CN-119811880-B - Method for adjusting magnetic field intensity uniformity of magnetic poles of radiation orientation magnetic ring

CN119811880BCN 119811880 BCN119811880 BCN 119811880BCN-119811880-B

Abstract

The invention relates to a method for adjusting the magnetic field intensity uniformity of a magnetic pole of a radiation orientation magnetic ring, belongs to the technical field of magnetic field uniformity control, and solves the problems that in the prior art, the difference value of the magnetic pole uniformity of the magnetic ring is large, the magnetic field intensity uniformity of the magnetic pole of the magnetic ring is not high, and the uniformity of the magnetic field intensity distribution of the magnetic pole of the magnetic ring is difficult to accurately control and adjust. A method for adjusting the uniformity of magnetic field intensity of magnetic poles of a radiation orientation magnetic ring sequentially carries out the local adjustment of the magnetic field intensity on the magnetic poles of the magnetic ring in sequence under the open-circuit environment. Realizes the regulation and control preparation of the high-uniformity radiation orientation magnetic ring.

Inventors

CHEN HONGSHENG
HAN RUI
LI DONGLI
ZHOU MINGGE
ZHANG JIATENG
DONG SHENGZHI
LI WEI

Assignees

钢铁研究总院有限公司

Dates

Publication Date: 20260508
Application Date: 20241206

Claims (5)

1. A method for adjusting the uniformity of the magnetic field intensity of a magnetic pole of a radiation orientation magnetic ring is characterized in that magnetic field intensity is locally adjusted to the magnetic poles of the magnetic ring sequentially in an open-circuit environment, wherein an adjusting magnetic field is applied to the magnetic poles at the local position of a single magnetic pole, and meanwhile, the surface area of the magnetic pole is heated to a certain temperature, and the radius range of the magnetic ring is 5-30 mm; the adjusting order is that the magnetic field intensity of each magnetic pole is sequentially adjusted according to the difference value between the magnetic field intensity of the magnetic pole and the target value from big to small; the local position of the single magnetic pole is the peak area of each magnetic pole, and the included polar angle width is not more than 20 degrees; The size of the magnetic field applied in the adjusting process is not more than 5000Gs, and the distance from the surface of the magnetic ring is not more than 0.5mm; The temperature range of the temperature applied in the adjustment process is 150-400 ℃, the temperature acting area is not more than 1mm 2 , and the single time is not more than 3s; the local adjustment times of the magnetic field intensity of each magnetic pole are more than 1, and the size range of the magnetic pole difference value is adjusted for 1-70 Gs once.
2. The method according to claim 1, wherein the magnetic ring is subjected to monopole radiation orientation magnetization or multipole radiation orientation magnetization before the magnetic ring magnetic pole magnetic field strength is subjected to uniformity adjustment treatment, the magnetic ring is placed in a corresponding orientation magnetic field to be subjected to saturation magnetization, the magnetic field strength of the magnetic ring magnetic pole after magnetization is 1000-5000 gs, and the deviation range of the magnetic pole strength is 2-15%.
3. The adjusting method according to claim 1, wherein the magnetic ring magnetic pole magnetic field strength local area adjusting method is applicable to magnetic ring size characteristics and comprises the steps that the axial height of a magnetic ring is not smaller than 1mm, and the ratio of inner diameter to outer diameter is 0.55-0.95.
4. The method for adjusting magnetic field intensity of magnetic ring according to claim 3, wherein the magnetic ring is made of permanent magnetic material, coercive force is not less than 10kOe, and magnetic energy product is not less than 10MGOe.
5. The method of claim 1, wherein the uniformity of the magnetic field strength distribution of the magnetic ring is adjusted to <2%.

Description

Method for adjusting magnetic field intensity uniformity of magnetic poles of radiation orientation magnetic ring Technical Field The invention relates to the technical field of magnetic field uniformity control, in particular to a method for adjusting the magnetic field intensity uniformity of a magnetic pole of a radiation orientation magnetic ring. Background Magnetic materials are an important class of functional materials and have been widely used in advanced manufacturing fields such as precision machine tools, aerospace equipment, industrial robots, power equipment and the like. The radiation orientation magnetic ring is a magnetic material with a special orientation structure, crystal grains of the radiation orientation magnetic ring are easy to magnetize and radially arranged along the radial direction, the whole structure is compact, the assembly compactness is high, the stray magnetic field is small, the stability of the output magnetic field is high, and the radiation orientation magnetic ring is particularly suitable for the aspects of high-end permanent magnet motors, high-precision magnetic sensors and the like. The traditional method for manufacturing the radiation orientation magnetic ring comprises the steps of splicing, sintering the magnetic ring, bonding the magnetic ring and hot-pressing/hot-deforming the whole magnetic ring, wherein the magnetic rings prepared by different methods have different performances, and the magnetic rings with corresponding magnetic field distribution and strength such as internal and external monopole radiation magnetization, multipolar radiation magnetization and the like can be realized according to the requirements of service environments. In order to ensure stable and reliable operation of magnetic equipment, the consistency of the magnetic field intensity distribution of magnetic poles of a magnetic ring is generally required to be high, the organization structure and magnetization state of the magnetic ring are difficult to be completely consistent due to the limitation of manufacturing process and the like, so that the magnetic field intensity distribution of the magnetic poles of the magnetic ring has difference, the difference of the magnetic pole-to-pole non-uniformity of the existing magnetic ring is generally more than 4%, and further, the consistency of the magnetic field intensity distribution of the magnetic ring is very difficult to improve through the uniformity improvement of the magnetic ring. Aiming at the application requirements of the magnetic ring with higher uniformity, the magnetic ring can be optimized by adding shimming sheets and the like, or the magnetic ring magnetization area is partially demagnetized by an external magnetic field, the processing modes need complex designs, the operation space is limited, and meanwhile, the magnetic field change size is difficult to realize more accurately, and the magnetic ring is not suitable for multipolar magnetic rings with small size and more magnetic poles. Disclosure of Invention In view of the above analysis, the embodiment of the invention aims to provide a method for adjusting the magnetic field intensity uniformity of a magnetic pole of a radiation orientation magnetic ring, which is used for solving at least one of the problems that the difference of the magnetic pole uniformity of the magnetic pole of the existing magnetic ring is large, the magnetic field intensity uniformity of the magnetic pole of the magnetic ring is not high, the consistency of the magnetic field intensity distribution of the magnetic pole of the magnetic ring is difficult to accurately control and adjust, and the like. A method for adjusting the uniformity of magnetic field intensity of magnetic poles of a radiation orientation magnetic ring sequentially carries out the local adjustment of the magnetic field intensity on the magnetic poles of the magnetic ring in sequence under the open-circuit environment. Further, the adjusting order is to sequentially adjust the magnetic field intensity of each magnetic pole according to the difference value between the magnetic field intensity of each magnetic pole and the target value from large to small. Preferably, the local position of the single magnetic pole is the peak area of each magnetic pole, and the included polar angle width is not more than 20 °. The size of the adjusting magnetic field applied in the adjusting process is not more than 5000Gs, and the distance from the surface of the magnetic ring is not more than 0.5mm. Further, the temperature range of the temperature regulation applied in the regulation process is 150-400 ℃, the temperature action area is not more than 1mm 2, and the single time is not more than 3s. It is noted that the local adjustment times of the magnetic field intensity of each magnetic pole is more than 1, and the magnitude of the magnetic pole difference value is adjusted within the range of 1-70 Gs once. Specifically, before uni