40results about How to "Avoid eddy current loss" patented technology

The invention relates to a film magnetoelectric composite material and a preparation method thereof, and belongs to the technical field of magnetic functional materials and preparation thereof. The magnetoelectric composite material is characterized by being prepared by compounding a magnetostrictive film layer, a conductive film layer and a piezoelectric ceramic substrate. In the preparation method, the magnetostrictive film layer is deposited on the piezoelectric substrate with a prepared electrode by physical vapor deposition (PVD) technology. The magnetoelectric composite material has high interfacial composite strength, a simple structure, a high magnetoelectric conversion coefficient, low high-frequency eddy current loss, stable performance and thin and light size, effectively avoids phase reaction between ferroelectric and ferromagnetic phases, and is particularly suitable for preparing a micro sensor; in addition, the preparation method is simple and feasible, and low in cost, and overcomes the defects of a complicated preparation process, high cost and the like of a laminated magnetoelectric composite material and the conventional film magnetoelectric composite material.

The invention discloses a low-loss half-closed trough type fault-tolerant permanent magnet cylinder linear motor and a machining method thereof. The system comprises a primary stage and a secondary stage. The length of the primary stage is smaller than the length of the secondary stage. An air gap is formed between the primary stage and the secondary stage. The primary stage is composed of a yoke part and teeth, wherein the teeth are composed of armature teeth and fault-tolerant teeth. The end portions of the teeth are provided with pole shoes. A coil winding is arranged in a tooth space. The armature teeth and the fault-tolerant teeth are the same in number and are arranged in a staggered manner. The primary stage is composed of a primary stator iron core and the primary stator iron core is composed of silicon steel sheets and an electrical pure iron. The secondary stage is composed of a permanent magnet and a secondary iron core. The permanent magnet is embedded in the secondary iron core. The secondary iron core is composed of axially laminated silicon steel sheets. Each silicon steel laminated sheet is divided into a plurality of fan-shaped laminated pieces. The inner diameter of each secondary silicon steel sheet is smaller than the inner diameter of the secondary permanent magnet. According to the invention, the low-loss half-closed trough type fault-tolerant permanent magnet cylinder linear motor is convenient to machine and manufacture, and the designing and machining cost of the motor is reduced. Meanwhile, the efficiency of the motor is improved on the basis that the performance of an original permanent magnet embedded cylindrical linear motor is ensured.

The invention relates to the field of motor design and manufacture, in particular to a permanent-magnet surface-mounted motor rotor with fixed plates. The motor rotor mainly aims to solve the technical problems that when the motor in prior art has relatively high rotational speed, both the permanent magnets and the fixed plates have comparatively large loss, and the use of the metal protective sleeve causes eddy current loss, relatively high temperature of the rotor and relatively low efficiency of the motor, and the like. The motor rotor of the invention comprises a plurality of fixed plates, wherein iron core plates are arranged between the adjacent two fixed plates; fixed plate shaft holes are positioned in the middle of the fixed plates respectively; iron core plate shaft holes consistent to the fixed plate shaft holes in form are arranged in the middle of the iron core plates respectively; shaft bodies are positioned in the shaft holes so as to fix all fixed plates and the iron core plates together; fastening holes are further distributed on the fixed plates and the iron core plates uniformly at peripheries of the fixed plate shaft holes and the iron core shaft holes; fixed rods are positioned in the fastening holes; more than two grooves or holes are distributed at the outer edges of the fixed plates uniformly; and the permanent magnets are positioned in the grooves or the holes of the fixed plates.

The invention discloses a magnetic valve controllable reactor, which comprises an outer insulating barrel. An upper end cover part is arranged at the upper end of the outer insulating barrel, and the lower end of the outer insulating barrel is connected with a lower end cover part. The upper end cover part comprises a high-voltage terminal of the reactor and an upper end cover, and the lower end cover part comprises a low-voltage terminal of the reactor, a pulse control line terminal and a lower end cover. A reactor main body is fixed on the inner surface of the lower end cover. A main winding of the reactor is connected with the high-voltage terminal and low-voltage terminal of the reactor respectively. An insulating bracket is arranged at the upper end of a reactor core. A thyristor component and a pulse transformer are arranged on the insulating bracket, and are connected with each other. The pulse transformer is connected with the pulse control line terminal. The invention has the advantages that: the magnetic valve controllable reactor is simple in manufacturing process, low in cost and loss, small in harmonics and wide in voltage application range, and has application potential of improving the transmission capability, regulating the voltage of a power grid, compensating reactive power and limiting over-voltage.

The invention relates to a thruster adopting water lubricated bearings, which comprises a rotor, a propeller blade, a motor stator core and a thruster casing. The propeller blade is arranged in the rotor; a waterproof winding is embedded in the motor stator core; and the rotor is connected with the thruster casing through the water lubricated bearings. The water lubricated bearings comprise an axial water lubricated bearing and a radial water lubricated bearing; the axial water lubricated bearing is arranged between an axial boss of the rotor and the thruster casing and used for the axial positioning of the rotor; and the radial water lubricated bearing is arranged between the outer diameter of the rotor and the thruster casing and used for the radial positioning of the rotor. The thruster adopts the structural mode of the integration of the propeller blade and the rotor of a motor, the waterproof motor winding and the water lubricated bearings, and can realize simplification and reliability.

The invention relates to an iron core structure of a transformer. The iron core structure comprises a group of first E-shaped sheets and second E-shaped sheets which are alternatively overlapped continuously. An outer cylinder of the first E-shaped sheet is higher than that of the second E-shaped sheet. A middle cylinder of the first E-shaped sheet is lower than that of the second E-shaped sheet. The iron core structure further comprises a compensation sheet arranged at a gap position formed by overlapping of the first E-shaped sheet and the second E-shaped sheet. The first E-shaped sheet, the second E-shaped sheet and the compensation sheet are provided with connecting holes that are connected and fastened mutually. According to the iron core structure of the transformer, the transformer is assembled rapidly and conveniently, so that the working efficiency is greatly improved, the machine enclosure resonance is reduced, the machine noise is lowered, the magnetic circuit is improved, the magnetic saturation is prevented, the electromagnetic eddy current is reduced, the eddy current consumption of the transformer is effectively reduced and the energy is saved.

The invention discloses a magnetic coupling device for downhole signal transmission, and belongs to the field of downhole transmission. The magnetic coupling device for the downhole signal transmission includes a transmitting module and a receiving module with the same structure; the transmitting module transmits downhole measurement data to the receiving module through a magnetic coupling principle in a wireless mode; the receiving module uploads the downhole measurement data to a surface system; the transmitting module includes a concave tubular body, fan-shaped long strip iron cores, interval coils and palisade type metal shells; a plurality of grooves are evenly formed in the surface of the concave tubular body, the fan-shaped long strip iron cores are fixed into each groove; the outersurface of the concave tubular body is segmentally wound with the interval coils at equal intervals; the interval coils are coated with the palisade type metal shells, a plurality of fan-shaped cut seams are evenly formed in the surfaces of the palisade type metal shells, and each fan-shaped cut seam is filled with non-metallic materials. The magnetic coupling device for the downhole signal transmission can enhance the magnetic field intensity under the same working conditions and greatly reduce the attenuation of signals, so that the downhole high performance and high quality wireless transmission is realized.

The invention discloses a continuous coil which comprises an inner conductor and an outer conductor which is wound on the outer side of the inner conductor, wherein the inner conductor and the outer conductor are mutually wound to form at least two cakes; the outer conductor in each cake is wound for a circle, and then transferred to the next cake; and the outer conductor is wound for two circles, and then transferred to the next cake. The invention also discloses a winding method of the continuous coil, which comprises the following steps: firstly, winding the inner conductor in each cake for a circle and subsequently transferring to the next cake; and then, winding the inner conductor in each cake for two circles and transferring to the next cake. Therefore, the number of coil cakes is greatly reduced so that the number of oil channels among the cakes is reduced and the utilization rate of coil space is enhanced; simultaneously, over small number of the cakes with two circles of each cake is avoided so that larger vortex loss caused by overlarge size of conductor height is avoided; load loss during operation of a transformer is reduced; and operating cost is controlled.

The present invention discloses a hybrid excitation double-stator switched reluctance motor. Six magnetism isolating blocks and six inner stator permanent magnets are embedded in a staggered mode in the circumferential direction to form a cylinder, and the left inner stator and the right inner stator which are the same in structure are arranged on the two axial end sides of the magnetism isolatingblocks and the two axial end sides of the inner stator permanent magnets respectively and are symmetrical in the axial direction. The left side inner stator and the right side inner stator are each composed of three inner stator blocks which are the same in structure and are unevenly arranged in the circumferential direction, and the left side outer stator and the right side outer stator which are the same in structure are arranged on the axial end side of the middle outer stator respectively, are symmetrical in the axial direction and are each composed of three outer stator blocks arranged in the circumferential direction. Side teeth are arranged at the end of each outer stator block in the circumferential direction, an outer stator permanent magnet is fixedly embedded between every twoadjacent side teeth, each outer stator permanent magnet is magnetized in the tangential direction of the circumference, an inner winding is wound on each inner stator salient pole tooth, and an outerwinding is wound on each outer stator salient pole tooth. Under the condition that the same exciting current flow in, the output torque is increased, and the motor power density is improved.

The invention provides a reluctance type axial flux motor rotor and a forming method, and the forming method comprises the steps: (a) coiling a punched and sheared strip-shaped silicon steel sheet to form an annular silicon steel disc which is provided with a plurality of groups of magnetic isolation grooves which are arranged at intervals along the circumferential direction, and defining a silicon steel block between two adjacent groups of magnetic isolation grooves, the number of each group of magnetic isolation grooves is two, the magnetic isolation grooves are oppositely formed in the two sides of the axial direction of the silicon steel disc, and a connecting rib for connecting every two adjacent silicon steel blocks is defined between the two magnetic isolation grooves of each group; and (d) rotor supports are clamped on the two axial sides of the silicon steel disc respectively to form a rotor disc, the rotor supports are embedded in the magnetic isolation grooves, and the axial end faces of the silicon steel blocks are exposed. The manufacturing efficiency and reliability of the silicon steel disc are improved, the consistency of the size, electromagnetism and the position of each silicon steel block on the rotor disc is ensured, and industrial batch production is further facilitated.

The invention relates to a slotless permanent-magnet machine comprising stator components. The invention is characterized in that: said stator components comprise a false stator (5); an iron core (6) and a stator winding (7). Wherein, said false stator (5) is sheathed outside the iron core (6); said stator winding (7) is arranged of wire outside the false stator (5); and said false stator (5) is made from insulation material. The invention replaces the groove and tooth on the punching sheet of stator iron core with insulated false stator (5) to effectively solve the problem of slot electric machine as slot effect, hysteresis loss, eddy current loss and eddy current loss. The invention has higher load efficiency, continuous speed regulation, better acceleration property, higher overload capacity, smaller volume, stable operation, small torque fluctuation and simple manufacture process.

The present invention discloses a watertight and antiseptic power cable and a manufacturing method thereof. The power cable comprises a cable core. The cable core is mainly composed of a plurality of strands of insulated conductors. Each strand of insulated conductor is mainly composed of a conductor and an insulating layer coated outside the conductor, wherein the insulated conductor is of a single solid-core aluminum alloy conductor structure, and a conductor water-resistant layer is coated onto the conductor. The periphery of the cable core is sequentially coated with a cable core water-resistant layer, a protective layer, an armor layer, a grapheme-asphalt layer, a water blocking isolation layer, a flame-retardant layer and a sheath layer from inside to outside. According to the technical scheme of the invention, the long-acting, stable, reliable and safe service of the power cable can be realized in a water environment and/or a humid environment. Meanwhile, the power cable is high in practicability.

The invention provides a rotor disc of an axial flux motor and a forming method, and the forming method comprises the steps: punching and shearing a strip-shaped silicon steel sheet which is provided with a plurality of block sheet parts used for rolling to form silicon steel blocks and a plurality of rib sheet parts used for rolling to form connecting ribs, at least two rib sheet parts are connected between any two adjacent sheet parts; the punched and sheared strip-shaped silicon steel sheet is rolled to form a silicon steel disc, the silicon steel disc comprises a plurality of silicon steel blocks arranged at intervals in the circumferential direction, and at least two connecting ribs are connected between any two adjacent silicon steel blocks so that the space between the two adjacent silicon steel blocks can be divided into magnetic isolation grooves formed in the two axial sides of the silicon steel disc; the plurality of accommodating holes are positioned between the two magnetic isolation grooves; the rotor supports are clamped on the two axial sides of the silicon steel disc respectively, the torque transmission rods are embedded into the containing holes, and the rotor disc is formed. The manufacturing efficiency and reliability of the silicon steel disc are improved, the consistency of the size, electromagnetism and the position of each silicon steel block on the rotor disc is ensured, and industrial batch production is further facilitated.

The invention belongs to the technical field of wireless communication, and discloses a through-the-earth magnetic field communication device. The device comprises a signal generating device and a signal receiving device, wherein the signal generating device comprises a permalloy magnetic field generator. The permalloy magnetic field generator comprises capacitors, a coil and a permalloy magneticcore. The permalloy magnetic core is a cuboid magnetic core made of an iron-nickel alloy material. The cuboid magnetic core is formed by superposing and bonding a plurality of cuboid magnetic sheets.The coil is a copper enameled wire, and the coil is wound at the central position of the permalloy magnetic core. The capacitors are connected with two ends of the coil in parallel. The signal receiving device comprises an atomic magnetometer, and the mullite magnetic field generator and the atomic magnetometer form a magnetic induction through-the-earth communication channel. Compared with a traditional ferrite magnetic core, the device has higher magnetic conductivity, and can improve the intensity of the emitted magnetic field.

The invention provides a novel direct current smelting furnace, and relates to the technical field of electric arc furnaces. The novel direct current smelting furnace includes a rectification controlcircuit, a rectification power supply device, a short net device, a multi-load layout device including multiple electrodes and an electric furnace body. The rectification power supply device includesat least two dual-circuit direct current power supply groups. Four output terminals of each dual-circuit direct current power supply group are respectively connected to three electrodes in the multi-load layout device to form two current circuits through electric furnace molten pool loads. The electrodes in the multi-load layout device are connected to same-polarity output terminals of a three-phase negative half-cycle rectification output circuit and a three-phase positive half-cycle rectification output circuit through the short net device. The rectification power supply device is provided with multiple output circuit loops. The number of output circuit loops of the rectification power supply device is the same as the number of electrodes of the multi-load layout device. The novel directcurrent smelting furnace avoids the shortcomings of mismatch between a conventional multi-electrode direct current electric furnace technology and the electric furnace molten pool loads and improvesthe practical industrial application value of smelting using direct current.

The invention discloses a permanent magnet translational-motion type meshed motor. According to the permanent magnet translational-motion type meshed motor, a permanent magnet is used as a translational-motion rotor, two windings penetrate between two rotor magnetic poles, the two windings are wound on a motor shell in the mutually-perpendicular directions, four eccentric shafts are adopted to constraint rotation motion of the rotor, the energizing time and the direction of a current are appropriately controlled so that the rotor is driven to conduct the revolution motion in a radial plane, an inner gear ring which is fixedly connected with the rotor and a dead axel outer gear are driven to be meshed with each other, and the outer gear outputs the rotation motion. According to the permanent magnet translational-motion type meshed motor, a stator of the motor is a coil which is vertically wound on the motor shell in a staggered mode, and no stator core is arranged, so that eddy current loss is reduced. The rotor is the permanent magnet, so that the power density of the motor is improved.