78 results about "Ampere force" patented technology

The present invention discloses a pin-on-disk type in-situ current-carrying friction testing system, and belongs to the technical field of friction performance testing. The friction testing system includes a pin-on-disk type friction pair, a current loading mechanism, and a magnetic field generating mechanism. The current loading mechanism includes a conductive terminal abutting against an annular sidewall of a disk specimen and used to guide a current in the disk specimen to flow along a horizontal direction, and the magnetic field generating mechanism is used to generate a magnetic field. When a pin specimen and a disk specimen rotate relatively, the pin specimen, the conductive terminal, and the magnetic field generating mechanism are relatively stationary, and an Ampere force generated by the current in the disk specimen flowing in the horizontal direction under the action of the magnetic field faces a support platform.

The invention discloses a material fatigue damage measuring device and method based on Ampere force loading. The device comprises a base support; the circular magnetic field generating device is fixed on a top plate of the base bracket and is connected to the magnetic field controller through a first lead to adjust parameters of a magnetic field; the two sliding contact clamps are installed on the baffles on the two sides of the base support respectively. A to-be-tested material is fixed between the two sliding contact clamps, and the sliding contact clamps clamp the to-be-tested material through a sliding contact structure; the constant current source is connected to the two ends of the to-be-tested material through a second wire to form a closed loop, and ampere force is generated when current passes through the to-be-tested material; the constant current source provides constant current for the to-be-tested material and has an overcurrent protection function; according to the method, the stress and fatigue damage of the material under the action of the Ampere force can be accurately calculated through accurate current and magnetic field control in combination with the calculation formula of the Ampere force.

The utility model relates to an experimental device for verifying the Ampere force law, which comprises a direct-current power supply, a high-power resistor, two metal electrodes respectively serving as a positive electrode and a negative electrode, a bracket, a precise length measuring tool, two opposite magnets, a container filled with conductive liquid and a high-precision electronic scale, the direct-current power supply is used for providing a power supply in an experiment; the high-power resistor is used for limiting the maximum current in the circuit and preventing the circuit from being short-circuited due to over-low loop resistance; the two metal electrodes which are respectively used as a positive electrode and a negative electrode are used for providing current for the conductive liquid which is used as a current carrier and conducting the whole circuit; the metal electrode is electrically connected with the high-precision direct-current power supply and the high-power resistor; the two opposite magnets are used for providing a magnetic field; the container filled with the conducting liquid is used for containing the conducting liquid serving as a current carrier and bearing Ampere force borne by the conducting liquid in a magnetic field.

The invention discloses a liquid cooling system for controlling pipeline reducing based on Ampere force and a working method of the liquid cooling system, and belongs to the field of liquid cooling system pipe diameter design. According to the Ampere force rule, an eight-copper-wire reducing device with a magnetic field is arranged at the joint of a first-stage pipeline and a second-stage pipeline, and multiple sections of wires are arranged in the composite magnetic field; the diameter-variable pipeline is connected between the wires, the wires are controlled to slide in the sliding grooves by controlling the direction and the size of current of the wires, the diameter of the pipeline is further controlled, and when the pipeline works normally, under the action of a magnetic field, the system counteracts pressure, acting on the wall face, of fluid flowing, so that the shape of the pipeline is maintained; when abnormal temperature difference occurs, the size of the pipe diameter can be controlled through Ampere force, so that the flow of cooling liquid is controlled, the cross sectional area of the variable-diameter pipeline can be adjusted in real time according to the specific numerical value of the temperature difference, and dynamic control over the flow is achieved.

The utility model provides a quantitative analysis Ampere force measuring and calculating instrument which comprises a machine base, and a magnet guide rail, two strong magnets, a rotating motor, a controllable coil assembly, a pressure sensor, a Hall sensor, a central control module, a display screen and a constant current source module are installed on the machine base. The two strong magnets are opposite to each other and are respectively mounted on the magnet guide rails in a sliding manner; an output shaft of the rotating motor is located between the two strong magnets and provided with a rotating disc. The controllable coil assembly is installed on the rotating disc and located between the two strong magnets, and a plurality of binding posts are arranged on the controllable coil assembly. The pressure sensor is mounted between the turntable and the controllable coil group; the Hall sensor is installed on the controllable coil assembly. According to the measuring and calculating instrument, a measuring mode of a traditional tension sensing system is replaced by a measuring mode of the pressure sensor, so that not only can the tension be measured, but also the pressure can be measured, the measuring accuracy is improved, and the quantitative relationship between the ampere force and each parameter can be more accurately and quantitatively analyzed.

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.

Disclosed is an Ampere force quantitative experimental device, including a coil, an electromagnet, a turntable, a bracket, a micro-force sensor, a current sensor, an angle sensor and a power supply. The bracket includes a base, a rotating support seat arranged above the base and a cantilever structure for arranging the micro-force sensor. The turntable is installed on the rotating support seat. Two electromagnets are arranged on the turntable and are respectively connected to the power supply. The angle sensor is arranged at the bottom of the bracket for detecting the rotation angle of the turntable. One end of the coil is suspended at the bottom of the micro-force sensor and placed between the two electromagnets. The power supply, the current sensor and the coil are connected in series to form a first loop, and the power supply and the electromagnet form a second loop. The experimental device of the invention has high measurement accuracy, stable data and high accuracy, and can comprehensively, quantitatively, intuitively and quickly measure the size of the Ampere force F and five related physical quantities (B, I l , L, Sinθ, θ) relationship.

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 invention discloses a multifunctional magnetic field and Ampere force measurement comprehensive experimental instrument, including a base, an electronic scale bracket fixedly arranged at the left end of the upper end surface of the base, an electronic scale fixedly arranged at the upper end of the electronic scale bracket, a square wire frame arranged at the upper end of the electronic scale pan, a square wire frame bracket arranged in the middle of the square wire frame, a square wire frame plane nail fixedly arranged at the left end of the square wire frame, a current-carrying circular coil, a Hall sensor and a Hall sensor lead connector fixedly arranged at the left and right ends of the square wire frame, a radial slide arranged at the lower end of the Hall sensor lead connector, a radial rotating drum wheel and a radial guide rail arranged at the lower end of the radial slide, and a transverse slide arranged at the lower end of the radial guide rail. The above technical scheme combines the measurement experiments of constant magnetic field and alternating magnetic field, reflects the difference between constant magnetic field and alternating magnetic field in electromagnetic effect, helps students recognize and understand the magnetic field distribution of current-carrying circular coil and Helmholtz coil, has reasonable structural design, is easy to use, and has good inventiveness.

Various Freight left hand rules (motor rules), right hand rules (engine rules), Ampere rules 1, Ampere rules 2 (right hand spiral rules), Lorentz forces, Ampere forces and the like exist in the fields of electrotechnics, electromagnetics, optics and the like and are used for judging current, magnetic fields and acting force directions. And memory disorder of students and technicians is easily caused. The electronic magnetic pole and the spinning direction (figure 1 in the specification) are marked by using an electronic spinning right-hand rule expression method, and all the rules and forces can be replaced and unified. And three breakthrough discoveries are caused: (1) an electron magnetic pole and a spinning direction rule are caused; and (2) the electromagnetic field is the expansion, static and retraction type expression of the electronic ring. And (3) the expansion type electronic ring has the characteristics of electromagnetic wave (including light wave) particles, fluctuation, electromagnetism, quantum and the like, and solves the optical hundred-year competition problem. And more electronic equipment and products can be developed according to the'electron spin right hand rule '.

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.

The utility model discloses a miniature loudspeaker, which comprises a vibration assembly, a yoke, and magnetic steel and a basin stand which are arranged on the yoke, the yoke is also provided with a plurality of magnet assemblies, each magnet assembly comprises a first magnet and a second magnet, and a gap is arranged between the first magnet and the second magnet; the vibrating assembly comprises a vibrating diaphragm and a voice coil which are connected with each other, the vibrating diaphragm is arranged on the basin frame, the voice coil is located in an area formed by the basin frame in a surrounding mode, the magnetic steel is arranged in the area formed by the voice coil in a surrounding mode, a plurality of wires are bonded to the outer side wall, away from the magnetic steel, of the voice coil, and at least part of the wires are located in the distance between the first magnet and the second magnet. According to the utility model, when the miniature loudspeaker works, the electrified wire moves up and down along with the voice coil to cut a magnetic induction line, so that the electrified wire is subjected to a corresponding ampere force, the current of the wire is changed, the magnitude of the force can be controlled, and the vibration state of the miniature loudspeaker is further controlled.

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.

The present invention discloses a low-frequency capacitive closed-loop acceleration sensor, which uses a multi-layer circuit board made of FR4 material as the main body of the low-frequency capacitive acceleration sensor. The main body circuit board includes: a mass block for detecting vibration; an elastic structure formed by CNC machining to form a folded cantilever beam; a coil structure in the middle layer of the circuit board and two groups of copper metal arrays on the top layer. A circuit board symmetric to the copper metal array is welded and fixed above the main body circuit board to form a differential capacitance plate. There is an acrylic shell with grooves outside, and a set of magnets with opposite magnetic fields in the vertical direction are placed at the left and right grooves respectively. Interfaces are left around the circuit board for introducing coil current, and combining with the magnetic field to generate Ampere force to achieve closed-loop control. The sensor of the present invention can detect low-frequency signals (<10Hz), has a simple production process, low material cost, and has good anti-interference and stability.

The invention discloses a self-adaptive stroke swing type surface microscopic cold forging device. The device comprises a mechanical interface, a holder motor, a rack, a permanent magnet, a bearing and a rotor. Wherein the rotor with the coil can freely rotate around a bearing on the rack, current is introduced into the coil, the coil is subjected to Ampere force in a magnetic field generated by the permanent magnet, the rotor is driven to rotate, and the impact head at the tail end of the rotor is further driven to impact the hole wall in a reciprocating mode; furthermore, along with rotation of a holder motor and axial feeding movement of a machine tool / mechanical arm, the hole wall of the whole inner hole is evenly and orderly impacted, and finishing and strengthening integrated machining of the hole wall is achieved. Compared with an existing swing type surface microscopic cold forging device with a built-in limiting structure, the hole wall serves as the limiting structure of the device, stroke self-adaption is achieved, and the swing type surface microscopic cold forging device has the advantages that the machining efficiency is high, impact on a machine tool spindle / mechanical arm joint is reduced, and the requirement for the positioning precision of a machine tool / mechanical arm is lowered.

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 invention discloses an electromagnetic anti-seismic drawing test machine and an anti-seismic method. The drawing test machine comprises a machine table, an oil cylinder, a sliding table, an upper clamping jaw, a lower clamping jaw, a first coil, a second coil and a reverse current control module, and a permanent magnet is arranged in a piston rod of the oil cylinder; when the reinforcing steel bar is pulled off, the piston rod vibrates due to impact force, the piston rod axially moves in the second coil, the second coil cuts magnetic induction lines, and induced current is generated; the induced current can be used as an indirect index of impact force; the first coil is electrified to generate corresponding reverse Ampere force, so that instant shock resistance can be realized, and reverse shock of the piston rod caused by overlarge reverse force is avoided; the reverse current control module can monitor the current value in the second coil in real time and then correspondingly change the reverse current required by the first coil according to the latest detected instantaneous maximum current value to form a closed loop of vibration detection, force feedback and dynamic adjustment.

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 discloses magnetic high-energy slump mass impact test equipment based on Ampere force acceleration. The magnetic high-energy slump mass impact test equipment comprises a shell, a left power-on guide rail, a carrier platform, a carrying box, acceleration rollers, a carrying box position sensor, a carrying box power supply guide rail and a right power-on guide rail. The electrified guide rail is divided into an accelerating section, a decelerating section and an insulating part located between the accelerating section and the decelerating section. And during acceleration, a conductive brush is adopted for flexible connection, so that a higher final release speed is realized. During speed reduction, power is cut off through the insulation part, then electromagnetic speed reduction is achieved through reverse power-on, and the length of the speed reduction section is shortened. Through the magnetic field generated by the coil on the inner wall of the object carrying box, the test body is in a suspension state in the object carrying box in a Lorentz force mode, it is guaranteed that the test body does not make contact with the object carrying box in the acceleration process, non-contact lossless carrying of the test body is achieved, the original shape and characteristics of the test body are maintained, and the test accuracy is improved. And the quick release of the test body is realized.

The present invention discloses a constant force rolling tool and rolling method for the root and end of external threads. The tool includes a rolling tool head, a pressure sensor, an electromagnetic force device, a cover plate, a tool handle, a laser sensor, and a magnet. Since the present invention uses an electromagnetic force device to utilize Ampere force to drive a rolling wheel to roll high-strength bolts, the rolling wheel generates rolling pressure on the root of the thread, ensuring that the uniform magnetic field strength B and the length L of the conductor rod remain unchanged. Before rolling begins, the pressure sensor feeds back the pressure magnitude to the voltage controller. The voltage controller ensures that the magnitude of the current I reaches the set value by changing the voltage magnitude. According to F 安 =BIL, ensuring constant rolling force during rolling. This invention uses a laser sensor, and the turret controller automatically calculates the retraction position based on the feed speed and position information fed back by the laser sensor. This ensures that the retraction command is executed only after the rolling tool has rolled the entire thread end, improving rolling accuracy and efficiency.

The utility model discloses an ampere force demonstrator, and belongs to the field of teaching experiment instruments. The demonstrator comprises a base, a coil rack is arranged on the base, and two magnetic devices are symmetrically arranged on the two sides of the coil rack along the center of the coil rack. A wire capable of being electrified is wound on the coil rack; a connecting part is formed at the lower end of the coil rack; the lower end of the connecting part is connected with a gravity sensor; the two magnetic devices can move towards each other and away from each other; the device further comprises a control center, the control center comprises a displayer arranged on the base, and the control center is electrically connected with the gravity sensor. According to the utility model, the gravity sensor is connected with the control center, and the magnitude of the Ampere force is directly read on the display screen through the gravity sensor, so that the magnitude of the Ampere force can be observed more visually. In addition, the current, the magnetic field intensity and the included angle between the magnetic field and the current can be adjusted through the control center, and various factors influencing the Ampere force can be conveniently experimented and explored.

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 invention relates to an on-line monitor comprising a monitoring instrument which is connected with a protector through a signal input line; the monitoring mechanism comprises a containing box, a monitoring assembly and a feedback assembly; wherein the monitoring assembly comprises a magnet block and a conductive straight rod, and the conductive straight rod is electrically connected with the signal input line; the feedback assembly is a pressure sensor. According to the invention, current flowing through the protector is transmitted into the monitoring instrument through the signal input line, the current flows through the conductive straight rod, the electrified conductive straight rod is acted by ampere force in a magnetic field formed by the magnet block, and then the ampere force is measured and transmitted by using the pressure sensor. The magnitude of the ampere force borne by the conductive straight rod changes accordingly, namely the current change can be reflected through the magnitude change of the ampere force measured and transmitted by the pressure sensor, and the current flowing through the composite monitoring type voltage limiting device is monitored in real time.

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 discloses a service life detection method, device and equipment of an electric vibration system and a medium. The electric vibration system comprises a moving part, and the life detection method comprises the following steps: obtaining an input current of the moving part during operation, and determining an ampere force borne by the moving part according to the input current; determining strain distribution information and stress distribution information of the moving part according to the Ampere force and a finite element analysis method; determining the estimated fatigue life of the moving part according to the strain distribution information, the stress distribution information and the material fatigue parameter of the moving part; and determining a life detection result of the electric vibration system according to the input current, the estimated fatigue life and the operation time of the moving part. According to the life detection method, life detection of the whole electric vibration system can be realized by evaluating the life of the moving part, the method is simple, and the life detection efficiency of the electric vibration system can be improved.