713 results about "Rotating magnetic field" patented technology

A driving method of a transcranial magnetic stimulation 3D coil device is disclosed, which includes: determining first and second signal peaks corresponding to a specified rotating magnetic field direction, in which the first and second signal peaks respectively correspond to first and second coils in multiple coils; providing a first pulse current having the first signal peak to the first coil, in which the first pulse current signal stimulates the first coil to provide a first magnetic field; providing a second pulse current signal having a second signal peak to the second coil, in which the second pulse current signal stimulates the second coil to provide a second magnetic field, in which the first magnetic field and the second magnetic field form a rotating magnetic field having the specified rotating magnetic field direction.

The utility model discloses an ultrasonic composite magnetic field auxiliary polishing device, and belongs to the field of precision machining of curved surfaces of complex structures. The device comprises a six-axis precision machine tool, an electric spindle, an ultrasonic vibration device, a multi-magnetic-pole coupling polishing device, a workpiece, a connecting clamping device and an industrial control host, the electric spindle is clamped on an A-axis indexing table of the machine tool, the ultrasonic vibration device is installed at the tail end of the electric spindle, and the multi-magnetic-pole coupling polishing device is installed at the lower end of the ultrasonic vibration device through a connecting sleeve. According to the types of magnetic poles, the multi-magnetic-pole coupling polishing device is divided into a permanent magnetic pole polishing device, an electromagnetic pole polishing device and a mixed magnetic pole polishing device. The industrial control host controls all the modules to achieve cooperative movement, the multi-magnetic-pole coupling polishing device generates a coupling rotating magnetic field, the ultrasonic vibration device enhances relative movement between the surface of a workpiece and a polishing medium, and the polishing consistency and the machining quality of a complex structure curved surface are improved.

The invention relates to the technical field of magnetron sputtering, and particularly discloses a magnetron sputtering silver-coated conductive material powder device based on an ultrasonic-electromagnetic suspension composite dispersion system and application of the magnetron sputtering silver-coated conductive material powder device. In order to solve the technical problems of powder agglomeration, low target material utilization rate and poor large-scale production uniformity, a porous ceramic tool plate is used as a core carrier, and a high-frequency ultrasonic vibrator array (adjustable in 20-100kHz), a planar rectangular cathode (with an inclination angle of 0-15 degrees) and a Helmholtz coil (0.1-0.5 T rotating magnetic field) are integrated; non-contact dispersion of powder and precise coating of a silver layer are achieved through the cavitation effect, electromagnetic suspension and multi-target cooperative sputtering. The tool disc adopts a gradient aperture design, and is combined with liquid nitrogen micro-channel cooling and a modular sub-cavity structure, so that the powder dispersion uniformity (CV value lt; 5%), the silver layer porosity (llt; 1%), the target material utilization rate (52%) and the single-furnace productivity (72 kg / 8 h) are obviously optimized, and an efficient and environment-friendly industrialization solution is provided for the field of electronic materials.

Provided is a water pump using an axial gap-type electric motor employing a rare-earth-free magnet. The water pump (EWP) includes: a pump housing having a space in a sealing state on one side thereof, in which, on the other side thereof, an inlet through which a fluid is introduced and an outlet through which the introduced fluid is discharged are connected through a fluid flow passage; a rotor rotatably supported on the fluid flow passage; an impeller integrally formed with the rotor on the upper side of the rotor; a stator arranged in the lower space to generate a rotating magnetic field to rotatably drive the rotor; and a waterproof partition wall arranged inside the pump housing to separate the rotor from the stator.

The invention discloses a brushless direct current motor and a control method thereof, and relates to the technical field of motor equipment.The brushless direct current motor comprises a motor shell and further comprises a driving circuit, and the driving circuit is located in the motor shell. A protective cover is arranged on the outer side of the rotor mounting cover, and a positioning clamping seat is arranged on one side of a heat dissipation fan blade to reinforce and mount the motor shell and the rotor mounting cover, so that the connection stability of equipment in use is improved; the auxiliary mounting mechanism is arranged, the motor shell and the mounting side plate are subjected to reinforced connection treatment through the first connecting shaft, and daily maintenance treatment can be conveniently carried out on the whole; according to the invention, the MCU unit is used for receiving the position feedback from the Hall sensor, and the MCU unit can control the current switching of the stator winding, so that a rotating magnetic field is generated to drive the rotor to rotate, and the error is the difference between a target value and an actual value.

The invention discloses a sewage zero discharge treatment device which comprises a sewage treatment tank, a first partition plate, a second partition plate, a third partition plate and a fourth partition plate are arranged in the sewage treatment tank, a closed area between the third partition plate and the fourth partition plate forms a collection pool, and a rotating magnetic field device is arranged on the periphery of an anaerobic pool. The rotating magnetic field device generates a rotating magnetic field, ferroferric oxide nanoparticles with the surfaces modified with sulfonic acid groups exist in the anaerobic tank, the ferroferric oxide nanoparticles have superparamagnetism and are driven by the rotating magnetic field to form a directional vortex flow, and the ferroferric oxide nanoparticles adsorb protons and load anaerobic microorganisms. A magnetic biological membrane is formed, meanwhile, the mixed mass transfer efficiency of microorganisms and sewage is enhanced through the directional vortex flow, an ultrasonic vibrator array is arranged at the bottom of the aerobic tank, and a collecting device is arranged above the sewage treatment tank.

The invention relates to the technical field of electric energy storage, and provides a flywheel energy storage motor and a use method. The rotor is rotationally connected to the interior of the shell, and magnetic resistance of the rotor is non-uniformly distributed in the circumferential direction of the rotor; the stator is arranged on the outer side of the rotor in a surrounding mode in the circumferential direction of the rotor, and the stator is connected with the shell; a stator coil is connected to one surface, facing the rotor, of the stator and is used for generating a rotating magnetic field capable of rotating around the axis of the rotor; gaps are formed between the stator and the rotor and between the stator coil and the rotor; the two ends, in the axis direction of the rotor, of the rotor are each provided with at least one magnet exciting coil, the magnet exciting coils are connected with the shell, the axes of the magnet exciting coils are parallel to the axis of the rotor, and gaps exist between the magnet exciting coils and the stator. According to the invention, the technical problems of complex structure, high manufacturing cost, poor high-temperature adaptability and great bearing burden caused by mainly adopting a flywheel permanent magnet motor in the existing flywheel energy storage technology can be solved.

The invention relates to the technical field of substrate material surface plating, in particular to a method for electrochemical plating of a perovskite thin film through an ionic electrolyte, and the method comprises the following steps: S1, preparing the ionic electrolyte containing a double-complexing agent system and a two-dimensional nano filler; s2, the ion electrolyte and the substrate are placed in a rotating magnetic field for a pulse electrodeposition process, and ultrasonic waves are applied to the bottom of the rotating magnetic field; s3, adopting an asymmetric third-order pulse waveform in the pulse electrodeposition process; s4, in the pulse electrodeposition process, synchronizing terahertz time-domain spectroscopy and confocal Raman imaging to monitor grain boundary defects of the deposition layer; and S5, entering an annealing stage after the process is ended, and introducing pyrrolidone steam to form a C-N bond passivation layer. According to the method, the ion electrolyte containing the specific double complexing agent system and the two-dimensional nano filler is accurately prepared, so that the uniformity and efficiency of the plating process are improved, and the stability of the ion electrolyte is ensured.

The invention discloses a finite element simulation method for motion of a magnetically-driven spiral micro-robot in a fluid environment, and belongs to the technical field of finite element simulation. According to the method, a micro-robot model containing a streamline head and a spiral empennage and a fluid environment are constructed through COMSOL software, a peristaltic flow module and a multi-body dynamics module are integrated through the fluid-solid coupling technology, and a fluid-solid coupling transient motion equation is established. The motion characteristics of the micro-robot driven by a rotating magnetic field are accurately simulated by setting material nonlinear parameters, dynamic self-adaptive grid division and a non-uniform step size solving strategy. A rigid domain motion equation and an open boundary condition are innovatively introduced, speed and acceleration probes are combined for real-time monitoring, and the flow field vortex effect caused by spiral propulsion is captured. According to the method, the simulation error is controlled within 5%, the motion trail prediction precision is remarkably improved, a reliable simulation platform is provided for micro-robot structure optimization and magnetic control strategy design, the experiment cost is reduced, and the research and development period is shortened.

The invention discloses a support installation angle measuring device for photovoltaic power generation, which relates to the technical field of measurement and comprises an installation position structure, a magnetic field control assembly and a measuring assembly. The installation position structure is arranged at the connection position of a stand column and a cross beam of the photovoltaic support, the connection point of an inclined supporting rod and a main frame and the connection area of a base and a foundation, under the cooperation of the magnetorheological fluid cavity assembly and the magnetic field control assembly and the design of a spiral flow guide groove and a cone frustum cavity, the fluid distribution uniformity is improved, and under the action of a magnetic field, the fluid distribution uniformity is improved. The spiral flow guide grooves guide the magnetorheological fluid to form spiral flow and cooperate with a rotating magnetic field, the support fixing effect is remarkably enhanced, and when the support deviates due to external force, the micro stress sensor of the magnetorheological fluid cavity reversely deduces the angle through shear stress changes and feeds the angle back to the magnetic field control assembly for real-time correction. Therefore, stress is released and deformation is corrected under extreme working conditions such as strong wind and earthquakes, and the accuracy and response speed of angle control and measurement of the support are greatly improved.

The invention relates to the technical field of motors, and discloses a frameless torque motor which comprises a stator used for generating a rotating magnetic field, a plurality of stator grooves are formed in the inner wall of the stator at equal intervals, a stator winding is arranged between every two adjacent stator grooves, and a rotor used for generating rotating motion under the rotating magnetic field of the stator. The rotor is arranged in the stator and is concentric with the stator, and an air gap is formed between the rotor and the stator. When the rotor rotates clockwise or anticlockwise, through cooperation of the heat dissipation assembly and the air supply assembly, the fan blades rotate left and right by a certain angle, air flow is driven to enter a cavity formed by the mounting disc, the lower cover plate, the heat dissipation box and the air gaps, and therefore the air flow conducts heat dissipation and cooling on the stator and the rotor; the frameless torque motor is prevented from being damaged due to overheating during long-time operation, and normal operation of the frameless torque motor is guaranteed.

The invention provides a round billet continuous casting machine and multi-stage multi-mode electromagnetic stirring device matching method, and belongs to the technical field of metallurgy continuous casting, and the method comprises the steps that an electromagnetic stirrer in a crystallizer area applies a rotating magnetic field in the initial solidification stage, and the forming quality of an initial solidification shell is optimized; an electromagnetic stirrer in the secondary cooling area utilizes a traveling wave magnetic field to continuously regulate and control the solidification process of the core part of the casting blank; the feeding effect of a final solidification section is remarkably improved through the action of a high-intensity magnetic field by an electromagnetic stirrer in a solidification tail end area, and multiple matching modes are produced to be matched with existing continuous casting processes of different steel grades according to the characteristics of the steel grades, the throwing direction of each area and the type of the electromagnetic stirrer. And then through linkage of the multi-stage multi-mode electromagnetic stirring device and cooperative control over continuous casting process parameters, the equiaxed crystal area of the casting blank is enlarged, segregation is reduced, the internal quality of the casting blank is improved, and the density, uniformity and mechanical performance of the casting blank are improved.

The utility model relates to the related technical field of motors of electric motorcycles, in particular to a motor of an electric vehicle, which comprises a motor shaft, first magnetic steel is fixedly connected to the inner side surface of an iron ring, and second magnetic steel is fixedly connected to the inner side surface of the iron ring. According to the electric vehicle motor, through the arrangement of the first magnetic steel and the second magnetic steel, when current enters the winding of the stator 11, the winding of the stator 11 can generate a rotating magnetic field according to the law of electromagnetic induction, and under the interaction of the magnetic field, generated electromagnetic force can drive the motor shaft 1 to rotate, so that electric energy is more effectively converted into mechanical energy; the double-row magnetic steel mode improves the strength of single magnetic steel, the double-magnetic-circuit mode is adopted, the two pieces of short magnetic steel are easy to machine, the manufacturing cost is low, the product cost is reduced, and the cost performance is improved.

A robot includes a hand motor configured to independently rotate a first hand and a second hand around a hand axis along a vertical orientation. The hand motor includes: a first output shaft fixed to the first hand; a first stator configured to apply a rotating magnetic field on the first output shaft in the arm link; a second output shaft extending through the first output shaft and fixed to the second hand; a second stator configured to apply a rotating magnetic field on the second output shaft in the arm link; a first bearing held by the arm link and holding the first output shaft or the second output shaft; and a second bearing held by the second output shaft between an outer periphery of the second output shaft and an inner periphery of the first output shaft.

The invention belongs to the technical field of biomedical materials, and particularly relates to application of a HAp-MXene nano composite material in regulation and control of an osteogenesis immune microenvironment. The HAp and MXene nanocomposite is obtained by combining hydroxyapatite nanorods and MXene nanosheets, the HAp and MXene nanocomposite is interfered by adjusting an external magnetic field, so that the HAp and MXene nanocomposite shows one effect of regulating and controlling polarization of macrophage M1 or macrophage M2; then, the HAp-MXene nanocomposite is implanted into a bone defect area, and in the initial stage of the operation, the magnetoelectric effect of MXene is excited by applying a rotating magnetic field, polarization of M1 type macrophages is promoted, proinflammatory factors are generated, and bacterial infection is inhibited; then, in the middle stage, through removing a magnetic field, releasing calcium ions, promoting polarization of the M2 type macrophages, relieving inflammatory response and promoting bone regeneration, programmed regulation and control of the macrophages are achieved in different repair stages.

A rotary machine (10) comprises a stator (30), a rotor (40), and cooling piping (60). The stator (30) has an annular shape and generates a rotating magnetic field. The rotor (40) is disposed so that an axial gap is provided with respect to the stator (30). The cooling piping (60) has, in the interior thereof, a passage (60a) through which cooling liquid flows. Furthermore, the cooling piping (60) is thermally connected to a stator inner peripheral surface (33b), which is the annular inner peripheral surface of the stator (30).

The invention discloses a horizontal two-dimensional orientation steel fiber UHPC wind power tower drum ring piece preparation device and method, and relates to the technical field of wind power tower drum engineering. The device is mainly composed of an annular mold, an annular sliding rail, an electric sliding block, coils and a direct-current power source, the direct-current power source supplies power to the coils on the inner side and the outer side to generate a uniform and controllable magnetic field, the coils are driven by the electric sliding block to achieve synchronous annular rotation, the magnetic field intensity and the action time are adjusted according to different flowing degrees of UHPC mixtures, and therefore the UHPC mixtures can be manufactured. And under the action of a rotating magnetic field, the steel fibers form two-dimensional distribution in a horizontal plane. Compared with a traditional UHPC wind power tower drum, the horizontal two-dimensional directional steel fiber reinforced UHPC wind power tower drum produced by the device has the advantages that the compression bearing capacity is improved by 15%-20%, and the compression fatigue resistance is improved by 40%-50%. According to the tower drum structure, the thickness of the tower drum ring section can be reduced by 10%-20%, the dead weight of the tower drum and the consumption of raw materials are reduced, and the transportation and construction cost is reduced. The device is simple in design and convenient to disassemble and assemble, has efficient and reliable industrial production potential, and can be widely applied to manufacturing and optimization of wind power towers.

The invention provides a double-rotor direct-drive coaxial reverse-propeller electric ducted fan, which is characterized in that a single motor with an inner rotor and an outer rotor directly drives two pairs of blades, an intermediate transmission device and an inner rotor excitation group to generate a rotating magnetic field, and a first-stage propulsion component and a second-stage propulsion component with the same rotational inertia are driven under the action of electromagnetic torque with the same acting force and counter-acting force; one-way rotation deflection torque is balanced, and coaxial reverse propeller movement is achieved; the rectification duct reduces the induced resistance of the blades and improves the propulsive efficiency, the convergence and expansion guide sleeve and the motor frame body dissipate heat to form circulating heat dissipation of the Brayton heat engine, meanwhile, air is heated, expanded and ejected out to generate thrust, the efficiency is high, and the thrust is large. The dual-rotor motor direct-driven coaxial reverse propeller ducted fan propulsion unit is simple in mechanism, light in structure, large in power-to-weight ratio, high in reliability, beneficial to use in a narrow space and vertical take-off and landing, especially suitable for an EVTOL (electric vertical take-off and landing aircraft), and capable of promoting popularization of small aircrafts and vertical take-off and landing urban transportation carriers.

The invention discloses a water-rich broken surrounding rock directional grouting method based on an external magnetic field. The method comprises the following steps that 1, geological exploration is conducted on a target water-rich broken surrounding rock area; step 2, mixing the base material, the nano ferroferric oxide magnetic particles, the rheology regulating agent, the dispersing agent and the coagulation accelerator according to a mass ratio; 3, injecting alternating current with the frequency of 50-500Hz into the electromagnetic coil to generate a rotating magnetic field with the intensity of 3-10kA / m, and driving the slurry to directionally migrate along the main fracture area; 4, the grouting pressure of the pre-buried pressure sensor is monitored in real time, when the pressure change rate delta P / delta t is larger than or equal to 0.1 MPa / min, the electromagnetic coil injection frequency is switched to alternating current of 1 kHz to 10 kHz, so that the intensity of a magnetic field is improved to 8 kA / m to 15 kA / m, and grouting on the micro-crack area is enhanced; and 5, when the pressure change rate delta P / delta t is smaller than + / -0.1 MPa / min and lasts for 5-10 min, grouting operation is ended. The method aims at solving the problems that in grouting reinforcement of the water-rich fractured stratum, slurry is lost along with water flow, micro-cracks are difficult to fill, and reinforcement bodies are distributed unevenly.

The invention belongs to the technical field of infrared thermal imaging defect detection, and particularly discloses an in-situ infrared thermal imaging detection device based on low-frequency modulation magnetic field excitation, which comprises a magnet yoke, an infrared thermal imager, a computer, a modulation power supply and an excitation coil group, the excitation coil group at least comprises a first excitation coil, a second excitation coil, a third excitation coil and a fourth excitation coil; the modulation power supply respectively introduces low-frequency alternating currents with different phases and direct currents with different directions into the first excitation coil, the second excitation coil, the third excitation coil and the fourth excitation coil; through composite excitation of an orthogonal direct-current magnetic field and a low-frequency rotating alternating-current magnetic field, the device can form a rotating low-frequency alternating-current magnetic field in a to-be-detected pipeline, the rotating magnetic field uniformly sweeps a detection area in a plurality of periods, the influence of eddy current distribution direction sensitivity is eliminated, and large-area uniform heating is realized; the problem of low efficiency of a traditional spot scanning or line scanning mode is avoided, and the coverage area of single detection is remarkably increased.

The invention provides a flywheel energy storage system with an electromagnetic coupler, which comprises a motor, a flywheel rotor, the electromagnetic coupler, a frequency converter and a generator, and is characterized in that the motor is connected with the flywheel rotor to drive the flywheel rotor to rotate, the electromagnetic coupler comprises an outer rotor and an inner rotor, and the outer rotor sleeves the inner rotor and is spaced from the inner rotor; the flywheel rotor is in transmission connection with the inner rotor, the inner rotor generates a rotating magnetic field to drive the outer rotor to rotate, and the frequency converter is connected with the outer rotor to change the current frequency of the outer rotor so as to change the magnetic field rotating speed matched with the current, so that the mechanical rotating speed of the outer rotor is kept constant. The generator generates power, accesses the power grid and inputs electric energy with stable frequency into the power grid, the requirement of power transmission to the power grid is met, power electronic devices are not needed, rotational inertia in the power grid can be improved, necessary voltage and frequency support is provided for the power grid, and the capacity of the power grid for efficiently accepting new energy is improved.

The present invention relates to the technical field of motors, and discloses a frameless torque motor, which includes a stator for generating a rotating magnetic field. A plurality of stator slots are equidistantly arranged on the inner wall of the stator, and a stator winding is arranged between two adjacent stator slots. A rotor is used to generate a rotational motion under the action of the rotating magnetic field of the stator. The rotor is arranged inside the stator and concentric with it, and an air gap is arranged between the rotor and the stator. When the rotor rotates clockwise or counterclockwise, through the cooperation of the heat dissipation component and the air supply component, the fan blades rotate a certain angle left and right, so as to drive the air flow into the cavity formed by the mounting plate, the lower cover plate, the heat dissipation box and the air gap, thereby enabling the air flow to dissipate heat and cool the stator and the rotor, avoiding damage to the frameless torque motor due to overheating during long-term operation, and ensuring the normal operation of the frameless torque motor.

To provide a rotor structure capable of efficiently cooling a cooling target part inside a synchronous motor.SOLUTION: A rotor structure that supplies oil to a cooling target part inside a synchronous motor in which a rotor 10 rotates synchronizing with a revolving magnetic field generated in a stator is provided. The rotor 10 includes a plurality of permanent magnets 101, 102, 103, and 106, which is one cooling target part, and a cylindrical rotor core 30 in which a plurality of magnet holes 31 for having the permanent magnets 101 and 102 embedded therein are formed. The rotor 10 is configured so that the oil flows in an axial direction inside the rotor core 30, passing through the plurality of magnet holes 31.SELECTED DRAWING: Figure 4

A tunnel magnetoresistive (TMR) multi-turn (MT) sensor can include sensing elements which can be provided with two or more electrical contacts for performing current-in-plane tunnelling measurements. The two or more electrical contacts may be provided above or below the TMR sensing elements. One or more read-out pillars formed from TMR sensing material may be provided, the read-out pillars being electrically connected to one or more TMR sensing elements. The read-out pillars can be configured such that the resistance observed in the read-out pillars is negligible or near-negligible relative to that observed in the TMR sensing elements, such that the measured output signal only reflects the change in resistance experience by the TMR sensing elements in the presence of an externally rotating magnetic field.

The present invention relates to the field of magnetron sputtering technology, and specifically discloses a magnetron sputtering silver-coated conductive material powder device based on an ultrasonic-electromagnetic suspension composite dispersion system and its application. In response to the technical difficulties of powder agglomeration, low target utilization rate and poor uniformity in large-scale production, the present invention uses a porous ceramic tooling disk as the core carrier, integrates a high-frequency ultrasonic vibrator array (adjustable at 20-100kHz), a planar rectangular cathode (tilt angle 0-15°) and a Helmholtz coil (0.1-0.5T rotating magnetic field), and realizes non-contact dispersion of powder and precise coating of silver layer through cavitation effect, electromagnetic suspension and multi-target collaborative sputtering. The tooling disk adopts a gradient aperture design, combined with liquid nitrogen microchannel cooling and modular cavity structure, so that the powder dispersion uniformity (CV value <5%), silver layer porosity (<1%), target utilization rate (52%) and single furnace production capacity (72kg / 8h) are significantly optimized, providing an efficient and environmentally friendly industrial solution for the field of electronic materials.

For an electric motor which has a stator which is set up to generate a rotating magnetic field, and which also has a rotor which is mounted rotatably about a rotation axis and which carries a number of permanent magnets, it is provided, in order to increase the electrical efficiency but also to reduce vibrations during operation, that a stator winding is inserted into slots of the stator and energized with a multiphase current in such a way that the stator forms a magnetic field which is characterized by a number NU of primary areas and that at most five of the slots of the stator are used per primary area. Preferably at least seven, particularly preferably at least eight or even at least ten primary areas can be formable or formed along the circumference of the stator when the stator winding is energized accordingly.

The invention provides an angular displacement measurement method and system based on diamond quantum sensing, and relates to the field of quantum sensing, and the method comprises the steps: taking a diamond NV color center as a probe, placing the probe in a magnetic field and a static magnetic field which rotate at a constant speed, and carrying out the coaxial rotation with a to-be-measured object, the diamond NV color center of the system is measured by adopting continuous light excitation and microwave radiation based on diamond quantum sensing angular displacement; acquiring a first fluorescence signal emitted by the diamond NV color center at a first moment, and outputting a corresponding first traveling wave signal; acquiring a second fluorescence signal emitted by the diamond NV color center at a second moment, and outputting a corresponding second traveling wave signal; and based on the phase difference between the first traveling wave signal and the second traveling wave signal, determining the angular displacement value of the rotation of the object to be measured of the angular displacement measurement system based on diamond quantum sensing. According to the embodiment of the invention, the diamond NV color center is highly sensitive to the change of the magnetic field, and the measurement precision of angular displacement can be improved.

The invention discloses automatic magnetic polishing and separating equipment which comprises a rack, a magnetic polishing machine and a magnetic separator. The magnetic polisher comprises a polishing barrel and a first rotating magnetic field device, the first rotating magnetic field device is arranged on the rack, and the bottom of the polishing barrel is arranged at the top of the first rotating magnetic field device; the magnetic separator comprises a separation barrel and a second rotating magnetic field device, the second rotating magnetic field device is arranged on the rack, and the bottom of the separation barrel is arranged at the top of the second rotating magnetic field device; a separation chamber and a recovery chamber located below the separation chamber are arranged in the separation barrel, filtering holes allowing magnetic grinding materials in the separation chamber to enter the recovery chamber are formed in the separation barrel, and an overturning device is arranged on the rack and used for overturning the polishing barrel so that workpieces and the magnetic grinding materials in the polishing barrel can be poured into the separation chamber. Magnetic polishing and magnetic separation are integrated, automation of the whole process of magnetic polishing and magnetic abrasive and workpiece separation after polishing is achieved, and production efficiency and stability of polishing quality are guaranteed.

The invention discloses a process method for preparing high-spinning nano pyrite through physical field-chemical method coupling regulation and control, which comprises the following steps: dissolving bovine serum albumin in deionized water, adding an iron source, uniformly mixing, adjusting the pH value of the solution to 10.0-11.0, adding a sulfur source, and uniformly mixing, thereby obtaining the high-spinning nano pyrite. Carrying out a coupling regulation reaction of a physical field and a chemical method on the reaction system under the protection of inert gas, and then dialyzing and purifying to prepare the high-spin-state FeS2 nanosheet. The chemical method comprises one or more of a coprecipitation method, a solvothermal method and a hydrothermal method; the physical field comprises one or more of an alternating magnetic field, a static magnetic field and a rotating magnetic field. Through coupling regulation and control of a physical field and a chemical method, accurate conversion of the FeS2 nanosheet from a low spinning state to a high spinning state is realized, chemical doping can be effectively avoided, natural biological suitability of FeS2 is reserved, and the method has a good clinical conversion application prospect.

The invention discloses a helium magnetocaloric phase change circulation power device which comprises a liquid helium tank, a plunger pump, a helium compressor, a heat exchange tank, a first surge tank, a countercurrent heat exchanger, a second surge tank and a turbo expander. Liquid helium and gas helium are stored in the liquid helium tank; the plunger pump is used for pressurizing liquid helium in the liquid helium tank to set pressure; the heat exchange tank internally comprises a magnetocaloric working medium, a rotating magnetic field, a cold source helium heat exchange pipeline and a heat source helium heat exchange pipeline, and the magnetocaloric working medium based on the magnetocaloric inverse heat effect is used as a medium, so that a heat source and cold and heat source helium are subjected to inverse heat exchange; the first surge tank and the second surge tank are used for stabilizing the inlet and outlet air pressure of the expansion machine so as to stabilize the working efficiency of the expansion machine; the countercurrent heat exchanger is used for carrying out heat exchange on high-pressure helium output by the first surge tank and a heat exchange medium for absorbing environmental heat energy; the expansion machine is used for converting heat energy of gas into mechanical energy and then converting the mechanical energy into electric energy through the generator, and recycling of environment low-temperature heat energy is achieved.