4192 results about "Magnetic circuit" patented technology

The invention discloses a sound production device and a sound production module, and relates to the technical field of electroacoustic transduction. The inner side of an inner folding ring of a first vibrating diaphragm assembly of the sound production device is connected with a magnetic circuit system, the outer periphery of an outer folding ring is connected with a shell, and a voice coil is connected with a first vibrating plate; the diaphragm and the second diaphragm assembly are sequentially arranged on the side, facing the voice coil, of the first diaphragm assembly and located on the outer side of the voice coil, the diaphragm is a flexible piece, the outer edges of the diaphragm and the second diaphragm assembly are both connected with the shell, and the inner edge of the diaphragm and the inner edge of the second diaphragm assembly are both connected with the first vibrating plate. A sound production cavity communicated with the sound outlet hole is formed between the diaphragm and the second vibrating diaphragm assembly; wherein a first rear cavity is defined between the first vibrating diaphragm assembly and the diaphragm, a second rear cavity is defined among the first vibrating diaphragm assembly, the second vibrating diaphragm assembly, the shell and the magnetic circuit system, and the first rear cavity is communicated with the second rear cavity. According to the sound production device, the effective vibration area of the vibration system is increased, and the acoustic performance is improved.

The utility model discloses a sound production device and a sound production module, the sound production device comprises a shell, a magnetic circuit system and a vibration system, and the shell is provided with a first sound outlet hole; the vibration system comprises a first vibrating diaphragm, a second vibrating diaphragm, a middle diaphragm and a voice coil, the first vibrating diaphragm is arranged on one side, far away from the magnetic circuit system, of the shell, the second vibrating diaphragm is arranged on one side, facing the magnetic circuit system, of the first vibrating diaphragm, and the middle diaphragm is arranged between the first vibrating diaphragm and the second vibrating diaphragm; the voice coil is at least partially arranged in the magnetic gap of the magnetic circuit system, and the middle diaphragm and the second diaphragm are located outside the voice coil; the outer edges of the second vibrating diaphragm and the middle diaphragm are connected with the shell, and the inner edges of the second vibrating diaphragm and the middle diaphragm are connected with the first vibrating plate of the first vibrating diaphragm; a second sound production cavity communicated with the first sound production hole is formed between the second vibrating diaphragm and the middle diaphragm; a first rear cavity is defined by the first vibrating diaphragm and the middle diaphragm, and a second rear cavity communicated with the first rear cavity is defined by the first vibrating diaphragm, the second vibrating diaphragm and the shell.

The utility model discloses a sound production device and a sound production module, the sound production device comprises a shell, a magnetic circuit system and a vibration system, and the shell is provided with an accommodating space; the magnetic circuit system is arranged in the accommodating space, the magnetic circuit system comprises a magnet yoke, an inner magnetic part and an edge magnetic part, the inner magnetic part and the edge magnetic part are arranged on the magnet yoke, the edge magnetic part is located on the outer side of the inner magnetic part, a magnetic gap is formed between the inner magnetic part and the edge magnetic part, and the edge magnetic part is provided with a notch; the vibration system comprises a voice coil, at least part of the voice coil is arranged in the magnetic gap, the voice coil is provided with a first protruding part formed by extending into the notch of the side magnetic part, the inner magnetic part is provided with a second protruding part, and the second protruding part and the first protruding part are correspondingly arranged.

The utility model discloses a sound production device, a sound production module and electronic equipment, the sound production device comprises a shell, a magnetic circuit system and a vibration system, the shell is provided with an accommodating space, and the shell is provided with a first sound outlet hole; the magnetic circuit system is arranged in the accommodating space and is provided with a magnetic gap; the vibration system comprises a first vibrating diaphragm, a second vibrating diaphragm, a middle diaphragm and a voice coil, the first vibrating diaphragm is arranged on one side, far away from the magnetic circuit system, of the shell, the second vibrating diaphragm is arranged on one side, facing the magnetic circuit system, of the first vibrating diaphragm, and the middle diaphragm is arranged between the first vibrating diaphragm and the second vibrating diaphragm; the voice coil is at least partially arranged in the magnetic gap, the voice coil is connected with the first diaphragm, and the second diaphragm and the middle diaphragm are located on the outer side of the voice coil; the outer edges of the second vibrating diaphragm and the middle diaphragm are connected with the shell, and the inner edges of the second vibrating diaphragm and the middle diaphragm are connected with the first vibrating diaphragm; and a closed second sound production cavity is formed between the second vibrating diaphragm and the middle diaphragm and is communicated with the first sound outlet hole.

The invention discloses a sound production device and electronic equipment, and relates to the technical field of electroacoustic transduction, a vibrating diaphragm assembly of the sound production device comprises a first vibrating diaphragm, a second vibrating diaphragm and a vibrating plate, the first vibrating diaphragm and the second vibrating diaphragm are arranged at an interval along a first direction and are respectively connected with two ends of a voice coil along the first direction, and the vibrating plate is located at the inner side of the voice coil and is connected with the first direction. The vibrating plate has magnetic conductivity, an edge magnetic part of the magnetic circuit system is arranged between the first vibrating diaphragm and the second vibrating diaphragm and is located on the outer side of the voice coil, two center magnets of a center magnetic part are located on the two opposite sides of the vibrating plate, the two center magnets are magnetized in the first direction, and the magnetizing directions are opposite; the sounding device forms a first cavity and a second cavity on two sides of the vibrating plate, and is provided with a first sounding hole and a second sounding hole which are respectively communicated with the first cavity and the second cavity, and the two central magnets are respectively exposed in the first cavity and the second cavity. According to the sound production device, the BL value is effectively increased, the acoustic performance is improved, and the sound leakage problem of a far field can be reduced.

The invention discloses a sound production device and electronic equipment, and relates to the technical field of electroacoustic transduction, a magnetic circuit system of the sound production device comprises a magnetic conductive yoke, and side magnetic parts, a common magnetic part and two central magnetic parts which are arranged on the magnetic conductive yoke, the side magnetic parts are annularly arranged to form an accommodating space, the common magnetic part is located in the accommodating space and is connected with the side magnetic parts, and the two central magnetic parts are arranged in the accommodating space. The magnetic circuit system is arranged in the containing space to divide the containing space into two installation spaces, each center magnetic part is located in one installation space, the center magnetic parts, the side magnetic parts and the common magnetic part are spaced to define a magnetic gap, the vibration system comprises a vibrating diaphragm assembly and two voice coils, the periphery of the vibrating diaphragm assembly is connected to the shell and is opposite to the magnetic circuit system, and the two voice coils are arranged side by side. One end of each voice coil is connected to the diaphragm assembly, and the other end of each voice coil is suspended in one magnetic gap. According to the sound production device, the size of the voice coil and the magnet volume of the magnetic circuit system are increased, so that the BL value is improved, and the whole machine performance and the sound effect loudness are improved.

The invention discloses a sound production device, a sound production module and electronic equipment, and relates to the technical field of electroacoustic transduction, a vibration plate of a vibration system of the sound production device comprises a first plate part and a second plate part which are located on different horizontal planes, the top of a voice coil is connected with the first plate part, and the second plate part is located on the inner side of the voice coil; a center magnetic part of the magnetic circuit system comprises a first center magnet and a second center magnet which are located on the two opposite sides of the second plate part, the first center magnet is close to the top of the voice coil, and the second center magnet is close to the bottom of the voice coil. The first center magnet and the second center magnet are magnetized in the first direction and are opposite in magnetizing direction, and the magnetic energy product of the first center magnet is larger than that of the second center magnet. According to the sound production device, the thinning design can be realized, the BL value is effectively improved, the magnetic lines are distributed more uniformly, the BLx curve is flatter, and thus the distortion is reduced.

The present invention provides a coaxial speaker including a fixing member, a magnetic circuit system, a voice coil, a first vibration system connected with the voice coil, and a second vibration system connected with the voice coil and arranged surrounding the first vibration system. The second vibration system locates coaxially with the first vibration system. The first vibration system includes a first diaphragm and a first support connecting the first diaphragm and the voice coil. The second vibration system includes a second diaphragm and a second support connecting the second diaphragm and the voice coil. The first diaphragm is used for generating treble sound. The second diaphragm is used for generating bass sound. Bass sound and treble sound form a full-range speaker, providing high-quality sound. Moreover, the assembly process is simplified by sharing voice coil, which improves assembly efficiency and reduces costs.

Disclosed in the present invention are a sound production apparatus, a sound production module, and an electronic device. The sound production apparatus comprises a magnetic circuit system, a conductive support, and a vibration system; the magnetic circuit system is provided with a magnetic gap and a mounting hole; the conductive support is provided in the mounting hole; the vibration system comprises a diaphragm assembly, a voice coil, and centering supports; the diaphragm assembly comprises a diaphragm, a frame, and a dome opposite to the magnetic circuit system; an inner annular hole is formed in the center of the diaphragm; the frame is provided in the inner annular hole and is connected to the diaphragm; the frame is provided with an assembling hole corresponding to the conductive support; the dome covers the assembling hole; one end of the voice coil is connected to the diaphragm or the frame, and the other end of the voice coil is suspended in the magnetic gap; and one end of each centering support is connected to the conductive support, and the other end of the centering support is connected to the frame and electrically connected to a lead of the voice coil. The sound production apparatus of the present invention has low magnetic flux leakage, and the sound production apparatus effectively improves the magnetic field strength and increases the BL value, thereby improving acoustic performance.

The invention discloses a sound production device and a sound production module, and relates to the technical field of electroacoustic transduction, a central magnetic part of a magnetic circuit system of the sound production device comprises a first central magnet, a central magnetic conductive plate and a second central magnet which are stacked, and the magnetizing directions of the first central magnet and the second central magnet are opposite; a receding space is formed between every two adjacent side magnetic parts, the inner side of an inner folding ring of a first vibrating diaphragm assembly of the vibrating system is connected with the center magnetic part, a diaphragm and a second vibrating diaphragm assembly are sequentially arranged on the side, facing the magnetic conductive yoke, of the first vibrating diaphragm assembly, and a sound production cavity communicated with a sound production hole of the shell is formed between the diaphragm and the second vibrating diaphragm assembly. The first extension part of the second diaphragm assembly is correspondingly connected with the second extension part of the diaphragm and extends to the avoiding space, the rigid connecting piece is arranged in the avoiding space, the rigid connecting part of the rigid connecting piece is connected with the first extension part, and the fourth extension part of the rigid connecting piece is connected with the voice coil. According to the sound production device, the effective vibration area of the vibration system is increased, and the acoustic performance is improved.

The invention discloses a heat dissipation driver and electronic equipment, and relates to the technical field of electronic equipment heat dissipation, the heat dissipation driver comprises a frame, a magnetic circuit system, a vibration system and a flow adjusting assembly, the vibration system comprises a vibrating diaphragm and a coil, the coil is located in a magnetic field of the magnetic circuit system, and the outer edge of the vibrating diaphragm is connected with the frame; the vibrating diaphragm, the magnetic circuit system and the frame define a rear cavity, and the vibrating diaphragm is provided with a communication hole communicated with the rear cavity. When the vibrating diaphragm vibrates in the direction close to the magnetic circuit system, the flow adjusting assembly is in an open state, and the flow adjusting assembly is exposed out of the communicating hole so that airflow in the rear cavity can flow out of the rear cavity through the communicating hole. When the vibrating diaphragm vibrates in the direction away from the magnetic circuit system, the flow adjusting assembly is in a closed state, and the flow adjusting assembly blocks the communicating hole, so that airflow in a heat source area of the equipment flows into the rear cavity, and heat dissipation of the equipment is achieved.

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 sound production device and electronic equipment, and relates to the technical field of electroacoustic transduction, a first magnetic gap is formed between an edge magnetic part of a magnetic circuit system of the sound production device and a magnetic conductive yoke, a second magnetic gap is formed between a central magnetic part and the magnetic conductive yoke, a support member is arranged on one side of the magnetic conductive yoke back to the central magnetic part, and the support member and the magnetic conductive yoke enclose to form an airflow cavity; the magnetic conductive yoke is provided with a first through hole communicated with the second magnetic gap and the airflow cavity, the supporting piece is provided with a second through hole communicated with the airflow cavity, a first vibrating diaphragm and a second vibrating diaphragm of the vibrating system are located on the two opposite sides of the magnetic circuit system, and the first vibrating diaphragm is provided with a third through hole communicated with the second through hole. The first voice coil and the second voice coil are arranged in the first magnetic gap and the second magnetic gap respectively, and sound waves of the first side of the second vibrating diaphragm and sound waves of the first side of the first vibrating diaphragm are radiated outwards on the same side of the sound production device together. According to the sound production device, the high-frequency performance is improved, and the vibration area of the vibration system is increased, so that the performance and the effect of the whole machine are improved.

The utility model discloses a sound production device and a sound production module, the sound production device comprises a shell, a magnetic circuit system and a vibration system, the shell is provided with a first sound outlet hole, and the shell comprises a first shell and a second shell; the magnetic circuit system is fixed on the second shell and is provided with a magnetic gap; the vibration system comprises a first vibrating diaphragm, a second vibrating diaphragm, a middle diaphragm and a voice coil, the first vibrating diaphragm is arranged on one side, far away from the magnetic circuit system, of the shell, and the outer edge of the first vibrating diaphragm is fixed on the first shell; the second vibrating diaphragm is arranged on one side, facing the magnetic circuit system, of the first vibrating diaphragm, and the outer edge of the second vibrating diaphragm is clamped between the first shell and the second shell; the middle diaphragm is arranged between the first vibrating diaphragm and the second vibrating diaphragm, and the outer edge of the middle diaphragm is connected with the first shell; the voice coil is at least partially arranged in the magnetic gap; the inner edges of the second vibrating diaphragm and the middle diaphragm are connected with the first vibrating diaphragm; and a closed second sound production cavity is formed between the second vibrating diaphragm and the middle diaphragm and is communicated with the first sound outlet hole.

The present invention relates to the technical field of electroacoustic transduction. Disclosed in the present invention are a sound production unit and an electronic device. The sound production unit comprises a housing and a magnetic circuit system, which is arranged in the housing and comprises a magnetically conductive yoke, a central magnetic portion and a side magnetic portion, wherein the central magnetic portion and the side magnetic portion are arranged on the magnetically conductive yoke, and the side magnetic portion is arranged on an outer side of the central magnetic portion; the central magnetic portion comprises central magnetic steel and a central magnetically conductive plate, with two opposite sides of the central magnetic steel being respectively connected to the central magnetically conductive plate and the magnetically conductive yoke; the side magnetic portion comprises side magnetic steel and a side magnetically conductive plate, with two opposite sides of the side magnetic steel being respectively connected to the side magnetically conductive plate and the magnetically conductive yoke; the central magnetically conductive plate and / or the side magnetically conductive plate are / is made of a cobalt alloy material; and the magnetically conductive yoke is also made of a cobalt alloy material. A thinned design of the sound production unit of the present invention is realized, and the magnetic induction intensity of the magnetic circuit system is also effectively improved, thereby increasing the BL value, and thus the acoustic performance requirement of the sound production unit can be met.

Provided is a speaker device, including a first frame, a first vibration system, a magnetic circuit system, a second frame, a second vibration system, a second voice coil, and a conductive member electrically connected to the second voice coil. The magnetic circuit system includes a lower splint, a first main magnetic steel, a first sub-magnetic steel, a pole core, a second main magnetic steel, and a second sub-magnetic steel. A magnetization direction of the first sub-magnetic steel is the same as that of the second sub-magnetic steel, a magnetization direction of the first main magnetic steel is the same as that of the second main magnetic steel, and the magnetization direction of the second main magnetic steel is opposite to that of the second sub-magnetic steel. Compared with the related art, the speaker device of the present invention has good acoustic performance.

Disclosed in the present invention are a sound production apparatus and a terminal device. The sound production apparatus comprises a housing, a vibration system, and a magnetic circuit system; in the vibration system, a first vibration assembly comprises a first diaphragm assembly and a first voice coil connected to the first diaphragm assembly, and a second vibration assembly comprises a second diaphragm assembly and a second voice coil connected to the second diaphragm assembly; the first diaphragm assembly and the second diaphragm assembly are respectively connected to two ends of the housing and cover openings, the first voice coil is a rectangular voice coil, and the second voice coil is a racetrack-shaped voice coil; the magnetic circuit system is arranged in an accommodating cavity of the housing, and the magnetic circuit system is provided with a first magnetic gap and a second magnetic gap; the second magnetic gap is arranged around the first magnetic gap, and at least part of the first magnetic gap is communicated with the second magnetic gap; and one end of the first voice coil is suspended in the first magnetic gap, and one end of the second voice coil is suspended in the second magnetic gap. The sound production apparatus of the present invention can reduce the height and weight in the Z direction, thereby reducing the housing vibration caused by the vibration system.

The invention provides a rotor iron core, a permanent magnet motor and an inverter compressor, and relates to the technical field of motor and compressor design and manufacture, the rotor iron core comprises uniformly distributed permanent magnet grooves, a groove is arranged between two adjacent permanent magnet grooves, each groove extends inwards along the radial direction of the rotor iron core, parallel magnetic bridges are arranged between the grooves and the permanent magnet grooves, and the permanent magnet grooves are connected with the parallel magnetic bridges. A first magnetic barrier groove, a second magnetic barrier groove and a third magnetic barrier groove which are symmetrically distributed are formed in the two sides of the top of each permanent magnet groove respectively, a first arc and a second arc are arranged on the outer side of the rotor core above the magnetic barrier grooves, the second arc intersects with the side edge of the groove, and permanent magnets with alternating magnetism are embedded in the permanent magnet grooves. The radius Rr of the outer side of the rotor iron core, the distance ho from the middle point of the bottom of the permanent magnet groove to the center point of the rotor iron core and the thickness hm of the permanent magnet meet the condition that (Rr-ho) / hm is larger than 2 and smaller than or equal to 3.4. By reasonably arranging the position and the size of the magnetic barrier groove, magnetic circuit distribution can be changed, magnetic flux leakage can be reduced, the power density of the motor can be increased, and electromagnetic vibration noise of the motor and the compressor can be reduced.

The invention discloses a sound production device and electronic equipment, and relates to the technical field of electroacoustic transduction, a vibrating diaphragm assembly of a vibrating system of the sound production device comprises a first vibrating diaphragm, a second vibrating diaphragm and a vibrating plate, the first vibrating diaphragm and the second vibrating diaphragm are arranged at an interval along a first direction and are respectively connected with two ends of a voice coil along the first direction, and the vibrating plate is located at the inner side of the voice coil and is connected with the first direction. An edge magnetic part of the magnetic circuit system is arranged between the first vibrating diaphragm and the second vibrating diaphragm and located on the outer side of the voice coil, two center magnets of a center magnetic part are located on the two sides of the vibrating plate in the first direction, the two center magnets are magnetized in the first direction, and the magnetizing directions are opposite; the sounding device forms a first cavity and a second cavity on two sides of the vibrating plate, and is provided with a first sounding hole and a second sounding hole which are respectively communicated with the first cavity and the second cavity, and the two central magnets are respectively exposed in the first cavity and the second cavity. According to the sound production device, the BL value is effectively increased, the acoustic performance is improved, and the sound leakage problem of a far field can be reduced.

The invention discloses a design method of a coreless stator axial magnetic flux permanent magnet motor. The method specifically comprises the following steps: firstly, determining a basic structure, a permanent magnet structure and performance demand parameters of the coreless stator axial magnetic flux permanent magnet motor; determining stator and rotor structure parameters of the motor according to the performance requirement parameters of the motor; establishing a simplified model of an internal magnetic circuit of the motor, determining excitation magnetic potential of the motor, and establishing a finite element dynamic simulation model of the coreless stator axial flux permanent magnet motor based on a Maxwell equation; and finally, comparing the finite element dynamic simulation result with the motor performance demand parameter, if the finite element dynamic simulation result does not meet the requirement, correcting the motor design structure parameter and the electromagnetic parameter, and re-determining the stator and rotor structure parameter of the motor until the finite element dynamic simulation result of the motor meets the motor performance demand parameter. The design cost of the coreless stator axial magnetic flux permanent magnet motor is reduced, the design period is shortened, and the design efficiency and the design precision are improved.

Disclosed in the present invention are a sound-producing device, a sound-producing module and an electronic device. The sound-producing device comprises a magnetic circuit system, an electrically conductive bracket and a vibration system, wherein the magnetic circuit system is configured to be square, and the magnetic circuit system comprises a magnetically conductive yoke, and a central magnetic portion and a side magnetic portion, which are arranged on the magnetically conductive yoke; the side magnetic portion is located on the outer side of the central magnetic portion, and the side magnetic portion and the central magnetic portion enclose a magnetic gap; the magnetic circuit system is provided with a mounting hole penetrating the magnetically conductive yoke and the central magnetic portion; the electrically conductive bracket is arranged in the mounting hole; the vibration system comprises a diaphragm assembly opposite the magnetic circuit system, a voice coil and a spider; one end of the voice coil is connected to the diaphragm assembly, and the other end of the voice coil is suspended in the magnetic gap; and one end of the spider is electrically connected to a bonding pad of the electrically conductive bracket, and the other end of the spider is connected to the diaphragm assembly and is electrically connected to a lead wire of the voice coil. The present invention aims to provide the sound-producing device, the size of a magnetic circuit of which is effectively increased. By means of the sound-producing device, the magnetic field intensity is effectively increased, and a BL value is also increased, thereby improving the acoustic performance.

The present invention provides a speaker includes a frame, a vibration system fixed with the frame, a magnetic circuit system driving the vibration system to vibrate and sound, a flexible circuit board and an electrical connector. The vibration system includes a diaphragm and a voice coil driving the diaphragm to vibrate. The flexible circuit board is fixed on a side of the diaphragm distal to the voice coil. The flexible circuit board covers and is fixed with the diaphragm. The electrical connector passes through the diaphragm to electrically connect the flexible circuit board and the voice coil. In present invention, the flexible circuit board does not occupy a space of the magnetic circuit system, and the acoustic performance of the speaker is good.

The invention discloses a sound production device, a sound production module and electronic equipment, and relates to the technical field of electroacoustic transduction, a vibration plate of a vibration system of the sound production device comprises a first plate part, a second plate part and a third plate part which are integrally arranged, the first plate part and the second plate part are located on different horizontal planes, the top of a voice coil is connected with the first plate part, and the top of the voice coil is connected with the third plate part. The third plate part is connected with the inner circumferential wall of the voice coil in an attached mode, the two ends, in the first direction, of the third plate part are connected with the first plate part and the second plate part respectively, and a center magnetic part of the magnetic circuit system comprises a first center magnet and a second center magnet which are located on the two opposite sides of the second plate part. The sides, facing the vibrating diaphragm assembly, of the first center magnet and the second center magnet are both exposed in the inner cavity of the sound production device, and the first center magnet and the second center magnet are magnetized in the first direction and are opposite in magnetizing direction. According to the sound production device, the thinning design can be realized, the BL value is effectively improved, the magnetic lines are distributed more uniformly, the BLx curve is flatter, and thus the distortion is reduced.

The invention relates to the field of servo motor parameter optimization, in particular to a magnetic field simulation and parameter optimization method and system for a permanent magnet servo motor rotor. The method comprises the following steps: acquiring a rotor global magnetic field monitoring curve in the operation process of a servo motor rotor, and constructing a global magnetic field accurate compensation model; performing regional magnetic circuit structure analysis on the global magnetic field accurate compensation model, performing dynamic magnetic field logic mapping modeling, and constructing a real-time regional magnetic field logic map; performing magnetic field state change analysis on the global magnetic field accurate compensation model, performing multi-node change track correlation analysis, and constructing a multi-node magnetic field coupling dependency network; and performing short-term magnetic field evolution prediction based on the multi-node magnetic field coupling dependency network, and performing comprehensive electromagnetic performance evaluation to obtain an electromagnetic performance evaluation report. According to the method, the sudden change of the magnetic field is accurately and quickly identified, so that the magnetic field parameters are iteratively adjusted and optimized, and the service life and the performance of the servo motor are improved.

The invention provides a sound production monomer and electronic equipment. The sound production monomer comprises a bracket, a magnetic circuit system and a vibration system, the magnetic circuit system comprises a central magnetic circuit, a middle magnetic circuit, a side magnetic circuit, a first magnetic conductive plate and a second magnetic conductive plate, a first magnetic gap and a second magnetic gap are respectively formed between the middle magnetic circuit and the side magnetic circuit as well as between the middle magnetic circuit and the central magnetic circuit, and a first through hole is formed in the first magnetic conductive plate; airflow channels are formed between the central magnetic circuit and the first magnetic conductive plate as well as between the middle magnetic circuit and the second magnetic conductive plate; the vibration system comprises a first vibrating diaphragm and a second vibrating diaphragm; the first vibrating diaphragm comprises a first folding ring, the first folding ring is provided with a second through hole communicated with the first through hole, sound waves of the second vibrating diaphragm radiate outwards through the first through hole and the second through hole, and the sound waves of the first vibrating diaphragm and the second vibrating diaphragm radiate outwards on the same side of the sound production single body. According to the invention, the problem that the vibration area and the vibration displacement of the existing sound production monomer cannot meet the requirements of wearable audio products such as OWS earphones can be solved.

Disclosed in the present invention are a sound production device, a sound production module, and an electronic apparatus. The sound production device comprises a magnetic circuit system, an electrically conductive support and a vibration system, wherein the magnetic circuit system comprises a magnetically conductive yoke, and a central magnetic part and an edge magnetic part arranged on the magnetically conductive yoke, the edge magnetic part and the central magnetic part enclosing a magnetic gap; the magnetic circuit system is provided with a mounting hole running through the magnetically conductive yoke and the central magnetic part, the electrically conductive support being arranged in the mounting hole, and the electrically conductive support being provided with a first welding surface; and the vibration system comprises a diaphragm assembly, a voice coil and a spider which are opposite the magnetic circuit system, one end of the voice coil being connected to the diaphragm assembly, and the other end of the voice coil being suspended in the magnetic gap, one end of the spider being electrically connected to the first welding surface, and the other end of the spider being connected to the diaphragm assembly and electrically connected to a lead-out wire of the voice coil. The first welding surface is not higher than the side surface of the central magnetic part facing the diaphragm assembly. The sound production device of the present invention has low magnetic leakage, so that the magnetic field intensity can be effectively improved, thus increasing the BL value, improving the acoustic performance.

A magnetic component and a switch power supply device are disclosed. The magnetic component includes a magnetic core and at least three windings, the magnetic core including at least three winding columns, at least one side columns, a first cover plate and a second cover plate opposite to each other, wherein the at least three winding columns are sequentially arranged in adjacent, the first cover plate and the second cover plate are respectively at upper parts or lower parts of the at least three winding columns and the at least one side column to form a closed magnetic flux loop; the at least three windings are wound on the at least three winding columns, respectively; wherein magnetic flux direction of the middle winding column in adjacent three winding columns is opposite to magnetic fluxes direction of the other two winding columns in adjacent three winding columns.

The invention provides a vibration sounding device which comprises a shell which comprises a top wall, a bottom wall and a side wall, and the top wall is provided with a sounding hole penetrating through the top wall; the sound production single body comprises a basin frame, and a magnetic circuit system and a vibrating diaphragm which are respectively fixed on the basin frame, and the vibrating diaphragm comprises a first sound production part and a second sound production part which are arranged side by side; the sound production monomer further comprises a first voice coil and a second voice coil. The elastic supporting piece is used for elastically suspending the sound production single body in the shell; the elastic sealing ring is arranged around the sound outlet hole; and the stator is a driving coil which is arranged at the first magnetic gap and / or the second magnetic gap and is used for driving the sound production monomer to vibrate. According to the vibration sound production device, a receiver, a loudspeaker and a motor can be integrated, the size is small, private conversation can be achieved in function, meanwhile, the sound production front cavity and the sound production rear cavity of the sound production single body can be blocked, and the effects of preventing water and dust and providing damping are achieved.

The invention discloses a sound production device, a sound production module and electronic equipment, and relates to the technical field of electroacoustic transduction, a vibration plate of a vibration system of the sound production device comprises a first plate part and a second plate part which are located on different horizontal planes, the top of a voice coil is connected with the first plate part, and the second plate part is located on the inner side of the voice coil; a central magnetic part of the magnetic circuit system comprises a first central magnet and a second central magnet which are located on the two opposite sides of the second plate part, the first central magnet and the second central magnet are magnetized in the first direction, and the magnetizing directions of the first central magnet and the second central magnet are opposite. The side, opposite to the vibrating diaphragm assembly, of the first center magnet is connected with the first magnet yoke, the side, opposite to the vibrating diaphragm assembly, of the second center magnet and the edge magnetic part are connected with the second magnet yoke, and the peripheral edges of the first magnet yoke and the second magnet yoke are connected in a welded mode. According to the sound production device, the thinning design can be realized, the BL value is effectively improved, the magnetic lines are distributed more uniformly, the BLx curve is flatter, and thus the distortion is reduced.

The invention belongs to the technical field of magnetic levitation rulers, and relates to a magnetic levitation ruler horizontal motion control method, which comprises the following steps: establishing a mathematical model of a horizontal system; according to the constructed mathematical model, estimating the position of the rotor iron core through induced electromotive force derivation to obtain the horizontal position and the deflection angle value of the rotor iron core; rotor iron core horizontal motion control based on SYSTD is carried out; and setting the parameters of the horizontal control system of the magnetic suspension ruler system. A mathematical model is established based on a magnetic circuit and a dynamics principle, the problems of nonlinearity and strong coupling of a magnetic levitation ruler horizontal displacement system are solved by applying an improved active-disturbance-rejection control algorithm, and a system structure is simplified by utilizing a position-sensorless control technology. According to the method, unknown dynamic and external disturbance is taken as total disturbance, and real-time estimation and compensation are carried out through an extended state observer; the ADRC not only can adjust errors, but also can actively process uncertain factors of the system and improve the control efficiency, does not depend on an accurate mathematical model, and is high in adaptability and robustness in a complex system.