38results about How to "No flux leakage" patented technology

A voice coil motor of AC linear type is prepared as setting magnetism charging direction of ring magnetic steel to be radial direction and that of tile magnetic steel to be radial direction as well as that of cylindrical magnetic steel to be axial direction, arranging said ring or tile magnetic steel on base surface of iron shell along internal wall of said shell and cylindrical magnetic steel at center of iron shell bottom, arranging iron core on cylindrical magnetic steel, winding lacquered wire coil on voice coil support and erecting voice coil support in air gas between internal surface of iron shell and external surface of iron core.

The invention relates to a copper sheet embedded soft magnetic powder core inductor and a preparation method and application thereof. The copper sheet embedded soft magnetic powder core inductor comprises a copper sheet, the surface of the copper sheet is covered with a soft magnetic material, and the interface of the soft magnetic material and the copper sheet contains an insulating resin material; the copper sheet embedded soft magnetic powder core inductor has the characteristics of high density, high magnetic core permeability, high inductance value, high saturation flux density, small size and less magnetic flux leakage; and the copper sheet embedded soft magnetic powder core inductor replacing ferrite inductor with the same inductance is used in a low-voltage DC/DC converter circuit,the copper sheet embedded soft magnetic powder core inductor can obtain consistent or higher efficiency, and meanwhile, the size of the inductor can be reduced by more than half. The withstand voltage of the copper sheet embedded soft magnetic powder core inductor can reach more than 15V, and the preparation method of the copper sheet embedded soft magnetic powder core inductor is simple, high inproduction efficiency and suitable for large-scale automatic production.

The invention discloses a three-phase AC (Alternating Current) high-voltage vacuum contactor with a long service life, which can achieve 24kV voltage class and meet the requirements on one million-time mechanical life of a contactor. The three-phase AC high-voltage vacuum contactor with the long service life comprises a vacuum arc extinguish chamber arranged in an up-and-down structure, a soft connector, an insulating pull rod and a brake separating spring. A casing of the vacuum arc extinguish chamber is an integrated cylinder, the inner periphery of a shielding cylinder is provided with a convex ring of which the inner diameter is matched with the external diameter of the shielding cylinder, and the outer periphery of the shielding cylinder is connected with the inner periphery of the convex ring in a hermetic seal way; the radius of a wave trough of a corrugated tube is identical to that of a wave crest of the corrugated tube; the soft connector is formed by overlapping, tightly pressing and flattening a plurality of copper foil tapes with identical width and length; the insulating pull rod comprises a mandril of which the two ends are respectively provided with a blind hole, a connecting piece embedded in the blind holes of the mandril and an insulating sleeve sleeved outside the mandril in an attaching way, and the middle part of the outside surface of the insulating sleeve is provided with a plurality of layers of skirt rims at equal intervals; and a spring seat and a spring support seat of the brake separating spring are respectively and detachably installed on an armature and a substrate.

The invention relates to a high electromagnetic pulse prevention flexible aluminum alloy cable. The cable comprises a cable conductor, wherein the cable conductor is formed through twisting multiple strands of alloy wires, an outer side of the cable conductor is extruded by a foaming thermoplastic elastomer insulation layer, an outer side of the foaming thermoplastic elastomer insulation layer is wrapped into a semi-conduction strap wrapping shielding layer, the foaming thermoplastic elastomer insulation layer and drainage wires are twisted, the foaming thermoplastic elastomer insulation layer and an outer side of the drainage wires are longitudinally covered by a conductive strap, an inner surface of the conductive strap is connected with multiple strands of drainage wires, an outer side of the conductive strap is provided with a nickel-clad copper wire woven shield layer, an outer side of the nickel-clad copper wire woven shield layer is extruded by a foaming thermoplastic elastomer sheath, and an outer side of the foaming thermoplastic elastomer sheath is extruded by a stainless band linkage armor layer. The cable is advantaged in that low manufacturing cost, excellent performance, good electromagnetic pulse prevention effect, simple manufacturing process, novel design, strong practicality, good stability, high reliability, convenient use and easy popularization and application are realized.

The invention provides a fluxgate digital current sensor based on a pulse amplitude detection method. The fluxgate digital current sensor comprises a probe unit, an excitation unit, a signal processing unit, an MCU main control unit and an output unit, wherein the excitation unit is connected with the probe unit, the excitation unit generates a sine wave signal, sine excitation current with the angular frequency of omega is applied to an excitation coil of the probe unit, and an excitation magnetic field He is generated; the probe unit is connected through the signal processing unit and is used for converting Ip measurement to be measured into excitation current Iex; the signal processing unit is connected with the main control unit and converts the excitation current Iex into voltage measurement Uex through a sampling resistor Rs and an operational amplifier; the main control unit MCU mainly completes the frequency control, detection and data processing functions of the excitation unit, and calculates the current Ip to be measured according to the sampled voltage Uex; the output unit is a CAN bus interface, is connected with the main control unit, and provides a communication interface for a sensor and other main control equipment.

The invention discloses a heat-curable magnetic epoxy resin powder coating and an inductor packaging method thereof. The heat-curable magnetic epoxy resin powder coating is characterized by containing the following substances in percentage by weight: 30 to 50 percent of epoxy resin, 20 to 50 percent of soft magnetic ferrite powder, 10 to 20 percent of a composite curing agent, 5 to 8 percent of a filler and 3 to 8 percent of an assistant. The method comprises the following steps: proportionally mixing the epoxy resin, the soft magnetic ferrite powder, the composite curing agent, the filler and the assistant, performing uniform stirring by virtue of stirring equipment, preparing a flaky dry material, crushing the flaky dry material, impregnating a preheated inductor in obtained powder by virtue of fluidized coating equipment, and performing baking, cooling and packaging. The heat-curable magnetic epoxy resin powder coating and the inductor packaging method thereof have the advantages that the powder has high flowability under the driving of airflow, so that packaging is facilitated without adhesion; the material cost is reduced, and the prepared coating can be easily stored for long; the production efficiency can be improved, the coating can be kept uniform, and the product is stable in inductance and small in error change; the inductance can be increased, the coating can be endowed with an electromagnetic shielding function, and flux leakage is avoided; the saturation resistance of current is improved; the heat-curable magnetic epoxy resin powder coating and the inductor packaging method thereof are applied to improvement of packaging of a vertical plug-in inductor and a packaging material.

The invention discloses a cylinder-typed permanent magnetic system, which is composed of axial direction leveling and periodical inner ring-shaped permanent array and outer ring-shaped permanent array at the same shaft. The sine waveshape periodical magnetic field is formed on random axial cross section of ring-shaped gap between inner and outer ring-shaped permanent magnetic arrays, which is composed of several equal radial thickness neodymium ferroboron magnetic ring axial gapless periodical superpositions, whose geometrical structure and magnetic direction possess axial symmetry and periodicity. The invention reduces gap magnetic resistance and axial component of gap magnetic density, which improves spatial distribution pattern of gap magnetic density and utility rate.

The invention provides a switching mode power supply. In the power supply, two input ends of a bridge rectifier (Z) are connected with an alternating current power supply; the positive input end of the bridge rectifier (Z) is connected with an unidirection silicon controlled rectifier (SCR); a cathode of the unidirection silicon controlled rectifier (SCR) is the positive output end (V+) of a power supply; the negative output end of the bridge rectifier (Z) is the negative output end (V-) of the power supply; a filter capacitor (C) is connected in parallel between the positive output end (V+) and the negative output end (V-) of the power supply; a control electrode of the unidirection silicon controlled rectifier (SCR) is connected with the negative end of a voltage-regulator tube (DW); the positive end of the voltage-regulator tube (DW) is connected with the negative output end (V-) of the power supply; and a current limit resistor (R) is connected between the positive output end of the bridge rectifier (Z) and the negative end of the voltage-regulator tube (DW). The power supply has the advantages of low cost, high efficiency, small volume, convenient production and debugging, wide input voltage range and no high-frequency high-voltage pulse radiation, and is particularly applicable to driving power supply of various semiconductor lamps.

The invention discloses an induced metamagnetic generating method. At least one iron core and at least one magnet set are used, wherein each iron core is provided with a coil, each magnet set consists of two magnets, and heteropoles of the two magnets in the same set are opposite. The magnetic flux in the iron cores is changed by utilizing relative motions of the iron cores and the magnets, specifically, the magnetic flux in the iron cores is increased to a maximum value from zero and then gradually reduced to zero from the maximum value, and the process is repeatedly circulated so as to ensure that the coils on the iron cores generate induced current. Induced electromotive force is generated through changing the magnetic flux in the iron cores but not cutting magnetic force lines by the coils, the magnetic force lines are vertical to the coils on the iron cores all the time, and the relative rotating direction of the iron cores and the magnets is also vertical to the magnetic force lines, thus a rotating magnetic field generated by the induced current in the coils cannot generate obstructing actions on the relative rotations of the iron cores and the magnets so as to save energy consumption required by generating.

The invention belongs to the field of underwater detection and specifically relates to a bionic robotic fish. The bionic robotic fish comprises a shell, an upper fish fin, a lower fish fin, a fish tail, a copper shell, a sealing cover, three magnetic control structures, three electric control structures and a wireless electric remote controller, wherein the upper fish fin is fixedly arranged at the top of the shell; the lower fish fin is fixedly arranged at the bottom of the shell; the fish tail is fixedly arranged at the tail of the shell; the copper shell is arranged in the shell; an external thread is arranged on a side wall at one end of the copper shell; an internal thread which is matched with the external thread of the copper shell is arranged on the inner side of the sealing cover; the sealing cover is connected with the copper shell through the thread; the magnetic control structures are respectively arranged in the upper fish fin, the lower fish fin and the fish tail and are used for driving the upper fish fin, the lower fish fin and the fish tail to move so as to drive the bionic robotic fish to move; the electric control structures are fixedly arranged in the copper shell; the mounting positions of the electric control structures are respectively matched with the positions of the upper fish fin, the lower fish fin and the fish tail; the electric control structures are used for driving the magnetic control structures; the wireless electric remote controller is communicated with the electric control structures and is used for remotely controlling the underwater motion direction and speed of the bionic robotic fish.

The invention provides a manual speed-adjustment permanent-magnet coupler, and the coupler comprises a permanent-magnet coupler. The permanent-magnet coupler comprises a power part and a transmission part. The power part comprises a motor and a conductor column connected with a motor shaft. The transmission part comprises a transmission shaft, a magnet cylinder connected with the transmission shaft, and at least two permanent magnets disposed at an inner side of the magnet cylinder. There are gaps between the conductor column and the permanent magnets, and the distances, between adjacent permanent magnets, along the periphery of the magnet cylinder are equal. The coupler also comprises a speed-adjustment device which is disposed at the transmission part of the permanent-magnet coupler. The speed-adjustment device comprises a seat body, a supporting part in fixed connection with the transmission part, and a cylindrical adjustment rack which is fixedly connected with the supporting part through a fixed rod and disposed in a fixed groove on the seat body. A hand-operated handle is disposed at a side of the fixed groove, and is in adaptive connection with a cylindrical straight tooth part of the cylindrical adjustment rack. Through the design, the coupler can achieve the indirect adjustment of the rotating speed of the transmission part through the manual adjustment of the hand-operated handle, and is practical.

The invention relates to an instrument step motor with a large rotor and low speed ratio. A core of an instrument comprises a stator, stator coils and a magnet rotor. The stator is made of a soft magnetic material and is divided into three pieces, one end face of each piece is used as a magnetic pole face, and the three pieces are distributed on the circumference at equal intervals by 120 DEG, wherein the other end of the first stator piece and the other end of the second stator piece respectively pass through the two stator coils to be overlapped with the third stator piece, i.e. the other end of the third stator piece is overlapped on the parts of the first stator piece and the second stator piece, stretching out of the stator coils, by being separated in 180 DEG. In order to solve the problem that three magnetic poles are not on the same plane because of overlapping, a folding mark of the third stator piece is processed in the overlapping position, and thus, the magnetic poles of the three stator pieces can be ensured to be on the same plane. The magnet rotor with 5-8 mm in diameter is assembled in the circumference and provided with four pairs of magnetic poles along the radial direction.

The invention discloses an equally-divided combined amorphous stator core and a manufacturing method. The invention discloses an equally-divided combined stator core. The amorphous alloy transformer comprises a plurality of amorphous iron core modules and silicon steel iron core modules which are arranged at intervals, wherein the two ends of the amorphous iron core are both silicon steel iron core modules; and each amorphous iron core module is formed by laminating a plurality of layers of annular amorphous iron core pieces; each amorphous iron core piece is equally divided into N amorphous iron core bodies; the N amorphous iron core bodies are connected with one another to form the annular amorphous iron core pieces; and joints of the adjacent layers of amorphous iron core pieces are laminated in a staggered manner. According to the invention, the mode of equally dividing the whole-circle amorphous and nanocrystalline stator iron cores and then combining the stator iron cores is adopted; the utilization rate of amorphous and nanocrystalline materials is greatly improved through pattern typesetting and cutting; and the material consumption of unit stator iron cores is reduced; considering the strength problem of the combined full-circle iron core, the technical scheme adopts the technical scheme that adjacent layers of joints are stacked in a staggered manner during axial lamination, and a plurality of layers of full-circle silicon steel chips are added after the amorphous stator iron core is stacked for a certain thickness, so that the overall strength of the iron core isenhanced, and the performance stability of the iron core is guaranteed.

The invention discloses a device for automatically identifying the number of a wind tunnel nozzle. The device comprises a magnet base, magnets, a Hall switch base and Hall switches. The Hall switch base is installed on the side wall butt joint with a flange of a wind tunnel prechamber. The four Hall switches are installed on the Hall switch base and are connected to a wind tunnel measurement and control system through leads. The side wall butt joint with a flange of a wind tunnel is provided with the magnet seat, the magnet seat is internally provided with four magnet holes, and the magnets are located in the magnet holes. The wind tunnel measurement and control system determines the nozzle state and then automatically adjusts the state parameter setting of the wind tunnel testing, so that the wind tunnel testing efficiency is greatly improved, and the Hall switches are non-contact switching elements and are featured by being not easy to damage, simple in structure, convenient to install, and low in use and maintenance cost.

The invention provides a magnetic focusing sensor with variable turns and a rotating speed and torque calculation method, and belongs to the technical field of sensors. The problems that an existing sensor cannot measure the rotating speed and the torque at the same time and is complex in structure are solved. A magnetic focusing sensor with variable turns comprises a to-be-measured shaft and acquisition mechanisms, two ends of the to-be-measured shaft are respectively a shaft input end and a shaft output end, the acquisition mechanisms are respectively arranged at the shaft input end and the shaft output end, each acquisition mechanism comprises a fixing ring, a permanent magnet, a receiving coil and a housing, an inner ring of the fixing ring is connected with the to-be-measured shaft, and an outer ring of the fixing ring is connected with the to-be-measured shaft. The outer ring is connected with a plurality of permanent magnets, the plurality of permanent magnets are uniformly distributed along the circumferential direction of the fixed ring, each permanent magnet is of a conical structure, the receiving coil comprises a plurality of rectangular coils, and the plurality of rectangular coils are sequentially bent and arranged in a surrounding manner to form a circumferential shape. The rotating speed and torque calculation method is mainly used for measuring and calculating the rotating speed and the torque of the shaft.