Moving-coil motor

Abstract

The utility model provides a moving-coil motor which comprises a rotor assembly and a stator assembly, the rotor assembly comprises a substrate and a rotating shaft, the substrate is composed of a plurality of layers of circuit boards, a first coil winding and a second coil winding are arranged on the two faces of the substrate respectively, and the first coil winding and the second coil winding are symmetrically distributed relative to the rotating shaft. The stator assembly comprises a permanent magnet set, the permanent magnet set is suspended on the outer side of the first coil winding and the outer side of the second coil winding, and when the first coil winding and the second coil winding are powered on, the first coil winding and the second coil winding repeatedly deflect with the rotating shaft as the axis. The permanent magnet group covers the deflection ranges of the two sides of the first coil winding and the second coil, the magnets are arranged on the two sides of the coil winding, so that the coils are always covered by a uniform high-strength magnetic field in the whole motion range, magnetic field gradient interference is avoided, and the dynamic response is faster and more stable; therefore, more accurate displacement and speed control can be realized, and the method is suitable for being applied to precise instruments needing high-precision positioning.

Description

Technical Field

[0001] This invention relates to the field of electric motors, and more specifically to a moving-coil motor. Background Technology

[0002] A moving-coil motor typically refers to a motor in which permanent magnets are placed on both sides of a sheet-like winding. By energizing the winding, a magnetic field is generated, and the interaction between the magnetic field of the winding and the magnetic field of the permanent magnets drives the sheet-like winding to rotate.

[0003] US Patent No. 10133059B2 discloses a moving coil motor, which is similar in principle to the one mentioned above. However, in the above patent, when the winding is rotating, the permanent magnet cannot completely cover it. Therefore, the entire coil cannot always be in a uniform magnetic field throughout the entire range of motion. Consequently, under the interference of magnetic field gradient, it is impossible to achieve more precise displacement, speed or force control of the winding rotation. Summary of the Invention

[0004] To address the aforementioned problems, this application provides a moving-coil motor, including a rotor assembly and a stator assembly. The rotor assembly includes a base plate and a rotating shaft passing through the end face of the base plate. A first coil winding and a second coil winding are evenly distributed on both end faces of the base plate, and the first and second coil windings are symmetrically distributed with respect to the rotating shaft. The stator assembly includes a permanent magnet assembly, which is respectively suspended outside the first and second coil windings. When the first and second coil windings are energized, they repeatedly deflect around the rotating shaft, and the permanent magnet assembly can cover the deflection range of the first and second coil windings.

[0005] Furthermore, the first coil winding and the second coil winding are generally fan-shaped, and first coil boundaries and second coil boundaries are formed on both sides along the length direction of the first coil winding and the second coil winding. The permanent magnet assembly has first magnet boundaries and second magnet boundaries formed on both sides along its length direction. When the substrate is deflected, the first coil boundary and the first magnet boundary on one side of the rotating shaft coincide, and the second coil boundary and the second magnet boundary on the opposite side of the rotating shaft coincide.

[0006] Furthermore, a first hollow portion is formed in both the first coil winding and the second coil winding. The first hollow portion forms a first inner boundary and a second inner boundary of the coil within the first coil winding and the second coil winding. The permanent magnet assembly includes a first permanent magnet and a second permanent magnet. The first magnet boundary and the second magnet boundary are respectively disposed on the outer sides of the first permanent magnet and the second permanent magnet. A first inner boundary and a second inner boundary of the magnet are formed on the inner sides of the first permanent magnet and the second permanent magnet, respectively. When the substrate is deflected, the inner boundary of the second coil on one side of the rotating shaft coincides with the inner boundary of the second magnet, and the inner boundary of the first coil and the inner boundary of the second magnet on the opposite side of the rotating shaft coincide.

[0007] Furthermore, within the first coil winding and the second coil winding, the wiring pattern between the boundary of the first coil and the inner boundary of the first coil, as well as the boundary of the second coil and the inner boundary of the second coil, is a straight line.

[0008] Furthermore, a first coil arc surface and a second coil arc surface are connected between the inner boundary of the first coil and the inner boundary of the second coil. A first magnet arc surface and a second magnet arc surface are also connected between the first magnet boundary and the inner boundary of the first magnet, as well as between the second magnet boundary and the inner boundary of the second magnet. The arc and distance between the first coil arc surface and the first magnet arc surface, and between the second coil arc surface and the second magnet arc surface, are the same.

[0009] Furthermore, a first reference line is provided in the middle between the inner boundary of the first coil and the inner boundary of the second coil in the first hollow part. When the first coil winding and the second coil winding are not energized, the angle between the inner boundary of the first magnet and the inner boundary of the second magnet and the first reference line is between 7 degrees and 7.5 degrees.

[0010] Furthermore, a second hollow portion is provided between the first coil winding and the second coil winding. When the substrate begins to sway, the first permanent magnet and the second permanent magnet can be partially suspended outside the second hollow portion.

[0011] Furthermore, the rotating shaft has a hollow structure, and conductive points are provided on the substrate. The conductive points are connected to the first coil winding and the second coil winding. Conductive lines are provided inside the rotating shaft, and the conductive lines pass through the rotating shaft and are electrically connected to the conductive points.

[0012] Furthermore, a fixed base is provided between the rotor assembly and the stator assembly, the rotating shaft passes through the fixed base and can rotate within the fixed base, a fixed plate is provided within the fixed base, the fixed plate is arranged parallel to the base plate, and the permanent magnet assembly is fixed within the fixed plate.

[0013] Furthermore, an end cap is provided on one side of the fixed base, the rotating shaft extends out from the end cap, a limiting groove is provided inside the end cap, a limiting rod is provided inside the limiting groove, and the limiting rod is inserted into the rotating shaft along the vertical direction of the rotating shaft.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] Compared with the prior art:

[0016] This application provides a permanent magnet group outside the first and second coil windings. When the first and second coil windings are energized, the permanent magnet group covers the deflection range of the first and second coil windings. This ensures that the coil is always in a uniform magnetic field throughout its entire range of motion. The generated Lorentz force is strictly proportional to the current, eliminating the need to compensate for the influence of nonlinear magnetic field distribution. Furthermore, the uniform magnetic field ensures that the coil acceleration is determined solely by the current, without magnetic field gradient interference, resulting in faster and more stable dynamic response. Thus, under the same output force, the linear relationship of this application simplifies the control algorithm, enabling more precise displacement, velocity, or force control. It is suitable for high-precision positioning (such as optical equipment and precision instruments). In addition, compared to existing technologies, this application provides magnets on both sides of the coil, resulting in a better magnetic field strength compared to providing magnets on only one side.

[0017] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is an exploded view of the overall structure of the present invention;

[0020] Figure 2 This is a diagram showing the positional relationship between the substrate and the permanent magnet assembly in the initial state of the rotor assembly of the present invention.

[0021] Figure 3 This is a diagram showing the positional relationship between the substrate and the permanent magnet assembly in the clockwise rotation state of the rotor assembly of the present invention.

[0022] Figure 4 This is a diagram showing the positional relationship between the substrate and the permanent magnet assembly in the counterclockwise rotation state of the rotor assembly of the present invention.

[0023] Figure 5 This diagram shows the positional relationship between the first permanent magnet, the second permanent magnet, and the first hollow portion in the initial state of the rotor assembly of the present invention.

[0024] Figure 6 This diagram shows the positional relationship between the first and second permanent magnets and the first reference line in the initial state of the rotor assembly of the present invention.

[0025] Figure 7 This is a schematic diagram of the structure of the fixing base of the present invention;

[0026] Figure 8 This is a schematic diagram of the end cap structure of the present invention.

[0027] The reference numerals and names in the figure are as follows:

[0028] Rotor assembly 10, stator assembly 20, base plate 100, rotating shaft 200, first coil winding 110, second coil winding 120, permanent magnet assembly 300, first coil boundary 111, second coil boundary 112, first magnet boundary 310, second magnet boundary 320, first hollow portion 130, first coil inner boundary 131, second coil inner boundary 132, first permanent magnet 330, second permanent magnet 340, first magnet inner boundary 331, second magnet inner boundary 332, first coil arc surface 133, second coil arc surface 134, first magnet arc surface 333, second magnet arc surface 334, first reference line 135, second hollow portion 140, conductive point 150, conductive line 210, fixing seat 400, fixing plate 410, end cover 420, limiting groove 421, limiting rod 220. Detailed implementation method:

[0029] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] The present invention will now be described in more detail. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the invention. It should be noted that when an element is described as being "fixed to" another element, it can be directly on the other element, or one or more intermediate elements may exist between them. When an element is described as being "connected to" another element, it can be directly connected to the other element, or one or more intermediate elements may exist between them.

[0031] In the description of this invention, it should be noted that directional terms such as "front," "rear," "up," "down," "left," "right," "horizontal," "vertical," "horizontal," and "top," "bottom," etc., indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. These terms are used solely for the convenience of describing the invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the scope of protection of this invention. The directional terms "inner" and "outer" refer to the inner or outer contours of each component itself. In the description of this invention, it should be noted that the use of terms such as "first" and "second" to define components is merely for the convenience of distinguishing the corresponding components. Unless otherwise stated, these terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0032] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention.

[0033] Furthermore, the technical features involved in the different embodiments of this application described below can be combined with each other as long as they do not conflict with each other.

[0034] The preferred embodiments of the present invention will now be further described with reference to the accompanying drawings, such as... Figure 1 As shown, a moving-coil motor includes a rotor assembly 10 and a stator assembly 20. The rotor assembly 10 includes a base plate 100 and a rotating shaft 200 passing through the end face of the base plate 100. A first coil winding 110 and a second coil winding 120 are evenly distributed on both end faces of the base plate 100. The first coil winding 110 and the second coil winding 120 are symmetrically distributed with respect to the rotating shaft 200. The stator assembly 20 includes a permanent magnet assembly 300, which is suspended outside the first coil winding 110 and the second coil winding 120. When the first coil winding 110 and the second coil winding 120 are energized, the first coil winding 110 and the second coil winding 120 repeatedly deflect around the rotating shaft 200. The permanent magnet assembly 300 can cover both sides of the deflection range of the first coil winding 110 and the second coil winding 120.

[0035] In this embodiment, the rotating shaft 200 passes through the end face of the substrate 100 and is fixedly connected to the substrate 100. The substrate 100 can be a multilayer circuit board. A first coil winding 110 and a second coil winding 120 are respectively provided on the front and back end faces of the substrate 100, and the first coil winding 110 and the second coil winding 120 are symmetrically distributed with respect to the rotating shaft 200. A permanent magnet assembly 300 is suspended outside the first coil winding 110 and the second coil winding 120. In the working state of this embodiment, when the first coil winding 110 and the second coil winding 120 are simultaneously... When energized, the coil generates a magnetic field, which interacts with the magnetic field of the permanent magnet assembly 300, thereby driving the substrate 100 to deflect around the axis 200. During this process, the axis 200 also rotates synchronously. When the current direction of the first coil winding 110 and the second coil winding 120 is changed, the direction of the generated coil magnetic field will be opposite, thus generating an opposite interaction with the magnetic field of the permanent magnet assembly 300. Therefore, the substrate 100 is driven to deflect in the opposite direction around the axis 200, thereby causing the axis 200 to deflect repeatedly within a certain angle.

[0036] Compared to existing technologies, this application provides a permanent magnet group 300 outside the first coil winding 110 and the second coil winding 120. When the first coil winding 110 and the second coil winding 120 are energized, the permanent magnet group 300 can cover the deflection range of the first coil winding 110 and the second coil winding 120. In this way, the coil is always in a uniform magnetic field throughout the entire range of motion, and the generated Lorentz force is strictly proportional to the current, eliminating the need to compensate for the influence of nonlinear magnetic field distribution. In addition, the uniform magnetic field ensures that the acceleration of the coil is determined only by the current, without magnetic field gradient interference, resulting in faster and more stable dynamic response. Thus, under the same output force, the linear relationship of this application simplifies the control algorithm, enabling more precise displacement, speed, or force control, which is suitable for high-precision positioning (such as optical equipment and precision instruments). Furthermore, compared to existing technologies, this application provides magnets on both sides of the coil, which provides better magnetic field strength compared to providing magnets on only one side.

[0037] Furthermore, based on the above embodiments, in conjunction with 2, Figure 3 and Figure 4As shown, the first coil winding 110 and the second coil winding 120 are generally fan-shaped. A first coil boundary 111 and a second coil boundary 112 are formed on both sides along the length direction of the first coil winding 110 and the second coil winding 120. A first magnet boundary 310 and a second magnet boundary 320 are formed on both sides along the length direction of the permanent magnet assembly 300. When the substrate 100 is deflected, the first coil boundary 111 on one side of the rotating shaft 200 coincides with the first magnet boundary 310, and the second coil boundary 112 and the second magnet boundary 320 on the other side of the rotating shaft 200 coincide. In this way, when the first coil winding 110 and the second coil winding 120 are repeatedly deflected around the rotating shaft 200, the permanent magnet assembly 300 can cover the deflection range of the first coil winding 110 and the second coil winding 120.

[0038] Furthermore, based on the above embodiments, in conjunction with 2, Figure 3 and Figure 4 As shown, a first hollow portion 130 is formed in both the first coil winding 110 and the second coil winding 120. The first hollow portion 130 forms a first inner coil boundary 131 and a second inner coil boundary 132 within the first coil winding 110 and the second coil winding 120. The permanent magnet assembly 300 includes a first permanent magnet 330 and a second permanent magnet 340. The shapes of the first permanent magnet 330 and the second permanent magnet 340 are generally fan-shaped. The first magnet boundary 310 and the second magnet boundary 320 are respectively located outside the first permanent magnet 330 and the second permanent magnet 340. A first inner magnet boundary 331 and a second inner magnet boundary 332 are formed on the opposite inner sides of the first permanent magnet 330 and the second permanent magnet 340. 2. When the substrate 100 is deflected, the inner boundary 132 of the second coil on one side of the rotating shaft 200 coincides with the inner boundary 332 of the second magnet. The inner boundary 131 of the first coil and the inner boundary 332 of the second magnet are also coincided on the other side of the rotating shaft 200. Thus, when the first coil winding 110 and the second coil winding 120 are deflected, the coil portion between the inner boundary 131 of the first coil and the boundary 111 of the first coil will be within the coverage of the first permanent magnet 330, and the coil portion between the inner boundary 132 of the second coil and the boundary 112 of the second coil will be within the coverage of the second permanent magnet 340. This further improves the coverage of the deflection range of the first coil winding 110 and the second coil winding 120 by the permanent magnet assembly 300.

[0039] Preferably, combined with 2, Figure 3 and Figure 4As shown, within the first coil winding 110 and the second coil winding 120, the wiring pattern between the first coil boundary 111 and the first coil inner boundary 131, and between the second coil boundary 112 and the second coil inner boundary 132, is a straight line.

[0040] Furthermore, based on the above embodiments, combined with Figure 5 and Figure 6 As shown, a first coil arc surface 133 and a second coil arc surface 134 connect the inner boundary 131 of the first coil and the inner boundary 132 of the second coil. A first magnet arc surface 333 and a second magnet arc surface 334 also connect the first magnet boundary 310 and the inner boundary 331 of the first magnet, as well as the second magnet boundary 320 and the inner boundary 332 of the second magnet. The curvature and distance between the first coil arc surface 133 and the first magnet arc surface 333, and between the second coil arc surface 134 and the second magnet arc surface 334, are the same. Thus, when the substrate 100 rotates, the first permanent magnet 33... The portion of the 0 or second permanent magnet 340 completely overlaps with the first hollow portion 130. Thus, it can be seen that in this application, the interaction between the first coil winding 110 and the second coil winding 120 and the permanent magnet group 300 is only affected by the straight portion of the coil between the first coil boundary 111 and the first coil inner boundary 131, and the second coil boundary 112 and the second coil inner boundary 132. Therefore, compared with the prior art, the coil of this application is always in a more uniform magnetic field throughout the entire range of motion, thereby enabling more precise displacement, speed or force control, which is suitable for high-precision positioning.

[0041] Furthermore, based on the above embodiments, combined with Figure 5 and Figure 6 As shown, a first reference line 135 is provided in the middle between the inner boundary 131 and the inner boundary 132 of the first coil in the first hollowed-out portion 130. When the first coil winding 110 and the second coil winding 120 are not energized, the angle between the inner boundary 331 and the inner boundary 332 of the first magnet and the first reference line 135 is between 7 degrees and 7.5 degrees. Thus, when the inner boundary 131 and the inner boundary 132 of the first coil are energized and the substrate 100 begins to rotate, the first permanent magnet 330 and the second permanent magnet 340 can both... Sufficient space is provided within the first cutout portion 130 for swaying, thereby preventing the first permanent magnet 330 or the second permanent magnet 340 from crossing the boundary between the first coil and the inner boundary 131 of the first coil, as well as the boundary 112 and the inner boundary 132 of the second coil under the action of inertia. In addition, this angle can also avoid the problem that the gap between the first permanent magnet 330 and the second permanent magnet 340 in this application is too large, which would result in excessive instantaneous torque of the substrate 100 swaying and excessive inertia, making it impossible for the various boundaries mentioned above to coincide.

[0042] Furthermore, based on the above embodiments, combined with Figure 5 and Figure 6 As shown, a second hollow portion 140 is provided between the first coil winding 110 and the second coil winding 120. When the substrate 100 starts to sway, the first permanent magnet 330 and the second permanent magnet 340 can be partially suspended outside the second hollow portion 140. In this way, no matter whether the substrate 100 rotates clockwise or counterclockwise, the first permanent magnet 330 and the second permanent magnet 340 will be partially suspended, which can better avoid the influence of the nonlinear magnetic field of the permanent magnet on the excess coil portion, and thus better control the deflection of the substrate 100.

[0043] Furthermore, based on the above embodiments, combined with Figure 1 and Figure 7 As shown, the rotating shaft 200 has a hollow structure. Conductive points 150 are provided on the substrate 100. The conductive points 150 are connected to the first coil winding 110 and the second coil winding 120. Conductive lines 210 are provided inside the rotating shaft 200. The conductive lines 210 pass through the rotating shaft 200 and are electrically connected to the conductive points 150. In this way, when the first coil winding 110 and the second coil winding 120 are energized and drive the substrate 100 to rotate, the electrical connection between the conductive lines 210 and the substrate will not be affected during the synchronous rotation of the rotating shaft 200.

[0044] Furthermore, based on the above embodiments, combined with Figure 1 and Figure 7 As shown, a fixed base 400 is provided between the rotor assembly 10 and the stator assembly 20. The rotating shaft 200 passes through the fixed base 400 and can rotate within the fixed base 400. A fixed plate 410 is provided within the fixed base 400. The fixed plate 410 is arranged parallel to the base plate 100. The permanent magnet assembly 300 is fixed within the fixed plate 410, thereby suspending it outside the first coil winding 110 and the second coil winding 120.

[0045] Furthermore, based on the above embodiments, such as Figure 8 As shown, an end cap 420 is provided on one side of the fixed base 400, and the rotating shaft 200 passes through the end cap 420. A limiting groove 421 is provided in the end cap 420, and a limiting rod 220 is provided in the limiting groove 421. The limiting rod 220 is inserted into the rotating shaft 200 along the vertical direction of the rotating shaft 200. In this way, when the substrate 100 deflects, the limiting groove 421 and the limiting rod 220 cooperate with each other to limit the deflection angle of the substrate 100.

[0046] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

Claims

1. A moving-coil motor, characterized in that, The system includes a rotor assembly (10) and a stator assembly (20). The rotor assembly (10) includes a base plate (100) and a rotating shaft (200) passing through the end face of the base plate (100). The base plate (100) is composed of several layers of circuit boards. A first coil winding (110) and a second coil winding (120) are respectively provided on both sides of the base plate (100). The first coil winding (110) and the second coil winding (120) are symmetrically distributed with respect to the rotating shaft (200). The stator assembly (20) The system includes a permanent magnet assembly (300), which is suspended outside the first coil winding (110) and the second coil winding (120). When the first coil winding (110) and the second coil winding (120) are energized, the first coil winding (110) and the second coil winding repeatedly deflect around the axis (200). The permanent magnet assembly (300) can cover the deflection range on both sides of the first coil winding (110) and the second coil winding (120).

2. The moving-coil motor according to claim 1, characterized in that, The first coil winding (110) and the second coil winding (120) are generally fan-shaped. A first coil boundary (111) and a second coil boundary (112) are formed on both sides along the length direction of the first coil winding (110) and the second coil winding (120). A first magnet boundary (310) and a second magnet boundary (320) are formed on both sides along the length direction of the permanent magnet assembly (300). When the substrate (100) is deflected, the first coil boundary (111) on one side of the rotating shaft (200) coincides with the first magnet boundary (310), and the second coil boundary (112) and the second magnet boundary (320) on the other side of the rotating shaft (200) coincide.

3. The moving-coil motor according to claim 2, characterized in that, A first hollow portion (130) is formed in both the first coil winding (110) and the second coil winding (120). The first hollow portion (130) forms a first coil inner boundary (131) and a second coil inner boundary (132) in the first coil winding (110) and the second coil winding (120). The permanent magnet assembly (300) includes a first permanent magnet (330) and a second permanent magnet (340). The shapes of the first permanent magnet (330) and the second permanent magnet (340) are generally fan-shaped. The boundary of the first magnet (310) and the first permanent magnet (340) are... Two magnet boundaries (320) are respectively disposed on the outer sides of the first permanent magnet (330) and the second permanent magnet (340). A first magnet inner boundary (331) and a second magnet inner boundary (332) are formed on the inner sides of the first permanent magnet (330) and the second permanent magnet (340) respectively. When the substrate (100) is deflected, the inner boundary (132) of the second coil on one side of the rotating shaft (200) coincides with the inner boundary (332) of the second magnet, and the inner boundary (131) of the first coil and the inner boundary (332) of the second magnet coincide on the other side of the rotating shaft (200).

4. The moving-coil motor according to claim 3, characterized in that, Within the first coil winding (110) and the second coil winding (120), the wiring pattern between the first coil boundary (111) and the first coil inner boundary (131), as well as the second coil boundary (112) and the second coil inner boundary (132), is a straight line.

5. The moving-coil motor according to claim 3, characterized in that, The first coil inner boundary (131) and the second coil inner boundary (132) are connected by a first coil arc surface (133) and a second coil arc surface (134). The first magnet boundary (310) and the first magnet inner boundary (331) and the second magnet boundary (320) and the second magnet inner boundary (332) are both connected by a first magnet arc surface (333) and a second magnet arc surface (334). The arc and distance between the first coil arc surface (133) and the first magnet arc surface (333), and between the second coil arc surface (134) and the second magnet arc surface (334) are the same.

6. The moving-coil motor according to claim 3, characterized in that, A first reference line (135) is provided in the middle between the inner boundary (131) of the first coil and the inner boundary (132) of the second coil in the first hollow part (130). When the first coil winding (110) and the second coil winding (120) are not energized, the angle between the inner boundary (331) of the first magnet and the inner boundary (332) of the second magnet and the first reference line (135) is between 7 degrees and 7.5 degrees.

7. The moving-coil motor according to claim 3, characterized in that, A second hollow portion (140) is provided between the first coil winding (110) and the second coil winding (120). When the substrate (100) begins to sway, the first permanent magnet (330) and the second permanent magnet (340) can be partially suspended outside the second hollow portion (140).

8. The moving-coil motor according to claim 1, characterized in that, The rotating shaft (200) has a hollow structure. Conductive points (150) are provided on the substrate (100). The conductive points (150) are connected to the first coil winding (110) and the second coil winding (120). Conductive lines (210) are provided inside the rotating shaft (200). The conductive lines (210) pass through the rotating shaft (200) and are electrically connected to the conductive points (150).

9. The moving-coil motor according to claim 1, characterized in that, A fixed seat (400) is provided between the rotor assembly (10) and the stator assembly (20). The rotating shaft (200) passes through the fixed seat (400) and can rotate within the fixed seat (400). A fixed plate (410) is provided within the fixed seat (400). The fixed plate (410) is arranged parallel to the base plate (100). The permanent magnet assembly (300) is fixed within the fixed plate (410).

10. The moving-coil motor according to claim 9, characterized in that, An end cap (420) is provided on one side of the fixed base (400), and the rotating shaft (200) extends out from the end cap (420). A limiting groove (421) is provided in the end cap (420), and a limiting rod (220) is provided in the limiting groove (421). The limiting rod (220) is inserted into the rotating shaft (200) along the vertical direction of the rotating shaft (200).

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