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CN-122000167-A - Gradient magnetizing method of halbach magnetic ring

CN122000167ACN 122000167 ACN122000167 ACN 122000167ACN-122000167-A

Abstract

The invention provides a gradient magnetizing method of a halbach magnetic ring, which comprises a magnetic ring, wherein the cross section of the magnetic ring is sequentially distributed with external downward magnetic poles, left magnetic poles, upward magnetic poles, right magnetic poles and central downward magnetic poles along the radial direction, and the axial asymmetric magnetic force is distributed, and the magnetic ring comprises an upper magnetic area with low magnetic force and a lower magnetic area with high magnetic force. Solves the problems that the traditional technology can not meet the magnetizing requirement and is easy to generate magnetic disorder.

Inventors

  • Tong Haoneng
  • CAI JIE
  • ZHANG HAITAO
  • HUANG KEKE

Assignees

  • 宁波兴隆磁性技术有限公司

Dates

Publication Date
20260508
Application Date
20251225

Claims (9)

  1. 1. A gradient magnetizing method of a halbach magnetic ring is characterized by comprising the following steps: The magnetic ring comprises a magnetic ring (1), wherein the cross section of the magnetic ring (1) is sequentially distributed with external downward magnetic poles, left upward magnetic poles, internal upward magnetic poles, right magnetic poles and central downward magnetic poles along the radial direction, and the magnetic ring is axially asymmetrically distributed with magnetic force, and comprises an upper magnetic area (1.1) with low magnetic force and a lower magnetic area (1.2) with high magnetic force; the magnetizing process comprises the following steps: S1, horizontal magnetic pole magnetizing step, namely applying horizontal magnetizing magnetic fields to left and right magnetic pole areas, and forming gradient magnetization with weak upper and strong lower by regulating and controlling the upper magnetic field strength to be lower than the lower magnetic field strength; s2, axial magnetic pole magnetizing step, namely applying axial magnetizing magnetic fields to the downward and upward magnetic pole areas, and forming gradient magnetization with weak upper and strong lower by regulating and controlling the upper magnetic field intensity to be lower than the lower magnetic field intensity.
  2. 2. The method for magnetizing the halbach ring gradient of claim 1, wherein the step of magnetizing the S1 horizontal poles comprises: s1.1, applying a magnetizing field in a counterclockwise direction below a left magnetic pole area; s1.2, magnetizing magnetic field in the clockwise direction under the right magnetic pole area Fang Shijia.
  3. 3. The method of gradient magnetizing of halbach ring as claimed in claim 2, wherein the step of magnetizing the horizontal poles further comprises: s1.1.1, a left magnetic pole area is provided with a Fang Diejia clockwise auxiliary magnetic field, and the strength of the auxiliary magnetic field is 30% -50% of that of a lower magnetic field; s1.2.1, overlapping an auxiliary magnetic field in the anticlockwise direction above the right magnetic pole area, wherein the strength is 30% -50% of the strength of the lower magnetic field.
  4. 4. A method of gradient magnetizing a halbach ring as claimed in claim 2 or 3, wherein: in step S1, a suppression magnetic field is also applied at the coupling interface of the lower magnetic pole region and the horizontal magnetic pole region, the strength of the suppression magnetic field being 20% to 40% of the main charge magnetic field.
  5. 5. A method of gradient magnetizing a halbach ring as claimed in claim 4, wherein the suppressing magnetic field is applied in a manner comprising: applying a clockwise local bias magnetic field to the lower left quadrant of the outer downward magnetic pole region; A counter-clockwise local bias magnetic field is applied in the lower right quadrant of the inner downward magnetic pole region.
  6. 6. A method of gradient magnetization of a halbach ring as recited in claim 5, wherein said suppressing magnetic field is applied in a manner further comprising: applying a local bias magnetic field in a counterclockwise direction to the upper left quadrant of the outer downward magnetic pole region; A clockwise local bias magnetic field is applied to the upper right quadrant of the inner downward magnetic pole region.
  7. 7. The gradient magnetizing method of halbach magnetic ring as claimed in claim 1, wherein the step of S2, axial pole magnetizing comprises: S2.1, applying a clockwise magnetizing field to the left upper/left lower quadrant of the left lower magnetic pole region, and applying a counterclockwise magnetizing field to the right upper/right lower quadrant; s2.2, applying a counterclockwise magnetizing field to the left upper/left lower quadrant of the upper-right magnetic pole region, and applying a clockwise magnetizing field to the right upper/right lower quadrant; s2.3, applying a clockwise magnetizing field to the left upper/left lower quadrant of the right lower magnetic pole region, and applying a counterclockwise magnetizing field to the right upper/right lower quadrant; Wherein the upper magnetization field strength is 50% to 70% of the lower corresponding field strength.
  8. 8. The method for gradient magnetizing of halbach ring as claimed in claim 7, further comprising the step of S3, horizontal pole enhancement magnetizing: after step S2 is completed, a counter-clockwise strengthening magnetic field is secondarily applied to the lower part of the left-hand magnetic pole region, and a clockwise strengthening magnetic field is secondarily applied to the lower part of the right-hand magnetic pole region.
  9. 9. The gradient magnetizing method of halbach ring as claimed in claim 8, wherein the step of S3, the step of intensified magnetizing comprises: applying a clockwise suppressing magnetic field to the lower left quadrant of the outer downward magnetic pole region; a counter-clockwise suppressing magnetic field is applied to the lower right quadrant of the inner downward magnetic pole region.

Description

Gradient magnetizing method of halbach magnetic ring Technical Field The invention relates to the field of ring-shaped halbach magnet magnetizing, in particular to a gradient magnetizing method of halbach magnetic rings. Background In the modern industrial field, the magnetic ring with a multi-magnetic pole structure is widely applied to the fields of precision instruments, sensors, motor engineering and the like because the magnetic ring can generate complex and specific magnetic field distribution. The performance core of the magnetic ring is the accuracy of magnetic pole distribution, the controllability of magnetic field intensity and the asymmetric characteristic of axial magnetic force, and the magnetizing process directly determines whether the magnetic field parameters of the final product meet the design requirements. The traditional magnetic ring magnetizing process can not meet the magnetizing requirement when facing the requirements of multiple magnetic poles (such as radial orderly distribution of multi-directional magnetic poles) and axial asymmetric magnetic force distribution (such as upper low magnetic force and lower high magnetic force), and is easy to generate magnetic disorder. Disclosure of Invention The invention aims to solve the problems that the traditional technology cannot meet the magnetizing requirement and magnetic disorder is easy to generate. The invention solves the problems by adopting the technical scheme that the gradient magnetizing method of the halbach magnetic ring comprises a magnetic ring, wherein the section of the magnetic ring is sequentially distributed with external downward magnetic poles, left magnetic poles, upward magnetic poles, right magnetic poles and center downward magnetic poles along the radial direction, and the magnetic ring is axially asymmetrically distributed with magnetic force, and comprises an upper magnetic area with low magnetic force and a lower magnetic area with high magnetic force; the magnetizing process comprises the following steps: a horizontal magnetic pole magnetizing step, namely applying a horizontal magnetizing magnetic field to the left-direction magnetic pole region and the right-direction magnetic pole region, and forming gradient magnetization with weak top and strong bottom by regulating and controlling the intensity of an upper magnetic field to be lower than that of a lower magnetic field; and the axial magnetic pole magnetizing step is to apply axial magnetizing magnetic fields to the downward and upward magnetic pole areas, and form gradient magnetization with weak upper and strong lower by regulating and controlling the upper magnetic field strength to be lower than the lower magnetic field strength. According to the gradient magnetizing method of the halbach magnetic ring, horizontal magnetic fields are respectively applied to the left magnetic pole area and the right magnetic pole area in the separate steps, axial magnetic fields are applied to the downward magnetic pole area and the upward magnetic pole area, so that mutual interference of magnetic fields in different directions is avoided, meanwhile, the upper magnetic field strength is regulated and controlled to be lower than the lower magnetic field strength in the two magnetizing steps, an accurate 'weak up and strong down' axial gradient is formed, the complicated magnetic pole distribution and asymmetric magnetic force requirements of the magnetic ring are accurately matched, and the problem of magnetic disorder caused by out-of-control direction, no gradient in strength and disorder of magnetic field superposition in the traditional technology is effectively solved. Further, the horizontal pole magnetizing step comprises the step of applying a magnetizing field in a counterclockwise direction below the left-hand magnetic pole area and applying a magnetizing field in a clockwise direction below the right-hand magnetic pole area Fang Shijia. The horizontal magnetic pole magnetizing step can respectively generate a left horizontal magnetic field in the left magnetic pole area and a right horizontal magnetic field in the right magnetic pole area through a process of applying a magnetizing magnetic field in the anticlockwise direction below the left magnetic pole area and a magnetizing magnetic field in the clockwise direction of Fang Shijia below the right magnetic pole area, thereby generating an effect of accurate horizontal magnetic pole direction and solving the problem that the horizontal magnetic pole direction is easy to deviate. Further, the horizontal magnetic pole magnetizing step further comprises the step of adding an auxiliary magnetic field in the clockwise direction to the left magnetic pole area Fang Diejia, wherein the strength of the auxiliary magnetic field is 30% -50% of that of the lower magnetic field, and adding an auxiliary magnetic field in the anticlockwise direction to the upper side of the right magnetic pole area, and the strength