16results 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 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.

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 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.

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 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 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.

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.

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.