Electromagnetic induction structure

Abstract

The invention discloses an electromagnetic induction structure which comprises a magnet assembly and a spiral coil and is characterized in that the magnet assembly is coaxially arranged outside or inside the spiral coil to provide a radial single-polarity magnetic field for the spiral coil, the magnetic induction line of the magnetic field is perpendicular to a coil wire, and the magnet assembly and the spiral coil move relatively. A radial single-pole magnetic ring for radiation magnetization or a common magnet with the same polarity facing the coil and arranged annularly is adopted as a magnet assembly to provide a radial single-polarity magnetic field for the spiral coil, and when the electromagnetic induction structure is applied to a generator, electric energy output is larger than that of a voice coil motor; when being applied to a motor, the motor can do linear / arc / circular motion, and the stroke is longer than that of a voice coil motor while the output power is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of electromagnetic power generation, and in particular to an electromagnetic induction structure. Background Art

[0002] The electromagnetic induction phenomenon is caused by the conductor cutting the magnetic flux line or the change of the magnetic flux of the closed coil, which generates an induced electromotive force. If the conductor is closed into a loop, an induced current will be formed. On the contrary, if the conductor is energized, the conductor will be displaced in the magnetic field. Figure 1 (a) shows the principle model of the voice coil motor, whose core components are a helical coil 1 and an axially magnetized cylindrical magnet 13. A helical coil is a coil made by winding a wire in a spiral shape. The axially magnetized cylindrical magnet (hereinafter referred to as the magnetic column) has a magnetic pole distribution with one end of the axial direction being the N pole and the other end being the S pole. When the magnetic column penetrates along the axis of the coil, the coil wire will generate an induced electromotive force. Cut a part of the coil and draw the magnetic flux lines of the magnetic column, see Figure 1 In (b), we can see that the coil moves along the axis of the magnetic column, and its trajectory is almost parallel to the magnetic flux lines of the magnetic column, which makes the induced electromotive force generated by the coil wire very weak, so the structure of the voice coil motor has too little power when used to generate electricity. When current is passed through the coil, the magnetic column will move along the axis of the coil. The closer the magnetic flux lines of the magnetic column are to the magnetic pole, the denser the magnetic flux lines are distributed; the farther away from the magnetic pole, the sparser the magnetic flux lines are distributed. The change in the density of the magnetic flux lines brings about a change in the stress of the magnetic column and the energized coil, and the stress intensity gradually decreases from the two ends of the magnetic column to the middle. If the magnetic column is too long, the output power will drop sharply when the coil reaches the middle of the magnetic column. In order to reduce the fluctuation of the output power, the voice coil motor has to use a relatively short magnetic column. Therefore, as a motor, the stroke of the voice coil motor is generally not long. It can be seen that the structure of the voice coil motor has too little power when used as a generator, and the stroke is too short when used as a motor. Summary of the invention

[0003] In view of the defects existing in the prior art, the present invention provides an electromagnetic induction structure, which 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 movement stroke is longer than that of voice coil motors.

[0004] In order to achieve the above purpose, the technical solution adopted in this application is: The electromagnetic induction structure includes a magnet assembly and a spiral coil. The magnet assembly is coaxially placed outside or inside the spiral coil to provide a radial single-polarity magnetic field for the spiral coil, and the magnetic flux lines of the magnetic field are perpendicular to the coil conductor. The magnet assembly and the spiral coil move relative to each other.

[0005] The spiral coil is a linear spiral coil, an arc-shaped spiral coil, or a ring-shaped spiral coil.

[0006] The magnet assembly is a radial monopolar magnetic ring that is radiantly magnetized.

[0007] The magnet assembly is a ring-shaped magnet array consisting of a plurality of common magnets with the same polarity arranged in a ring shape toward the coil.

[0008] More preferably, the magnets constituting the annular magnet array are square magnets, tile-shaped magnets, or circular magnets.

[0009] The magnet assembly is arranged on the magnet bracket, a coil inner support is arranged inside the spiral coil, two ends of the coil inner support are fixed by the fixed bracket, and the magnet bracket moves relative to the coil inner support to make the magnet assembly move relative to the spiral coil.

[0010] The magnet assembly is arranged on the magnet bracket, a coil inner support is arranged inside the spiral coil, a bracket for fixing the coil is arranged outside the spiral coil, the coil inner support is sleeved on the magnet bracket, the magnet assembly is located inside the spiral coil, and 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.

[0011] The magnet bracket is a split bracket, which is composed of a plurality of bracket units. The bracket unit is divided into a thick section and a thin section. The magnet assembly is installed in the thin section, and the end of the thin section is inserted into the thick section lumen of the adjacent bracket unit.

[0012] The magnet assembly is arranged on the magnet bracket, a coil inner support is arranged inside the spiral coil, the limiting wheel cooperates with the coil inner support to drive the spiral coil and the coil inner support to move, so that the spiral coil moves relative to the magnet assembly, a power transmission ring is arranged on the spiral coil, and a power brush is arranged on the power transmission ring.

[0013] The spiral coil is segmented into multiple groups of coil units, the magnet assembly is an annular magnet array, the number of coil units is consistent with the number of annular magnet arrays, the axial length of the coil unit is consistent with the axial length of the annular magnet array, the coil units are connected by wires, each group of annular magnet arrays is respectively arranged on a magnet bracket, each group of coil units is provided with a coil inner support, the coil unit is fixed to the base by a fixed bracket, the magnet bracket is provided with a notch for avoiding the fixed bracket when moving, the magnet bracket is connected to the central axis, the central axis drives the magnet bracket to move relative to the fixed bracket, thereby causing the magnet assembly to move relative to the spiral coil.

[0014] According to actual needs, the inner support of the coil can be made of high magnetic permeability material.

[0015] The beneficial effect of the present invention is that a radial monopolar magnetic ring with radiation magnetization or a common magnet with the same polarity arranged in a ring toward the coil is used as a magnet assembly to provide a radial single polarity magnetic field to the spiral coil, and the magnetic flux lines of the magnetic field are perpendicular to the coil conductor. When the electromagnetic induction structure is applied to a generator, the 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 motion stroke than a voice coil motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative labor.

[0017] Figure 1 It is a principle model diagram of a traditional voice coil motor and a schematic diagram of the magnetic flux lines distribution.

[0018] Figure 2 It is a schematic diagram of the overall structure of the electromagnetic induction structure of Example 1.

[0019] Figure 3 It is a schematic diagram of the decomposition of the electromagnetic induction structure of Example 1.

[0020] Figure 4 It is a schematic diagram of the overall structure of the electromagnetic induction structure of Example 2.

[0021] Figure 5 It is a schematic diagram of the decomposition of the electromagnetic induction structure of Example 2.

[0022] Figure 6 It is a schematic diagram of the overall structure of the electromagnetic induction structure of Example 3.

[0023] Figure 7 It is a schematic diagram of the decomposition of the electromagnetic induction structure of Example 3.

[0024] Figure 8 It is a schematic diagram of the coordination between the limiting wheel, the spiral coil and the inner support of the coil in Example 3.

[0025] Fig. 9 It is a schematic diagram of the overall structure of the electromagnetic induction structure of Example 4.

[0026] Fig.10 It is a schematic diagram of the decomposition of the electromagnetic induction structure of Example 4.

[0027] Fig.11 It is a schematic diagram of the coordination between the limiting wheel, the magnetic ring and the magnet bracket in Example 4.

[0028] Fig.12It is a schematic diagram of the overall structure of the electromagnetic induction structure of Example 5.

[0029] Fig.13 It is a schematic diagram of the decomposition of the electromagnetic induction structure of Example 5.

[0030] Fig.14 , Fig.15 and Fig.16 is a schematic diagram of a ring magnet array.

[0031] Fig.17 It is a principle analysis diagram of the present invention.

[0032] In the figure: 1 spiral coil, 1a coil unit, 2 coil inner support, 3 fixed bracket, 41 radial monopole magnetic ring, 42 annular magnet array, 5 magnet bracket, 51 bracket unit, 511 thick section, 512 thin section, 52 notch, 6 base, 7 linear guide, 8 support, 9 connecting rod, 10 limiting wheel, 11 transmission ring, 12 brush removal, 13 middle shaft, 14 bracket connecting rod, 15 fixed sleeve. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] Example 1 See also Figure 2 and Figure 3 , the electromagnetic induction structure includes a magnet assembly and a spiral coil 1. In this embodiment, the spiral coil 1 is a linear spiral coil. The magnet assembly can be used as follows Figure 2 and Figure 3 The radial monopole magnetic ring 41 of radiation magnetization is shown in FIG. The radial monopole magnetic ring 41 has a high manufacturing cost and can be made of Fig.12 , Fig.13 and Fig.14 The annular magnet array 42 shown replaces the radial monopolar magnetic ring 41, that is, the magnet assembly is an annular magnet array 42 composed of a plurality of common magnets with the same polarity arranged in an annular shape toward the coil. Fig.14 , Fig.15 and Fig.16 The annular magnet array 42 is composed of square magnets, tile-shaped magnets and circular magnets respectively.

[0035] The magnet assembly is arranged on the magnet support 5, and the magnet assembly is located outside the spiral coil 1. The spiral coil 1 is provided with a coil inner support 2, and a fixed support 3 fixes both ends of the coil inner support 2. The fixed support 3 is fixed on the base 6. The base 6 is provided with a linear guide rail 7. The magnet support 5 moves along the linear guide rail 7, so that the magnet assembly moves relative to the spiral coil 1. In this embodiment, the coil inner support 2 can be made of a high magnetic permeability material.

[0036] The electromagnetic induction structure of this embodiment is applied to a generator: after assembling the various components, when the prime mover drives the magnet bracket 5 to move along the linear guide 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 from both ends of the coil wire.

[0037] The electromagnetic induction structure of this embodiment is applied to the motor: after assembling the components, 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 a motor that outputs linear motion.

[0038] Advantages of the electromagnetic induction structure of this embodiment: Compared with the electromagnetic induction structure of the voice coil motor, the electromagnetic induction structure of this embodiment has a higher output power when used as a generator; and a longer movement stroke when used as a motor.

[0039] Example 2 See also Figure 4 and Figure 5 , the electromagnetic induction structure includes a magnet assembly and a spiral coil 1. In this embodiment, the spiral coil 1 is an arc-shaped spiral coil 1. The magnet assembly can be used as follows Figure 4 and Figure 5 The radial monopolar magnetic ring 41 of radiation magnetization shown in FIG. 4 may also be used as Fig.14 , Fig.15 and Fig.16 An annular magnet array 42 is shown.

[0040] The magnet assembly is arranged on the magnet support 5, and the magnet assembly is located outside the spiral coil 1. The spiral coil 1 is provided with a coil inner support 2 matching the arc-shaped spiral coil 1. The fixed support 3 fixes the two ends of the coil inner support 2. The fixed support 3 is fixed on the base 6. The base 6 is provided with a support 8. One end of the connecting rod 9 is connected to the magnet support 5, and the other end is connected to the support 8. The connecting rod 9 drives the magnet support 5 to move relative to the coil inner support 2 with the support 8 as the rotation fulcrum, so that the magnet assembly moves relative to the spiral coil 1. In this embodiment, the coil inner support 2 can be made of a high magnetic permeability material.

[0041] 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 the magnet assembly along the arc of the coil, the coil generates an induced current, which can be drawn out from both ends of the coil wire.

[0042] The electromagnetic induction structure of this embodiment is applied to an electric motor: after the various components are assembled, when current is passed through the coil, the magnet assembly will move in an arc along the coil. At this time, the electromagnetic induction structure can be used as an electric motor that outputs arc motion.

[0043] The electromagnetic induction structure of this embodiment has the following advantages: compared with the electromagnetic induction structure of a voice coil motor, the electromagnetic induction structure has a higher output efficiency when used as a generator; and has a longer motion stroke when used as a motor.

[0044] Example 3 See also Figure 6 , Figure 7 and Figure 8 , the electromagnetic induction structure includes a magnet assembly and a spiral coil 1. In this embodiment, the spiral coil 1 is a ring-shaped spiral coil 1. The magnet assembly can be used as follows Figure 6 and Figure 7 The radial monopolar magnetic ring 41 of radiation magnetization shown in FIG. 4 may also be used as Fig.14 , Fig.15 and Fig.16 An annular magnet array 42 is shown.

[0045] The magnet assembly is arranged on the magnet support 5, a coil inner support 2 is arranged inside the spiral coil 1, and the limiting wheel 10 cooperates with the coil inner support 2 to drive the spiral coil 1 and the coil inner support 2 to move, so that the spiral coil 1 moves relative to the magnet assembly, and a power transmission ring 11 is arranged on the spiral coil 1, and a power brush 12 is arranged at the power transmission ring 11. In this embodiment, the coil inner support 2 can be made of a high magnetic permeability material.

[0046] The electromagnetic induction structure of this embodiment is applied to a generator: according to the principle that three points determine a plane, this scheme requires at least three limit wheels 10, and the limit wheels 10 are arc-shaped and concave, which match the circular convexity of the spiral coil 1 and the coil inner support 2, and can ensure that the spiral coil 1 rotates stably without displacement in three-dimensional space. At least one of the three limit wheels 10 is connected to the prime mover as a driving wheel, and the rest are passive 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 passes through the magnet assembly to generate an induced current. Two power transmission rings 11 are fixed to the coil, respectively connected to the two ends of the spiral coil 1 wire, and the brush 12 is brought into contact with the power transmission ring 11 to lead out the current generated by the coil.

[0047] The electromagnetic induction structure of this embodiment is applied to the motor: when current is passed through the spiral coil 1 , the spiral coil 1 will rotate, and the torque can be output through the limiting wheel 10 .

[0048] The electromagnetic induction structure of this embodiment has the following advantages: as a motor, the transmission efficiency is slightly low, but as a generator, compared with the traditional generator structure, this solution can output DC power without a commutator and a rectifier, and the rotor rotation resistance is small and the energy conversion efficiency is high.

[0049] Example 4 See also Fig. 9 and Fig.10 , the electromagnetic induction structure includes a magnet assembly and a spiral coil 1. In this embodiment, the spiral coil 1 is a ring-shaped spiral coil 1. The magnet assembly adopts Figure 8 and Fig. 9 The radial monopolar magnetic ring 41 of radiation magnetization shown in FIG. 4 may also be used as Fig.14 , Fig.15 and Fig.16 An annular magnet array 42 is shown.

[0050] The magnet assembly is arranged on the magnet bracket 5, a coil inner support 2 is arranged inside the spiral coil 1, a fixed bracket 3 for fixing the spiral coil 1 is arranged outside the spiral coil 1, the coil inner support 2 is sleeved on the magnet bracket 5, the magnet assembly is located inside the spiral coil 1, and 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.

[0051] The magnet bracket 5 is a split bracket, which is composed of multiple bracket units 51. The bracket unit 51 includes a thick section 511 and a thin section 512. The magnet assembly is installed in the thin section 512. The end of the thin section 512 is inserted into the lumen of the thick section 511 of the adjacent bracket unit 51.

[0052] 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 the brush are eliminated.

[0053] The electromagnetic induction structure of this embodiment is applied to the generator: at least three limiting wheels 10 are required, and the limiting wheels 10 are arc-shaped and concave, which matches the circular convexity of the magnetic ring 41 / magnet bracket 5, so as to ensure 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 a driving wheel, and the rest are passive wheels. When the prime mover drives the driving wheel to rotate, the driving wheel causes the magnetic ring 41 / magnet bracket 5 to rotate by friction, and the coil generates an induced current. The coil of this structure is fixed, and the current can be directly drawn from both ends of the coil wire. Note that in this structure, it is not recommended to use high magnetic permeability materials for the coil inner support 2. Because the high magnetic permeability inner support is blocked between the magnetic ring 41 and the spiral coil 1, the magnetic field diffused in the space will be concentrated on the inner support, and the magnetic field left for the spiral coil 1 will be greatly weakened, which is not conducive to the generation of induced electromotive force.

[0054] The electromagnetic induction structure of this embodiment is applied to the motor: when the coil is supplied with current, the magnetic ring 41 / magnet support 5 will rotate, and the torque can be output through the limiting wheel 10 .

[0055] The advantages of the electromagnetic induction structure of this embodiment are: as a motor, the transmission efficiency is slightly low; but as a generator, compared with the traditional generator structure, this solution can output DC power without a commutator and a rectifier, and the rotor rotation resistance is small and the energy conversion efficiency is high.

[0056] Example 5 See also Fig.11 and Fig.12 , the electromagnetic induction structure includes a magnet assembly and a spiral coil 1. In this embodiment, the magnet assembly is as follows Fig.14 , Fig.15 and Fig.16 The annular magnet array 42 shown in the figure has two or more groups of annular magnet arrays 42, and the spiral coil 1 is divided into two or more groups of coil units 1a, the number of coil units 1a is consistent with the number of annular magnet arrays 42, the axial length of coil units 1a is consistent with the axial length of annular magnet arrays 42, and the coil units 1a are connected by wires. Each group of annular magnet arrays 42 is respectively arranged on a magnet support 5, and a coil inner support is arranged inside each group of coil units 1a. The coil unit 1a is fixed to the base by a fixed support 3, and a notch 52 is arranged on the magnet support 5 to avoid the fixed support 3 when moving. The magnet support 5 is connected to the fixed sleeve 15 through a support connecting rod 14, and the fixed sleeve 15 is connected to the central axis 13 arranged on the base. The central axis 13 drives the magnet support 5 to move relative to the fixed support 3, so that the annular magnet array 42 moves relative to the spiral coil 1. In this embodiment, the coil inner support 2 can be made of a high magnetic permeability material.

[0057] For a complete annular coil, only the part swept by the magnet array generates induced electromotive force, and the rest of the part not only does not generate but also loses induced electromotive force. In this embodiment, the annular spiral coil 1 is segmented into coil units 1a with the same number as the annular magnet array 42, and the axial length of the coil unit 1a is consistent with the axial length of the annular magnet array 42. The coil units 1a are directly connected by simple wires, which reduces the electromotive force loss.

[0058] 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, and the induced current generated by the coil can be directly drawn out from both ends of the coil wire.

[0059] The electromagnetic induction structure of this embodiment is applied to the motor: when the coil is supplied with current, the magnet bracket 5 will rotate, and the torque can be output through the central shaft 13 .

[0060] Advantages of the electromagnetic induction structure of this embodiment: Compared with Embodiment 3 and Embodiment 4, this solution is rigidly connected to the external machinery through the central axis 13. Compared with friction transmission, this rigid transmission reduces the friction loss in the process of mechanical energy transmission.

[0061] like Fig.17 As shown, the electromagnetic induction structure principle of the present invention is that a radial monopole magnetic ring 41 is sleeved outside a section of spiral coil 1. Assuming that the magnetic pole distribution of the magnetic ring is N inside and S outside, a section is enlarged for display. It can be seen that compared with the structure of the voice coil motor, the coil wire of the improved scheme is completely perpendicular to the magnetic flux lines of the magnetic ring. If this section of wire moves along the axial direction of the magnetic ring, the induced electromotive force generated by the wire is doubled compared with the voice coil motor, which makes this scheme practical for power generation. When the wire is energized, the wire moves along the axial direction of the magnetic ring under the action of the Ampere force in the magnetic field. The electromagnetic stress between the magnetic ring and the coil does not change with the length of the coil, so compared with the voice coil motor, the length of the coil and the stroke of the magnetic ring in this scheme can be made very long.

[0062] It is found in the experiment that when the spiral coil 1 is placed inside the radial monopolar 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 magnetic permeability material. The reason is that the high magnetic permeability material allows the magnetic flux lines that diffuse into the space from the inside of the magnetic ring to converge inside it, allowing more magnetic flux lines to pass through the coil wire, so the induced electromotive force is higher.

[0063] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An electromagnetic induction structure, comprising a magnet assembly and a spiral coil, characterized in that: The magnet assembly is coaxially arranged outside or inside the spiral coil to provide a radial single-polarity magnetic field for the spiral coil, and the magnetic flux lines of the magnetic field are perpendicular to the coil conductor. The magnet assembly and the spiral coil move relative to each other.

2. The electromagnetic induction structure according to claim 1, characterized in that: The spiral coil is a linear spiral coil, an arc-shaped spiral coil, or a ring-shaped spiral coil.

3. The electromagnetic induction structure according to claim 1, characterized in that: The magnet assembly is a radial monopolar magnetic ring that is radiantly magnetized.

4. The electromagnetic induction structure according to claim 1, characterized in that: The magnet assembly is a ring-shaped magnet array consisting of a plurality of common magnets with the same polarity arranged in a ring shape toward the coil.

5. The electromagnetic induction structure according to claim 4, characterized in that: The magnets constituting the annular magnet array are square magnets, tile-shaped magnets, and circular magnets.

6. The electromagnetic induction structure according to claim 1, characterized in that: The magnet assembly is arranged on the magnet bracket, a coil inner support is arranged inside the spiral coil, two ends of the coil inner support are fixed by the fixed bracket, and 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 arranged on the magnet bracket, a coil inner support is arranged inside the spiral coil, a fixed bracket for fixing the spiral coil is arranged outside the spiral coil, the coil inner support is sleeved on the magnet bracket, the magnet assembly is located inside the spiral coil, and 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 bracket is a split bracket, which is composed of a plurality of bracket units. The bracket unit is divided into a thick section and a thin section. The magnet assembly is installed in the thin section, and the end of the thin section is inserted into the thick section lumen of the adjacent bracket unit.

9. The electromagnetic induction structure according to claim 1, characterized in that: The magnet assembly is arranged on the magnet bracket, a coil inner support is arranged inside the spiral coil, the limiting wheel cooperates with the coil inner support to drive the spiral coil and the coil inner support to move, so that the spiral coil moves relative to the magnet assembly, a power transmission ring is arranged on the spiral coil, and a power brush is arranged on the power transmission ring.

10. The electromagnetic induction structure according to claim 1, characterized in that: The spiral coil is segmented into multiple groups of coil units, the magnet assembly is an annular magnet array, the number of coil units is consistent with the number of annular magnet arrays, the axial length of the coil unit is consistent with the axial length of the annular magnet array, the coil units are connected by wires, each group of annular magnet arrays is respectively arranged on a magnet bracket, each group of coil units is provided with a coil inner support, the coil unit is fixed to the base by a fixed bracket, the magnet bracket is provided with a notch for avoiding the fixed bracket when moving, the magnet bracket is connected to the central axis, the central axis drives the magnet bracket to move relative to the fixed bracket, thereby causing the magnet assembly to move relative to the spiral coil.

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