the wave-absorbing material on the honeycomb matrix, and the wave-absorbing material is a surface-metallized hollow glass microsphere. The present application uses metallized hollow glass microspheres to replace the dielectric material and ferromagnetic material commonly used in wave honeycomb core materials in the prior art as wave absorbers. The metal-coated hollow glass microspheres have the advantages of low density and large specific surface area, and the hollow structure formed by loading the metal on the surface of the hollow glass microspheres has a thin metal coating on the one hand, which can effectively reduce the skin effect caused by the metal material, so that the electromagnetic waves can enter the interior of the wave-absorbing material, effectively improving the magnetic loss; on the other hand, after the electromagnetic waves enter the hollow microspheres, they will be reflected multiple times inside, further improving the absorption rate of the electromagnetic waves, thereby effectively improving the low-frequency wave absorbing performance.

The invention discloses a corrugated seven-segment cable core structure, a cable structure and a production process, the corrugated seven-segment cable core structure comprises a central conductor and seven tile-shaped separation strand block conductors, and the seven tile-shaped separation strand block conductors are twisted around the central conductor to form a cable core with a circular cross section; the center conductor and the tile-shaped separation strand block conductors are isolated through graphene insulation paper, and the adjacent tile-shaped separation strand block conductors are isolated through graphene insulation paper. According to the invention, the current transmission channel is obviously increased. Meanwhile, the current transmission capability of the cable is improved by adopting a central conductor and seven-segment corrugated split conductor structure; the insulation paper doped with the graphene is used in the cable conductor, and the graphene has extremely low relative permeability, so that the magnetic flux density in the conductor is reduced, the heat energy generated by the action of a magnetic field is reduced, and the current-carrying capacity and the working efficiency of the cable are improved; and meanwhile, the current can be more uniformly distributed in the conductor, the alternating-current resistance and phase loss of the cable core are reduced, and the transmission efficiency of the cable is enhanced.

The electrical connector (10) includes a pair of plates (20) having a first conductive plate (12) and a second conductive plate (14), each plate having a central portion (24) and two connecting lugs (32, 34). The connecting lugs of each plate extend longitudinally from opposite edges (28, 30) of the central portion and are laterally offset from each other. The first and second plates are stacked on top of each other, with the central portions overlapping and separated by a gap (36). The connecting lugs of the first and second plates on each of the opposite edge sides are laterally offset from each other. The electrical connector further includes an insulating structure comprising a sandwich of electrically insulating material accommodated in the gap (36) between the central portions of the first and second plates.

The utility model discloses a motor stator, motor and flywheel energy storage device, motor stator includes: silicon steel sheet, is set up with cooperation groove on silicon steel sheet, is provided with first step portion and second step portion in cooperation groove, first step portion sets up in the slot mouth department of cooperation groove, and second step portion sets up in the one side of the slot mouth of cooperation groove away from first step portion of second step portion, stator coil is set up in cooperation groove, and stator coil is located in the one side of second step portion away from first step portion. Second step portion sets up in the one side of the slot mouth of cooperation groove away from first step portion, and stator coil is located in the one side of second step portion away from first step portion, so can make stator coil away from the slot mouth setting, can reduce the influence that high harmonic brings skin effect, solve the problem that the skin effect of slot mouth portion stator coil is big, reduce the heat output and ageing problem of stator coil, can avoid big magnetic flux leakage simultaneously, in addition can also weaken the heat of motor rotor, thereby can increase the life of motor.

The invention discloses a cable core structure, a cable structure and a manufacturing process, the cable core structure comprises a middle core wire, the periphery of the middle core wire is sequentially wrapped with a plurality of core wire layers, each core wire layer is formed by twisting a plurality of core wires, and the middle core wire and the core wires in each core wire layer adopt polyimide enameled copper wires; every two adjacent core wire layers are isolated through an insulating water-blocking tape, and the outermost core wire layer is wrapped by a wrapping tape. According to the invention, the energy transmission capability and the current-carrying capacity of the cable are obviously enhanced; an insulating water-blocking tape segmentation technology is introduced into the cable core design, so that the production process is simplified, the skin effect is effectively relieved, and the alternating-current resistance of the cable is reduced; polyimide with excellent heat resistance, solvent resistance, refrigerant resistance and high insulating property and copper with lower density and lower cost are adopted as the core wire core material of the cable, so that the manufacturing and mounting cost of the cable is reduced, and the production process is simplified.

The utility model discloses a motor stator, including stator core and flat wire, be equipped with a plurality of stator slot in the stator core, the flat wire is in the stator slot inner layer and is arranged, the cross section of flat wire is trapezoidal, the same layer includes two combined flat wire in the stator slot, the shape and size of flat wire in the stator slot are same. In the utility model, by setting the cross section of flat wire as trapezoidal, make the arrangement mode of flat wire in the stator slot more flexible and various, can adapt to different shape stator slot, and promote the slot full rate, reduce the skin effect influence.

A power distribution system includes phase and neutral lines, an AC power source, a first AC-passing DC blocker, a first DC power source, and a first AC-blocking DC-passing device. The AC power supply is electrically connected between the phase line and the neutral line. A first AC-through-DC blocker is electrically connected between an AC power source and a neutral line and includes a series LC filter having a capacitor and an inductor connected in series, where the AC power source and the AC-through-DC blocker form an AC path. The first DC power supply is electrically connected between the phase line and the neutral line. The first alternating current blocking direct current passing device is electrically connected between the first direct current power source and the neutral line and comprises a parallel LC filter, the parallel LC filter is provided with a capacitor and an inductor which are connected in parallel, and the first direct current power source and the first alternating current blocking direct current passing device form a direct current path; and the AC path and the DC path are mutually independent paths between the phase line and the neutral line.

The application discloses an electrode for electric spark machining of a micro-hole with a large depth-diameter ratio and a preparation method thereof, and belongs to the technical field of tool electrode preparation. The electrode comprises a tungsten wire rod, and the diameter of the tungsten wire rod is 0.1-0.4 mm. The tungsten wire rod is characterized in that a uniform and stable zirconium oxide insulation layer is arranged on the peripheral wall of the tungsten wire rod. The electrode selects the stable zirconium oxide layer as the insulation layer, which can enhance the insulation property of the peripheral wall of the electrode. On one hand, the electrode can reduce the discharge removal between the peripheral wall of the electrode and the side wall of the hole in the electric spark machining process, thereby improving the forming precision of the micro-hole. On the other hand, the electrode can reduce the skin effect of the current in the electrode and increase the current density of the center of the end surface of the electrode. Meanwhile, the end surface of the insulation layer has the conductivity in the electric spark discharge, electric spark discharge is generated to remove the material, and the electric spark machining efficiency is improved.

The invention relates to a heating mechanism, a cooking device and a heating control method. The heating mechanism comprises a machine body, an inner container, a first electrode assembly, a second electrode assembly and a connecting piece. The inner container is connected into the machine body in a matched mode, and a cooking cavity is formed in the inner container. The first electrode assembly is connected to the inner bottom wall of the cooking cavity in a matched mode. The connecting piece is telescopically connected between the inner top wall of the cooking cavity and the second electrode assembly. The second electrode assembly comprises a plurality of second electrodes, the number of the connecting pieces is multiple, and the connecting pieces and the second electrodes are in one-to-one correspondence and are detachably connected. According to the second electrode assembly, the to-be-cooked target can be divided into multiple parts to be heated, and the sectional area of each part and the corresponding second electrode in contact with each part is small, so that the influence of the skin effect is weakened, current with higher frequency can pass through each second electrode, and the heating efficiency is effectively improved.

A magnetic field control self-enhancement type electromagnetic emission device based on armature line guidance comprises a magnetic field enhancement module, a track module and an armature module, and the magnetic field enhancement module is arranged on the armature module and comprises a plurality of magnetic field enhancement units at specific intervals; the track module comprises two tracks which are arranged in a space in parallel; the armature module can move along the track direction. According to the device, the self-enhancement type electromagnetic emission device is controlled by the magnetic field guided by armature lines, in the moving process of the armature, the magnetic field enhancement unit on the armature plays a role in guiding the flow direction of current and increasing the density of current flowing through the armature, self-enhancement regulation and control of the magnetic field are achieved, the problem of non-uniform magnetic force distribution is solved, and therefore the Lorentz force borne by the armature is increased; the propelling efficiency is improved; meanwhile, good electric contact is achieved, contact pressure of the pivot rail is increased, contact resistance is reduced, and heat generated by the contact face of the pivot rail is reduced.

A therapeutic device for cell stimulation or cell therapy comprises a housing accommodating electrodes, a generator for generating high-frequency pulses, a processor unit comprising a control, regulation and calculation module, a memory unit, a control element, a controllable modulator by means of which the generator can be controlled. A voltage pulse sequence comprising a plurality of voltage pulses can be generated by means of the modulator, wherein the frequency of the voltage pulse sequence can be at least partially non-constant.

The utility model provides an electromagnetic induction coil, a device and a heating smoking set, comprising at least two Litz leads which are arranged side by side and have insulated surfaces, the Litz leads spirally extend and are wound into a multi-turn coil, and an accommodating cavity is formed in the coil along the extending direction; the first end of the coil is bent and then extends to be roughly flush with the second end in the extending direction, and the electromagnetic induction coil generates an induced magnetic field to heat the smoke cartridge in the power-on state. A circuit system can capture and process feedback signals conveniently, the diameter, the number of strands, the number of layers and the number of turns of an optimized electric conductor are flexibly set, a multi-turn coil with appropriate inductance and quality factors is wound, the skin effect and the proximity effect under high-frequency application are reduced, and the multi-turn coil has the advantages of being low in loss and high in reliability. The method is suitable for preparing an aerosol generating system with high working efficiency.

The present invention discloses a contactless wireless charging system for a robot astronaut, comprising a transmitter and a receiver. The transmitter is mounted on a charging platform of a spacecraft, and the receiver is mounted on an energy pack of a space robot; a battery management module is arranged on the energy pack to be connected to the receiver. The transmitter and the receiver exchange information through carrier communication, the inverter module of the receiver converts the DC power supply of the spacecraft bus into AC power, and the transmitting coil and the receiving coil complete the wireless and contactless transmission of electric energy through electromagnetic induction. The receiver is equipped with a battery management module to achieve high-precision charging and discharging and balanced control to ensure that the battery operates in a safe domain. During the charging process, no metal is directly exposed to the space environment, and the risks of short circuit, arcing, and mechanical interface jamming are completely eliminated, meeting the requirements of safety, stability, and adaptability to the space environment, realizing unmanned and intelligent stop-and-go charging and charge-and-go, and effectively improving the work efficiency of the robot astronaut.

This application belongs to the field of transformer equipment, specifically disclosing a casing for a high-power high-frequency transformer. The casing includes a base plate and a casing body, which is detachably mounted on the upper surface of the base plate. The casing body has a through-cavity for accommodating the high-frequency transformer. The top and side walls of the casing body have several slot structures. The accommodating cavity and all the slot structures are filled with a thermally conductive and insulating filler layer. Through the structural design of the casing for the high-power high-frequency transformer in this application, the annular path of eddy currents can be disrupted, the skin effect weakened, eddy current losses effectively reduced, heat dissipation efficiency accelerated, and the overall safety performance of the equipment improved.

The application discloses a movable emergency modular transformer substation, and relates to the technical field of transformer substations. The transformer substation comprises a shell, universal wheels, a voltage transformation mechanism and a temperature control mechanism. The voltage transformation mechanism and the shell are fixedly connected, the temperature control mechanism and the shell are fixedly connected, the temperature control mechanism and the voltage transformation mechanism are communicated, the shell and the universal wheels are fixedly connected, the universal wheels are located below the shell, and the temperature control mechanism is located on the periphery of the shell. The shell provides high-strength physical protection and support space for the whole device. The universal wheels located below the shell endow the transformer substation with flexible moving capability, so that the transformer substation can quickly respond to emergency demands. The voltage transformation mechanism is fixed in the shell to perform core voltage conversion operations. The temperature control mechanism located on the periphery of the shell and communicated with the voltage transformation mechanism can perform real-time thermal management on the internal environment of the shell, so that the voltage transformation mechanism can stably operate for a long time at a suitable temperature.

The utility model discloses a kind of intermediate frequency DC reactors, including magnetic core, coil, input conductive row and output conductive row, the magnetic core is oppositely equipped with two iron columns, the coil is equipped with two groups and is respectively wound on the two iron columns of the magnetic core, the coil is wound with thin wide metal foil and is formed, the input conductive row is located in the lower portion of this intermediate frequency DC reactor and is connected with the coil, the output conductive row is located in the upper portion of this intermediate frequency DC reactor and is connected with the coil. The utility model winding loss is small, and the heat dissipation performance is excellent, compact structure, high reliability, strong environmental adaptability, can be adapted to intermediate frequency working condition.

A driving motor stator winding insulation structure comprises an iron core, a stator groove is arranged in the iron core, a groove insulation layer is arranged on the groove wall of the stator groove, a single-strand conductor and a multi-strand conductor are arranged in the stator groove, the single-strand conductor is composed of a first wire, the first wire is wrapped by a single-strand conductor turn-to-turn insulation layer, and the multi-strand conductor is wrapped by a multi-strand conductor turn-to-turn insulation layer. The outer side of the multi-strand conductor is wrapped with a multi-strand conductor turn-to-turn insulating layer, the multi-strand conductor comprises at least two second wires, and the sectional area of the second wires is smaller than that of the first wires. According to the utility model, the multi-strand conductor is used for replacing a single-strand conductor, and the sectional area of each second wire of the multi-strand conductor is smaller than that of the first wire, so that the skin effect is reduced. The inter-turn potential difference between the second wires of the multi-strand conductor is isolated through the strand insulating layer, the multi-strand conductor and the single-strand conductor are isolated through the multi-strand conductor inter-turn insulating layer and the single-strand conductor inter-turn insulating layer, and therefore the proximity effect is reduced.

The invention discloses a magnetic bias suppression transformer which comprises a heat conduction plate, a first O-shaped magnetic core, a second O-shaped magnetic core and a third O-shaped magnetic core are sequentially fixed to the heat conduction plate side by side, each side column of the first O-shaped magnetic core is sleeved with a first framework, each side column of the second O-shaped magnetic core is sleeved with a second framework, each side column of the third O-shaped magnetic core is sleeved with a third framework, and the first framework and the second framework are sequentially fixed to the heat conduction plate. Secondary windings which are connected end to end are wound around each first framework and each second framework, a fourth framework is sleeved on the secondary windings wound around the second frameworks, primary windings which are connected end to end are wound around each third framework and each fourth framework, and an insulating layer is coated on the first O-shaped magnetic core, the second O-shaped magnetic core and the third O-shaped magnetic core; the linear inductors are respectively connected in series at two ends of the primary winding and the secondary winding to obtain excitation inductance, so that excitation inrush current is inhibited, the direct current magnetic bias phenomenon is improved, the assembly is convenient, and the space utilization rate is high.

This invention provides a stator assembly and a motor system having the same. The stator assembly includes: a stator core having multiple axially extending stator slots evenly arranged along the circumference of the stator core; a winding assembly including at least slot-in-slot Litz wires and end flat wires, the slot-in-slot Litz wires passing through the stator slots, and two end flat wires, each end of the slot-in-slot Litz wire connected to one of the end flat wires; and a busbar connected to one of the end flat wires. By applying the technical solution of this invention, due to the inherent structural characteristics of Litz wires, using slot-in-slot Litz wires can effectively reduce the skin effect of the winding assembly, thereby reducing the AC copper loss of the stator assembly, improving the power density and efficiency of the motor. The connection of the two ends of the slot-in-slot Litz wires to the end flat wires results in better end forming of the winding assembly, improving the manufacturing difficulty and height of the winding ends.

The invention discloses a metal foil, a metal-clad laminated board and a circuit board, the metal foil comprises a functional layer and a plurality of agglomerated teeth formed on one side surface of the functional layer, each agglomerated tooth comprises a plurality of agglomerated bumps, and at least part of the agglomerated bumps are spine-shaped; the sharp agglomerates can be better inserted into gaps of microcosmic particles of the substrate in the pressing process, so that the bonding force is better; wherein the maximum width of the agglomerated teeth is 2-15 [mu] m, the agglomerated teeth are large in size, and the agglomerated teeth are stably combined with metal foil crystal grains, can be more easily inserted into gaps of a substrate after being pressed, and are further stably combined with the substrate. The low roughness can ensure the transmission efficiency and reduce the skin effect. According to the embodiment of the invention, the binding force between the metal foil and the substrate can be improved, relatively low transmission loss is ensured, and the stability of the circuit board is improved.

The invention discloses a stator structure based on a multi-layer flat wire winding, which comprises a stator core and a plurality of motor windings, and is characterized in that a plurality of stator grooves penetrating through the two ends of the stator core along the axial direction are formed in the inner wall of the stator core along the circumferential direction; the motor winding comprises a plurality of layers of flat wire conductors which are distributed in the two stator slots at intervals; each layer of flat wire conductor comprises in-slot straight sections located in two stator slots, the corresponding ends of the two in-slot straight sections are connected through end connecting sections located outside the stator slots, and the other ends of the two in-slot straight sections are connected with the corresponding ends of the in-slot straight sections of the two adjacent layers of flat wire conductors through end connecting sections located outside the stator slots; the middle of the end connecting section is provided with a bending receding structure or an overturning transposition structure. Alternating current loss caused by the skin effect and the like can be reduced, the circulation effect is reduced, and therefore the motor efficiency is effectively improved.

The utility model belongs to underwater cable technical field discloses a kind of bending-resistant underwater cables, including conductor, insulating layer, sheath layer and protective layer, conductor is formed by multiple copper wire strands multilayer complex twisting, and the complex twisting direction of each layer copper wire strand is same, copper wire strand is formed by multiple tinned copper wire bundle twisting, insulating layer is coated in the outer periphery of conductor, sheath layer is coated in the outer periphery of insulating layer, protective layer is coated in the outer periphery of sheath layer, the material of protective layer is polyether polyurethane elastomer, shore hardness is (A80-D70).The bending-resistant underwater cable provided by the utility model has pressure resistance and flexibility simultaneously, when bending laying, it can be quickly laid, reduce the degree of difficulty of laying, simultaneously, it can effectively reduce the degree of stress concentration at bending, the risk of fracture at bending is low, and it can stably transmit electric energy.

The utility model discloses a low-energy-consumption medium-voltage cable, which relates to the technical field of medium-voltage cables and comprises a conductor, a belting layer is longitudinally wrapped on the secondary outer layer of the conductor, a conductor shielding layer is arranged on the outer layer of the conductor, a cross-linked polyethylene insulating layer is arranged on the outer surface of the conductor shielding layer, and the cross-linked polyethylene insulating layer is arranged on the outer surface of the cross-linked polyethylene insulating layer. According to the medium-voltage cable, through the arrangement of the wrapping tape layer, in the conductor twisting process of the medium-voltage cable, the non-woven fabric is longitudinally wrapped on the secondary outer layer of the conductor to form the wrapping tape layer, and the outer layer conductor and the secondary outer layer conductor are isolated by the non-woven fabric, so that the surface area of the conductor is enlarged; and meanwhile, after the non-woven fabric is longitudinally wrapped on the secondary outer layer, a barrier is formed on the secondary outer layer, and when the three layers are co-extruded, the inner screen does not enter the conductor due to extrusion pressure, so that the inner screen is not sunken, and the smoothness of a shielding interface and an insulating interface of the conductor is improved.