Vibration energy collecting device and micro electronic equipment

Abstract

The utility model discloses a vibration energy collecting device and miniature electronic equipment, the vibration energy collecting device comprises a core shaft, a first magnetic member, a second magnetic member, a coil and a third magnetic member, the first magnetic member and the second magnetic member are respectively arranged at two ends of the core shaft, at least part of the first magnetic piece and at least part of the second magnetic piece are both located outside the peripheral face of the mandrel. The coil surrounds the mandrel and is arranged between the first magnetic piece and the second magnetic piece; a third magnetic part is arranged between the first magnetic part and the second magnetic part, the third magnetic part and the first magnetic part repel each other, the third magnetic part and the second magnetic part repel each other, and the third magnetic part is arranged on the peripheral face of the mandrel in a sliding and sleeving mode. The vibration energy collecting device can collect vibration energy for power generation and is applied to the technical field of vibration energy recovery.

Description

Technical Field

[0001] This utility model relates to the field of vibration energy recovery technology, and in particular to vibration energy harvesting devices and microelectronic devices. Background Technology

[0002] Most miniature wireless sensors rely on batteries for power. Due to the size limitations of miniature wireless sensors, button batteries are usually used for power. However, button batteries have limited capacity and are inconvenient to replace. Therefore, miniature wireless sensors can only work intermittently and cannot work continuously at high frequency. The sensing information cannot be sensed and fed back in real time. If the battery is too large, it is impossible to achieve miniaturization of the wireless sensor. Utility Model Content

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a vibration energy harvesting device capable of harvesting vibration energy to generate electricity.

[0004] A microelectronic device with the aforementioned vibration energy harvesting device is also proposed.

[0005] The vibration energy harvesting device according to a first aspect embodiment of the present invention includes:

[0006] mandrel;

[0007] A first magnetic element and a second magnetic element are respectively disposed at both ends of the mandrel, and at least a portion of the first magnetic element and at least a portion of the second magnetic element are located outside the outer peripheral surface of the mandrel.

[0008] A coil is wound around the core shaft and disposed between the first magnetic element and the second magnetic element;

[0009] A third magnetic element is disposed between the first magnetic element and the second magnetic element. The third magnetic element repels the first magnetic element and the second magnetic element. The third magnetic element is slidably sleeved on the outer peripheral surface of the mandrel.

[0010] The vibration energy harvesting device according to the first aspect of the present invention has at least the following beneficial effects: when applied to a vibration scenario, the third magnetic component moves back and forth between the first magnetic component and the second magnetic component along the axial direction of the spindle. At this time, the coil cuts the magnetic field lines of the third magnetic component and generates current, thereby realizing vibration power generation.

[0011] According to some embodiments of the present invention, the first magnetic element and / or the second magnetic element are detachably connected to the end of the mandrel.

[0012] According to some embodiments of the present invention, the first magnetic element is sleeved on the mandrel, the mandrel includes a main shaft portion and a first limiting portion connected to one end of the main shaft portion, at least a portion of the first limiting portion is located outside the outer peripheral surface of the main shaft portion, and stops the end of the first magnetic element away from the second magnetic element.

[0013] According to some embodiments of the present invention, the first limiting part and the main shaft part are connected as an integral structure.

[0014] According to some embodiments of the present invention, the first limiting part is detachably connected to the main shaft part.

[0015] According to some embodiments of the present invention, the outer peripheral surface of the main shaft is provided with a limiting hole, the first limiting part includes a connecting part and a stop limiting part, the connecting part is detachably connected to the limiting hole, and the stop limiting part is located outside the outer peripheral surface of the main shaft and stops the end of the first magnetic element away from the second magnetic element;

[0016] Alternatively, the outer peripheral surface of the main shaft is provided with an annular groove along the circumference of the main shaft, and the first limiting part is annularly engaged with the annular groove. A portion of the first limiting part is located outside the outer peripheral surface of the main shaft and blocks the end of the first magnetic element that is away from the second magnetic element.

[0017] According to some embodiments of the present invention, the first magnetic element and / or the second magnetic element are connected to the mandrel as an integral structure.

[0018] According to some embodiments of the present invention, the coil is disposed radially outside the third magnetic element along the core shaft.

[0019] According to some embodiments of the present invention, the coil includes a coil layer and a curing layer connected to the coil layer, the curing layer being used to fix the coil layer.

[0020] According to some embodiments of the present invention, the curing layer includes a first layer and a second layer, wherein the first layer, the coil layer and the second layer are distributed sequentially along the radial direction of the mandrel, and the first layer and the second layer clamp and fix the coil layer.

[0021] Alternatively, the cured layer and the coil layer can be connected as a single structure.

[0022] According to some embodiments of the present invention, the coil is connected to the first magnetic element and / or the second magnetic element as an integral structure.

[0023] According to some embodiments of the present invention, the coil resin is cured on the first magnetic element and / or the second magnetic element.

[0024] According to some embodiments of this utility model, the diameter of the mandrel is Φ, the thickness of the mandrel is h, and the mandrel satisfies: 0mm < Φ ≤ 20mm, 0mm < h ≤ 40mm.

[0025] According to some embodiments of the present invention, the third magnetic component includes a magnetic ring and a sliding auxiliary component disposed on the inner peripheral surface of the magnetic ring, the sliding auxiliary component being slidably connected to the outer peripheral surface of the mandrel.

[0026] According to some embodiments of this utility model, the mandrel is made of a non-ferromagnetic material.

[0027] A microelectronic device according to a second aspect of the present invention includes: the vibration energy harvesting device described in the first aspect embodiment.

[0028] The microelectronic device according to the second aspect of the present invention has at least the following beneficial effects: the microelectronic device can obtain continuous electrical energy through vibration, enabling the microelectronic device to work efficiently for a long time in a vibration environment, thereby improving the battery life of the microelectronic device.

[0029] 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

[0030] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0031] Figure 1 This is a schematic diagram of the structure of a vibration energy harvesting device according to an embodiment of the present invention.

[0032] Icon labels:

[0033] Mandrel 100; Main spindle 110; First limiting part 120; Second limiting part 130;

[0034] First magnetic component 200;

[0035] Second magnetic component 300;

[0036] Coil 400;

[0037] Third magnetic component 500. Detailed Implementation

[0038] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0039] In the description of this utility model, it should be understood that the orientation descriptions, such as up, down, etc., are based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0040] In the description of this utility model, "several" refers to one or more, and "multiple" refers to two or more. The use of "first" and "second" is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, the number of indicated technical features, or the sequential relationship between indicated technical features.

[0041] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0042] With the development of automotive electronics and intelligence, smart tires have become an important component of vehicle control systems, affecting driving safety and comfort, and providing data to control systems both inside and outside the vehicle. Based on the application scenarios of smart tires, they are typically equipped with miniature wireless sensors that transmit tire-related information. However, the limitations of these miniature wireless sensors—that they can only operate intermittently, not continuously at high frequencies, and that they cannot provide immediate feedback—have hindered the development of smart tires.

[0043] Reference Figure 1As shown, the first aspect of this utility model provides a vibration energy harvesting device, comprising: a spindle 100, a first magnetic element 200, a second magnetic element 300, a coil 400, and a third magnetic element 500. The first magnetic element 200 and the second magnetic element 300 are respectively disposed at both ends of the spindle 100, and at least a portion of the first magnetic element 200 and at least a portion of the second magnetic element 300 are located outside the outer peripheral surface of the spindle 100. The coil 400 is wrapped around the spindle 100 and disposed between the first magnetic element 200 and the second magnetic element 300. The third magnetic element 500 is disposed between the first magnetic element 200 and the second magnetic element 300, and the third magnetic element 500 repels the first magnetic element 200 and the second magnetic element 300. The third magnetic element 500 is slidably sleeved on the outer peripheral surface of the spindle 100.

[0044] In this embodiment, the mandrel 100 is cylindrical, and the outer circumferential surface of the mandrel 100 is a circular surface. The circular surface makes it easier for the third magnetic element 500 to slide along the axial direction of the mandrel 100 on the outer circumferential surface of the mandrel 100. In other embodiments, the mandrel 100 may also be triangular prism, rectangular prism, or other polygonal prism or elliptical prism.

[0045] The first magnetic element 200 is disk-shaped, and its axis is substantially coincident with the axis of the mandrel 100, resulting in the first magnetic element 200 having an annular portion extending beyond the outer circumferential surface of the mandrel 100. The first magnetic element 200 may also be rectangular, polygonal, or elliptical. When the first magnetic element 200 is a rectangular disk disposed at one end of the cylindrical mandrel 100, the four corners of the rectangle in the first magnetic element 200 extend beyond the outer circumferential surface of the mandrel 100. In other embodiments, the first magnetic element 200 may also be an annular ring fitted onto the outer circumferential surface of the mandrel 100, or the first magnetic element 200 may include multiple magnetic components distributed sequentially along the circumference of the mandrel 100.

[0046] The second magnetic element 300 has a basically the same shape as the first magnetic element 200. Both the first magnetic element 200 and the second magnetic element 300 are disc-shaped and have basically the same size. Of course, their sizes can also be different. In other embodiments, the second magnetic element 300 and the first magnetic element 200 can also have different shapes. For example, the first magnetic element 200 is disc-shaped and the second magnetic element 300 is rectangular disc-shaped. The specific shapes of the first magnetic element 200 and the second magnetic element 300 can be selected according to actual needs, and this utility model does not limit their specific shapes.

[0047] The coil 400 is formed by spirally winding a wire, forming a helical shape and wrapping around the mandrel 100. In other embodiments, the coil 400 may be formed by winding in other ways, as long as the coil 400 is wrapped around the mandrel 100.

[0048] In addition, when the vibration energy harvesting device also includes other structures such as a housing, the spindle 100 is installed inside the housing, the first magnetic element 200 and the second magnetic element 300 can be connected to the housing and are located at both ends of the spindle 100 respectively, and the coil 400 can be connected to the housing and be wrapped around the spindle 100.

[0049] The third magnetic element 500 is annularly slidably sleeved on the outer circumference of the mandrel 100, sliding along the axial direction of the mandrel 100. The third magnetic element 500 repels the first magnetic element 200 and the second magnetic element 300, causing the third magnetic element 500 to suspend between the first magnetic element 200 and the second magnetic element 300, and to be in a state of force equilibrium. When subjected to an external force along the axial direction of the mandrel 100, the force equilibrium is broken, causing the third magnetic element 500 to reciprocate along the axial direction of the mandrel 100. When the external force disappears, the third magnetic element 500 will gradually return to the state of force equilibrium. During the reciprocating movement of the third magnetic element 500 along the axial direction of the mandrel 100, the magnetic field lines of the third magnetic element 500 will move relative to the coil 400, causing the coil 400 to cut the magnetic field lines and generate an induced current, thus realizing the induced electrification of the coil 400. In other words, when the vibration energy harvesting device is applied to a vibration scenario, the third magnetic component 500 moves back and forth between the first magnetic component 200 and the second magnetic component 300 along the axis of the spindle 100. The coil 400 cuts the magnetic field lines of the third magnetic component 500 and generates current, thereby realizing vibration power generation.

[0050] Specifically, the magnetic properties of the opposite ends of the first magnetic element 200 and the third magnetic element 500 are the same, and the magnetic properties of the opposite ends of the second magnetic element 300 and the third magnetic element 500 are the same. For example, the magnetic properties of the opposite ends of the first magnetic element 200 and the third magnetic element 500 are both N poles, and the magnetic properties of the opposite ends of the second magnetic element 300 and the third magnetic element 500 are both S poles, or the magnetic properties of the opposite ends of the first magnetic element 200 and the third magnetic element 500 are both S poles, and the magnetic properties of the opposite ends of the second magnetic element 300 and the third magnetic element 500 are both N poles.

[0051] Reference Figure 1 As shown, in some embodiments of this utility model, the first magnetic component 200 and / or the second magnetic component 300 are detachably connected to the end of the spindle 100 to facilitate maintenance of the vibration energy harvesting device during its use. When a component is damaged, the first magnetic component 200 or the second magnetic component 300 can be disassembled, and then the third magnetic component 500, the spindle 100, and the coil 400 can be disassembled to replace the first magnetic component 200, the second magnetic component 300, the third magnetic component 500, the spindle 100, or the coil 400, thus saving maintenance costs.

[0052] Reference Figure 1As shown, in some specific embodiments of this utility model, the first magnetic element 200 is sleeved on the mandrel 100. The mandrel 100 includes a main shaft portion 110 and a first limiting portion 120 connected to one end of the main shaft portion 110. At least a portion of the first limiting portion 120 is located outside the outer peripheral surface of the main shaft portion 110 and blocks the end of the first magnetic element 200 away from the second magnetic element 300.

[0053] It is understandable that by stopping the first magnetic component 200 through the first limiting part 120, the end of the first magnetic component 200 away from the second magnetic component 300 is restricted from coming out of the main shaft part 110. The end of the first magnetic component 200 facing the second magnetic component 300 repels the second magnetic component 300. Under the influence of the repulsive force, the first magnetic component 200 will continue to abut against the first limiting part 120, so that the first magnetic component 200 is in a state of force balance, thereby fixing the first magnetic component 200.

[0054] In addition, the second magnetic element 300 is sleeved on the spindle 100. The spindle 100 also includes a second limiting part 130 connected to the other end of the main spindle part 110. At least a portion of the second limiting part 130 is located outside the outer peripheral surface of the main spindle part 110 and stops the end of the second magnetic element 300 away from the first magnetic element 200. The second magnetic element 300 continuously abuts against the second limiting part 130 through mutual repulsion, so that the second magnetic element 300 can also be in a state of force balance, thereby fixing the second magnetic element 300.

[0055] Reference Figure 1 As shown, in some embodiments of this utility model, the first limiting part 120 and the main spindle part 110 are connected as an integral structure, so that the first limiting part 120 and the main spindle part 110 do not need to be assembled, saving the assembly process and improving the assembly efficiency.

[0056] In this embodiment, the first limiting part 120 can be integrally formed with the spindle part 110. Generally, the integrally formed first limiting part 120 can be considered to be entirely located outside the outer peripheral surface of the spindle part 110 and connected to the outer peripheral surface of the spindle part 110. In other embodiments, the first limiting part 120 can also be integrally connected to the spindle part 110 by welding, bonding, or other methods. When the connection position is on the outer peripheral surface of the spindle part 110, the first limiting part 120 can be considered to be entirely located outside the outer peripheral surface of the spindle part 110. When the connection position is on the end face of the spindle part 110, a portion of the first limiting part 120 is located outside the outer peripheral surface of the spindle part 110.

[0057] In addition, the second limiting part 130 can also be an integral structure connected to the main shaft part 110. When both the first limiting part 120 and the second limiting part 130 are integrally connected to the main shaft part 110, the first magnetic component 200 includes multiple magnetic components, a first half-ring part and a second half-ring part. The first half-ring part and the second half-ring part are spliced ​​into an integral ring part and sleeved on the spindle 100. Some magnetic components are connected to the first half-ring part and other magnetic components are connected to the second half-ring part. The structure of the second magnetic component 300 and the third magnetic component 500 is basically the same as that of the first magnetic component 200. The number and distribution of their magnetic components may differ, which will not be described in detail here.

[0058] Reference Figure 1 As shown, in some embodiments of this utility model, the first limiting part 120 is detachably connected to the main shaft part 110, so that the first limiting part 120 can be separated from the main shaft part 110, thereby disassembling the first magnetic component 200 and the third magnetic component 500, which facilitates the maintenance of the parts. In addition, the second limiting part can also be detachably connected to the main shaft part 110.

[0059] Reference Figure 1 As shown, in some specific embodiments of this utility model, the outer peripheral surface of the spindle portion 110 is provided with a limiting hole, the first limiting portion 120 includes a connecting portion and a stop limiting portion, the connecting portion is detachably connected to the limiting hole, and the stop limiting portion is located outside the outer peripheral surface of the spindle portion 110 and stops the end of the first magnetic element 200 away from the second magnetic element 300.

[0060] In this embodiment, the connecting part can be detachably connected to the limiting hole via threads. Specifically, the first limiting part 120 can be a bolt or a threaded pin, and the inner circumferential surface of the limiting hole has threads, thus forming a threaded hole.

[0061] Reference Figure 1 As shown, in some specific embodiments of this utility model, the outer peripheral surface of the main shaft portion 110 is provided with an annular groove along the circumference of the main shaft portion 110, and the first limiting portion 120 is annularly engaged in the annular groove. Part of the first limiting portion 120 is located outside the outer peripheral surface of the main shaft portion 110 and blocks the end of the first magnetic element 200 away from the second magnetic element 300.

[0062] In this embodiment, the first limiting part 120 is annularly clamped within the annular groove. Specifically, the first limiting part 120 is a clamp.

[0063] Reference Figure 1 As shown, in some specific embodiments of this utility model, the first magnetic component 200 and / or the second magnetic component 300 are connected to the mandrel 100 as an integral structure to save assembly process and improve assembly efficiency.

[0064] Specifically, the first magnetic component 200 and the second magnetic component 300 can be integrally formed with the mandrel 100, or connected as one unit by means of bonding or other methods.

[0065] Reference Figure 1 As shown, in some specific embodiments of this utility model, the coil 400 is disposed radially outside the third magnetic element 500 along the core shaft 100.

[0066] Specifically, when the third magnetic element 500 moves along the axial direction of the spindle 100, the magnetic field lines of the outer ring of the third magnetic element 500 are cut by the coil 400.

[0067] In another embodiment, the coil 400 can also be integrated with the spindle 100 and located on the surface of the spindle 100. When the third magnetic element 500 moves along the axial direction of the spindle 100, the magnetic field lines of the inner ring of the third magnetic element 500 are cut by the coil 400, thereby reducing the overall radial dimension of the device. Alternatively, the coil 400 can be spaced apart from the third magnetic element 500 along the radial direction of the spindle 100. When the third magnetic element 500 moves along the axial direction of the spindle 100, the magnetic field lines between the outer and inner rings of the third magnetic element 500 are cut by the coil 400.

[0068] Reference Figure 1 As shown, in some embodiments of this utility model, the coil 400 includes a coil layer and a curing layer connected to the coil layer, the curing layer being used to fix the coil layer.

[0069] It is worth understanding that the coil layer is fixed as a whole by the curing layer, making the installation of the coil 400 more convenient. Specifically, when the coil layer is cured by the curing layer, the two axial ends of the coil 400 can respectively abut against the first magnetic component 200 and the second magnetic component 300, realizing a detachable connection between the coil 400 and the first magnetic component 200 and the second magnetic component 300.

[0070] Reference Figure 1 As shown, in some specific embodiments of this utility model, the curing layer includes a first layer and a second layer. The first layer, the coil layer and the second layer are distributed sequentially along the radial direction of the mandrel 100, and the first layer and the second layer clamp and fix the coil layer.

[0071] In this embodiment, the first layer and the second layer together clamp and fix the coil layer, so that the coil layer is subjected to a clamping force along the radial direction of the core shaft 100, thereby achieving clamping and fixing.

[0072] Reference Figure 1 As shown, in some specific embodiments of this utility model, the curing layer and the coil layer are connected as an integral structure.

[0073] In this embodiment, the cured layer is resin. By coating the coil layer with molten resin, and allowing the resin to cool, the cured layer and the coil layer are bonded together as a single structure. The cured layer effectively supports the coil layer, making it less prone to deformation. In other embodiments, the cured layer may also be an adhesive layer.

[0074] Reference Figure 1 As shown, in some specific embodiments of this utility model, the coil 400 is connected to the first magnetic element 200 and / or the second magnetic element 300 as an integral structure.

[0075] In this embodiment, the coil 400 is connected to the first magnetic element 200 as an integral structure by resin, or connected to the second magnetic element 300 as an integral structure by resin, or connected to the first magnetic element 200 and the second magnetic element 300 by resin. In other embodiments, the coil 400 may also be connected to the first magnetic element 200 and / or the second magnetic element 300 as an integral structure by means of bonding or other methods.

[0076] Reference Figure 1 As shown, in some specific embodiments of this utility model, the diameter of the mandrel 100 is Φ, the thickness of the mandrel 100 is h, and the mandrel 100 satisfies: 0mm<Φ≤20mm, 0mm<h≤40mm.

[0077] It is understandable that the diameter and thickness of the spindle 100 are relatively small to accommodate the size of the miniature wireless sensor, allowing it to be installed inside the miniature sensor without excessively increasing the overall size of the miniature wireless sensor.

[0078] Reference Figure 1 As shown, in some specific embodiments of this utility model, the third magnetic component 500 includes a magnetic ring and a sliding auxiliary component disposed on the inner peripheral surface of the magnetic ring. The sliding auxiliary component is slidably connected to the outer peripheral surface of the mandrel 100.

[0079] It is worth understanding that the magnetic ring moves axially along the mandrel 100 via a sliding auxiliary component, making the movement of the magnetic ring smoother and less prone to deflection and collision with the outer circumference of the mandrel 100, thus making it more reliable in use.

[0080] In this embodiment, the inner circumferential surface of the sliding auxiliary component is a smooth surface, and the outer circumferential surface of the mandrel 100 is also a smooth surface. The inner circumferential surface of the sliding auxiliary component and the outer circumferential surface of the mandrel 100 are in clearance fit, and the smooth surface reduces friction, thereby making the movement of the magnetic ring smoother. In other embodiments, the sliding auxiliary component includes a sliding ring body and multiple ball sets. The multiple ball sets are evenly spaced along the axial direction of the sliding ring body, and each ball set includes multiple balls along the axial direction of the sliding ring body, so that the sliding auxiliary component is slidably connected to the outer circumferential surface of the mandrel 100.

[0081] Reference Figure 1 As shown, in some specific embodiments of this utility model, the mandrel 100 is made of a non-ferromagnetic material. It should be noted that non-ferromagnetic materials are a general term for materials that do not possess magnetism, such as most ceramic materials (except magnetic ceramics) and general non-ferrous metals (copper, aluminum, etc.).

[0082] Reference Figure 1 As shown, in some specific embodiments of this utility model, the microelectronic device according to the second aspect of this utility model includes: the vibration energy harvesting device of the first aspect embodiment. It is worth understanding that the microelectronic device can obtain continuous electrical energy through vibration, enabling it to operate efficiently for extended periods in a vibration environment, thus improving its battery life.

[0083] Specifically, microelectronic devices can include micro sensors, watches, and wristbands, with watches encompassing smartwatches, digital watches, and electronic watches. Furthermore, micro sensors can be applied in the tire industry or other mobile device fields.

[0084] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A vibration energy harvesting device, characterized in that, include: mandrel; A first magnetic element and a second magnetic element are respectively disposed at both ends of the mandrel, and at least a portion of the first magnetic element and at least a portion of the second magnetic element are located outside the outer peripheral surface of the mandrel. A coil is wound around the core shaft and disposed between the first magnetic element and the second magnetic element; A third magnetic element is disposed between the first magnetic element and the second magnetic element. The third magnetic element repels the first magnetic element and the second magnetic element. The third magnetic element is slidably sleeved on the outer peripheral surface of the mandrel.

2. The vibration energy harvesting device according to claim 1, characterized in that: The first magnetic component and / or the second magnetic component are detachably connected to the end of the mandrel.

3. The vibration energy harvesting device according to claim 2, characterized in that: The first magnetic element is sleeved on the mandrel, which includes a main shaft portion and a first limiting portion connected to one end of the main shaft portion. At least a portion of the first limiting portion is located outside the outer peripheral surface of the main shaft portion and blocks the end of the first magnetic element that is away from the second magnetic element.

4. The vibration energy harvesting device according to claim 3, characterized in that: The first limiting part and the main shaft part are connected as an integral structure.

5. The vibration energy harvesting device according to claim 3, characterized in that: The first limiting part is detachably connected to the main shaft part.

6. The vibration energy harvesting device according to claim 5, characterized in that: The outer peripheral surface of the main shaft is provided with a limiting hole. The first limiting part includes a connecting part and a stop limiting part. The connecting part is detachably connected to the limiting hole. The stop limiting part is located outside the outer peripheral surface of the main shaft and stops the end of the first magnetic component away from the second magnetic component. Alternatively, the outer peripheral surface of the main shaft is provided with an annular groove along the circumference of the main shaft, and the first limiting part is annularly engaged with the annular groove. A portion of the first limiting part is located outside the outer peripheral surface of the main shaft and blocks the end of the first magnetic element that is away from the second magnetic element.

7. The vibration energy harvesting device according to claim 1, characterized in that: The first magnetic component and / or the second magnetic component are connected to the mandrel as an integral structure.

8. The vibration energy harvesting device according to claim 1, characterized in that: The coil is positioned radially outside the third magnetic element along the core shaft.

9. The vibration energy harvesting device according to claim 8, characterized in that: The coil includes a coil layer and a curing layer connected to the coil layer, the curing layer being used to fix the coil layer.

10. The vibration energy harvesting device according to claim 9, characterized in that: The curing layer includes a first layer and a second layer, the first layer, the coil layer and the second layer are distributed sequentially along the radial direction of the mandrel, and the first layer and the second layer clamp and fix the coil layer. Alternatively, the cured layer and the coil layer may be connected as a single structure.

11. The vibration energy harvesting device according to claim 1, characterized in that: The coil is connected to the first magnetic component and / or the second magnetic component as an integral structure.

12. The vibration energy harvesting device according to claim 1, characterized in that: The diameter of the mandrel is Φ, the thickness of the mandrel is h, and the mandrel satisfies: 0mm < Φ ≤ 20mm, 0mm < h ≤ 40mm.

13. The vibration energy harvesting device according to claim 1, characterized in that: The third magnetic component includes a magnetic ring and a sliding auxiliary component disposed on the inner peripheral surface of the magnetic ring, the sliding auxiliary component being slidably connected to the outer peripheral surface of the mandrel.

14. The vibration energy harvesting device according to claim 1, characterized in that: The mandrel is made of a non-ferromagnetic material.

15. A microelectronic device, characterized in that, include: The vibration energy harvesting device according to any one of claims 1 to 14.

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