Voice coil and winding method

Abstract

The invention discloses a voice coil and a winding method. The voice coil comprises a framework and a voice coil winding, the voice coil winding is used as a core component for realizing a voice coil electromagnetic conversion function and is tightly wound on the peripheral wall of the framework; the framework comprises spiral grooves which are spirally distributed on the peripheral wall of the framework and spiral convex surfaces which are formed between the adjacent spiral grooves, and the spiral convex surfaces are used for providing winding support and positioning for the voice coil winding; the spiral grooves in the surface of the framework cooperate with the heat conduction assembly in the framework, a double system of radial heat dissipation and axial heat conduction is constructed, firstly, the heat dissipation area of the outer surface of the framework is increased through the spiral grooves, and through the heat conduction assembly on the inner wall of the framework, the heat dissipation area of the outer surface of the framework is increased. The annular heat conduction piece is precisely matched with the flange heat dissipation holes, heat of the winding close to the inner side of the framework is led out, and the problem that heat on the side, close to the framework, of the winding is difficult to dissipate and accumulate due to passive heat dissipation of a traditional voice coil only depending on the outer surface is solved.

Description

Technical Field

[0001] This invention relates primarily to the field of electroacoustic product technology, specifically to a voice coil and its winding method. Background Technology

[0002] Electroacoustic products are a class of electronic devices designed and manufactured based on the principle of electro-acoustic energy conversion. Their core function is to realize bidirectional or unidirectional conversion between electrical signals and sound wave signals to meet the needs of sound pickup, amplification, reproduction, transmission or processing. Common examples include electroacoustic transducers (speakers, microphones), audio amplifiers, headphones, audio systems, sonar equipment, hearing aids, etc.

[0003] In the core transducer components of electroacoustic products, the voice coil is the core actuator for realizing the electro-electric conversion and a key structure that determines the transducer efficiency and sound quality. The voice coil is usually formed by winding enameled wire on a frame and suspended in a stable magnetic field constructed by a permanent magnet. When an audio electrical signal is passed into the voice coil winding, according to Ampere's law, the voice coil will generate mechanical vibration in the magnetic field that is consistent with the frequency of the electrical signal. This vibration is transmitted through the frame to the diaphragm connected to it, and finally pushes the air to form a sound wave. In existing technologies, voice coils generally use enameled wire wound around the outer periphery of the frame. However, traditional voice coil frames rely solely on the outer surface for passive heat dissipation, with the winding tightly wound around the frame surface. This makes it difficult for heat from the side of the winding near the frame to penetrate the frame substrate and dissipate outwards, easily leading to heat accumulation, reducing the voice coil's operational stability, and even shortening its lifespan. At the same time, the winding leads are often directly attached to the frame surface or fixed with single-point adhesive, which only constrains the leads at fixed points. Most of the remaining sections are in a suspended state without support. When the voice coil is installed horizontally, the suspended leads are prone to sag or shift due to their own weight or assembly operations, which can interfere with surrounding components and affect connection reliability. Summary of the Invention

[0004] The present invention addresses the problem of overly simplistic solutions in existing technologies by providing a voice coil and a winding method. This solution addresses the issue raised in the background section where traditional voice coil frames rely solely on their outer surface for passive heat dissipation, with the windings tightly wound around the frame surface. This results in heat accumulation on the side of the windings closest to the frame, making it difficult for heat to penetrate the frame substrate and dissipate outwards.

[0005] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows: A voice coil, comprising a frame and voice coil windings.

[0006] The voice coil winding, as the core component for realizing the electromagnetic conversion function of the voice coil, is tightly wound around the outer peripheral wall of the frame.

[0007] The skeleton includes spiral grooves distributed in a spiral shape on its outer peripheral wall, and spiral convex surfaces formed between adjacent spiral grooves. The spiral convex surfaces are used to provide winding support and positioning for the voice coil winding; the spiral grooves are used to increase the heat dissipation area of ​​the outer surface of the skeleton.

[0008] A top flange and a bottom flange are fixedly connected to the top and bottom of the frame, respectively. A heat-conducting component is installed inside the frame. The heat-conducting component is integrated with the top flange and the bottom flange to receive the heat conducted by the voice coil winding through the frame and transfer it to the heat dissipation holes opened on the top flange and the bottom flange. The heat-conducting component, together with the spiral groove, forms a heat dissipation channel that runs through the top and bottom through the heat conduction.

[0009] Furthermore, the skeleton is a regular cylindrical shape with a maximum outer diameter of 8-30mm and an axial length of 10-50mm. Its interior is hollow and runs vertically through the interior. The spiral grooves on the outer peripheral wall of the skeleton have a pitch of 1-3mm, a groove width of 0.5-1.5mm, and a depth of 0.3-0.8mm, and the width of the spiral convex surface is greater than the groove width of the spiral groove.

[0010] Furthermore, the heat-conducting component includes a plurality of heat-conducting ribs extending axially along the inner wall of the skeleton, and an annular heat-conducting element integrally integrated with each heat-conducting rib, wherein the heat-conducting ring is fixed to the side of the corresponding top flange and bottom flange close to the skeleton.

[0011] Furthermore, the top flange and the bottom flange are annular structures, with the outer diameter of the flanges being 2-4 mm larger than the maximum outer diameter of the skeleton, and the axial length of the flanges being 3-5 mm. The surface of the flanges is uniformly distributed with 4-6 through-type heat dissipation holes arranged in an annular array along the axis.

[0012] Furthermore, the annular heat-conducting component corresponds to each of the heat dissipation holes on the top flange and the bottom flange, and the radial specification of the annular heat-conducting component is adapted to the diameter of the heat dissipation holes.

[0013] Furthermore, a radially extending V-shaped lead wire groove is provided on one side of the top flange body, with the groove opening facing the outside of the flange and the groove bottom facing the inside of the flange.

[0014] Furthermore, a fixing block is embedded in the lead groove. The shape of the fixing block matches the groove shape of the lead groove. The fixing block has a groove extending vertically along its inner side near the bottom of the groove. The cross-section of the groove is arc-shaped, and the width of the groove is adapted to the diameter of the lead wire of the voice coil winding.

[0015] A method for winding the above-mentioned voice coil, the method specifically includes the following steps: S1. Fix the skeleton according to the assembly requirements, preset the winding parameters based on the spiral groove of the outer peripheral wall of the skeleton, temporarily seal the spiral groove, select 0.08-0.2mm enameled wire, clean it and set it aside for later use. S2. Embed the starting end of the enameled wire into the lead groove, and fix the starting end lead wire with the fixing block and high temperature resistant tape to determine the forward and reverse winding direction of the equipment winding spindle. S3. Wind the bottom layer winding in the forward direction along the spiral convex surface of the skeleton according to the preset parameters, and simultaneously coat it with high-temperature resistant epoxy insulating adhesive. S4. Spray high-temperature resistant epoxy insulating adhesive onto the bottom winding and cure it to a semi-cured state. S5. Switch to the direction of the upper winding to reverse along the spiral convex surface, and repeat the forward and reverse winding until the preset total number of winding layers is reached. S6. Fix the end of the enameled wire and the lead wire, and achieve double reinforcement fixation by fixing block and high temperature resistant conductive adhesive and tape; S7. Remove the temporary sealing structure of the spiral groove.

[0016] Furthermore, S1-1, select the vertical or horizontal arrangement of the skeleton according to the assembly requirements, and fix the skeleton coaxially to the main shaft of the winding machine using a clamp to ensure that there is no radial offset during the rotation of the skeleton. S1-2. Based on the helical angle of the spiral groove and the pitch of 1-3mm, calculate the matching ratio between the rotational angular velocity of the winding machine spindle and the axial feed speed of the wire conveying mechanism, where feed speed = pitch × spindle speed. This linkage parameter is preset in the equipment program to ensure that the winding trajectory of the enameled wire matches the spiral direction of the spiral convex surface. S1-3. Based on the depth of the spiral groove, preset the total number of winding layers: according to the wire diameter of the enameled wire × the total number of winding layers ≤ the depth of the spiral groove, and reserve 0.05-0.1mm of space for the insulating adhesive coating to ensure that the total thickness after multi-layer winding does not exceed the groove plane. S1-4. Temporary sealing of spiral grooves using high-temperature resistant peelable tape: Cut the tape into strips that fit the length of the groove along its extension direction. Only attach the two sides of the tape to the top of the two sides of the spiral groove wall. The middle area of ​​the tape should completely cover the groove opening and not contact the surface of the spiral convex surface, ensuring that the spiral convex surface remains flat and unobstructed. The sealing tapes of adjacent grooves should not overlap, and the distance between the edge of the tape and the spiral convex surface should be controlled at 0.1-0.2mm to avoid the tape adhering to the spiral convex surface. S1-5. Select enameled wire with a diameter of 0.08-0.2mm, clean it with anhydrous ethanol to remove surface impurities, and then set it aside for use.

[0017] Furthermore, in step S2: from the perspective of the skeleton axis, the winding spindle of the equipment rotates clockwise for forward winding and counterclockwise for reverse winding; one end of the enameled wire is embedded into the V-shaped lead groove by the lead wire clamping mechanism of the equipment, and a fixing block that matches the groove shape is inserted for temporary sealing. Then, a 2-3mm wide high-temperature resistant tape is wrapped around the flange position of the corresponding area of ​​the fixing block to initially fix the fixing block and the starting section of the lead wire. In step S3: the main shaft of the equipment rotates at a constant speed, the wire feeding mechanism feeds synchronously according to the preset linkage parameters, and at the same time controls the wire tension of the winding machine at 0.5-1.5N to ensure that the enameled wire is tightly attached to the spiral convex surface without loose bulging; the glue coating module evenly coats a thin layer of high temperature resistant epoxy insulating glue at the contact point between the enameled wire and the spiral convex surface. When the winding reaches the end of the spiral convex surface at the other end of the skeleton, the bottom layer winding is completed. In step S6: Turn off the device wrapping power, tear off the high-temperature resistant tape wrapped in step S2, take out the fixing block, and pull the extended ends of the enameled wire to the lead slot to ensure that the two leads are discharged in parallel in the slot; re-embed the fixing block into the lead slot, apply high-temperature resistant conductive adhesive to the gap between the fixing block and the lead slot and the contact area between the lead and the slot wall, and then wrap 2-3 layers of tape along the edge of the top flange to achieve double reinforcement and fixation of the fixing block and the two leads.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. In this invention, a dual system of radial heat dissipation and axial heat conduction is constructed through the synergy of spiral grooves on the skeleton surface and internal heat-conducting components. First, the spiral grooves increase the heat dissipation area on the outer surface of the skeleton. Second, relying on the heat-conducting components on the inner wall of the skeleton, the heat of the winding close to the inner side of the skeleton is dissipated. This solves the problem that traditional voice coils can only rely on the outer surface for passive heat dissipation, which leads to the accumulation of heat on the side of the winding close to the skeleton. At the same time, the skeleton is made of carbon nanotube modified polyimide composite material, and the flange is made of polyimide or glass fiber reinforced epoxy resin. While ensuring efficient heat conduction, it achieves dual insulation protection between the winding and the heat-conducting components, and between the voice coil and external components, taking into account both heat dissipation performance and electrical safety.

[0019] 2. In this invention, the top flange, bottom flange, and heat-conducting component of the voice coil are integrated into one piece. The annular heat-conducting component is precisely matched with the heat dissipation holes of the flange, which not only ensures the smoothness of the heat transfer path but also strengthens the overall structural support strength of the voice coil. The V-shaped lead groove of the top flange, together with the arc-shaped lead groove fixing block, expands the support and constraint area of ​​the lead wire, replacing the traditional single-point adhesive fixing method, reducing the length of the lead wire suspension, and avoiding the problem of lead wire sagging and offset when the voice coil is installed horizontally.

[0020] 3. Meanwhile, this voice coil winding method achieves the fit between the winding and the spiral convex surface through operations such as preset winding helix angle, temporary sealing of spiral grooves, and layered adhesive curing. This ensures that the outer circle of the winding does not exceed the groove plane, avoiding problems such as wire offset and stacking during the winding process. At the same time, the use of forward and reverse layered winding and semi-cured insulating adhesive spraying process enhances the interlayer insulation performance and reduces interlayer friction loss of the winding. The double fixing process at the lead end further reduces the risk of stress concentration in the lead during high-frequency operation of the voice coil.

[0021] The present invention will be explained in detail below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the top structure of the present invention; Figure 2 This is a schematic diagram of the bottom structure of the present invention; Figure 3 This is a front view structural diagram of the present invention; Figure 4 This is a schematic diagram of the skeleton structure of the present invention; Figure 5 This is a schematic diagram of the thermal conductive component structure of the present invention; Figure 6 For the present invention Figure 5 Enlarged schematic diagram of the structure at point A in the middle.

[0023] Numbering on the map: 1. Skeleton; 11. Spiral groove; 12. Spiral convex surface; 2. Voice coil winding; 3. Top flange; 31. Lead groove; 32. Fixing insert; 4. Bottom flange; 5. Heat-conducting component; 51. Heat-conducting rib; 52. Annular heat-conducting component. Detailed Implementation

[0024] To facilitate understanding of the present invention, a more comprehensive description of the present invention will be given below with reference to the accompanying drawings, which illustrate several embodiments of the present invention. However, the present invention can be implemented in different forms and is not limited to the embodiments described in the text. Rather, these embodiments are provided to make the disclosure of the present invention more thorough and complete.

[0025] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0026] Please refer to the appendix carefully. Figure 1-6A voice coil, comprising a frame 1 and a voice coil winding 2.

[0027] The voice coil winding 2, as the core component for realizing the electromagnetic conversion function of the voice coil, is tightly wound around the outer peripheral wall of the frame 1.

[0028] The frame 1 includes spiral grooves 11 distributed in a spiral shape on its outer peripheral wall, and spiral convex surfaces 12 formed between adjacent spiral grooves 11. The spiral convex surfaces 12 are used to provide winding support and positioning for the voice coil winding 2. The spiral grooves 11 are used to increase the heat dissipation area of ​​the outer surface of the frame 1.

[0029] A top flange 3 and a bottom flange 4 are fixedly connected to the top and bottom of the frame 1, respectively. A heat-conducting component 5 is provided inside the frame 1. The heat-conducting component 5 is integrated with the top flange 3 and the bottom flange 4. It is used to receive the heat conducted by the voice coil winding 2 through the frame 1 and transfer it to the heat dissipation holes opened on the top flange 3 and the bottom flange 4. The heat-conducting component 5, together with the spiral groove 11, forms a heat dissipation channel that runs through the top and bottom through the heat conduction.

[0030] In this embodiment, as Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the skeleton 1 is a regular cylindrical shape with a maximum outer diameter of 8-30mm and an axial length of 10-50mm. Its interior is hollow and has a through-hole shape. The spiral groove 11 on the outer peripheral wall of the skeleton 1 has a pitch of 1-3mm, a groove width of 0.5-1.5mm, and a depth of 0.3-0.8mm. The width of the spiral convex surface 12 is greater than the groove width of the spiral groove 11.

[0031] With the above structure, the skeleton 1 adopts carbon nanotube modified polyimide composite material in the disclosed technology. This material uses polyimide as the matrix and adds 1%-5% carbon nanotubes as thermally conductive filler. This can not only ensure reliable insulation between the voice coil winding 2 and the thermally conductive component 5, but also form a thermally conductive path, allowing the heat of the voice coil winding 2 to be transferred to the inner wall through the surface of the skeleton 1. The formation of the spiral groove 11 increases the heat dissipation area of ​​the outer surface of the skeleton 1.

[0032] In this embodiment, as Figure 4 and Figure 5 As shown, the heat-conducting component 5 includes a plurality of heat-conducting ribs 51 extending axially along the inner wall of the frame 1, and an annular heat-conducting element 52 integrally integrated with each heat-conducting rib 51. The annular heat-conducting element 52 is fixed to the side of the corresponding top flange 3 and bottom flange 4 near the frame 1.

[0033] With the above structure, the traditional voice coil frame 1 relies solely on natural heat dissipation from its outer surface, making it difficult for heat from the inner part of the winding, which is in close contact with the frame 1, to penetrate the frame 1 substrate and dissipate outwards, easily causing heat accumulation. The heat-conducting component 5 is made of copper alloy or aluminum alloy. First, its heat-conducting ribs 51 are fully attached to the inner wall of the frame 1 to form an axial heat-conducting path, receiving the heat from the voice coil winding 2 transferred by the frame 1, and transferring it out through the annular heat-conducting components 52 at both ends. Combined with the spiral grooves 11 on the outside of the frame 1 used to increase the heat dissipation area of ​​the outer surface, a synergistic effect of radial heat dissipation and axial heat conduction is achieved.

[0034] In this embodiment, as Figure 4 and Figure 5 As shown, the top flange 3 and the bottom flange 4 are annular structures. The outer diameter of the flanges is 2-4 mm larger than the maximum outer diameter of the skeleton 1, and the axial length of the flanges is 3-5 mm. The surface of the flanges is evenly distributed with 4-6 through-type heat dissipation holes arranged in an annular array along the axis.

[0035] The annular heat-conducting element 52 corresponds to each heat dissipation hole on the top flange 3 and the bottom flange 4, and the radial specification of the annular heat-conducting element 52 is adapted to the diameter of the heat dissipation hole.

[0036] Through the above structure, the top flange 3 and the bottom flange 4 are made of polyimide or glass fiber reinforced epoxy resin, which has insulation properties and ensures the support strength of the overall voice coil structure. The through-hole heat dissipation holes formed on their surfaces correspond to the annular heat conductor 52, which can dissipate the heat transferred by the heat conductor 5. At the same time, their insulating material can prevent short circuits with external components, which is something that the traditional voice coil skeleton 1 cannot achieve by relying solely on passive heat dissipation from the outer surface.

[0037] In this embodiment, as Figure 5 and Figure 6 As shown, a V-shaped lead wire groove 31 extending radially is provided on one side of the main body of the top flange 3. The opening of the lead wire groove 31 faces the outside of the flange and the bottom of the groove faces the inside of the flange.

[0038] The lead wire groove 31 is embedded with a fixing block 32. The shape of the fixing block 32 matches the groove shape of the lead wire groove 31. The fixing block 32 has a wire groove that runs through its vertical height on the inner side near the bottom of the groove. The cross-section of the wire groove is arc-shaped, and the width of the wire groove is adapted to the wire diameter of the lead wire of the voice coil winding 2.

[0039] With the above structure, the leads of traditional windings are mostly directly attached to the surface of the frame 1 in a symmetrical manner and then bonded. This only constrains the leads at fixed points, while most of them are in a suspended state without support. Since the voice coil is subsequently installed horizontally, the excessive suspended parts of the leads may shift or sag. However, by adding lead slots 31 and matching fixing blocks 32, the support and constraint area of ​​the leads is expanded. When the voice coil is installed, the leads can be laid along the path of the lead slot 31 opening and bend smoothly with the help of the slot structure, directly connecting with external components. This minimizes the suspended length of the leads and improves the reliability of the lead connection.

[0040] A method for winding a voice coil specifically includes the following steps: S1. Fix the frame 1 according to the assembly requirements. Based on the preset winding parameters of the spiral groove 11 on the outer peripheral wall of the frame 1, temporarily seal the spiral groove 11. Select 0.08-0.2mm enameled wire, clean it and set it aside for later use.

[0041] S1-1. Select the vertical or horizontal arrangement of the skeleton 1 according to the assembly requirements. Fix the skeleton 1 coaxially to the main shaft of the winding machine using a clamp to ensure that there is no radial offset during the rotation of the skeleton 1.

[0042] S1-2. Based on the helical angle of the helical groove 11 and the pitch of 1-3mm, calculate the matching ratio between the rotational angular velocity of the winding machine spindle and the axial feed speed of the wire conveying mechanism, where the feed speed = pitch × spindle speed. This linkage parameter is preset in the equipment program to ensure that the winding trajectory of the enameled wire matches the helical direction of the helical convex surface 12.

[0043] S1-3. Based on the depth of the spiral groove 11, preset the total number of winding layers: according to the wire diameter of the enameled wire × the total number of winding layers ≤ the depth of the spiral groove, and reserve 0.05-0.1mm of space for the insulating adhesive coating to ensure that the total thickness after multi-layer winding does not exceed the groove plane.

[0044] S1-4. Temporary sealing of the spiral groove 11 using high-temperature resistant peelable tape: Cut the tape into strips that fit the length of the groove along the extension direction of the spiral groove 11. Only attach the two sides of the tape to the top of the two sides of the groove wall of the spiral groove 11. The middle area of ​​the tape completely covers the groove opening and does not contact the surface of the spiral convex surface 12, ensuring that the spiral convex surface 12 remains flat and unobstructed. The sealing tapes of adjacent grooves do not overlap. The distance between the edge of the tape and the spiral convex surface 12 is controlled at 0.1-0.2mm to avoid the tape adhering to the spiral convex surface 12.

[0045] S1-5. Select enameled wire with a diameter of 0.08-0.2mm, clean it with anhydrous ethanol to remove surface impurities, and then set it aside for use.

[0046] S2. From the perspective of the axis of skeleton 1, the winding spindle of the equipment rotates clockwise for forward winding and counterclockwise for reverse winding. The enameled wire is inserted into the V-shaped lead groove 31 by the lead wire clamping mechanism of the equipment. The fixing block 32 that matches the groove shape of the lead groove 31 is inserted for temporary sealing. Then, 2-3mm wide high-temperature resistant tape is wrapped around the flange position of the corresponding area of ​​the fixing block 32 to initially fix the fixing block 32 and the starting section of the lead wire.

[0047] S3. The main shaft of the equipment rotates at a constant speed, and the wire feeding mechanism feeds synchronously according to the preset linkage parameters. At the same time, the wire tension of the winding machine is controlled at 0.5-1.5N to ensure that the enameled wire is tightly attached to the spiral convex surface 12 without loose bulging. The glue coating module evenly coats a thin layer of high-temperature resistant epoxy insulating glue at the contact point between the enameled wire and the spiral convex surface 12. When the winding reaches the end of the spiral convex surface 12 at the other end of the skeleton 1, the bottom layer winding is completed.

[0048] S4. Spray a layer of high-temperature resistant epoxy insulating adhesive evenly onto the winding surface, covering the entire winding area, and cure it with a hot air assembly to make the insulating adhesive semi-cured.

[0049] S5. The equipment rotation direction is switched to reverse. Repeat the gluing and winding process of S3. The wire conveying mechanism feeds synchronously along the reverse spiral trajectory of the spiral convex surface 12. The enameled wire is spirally wound in the reverse direction from the other end of the skeleton 1 to the starting end along the semi-cured bottom insulating adhesive surface to ensure that the upper winding trajectory is closely attached to the bottom winding. Repeat the gluing and heating curing steps of S4. Repeat the forward spiral winding and reverse spiral winding until the preset total number of winding layers is reached.

[0050] S6. When winding the last layer of the coil to the end of the spiral convex surface 12 at the end of the bobbin 1, turn off the equipment winding power, tear off the adhesive tape in the area of ​​the fixed insert 32 in step S2, take out the fixed insert 32, pull the end of the enameled wire to the lead groove 31, and ensure that the two leads are discharged in parallel in the groove. Then, re-embed the fixed insert 32 into the lead groove 31, apply high temperature resistant conductive adhesive to the gap between the fixed insert 32 and the lead groove 31, and to the contact area between the lead and the groove wall to strengthen the fixing effect. Then, wrap 2-3 layers of tape along the edge of the top flange 3 to achieve double reinforcement fixing of the fixed insert 32 and the two leads.

[0051] S7. Remove the high-temperature resistant peelable protective film that adhered to the surface of the spiral groove 11 in step S1.

[0052] The present invention has been described by way of example in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvement made by adopting the inventive concept and technical solution of the present invention, or the direct application of the inventive concept and technical solution of the present invention to other occasions without modification, shall be within the protection scope of the present invention.

Claims

1. A voice coil, characterized in that: Includes a frame (1) and a voice coil winding (2); The voice coil winding (2) is the core component for realizing the electromagnetic conversion function of the voice coil, and is tightly wound around the outer wall of the skeleton (1); The skeleton (1) includes spiral grooves (11) distributed in a spiral shape on its outer peripheral wall, and spiral convex surfaces (12) formed between adjacent spiral grooves (11), wherein the spiral convex surfaces (12) are used to provide winding support and positioning for the voice coil winding (2); the spiral grooves (11) are used to increase the heat dissipation area of ​​the outer surface of the skeleton (1); A top flange (3) and a bottom flange (4) are fixedly connected to the top and bottom of the frame (1), respectively. A heat-conducting component (5) is provided inside the frame (1). The heat-conducting component (5) is integrated with the top flange (3) and the bottom flange (4) to receive the heat conducted by the voice coil winding (2) through the frame (1) and transfer it to the heat dissipation holes opened on the top flange (3) and the bottom flange (4). The heat-conducting component (5) works with the spiral groove (11) through heat conduction to form a heat dissipation channel that runs through the top and bottom.

2. A voice coil according to claim 1, characterized in that: The skeleton (1) is a regular cylindrical shape with a maximum outer diameter of 8-30mm and an axial length of 10-50mm. Its interior is hollow and has a through-hole shape. The spiral groove (11) on the outer peripheral wall of the skeleton (1) has a pitch of 1-3mm, a groove width of 0.5-1.5mm, a depth of 0.3-0.8mm, and a spiral angle of 5°-30°. The width of the spiral convex surface (12) is greater than the groove width of the spiral groove (11).

3. A voice coil according to claim 1, characterized in that: The heat-conducting component (5) includes a plurality of heat-conducting ribs (51) extending axially along the inner wall of the skeleton (1), and an annular heat-conducting element (52) integrally integrated with each heat-conducting rib (51) on the upper and lower sides. The annular heat-conducting element (52) is fixed to the side of the corresponding top flange (3) and bottom flange (4) close to the skeleton (1).

4. A voice coil according to claim 1, characterized in that: The top flange (3) and bottom flange (4) are annular structures. The outer diameter of the flanges is 2-4 mm larger than the maximum outer diameter of the skeleton (1), and the axial length of the flanges is 3-5 mm. The surface of the flanges is evenly distributed with 4-6 through-type heat dissipation holes arranged in an annular array along the axis.

5. A voice coil according to claim 3, characterized in that: The annular heat-conducting element (52) corresponds to each of the heat dissipation holes on the top flange (3) and the bottom flange (4), and the radial specification of the annular heat-conducting element (52) is adapted to the diameter of the heat dissipation hole.

6. A voice coil according to claim 1, characterized in that: A V-shaped lead wire groove (31) extending radially is provided on one side of the main body of the top flange (3). The opening of the lead wire groove (31) faces the outside of the flange and the bottom of the groove faces the inside of the flange.

7. A voice coil according to claim 6, characterized in that: The lead groove (31) is embedded with a fixing block (32). The shape of the fixing block (32) matches the groove shape of the lead groove (31). The fixing block (32) has a groove extending vertically through its inner side near the bottom of the groove. The cross-section of the groove is arc-shaped, and the width of the groove is adapted to the diameter of the lead wire of the voice coil winding (2).

8. A method for winding a voice coil as described in any one of claims 1-7, characterized in that, Includes the following steps: S1. Fix the skeleton (1) according to the assembly requirements. Based on the preset winding parameters of the spiral groove (11) on the outer peripheral wall of the skeleton (1), temporarily seal the spiral groove (11), select 0.08-0.2mm enameled wire, and keep it for later use after cleaning. S2. Embed the starting end of the enameled wire into the lead groove (31), fix the starting end lead wire with the fixing block (32) and high temperature resistant tape, and clarify the forward and reverse winding direction of the equipment winding spindle; S3. According to the preset parameters, wind the bottom layer winding in the forward direction along the spiral convex surface (12) of the skeleton (1), and simultaneously coat it with high temperature resistant epoxy insulating adhesive. S4. Spray high-temperature resistant epoxy insulating adhesive onto the bottom winding and cure it to a semi-cured state. S5. Switch to the direction along the spiral convex surface (12) to wind the upper layer winding in the opposite direction. Repeat the forward and reverse winding until the preset total number of winding layers is reached. S6. Fix the end of the enameled wire and the lead wire, and achieve double reinforcement fixation by fixing the insert (32) and the high temperature conductive adhesive and tape; S7. Remove the temporary sealing structure of the spiral groove (11).

9. The method for winding a voice coil according to claim 8, characterized in that, The specific operations of step S1 also include: S1-1. Select the vertical or horizontal arrangement of the skeleton (1) according to the assembly requirements, and fix the skeleton (1) coaxially to the main shaft of the winding machine through the clamp to ensure that there is no radial offset during the rotation of the skeleton (1). S1-2. Based on the helical angle of the helical groove (11) and the pitch of 1-3mm, calculate the matching ratio between the rotational angular velocity of the winding machine spindle and the axial feed speed of the wire conveying mechanism, where the feed speed = pitch × spindle speed. This linkage parameter is preset in the equipment program to ensure that the winding trajectory of the enameled wire matches the helical direction of the helical convex surface (12). S1-3. Based on the depth of the spiral groove (11), the total number of winding layers is preset: according to the wire diameter of the enameled wire × the total number of winding layers ≤ the depth of the spiral groove, and a space of 0.05-0.1mm for the insulating adhesive coating is reserved to ensure that the total thickness after multi-layer winding does not exceed the groove plane. S1-4. Temporary sealing of the spiral groove (11) using high-temperature resistant peelable tape: Cut the tape into strips that fit the length of the groove along the extension direction of the spiral groove (11). Only attach the two sides of the tape to the top of the two sides of the groove wall of the spiral groove (11). The middle area of ​​the tape completely covers the groove opening and does not contact the surface of the spiral convex surface (12), ensuring that the spiral convex surface (12) remains flat and unobstructed. The sealing tapes of adjacent grooves do not overlap. The distance between the edge of the tape and the spiral convex surface (12) is controlled at 0.1-0.2mm to avoid the tape adhering to the spiral convex surface (12). S1-5. Select enameled wire with a diameter of 0.08-0.2mm, clean it with anhydrous ethanol to remove surface impurities, and then set it aside for use.

10. The method for winding a voice coil according to claim 8, characterized in that, The specific operations of steps S2, S3, and S6 also include: In step S2: From the perspective of the axis of the skeleton (1), the winding spindle of the equipment rotates clockwise for forward winding and counterclockwise for reverse winding; the enameled wire is inserted into the V-shaped lead groove (31) by the lead wire clamping mechanism of the equipment, and a fixing block (32) matching the groove shape of the lead groove (31) is inserted for temporary sealing. Then, a 2-3mm wide high-temperature resistant tape is wrapped around the flange position of the corresponding area of ​​the fixing block (32) to initially fix the fixing block (32) and the starting section of the lead wire. In step S3: the main shaft of the equipment rotates at a constant speed, the wire conveying mechanism feeds synchronously according to the preset linkage parameters, and at the same time controls the wire tension of the winding machine at 0.5-1.5N to ensure that the enameled wire is tightly attached to the spiral convex surface (12) without loose bulging; the glue coating module uniformly coats the contact area between the enameled wire and the spiral convex surface (12) with a thin layer of high temperature resistant epoxy insulating glue. When the winding reaches the end of the spiral convex surface (12) at the other end of the skeleton (1), the bottom layer winding is completed. In step S6: turn off the device wrapping power, tear off the high-temperature resistant tape wrapped in step S2, take out the fixing block (32), pull the enameled wire end extension to the lead groove (31) to ensure that the two leads are discharged in parallel in the groove; re-embed the fixing block (32) into the lead groove (31), apply high-temperature resistant conductive adhesive to the gap between the fixing block (32) and the lead groove (31) and the contact point between the lead and the groove wall, and then wrap 2-3 layers of tape along the edge of the top flange (3) to achieve double reinforcement and fixation of the fixing block (32) and the two leads.

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