27 results about "Flux loop" patented technology

A viscous clutch assembly includes a rotationally fixed center shaft, a rotor rotatably supported on the center shaft, a housing rotatably supported on the center shaft, a working chamber, a reservoir carried by the rotor, an electromagnetic coil located at or near a front end of the center shaft, a valve subassembly magnetically operable to control flow of a shear fluid between the reservoir and the working chamber, a flux guide extending axially across a cover of the housing, and a magnetic flux insulating material positioned adjacent to and radially inward from the flux guide. A flux circuit located forward of the rotor connects the electromagnetic coil and the valve subassembly and passes through the flux guide and the center shaft, with the magnetic flux insulating material at least partially surrounded by the flux circuit.

The utility model relates to the technical field of boiler maintenance, and discloses a boiler pipeline detection device which comprises a support, a detection mechanism and a flaw detection mechanism, the support comprises a connecting rod and a mounting seat, the detection mechanism comprises an ultrasonic probe, and the ultrasonic probe detects the wall thickness of a pipeline; the flaw detection mechanism comprises a flaw detection driving part, a flaw detection platform and a magnetic circuit assembly; the flaw detection driving part drives the flaw detection platform to get close to or away from the mounting seat; the magnetic circuit assembly comprises a first permanent magnet, a second permanent magnet and a magnetic flux leakage probe, and the first permanent magnet, the magnetic flux leakage probe and the second permanent magnet are sequentially arranged on the flaw detection platform. According to the technical scheme, the ultrasonic probe measures the wall thickness of the pipeline and judges whether the pipe wall is damaged or not; if the damage flaw detection platform is close to the pipeline, the first permanent magnet and the second permanent magnet form a magnetic flux loop to penetrate through the pipe wall; the damage of the pipe wall is detected by the magnetic flux leakage probe to obtain a magnetic flux leakage signal; the damage type is analyzed according to the magnetic flux leakage signal, maintenance is performed according to the damage type, and the pipeline maintenance time is shortened.

The invention relates to a current-doubling rectification magnetic integrated transformer. Comprising a magnetic core assembly, a primary winding and a secondary winding, the magnetic core assembly comprises a middle column and two side columns; the primary winding and the secondary winding are respectively wound on the side columns to form a closed magnetic flux loop; the middle column is made of a composite magnetic conductive material; the saturation flux density of the composite magnetic conductive material is greater than 0.5 T; the initial value of the relative permeability of the composite magnetic conductive material is relatively low and is reduced along with the increase of the load current. According to the invention, the problem that it is difficult to balance anti-saturation, filtering and quick response in a full-load range in the prior art is solved; anti-saturation, filtering and quick response in a full-load range are balanced; moreover, the composite magnetic conductive material replaces a centralized air gap, thereby facilitating the reduction of scattered magnetic flux, and further facilitating the reduction of the eddy current loss of the winding.

The invention discloses an integrated adjustable leakage inductance matrix transformer and a resonant converter, and relates to the technical field of power electronics, the matrix transformer comprises an upper cover plate, a middle cover plate, a lower cover plate, a plurality of magnetic columns, a primary winding and a secondary winding; the magnetic columns are arranged between the upper-layer cover plate and the lower-layer cover plate, and each magnetic column is provided with an air gap; the middle-layer cover plate is arranged between the upper-layer cover plate and the lower-layer cover plate and penetrates through the air gaps; the primary winding is wound on the magnetic column close to one side of the upper-layer cover plate, and the secondary winding is wound on the magnetic column close to one side of the lower-layer cover plate; after electrification, a magnetic field generated by primary side current excitation forms a main magnetic flux loop through the upper-layer cover plate, the magnetic column, the lower-layer cover plate, the magnetic column and the upper-layer cover plate, and forms a leakage magnetic flux loop through the upper-layer cover plate, the magnetic column, the middle-layer cover plate, the magnetic column and the upper-layer cover plate; the size of the leakage inductance of the leakage magnetic flux loop is adjusted by adjusting the structural parameters and design conditions of the middle-layer cover plate. According to the invention, accurate control of the leakage inductance of the transformer and integration of the resonant inductor and the transformer are realized.

The invention discloses a high-initial-thrust electromagnetic actuating device with a multi-magnetic-field mixing effect, and belongs to the technical field of aerospace. The problem that a spacecraft cannot be separated at a preset speed due to the fact that an existing electromagnetic actuator is small in initial thrust is solved. The stator comprises an outer magnetic structure, an inner magnetic structure, an upper magnetic structure, a lower magnetic structure and a stator coil structure, and the lower magnetic structure comprises a lower magnetic yoke, a lower inner axial magnetic ring and a lower outer axial magnetic ring, the inner magnetic structure comprises an inner magnet yoke, an inner upper radial magnet ring, an inner middle axial magnet ring and an inner lower radial magnet ring, wherein the inner upper radial magnet ring, the inner middle axial magnet ring and the inner lower radial magnet ring are coaxial and sequentially sleeved outside the inner magnet yoke from top to bottom. The magnetic flux loop formed by the two radial magnetizing permanent magnet rings with small heights is utilized to increase the air gap magnetic field intensity of the part, close to the stator coil, between the two radial permanent magnet rings with large heights, so that the Ampere force borne by the rotor coil is increased, and the initial thrust is increased.

The application discloses a kind of power wave transceiver of short-distance wireless power supply of rotating shaft body and transmission method, it is related to short-distance wireless power wave power supply technical field.For the defects that the service life is short, reliability is low, is susceptible to temperature and humidity, salt fog, vibration impact in harsh environment under traditional rotating shaft body carrying battery power supply mode, the device is composed of wireless power wave transmitting circuit, receiving circuit and wireless magnetic coupling circuit, transmitting circuit generates medium-high frequency electromagnetic field without electromagnetic pollution through medium-high frequency converter and resonance circuit, receiving circuit rotates synchronously with rotating shaft body, realizes magnetic energy wireless transmission through closed magnetic flux loop, and power supply for load on shaft body after rectification and voltage stabilization.

The embodiment of the invention provides a Hall current sensor for on-chip current measurement and a manufacturing method thereof, and belongs to the technical field of semiconductor magnetic sensing. The Hall current sensor comprises two Hall units which are arranged on the two sides of the upper surface of the current row in pairs in an attached mode, and each Hall unit is at least one Hall array; two ends of the first magnetic gathering part are respectively arranged on the upper magnetic induction surfaces of the two Hall units; the second magnetism gathering part has a concave cross section to wrap the current bar, and two ends of the second magnetism gathering part are respectively arranged on the lower magnetic induction surfaces of the two Hall units; the overlapped parts of the projections of the first magnetism gathering part and the second magnetism gathering part on the corresponding magnetic induction surfaces are positioned in Hall sensitive areas of the two Hall units; a current magnetic field is subjected to magnetism gathering through the first magnetism gathering part and the second magnetism gathering part to form a magnetic flux loop penetrating through the Hall sensitive area, so that the Hall unit senses the magnetic field and converts the magnetic field into a signal through a circuit to be output. The Hall current sensor efficiently concentrates a current magnetic field to avoid the influence of a skin effect on current measurement.

A disruptive improvement in reactors is disclosed. The operating principal of this invention is to create an abrupt change, in the stored potential energy, Wm, in magnetic flux (77), via at least one localized increase (87) and at least one localized decrease (82), of the magnetic field intensity, within the boundaries of a flux loop. Since current flow through a reactor can not change abruptly, a paradox is created. To counteract mentioned paradox, at least some magnetic flux (77a) components, may be forced to jump a non- magnetic-section (88), dependent on the power level, of the frequency, components in mentioned flux. The disclosed arrangement may cause a non-linear response, resulting in advantages over a prior art reactor, (with a linear response); including: reduce reactance, reduced apparent power and increased true power factor, at the fundamental power frequency, f(fundamental). A new circuit symbol (70), for the invention, is suggested.

The application discloses a large initial thrust electromagnetic actuator with multi-magnetic field mixing effect and belongs to the technical field of aerospace. The application solves the problem that the existing electromagnetic actuator has small initial thrust and causes the spacecraft to be unable to separate at a predetermined speed. The stator comprises an outer magnetic structure, an inner magnetic structure, an upper magnetic structure, a lower magnetic structure and a stator coil structure, the lower magnetic structure comprises a lower magnetic yoke and a lower inner axial magnetic ring and a lower outer axial magnetic ring which are installed at the top end of the lower magnetic yoke, and the inner magnetic structure comprises an inner magnetic yoke and an inner upper radial magnetic ring, an inner middle axial magnetic ring and an inner lower radial magnetic ring which are coaxial and are sequentially sleeved on the outside of the inner magnetic yoke from top to bottom. The magnetic flux loop formed by two small-height radial magnetizing permanent magnetic rings is utilized to increase the air gap magnetic field intensity of the part close to the stator coil between the two high-height radial permanent magnetic rings, so that the ampere force borne by the mover coil is increased, and the initial thrust is increased.

The embodiment of the application provides a Hall current sensor for on-chip current measurement and a manufacturing method thereof, and belongs to the technical field of semiconductor magnetic sensing. The Hall current sensor comprises two Hall units arranged in pairs and attached to the two sides of the surface above a current row, each Hall unit being at least one group of Hall arrays; a first magnetic concentrating part is arranged on the upper magnetic induction surface of the two Hall units; a second magnetic concentrating part has a concave cross section and wraps the current row, and the two ends of the second magnetic concentrating part are arranged on the lower magnetic induction surfaces of the two Hall units; the overlapping part of the projection of the first magnetic concentrating part and the second magnetic concentrating part on the corresponding magnetic induction surface is located in the Hall sensitive area of the two Hall units; the current magnetic field is concentrated by the first magnetic concentrating part and the second magnetic concentrating part to form a magnetic flux loop passing through the Hall sensitive area, so that the Hall unit senses the magnetic field and converts the magnetic field into a signal output through a circuit. The Hall current sensor of the application can efficiently concentrate the current magnetic field and avoid the influence of the skin effect on the current measurement.

A viscous clutch assembly includes a rotationally fixed center shaft, a rotor rotatably supported on the center shaft, a housing rotatably supported on the center shaft, a working chamber, a reservoir carried by the rotor, an electromagnetic coil located at or near a front end of the center shaft, a valve subassembly magnetically operable to control flow of a shear fluid between the reservoir and the working chamber, a flux guide extending axially across a cover of the housing, and a magnetic flux insulating material positioned adjacent to and radially inward from the flux guide. A flux circuit located forward of the rotor connects the electromagnetic coil and the valve subassembly and passes through the flux guide and the center shaft, with the magnetic flux insulating material at least partially surrounded by the flux circuit.

The application discloses a tripping assembly, wherein a permanent magnet assembly is arranged in a U-shaped cavity of a magnetic yoke, the overall volume of the tripping assembly is reduced, the permanent magnet and a magnetic conducting sheet are respectively connected to a horizontal arm and a second vertical arm of the magnetic yoke, the magnetic resistance of the permanent magnet magnetic circuit is minimized and stabilized, meanwhile, the magnetic flux generated by the permanent magnet is divided into two magnetic flux branches with different sizes, and the magnetic flux branch with smaller magnetic flux is used to provide magnetic force for an armature, the tripping assembly has stable magnetic flux and long service life, and can meet the working conditions of small current and low power consumption. The application further discloses an electromagnetic tripping device provided with the tripping assembly, and an electrical protection device provided with the electromagnetic tripping device.

The present invention relates to a ferromagnetic flip armature (100) for a vehicle solenoid valve, wherein the flip armature is configured to move the flip armature into one of two positions by establishing a magnetic field, so that a magnetic flux associated with the magnetic field and passing through the flip armature is guided through a gap (250) in this position via at least one surface of the flip armature to form a closed magnetic flux circuit (70), wherein the flip armature can be flipped between the two positions about a rotation axis (20) fixed relative to the vehicle solenoid valve, wherein at least one surface of the flip armature is enlarged by an edge upset (110) of the flip armature and is configured to reduce the magnetic resistance caused by the gap.

Example embodiments provide a voice coil apparatus that may comprise corner posts, a voice coil wound directly on to the corner posts, the coil forming straight sides between the corner posts due to winding tension, and a center flux return having straight sides and having a continuous plated layer of electrically conductive material, the center flux return being made of a ferromagnetic material. The voice coil apparatus may further comprise rubber mounts at corners of the center flux return and supporting the corner posts, and configured to provide high lateral compression stiffness and low axial shear stiffness in order to facilitate axial movement of the voice coil. In example embodiments, the voice coil lacks a coil former. The rubber mounts and the corner posts establish a uniform offset. The continuous plated layer serves as a shorted turn.

An electric motor includes: a rotor configured to rotate about an axis and a stator radially spaced from the rotor. The stator includes a plurality of stator phases arranged along the axis, each stator phase including a pair of flux loops and a coil extending about the axis and disposed between the pair of flux loops. Each flux loop includes a plurality of teeth. These teeth are configured to route magnetic flux. The laminations in the stator and rotor may have different lamination densities to achieve magnetic flux routing. The air gap between the rotor and stator may be a variable distance.

According to the active variable-stiffness micro-displacement actuator based on magnetostrictive driving and the method, magnetostrictive materials are used as actuating elements, and dynamic adjustment of structural stiffness is achieved based on the delta E effect of the magnetostrictive materials. Comprising a magnetostrictive driving unit, a permanent magnet, an exciting coil, a framework and a rhombic pre-pressing mechanism. Wherein the permanent magnets at the two ends of the magnetostriction driving unit provide a bias magnetic field, and the excitation coil provides an alternating magnetic field. The strength and frequency of the alternating magnetic field are controlled by changing the current in the coil, the material elasticity modulus of the magnetostriction driving unit is adjusted, and dynamic adjustment of the structural rigidity of the actuator is achieved. The diamond-shaped pre-pressing mechanism provides pre-pressing force for the magnetostrictive material, and meanwhile magnetic flux loops of the magnetostrictive driving unit and the permanent magnet can be closed. The active variable-stiffness elastic micro-displacement actuator has the advantages of being compact in structure, small in size, high in frequency response block, low in driving voltage, easy to install and the like. The method is suitable for the fields of aerospace, ultra-precision driving, structural vibration control and the like.

The application discloses a valve sleeve outdoor arrangement of a +500kV flexible direct current converter transformer, which comprises an oil tank, an on-load tap changer and a cooler, has a single-phase double-winding structure, and is provided with coils sleeved on first and second middle core columns, and two outer side core columns only serve as a magnetic flux loop; valve side coils and network side coils on the two core columns are connected in parallel respectively; the arrangement order of the coils on each core column is as follows: starting from the side of the core, a voltage regulating coil, a network side coil and a valve side coil; the coils on the first core column are all left-wound, and the coils on the second core column are all right-wound. The application is the first flexible direct current product with the largest capacity and the highest voltage grade in China, has high overall insulation level, and the overall structure satisfies the mechanical strength and short-circuit resistance of the product, reduces the design and operation difficulty of the main insulation structure, improves the safety and reliability of the product, can realize a major technical breakthrough of the ultra-high voltage flexible direct current converter transformer, and fills the domestic blank.

The invention provides a three-column winding structure and a single-phase three-column magnetically controlled reactor, belongs to the technical field of magnetically controlled reactors, adopts a three-column iron core structure, and comprises a central column and two symmetrically distributed side columns. The core technology innovation lies in that the central column is formed by alternately overlapping double-phase composite magnetic material sheet layers and silicon steel sheet layers, the double-phase composite magnetic material is composed of a soft magnetic phase and a hard magnetic phase, the soft magnetic phase provides high magnetic conductivity to support main magnetic flux transmission, and the hard magnetic phase provides high coercive force to maintain residual magnetism stability. The central column is provided with different soft and hard magnetic phase volume ratio distribution in the axial direction, and gradient magnetic performance optimization is achieved. The control winding is formed by winding a flat copper wire, the working winding adopts a circular copper wire, and the air gap structure and the magnetic circuit connecting part which are accurately designed are matched to form a complete magnetic flux loop, so that the technical problem of large eddy current loss of the traditional magnetically controlled reactor is solved.

The embodiment of the invention provides a magnetic element and power equipment. The magnetic element comprises a magnetic core shell, a middle column and a winding part; the winding component and the middle column are both contained in an inner cavity of the magnetic core shell, the winding component is wound on the outer surface of the middle column, and the two ends of the middle column are both connected with the inner wall of the magnetic core shell. The magnetic material of at least a portion of the magnetic core housing is different from the magnetic material of the center pillar. Due to the fact that the winding component and the middle column are both contained in the inner cavity of the magnetic core shell, namely, the winding component and the middle column are contained in the magnetic core shell, the middle column and the magnetic core shell can form a carrier of a closed magnetic flux loop, magnetic flux of the winding component can be restrained in the magnetic core shell, leakage magnetic flux is reduced, and therefore the inductance value of the magnetic element can be increased.

The application discloses a kind of orthogonal flux magnetic core structures for improving Sigma converter power density, comprising: multiple magnetic legs, multiple PCB boards nested on the magnetic leg, the winding of Buck inductance, the first primary winding and the second primary winding of LLC transformer;First primary winding and second primary winding are respectively arranged in first PCB board and third PCB board, and the winding of Buck inductance is arranged in second PCB board;The leakage inductance of LLC transformer is used to replace the resonant inductance of LLC transformer, the magnetic flux loop generated by first primary winding and second primary winding is the same, and the magnetic flux loop generated by the winding of Buck inductance is orthogonal.This application integrates three magnetic elements using a magnetic core structure, reduces the volume occupied by magnetic elements, and is beneficial to improve Sigma converter power density.In addition, it also makes the coupling coefficient of first primary winding, second primary winding and the winding of Buck inductance all 0.

The present invention relates to a magnetorheological rubber-foam metal bearing with controllable hydrophilicity and hydrophobicity. The magnetorheological rubber-foam metal sleeve is evenly divided into n arc-shaped cross-sectional units along the circumferential direction. i water film sensors are provided inside each arc-sectional unit along the axial direction of the magnetorheological rubber-foam metal sleeve, and two copper electrodes are led out of each water film sensor at both ends. j electromagnetic coils are provided outside each arc-sectional unit along the axial direction of the magnetorheological rubber-foam metal sleeve, and the two poles of the electromagnetic coils are fixed to the periphery of the magnetorheological rubber-foam metal sleeve. The gaps between adjacent electromagnetic coils and the bearing housing are filled with iron blocks, and the iron blocks and the electromagnetic coils form a magnetic flux loop. The invention solves the problem that conventional rubber bearings have insufficient bearing capacity of water-lubricated rubber bearings, unadjustable hydrophilicity and hydrophobicity of the lubrication interface, insufficient noise reduction and wear resistance, and other problems that restrict the performance improvement of rubber sliding bearings due to the unadjustable sleeve material properties and interface lubrication state.

The invention relates to a novel micro motor with a yoke-free stator. The technical problem that a stator of an existing traditional micro motor has defects and the like is solved. Comprising a motor shell and a controller shell arranged at one end of the motor shell, a motor shaft with a motor rotor on the outer side is rotationally arranged in the motor shell in a penetrating mode, a yoke-free stator located on the outer side of the motor rotor in the circumferential direction is arranged on the inner side of the motor shell, and a plurality of stator tooth parts are arranged on the outer side of the yoke-free stator in the circumferential direction. Tooth grooves are formed in the stator tooth parts, a stator groove is formed between every two adjacent stator tooth parts, and a through groove structure communicated with the inner side of the yoke-free stator is arranged at the bottom of each stator groove. The invention has the advantages that: a yoke part required by a magnetic flux loop in a traditional stator is thoroughly removed by utilizing the design of the yoke-free stator, eddy current and magnetic hysteresis loss are radically reduced, the efficiency is particularly obviously improved at a high rotating speed, the temperature rise of the motor is lower, and the motor is lighter and smaller and realizes extremely high power density under the condition of outputting the same power.

The utility model discloses an ultrasonic wireless electric energy transmission device which comprises a wireless transmitting module and a wireless receiving module. The wireless receiving module comprises a secondary side support, a secondary side magnetic core and a secondary side coil, the secondary side support is of an annular cylinder structure, and the secondary side magnetic core and the secondary side coil are fixed to the outer wall of the secondary side support in a sleeving mode; the wireless transmitting module comprises a primary side support, a primary side magnetic core and a primary side coil, the primary side support and the primary side magnetic core are of a fan-shaped structure, the primary side magnetic core is fixedly connected into the primary side support, the section of the primary side magnetic core is of a first C-shaped structure, at least one side of the first C-shaped structure is inclined to the axis of the secondary side support, and the primary side coil is wound on the primary side magnetic core; an air gap is arranged between the wireless transmitting module and the wireless receiving module, and a magnetic flux loop is formed between the secondary side magnetic core and the primary side magnetic core. The ultrasonic wireless electric energy transmission device disclosed by the utility model can improve the application of a wireless transmission system in a complex environment and the stability of high-power transmission.

The invention discloses a modular double-iron-core rectifier transformer based on harmonic magnetic circuit decoupling. The modular double-iron-core rectifier transformer comprises two iron cores with independent magnetic circuits, the two groups of three-phase high-voltage windings are respectively wound on the iron core, have the same electrical parameters and are connected in series to form a high-voltage network; the two groups of low-voltage windings are respectively arranged corresponding to the iron cores; the low-voltage windings are configured in a mixed mode according to a preset connection mode and used for providing a zero-sequence impedance access in the rectification process. The system realizes harmonic suppression through the following mechanisms: a high-zero-sequence impedance network formed in a hybrid connection mode is used for suppressing 3k-order harmonic current; harmonic circulation with opposite phases is generated in a high-voltage winding through a magnetic flux path with separated double iron cores, and fifth and seventh harmonics are counteracted; and each harmonic magnetic flux is limited in a closed magnetic flux loop in the respective iron core, so that equivalent high harmonic impedance is formed, and harmonic magnetic field propagation is limited.

The application discloses a kind of electric power high-voltage busbar current temperature composite sensors, component one and component two;Second magnet is equipped in component two;First magnet and sensor system are equipped in component one, and coil is equipped on first magnet;Component one and component two are connected in a detachable manner to form annular of different lengths, so that first magnet and second magnet form closed magnetic flux loop, and annular is used to clamp the busbar to be measured;Self-locking will be carried out after component one is connected with component two.By component one and component two are connected in a detachable manner to form annular of different lengths, effective monitoring means can be provided for high-voltage busbar current monitoring and busbar temperature monitoring of installed position.Meanwhile, the composite sensor proposed in the application realizes power taking through induced current by transformer busbar through self-power-taking technology, has small volume, is convenient to install and saves cost, and can overcome the shortcomings of traditional equipment monitoring.

The application discloses a Maxwell electromagnetic two-axis positioning platform device and a working method thereof. The device comprises a moving platform, a guide mechanism and a driving mechanism. The driving mechanism comprises a stator, a coil and a mover. The stator has two groups of driving groups. The first group of driving groups comprises two stator arms arranged along a first direction. The second group of driving groups comprises two stator arms arranged along a second direction. The first and second groups of driving groups form U-shaped magnetic flux loops. The stator has a double-U-shaped cross structure to ensure compactness. The mover is arranged in a movable area surrounded by the stator arms. The mover is drivingly connected to the moving platform and guided by the guide mechanism. Each group of driving groups is wound with a coil. The application has the advantages of high integration, light weight and large stroke. The direct current bias magnetic flux generated by the permanent magnet only passes through the side surface of the mover along the movement direction and does not generate magnetic interference force in the non-movement direction, thereby avoiding parasitic movement in the non-movement direction and improving the comprehensive performance of the positioning platform device.