1643 results about "Magnetic circuit" patented technology

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 magneto-rheological self-adaptive locking clamp for turning and a machining method of the magneto-rheological self-adaptive locking clamp, and belongs to the technical field of precision workpiece machining equipment. Comprising a flexible contact shell making contact with a workpiece, a locking unit arranged at the outer end of the flexible contact shell and an outer shell arranged outside the locking unit. The locking unit comprises an axial locking assembly and a radial pushing assembly, and the axial locking assembly is a self-adaptive locking assembly with an integrated magnetic circuit; the radial pushing assembly is a rigid pushing assembly. By means of the clamp, high-precision, lossless and self-adaptive locking of workpieces is achieved, and clamping deformation of thin-wall and special-shaped workpieces is effectively restrained. Through a composite mechanism of magneto-rheological locking and mechanical rigid pushing, the dynamic stability of the machining process is remarkably enhanced, meanwhile, it is ensured that the locking force is quick in response, low in energy consumption and stable in long-term work, and the machining quality and efficiency and the reliability of the clamp are improved.

The utility model discloses a double-sided sound production loudspeaker, which comprises a shell, a magnetic circuit system and a vibration unit, the magnetic circuit system comprises a magnetic conductive seat connected with the shell, the magnetic conductive seat comprises a main magnetic plate and side magnetic plates, the side magnetic plates are respectively arranged on two sides of the main magnetic plate along a first direction at intervals, the main magnetic plate is provided with a main magnetic unit, and the main magnetic unit is provided with a plurality of vibration units. An edge magnetic unit is arranged on the edge magnetic plate; the vibrating unit comprises vibrating diaphragms and voice coils, the two vibrating diaphragms are arranged on the shell in a spaced mode in the second direction, the voice coils are arranged on the two vibrating diaphragms, and the voice coils are located between the main magnetic unit and the side magnetic units. According to the double-sided sounding loudspeaker, the two sides of the magnetic circuit system are respectively provided with one vibration unit, so that the two voice coils can form two independent magnetic fields through the main magnetic unit and the side magnetic units respectively, double-sided sounding is realized, the two magnetic fields share one magnetic conductive seat, the space occupied by the magnetic circuit system along the first direction is reduced, and the space occupied by the magnetic circuit system along the second direction is reduced. And the miniaturization and thinning development of the double-sided sounding loudspeaker is facilitated.

The present application provides a sound production apparatus and an electronic device. The sound production apparatus comprises a housing, a magnetic circuit assembly, a vibration assembly, and a spider. The magnetic circuit assembly has a first magnetic gap and a second magnetic gap. The vibration assembly comprises a diaphragm component and a voice coil component. The voice coil component comprises a first voice coil disposed corresponding to the first magnetic gap and a second voice coil disposed corresponding to the second magnetic gap. The spider is electrically connected to the voice coil component and an external circuit. The spider comprises a connection arm, a bent arm, and a vibration arm connected in sequence. The connection arm is disposed on the diaphragm component and is electrically connected to the first voice coil and the second voice coil. The vibration arm extends in a bent shape. The bent arm is connected between the connection arm and the vibration arm, and the bent arm extends from an inner end of the vibration arm along a vibration direction of the vibration assembly and is connected to the connection arm. This configuration improves the magnetic field strength of the magnetic circuit assembly, thereby increasing the BL value of the sound production apparatus and ensuring the acoustic performance of the sound production apparatus.

The invention discloses a novel permanent magnetic mechanism suitable for a permanent magnetic circuit breaker and a ring main unit, which is characterized in that a static iron core and a movable iron core are oppositely arranged in an aluminum alloy shell along the axial direction, an internal pull rod penetrates through the axis of the aluminum alloy shell, and the internal pull rod movably penetrates through the static iron core and is connected with the movable iron core; a shaft fixing ring is movably arranged on an inner pull rod of the aluminum alloy shell, the shaft fixing ring movably abuts against the side, away from the static iron core, of the movable iron core, and the two sides of the shaft fixing ring are axially limited through a locking nut and a total stroke adjusting nut which are connected to the inner pull rod in a threaded mode. The mechanism is provided with a total stroke adjusting mechanism, an overtravel adjusting mechanism and a switching-on and switching-off speed adjusting mechanism, respective adjustment is achieved through special nuts, the problem of synchronous change of the opening distance and the overtravel of a traditional mechanism is solved, an aluminum alloy shell and a closed magnetic circuit are adopted, magnetic leakage is reduced, the magnetic field utilization rate and the impact resistance are improved, and spring pre-tightening force is changed through spring adjusting nuts; the switch-on and switch-off speed is accurately controlled, various loads are adapted, and the breaking risk is reduced.

The present invention relates to the technical field of electroacoustic conversion and provides a speaker, the speaker of the present invention connects a magnetic yoke and a basin frame through an elastic connection member to support a magnetic circuit system in vibration, a diaphragm, the magnetic yoke, the basin frame, and an elastic connection member together form a sealed back cavity. The vibration directions of the magnetic circuit system and the vibration system are in opposite directions. An upper housing and a lower housing are respectively fixed to the opposite sides of the basin frame, the upper housing, the diaphragm, and the basin frame together form a first front cavity for sound output, and the lower housing, the magnetic yoke, and the basin frame together form a second front cavity for sound output, so as to realize dual-sided sound output from the speaker.

The invention provides a method and equipment for calculating hysteresis loss of an axial electromagnetic bearing, and belongs to the technical field of hysteresis loss calculation. The method comprises the following steps: establishing an equivalent magnetic circuit model; under the condition of axial vibration of the thrust disc, magnetomotive force is calculated, and total dynamic magnetic flux is determined through an equivalent magnetic circuit model; establishing a quantitative relationship between any two of the maximum magnetic flux density amplitude, the magnetic hysteresis loss and the angle parameter representing the magnetic hysteresis effect; taking magnetomotive force as magnetic field excitation, taking total dynamic magnetic flux as magnetic field response, and constructing complex permeability based on a quantitative relation; updating the equivalent magnetic circuit model by using the complex permeability; solving the maximum magnetic flux density amplitude of each region of the iron core under the dynamic working condition through iterative calculation; calculating the hysteresis loss of each region based on the quantitative relation and the maximum magnetic flux density amplitude of each region; and the total magnetic hysteresis loss is calculated. Based on the method, the invention further provides calculation equipment for the hysteresis loss of the axial electromagnetic bearing. According to the method, the hysteresis loss of the axial electromagnetic bearing under the dynamic operation condition can be accurately calculated.

An electronic device includes a casing, a first sound-emitting device and a second sound-emitting device. The first sound-emitting device includes a basket, a vibration system and a magnetic circuit system. The vibration system includes a diaphragm and a voice coil. The magnetic circuit system includes a magnetic bowl, a magnetic unit and an auxiliary magnetic. The first sound-emitting device further includes an upper shell and a front cavity. The first sound-emitting device further includes a first elastic damping member. The diaphragm, the magnetic bowl, the basket and the first elastic damping member are sealed and enclosed to form a first rear cavity, and the first sound-emitting device, the second sound-emitting device and the casing are enclosed to form a second rear cavity. The sound-emitting device of the present invention with good vibration damping effect, high frequency response sensitivity and better acoustic performance.

The present invention provides a speaker including a first frame, a second frame, a first vibration system, a second vibration system, and a magnetic circuit system. The first vibration system includes a first diaphragm and a first voice coil. The second vibration system includes a second diaphragm and a second voice coil. The magnetic circuit system includes a first main magnet, first auxiliary magnets a second main magnet and second auxiliary magnets. A projection of the second voice coil along a vibration direction of the speaker is located in the first voice coil, and the projection of the first voice coil on the magnetic circuit system along the vibration direction of the speaker is located on the second auxiliary magnet. In present invention, the BL of the first voice coil is increased, the sensitivity of the speaker is improved, and the loudness becomes larger.

The invention belongs to the field of rotating machinery bearing engineering and magnetic circuit design, and discloses a bearing bush and magnetic circuit integrated structure with radial and axial composite vortex suppression slots. The partition magnetic conduction embedded blocks are embedded into the bearing bush body in an annular multi-sector array and are symmetrically arranged between the left end face and the right end face of the bearing bush body in the axial direction; the vortex suppression slits are arranged at equal intervals along the circumferential direction of the bearing bush body; the partition water paths are respectively arranged on the back sides of the partition magnetic guide embedded blocks; the compliant thin-wall area is a liquid film area arranged between the bearing bush body and the partitioned magnetic conduction insert block; the magnetic flux gathering windows are magnetic path areas with small magnetic resistance in the bearing bush body, and each partition magnetic conduction embedded block correspondingly forms one magnetic flux gathering window and is distributed in the bearing bush body on the back side of the partition magnetic conduction embedded block. The adjustable shielding sheet is parallel to the surface of the bearing bush body and arranged in the axial center area of the bearing bush body.

The invention provides a permanent magnet radial-axial collaborative balancing device and method for a shield pump, and belongs to the technical field of shield pumps. The device comprises a pump shell, an impeller, a rotor assembly, a stator assembly, a shaft, a thrust bearing, a rotor permanent magnet component and a static permanent magnet component, the rotor permanent magnet component and the static permanent magnet component correspond to each other, the rotor permanent magnet component is embedded below an impeller front cover plate opening ring, and the static permanent magnet component is embedded into the corresponding inner wall of the pump shell. The magnetization direction and the axis of the pump shaft form a preset inclination angle and are in mirror symmetry, so that a repulsive magnetic circuit with opposite same-name magnetic poles is formed; space magnetic force generated during working can be decomposed into radial and axial components. The radial component provides restoring force pointing to the center when the rotor deviates, and the radial stability is enhanced. The axial component counteracts the axial thrust of the fluid, and the thrust bearing load is reduced. External energy input is not needed, the structure is compact, vibration noise can be effectively restrained, and the service life of the bearing is prolonged.

The utility model discloses a sound production device and electronic equipment. The sound production device comprises a shell, a magnetic circuit system, a vibration system and a conductive piece, the magnetic circuit system is connected to the inner side of the shell; the vibration system comprises a first vibrating diaphragm and a second vibrating diaphragm which are respectively positioned on two opposite sides of the magnetic circuit system, and a first voice coil and a second voice coil which are respectively connected with the first vibrating diaphragm and the second vibrating diaphragm; the conductive part is arranged on the shell and provided with a first bonding pad, a second bonding pad and an outer conductive part, the first bonding pad and the second bonding pad are arranged in the first direction and are close to the first vibrating diaphragm and the second vibrating diaphragm respectively, the first direction is the vibration direction of the vibration system, and the second direction is the vibration direction of the vibration system; the first voice coil and the second voice coil are electrically connected with the first bonding pad and the second bonding pad respectively, and the outer conductive part is exposed out of the side surface of the shell and electrically connected with an external circuit. According to the sound production device provided by the invention, the number of the outer conductive parts outside the shell is reduced, the assembly space of the whole machine is saved, and the miniaturization design of a product is facilitated.

The invention relates to an anti-demagnetization bistable quick release for an elastic operation mechanism, which is characterized by comprising an anti-demagnetization double-magnet unit, an armature unit, a coil unit and a self-adaptive pulse control system, and is characterized in that the anti-demagnetization double-magnet unit comprises a main permanent magnet, an auxiliary permanent magnet, a magnetic conductive yoke and an iron core; the main permanent magnet, the auxiliary permanent magnet and the coil unit are all assembled and connected with the magnetic conductive yoke to form a magnetic circuit loop, and the main permanent magnet and the auxiliary permanent magnet are connected in parallel to play a role in demagnetization resistance. And the magnetic conductive yoke is provided with an air gap, and a magnetic field at the air gap is used for adsorbing the armature and realizing the tripping action. When the device is matched with the circuit breaker for use, the tripping speed, the operation stability and the opening action consistency of the circuit breaker can be improved.

The invention provides a composite groove type stator punching sheet and a motor formed thereof.The stator punching sheet comprises M composite grooves distributed in the circumferential direction of the stator punching sheet, each composite groove comprises a first winding groove and a second winding groove which are distributed along the two sides of the center line of the groove, and the first winding grooves and the second winding grooves are different in structure; the inner side wall of the first winding groove comprises at least one section of arc, and the inner side wall of the second winding groove does not comprise an arc and is only enclosed by straight lines; m is an integer greater than or equal to 3. The first winding slots effectively modulate an air-gap magnetic field by utilizing smooth arc-shaped contours of the first winding slots, so that cogging torque and torque pulsation caused by magnetic conductance change are greatly reduced; the second winding groove is used for enhancing the magnetic circuit capacity and ensuring that the main magnetic flux can pass through efficiently without saturation, so that the harmonic content and the stator iron loss are greatly reduced; the first winding groove and the second winding groove complement each other in the aspects of electromagnetic performance and process advantages and are synergistically enhanced, so that a high-performance and low-cost synergistic effect is realized.

A fixing device for a vehicle configured to connect the vehicle's cabin unit and loading unit of loading cargo at the rear of the cabin unit includes a coil transmitting an electromagnetic force to a drive pulley, an assembly module including a drive pulley and mechanically fixing the cabin unit and the loading unit together through a driving force of the drive pulley via the coil when the loading unit moves and aligns with the cabin unit, and a magnetic module enclosing the assembly module on an external side of the assembly module and magnetically fixing the cabin unit and the loading unit together by changing a magnetic circuit through a rotation force of a magnetic body while the cabin unit and the loading unit are mechanically connected to each other.

The invention relates to the technical field of electric variable data compensation, in particular to a metering error dynamic compensation method and system of an intelligent measuring switch. The method comprises the following steps: calculating to obtain phase delay compensation time of each sampling point based on original instantaneous current of each sampling point, equivalent excitation inductance of a current transformer, internal resistance of a secondary side winding, resistance value of a sampling resistor and a magnetic circuit saturation critical current value; performing high-order correction on the original instantaneous current to obtain a real current value of the sampling point; based on the original instantaneous voltage, the real current value and the phase delay compensation time of the sampling point in the metering period, the active power of the metering period is calculated so as to realize metering error dynamic compensation, and the accuracy of active power calculation of the intelligent measurement switch in the dynamic load switching process can be effectively improved.

The invention belongs to the technical field of motors, and discloses a rotor claw pole shaft radial hybrid excitation torque motor which comprises a radial magnetic field armature stator and a shaft radial magnetic field rotor. And a radial air gap is formed between the radial magnetic field armature stator and the radial magnetic field rotor. Wherein the axial-radial magnetic field rotor comprises two claw pole type rotor iron cores, a plurality of radial magnetic flux permanent magnets and axial magnetic flux permanent magnets. The two claw-pole type rotor iron cores are arranged in opposite directions, so that the claw-pole type rotor tooth parts are staggered with each other. The radial magnetic flux permanent magnets are sequentially inserted between the claw pole type rotor tooth parts, the magnetizing directions of the radial magnetic flux permanent magnets repel each other, and the axial magnetic flux permanent magnets are arranged between the two claw pole type rotor yoke parts. Through the action of the tangential permanent magnets and the axial permanent magnets on the claw pole rotor, cross coupling of magnetic circuits is realized, the air gap flux density is enhanced, the torque density and efficiency are improved, and the integration level and the space utilization rate of the motor are improved.

The invention discloses a sound production device and intelligent glasses, and relates to the technical field of electroacoustic transduction, a first vibration system of a first sound production unit of the sound production device comprises a first vibrating diaphragm assembly and a first voice coil, and a first magnetic circuit system comprises a first magnetic part and a second magnetic part which are arranged on two opposite sides of the first vibrating diaphragm assembly. The first magnetic part and the second magnetic part are respectively provided with a first magnetic gap and a second magnetic gap corresponding to the first voice coil, a second vibration system of the second sound production unit comprises a second vibrating diaphragm assembly and a second voice coil, and a second magnetic circuit system comprises a third magnetic part and a fourth magnetic part which are arranged on two opposite sides of the second vibrating diaphragm assembly. The third magnetic part and the fourth magnetic part are respectively provided with a third magnetic gap and a fourth magnetic gap corresponding to the second voice coil; a first concave edge is formed on the first magnetic part; and / or a second concave edge is formed on the fourth magnetic part. The sound production device provided by the invention has relatively low distortion, can reduce the sound leakage problem of a far field, has good acoustic performance, and is more compact in matching structure with the whole machine.

The method comprises the steps that an equivalent one-dimensional linear magnetic circuit model of an eddy current damper is constructed, and the equivalent one-dimensional linear magnetic circuit model is formed by connecting air gap magnetic resistance, magnetic conductive tube magnetic resistance, permanent magnet magnetic resistance and magnetomotive force provided by a permanent magnet in series; constructing an eddy current damping force calculation model, wherein the eddy current damping force calculation model is a relation model between the air gap magnetic flux density and the eddy current damping force and a relation model between the damping coefficient and the eddy current damping force; continuously adjusting configuration values of geometric parameters and material attribute parameters of the permanent magnet, the air gap and the magnetic conductive tube, and calculating a corresponding damping coefficient until an optimal damping coefficient is obtained; and configuring the eddy current damper according to the optimal configuration value of the parameter corresponding to the optimal damping coefficient, and arranging the damper on the power transmission tower steel tube structural member to realize vibration reduction. The method has the advantages of being simple in implementation method, low in cost, convenient to apply, good in damping effect and the like.

The present invention provides a speaker including a first frame, a second frame, a first vibration system, a second vibration system, and a magnetic circuit system. The first vibration system includes a first diaphragm and a first voice coil. The second vibration system includes a second diaphragm and a second voice coil. The magnetic circuit system includes a first main magnet, first auxiliary magnets, a second main magnet and second auxiliary magnets. A projection of the first voice coil along a vibration direction of the speaker is located out of the second voice coil, and the projection of the second voice coil along the vibration direction of the speaker is located on the first main magnet. In present invention, the BL of the second voice coil is increased, the sensitivity of the speaker is improved, and the loudness becomes larger.

The stator core structure comprises an iron core body and a mounting column, the iron core body is formed by laminating a plurality of first punching sheets, each first punching sheet is of a circular structure, the inner side of each first punching sheet is uniformly provided with a plurality of punching sheet grooves, and the outer side of each first punching sheet is provided with a flat edge. The flat edge forms a first welding plane, and the mounting column and the first welding plane are welded and fixed; the number of the flat edges is at least three. According to the utility model, the mounting columns are welded on the outer side of the iron core body, and a large gap is arranged between the iron core body and the mounting columns, so that enough refrigerants can pass through to cool the iron core body and an internal coil, and the performance of the motor is further ensured. The iron core body is formed by combining and laminating two punching sheets made of different materials, the main body adopts a silicon steel sheet, and stainless steel sheets are arranged at two ends, so that the strength of the iron core body is improved while the smoothness of a magnetic circuit of the motor is ensured, and magnetic leakage is effectively prevented.

The invention provides a current superposition switched reluctance motor magnetic flux leakage minimization design method, which comprises the steps of detecting air gap magnetic flux density distribution and a leakage magnetic flux path through a Hall sensor based on a set output performance target, determining an optimal magnetic circuit structure in combination with a current superposition principle, establishing an optimization model taking leakage magnetic flux minimization as a target, and calculating the magnetic flux leakage minimization of a switched reluctance motor. The optimal magnetic pole configuration and winding layout scheme is solved through a genetic algorithm under the conditions of motor structure parameters, material characteristics and current constraints, collaborative optimization is performed on multiple key parameters such as magnetic pole groove matching, winding turns and current, leakage magnetic flux minimization is achieved, and a dynamic feedback control strategy is utilized to achieve the optimal magnetic pole configuration and winding layout scheme. The current superposition proportion is adjusted in real time according to the rotor position, leakage flux fluctuation is inhibited, and efficient and stable operation of the motor is ensured.

Provided in the present invention are a sound production unit and an electronic device. The sound production unit comprise: a support; a magnetic circuit system connected to the support and having a first magnetic gap and a second magnetic gap; and a vibration system comprising a first vibration diaphragm and second vibration diaphragm connected to two sides of the support, and a first voice coil and second voice coil connected to the first vibration diaphragm and the second vibration diaphragm, the first voice coil and the second voice coil being respectively located in the first magnetic gap and the second magnetic gap. The first vibration diaphragm comprises a first corrugated rim, a second corrugated rim, and a vibration part, the vibration part being connected to the first voice coil, and the first corrugated rim being connected to the magnetic circuit system. A through hole is provided in the center of the magnetic circuit system, the first corrugated rim surrounding the through hole. Sound waves of the second vibration diaphragm radiate outwards by means of the through hole, and sound waves of the first vibration diaphragm and the second vibration diaphragm radiate outwards on the same side of the sound production unit. Using the present invention can solve the problem that the vibration area and vibration displacement of existing sound production units cannot meet the requirements of wearable audio products such as OWS earphones.

The invention relates to a method for calculating the power-on and power-off delay time performance of an electromagnetic valve, and the method comprises the following steps: obtaining the mass of a valve element of the electromagnetic valve, the spring stiffness and coil resistance data; establishing an electromagnetic valve equivalent circuit model, and listing a current equation; establishing an electromagnetic valve magnetic circuit mathematical model, and listing a magnetic field equation set; establishing an electromagnetic valve flow field mathematical model, and listing a flow field equation set; establishing a kinematic model of the electromagnetic valve, and listing a kinematic equation; using a finite element method to obtain a valve core electromagnetic force-displacement-current data table and a coil inductance-displacement-current data table; a finite element method is used for obtaining a valve element aerodynamic force-displacement data table; and obtaining the power-on and power-off delay time through data analysis processing and solving of the partial differential equation set. According to the method, prediction of the opening and closing delay response time of the electromagnetic valve is more accurate, visual adjustment in the simulation process is achieved, and the time for obtaining the response time of the electromagnetic valve and the test cost are greatly reduced while the preset precision requirement is met.

The invention relates to the technical field of magnetic material detection, in particular to a magnetizing body performance detection method and system and a medium, and the method comprises the steps: constructing a directional coupling magnetic circuit, enabling a magnetic sensor to synchronously sweep along the length direction of a magnetizing chain, applying external excitation, collecting signals in real time, and detecting the performance of a magnetizing body through the convergence effect of the directional coupling magnetic circuit on leakage magnetic flux. In the scanning process, a leakage magnetic flux space distribution spectrum on the surface of a magnetizing chain is collected, signal feature analysis is conducted on the leakage magnetic flux space distribution spectrum, a local field intensity distortion area is recognized, a defect fingerprint feature vector is generated, the defect fingerprint feature vector is compared with a preset eligibility criterion threshold value, and the eligibility of the magnetizing chain is judged. Therefore, the performance of each magnet in the magnetizing chain is judged and analyzed, the detection sensitivity of early defects and recessive magnet performance degradation is effectively improved, and the signal-to-noise ratio of an unqualified magnet identification signal is improved.

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 invention discloses a method and system for detecting the magnetization direction of an unmagnetized magnet, and belongs to the technical field of magnetic material detection. The method comprises the following steps: applying an external guide magnetic field to a to-be-detected non-magnetized magnet; detecting a signal related to the physical state of the non-magnetized magnet under the action of the guide magnetic field as a response signal; and judging the magnetization direction of the non-magnetized magnet based on the corresponding relation between the response signal and the preset magnetization direction. The corresponding system comprises a guide magnetic field generation unit, a detection unit and a discrimination unit. The modulation effect of magnetocrystalline anisotropy of a non-magnetized magnet on an external magnetic field is utilized, invisible magnetic domain orientation information is converted into externally observable physical field difference, efficient, visual and lossless recognition of the preset magnetization direction is achieved, and the method is suitable for production quality control of magnetic assemblies such as a Halbach magnetic circuit and the like.

The invention provides an outer rotor 3D magnetic flux permanent magnet synchronous motor, which comprises a rotor assembly, a stator assembly and a rotating shaft, the rotor assembly comprises a radial permanent magnet group and an axial permanent magnet group, the stator assembly comprises a stator iron core and an armature winding, the axial end parts of the two sides of the stator iron core are connected with magnetic conductive yokes, the end surfaces of the magnetic conductive yokes are provided with magnetic conductive shoes, and the magnetic conductive shoes are connected with the armature winding. A radial winding groove is formed between every two adjacent magnetic conductive boots; the armature winding comprises a plurality of winding units, and the bent parts at the two ends of each winding unit are embedded in the radial winding grooves in the two sides of the magnetic conductive shoe. According to the motor provided by the embodiment of the invention, the magnetic conductive shoes are creatively used at the end part of the stator core to guide the windings to carry out back winding arrangement, an axial armature magnetic field is generated, a radial magnetic circuit and two-side end part axial magnetic circuits are combined to form a hybrid excitation 3D magnetic flux structure, and radial magnetic flux and two-side axial magnetic flux cooperatively do work outwards in a parallel connection manner, so that the motor is more compact in structure. And the torque density and the loading capacity of the motor are obviously improved.

The invention relates to a special-shaped magnetic core loss test method. The method comprises the following steps: determining an equivalent standard magnetic core based on the shape of a special-shaped magnetic core; calculating the effective sectional area, the effective magnetic path length and the effective volume of the special-shaped magnetic core based on the equivalent standard magnetic core; calculating a test working voltage required by the magnetic core loss test based on a test working frequency, a test working magnetic flux density, the effective sectional area and the number of effective coils; and performing the magnetic core loss test based on the number of the effective coils, the test working frequency, the test working voltage, the effective sectional area, the effective magnetic path length and the effective volume. Therefore, the loss test of the special-shaped magnetic core can be realized.

The invention discloses a loudspeaker assembly and a production method thereof. The loudspeaker assembly comprises a frame and a magnetic circuit assembly. The magnetic circuit assembly comprises a washer, a magnet and T iron which are stacked in sequence, and the washer and the magnet are sleeved on a middle cylinder of the T iron; the basin frame is provided with a connecting part which is combined with the magnetic circuit assembly in a rubber coating mode, the connecting part wraps the peripheral wall of the washer, the peripheral wall of the magnet and the peripheral wall of the T iron, and the connecting part further wraps the end face of the washer and the end face of the T iron. The loudspeaker assembly is high in production efficiency and stable in structure.