Magnetizing arrangement of Halbach magnet ring

Abstract

The utility model provides a magnetizing arrangement of a Halbach magnet ring. The magnetizing arrangement comprises magnetizing magnetic rings and magnetic rings to be magnetized, and one magnetic ring is arranged outside the other magnetic ring in a sleeving mode. According to the magnetizing magnet ring, the magnetizing magnet ring comprises a first magnet section and a second magnet section, the two magnet sections are alternately arranged in the circumferential direction to form the magnet ring, and the first magnet section and the second magnet section have different magnetizing directions. By means of the magnetizing arrangement, the magnetizing period can be shortened, and the manufacturing cost of the Halbach magnet ring is reduced. In addition, the orientation of the whole Halbach magnet ring obtained by the magnetizing arrangement provided by the utility model basically accords with an ideal Halbach magnet array.

Description

Technical Field

[0001] This invention relates to magnets, particularly Hellbeck magnetic rings. Specifically, it relates to a magnetization arrangement for Hellbeck magnetic rings. Background Technology

[0002] Halbach magnet arrays are particularly suitable for use in motor rotors because they can generate strong unilateral magnetic fields. These arrays are constructed by arranging magnets with magnetization directions opposite to each other in a specific pattern, causing magnetic field lines to converge on one side of the array. This significantly strengthens the magnetic field on that side, while the magnetic field lines weaken or even approach zero on the other side.

[0003] Traditional Helbeck magnet arrays are in the form of a single sintered magnetic ring. Magnetization is performed using a sinusoidal magnetization method, such as with the aid of a pulse magnetization device. Under current magnetization methods, the resulting magnet arrays have the following drawbacks: high manufacturing cost, low remanence (Br), and failure to achieve the performance expected of ideal Helbeck magnet arrays.

[0004] An improved Helbeck magnet array has been proposed, which is constructed as a segmented magnet array, comprising a first magnet segment and a second magnet segment, the two types of magnet segments being arranged alternately circumferentially to form a magnetic ring, the first magnet segment and the second magnet segment having different magnetization directions. Examples of such magnet arrays are disclosed, for example, in the following documents: US 2012119861A1, US2020064424A1 and Chinese invention patent application CN116580917A. This magnet array can be obtained by first forming a magnetic ring in a mold by, for example, plastic molding or bonding, and then magnetizing it in the manner described above.

[0005] There is still a need to improve the Hellbeck magnet array. Utility Model Content

[0006] The purpose of this invention is to provide an improved Hellbeck magnet array to maximize the performance of the magnet rings to be magnetized, achieving the desired performance of the Hellbeck magnet array. Another objective is to reduce the magnetization cost of Hellbeck magnet rings.

[0007] Therefore, this invention proposes a magnetization arrangement for Helbeck magnetic rings, comprising a magnetizing magnetic ring and a magnetic ring to be magnetized, wherein one magnetic ring is sleeved over another. According to this invention, the magnetizing magnetic ring includes a first magnet segment and a second magnet segment, which are arranged alternately circumferentially to form the magnetic ring. The first and second magnet segments have different magnetization directions. This arrangement eliminates the need for a pulse magnetization device and allows simultaneous magnetization of the magnetic ring to be magnetized at temperatures exceeding 150 degrees Celsius during the formation of the magnetic ring by injection molding or bonding, thereby reducing the magnetization cycle.

[0008] According to the embodiment, the magnetization direction of the first magnet segment is radial, and the magnetization direction of the second magnet segment is tangential or circumferential.

[0009] According to an embodiment, the magnetization directions of adjacent first magnet segments in the circumferential direction are opposite to each other, and the magnetization directions of adjacent second magnet segments in the circumferential direction are opposite to each other.

[0010] According to the embodiment, the first magnet segment is constructed as a trapezoidal cross-section segment, and the second magnet segment is constructed as a rectangular cross-section segment.

[0011] According to an embodiment, the magnetizing ring is located outside the ring to be magnetized. This arrangement is suitable for an internal rotor configuration.

[0012] According to another embodiment, the magnetic ring to be magnetized is located outside the magnetizing magnetic ring. This arrangement is suitable for an outer rotor configuration. Furthermore, in this arrangement, the orientation (magnetization direction) of each magnet segment of the magnetizing magnetic ring is opposite to the orientation of each magnet segment in an arrangement where the magnetizing magnetic ring is located outside the magnetic ring to be magnetized.

[0013] According to an embodiment, the ratio of the outer radius of the magnetized magnetic ring to the outer radius of the magnetic ring to be magnetized is >1.5.

[0014] According to an embodiment, the ratio of the inner and outer radii of the magnetic ring to be magnetized is <0.92.

[0015] According to an embodiment, the ratio of the arc angle of the first magnet segment on the inner ring of the magnetized magnetic ring to the arc angle on the outer ring is 1.2-1.8. Correspondingly, the arc angle of the second magnet segment on the inner ring of the magnetized magnetic ring is equal to 360 degrees divided by the number of magnetic poles minus the arc angle of the first magnet segment on the inner ring of the magnetized magnetic ring, and the arc angle of the second magnet segment on the outer ring of the magnetized magnetic ring is also equal to 360 degrees divided by the number of magnetic poles minus the arc angle of the first magnet segment on the outer ring of the magnetized magnetic ring.

[0016] According to an embodiment, the magnetized magnetic ring is configured to have more than 10 magnetic poles.

[0017] According to an embodiment, each magnetic pole of the magnetized magnetic ring consists of a first magnetic segment and a second magnetic segment.

[0018] According to the embodiments, the magnetic ring to be magnetized is formed into an integral ring by molding or injection molding. The material is an isotropic or anisotropic magnet, such as SmFeN or NdFeB, with a remanence Br > 0.5T. For the same volume, the Hd5 of a single magnetic ring at high temperature is < 200kA / m. In this paper, Hd5 is the coercivity at the knee of the JH demagnetization curve of the magnet, which is located at 5% below the remanence Br, i.e., at 0.95Br.

[0019] According to the embodiment, the magnetized magnetic ring is formed by sintering, and the material is SmCo with remanence Br>1.18T, Hd5>1800kA / m, and has a small remanence and coercivity temperature coefficient.

[0020] The magnetization arrangement of this invention can replace expensive pulse magnetization devices, reduce magnetization cycles, and lower manufacturing costs. Furthermore, the orientation of each magnet segment of the Hellbeck magnetic ring obtained through this magnetization arrangement essentially conforms to an ideal Hellbeck magnet array, thereby achieving the desired performance. The Hellbeck magnetic ring obtained using this magnetization arrangement can generate a magnetic field strength 2.5 times that of a single magnetic ring at high temperatures. Attached Figure Description

[0021] The embodiments of the present invention will be explained in more detail in the accompanying drawings, in which:

[0022] Figure 1 This is a schematic diagram of the magnetization arrangement according to an embodiment of the present utility model;

[0023] Figure 2 yes Figure 1 A schematic diagram of the magnetization arrangement in the middle;

[0024] Figure 3 yes Figure 1 The magnetic coercivity curve of the magnetic ring after magnetization;

[0025] Figure 4 yes Figure 1 The magnetic flux curve of the magnetic ring after it has been magnetized.

[0026] Figure 5 This is a schematic diagram of the magnetization arrangement according to another embodiment of the present invention.

[0027] In the accompanying drawings, embodiments of the present invention are shown in a simplified manner for clarity. The drawings are not necessarily shown to scale. Detailed Implementation

[0028] The following reference Figure 1-5 The embodiments of this utility model are described in detail below.

[0029] Figure 1A magnetization arrangement 1 for a Helbeck magnetic ring is shown, comprising a magnetized magnetic ring 10 and a magnetic ring 20 to be magnetized, with the magnetized magnetic ring 10 located outside the magnetic ring 20 to be magnetized. This arrangement is used in an inner rotor configuration. As shown, the magnetized magnetic ring 10 includes a first magnet segment 11 and a second magnet segment 12, the two magnet segments being arranged alternately circumferentially to form a magnetic ring, the first magnet segment and the second magnet segment having different magnetization directions from each other.

[0030] Figure 2 The magnetization structure of the magnetized magnetic ring 10 is shown. For example... Figure 1 and 2 As shown, the magnetized magnetic ring 10 has a segmented structure, comprising a first magnetic segment 11 and a second magnetic segment 12. The two magnetic segments are arranged alternately circumferentially to form a magnetic ring, and the magnetization directions (orientations) of the first magnetic segment 11 and the second magnetic segment 12 are perpendicular to each other. The magnetization direction of the first magnetic segment 11 is radial, and the magnetization direction of the second magnetic segment 12 is tangential or circumferential. The first magnetic segment 11 has a trapezoidal cross-section (the upper and lower bases are located on the outer and inner rings of the magnetized magnetic ring, respectively), and the second magnetic segment 12 has a rectangular cross-section. All first magnetic segments 11 and all second magnetic segments 12 have the same structure.

[0031] Figure 2 It is also shown that the magnetization directions of adjacent first magnet segments 11 in the circumferential direction are opposite to each other, and the magnetization directions of adjacent second magnet segments 12 in the circumferential direction are opposite to each other.

[0032] In this example, the magnetization arrangement is constructed as follows: the ratio of the outer radius R3 of the magnetizing magnetic ring to the outer radius R2 of the magnetic ring to be magnetized is >1.5; the ratio of the inner and outer radii of the magnetic ring to be magnetized, R1 / R2, is <0.92, where R1 is the inner radius of the magnetic ring to be magnetized and R2 is the outer radius of the magnetic ring to be magnetized; the ratio of the arc angle a1 of the first magnet segment 11 on the inner ring of the magnetizing magnetic ring to the arc angle a2 on the outer ring is 1.2-1.8; the arc angle a3 of the second magnet segment on the inner ring of the magnetizing magnetic ring is equal to 360 degrees divided by the number of magnetic poles minus a1, and the arc angle a4 of the second magnet segment on the outer ring of the magnetizing magnetic ring is equal to 360 degrees divided by the number of magnetic poles minus a2; the magnetizing magnetic ring is constructed to have more than 10 magnetic poles, each magnetic pole consisting of a first magnet segment 11 and a second magnet segment 12.

[0033] The magnetized magnetic ring 20 is formed into an integral ring by compression molding or injection molding. The material is an isotropic or anisotropic magnet, such as SmFeN or NdFeB, with a remanence Br > 0.5T. The magnetized magnetic ring 10 is formed by sintering. The material is SmCo, with a remanence Br > 1.18T and Hd5 > 1800kA / m, and has a small remanence and coercivity temperature coefficient.

[0034] Figure 3 and Figure 4 They are Figure 1 The figure shows the coercivity and flux curves of the magnetic ring 20 after magnetization (the left curve represents the magnetic field strength in the radial direction at the inner ring side, and the right curve represents the magnetic field strength in the tangential direction at the inner ring side). As shown in the figure, the minimum coercivity at the inner ring side of the magnetic ring 20 after magnetization is 580 kA / m, and the magnetic field strength in both the tangential and radial directions at the inner ring side is greater than 0.5 T.

[0035] Figure 5 This illustration shows a magnetization arrangement 100 according to another embodiment of the present invention, including a magnetizing magnetic ring 110 and a magnetic ring 120 to be magnetized. The magnetizing magnetic ring 110 includes a first magnet segment 111 and a second magnet segment 112. The dimensional relationships and structure of the magnetization arrangement 110 are similar to those of the present invention. Figure 2 The same as in. The difference is that, Figure 5 In this configuration, the magnetic ring 120 to be magnetized is located outside the magnetizing magnetic ring 110. This arrangement is used for the outer rotor structure. Furthermore, as shown in the figure, the orientation (magnetization direction) of each magnet segment of the magnetizing magnetic ring is... Figure 2 The orientations of the magnet segments shown are opposite.

[0036] The above embodiments illustrate the principles of this invention in specific applications, and the wording and expressions used are illustrative rather than restrictive. Those skilled in the art will understand that the use of such wording and expressions is not intended to exclude any equivalent examples of the illustrated and described features from the scope of this invention. Without exercising inventive capacity, those skilled in the art can make various modifications to the above embodiments in terms of form, use, and implementation details without departing from the principles and concept of this invention as defined in the claims.

[0037] In some cases, the features disclosed in this invention can be used independently of other features. On the other hand, when necessary, the features disclosed in this invention can be combined to provide various combinations.

Claims

1. A magnetization arrangement for a Hellbeck magnetic ring, comprising a magnetizing magnetic ring and a magnetic ring to be magnetized, wherein one magnetic ring is sleeved outside another magnetic ring, characterized in that, The magnetized magnetic ring includes a first magnet segment and a second magnet segment, which are arranged alternately in the circumferential direction to form a magnetic ring. The first magnet segment and the second magnet segment have different magnetization directions.

2. The magnetization arrangement according to claim 1, characterized in that, The magnetization direction of the first magnet segment is radial, and the magnetization direction of the second magnet segment is tangential or circumferential.

3. The magnetization arrangement according to claim 1 or 2, characterized in that, The magnetization directions of adjacent first magnet segments along the circumferential direction are opposite to each other, and the magnetization directions of adjacent second magnet segments along the circumferential direction are also opposite to each other.

4. The magnetization arrangement according to claim 1 or 2, characterized in that, The first magnet segment is constructed with a trapezoidal cross-section, and the second magnet segment is constructed with a rectangular cross-section.

5. The magnetization arrangement according to claim 1 or 2, characterized in that, The magnetizing ring is located outside the magnetizing ring.

6. The magnetization arrangement according to claim 1 or 2, characterized in that, The magnetic ring to be magnetized is located outside the magnetized magnetic ring.

7. The magnetization arrangement according to claim 5, characterized in that, The ratio of the outer radius of the magnetized magnetic ring to the outer radius of the magnetic ring to be magnetized is >1.

5.

8. The magnetization arrangement according to claim 6, characterized in that, The ratio of the outer radius of the magnetic ring to be magnetized to the outer radius of the magnetized magnetic ring is >1.

5.

9. The magnetization arrangement according to claim 1 or 2, characterized in that, The ratio of the inner and outer radii of the magnetic ring to be magnetized is <0.

92.

10. The magnetization arrangement according to claim 1 or 2, characterized in that, The ratio of the arc angle of the first magnet segment on the inner ring of the magnetized magnetic ring to the arc angle on the outer ring is 1.2-1.

8.

11. The magnetization arrangement according to claim 10, characterized in that, The arc angle of the second magnet segment on the inner ring of the magnetized magnetic ring is equal to 360 degrees divided by the number of magnetic poles minus the arc angle of the first magnet segment on the inner ring of the magnetized magnetic ring, and the arc angle of the second magnet segment on the outer ring of the magnetized magnetic ring is equal to 360 degrees divided by the number of magnetic poles minus the arc angle of the first magnet segment on the outer ring of the magnetized magnetic ring.

12. The magnetization arrangement according to claim 1 or 2, characterized in that, The magnetized magnetic ring is constructed to have more than 10 magnetic poles.

13. The magnetization arrangement according to claim 12, characterized in that, Each pole of the magnetized magnetic ring consists of a first magnetic segment and a second magnetic segment.

14. The magnetization arrangement according to claim 1 or 2, characterized in that, The magnetic ring to be magnetized is formed into an integral magnetic ring by isotropic or anisotropic magnets, and is constructed with a remanence Br > 0.5T.

15. The magnetization arrangement according to claim 1 or 2, characterized in that, The magnetized magnetic ring is constructed with a remanence Br > 1.18T and Hd5 > 1800kA / m.

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