A multi-degree-of-freedom electromagnetic energy harvesting device and wireless electronic equipment

Abstract

This invention belongs to the field of vibration energy harvesting technology, and particularly relates to a multi-degree-of-freedom electromagnetic energy harvesting device and a wireless electronic device. The multi-degree-of-freedom electromagnetic energy harvesting device includes: a guide member, a magnetic absorbing member capable of generating a magnetic field, and a first coil located within the magnetic field. The guide member has a guiding surface, and the magnetic absorbing member is magnetically connected to the guide member at the guiding surface and can be suspended below the guide member. Under the action of external excitation, the guide member drives the magnetic absorbing member to move along the guiding surface, causing a change in the magnetic flux of the first coil. This invention changes the magnetic flux of the first coil by moving the magnetic absorbing member, thus efficiently converting mechanical energy into electrical energy. The magnetic absorbing member is magnetically connected to the guide member and can be suspended below the guide member in a stationary state, making the entire multi-degree-of-freedom electromagnetic energy harvesting device more compact and simple in structure, and possessing a certain degree of flexibility, adapting to various low-frequency vibration excitation environments.

Description

Technical Field

[0001] This invention belongs to the field of vibration energy harvesting technology, and particularly relates to a multi-degree-of-freedom electromagnetic energy harvesting device and a wireless electronic device. Background Technology

[0002] Currently, with the continuous development of science and technology, miniaturized and low-power electronic devices have gradually become a hot topic in research and development due to their convenience and high efficiency. These devices are widely used in various fields, such as wireless sensors, Internet of Things (IoT) technology, and wearable devices. However, providing these devices with a continuous and reliable power source remains a significant challenge. Traditional chemical batteries have many limitations in terms of battery life, cost, and environmental impact, prompting researchers and engineers to urgently seek new energy solutions to achieve a sustainable and more efficient energy supply.

[0003] Energy harvesting typically refers to the direct extraction of energy from the operating environment by small devices. This technology utilizes ambient energy, such as solar, wind, thermal, and mechanical energy, and converts it into electrical energy to power low-power electronic devices. Vibration energy, as a widely distributed and relatively stable renewable resource, is increasingly demonstrating its enormous development potential and wide range of applications. Among vibration energy harvesting technologies, electromagnetic energy harvesters have attracted considerable attention due to their simple structure, low impedance, and large output current. Summary of the Invention

[0004] The purpose of this application is to provide a multi-degree-of-freedom electromagnetic energy harvesting device, which aims to solve the problem of how to convert mechanical vibration energy into electrical energy.

[0005] To achieve the above objectives, the technical solution adopted in this application is as follows:

[0006] In a first aspect, a multi-degree-of-freedom electromagnetic energy harvesting device is provided, comprising: a guide member, a magnetic absorbing member capable of generating a magnetic field, and a first coil located within the magnetic field. The guide member has a guiding surface, and the magnetic absorbing member is magnetically connected to the guide member at the guiding surface and is capable of suspending below the guide member. Under the action of external excitation, the guide member drives the magnetic absorbing member to move along the guiding surface, thereby causing a change in the magnetic flux of the first coil.

[0007] In one embodiment, the guiding surface is spherical, and the magnetic attractor is cylindrical or spherical.

[0008] In one embodiment, the guide has a circular cross-section, the guide surface is located on the side surface of the guide, and the magnetic attractor is cylindrical or spherical.

[0009] In one embodiment, a positioning hole is provided at the center of the guide member, and the multi-degree-of-freedom electromagnetic energy harvesting device further includes a second coil located inside the positioning hole.

[0010] In one embodiment, the multi-degree-of-freedom electromagnetic energy harvesting device further includes a piezoelectric ring made of piezoelectric material, the piezoelectric ring being located in the positioning hole and between the guide and the second coil.

[0011] In one embodiment, multiple magnetic suction components are provided, and each magnetic suction component is connected to the other magnetically in sequence.

[0012] In one embodiment, multiple magnetic attractors are provided, each of which is magnetically connected to the guide member and is arranged at intervals along the circumference of the guide member, with any two adjacent magnetic attractors repelling each other magnetically.

[0013] In one embodiment, the multi-degree-of-freedom electromagnetic energy harvesting device further includes a frame structure with a accommodating cavity and a fixing bracket for fixing the guide member. The guide member, the magnetic suction member, and the first coil are all located in the accommodating cavity. Two fixing brackets are arranged, one end of each fixing bracket is connected to the inner wall of the accommodating cavity, and the other end of each fixing bracket is connected to the guide member.

[0014] In one embodiment, multiple first coils are arranged, each first coil being arranged around the circumference of the guide and spaced apart.

[0015] In a second aspect, a wireless electronic device is provided, which includes the multi-degree-of-freedom electromagnetic energy harvesting device.

[0016] The beneficial effects of this application are as follows: the multi-degree-of-freedom electromagnetic energy harvesting device can change the magnetic flux of the first coil by moving the magnetic suction component, and can efficiently convert mechanical energy into electrical energy. The magnetic suction component is magnetically connected to the guide component and can be suspended below the guide component when stationary, thereby making the structure of the entire multi-degree-of-freedom electromagnetic energy harvesting device more compact and simple, and having a certain degree of flexibility, adapting to various low-frequency vibration excitation environments. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or exemplary technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a three-dimensional structural schematic diagram of the multi-degree-of-freedom electromagnetic energy harvesting device provided in the embodiments of this application;

[0019] Figure 2 yes Figure 1 A schematic diagram of an explosion of a multi-degree-of-freedom electromagnetic energy harvesting device;

[0020] Figure 3 This is a cross-sectional schematic diagram of a multi-degree-of-freedom electromagnetic energy harvesting device in another embodiment of this application;

[0021] Figure 4 This is a cross-sectional schematic diagram of a multi-degree-of-freedom electromagnetic energy harvesting device according to another embodiment of this application;

[0022] Figure 5 This is a schematic diagram showing the connection between the guide and multiple magnetic components of a multi-degree-of-freedom electromagnetic energy harvesting device provided in another embodiment of this application;

[0023] Figure 6 This is a schematic diagram showing the connection between the guide and the magnetic suction component of a multi-degree-of-freedom electromagnetic energy harvesting device provided in another embodiment of this application;

[0024] Figure 7 This is a three-dimensional structural schematic diagram of a multi-degree-of-freedom electromagnetic energy harvesting device provided in another embodiment of this application.

[0025] The following are the labeling elements in the figure:

[0026] 100. Multi-degree-of-freedom electromagnetic energy harvesting device; 110. Frame structure; 101. Frame unit; 201. First coil; 202. Second coil; 301. Magnetic suction component; 401. Guide component; 402. Piezoelectric ring; 403. Guide surface; 103. Accommodating cavity; 102. Fixing bracket; 10. Support structure; 11. Support column; 12. Base plate; 404. Fixing sleeve; Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the scope of this application.

[0028] It should be noted that when a component is referred to as "fixed to" or "set on" another component, it can be directly or indirectly attached to that other component. When a component is referred to as "connected to" another component, it can be directly or indirectly connected to that other component. The terms "upper," "lower," "left," "right," etc., indicate orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, and are for ease of description only, not to 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 application. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances. The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features. "A plurality" means two or more, unless otherwise explicitly defined.

[0029] Please see Figures 1 to 3 This application provides a multi-degree-of-freedom electromagnetic energy harvesting device 100 and a wireless electronic device having the same. The multi-degree-of-freedom electromagnetic energy harvesting device 100 can convert the mechanical vibration energy of a vibration source into electrical energy to power electronic products, wherein the electronic products may be miniature sensors.

[0030] Please see Figures 1 to 3 The multi-degree-of-freedom electromagnetic energy harvesting device 100 includes: a guide member 401, a magnetic absorbing member 301 capable of generating a magnetic field, and a first coil 201 located within the magnetic field. Both the guide member 401 and the magnetic absorbing member 301 can be made of magnetic material, or the guide member 401 can be made of a metal material, such as iron, while the magnetic absorbing member 301 is made of a magnet. The guide member 401 can be magnetically connected to the magnetic absorbing member 301. The guide member 401 has a guiding surface 403, and the magnetic absorbing member 301 is magnetically connected to the guide member 401 at the guiding surface 403 and can be suspended below the guide member 401. That is, after the guide member 401 and the magnetic absorbing member 301 are magnetically connected, the guide member 401 remains stationary, and the magnetic absorbing member 301, under the action of gravity, can be magnetically connected and suspended below the guide member 401. At this time, the magnetic attraction between the guide member 401 and the magnetic absorbing member 301 is greater than or equal to the weight of the magnetic absorbing member 301.

[0031] Please see Figures 1 to 3Under the action of external excitation, such as mechanical vibration, the guide 401 transmits the vibration to the magnetic 301 and causes the magnetic 301 to move at the guide surface 403. The movement of the magnetic 301 can be a repeated swinging motion relative to the hovering position. During the continuous swinging process, the magnetic 301 not only rolls at the guide surface 403, but also changes the magnetic flux of the first coil 201. The changing magnetic flux can generate current in the first coil 201, thereby converting mechanical energy into electrical energy.

[0032] It is understood that the guide 401 and / or the magnetic attractor 301 can be a constant magnet, a permanent magnet, or a static magnet. There are no restrictions here, and the selection can be made according to the actual situation.

[0033] Please see Figures 1 to 3 The multi-degree-of-freedom electromagnetic energy harvesting device 100 provided in this application embodiment can change the magnetic flux of the first coil 201 by moving the magnetic suction member 301, and can efficiently utilize mechanical energy and convert it into electrical energy. The magnetic suction member 301 is magnetically connected to the guide member 401 and can be suspended below the guide member 401 when stationary, so that the structure of the entire multi-degree-of-freedom electromagnetic energy harvesting device 100 is more compact and simple, and has a certain degree of flexibility to adapt to various excitation conditions.

[0034] Optionally, the multi-degree-of-freedom electromagnetic energy harvesting device 100 provided in this application can adapt to various vibration environments. It can collect and convert vibration energy in low-frequency and random vibration environments, and has a relatively low resonant frequency, making it easy to effectively match the frequency of environmental vibration, and even resonate with low-frequency vibration environments. This improves the collection and harvesting of vibration energy, meeting the power requirements of low-power devices. Furthermore, the multi-degree-of-freedom electromagnetic energy harvesting device 100 provided in this application has a simple structure, high conversion efficiency, and the structural dimensions of the guide member 401 and the magnetic suction member 301 can be adjusted according to actual conditions.

[0035] Optionally, the multi-degree-of-freedom electromagnetic energy harvesting device 100, as a novel energy supply method, has broad application prospects. It can not only solve the problems of traditional chemical batteries, but also provide a continuous and stable power supply for miniaturized and low-power electronic products, promoting the development of electronic products towards a more environmentally friendly and efficient direction.

[0036] Please see Figures 1 to 3 In some embodiments, the guide surface 403 is spherical, and the magnetic attractor 301 is cylindrical or spherical.

[0037] Optionally, during the process of being excited by external vibration, the magnetic attractor 301 moves relative to the guide 401, and the guide surface 403 guides the magnetic attractor 301 to roll relative to the guide 401. The rolling friction is less than the sliding friction, so the multi-degree-of-freedom electromagnetic energy harvesting device 100 can have high sensitivity to vibration and can be used in various low-frequency vibration environments.

[0038] Please see Figure 4 The guide member 401 can be spherical, and the guide surface 403 with a spherical surface allows the magnetic attractant 301 to move in three-dimensional space, sensing mechanical vibrations in any direction, improving the sensitivity and flexibility of energy harvesting, and enabling it to adapt to random, wide-bandwidth, low-frequency, and small-amplitude vibration environments. The multi-degree-of-freedom electromagnetic energy harvesting device 100 has the advantages of wide response bandwidth, high sensitivity, simple structure, and high cost-effectiveness, enabling it to efficiently collect energy under various vibration environments and provide a continuous and stable power supply for low-power electronic products.

[0039] Please see Figures 1 to 3 It is understandable that the spherical or annular magnetic chuck 301 enables the magnetic chuck 301 and the guide 401 to make contact between their convex arc surfaces, thereby reducing the friction between the two surfaces, increasing the sensitivity to vibration, making the magnetic chuck 301 roll more smoothly and more easily on the guide surface, reducing friction loss and improving energy conversion efficiency.

[0040] In this embodiment, the magnetic 301 is circular in shape, and the side surface of the magnetic 301 is magnetically connected to the guide 401. In other embodiments, the magnetic 301 may also be spherical in shape. There is no limitation here, and the shape can be selected according to the actual situation.

[0041] Please see Figures 1 to 3 In some embodiments, the guide 401 has a circular cross-section, the guide surface 403 is located on the side surface of the guide 401, and the magnetic attractor 301 is cylindrical or spherical.

[0042] Optionally, the circumferential side surface of the circular structure of the guide member 401 can be used to guide the magnetic member 301, so that the magnetic member 301 can reciprocate along the guide surface 403, thereby achieving high-precision positioning and control and improving the stability of the system motion.

[0043] Optionally, the annular guide surface 403 provides a stable motion trajectory for the magnetic attractor 301, ensuring stable energy conversion of the system under excitation conditions. Furthermore, the circular structure is relatively simple, facilitating manufacturing and assembly, and is suitable for mass production.

[0044] It is understandable that when the vibration frequency of the external excitation is close to the resonant frequency of the device (which is a low frequency), even if the acceleration provided by the external excitation is small, the magnetic chuck 301 can still move or roll significantly along the guide surface 403. When the acceleration provided by the external excitation is below a certain threshold, the magnetic chuck 301 can also swing back and forth around its stationary hovering position, thus enabling the device to adapt to various vibration conditions and environments.

[0045] Please see Figures 1 to 3 In some embodiments, a positioning hole is provided at the center of the guide member 401, and the multi-degree-of-freedom electromagnetic energy harvesting device 100 also includes a second coil 202, which is located inside the positioning hole.

[0046] It is understandable that the guide 401 is circular and surrounds the second coil 202 circumferentially. When the magnetic suction member 301 rolls along the guide surface, the magnetic flux in the second coil 202 also changes, thereby generating an induced current in the second coil 202.

[0047] Please see Figures 1 to 3 Optionally, a positioning hole is provided at the center of the guide 401, and a second coil 202 is placed therein. This structure improves the energy conversion capability of the multi-degree-of-freedom electromagnetic energy harvesting device 100 by adding a second coil 202.

[0048] The guide 401 can be made of iron, which has a magnetic conductivity and can increase the magnetic flux in the second coil 202. This not only increases the sensing area of ​​the multi-degree-of-freedom electromagnetic energy harvesting device 100, but also increases the change in magnetic flux, thereby improving the energy harvesting efficiency and electrical energy output.

[0049] Optionally, by setting a second coil 202 in the positioning hole, the space of the guide 401 is fully utilized, enhancing the compactness and practicality of the multi-degree-of-freedom electromagnetic energy harvesting device 100.

[0050] Please see Figures 1 to 3 In some embodiments, the multi-degree-of-freedom electromagnetic energy harvesting device 100 further includes a piezoelectric ring 402 made of piezoelectric material, which is located in the positioning hole and between the guide 401 and the second coil 202, that is, between the hole wall of the positioning hole and the second coil 202.

[0051] Optionally, the piezoelectric ring 402 is made of ceramic piezoelectric material. When the magnetic attractor 301 rolls along the guide surface, the guide 401 will deform, thereby generating pressure on the piezoelectric ring 402 inside the guide 401. As the swing angle of the magnetic attractor 301 increases, the pressure on the guide 401 also increases, and the piezoelectric ring 402 undergoes mechanical changes accordingly. Its polarization intensity decreases, causing some of the charge attached to the surface of the ceramic piezoelectric ring 402 to be released, thereby generating an electric field.

[0052] Optionally, a piezoelectric ring 402 can be added inside the positioning hole to convert the mechanical stress borne by the guide member 401 into electrical energy, achieving multi-mode energy harvesting. Through the dual energy conversion mechanism of piezoelectric materials and electromagnetic induction, the multi-degree-of-freedom electromagnetic energy harvesting device 100 can simultaneously collect vibrational energy and magnetic energy, further improving energy conversion efficiency. Please refer to [link / reference]. Figures 1 to 3 In some embodiments, multiple magnetic attractors 301 are provided, and each magnetic attractor 301 is connected to the magnetic attractor in sequence. It can be understood that when in a static state, each magnetic attractor 301 is connected to the magnetic attractor in sequence along the vertical direction, thereby increasing the magnetic field strength of the first coil 201 and increasing the distribution range of the magnetic field, increasing the change of magnetic flux, and thus improving the energy conversion efficiency.

[0053] It is understood that the magnetic attractor 301 can be flat cylindrical or spherical. In this embodiment, the magnetic attractor 301 is flat cylindrical and there are two of them, and the guide member 401 is also flat cylindrical.

[0054] Please see Figure 6 In some embodiments, multiple magnetic attractors 301 are provided, each magnetic attractor 301 is magnetically connected to the guide member 401, and they are arranged at intervals along the circumference of the guide member 401. Along the circumference of the guide member 401, any two adjacent magnetic attractors 301 are magnetically repelled.

[0055] Please see Figure 6 Optionally, the guide member 401 is a flat cylindrical shape and is fixedly installed, and the magnetic attractor 301 is also a flat cylindrical shape. The cross-sectional shape of both the guide member 401 and the magnetic attractor 301 is circular. Each magnetic attractor 301 is arranged at intervals along the circumference of the guide member 401, that is, each magnetic attractor 301 is arranged at intervals on the guide surface 403. The magnetic repulsion between any two adjacent magnetic attractors 301 is achieved. After the external excitation is transmitted to the guide member 401, each magnetic attractor 301 rolls sequentially along the guide surface 403.

[0056] Avoiding magnetic interference: The magnetic repulsion design ensures that adjacent magnetic components 301 move independently along the guide surface 403, avoiding mutual interference and improving the stability and efficiency of the system.

[0057] Uniform distribution of magnetic attracting elements 301: The circumferentially spaced magnetic attracting elements 301 make the magnetic field distribution more uniform, which helps to improve the generation efficiency of induced current.

[0058] Please see Figures 1 to 3 In some embodiments, multiple first coils 201 are arranged, each first coil 201 is arranged around the circumference of the guide member 401 and at intervals.

[0059] Optionally, the multi-degree-of-freedom electromagnetic energy harvesting device 100 has multiple first coils 201 spaced apart on the circumference of the guide member 401, which can increase the magnetic flux variation area and thus improve energy output.

[0060] Please see Figures 1 to 3 The arrangement of multiple first coils 201 further expands the magnetic field coverage, enabling more magnetic flux changes to be captured, improving the energy conversion efficiency of the device, and also enabling magnetic field changes to generate induced current over a larger area, thus making it suitable for energy capture scenarios with a larger area.

[0061] Please see Figures 1 to 3 In some embodiments, the multi-degree-of-freedom electromagnetic energy harvesting device 100 further includes a frame structure 110 with a receiving cavity 103 and a fixing bracket 102 for fixing the guide member 401. The guide member 401, the magnetic suction member 301 and the first coil 201 are all located in the receiving cavity 103. Two fixing brackets 102 are arranged. One end of each fixing bracket 102 is connected to the inner wall of the receiving cavity 103, and the other end of each fixing bracket 102 is connected to the guide member 401.

[0062] Please see Figures 1 to 3 Optionally, the frame structure 110 includes two frame units 101, and two fixed supports 102 connect the two frame units 101 respectively. The two frame units 101 are mated to form a receiving cavity 103. The guide member 401 is also made of magnetic material or metal material and is circular. The metal material can be iron. The two frame units 101 are connected by bolts. The guide member 401 is precisely positioned and clamped at the central axis of the two frame units 101, ensuring that the central axis of the guide member 401 coincides with the central axis of the two left and right frames. This achieves axial alignment of the guide member 401 structure and securely embeds it between the two fixed supports 102.

[0063] Please see Figure 3 and Figure 4Optionally, the end face of the fixed bracket 102 is also provided with a fixed sleeve 404, the second coil 202 is disposed inside the fixed sleeve 404, the piezoelectric ring 402 and the guide member 401 are sequentially sleeved on the fixed sleeve 404. By setting the fixed sleeve 404, radial support can be provided for the guide member 401 and the piezoelectric ring 402, and the second coil 202 and the guide member 401 are radially restricted, so as to avoid excessive deformation of the piezoelectric ring 402, the guide member 401 and the second coil 202 in the radial direction when the magnetic attractor 301 moves around the guide member 401 in the circumferential direction, thereby improving reliability.

[0064] It is understandable that both fixed brackets 102 are equipped with fixed sleeves 404, please refer to [link / reference]. Figures 1 to 3 Each of the two frame units 101 is provided with a plurality of first coils 201, and each first coil 201 is arranged in a circle around the guide member 401 and at intervals.

[0065] Please see Figures 1 to 3 Two magnetic attractors 301 are provided, and the guide 401 and the two magnetic attractors 301 are arranged from top to bottom as magnet A, magnet B, and magnet C. The central axes of the two magnetic attractors 301 are parallel to the central axis of the guide 401, and the north pole (N pole) of magnet B is aligned with the south pole (S pole) of magnet A, and the south pole (S pole) of magnet B is also aligned with the north pole (N pole) of magnet A. Similarly, the configuration of magnet B and magnet C is the same as that of magnet B and magnet A, that is, the central axes of magnet B and magnet C are parallel, and the corresponding north and south poles are aligned with each other. In this configuration, due to the mutual attraction between the magnetic poles, the ring side of magnet B is tightly magnetically attracted and attached to the ring side of magnet A, and at the same time, the ring side of magnet B is also tightly magnetically attracted and attached to the ring side of magnet C, so that the side contact of the three is tangential.

[0066] Meanwhile, the thickness of magnet A is greater than that of magnet B, and the thickness of magnet A is also greater than that of magnet C. This allows magnet A to have a sufficient thickness area to be clamped and fixed by the fixing bracket 102, and the width of the exposed guide surface 403 of magnet A is slightly greater than the thickness of magnets B and C, so that magnet B can roll along the guide surface 403.

[0067] Please see Figures 1 to 3 Under the action of external excitation, the frame structure 110 drives the magnet A to perform linear or rotational motion. Due to inertia, the magnet B, which is attracted to the magnet A, performs pure rolling motion around the magnet A and on the guide surface 403. At the same time, the magnet C, which is magnetically connected to the magnet B, also performs pure rolling motion around the magnet B. The motion of the magnet B and the magnet C changes the magnetic flux of each first coil 201 and second coil 202, so that each first coil 201 and second coil 202 can generate induced current.

[0068] Alternatively, depending on the external excitation conditions, magnet B can perform a simple pendulum motion or a complete circular motion to further improve the output.

[0069] Please see Figures 1 to 3 Optionally, the number and structure of magnetic components 301 can be added arbitrarily, and the number of turns, size and position of the first coil 201 and the second coil 202 can be changed to further increase the output.

[0070] Please see Figure 5 Optionally, when both the guide member 401 and the magnetic attractor 301 are spherical, the guide member 401 is fixed to the top of the frame structure 110, and the guide member 401 is a sphere with a cavity. The second coil 202 is located in the cavity of the guide member 401, and each magnetic attractor 301 is connected in sequence. At the same time, the volume of each magnetic attractor 301 increases from top to bottom. In this way, not only can the rolling of each magnetic attractor 301 change the magnetic flux of the first coil 201, but also, since the bottom magnetic attractor 301 has the largest volume, the frame structure 110 has the function of a damper. The frame structure 110 can be kept stable simply by placing it on the vibrating equipment without any additional auxiliary connections, which improves the convenience of frame installation.

[0071] This application provides a multi-degree-of-freedom electromagnetic energy harvesting device 100. By constructing a multi-degree-of-freedom system and allowing the magnetic accumulator 301 to roll purely relative to the guide member 401, low-frequency vibration energy in the environment is converted into rotational kinetic energy of the magnetic accumulator 301, and an induced current is generated in the first coil 201, thereby outputting electrical energy. This solves the problem of the complex structure of rotary electromagnetic energy harvesters, which are difficult to adapt to the needs of small devices. The multi-degree-of-freedom electromagnetic energy harvesting device 100 of this application widens the operating frequency bandwidth of the energy harvester, simplifies the structure of the energy harvester, and makes it suitable for low-frequency vibration responses.

[0072] The frame structure 110 in this embodiment can be placed under the following three excitation conditions:

[0073] First, when torque excitation is provided, the multi-degree-of-freedom electromagnetic energy harvesting device 100 is made to rotate around the Z-axis (or an axis parallel to the Z-axis) (eccentric rotational motion).

[0074] Secondly, it simultaneously provides displacement excitation and torque excitation, so that the motion of the multi-degree-of-freedom electromagnetic energy harvesting device 100 is pure rolling motion, such as the movement of a car, bicycle or any wheeled vehicle on a flat road.

[0075] Third, please refer to Figure 7When a displacement excitation is provided to the frame structure 110, the frame structure 110 is supported by the support structure 10. The support structure 10 includes a base plate 12 and two support columns 11 arranged on the base plate 12. The two support columns 11 are connected to the two sides of the frame structure 110 by connectors. The motion state of the frame structure 110 is consistent with that of the support structure 10. When a sinusoidal excitation is applied to the vibration table for external excitation, the through holes on the base plate 12 are provided with bolts, and the device is fixed to the vibration table by the bolts.

[0076] The present invention also proposes a wireless electronic device, which includes a multi-degree-of-freedom electromagnetic energy harvesting device 100. The specific structure of the multi-degree-of-freedom electromagnetic energy harvesting device 100 is as described in the above embodiments. Since the present wireless electronic device adopts all the technical solutions of all the above embodiments, it also has all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0077] In some embodiments, the wireless electronic device also includes electronic products, which may be miniature sensors. The multi-degree-of-freedom electromagnetic energy harvesting device 100 can power the miniature sensors without the need for an external power source, thereby increasing the autonomy and ease of use of the device.

[0078] The above are merely optional embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A multi-degree-of-freedom electromagnetic energy harvesting device, characterized in that, include: The system includes a guide member, a magnetic suction member capable of generating a magnetic field, and a first coil located within the magnetic field. The guide member has a guiding surface, and the magnetic suction member is magnetically connected to the guide member at the guiding surface and can be suspended below the guide member. Under the action of external excitation, the guide member drives the magnetic suction member to move along the guiding surface, causing a change in the magnetic flux of the first coil. The guiding surface is spherical, and the magnetic attractor is cylindrical or spherical; The guide member has a circular cross-section, and the guide surface is located on the side surface of the guide member; The guide member has a positioning hole at its center, and the multi-degree-of-freedom electromagnetic energy harvesting device also includes a second coil, which is located inside the positioning hole. The multi-degree-of-freedom electromagnetic energy harvesting device also includes a piezoelectric ring made of piezoelectric material, which is located in the positioning hole and between the guide and the second coil; The multi-degree-of-freedom electromagnetic energy harvesting device further includes a frame structure with a accommodating cavity and a fixing bracket for fixing the guide member. The guide member, the magnetic suction member, and the first coil are all located in the accommodating cavity. Two fixing brackets are arranged, one end of each fixing bracket is connected to the inner wall of the accommodating cavity, and the other end of each fixing bracket is connected to the guide member.

2. The multi-degree-of-freedom electromagnetic energy harvesting device as described in claim 1, characterized in that: Multiple magnetic suction components are provided, and each magnetic suction component is connected to the other magnetically in sequence.

3. The multi-degree-of-freedom electromagnetic energy harvesting device as described in claim 1, characterized in that: Multiple magnetic attractors are provided, each of which is magnetically connected to the guide member and is arranged at intervals along the circumference of the guide member. Any two adjacent magnetic attractors are magnetically repelled.

4. The multi-degree-of-freedom electromagnetic energy harvesting device as described in any one of claims 1-3, characterized in that: Multiple first coils are arranged, and each first coil is arranged around the circumference of the guide member at intervals.

5. A wireless electronic device, characterized in that, Includes the multi-degree-of-freedom electromagnetic energy harvesting device as described in any one of claims 1-4.

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