34 results about "Ampere force" patented technology

The application provides an electromagnetic inertial actuator, permanent magnets, inner yoke iron and outer yoke iron are fixedly connected by using non-magnetic retainer, so that only ampere force exists in the magnetic circuit system, and good output linearity of the actuator is ensured. On this basis, disc-shaped spring plates with quasi-zero stiffness characteristics are arranged, the inherent frequency of the system is reduced, and low-frequency output performance is ensured. The permanent magnets, the inner yoke iron, the outer yoke iron, the end cover and the heat dissipation device are integrally designed, a large inertial actuator mover mass is formed, the effective mass of the actuator, i.e. the ratio of the mass of the movable part to the total mass, is maximized. In this way, the low-frequency output and the output value per unit mass can be improved, the total volume and mass of the inertial actuator are effectively reduced, and the installation space is saved. Meanwhile, increasing the mass of the mover can effectively reduce the low-frequency vibration displacement of the inertial actuator, and the quasi-zero stiffness characteristics can be further ensured to be realized and stable.

The utility model discloses a servo tachometer unit structure with a magnetic damper, and belongs to the technical field of aviation brake structures. Comprising a stator assembly (1), a rotor assembly (2), a damper assembly (3), a damper iron core (4), a pin (5) and a bearing (6). When the servo tachometer unit works, the rotor assembly 2 runs at a high speed, the rotor assembly 2 belongs to a conductor in a magnetic field of the stator assembly, the conductor cuts magnetic induction lines and generates induction current when moving, and the induction current generates ampere force opposite to the original moving direction of the conductor in a magnetic field provided by the damper assembly 3. Deceleration and stable control of the conductor, namely the rotor assembly 2, are realized; when the servo tachometer unit works, the rotor assembly rotates at a high speed, the magnetic damper provides a reverse magnetic field for the rotor assembly, deceleration and stable control over the rotor assembly are achieved, and the servo tachometer unit stops rotating quickly during high-speed work and works more efficiently.

The utility model relates to the technical field of Ampere force exploration, and discloses an Ampere force exploration device used under holographic perception, which comprises a supporting plate, a bottom rod is fixedly connected onto the supporting plate, a control circuit board is mounted on the bottom rod, a double-pole double-throw switch is arranged on one side of the control circuit board, and the other side of the control circuit board is provided with an optical fiber. The double-pole-double-throw switch is electrically connected with a first wire, a second wire, a third wire and a fourth wire, and the top of the supporting plate is fixedly connected with a current direction indicator. According to the utility model, the main body of the device adopts a vertical structural design, so that demonstration in scenes such as classroom teaching and the like is very convenient, a good visual effect can be provided for students, the students can conveniently observe and understand experiment phenomena, and meanwhile, in the experiment process, the experiment efficiency is greatly improved. The first lead, the second lead, the third lead and the fourth lead can obviously deflect left and right, the direct phenomenon can clearly demonstrate the direction of the Ampere force borne by the leads, and students can clearly know the acting effect of the Ampere force at a glance.

The present application discloses a coating device (20) and a production system (90). The coating device (20) is used for preparing a coated product (101). The coated product (101) comprises a substrate (1011) and a metal film (1012). The coating device (20) comprises: a cooling assembly (201) comprising at least one magnetic field generating component for providing a magnetic field, and a current generating assembly (202) used for enabling a current to pass through the coated product (101), so that the direction of an ampere force applied to the coated product (101) in the magnetic field points to the cooling assembly (201). After being electrified, the metal film (1012) of the coated product (101) can be approximately regarded as an electrified conductor, and the electrified conductor experiences the ampere force in the magnetic field. Compared with methods of attaching cooling assemblies by means of electrostatic adsorption forces, the present application exhibits a relatively large ampere force, such that the coated product can be more tightly attached to the cooling assembly. The coated product prepared has a smoother surface and is more uniformly cooled by the cooling assembly, and the film surface is not prone to damage, so that the probability of deformation of the film surface can be reduced, thereby improving the yield of the coated product.

Disclosed are a winding apparatus and a winding method, the winding apparatus includes: a winding needle, being configured to wind a winding material; a power supply assembly, being configured to be electrically coupled to the winding needle, so as to form current on an axis of the winding needle; and a magnet supply assembly, being configured to provide a magnetic field to the winding needle, a magnetic field direction intersecting the axis of the winding needle so that the winding needle generates an ampere force for resisting a deformation of the winding needle in the magnetic field when the winding material is wound. By the above method, the present application may reduce the deformation of the winding needle, reduce a defective rate of a winding product formed by the winding of the winding material, and improve quality of the winding product.

1. The name of the design product: Ampere force experiment frame. 2. The use of the design product: The design product is used as a teaching device, specifically for Ampere force experiment. 3. The design points of the design product: in shape. 4. The picture or photo that best indicates the design points: perspective view.

This invention relates to a device for eliminating wrinkles in the rolling process of lithium-ion battery electrodes. The device is positioned after the electrode (4) is rolled and before a tensioning mechanism or a winding mechanism. The electrode (4) includes a coated area and an uncoated area. The device includes at least two sets of rolling assemblies, each set symmetrically arranged on the upper and lower surfaces of the electrode (4). A conductive ring device (3) is mounted on each rolling assembly, directly contacting the uncoated foil (5) of the electrode (4). A magnet is positioned between adjacent rolling assemblies, generating a magnetic field perpendicular to the surface of the electrode (4). The uncoated foil (5) is subjected to Ampere force in the magnetic field, generating a non-contact tensioning force to both sides, thus eliminating rolling wrinkles. Compared with the prior art, this invention utilizes the non-contact method of Ampere force to improve the uneven stress field within the lithium-ion battery electrode after rolling, effectively solving the wrinkles and buckling problems that occur during the rolling process.

The invention belongs to a proportional electromagnet structure in the technical field of automobile parts. A winding (84) of the framework assembly (8) is wound on a framework body (82), a steel ball (81) and a small contact pin (83) are injected into the framework body (82) through an injection molding process, a plurality of permanent magnets and a plurality of rear yoke sleeves are sleeved on an outer ring of a central cylinder (321) with a hole, and the permanent magnets and the rear yoke sleeves are positioned on an inner ring of the winding (84); when the winding (84) is electrified, the current direction of one side of the winding (84) is from inside to outside, the current direction of the other side of the winding (84) is from outside to inside, and the winding (84) is subjected to Ampere force in a constant magnetic field. Compared with a traditional proportion electromagnet, the proportion electromagnet structure has the advantages that the moving coil structure design is greatly simplified, the requirement for part machining precision is remarkably reduced, high-quality horizontal characteristics can be output, the precision, stability and reliability of an automatic system are improved, and the cost is reduced.

The application discloses a rocking-preventing hoisting device and method based on nodular cast iron pipe jacking mold production and relates to the technical field of hoisting equipment. Through the electromagnetic damping principle of "magnetic field, conductor cutting and ampere force resistance", electromagnets are alternately arranged to form a closed magnetic field loop perpendicular to the vertical axis of the steel wire. When the steel wire shakes under external force, the steel wire as a conductor cuts the magnetic induction lines to generate an induced current. The induced current is subjected to an ampere force in the magnetic field, which is opposite to the shaking direction, so that the shaking energy is rapidly attenuated. Compared with the traditional mechanical damping, the mechanism has no mechanical contact wear, the response time is greatly shortened, and the problems of damping hysteresis and slow shaking attenuation of the traditional device are solved. Meanwhile, the thermal energy driving unit drives the resistance adjusting sliding block through the thermal expansion of the heat conducting oil, automatically reduces the resistance of the sliding resistor, further increases the induced current and the damping force, and significantly shortens the shaking attenuation time compared with the fixed damping scheme.

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 invention discloses an electromagnetic tensioner based on the Ampere force principle. The electromagnetic tensioner comprises a plurality of permanent magnets and at least one electric conductor. The plurality of permanent magnets comprise at least two groups of magnetic pole units, and each group of magnetic pole unit is formed by arranging two permanent magnets symmetrically and oppositely, so that a magnetic gap space with a uniform magnetic field is formed. The electric conductor movably and vertically penetrates through the magnetic gap space, and the movement track of the electric conductor is restrained by the mechanical limiting device so as to ensure that the electric conductor is always located in the magnetic gap space in the working process. The relative relation between the magnetic field direction and the conductor current direction is directionally designed, so that Lorentz force vectors generated by the electric conductor in a power-on state form a same-direction superimposed effect. By controlling or adjusting the magnitude and direction of the input current, the output force can be adjusted very accurately, sensitively and quickly.

This disclosure relates to a loudspeaker and an electronic device. The loudspeaker includes a vibration system and a magnetic circuit system. The magnetic circuit system includes an electromagnet, which provides a magnetic field to cause the vibration system to vibrate and produce sound. The strength of the magnetic field generated by the electromagnet is positively correlated with the intensity of the current flowing through it. In this embodiment, a sufficiently large current can be passed through the electromagnet to generate a stronger magnetic field than that of a permanent magnet in the prior art, thereby generating a stronger Ampere force to drive the vibration system to vibrate and improving the loudspeaker's external sound performance. In addition, a variable magnetic field can be generated when the intensity of the current flowing through the electromagnet changes. The magnetic field strength can be adaptively adjusted according to the length of the magnetic field lines cut by the vibration system to keep the BL curve uniform, reduce or avoid distortion or noise, and improve the external sound quality of the loudspeaker.

The invention provides an anti-shake circuit board assembly and application thereof. According to the invention, the permanent magnet is arranged on the first circuit substrate, and the first coil is arranged on the second circuit substrate, so that the Ampere force generated by the first coil in the magnetic field of the permanent magnet can drive the first circuit substrate to move in the thickness direction, thereby driving the image sensor to move in the thickness direction. Therefore, displacement offset caused by shaking can be compensated, and the anti-shaking function is achieved. According to the anti-shake circuit board assembly, the first area of the second circuit substrate is connected with the side surface of the first circuit substrate, so that the size of the anti-shake circuit board assembly can be reduced.

The invention discloses a film coating device and a production system, the film coating device is used for preparing a film coating product, the film coating product comprises a base material and a metal film, and the film coating device comprises: a cooling assembly comprising at least one magnetic field generating part for providing a magnetic field; and the current generation assembly is used for enabling current to pass through the coated product, so that the Ampere force applied to the coated product in the magnetic field points to the cooling assembly. After the metal film of the coated product is electrified, the metal film can be approximately regarded as an electrified conductor, and the electrified conductor is subjected to Ampere force in a magnetic field. Compared with the mode that electrostatic adsorption force is attached to the cooling assembly, the Ampere force is large, and the coated product can be attached to the cooling assembly more tightly. In this way, the surface of the prepared coated product is smoother, cooling is more uniform through the cooling assembly, the film surface is not prone to damage, and therefore the probability of film surface deformation can be reduced, and the yield of the coated product is increased.

An amper force demonstration instrument, including base, the upper end middle part of base is equipped with pressure sensor, the upper end of pressure sensor is equipped with adjustable coil, the upper end of base is equipped with support rod in left and right opposite sides vertically, support rod is connected with crosspiece between, the middle part of crosspiece is vertically equipped with connecting rod, crosspiece and connecting rod rotate and cooperate, the upper end of connecting rod is equipped with limit rotation subassembly for limiting rotation angle, the middle part lower end of crosspiece is equipped with angle scale, be equipped with pointer on connecting rod, the lower end of connecting rod is connected with placing rack, the lower end of placing rack is equipped with the subassembly that can adjust magnetic induction intensity and keep magnetic field size distribution uniform. The utility model discloses through pressure sensor and adjustable coil cooperation, can directly measure amper force size, and can enhance magnetic induction intensity, and realized the multiple superposition of magnetic induction intensity, accurate adjustment magnetic induction intensity makes the magnetic force size distribution of magnetic field uniform, satisfies different experimental demand.

The electromagnetic actuator device for increasing initial thrust with electromagnetic assistance belongs to the technical field of aerospace. The present application solves the problem that the existing electromagnetic actuator has small initial thrust, which 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 yoke and a stator coil structure, the outer magnetic structure is sleeved outside the inner magnetic structure, the mover comprises a mover coil structure, the mover coil structure comprises a mover coil framework and a mover coil arranged on the mover coil framework. The stator coil is given opposite current to the mover coil, the strong electromagnetic field generated is opposite to the electromagnetic field generated by the mover coil, and the electromagnetic field generated by the stator coil generates strong thrust on the mover coil structure at the moment of electrification. On the basis of the ampere force suffered by the original coil in the permanent magnetic field, a large electromagnetic repulsive force is additionally suffered, the initial thrust suffered by the mover coil structure is increased, and the target spacecraft separates at a predetermined speed.

The utility model discloses a double magnetic circuit structure of ultrathin woofer, including shell, magnetic member, voice coil, damper and cone, the magnetic member includes first magnet and second magnet, first magnet is provided at one end portion of shell, second magnet is coaxially sleeved with first magnet inner side and is fixedly connected with first magnet, and the cone is provided with the first magnet. One end portion of the voice coil extends between the first magnet and the second magnet. The inner side and the outer side of the voice coil are respectively provided with one magnet, double magnetic circuits can be formed in the same loudspeaker space, compared with a conventional single magnet, the double-magnetic-circuit loudspeaker can generate larger magnetic field intensity when acting with the voice coil under the same condition, larger ampere force is formed to act on the voice coil, the cone is driven to generate larger amplitude, the sound loudness is improved, and the sound quality is improved. And the magnetic field can be relatively more uniform and stable through the washer, so that the fidelity of sound is improved to the greatest extent, and the sound effect quality of the loudspeaker is improved.

The application discloses a high-sensitivity hot cathode ionization gauge which can be used in a strong magnetic field environment and has a lower lower limit of measurement, and the hot cathode ionization gauge mainly comprises a cathode filament, an anode grid, an ion collecting electrode and a metal shell; wherein the cathode filament is a spiral thick filament structure and is used for resisting the Ampere force in the strong magnetic field; the anode grid is a spiral structure or a cage structure, which comprises a left anode grid and a right anode grid and is symmetrically arranged with the cathode filament as the center; the ion collecting electrode is a metal filament structure, which comprises a left ion collecting electrode and a right ion collecting electrode; the metal shell is a cylindrical structure, and the electric potential of the metal shell is arranged to be grounded; the cathode filament, the anode grid, the ion collecting electrode and the metal shell are coaxially arranged, and when working in the magnetic field environment, the electrode axis arrangement direction is parallel to the magnetic field direction. Compared with the traditional hot cathode ionization gauge used in the strong magnetic field environment, the application can effectively prolong the service life of the cathode filament, improve the sensitivity of the ionization gauge, and extend the lower limit of measurement to 10 ‑9 Pa.

This invention discloses a magnetic induction intensity measuring device, comprising a base plate, with support frames mounted at both the front and rear ends of the base, a rotating shaft mounted on the support frames and rotatably connected to the support frames, a coil fixedly mounted on the base plate to the right of the rotating shaft, the rotating shaft passing through the axis of the left side frame of the coil, and the coil being fixed to the rotating shaft by a fixing device, a pressure sensor and a pressure digital display screen fixedly mounted on the base plate; a pressure sensor is mounted on the base plate below the right side frame of the coil, and a pressure digital display screen is mounted on the right side above the base plate, the pressure sensor and the pressure digital display screen being connected via a data cable, and a magnet is mounted above the base. Using this magnetic induction intensity measuring device, the influence of the Ampere force generated in the opposite direction by the wire on one side of the coil on the Ampere force generated by the wire on the other side of the coil when calculating the magnetic induction intensity B can be eliminated, thus improving the accuracy of magnetic induction intensity measurement.

The utility model discloses an ampere force demonstrator which comprises a base, a pointer support, a pointer assembly and a magnet support. The pointer bracket is fixed on the upper surface of the base; the pointer assembly comprises at least two conductive wiring pieces, a power-on wire frame and a pointer body. One ends of the two conductive wiring pieces are fixedly connected with the magnet bracket, and the other ends extend out of the magnet bracket; the connecting part is movably connected with one end, far away from the magnet bracket, of the conductive wiring piece; the pointer body is fixedly connected with the outer wall of the electrified wire frame; the magnet support slides on the upper surface of the base and is located on one side of the magnet support, and the upper surface of the magnet support is provided with a U-shaped magnet set capable of penetrating into a space defined by the electrified wire frame. Through the arrangement, the Ampere force demonstration instrument can clearly demonstrate the relationship between Ampere force and each influence factor, and is convenient to use in physics teaching.

This invention belongs to the field of motor technology and discloses a method and system for identifying the initial magnetic pole angle of an embedded permanent magnet synchronous motor. The method includes the following steps: sequentially performing a coarse scan and a fine scan on the permanent magnet synchronous motor, as follows: (a) energizing all coils; (b) calculating the direction of the resultant Ampere force and the total voltage on the coils, adjusting the current in the coils so that the direction of the resultant Ampere force on the coils satisfies the preset target resultant force direction and total voltage of the coarse / fine scan, and calculating the total current in the coils; (c) adjusting the target resultant force direction according to a preset step size, returning to step (b), until the upper limit of the preset target resultant force direction is reached. This invention solves the problem that existing methods cannot easily, conveniently, and accurately identify the initial magnetic pole angle of the rotor.

The application belongs to the technical field of precision machining, and particularly relates to a hook-shaped probe and a preparation method and application thereof. The hook-shaped probe comprises the following steps: a tungsten wire with a diameter of 60-100 microns is stretched into a conical shape by using a hot wire drawing method to obtain a conical probe rod; a smaller end of the conical probe rod is melted into a spherical shape by arc discharge; an external magnetic field in the horizontal direction is applied during the arc discharge process, and the eccentricity of the spherical shape is controlled by the Ampere force generated by the magnetic field to obtain a spoon-shaped probe; under a 10V direct current voltage, the spherical end of the spoon-shaped probe is immersed in an etching solution, and the spoon-shaped probe is periodically extracted and immersed in the alkaline solution at a uniform speed of 0.1-0.5 seconds and 1-10 microns per second to obtain a needle tip portion with a radius of curvature of 30-50 nanometers. The time for preparing a probe by using the method in the application is not more than 8 minutes, the TSV cavity detection rate is greater than 99%, and the aperture deviation is greater than or equal to 5%.

The application discloses a kind of localized vibration self-adaptive suppression device and a kind of centrifugal impeller, the device includes piezoelectric sheet and permanent magnet;Piezoelectric sheet is connected with resistance, resistance is located in the magnetic field range of permanent magnet;The current flowing through the resistance generates ampere force opposite to the direction of local vibration under the magnetic field of the permanent magnet when the device works.When local vibration occurs, mechanical force acts on piezoelectric sheet, alternating current is generated on piezoelectric sheet, output to resistance, realize the consumption of electric energy, simultaneously, the alternating current generated under the action of the magnetic field of permanent magnet, will generate ampere force opposite to the direction of local vibration, the ampere force can effectively offset the mechanical force of impeller local vibration, realize impeller vibration localized suppression.In addition, the charge amount generated by electromechanical coupling is proportional to the amplitude of impeller local vibration, i.e.the size of ampere force is proportional to the mechanical force of impeller local vibration, so it can be self-adaptively adjusted, effectively realize impeller vibration localized suppression.

The present disclosure relates to the technical field of electronic control devices, and in particular to a relay. The relay includes a contact part. The contact part includes a movable contact assembly and a stationary contact assembly; a movable contact member of the movable contact assembly corresponds to the stationary contact assembly; The contact part further includes a magnetic conduction group, the magnetic conduction group includes a movable magnetic conductor and a stationary magnetic conductor, the movable magnetic conductor is disposed between a middle position and the swing end of the movable contact member, and at least part of the movable magnetic conductor is fixed to the movable contact member; the stationary magnetic conductor is positionally fixed relative to the stationary contact assembly and at least part of the stationary magnetic conductor is located on a side of the movable contact member facing the corresponding stationary contact assembly, so that the two are capable of forming a magnetic loop and attract each other based on a magnetic field generated when a current flows through the movable contact member and / or the stationary contact assembly, and at least the stability of a part of the movable contact member where the movable magnetic conductor is mounted is enhanced, and a degree to which the swing end warps due to deformation caused by an Ampere force acting on the middle position of the movable contact member is reduced. The relay can improve the contact stability of the contact part in the closed state by optimizing its own structure, improving the safety performance of the relay. (FIG. 2)

The utility model discloses a space-saving two-dimensional transfer driving module and keycap detection mechanism, which relates to the field of keycap detection and comprises a two-dimensional transfer driving module and a keycap detection module. The two-dimensional transfer driving module comprises an X-axis driving module and a Z-axis driving module, so that the accurate movement of the detection module in X and Z directions is realized; the X-axis driving module is composed of a first mounting base, a first rectangular coil, a first magnetic block assembly and a second magnetic block assembly, the magnetic block assemblies are provided with magnetic channels, the side edges of the coils penetrate into the magnetic channels, the same-direction Ampere force is generated by means of current and a magnetic field to drive X-direction movement, and stability of sliding blocks and sliding rails is guaranteed. The Z-axis driving module is similar in structure and is matched with a tension spring and a sliding rail, and a second rectangular coil is narrow in X-direction material thickness so as to save space; the keycap detection module comprises a pressure sensor and a selectable drawing hook claw / pressing assembly, and can complete corresponding detection. The whole device is of an X-direction thin type three-dimensional structure, multiple sets can be arranged in the X direction to achieve multi-module independent driving, and occupied space is reduced. The magnetic block and the coil form a voice coil motor, thereby improving operation speed and detection efficiency.

This invention discloses a comprehensive load simulation device for servo mechanisms based on electromagnetic friction damping loading, belonging to the field of servo mechanism testing technology. It addresses the problems of small-angle torque dead zone, unstable loading, and difficulty in simulating multiple loads in existing friction loading methods. Its structure includes a base, on which a transmission shaft assembly converts linear motion into rotational motion. Friction, inertia, and elastic load loading components are sequentially connected to the transmission shaft assembly. The friction load loading component includes a conductive rotating arm that rotates synchronously with the transmission shaft assembly and a magnet fixed to the base. The end of the conductive rotating arm extends into the uniform magnetic field generated by the magnet and is electrically connected to an external power supply circuit. This invention generates equivalent friction damping based on the Ampere force principle, eliminating the dead zone established by small-angle torque, ensuring stable and controllable friction torque, and enabling independent or combined loading of three types of loads. It has the advantages of high precision, flexible adjustment, and reliable structure.

The invention belongs to the technical field of precision machining, and particularly relates to a hook type probe and a preparation method and application thereof. Comprising the following steps: stretching a tungsten filament with the diameter of 60-100m into a cone shape by adopting a hot wire drawing method to obtain a conical probe rod; the small end of the conical probe rod is fused into a sphere through arc discharge, an external magnetic field in the horizontal direction is applied in the arc discharge process, the eccentricity of the sphere is controlled through Ampere force generated by the magnetic field, and the spoon-shaped probe is obtained. And immersing the spherical tail end of the spoon-shaped probe into an etching solution under the direct current voltage of 10V, and periodically extracting and immersing into alkali liquor at the time interval of 0.1-0.5 s and the constant speed of 1-10mu m / s to obtain a tip part with the curvature radius of 30-50nm. According to the method, the time for preparing one probe does not exceed 8 min, the TSV hole detection rate is larger than 99%, and the aperture deviation is larger than or equal to 5%.

The utility model relates to a forward and reverse direct winding reel, motor, camera and electronic equipment, the forward and reverse direct winding reel comprises a reel body, a plurality of winding grooves arranged on the reel body and a reversing column arranged on the reel body, coils are wound in the winding grooves, the plurality of winding grooves are distributed at intervals, the reversing column is arranged on the reel body, and the reversing column is arranged on the reel body. A gap exists between every two adjacent winding grooves, the reversing columns are arranged in the gaps, and the current directions of coils wound in every two adjacent winding grooves are opposite to each other after the coils pass through the reversing columns. The coil holder body is provided with a plurality of winding grooves distributed at intervals, the reversing columns are ingeniously arranged between every two adjacent grooves, the winding direction is changed, the directions of currents of coils wound in the adjacent winding grooves are opposite, the magnets are reasonably assembled, the directions of Ampere forces generated by all the winding grooves are consistent after the coils are powered on, and therefore the winding effect is improved. Therefore, bidirectional current driving is realized.

The application provides a tire and road surface friction coefficient measuring device and a measuring method, the measuring device comprises a bearing body, a tire, a wheel shaft, a transmission part, a magnetic field generator and a wire frame, the bearing body is driven by an external force to move the tire through the wheel shaft, the wheel shaft is arranged on the bearing body, the transmission part is arranged on the bearing body, the magnetic field generator is arranged on the bearing body, the wire frame comprises a rotating part and a coil, the rotating part is in transmission connection with the wheel shaft through the transmission part, and the coil is located in a uniform magnetic field and is fixedly connected with the rotating part; the magnetic field generator and the wire frame are arranged, the coil is located in the uniform magnetic field generated by the magnetic field generator during testing, the coil is subjected to the action of an ampere force after being electrified, and the rotating part is hindered from rotating, when the rotating part stops rotating, a torque equation acting on the rotating part is established, and the friction coefficient between the tire and the road surface can be measured according to the current in the coil, so that the measured friction coefficient is accurate, and the measuring efficiency of the measuring device is improved.

This invention discloses a force feedback device and an electronic device. The force feedback device includes a housing, a linear drive assembly, and an operating unit. The linear drive assembly includes a stator fixedly disposed within the housing, a mover slidably disposed within the housing along a first direction, and a pushing unit fixedly connected to the mover. One of the stator and the mover is a flat coil, and the other is a magnetic structure. The magnetic structure forms a magnetic field, and the flat coil is located within the magnetic field. The operating unit includes an operating body, which is rotatably mounted on the outside of the housing in directions toward and away from the pushing unit to drive the pushing unit. The Ampere force generated by the flat coil and the magnetic structure is fed back to the mover, and then fed back to the user's finger through the operating body, thus completing the force feedback. Furthermore, the flat coil is flat, which makes the force feedback device occupy less space.