Halbach magnet array magnetic ring without permanent magnets

Abstract

The application discloses a Halbach magnetic array magnetic ring without permanent magnet, a back yoke, the bottom of the back yoke is fixed with a conductive ring, a plurality of superimposed magnetic rings are embedded in the inner side of the back yoke, the magnetic ring is composed of a plurality of magnetic blocks, the adjacent sides of two magnetic blocks are fixed together, and two main conductive terminals are electrically connected with two auxiliary conductive terminals, the application replaces the permanent magnet with the electromagnetic coil, controls the current through the electromagnetic coil to generate the magnetic field sufficient to replace the permanent magnet, controls the magnetic pole distribution of the electromagnetic coil by controlling the current direction, and then wakes up the magnetic field of the assembled magnetic ring, and the magnetic field is further enhanced after being arranged by the Halbach magnetic array. Especially in the assembly of the magnetic steel of the small size Halbach array, the magnetic blocks of the Halbach array do not generate the mutual repulsion force during the assembly, the overall installation is extremely easy, and the installation difficulty can be further reduced.

Description

Technical Field

[0001] This invention relates to a Helbeck magnetic array ring without permanent magnets, belonging to the field of acoustic technology. Background Technology

[0002] Hellbeck magnetic arrays utilize a special arrangement of magnet units to enhance the field strength per unit direction, aiming to generate the strongest magnetic field with the fewest possible magnets. This array is entirely composed of rare-earth permanent magnet materials. By arranging permanent magnets with different magnetization directions according to a certain pattern, it can concentrate magnetic field lines on one side of the magnets while weakening them on the other, thus obtaining a relatively ideal unilateral magnetic field. Hellbeck magnetic arrays have many applications, including in electroacoustic devices. The figure shows a linear Hellbeck magnetic array and its magnetic field distribution. Its strong magnetic surface is in one direction, while the magnetic field is very small on the opposite side.

[0003] For practical applications, taking the electroacoustic industry as an example: the magnetic field of traditional dynamic headphone units is guided to the voice coil by a washer. However, relying solely on washer guidance cannot effectively exert the magnetic force due to magnetic leakage. In order to effectively exert the magnetic field, a Helbeck array is designed to generate the strongest magnetic field with the least amount of magnets, and can also reduce distortion caused by uneven magnetic field.

[0004] When assembling the Helbeck magnetic array rings used in loudspeakers, small magnets are magnetized and then assembled. Especially when assembling the magnets of small-sized Helbeck arrays, the magnetic blocks in the Helbeck array will generate mutual repulsive forces during assembly. Therefore, the repulsive force is directly proportional to the degree of completion of the magnetic block installation. The repulsive force is the greatest and most difficult when installing the last few magnetic blocks. Furthermore, the installation must be completed before the glue cures, and the installation must be maintained until the glue is completely cured, which multiplies the installation difficulty.

[0005] Therefore, the present invention provides a Helbeck magnetic array ring without permanent magnets and which is easy to replace and reuse with magnetic poles and electromagnetic coils. Summary of the Invention

[0006] To address the shortcomings of existing technologies, the present invention aims to provide a Hellbeck magnetic array ring without permanent magnets. This solves the problem that existing technologies generate mutual repulsive forces when assembling the magnetic blocks of the Hellbeck array. Therefore, the repulsive force is directly proportional to the degree of completion of the installation of the magnetic blocks, especially when installing the last few magnetic blocks, which is quite difficult. Furthermore, the installation must be completed before the glue cures and must be kept until the glue is completely cured, which multiplies the installation difficulty.

[0007] To achieve the above objectives, the present invention is implemented through the following technical solution: A Helbeck magnetic array ring without permanent magnets includes: A back yoke, wherein a conductive ring is fixedly provided at the bottom of the back yoke; Several superimposed magnetic rings are embedded in the inner side of the back yoke. Each magnetic ring is composed of several magnetic blocks, and the adjacent sides of two magnetic blocks are fixed together. The magnetic block includes an outer shell with a through hole in the middle and an inner shell that is slidably installed in the through hole of the outer shell. An electromagnetic coil is embedded inside the inner shell. A set of symmetrical main conductive terminals are embedded at both ends of the inner shell. A set of symmetrical secondary conductive terminals are embedded on the annular surface of the inner shell. The two ends of the electromagnetic coil are electrically connected to the two main conductive terminals, and the two main conductive terminals are correspondingly electrically connected to the two secondary conductive terminals. An outer conductive terminal is embedded on the side of the outer shell, and the outer conductive terminal is in contact with the secondary conductive terminals.

[0008] As a further improvement, the back yoke also includes an outer ring sleeve, on the inner ring side of which a ring plate is fixedly mounted, and the conductive ring is embedded in the ring plate, the conductive ring being in contact with the outer conductive terminal.

[0009] As a further improvement, the magnetic block includes four types: a first magnetic block, a second magnetic block, a third magnetic block, and a fourth magnetic block. The energizing direction of the first magnetic block is opposite to that of the fourth magnetic block, the energizing direction of the second magnetic block is opposite to that of the fourth magnetic block, the energizing directions of the first magnetic block and the second magnetic block are perpendicular to each other, and the energizing directions of the third magnetic block and the fourth magnetic block are perpendicular to each other.

[0010] As a further improvement, the outer shell of the first magnetic block is inserted into the inner shell from the outer ring shaft toward the edge, and the main conductive terminal at the output end is in contact with the inner side of the outer ring.

[0011] As a further improvement, the outer shell of the third magnetic block is inserted into the inner shell from the edge of the outer ring towards the axis, and the main conductive terminal at the input end is in contact with the inner side of the outer ring.

[0012] As a further improvement, the outer shell of the second magnetic block is inserted into the inner shell from the first magnetic block toward the third magnetic block, and the main conductive terminal of the input end is attached to the outer shell of the first magnetic block.

[0013] As a further improvement, the outer shell of the fourth magnetic block is inserted into the inner shell from the direction of the third magnetic block toward the second magnetic block, and the main conductive terminal of the output end is attached to the outer shell of the third magnetic block.

[0014] The beneficial effects of this invention are: This invention replaces permanent magnets with electromagnetic coils. Controlling the current flowing through the electromagnetic coils generates a magnetic field sufficient to replace the permanent magnets. By controlling the current flow, the magnetic pole distribution of the electromagnetic coils is controlled, and these are arranged in a Hellbeck magnetic array to form a magnetic ring. During installation, because the ring is in a non-magnetic state, it can be easily and precisely assembled. Once the adhesive has completely solidified, the electromagnetic coils are charged, activating the magnetic field of the assembled magnetic ring. After being arranged in a Hellbeck magnetic array, its magnetic field is further enhanced. Especially when assembling small-sized Hellbeck array magnets, the lack of mutual repulsion between the magnetic blocks during assembly makes overall installation extremely easy, further reducing installation difficulty. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0016] Figure 1 This is a three-dimensional structural schematic diagram of a Halbec magnetic array ring without permanent magnets according to the present invention.

[0017] Figure 2 This is a top view schematic diagram of a Helbeck magnetic array ring without permanent magnets according to the present invention.

[0018] Figure 3 This is a three-dimensional structural schematic diagram of a Halbec magnetic array ring without permanent magnets according to the present invention.

[0019] Figure 4 This is a top view schematic diagram of a Helbeck magnetic array ring without permanent magnets according to the present invention.

[0020] Figure 5 This is a three-dimensional structural schematic diagram of a Halbec magnetic array ring without permanent magnets according to the present invention.

[0021] Figure 6 This is a top view schematic diagram of a Helbeck magnetic array ring without permanent magnets according to the present invention.

[0022] Figure 7 This is a three-dimensional structural schematic diagram of a Halbec magnetic array ring without permanent magnets according to the present invention.

[0023] Figure 8 This is a top view schematic diagram of a Helbeck magnetic array ring without permanent magnets according to the present invention. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. 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. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to represent selected embodiments of the 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.

[0025] In the description of this invention, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0026] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" 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. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0027] In existing Hellbeck arrays, the magnetic blocks generate mutual repulsive forces during assembly. Therefore, this repulsive force is directly proportional to the degree of completion of the magnetic block installation, especially when installing the last few blocks, which is particularly difficult. Furthermore, installation must be completed before the adhesive cures, and the blocks must remain in place until the adhesive is completely cured, significantly increasing the installation difficulty. Therefore, to solve the above-mentioned technical problems, this invention discloses the following technical solution: Reference Figure 1-8 As shown, a Heilbeck magnetic array ring without permanent magnets includes a back yoke 1, with a conductive ring 11 fixed at the bottom of the back yoke 1; and several stacked magnetic rings 2, which are embedded inside the back yoke 1. Each magnetic ring 2 is composed of several magnetic blocks 21, and the adjacent sides of two magnetic blocks 21 are fixed together. The magnetic block 21 includes an outer shell 211 with a through hole in the middle and an inner shell 212 slidably installed in the through hole of the outer shell 211. An electromagnetic coil 213 is embedded inside the inner shell 212. A set of symmetrical main conductive terminals 214 are embedded at both ends of the inner shell 212. A set of symmetrical secondary conductive terminals 215 are embedded on the circumferential surface of the inner shell 212. The two ends of the electromagnetic coil 213 are electrically connected to the two main conductive terminals 214, and the two main conductive terminals 214 are correspondingly electrically connected to the two secondary conductive terminals 215. An outer conductive terminal 216 is embedded on the side of the outer shell 211, and the outer conductive terminal 216 is in contact with the secondary conductive terminal 215.

[0028] Currently, the smallest magnet produced by magnet factories is 0.2mm×0.2mm×0.2mm, and the thickness of the electroplating layer is 0.25mm. Gluing such small, pre-magnetized magnets together, while ensuring that their north, south, and lateral directions are fixed as required, is technically quite difficult. The existing solution is to use a scanning magnetizer to arrange the small magnets into the desired array before magnetization and then firmly fix them with glue or other methods as required. This is relatively easy. Then, a new scanning magnetizer is used to magnetize the arranged small magnets. However, this method has high equipment requirements, and if errors occur during the magnetization process, resulting in incomplete magnetization or unmagnetized areas, it is extremely difficult to detect in time after multiple layers are stacked.

[0029] In this embodiment, permanent magnets are completely removed, and a magnetic ring 2 can be formed by setting up four different types of magnetic blocks 21 in a fixed combination form that conforms to the rules of the Hellbeck magnetic array. This replaces the permanent magnets, allowing multiple sets of magnetic blocks 21 to complete the fabrication of the Hellbeck magnetic array magnetic ring without the participation of permanent magnets.

[0030] Since the Hellbeck magnetic array uses a special arrangement of magnetic units to enhance the field strength in a unit direction, it can be combined in various ways according to actual needs. In this embodiment, it is mainly for small magnets. By setting an electromagnetic coil 213 to replace the permanent magnet, the current is controlled to pass through the electromagnetic coil 213 to generate a magnetic field sufficient to replace the permanent magnet. By controlling the direction of the current, the magnetic pole distribution of the electromagnetic coil 213 is controlled, and the magnetic ring 2 is formed by arranging the Hellbeck magnetic array.

[0031] The existing magnetic ring 2, which uses permanent magnets for Heilbeck magnetic array arrangement, requires cutting the permanent magnets. The cut permanent magnets have a fixed shape and are glued together. Therefore, it can only be reused as a whole; when part of the magnetic ring 2 is damaged, the entire ring must be discarded. In contrast, the electromagnetic coil 213 uses the inner shell 212 as the main carrier, and is embedded inside the inner shell 212, with the outer shell 211 as the secondary carrier. The inner shell 212 containing the electromagnetic coil 213 can be inserted into the outer shell 211. Since the formation of the magnetic ring 2 mainly involves… By bonding the outer shells 211 together, and by configuring different shapes of outer shells 211 according to different combinations, they can be matched and installed with the same inner shell 212 that has the electromagnetic coil 213 fixed thereon. This greatly increases the upper limit of the combination of Heilbeck magnetic array blocks 21, and the inner shell 212 can be reused by discarding the outer shells 211 that are fixed together. In this embodiment, the outer shell 211 is a quadrangular prism. In other embodiments, it can also be a square, a triangle or other common geometric shape, or a shape specially designed to adapt to special environmental structures.

[0032] In this embodiment, to further facilitate the connection after the outer shell 211 is coated with adhesive, a set of symmetrical water droplet grooves 218 are provided on one side of the outer shell 211. The water droplet grooves 218 can accumulate adhesive, preventing it from dripping easily, and can ensure a certain amount of adhesive accumulation, thereby making the adhesion more secure. It should be emphasized that the surface of the water droplet grooves 218 needs to be parallel to the axis of the electromagnetic coil 213, and must not be on the same plane as the external conductor terminal 216.

[0033] Since the electromagnetic coil 213 requires a current supply to generate a magnetic field, the back yoke 1 also includes an outer ring sleeve 12. An inner ring plate 13 is fixedly mounted on the inner side of the outer ring sleeve 12, and a conductive ring 11 is embedded in the ring plate 13, with the conductive ring 11 in contact with the outer conductive terminal 216. By connecting the conductive ring 11 to an external power source, a stable current supply can be continuously provided to the electromagnetic coil 213, maintaining a stable magnetic field. In this embodiment, the outer ring sleeve 12 and the ring plate 13 are made of insulating plastic and are integrally molded.

[0034] Specifically, the connection of the conductive ring 11 to the electromagnetic coil 213 when it is in power supply mode is as follows: positive and negative terminals are provided at both ends of the electromagnetic coil 213. Current is input at the positive terminal and output at the negative terminal. A main conductive terminal 214 and a secondary conductive terminal 215 are respectively provided at the positive terminal, and the secondary conductive terminal 215 is attached to an external conductive terminal 216. One of the main conductive terminal 214 or the secondary conductive terminal 215 is in contact with the conductive ring 11, which can form a positive input of current in different placement directions. Similarly, at the negative terminal, a main conductive terminal 214 and a secondary conductive terminal 215 are attached to the negative terminal, and the secondary conductive terminal 215 is attached to an external conductive terminal 216. When the negative terminal outputs, since the main conductive terminal 214 or the external conductive terminal 216 is in contact with another main conductive terminal 214 or the external conductive terminal 216 in the same column, the current can be smoothly introduced into the current output terminal of the next magnetic block 21 in the same column, thereby maintaining the current supply of the electromagnetic coil 213.

[0035] In this embodiment, to accommodate different directions and the arrangement rules of the Hellbeck magnetic array, the magnetic blocks 21 include four types: first magnetic block a, second magnetic block b, third magnetic block c, and fourth magnetic block d. The current-carrying direction of the first magnetic block a is opposite to that of the third magnetic block c, the current-carrying direction of the second magnetic block b is opposite to that of the fourth magnetic block d, the current-carrying directions of the first magnetic block a and the second magnetic block b are perpendicular to each other, and the current-carrying directions of the third magnetic block c and the fourth magnetic block d are perpendicular to each other. During arrangement, they are arranged in the order of first magnetic block a, second magnetic block b, third magnetic block c, and fourth magnetic block d. When fully energized, the current directions of the first magnetic block a, second magnetic block b, third magnetic block c, and fourth magnetic block d are all different, and this order is repeated in subsequent arrangements. Furthermore, each group of magnetic blocks is arranged in the same column. For example, the same column containing first magnetic blocks a contains all first magnetic blocks a, the same column containing second magnetic blocks b contains all second magnetic blocks b, and so on.

[0036] It should be emphasized that the currents between the first magnetic block a, the second magnetic block b, the third magnetic block c, and the fourth magnetic block d are not interconnected. The currents of the first magnetic block a in the same column can be interconnected by connecting the two ends. The currents of the other magnetic block groups pass through in the same way.

[0037] Since the installation requires arrangement according to the Hellbeck magnetic array, and not all processors may understand this, in order to effectively avoid errors during the installation process and further reduce the scrap rate, the negative end of the inner shell 212 is set as an arc-shaped structure according to the different positive and negative poles of the internal electromagnetic coil 213 after the inner shell 212 is inserted, and a convex ring 219 is set on the outer ring surface of the positive end. The convex ring 219 is made of rubber material. At the same time, an arc-shaped groove corresponding to the convex ring 219 is set on the positive end of the outer shell 211. When the inner shell 212 is completely embedded in the outer shell 211, the convex ring 219 can be embedded in the arc-shaped groove to form a unidirectional fixation.

[0038] Furthermore, the opening diameter of the negative terminal of the outer shell 211 is smaller than that of the inner shell 212. Therefore, the inner shell 212 is blocked at the negative terminal after being fully inserted and cannot slide out from the negative terminal of the outer shell 211, but its negative terminal can be exposed. In this embodiment, the inside of the negative terminal of the outer shell 211 is arc-shaped with a diameter decreasing from large to small, and the shape of the inner shell 212 corresponding to the shape of the inner constraint part of the outer shell 211 is also arc-shaped. This allows the inner shell 212 to be fully inserted into the outer shell 211, allowing the main conductive terminal 214 of the negative terminal to protrude.

[0039] Specifically, the first magnetic block a, the second magnetic block b, the third magnetic block c, and the fourth magnetic block d are installed as follows: In the first magnetic block a, the first outer shell 211a is inserted into the outer ring 12 from the axis toward the edge, and the first main conductive terminal 214a at the output end is in contact with the inner surface of the outer ring 12. In the third magnetic block c, the third outer shell 211c is inserted into the outer ring 12 from the edge toward the axis, and the third main conductive terminal 214c at the input end is in contact with the inner surface of the outer ring 12. In the second magnetic block b, the second outer shell 211b is inserted into the outer ring 212b from the first magnetic block a toward the third magnetic block c, and the second main conductive terminal 214b at the input end is in contact with the first outer shell 211a of the first magnetic block a. The fourth outer shell 211d of the fourth magnetic block d is inserted into the fourth inner shell 212d from the direction of the third magnetic block c toward the second magnetic block b, and the fourth main conductive terminal 214d of the output end is attached to the third outer shell 211c of the third magnetic block c.

[0040] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the invention by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the invention should be included within the scope of protection of the invention.

Claims

1. A Helbeck magnetic array ring without permanent magnets, characterized in that, include: Back yoke (1), with a conductive ring (11) fixed at the bottom of the back yoke (1); Several superimposed magnetic rings (2) are embedded inside the back yoke (1). Each magnetic ring (2) is composed of several magnetic blocks (21), and the adjacent sides of two magnetic blocks (21) are fixed together. The magnetic blocks (21) include four types: first magnetic block (a), second magnetic block (b), third magnetic block (c), and fourth magnetic block (d). The current-carrying direction of the first magnetic block (a) is opposite to that of the third magnetic block (c), the current-carrying direction of the second magnetic block (b) is opposite to that of the fourth magnetic block (d), the current-carrying directions of the first magnetic block (a) and the second magnetic block (b) are perpendicular to each other, and the current-carrying directions of the third magnetic block (c) and the fourth magnetic block (d) are perpendicular to each other. The magnetic block (21) includes an outer shell (211) with a through hole in the middle and an inner shell (212) slidably installed in the through hole of the outer shell (211). An electromagnetic coil (213) is embedded inside the inner shell (212). A set of symmetrical main conductive terminals (214) are embedded at both ends of the inner shell (212). A set of symmetrical secondary conductive terminals (215) are embedded on the annular surface of the inner shell (212). The two ends of the electromagnetic coil (213) are electrically connected to the two main conductive terminals (214), and the two main conductive terminals (214) are electrically connected to the two secondary conductive terminals (215). An outer conductive terminal (216) is embedded on the side of the outer shell (211), and the outer conductive terminal (216) is in contact with the secondary conductive terminal (215).

2. The Halbec magnetic array ring without permanent magnets according to claim 1, characterized in that, The back yoke (1) also includes an outer ring sleeve (12), and a ring plate (13) is fixedly installed on the inner ring side of the outer ring sleeve (12). The conductive ring (11) is embedded in the ring plate (13) and the conductive ring (11) is in contact with the outer conductive terminal (216).

3. A Helbeck magnetic array ring without permanent magnets according to claim 2, characterized in that, The first outer shell (211a) in the first magnetic block (a) is inserted into the first inner shell (212a) from the axis of the outer ring (12) toward the edge, and the first main conductive terminal (214a) of the output end is attached to the inner side of the outer ring (12).

4. A Helbeck magnetic array ring without permanent magnets according to claim 2, characterized in that, The third outer shell (211c) in the third magnetic block (c) is inserted into the third inner shell (212c) from the edge of the outer ring (12) toward the axis, and the third main conductive terminal (214c) at the input end is attached to the inner side of the outer ring (12).

5. A Helbeck magnetic array ring without permanent magnets according to claim 3, characterized in that, The second outer shell (211b) of the second magnetic block (b) is inserted into the second inner shell (212b) from the first magnetic block (a) toward the third magnetic block (c), and the second main conductive terminal (214b) of the input end is attached to the first outer shell (211a) of the first magnetic block (a).

6. A Helbeck magnetic array ring without permanent magnets according to claim 4, characterized in that, The fourth outer shell (211d) of the fourth magnetic block (d) is inserted into the fourth inner shell (212d) from the third magnetic block (c) toward the second magnetic block (b), and the fourth main conductive terminal (214d) of the output end is attached to the third outer shell (211c) of the third magnetic block (c).

7. A Helbeck magnetic array ring without permanent magnets according to claim 1, characterized in that, The inner ring of the electromagnetic coil (213) is coated with an insulating coating (217).

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