Multi-cell moving coil motor
By employing a multi-unit structure and uniform magnetic field design in the moving-coil motor, the problem of controlling the winding in a non-uniform magnetic field is solved, achieving faster and more stable dynamic response and stronger torque, making it suitable for high-precision positioning.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHENZHEN ELIMAG INTELLIGENT TECHNOLOGY CO LTD
- Filing Date
- 2025-06-30
- Publication Date
- 2026-06-26
AI Technical Summary
Existing moving-coil motors cannot always be in a uniform magnetic field within the winding's range of motion, making precise displacement, speed, or force control difficult. Furthermore, the torque driven by a single-sided permanent magnet is insufficient, making it difficult to drive heavy loads.
It adopts a multi-unit structure, with first and second coil windings and permanent magnet groups set on both sides of the substrate. The permanent magnet groups cover the deflection range of the windings to form a uniform magnetic field, and multiple substrates are used to provide stronger torque.
It achieves a uniform magnetic field for the coil throughout its entire range of motion, resulting in faster and more stable dynamic response, precise control of displacement, speed, or force, and is suitable for high-precision positioning, while also providing greater torque.
Smart Images
Figure CN224418538U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of motors, specifically to a multi-unit 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 operates on a similar principle to the one described above. However, in the aforementioned patent, the permanent magnet cannot completely cover the winding during rotation. Therefore, the entire coil cannot remain in a uniform magnetic field throughout its entire range of motion. Consequently, under magnetic field gradient interference, it is impossible to achieve more precise displacement, speed, or force control over the winding's rotation. Furthermore, in the above solution, the combination of the winding and the permanent magnet consists of only one unit, resulting in relatively low torque during magnetic field driving, making it unable to drive heavy loads. Utility Model Content
[0004] To address the aforementioned issues, this application provides a multi-unit moving-coil motor, comprising at least two parallel base plates and a rotating shaft passing through the end faces of the base plates. A first coil winding and a second coil winding are evenly distributed on both end faces of the base plates, and the first coil winding and the second coil winding are symmetrically distributed with respect to the rotating shaft. A first permanent magnet group and a second permanent magnet group are provided on both end faces of the base plates, and the first permanent magnet group and the second permanent magnet group are both suspended outside the first coil winding and the second coil winding. A fixing plate is provided on the side of the first permanent magnet group and the second permanent magnet group away from the base plates, and the first permanent magnet group and the second permanent magnet group are both fixed on the fixing plate.
[0005] Furthermore, adjacent substrates share a common fixing plate, and the first permanent magnet group and the second permanent magnet group each contain two permanent magnets, which are respectively fixed on both sides of the fixing plate.
[0006] Furthermore, the substrate includes at least one rigid plate, the rotating shaft has a hollow structure, conductive points are provided on the substrate, the conductive points are respectively connected to the first coil winding and the second coil winding, and conductive wires are provided inside the rotating shaft, the conductive wires pass through the rotating shaft and are electrically connected to the conductive points.
[0007] Furthermore, the overall shape of the first coil winding, the second coil winding, and their permanent magnets are all fan-shaped. A first coil boundary and a second coil boundary are formed on both sides along the length direction of the first coil winding and the second coil winding. A first magnet boundary and a second magnet boundary are formed on both sides along the length direction of the first permanent magnet group and the second permanent magnet group. 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.
[0008] 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. A first inner boundary and a second inner boundary of the magnet are formed on the opposite inner side between the permanent magnets of the first permanent magnet group and the second permanent magnet group. When the substrate is deflected, the second inner boundary of the coil on one side of the rotating shaft coincides with the second inner boundary of the magnet, and the first inner boundary of the coil and the second inner boundary of the magnet coincide on the opposite side of the rotating shaft.
[0009] 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.
[0010] Furthermore, a fixed base is provided between the first permanent magnet group and the second permanent magnet group, the rotating shaft passes through the fixed base and can rotate within the fixed base, and the fixing plate is installed within the fixed base.
[0011] 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.
[0012] Compared with the prior art, the beneficial effects of this utility model are:
[0013] Compared with the prior art:
[0014] 1. 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 simplifies the control algorithm, enabling more precise displacement, velocity, or force control, making it suitable for high-precision positioning (such as optical equipment and precision instruments).
[0015] 2. Secondly, compared with the prior art, this application provides magnets on both sides of the coil, which provides a better magnetic field strength than providing magnets on only one side.
[0016] 3. Finally, by arranging multiple substrates in parallel, this application can provide a stronger torque to the shaft compared to a single substrate.
[0017] Additional aspects and advantages of this 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 this utility model 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 utility model. 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 this utility model;
[0020] Figure 2 This diagram shows the positional relationship between the substrate, the first permanent magnet group, and the second permanent magnet group in the initial state of this utility model.
[0021] Figure 3 This is a schematic diagram of the structure of the fixing base of this utility model;
[0022] Figure 4 This is a diagram showing the positional relationship between the permanent magnet and the first hollowed-out part in the initial state of this utility model;
[0023] Figure 5 This is a schematic diagram of the end cap structure of this utility model.
[0024] The reference numerals and names in the figure are as follows:
[0025] Substrate 100, rotating shaft 200, first coil winding 110, second coil winding 120, first permanent magnet group 10, second permanent magnet group 20, permanent magnet 11, first coil boundary 111, second coil boundary 112, first magnet boundary 310, second magnet boundary 320, first hollow part 130, first coil inner boundary 131, second coil inner boundary 132, 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, conductive point 150, conductive wire 210, fixing base 400, fixing plate 410, end cap 420, limiting groove 421, limiting rod 220. Detailed Implementation
[0026] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.
[0027] 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 scope of 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.
[0028] In the description of this utility model, it should be noted that directional terms such as "front, back, up, down, left, right," "horizontal, vertical, horizontal," and "top, bottom," indicating directions or positional relationships, are generally based on the directions or positional relationships shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or component 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 utility model. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself. In the description of this utility model, 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, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this utility model. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly specified.
[0029] 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 scope of the invention.
[0030] 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.
[0031] The preferred embodiments of this utility model will now be further described with reference to the accompanying drawings, such as... Figure 1 As shown, a multi-unit moving-coil motor includes at least two parallel base plates 100 and a rotating shaft 200 passing through the end face of the base plates 100. A first coil winding 110 and a second coil winding 120 are evenly distributed on both end faces of the base plates 100, symmetrically distributed with respect to the rotating shaft 200. A first permanent magnet assembly 10 and a second permanent magnet assembly 20 are provided on both end faces of the base plates 100, both suspended from the first coil winding 110 and the second coil winding 200. On the outer side of 120, a fixing plate 410 is provided on the side of the first permanent magnet group 10 and the second permanent magnet group 20 away from the substrate 100. The first permanent magnet group 10 and the second permanent magnet group 20 are both fixed in the fixing plate 410. 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 axis 200. The first permanent magnet group 10 and the second permanent magnet group 20 can respectively cover the deflection range of the first coil winding 110 and the second coil winding 120.
[0032] In this embodiment, the rotating shaft 200 passes through the end face of the substrate 100 and is fixedly connected to the substrate 100. A first coil winding 110 and a second coil winding 120 are respectively disposed on the positive and negative 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 first permanent magnet assembly 10 and a second permanent magnet assembly 20 are 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 energized, a coil magnetic field is generated. The magnetic field of the coil interacts with the magnetic fields of the first permanent magnet group 10 and the second permanent magnet group 20, 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 magnetic field of the coil generated will be opposite, thus generating an opposite interaction with the magnetic fields of the first permanent magnet group 10 and the second permanent magnet group 20. 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.
[0033] This application provides a permanent magnet group outside the first coil winding 110 and the second coil winding 120. When the first coil winding 110 and the second coil are energized, the permanent magnet group covers the deflection range of the first coil winding 110 and the second coil winding 120. This ensures the coil is always in a uniform magnetic field throughout its 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. Furthermore, the uniform magnetic field ensures that the coil's acceleration is determined solely by the current, without magnetic field gradient interference, resulting in faster and more stable dynamic response. Therefore, under the same output force, the linear relationship simplifies the control algorithm, enabling more precise displacement, velocity, or force control, suitable for high-precision positioning (such as optical equipment and precision instruments). Secondly, compared to existing technologies, this application provides magnets on both sides of the coil, resulting in a better magnetic field strength compared to a single-sided magnet. Finally, by arranging multiple substrates 100 in parallel, this application can provide a stronger torque to the rotating shaft 200 compared to a single substrate 100.
[0034] Furthermore, based on the above embodiments, such as Figure 1 As shown, adjacent substrates 100 share a common fixing plate 410. The first permanent magnet group 10 and the second permanent magnet group 20 each contain two permanent magnets 11. The permanent magnets 11 are fixed on both sides of the fixing plate 410, which saves more space while achieving the effect of multiple units.
[0035] Furthermore, based on the above embodiments, combined with Figure 1 and Figure 3 As shown, the substrate 100 includes at least one rigid board, which includes a PCB circuit board or other board material that can be used for imprinting wiring. The first coil winding 110 and the second coil winding 120 are arranged in parallel or in series on the substrate 100. The rotating shaft 200 has a hollow structure. Conductive points 150 are provided on the substrate 100. The conductive points 150 are respectively connected to the first coil winding 110 and the second coil winding 120. A conductive line 210 is provided in the rotating shaft 200. The conductive line 210 passes through the rotating shaft 200 and is 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 line 210 and the substrate will not be affected during the synchronous rotation of the rotating shaft 200.
[0036] Furthermore, based on the above embodiments, such as Figure 2 As shown, the first coil winding 110 and the second coil winding 120, as well as their permanent magnets 11, are all fan-shaped. A first coil boundary 111 and a second coil boundary 112 are formed on both sides of 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 of the length direction of the first permanent magnet group 10 and the second permanent magnet group 20. 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 are repeatedly deflected around the rotating shaft 200, the first permanent magnet group 10 and the second permanent magnet group 20 can respectively cover the deflection range of the first coil winding 110 and the second coil.
[0037] Furthermore, based on the above embodiments, such as Figure 2 and Figure 4As 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 coil inner boundary 131 and a second coil inner boundary 132 within the first coil winding 110 and the second coil winding 120. A first magnet inner boundary 331 and a second magnet inner boundary 332 are formed on the opposite inner sides between the permanent magnets of the first permanent magnet group 10 and the second permanent magnet group 20. When the substrate 100 is deflected, the second coil inner boundary 132 and the second magnet inner boundary 332 on one side of the rotating shaft 200... The rotating shaft 200 coincides with the inner boundary 131 of the first coil and the inner boundary 332 of the second magnet on the other side. In this way, when the first coil winding 110 and the second coil deflect, 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 group 10, 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 group 20. This further improves the coverage of the permanent magnet group over the deflection range of the first coil winding 110 and the second coil.
[0038] Furthermore, based on the above embodiments, such as Figure 2 and Figure 4 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... Part of the permanent magnet assembly 10 or the second permanent magnet assembly 20 completely overlaps with the first hollowed-out 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 assembly is only affected by the straight section of the coil between the outer edge of the first coil and the inner boundary 131 of the first coil, and between the outer edge of the second coil and the inner boundary 132 of the second coil. 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, and is suitable for high-precision positioning.
[0039] Furthermore, based on the above embodiments, combined with Figure 2 and Figure 5As shown, a fixing seat 400 is provided between the substrate 100, the first permanent magnet group 10, and the second permanent magnet group 20. The rotating shaft 200 passes through the fixing seat 400 and can rotate within the fixing seat 400. The fixing plate 410 is installed in the fixing seat 400.
[0040] Furthermore, based on the above embodiments, combined with Figure 2 and Figure 5 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.
[0041] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this 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 this invention.
Claims
1. A multi-unit moving-coil motor, characterized in that, The system includes at least two parallel substrates (100) and a rotating shaft (200) passing through the end face of the substrates (100). A first coil winding (110) and a second coil winding (120) are evenly distributed on the two end faces of the substrates (100). The first coil winding (110) and the second coil winding (120) are symmetrically distributed with respect to the rotating shaft (200). A first permanent magnet group (10) and a second permanent magnet group (20) are provided on the two end faces of the substrates (100). The first permanent magnet group (10) and the second permanent magnet group (20) are suspended outside the first coil winding (110) and the second coil winding (120). A fixing plate (410) is provided on the side of the first permanent magnet group (10) and the second permanent magnet group (20) away from the substrates (100). The first permanent magnet group (10) and the second permanent magnet group (20) are fixed on the fixing plate (410).
2. The multi-unit moving-coil motor according to claim 1, characterized in that, The adjacent substrates (100) share a common fixing plate (410). The first permanent magnet group (10) and the second permanent magnet group (20) each contain two permanent magnets (11), which are respectively fixed on both sides of the fixing plate (410).
3. The multi-unit moving-coil motor according to claim 2, characterized in that, The substrate (100) includes at least one rigid plate. The rotating shaft (200) has a hollow structure. Conductive points (150) are provided on the substrate (100). The conductive points (150) are respectively 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).
4. The multi-unit moving-coil motor according to claim 2, characterized in that, The first coil winding (110) and the second coil winding (120) and their permanent magnets (11) are all 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 first permanent magnet group (10) and the second permanent magnet group (20). 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.
5. The multi-unit moving-coil motor according to claim 4, 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). A first magnet inner boundary (331) and a second magnet inner boundary (332) are formed on the inner side opposite to the permanent magnets of the first permanent magnet group (10) and the second permanent magnet group (20). When the substrate (100) is deflected, the second coil inner boundary (132) on one side of the rotating shaft (200) coincides with the second magnet inner boundary (332), and the first coil inner boundary (131) and the second magnet inner boundary (332) on the other side of the rotating shaft (200) coincide.
6. The multi-unit moving-coil motor according to claim 5, 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.
7. The multi-unit moving-coil motor according to claim 2, characterized in that, A fixed seat (400) is provided between the first permanent magnet group (10) and the second permanent magnet group (20). The rotating shaft (200) passes through the fixed seat (400) and can rotate within the fixed seat (400). The fixed plate (410) is installed inside the fixed seat (400).
8. The multi-unit moving-coil motor according to claim 7, 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).