Electronic device and magnetic rotating mechanism thereof

Abstract

Embodiments of the present application disclose an electronic device and a magnetic rotating mechanism thereof, and relate to the technical field of communication. The magnetic rotating mechanism comprises a rotating shaft, a shaft cylinder, a permanent magnet and a magnetic conducting piece. The shaft cylinder is sleeved on the rotating shaft. At least one of the outer circumferential surface of the shaft cylinder facing the rotating shaft and the inner wall surface of the rotating shaft facing the shaft cylinder is provided with the permanent magnet. The permanent magnet comprises a plurality of magnetic pole portions. The magnetic conducting piece is located in an annular space between the rotating shaft and the shaft cylinder. The magnetic conducting piece comprises at least one magnetic conducting portion. At least part of the magnetic conducting portions correspond to at least one magnetic pole portion respectively. Each magnetic conducting portion is used for inducting a magnetic pole opposite to the corresponding magnetic pole portion, so that the magnetic conducting portion and the corresponding magnetic pole portion interact, and the relative rotation of the shaft cylinder and the rotating shaft is realized. The electronic device comprises the magnetic rotating mechanism, a first device main body and a second device main body. The first device main body is connected with the rotating shaft. The second device main body is connected with the shaft cylinder. The first device main body and the second device main body realize relative rotation through the magnetic rotating mechanism.

Description

Technical Field

[0001] This application belongs to the field of communication technology, specifically relating to an electronic device and its magnetic rotation mechanism. Background Technology

[0002] In the field of electronic devices, many electronic devices are equipped with displays and magnetic rotation mechanisms. These mechanisms drive the displays to rotate, satisfying users' needs for both landscape and portrait viewing and expanding the functionality of the electronic devices. Similarly, other components of electronic devices that require rotation, such as knobs, can also be driven by magnetic rotation mechanisms to achieve rotational movements.

[0003] In related technologies, a magnetic rotation mechanism includes a rotating shaft, a shaft cylinder, a first permanent magnet, and a second permanent magnet. The shaft cylinder is fitted around the outside of the rotating shaft. The first permanent magnet is disposed on the circumferential surface of the rotating shaft, and the second permanent magnet is disposed on the inner wall surface of the shaft cylinder. The first and second permanent magnets are alternately arranged with N and S poles on the circumferential direction of the rotating shaft, respectively, and are positioned opposite each other. The magnetic force between the first and second permanent magnets drives the rotating shaft and shaft cylinder to rotate relative to each other. However, this magnetic rotation mechanism is prone to magnetic field leakage to the outside, resulting in a high risk of magnetic leakage and poor rotational stability. Summary of the Invention

[0004] The purpose of this application is to provide an electronic device and its magnetic rotation mechanism, which can solve the problem of poor rotational stability caused by the high risk of magnetic leakage in related technologies.

[0005] In a first aspect, embodiments of this application provide a magnetic rotation mechanism, including a rotating shaft, a shaft cylinder, a permanent magnet, and a magnetic conductive component. The shaft cylinder is sleeved on the rotating shaft. The permanent magnet is provided on at least one of the outer peripheral surface of the rotating shaft facing the shaft cylinder and the inner wall surface of the shaft cylinder facing the rotating shaft. The permanent magnet includes a plurality of magnetic pole portions. The magnetic guide is located in the annular space between the rotating shaft and the shaft cylinder. The magnetic guide includes at least one magnetic guide portion, and at least a portion of the magnetic guide portion corresponds to at least one magnetic pole portion. Each magnetic guide portion is used to induce a magnetic pole opposite to the corresponding magnetic pole portion, so that the magnetic guide portion interacts with the corresponding magnetic pole portion to realize the relative rotation of the shaft cylinder and the rotating shaft.

[0006] Secondly, embodiments of this application also provide an electronic device, including the aforementioned magnetic rotation mechanism, a first device body, and a second device body. The first device body is connected to the rotating shaft, and the second device body is connected to the shaft cylinder. The first device body and the second device body achieve relative rotation through the magnetic rotation mechanism.

[0007] In this embodiment, at least one of the rotating shaft and the cylinder of the magnetic rotation mechanism is provided with a permanent magnet and an additional magnetic guide is provided. The magnetic guide part of the magnetic guide part induces a magnetic pole opposite to the corresponding magnetic pole part, so that the magnetic guide part participates in modulating the magnetic field of the magnetic rotation mechanism. That is to say, the magnetic guide part replaces the original permanent magnet structure opposite to the magnetic pole part. Therefore, there is no need to set a permanent magnet structure opposite to the magnetic pole part, which is beneficial to reduce the volume of the permanent magnet structure, reduce the amount of permanent magnet structure used, reduce processing costs, reduce the risk of magnetic leakage, and is less likely to leak magnetic field to the outside, which is beneficial to improve rotational stability. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of the structure of the magnetic rotation mechanism disclosed in the first embodiment of this application; Figure 2 This is a schematic diagram of the magnetization direction of the permanent magnets arranged in the shaft cylinder of the magnetic rotation mechanism disclosed in the first embodiment of this application; Figure 3 This is a schematic diagram of the torque during one relative rotation of the shaft and the cylinder as disclosed in the embodiments of this application; Figure 4 This is a torque diagram showing the first magnetic protrusion disclosed in the embodiments of this application under different center angles; Figure 5 This is a schematic diagram showing how the torque of the magnetic rotation mechanism disclosed in the embodiments of this application changes with the ratio of the central angle α corresponding to the first magnetic protrusion to 180° / P; Figure 6 This is a schematic diagram of the structure of the electronic device corresponding to the first embodiment of this application; Figure 7 This is a partial structural schematic diagram of the electronic device corresponding to the first embodiment of this application; Figure 8 This is a schematic diagram of the magnetic rotation mechanism in the case where the first magnetic protrusion and the rotating shaft are an integral structure as disclosed in the first embodiment of this application; Figure 9 This is a schematic diagram of the magnetic rotation mechanism in the case where there are two first magnetic protrusions as disclosed in the first embodiment of this application; Figure 10 This is a schematic diagram of the magnetic rotation mechanism disclosed in the second embodiment of this application; Figure 11 This is a schematic diagram showing the change in the ratio of the size of the magnetic pole portion and the second magnetic protrusion in the direction surrounding the rotating shaft, as disclosed in the embodiments of this application. Figure 12 This is a schematic diagram of the magnetic rotation mechanism disclosed in the third embodiment of this application; Figure 13 This is a schematic diagram of the magnetic rotation mechanism disclosed in the fourth embodiment of this application; Figure 14 This is a schematic diagram of the electronic device corresponding to the fourth embodiment of this application; Figure 15 This is a partial structural schematic diagram of the electronic device corresponding to the fourth embodiment of this application; Figure 16 This is a second schematic diagram of the structure of the electronic device disclosed in the embodiments of this application; Figure 17 This is the second schematic diagram of the structure of the electronic device disclosed in the embodiments of this application.

[0009] Explanation of reference numerals in the attached figures: 10-Magnetic Rotation Mechanism 100 - Shaft, 110 - Shaft end protrusion 200-shaft cylinder, 300-Magnetic Conductor 310 - First magnetic conductive element, 311 - First magnetic conductive protrusion, 312 - First magnetic conductive cylinder section 320 - Second magnetic conductor, 321 - Second magnetic protrusion, 330 - Third magnetic conductive element, 331 - Third magnetic conductive protrusion, 332 - Second magnetic conductive cylinder section a-First gap, 400 - Permanent magnet, 410 - First permanent magnet, 420 - Second permanent magnet, 401 - Magnetic pole section 500-Support Sleeve 600-ring, 20 - First equipment body, 30 - Second equipment body. Detailed Implementation

[0010] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0011] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0012] The electronic device and its magnetic rotation mechanism provided in this application will be described in detail below with reference to the accompanying drawings, through specific embodiments and application scenarios.

[0013] Please refer to Figures 1 to 17 As shown, the magnetic rotation mechanism 10 is applied to electronic devices to enable relative rotation between different main bodies of the electronic device by means of magnetic force.

[0014] The magnetic rotation mechanism 10 includes a rotating shaft 100, a shaft cylinder 200, a permanent magnet 400, and a magnetic conductor 300. The rotating shaft 100 serves as the support center for the other structures of the magnetic rotation mechanism 10. The rotating shaft 100 can be a solid shaft or a hollow shaft. The shaft cylinder 200 is sleeved on the rotating shaft 100, that is, the shaft cylinder 200 is sleeved on the periphery of the rotating shaft 100. The shaft cylinder 200 can be understood as a hollow shaft. The inner wall surface of the shaft cylinder 200 is not in direct contact with the surface of the rotating shaft 100. The two are rotated together by the permanent magnet 400 and the magnetic conductor 300, so that the shaft cylinder 200 and the rotating shaft 100 can rotate relative to each other around the axis of the rotating shaft 100.

[0015] At least one of the outer peripheral surface of the rotating shaft 100 facing the shaft cylinder 200 and the inner wall surface of the shaft cylinder 200 facing the rotating shaft 100 is provided with a permanent magnet 400. That is, the permanent magnet 400 can be provided only on the outer peripheral surface of the rotating shaft 100 facing the shaft cylinder 200 (see reference). Figure 1 and Figure 10 (As shown), the permanent magnet 400 can be provided only on the inner wall surface of the shaft cylinder 200 facing the rotating shaft 100, or the permanent magnet 400 can be provided on both the outer peripheral surface of the rotating shaft 100 facing the shaft cylinder 200 and the inner wall surface of the shaft cylinder 200 facing the rotating shaft 100 (see reference). Figure 12 and Figure 13 (As shown). Optionally, the permanent magnet 400 and the rotating shaft 100 facing the outer peripheral surface of the shaft cylinder 200, or the permanent magnet 400 and the rotating shaft cylinder 200 facing the inner wall surface of the rotating shaft 100, can be fixedly connected by welding, bonding or other methods.

[0016] The permanent magnet 400 includes a plurality of magnetic pole portions 401. Optionally, the permanent magnet 400 disposed on the outer peripheral surface of the rotating shaft 100 toward the shaft cylinder 200 or the inner wall surface of the shaft cylinder 200 toward the rotating shaft 100 can be a permanent magnet ring with a plurality of magnetic pole portions 401 arranged alternately with N poles and S poles along its circumference. Alternatively, the permanent magnet 400 may include a plurality of magnetic blocks arranged at intervals along the circumference of the rotating shaft 100, each magnetic block being a magnetic pole portion 401, and the magnetic poles of two adjacent magnetic blocks being opposite. The embodiments of this application do not limit the structure of the permanent magnet 400.

[0017] The magnetic conductor 300 is located within the annular space between the rotating shaft 100 and the shaft cylinder 200. Optionally, the magnetic conductor 300 can be connected to either the rotating shaft 100 or the shaft cylinder 200. Further optionally, refer to... Figure 1 , Figure 8 and Figure 9 As shown, the magnetic guide 300 is disposed on the inner wall surface of the shaft cylinder 200 facing the rotating shaft 100; or, refer to Figure 10 and Figure 12 As shown, a portion of the magnetic conductive element 300 is connected to the outer peripheral surface of the rotating shaft 100 facing the shaft cylinder 200, and another portion of the magnetic conductive element 300 is connected to the inner wall surface of the shaft cylinder 200 facing the rotating shaft 100; or, refer to Figure 13 As shown, the magnetic conductor 300 is located between the rotating shaft 100 and the shaft cylinder 200. The magnetic conductor 300 is neither connected to the rotating shaft 100 nor to the shaft cylinder 200, that is, the magnetic conductor is not in contact with the rotating shaft 100 and the shaft cylinder 200.

[0018] The magnetic conductive element 300 includes at least one magnetic conductive portion, and the number of magnetic conductive portions can be one or more. At least a portion of the magnetic conductive portion corresponds to at least one magnetic pole portion 401. Optionally, refer to Figure 10 As shown, only a portion of the magnetically conductive part may correspond to at least one magnetic pole part 401 to induce a magnetic pole opposite to the corresponding magnetic pole part 401, while another portion of the magnetically conductive part may correspond to the magnetically conductive part to induce a magnetic pole opposite to the corresponding magnetically conductive part; or, refer to Figure 1 , Figure 8 , Figure 9 , Figure 12 as well as Figure 13 As shown, each of the magnetically conductive parts can correspond to at least one magnetic pole part 401. Each magnetically conductive part is used to induce a magnetic pole opposite to the corresponding magnetic pole part 401, so that the magnetically conductive part interacts with the corresponding magnetic pole part 401, thereby realizing the relative rotation of the shaft cylinder 200 and the rotating shaft 100.

[0019] It should be noted that "induction" refers to the magnetic pole carried by the magnetically conductive part due to induction during the relative rotation of the shaft cylinder 200 and the rotating shaft 100. Therefore, each magnetically conductive part does not correspond to a fixed magnetic pole part 401. During the relative rotation of the shaft cylinder 200 and the rotating shaft 100, the relative position of the magnetically conductive part and the magnetic pole part 401 also changes. Each magnetically conductive part will sequentially approach different magnetic pole parts 401, thus each magnetically conductive part sequentially corresponds to different magnetic pole parts 401 to sequentially induce a magnetic pole opposite to the corresponding magnetic pole part 401. Therefore, the magnetic pole induced by each magnetically conductive part also changes and is not a fixed polarity magnetic pole.

[0020] In addition, the magnetic rotation mechanism 10 cannot directly switch from the state where the shaft cylinder 200 and the rotating shaft 100 are relatively fixed to the state where the shaft cylinder 200 and the rotating shaft 100 are relatively rotating by magnetic force. In the initial state, an external force is required to drive the shaft cylinder 200 to rotate relative to the rotating shaft 100, and then the magnetic force between the magnetic conductive part and the corresponding magnetic pole part 401 is used to make the shaft cylinder 200 and the rotating shaft 100 continue to rotate relative to each other.

[0021] Optionally, the number of magnetic conductive elements 300 can be one or more, and each magnetic conductive element 300 can be an integral structure or a split structure. The embodiments of this application do not limit the structure of the magnetic conductive element 300. The magnetic conductive element 300 can be made of soft magnetic material with high magnetic permeability. Of course, the magnetic conductive element 300 can also be made of other types of magnetic conductive materials.

[0022] In this embodiment, at least one of the rotating shaft 100 and the shaft cylinder 200 of the magnetic rotation mechanism 10 is provided with a permanent magnet 400, and a magnetic conductive element 300 is added. The magnetic conductive part of the magnetic conductive element 300 induces a magnetic pole opposite to the corresponding magnetic pole part 401, so that the magnetic conductive part participates in modulating the magnetic field of the magnetic rotation mechanism 10. That is to say, the magnetic conductive part replaces the original permanent magnet structure opposite to the magnetic pole part 401. Therefore, there is no need to set a permanent magnet structure opposite to the magnetic pole part 401, which is beneficial to reduce the volume of the permanent magnet structure, reduce the amount of permanent magnet structure used, reduce processing costs, reduce the risk of magnetic leakage, and prevent the magnetic field from leaking to the outside, which is beneficial to improve rotational stability.

[0023] In an optional embodiment, refer to Figure 7 and Figure 15 As shown, the end of the rotating shaft 100 is provided with a shaft end protrusion 110, which can be an annular structure. The magnetic conductive element 300 and the shaft end protrusion 110 are engaged in an axial upper limit fit with the rotating shaft 100. The shaft cylinder 200 includes a cylindrical portion, which is sleeved around the magnetic conductive element 300 and the rotating shaft 100. Moreover, the magnetic rotation mechanism 10 also includes a retaining ring 600, which is disposed on the side of the shaft cylinder 200 opposite to the magnetic conductive element 300. The retaining ring 600 and the shaft cylinder 200 are engaged in an axial upper limit fit with the rotating shaft 100 to prevent the shaft cylinder 200 from disengaging from the rotating shaft 100 and to ensure that the shaft cylinder 200 and the rotating shaft 100 continue to rotate relative to each other under the action of magnetic force.

[0024] In one optional embodiment, the magnetic guide 300 includes a first magnetic guide protrusion 311. A permanent magnet 400 is provided on one of the outer peripheral surface of the rotating shaft 100 facing the shaft cylinder 200 and the inner wall surface of the shaft cylinder 200 facing the rotating shaft 100, and the first magnetic guide protrusion 311 is provided on the other. The number of first magnetic guide protrusions 311 can be one or more. Specifically, refer to... Figure 1As shown, a permanent magnet 400 is provided on the inner wall surface of the shaft cylinder 200 facing the rotating shaft 100, and a first magnetically conductive protrusion 311 is provided on the outer peripheral surface of the rotating shaft 100 facing the shaft cylinder 200; or, a first magnetically conductive protrusion 311 is provided on the inner wall surface of the shaft cylinder 200 facing the rotating shaft 100, and a permanent magnet 400 is provided on the outer peripheral surface of the rotating shaft 100 facing the shaft cylinder 200.

[0025] The first magnetically conductive protrusion 311 is the aforementioned magnetically conductive part. It is used to induce a magnetic pole opposite to the corresponding magnetic pole part 401. The first magnetically conductive protrusion 311 protrudes towards the side where the permanent magnet 400 is located. That is, when the rotating shaft 100 is provided with the first magnetically conductive protrusion 311, the first magnetically conductive protrusion 311 protrudes towards the side where the shaft cylinder 200 is located (i.e., away from the axis of the rotating shaft 100); when the shaft cylinder 200 is connected with the first magnetically conductive protrusion 311, the first magnetically conductive protrusion 311 protrudes towards the side where the rotating shaft 100 is located (i.e., closer to the axis of the rotating shaft 100).

[0026] Optionally, the permanent magnet 400 has a ring-shaped structure and includes four magnetic pole portions 401, with two pairs of magnetic poles. (Refer to...) Figure 1 As shown, there can be four first magnetically conductive protrusions 311. These protrusions 311 are evenly distributed circumferentially around the rotating shaft 100. The shapes of each first magnetically conductive protrusion 311 can be the same or different. Each first magnetically conductive protrusion 311 corresponds one-to-one with a magnetic pole portion 401. Alternatively, refer to... Figure 9 As shown, there can be two first magnetically conductive protrusions 311, each corresponding to one of the two magnetic pole portions 401; or, there can be one first magnetically conductive protrusion 311, which may correspond to only one of the magnetic pole portions 401. In short, the number of first magnetically conductive protrusions 311 is an approximation of the number of magnetic pole portions 401. Therefore, each first magnetically conductive protrusion 311 can correspond to one magnetic pole portion 401, thereby inducing a magnetic pole opposite to that of the corresponding magnetic pole portion 401. This generates a magnetic force between the corresponding first magnetically conductive protrusion 311 and the magnetic pole portion 401, thereby driving the rotating shaft 100 and the shaft cylinder 200 to rotate relative to each other.

[0027] Of course, the number of magnetic pole portions 401 of the permanent magnet 400 can also be other numbers. Based on the number of magnetic pole portions 401, an appropriate number of first magnetic protrusions 311 are provided. The permanent magnet 400 can also be a structure other than a ring structure.

[0028] In this embodiment, a first magnetically conductive protrusion 311 is provided on the outer peripheral surface of the rotating shaft 100 facing the shaft cylinder 200 or on the inner wall surface of the shaft cylinder 200 facing the rotating shaft 100. The outer peripheral surface of the rotating shaft 100 facing the shaft cylinder 200 or the inner wall surface of the shaft cylinder 200 facing the rotating shaft 100 does not need to be provided with a permanent magnet structure opposite to the magnetic pole of the permanent magnet 400's magnetic pole portion 401. This is beneficial to reduce the volume of the permanent magnet structure, reduce the amount of permanent magnet structure used, reduce processing costs, reduce the risk of magnetic leakage, prevent magnetic field leakage to the outside, and improve rotational stability.

[0029] Furthermore, the first magnetically conductive protrusion 311 and the magnetic pole portion 401 of the permanent magnet 400 can be radially opposite each other on the rotating shaft 100. Since the radial gap between the rotating shaft 100 and the shaft cylinder 200 is small, the radial gap between the first magnetically conductive protrusion 311 and the magnetic pole portion 401 is also small. The distance between the first magnetically conductive protrusion 311 and the corresponding magnetic pole portion 401 is small, which is more conducive to the first magnetically conductive protrusion 311 inducing a magnetic pole opposite to the corresponding magnetic pole portion 401. It is also conducive to increasing the magnetic force between the first magnetically conductive protrusion 311 and the magnetic pole portion 401, which is more conducive to the smooth relative rotation of the shaft cylinder 200 and the rotating shaft 100.

[0030] In a further embodiment, the magnetic conductive element 300 includes a first magnetic conductive element 310, which includes at least one first magnetically conductive protrusion 311, as referenced. Figure 1 As shown, the first magnetic conductive element 310 may further include a first magnetic conductive cylinder portion 312. The first magnetic conductive element 310 is connected to the outer peripheral surface of the rotating shaft 100 facing the shaft cylinder 200. The first magnetic conductive cylinder portion 312 is sleeved on the outside of the rotating shaft 100. The first magnetic conductive protrusion 311 is disposed on the outer wall surface of the first magnetic conductive cylinder portion 312. Alternatively, the first magnetic conductive element 310 is connected to the inner wall surface of the shaft cylinder 200 facing the rotating shaft 100. The first magnetic conductive cylinder portion 312 is disposed on the inner wall surface of the shaft cylinder 200 facing the rotating shaft 100. The first magnetic conductive protrusion 311 is disposed on the inner wall surface of the first magnetic conductive cylinder portion 312.

[0031] Optionally, the first magnetic cylinder portion 312 and the first magnetic protrusion 311 can be an integral structure, or they can be separate structures.

[0032] In this embodiment, a first magnetically conductive cylinder 312 is added, which is used to connect the rotating shaft 100 or the shaft cylinder 200. This increases the connection area between the first magnetically conductive protrusion 311 and the rotating shaft 100 or the shaft cylinder 200, thereby improving the connection stability and rotational stability.

[0033] Of course, in other embodiments, the first magnetic guide 310 may not have the first magnetic guide cylinder 312, and the first magnetic guide protrusion 311 may be directly provided on the outer peripheral surface of the rotating shaft 100 facing the shaft cylinder 200 or the inner wall surface of the shaft cylinder 200 facing the rotating shaft 100.

[0034] In this embodiment, the permanent magnet 400 is connected to the inner wall surface of the shaft cylinder 200 facing the rotating shaft 100. A first magnetically conductive protrusion 311 is provided on the outer peripheral surface of the rotating shaft 100 facing the shaft cylinder 200. The permanent magnet 400 has a ring-shaped structure, and its magnetization direction is anisotropic internal magnetization, with the magnetization direction referenced from... Figure 2 As shown, the permanent magnet 400 has stronger magnetism on the inner side and weaker magnetism on the outer side, and the magnetic flux converges from the outer side to the inner side. Of course, the permanent magnet 400 can be connected to the outer peripheral surface of the rotating shaft 100 facing the shaft cylinder 200. The inner wall surface of the shaft cylinder 200 facing the rotating shaft 100 is provided with a first magnetically conductive protrusion 311, and its magnetization direction is polar opposite external magnetization, that is, the permanent magnet 400 has weaker magnetism on the inner side and stronger magnetism on the outer side, and the magnetic flux converges from the inner side to the outer side.

[0035] With this configuration, the magnetization method is beneficial for providing a stronger magnetic field to the side where the first magnetic protrusion 311 is located, which is more conducive to the first magnetic protrusion 311 inducing the opposite magnetic pole, and also helps to prevent the permanent magnet 400 from leaking the magnetic field to the outside, reducing the risk of magnetic field leakage.

[0036] In a further embodiment, a plurality of first magnetically conductive protrusions 311 are spaced apart along the direction surrounding the rotating shaft 100. Optionally, the plurality of first magnetically conductive protrusions 311 may be evenly or unevenly distributed along the direction surrounding the rotating shaft 100, and the structures of each first magnetically conductive protrusion 311 may be the same or different.

[0037] Optionally, the permanent magnet 400 has a ring-shaped structure and four magnetic pole portions 401. The number of first magnetically conductive protrusions 311 is an approximation of the number of magnetic pole portions 401. (Refer to...) Figure 1 and Figure 8 As shown, the number of the first magnetic protrusion 311 is 4, or, refer to Figure 9 As shown, there are two first magnetic protrusions 311. Of course, the permanent magnet 400 may also have other numbers of magnetic pole portions 401, and the number of first magnetic protrusions 311 may be multiple, but their number is an approximation of the number of magnetic pole portions 401.

[0038] In this embodiment, there are a large number of first magnetic protrusions 311. During the relative rotation of the shaft cylinder 200 and the rotating shaft 100, different first magnetic protrusions 311 correspond to different magnetic pole portions 401, so as to induce magnetic poles opposite to the corresponding magnetic pole portions 401. Then, at least two sets of corresponding first magnetic protrusions 311 and magnetic pole portions 401 generate magnetic forces, and the total magnetic force generated increases, which is more conducive to driving the shaft cylinder 200 and the rotating shaft 100 to rotate smoothly and continuously relative to each other.

[0039] Of course, in other embodiments, the number of the first magnetic protrusion 311 is one.

[0040] In an optional embodiment, the number of first magnetic protrusions 311 is P, and the central angle range corresponding to the first magnetic protrusions 311 is 18° / P to 90° / P. That is, the central angle X1 corresponding to the first magnetic protrusions 311 in the direction surrounding the rotating shaft 100 is 0.1·180° / P to 0.5·180° / P.

[0041] refer to Figure 4 The diagram shows the torque of the first magnetic protrusion 311 under different center angles. Specifically, Figure 4 The different colored lines represent the changes in torque of the magnetic rotation mechanism 10 with the relative rotation angle between the cylinder 200 and the rotating shaft 100 when the central angle X1 corresponding to the first magnetic protrusion 311 and 180° / P are different values. The horizontal axis deg represents the angle °. The relative rotation angle of the cylinder 200 and the rotating shaft 100 is 360 deg when they rotate one revolution relative to each other.

[0042] refer to Figure 5 The schematic diagram shows the variation of the torque of the magnetic rotation mechanism 10 with the ratio of the central angle α corresponding to the first magnetically guided protrusion 311 to 180° / P. (Combined with...) Figure 4 and Figure 5 This indicates that when the ratio of the central angle X1 corresponding to the first magnetic protrusion 311 to 180° / P is between 0.1 and 0.5, the generated torque is relatively large.

[0043] If the ratio between the central angle X1 corresponding to the first magnetic protrusion 311 and 180° / P is large, it will cause a short circuit in the magnetic lines of force between two adjacent magnetic poles 401, reducing torque capability. Therefore, in this embodiment, the ratio between the central angle a corresponding to the first magnetic protrusion 311 and 180° / P is within a reasonable range, and the central angle corresponding to the first magnetic protrusion 311 is within a suitable range, which is beneficial to improving the torque capability of the magnetic rotation mechanism 10. Moreover, the torque waveform is more regular during rotation, which is beneficial to improving torque stability.

[0044] Of course, in other embodiments, the center angle range corresponding to the first magnetic protrusion 311 can be less than 18° / P or greater than 90° / P.

[0045] In an optional embodiment, the rotating shaft 100 or the cylinder 200 of the first magnetic protrusion 311 and the first magnetic protrusion 311 are an integral structure.

[0046] Optionally, a first magnetically conductive protrusion 311 is provided on the outer peripheral surface of the rotating shaft 100 facing the shaft cylinder 200; further optionally, refer to Figure 8 and Figure 9 As shown, the first magnetic conductive element 310 is connected to the rotating shaft 100, and the first magnetic conductive element 310 and the rotating shaft 100 are an integral structure. Specifically, the first magnetic conductive cylinder 312, the first magnetic conductive protrusion 311, and the rotating shaft 100 are all integral structures, which can be formed into an integral structure by casting or welding. Alternatively, the first magnetic conductive protrusion 311 is provided on the inner wall surface of the shaft cylinder 200 facing the rotating shaft 100. Further optionally, the first magnetic conductive element 310 is connected to the shaft cylinder 200. The rotating shaft 100 or shaft cylinder 200 with the first magnetic conductive protrusion 311 and the first magnetic conductive protrusion 311 can be formed into an integral structure by casting or welding.

[0047] In this embodiment, the connection between the first magnetic protrusion 311 and the rotating shaft 100 or the shaft cylinder 200 is integrated, and there is no connection gap between the two. This is more conducive to improving the connection stability between the first magnetic protrusion 311 and the rotating shaft 100, or between the first magnetic protrusion 311 and the shaft cylinder 200, and is conducive to further improving rotational stability.

[0048] Of course, in other embodiments, the rotating shaft 100 or shaft cylinder 200 of the first magnetic protrusion 311 and the first magnetic protrusion 311 are separate structures, and the two can be fixedly connected by means of bonding or other methods.

[0049] In another alternative solution, refer to Figure 10 As shown, the magnetic guide 300 includes a second magnetic guide protrusion 321. At least one of the outer peripheral surface of the rotating shaft 100 facing the shaft cylinder 200 and the inner wall surface of the shaft cylinder 200 facing the rotating shaft 100 is simultaneously provided with a permanent magnet 400 and a second magnetic guide protrusion 321. The number of second magnetic guide protrusions 321 is one or more. The second magnetic guide protrusion 321 is the magnetic guide portion mentioned above. In the direction surrounding the rotating shaft 100, that is, in the circumferential direction of the rotating shaft 100, the second magnetic guide protrusion 321 is opposite to its adjacent magnetic pole portion 401 to induce a magnetic pole opposite to the adjacent magnetic pole portion 401.

[0050] Optionally, a permanent magnet 400 and a second magnetically conductive protrusion 321 are simultaneously provided on the outer peripheral surface of the shaft 100 facing the shaft cylinder 200, and the shaft 100 is a magnetically conductive structure; or, a permanent magnet 400 and a second magnetically conductive protrusion 321 are simultaneously provided on the inner wall surface of the shaft cylinder 200 facing the shaft 100, and the shaft cylinder 200 is a magnetically conductive structure. Further optionally, refer to... Figure 10 As shown, the inner wall surface of the shaft cylinder 200 facing the rotating shaft 100 is provided with multiple magnetic pole portions 401, and the rotating shaft 100 is provided with multiple first magnetically conductive protrusions 311. The same magnetic pole portion 401 is respectively corresponding to the first magnetically conductive protrusion 311 and is also arranged adjacent to the second magnetically conductive protrusion 321.

[0051] Or, refer to Figure 12 As shown, a second magnetically conductive protrusion 321 and a permanent magnet 400 are simultaneously provided on both the outer peripheral surface of the rotating shaft 100 facing the shaft cylinder 200 and the inner wall surface of the shaft cylinder 200 facing the rotating shaft 100. Both the rotating shaft 100 and the shaft cylinder 200 are magnetically conductive structures, specifically made of soft magnetic material. Further optionally, the rotating shaft 100 and its provided second magnetically conductive protrusion 321 can be an integral structure, and the shaft cylinder 200 and its provided second magnetically conductive protrusion 321 can be an integral structure.

[0052] In this embodiment, the magnetic guide 300 is provided with a second magnetic guide protrusion 321 adjacent to the magnetic pole portion 401 of the permanent magnet 400. This allows the second magnetic guide protrusion 321 to replace a portion of the magnetic pole portion 401 of the permanent magnet 400 to induce a magnetic pole opposite to that of the adjacent magnetic pole portion 401. This helps to reduce the number of magnetic pole portions 401, reduce the volume of the permanent magnet 400, reduce the amount of permanent magnet structure used, lower processing costs, reduce the risk of magnetic leakage, prevent magnetic field leakage to the outside, and improve rotational stability.

[0053] In a further embodiment, there are multiple second magnetic protrusions 321, and the second magnetic protrusions 321 and the magnetic pole portion 401 are alternately distributed in the direction surrounding the rotating shaft 100.

[0054] Optionally, refer to Figure 10 As shown, the inner wall surface of the shaft cylinder 200 is provided with two magnetic pole portions 401, both of which are either N poles or S poles. There are two second magnetically conductive protrusions 321, each located between the two magnetic pole portions 401. The magnetic poles induced by the two second magnetically conductive protrusions 321 are both either S poles or N poles; in short, the magnetic poles of the second magnetically conductive protrusions 321 are opposite to those of the adjacent magnetic pole portions 401. Of course, there can also be three, four, or other numbers of magnetic pole portions 401, and the number of second magnetically conductive protrusions 321 can also be set to other numbers, with the magnetic pole portions 401 and the second magnetically conductive protrusions 321 alternately distributed in the direction surrounding the rotating shaft 100.

[0055] In this embodiment, the number of second magnetic protrusions 321 is relatively large. Each second magnetic protrusion 321 replaces a magnetic pole portion 401 that is opposite to the magnetic pole of the adjacent magnetic pole portion 401. Therefore, it is beneficial to further reduce the number of magnetic pole portions 401 provided in the permanent magnet 400, further reduce the volume of the permanent magnet 400, reduce the amount of permanent magnet structure used, further reduce the risk of magnetic leakage, and further improve rotational stability.

[0056] Of course, in other embodiments, the number of second magnetic protrusions 321 can be one.

[0057] In an optional embodiment, the size ratio of the magnetic pole portion 401 and the second magnetically conductive protrusion 321 in the direction surrounding the rotation axis 100 is 1.2 to 1.6. This can also be understood as the ratio of the central angle corresponding to one magnetic pole portion 401 to the central angle corresponding to one second magnetically conductive protrusion 321 being 1.2 to 1.6. (See reference...) Figure 10 and Figure 12 As shown, the center angle corresponding to the magnetic pole portion 401 is X2, and the center angle corresponding to the second magnetic protrusion 321 is X3, with X2 / X3 being 1.2~1.6.

[0058] refer to Figure 11 As shown, when the ratio is less than 1.2, it indicates that the size of the magnetic pole portion 401 in the direction surrounding the rotating shaft 100 is reduced, and the amount of permanent magnet structure used is less. Consequently, the magnetic density induced by the second magnetic protrusion 321 is lower, resulting in reduced torque, poor torque capability, and unstable torque waveform. Similarly, when the ratio is greater than 1.6, the magnetic density induced by the second magnetic protrusion 321 is too high, still leading to reduced torque. Therefore, in this embodiment, the size ratio of the magnetic pole portion 401 and the second magnetic protrusion 321 in the direction surrounding the rotating shaft 100 is within a suitable range. This avoids using too little or too much permanent magnet structure, ensuring a higher magnetic density induced by the second magnetic protrusion 321 and increased torque, which is beneficial for improving torque stability.

[0059] Of course, in other embodiments, the size ratio of the magnetic pole portion 401 and the second magnetic protrusion 321 in the direction surrounding the rotating shaft 100 may be less than 1.2 or greater than 1.6.

[0060] In an optional embodiment, the rotating shaft 100 or shaft cylinder 200 of the second magnetic protrusion 321 and the second magnetic protrusion 321 are an integral structure.

[0061] Optionally, the rotating shaft 100 is provided with a second magnetically conductive protrusion 321 facing the outer peripheral surface of the shaft cylinder 200. Further optionally, there are multiple second magnetically conductive protrusions 321, which constitute a second magnetically conductive element 320. Each second magnetically conductive protrusion 321 and the rotating shaft 100 are integrally formed, and the two can be formed into an integral structure by casting or welding. Alternatively, the shaft cylinder 200 is provided with a second magnetically conductive protrusion 321 facing the inner wall surface of the rotating shaft 100. Further optionally, each second magnetically conductive protrusion 321 and the shaft cylinder 200 are integrally formed, and the two can be formed into an integral structure by casting or welding.

[0062] In this embodiment, the connection between the second magnetic protrusion 321 and the rotating shaft 100 or the shaft cylinder 200 is integrated, and there is no connection gap between the two. This is more conducive to improving the connection stability between the second magnetic protrusion 321 and the rotating shaft 100, or between the second magnetic protrusion 321 and the shaft cylinder 200, and is conducive to further improving rotational stability.

[0063] Of course, in other embodiments, the rotating shaft 100 or shaft cylinder 200 that provides the second magnetic protrusion 321 and the second magnetic protrusion 321 are separate structures, and the two can be fixedly connected by means of bonding or other methods.

[0064] In a further embodiment, reference is made to... Figure 10 and Figure 12 As shown, in the direction surrounding the rotating shaft 100, a first gap a is provided between the second magnetic protrusion 321 and its adjacent magnetic pole portion 401.

[0065] In this embodiment, a first gap a is provided between the second magnetic protrusion 321 and its adjacent magnetic pole portion 401. The magnetic resistance in the first gap a is relatively large, so that the magnetic lines of force pass through the air gap radially to form coupling. This avoids the second magnetic protrusion 321 from contacting its adjacent magnetic pole portion 401, which would cause the magnetic lines of force to short-circuit. This helps to reduce magnetic leakage and improve torque stability.

[0066] In the scheme of this application, the magnetic conductive element 300 only includes the first magnetic conductive protrusion 311, as shown in the reference. Figure 1 As shown, a permanent magnet 400 is provided on the inner wall surface of the shaft cylinder 200 facing the rotating shaft 100, and a first magnetically conductive protrusion 311 is provided on the outer peripheral surface of the rotating shaft 100 facing the shaft cylinder 200, but no second magnetically conductive protrusion 321 is provided; or, the magnetically conductive component 300 only includes the second magnetically conductive protrusion 321, see reference. Figure 12 As shown, both the circumferential surface of the rotating shaft 100 and the inner wall surface of the shaft cylinder 200 are provided with permanent magnets 400 and second magnetically conductive protrusions 321; or, the magnetically conductive component 300 simultaneously includes a first magnetically conductive protrusion 311 and a second magnetically conductive protrusion 321, as shown in the reference. Figure 10 The structure shown is equivalent to Figure 1A portion of the magnetic poles of the permanent magnet 400 are replaced by the second magnetically conductive protrusion 321. That is, the permanent magnet 400 and the second magnetically conductive protrusion 321 are provided on the inner wall surface of the shaft cylinder 200 facing the rotating shaft 100, and the first magnetically conductive protrusion 311 is provided on the outer peripheral surface of the rotating shaft 100 facing the shaft cylinder 200.

[0067] In the alternative solutions of this application, refer to Figure 10 As shown, the magnetic conductive component 300 includes both a first magnetic conductive protrusion 311 and a second magnetic conductive protrusion 321. A permanent magnet 400 and a second magnetic conductive protrusion 321 are provided on one of the outer peripheral surface of the rotating shaft 100 facing the shaft cylinder 200 and the inner wall surface of the shaft cylinder 200 facing the rotating shaft 100, while the other is provided with at least two first magnetic conductive protrusions 311. Specifically, the rotating shaft 100 is provided with a permanent magnet 400 and a second magnetic conductive protrusion 321 on the outer peripheral surface of the shaft cylinder 200, and at least two first magnetic conductive protrusions 311 are provided on the inner wall surface of the shaft cylinder 200; or, the rotating shaft 100 is provided with at least two first magnetic conductive protrusions 311 on the outer peripheral surface of the shaft cylinder 200, and the shaft cylinder 200 is provided with a permanent magnet 400 and a second magnetic conductive protrusion 321 on the inner wall surface of the rotating shaft 100.

[0068] At least one of the first magnetically conductive protrusions 311 corresponds to at least one magnetic pole portion 401 to induce a magnetic pole opposite to the corresponding magnetic pole portion 401, and at least one of the first magnetically conductive protrusions 311 corresponds to at least one second magnetically conductive protrusion 321 to induce a magnetic pole opposite to the corresponding second magnetically conductive protrusion 321.

[0069] Optionally, two first magnetically conductive protrusions 311 are provided on one of the outer peripheral surface of the shaft 100 facing the shaft cylinder 200 and the inner wall surface of the shaft cylinder 200 facing the shaft 100, wherein one first magnetically conductive protrusion 311 corresponds to a magnetic pole portion 401, and the other first magnetically conductive protrusion 311 corresponds to a second magnetically conductive protrusion 321; or, refer to Figure 10 As shown, four first magnetically conductive protrusions 311 are provided on one of the outer peripheral surface of the rotating shaft 100 facing the shaft cylinder 200 and the other of the inner wall surface of the shaft cylinder 200 facing the rotating shaft 100. The permanent magnet 400 includes two magnetic pole portions 401, with two second magnetically conductive protrusions 321 corresponding to these two magnetic pole portions 401 respectively. Two second magnetically conductive protrusions 321 are provided, and the other two first magnetically conductive protrusions 311 correspond to the two second magnetically conductive protrusions 321 respectively. In this way, the permanent magnet 400 and the second magnetically conductive protrusions 321 form magnetic poles with alternating N and S poles, and the multiple first magnetically conductive protrusions 311 also form magnetic poles with alternating N and S poles.

[0070] In this embodiment, among the plurality of first magnetically conductive protrusions 311, a portion of the first magnetically conductive protrusions 311 correspond to the magnetic pole portion 401 to sense the opposite magnetic pole, and at least one first magnetically conductive protrusion 311 corresponds to the second magnetically conductive protrusion 321 to sense the magnetic pole opposite to the corresponding second magnetically conductive protrusion 321. Therefore, not only is a magnetic force generated between the first magnetically conductive protrusion 311 and the corresponding magnetic pole portion 401, but a magnetic force is also generated between the first magnetically conductive protrusion 311 and the corresponding second magnetically conductive protrusion 321. The total magnetic force generated is increased, which is more conducive to the smooth relative rotation of the shaft cylinder 200 and the rotating shaft 100.

[0071] Of course, in other embodiments, each of the first magnetic protrusions 311 corresponds to a different magnetic pole portion 401. Optionally, there are two magnetic pole portions 401 and two second magnetic protrusions 321, and the number of first magnetic protrusions 311 is two. These two first magnetic protrusions 311 are arranged at a 180° angle, and these two first magnetic protrusions 311 correspond to two magnetic pole portions 401 respectively.

[0072] In an alternative embodiment of this application, the number of permanent magnets 400 is at least two, including a first permanent magnet 410 and a second permanent magnet 420. Both the first permanent magnet 410 and the second permanent magnet 420 include multiple magnetic pole portions 401. (Reference) Figure 13 As shown, a first permanent magnet 410 and a second permanent magnet 420 are respectively provided on the outer peripheral surface of the rotating shaft 100 facing the shaft cylinder 200 and the inner wall surface of the shaft cylinder 200 facing the rotating shaft 100. The number of pole pairs of the first permanent magnet 410 is not equal to the number of pole pairs of the second permanent magnet 420. The magnetic conductive element 300 includes a third magnetic conductive element 330, which is located in the annular space between the first permanent magnet 410 and the second permanent magnet 420. The third magnetic conductive element 330 is neither connected to the first permanent magnet 410 nor to the second permanent magnet 420.

[0073] The third magnetic conductive element 330 includes a plurality of third magnetic conductive protrusions 331, which are spaced apart along the direction surrounding the rotating shaft 100. The third magnetic conductive protrusions 331 may be evenly or unevenly distributed along the direction surrounding the rotating shaft 100, and the structures of each third magnetic conductive protrusion 331 may be the same or different. Moreover, in the radial direction of the rotating shaft 100, a second gap is provided between the third magnetic conductive protrusions 331 and the first permanent magnet 410 and the second permanent magnet 420, respectively. That is to say, the third magnetic conductive element 330 does not contact the first permanent magnet 410 or the second permanent magnet 420.

[0074] In this embodiment, when the number of pole pairs of the first permanent magnet 410 is not equal to the number of pole pairs of the second permanent magnet 420, a third magnetic conductor 330 is added. This allows the third magnetic conductor 330 to modulate the magnetic field generated by the second permanent magnet 420, making the magnetic field generated by the second permanent magnet 420 inside the third magnetic conductor 330 more compatible and synchronized with the magnetic field of the first permanent magnet 410. This is beneficial for generating a more stable torque, improving torque stability, and improving rotational stability.

[0075] Of course, in other embodiments, the third magnetic conductor 330 may not be provided in the annular space between the first permanent magnet 410 and the second permanent magnet 420.

[0076] In an optional embodiment, the first permanent magnet 410 has P1 pairs of magnetic poles, the second permanent magnet 420 has P2 pairs of magnetic poles, and the third magnetic conductor 330 includes P3 third magnetic protrusions 331, all of which satisfy the condition: P3 = P1 + P2. That is, the number of third magnetic protrusions 331 is the sum of the number of magnetic pole pairs of the first permanent magnet 410 and the number of magnetic pole pairs of the second permanent magnet 420.

[0077] Optionally, P1=2, the first permanent magnet 410 has 2 pairs of magnetic poles and 4 magnetic pole portions 401; P2=3, the second permanent magnet 420 has 3 pairs of magnetic poles and 6 magnetic pole portions 401; the third magnetic conductive element 330 includes 5 third magnetic conductive protrusions 331. Of course, the number of magnetic pole pairs of the first permanent magnet 410 and the second permanent magnet 420 can be other numbers, and the number of third magnetic conductive protrusions 331 can also be other numbers, as long as the above conditions are met.

[0078] Optionally, the first permanent magnet 410 includes 2P1 magnetic pole portions 401, and the second permanent magnet 420 includes 2P2 magnetic pole portions 401. A portion of the magnetic pole portions 401 of the first permanent magnet 410 and the second permanent magnet 420 can be replaced by the magnetically conductive protrusions described above, thereby reducing the volume of the first permanent magnet 410 and the second permanent magnet 420, reducing the amount of permanent magnet structure used, lowering the risk of magnetic leakage, and improving torque stability.

[0079] In this embodiment, the number of the third magnetic protrusions 331 satisfies the above relationship. After the third magnetic component 330 modulates the magnetic field, the second permanent magnet 420 forms a magnetic field with P3-P2 pole pairs inside the third magnetic component 330. P3-P2 is exactly the same as the number of pole pairs of the first permanent magnet 410. That is, the effective harmonic pole pairs after modulation are exactly equal to the number of pole pairs of the first permanent magnet 410. At this time, the magnetic field of the first permanent magnet 410 and the harmonic magnetic field act synchronously, generating a more stable tangential force, which is more conducive to the transmission of torque and improves torque stability.

[0080] Of course, in other embodiments, the number of the third magnetic protrusions 331 may not satisfy the above relationship, but the torque stability can be improved by modulating the third magnetic protrusions 331.

[0081] In a further embodiment, reference is made to... Figure 13 and Figure 15 As shown, the magnetic rotation mechanism 10 also includes a support sleeve 500, which does not have a magnetic conduction effect. The support sleeve 500 is sleeved on the outside of the first permanent magnet 410, and the third magnetically conductive protrusions 331 are spaced apart on the support sleeve 500. The support sleeve 500 supports each of the third magnetically conductive protrusions 331, so that there is a second gap between the third magnetically conductive protrusions 331 and the first permanent magnet 410, and between the third magnetically conductive protrusions 331 and the second permanent magnet 420, so as to avoid the third magnetically conductive protrusions 331 from contacting the first permanent magnet 410 or the second permanent magnet 420.

[0082] The support sleeve 500 and the third magnetic conductive component 330 can be fixedly connected by welding, bonding or other methods.

[0083] Optionally, the third magnetic conductive element 330 includes only a plurality of third magnetic conductive protrusions 331, which are directly disposed on the outer wall surface of the support sleeve 500; or, refer to Figure 13 As shown, the third magnetic conductive element 330 also includes a second magnetic conductive cylinder portion 332, which is sleeved on the outside of the support sleeve 500. Each third magnetic conductive protrusion 331 is spaced apart on the outer wall surface of the second magnetic conductive cylinder portion 332. Optionally, the third magnetic conductive protrusion 331 and the second magnetic conductive cylinder portion 332 can be an integral structure.

[0084] In this embodiment, the magnetic rotation mechanism 10 is equipped with a support sleeve 500. The support sleeve 500 supports the third magnetic conductive element 330, so that there is a radial gap between the third magnetic conductive protrusion 331 and the first permanent magnet 410, avoiding direct contact between the third magnetic conductive protrusion 331 and the first permanent magnet 410, and realizing contactless transmission.

[0085] Based on the magnetic rotation mechanism 10 disclosed in this application, embodiments of this application also disclose an electronic device, see reference. Figure 6 and Figure 14 As shown, the electronic device includes the magnetic rotation mechanism 10, the first device body 20 and the second device body 30 in the above embodiments. The first device body 20 is connected to the rotating shaft 100, and the second device body 30 is connected to the shaft cylinder 200. The first device body 20 and the second device body 30 achieve relative rotation through the magnetic rotation mechanism 10.

[0086] The first equipment body 20 and the rotating shaft 100, and the second equipment body 30 and the shaft cylinder 200, can be fixedly connected by welding, bonding, or other methods. Optionally, refer to... Figure 7 and Figure 15 As shown, the second equipment body 30 can be provided with a slot, and the rotating shaft 100, permanent magnet 400, magnetic conductive component 300 and part of the shaft cylinder 200 can all extend into the slot.

[0087] Optionally, the first device body 20 can be a handheld part, and the second device body 30 is equipped with a display screen. During the process of the user assisting in rotating the second device body 30, the second device body 30 will rotate to a certain position and then remain at that position.

[0088] by Figure 1 Taking the illustrated scheme as an example, the rotating shaft 100 is provided with a first magnetic conductive element 310, which includes four first magnetic conductive protrusions 311. The shaft cylinder 200 is provided with a permanent magnet 400, which has a ring structure and four magnetic pole portions 401, with a pole pair count of two. If the rotating shaft 100 and the first magnetic conductive element 310 remain stationary, and the shaft cylinder 200 and the permanent magnet 400 rotate relative to the rotating shaft 100, then the shaft cylinder 200 and the permanent magnet 400 will be subjected to... Figure 3 The torque shown. Specifically, Figure 3 A schematic diagram is shown showing the change in torque of the magnetic rotation mechanism 10 as the cylinder 200 rotates relative to the shaft 100 by an arc. It should be noted that one revolution of the cylinder 200 relative to the shaft 100 indicates that the arc of rotation of the cylinder 200 relative to the shaft 100 is 2π rad.

[0089] Therefore, it can be seen that during the rotation of the cylinder 200 relative to the shaft 100, there are 8 positions where the torque is 0, of which 4 positions where the torque is 0 are relatively stable. Specifically, Figure 3 The rotation radians corresponding to the positions marked by the numbers 1, 2, 3, and 4 indicate that when the shaft cylinder 200 rotates relative to the rotating shaft 100 to the corresponding radian, the torque of the magnetic rotation mechanism 10 is 0 and the torque is relatively stable. When the shaft cylinder 200 and the permanent magnet 400 rotate to any of these four positions where the torque is zero, if the user stops applying force, the shaft cylinder 200 and the permanent magnet 400 will remain in the corresponding positions, thus achieving relative fixation between the shaft cylinder 200 and the rotating shaft 100.

[0090] In this embodiment, the magnetic rotation mechanism 10 of the electronic device is provided with a magnetic guide 300. The magnetic guide part of the magnetic guide 300 replaces the original permanent magnet structure, which helps to reduce the volume of the permanent magnet structure, reduce the amount of permanent magnet structure used, reduce processing costs, reduce the risk of magnetic leakage, and prevent the leakage of magnetic field to the outside, thereby improving the rotational stability of the electronic device.

[0091] The electronic devices disclosed in this application can be cameras, monitoring devices, etc., and this application does not limit the specific types of electronic devices.

[0092] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A magnetic rotation mechanism, characterized in that, The device includes a rotating shaft (100), a shaft sleeve (200), a permanent magnet (400), and a magnetic conductor (300). The shaft sleeve (200) is sleeved on the rotating shaft (100). The permanent magnet (400) is provided on at least one of the outer peripheral surface of the rotating shaft (100) facing the shaft sleeve (200) and the inner wall surface of the shaft sleeve (200) facing the rotating shaft (100). The permanent magnet (400) includes a plurality of magnetic pole portions (401). The magnetic guide (300) is located in the annular space between the rotating shaft (100) and the shaft cylinder (200). The magnetic guide (300) includes at least one magnetic guide portion, and at least a portion of the magnetic guide portion corresponds to at least one magnetic pole portion (401). Each magnetic guide portion is used to induce a magnetic pole opposite to the corresponding magnetic pole portion (401) so that the magnetic guide portion interacts with the corresponding magnetic pole portion (401) to realize the relative rotation of the shaft cylinder (200) and the rotating shaft (100).

2. The magnetic rotation mechanism according to claim 1, characterized in that, The magnetic conductive component (300) includes a first magnetic conductive protrusion (311). The permanent magnet (400) is provided on one of the outer peripheral surface of the rotating shaft (100) facing the shaft cylinder (200) and the inner wall surface of the shaft cylinder (200) facing the rotating shaft (100), and the first magnetic conductive protrusion (311) is provided on the other. The first magnetic conductive protrusion (311) is the magnetic conductive part, and the first magnetic conductive protrusion (311) protrudes towards the side where the permanent magnet (400) is located. And / or, the magnetic conductor (300) includes a second magnetic protrusion (321), and at least one of the outer peripheral surface of the shaft (100) facing the shaft cylinder (200) and the inner wall surface of the shaft cylinder (200) facing the shaft (100) is provided with the permanent magnet (400) and the second magnetic protrusion (321). The second magnetic protrusion (321) is the magnetic part. In the direction surrounding the shaft (100), the second magnetic protrusion (321) is opposite to its adjacent magnetic pole part (401) to induce a magnetic pole opposite to the adjacent magnetic pole part (401).

3. The magnetic rotation mechanism according to claim 2, characterized in that, The permanent magnet (400) and the second magnetic protrusion (321) are provided on one of the outer peripheral surface of the shaft (100) facing the shaft cylinder (200) and the inner wall surface of the shaft cylinder (200) facing the shaft (100), and at least two first magnetic protrusions (311) are provided on the other. At least one of the first magnetic protrusions (311) corresponds to at least one of the magnetic pole portions (401) to induce a magnetic pole opposite to the corresponding magnetic pole portion (401), and at least one of the first magnetic protrusions (311) corresponds to at least one of the second magnetic protrusions (321) to induce a magnetic pole opposite to the corresponding second magnetic protrusion (321).

4. The magnetic rotation mechanism according to claim 2, characterized in that, The first magnetically conductive protrusion (311) is provided in multiple intervals along the direction surrounding the rotating shaft (100); The number of the second magnetic protrusions (321) is multiple, and the second magnetic protrusions (321) and the magnetic pole portion (401) are alternately distributed in the direction surrounding the rotating shaft (100).

5. The magnetic rotation mechanism according to claim 2, characterized in that, The number of the first magnetic protrusions (311) is P, and the center angle of the first magnetic protrusions (311) is 18° / P~90° / P; The ratio of the size of the magnetic pole portion (401) and the second magnetic protrusion (321) in the direction surrounding the rotating shaft (100) is 1.2 to 1.

6.

6. The magnetic rotation mechanism according to claim 2, characterized in that, The rotating shaft (100) or the shaft cylinder (200) of the first magnetically conductive protrusion (311) and the first magnetically conductive protrusion (311) are an integral structure. The rotating shaft (100) or the shaft cylinder (200) that provides the second magnetic protrusion (321) and the second magnetic protrusion (321) are an integral structure.

7. The magnetic rotation mechanism according to claim 2, characterized in that, In the direction surrounding the pivot (100), a first gap (a) is provided between the second magnetic protrusion (321) and its adjacent magnetic pole portion (401).

8. The magnetic rotation mechanism according to claim 1, characterized in that, The number of permanent magnets (400) is at least two, including a first permanent magnet (410) and a second permanent magnet (420). The first permanent magnet (410) and the second permanent magnet (420) are respectively provided on the outer peripheral surface of the shaft (100) facing the shaft cylinder (200) and the inner wall surface of the shaft cylinder (200) facing the shaft (100). The magnetic conductive element (300) includes a third magnetic conductive element (330), which is located in the annular space between the first permanent magnet (410) and the second permanent magnet (420). The third magnetic conductive element (330) includes a plurality of third magnetic conductive protrusions (331), which are spaced apart along the direction surrounding the rotating shaft (100), and in the radial direction of the rotating shaft (100), the third magnetic conductive protrusions (331) are respectively provided with a second gap between the third magnetic conductive protrusions (331) and the first permanent magnet (410) and the second permanent magnet (420).

9. The magnetic rotation mechanism according to claim 8, characterized in that, The first permanent magnet (410) has P1 pairs of magnetic poles, the second permanent magnet (420) has P2 pairs of magnetic poles, and the third magnetic conductive element (330) includes P3 third magnetic conductive protrusions (331). The three satisfy the condition: P3 = P1 + P2.

10. An electronic device, characterized in that, The device includes a magnetic rotation mechanism (10) as described in any one of claims 1-9, a first device body (20) and a second device body (30), wherein the first device body (20) is connected to the rotating shaft (100) and the second device body (30) is connected to the shaft cylinder (200), and the first device body (20) and the second device body (30) achieve relative rotation through the magnetic rotation mechanism (10).

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