90 results about "Rare-earth magnet" patented technology

The invention relates to the technical field of intelligent sintering, and discloses a rare earth magnet intelligent sintering production line and a control system, and the system comprises a temperature data collection module, a temperature gradient evaluation module, a temperature change rate fitting module, a heating power adjustment module, a directional heat energy compensation module and an optimized heating instruction generation module. Temperature distribution information in the sintering furnace is obtained; evaluating real-time temperature gradients of different positions in the sintering furnace, and comparing the real-time temperature gradients with a preset gradient threshold value to identify a temperature abnormal region in the sintering furnace; fitting the temperature change rate of the temperature abnormal area; the material phase change critical parameters of the rare earth magnet in the current sintering stage are combined to adjust the heating power of the temperature abnormal area; performing directional heat energy compensation on the temperature abnormal region to obtain a power compensation amount; superposing the power compensation amount and the reference power of the sintering furnace to generate an optimized heating instruction; the intelligent sintering control efficiency of the rare earth magnet can be improved.

Provided is a rare earth magnet and a method for manufacturing the same, which achieve both high magnetic properties and low eddy current loss. A rare earth magnet comprises coated magnet powder particles, each comprising a flake-shaped rare earth magnet powder particle and an insulating material coating provided thereon. In a plane perpendicular to a magnetization direction of the rare earth magnet, the rare earth magnet powder particles have a shorter average dimension in a first direction than an average dimension in a third direction perpendicular to the first direction. Its manufacturing method comprises a first molding operation including applying pressure to the coated magnet powder particles in the first direction to produce a first molded product, and a second molding operation including applying pressure to the first molded product in a second direction that intersects with the first direction, causing plastic deformation to produce the rare earth magnet.

A vehicle drive system includes a motor that has a cylindrical stator and a cylindrical rotor provided in the stator to be coaxially rotatable with a center axis of the stator and drives a front wheel of a vehicle by rotation of the rotor. The rotor has a cage section and a permanent magnet section provided on an inner circumferential side of the cage section and formed of a rare earth magnet. The vehicle drive system further includes a controller that executes a synchronous operation mode when a temperature of the permanent magnet section is lower than a predetermined temperature, and executes an asynchronous operation mode when the temperature of the permanent magnet section is equal to or higher than the predetermined temperature. In the synchronous operation mode, the rotor is rotated by using a magnetic force of the permanent magnet section.

Provided is a rare earth magnet alloy having a tetragonal R2Fe14B crystal structure, including: a main phase containing, as main constituent elements, at least one kind selected from the group consisting of: Nd; La; and Sm, Fe, and B; and a sub-phase containing, as main constituent elements, at least one kind selected from the group consisting of: Nd; La; and Sm, and O, wherein La substitutes for at least one of a Nd(f) site or a Nd(g) site, wherein Sm substitutes for at least one of a Nd(f) site or a Nd(g) site, wherein La segregates in the sub-phase, and wherein Sm is dispersed in the main phase and the sub-phase without segregation.

The present invention relates to a method of producing a composite component, the method including: preparing a second composite by fitting a first molded body onto a first composite including a rare earth magnet and a component contacting the rare earth magnet, such that the first molded body covers at least the entire surface of the first composite corresponding to the rare earth magnet; and forming a second molded body by inserting the second composite into a mold and injection-molding a thermoplastic resin such that the thermoplastic resin covers at least the entire surface of the first composite not covered by the first molded body and also contacts the first molded body.

The utility model relates to the technical field of metal processing, and discloses a metal processing waste chip cleaning structure which comprises an annular magnetic suction cup, a separating cylinder, a collecting box, an annular rare earth magnet, a spiral blade, a ball and a rotating mechanism. The top end of a separation cylinder is inserted into an inserting groove of an annular magnetic suction cup, an annular rare earth magnet is installed in the inner wall of the annular magnetic suction cup, a spiral blade is fixed in the separation cylinder, two sets of balls are arranged between the inserting groove of the annular magnetic suction cup and the periphery of the top end of the separation cylinder, and the rotating mechanism is arranged on the top face of the collecting box. The rotating mechanism comprises a motor, a gear and an outer gear ring; according to the metal machining waste chip cleaning structure, waste chips are efficiently adsorbed through the annular magnetic suction cup, friction is reduced in combination with rotary separation of the separation barrel and the spiral blades in the separation barrel and smooth movement of the balls in the roller path, and rapid cleaning and precise separation of the waste chips are achieved.

An electric motor includes a rotor having an iron core to which a rotary shaft extending in a shaft center direction is fixed, and a stator disposed to face the rotor. The stator includes a plurality of teeth extending to the rotor, and a slot positioned between adjacent teeth among the plurality of teeth. The iron core includes a plurality of magnet insertion holes and a plurality of permanent magnets disposed in the plurality of magnet insertion holes, respectively, and the plurality of permanent magnets are rare earth magnets. An outermost peripheral shape of the iron core corresponding to a magnetic pole of each of the plurality of permanent magnets includes a plurality of arcs having different radii, the number of poles of the rotor is greater than or equal to 10, and a residual magnetic flux density of the permanent magnet is greater than or equal to 1.3T.

This invention relates to the field of loudspeaker technology and discloses a loudspeaker assembly, including a diamond diaphragm. The diamond diaphragm includes a diaphragm body and a noble metal damping layer covering the diaphragm body. The outer edge of the diaphragm body is set as a folded edge at a preset angle. A frame is provided, with one end of the frame bonded to the folded edge by rigid adhesive. A magnetic circuit structure includes a rare earth magnet, a magnetic conductor, a copper cap, and a polarizing plate, with a receiving cavity provided inside the magnetic conductor. A voice coil is wound around the side of the frame near the magnetic conductor and located in the gap between the polarizing plate and the magnetic conductor. This application can extend the high-frequency response of the loudspeaker, improve the high-frequency performance of the loudspeaker, and enable it to reproduce ultra-high frequency audio signals more realistically and clearly, solving the shortcomings of existing loudspeakers in frequency response and distortion control in the ultra-high frequency range.

Provided are a rare earth magnet capable of suppressing deterioration of magnetic properties and a method for manufacturing the same. The rare earth magnet of the present invention comprises a magnet body containing a rare earth element R1, a transition metal element T, and boron B and comprising a main phase, wherein a region of a constituent surface constituting the surface of the magnet body near a corner of the magnet body is a machined surface obtained by removal processing, and a region of the constituent surface closer to the center than the region near the corner is a non-machined surface that has not been subjected to removal processing.

The invention describes a sintered rare earth magnet with a concentration of c of 8001,400 ppm, a maximum concentration of o of 1,000 ppm, and a maximum concentration of N of 800 ppm, a maximum average crystal grain size D50 of 4.5 ppm, and an orientation Or (%) determined by the formula: Or ” (Br / 47tfs)*100, in which D50 and Or satisfy the relationship: Or > 0f7*D5O+95. The sintered magnet shows both high values ​​of Br and HCJ.

The production method of a rare earth magnet of the present disclosure includes a coated magnetic powder preparation step, a mixed powder preparation step, and a pressure sintering step. In the coated magnetic preparation step, a zinc-containing coating 12 is formed on the particle surface of a samarium-iron-nitrogen-based magnetic powder to obtain a coated magnetic powder 14. In the mixed powder preparation step, a binder powder 20 having a melting point not higher than the melting point of the coating 12 and the coated magnetic powder 14 are mixed to obtain a mixed powder. In the pressure sintering step, denoting as T1° C. the temperature at which the peak disappears in an X-ray diffraction pattern of the binder powder 20 and as T2° C. the temperature at which the magnetic phase in the samarium-iron-nitrogen-based magnetic powder 10 decomposes, the mixed powder is pressure-sintered at T1° C. or more and (T2−50° C.) or less.

To provide an R-T-B-based rare earth magnet achieving both residual magnetization and coercive force.SOLUTION: The present invention relates to an R-T-B-based rare earth magnet in which R is a rare earth element, T is Fe and / or Co, and B is boron. R includes Nd. The R-T-B-based rare earth magnet includes a main phase having an R2T14B-type crystal structure and a grain boundary phase present around the main phase. The average grain size of the main phase is 0.1-1.0 μm. The main phase has a core portion and a shell portion present around the core portion. The ratio (concentration of Nd in shell portion / concentration of Nd in core portion) of the concentration of Nd (atom%) in the shell portion and in the core portion of the main phase is 1.654-1.714.SELECTED DRAWING: Figure 2

The application discloses a kind of magnetism guide enhancement repair processes for low heavy rare-earth magnetic steel, it is related to low heavy rare-earth magnetic steel repair field.The application discloses a kind of magnetism guide enhancement repair processes for low heavy rare-earth magnetic steel, it is related to low heavy rare-earth magnetic steel repair field.The application discloses a kind of magnetism guide enhancement repair processes for low heavy rare-earth magnetic steel, it is related to low heavy rare-earth magnetic steel repair field.The application discloses a kind of magnetism guide enhancement repair processes for low heavy rare-earth magnetic steel, it is related to low heavy rare-earth magnetic steel repair field.The application discloses a kind of magnetism guide enhancement repair processes for low heavy rare-earth magnetic steel, it is related to low heavy rare-earth magnetic steel repair field.The application discloses a kind of magnetism guide enhancement repair processes for low heavy rare-earth magnetic steel, it is related to low heavy rare-earth magnetic steel repair field.The application discloses a kind of magnetism guide enhancement repair processes for low heavy rare-earth magnetic steel, it is related to low heavy rare-earth magnetic steel repair field.The application discloses a kind of magnetism guide enhancement repair processes for low heavy rare-earth magnetic steel, it is related to low heavy rare-earth magnetic steel repair field.The application discloses a kind of magnetism guide enhancement repair processes for low heavy rare-earth magnetic steel, it is related to low heavy rare-earth magnetic steel repair field.The application discloses a kind of magnetism guide enhancement repair processes for low heavy rare-earth magnetic steel, it is related to low heavy rare-earth magnetic steel repair field.The application discloses a kind of magnetism guide enhancement repair processes for low heavy rare-earth magnetic steel, it is related to low heavy rare-earth magnetic steel repair field.The application discloses a kind of magnetism guide enhancement repair processes for low heavy rare-earth magnetic steel, it is related to low heavy rare-earth magnetic steel repair field.The application discloses a kind of magnetism guide enhancement repair processes for low heavy rare-earth magnetic steel, it is related to low heavy rare-earth magnetic steel repair field.The application discloses a kind of magnetism guide enhancement repair processes for low heavy rare-earth magnetic steel, it is related to low heavy rare-earth magnetic steel repair field.The application discloses a kind of magnetism guide enhancement repair processes for low heavy rare-earth magnetic steel

To provide a rare earth magnet powder capable of sufficiently improving bulk density and suitable for manufacturing an anisotropic magnet.SOLUTION: A rare earth magnet powder has an average sphericity P1 defined by the formula (1) of P1=Ls / Ll of 0.65 or more. In the formula (1), Ll is the length of the long side of the circumscribing rectangle having the smallest area with respect to the rare earth magnet powder in a microscope image, and Ls in the formula (1) is the length of the short side of the circumscribing rectangle having the smallest area with respect to the rare earth magnet powder in the microscope image.SELECTED DRAWING: Figure 1A

The present invention relates to a rare earth magnet and a method for manufacturing the same. A method for manufacturing a rare earth magnet and a rare earth magnet obtained by the method, the method comprising: preparing a magnetic powder of the Sm-Fe-N system; preparing a modified material powder containing metallic zinc; mixing the magnetic powder and the modified material powder to obtain a mixed powder; compression molding the mixed powder in a magnetic field to obtain a magnetic field formed body; pressure sintering the magnetic field formed body to obtain a sintered body; and heat treating the sintered body, wherein the content ratio of the metallic zinc in the modified material powder is 10 to 30% by mass relative to the mixed powder, and, regarding the conditions of the heat treatment, when the temperature and time are set to x°C and y hours, respectively, y≧-0.32x+136 and 350≦x≦410 are satisfied.

An assembly of rare earth magnet pieces is prepared by placing two rare earth magnet pieces at their side surfaces in abutment so that top surfaces of magnet pieces are disposed adjacent to each other across the abutment interface, and forming a coating on the adjacent surfaces of magnet pieces, the coating continuously extending across abutment interface and over adjacent surfaces for thereby tightly joining the abutted magnet pieces together.

The present invention relates to a rare earth magnet and a method for manufacturing the same. Provided is a Sm-Fe-N-based rare earth magnet which is less likely to demagnetize than ever before under an environment where an external magnetic field is applied, particularly at high temperatures, and a method for manufacturing the same. The method for manufacturing the rare earth magnet of the present disclosure includes: preparing a SmFeN magnetic powder; preparing a modifying material powder containing a zinc component; mixing the SmFeN magnetic powder and the modifying material powder to obtain a mixed powder; compression molding the mixed powder in a magnetic field to obtain a magnetic field molded body; pressure sintering the magnetic field molded body to obtain a sintered body; and subjecting the sintered body to heat treatment. The D 50 of the magnetic powder is 1.50 μm or more and 3.00 μm or less, the content ratio of the zinc component in the modifying material powder is 6 mass% or more and 30 mass% or less, and the heat treatment temperature is 350°C or more and 410°C or less.

The invention provides a rare earth magnet and a method of manufacturing the same. The rare earth magnet achieves high magnetic performance and low eddy current loss. The rare earth magnet includes coated magnet powder particles, each coated magnet powder particle including a rare earth magnet powder particle and an insulating material coating on a surface of the rare earth magnet powder particle, where the insulating material includes nanoparticles coated with the rare earth magnet powder particle. A method of manufacturing a rare earth magnet includes a coating operation including adding an insulating material to rare earth magnet powder particles such that each coated magnet powder particle includes a rare earth magnet powder particle and an insulating material coating layer on a surface of the rare earth magnet powder particle, wherein the coating operation comprises spraying a nanoparticle dispersion solution comprising nanoparticles and a binder to the rare earth magnet powder particles caused to roll and flow.

The invention relates to the technical field of functional composite materials, in particular to rare earth magnetic memory foam and a preparation technology thereof.The rare earth magnetic memory foam comprises a structural layer, a functional layer and a contact layer which are sequentially combined; the structural layer comprises an aerogel grid framework, and the aerogel grid framework is wrapped with a wrapping layer; the functional layer is made of a rare earth magnet and memory foam composite material; the contact layer is made of an aerogel and memory foam composite material, the contact layer is compounded with the memory foam through the aerogel, the air permeability of the memory foam is improved, the problem of stuffiness of traditional memory foam is solved, the functional layer forms a uniform magnetic field band through directional arrangement of rare earth magnetic powder, local blood circulation can be improved in an auxiliary mode, and the magnetic field health care function is achieved; the supporting performance of the structural layer is enhanced by means of an aerogel grid framework, and collapse caused by long-term use is avoided; the contact layer, the functional layer and the structural layer cooperate to form a unified system with comfortable contact, effective health care and stable supporting, and the problems that traditional memory foam is single in function, stuffy and insufficient in supporting are solved.

A device for insulation resistance testing of an electrical circuit comprises a pair of electrical cables 12, 14, each cable coupled at one end to a connector 18a, 18b configured to be connected to an

To provide a non-reciprocal circuit element for use in the 3 GHz to 6 GHz band.SOLUTION: A non-reciprocal circuit element includes a ferrimagnetic material having a main surface, multiple central conductors arranged on the main surface of the ferrimagnetic material while being insulated from one another, and a laminated magnet formed by stacking ferrite magnets and rare earth magnets containing Sm, and the laminated magnet is arranged facing the multiple central conductors, and the composite temperature coefficient of the remanence of the laminated magnet is between -0.14% / °C and -0.06% / °C, and the slope of the temperature coefficient of the saturation magnetic flux density of the ferrimagnetic material is half or less.SELECTED DRAWING: Figure 1

A single-sided magnet and magnetic resonance imaging (“MRI”) system are portable and lightweight, enabling use as a point-of care (“POC”) MRI device. The portable MRI system includes a magnet assembly containing layers of magnet blocks, such as rare-earth magnet blocks. The magnet blocks are arranged in concentric rings in each layer, and surround a central aperture extending through the magnet assembly. The central aperture is sized to allow a medical instrument, such as a needle, to pass through the central aperture. The portable MRI system can therefore be used for image guidance in lumbar puncture (“LP”) and other medical procedures.

Provided is a rare earth magnet that allows suppressing deterioration of magnetic properties and a method for manufacturing the same. The rare earth magnet of the present disclosure includes a magnet body containing a rare earth element R1, a transition metal element T, and boron B and includes a main phase. A region in the vicinity of a corner portion of the magnet body of a constituent surface constituting a surface of the magnet body is a processed surface on which a removal process has been performed, and a region closer to a center than the region in the vicinity of the corner portion of the constituent surface is a non-processed surface on which the removal process is not performed.

Provided is a rare earth magnet capable of improving both residual magnetization and coercive force. The rare earth magnet of the present disclosure includes: a main phase; and a grain boundary phase present around the main phase. A total composition in atomic ratio is represented by the formula R1xT(100−x−y−z)(B(1−s)Cs)yMz, R1 is one or more elements selected from the group consisting of Nd, Ce, La, Pr, Gd, Tb, Dy, and Ho, T is one or more elements selected from the group consisting of Fe, Co, and Ni, M is one or more elements selected from the group consisting of Ga, Al, Cu, Au, Ag, Zn, In, and Mn and unavoidable impurity elements, and 12.0≤x≤20.0, 5.00≤y≤20.0, 0≤z≤2.0, and 0.07≤s≤0.17 are satisfied. The main phase has a crystal structure of R2Fe14B type, and R is a rare earth element.

To provide an R-T-B-based rare earth magnet with an excellent magnetic property.SOLUTION: The present invention relates to an R-T-B-based rare earth magnet in which R is a rare earth element, T is Fe and / or Co, and B is boron, the carbon arrangement in the R-T-B-based rare earth magnet being adjusted.SELECTED DRAWING: Figure 1

A Sm—Fe—N-based rare earth magnet more resistant to demagnetization than ever before, particularly at high temperatures, and a production method thereof are provided.The present disclosure presents a production method of a rare earth magnet, including mixing a SmFeN magnetic powder and a modifier powder to obtain a mixed powder, compression-molding the mixed powder in a magnetic field to obtain a magnetic-field molded body, pressure-sintering the magnetic-field molded body to obtain a sintered body, and heat-treating the sintered body, and a rare earth magnet obtained by the method. D50 of the magnetic powder is 1.50 μm or more and 3.00 μm or less, the content ratio of the zinc component in the modifier powder is 6 mass % or more and 30 mass % or less, and the heat treatment temperature is 350° C. or more and 410° C. or less.

Provided is an Sm—Fe—N rare earth magnet comprising Sm—Fe—N crystal grains. An oxygen content in the Sm—Fe—N rare earth magnet is 0.5% by mass or less on the basis of a total amount of the Sm—Fe—N rare earth magnet, and an average grain size of the Sm—Fe—N crystal grains is 1 μm or less.

Provided is a rare earth magnet obtained by subjecting an R—Fe—B-based alloy containing R, wherein R represents a rare earth element containing Nd, Fe, and B to hot plastic processing. The rare earth magnet has a structure of a main phase containing an R2Fe14B compound, an axis of easy magnetization is oriented in a minor axis direction of a crystal grain of the main phase, a thickness dimension in a direction of the axis of easy magnetization is from 0.07 mm to 0.2 mm, and a decrease rate of residual magnetization is 5% or less, wherein the decrease rate (%) of residual magnetization is a rate of decrease in residual magnetization with respect to when residual magnetization of the rare earth magnet having the thickness dimension of 0.5 mm is defined as 100%.

According to an embodiment, a rotor (100) comprises: a rotor shaft (110); a rotor core (120) having a plurality of flux barrier bands (120x, 120y) formed at intervals in the radial direction at respective magnetic poles (101) and in a substantially convex shape toward a rotational central axis; and, in each of the flux barrier bands, a plurality of permanent magnets 130 that include rare earth magnets not containing a heavy rare earth element and / or heavy rare earth magnets containing a heavy rare earth element and are arranged in line symmetry with respect to an M-axis. When viewed with regard to the flux barrier band (120y), in which both rare earth magnets and heavy rare earth magnets are stored, the rare earth magnets are thicker in a direction of magnetization than the thickness of the heavy rare earth magnets in the direction of magnetization, and are also disposed on the side close to the M-axis.