119 results about "Magnetic effect" patented technology

The application discloses a flexible multi-dimensional force sensor based on a centripetal gradient magnetic field design and a preparation method thereof, and belongs to the field of electronic devices. The flexible multi-dimensional force sensor comprises, from top to bottom, a protective layer, a magnetic film layer, a buffer layer and a transmission layer. The protective layer comprises a flexible base material with force-sensitive characteristics. The magnetic film layer is provided with a cross-shaped groove on the bottom surface, and the edges of the groove are arc-shaped, so that a magnetic field with a gradient magnetic flux can be formed. The buffer layer comprises a strain material with a stepped shape. The transmission layer comprises an electromagnetic effect chip with three-axis magnetic field sensing capability and a readout circuit thereof. Compared with the prior art, the sensor of the application realizes natural decoupling from the magnetic field design, and has decoupling capability on three axes. The gradient design of the application enables the sensor to have different response slopes at different stress stages when subjected to stress, greatly improves the force measurement range of the device, and the sensing sensitivity and range on the three axes are the same.

The invention discloses drilling and polishing combined machining equipment based on hardware precision machining, and relates to the technical field of machining machine tools, the drilling and polishing combined machining equipment comprises a drilling machine, a hydraulic telescopic rod is arranged on the outer side of the drilling machine, a machining assembly is arranged at the telescopic end of the hydraulic telescopic rod, and the drilling and polishing combined machining equipment further comprises a drilling supporting table arranged below the machining assembly; a clamping assembly is arranged at the top of the drilling supporting table. The supporting pieces are pushed to move and rise through magnetic force, the multiple supporting pieces can be attached to the bottoms of the workpieces under the action of magnetism, liquid is injected into the mounting frame through the injection molding assembly after attachment is completed, the supporting pieces can be kept stable after rising, and annular attachment supporting is conducted on the positions, needing drilling, of different workpieces.

The invention relates to the technical field of microwave ferrite devices, and discloses a miniaturized broadband microstrip circulator based on a double-ferrite nested structure, comprising a substrate, the upper surface of which is provided with a magnetic conductive sheet; a high dielectric ceramic is arranged on the magnetic conductive sheet, and a low magnetic saturation ferrite and a high magnetic saturation ferrite are sequentially nested in an inner cavity of the high dielectric ceramic; a circuit is arranged on the upper surface of the high-dielectric ceramic, and a ceramic piece and a permanent magnet are sequentially installed above the circuit. According to the circulator, a magnetic conductive sheet is additionally arranged, a structure with high dielectric ceramics as a core is constructed, the characteristic difference of two ferrite gyromagnetic materials with different magnetic saturation intensities is utilized, and the frequency resonance characteristic of a center junction is adjusted through nested arrangement, so that gyromagnetic effects under different frequencies are complementary to expand the working frequency band. Meanwhile, the high-dielectric ceramic optimizes port impedance matching and reduces electromagnetic wave reflection by virtue of a high dielectric constant, and cooperates with an internal ferrite nested structure, so that the frequency bandwidth is widened through a composite material mode, and miniaturization and broadband effects are achieved.

The invention discloses a motor rotor and a generator, and relates to the technical field of motors, the motor rotor comprises a rotor support, a plurality of magnetic pole units are uniformly assembled on the side wall of the rotor support in the circumferential direction, and an inter-pole gap is reserved between every two adjacent magnetic pole units; each magnetic pole unit comprises a magnetic pole permanent magnet attached to the side wall of the rotor support, a pressing strip and an inter-pole magnetism gathering permanent magnet are assembled at the inter-pole gap, the inter-pole magnetism gathering permanent magnet is attached to the side wall of the rotor support, and the left end and the right end of the inter-pole magnetism gathering permanent magnet abut against the magnetic pole permanent magnet. The pressing strips are assembled on the interelectrode magnetism gathering permanent magnets and fixed through the fixing pieces, and the pressing strips and the fixing pieces press and fix the magnetic pole permanent magnets and the interelectrode magnetism gathering permanent magnets on the side wall of the rotor support. The motor rotor provided by the invention is obvious in magnetism gathering effect and has an air-gap magnetic field which is closer to sine distribution, and due to the existence of the magnetism gathering permanent magnets, the gap between poles is filled up, so that the surface of the rotor is smoother, and the wind friction loss is reduced.

The invention discloses a magnetic-mechanical-electric coupling amplitude-change pole simulation method based on finite element analysis, and relates to the technical field of magnetoelectric antenna simulation. The magnetic-mechanical-electric coupling amplitude-change pole simulation method based on finite element analysis comprises the steps that parametric modeling is carried out, and a multi-physical field environment is imported; defining material attributes; solid mechanics, an electrostatic field and a magnetic field are coupled, and piezoelectric and piezomagnetic effects are started; dividing grids and configuring a solver; executing simulation calculation; and evaluating displacement and stress results and performing iterative optimization. According to the magnetic-mechanical-electric coupling amplitude-change pole simulation method based on finite element analysis, through multi-physics field coupling simulation, electric-mechanical-magnetic energy conversion is accurately simulated, the problem of traditional simulation distortion is solved, a high-performance amplitude-change pole capable of amplifying the amplitude of a permanent magnet sheet to 9 micrometers is guided to be designed, and the radiation capacity and reliability are remarkably improved.

The present disclosure relates to a method (100) of magnetically calibrating a magnetometer sensing system (30) with respect to an electronic device (50), the method (100) comprising: detecting (110) a disturbing magnetic source (520) in the electronic device (50) relative to a reference coordinate system (X, Y, Z) of the magnetometer sensing system (30); identifying (120) one or more magnetometers (Sk,l) of the magnetometer sensing system (30) which are magnetically affected by the detected disturbing magnetic source (520); selecting (130) one or more balancing magnetic sources (400) to reduce a magnetic effect of the detected disturbing magnetic source (520) on the one or more identified magnetometers (Sk,l); and placing (140) the one or more selected balancing magnetic sources (400) in a fixed relation to the magnetometer sensing system (30) and / or to the disturbing magnetic source (520).

A kind of eddy current testing probe and method for identifying any crack and direction around hole, the probe includes a pie-shaped detection coil with middle magnetic core, the magnetic core not only ensures accurate positioning, but also uses magnetic collection effect by enhancing coil inductance, to strengthen the magnetic field inside and back of hole.The probe is also equipped with three layers of excitation coil, one layer and two layers of coil are arranged orthogonally, three layers and one layer of coil are at an angle of 135 °, realize the efficient detection of any direction crack and identify the direction of any crack defect.The flexible support of probe enables it to adapt to curved surface structure, widen the application range.The detection method uses orthogonal differential technology, uses the symmetry of hole structure to identify defects around hole, significantly improve the detection sensitivity of defects on the back and inside of hole structure.Compared with traditional surface and near-surface defect eddy current testing technology, the present application provides a more effective solution for high-precision detection of hole structure through innovative coil configuration and defect identification method.

The invention discloses a friction-free spring type safety valve, belongs to the field of pressure vessel protection, and aims to solve the problem of large friction force of a large-diameter valve rod of a steam extraction pipeline of a steam turbine. Comprising an upper guide assembly and a lower guide assembly, the upper guide assembly comprises a second permanent magnet ring, the lower guide assembly comprises a first permanent magnet ring, the upper portion of a valve rod assembly is sleeved with an upper magnetic ring, the lower portion of the valve rod assembly is sleeved with a lower magnetic ring, and the first permanent magnet ring, the second permanent magnet ring, the lower magnetic ring and the upper magnetic ring are all axially magnetized magnetic rings. The upper magnet ring and the lower magnet ring are arranged in a homopolar opposite mode, the polarity directions of the upper magnet ring and the second permanent magnet ring are the same, the upper magnet ring and the second permanent magnet ring form a magnetic action gap, the polarity directions of the lower magnet ring and the first permanent magnet ring are the same, and the lower magnet ring and the first permanent magnet ring form a magnetic action gap. The radial magnetic effect resultant force of the second permanent magnet ring on the upper magnetic ring points to the axis of the upper guide assembly, the radial magnetic effect resultant force of the first permanent magnet ring on the lower magnetic ring points to the axis of the lower guide assembly, and the friction force of the valve rod assembly is zero.

A power contactor comprising a fixed part and a movable part translated relative to the fixed part in a displacement direction between a contact position forming a normally closed rest position of the contactor and a cut-off position driven by a linear actuator (12), the displacement of the movable part driving a movable contact (24) to move, the invention relates to a linear actuator (10) having a movable portion (12), which is separated from opposing fixed contacts (26) in an arc extinguish chamber (22) while compressing a contact pressure spring (28) and a core return spring (30), characterized in that the movable portion is rebounded in order to prevent any rebound during the return of the linear actuator to its rest position. The magnetic effect holding member fixes the movable portion in the contact position before the movable portion rebounds due to the spring action.

The utility model discloses a biological membrane coupled magnetic field reinforced artificial wetland device, which belongs to the technical field of artificial wetlands and comprises a shell, a biological membrane unit, an artificial wetland unit and an adsorption unit which are sequentially arranged in the shell from left to right. A water inlet pipe and a water outlet pipe are formed on the two sides of the shell respectively, a magnetic strengthening assembly is arranged in the constructed wetland unit, and the magnetic strengthening assembly comprises a permanent magnet, an electromagnetic coil and an electromagnetic generator. The device disclosed by the utility model has the beneficial effects that the device is connected to sewage and wastewater to be treated, efficient nitrogen and carbon removal can be realized through the multi-stage effect of cooperative treatment of the biological membrane unit, the constructed wetland unit and the adsorption unit, and meanwhile, the adjustable magnetic field strengthening assembly is arranged in the device, so that the device is more stable and reliable. The growth and metabolism of microorganisms can be promoted through an adjustable magnetic effect, and the pollutant removal efficiency of the system is further improved.

The utility model relates to the technical field of conditioning cabins, in particular to a spine conditioning cabin which comprises a lower cabin and an upper cabin detachably connected with the lower cabin. The lower cabin is provided with a movable cavity; a first massage seat and a second massage seat are movably arranged in the movable cavity in the length direction of the lower cabin; a fixed seat is arranged between the first massage seat and the second massage seat; the fixed seat is provided with a gyromagnetic device; and a driving assembly is arranged in the movable cavity. The first massage seat and the second massage seat are movably arranged in the lower cabin, the driving assembly drives the first massage seat and the second massage seat to reciprocate during use, so that the spine of a user can be massaged and conditioned, and in addition, the gyromagnetic device is arranged between the first massage seat and the second massage seat, so that the spine of the user can be massaged and conditioned. The gyromagnetic device generates a gyromagnetic effect to condition the user, and the gyromagnetic device can move along with the first massage seat and the second massage seat, so that the conditioning effect can be improved.

The utility model relates to a wearable armor processing technology, and provides a wearable armor magnetic attraction mechanism which comprises a hollow shaft, one end of the hollow shaft is provided with a matching piece, the matching piece is provided with at least one magnet mechanism, the magnet mechanism is used for applying a magnetic field forming an effect to a wearable armor, a curing mechanism is installed in the hollow shaft, and the curing mechanism is used for curing the wearable armor. According to the wearable nail fixing device, the magnet mechanism is installed at one end of the hollow shaft, a generated magnetic field mainly acts on the wearable nail aligned with one end of the hollow shaft, and therefore the wearable nail fixing device can be used for fixing the effect of the wearable nail. The magnetic attraction mechanism is used in cooperation with a curing mechanism installed in the hollow shaft, a magnetic field and curing energy can be highly concentrated, other wearable armor cannot be affected, therefore, accurate and efficient personalized customization and the uniform curing effect are achieved, meanwhile, the magnetic attraction mechanism is also used in the printing industry, the spraying industry and other industries, and the application range is wide. And a processed product has a special magnetic effect and high-grade anti-counterfeiting property.

This application relates to a rotor and a permanent magnet motor. The rotor includes a rotor core and a plurality of permanent magnets. The rotor core includes a shaft hole, and a plurality of mounting cavities are spaced apart on the outer periphery of the shaft hole. The permanent magnets are embedded in the mounting cavities. Every two adjacent permanent magnets with the same polarity form a V-shaped magnetic pole with the tip of the magnetic pole facing the shaft hole. The area of ​​the permanent magnet is S1, the remanence of the permanent magnet is Br, the outer diameter of the rotor core is R, and the diameter of the shaft hole is r. S1, Br, R, and r satisfy: 0.051 ≤ S1 * Br / (R 2 -r 2 The rotor according to this application can fully utilize the magnetic focusing effect of the magnetic poles, effectively improve the air gap magnetic flux density of the permanent magnet motor, improve the back electromotive force waveform, and help improve the torque output performance of the permanent magnet motor, thereby improving the efficiency of the permanent magnet motor when operating at low frequency, while avoiding magnetic circuit saturation of the rotor core.

The utility model provides an anti-backflow assembly and a dish-washing machine, and relates to the technical field of kitchen appliances, the anti-backflow assembly comprises a drainage mechanism and a check valve; the drainage mechanism has a sealing structure; the check valve is connected with the drainage mechanism, and the check valve and the sealing structure are oppositely arranged; the sealing structure and the check valve can be attached through magnetic adsorption or pressure so that the check valve and the sealing structure can be closed and sealed. After the drainage requirement is met, the check valve and the sealing structure are sealed in a closed mode under the magnetic effect or the check valve and the sealing structure are sealed in a closed mode under the external pressure effect so that water in the drainage mechanism can be prevented from flowing back into the water tank. The check valve is attached to the sealing structure through magnetism or external pressure, so that closed sealing of the check valve and the sealing structure is achieved, the anti-backflow effect of the check valve is good, and the problem that the amount of backflow water at the bottom of the water tank is too large due to self-profiling errors, material aging and uncertain water pressure in the drainage mechanism of the check valve is solved.

The utility model relates to the field of air purification, in particular to an air purification device for a subway station based on electromagnetic adsorption, which comprises a reverse fan unit, a coarse filter unit and an electromagnetic filter unit, and the electromagnetic filter unit is arranged between the reverse fan unit and the coarse filter unit. The electromagnetic filter unit comprises a filter element and a coil, the filter element comprises a filter element framework and a filter screen, and the filter screen is made of a soft magnetic material. According to the utility model, the electromagnetic filter unit is arranged, the electromagnetic effect principle is utilized, and the coil is electrified, so that a high-gradient magnetic field is generated in the filter element, and ferromagnetic particles in the air are adsorbed by the filter element, so that high-concentration iron-containing particles in the air in the subway station can be removed in a targeted manner, and the subway air quality is remarkably improved; and the body health of passengers and subway workers is protected.

A charging device for an electric curtain, comprising an auxiliary rod (1) and a charging wire (2) connected to the auxiliary rod (1). One end of the charging wire (2) is provided with a magnetic attraction head (2.1); the magnetic attraction head (2.1) is magnetically and electrically connected to a charging port of the electric curtain; the end of the charging wire (2) provided with the magnetic attraction head (2.1) is connected to the upper end of the auxiliary rod (1); the auxiliary rod (1) is used for bringing the end of the charging wire (2) provided with the magnetic attraction head (2.1) to the height of the charging port of the electric curtain, such that the magnetic attraction head (2.1) and the charging port are quickly connected for charging. One end of the charging wire (2) is changed into a magnetic attraction head, and the end of the charging wire (2) provided with the magnetic attraction head (2.1) is brought to the height of the charging port of the electric curtain by means of the auxiliary rod (1), so that the magnetic attraction head (2.1) is facilitated to be quickly magnetically and electrically connected to the charging port of the electric curtain to realize quick charging, and there is no need for people to climb up to plug the charging wire (2) into the charging port, making charging more convenient and safer; and in addition, the magnetic effect of the magnetic attraction head (2.1) can realize quick positioning and quick connection.

The invention discloses a transformer winding loss calculation method and a related device. The method comprises the steps of obtaining harmonic current of an environment where a transformer winding is located; calculating the AC resistance of the transformer winding according to the harmonic current through a skin effect and a proximity effect; acquiring a non-sine-wave current of an environment where the transformer winding is located, and decomposing the non-sine-wave current into a plurality of harmonic components; after the height of the transformer winding is adjusted to be equal to the height of the magnetic core window based on a preset transformer winding design method, the frequency of each harmonic component is calculated, and the total winding loss is calculated according to the frequency of the harmonic component and the alternating-current resistance. By optimizing the structure of the winding and the loss calculation method, the operation efficiency and reliability of the medium-frequency transformer are effectively improved, and energy loss caused by the high-frequency electromagnetic effect is reduced. Therefore, the problems of loss increase caused by inaccurate winding loss calculation and winding height mismatching in a high-frequency environment and complex loss caused by harmonic current in the prior art are solved.

The utility model relates to the technical field of refrigerators, in particular to an inner container structure of a refrigerator door and a refrigerator. The liner structure of the refrigerator door comprises a liner body, a magnetic part and a separator, the liner body is provided with an inner side and an outer side which are opposite to each other, and the inner side of the liner body is provided with a mounting groove; the magnetic piece is fixed in the mounting groove; the separator is fixedly embedded in the mounting groove, the separator is provided with a first positioning groove, and at least one part of the magnetic part is located in the first positioning groove to limit the magnetic part. According to the liner structure of the refrigerator door and the refrigerator, the separators are arranged, the mounting grooves of the liner body are combined, the magnetic parts are limited and fixed, when the multiple refrigerator doors are stacked, the magnetic parts are located in the limiting structures all the time and cannot deviate due to the influence of the magnetic effect, meanwhile, the separators are embedded and fixed in the mounting grooves, the structure is simple, and the practicability is high. And the service life of the refrigerator door is prolonged, and the cost is saved.

The application discloses a low-noise high-sensitivity micro planar laminated magnetic induction type magnetic sensor, which comprises, from bottom to top, an insulating base, a bottom magnetic film, a combined coil and a top magnetic film; insulating isolation layers are arranged between the combined coil and the bottom magnetic film and the top magnetic film; the bottom magnetic film and the top magnetic film are rectangular planar magnetic films or surface strip grid pattern magnetic films; at least one of the bottom magnetic film and the top magnetic film is a surface strip grid pattern magnetic film; and the combined coil is a double helix coil structure, comprising alternating excitation coils and induction coils. The application not only weakens the demagnetization effect of the surface strip grid pattern magnetic film in the length direction, enhances the effective permeability of the surface strip grid pattern magnetic film in the length direction, but also suppresses eddy current noise, so that low-noise high-sensitivity magnetic field detection is realized.

The utility model provides an airtight plug of an explosion-proof valve based on an electromagnetic effect. The airtight plug of the anti-explosion valve comprises a connecting part, a moving part and an electromagnetic effect part, the connecting part comprises a second magnetic part, and an anti-explosion valve body is arranged on the connecting part so that a first magnetic part and the second magnetic part can attract each other; the moving part comprises a first guide rod connected with the connecting part, the electromagnetic effect part comprises an elastic piece wound around the first guide rod and a power supply assembly connected with the elastic piece, and the elastic piece can generate magnetism the same as the magnetic field of the second magnetic piece through the power supply assembly. The anti-explosion valve airtight plug based on the electromagnetic effect is simple in overall structure and convenient to machine and manufacture, magnetic attenuation can be made up, then it is guaranteed that the anti-explosion valve body can be normally opened and closed, and inaccurate airtightness testing caused by magnetic attenuation is avoided; and the whole structural design is not changed, the explosion-proof valve body can be matched, the same model is kept, so that the design cost is controlled, the universality is high, and the application range is wide.

The utility model provides an infrared soft magnetic clamping device, and relates to the field of soft magnetic material testing. The infrared soft magnetic clamping device comprises a base, a shell is fixedly installed on the base, a protective door is arranged on the front face of the shell, a cross-shaped sliding table mechanism is installed on the base and located in the shell, a test board is fixedly installed in the middle of the upper surface of the base, and infrared receivers distributed in a circle are fixed to the upper surface of the bottom end of the test board. A display screen is installed on the upper surface of the base and located on one side of the testing table, and a clamping assembly is installed at the output end of the cross-shaped sliding table mechanism. According to the infrared soft magnet clamping device, the clamping assembly is arranged, the test coil corresponds to the hollow cavity, the cross-shaped sliding table mechanism is controlled, the clamping assembly moves downwards, and the test coil can enter the four arc-shaped pieces, so that stable clamping in the testing process can be achieved, stable clamping in the transferring process can also be achieved, and the soft magnet effect cannot be damaged.

A kind of design method and sensor of wide-range current sensor based on magnetomotive effect, in the method, magnetomotive body is provided and the magnetomotive body is arranged between energized conductor and magnetic field sensor sensing chip;The magnetic flux density at the position of the magnetic field sensor sensing chip is reduced by the magnetomotive effect of the magnetomotive body, so that the magnetic field sensor sensing chip remains linear response in wide current range, and wide-range current measurement is realized.By the action of high magnetic permeability magnetomotive body, the magnetic flux density at the position of TMR sensing chip is significantly weakened, so that the sensor magnetic saturation phenomenon is effectively delayed.The method significantly widens the current measurement range of the sensor under the premise of maintaining small size, and realizes the breakthrough of traditional TMR current sensor in wide-range measurement field.

The invention provides an axial motor rotor structure, and aims to solve the problems of poor magnetism gathering effect and low magnetic steel utilization rate of an axial motor structure in the prior art. The rotor structure mainly comprises a supporting plate, a plurality of magnetic steel arranged in the circumferential direction and a rotor iron core. The magnetic steel and the rotor iron core are alternately and adjacently arranged to form a closed-loop structure and are fixed to the supporting plate. And the built magnetic flux path adopts a tangential magnetizing mode, so that the magnetic flux of the two adjacent magnetic steels can flow through the rotor core and then converge into an air gap to form a magnetism gathering effect. Through tangential magnetizing and unique magnetic circuit design, the air gap magnetic flux density and the motor salient pole rate are remarkably improved, the magnetic resistance torque is increased, meanwhile, the end magnetic leakage and the rotor loss are effectively reduced, and meanwhile the permanent magnet motor has the advantages of being high in power density, large in torque density, high in efficiency and low in material cost.

The utility model discloses an electrified coil magnetic field effect demonstration device which comprises a wire duct, a cross beam, an upper buckle, a lower buckle, a footstand, a connecting plate, a threading hole, a binding post clamping groove, a binding post and a coil. Compared with the prior art, the device disclosed by the utility model is lower in overall cost and simpler and more convenient in production process, and achieves the effects of small size, light weight, convenience in carrying and simplicity in operation on the premise of ensuring the experiment effect. After the device is electrified, the magnetic needle base and the magnetic needle can be arranged outside and inside the connecting plate and can move freely, so that magnetic effect differences of different positions of the electrified coil can be observed conveniently, and teaching and learning are facilitated.

The invention provides a magnetic attraction type multistable switching structure and electronic equipment. The magnetic attraction type multistable switching structure comprises at least two fixed magnetic bodies, at least two movable magnetic bodies and at least two movable magnetic bodies, the movable magnetic body is configured to be capable of being kept at a corresponding steady-state position through a magnetic effect when moving to be close to any fixed magnetic body; and the magnetic field sensing device is configured to sense magnetic field states of the movable magnetic body at different steady-state positions and output a detection signal. According to the invention, different steady-state positions of the movable magnetic body can be accurately distinguished, and accurate identification of the state or the spatial position is realized.

The invention discloses nano magnetic powder with high dispersity and uniform particle size and a preparation method of the nano magnetic powder, and belongs to the technical field of powder material preparation and treatment. According to the invention, the dispersion medium, the dispersing agent and the wetting agent are added into the nano magnetic powder, so that efficient dispersion of the nano magnetic powder can be realized; meanwhile, the ultrahigh-pressure jet flow homogenization treatment is combined, so that soft aggregates can be thoroughly crushed, and the nano magnetic powder is monodispersed; besides, after the coating agent is used for coating, the magnetic effect can be weakened, secondary agglomeration can be prevented, and the stability of the coating slurry and the nano magnetic powder is remarkably improved; the particle size distribution of the powder can be accurately regulated and controlled by further adopting rotational flow grading treatment, and the nano magnetic powder with uniform particle size distribution is obtained; and the whole preparation process flow realizes integration of dispersing, coating, grading and drying, the process flow system is complete, parameters are easy to control, the method is suitable for large-scale continuous production, and the product performance is stable and reliable.

The application discloses a motor rotor and a generator, and relates to the technical field of motors, which comprises a rotor support, a plurality of magnetic pole units are uniformly arranged on the side wall of the rotor support in the circumferential direction, and an inter-pole gap is left between two adjacent magnetic pole units; each magnetic pole unit comprises a magnetic pole permanent magnet attached to the side wall of the rotor support, a pressing strip and an inter-pole magnetic concentration permanent magnet are arranged at the inter-pole gap, the inter-pole magnetic concentration permanent magnet is attached to the side wall of the rotor support and abuts against the magnetic pole permanent magnet at the left and right ends, the pressing strip is arranged on the inter-pole magnetic concentration permanent magnet and is fixed by a fixing member, and the magnetic pole permanent magnet and the inter-pole magnetic concentration permanent magnet are tightly fixed on the side wall of the rotor support by the pressing strip and the fixing member. The motor rotor provided by the application has obvious magnetic concentration effect, has an air gap magnetic field which is closer to a sine distribution, and due to the existence of the inter-pole magnetic concentration permanent magnet, the inter-pole gap is filled, the rotor surface is smoother, and the wind friction loss is reduced.

The invention provides an electromagnetic force variable-gap magneto-rheological damper. The electromagnetic force variable-gap magneto-rheological damper comprises a rotating shaft, wherein the rotating shaft is mounted in a cylinder barrel in a penetrating manner through a bearing; the rotating disc is fixed on the rotating shaft; the floating disc is installed on the rotating shaft through an end face bearing, and a reset spring is arranged between the end face bearing and the rotating disc, so that a width-adjustable working gap is formed between the floating disc and the rotating disc. The magnet exciting coil assembly is installed in the cylinder barrel, fixedly connected with the upper end and the lower end of the cylinder barrel and wound around the floating disc and the rotating disc. When the current of the excitation coil assembly is reduced, the floating disc is far away from the rotating disc, the working clearance is gradually increased, and the damping force is reduced; when the current of the magnet exciting coil assembly is increased, the floating disc is close to the rotating disc, the working gap is gradually reduced, and the damping force is increased. Based on the magnetic effect principle of an electrified coil, real-time dynamic adjustment of the effective working flow channel width is achieved. The zero-field damping force is smaller, the maximum damping force is larger, and the adjustable range is larger, so that the device can adapt to more complex application scenes.

The invention belongs to the technical field of solid waste treatment and resource utilization, and relates to a kitchen biogas residue micro-plastic deep separation method based on in-situ biological membrane stripping and hydrophobic magnetic induction. Comprising the following steps: adding an EPS deconstruction compound enzyme preparation and a cationic chelating agent into kitchen biogas residues subjected to anaerobic digestion, and carrying out ultrasonic treatment to strip a biological membrane on the surface of micro-plastic so as to obtain biogas residue slurry; the EPS deconstruction compound enzyme preparation is prepared from protease, alpha-amylase and cellulase; fully mixing super-hydrophobic magnetic nanoparticles with the biogas residue slurry, and then carrying out magnetic separation; the super-hydrophobic magnetic nanoparticles are magnetic nanoparticles of which the surfaces are modified with hydrophobic groups. According to the method provided by the invention, through a chemical-physical synergistic effect, efficient stripping of a biological membrane on the surface of the micro-plastic is realized, the micro-plastic is accurately captured in a targeted manner by utilizing a hydrophobic magnetic effect, meanwhile, the dehydration performance of the biogas residues is improved, and synergistic interaction of removal of the micro-plastic and recycling of the biogas residues is realized.