26results about How to "Reduce eddy current loss" patented technology

The utility model discloses a high-torque-density magnetic transmission speed reducer and a built-in motor of a power-assisted bicycle, and belongs to the power-assisted technology of bicycles. A magnetic transmission speed reducer and a motor in the prior art have the defects of large torque fluctuation, low transmission efficiency, easy magnetic field mismatch, uncontrollable eddy current loss and the like, the magnetic transmission speed reducer comprises a first stator, a first rotor and a modulation ring, the modulation ring is located between the first rotor and the first stator, a first air gap is kept between the modulation ring and the first stator, and a second air gap is kept between the modulation ring and the second stator. A second air gap is kept between the modulation ring and the first rotor, the modulation ring comprises modulation teeth, the total number of the modulation teeth is p2, the number of pole pairs of the first stator magnetic ring is p3, the number of pole pairs of the first rotor magnetic ring is p1, p1 = p2-p3, a magnetic field of the first air gap is coupled with a magnetic field of the second air gap, and rotation from the first rotor is output in a speed reduction mode through the modulation ring. The motor part and the reduction gear realize transmission through magnetic force, thereby improving the motor operation efficiency and reducing the overall noise of the motor.

This utility model relates to an assembled cylindrical iron core, a primary component, and a linear motor. Extending axially, its cross-section is a polygonal ring, with the outer ring's edges corresponding to the inner ring's edges. The iron core is formed by sequentially assembling multiple core units circumferentially. Each core unit has a quadrilateral cross-section, with a first, second, third, and fourth side in sequence. The first and third sides are parallel, with the first side located inside the assembled cylindrical iron core and the third side located outside. The surfaces containing the second and fourth sides of each core unit are coated with an insulating layer. This utility model is based on the idea of ​​assembling a polygonal linear motor from flat linear motors. By segmenting and cutting the eddy current loop, it actively reduces eddy current losses, lowers thrust loss and eddy current losses under high operating speeds, and optimizes motor heating.

This invention discloses a high-frequency, low-loss planar transformer core structure, relating to the field of planar transformer technology. It includes a multi-layered outer shell; a core support component is adjustable on the top of the multi-layered shell; modular core components are mounted and fixed on the core support component; magnetic flux at the air gap edge is eliminated through a composite magnetic circuit of ferrite and soft magnetic composite materials, reducing eddy current losses; and elastically pre-tightened core columns ensure magnetic circuit stability. A three-stage heat dissipation system is employed, consisting of heat pipe equalization, microchannel liquid cooling, and shell radiation, reducing the hot spot temperature difference to within 5°C and achieving a thermal resistance of only 0.05 K / W. Elastic gaps compensate for assembly tolerances and thermal expansion, guide locking enables precise positioning, and shock absorbers attenuate vibration by more than 80%. Integrated temperature, pressure, and strain sensors provide over-temperature protection, dynamic heat dissipation, and stress warning.

An enhanced heat dissipation, low-loss, high-speed permanent magnet motor rotor structure comprises a solid shaft body, permanent magnets, and a carbon fiber protective sleeve. The solid shaft has spaced-apart rotor cooling rings and rotor dynamic balancing rings; the permanent magnets are mounted on the solid shaft body; the carbon fiber protective sleeve is assembled using a high-tension winding method; the permanent magnets have an unequal thickness structure, with their thickness distributed sinusoidally, and their outer surface is circular. In the rotor structure, the rotor cooling rings and rotor dynamic balancing rings are in direct contact with the cooling fluid in the air gap and the unequal-thickness permanent magnets, enabling the heat from the permanent magnets to be conducted to the cooling fluid through heat conduction and convection. Furthermore, the unequal-thickness permanent magnets improve the sinusoidal magnetic flux density of the air gap, effectively suppressing rotor eddy current losses. The combination of rotor loss suppression measures and high-efficiency rotor cooling technology achieves efficient thermal management of the high-speed permanent magnet motor rotor from both loss suppression and cooling perspectives.

The application discloses a kind of stator core, stator, motor and compressor, it is related to motor technical field, wherein, stator core includes multiple laminated punching sheet, the outer circle of each punching sheet is equipped with multiple cutting edge, multiple cutting edge is equipped with a pair of riveting slot, multiple cutting edge is also equipped with welding site, multiple punching sheet is welded together by welding site;Two the pair of riveting slot is respectively arranged in the opposite side of stator core, the center of groove bottom of two the pair of riveting slot is respectively connected with the center of circle of stator core and is recorded as AO and BO, the included angle of AO and BO is θ1, θ1 satisfies 120 ° < θ1 ≤ 180 °.The technical scheme provided by the application can guarantee that stator core does not scatter piece and improves the manufacturing yield of motor at the same time, reduces the eddy current loss generated due to rivet, to improve motor efficiency.

The embodiment of the application relates to the technical field of inductance elements, in particular to a soft magnetic composite material, a preparation method of the soft magnetic composite material, a preparation method of an inductor and the inductor. The inductor can be prepared by sintering treatment of the soft magnetic composite material by using a sintering process. The first coating layer of the soft magnetic composite material is the main source of insulation performance of the soft magnetic composite material, and can effectively reduce the eddy current loss of the soft magnetic composite material. In the process of sintering treatment of the soft magnetic composite material to prepare the inductor, the ferromagnetic coating material of the second coating layer not only can play a role in protecting the first coating layer to reduce the phenomenon of cracking or falling off of the first coating layer in the sintering process, but also can play a role in engaging and bonding the solid pyrolysis product of the third coating layer, and improve the cracking or fracture of the inductor caused by pyrolysis of the organic insulating material of the third coating layer in the sintering process. The fourth coating layer is used for further reinforcing the insulation performance of the soft magnetic composite material.

The invention discloses an overlapping stimulation coil assembly and system for biological electromagnetic stimulation, and relates to the technical field of biological electromagnetic stimulation. The assembly comprises a lower-layer stimulation coil and an upper-layer stimulation coil which are vertically placed above a biological electromagnetic stimulation target area, the upper-layer stimulation coil and the lower-layer stimulation coil have the same geometric structures similar to semicircular coil structures, and the upper-layer stimulation coil and the lower-layer stimulation coil are arranged in an overlapped mode. The arc part of the lower-layer stimulation coil, the arc part of the upper-layer stimulation coil, the straight long shaft part of the lower-layer stimulation coil and the straight long shaft part of the upper-layer stimulation coil are sequentially arranged from bottom to top, and the upper-layer stimulation coil and the lower-layer stimulation coil are used for being connected with excitation current through different discharging circuits so as to jointly achieve a biological electromagnetic stimulation effect on a target area. Therefore, the focusing property of the stimulation coil can be improved, the intracranial stimulation depth can be enhanced, the adverse effect on a non-target area can be effectively weakened, and the safety of transcranial electromagnetic stimulation treatment can be ensured while the stimulation intensity reaches the stimulation threshold value.

This invention discloses a MEMS synthetic jet heat sink and array heat sink based on an asymmetric dual-diaphragm and a top-surface through-flow channel, comprising a PCB substrate, a silicon substrate, a first piezoelectric diaphragm, a second piezoelectric diaphragm, and a top frame. The lower surface of the PCB substrate is used for mounting to a heat source and is a complete plane; the silicon substrate is disposed on the PCB substrate, and a vibration cavity is formed within the silicon substrate; the first and second piezoelectric diaphragms are sealed and connected to the silicon substrate, and together enclose the vibration cavity; the two piezoelectric diaphragms are arranged asymmetrically relative to the PCB substrate; the top frame is disposed above the first and second piezoelectric diaphragms and connected to the PCB substrate; the top frame has an opening; the opening communicates with the vibration cavity, together forming a top-surface through-flow bidirectional channel, so that the air intake and exhaust processes of the heat sink are completed through the top-surface through-flow bidirectional channel.

The utility model relates to the technical field of power cables, and discloses a special-shaped stranded conductor power cable and a stranding processing device thereof.The special-shaped stranded conductor power cable further comprises a cable conductor, the outer side of the cable conductor is fixedly connected with an insulating layer, the outer side of the insulating layer is wrapped with a first wrapping tape, and the outer side of the first wrapping tape is wrapped with a second wrapping tape. And a filling layer is arranged between the first wrapping tape and the insulating layer. The twisting processing device comprises a bottom plate, and further comprises an inserting rod and a twisting assembly, the top of the bottom plate is fixedly connected with a supporting plate, the top of the bottom plate is fixedly connected with a twisting cylinder, the inserting rod is pulled out from the interiors of a U-shaped seat and a wire roller body through a shifting block, the wire roller body is convenient to replace, and the twisting efficiency is improved. The through holes of the wire roller body are aligned and inserted into the through holes of the U-shaped seats, then the clamping blocks are clamped into the annular grooves of the inserting rods, the inserting rods are limited, the inserting rods can only rotate, and replacement of the wire roller body is completed.

The invention discloses a motor rotor and a motor applying the same, and relates to the technical field of motors, the motor rotor comprises an annular magnet yoke and magnetic steel, the magnetic steel is arranged on one side, close to a motor stator, of the magnet yoke, the magnet yoke comprises a plurality of magnetic pole groups, and the plurality of magnetic pole groups are arranged according to a Halbach array; the magnetic field intensity of an air gap area between the motor rotor and the motor stator is enhanced; the magnetic pole groups are used for replacing silicon steel sheets, so that an iron core part is omitted, the occupied space is reduced, the structural compactness of the rotor is improved, the magnetic induction intensity is increased, the magnetic field energy density is improved, the motor can output higher power under the same volume, and the motor is suitable for high-power-density application scenes; in addition, the magnetic pole sets are arranged in a Halbach array mode, magnetic flux is effectively concentrated, magnetic induction intensity in air gaps is improved, interference of reverse magnetic flux is reduced, the motor can utilize a magnetic field more efficiently in the operation process, output power is improved, meanwhile, loss of the motor is reduced, and therefore the overall performance and efficiency are improved.

The utility model relates to the technical field of induction cookers, in particular to an efficient energy-saving novel functional induction cooker, which comprises a cooker body, a coil and a cooling fan, the coil and the cooling fan are arranged in the cooker body, and a mounting ring is fixedly mounted in the cooker body and positioned on the outer side of the coil; and a magnetic leakage prevention assembly for reducing magnetic leakage of the coil is arranged in the mounting ring and comprises a silicon steel sheet and an insulating plate which are arranged in the mounting ring. By arranging the magnetic leakage prevention assembly, when the induction cooker is used, magnetic leakage generated by the coil outwards can be intensively guided to a pot by the silicon steel sheet, so that the heating efficiency of the pot is higher, the magnetic leakage is prevented, the energy consumption is reduced, the induction cooker is more efficient and energy-saving, and the service life of the induction cooker is prolonged. Meanwhile, the silicon steel sheets and the insulating plates are arranged in a staggered mode, so that the silicon steel sheets are insulated and stacked, a more continuous magnetic circuit can be formed, the overall magnetic conductivity is improved, the magnetic field intensity is enhanced, and the heating effect of the cookware is better.

The application discloses a low-pressure forming high-frequency low-loss SMC magnetic powder core and a preparation method and application thereof, wherein amorphous iron-based alloy fine powder is added into iron-silicon-chromium coarse powder, different contents of nano calcium carbonate are added into the compounded magnetic powder, and then high-content epoxy resin is melted and mixed in a mixing mill to obtain a high-fluidity mixing material.After crushing, a low-pressure forming high-frequency low-loss SMC granular material is obtained, which is formed by hot pressing under low pressure, and the obtained annular magnetic powder core is annealed in a vacuum oven, so that the low-pressure high-frequency low-loss SMC magnetic powder core is obtained.Through the method, the SMC magnetic powder core with a forming pressure less than 50 MPa and a magnetic loss less than 2100 kW / m 3 under the conditions of 20 mT and 2 MHz can be obtained.

The utility model discloses a compact high -voltage outgoing line cabinet relates to transformer manufacturing technical field, aims at solving the low space utilization of existing equipment, poor heat dissipation, insufficient reliability and other problems. It includes cabinet body, top cover and base, and the cabinet body is divided into upper, middle, lower layer space through mounting panel, and the lower layer is equipped with lower disconnecting switch, and the contact blade is inner circular arc shape, and is matched with the linkage plate and lock catch structure, reduces the space occupation and promotes the operation accuracy, and the top cover is split type, and forms efficient heat dissipation system with the base cavity, and can switch heat dissipation mode according to temperature, and the integrated control panel, observation window and operating lever are convenient for operation and maintenance. The utility model improves space utilization, power transmission efficiency and equipment stability through the modularization stratification, structural innovation and heat dissipation optimization, and reduces the cost.

This invention discloses a film capacitor with dual electronic control including a power relay, EMC filtering, and heat dissipation device, belonging to the field of capacitor technology. The film capacitor includes a casing, an EMC filtering component, and a copper busbar assembly. The copper busbar assembly includes a first positive copper busbar and a second positive copper busbar, which connect two separate circuits into a dual electronic control circuit. This allows for more reliable logic control with simplified hardware, resulting in high sensitivity and good coordination for controlling subsequent equipment. After assembly, this capacitor reduces the number of electronic components, saving space. Furthermore, the centralized control logic reduces the number of fault points, making subsequent fault diagnosis easier and reducing energy consumption from redundant components.

The invention discloses a process method for inhibiting eddy current on the surface of a permanent magnet of a high-speed permanent magnet motor rotor, and belongs to the field of motor design. The problems of heating and demagnetization of the surface of a rotor permanent magnet in the motor are solved; according to the process structure of the permanent magnet of the permanent magnet motor rotor provided by the invention, the conductor on the surface of the permanent magnet is divided into small blocks by carving the shallow grooves on the surface of the permanent magnet, and the generation of large eddy current on the surface of the permanent magnet of the motor rotor is inhibited; the motor is used for reducing heat and loss in the motor and solving the demagnetization problem of the permanent magnet.

The utility model discloses a high -end inverter high -current end piece formula capacitor, including by the core, and the capacitor shell that cladding setting in the capacitor main part of core outside is constituted, the both ends of core are connected with the connecting terminal through the electrode sheet, and the connecting terminal is including the terminal main part, and is set up in the head of terminal main part, and with the plug connector of electrode sheet connection, the tail of plug connector is equipped with the card hole. The utility model solves the problem of insufficient of capacitor in prior art to the high current resistance, and the high heat release, the fast temperature rise and the short service life.

The invention discloses an insulating material for a light submarine cable, a preparation method of the insulating material and the light submarine cable, and relates to the technical field of submarine cables. The insulation material for the light submarine cable prepared by the invention is prepared from the following raw material components in parts by weight: 65.4 to 65.6 parts by mass of modified polypropylene, 13 to 15 parts by mass of modified boron nitride, 19 to 21 parts by mass of a composite flame retardant and 0.4 to 0.6 part by mass of an antioxidant, wherein the modified polypropylene is obtained by modifying polypropylene with allyl-terminated cyclotriphosphazene; the modified boron nitride is obtained by modifying hydroxylated hexagonal boron nitride with vinyl trimethoxy silane; the composite flame retardant is prepared by compounding 12.92 to 14.28 parts by mass of ammonium polyphosphate and 6.08 to 6.72 parts by mass of melamine; the insulating material prepared by the invention is relatively good in flame retardance, thermal conductivity and mechanical property.

The invention discloses a solid magnetic pole salient pole synchronous motor rotor, belongs to the technical field of motors, and aims to solve the problem that the running efficiency of a motor is affected due to large eddy current of an existing solid magnetic pole synchronous motor. The rotor comprises a rotor core, a magnet exciting coil and damping cage units, one damping cage unit is arranged below each magnetic pole, and each damping cage unit is composed of a plurality of damping bars and damping rings at the two ends; 2P rotor teeth are uniformly distributed along the circumferential direction of the rotor core, P is the number of pole pairs, and an annular excitation coil is wound on each rotor tooth; the pole shoes of the rotor teeth are provided with 2M + 1 damping grooves along the outer arc surfaces, the damping grooves are axial semi-closed round bottom grooves, and the central damping groove is arranged at the central axis of the rotor magnetic pole; the N damping grooves are symmetrically formed in the two sides of the pole body of the rotor tooth, grooving treatment is carried out, the damping grooves are arranged to be semi-closed grooves, the damping strips are placed in the damping grooves, and grooving on the surface of the rotor and placing of the damping strips are combined, so that eddy current loss is reduced.

The present application relates to the technical field of electric machines, and especially relates to a stator slot wedge, a slot wedge injection mold and a stator. The stator slot wedge provided by the present application comprises a magnetic conducting part, the magnetic conducting part comprises a first insulating layer and a plurality of magnetic conducting bodies, the plurality of magnetic conducting bodies are arranged in sequence and at intervals, and each magnetic conducting body comprises a plurality of magnetic conducting sheets arranged in sequence and fixed, the plurality of magnetic conducting sheets are formed by stacking and riveting to form the magnetic conducting body, and the first insulating layer is filled between the adjacent two magnetic conducting bodies. The stator slot wedge provided by the present application avoids the magnetic conduction between the magnetic conducting bodies formed by stacking and riveting, thereby reducing the eddy current loop path, reducing the eddy current loss, and improving the efficiency of the electric machine.

The present application relates to the technical field of neutralizing device, and particularly relates to a low-power-consumption and long-life radio frequency neutralizer, which comprises a shell, one end of the shell is connected with a ceramic base and is provided with a discharge needle, a ceramic discharge chamber is arranged in the shell, a collector assembly is arranged in the ceramic discharge chamber, and a discharge needle isolator is arranged around the discharge needle; the collector assembly comprises an inner layer collector, a radial clearance is formed between the inner layer collector and the inner wall of the ceramic discharge chamber; the shell is provided with a double-layer staggered slit. The radial clearance is arranged, so that the ceramic wall deposition state and the collector electrical parameter change are decoupled, the bridging failure of the collector area is effectively inhibited, the metal sputtering particles are difficult to continuously deposit to the key insulation part along the straight path through the discharge needle isolator, the surface creepage path is prolonged, the risk is effectively reduced, the shell eddy current loss is reduced and the heat management capability is improved through the adoption of the slit type shielding shell and the double-layer staggered slit.

The application relates to an amorphous stator core, a motor and a vehicle. The amorphous stator core comprises a plurality of silicon steel sheets and a plurality of amorphous sheets. The plurality of silicon steel sheets and the plurality of amorphous sheets are alternately stacked along the axial direction of the amorphous stator core. The silicon steel sheet comprises a protruding piece located at the outer edge of the silicon steel sheet and extending outward along the radial direction of the silicon steel sheet, and used for connecting the shell of the motor. The axial direction is perpendicular to the radial direction. The scheme can improve the overall strength and safety of the amorphous stator core, and reduce the maintenance frequency of the motor during use. At the same time, the scheme can ensure better insulation effect between the stacked amorphous sheets, thereby further reducing the eddy current loss of the amorphous stator core, and further reducing the energy loss of the core during operation. Furthermore, the scheme can further reduce the radial stress of the amorphous sheet, and reduce the eddy current loss of the amorphous stator core.

The utility model belongs to the technical field of proton exchange membrane fuel cells, and particularly relates to a cathode flow field plate of a proton exchange membrane fuel cell for a new energy vehicle, a cathode flow channel is arranged on the cathode flow field plate, the cathode flow channel is snake-shaped and is divided into a snake-shaped flow channel and a snake-shaped rib plate, and the snake-shaped rib plate is arranged in the snake-shaped flow channel. A plurality of snakelike rib plates are arranged among a plurality of snakelike flow channels at intervals, spoilers are arranged in the snakelike flow channels at intervals, the spoilers vertically stand in the snakelike flow channels and reduce the width of local positions of the snakelike flow channels, a circle of sealing groove capable of being provided with a sealing ring is arranged outside the snakelike flow channel on the outermost side, and the sealing ring is arranged in the sealing groove. The cathode flow field plate is internally provided with a plurality of snakelike rib plates, the snakelike rib plates are provided with drainage grooves extending along the shapes of the snakelike rib plates, each snakelike rib plate is provided with a branch drainage hole, the cathode flow field plate is internally provided with a main drainage channel communicated with the branch drainage holes, and the main drainage channel extends out of the cathode flow field plate. According to the scheme, the problems of gas leakage, water logging blockage, insufficient mass transfer and the like are solved through geometric optimization of a flow channel, innovation of a turbulent flow mechanism and improvement of a drainage system.

The invention discloses a multi-section staggered strip-shaped hole motor rotor sheath, which is suitable for an inner rotor permanent magnet motor, and has double effects of axial segmentation and radial segmentation in the aspect of inhibiting eddy current loss. The protective sleeve is assembled on the surface of a motor rotor in an interference fit mode, the protective sleeve is divided into m sections at equal intervals in the axial direction, and m is a positive integer; and strip-shaped holes with specific lengths and widths are uniformly distributed in each section. According to the invention, the eddy-current loss of the rotor sheath can be obviously reduced under the condition that the mechanical strength requirement of the sheath is met, so that the efficiency of the permanent magnet motor is improved. Compared with a traditional sheath structure, the motor rotor sheath structure with the multiple sections of staggered strip-shaped holes has the advantages that eddy current loss in the sheath can be remarkably reduced, and the efficiency of a motor is improved.

This application discloses a motor rotor and a motor. The motor rotor includes a rotor core, multiple permanent magnets, and multiple conductor bars. The rotor core has multiple magnetic slots, which are spaced apart circumferentially along the rotor core. Each magnetic slot has a magnetic isolation slot at both ends. The multiple permanent magnets are respectively disposed in each magnetic slot, and the multiple conductor bars are respectively disposed in each magnetic isolation slot. By providing conductor bars at both ends of the permanent magnets, this application ensures that when the motor generates high-frequency current harmonics during operation, the eddy current generation area is mainly concentrated in the conductor bars due to the combined effects of the skin effect and the proximity effect. This reduces the eddy current loss of the permanent magnets in the motor rotor, lowers the temperature of the permanent magnets under the same operating conditions, and thus reduces the risk of demagnetization in the permanent magnet synchronous motor and improves the motor efficiency. Under the same operating conditions, the amount of permanent magnets used or the grade of permanent magnets can be reduced to lower the motor cost.

The magnetic field enhanced axial flux switching hub motor belongs to the technical field of permanent magnet motors. It is designed to solve the problems of poor motor fault tolerance, low motor torque density, and poor heat resistance in existing hub motors. It includes: the first rotor and the second rotor are of the same disc structure, and the intermediate stator is embedded between the first rotor and the second rotor; the intermediate stator includes: armature teeth are respectively arranged at both ends of the H-type stator core, and fault-tolerant teeth are arranged in the middle of the H-type stator core. The main permanent magnet is sandwiched between two adjacent armature teeth, the magnetizing permanent magnet is embedded inside the fault-tolerant teeth, and the armature winding is wound on the stator yoke between the armature teeth and the fault-tolerant teeth. The two adjacent main permanent magnets are magnetized by a tangential magnetization method with opposite magnetization directions, and the two adjacent magnetizing permanent magnets are magnetized by a tangential magnetization method with opposite magnetization directions. The present invention is used for hub motors.

This invention discloses a non-oriented silicon steel with excellent electromagnetic and mechanical properties and its preparation method, relating to the field of non-oriented silicon steel technology. The chemical composition of the non-oriented silicon steel, by weight percentage, includes: C ≤ 0.003%, Si: 3.15~3.55%, Mn: 0.4~0.6%, Als: 0.5~0.85%, Sn: 0.03~0.06%, S ≤ 0.005%, N ≤ 0.005%, Ti ≤ 0.005%, with the remainder being Fe and unavoidable impurities. The non-oriented silicon steel of this invention has a tensile strength Rm of 580~615 MPa and a magnetic induction B... 50 The high-frequency iron loss P is 1.663~1.678T. 1.0 / 400 The iron loss is 16.5~17.1W / kg, and the anisotropy of the iron loss P1.0 / 400 at each angle deviating from the rolling direction is ≤1.2W / kg.