241 results about "Magnetic characteristic" patented technology

The invention relates to the technical field of magnetic ring detection, discloses a magnetic ring multi-dimensional nondestructive detection system and method based on multi-frequency composite electromagnetic excitation, and solves the defects of existing magnetic ring detection in the aspects of information acquisition, composite excitation and comprehensive diagnosis. The method comprises the following steps: applying multi-frequency composite excitation, and collecting and preprocessing multi-dimensional response; and extracting features, and carrying out deep learning fusion inversion to obtain magnetic characteristics, material components and defect information. The system comprises a composite excitation module, a multi-mode sensing module, a data acquisition preprocessing module, a data fusion inversion module and a control module. By adopting the technical scheme, comprehensive and efficient nondestructive detection of multi-dimensional electromagnetic information of the magnetic ring is realized, the existing limitation is overcome, and the detection precision and the comprehensive diagnosis capability are remarkably improved.

The invention discloses a nonlinear correction method, device and equipment for excitation characteristics of a mutual inductor, and particularly relates to the technical field of mutual inductors. The method comprises the following steps: acquiring original data corresponding to a mutual inductor, wherein the original data comprises an original current signal, historical magnetic flux and distributed temperature data; performing noise reduction processing on the original current signal to obtain a purified current signal, and determining a magnetic conductivity correction coefficient and a temperature gradient according to the distributed temperature data; inputting the purification current signal and the magnetic conductivity correction coefficient into a hysteresis model to obtain a real-time magnetic flux, and inputting the purification current signal, the distributed temperature data, the temperature gradient and the historical magnetic flux into a magnetic flux correction network to obtain a magnetic flux correction value; and compensating the real-time magnetic flux according to the magnetic flux correction value to obtain a corrected magnetic flux result of the mutual inductor. According to the invention, multi-physical field fusion input can be realized, transient response can be improved, harmonic distortion compensation can be carried out, and high precision of data can be maintained.

This application relates to the field of motor technology, specifically to a stator assembly and a motor. The stator assembly includes: a stator core, comprising a stator yoke and multiple stator teeth, the multiple stator teeth being spaced circumferentially along the inner surface of the stator yoke, with a receiving groove formed between two adjacent stator teeth, the receiving groove having an opening located at the end of the receiving groove away from the stator yoke; and a cover, which is disposed on the opening, and the cover is a magnetically conductive material. By configuring the cover as a magnetically conductive material, the cover has magnetically conductive characteristics. Utilizing the magnetically conductive characteristics of the cover, the air gap magnetic permeability distribution is made more uniform, thereby effectively reducing the harmonic content of the air gap magnetic field and thus reducing eddy current losses.

This invention discloses a modeling method for a proxy model of a permanent magnet synchronous motor under eccentric conditions. First, a mathematical model of the eccentric motor proxy model is established, including the permanent magnet flux linkage and no-load back EMF, flux linkage model, voltage model, electromagnetic torque, and torque balance equations. Then, no-load back EMF, permanent magnet flux linkage, and dq-axis inductance data are obtained through finite element simulation, and harmonic fitting is performed on the permanent magnet flux linkage. Next, a multi-dimensional parameterized lookup table covering eccentricity type and degree, speed, torque, and rotor position angle is constructed. The lookup table and interpolation algorithm are integrated into the simulation platform to form a high-fidelity proxy model module that can be called in real time. Finally, the model accuracy is verified by comparison with finite element simulation and experimental data. This invention achieves high-precision and rapid mapping of the electromagnetic characteristics of eccentric motors, balancing modeling accuracy, efficiency, and versatility.

The present invention can provide a non-oriented electrical steel sheet having improved surface properties and magnetic properties, and another aspect provides a method for manufacturing the non-oriented electrical steel sheet.

The present application belongs to the field of magnetic nanoparticle measurement, and particularly relates to a high-sensitivity magnetic nanoparticle spectrometer and a waveform signal conversion method thereof, and aims to solve the problem that the dynamic magnetic characteristics of low-concentration magnetic nanoparticles cannot be quantitatively evaluated in the prior art. The present application comprises a driving module, a switching module, a current sampling module, a band-pass filtering module, a rectifying module, a current control module, a voltage adjustment module, a coil matching module, a coil assembly, a receiving coil signal processing module, a signal acquisition analog block, and a main control calculation module. According to the target current demand, the coil matching module can be flexibly edited, and further, the control signal for driving the coil can be automatically generated according to the matched driving circuit and the target waveform, wherein the data acquisition-processing link can restore the waveform and obtain the original spectrum of the magnetic particles through the built-in calculation steps. At the same time, the current compensation loop contained in the present application can compensate the current error caused by factors such as coil temperature rise, parameter drift of the matching module, and change of the on-resistance of the switching module, so as to ensure the constant output of the target harmonic current.

The invention provides a treatment method and device for intelligently and comprehensively utilizing solid waste of a thermal power plant, and relates to the technical field of resource utilization of the solid waste of the thermal power plant, and the method comprises the steps that a multi-mode sensor array detects the particle size, components and magnetic characteristics of the solid waste in real time, and slag, fly ash and desulfurized gypsum are classified through a machine learning model; constructing a virtual model by means of digital twinning, optimizing a melting temperature parameter through deep reinforcement learning, uploading monitoring data to a cloud end through edge calculation, and triggering process adaptive adjustment; iron elements are recycled by a wet high-gradient magnetic separator, copper and aluminum metals are extracted by smelting reduction of non-magnetic slag, and a composite building material is prepared from residues or 5-25mm inert slag is used as a road base; rare metals such as vanadium, titanium and nickel are extracted from residual slag through acid leaching, leaching liquid is subjected to solvent extraction or ion exchange enrichment, processing data are stored through a block chain, and traceability of the whole life cycle is achieved. The comprehensive resource utilization rate of the solid waste of the thermal power plant is remarkably improved, and meanwhile the overall treatment energy consumption is reduced.

The invention belongs to the technical field of superconducting motor testing, and particularly relates to a background magnetic field simulation and testing device for motor superconducting coil quench detection and electromagnetic characteristic analysis. The device comprises an outer stator iron core, an inner stator iron core, an open type or closed type low-temperature container with a built-in superconducting coil device, and a device bracket, wherein the outer stator iron core and the inner stator iron core are coaxially arranged; the outer stator is composed of an outer stator iron core and a multi-phase armature winding embedded in a tooth groove of the outer stator iron core. The inner stator iron core is composed of an even-number-pole iron core salient pole and a pole shoe, and an air gap is formed between the two; the low-temperature container can be of an open structure or a closed structure, and can be flexibly selected according to different test requirements; symmetrical alternating current is introduced into the multi-phase armature winding of the outer stator to simulate the background magnetic field environment of the superconducting coil in motor operation, effective verification and quantitative analysis of the quench characteristic and the electromagnetic performance of the superconducting coil are realized, related tests can be completed without manufacturing a prototype, the experiment cost is remarkably reduced, and the safety and the reliability are improved.

The application discloses a natural gas pipeline stress detection method, device, equipment and storage medium, and belongs to the technical field of natural gas pipeline safety monitoring. The method comprises the following steps: establishing a saturated magnetic field in a target detection section of a natural gas pipeline; collecting magnetic flux density, spatial difference signals, internal pressure and temperature in the saturated magnetic field; correcting and interference suppressing the collected data; inputting the processed data into a magnetic-force coupling model to establish the correlation between the pipeline stress and the magnetic flux density and the magnetization parameters; sequentially compensating the magnetic flux density based on the temperature and the strain rate; and finally combining the correlation to construct an inversion cost function, inputting the compensated data to obtain the pipeline stress distribution of the target section. The application does not need to invade the inside of the pipeline, guarantees the stable correlation between the magnetic characteristics and the stress through the saturated magnetic field, eliminates the environmental and dynamic factor interference through double compensation processing, significantly improves the stress detection accuracy, and can provide data support for the safe operation and risk early warning of the natural gas pipeline.

The application relates to the technical field of function test, and discloses a stress measurement system for spring fatigue state, which comprises an excitation unit, a sensing unit and a signal processing unit. The excitation unit applies an alternating excitation magnetic field to the spring to generate a stress-modulated induced electromotive force signal. The sensing unit collects magnetic characteristic parameters by using a quadrature differential sensing structure. The signal processing unit obtains phase components in a tangential signal and a radial reference signal, calculates a dynamic spiral angle deflection based on a phase difference, determines a dynamic differential compensation coefficient to extract a tangential principal stress component and compensate for a magnetic flux leakage vector deviation. Through a space posture modulation and lift gap fluctuation suppression mechanism, the application realizes dynamic alignment of a sensor measurement main shaft and a spring stress tensor main shaft, effectively eliminates geometric deflection errors caused by large amplitude deformation, and ensures that the system has high signal-to-noise ratio and baseline stability under cyclic load.

A stator core (21) provided with a plurality of divided cores (30) is configured by stacking core pieces (40) made of electromagnetic steel sheets, the electromagnetic steel sheets being prescribed electromagnetic steel sheets, and either of the radial direction of teeth (41) of the core pieces (40) of at least one of the plurality of divided cores (30) and the extension direction of a core back (42) is along a direction in which the magnetic properties of the electromagnetic steel sheets are excellent.

The invention relates to the technical field of power system simulation, in particular to a twelve-phase synchronous motor VBR modeling method, which comprises the steps of motor grouping modeling; integrating a magnetic saturation effect; and interphase coupling modeling. The method has the advantages that the VBR model is successfully expanded to a twelve-phase (four-group three-phase) synchronous motor, the limitation that a traditional three-phase model and a traditional six-phase model cannot be directly applied to a high-phase-number asymmetric motor is overcome, the coordinate transformation problem caused by a complex winding structure is effectively solved through the multi-stator modeling framework and the projection matrix technology, and the method is suitable for large-scale popularization and application. An effective modeling solution is provided for high-phase-number motor simulation; by introducing a differential inductance matrix and a magnetization coupling matrix into a dq0 coordinate system, the model can accurately describe electromagnetic characteristics of the motor in different saturation states; the model considers the mutual coupling effect among all three-phase units, solves the problem that a traditional model is difficult to accurately simulate complex magnetic saturation and interphase coupling of a twelve-phase motor, and remarkably improves the simulation precision.

The invention belongs to the technical field of degaussing, and relates to a ship winding degaussing current solving method based on a gradient tensor, which comprises the following steps: acquiring the magnetic gradient tensor of a plane ship when coils are not electrified; respectively performing simulation electrification on the winding coils to obtain the magnetic gradient tensor of the electrified measurement plane; and calculating an efficiency matrix of the magnetic gradient tensor excited by the unit current. The gradient of the geomagnetic field is extremely small, direct detection of the magnetic gradient tensor of the ship and the electrified coil can better reflect the magnetic characteristics of the ship and the coil compared with detection of a magnetic vector, and better resolution is achieved for magnetic field changes caused by magnetic anomalies; under the motion platform, the magnetic gradient tensor is insensitive to the attitude angle error, and more accurate detection data can be obtained; in addition, the gradient tensor is weak in response to time-varying geomagnetic disturbance, and has higher anti-interference capability. Therefore, according to the method, the accuracy of ship magnetic field modeling and degaussing current calculation is improved, and the magnetic stealth performance of a ship facing high-sensitivity magnetic gradient detection equipment is enhanced.

Provided are a composite metal magnetic body, an inductor, a method for manufacturing a composite metal magnetic body, and a method for manufacturing an inductor that enable an improvement in magnetic characteristics. A composite metal magnetic body CP according to the present disclosure comprises metal magnetic particles DP containing Fe, Ni, and Al, and an insulating coating film (oxide coating film OL) covering the metal magnetic particles DP, wherein: the plurality of metal magnetic particles DP are bonded together by means of the insulating coating film; the metal magnetic particles DP have Al agglomeration regions A1 inside which Al is agglomerated; and a peak derived from an FeAl phase and a peak derived from an FeNi phase are present in X-ray diffraction.

A magnetic property acquisition unit detects an induced voltage caused by vibration of a measurement sample magnetized by an excitation electromagnet and acquires a magnetic property that indicates a relationship between a magnetic flux density and an external magnetic field. The magnetic flux density is a sum of magnetization of the measurement sample and the external magnetic field. When acquiring the magnetic property of the measurement sample to which pressure is being applied, a control device sets a first magnetic field value as a sweep start value, and performs sweeping with a magnetic field equal to or less than the first magnetic field value. The first magnetic field value is smaller than a second magnetic field value that is acquired before the pressure is applied to the measurement sample, and corresponds to a saturation magnetic flux density of the measurement sample to which the pressure is not being applied.

The application discloses a current transformer magnetic characteristic test system and method and a computer program product, wherein the system comprises an original data acquisition module, a data feature generation module, a quality index evaluation module, a high load performance test module and a threshold correction determination module; core parameters are obtained by dynamically adjusting a sampling strategy, a feature vector is generated after preprocessing, a multilayer convolutional neural network model is used to mine parameter nonlinear correlation and output a quality index; a quality evaluation correction value is generated by combining temperature rise and noise data under a high load condition, an evaluation threshold is dynamically corrected, and test result determination is realized. The application effectively solves the problems of high misjudgment rate of static threshold determination in the prior art, difficulty in capturing parameter nonlinear correlation and inability to predict long-term stability, significantly improves the precision and reliability of magnetic characteristic test, accurately predicts the long-term full-load operation stability of equipment, and provides a reliable basis for power system core equipment selection and safe operation.

This invention belongs to the field of magnetic material measurement technology, and particularly relates to a power amplifier gain control method and system for magnetic characteristic measurement. The method includes the following steps: calculating the instantaneous rate of change of magnetization impedance at each moment, where the instantaneous rate of change of magnetization impedance is positively correlated with the time derivative of the ratio of output voltage to excitation current; calculating the dynamic load margin at each moment, where the dynamic load margin is negatively correlated with the instantaneous rate of change of magnetization impedance and positively correlated with the difference between the power amplifier's supply rail voltage and output voltage amplitude; determining the gain scaling factor at each moment, where the gain scaling factor is positively correlated with the dynamic load margin and its value ranges between a set upper and lower gain limit; and using the gain scaling factor to adjust the drive voltage command in real time to control the power amplifier's output gain, which can effectively improve the accuracy of power amplifier gain control for magnetic characteristic measurement.

Provided are: a nanocrystal alloy soft magnetic powder which optimizes the particle shape and particle size distribution and exhibits good filling properties and magnetic properties; a dust core which contains the powder and has high magnetic permeability and low iron loss; a magnetic element; and an electronic device. The nanocrystal alloy soft magnetic powder is represented by the composition formula FeaCubNbc (Si1-x (B1-yCry) x) 100-a-b-c-dSd [a, b, c, d, x, and y satisfy 75.5 < = a < = 79.5, 0.3 < = b < = 2.0, 2.0 < = c < = 4.0, 0.001 < = d < = 0.080, 0.55 < = x < = 0.91, and 0 < = y < = 0.185, expressed in atomic ratio. [1, 2, 3], and an impurity composition, and contains crystal grains of 1.0 nm to 30.0 nm, a particle size D10 of 7.0 [mu] m to 15.0 [mu] m, and a particle size D50 of 22.0 [mu] m to 32.0 [mu] m.

The invention relates to the technical field of electromagnetic functional materials, and provides a frequency-band-adjustable ferromagnetic core-shell nanorod wave-absorbing material and a preparation method thereof.The preparation method comprises the steps that an iron oxyhydroxide precursor is prepared through a hydrothermal synthesis method, the iron oxyhydroxide precursor is reduced through a liquid-phase pyrolysis method, and nanorod-shaped ferroferric oxide is obtained; growing a carbon layer on the surface of the nanorod-like ferroferric oxide through a high-temperature sintering method to obtain the nanorod-like ferroferric oxide composite material coated with the ultrathin carbon layer; and carrying out orientation arrangement on the nanorod-like ferroferric oxide composite material coated with the ultrathin carbon layer through magnetic field control. According to the invention, cooperation of structural design and light weight, improvement, regulation and control of electromagnetic characteristics and improvement of electromagnetic wave absorption efficiency can be realized.

The application belongs to the technical field of superconducting motor testing, and more particularly relates to a background magnetic field simulation and testing device for superconducting coil quench detection and electromagnetic characteristic analysis of a motor. The device comprises coaxially arranged outer and inner stator cores, an open or closed cryogenic container with a built-in superconducting coil device, and a device support; the outer stator is composed of an outer stator core and multiphase armature windings embedded in the tooth slots of the outer stator core; the inner stator core is composed of an even-pole core salient pole and a pole shoe, and an air gap is formed between the two; the cryogenic container can be of an open structure or a closed structure, and can be flexibly selected according to different testing requirements; by passing a symmetric alternating current into the multiphase armature windings of the outer stator, the background magnetic field environment of the superconducting coil in the motor operation is simulated, effective verification and quantitative analysis of the superconducting coil quench characteristics and electromagnetic performance are realized, the related tests can be completed without manufacturing a prototype, and the experimental cost is significantly reduced, and the safety and reliability are improved.

The application relates to a special device and method for detecting the magnetic field and temperature of a transcranial magnetic stimulation therapeutic instrument, wherein the special device comprises a bionic head model, a special support, a magnetic field measuring probe, a temperature measuring module, a device host, a control computer and a data line; the bionic head model is arranged at the bottom of the special support, the magnetic field measuring probe is arranged at the top of the special support, and the device host is connected with the magnetic field measuring probe, the temperature measuring module and the control computer through the data line. The method is characterized in that a bionic head model equivalent to the electromagnetic characteristics of the head is designed, the magnetic field in the space where the model is located and the temperature on the surface of the coil are measured, the magnetic field measurement results are calculated and analyzed, and the measurement results of the maximum magnetic induction intensity, the spatial magnetic field distribution, the output frequency, the stimulation pulse width and the coil surface temperature are obtained. The method is suitable for detecting and calibrating the core parameters in the research and development and clinical use of the transcranial magnetic stimulation therapeutic instrument, and ensures the safety and effectiveness of the transcranial magnetic stimulation therapeutic instrument.

The present invention provides an inductive component that is easy to manufacture and has precisely adjustable electrical and magnetic properties. The inductive component has a body including a central region of an electrical conductor. The central region is located at the center of the body. Furthermore, the body has one or more recessed grooves that open outward.

The invention discloses a micro-strip circulator based on an MEMS technology. The micro-strip circulator comprises a magnetic conductive bottom plate, a back circuit carrier, a first microcrystalline glass plate, a front circuit carrier, a second microcrystalline glass plate, an insulating spacer and a magnet, the invention further discloses a manufacturing process of the microstrip circulator. Comprising the following steps: performing primary punching on a glass ceramic substrate, performing primary coating, performing secondary coating, manufacturing a pattern of a front circuit carrier, manufacturing the front circuit carrier, removing photoresist and a UV film, manufacturing a pattern of a back circuit carrier, manufacturing the back circuit carrier, performing secondary punching, assembling and connecting and the like, thereby obtaining the microstrip circulator. The dielectric constant of the microcrystal glass plate can be set and regulated according to the type and gyromagnetic characteristics of the gyromagnetic ferrite, so that the microwave guiding effect of the microstrip line is matched with the gyromagnetic effect of the gyromagnetic ferrite, the signal transmission stability of the microstrip circulator is improved, the miniaturized mass production of the microstrip circulator is promoted, the crack rate and the damage rate are low, the cost is reduced, and the application prospect is wide. The production benefit is high.

The application relates to the technical field of motor control, and discloses a stepless rotation speed precision control method of a magnetic stirrer, which comprises the following steps: a power conversion unit outputs a three-phase current signal according to a rotation speed instruction, and a rotating driving magnetic field is established in an electromagnetic energy conversion unit; a high-frequency orthogonal phase perturbation signal is superimposed in the phase angle of a voltage vector, so that the power angle of the rotating driving magnetic field is induced to produce phase offset fluctuation; a stator current response component is extracted, and a synchronous torque limit value is identified, then a control gain is corrected, and a torque feedforward compensation amount is superimposed; the application realizes online perception of the depth of magnetic coupling by analyzing electromagnetic characteristics, utilizes a dynamic compensation mechanism to offset fluid resistance impact in real time, eliminates the risk of slippage of a stirring sub under a high-viscosity reaction working condition, and improves the synchronous robustness and rotation speed control precision of system operation.

The invention discloses a non-contact electric energy transmission device for an aircraft rotating part. The non-contact electric energy transmission device comprises a fixed support, a mounting cylinder, a rotating shaft, a basic cylindrical fixed magnet assembly and a basic cylindrical movable magnet assembly. The mounting cylinder is fixedly connected to the fixing support, the fixing support is fixedly connected with a static part such as a fuselage of the aircraft, and the rotating shaft is connected to a rotating part of the aircraft. In the electric energy transmission process, a power supply transmits high-frequency alternating-current electric energy to the basic primary winding, an alternating magnetic field is generated in the primary winding, and according to the electromagnetic induction principle, the alternating magnetic field passes through the basic primary magnetic core, the basic secondary magnetic core and the basic secondary winding, so that induced electromotive force is generated in the basic secondary winding; and non-contact transmission of electric energy from the basic cylindrical fixed magnet assembly to the basic cylindrical movable magnet assembly is realized. Wires and electric brushes are not arranged in the whole electric energy transmission process, so that various defects caused by poor mechanical friction and electromagnetic property in the prior art are overcome.

This invention relates to a testing device for the magnetic properties of high-permeability materials under low-frequency weak magnetic environments, comprising: a coil assembly, a magnetic property tester, a magnetic shielding cylinder, and a host computer; the coil assembly is wound around the sample under test and connected to the magnetic property tester, and the sample under test with the coil assembly placed inside the magnetic shielding cylinder; the magnetic shielding cylinder provides a weak magnetic environment for the sample under test; the magnetic property tester is used to provide excitation current to the coil assembly and detect the induced voltage of the sample under test, and transmit the measured data to the host computer; the host computer is used to acquire the data measured by the magnetic property tester and plot the magnetization curve. The technical solution of this invention solves the problem that current magnetic property testing devices for magnetic materials cannot obtain the permeability of high-permeability materials under low-frequency weak magnetic environments, thereby improving the accuracy and precision of theoretical and simulation calculations of magnetic shielding devices and reducing the error between design and actual values.

The application discloses a method for preparing electrode materials by magnetic field-induced ion replacement and electrode materials, and belongs to the technical field of functional material preparation. The method comprises the following steps: loading a cobalt-containing metal organic framework material on the surface of a nickel base material through a self-assembly process, and then placing the loaded composite material in a multi-metal mixed salt solution to perform an ion replacement reaction under the driving of an external magnetic field. The method activates the soft magnetic characteristics of the base material by using a magnetic field, can overcome the steric hindrance and high replacement energy barrier caused by the large difference in ion radius, and can thus realize efficient replacement at normal temperature and pressure, form unique active sites and pore structures, and adjust the electronic properties and charge distribution of the material through the strain effect induced by the difference in ion radius, so that the oxygen evolution activity and stability are optimized. The method does not require complex equipment and harsh conditions, is controllable and simple in operation, has the potential for large-scale preparation, and provides a feasible scheme for reducing the cost and increasing the efficiency of an alkaline electrolytic cell.

The invention relates to the technical field of magnetic measurement, and discloses a magnetic measurement method based on an inclined plate, which is applied to a magnetic measurement device and comprises a light source, a polarizer, rotatable plate glass, an objective lens, an analyzer and a detector. The detection light enters the plate glass along a first axis and forms a set angle with the plate glass, and a sample is arranged on a focal plane of the objective lens; the method comprises: turning on a light source to emit detection light; controlling the plate glass to rotate to obtain a target signal; the detection light passes through the polarizer, the flat glass and the objective lens to irradiate the surface of the sample, and the detection light reflected by the surface of the sample passes through the objective lens and the polarization analyzer to reach the detector; in the rotating process of the plate glass, at least two incident positions of the detection light on the objective lens are symmetrical about the optical axis of the objective lens; and obtaining the magnetic characteristics of the sample according to the target signal. The signal-to-noise ratio is improved by controlling the plate glass to rotate. The invention further discloses a magnetic measurement device based on the inclined flat plate, a magnetic measurement device and a computer readable storage medium.

The purpose of this invention is to provide Fe-based amorphous alloys and Fe-based amorphous alloy strips with excellent soft magnetic properties, exhibiting low iron loss and high saturation magnetic flux density. The Fe-based amorphous alloy of this invention, with excellent soft magnetic properties, is characterized by containing, in atomic percent: B: 8.0% or more and 18.0% or less, Si: 2.0% or more and 9.0% or less, C: 0.10% or more and 5.00% or less, Al: 0.005% or more and 1.50% or less, P: 0% or more and less than 1.00%, Mn: 0% or more and 0.30% or less, Fe: 78.00% or more and 86.00% or less, with the remainder being impurities; the microstructure is amorphous.

A rare-earth sintered magnet is provided, characterized in that it comprises R (R is one or more elements selected from rare earth elements, with Nd being essential), T (T is one or more elements selected from iron group elements, with Fe being essential), X (X is one or two elements selected from B and C, with B being essential), and M. 1 (M 1 The rare earth sintered magnet is selected from one or more of Al, Si, Cr, Mn, Cu, Zn, Ga, Ge, Mo, Sn, W, Pb, and Bi, with less than 0.1% O, less than 0.05% N, and less than 0.07% C, and has an average crystal grain size of less than 4.0 μm. Furthermore, when the orientation degree is set to Or [%] and the average crystal grain size is set to D [μm], it satisfies the relationship (1): 0.26×D+97≦Or≦0.26×D+99. Based on this rare earth sintered magnet, it is possible to obtain magnets with both high Br and high H content. cJ It has excellent magnetic properties.