247 results about "Moving magnet" patented technology

The invention discloses a vibration device and electronic equipment, the vibration device comprises a vibrator assembly and a stator assembly, the vibrator assembly comprises a moving magnetic part, the stator assembly comprises an iron core and a coil wound on the iron core, the vibrator assembly and the stator assembly are arranged at intervals along a second direction, and the vibrator assembly vibrates along a third direction perpendicular to the second direction. The axial direction of the iron core is parallel to the third direction, at least one end of the iron core along the third direction is provided with a fixed magnetic part, and the fixed magnetic part and the moving magnetic part form a magnetic loop; the magnetizing direction of the fixed magnetic part is parallel to the third direction; the movable magnet and the fixed magnetic part form four closed magnetic circuits penetrating through the coil, and the four closed magnetic circuits are located in four directions of the coil, so that the magnetic leakage of the product can be effectively reduced, the utilization rate of the magnetic field is improved, and the driving force of the product is improved.

An information handling system peripheral mouse accepts scroll inputs at a scroll wheel extending from the upper surface of the mouse. The scroll wheel rotates about an axis and has a chamber inside a the wheel that is filled with MR fluid having particles that interact with a magnetic field so that the viscosity of the fluid varies based upon he presence of a magnetic field. A sliding magnet carrier moves magnets relative to the scroll wheel to adjust the MR fluid viscosity and the amount of haptic feedback created at blades within the chamber that resist the passage of the MR fluid.

The invention discloses a high-precision linear vibration feedback motor system, and relates to the technical field of precise electromagnetic driving, and the system comprises a core driving module which is a moving magnet type linear motor of a Halbach array magnetic circuit structure, and is integrated with a multi-physics field sensing unit; the dynamic parameter tracking module is used for acquiring a reed rigidity coefficient, a damping coefficient and a magnetic constant in real time when the motor runs, and establishing a dynamic displacement model based on a recursive least square method; a double-closed-loop control framework is adopted, an inner loop adopts field-oriented control, and an outer loop is based on model prediction control; the aging prediction unit activates a temperature rise compensation algorithm when the accumulated number of vibration times is greater than a set threshold value; the self-adaptive calibration engine is used for injecting a sweep frequency excitation signal when the system is started, and automatically compensating individual difference parameters according to the harmonic peak offset; and the digital twin mapping unit is used for establishing a real-time mapping relationship between the physical parameters of the motor and the virtual model, and dynamically correcting the model parameters by comparing the actual displacement with the model displacement.

The invention discloses a rigidity-adaptive three-degree-of-freedom low-frequency electromagnetic vibration isolator, and belongs to the technical field of precise vibration isolation. The rigidity-adaptive three-degree-of-freedom low-frequency electromagnetic vibration isolator comprises three sets of low-frequency electromagnetic vibration isolators formed by connecting rigidity-adaptive electromagnetic arrays and spiral springs in parallel. The spiral spring stably supports the load in a passive mode and effectively isolates vibration of middle and high frequency bands; the rigidity self-adaptive electromagnetic array generates high negative rigidity through a moving magnetic array and a fixed magnetic array which are composed of four columns of vertically magnetized equal-cross-section cubic permanent magnets, coil current is adjusted in real time through acceleration feedback, external excitation and load mass changes are responded, the negative rigidity is dynamically adjusted, and the requirement for three-degree-of-freedom near-full-band vibration isolation is met. The vibration isolator has adjustable low dynamic rigidity in the vertical and horizontal rotation freedom degrees, the vibration isolation frequency is low, the frequency band is wide, a super-quiet environment is provided for tip equipment, and the instrument precision is remarkably improved.

The invention discloses a vibration device and electronic equipment, the vibration device comprises a vibrator assembly and a stator assembly, the vibrator assembly comprises a moving magnetic part, the stator assembly comprises an iron core and a coil wound on the iron core, the vibrator assembly and the stator assembly are arranged at intervals along a second direction, and the vibrator assembly vibrates along a third direction perpendicular to the second direction. The axial direction of the iron core is parallel to the third direction, at least one end of the iron core along the third direction is provided with a fixed magnetic part, and the fixed magnetic part and the moving magnetic part form a magnetic loop; the moving magnetic part comprises a moving magnet, the moving magnet is provided with two magnetic areas in the third direction, and the magnetizing directions of the two magnetic areas are opposite; the moving magnetic part adopts a multi-pole magnetizing magnet, so that the structure is simple, and the production and manufacturing process is optimized; the movable magnet and the fixed magnetic part form four closed magnetic circuits penetrating through the coil, and the four closed magnetic circuits are located in four directions of the coil, so that the magnetic leakage of the product can be effectively reduced, the utilization rate of the magnetic field is improved, and the driving force of the product is improved.

A crack quantification method and apparatus based on orthogonal twinning and used for oil and gas pipelines, and a storage medium. The method comprises: acquiring a triaxial magnetic flux leakage measurement signal modulus value of an inner wall crack or an outer wall crack under a condition of a unidirectional direct-current excitation, and acquiring a dynamic magnetic signal or an eddy current signal under a condition of a dynamic magnetic field excitation that is orthogonal to the direct-current excitation; inputting the triaxial magnetic flux leakage measurement signal modulus value into a crack signal orthogonal twin model, so as to obtain a magnetic flux leakage enhancement estimation signal, wherein the magnetic flux leakage enhancement estimation signal is a function of an orthogonal twin triaxial magnetic flux leakage signal modulus value, the orthogonal twin triaxial magnetic flux leakage signal modulus value is a magnetic flux leakage response signal modulus value under a condition of a virtual orthogonal twin direct-current excitation, and the virtual orthogonal twin direct-current excitation and the unidirectional direct-current excitation are in the same plane and have equal magnitudes and perpendicular directions; and extracting feature vectors from the magnetic flux leakage enhancement estimation signal and the dynamic magnetic signal or the eddy current signal, and inputting the feature vectors into a crack scale estimation model, so as to obtain the size and inclination angle of a crack.

The magnetic suspension blood pump is high in integration level, small in magnetic field coupling degree and high in regulation and control precision and comprises a pump shell, an impeller, a motor unit and a magnetic suspension unit, and the axial suspension state of the impeller is jointly maintained through the magnetic acting force between an electromagnet assembly and a suspension magnet assembly and the magnetic acting force between a motor stator assembly and a motor rotor magnet; the repulsive force of the static magnetic ring array and the movable magnetic ring array maintains the radial suspension state of the impeller. The magnetic suspension unit and the motor unit are arranged at the upper end and the lower end of the impeller respectively, the distance between the magnetic suspension unit and the motor unit is increased in space, the magnetic coupling effect between the magnetic suspension unit and the motor unit is greatly reduced, control difficulty is remarkably reduced through independent control of the magnetic suspension unit and the motor unit, and system stability is improved. The special structural design improves the space utilization rate, reduces the size of the pump body, disperses a heat source and reduces the heat dissipation pressure; the bias magnetic field provided by the suspension magnet provides open-loop magnetic force in the axial direction, the closed-loop control force needing to be provided by the electromagnet assembly is greatly reduced, and the purposes of saving energy and reducing consumption are achieved.

The invention discloses an ultrasonic robot tail end zero-rigidity constant-force driver and a control method thereof.The ultrasonic robot tail end zero-rigidity constant-force driver comprises a shell, a negative-rigidity structure, a positive-rigidity structure and a control circuit board, the shell comprises an external main frame, a top cover and a base, the negative-rigidity structure comprises a fixed magnet and a movable magnet set, and the positive-rigidity structure comprises a positive-rigidity structure and a negative-rigidity structure; the fixed magnet is fixedly installed on the base, the movable magnet set is fixedly installed on the top cover, the positive stiffness structure comprises a linear servo motor, a displacement sensor, a linear spring and a spring seat, the movable magnet set and the fixed magnet generate negative stiffness through magnetic field interaction, and the linear spring generates positive stiffness through deformation. And the resultant forces are offset to realize zero-rigidity constant-force output. The control circuit board is installed in the base and electrically connected with the linear servo motor and the displacement sensor. The method is used for solving the problems that in the prior art, scanning efficiency is low, the method is sensitive to measurement errors, and ultrasonic scanning requirements of complex scenes are difficult to meet.

The invention discloses a two-dimensional large-angle fast reflecting mirror device based on a sheet-shaped flexible support, a flexible support assembly comprises a flexible connecting sheet of a hollow structure and a flexible connecting rod, one side of the flexible connecting sheet is fixedly connected with a reflecting mirror assembly, and the other side of the flexible connecting sheet is fixedly connected with a base; the axial direction of the flexible connecting rod is perpendicular to the plane where the flexible connecting piece is located and penetrates through the center of the flexible connecting piece, one end of the flexible connecting rod is fixedly connected with the center of one side of the reflector assembly, and the other end of the flexible connecting rod is fixedly connected with the center of one side of the reflector assembly. The electromagnetic driving assembly penetrates through the flexible connecting piece and then is fixedly connected with the reflector assembly and the base. The sensor assembly is fixedly arranged at the central position of the base and is spaced from the reflector assembly by a first preset distance. Through the collaborative design of a flexible connecting piece-flexible connecting rod composite supporting structure and an obliquely-arranged moving magnet type electromagnetic driving assembly, the two-dimensional large-angle deflection capacity of the magnitude of + / -10 degrees is achieved.

The invention belongs to the technical field of medical instruments, and discloses a magnetic coupling sealing intervention pump which comprises a motor, a first supporting seat, a driving magnetic ring, a driven magnetic ring, an impeller and a first connecting shaft, and the first supporting seat is fixed to the outer wall of the motor in a sealed mode to form a first assembling cavity; the output shaft and the driving magnetic ring are coaxially and fixedly arranged and are both arranged in the first assembling cavity in a sealed mode, and the output shaft rotates to drive the driving magnetic ring to rotate synchronously. The bottom of the first connecting shaft is fixed to the first supporting base, the impeller is rotationally connected with the first connecting shaft, and the driven magnetic ring is fixed to the lower end of the impeller and drives the impeller to rotate synchronously through magnetic torque generated by coupling of the driven magnetic ring and the driving magnetic ring. Rotation of the output shaft of the motor is transmitted to the impeller through magnetic coupling transmission between the driving magnetic ring and the driven magnetic ring, so that direct mechanical connection and sealing structures are not needed between the output shaft of the motor and the impeller, the leakage problem possibly caused by mechanical sealing in a traditional pump is avoided, and the sealing performance and reliability of the intervention pump are improved.

An orthogonal twinning method and apparatus for an oil and gas pipeline crack signal, and a storage medium. The method comprises: acquiring a triaxial magnetic flux leakage measurement signal modulus of an inner wall crack or outer wall crack under unidirectional direct current excitation conditions, and acquiring a dynamic magnetic signal or eddy current signal under dynamic magnetic field excitation conditions orthogonal to the direct current excitation; inputting the triaxial magnetic flux leakage measurement signal modulus into a crack signal orthogonal twinning model, and obtaining a magnetic flux leakage enhancement estimation signal; extracting a crack scale initial value from the magnetic flux leakage enhancement estimation signal and a 0-1 binarized signal thereof, and substituting the crack scale initial value into a magnetic dipole model of the inner wall crack or outer wall crack to iteratively calculate an optimal scale intermediate variable; and optionally, under the excitation of virtual orthogonal twinning direct current excitation, using the optimal scale intermediate variable as an input, and, by means of "dynamic magnetic or eddy current signal mapping", outputting a twin dynamic magnetic or eddy current response signal.

The utility model discloses a relay and an electricity meter. The relay comprises a static contact group and a movable contact group, and further comprises a movable magnetizer group and a static magnetizer. The movable magnetizer group and the movable contact group are relatively fixed, and the movable magnetizer group and the static magnetizer are oppositely arranged along the X-axis direction; the static magnetizer is fixed relative to one of other parts except the movable contact piece set and the movable magnetizer set, and static contacts of the two static contact pieces are located on the two sides of the static magnetizer respectively in the Y-axis direction. The projection of the part, suitable for making contact with the movable contact piece set, of each static contact on a second projection plane perpendicular to the Y-axis direction is located in the projection of the static magnetizer on the second projection plane, and the surface, facing the movable magnetizer set, of the static magnetizer is closer to the movable magnetizer set than all the static contacts in the X-axis direction. The electric meter comprises the relay. By adopting the above technical scheme, compared with the relay in the prior art, the relay is not easy to damage and has a longer service life.

The invention discloses a heavy-load precise micro-vibration isolation rigidity regulation and control configuration based on a vertical magnetization space electromagnetic array, and belongs to the technical field of precise vibration isolation. According to the vertical magnetization space electromagnetic array, 2n + 1 (n > = 1, n belongs to N +) layers are arranged in an array mode in the axial direction, a movable magnetic ring array and a fixed magnetic ring array are coaxially nested to construct a single-side high-flux-density magnetic field, wherein the movable magnetic ring array is composed of vertical magnetization uniform-section magnetic rings between the adjacent layers, and the high negative stiffness characteristic is achieved; and an acceleration feedback control algorithm is adopted to regulate and control the size and the direction of electrifying current in the coil so as to generate precise and controllable excitation magnetic flux and dynamically regulate the negative stiffness value. The vertical magnetization space electromagnetic array and the large-scale air floating micro-vibration isolator are connected in parallel to support the load platform, so that the local low dynamic stiffness characteristic can be generated under variable heavy load, the vibration isolation inherent frequency is effectively reduced, the vibration isolation frequency band is expanded to be close to a full frequency domain, and the vibration isolation efficiency is improved. And an ultra-quiet working environment is provided for tip instruments and equipment such as an ultra-precise photoetching machine, a high-resolution satellite camera and an ultra-precise machine tool, so that the leap-type improvement of the precision of the precise instruments and equipment is powerfully promoted.

The design method of the non-linear term offset moving-magnet vibrator meets the following conditions: (1) a moving-magnet vibrator body comprises an outer cylinder, a vibration transmission sheet, a stator assembly and a rotor assembly; and (2) the mover assembly is subjected to electromagnetic acting force of pushing force and pulling force in pairs at the same time and presents a push-pull type structural characteristic, so that linear terms in the acting force borne by the mover assembly are overlapped and become larger, and non-linear terms in the acting force borne by the mover assembly are partially or completely counteracted and are reduced, so that the linear terms in the acting force borne by the mover assembly are reduced, and the linear terms in the acting force borne by the mover assembly are reduced. And obtaining the moving magnet type vibrator with the counteracted nonlinear term.

The invention relates to the field of welding, in particular to a lead welding device for production of a high-voltage silicon stack assembly. In the prior art, the welding operation mostly depends on manual work or a simple mechanism for alignment and clamping, the problems of inaccurate positioning, large assembly deviation, unstable clamping and the like exist, and particularly in the application of high density, small size or complex structure, pseudo soldering, welding deviation or insufficient contact area of a lead body easily occurs. A lead welding device for production of a high-voltage silicon stack assembly comprises a shell. Two covers are rotationally arranged on the shell, two fixing frames are arranged in the shell, and a hopper is installed between the shell and the two fixing frames. A newly aligned movable magnet column is attracted through a fixed magnet column, automatic position correction of the rotating disc, the material pushing block and the lead body is achieved, in combination with limiting cooperation between a clamping groove and a clamping block, the positioning precision and the structural stability can be further improved, the welding attachment effect and the electrical connection strength can be improved, and the consistency and the welding reliability of products are fundamentally improved.

A vibration apparatus comprising: a vibration assembly comprising a counterweight block, a first magnet group and an elastic member, the first magnet group is fixed on the counterweight block, the vibration assembly is suspended in the vibration apparatus through the elastic member; a stator assembly comprising a coil and a second magnet group, the second magnet group is installed in a winding hole of the coil; the first magnet group comprises at least two side magnets, magnetization directions of the two side magnets are perpendicular to a plane on which the coil is located, the side magnets are magnetized in opposite directions, a magnetization direction of the second magnet group is parallel to the plane, two poles of second magnet group are respectively attracted to poles of side magnets adjacent to the coil, the vibration assembly is configured to produce vibration relative to the stator assembly.

The invention relates to a Halbach electromagnetic type quasi-zero stiffness vibration isolation platform which comprises a storage platform, a bottom plate, a positive stiffness assembly, a negative stiffness assembly and an active electromagnetic assembly, wherein the positive stiffness assembly, the negative stiffness assembly and the active electromagnetic assembly are arranged between the storage platform and the bottom plate. The positive stiffness assembly comprises a telescopic guide rod, a spring and an adjusting gasket arranged on the bottom plate, one end of the spring is connected with the storage platform, and the other end of the spring is connected with the adjusting gasket; the negative stiffness assembly comprises a fixed shell, a fixed magnet array and a movable magnet array; the active electromagnetic assembly comprises a metal coil. The fixed magnet array is formed by vertically arranging a plurality of first fixed magnets and second fixed magnets according to a Halbach array, the moving magnet array is formed by vertically arranging a plurality of moving magnets, and the sum of the vertical positive stiffness of the springs is equal to the maximum negative stiffness of the moving magnet array. Compared with the prior art, the vibration isolation performance of the vibration isolation platform is effectively improved, and the vibration isolation platform can be widely applied to occasions with high vibration isolation requirements.

The invention provides an air guide device for reducing concrete bubbles, a construction system and a construction method, and relates to the technical field of building construction.The air guide device comprises an air guide pipe, a fixed magnet, a connecting pipe, a movable magnet and a pipe taking mechanism, the fixed magnet is arranged on the inner wall of the top of the air guide pipe, the top of the fixed magnet is inserted into the connecting pipe, and the movable magnet is arranged on the outer wall of the connecting pipe; the driving end of the pipe taking mechanism is arranged on the outer wall of the connecting pipe below the movable magnet; the construction system comprises the air guide device, a pouring formwork and a vibrator, the pouring formwork is arranged in a to-be-poured area, the air guide device is arranged on the inner side of the pouring formwork, and the vibrator is arranged near the air guide device during use, so that the air guide device resonates with the vibrator; the gas guide device and the construction system are adopted in the construction method. According to the construction system with the air guide device and the construction method, during vibration, the vibrator, the air guide device and the pouring formwork are controlled to be matched, the bubble discharging efficiency is improved, and therefore concrete bubbles are reduced.

The invention relates to a wheel hub motor, in particular to an anti-magnetic-pulling-force and anti-deformation axial end face motor, and solves the technical problem that a rotor structure of an existing axial magnetic flux motor cannot resist attraction force of a rotor permanent magnet to stator teeth, so that the rotor structure is deformed. The axial end face motor capable of resisting magnetic pulling force and preventing deformation comprises a motor shaft, a rotor assembly, a stator assembly and a magnetic suspension assembly. The magnetic suspension assembly comprises two magnetic ring seats, 2K movable magnetic rings, 2K static magnetic rings and a plurality of adjusting bolts, wherein K is greater than or equal to 1; the two magnetic ring seats are respectively arranged in the first rotor magnetic ring groove and the second rotor magnetic ring groove through adjusting bolts, and the adjusting lengths of the two magnetic ring seats along the axial direction are equal; 2K moving magnetic rings are equally divided into two groups and are respectively adsorbed on the end surfaces, facing the stator, of the two magnetic ring seats; 2K static magnetic rings are equally divided into two groups and are respectively arranged in the first stator magnetic ring groove and the second stator magnetic ring groove, and the magnetic poles of the opposite end surfaces of the static magnetic rings and the movable magnetic rings are the same to form an axial suspension state.

The application relates to a double-side coupling axial nutational magnetic speed reducer and a working method thereof. The speed reducer comprises a box, an input shaft is arranged at the left end of the box, a rotating disc is arranged at the right side in the box, a nutational disc is arranged in the box and rotates with the input shaft, first and second nutational magnetic gears are arranged at the left and right end faces of the nutational disc respectively, a fixed magnetic gear is arranged at the left end of the box and is magnetically coupled with the first nutational magnetic gear, and a movable magnetic gear is arranged at the left end face of the rotating disc and is magnetically coupled with the second nutational magnetic gear. The double-side coupling axial nutational magnetic speed reducer can realize few-pole difference, has simple structure, large transmission ratio and high transmission efficiency, the axial forces generated by the axial magnetic gears on the two sides can be effectively offset, the service life of bearings is prolonged, the axial force is small, and transmission is stable.

The invention discloses an electric mechanism with a controllable vertical position. The electric mechanism comprises a motor shell, a coil assembly and a rotor assembly. By means of the structure that the bottom of the magnetic conductive shell protrudes inwards, resetting can be achieved without using a spring, and controllable ascending, descending and hovering of the rotor are achieved by controlling the magnitude of direct current in the two sets of coils; a cylindrical or polygon prism structure is adopted, so that the utilization rate of the permanent magnets and the windings is improved, the magnetic leakage is reduced, and the integrity is improved; a moving magnet type rotor is adopted, so that the impact inertia of the rotor is increased, and the risk that a winding coil breaks down is reduced; the built-in permanent magnets are adopted, so that the use amount of the permanent magnets is reduced, and the manufacturing cost is reduced; the two winding coils with different turns are used, so that the position of the rotor can be controlled; the bottom of the magnetic conductive shell of the motor protrudes inwards by a circle, so that the motor can fall back and hover at an initial position when in no load, a spring does not need to be used for resetting, and the initial position can be adjusted by adjusting a circle of inner ring protruding from the bottom.

The embodiment of the utility model provides a moving magnet type mouse wheel mechanism, which comprises a bearing unit, a wheel and a magnetic conductive piece, the bearing unit is provided with a first mounting piece and at least one second mounting piece, the wheel is arranged on the first mounting piece and can rotate, a plurality of magnetic poles are radially and sequentially distributed on the circumference of the wheel, and the polarities of the adjacent magnetic poles are opposite to each other; the magnetic conductive part is arranged on the second installation part, the magnetic conductive part faces the rolling wheel and is separated from the rolling wheel by a certain distance, the magnetic conductive part faces the magnetic poles in a non-contact mode, the size of a body of the magnetic conductive part is smaller than the size of two adjacent magnetic poles, and when the rolling wheel rotates, intermittent strong and weak magnetic restoring force can be generated between the magnetic poles and the magnetic conductive part. The joint of two adjacent magnetic poles of the roller is located at the extending position of the center line of the magnetic conductive piece.

The invention relates to a novel moving magnet type electromagnetic MEMS micromirror and a manufacturing method thereof.The novel moving magnet type electromagnetic MEMS micromirror comprises a coil platform and a coil, a mirror surface structure comprises a mirror surface body and a magnet arranged on the upper surface of the mirror surface body, the magnet is arranged above the coil, and the mirror surface body comprises a frame and a mirror surface platform arranged in the frame; the mirror surface platform is connected with the inner wall of the frame through the rotating shaft; the magnet and the coil are used for driving the mirror surface platform to realize two-dimensional deflection; according to the MEMS electromagnetic micro-mirror, electromagnetic force is provided for deflection of the mirror surface through cooperation of the magnet and the coil, and the problems of low magnetic energy density, poor thermal stability and low durability caused by deposition of a magnetic film on the mirror surface of a traditional MEMS electromagnetic micro-mirror are solved. By integrating the Hall device, the problem of real-time measurement of the rotation angle of the mirror surface is solved. In addition, a high-quality large-size mirror surface is manufactured, the problems that a traditional fast reflecting mirror is large in mass and low in integration degree are solved, and the problems that fast reflecting mirrors in other MEMS driving modes are small in deflection angle and small in mirror surface size are solved.

A transfer conveyor system for a semiconductor inspecting apparatus using a moving magnet includes a carrier in which a semiconductor wafer or a substrate is seated and accommodated and which is transferred, an armature which is provided to be accommodated in a permanent magnet plate under the carrier, a stator which is disposed to be spaced apart from the armature, is fixedly installed on a guide rail, a sensor unit which is installed at each of two ends of each motor coil, detects whether the armature approaches, senses a variation of the magnetic field, and measures a position of the armature from speed information of the armature, and a carrier monitoring unit which is provided on the carrier and monitors the carrier to detect an abrasion degree, a damage state, or an alignment / misalignment of the carrier in real time.

The present invention provides an active motion capsule robot with a hybrid drive mode, comprising a head unit and a tail unit movably connected to the head unit, wherein the outer surface of the head unit is provided with a first thread groove, the outer surface of the tail unit is provided with a second thread groove, the head unit is provided with a moving magnet, the tail unit is provided with a rotating magnet, the rotating magnet can rotate relative to the tail unit, the moving magnet and the rotating magnet constitute a magnetic spring mechanism, and an external magnetic field is applied to the magnetic spring mechanism. The active motion capsule robot can realize spiral drive forward or peristaltic drive forward according to the strength of the applied external magnetic field. The beneficial effects of the present invention are as follows: the active motion capsule robot of the present invention has the characteristics of a hybrid drive mode, can realize spiral drive forward and peristaltic drive forward, and when in different parts of the gastrointestinal tract, adopts different drive modes to realize active motion of the hybrid drive mode, thereby improving the forward efficiency of the capsule robot in the gastrointestinal tract.

A heavy-load precise gas-magnetic composite low-frequency micro-vibration isolator for high-end instrument equipment belongs to the technical field of precise vibration isolation and is formed by coaxially nesting a movable magnetic ring array and a fixed magnetic ring array, the movable magnetic ring array and the fixed magnetic ring array are both formed by 2n + 1 (n > = 1, n belongs to N +) layers of uniform-section magnetic rings which are arranged in an array manner along the axial direction and are vertically magnetized between the adjacent layers, the overall structure is vertically symmetrical about the (n + 1) th layer of magnetic ring; first-layer magnetic rings of the movable magnetic ring array and the fixed magnetic ring array are magnetized reversely along the radial direction, and the bottom surfaces of the first-layer magnetic rings coincide; when one layer is added, the magnetization direction of the movable magnetic ring is clockwise rotated by 90 degrees, and the magnetization direction of the fixed magnetic ring is anticlockwise rotated by 90 degrees; the device is simple in structure and convenient to install and maintain, high negative rigidity and zero magnetic force characteristics can be generated, the dynamic vibration isolation rigidity is reduced under the condition that heavy-load precise micro-vibration isolation bearing of dozens of tons to thousands of tons is not changed, and low-frequency or near-zero-frequency vibration isolation is achieved.

The invention provides an intraoperative dynamic positioning system and method based on a magnetic sensor array and a composite magnetic field, and the system comprises a composite excitation handle which is internally and non-coaxially integrated with a static magnetic source and a dynamic magnetic source, and generates a non-axisymmetric static and dynamic composite magnetic field; the self-adaptive sensing array is provided with a plurality of magnetic sensing nodes and is used for synchronously acquiring magnetic field signals; and the navigation processing terminal is used for processing the signal and resolving the pose. According to the method, static magnetic and dynamic magnetic components are obtained through synchronous acquisition and frequency domain decoupling; the method comprises the following steps: fitting the position and direction of a handle by utilizing a static magnetic component, and solving a rotation angle around a shaft by taking the position and direction as initial values and combining a dynamic magnetic component to realize full six-degree-of-freedom positioning; and finally, obtaining the navigation pose of the instrument tip through filtering mapping. According to the invention, full-attitude, high-precision and strong-interference-resistance intraoperative dynamic positioning is realized, and the problems of precision degradation and visual lag of traditional electromagnetic positioning in a metal environment are solved.

The invention discloses a direct-acting electromagnetic valve, and belongs to the technical field of vehicle suspension systems. The electromagnetic valve comprises a valve body assembly, a static magnetic assembly, a valve seat assembly, a movable magnetic assembly and an electromagnetic driving assembly. The key point is that a damping limiting structure is arranged between the peripheral side of the moving magnetic assembly and the inner wall of the valve body assembly. When the electromagnetic valve is powered on and opened, and the movable magnetic assembly moves to the maximum opening position, the damping limiting structure bears the impact force and limits the displacement of the movable magnetic assembly, so that a preset magnetic isolation gap is always kept between the second end of the movable magnetic assembly and the static magnetic assembly. Through non-contact limiting, metal impact noise is eliminated; by means of the constant magnetic isolation gap, long-term stability of electromagnetic force is guaranteed, and the problems that in the prior art, noise is large, the electromagnetic force is attenuated, sealing is poor, and the stroke is not stable are systematically solved.

The utility model discloses a magnetic gear transmission mechanism capable of reducing axial attraction, which comprises a driving magnetic wheel disc assembly, a driven magnetic wheel disc assembly, a magnetic grid adjusting device assembly, a magnetic resistance device assembly and a base assembly, and the driving magnetic wheel disc assembly and the driven magnetic wheel disc assembly are both rotatably connected with the base assembly. The magnetic grid adjusting device assembly is fixedly connected with the base assembly, and the driving magnetic wheel disc assembly and the driven magnetic wheel disc assembly are oppositely arranged on the two different sides of the magnetic grid adjusting device assembly respectively. The magnetic resistance device assembly comprises a first permanent magnet fixedly connected with the driving magnetic wheel disc assembly and a second permanent magnet fixedly connected with the driven magnetic wheel disc assembly, and repulsive force is generated between the first permanent magnet and the second permanent magnet to weaken or counteract axial magnetic attraction force between the driving magnetic wheel disc assembly and the driven magnetic wheel disc assembly. The starting and running performance of the magnetic gear can be effectively improved, and the energy transmission efficiency is improved.

The invention relates to the technical field of planar motors, in particular to a stator unit for a moving magnetic planar magnetic suspension motor and the motor. The stator unit comprises a plurality of basic units, the first coil unit, the second coil unit and the position sensor unit in each basic unit form an n * n square matrix, and n is an integer greater than 1; the first coil units and the position sensor units on any odd-numbered rows or odd-numbered columns of the n * n square matrix are alternately arranged; the position sensor units and the second coil units are alternately arranged on any even-numbered rows or even-numbered columns of the n * n square matrix, and the coil direction of the first coil units is perpendicular to the coil direction of the second coil units. The motor comprises the stator unit, and the stator unit and the motor break through the constraint of a traditional cable, replace a laser interferometer scheme of a traditional moving-magnet planar motor, and simultaneously support the pose measurement of a plurality of rotors in a single oversized working plane.