38results about How to "Guaranteed electromagnetic performance" patented technology

A low-temperature matching co-firing method of ferrite and ceramic material belongs to the technical field of electronic components and relates to the low-temperature co-firing method (LTCC technology) of ceramics and the ferrite, in particular to the method for eliminating stress in the LTCC technology and realizing the matching co-firing of heterogeneous materials. The method controls the consistency of sintering densification characteristic parameters between the heterogeneous materials by adding BBSZ glass which is equal to 5 percent by weight of ferrite powder material in a tape-casting slurry formula of the ferrite as a matching co-firing assist agent, thereby realizing the matching sintering during the co-firing process. The method can effectively improve the low-temperature sintering densification characteristic parameters of the materials and realize the matching co-firing of the heterogeneous materials; meanwhile, the method has little effect on the electromagnetic property of the ceramics or the ferrite powder material. The method is characterized by simplicity, good operability, cheap prices, obvious effect and the like, thereby being capable of being widely used in the LTCC technology for producing various electronic components.

The invention discloses non-oriented silicon steel for sheet billet production and a manufacturing method thereof and belongs to the technical field of production of non-oriented silicon steel. The non-oriented silicon steel comprises the chemical components in percent by weight: less than or equal to 0.005% of C, less than or equal to 1.50% of Si, greater than or equal to 0.40% but less than or equal to 0.70% of Mn, greater than or equal to 0.050% but less than or equal to 0.55% of Als, greater than or equal to 0.0010% but less than or equal to 0.0030% of S, greater than or equal to 0.0010% but less than or equal to 0.0030% of N, less than or equal to 0.0015% of Ti and the balance Fe and inevitable impurities. By carrying out process treatment such as smelting, continuous casting, heating, hot continuous rolling, rolling, pickling, cold rolling, product annealing, straightening and withdrawing, insulating layer coating and stress-relief annealing on the raw materials of the componentsby adopting a sheet billet production flow, the non-oriented silicon steel which is low in iron loss and high in magnetic polarization with the Si content of being less than 1.5% and the Al content of being within 0.05-0.5% is obtained under a condition of not adding noble metals. After stress-relief annealing, the decreasing proportion of the iron loss is relatively high, so that the electromagnetic property of the non-oriented silicon steel can be further improved.

The invention discloses an orthogonal dual-polarized metal slot antenna array structure and an antenna array containing the structure, and solves the problem in the prior art that high-temperature welding formation is adopted to cause poor antenna precision, resulting in reducing the yield, limiting by the welded aluminum alloy material and reducing the mechanical strength of the antenna, or the assembly formation of spare parts is adopted, resulting in increasing the weight of the antenna, reducing the mechanical strength of the antenna and increasing the number of structural parts that are independent of electromagnetic properties, so as to narrow the scope of application. The antenna array structure comprises an antenna bottom plate, and a sub-structure unit mounted on the antenna bottom plate and interposed by horizontal radiating unit pieces and vertical radiating element pieces. The antenna array includes an antenna array structure. The antenna array structure and the antenna array have the advantages of simple structure, scientific and reasonable design and convenient use, and can effectively ensure the accuracy of the antenna to improve the production yield, effectively improve the mechanical structure strength, reduce the weight of the antenna, and ensure the electromagnetic performance of the antenna array to expand the applicable range.

The invention discloses a technological mandrel in an aluminum casting process of a squirrel-cage rotor of an asynchronous motor, and a method for manufacturing the squirrel-cage rotor by using the technological mandrel. The technological mandrel is called as a primary and secondary mandrel; the technological mandrel consists of a secondary mandrel part with convex keys and a primary mandrel which takes a smooth cylindrical surface as a main body structure; the secondary mandrel part and the primary mandrel part are matched with each other through a groove with a wedged oblique surface; and the direction of the wedged oblique surface is parallel to the axial direction of the rotor. According to the technical scheme of the invention, the flatness and linearity of the cylindrical surface in the inner hole of the aluminum cast rotor are guaranteed; and the squirrel-cage rotor manufactured in thermal jacket or cold pressing way can be prevented from reprocessing of the inner hole, and the labor cost and expenditure consumed by a cutter are reduced. For the occasion for producing the squirrel-cage rotor by virtue of common casting devices, by utilizing the method in invention, the products suitable for precision demands can be produced.

The invention discloses an X-band active array sub-array structure, and relates to the technical field of electronic countermeasure. The X-band active array sub-array structure comprises an antenna layer, a module layer, a cold plate and an auxiliary layer, wherein the antenna layer comprises sixteen optimized aperture antenna units which are arranged a mode of four by four rectangular arrays, themodule layer comprises four unit assemblies in a mode of two by two rectangular arrays, a cold liquid passage is arranged in the cold plate, via holes are further formed in the cold plate, the auxiliary layer comprises an auxiliary module fixedly arranged on a bottom surface of the cold plate, and the unit assemblies are connected with a circularly-circulated device and a power control module bya feeder penetrating through the via holes. The X-band active array sub-array structure has the characteristics of structure independence and function independence, flexible block-type building can beachieved, modular splicing is facilitated, and the X-band active array sub-array structure is suitably used for large-size equipment with overlarge power and low cost.

The invention discloses a non-oriented electrical steel leveling method capable of guaranteeing the magnetic property of products in the field of steel rolling. In order to guarantee the magnetic property of non-oriented electrical steel, the leveling elongation percentage is less than 0.1 percent, the unit width rolling force is from 80kN / m to 200kN / m, and the leveling tensile stress is from 10MPa to 30MPa. According to the characteristics of the non-oriented electrical steel that the transverse thickness difference is equal to 10 microns and the leveling elongation percentage is less than 0.1 percent, and in order to guarantee the uniform transverse distribution of rolling forces and improve produt surface quality, the non-oriented electrical steel is rolled by a working roller and a supporting roll which are in a shape of special function curve which is composed of a cosine function and an evenorder power function in a leveling machine. The invention does not increase the equipment improvemng investment and the production cost, is simple and easy to implement, and is especially suitable for the production of the non-oriented electrical steel on the common horizontal continuous anneal production lines.

The invention belongs to the technical field of motors and particularly relates to a winding type asynchronous motor and a manufacturing method. The problems of expansion stress difference between aniron core and a rotating shaft, magnetic short circuit and autorotation of a rotor after a power failure in an existing asynchronous motor are solved. The provided motor comprises a housing; a base isintegrally formed on the lower side wall of the housing; two hanging rings are welded to the upper side wall of the housing; a rotating shaft is arranged in the housing in a penetrating mode; a rotoris fixed to the outer wall of the rotating shaft; a stator arranged on the outer wall of the rotor in a winding mode is fixed in the housing; a mounting opening is formed in the connecting position of the housing and the rotating shaft; and a bearing is fixed in the mounting opening. By arranging the annular iron core, the motor is prevented from contacting the rotating shaft and expansion stressis reduced; by arranging mounting grooves and partition blocks, magnetic contact is avoided, and the electromagnetic performance is guaranteed; and by setting a magnetic plate and a reset spring, therotor is fixed during the power failure, and the safety performance is greatly improved.

The invention discloses low-iron-loss non-oriented silicon steel suitable for winding type machining and a production method of the low-iron-loss non-oriented silicon steel, and belongs to the technical field of silicon steel production. The non-oriented silicon steel comprises the following elements in percentage by mass: 1.5 to 2.5 percent of Si, 0.15 to 1.0 percent of Mn, 0.5 to 1.5 percent of Als and the balance of Fe and inevitable impurities. The production process comprises the steps of molten iron pretreatment, converter smelting, vacuum treatment and continuous casting. Heating and hot rolling; normalizing treatment; cold rolling and annealing; preserving heat and cooling; and coating with an insulating layer. The non-oriented silicon steel with excellent electromagnetic performance and elongation can be produced by optimizing the components and proportion of the non-oriented silicon steel in combination with process operation, so that the winding type processing and use requirements of the electrical steel can be effectively met, and the manufacturing process is short in flow and relatively low in cost.

The invention relates to oriented silicon steel and a preparing method thereof. The oriented silicon steel comprises, by weight, 0.030%-0.070% of C, 2.8%-3.5% of Si, 0.15%-0.30% of Mn, 0.35%-0.80% of Cu, 0.0040%-0.015% of S, 0.015%-0.025% of Als, 0.070%-0.015% of N, smaller than or equal to 0.020% of P, 0.002%-0.02% of Ti, and the balance Fe and inevitable impurities, wherein C / Ti is smaller than or equal to 10, and Cu / S is larger than or equal to 50. The preparing method comprises the steps of converter smelting, vacuum treatment, continuous casting, soaking pit heating, hot continuous rolling, first-time cold rolling, decarburization annealing, second-time cold rolling, MgO parting agent coating, high-temperature annealing and rewinding, the iron loss P1.7 of the oriented silicon steel is smaller than 1.18 W / kg, and the magnetic inductance B8 of the oriented silicon steel is larger than or equal to 1.86 T.

The invention relates to a high-capacity low-speed permanent-magnet wind-driven generator. According to the generator, multiple three-phase windings are used and integer slots are centralized to improve the coefficient of the windings and the utilization ratio of an iron core; the number of in-series turns per phase of the armature winding is increased to reduce the axial length of the iron core of a motor; and a permanent-magnet pole is dislocated or skewed to reduce tooth harmonic and pulsating torque. On the premise of ensuring that the electromagnetic performance of the generator and the complexity of the motor manufacturing process meet the requirements, the invention realizes material saving of the permanent magnet in the high-capacity low-speed permanent-magnet wind-driven generator, effectively reduces the cost of the motor, and provides directions for the popularization and application of the high-capacity low-speed permanent-magnet wind-driven generator.

The invention relates to a manufacturing method of cold-rolled non-oriented electrical steel, in particular to a hot rolling method of cold-rolled low-carbon low-silicon non-oriented electrical steel, which comprises the steps of finish rolling and reeling after finish rolling; the plate blank is rolled for at least three passes at the finish rolling process; the upper limit of the temperature ranges of two phase areas of austenite and ferrite of the plate blank is lower than 945 DEG C, and the lower limit thereof is higher than 925 DEG C; the rolling temperature of the first pass in the three continuous passes of the finish rolling of the plate blank is higher than 945 DEG C, the second pass does not conduct rolling, the rolling temperature of the third pass is lower than 925 DEG C, and the plate blank is cooled forcibly between the first and the third passes in the three continuous passes. The hot rolling method leads a common finishing mill group to be applicable for the productionof the cold-rolled low-carbon low-silicon non-oriented electrical steel, simplifies the control method, reduces the production cost, and is beneficial to the production and promotion of the cold-rolled low-carbon low-silicon non-oriented electrical steel.

The embodiment of the invention relates to a circuit board processing method, comprising the following steps of: fixing a conductive coil on a first core board, arranging the conductive coil between the first core board and a second core board, and for leading the ports of the conductive coil out of the surface of the circuit board, drilling at the position of the ports, and electroplating at thepositions of port leading-out holes to obtain an electroplated layer for leading the ports out of the surface. The embodiment of the invention also provides a corresponding circuit board. Thus, the conductive coil is embedded in the circuit board and is not exposed on the surface of the circuit board, no loss is produced when current is introduced as the conductive coil is not exposed in the air,the electromagnetic properties of PCB (Printed Circuit Board) products are guaranteed, and especially the invention can be widely applied in the power supply industry with high requirement for current density.

The off-line testing equipment of electromagnetic performance of long-stator linear motor includes a testing platform, on its surface a guideway is set, one end of said testing platform is equipped with a fixed supporting frame on which one end of a pulling sensor with high accuracy is connected, said testing platform also is equipped with several fastening bolts. Said off-line testing equipment also includes a rotor steel plate connected with the above-mentioned guideway by means of supporting frame, said rotor steel plate has several holes, every hole interior is equipped with a group of electrodynamic induction coils, every group container three electrodynamic induction coils, and every induction coil is series-connected with A.C. electric meter. The long-stator to be tested is fixed on the testing platform.

The invention discloses an exhaust device. The exhaust device includes multiple diffuser tubes and a mounting plate, each diffuser tube is composed of a straight tube segment and a horn opening, eachstraight tube segment is connected with a fuel tank venting pipe, each horn opening is fixedly connected to the mounting plate, and multiple vent holes communicated with the diffuser tubes are formedin the mounting plate. The diameter of each vent hole is smaller than 5 mm. The exhaust device fits the surface skin of an airplane to achieve connection with the fuel tank venting pipe, and the circulation area of the combined vent holes is far more greater than the sectional area of the fuel tank venting pipe, low resistance of gas circulation is ensured, the problem that the venting functionaldesign of existing fuel tanks needs vent holes to stretch out of the surface skin of airplanes is solved, and meanwhile the electromagnetic performance requirements for the vent holes can be guaranteed.

The invention relates to a manufacture method of cold-rolling non-oriented electrical steel, in particular to a hot rolling method of cold-rolling low-carbon non-oriented electrical steel, comprising a finishing step and a coiling step after the finishing step. At least two passes of rolling are carried out on a plate blank in the finishing step; two phase regions of the austenite and the ferriteof a plate blank have a temperature range with an upper limit lower than 900 DEG C and a lower limit higher than 850 DEG C; and the plate blank is forcefully cooled between two adjacent passes in thefinishing step and has a rolling temperature higher than 900 DEG C in the prior pass and a rolling temperature lower than 850 DEG C in the later pass. The hot rolling method enables a common finishing mill group to be suitable for the production of the cold-rolling low-carbon non-oriented electrical steel, simplifies the control method, decreases the production cost and is beneficial to the production and the popularization of the cold-rolling low-carbon non-oriented electrical steel.

The invention provides a millimeter wave frequency band rectangular horn antenna substructure and an N-element antenna array. The substructure comprises a main body structure, the bottom end of the main body structure is V-shaped, the two sides of the main body structure are respectively a ridge cover side and a ridge box side, the ridge cover side is provided with a straight waveguide section and a rear cover plate, the rear cover plate is installed on any side of the V-shaped main body structure, the straight waveguide section extends to the rear cover plate from the side top end of the ridge cover, a blind hole is formed in the tail end of the straight waveguide section located at the rear cover plate, a through hole is formed in the rear cover plate, and the through hole corresponds to the blind hole in position; the ridge box side comprises a groove and a straight waveguide section arranged in the groove, and the straight waveguide section of the ridge box side extends from the top end of the ridge box side to the side, without the rear cover plate, of the V shape at the bottom end of the main body structure. According to the scheme, the wall thickness of the horn mouth part is kept to the maximum extent, the manufacturing difficulty of the horn mouth part is effectively reduced, the horn mouth part is particularly suitable for structural design and manufacturing of a small-size and high-precision rectangular horn antenna array of a millimeter wave frequency band, and arraying of any number of unit antennas can be achieved.

The invention discloses low-temperature rapidly sintered soft magnetic ferrite and a preparation method thereof. The preparation method comprises the following steps: S1, weighing the following components in parts by mole: 60-80 parts of ferric oxide, 40-60 parts of zinc oxide, 30-50 parts of copper oxide and 15-20 parts of manganese carbonate, and performing mixing ball-milling till the average particle size is 5-30 [mu]m so as to obtain mixed powder; S2, pre-sintering the mixed powder at 900-1000 DEG C so as to obtain a pre-sintered material; S3, weighing yttrium oxide, aluminum oxide and lithium carbonate as doping materials; S4, adding the doping materials weighed in the step S3 into the pre-sintered material, performing secondary ball-milling for 6-8 hours, drying, adding polyvinyl alcohol, and performing pelletizing so as to obtain a granular material; S5, heating the granular material to sintering temperature in the presence of an air atmosphere, and performing warm-keeping sintering, thereby obtaining the low-temperature rapidly sintered soft magnetic ferrite, wherein the sintering temperature meets the equation that T=1454 / [1g(X+2Y+Z)+t]. Due to mutual cooperation of the main material and the doping materials, a preparation process is optimized, the sintering temperature is reduced, and meanwhile the electromagnetic properties of the ferrite are ensured.

The invention relates to a manufacture method of cold-rolling non-oriented electrical steel, in particular to a hot rolling method of cold-rolling low-carbon non-oriented electrical steel, comprising a finishing step and a coiling step after the finishing step. At least three passes of rolling are carried out on a plate blank in the finishing step; two phase regions of the austenite and the ferrite of a plate blank have a temperature range with an upper limit lower than 900 DEG C and a lower limit higher than 850 DEG C; and the plate blank has a rolling temperature higher than 900 DEG C in the first pass, no temperature in the second pass and a rolling temperature lower than 850 DEG C in the third pass of the three continuous passes in the finishing step and is forcefully cooled between the first pass and the third pass of the three continuous passes. The hot rolling method enables a common finishing mill group to be suitable for the production of the cold-rolling low-carbon non-oriented electrical steel, simplifies the control method, decreases the production cost and is beneficial to the production and the popularization of the cold-rolling low-carbon non-oriented electrical steel.

The invention discloses a Fe / ZrH 2 Nanocrystalline composite particles, which are composed of carbonyl iron powder and ZrH 2 Particles are the main raw material, which is easily prepared by ball milling + stirring milling. The present invention works by combining ZrH 2 The stabilization of particles on the microscopic grain boundaries of carbonyl iron powder, the control technology of Zr element content and the control technology of Zr distribution, to obtain Fe / ZrH with temperature resistance 2 composite particles; the Fe / ZrH 2 After heat treatment at 500 °C for 1 h, the grain size of the composite particles is within 20 nm, the electromagnetic parameters of 2-18 GHz do not change significantly, and the composite particles have good temperature resistance.

The invention discloses an orthogonal dual-polarized metal slot antenna array structure and an antenna array containing the structure, and solves the problem in the prior art that high-temperature welding formation is adopted to cause poor antenna precision, resulting in reducing the yield, limiting by the welded aluminum alloy material and reducing the mechanical strength of the antenna, or the assembly formation of spare parts is adopted, resulting in increasing the weight of the antenna, reducing the mechanical strength of the antenna and increasing the number of structural parts that are independent of electromagnetic properties, so as to narrow the scope of application. The antenna array structure comprises an antenna bottom plate, and a sub-structure unit mounted on the antenna bottom plate and interposed by horizontal radiating unit pieces and vertical radiating element pieces. The antenna array includes an antenna array structure. The antenna array structure and the antenna array have the advantages of simple structure, scientific and reasonable design and convenient use, and can effectively ensure the accuracy of the antenna to improve the production yield, effectively improve the mechanical structure strength, reduce the weight of the antenna, and ensure the electromagnetic performance of the antenna array to expand the applicable range.