Gradient magnetizing method of Halbach magnet ring

Abstract

The invention provides a gradient magnetizing method of a Halbach magnet ring, which comprises a magnet ring, the cross section of the magnet ring is sequentially provided with magnetic poles from outside to bottom, from left to top, from top to bottom, from top to bottom, from top to bottom, from top to bottom, from top to bottom, from top to bottom and from top to bottom, and from top to bottom, and the magnet ring is axially and asymmetrically magnetically distributed and comprises a low-magnetic-force upper magnetic area and a high-magnetic-force lower magnetic area; the magnetizing process comprises the following steps: a horizontal magnetic pole magnetizing step: applying a horizontal magnetizing magnetic field to a left magnetic pole area and a right magnetic pole area, and forming gradient magnetization with weak upper part and strong lower part by regulating the magnetic field intensity of the upper part to be lower than the magnetic field intensity of the lower part; and axial magnetic pole magnetizing: applying an axial magnetizing magnetic field to the downward and upward magnetic pole areas, and forming gradient magnetization with weak upper part and strong lower part by regulating the magnetic field intensity of the upper part to be lower than the magnetic field intensity of the lower part. The problems that in the prior art, the magnetizing requirement cannot be met, and magnetic disorder is likely to be generated are solved.

Description

Technical Field

[0001] This invention relates to the field of magnetizing toroidal Helbeck magnets, and more specifically to a gradient magnetization method for a Helbeck magnetic ring. Background Technology

[0002] In modern industry, multi-pole magnetic rings are widely used in precision instruments, sensors, and electrical engineering due to their ability to generate complex and specific magnetic field distributions. The core performance characteristics of these magnetic rings lie in the precision of the pole distribution, the controllability of the magnetic field strength, and the asymmetric nature of the axial magnetic force. The magnetization process directly determines whether the magnetic field parameters of the final product meet the design requirements. Traditional magnetic ring magnetization processes cannot meet the magnetization requirements of multi-pole (e.g., radially distributed multi-directional poles) and axially asymmetric magnetic force distributions (e.g., low magnetic force at the top and high magnetic force at the bottom), easily leading to magnetic disorder. Summary of the Invention

[0003] The problem this invention aims to solve is that traditional techniques cannot meet the magnetization requirements and are prone to magnetic disorder.

[0004] The technical solution adopted by the present invention to solve the above problems is: a gradient magnetization method for a Heilbeck magnetic ring, comprising a magnetic ring, wherein the cross section of the magnetic ring is radially distributed with outer downward, leftward, upward, rightward and center downward magnetic poles, and the axial magnetic force is asymmetrically distributed, including an upper magnetic region with low magnetic force and a lower magnetic region with high magnetic force. The magnetization process includes: Horizontal magnetic pole magnetization steps: Apply a horizontal magnetizing magnetic field to the left and right magnetic pole regions, and form a gradient magnetization by adjusting the upper magnetic field strength to be lower than the lower magnetic field strength; Axial magnetic pole magnetization steps: Apply axial magnetization magnetic fields to the downward and upward magnetic pole regions, and form a gradient magnetization with weaker upper magnetic field strength and stronger lower magnetic field strength by adjusting the upper magnetic field strength to be lower than the lower magnetic field strength.

[0005] The gradient magnetization method of this Heilbeck magnetic ring applies a horizontal magnetic field to the left and right magnetic pole regions in steps, and an axial magnetic field to the downward and upward magnetic pole regions. This avoids mutual interference between magnetic fields in different directions. At the same time, in both magnetization steps, the magnetic field strength in the upper part is controlled to be lower than that in the lower part, forming a precise "weak at the top and strong at the bottom" axial gradient. This precisely matches the complex magnetic pole distribution and asymmetric magnetic force requirements of the magnetic ring, and effectively solves the magnetic disorder problems caused by uncontrolled direction, no gradient in strength, and chaotic magnetic field superposition in traditional technologies.

[0006] Furthermore, the horizontal magnetic pole magnetization step includes: applying a counterclockwise magnetizing magnetic field below the left-facing magnetic pole region; and applying a clockwise magnetizing magnetic field below the right-facing magnetic pole region. This horizontal magnetic pole magnetization step, by applying a counterclockwise magnetizing magnetic field below the left-facing magnetic pole region and a clockwise magnetizing magnetic field below the right-facing magnetic pole region, generates a left-facing horizontal magnetic field in the left-facing magnetic pole region and a right-facing horizontal magnetic field in the right-facing magnetic pole region, respectively, resulting in a precise horizontal magnetic pole orientation and solving the problem of easy deviation in the horizontal magnetic pole orientation.

[0007] Furthermore, the horizontal magnetic pole magnetization step also includes: superimposing a clockwise auxiliary magnetic field above the left-facing magnetic pole region, with an intensity of 30%-50% of the lower magnetic field; and superimposing a counterclockwise auxiliary magnetic field above the right-facing magnetic pole region, with an intensity of 30%-50% of the lower magnetic field. The horizontal magnetic pole magnetization step, through the process of superimposing a clockwise auxiliary magnetic field (30%-50% of the lower magnetic field intensity) above the left-facing magnetic pole region and a counterclockwise auxiliary magnetic field (30%-50% of the lower magnetic field intensity) above the right-facing magnetic pole region, can superimpose a left-facing magnetic field on the upper part of the left-facing magnetic pole region and a right-facing magnetic field on the upper part of the right-facing magnetic pole region, thereby strengthening the top surface magnetic field intensity and making it more uniform. This produces a uniform magnetic field effect on the upper part of the horizontal magnetic pole, solving the problem of insufficient and uneven magnetic field intensity on the upper part of the horizontal magnetic pole.

[0008] Furthermore, a suppressing magnetic field is applied at the coupling interface between the downward magnetic pole region and the horizontal magnetic pole region. The strength of the suppressing magnetic field is 20% to 40% of the main charging magnetic field. By applying a suppressing magnetic field with a strength of 20% to 40% of the main charging magnetic field at the coupling interface between the downward magnetic pole region and the horizontal magnetic pole region, the diffused magnetic field generated by the magnetization of the horizontal magnetic pole at the coupling interface can be counteracted, making the magnetic field strength at this point zero. This results in a stable magnetic field at the coupling interface and solves the problem of magnetic disorder caused by the diffused magnetic field in this region.

[0009] Furthermore, the method of applying the suppressing magnetic field includes: applying a clockwise local bias magnetic field in the lower left quadrant of the outer downward magnetic pole region; and applying a counterclockwise local bias magnetic field in the lower right quadrant of the inner downward magnetic pole region. By applying a clockwise local bias magnetic field in the lower left quadrant of the outer downward magnetic pole region and a counterclockwise local bias magnetic field in the lower right quadrant of the inner downward magnetic pole region, the suppressing magnetic field can respectively cancel the diffused magnetic field generated by the counterclockwise magnetic field below the left-facing magnetic pole region in the outer downward magnetic pole region and the diffused magnetic field generated by the clockwise magnetic field below the right-facing magnetic pole region in the inner downward magnetic pole region, making the magnetic field strength in these two locations zero. This produces a stable magnetic field in specific quadrants, solving the problem of magnetic disturbance caused by the diffused magnetic field in these quadrants.

[0010] Furthermore, the method of applying the suppressing magnetic field also includes: applying a counterclockwise local bias magnetic field in the upper left quadrant of the outer downward magnetic pole region; and applying a clockwise local bias magnetic field in the upper right quadrant of the inner downward magnetic pole region. The suppressing magnetic field, by applying a counterclockwise local bias magnetic field in the upper left quadrant of the outer downward magnetic pole region and a clockwise local bias magnetic field in the upper right quadrant of the inner downward magnetic pole region, can respectively cancel the diffused magnetic field generated by the clockwise auxiliary magnetic field above the left-facing magnetic pole region in the outer downward magnetic pole region and the diffused magnetic field generated by the counterclockwise auxiliary magnetic field above the right-facing magnetic pole region in the inner downward magnetic pole region, making the magnetic field strength in these two locations zero. This results in the stability of the magnetic field in more quadrants, solving the problem of magnetic disturbance caused by the diffused magnetic field in these newly added quadrants.

[0011] Furthermore, the axial magnetic pole magnetization step includes: applying a clockwise magnetizing field to the upper left / lower left quadrant of the left downward magnetic pole region and a counterclockwise magnetizing field to the upper right / lower right quadrant; applying a counterclockwise magnetizing field to the upper left / lower left quadrant of the upward magnetic pole region and a clockwise magnetizing field to the upper right / lower right quadrant; applying a clockwise magnetizing field to the upper left / lower left quadrant of the right downward magnetic pole region and a counterclockwise magnetizing field to the upper right / lower right quadrant; wherein the intensity of the upper magnetizing field is 50% to 70% of the intensity of the corresponding lower magnetic field.

[0012] The axial magnetic pole magnetization step involves applying a clockwise magnetizing field to the upper left / lower left quadrant and a counterclockwise magnetizing field to the upper right / lower right quadrant of the left downward magnetic pole region; applying a counterclockwise magnetizing field to the upper left / lower left quadrant and a clockwise magnetizing field to the upper right / lower right quadrant of the upward magnetic pole region; and applying a clockwise magnetizing field to the upper left / lower left quadrant and a counterclockwise magnetizing field to the upper right / lower right quadrant of the right downward magnetic pole region. The upper magnetizing field strength is 50% to 70% of the corresponding lower magnetic field strength. This process generates a downward axial magnetic field in the left and right downward magnetic pole regions and an upward axial magnetic field in the upward magnetic pole region, creating a gradient that is weaker at the top and stronger at the bottom. This results in a precise axial magnetic pole orientation and a gradient that meets the requirements, solving the problems of chaotic axial magnetic pole orientation and gradient misalignment.

[0013] Furthermore, the process includes a horizontal magnetic pole strengthening magnetization step: after completing the axial magnetic pole magnetization, a counterclockwise strengthening magnetic field is applied twice to the area below the left-hand magnetic pole region, and a clockwise strengthening magnetic field is applied twice to the area below the right-hand magnetic pole region. This horizontal magnetic pole strengthening magnetization step, which involves applying a counterclockwise strengthening magnetic field twice to the area below the left-hand magnetic pole region and a clockwise strengthening magnetic field twice to the area below the right-hand magnetic pole region after completing the axial magnetic pole magnetization, strengthens the leftward-facing horizontal magnetic field of the left-hand magnetic pole region and the rightward-facing horizontal magnetic field of the right-hand magnetic pole region, resulting in stronger horizontal magnetic pole magnetism and solving the problem of weakened horizontal magnetic pole magnetism after axial magnetization.

[0014] Furthermore, the enhanced magnetization step also includes: applying a clockwise suppressive magnetic field to the lower left quadrant of the outer downward magnetic pole region; and applying a counterclockwise suppressive magnetic field to the lower right quadrant of the inner downward magnetic pole region. This enhanced magnetization step, by simultaneously applying a clockwise suppressive magnetic field to the lower left quadrant of the outer downward magnetic pole region and a counterclockwise suppressive magnetic field to the lower right quadrant of the inner downward magnetic pole region, can counteract the influence of the diffused magnetic field generated by the horizontal magnetic pole on the downward magnetic pole region during enhanced magnetization, resulting in a stable magnetic field during the enhancement process. This solves the problem of magnetic disturbance caused by interference in the downward magnetic pole region during enhanced magnetization.

[0015] Furthermore, the ratio of the magnetic field strength between the horizontal pole magnetization step and the axial pole magnetization step is 1:1.5 to 1:2.5, and the coercivity difference in the gradient magnetization region is 15% to 30%. By setting the ratio of the magnetic field strength between the horizontal pole magnetization step and the axial pole magnetization step to 1:1.5 to 1:2.5, and making the coercivity difference in the gradient magnetization region 15% to 30%, this process can achieve a reasonable match between the magnetic properties of the horizontal and axial poles and a stable gradient, resulting in a harmonious overall magnetic ring with a stable gradient. This solves the problem of magnetic mismatch between the horizontal and axial poles and gradient instability leading to overall magnetic disorder. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the horizontal magnetic pole magnetization steps in the first embodiment of the present invention; Figure 2 This is a schematic diagram of the axial magnetic pole magnetization steps in the first embodiment of the present invention; Figure 3 This is a schematic diagram of the horizontal magnetic pole magnetization steps in the second embodiment of the present invention; Figure 4 This is a schematic diagram of the axial magnetic pole magnetization steps in the second embodiment of the present invention; Figure 5 This is a schematic diagram of the horizontal magnetic pole magnetization steps in the third embodiment of the present invention; Figure 6This is a schematic diagram of the axial magnetic pole magnetization steps according to the third embodiment of the present invention; Figure 7 This is a schematic diagram of the horizontal magnetic pole strengthening magnetization steps in the third embodiment of the present invention.

[0017] Diagram: 1. Magnetic ring; 1.1. Upper magnetic region; 1.2. Lower magnetic region. Detailed Implementation

[0018] Before detailing any embodiment of the invention, it should be understood that the invention, in its application, is not limited to the details of the construction and arrangement of the components set forth in the following description or illustrated in the following figures. The invention can have other embodiments and can be practiced or carried out in various ways. Furthermore, it should be understood that the wording and terminology used herein are for descriptive purposes and should not be considered limiting. The use of “comprising” or “having” and variations thereof is intended to cover the items set forth below and their equivalents, as well as any additional items. Unless otherwise specified or limited, the terms “installation,” “connection,” “support,” and “linkage,” and variations thereof are used broadly and cover both direct and indirect installation, connection, support, and linking. Moreover, “connection” and “linkage” are not limited to physical or mechanical connections or links.

[0019] Furthermore, firstly, in the disclosure of this invention, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the mechanism or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limiting this invention. Secondly, the term "a" should be understood as "at least one" or "one or more," that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple. The term "a" should not be construed as a limitation on the quantity.

[0020] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are merely examples and do not limit the present invention. The objectives of the present invention have been fully and effectively achieved. The functions and structural principles of the present invention have been demonstrated and explained in the embodiments, and any variations or modifications may be made to the implementation of the present invention without departing from the stated principles.

[0021] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0022] A magnetic ring 1 is provided, wherein the cross section of the magnetic ring 1 is radially distributed with outer downward, leftward, inner upward, rightward and center downward magnetic poles, and the magnetic force is axially asymmetrically distributed, including an upper magnetic region 1.1 with low magnetic force and a lower magnetic region 1.2 with high magnetic force. First Embodiment Please refer to Figure 1 and Figure 2 The magnetization process includes: Magnetizing steps for horizontal magnetic poles: A counterclockwise magnetizing magnetic field is applied below the left-hand magnetic pole region to generate a horizontal magnetic field pointing to the left in the left-hand magnetic pole region; A clockwise magnetizing magnetic field is applied below the right-hand magnetic pole region to generate a horizontal magnetic field pointing to the right in the right-hand magnetic pole region.

[0023] Simultaneously, a suppressing magnetic field is applied at the coupling interface between the downward magnetic pole region and the horizontal magnetic pole region, the strength of which is 20% to 40% of the main charging magnetic field.

[0024] Specifically: A clockwise local bias magnetic field is applied to the lower left quadrant of the outer downward magnetic pole region to counteract the diffused magnetic field generated by the magnetizing magnetic field applied from the left to the lower part of the magnetic pole region in the outer downward magnetic pole region, so that the magnetic field strength here is 0. A counterclockwise local bias magnetic field is applied to the lower right quadrant of the inner downward magnetic pole region to counteract the diffused magnetic field generated by the clockwise magnetizing magnetic field applied below the right-side magnetic pole region in the inner downward magnetic pole region, so that the magnetic field strength here is 0.

[0025] Because a counterclockwise magnetizing magnetic field is applied below the left-hand magnetic pole region, and a clockwise magnetizing magnetic field is applied below the right-hand magnetic pole region, the two magnetic fields converge in the upward magnetic pole region. Since the magnetic field strengths of the two fields are the same, the magnetic field strength in the upward magnetic pole region is 0.

[0026] Meanwhile, since no magnetic field is set in the upper part, the magnetic field strength of the upper magnetic region 1.1 with low magnetic field strength is less than that of the lower magnetic region 1.2 with high magnetic field strength.

[0027] Axial pole magnetization steps: A clockwise magnetizing field is applied to the upper left / lower left quadrant of the left-side downward magnetic pole region to generate a downward axial magnetic field on the left side of the left-side downward magnetic pole region, and a counterclockwise magnetizing field is applied to the upper right / lower right quadrant to generate a downward axial magnetic field on the right side of the left-side downward magnetic pole region. A counterclockwise magnetizing field is applied to the upper left / lower left quadrant of the upward magnetic pole region to generate an upward axial magnetic field on the left side of the upward magnetic pole region, and a clockwise magnetizing field is applied to the upper right / lower right quadrant to generate an upward axial magnetic field on the right side of the upward magnetic pole region. A clockwise magnetizing field is applied to the upper left / lower left quadrant of the right downward magnetic pole region to generate a downward axial magnetic field on the left side of the right downward magnetic pole region, and a counterclockwise magnetizing field is applied to the upper right / lower right quadrant to generate a downward axial magnetic field on the right side of the right downward magnetic pole region. The magnetization field strength above is 50% to 70% of the corresponding magnetic field strength below.

[0028] Please refer to Figure 3 and Figure 4 Second embodiment Magnetizing steps for horizontal magnetic poles: A counterclockwise magnetizing magnetic field is applied below the left-hand magnetic pole region to generate a horizontal magnetic field pointing to the left in the left-hand magnetic pole region; A clockwise magnetizing magnetic field is applied below the right-hand magnetic pole region to generate a horizontal magnetic field pointing to the right in the right-hand magnetic pole region.

[0029] Simultaneously, a suppressing magnetic field is applied at the coupling interface between the downward magnetic pole region and the horizontal magnetic pole region, the strength of which is 20% to 40% of the main charging magnetic field.

[0030] Specifically: A clockwise local bias magnetic field is applied to the lower left quadrant of the outer downward magnetic pole region to counteract the diffused magnetic field generated by the magnetizing magnetic field applied from the left to the lower part of the magnetic pole region in the outer downward magnetic pole region, so that the magnetic field strength here is 0. A counterclockwise local bias magnetic field is applied to the lower right quadrant of the inner downward magnetic pole region to counteract the diffused magnetic field generated by the clockwise magnetizing magnetic field applied below the right-side magnetic pole region in the inner downward magnetic pole region, so that the magnetic field strength here is 0.

[0031] Because a counterclockwise magnetizing magnetic field is applied below the left-hand magnetic pole region, and a clockwise magnetizing magnetic field is applied below the right-hand magnetic pole region, the two magnetic fields converge in the upward magnetic pole region. Since the magnetic field strengths of the two fields are the same, the magnetic field strength in the upward magnetic pole region is 0.

[0032] The horizontal pole magnetization process also includes: An auxiliary magnetic field in a clockwise direction is superimposed above the left-facing magnetic pole region, with an intensity of 30%-50% of the magnetic field below, so as to superimpose a left-facing magnetic field on the upper part of the left-facing magnetic pole region, strengthen the magnetic field intensity on the top surface, and make the magnetic field intensity on the upper part more uniform. An auxiliary magnetic field in a counterclockwise direction is superimposed above the right-facing magnetic pole region, with an intensity of 30%-50% of the magnetic field below, so as to superimpose a right-facing magnetic field on the upper part of the right-facing magnetic pole region, strengthen the magnetic field intensity on the top surface, and make the magnetic field intensity in the upper part more uniform.

[0033] Other methods for suppressing the application of magnetic fields include: A counterclockwise local bias magnetic field is applied to the upper left quadrant of the outer downward magnetic pole region to counteract the diffused magnetic field generated by the clockwise magnetizing magnetic field applied from the left to the top of the magnetic pole region in the outer downward magnetic pole region, so that the magnetic field strength here is 0. A clockwise local bias magnetic field is applied to the upper right quadrant of the inner downward magnetic pole region to counteract the diffused magnetic field generated by the counterclockwise magnetizing magnetic field applied above the right-facing magnetic pole region in the inner downward magnetic pole region, so that the magnetic field strength here is 0.

[0034] Axial pole magnetization steps: A clockwise magnetizing field is applied to the upper left / lower left quadrant of the left-side downward magnetic pole region to generate a downward axial magnetic field on the left side of the left-side downward magnetic pole region, and a counterclockwise magnetizing field is applied to the upper right / lower right quadrant to generate a downward axial magnetic field on the right side of the left-side downward magnetic pole region. A counterclockwise magnetizing field is applied to the upper left / lower left quadrant of the upward magnetic pole region to generate an upward axial magnetic field on the left side of the upward magnetic pole region, and a clockwise magnetizing field is applied to the upper right / lower right quadrant to generate an upward axial magnetic field on the right side of the upward magnetic pole region. A clockwise magnetizing field is applied to the upper left / lower left quadrant of the right downward magnetic pole region to generate a downward axial magnetic field on the left side of the right downward magnetic pole region, and a counterclockwise magnetizing field is applied to the upper right / lower right quadrant to generate a downward axial magnetic field on the right side of the right downward magnetic pole region. The magnetization field strength above is 50% to 70% of the corresponding magnetic field strength below.

[0035] Please refer to Figures 5 to 7 Third embodiment Magnetizing steps for horizontal magnetic poles: A counterclockwise magnetizing magnetic field is applied below the left-hand magnetic pole region to generate a horizontal magnetic field pointing to the left in the left-hand magnetic pole region; A clockwise magnetizing magnetic field is applied below the right-hand magnetic pole region to generate a horizontal magnetic field pointing to the right in the right-hand magnetic pole region.

[0036] Simultaneously, a suppressing magnetic field is applied at the coupling interface between the downward magnetic pole region and the horizontal magnetic pole region, the strength of which is 20% to 40% of the main charging magnetic field.

[0037] Specifically: A clockwise local bias magnetic field is applied to the lower left quadrant of the outer downward magnetic pole region to counteract the diffused magnetic field generated by the magnetizing magnetic field applied from the left to the lower part of the magnetic pole region in the outer downward magnetic pole region, so that the magnetic field strength here is 0. A counterclockwise local bias magnetic field is applied to the lower right quadrant of the inner downward magnetic pole region to counteract the diffused magnetic field generated by the clockwise magnetizing magnetic field applied below the right-side magnetic pole region in the inner downward magnetic pole region, so that the magnetic field strength here is 0.

[0038] Because a counterclockwise magnetizing magnetic field is applied below the left-hand magnetic pole region, and a clockwise magnetizing magnetic field is applied below the right-hand magnetic pole region, the two magnetic fields converge in the upward magnetic pole region. Since the magnetic field strengths of the two fields are the same, the magnetic field strength in the upward magnetic pole region is 0.

[0039] The horizontal pole magnetization process also includes: An auxiliary magnetic field in a clockwise direction is superimposed above the left-facing magnetic pole region, with an intensity of 30%-50% of the magnetic field below, so as to superimpose a left-facing magnetic field on the upper part of the left-facing magnetic pole region, strengthen the magnetic field intensity on the top surface, and make the magnetic field intensity on the upper part more uniform. An auxiliary magnetic field in a counterclockwise direction is superimposed above the right-facing magnetic pole region, with an intensity of 30%-50% of the magnetic field below, so as to superimpose a right-facing magnetic field on the upper part of the right-facing magnetic pole region, strengthen the magnetic field intensity on the top surface, and make the magnetic field intensity in the upper part more uniform.

[0040] Other methods for suppressing the application of magnetic fields include: A counterclockwise local bias magnetic field is applied to the upper left quadrant of the outer downward magnetic pole region to counteract the diffused magnetic field generated by the clockwise magnetizing magnetic field applied above the left-to-right magnetic pole region in the outer downward magnetic pole region, so that the magnetic field strength here is 0; a clockwise local bias magnetic field is applied to the upper right quadrant of the inner downward magnetic pole region to counteract the diffused magnetic field generated by the counterclockwise magnetizing magnetic field applied above the right-to-right magnetic pole region in the inner downward magnetic pole region, so that the magnetic field strength here is 0.

[0041] Axial pole magnetization steps: A clockwise magnetizing field is applied to the upper left / lower left quadrant of the left-side downward magnetic pole region to generate a downward axial magnetic field on the left side of the left-side downward magnetic pole region, and a counterclockwise magnetizing field is applied to the upper right / lower right quadrant to generate a downward axial magnetic field on the right side of the left-side downward magnetic pole region. A counterclockwise magnetizing field is applied to the upper left / lower left quadrant of the upward magnetic pole region to generate an upward axial magnetic field on the left side of the upward magnetic pole region, and a clockwise magnetizing field is applied to the upper right / lower right quadrant to generate an upward axial magnetic field on the right side of the upward magnetic pole region. A clockwise magnetizing field is applied to the upper left / lower left quadrant of the right downward magnetic pole region to generate a downward axial magnetic field on the left side of the right downward magnetic pole region, and a counterclockwise magnetizing field is applied to the upper right / lower right quadrant to generate a downward axial magnetic field on the right side of the right downward magnetic pole region. The magnetization field strength above is 50% to 70% of the corresponding magnetic field strength below.

[0042] After completing the axial magnetic pole magnetization step, a horizontal magnetic pole strengthening magnetization step is performed: After the axial magnetic poles are magnetized A counterclockwise reinforcing magnetic field is applied twice below the left-facing magnetic pole region to strengthen the horizontal magnetic field generated to the left in the left-facing magnetic pole region; a clockwise reinforcing magnetic field is applied twice below the right-facing magnetic pole region to strengthen the horizontal magnetic field generated to the right in the right-facing magnetic pole region.

[0043] A clockwise suppressive magnetic field is applied to the lower left quadrant of the outer downward magnetic pole region; A counterclockwise suppressing magnetic field is applied in the lower right quadrant of the inner downward magnetic pole region. The above description is only of the preferred embodiment of the invention and should not be construed as limiting the scope of the claims. The invention is not limited to the above embodiments, and variations in its specific structure are permitted. All variations made within the scope of the independent claims of this invention are also within the scope of protection of this invention.

Claims

1. A gradient magnetization method for a Heilbeck magnetic ring, characterized in that: It includes a magnetic ring (1), the cross section of which has magnetic poles distributed radially in the direction of outward downward, leftward, inward upward, rightward and center downward, and the magnetic force is distributed axially asymmetrically, including an upper magnetic region (1.1) with low magnetic force and a lower magnetic region (1.2) with high magnetic force; The magnetization process includes: S1. Horizontal magnetic pole magnetization steps: Apply a horizontal magnetizing magnetic field to the left and right magnetic pole regions, and form a gradient magnetization by adjusting the upper magnetic field strength to be lower than the lower magnetic field strength. S2, Axial magnetic pole magnetization step: Apply axial magnetization magnetic field to the downward and upward magnetic pole regions, and form a gradient magnetization with weaker upper magnetic field and stronger lower magnetic field by adjusting the upper magnetic field strength to be lower than the lower magnetic field strength.

2. The gradient magnetization method for the Heilbeck magnetic ring according to claim 1, characterized in that... S1. The steps for magnetizing the horizontal magnetic poles include: S1.1 Apply a counterclockwise magnetizing magnetic field below the left-hand magnetic pole region; S1.2 Apply a clockwise magnetizing magnetic field below the right-hand magnetic pole region.

3. The gradient magnetization method for the Heilbeck magnetic ring according to claim 2, characterized in that... The horizontal magnetic pole magnetization step further includes: S1.1.

1. A clockwise auxiliary magnetic field is superimposed above the left-hand magnetic pole region, with an intensity of 30%-50% of the magnetic field below; S1.2.

1. A counterclockwise auxiliary magnetic field is superimposed above the right-hand magnetic pole region, with an intensity of 30%-50% of the magnetic field below.

4. The gradient magnetization method for a Heilbeck magnetic ring according to claim 2 or 3, characterized in that: In step S1, a suppressing magnetic field is also applied simultaneously. The suppressing magnetic field is applied at the coupling interface between the downward magnetic pole region and the horizontal magnetic pole region. The strength of the suppressing magnetic field is 20% to 40% of the main charging magnetic field.

5. The gradient magnetization method for the Heilbeck magnetic ring according to claim 4, characterized in that... The methods for applying the suppressing magnetic field include: A local bias magnetic field in a clockwise direction is applied to the lower left quadrant of the outer downward magnetic pole region; A localized bias magnetic field in the counterclockwise direction is applied to the lower right quadrant of the inner downward magnetic pole region.

6. The gradient magnetization method for the Heilbeck magnetic ring according to claim 5, characterized in that... The method of applying the suppressing magnetic field also includes: A localized bias magnetic field in a counterclockwise direction is applied 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. The gradient magnetization method for the Heilbeck magnetic ring according to claim 1, characterized in that... The S2 step, axial pole magnetization step, includes: S2.1 Apply a clockwise magnetizing field to the upper left / lower left quadrant of the left downward magnetic pole region, and a counterclockwise magnetizing field to the upper right / lower right quadrant; S2.2 Apply a counterclockwise magnetizing field to the upper left / lower left quadrant of the upward magnetic pole region, and a clockwise magnetizing field to the upper right / lower right quadrant; S2.3 Apply a clockwise magnetizing field to the upper left / lower left quadrant of the right downward magnetic pole region, and a counterclockwise magnetizing field to the upper right / lower right quadrant; The magnetization field strength above is 50% to 70% of the corresponding magnetic field strength below.

8. The gradient magnetization method for the Heilbeck magnetic ring according to claim 7, characterized in that... It also includes S3, the horizontal magnetic pole strengthening magnetization step: After completing step S2, a counterclockwise reinforcing magnetic field is applied twice to the area below the left-hand magnetic pole region, and a clockwise reinforcing magnetic field is applied twice to the area below the right-hand magnetic pole region.

9. The gradient magnetization method for the Heilbeck magnetic ring according to claim 8, characterized in that... S3, the enhanced magnetization step also includes: A clockwise suppressive magnetic field is applied to the lower left quadrant of the outer downward magnetic pole region; A counterclockwise suppressive magnetic field is applied to the lower right quadrant of the inner downward magnetic pole region.

Images