A high surface magnetic linear halbach array magnet and a method of manufacturing the same

Abstract

The application discloses a high surface magnetic linear Halbach array magnet and a preparation method thereof, relates to the technical field of magnet manufacturing, and comprises a polar magnet and a transition magnet, the polar magnet and the transition magnet are alternately arranged, the polar magnet and the transition magnet are connected through a magnetically conductive adhesive layer, and the magnetically conductive adhesive layer is used for forming the linear Halbach array magnet; the length of the upper surface of the polar magnet and the length of the lower surface of the polar magnet satisfy the following relationship: 0.2X2 <= X1 < X2. In the application, the structural size design of the polar magnet and the transition magnet is optimized, the magnetic field distribution is optimized, the magnetic field distortion is reduced, and the magnetic field uniformity is improved; by limiting the magnetization direction angle of the two, the magnetic field direction is ensured to be consistent, the superposition efficiency is high, the single-side magnetic field is strengthened, the other-side magnetic field is weakened, and the magnetic field utilization rate is improved; meanwhile, the adhesive layer thickness is accurately controlled by additionally arranging the isolation beads, and the magnetic leakage of the adhesive surface is effectively reduced.

Description

Technical Field

[0001] This invention relates to the field of magnet manufacturing technology, and in particular to a high-surface-magnetic linear Helbeck array magnet and its preparation method. Background Technology

[0002] Helbeck arrays exhibit significant magnetic field advantages due to their unique permanent magnet arrangement structure. By alternating magnet units with different magnetization directions, they can achieve the effect of focusing the magnetic field on one side and weakening the magnetic field on the other side without increasing the size and quantity of magnets. This makes them widely used in many fields such as permanent magnet motors, magnetic sensors, and precision instruments. Linear Helbeck arrays, due to their regular structure, are suitable for linear magnetic circuit requirements and have become a commonly used configuration in industrial fields.

[0003] Traditional linear Helbeck array magnets have the following drawbacks: Structurally, they often employ alternating arrangements of regular rectangular magnets with vertically oriented sides. This structure is not conducive to efficient magnetic field focusing. Especially in high-precision equipment, such as precision measuring devices and advanced linear drive systems, the requirements for magnetic field focusing are extremely high. Traditional structures result in a low peak surface magnetic field on the magnetic enhancement surface, failing to meet the stringent requirements of these devices for high surface magnetic field strength and strong unilateral focusing.

[0004] Secondly, traditional magnet bonding often uses ordinary glue (non-magnetic glue). This type of glue can easily block the magnetic circuit conduction. Blocking the magnetic circuit conduction will weaken the overall surface magnetism and destroy the continuity of the magnetic field, thus leading to a decrease in the uniformity of the magnetic field. Summary of the Invention

[0005] The purpose of this invention is to provide a high-magnetic-surface linear Helbeck array magnet and its preparation method, in order to solve the above-mentioned technical problems.

[0006] The technical solution adopted in this invention is as follows: A high-magnetic-surface linear Helbeck array magnet includes a pole magnet and a transition magnet, wherein the pole magnet and the transition magnet are arranged alternately, and the pole magnet and the transition magnet are connected by a magnetically conductive adhesive layer to form the linear Helbeck array magnet; The poloidal magnet is an isosceles trapezoid, and the lengths of its upper and lower surfaces satisfy the following relationship: 0.2X2≤X1<X2 Wherein, X1 is the length of the upper surface of the polar magnet, and X2 is the length of the lower surface of the polar magnet; The transition magnet is an isosceles trapezoid or an isosceles triangular prism.

[0007] Preferably, the transition magnet is an isosceles trapezoid, and the second wide end face is the lower surface of the transition magnet; the length of the upper surface of the transition magnet and the length of the lower surface of the transition magnet satisfy the following relationship: TD1≤0.8TD2 TD1 is the length of the upper surface of the transition magnet, and TD2 is the length of the lower surface of the transition magnet; The length of the lower surface of the transition magnet and the length of the upper surface of the pole magnet satisfy the following relationship: 0.2X1≤TD2≤X1.

[0008] Preferably, the transition magnet is an isosceles triangular prism, and the length of the lower surface of the transition magnet and the length of the upper surface of the pole magnet satisfy the following relationship: 0.2X1≤TD3≤X1 TD3 is the length of the lower surface of the transition magnet.

[0009] The poloidal magnet is an isosceles trapezoidal body. The poloidal magnet has a first narrow end face and a first wide end face arranged opposite to each other. The first narrow end face is the upper surface of the poloidal magnet, and the first wide end face is the lower surface of the poloidal magnet. The upper surface of the poloidal magnet is the magnetic enhancement surface of the linear Helbeck array magnet, and the lower surface of the poloidal magnet is the magnetic weakening surface of the linear Helbeck array magnet.

[0010] As a further preferred embodiment, the average value of the magnetic peak value of the magnetic enhancement surface of the linear Helbeck array magnet is not less than 130% of the average value of the magnetic weakening surface magnetic peak value.

[0011] Preferably, the angle between the magnetization direction of the poloidal magnet and the centerline of the poloidal magnet is α, where α is 0~1.5°; And / or, the angle between the magnetization direction of the transition magnet and the centerline of the transition magnet is β, where β is 40°~90°.

[0012] Preferably, the thickness of the magnetically conductive adhesive layer is 10μm~500μm; And / or, the interior of the magnetically conductive adhesive layer is provided with magnetically conductive isolation beads or a combination of magnetically conductive isolation beads and non-magnetically conductive isolation beads.

[0013] Preferably, the remanence of the pole magnet and the remanence of the transition magnet satisfy the following relationship: Br （T） ≤Br （J） Among them, Br （T） For the remanence of the transition magnet, Br （J） The remanence of the polar magnet is denoted as .

[0014] Preferably, the magnets at the beginning and end of the linear Helbeck array magnet are either the pole magnets or the transition magnets. The magnets at the beginning and end of the linear Helbeck array magnet are right-angled trapezoids or isosceles triangular bodies.

[0015] A method for fabricating a high-surface-magnetic linear Halebec array magnet, the method comprising: S1. Process neodymium iron boron magnets into polar magnets and transition magnets according to the designed magnetization direction, shape and size; S2. Apply a magnetically conductive adhesive layer to the splicing surface of the polar magnet and the transition magnet and bond them in the specified order; S3. Clean the remaining magnetic bonding layer and bake to cure; S4. Perform surface finishing on the poloidal magnet and the transition magnet to obtain a linear Helbeck array magnet.

[0016] As a further preferred embodiment, in S2, the magnetically conductive adhesive layer is prepared by adding isolation beads to the adhesive and stirring. The diameter of the isolation beads is 10μm to 500μm, the proportion of isolation beads added is 1 to 5% of the weight of the adhesive, and the isolation beads are obtained by mixing magnetically conductive isolation beads and non-magnetically conductive isolation beads in a ratio of 1:(2 to 20).

[0017] The above technical solution has the following advantages or beneficial effects: (1) In this invention, the magnets are connected by a magnetically conductive adhesive layer. An isolation bead is provided in the magnetically conductive adhesive layer, which can effectively reduce the phenomenon of magnetic leakage on the bonding surface between the magnets and also prevent the magnetic circuit conduction from being blocked. This will not affect the overall surface magnetic field of the linear Helbeck array magnet, and improve the continuity and uniformity of the magnetic field of the linear Helbeck array magnet.

[0018] (2) In this invention, by setting each formula, the structural size of the pole magnet and the structural size of the transition magnet of different shapes are limited. This can optimize the magnetic field distribution and magnetic field uniformity of the linear Halebeck array magnet and reduce the magnetic field distortion of the linear Halebeck array magnet.

[0019] (3) In this invention, by limiting the magnetization direction angle of the polar magnet and the transition magnet, it is possible to ensure that the magnetic field direction is consistent and the superposition efficiency is high, thereby strengthening the magnetic field on one side and weakening the magnetic field on the other side, improving the magnetic field utilization rate, so that the linear Helbeck array magnet can be widely used in linear motors, precision linear actuators, precision measuring equipment, new energy linear transmission devices and other fields, especially suitable for high-end equipment with high requirements for magnetic field strength, uniformity and stability. Attached Figure Description

[0020] Figure 1 This is a three-dimensional view of the poloidal magnet in this invention; Figure 2 This is a schematic diagram of the side structure of the poloidal magnet in this invention; Figure 3 This is a perspective view of the transition magnet in this invention when it is an isosceles trapezoid. Figure 4 This is a side view of the transition magnet in this invention when it is an isosceles trapezoid. Figure 5 This is a three-dimensional view of the transition magnet in this invention when it is an isosceles triangular prism; Figure 6 This is a side view of the transition magnet in this invention when it is an isosceles triangular prism; Figure 7 This is a schematic diagram of a linear Helbeck array magnet when the transition magnet is an isosceles trapezoid in this invention; Figure 8 This is a schematic diagram of a linear Helbeck array magnet when the transition magnet is an isosceles triangular prism in this invention; Figure 9 This is a schematic diagram of the magnetization of the poloidal magnet in this invention; Figure 10 This is a magnetization diagram when the transition magnet is an isosceles trapezoid in this invention; Figure 11 This is a magnetization diagram when the transition magnet is an isosceles triangular prism in this invention; Figure 12 This is a schematic diagram of the structure of the linear Helbeck array magnet in this invention, where the first and last magnets are right-angled trapezoids. Figure 13 This is a schematic diagram of the linear Helbeck array magnet in this invention, where the first and last ends are right-angled triangular prisms and right-angled trapezoids. Figure 14 This is a simulation diagram of the magnetic field lines distribution of the Helbeck linear magnet when the transition magnet is an isosceles trapezoid in Example 1; Figure 15 This is a schematic diagram of the simulated surface magnetic distribution of the magnetic enhancement surface of the Helbeck linear magnet when the transition magnet is an isosceles trapezoid in Example 1. Figure 16 This is a schematic diagram of the simulated magnetic distribution on the surface of the Helbeck linear magnet with weakened magnetism when the transition magnet is an isosceles trapezoid in Example 1. Figure 17 This is a measured curve of the magnetic enhancement surface magnetic field of the Helbeck linear magnet when the transition magnet is an isosceles trapezoid in Example 1; Figure 18 This is a simulation diagram of the magnetic field lines distribution of the Helbeck linear magnet when the transition magnet is an isosceles triangular prism in Example 2; Figure 19 This is a schematic diagram of the Heilbeck linear array magnet arrangement in Example 3; Figure 20 This is a simulation diagram of the magnetic field lines distribution of the Heilbeck linear magnet in Example 3; Figure 21 This is a schematic diagram of the simulated surface magnetic distribution of the magnetic reinforcement surface of the Heilbeck linear magnet in Example 3; Figure 22 This is a schematic diagram of the simulated magnetic distribution on the surface of the Heilbeck linear magnet with weakened magnetism in Example 3; Figure 23 This is a measured curve of the magnetic surface magnetic field of the Heilbeck linear magnet in Example 3. Figure 24 This is a schematic diagram of the Hellbeck linear array magnet arrangement in Comparative Example 3; Figure 25 This is a simulation diagram of the magnetic field lines distribution of the Hellbeck linear array magnet in Comparative Example 3; Figure 26 This is a schematic diagram of the Heilbeck linear array magnet arrangement in Example 4; Figure 27 This is a simulation diagram of the magnetic field lines distribution of the Heilbeck linear magnet in Example 4; Figure 28 This is a schematic diagram of the Heilbeck linear array magnet arrangement in Example 5; Figure 29 This is a simulation diagram of the magnetic field lines distribution of the Heilbeck linear magnet in Example 5.

[0021] In the diagram: 1. Polar magnet; 2. Transition magnet; 3. Magnetic enhancement surface; 4. Magnetic weakening surface. Detailed Implementation

[0022] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] In the description of this invention, it should be noted that terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, terms such as "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0024] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0025] See Figure 1-13 As shown, the present invention discloses a high-magnetic linear Helbeck array magnet, which includes a pole magnet 1 and a transition magnet 2. The pole magnet 1 and the transition magnet 2 are arranged alternately, and the pole magnet 1 and the transition magnet 2 are connected by a magnetically conductive adhesive layer to form a linear Helbeck array magnet. Furthermore, as a preferred embodiment, the poloidal magnet 1 is an isosceles trapezoidal body, and the poloidal magnet 1 has a first narrow end face and a first wide end face arranged opposite to each other. The first narrow end face is the upper surface of the poloidal magnet 1, and the first wide end face is the lower surface of the poloidal magnet 1. Specifically, this can be combined with... Figure 2 As shown in the direction, its longitudinal section is narrow at the top (corresponding to the first narrow end face) and wide at the bottom (corresponding to the first wide end face). The length of the upper surface of the polar magnet 1 and the length of the lower surface of the polar magnet 1 satisfy the following relationship: 0.2X2≤X1<X2 Where X1 is the length of the upper surface of the polar magnet 1, and X2 is the length of the lower surface of the polar magnet 1.

[0026] In this invention, the width of the magnetic waveform can be changed by adjusting the length of X1 in the linear Hellbeck array, which can be adjusted according to design requirements.

[0027] Further optimization is that X1 is generally greater than 2mm and less than 200mm, which can reduce the processing difficulty in the actual production process.

[0028] In this invention, compared to traditional rectangular magnets, the pole magnet 1, being an isosceles trapezoid, achieves a stronger magnetic focusing effect on its upper surface. Therefore, this invention requires the length of the upper surface of the pole magnet 1 to be less than the length of its lower surface. Simultaneously, to ensure the waveform of the magnet, X1 ≥ 0.2X2. If the length of the upper surface of the pole magnet 1 is too small, for example, X1 < 0.2X2, it will lead to excessively high local magnetic flux density, resulting in local magnetic saturation, causing waveform distortion and distortion such as clipping and asymmetry.

[0029] Traditional linear Helbeck array magnets often employ alternating arrangements of regular rectangular magnets with vertically oriented sides, a structure that hinders efficient magnetic field convergence. In this invention, the specific dimensions of the poloidal magnet 1 are defined by the relationship 0.2X2≤X1<X2, resulting in an isosceles trapezoidal shape. This isosceles trapezoidal design, compared to traditional rectangular magnets, better guides and converges the magnetic field. Furthermore, the sloping sides of the trapezoid help alter the direction of magnetic field propagation, leading to greater concentration of the magnetic field on the magnetic enhancement surface 3, effectively improving the convergence efficiency and thus increasing the peak surface magnetic field value of the magnetic enhancement surface 3.

[0030] The polar magnet 1 and the transition magnet 2 are connected by a magnetically conductive adhesive layer with a thickness of 10μm to 500μm. The magnetically conductive adhesive layer is equipped with isolation beads inside, which can form a magnetically conductive channel inside the adhesive layer, preventing the adhesive layer from blocking the magnetic circuit conduction and effectively reducing the magnetic leakage phenomenon at the adhesive surface.

[0031] Furthermore, as a preferred embodiment, the insulating beads inside the magnetically conductive adhesive layer are magnetically conductive insulating beads, which form a magnetically conductive channel inside the magnetically conductive adhesive layer.

[0032] Furthermore, as a preferred embodiment, the isolation beads inside the magnetic adhesive layer are magnetic isolation beads and non-magnetic isolation beads, and the isolation beads are obtained by mixing magnetic isolation beads and non-magnetic isolation beads in a quantity ratio of 1:(2~20).

[0033] In a preferred embodiment, the isolation beads are obtained by mixing magnetic isolation beads and non-magnetic isolation beads in a ratio of 1:(8~15).

[0034] Furthermore, as a preferred embodiment, the transition magnet is an isosceles trapezoid or an isosceles triangle.

[0035] The main function of the transition magnet is to serve as a transition zone for magnetic field lines, ensuring no magnetic leakage and a smooth waveform transition in the linear array magnets. Simultaneously, the transition magnet needs to cooperate with the pole magnet; therefore, the transition magnet adopts the shape of an isosceles trapezoid or an isosceles triangular prism. The lower surface of the transition magnet, whether an isosceles trapezoid or an isosceles triangular prism, lies on the magnetic reinforcement surface of the linear array magnets. Its length affects the waveform; too short a length will negatively impact the transition effect.

[0036] Furthermore, in a preferred embodiment, the transition magnet 2 is an isosceles trapezoid, having a second narrow end face and a second wide end face arranged opposite to each other. The second narrow end face is the upper surface of the transition magnet, and the second wide end face is the lower surface of the transition magnet. See also Figure 4 As shown, the longitudinal section of the transition magnet 2 is narrow at the top (corresponding to the second narrow end face) and wide at the bottom (corresponding to the second wide end face).

[0037] The lengths of the upper and lower surfaces of the transition magnet 2 satisfy the following relationship: TD1≤0.8TD2 Where T represents the transition magnet, D represents the length, TD1 is the length of the upper surface of the transition magnet 2, and TD2 is the length of the lower surface of the transition magnet 2. As the transition magnet 2, it does not need to have a magnetic focusing effect on the air gap. Therefore, when the transition magnet 2 is an isosceles trapezoid, the lengths of the upper and lower surfaces of the transition magnet 2 only need to satisfy the relationship TD1≤0.8TD2 to play a transitional role.

[0038] Meanwhile, to avoid affecting the transition effect due to an excessively short lower surface length, the lower surface length of the transition magnet 2 and the upper surface length of the pole magnet 1 satisfy the following relationship: 0.2X1≤TD2≤X1.

[0039] Since the lower surface of the transition magnet 2 is located on the magnetic enhancement surface of the linear Hellbeck array magnet, its length will affect the waveform. If the length is too short, it will affect the transition effect. Therefore, when the transition magnet 2 is an isosceles trapezoid, the length of the lower surface of the transition magnet 2 and the length of the upper surface of the pole magnet 1 should satisfy 0.2X1≤TD2≤X1.

[0040] Furthermore, as a preferred embodiment, the transition magnet 2 is an isosceles triangular prism, that is, its longitudinal section is an isosceles triangle, as detailed in [reference needed]. Figure 5 and Figure 6 As shown, the length of the lower surface of the transition magnet 2 and the length of the upper surface of the pole magnet 1 satisfy the following relationship: 0.2X1≤TD3≤X1 TD3 is the length of the lower surface of the transition magnet 2.

[0041] The lower surface of the transition magnet 2 is located on the magnetic enhancement surface of the linear Hellbeck array magnet. Its length will affect the waveform. If the length is too short, it will affect the transition effect. Therefore, when the transition magnet 2 is an isosceles triangular body, the length of the lower surface of the transition magnet 2 and the length of the upper surface of the pole magnet 1 should satisfy 0.2X1≤TD3≤X1.

[0042] The structure and size of the transition magnet 2 are defined by the relationship 0.2X1≤TD3≤X1, so that when it is matched with the pole magnet 1, the magnetic field distribution can be further optimized, the magnetic field distortion can be reduced, and the magnetic field uniformity can be improved.

[0043] Furthermore, the different shapes and sizes of the transition magnets 2 and the polo magnets 1 work together to make the magnetic field distribution of the entire linear Hellbeck array magnet more reasonable, which can meet the special requirements of different application scenarios for the magnetic field.

[0044] Furthermore, in a preferred embodiment, the upper surface of the polar magnet 1 is a magnetic enhancement surface 3, and the lower surface of the polar magnet 1 is a magnetic weakening surface 4.

[0045] Furthermore, as a preferred embodiment, the average value of the magnetic peak value of the magnetic enhancement surface of the linear Helbeck array magnet is not less than 130% of the average value of the magnetic peak value of the magnetic weakening surface.

[0046] Furthermore, as a preferred embodiment, the angle between the magnetization direction of the poloidal magnet 1 and the center line of the poloidal magnet 1 is α, where α is 0~1.5°, that is, the two are parallel or approximately parallel.

[0047] Furthermore, as a preferred embodiment, the magnetization direction of the pole magnet 1 is as follows: Figure 9 As shown, α is 0°, that is, the magnetization direction of the poloidal magnet 1 is parallel to the center line of the poloidal magnet 1. At this time, the surface magnetism of the linear Helbeck array magnet is higher.

[0048] Furthermore, as a preferred embodiment, the angle between the magnetization direction of the transition magnet 2 and the centerline of the transition magnet 2 is β, where β is 40°~90°. The specific magnetization direction is as follows: Figure 10 As shown.

[0049] Since the polar magnet 1 and the transition magnet 2 are arranged alternately, and the polar magnet 1 is an isosceles trapezoid, while the transition magnet 2 is an isosceles trapezoid or an isosceles triangular prism, the waveform of the linear array magnets can be significantly optimized by adjusting the angle β between the magnetization direction of the transition magnet 2 and the center line passing through the center of the transition magnet 2 to between 40° and 90°.

[0050] In this invention, the Helbeck linear array magnet is assembled by alternating the arrangement of pole magnet 1 and transition magnet 2.

[0051] More preferably, the first and last magnets of the linear array magnet can be either a pole magnet 1 or a transition magnet 2.

[0052] In a further preferred embodiment, where the regularity of the linear array shape is required, the first and last magnets of the linear array can be changed into regular right-angled trapezoids or isosceles triangular bodies.

[0053] In this invention, Figures 9 to 13 The arrow in the image indicates the direction of magnetization.

[0054] Furthermore, as a preferred embodiment, the remanence of the poloidal magnet 1 and the remanence of the transition magnet 2 satisfy the following relationship: Br （T） ≤Br （J） Where J represents a poloidal magnet, Br （T） For the remanence of transition magnet 2, Br （J） The remanence of the poloidal magnet 1.

[0055] To further ensure the waveform of the linear Halebec array magnet, this invention appropriately reduces the remanence Br of the transition magnet. （T） This causes the remanence of the polar magnet Br （J） Remanence of the transition magnet Br （T） Satisfy: Br （T） ≤Br （J） This reduces magnetic leakage.

[0056] In a preferred embodiment, the method for fabricating a high-surface-magnetic linear Helbeck array magnet includes: S1. The neodymium iron boron magnets are processed into polar magnet 1 and transition magnet 2 according to the designed magnetization direction, shape and size; S2. Apply a magnetically conductive adhesive layer to the splicing surface of the polar magnet 1 and the transition magnet 2, and bond them together in the prescribed order. Before bonding the polar magnet 1 and the transition magnet 2, the transition magnet 2 needs to be magnetized in the prescribed magnetization direction, while the polar magnet 1 can be magnetized or not. Pre-magnetizing the bonded magnets can result in a better waveform after the array magnets are magnetized.

[0057] The magnetic bonding layer is prepared by adding isolation beads to the adhesive and stirring. The diameter of the isolation beads is 10μm~500μm and the proportion of isolation beads added is 1~5% of the weight of the adhesive.

[0058] Furthermore, as a preferred implementation method, the isolating bead can be a magnetically conductive isolating bead.

[0059] Furthermore, as a preferred implementation, the isolation beads can be obtained by mixing magnetic isolation beads and non-magnetic isolation beads in a ratio of 1:(2~20). The magnetic isolation beads in the adhesive are distributed in the magnetic bonding layer of the finished array magnet, playing a role in optimizing the waveform. It was also found that only a small number of magnetic isolation beads are needed to optimize the waveform; too many magnetic isolation beads have no further optimization effect. Therefore, a certain proportion of non-magnetic isolation beads are used to replace the magnetic isolation beads to reduce costs.

[0060] Furthermore, as a preferred embodiment, the magnetically conductive insulating beads can be made of ferromagnetic pure metals such as iron, cobalt, and nickel, or other ferromagnetic alloys. Non-magnetically conductive insulating beads can be made of non-ferromagnetic materials such as glass or zirconium oxide.

[0061] S3. Clean the remaining magnetic bonding layer and bake to cure; S4. Perform surface finishing on the poloidal magnet and the transition magnet to obtain a linear Helbeck array magnet.

[0062] Furthermore, as a preferred embodiment, in S4, the surface finishing process includes: cleaning the surfaces of the polar magnet 1 and the transition magnet 2 using a grinding method, then cleaning the polar magnet 1 and the transition magnet 2, and applying a coating to the surfaces of the polar magnet and the transition magnet as appropriate to obtain a linear Helbeck array magnet.

[0063] Example 1 See Figures 14 to 17 As shown, in Embodiment 1, when the shape of the polar magnet 1 is an isosceles trapezoid, the length X1 of the upper surface of the polar magnet 1 is 16mm, the length X2 of the lower surface of the polar magnet 1 is 22mm, the height is 8mm, and the width is 5mm.

[0064] When the transition magnet 2 is an isosceles trapezoid, the length of the upper surface TD1 of the transition magnet 2 is 5mm, the length of the lower surface TD2 is 10mm, the height is 8mm, and the width is 5mm. The polar magnets 1 and transition magnets 2 are arranged alternately, including four transition magnets 2 and four polar magnets 1.

[0065] Before assembly, the transition magnet 2 needs to be magnetized and saturated. The remanence of the poloidal magnet 1 is 14.8 kGs, and the remanence of the transition magnet 2 is 13.9 kGs. The beginning and end of the linear Helbeck array magnet are a transition magnet 2 and a poloidal magnet 1, respectively.

[0066] A magnetically conductive adhesive layer with a thickness of 10μm~12μm exists between the pole magnet 1 and the transition magnet 2. The adhesive contains 3% spacer beads, which are composed of glass beads and pure iron beads in a ratio of 1:10.

[0067] A linear Hellbeck array magnet was prepared according to the method provided in Example 1. After preparation, a Zn coating with a thickness of 10 μm was deposited by electroplating. The surface magnetic distribution of the linear array was simulated using software. Magnetization was performed using a planar multi-stage magnetization fixture, and the surface magnetic properties of the linear array magnet were tested at room temperature (20°C) using a surface magnetic distribution measuring instrument.

[0068] Figure 14 The simulation diagram of the magnetic field lines distribution of the Heilbeck linear magnet shows that the upper surface of the poloidal magnet 1 has a magnetic enhancement surface 3, where the magnetic field lines are more densely distributed. On the other hand, the lower surface of the poloidal magnet 1 has a magnetic weakening surface 4, where the magnetic field lines are relatively sparsely distributed.

[0069] The surface magnetic field at a distance of 0.2 mm perpendicular to the magnetic enhancement surface 3 and magnetic weakening surface 4 of the linear Hellbeck array magnet was simulated using software. The results are as follows: Figure 15 and Figure 16 As shown in the figure. The simulation results show that the average value of the magnetic peak value on the magnetic reinforcement surface 3 is 1.68T, while the average value of the magnetic peak value on the magnetic weakening surface 4 is 0.81T, indicating that the magnetic peak value on the magnetic reinforcement surface 3 is significantly improved.

[0070] Measured magnetic data of the magnetic enhancement surface 3 of the linear Hellbeck array magnet are as follows: Figure 17 As shown, the average peak value of the surface magnetic field is 1.32T, which is 43.5% higher than that of the magnetic weakening surface 4. Meanwhile, the surface magnetic field of the magnetic enhancement surface 3 of the linear Helbeck array magnet has an approximately sinusoidal waveform with a THD of only 2.9%, indicating that the waveform is better.

[0071] Comparative Example 1 When the polar magnet 1 is an isosceles trapezoid, the length X1 of the upper surface of the polar magnet 1 is 15mm, the length X2 of the lower surface of the polar magnet 1 is 14mm, the height is 8mm, and the width is 5mm.

[0072] When the transition magnet 2 is an isosceles trapezoid, the length of the upper surface TD1 of the transition magnet 2 is 18mm, the length of the lower surface TD2 is 16mm, the height is 8mm, and the width is 5mm. The polar magnets 1 and transition magnets 2 are arranged alternately, including four transition magnets 2 and four polar magnets 1.

[0073] Before assembly, the transition magnet 2 needs to be magnetized and saturated. The remanence of the poloidal magnet 1 is 12.5 kGs, and the remanence of the transition magnet 2 is 14.5 kGs. The beginning and end of the linear Helbeck array magnet are a transition magnet 2 and a poloidal magnet 1, respectively.

[0074] A magnetically conductive adhesive layer with a thickness of 10μm~12μm exists between the pole magnet 1 and the transition magnet 2. The adhesive contains 3% spacer beads, which are composed of glass beads and pure iron beads in a ratio of 1:10.

[0075] A linear Hellbeck array magnet was prepared according to the method provided in Comparative Example 1. After preparation, a Zn coating with a thickness of 10 μm was deposited by electroplating. The surface magnetic distribution of the linear array was simulated using software. Magnetization was performed using a planar multi-stage magnetization fixture, and the surface magnetic properties of the linear array magnet were measured at room temperature (20 °C) using a surface magnetic distribution measuring instrument.

[0076] The peak value of the magnetic enhancement surface of the linear Helbeck array magnet was tested, and the average value of the peak value was calculated. It was found that the peak value of the surface magnetic field was 1.01T, which is much lower than the peak value of the magnet in Example 1.

[0077] Example 2 See Figure 18 As shown, in Embodiment 2, when the polar magnet 1 adopts an isosceles trapezoidal shape, the upper surface length X1 of the polar magnet 1 is 14mm, the lower surface length X2 is 18mm, the height is 6mm, and the width is 6mm.

[0078] When the transition magnet 2 is an isosceles triangular prism, the length TD3 of the lower surface of the transition magnet 2 is 6mm, the height is 6mm, and the width is 6mm. The polar magnets 1 and transition magnets 2 are arranged alternately, including four transition magnets 2 and four polar magnets 1.

[0079] Before assembly, the transition magnet 2 needs to be magnetized to saturation. The remanence of the poloidal magnet 1 is 14.5 kGs, and the remanence of the transition magnet 2 is 12.5 kGs. The linear array magnet has a transition magnet 2 and a poloidal magnet 1 at the head and tail, respectively.

[0080] A magnetically conductive adhesive layer exists between two adjacent magnets, with a thickness of 10μm to 12μm. The adhesive contains 3% spacer beads, which are composed of glass beads and pure iron beads in a 1:10 ratio.

[0081] A linear Hellbeck array magnet was prepared according to the method provided in Example 2. After preparation, a Zn coating with a thickness of 10 μm was deposited by electroplating. The surface magnetic distribution of the linear Hellbeck array magnet was simulated using software. Magnetization was performed using a planar multi-stage magnetization fixture, and the surface magnetic properties of the linear Hellbeck array magnet were measured at room temperature (20°C) using a surface magnetic distribution measuring instrument.

[0082] Figure 18 The simulation diagram of the magnetic field lines distribution of the Heilbeck linear magnet shows that the upper surface of the poloidal magnet 1 has a magnetic enhancement surface 3, where the magnetic field lines are more densely distributed. On the other hand, the lower surface of the poloidal magnet 1 has a magnetic weakening surface 4, where the magnetic field lines are relatively sparsely distributed.

[0083] The peak value of the magnetic enhancement surface 3 of the linear Hellbeck array magnet was tested, and the average value of the peak value was calculated. The average value of the peak value was 1.28T, which is 42.7% higher than that of the magnetic weakening surface 4. At the same time, the magnetic enhancement surface 3 of the linear Hellbeck array magnet has an approximately sinusoidal waveform with a THD of only 3.1%, indicating that the waveform is better.

[0084] Comparative Example 2 When the polar magnet 1 is an isosceles trapezoid, the length of the upper surface X1 of the polar magnet 1 is 15mm, the length of the lower surface X2 is 14mm, the height is 6mm, and the width is 6mm.

[0085] When the transition magnet 2 is an isosceles triangular prism, the length TD3 of the lower surface of the transition magnet 2 is 16mm, the height is 6mm, and the width is 6mm. The polar magnets 1 and transition magnets 2 are arranged alternately, comprising four transition magnets 2 and four polar magnets 1.

[0086] Before assembly, the transition magnet 2 needs to be magnetized and saturated. The remanence of the poloidal magnet 1 is 12 kGs, and the remanence of the transition magnet 2 is 14 kGs. The linear array magnet has a transition magnet 2 and a poloidal magnet 1 at the head and tail, respectively.

[0087] A magnetically conductive adhesive layer exists between two adjacent magnets, with a thickness of 10μm to 12μm. The adhesive contains 3% spacer beads, which are composed of glass beads and pure iron beads in a 1:10 ratio.

[0088] A linear Hellbeck array magnet was prepared according to the method provided in Comparative Example 2. After preparation, a Zn coating with a thickness of 10 μm was deposited by electroplating. The surface magnetic distribution of the linear Hellbeck array magnet was simulated using software. Magnetization was performed using a planar multi-stage magnetization fixture, and the surface magnetic properties of the linear Hellbeck array magnet were measured at room temperature (20 °C) using a surface magnetic distribution measuring instrument.

[0089] The peak value of the magnetic enhancement surface of the linear Helbeck array magnet was tested, and the average value of the peak value was calculated. It was found that the peak value of the surface magnetic field was 0.968T, which is much lower than the peak value of the magnet in Example 2.

[0090] Example 3 See Figure 19-23 As shown in this embodiment 3, the polar magnet 1 is an isosceles trapezoid with an upper surface length X1 of 10mm, a lower surface length X2 of 15mm, a height of 8mm, and a width of 5mm.

[0091] The transition magnet 2 is an isosceles trapezoid, with an upper surface length TD1 of 3 mm, a lower surface length TD2 of 8.5 mm, a height of 8 mm, and a width of 5 mm. The polar magnets 1 and transition magnets 2 are arranged alternately, comprising four transition magnets 2 and four polar magnets 1, as shown in the specific arrangement below. Figure 19 As shown.

[0092] Before assembly, the transition magnet 2 needs to be magnetized and saturated. The remanence of the poloidal magnet 1 is 14 kGs, and the remanence of the transition magnet 2 is 13.5 kGs. The beginning and end of the linear Helbeck array magnet are a transition magnet 2 and a poloidal magnet 1, respectively.

[0093] A magnetically conductive adhesive layer with a thickness of 10μm~12μm exists between the pole magnet 1 and the transition magnet 2. The adhesive contains 3% spacer beads, which are composed of glass beads and pure iron beads in a ratio of 1:10.

[0094] A linear Hellbeck array magnet was prepared according to the method provided in Example 3. After preparation, a Zn coating with a thickness of 10 μm was deposited by electroplating. The surface magnetic distribution of the linear array was simulated using software. Magnetization was performed using a planar multi-stage magnetization fixture, and the surface magnetic properties of the linear array magnet were tested at room temperature (20°C) using a surface magnetic distribution measuring instrument.

[0095] Figure 20 The diagram shows a simulation of the magnetic field lines distribution of the Hellbeck linear magnet in Example 3. It can be seen that the upper surface of the pole magnet 1 has a magnetic enhancement surface 3, where the magnetic field lines are more densely distributed. Conversely, the lower surface of the pole magnet 1 has a magnetic weakening surface 4, where the magnetic field lines are relatively sparsely distributed.

[0096] The surface magnetic field at a distance of 0.2 mm perpendicular to the magnetic enhancement surface 3 and magnetic weakening surface 4 of the linear Hellbeck array magnet was simulated using software. The results are as follows: Figure 21 and Figure 22 As shown in the figure. The simulation results show that the average value of the magnetic peak value on the magnetic reinforcement surface 3 is 1.65T, while the average value of the magnetic peak value on the magnetic weakening surface 4 is 0.804T, indicating that the magnetic peak value on the magnetic reinforcement surface 3 is significantly improved.

[0097] Measured magnetic data of the magnetic enhancement surface 3 of the linear Hellbeck array magnet are as follows: Figure 23 As shown, the average peak value of the surface magnetic field is 1.15T, which is 42.3% higher than that of the magnetic weakening surface. Meanwhile, the surface magnetic field of the magnetic enhancement surface 3 of the linear Helbeck array magnet has an approximately sinusoidal waveform with a THD of only 3.1%, indicating that the waveform is better.

[0098] in, Figure 19 The middle arrow indicates the direction of magnetization.

[0099] Comparative Example 3 See Figure 24-25 As shown in Comparative Example 3, both the polar magnet 1 and the transition magnet 2 are rectangular. The polar magnet 1 has a length of 10 mm, a height of 8 mm, and a width of 5 mm.

[0100] The transition magnet 2 is 3mm long, 8mm high, and 5mm wide. The polar magnets 1 and transition magnets 2 are arranged alternately, comprising four transition magnets 2 and four polar magnets 1, as shown in the specific arrangement below. Figure 24 As shown. The rest of the magnet configuration is the same as in Example 3. Wherein, Figure 24 The middle arrow indicates the direction of magnetization.

[0101] Figure 25 The figure shows a simulation of the magnetic field lines distribution of the linear Hellbeck array magnets in Comparative Example 3. It can be seen from the figure that the magnetic field lines are distributed relatively evenly on the magnetic enhancement surface 3 and the magnetic weakening surface 4, indicating that the arrangement of the magnets in Comparative Example 3 has no significant effect on enhancing the magnetic properties on one side.

[0102] The surface magnetic flux of the magnetic enhancement surface 3 of the linear Helbeck array magnet was tested, and the average peak value of the surface magnetic flux was 1.31 T, which is much lower than that of Example 3. At the same time, the THD of the magnet in Comparative Example 3 was 5%, indicating that the magnet waveform deviated significantly from the sine wave. The trapezoidal structure used in this invention is beneficial for enhancing the peak value of the surface magnetic flux of the magnetic enhancement surface 3 of the Helbeck linear array magnet.

[0103] In this invention, the dimensions of the upper and lower surface lengths of the pole magnet 1 affect the surface magnetization enhancement effect. Therefore, in this invention, it is generally required that when viewed from the trapezoidal side of the magnet 1, the upper surface length of the trapezoid is X1, the lower surface length is X2, and X1 and X2 have the following relationship: 0.2X2≤X1<X2 When the transition magnet 2 is an isosceles trapezoid, viewed from the side, the length of the upper surface of the transition magnet 2 is TD1, the length of the lower surface is TD2, and TD1 and TD2 have the following relationship: TD1≤0.8TD2 Furthermore, the length of the lower surface of the transition magnet 2, TD3, and the length of the upper surface of the pole magnet 1, X1, satisfy the following: 0.2X1≤TD3≤X1 Example 4 See Figure 26-27 As shown, in this embodiment 4, the polar magnet 1 adopts an isosceles trapezoidal shape, wherein the upper surface length X1 of the polar magnet 1 is 8mm, the lower surface length X2 is 10mm, the height is 6mm, and the width is 6mm.

[0104] The transition magnet 2 is an isosceles triangular prism, with a lower surface length TD3 of 2mm, a height of 6mm, and a width of 6mm. The polar magnets 1 and transition magnets 2 are arranged alternately, comprising four transition magnets 2 and four polar magnets 1, as shown in the specific arrangement below. Figure 26 As shown.

[0105] Before assembly, the transition magnet 2 needs to be magnetized to saturation. The remanence of the poloidal magnet 1 is 14.2 kGs, and the remanence of the transition magnet 2 is 13.8 kGs. The linear array magnet has a transition magnet 2 and a poloidal magnet 1 at the head and tail, respectively.

[0106] A magnetically conductive adhesive layer exists between two adjacent magnets, with a thickness of 10μm to 12μm. The adhesive contains 3% spacer beads, which are composed of glass beads and pure iron beads in a 1:10 ratio.

[0107] A linear Hellbeck array magnet was prepared according to the method provided in Example 4. After preparation, surface treatment was performed, and a Zn coating with a thickness of 10 μm was deposited by electroplating. The surface magnetic distribution of the linear Hellbeck array magnet was simulated using software. Magnetization was performed using a planar multi-stage magnetization fixture, and the surface magnetic properties of the linear Hellbeck array magnet were measured at room temperature (20°C) using a surface magnetic distribution measuring instrument.

[0108] in, Figure 26 The middle arrow indicates the direction of magnetization.

[0109] Figure 27 The diagram shows a simulation of the magnetic field lines distribution of the Hellbeck linear magnet in Example 4. It can be seen that the upper surface of the pole magnet 1 has a magnetic enhancement surface 3, where the magnetic field lines are more densely distributed. Conversely, the lower surface of the pole magnet 1 has a magnetic weakening surface 4, where the magnetic field lines are relatively sparsely distributed.

[0110] The surface magnetic field of the linear Hellbeck array magnet was tested using a surface magnetic distribution measuring instrument. The average peak value of the surface magnetic field of the magnetic enhancement surface 3 was 1.22T, which is 38.6% higher than that of the magnetic weakening surface 4. At the same time, the surface magnetic field distribution of the magnetic enhancement surface 3 of the linear Hellbeck array magnet is approximately sinusoidal, with a THD of only 2.85%.

[0111] Comparative Example 4 In Comparative Example 4, the remanence of the pole magnet 1 and the transition magnet 2 of the linear Hellbeck array magnet is 14.2 kGs. The rest of the settings of the linear Hellbeck array magnet are the same as those in Example 4.

[0112] The surface magnetic field of the linear Hellbeck array magnet was tested using a surface magnetic field distribution meter. The average peak value of the surface magnetic field of the magnetic enhancement surface 3 was 1.10T, which was 28.6% higher than that of the magnetic weakening surface 4. The THD of the linear Hellbeck array magnet was 4.6%, which was higher than that of Example 4, indicating that the waveform deteriorated.

[0113] Example 5 See Figures 28-29 As shown in this embodiment 5, the polar magnet 1 is an isosceles trapezoid with an upper surface length X1 of 10 mm, a lower surface length X2 of 15 mm, a height of 8 mm, and a width of 5 mm.

[0114] The transition magnet 2 is an isosceles trapezoid, with an upper surface length TD1 of 3 mm, a lower surface length TD2 of 8.5 mm, a height of 8 mm, and a width of 5 mm. The pole magnets 1 and transition magnets 2 are arranged alternately, comprising four transition magnets 2 and four pole magnets 1. In this embodiment 5, the first and last magnets of the linear Helbeck array magnet are right-angled trapezoids, specifically as shown below. Figure 28 As shown.

[0115] Before assembly, the transition magnet 2 needs to be magnetized and saturated. The remanence of the pole magnet 1 is 13.6 kGs, and the remanence of the transition magnet 2 is 12.5 kGs. A magnetically conductive adhesive layer with a thickness of 10 μm to 12 μm exists between the pole magnet 1 and the transition magnet 2.

[0116] The proportion of isolation beads added to the glue is 3%, and the isolation beads are composed of glass beads and pure iron beads, with the ratio of pure iron beads to glass beads being 1:10.

[0117] A linear Hellbeck array magnet was prepared according to the method provided in Example 5. After preparation, a Zn coating with a thickness of 10 μm was deposited by electroplating. The surface magnetic distribution of the linear Hellbeck array magnet was simulated using software. Magnetization was performed using a planar multi-stage magnetization fixture, and the surface magnetic properties of the linear Hellbeck array magnet were measured at room temperature (20°C) using a surface magnetic distribution measuring instrument.

[0118] in, Figure 28 The middle arrow indicates the direction of magnetization.

[0119] Figure 29 The diagram shows a simulation of the magnetic field lines distribution of the Hellbeck linear magnet in Example 5. It can be seen that the upper surface of the pole magnet 1 has a magnetic enhancement surface 3, where the magnetic field lines are more densely distributed. Conversely, the lower surface of the pole magnet 1 has a magnetic weakening surface 4, where the magnetic field lines are relatively sparsely distributed.

[0120] The surface magnetic field of the linear Hellbeck array magnet was tested using a surface magnetic distribution meter. The average peak value of the surface magnetic field on the magnetic enhancement surface 3 was 0.95T, which is 40.6% higher than that on the magnetic weakening surface 4. Simultaneously, the surface magnetic field distribution on the magnetic enhancement surface 3 of the linear Hellbeck array magnet approximates a sine wave, with a THD of only 3.15%. In this invention, when a regular shape is required for the linear Hellbeck array magnet, the first and last magnets of the linear Hellbeck array magnet can be changed to a regular shape, while the surface magnetic field waveform still approximates a sine wave, and the THD remains at a low level.

[0121] Comparative Example 5: In Comparative Example 5, the arrangement of the pole magnet 1 and the transition magnet 2 is the same as in Example 5, the difference being that Comparative Example 5 uses a non-magnetic adhesive layer. The surface magnetic field of the linear Hellbeck array magnet was tested using a surface magnetic field distribution meter. The average peak value of the surface magnetic field on the magnetic enhancement surface 3 was 0.92 T, an increase of 38.5% compared to the magnetic weakening surface 4, while the average peak value of the surface magnetic field decreased. Simultaneously, the THD of the linear Hellbeck array magnet was 5.8%, an increase compared to Example 5, indicating a deterioration in the sinusoidal waveform.

[0122] Comparative Example 6: The arrangement of the pole magnet 1 and transition magnet 2 in Comparative Example 6 is the same as in Example 5, except that the transition magnet 2 is not magnetized before the linear Hellbeck array magnet is assembled in Comparative Example 6. The surface magnetic field of the linear Hellbeck array magnet was tested using a surface magnetic field distribution meter. The average peak value of the surface magnetic field on the magnetic enhancement surface 3 was 0.89T, which is 36.5% higher than that on the magnetic weakening surface 4, although the average peak value of the surface magnetic field was lower. Meanwhile, the THD of the linear array magnet was 6.8%, which is higher than that in Example 5, indicating a deterioration in the sinusoidal waveform.

[0123] Example 6 In this embodiment 6, the polar magnet 1 is an isosceles trapezoid with an upper surface length X1 of 10mm, a lower surface length X2 of 15mm, a height of 8mm, and a width of 5mm.

[0124] The transition magnet 2 is an isosceles trapezoid, with an upper surface length TD1 of 3 mm, a lower surface length TD2 of 8.5 mm, a height of 8 mm, and a width of 5 mm. The pole magnets 1 and transition magnets 2 are arranged alternately, comprising four transition magnets 2 and four pole magnets 1. In this embodiment 6, the first and last magnets of the linear Helbeck array magnet are right-angled trapezoids.

[0125] Before assembly, the transition magnet 2 needs to be magnetized and saturated. The remanence of the pole magnet 1 is 13.6 kGs, and the remanence of the transition magnet 2 is 12.5 kGs. A magnetically conductive adhesive layer with a thickness of 10 μm exists between the pole magnet 1 and the transition magnet 2.

[0126] The adhesive contains 3% spacer beads, which are composed of glass beads and pure iron beads in a 1:10 ratio. The diameter of the spacer beads is 10 μm.

[0127] A linear Hellbeck array magnet was prepared according to the method provided in Example 6. After preparation, a Zn coating was deposited by electroplating with a thickness of 10 μm. Magnetization was performed using a planar multi-stage magnetization fixture, and the surface magnetism of the linear Hellbeck array magnet was tested at room temperature (20°C) using a surface magnetic distribution measuring instrument.

[0128] The average peak magnetic field value of the magnetic enhancement surface 3 is 0.95T, which is 40.6% higher than that of the magnetic weakening surface 4. Simultaneously, the magnetic distribution on the magnetic enhancement surface 3 of the linear Helbeck array magnet approximates a sine wave, with a THD of 3.02%. In this invention, a magnetically conductive adhesive layer is needed to connect the pole magnet 1 and the transition magnet 2 into a whole, thereby ensuring that the magnet has a good sine wave. However, a thin magnetically conductive adhesive layer will reduce the bonding strength of the magnetic ring, thus affecting its normal use. Therefore, the thinnest magnetically conductive adhesive layer in this invention is 10μm.

[0129] Example 7 In this embodiment 7, the polar magnet 1 is an isosceles trapezoid with an upper surface length X1 of 10mm, a lower surface length X2 of 15mm, a height of 8mm, and a width of 5mm.

[0130] The transition magnet 2 is an isosceles trapezoid, with an upper surface length TD1 of 3 mm, a lower surface length TD2 of 8.5 mm, a height of 8 mm, and a width of 5 mm. The pole magnets 1 and transition magnets 2 are arranged alternately, comprising four transition magnets 2 and four pole magnets 1. In this embodiment 7, the first and last magnets of the linear Helbeck array magnet are right-angled trapezoids.

[0131] Before assembly, the transition magnet 2 needs to be magnetized and saturated. The remanence of the pole magnet 1 is 13.6 kGs, and the remanence of the transition magnet 2 is 12.5 kGs. A magnetically conductive adhesive layer with a thickness of 500 μm exists between the pole magnet 1 and the transition magnet 2.

[0132] The adhesive contains 3% spacer beads, which are composed of glass beads and pure iron beads in a 1:10 ratio. The diameter of the spacer beads is 500 μm.

[0133] A linear Hellbeck array magnet was prepared according to the method provided in Example 7. After preparation, a Zn coating was deposited by electroplating with a thickness of 10 μm. The magnetization was performed using a planar multi-stage magnetization fixture, and the surface magnetism of the linear Hellbeck array magnet was tested at room temperature (20°C) using a surface magnetic distribution measuring instrument.

[0134] The surface magnetic field of the linear Hellbeck array magnet was tested using a surface magnetic distribution meter. The average peak value of the surface magnetic field on the magnetic enhancement surface 3 was 0.93 T, which is 40.6% higher than that on the magnetic weakening surface 4. Simultaneously, the surface magnetic distribution on the magnetic enhancement surface 3 of the linear Hellbeck array magnet approximates a sine wave, with a THD of only 3.28%. In this invention, a magnetically conductive adhesive layer is needed to connect the pole magnet 1 and the transition magnet 2 into a whole, thereby ensuring that the magnet has a good sine wave. However, a thicker magnetically conductive adhesive layer will increase the THD of the magnetic ring waveform; therefore, in this invention, the thickness of the magnetically conductive adhesive layer is within 500 μm.

[0135] The above description is merely a preferred embodiment of the present invention and does not limit the implementation and protection scope of the present invention. Those skilled in the art should realize that any equivalent substitutions and obvious changes made based on the description and illustrations of the present invention should be included within the protection scope of the present invention.

Claims

1. A high-magnetic-surface linear Halebec array magnet, characterized in that, It includes a polar magnet and a transition magnet, the polar magnet and the transition magnet are arranged alternately, and the polar magnet and the transition magnet are connected by a magnetically conductive adhesive layer to form the linear Helbeck array magnet; The lengths of the upper and lower surfaces of the poloidal magnet satisfy the following relationship: 0.2X2≤X1<X2 Wherein, X1 is the length of the upper surface of the polar magnet, and X2 is the length of the lower surface of the polar magnet.

2. The high-magnetic-surface linear Halebeck array magnet as described in claim 1, characterized in that, The transition magnet is an isosceles trapezoid, and the length of the upper surface of the transition magnet and the length of the lower surface of the transition magnet satisfy the following relationship: TD1≤0.8TD2 TD1 is the length of the upper surface of the transition magnet, and TD2 is the length of the lower surface of the transition magnet; The length of the lower surface of the transition magnet and the length of the upper surface of the pole magnet satisfy the following relationship: 0.2X1≤TD2≤X1.

3. The high-magnetic-surface linear Halebeck array magnet as described in claim 1, characterized in that, The transition magnet is an isosceles triangular prism, and the length of the lower surface of the transition magnet and the length of the upper surface of the pole magnet satisfy the following relationship: 0.2X1≤TD3≤X1 TD3 is the length of the lower surface of the transition magnet.

4. The high-magnetic-surface linear Halebeck array magnet as described in claim 1, characterized in that, The poloidal magnet is an isosceles trapezoidal body. The poloidal magnet has a first narrow end face and a first wide end face arranged opposite to each other. The first narrow end face is the upper surface of the poloidal magnet, and the first wide end face is the lower surface of the poloidal magnet. The upper surface of the poloidal magnet is the magnetic enhancement surface of the linear Helbeck array magnet, and the lower surface of the poloidal magnet is the magnetic weakening surface of the linear Helbeck array magnet.

5. The high-magnetic-surface linear Halebeck array magnet as described in claim 4, characterized in that, The average value of the magnetic peak value on the magnetic enhancement surface of the linear Helbeck array magnet is not less than 130% of the average value of the magnetic peak value on the magnetic weakening surface.

6. The high-magnetic-surface linear Halebeck array magnet as described in claim 1, characterized in that, The angle between the magnetization direction of the poloidal magnet and the center line of the poloidal magnet is α, where α is 0~1.5°; And / or, the angle between the magnetization direction of the transition magnet and the centerline of the transition magnet is β, where β is 40°~90°.

7. The high-magnetic-surface linear Halebeck array magnet as described in claim 1, characterized in that, The thickness of the magnetically conductive adhesive layer is 10μm~500μm; And / or, the interior of the magnetically conductive adhesive layer is provided with magnetically conductive isolation beads or a combination of magnetically conductive isolation beads and non-magnetically conductive isolation beads.

8. The high-magnetic-surface linear Halebeck array magnet as described in claim 1, characterized in that, The remanence of the pole magnet and the remanence of the transition magnet satisfy the following relationship: Br （T） ≤Br （J） Among them, Br （T） For the remanence of the transition magnet, Br （J） The remanence of the polar magnet is denoted as .

9. The high-magnetic-surface linear Halebeck array magnet as described in claim 1, characterized in that, The magnets at the beginning and end of the linear Helbeck array magnet are either the pole magnets or the transition magnets. The magnets at the beginning and end of the linear Helbeck array magnet are right-angled trapezoids or isosceles triangular bodies.

10. A method for preparing a high-surface-magnetic linear Halebec array magnet, used to prepare the high-surface-magnetic linear Halebec array magnet according to any one of claims 1-9, characterized in that, The preparation method includes: S1. Process neodymium iron boron magnets into polar magnets and transition magnets according to the designed magnetization direction, shape and size; S2. Apply a magnetically conductive adhesive layer to the splicing surface of the polar magnet and the transition magnet and bond them in the specified order; S3. Clean the remaining magnetic bonding layer and bake to cure; S4. Perform surface finishing on the poloidal magnet and the transition magnet to obtain a linear Helbeck array magnet.

11. The method for preparing a high-magnetic-surface linear Halebec array magnet as described in claim 10, characterized in that, In S2, the magnetically conductive adhesive layer is prepared by adding isolation beads to the adhesive and stirring. The diameter of the isolation beads is 10μm~500μm, and the proportion of isolation beads added is 1~5% of the weight of the adhesive. The isolation beads are magnetically conductive isolation beads or magnetically conductive isolation beads and non-magnetically conductive isolation beads are mixed in a ratio of 1:(2~20).

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