68results about How to "Reduce electromagnetic losses" patented technology

The invention relates to a sandwich structure wave-absorbing composite material and a preparation method thereof, an integrated sandwich structure comprises an intermediate layer, an upper skin and alower skin, the intermediate layer is a honeycomb material filled with carbon nanotube/cellulose wave-absorbing foam, the upper skin is a quartz fiber cloth reinforced resin material having electromagnetic wave transmission characteristics, and the lower skin is a carbon fiber cloth-reinforced resin material having electromagnetic wave reflection characteristics. Specifically, the preparation method is carried out according to the following steps: 1. the intermediate layer, namely the honeycomb material filled with the carbon nanotube/cellulose wave-absorbing foam is prepared by a freeze-drying method; 2. the upper kin and the lower skin are prepared by impregnating resin with quartz fiber cloth/carbon fiber cloth; and 3. the intermediate wave-absorbing layer is compounded with the upper kin and the lower skin. The sandwich structure wave-absorbing composite material prepared by the method can replace existing wave-absorbing materials, and is widely used in aircrafts, ground weapon equipment, surface ships and other parts that have stealth requirements for electromagnetic waves.

A megawatt-level semi-direct driving wind generator comprises a wind wheel, a distance changer, a main axle, a speed accelerating box, a coupler, a generator, a cabin chassis, a bias motor and a control system. The chassis is fixed with the bias motor and the generator, the accelerating box is fixed with the side wall of the chassis, the accelerating box is first-stage planet accelerating gear box, and the motor is low-speed permanent magnetic three-phase synchronous generator. The invention can stabilize the transmission of transmitter, reduce impact, and reduce sealing demand or the like, with adjustable installed height, simple structure, high strength and accurate angle control on distance change as 0.1 degree, to output constant power.

The invention discloses an intelligent high-speed motorized spindle realizing integration of multi-parameter detection. The intelligent high-speed motorized spindle comprises a rotating shaft, a stator and a rotor, wherein the rotating shaft is arranged inside a housing; the stator is fixed to the inner wall of the housing; the rotor is installed on the rotating shaft; the stator and the rotor cooperate with each other to realize rotation of the rotating shaft; the rotating shaft is supported by a front bearing and a rear bearing which are installed at the two ends of the rotating shaft; the front bearing is installed inside a front bearing seat; the front bearing seat is installed at the front end of the housing; the rear bearing is installed inside a rear bearing seat; the rear bearing seat is installed at the rear end of the housing; dynamic running state parameters of the motorized spindle in an actual running process can be detected in real time by a first eddy current sensing unit of a temperature sensing unit which is arranged inside the motorized spindle; a pre-tightening force on-line regulating device which is arranged inside motorized spindle is used for implementing on-line regulation of the pre-tightening force of the spindle; and thus the motorized spindle can meet the use requirements on high speed and low temperature increment and low speed and high rigidity onthe premise of guaranteeing the machining precision.

The invention discloses an oxygen body material of nickel, zinc and ferrum with initial permeability being 100<-20><+20> and a preparation method thereof. The main phase of the material is spinel structure, and the material essentially consists of Fe2O3, ZnO, MnO, NiO and CoO, and the contents of composition calculated by oxide are: 46mol percent to 49mol percent of Fe2O3, 10mol percent to 16mol percent of ZnO, 0.1mol percent to 1.0mol percent of MnO, 33.7mol percent to 40mol percent of NiO and 0.3mol percent to 1.5mol percent of CoO; the oxygen body material of nickel, zinc and ferrum with initial permeability being 100<-20><+20> has broadband, low electromagnetic consumption and good temperature stability in larger working current; the material has extremely low electromagnetic consumption in high frequency ranging from 2.5MHz to 3MHz; as the oxygen body material of nickel, zinc and ferrum provided by the method of the invention has broadband, low electromagnetic consumption and good temperature stability in larger working current, the temperature coefficient thereof is less than 15.0 multiplied by 10<-6> with the temperature rranging from -20 DEG C to 100 DEG C, thus being beneficial to working stability of a power coupler; the oxygen body material of nickel, zinc and ferrum can also be used for producing various power couplers of high-frequency electrodeless lamps with the working frequency in range of 2.5MHz to 3MHz.

The invention relates to a method for dynamically regulating and controlling a metamaterial based on an IGZO Schottky diode. The IGZO Schottky diode comprises a substrate, a Schottky electrode, an amorphous indium gallium zinc oxide active layer and an ohmic electrode which are successively grown from bottom to top. The method comprises the following steps: (1) taking the metamaterial as the Schottky electrode, making the amorphous indium gallium zinc oxide active layer completely cover a capacitive structure in the metamaterial, and combining the capacitive structure in the metamaterial withthe amorphous indium gallium zinc oxide active layer to form a Schottky barrier; and (2) dynamically regulating and controlling the metamaterial through the IGZO Schottky diode processed in the step (1). In the invention, great dynamic modulation of electromagnetic characteristics including transmittance, reflectivity and absorptivity of the metamaterial is realized; and simultaneously, a resonantfrequency of a metamaterial structure design is not affected, the method can be applied to various metamaterial devices and plasmon devices with metamaterial structures, and dynamic regulation and control of electromagnetic waves transmitted in space and the electromagnetic waves transmitted on a surface is achieved.

A radar apparatus for a ship comprises a solid state transmitter and/or receiver enclosed within a housing, and an antenna coupled to the solid state transmitter and/or receiver. The external shape of the housing is substantially frusto-pyramidal. The frusto-pyramidal shape of the housing contributes to the robustness of the radar apparatus and allows the apparatus to have a low radar cross section.

The invention relates to a suspension hardware fitting for an optical phase conductor. The suspension hardware fitting comprises internal twisted wires, external twisted wires, a rubber fixture block, a cast aluminum shell, a socket clevis, an insulator string, a ball eye and a U-shaped suspension loop, wherein the external twisted wires clad the optical phase conductor; the external twisted wires clad the internal twisted wires; the rubber fixture block is arranged between the internal and external twisted wires; the cast-aluminum shell is arranged outside the rubber fixture block and the external twisted wires; the lateral surface of the cast-aluminum shell is sequentially connected with the socket clevis, the insulator string consisting of a plurality of series-wound insulators, the ball eye and the U-shaped suspension loop; the other end of the U-shaped suspension loop is connected with a tower and a fixed suspension hardware fitting; and the U-shaped suspension loop may be of an A type, a B type or a C type. The suspension hardware fitting provided by the invention is used for suspending an optical phase conductor cable on the tower; and due to the adoption of a pre-twisted suspension clamp, the suspension hardware fitting greatly improves the stress bearing capability of the optical cable on the basis of meeting a supporting function, and can prolong the service life of the optical cable.

The invention discloses a nickel zinc ferrite material with the initial permeability of 10+/-20 percent. A main phase of the material is a spinel structure, and the material comprises Fe2O3, ZnO, NiO and CoO; and the material is characterized by comprising the following components based on oxides: 46.5 to 49 mol percent of Fe2O3, 0.2 to 4.5 mol percent of ZnO, 44 to 49 mol percent of NiO and 0.3 to 2.5 mol percent of CoO. The nickel zinc ferrite material with the initial permeability of 10+/-20 percent has high frequency, low electromagnetic loss and high saturation magnetic flux density under large working current, can be used for manufacturing choking coils in a power generator of a high frequency electroless lamp. The material has extremely low electromagnetic loss at the working frequency of 2.65MHz of the high frequency electroless lamp, has the quality Q of more than 260 at the frequency of 2.65MHz, and has the power consumption of below 800kw/m<3> under the testing conditions of 1MHz and 10mT.

The invention relates to a converging and supporting structure of a dry electric reactor. The converging and supporting structure comprises busbars and a supporting frame. Each busbar comprises a vertical plate and connecting plates. The vertical plates are mounted at the bottom of an electric reactor body, every two connecting plates are symmetrically arranged at the two sides of the corresponding vertical plate, the busbars with the same structure are arranged on the upper portion and the lower portion of a dry electric reactor coil along the circumference of the coil in an arrayed mode, the connecting plates of the adjacent busbars are electrically connected in sequence, and a non-electric connecting position is reserved in the circumferential direction. A notch is formed in the upper portion of the supporting structure, the busbars mounted on the lower portion of the coil are mounted in the notch of the supporting structure, and the supporting structure corresponds to the busbars along the circumference array of the coil. Due to the fact that an outer converging structure is adopted, the limit of the dry electric reactor to temperature rise can be met well, the running safety of the dry electric reactor is guaranteed, the failure rate of the dry electric reactor is lowered, the earthquake-resistant capacity is high, and local overheating is avoided.

A wind turbine has an electric machine (6) in turn having a stator (10), and a rotor (11) which rotates about an axis of rotation (A2) with respect to the stator (10); the rotor (11) has a number of magnetized modules (25), and a number of supports (23) for supporting the magnetized modules (25) and arranged about the axis or rotation (A2); and wherein at least two of the supports (23) are parallel connected electrically.

The invention relates to a microwave dielectric ceramic material with high magnetic conductivity and a preparation method thereof. The ceramic material comprises a complex system (1-x)A(GazNb1-z)yTi1-yO3/(x)B(MnO4) composed of a main body A(GazNb1-z)yTi1-yO3 and a complex B(MnO4)3 wrapping the main body, wherein x is more than or equal to 0.20 mol but less than or equal to 0.50 mpl, and y is morethan or equal to 0.50 mol but less than or equal to 1.00 mol; A in the main body is one or more of Ni, Zn, Pb or Co; and B in the complex is one or more of Y, Yb, Fe, Ce, La or Lu. The preparation method of the microwave dielectric ceramic material provided by the invention adopts a microwave assisted sintering method, and the microwave dielectric ceramic material prepared by the method has a bimorphic crystal structure and a good microwave absorption property, and is low in electromagnetic loss, low in dielectric constant, high in magnetic conductivity and high in sintering speed.

The invention provides a super material which is stacked by at least one super material sheet layer; each super material sheet layer comprises a substrate, a bare board and multiple artificial microstructures arranged between the substrate and the hollow sheet, and the bare board is a plastic honeycomb board. According to the super material provided by the invention, the plastic honeycomb boards are used as a part of the super material sheet layers, the weight of the super material sheet layers is reduced; and as the honeycomb structure is hollow, the super material with the structure is also lower in electromagnetic loss.

The invention discloses a high-frequency pulse crude oil dehydration transformer for electrically dehydrating crude oil of an oil field and electrically raising high-frequency pulse with the frequency of 5,000-50,000Hz and the voltage of 500V into the voltage of 30,000V. The high-frequency pulse crude oil dehydration transformer is characterized in that a transformer iron core is formed by winding silicon steel strips with different thicknesses ranging from 0.03 mm to 0.20 mm respectively according to different positions of the silicon steel strips in the iron core and the vortex loss is reduced. In addition, the transformer has an integral explosion-proof structure, wherein the input end is in a safety-improving explosion-proof structure, and the output end and a transformer body are in oil-filling explosion-proof structures, thus the transformer meets the requirement of an oil-gas environment on electric equipment. Compared with the traditional transformer, the input and output voltage waveform of the high-frequency pulse crude oil dehydration transformer is the high-frequency pulse; the transformer has the advantages of wireless adjustment of output voltage, the frequency and duty factor, wide application range and stable running; and during treating complicated emulsion with strong conductivity, the transformer can ensure the stability of an electric field of a dehydrator, improve the dehydration effect of crude oil, and solve the dehydration difficult problem of the complicated emulsion in an oil field.

The invention discloses an oxygen body material of nickel, zinc and ferrum with initial permeability being 20<-4><+4> and a preparation method thereof. The main phase of the material is spinel structure, and the material essentially consists of Fe2O3, MnO, NiO and CoO, and the contents of composition calculated by oxide are: 46mol percent to 49mol percent of Fe2O3, 0.1mol percent to 1.0mol percent of MnO, 42.7mol percent to 49mol percent of NiO and 1.3mol percent to 2.5mol percent of CoO; the oxygen body material of nickel, zinc and ferrum with initial permeability being 20<-4><+4> has broadband, low electromagnetic consumption and good stability in larger working current and can be used for producing various power couplers of high-frequency electrodeless lamps with the working frequency in 80MHz; the material has extremely low electromagnetic consumption in high frequency ranging from 3MHz to 80MHz; when the frequency is 3MHz, the quality factor Q is more than 210; when the frequency is 80MHz, the quality factor Q is more than 100; due to good electromagnetic consumption characteristic in such wide frequency range, the oxygen body material has wide market prospect in a lighting system of novel electroless lamps.

The invention discloses a high-power density magnetic compression power generation mechanism. The high-power density magnetic compression power generation mechanism comprises a stator part and a rotorpart, wherein the stator part comprises first stator iron cores, and a plurality of second stator iron cores which are independent from the first stator iron cores and are vertically arranged; the plurality of second stator iron cores are distributed in parallel; a frame-free coil is arranged between the end part of each second stator iron core and the first stator iron core, and the gaps betweenthe plurality of second stator iron cores are communicated with the gaps between the plurality of frame-free coils to form a plurality of linear motion spaces; the rotor part comprises a plurality ofstrip-shaped permanent magnets which are in parallel and a rotor which is connected with the strip-shaped permanent magnets; and the plurality of permanent magnets are inserted into the linear motionspaces respectively, and high-frequency reciprocating movement is carried out under the driving of the rotor, so that the magnetic flux of the frame-free coils changes violently in the short time, and high electric potential is induced. The invention also discloses an electric generator comprising the power generation mechanism. According to the mechanism, the magnetic flux of the coil changes violently in the short time through high-frequency translation movement, so that high-power density power generation is realized.

The invention discloses a silicon-based gallium nitride microwave millimeter wave transmission line with low electromagnetic loss and a preparation method thereof. The silicon-based gallium nitride microwave millimeter wave transmission line comprises a silicon substrate, a III-nitride epitaxial layer, a high-frequency signal metal electrode and grounding metal electrodes, wherein the III-nitrideepitaxial layer is arranged on the upper surface of the silicon substrate; the high-frequency signal metal electrode is arranged on the upper surface of the III-nitride epitaxial layer; the groundingmetal electrodes are arranged on the two sides of the high-frequency signal metal electrode and/or the lower surface of the silicon substrate, an internal cavity is formed between the silicon substrate and the III-nitride epitaxial layer, and at least one part of the internal cavity is formed in the silicon substrate. The silicon-based gallium nitride microwave millimeter wave transmission line can effectively reduce the electromagnetic loss of a silicon-based gallium nitride material, improves the output power and efficiency of a silicon-based gallium nitride microwave millimeter wave device,and meets the application requirements of a microwave millimeter wave radio frequency circuit and system.