60 results about "Magnetic path length" patented technology

The challenge to be solved by the present invention is the miniaturization of a 1-300 W class of motor. This can be achieved by using a hollow-cylinder shaped anisotropic bonded magnet magnetized in a 4-pole configuration. The anisotropic bonded magnet has a maximum energy product approximately 4 times greater than the conventional sintered ferrite magnets. The use of a 4-pole configuration shortens the magnetic path length of the individual magnetic circuits and the magnetic force contributing to the torque is increased. When the torque is kept the same as in the conventional motor, the length of the electromagnetic rotor core and the axial magnet length can be reduced. In this fashion, 1-300 W class motors can be reduced in size.

The challenge to be solved by the present invention is the miniaturization of a 1-300 W class of motor. This can be achieved by using a hollow-cylinder shaped anisotropic bonded magnet magnetized in a 4-pole configuration. The anisotropic bonded magnet has a maximum energy product approximately 4 times greater than the conventional sintered ferrite magnets. The use of a 4-pole configuration shortens the magnetic path length of the individual magnetic circuits and the magnetic force contributing to the torque is increased. When the torque is kept the same as in the conventional motor, the length of the electromagnetic rotor core and the axial magnet length can be reduced. In this fashion, 1-300 W class motors can be reduced in size.

A device for measuring electrical current in a line may include, among other things, a Hall effect sensor wherein a first response is generated by electrical current in the line; a current transformer disposed with the line extending axially therethrough and connected in series to the Hall effect sensor wherein a second response is generated by the electrical current in the line. An equalizer may be connected to the Hall effect sensor and to the current transformer and may be configured to flatten the first and second responses relative to each other. The permeability magnetic path length and cross section of the current transformer is selected such that low frequency roll-off of the current transformer is at a lower frequency than high frequency roll-off of the Hall effect sensor.

The invention relates to an Epstein frame-based electrical sheet specific total loss measurement method, which belongs to the technical field of electromagnetic measurement. The technical scheme is as follows: three sizes of Epstein frame models are adopted to carry out the total loss measurement of the same group of measured electrical sheet samples; according to a secondary weighted average method, the effective magnetic path lengths of two groups of Epstein frames are calculated, and finally, different magnetic path lengths corresponding to different magnetic flux densities are obtained; and meanwhile, the secondary weighted average method is utilized to calculate specific total loss. The method has the advantages that: except for the measured electrical sheet samples, the material of other components is nonferromagnetic material, and therefore the affection of ferromagnetic material except for the test pieces on the measurement result is eliminated; and the method can be used for measuring the specific total loss of various brands of electrical sheets and analyzing the effective magnetic path lengths of Epstein frames and the loss of transformers and motors.

A wire-wound type chip coil can take various inductance values while maintaining its outer dimension at a specific fixed value. A chip coil is formed by winding at least two conductive wires regularly in a single layer around a core made of a magnetic material and firmly connecting both ends of each conductive wire to terminal electrodes disposed on respective flanges of the core. This makes it possible to obtain a great current capacity. Furthermore, the inductance decreases because of an increase in the magnetic path length. A great number of different inductance values can be easily obtained by properly selecting parameters including the number of substantially parallel conductive wires, the diameter of each conductive wire, and the number of turns.

The invention relates to a high-power floating high-voltage reconstructive combined type high-frequency and high-voltage rectifier transformer. The rectifier transformer comprises a combined ferrite magnetic core. The combined ferrite magnetic core is sleeved with a primary winding and a secondary winding unit set in sequence from inside to outside. An insulating layer is arranged between the primary winding and the secondary winding unit set. The outer side of the combined ferrite magnetic core is connected and fixed through a supporting frame unit. According to the rectifier transformer, the modular and reconstructive combined type design thought is adopted, the length of a magnetic path, the window area of the magnetic core, the diameter of a primary wire and a secondary wire and the number of secondary commutating windings are increased according to the needed output of the total power of the transformer, and therefore floating high voltage or positive high voltage or negative high voltage output can be achieved.

The invention discloses a vibration power generation device comprises a power generation part and a support part, wherein the power generation part comprises a top cover, an upper permanent magnet, a magnetostrictor and a lower permanent magnet which are sequentially laminated and fixed, a coil is wound around the magnetostrictor, and the support part comprises an elastic part and a base. During usage, pressure is applied to the top cover, so that the upper permanent magnet, the magnetostrictor, the coil and the lower permanent magnet downwards move together to cause change of the length of a magnetic path, the coil generates a changing magnetic field, and an induced electromotive force is generated in the coil according to a Faraday law of electromagnetic induction, namely electromagnetic power generation; and when the top cover is pressed, the base is extruded by the lower permanent magnet and is knocked, so that the magnetic path is closed, meanwhile, a generated counter-reacting force acts on the magnetostrictor, the changing magnetic field is generated in the coil according to an inverse magnetostriction effect, and the induced electromotive force is further generated, namely piezomagnetic power generation. The device is simple to design and comprises two power generation processes of electromagnetic power generation and piezomagnetic power generation, and the power generation efficiency is improved.

The invention discloses a reactor design method based on a visualization algorithm. According to the method, the reactor iron core magnetic path length l, the reactor iron core cross section S and the reactor coil turn number N are used as three variables, the value of the minimum volume V of a reactor is obtained under the limitation conditions that the inductance value L of the reactor and the volume V of the reactor meet the value of the inductance value L and simultaneously meet the coil turn number N and the iron core cross section S, and then, the reactor iron core magnetic path length l, the reactor iron core cross section S and the reactor coil turn number are obtained through combining an inductance value change trend figure and a volume change trend figure. The reactor design method has the advantages that the simplification problem is solved through the visualization algorithm, the design process is relatively visual, simple and convenient, and in addition, the function change condition can be conveniently observed.

A film thickness of second coil layers (second coil pieces) disposed below a main magnetic pole layer (first magnetic layer) is larger than a film thickness of first coil layers (first coil pieces). Hence, while a magnetic path length of magnetic flux flowing through the main magnetic pole layer (first magnetic layer) and a return path layer (second magnetic layer) is decreased by decreasing the film thickness of the first coil layers (first coil pieces) disposed in a space between the main magnetic pole layer (first magnetic layer) and the return path layer (second magnetic layer), series resistance of an entire coil layer can be decreased by increasing the film thickness of the second coil layers (second coil pieces).

The invention provides a sound production device, and relates to the technical field of electroacoustic conversion. The sound production device comprises a basin stand, a vibration system fixed in thebasin stand and a magnetic circuit system. The vibration system comprises an upper voice diaphragm fixed on the basin stand, a voice coil connected to one side of the upper voice diaphragm, and a circuit board connected to one end, far away from the upper voice diaphragm, of the voice coil; the voice coil is provided with a voice coil lead; the circuit board comprises a bonding pad electrically connected with the voice coil lead; and the vibration system further comprises a supporting piece, the supporting piece comprises a fixing part attached to the voice coil and an extending part extending from the fixing part to the circuit board in a bent mode, the extending part is fixed to the circuit board in a stacked mode and provided with receding holes corresponding to the bonding pads, at least part of the bonding pads are exposed out of the receding holes, and the voice coil lead is electrically connected with the bonding pads through the receding holes. The problem that a vibration system swings in the prior art is solved, and meanwhile the advantage that the occupied width of a circuit board is reduced, so that the length of a magnetic circuit is increased is achieved.

A magnetostrictive vibration power generation device including: a longitudinal magnetostrictive element formed of a magnetostrictive material and configured to be attached to a vibrating member at at least one end part thereof; a coil wound on a closed magnetic path constituted including the magnetostrictive element; and a permanent magnet arranged so as to apply a bias magnetic field to the closed magnetic path. A yoke member formed of a magnetic material is arranged in parallel at a side of the magnetostrictive element, and the closed magnetic path is formed including the magnetostrictive element and the yoke member, the permanent magnet is attached to the yoke member on the closed magnetic path, and the yoke member is allowed relative displacement in relation to the magnetostrictive element on at least one side in a magnetic path lengthwise direction of the closed magnetic path.

A magnetic head includes first and second magnetic layers and first and second coil pieces in a space between and outside the first and second magnetic layers, respectively. A film thickness of second coil layers (second coil pieces) disposed below a main magnetic pole layer (first magnetic layer) is larger than a film thickness of first coil layers (first coil pieces). Hence, while a magnetic path length of magnetic flux flowing through the main magnetic pole layer (first magnetic layer) and a return path layer (second magnetic layer) is decreased by decreasing the film thickness of the first coil layers (first coil pieces) disposed in a space between the main magnetic pole layer (first magnetic layer) and the return path layer (second magnetic layer), series resistance of an entire coil layer can be decreased by increasing the film thickness of the second coil layers (second coil pieces).

The invention relates to a transformer and a preparation method thereof. The transformer comprises a transformer body, electrode pins and a glue pouring layer, wherein the transformer body comprises amagnetic core and a winding coil, the winding coil is wound on the magnetic core, the electrode pins are connected with the joint of the winding coil and are attached to one side of the magnetic core, the glue pouring layer is coated on the outer side of the transformer body, covers one surfaces, attached to the magnetic core, of the electrode pins, and wraps and is cured on the outer side of theclosed magnetic circuit of the magnetic core, and the glue pouring layer is made of an epoxy glue and magnetic powder. According to the transformer, the outer side of the transformer can be coated with the glue pouring layer made of the epoxy glue and the magnetic powder so as to reduce the length of the magnetic circuit of the magnetic core of the transformer, and the number of turns of coils wound on the magnetic core is reduced under the same saturation current capacity so as to reduce the size of the transformer.

A magnetostrictive vibration power generation device including: a longitudinal magnetostrictive element formed of a magnetostrictive material and configured to be attached to a vibrating member at at least one end part thereof; a coil wound on a closed magnetic path constituted including the magnetostrictive element; and a permanent magnet arranged so as to apply a bias magnetic field to the closed magnetic path. A yoke member formed of a magnetic material is arranged in parallel at a side of the magnetostrictive element, and the closed magnetic path is formed including the magnetostrictive element and the yoke member, the permanent magnet is attached to the yoke member on the closed magnetic path, and the yoke member is allowed relative displacement in relation to the magnetostrictive element on at least one side in a magnetic path lengthwise direction of the closed magnetic path.

The invention discloses an orthogonal iron core type controllable electric reactor with a wedge-shaped groove and an equivalent magnetic path length calculating method of the orthogonal iron core type controllable electric reactor with the wedge-shaped groove under direct-current magnetic bias. The controllable electric reactor comprises a working iron core and a control iron core with the wedge-shaped groove. According to the controllable electric reactor and the equivalent magnetic path length calculating method, as the wedge-shaped groove is formed in the control iron core, the harmonic content output by the controllable electric reactor can be effectively reduced, the defect that a traditional electric reactor is high in harmonic content is overcome, and the working performance of the electric reactor is improved. Meanwhile, simulation software ANSOFT special for an electromagnetic field is adopted to calculating the alternating current equivalent magnetic path length, data of the magnetic induction intensity on a specific cross section in the orthogonal iron core type controllable electric reactor are derived and processed according to a studied algorithm, and the equivalent magnetic path length is accordingly calculated. By means of the method, errors, caused by unclear magnetization conditions of the internal iron cores, of calculation of the equivalent magnetic path length in a traditional method are reduced, the alternating current magnetization curve of the electric reactor has the higher scientificity accordingly, and guarantees are provided for studying the iron consumption and other characteristics of the orthogonal iron core type controllable electric reactor.

A wire-wound type chip coil can take various inductance values while maintaining its outer dimension at a specified fixed value. A chip coil is formed by winding at least two conductive wires regularly in a single layer around a core made of a magnetic material and firmly connecting both ends of each conductive wire to terminal electrodes disposed on respective flanges of the core. This makes it possible to obtain a great current capacity. Furthermore, the inductance decreases because of an increase in the magnetic path length. A great number of different inductance values can be easily obtained by properly selecting parameters including the number of substantially parallel conductive wires, the diameter of each conductive wire, and the number of turns.

The invention discloses a three-phase electromagnetic balancing energy-saving electric reactor. The three-phase electromagnetic balancing energy-saving electric reactor mainly consists of coils (1), core limbs (2), an upper iron yoke (3), a lower iron yoke (6) and a tightening bolt (4), wherein the coils (1) are arranged on the core limbs (2) in a sleeving mode, clamped between the upper iron yoke (3) and the lower iron yoke (6), and fixed by tightening the upper iron yoke (3) and the lower iron yoke (6) through a tightening bolt (4). During usage, the three-phase electromagnetic balancing energy-saving electric reactor is in series connected in a to-be-governed power grid of an electric power system without special operation needs and quick-wear parts, so that the application is convenient and the operation maintenance cost is low. The three-phase electromagnetic balancing energy-saving electric reactor can be manufactured into a dry-type structure and also can be manufactured into an oil-immersion structure, is simple in structure, high in practical performance, easy for large-scale production, convenient to dismount, and easy to maintain; an arrangement structure of the core limbs is in the shape of an equilateral triangle, three magnetic paths are consistent in length, shortest, and are equal in three-phase magnetic resistance; a three-phase coil is arranged on each magnetic pillar, and therefore, the magnetic resistance is relatively balanced and the loss is low. The three-phase electromagnetic balancing energy-saving electric reactor can be widely applied to balancing a three-phase power supply phase angle in electric systems of factories, authorities, residential areas and the like, increasing a system utilization rate, and lowering harms of impact and waveform distortion of large-power equipment operation to the power grid, so that purposes of saving energy and operating safely are achieved.

The invention discloses a rotor assembly and a permanent magnet motor, wherein, the rotor assembly comprises a rotor iron core provided with a shaft hole and a plurality of permanent magnet slots, alternating poles are formed between two adjacent permanent magnet slots, the rotor iron core is further provided with a first air slot distributed along the circumferential direction of the shaft hole,and the first air slot is arranged between the shaft hole and the permanent magnet slot. As such, that existence of the first air slot significantly shorten the length of the magnetic circuit of the second magnetic circuit, improves the utilization ratio of the magnetic line of force, adjusts the distribution of the magnetic lines of force on the adjacent magnetic poles, reduce the torque fluctuation, and limits the magnetic flux leakage phenomenon of the third magnetic circuit, and the existence of the first air slot greatly improves the output torque of the motor; Thus, the problem that theoutput torque of the motor decreases due to the long magnetic circuit of the magnetic field line reaching the alternating poles, the torque fluctuation is large, and the output torque of the motor decreases due to the flux leakage phenomenon of the rotating shaft of the motor is solved.

The invention provides an induction power taking device of a non-closed type magnetic core, which comprises a non-closed type drawable magnetic core coil assembly and an electric energy management module connected with the drawable magnetic core coil assembly, and is characterized in that the drawable magnetic core coil assembly comprises a plurality of thin column type magnetic cores and a magnetic core coil arranged on the outer sides of all the thin column type magnetic cores in a sleeving manner; at least a portion of the fine cylindrical core is drawable with respect to the core coil. The non-closed type magnetic core is adopted in the induction power taking device of the non-closed type magnetic core, the problem that different voltage classes of the induction power taking device are matched and compatible with the cable diameter is solved, meanwhile, a traditional whole magnetic core is equivalently replaced by several thin magnetic cores with higher effective magnetic conductivity, the magnetic cores can be drawn to change the length of a magnetic circuit in the magnetic cores, and therefore the magnetic core can be replaced by the thin magnetic cores with higher effective magnetic conductivity. And the output power and the power density of the whole magnetic core can be improved.

The invention relates to a mixed core reactor structure. The mixed core reactor structure is formed by arranging three same single-phase reactors at equal distances side by side, wherein each single-phase reactor is in a mixed core structure and comprises a core column; yokes are arranged at the upper end and the lower end of each core column; and clamping plates are arranged at the front side and the back side of each core column. By the mixed core reactor structure, a three-phase reactor is decomposed into the three single-phase reactors; the mixed core structure is adopted by each single-phase reactor; and a certain distance is kept between the cores to avoid magnetic-field interference generated among three phases, so that excellent characteristics of the mixed core reactor are ensured; magnetic circuits among the three phases are equal in length; and the three-phase imbalance degree is greatly reduced.

The invention discloses a resin-cast rectangular dry-type transformer. The transformer consists of a bracket, an iron core, a high-voltage coil and a low-voltage coil, wherein the iron core, the low-voltage coil, an insulation layer and the high-voltage coil are sequentially arranged from inside to outside; the high-voltage coil and the low-voltage coil are connected with a high-voltage terminal and a low-voltage terminal respectively; the iron core is fixed on the bracket through an upper clamping piece and a lower clamping piece; the cross section of the iron core has a rectangular structure; the high-voltage coil and the low-voltage coil are wound on a mandrel along a rectangular shape; and each winding per phase is molded by casting the resin. As the iron core, the high-voltage coil and the low-voltage coil have the rectangular structure, the transformer has the advantages of reducing the length of a magnetic path and the center distance of the transformer mandrel, decreasing the weight of a yoke by about 20 percent, saving material, reducing the no-load losses of the dry-type transformer by 10 to 15 percent, the no-load current by about 5 to 12 percent, noise and production cost and enhancing the market competitiveness.

The invention relates to a wide-frequency square-wave transformer for measurement and protection and a manufacturing method thereof. The square-wave transformer is used for measuring and protecting electrical parts and equipment and belongs to the technical field of electrical measurement and protection, comprising an iron core and a winding, wherein the iron core is of an R type iron core processed through vacuum high-temperature annealing, cooling and non-oxidation treatment; the size of the iron core is 2700-3000 square millimeters in area; the length of the magnetic path is 600-630 millimeters; and the winding comprises a first winding and a second winding. The transformer has the advantages of large variation range of working frequency value, square wave of voltage waveform, high requirement on precision, little distortion of waveform restoration, high grade of voltage withstand, high mechanical strength and good protective performance.

The invention relates to an equivalent-magnetic-circuit full-powder-core high-frequency three-dimensional reactor, and belongs to the technical field of reactors, and the problem that for an existing high-frequency reactor, a full-powder-core magnetic core cannot be achieved due to three-phase imbalance is solved. The high-frequency three-dimensional reactor comprises a magnetic core structure and coils, the magnetic core structure comprises core columns which are composed of three same cylinders and arranged in an equilateral triangle mode and magnetic cakes which are composed of two same round-corner triangles or circles and located on the upper sides and the lower sides of the core columns, the core columns and the magnetic cakes are all made of powder-core materials, and the coils are flat wires and are wound on the core columns. The lengths of magnetic paths of the three core columns are the same; each magnetic path comprises one core column and the magnetic cakes; the powder-core materials are iron powder, iron silicon powder, iron silicon aluminum powder, iron nickel powder, amorphous powder and nanocrystalline powder. According to the equivalent-magnetic-circuit full-powder-core high-frequency three-dimensional reactor, the structure is changed into the three-dimensional structure, the magnetic core is formed by splicing the core columns and the magnetic cakes which are made of the powder-core materials, and the whole frequency consumption is reduced; the flat-wire windings are adopted, the heat radiating area is increased to the maximum extent, and the temperature rise is reduced to the maximum extent.

The present invention provides a magnetic head, which performs highly efficient recording / reproducing even when a magnetic path length is shortened, and a signal wavelength is short. This magnetic head is provided with magnetic body parts and made of a pair of soft magnetic materials, in which main surfaces face a recording medium, and a magnetic gap, in which a gap between the pair of magnetic body parts in a side opposite the main surface is wider than that in the main surface, and continuously changed from the main surface side to the side opposite the main surface.

The invention relates to the field of electromagnetic devices, in particular to an intermediate transformer and a dry-type electromagnetic device using the intermediate transformer. The intermediate transformer of the invention includes an iron core, and the iron core is wound into two stepped semi-cylindrical iron cores by winding a plurality of silicon steel strips with different widths. , the two stepped semi-cylindrical iron cores are synthesized into a "Sun" shape, and then a long silicon steel sheet is used to make a seamless whole. This structure does not require punching. After insulation treatment, the magnetic permeability and magnetic circuit are greatly improved. The length is short, the leakage reactance is small, the magnetic leakage is small, the accuracy can reach above 0.2, it is not easy to saturate, the saturation times can reach more than 3 times, and the no-load current can be less than 150MA, and the iron loss is below 10W; compared with the traditional core structure, it can save 20% silicon steel sheet and steel. In addition, the iron core, the primary main winding and the secondary winding are all enclosed in a casing made of insulating material, which effectively improves the insulation performance of the intermediate transformer.

The invention provides a wireless charging magnetic positioning structure, a wireless charging module and a wireless charger. The wireless charging magnetic positioning structure comprises a first magnet and a magnetic conductive sheet; and the magnetic conductive sheet is attached to one side of the first magnet. By introducing the magnetic conductive sheet into the magnetic positioning structure and attaching the magnetic conductive sheet to the positioning magnet, magnetic lines can be focused, the magnetic path length of the magnetic lines generated by the positioning magnet can be shortened, the magnetic leakage of the positioning magnet can be reduced, and the magnetic field intensity of the magnetic positioning structure can be increased, so that accurate positioning of wireless charging coils at a transmitting end and a receiving end can be further realized, the coil coupling coefficient is effectively improved, and the charging efficiency is improved.

The invention provides a small type current clamp for the checking of a live line measurement scene, wherein one end of a current clamp body is arranged in a clamp body jacket; the other end of the current clamp body stretches out of the clamp body jacket; a clamp body embedment is arranged at an out-stretching current clamp head; a clamp body sliding chute in the same direction with a clamp body is formed in the middle part of an out-stretching end of the current clamp body; the interior of the current clamp head is provided with a measurement magnetic core component which can move left and right along the clamp body sliding chute; and a dynamic magnetic arm and a static magnetic arm of the component are closed to form a closed magnetic circuit and are opened to cause the whole closed magnetic circuit to be disconnected. With the adoption of the small type current clamp for the checking of the live line measurement scene, the problem that due to large volume, the current clamp of the prior art is inapplicable for small operation space is solved; moreover, the working position of the measurement magnetic core component extends to the current clamp head from the interior of the current clamp body; in such a way, the length of a magnetic path in the current clamp body is decreased; under the premise of guaranteeing a proportion between the cross section of the magnetic path and the magnetic path length, the measurement precision of the current clamp is guaranteed; and therefore, the small type current clamp for the checking of the live line measurement scene is applicable for the field of various live line measurements.