Electromagnetic induction structure
By employing radially magnetized unipolar magnetic rings or annular magnet arrays in voice coil motors, the problems of low power and short stroke of voice coil motors are solved, achieving more efficient energy conversion.
Patent Information
- Application Number
- CN202520123666.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-20
- Publication Date
- 2025-11-21
- Estimated Expiration
- 2035-01-20
AI Technical Summary
Existing voice coil motors have low power when used as generators and short stroke when used as electric motors, which cannot meet the requirements for efficient energy conversion.
Radially magnetized radial monopole magnetic rings or annular magnet arrays are used as magnet components to provide a radially monopolar magnetic field, making the magnetic field lines perpendicular to the spiral coil conductors, and the relative movement between the magnet components and the spiral coil is achieved through limiting wheels or support structures.
This improved the generator's output power and the motor's travel distance, resulting in more efficient energy conversion.
Smart Images
Figure CN223584017U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of electromagnetic power generation technology, and in particular to electromagnetic induction structures. Background Technology
[0002] Electromagnetic induction occurs when a conductor cuts magnetic field lines or when the magnetic flux of a closed coil changes, generating an induced electromotive force. If this conductor is closed into a loop, an induced current is formed. Conversely, if current is passed through a conductor, the conductor will be displaced in the magnetic field. Figure 1 Figure (a) shows the principle model of a voice coil motor, whose core components consist of a helical coil 1 and an axially magnetized cylindrical magnet 13. A helical coil is a coil formed by winding wire in a spiral pattern. The axially magnetized cylindrical magnet (hereinafter referred to as the magnetic column) has its magnetic poles distributed as N pole at one end and S pole at the other. When the magnetic column is inserted along the coil axis, the coil wire will generate an induced electromotive force. A portion of the coil is cut off, and the magnetic field lines of the magnetic column are drawn; see [reference needed]. Figure 1 In diagram (b), the coil moves along the axial direction of the magnetic column, its trajectory almost parallel to the magnetic field lines of the column. This results in a very weak induced electromotive force generated by the coil wire, making the voice coil motor's power output too low for power generation. When current is applied to the coil, the magnetic column moves along the coil's axial direction. The closer the magnetic field lines are to the magnetic poles, the denser their distribution; the farther away, the sparser. This change in magnetic field density causes stress variations in both the magnetic column and the energized coil, with stress intensity gradually decreasing from the ends of the column to the middle. If the magnetic column is too long, the output power drops sharply when the coil reaches the middle position. To reduce output power fluctuations, voice coil motors must use relatively short magnetic columns; therefore, as electric motors, their stroke is generally short. Thus, it is evident that the voice coil motor's structure is too weak for power generation and too short for electric motor use. Utility Model Content
[0003] To address the shortcomings of existing technologies, this utility model provides an electromagnetic induction structure that can be applied to generators and motors. When applied to generators, the output power is greater than that of voice coil motors; when applied to motors, the stroke is longer than that of voice coil motors.
[0004] To achieve the above objectives, the technical solution adopted in this application is as follows:
[0005] An electromagnetic induction structure includes a magnet assembly and a helical coil. The magnet assembly is coaxially positioned outside or inside the helical coil to provide a radially unipolar magnetic field to the helical coil, and the magnetic field lines are perpendicular to the coil conductors. The magnet assembly and the helical coil move relative to each other.
[0006] The spiral coil can be a straight spiral coil, an arc spiral coil, or a ring spiral coil.
[0007] The magnet assembly is a radially magnetized unipolar magnetic ring.
[0008] The magnet assembly is a ring magnet array consisting of multiple magnets with the same polarity oriented in a ring arrangement of the coil.
[0009] More preferably, the magnets forming the ring-shaped magnet array are square magnets, tile-shaped magnets, or circular magnets.
[0010] The magnet assembly is mounted on the magnet support. The spiral coil has an inner support inside. The fixed bracket fixes both ends of the inner support. The movement of the magnet support relative to the inner support causes the magnet assembly to move relative to the spiral coil.
[0011] The magnet assembly is mounted on the magnet bracket. The spiral coil has an inner coil support inside and a bracket for fixing the coil outside. The inner coil support is sleeved on the magnet bracket. The magnet assembly is located inside the spiral coil. The limiting wheel cooperates with the magnet assembly / magnet bracket to drive the magnet assembly to move, so that the magnet assembly moves relative to the spiral coil.
[0012] The magnet support is a split support, which is composed of multiple support units. The support unit is divided into thick and thin sections. The magnet assembly is installed in the thin section, and the end of the thin section is inserted into the thick section cavity of the adjacent support unit.
[0013] The magnet assembly is mounted on the magnet bracket. The spiral coil has an inner support inside. The limiting wheel cooperates with the inner support to drive the spiral coil and the inner support to move, so that the spiral coil moves relative to the magnet assembly. The spiral coil is provided with a power transmission ring, and a power-taking brush is provided at the power transmission ring.
[0014] The spiral coil is segmented into multiple coil units, and the magnet assembly is a ring magnet array. The number of coil units is the same as the number of ring magnet arrays, and the axial length of the coil units is the same as the axial length of the ring magnet arrays. The coil units are connected by wires. Each ring magnet array is set on a magnet support. Each coil unit has an internal coil support. The coil unit is fixed to the base by a fixed bracket. The magnet support has a notch to avoid the fixed bracket when moving. The magnet support is connected to a central shaft. The central shaft drives the magnet support to move relative to the fixed bracket, thereby causing the magnet assembly to move relative to the spiral coil.
[0015] Depending on the actual needs, the inner support of the coil can be made of a high-permeability material.
[0016] The beneficial effects of this invention are: by using a radially magnetized unipolar magnetic ring or magnets arranged in a ring with the same polarity facing the coil as a magnet assembly, a radially unipolar magnetic field is provided to the helical coil, and the magnetic field lines are perpendicular to the coil conductors. When this electromagnetic induction structure is applied to a generator, its output power is greater than that of a voice coil motor; when applied to an electric motor, it can not only perform linear / arc / circular motion, but also has a longer stroke than that of a voice coil motor. Attached Figure Description
[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0018] Figure 1 It is a schematic diagram of the principle model of a traditional voice coil motor and a schematic diagram of the magnetic field line distribution.
[0019] Figure 2 This is a schematic diagram of the overall structure of the electromagnetic induction structure in Example 1.
[0020] Figure 3 This is a schematic diagram of the electromagnetic induction structure in Example 1.
[0021] Figure 4 This is a schematic diagram of the overall structure of the electromagnetic induction structure in Example 2.
[0022] Figure 5 This is a schematic diagram of the electromagnetic induction structure in Example 2.
[0023] Figure 6 This is a schematic diagram of the overall structure of the electromagnetic induction structure in Example 3.
[0024] Figure 7 This is a schematic diagram of the electromagnetic induction structure in Example 3.
[0025] Figure 8 This is a schematic diagram of the cooperation between the limiting wheel, the spiral coil, and the coil inner support in Example 3.
[0026] Figure 9 This is a schematic diagram of the overall structure of the electromagnetic induction structure in Example 4.
[0027] Figure 10 This is a schematic diagram of the electromagnetic induction structure in Example 4.
[0028] Figure 11 This is a schematic diagram of the cooperation between the limiting wheel, the magnetic ring, and the magnet bracket in Example 4.
[0029] Figure 12This is a schematic diagram of the overall structure of the electromagnetic induction structure in Example 5.
[0030] Figure 13 This is a schematic diagram of the electromagnetic induction structure in Example 5.
[0031] Figure 14 , Figure 15 and Figure 16 This is a schematic diagram of a ring-shaped magnet array.
[0032] Figure 17 This is a schematic diagram illustrating the principle of this utility model.
[0033] In the diagram: 1. Helical coil, 1a. Coil unit, 2. Coil inner support, 3. Fixed bracket, 41. Radial unipolar magnetic ring, 42. Annular magnet array, 5. Magnet bracket, 51. Bracket unit, 511. Coarse section, 512. Fine section, 52. Notch, 6. Base, 7. Linear guide rail, 8. Support, 9. Connecting rod, 10. Limiting wheel, 11. Power transmission ring, 12. Power collection brush, 13. Central shaft, 14. Bracket connecting rod, 15. Fixed sleeve. Detailed Implementation
[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model. Example
[0035] See Figure 2 and Figure 3 The electromagnetic induction structure includes a magnet assembly and a helical coil 1. In this embodiment, the helical coil 1 is a linear helical coil, and the magnet assembly can be, for example, a linear helical coil. Figure 2 and Figure 3 The radially magnetized radial monopole magnetic ring 41 shown is radiatively magnetized. The radial monopole magnetic ring 41 is relatively expensive to manufacture; alternative methods include... Figure 12 , Figure 13 and Figure 14 The annular magnet array 42 shown replaces the radial monopole magnetic ring 41, that is, the magnet assembly is an annular magnet array 42 composed of multiple magnets with the same polarity facing the coil in a ring. Figure 14 , Figure 15 and Figure 16 The annular magnet array 42 is composed of square magnets, tile-shaped magnets, and circular magnets.
[0036] The magnet assembly is mounted on the magnet support 5 and is located outside the spiral coil 1. The spiral coil 1 has an inner coil support 2 inside. A fixing bracket 3 fixes both ends of the inner coil support 2 and is fixed to the base 6. A linear guide rail 7 is provided on the base 6. The magnet support 5 moves along the linear guide rail 7, thereby moving the magnet assembly relative to the spiral coil 1. In this embodiment, the inner coil support 2 can be made of a high-permeability material.
[0037] The electromagnetic induction structure of this embodiment is applied to a generator: After the components are assembled, when the prime mover drives the magnet bracket 5 to move along the linear guide rail 7 on the base 6, the magnetic ring 41 moves linearly relative to the spiral coil 1, and the spiral coil 1 generates an induced current, which can be drawn out from both ends of the coil wire.
[0038] The electromagnetic induction structure of this embodiment is applied to an electric motor: after the components are assembled, when current is passed through the spiral coil 1, the magnet assembly moves linearly along the spiral coil 1. At this time, the electromagnetic induction structure can be used as an electric motor that outputs linear motion.
[0039] The advantages of the electromagnetic induction structure in this embodiment are: compared with the electromagnetic induction structure of a voice coil motor, the electromagnetic induction structure in this embodiment has higher output power when used as a generator, and longer stroke when used as a motor. Example
[0040] See Figure 4 and Figure 5 The electromagnetic induction structure includes a magnet assembly and a helical coil 1. In this embodiment, the helical coil 1 is an arc-shaped helical coil 1. The magnet assembly can be adopted as follows: Figure 4 and Figure 5 The radially magnetized unipolar magnetic ring 41 shown can also be used as... Figure 14 , Figure 15 and Figure 16 The ring-shaped magnet array 42 shown.
[0041] The magnet assembly is mounted on the magnet support 5 and located outside the spiral coil 1. Inside the spiral coil 1, there is a coil inner support 2 that matches the arc-shaped spiral coil 1. A fixing bracket 3 fixes both ends of the coil inner support 2 and is fixed to the base 6. A support 8 is provided on the base 6. One end of the connecting rod 9 is connected to the magnet support 5, and the other end is connected to the support 8. Using the support 8 as a fulcrum, the connecting rod 9 drives the magnet support 5 to move relative to the coil inner support 2, thereby moving the magnet assembly relative to the spiral coil 1. In this embodiment, the coil inner support 2 can be made of a high-permeability material.
[0042] The electromagnetic induction structure of this embodiment is applied to a generator: after the components are assembled, when the prime mover drives the magnet bracket 5 and causes the magnet assembly to move along the coil arc, the coil generates an induced current, which can be led out from both ends of the coil wire.
[0043] The electromagnetic induction structure of this embodiment is applied to an electric motor: after the components are assembled, when current is passed through the coil, the magnet assembly will move along the coil in an arc. At this time, the electromagnetic induction structure can be used as an electric motor that outputs arc motion.
[0044] The advantages of the electromagnetic induction structure in this embodiment are: compared with the electromagnetic induction structure of the voice coil motor, this electromagnetic induction structure has higher output efficiency when used as a generator; and longer stroke when used as a motor. Example
[0045] See Figure 6 , Figure 7 and Figure 8 The electromagnetic induction structure includes a magnet assembly and a helical coil 1. In this embodiment, the helical coil 1 is a ring-shaped helical coil 1, and the magnet assembly can be adopted as follows: Figure 6 and Figure 7 The radially magnetized unipolar magnetic ring 41 shown can also be used as... Figure 14 , Figure 15 and Figure 16 The ring-shaped magnet array 42 shown.
[0046] The magnet assembly is mounted on the magnet bracket 5. An inner coil support 2 is provided inside the spiral coil 1. A limiting wheel 10 cooperates with the inner coil support 2 to drive the spiral coil 1 and the inner coil support 2 to move, causing the spiral coil 1 to move relative to the magnet assembly. A power transmission ring 11 is provided on the spiral coil 1, and a power-collecting brush 12 is provided at the power transmission ring 11. In this embodiment, the inner coil support 2 can be made of a high-permeability magnetic material.
[0047] The electromagnetic induction structure of this embodiment is applied to a generator: Based on the principle that three points determine a plane, this scheme requires at least three limiting wheels 10, and the limiting wheels 10 are concave in an arc shape, which matches the circular outward convexity of the spiral coil 1 and the coil inner support 2, ensuring that the spiral coil 1 rotates stably without displacement in three-dimensional space. At least one of the three limiting wheels 10 is connected to the prime mover as the driving wheel, and the rest are driven wheels. When the prime mover drives the driving wheel to rotate, the driving wheel causes the spiral coil 1 to rotate through friction, and the spiral coil 1 generates an induced current by passing through the magnet assembly. Two transmission rings 11 are fixed to the coil and connected to the two ends of the spiral coil 1 wire, respectively. By contacting the brush 12 with the transmission rings 11, the current generated by the coil can be led out.
[0048] The electromagnetic induction structure of this embodiment is applied to an electric motor: when current is applied to the spiral coil 1, the spiral coil 1 will rotate, and the torque can be output through the limit wheel 10.
[0049] The advantages of the electromagnetic induction structure in this embodiment are: as an electric motor, the transmission efficiency is slightly low, but as a generator, compared with the traditional generator structure, this scheme can output DC power without commutator and rectifier, and the rotor rotation resistance is small and the energy conversion efficiency is high. Example
[0050] See Figure 9 and Figure 10 The electromagnetic induction structure includes a magnet assembly and a helical coil 1. In this embodiment, the helical coil 1 is a ring-shaped helical coil 1, and the magnet assembly adopts the following... Figure 8 and Figure 9 The radially magnetized unipolar magnetic ring 41 shown can also be used as... Figure 14 , Figure 15 and Figure 16 The ring-shaped magnet array 42 shown.
[0051] The magnet assembly is mounted on the magnet bracket 5. The spiral coil 1 has an inner coil support 2 inside and a fixing bracket 3 for fixing the spiral coil 1 outside. The inner coil support 2 is sleeved on the magnet bracket 5. The magnet assembly is located inside the spiral coil 1. The limiting wheel 10 cooperates with the magnet assembly / magnet bracket 5 to drive the magnet assembly to move, so that the magnet assembly moves relative to the spiral coil 1.
[0052] The magnet support 5 is a split support, which is composed of multiple support units 51. Each support unit 51 includes a thick section 511 and a thin section 512. The magnet assembly is installed in the thin section 512, and the end of the thin section 512 is inserted into the cavity of the thick section 511 of the adjacent support unit 51.
[0053] In this embodiment, the radius of the magnetic ring 41 is smaller than the radius of the spiral coil 1, and the electric ring and brush are eliminated.
[0054] The electromagnetic induction structure of this embodiment is applied to a generator: at least three limiting wheels 10 are required, and the limiting wheels 10 are concave in an arc shape, matching the circular convex shape of the magnetic ring 41 / magnet bracket 5, which ensures that the magnetic ring 41 / magnet bracket 5 rotates stably without displacement in three-dimensional space. At least one of the three limiting wheels 10 is connected to the prime mover as the driving wheel, and the rest are driven wheels. When the prime mover drives the driving wheel to rotate, the driving wheel causes the magnetic ring 41 / magnet bracket 5 to rotate through friction, and the coil generates an induced current. In this structure, the coil is fixed, and the current can be directly led out from both ends of the coil wire. Note that in this structure, it is not recommended to use a high-permeability material for the inner support 2 of the coil. Because a high-permeability inner support, placed between the magnetic ring 41 and the spiral coil 1, will concentrate the magnetic field diffused in space on the inner support, greatly weakening the magnetic field left for the spiral coil 1, which is not conducive to generating an induced electromotive force.
[0055] The electromagnetic induction structure in this embodiment is applied to an electric motor: when current is applied to the coil, the magnetic ring 41 / magnet bracket 5 will rotate, and the torque can be output through the limit wheel 10.
[0056] The advantages of the electromagnetic induction structure in this embodiment are: as a motor, the transmission efficiency is slightly low; but as a generator, compared with the traditional generator structure, this scheme can output DC power without commutator and rectifier, and the rotor rotation resistance is small and the energy conversion efficiency is high. Example
[0057] See Figure 11 and Figure 12 The electromagnetic induction structure includes a magnet assembly and a helical coil 1. In this embodiment, the magnet assembly adopts the following... Figure 14 , Figure 15 and Figure 16 The annular magnet array 42 shown has two or more groups. The spiral coil 1 is segmented into two or more coil units 1a, with the number of coil units 1a matching the number of annular magnet arrays 42. The axial length of the coil units 1a matches the axial length of the annular magnet arrays 42, and the coil units 1a are connected by wires. Each group of annular magnet arrays 42 is mounted on a magnet support 5. Each coil unit 1a has an internal coil support. The coil unit 1a is fixed to the base by a fixed bracket 3. The magnet support 5 has a notch 52 for moving to avoid the fixed bracket 3. The magnet support 5 is connected to a fixed sleeve 15 via a bracket connecting rod 14. The fixed sleeve 15 is connected to a central shaft 13 mounted on the base. The central shaft 13 drives the magnet support 5 to move relative to the fixed bracket 3, thereby moving the annular magnet array 42 relative to the spiral coil 1. In this embodiment, the internal coil support 2 can be made of a high-permeability material.
[0058] In a complete toroidal coil, only the portion swept by the magnet array generates an induced electromotive force (EMF); the remaining portions not only fail to generate an EMF but also lose it. In this embodiment, the toroidal spiral coil 1 is segmented into coil units 1a, the same number as the toroidal magnet array 42. The axial length of each coil unit 1a is the same as the axial length of the toroidal magnet array 42, and the coil units 1a are directly connected by simple wires, which reduces EMF loss.
[0059] The electromagnetic induction structure of this embodiment is applied to a generator: the central shaft 13 is connected to the prime mover. When the prime mover inputs torque, the magnet bracket 5 drives the annular magnet array 42 to rotate around the spiral coil. The induced current generated by the coil can be directly led out from both ends of the coil wire.
[0060] The electromagnetic induction structure in this embodiment is applied to an electric motor: when current is applied to the coil, the magnet bracket 5 will rotate, and the torque can be output through the central shaft 13.
[0061] Advantages of the electromagnetic induction structure in this embodiment: Compared with embodiments 3 and 4, this solution is rigidly connected to the external machinery through the central shaft 13. Compared with friction transmission, this rigid transmission reduces friction loss in the process of mechanical energy transmission.
[0062] like Figure 17 As shown, the principle of this invention's electromagnetic induction structure involves a radial unipolar magnetic ring 41 fitted around a helical coil 1. Assuming the magnetic poles of the ring are distributed as inner N and outer S, a magnified view reveals that, compared to the structure of a voice coil motor, the improved design's coil conductor is completely perpendicular to the magnetic field lines of the magnetic ring. If this conductor moves along the axial direction of the magnetic ring, the induced electromotive force generated by the conductor is significantly higher than that of a voice coil motor, making this design practically valuable for power generation. When current is applied to the conductor, it experiences an Ampere force in the magnetic field and moves along the axial direction of the magnetic ring. The electromagnetic stress of the magnetic ring and coil does not change with the coil length; therefore, compared to a voice coil motor, the length of the coil and the stroke of the magnetic ring in this design can be much longer.
[0063] The experiment revealed that when the spiral coil 1 is placed inside the radial monopole magnetic ring 41, and there are multiple layers of wires along the radial direction, the induced electromotive force generated by the coil is higher when the inner support is replaced with a high-permeability material. This is because the high-permeability material causes the magnetic field lines that diffuse into space inside the magnetic ring to converge inside, allowing more magnetic field lines to pass through the coil wires, thus resulting in a higher induced electromotive force.
[0064] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.
Claims
1. An electromagnetic induction structure, comprising a magnet assembly and a helical coil, characterized in that: The magnet assembly is coaxially placed outside or inside the helical coil to provide the helical coil with a radially unipolar magnetic field, and the magnetic field lines are perpendicular to the coil wires. The magnet assembly and the helical coil move relative to each other.
2. The electromagnetic induction structure according to claim 1, characterized in that: The spiral coil can be a straight spiral coil, an arc spiral coil, or a ring spiral coil.
3. The electromagnetic induction structure according to claim 1, characterized in that: The magnet assembly is a radially magnetized unipolar magnetic ring.
4. The electromagnetic induction structure according to claim 1, characterized in that: The magnet assembly is a ring magnet array consisting of multiple magnets with the same polarity oriented in a ring arrangement of the coil.
5. The electromagnetic induction structure according to claim 4, characterized in that: The magnets that make up the ring-shaped magnet array are square magnets, tile-shaped magnets, and round magnets.
6. The electromagnetic induction structure according to claim 1, characterized in that: The magnet assembly is mounted on the magnet bracket. The spiral coil has an internal coil support. The fixed bracket fixes the two ends of the internal coil support. The magnet bracket drives the magnet assembly to move relative to the spiral coil.
7. The electromagnetic induction structure according to claim 1, characterized in that: The magnet assembly is mounted on the magnet bracket. The spiral coil has an inner coil support inside and a fixing bracket for fixing the spiral coil is mounted outside. The inner coil support is sleeved on the magnet bracket. The magnet assembly is located inside the spiral coil. The limiting wheel cooperates with the magnet assembly / magnet bracket to drive the magnet assembly to move, so that the magnet assembly moves relative to the spiral coil.
8. The electromagnetic induction structure according to claim 7, characterized in that: The magnet support is a split support, which is composed of multiple support units. The support unit is divided into thick and thin sections. The magnet assembly is installed in the thin section, and the end of the thin section is inserted into the thick section cavity of the adjacent support unit.
9. The electromagnetic induction structure according to claim 1, characterized in that: The magnet assembly is mounted on the magnet bracket. The spiral coil has an inner support inside. The limiting wheel cooperates with the inner support to drive the spiral coil and the inner support to move, so that the spiral coil moves relative to the magnet assembly. The spiral coil is provided with a power transmission ring, and a power-taking brush is provided at the power transmission ring.
10. The electromagnetic induction structure according to claim 1, characterized in that: The spiral coil is segmented into multiple coil units, and the magnet assembly is a ring magnet array. The number of coil units is the same as the number of ring magnet arrays, and the axial length of the coil units is the same as the axial length of the ring magnet arrays. The coil units are connected by wires. Each ring magnet array is set on a magnet support. Each coil unit has an internal coil support. The coil unit is fixed to the base by a fixed bracket. The magnet support has a notch to avoid the fixed bracket when moving. The magnet support is connected to a central shaft. The central shaft drives the magnet support to move relative to the fixed bracket, thereby causing the magnet assembly to move relative to the spiral coil.