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

Abstract

The invention belongs to the technical field of vibration energy harvesting, and particularly relates to a multi-degree-of-freedom electromagnetic energy harvesting device and wireless electronic equipment. The multi-degree-of-freedom electromagnetic energy harvesting device comprises a guiding piece, a magnetic attraction piece capable of generating a magnetic field and a first coil located in the magnetic field, the guiding piece is provided with a guiding face, and the magnetic attraction piece is connected with the guiding piece at the guiding face in a magnetic attraction mode and can hover below the guiding piece; under the action of external excitation, the guide piece drives the magnetic attraction piece to move along the guide face, and the magnetic flux of the first coil is changed. The magnetic flux of the first coil is changed through movement of the magnetic attraction piece, and mechanical energy can be efficiently converted into electric energy. The magnetic attraction part is connected with the guide part through magnetic attraction and can hover below the guide part in a static state, so that the whole multi-degree-of-freedom electromagnetic energy harvesting device is more compact and simpler in structure, has certain flexibility and is suitable for various low-frequency vibration excitation environments.

Description

Technical Field

[0001] The invention belongs to the technical field of vibration energy harvesting, and in particular relates to a multi-degree-of-freedom electromagnetic energy harvesting device and a wireless electronic device. Background Art

[0002] At present, with the continuous development of science and technology, miniaturized and low-power electronic devices have gradually become a hot spot in the field of 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 technology, wearable devices, etc. However, providing continuous and reliable energy for these devices remains a major challenge. Traditional chemical batteries have many limitations in terms of battery life, cost, and impact on the environment, which has prompted researchers and engineers to urgently look for new energy solutions to achieve sustainable and more efficient energy supply.

[0003] Energy harvesting usually refers to small devices directly capturing energy from their working environment. This technology uses energy in the surrounding environment, such as solar energy, wind energy, thermal energy and mechanical energy, to convert it into electrical energy to power low-power electronic devices. As a widely distributed and relatively stable renewable resource, vibration energy is gradually showing its huge development space and wide application possibilities. In vibration energy harvesting technology, electromagnetic energy harvesters have attracted much attention due to their simple structure, low impedance and large output current. Summary of the invention

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

[0005] To achieve the above purpose, the technical solution adopted in this application is: In a first aspect, a multi-degree-of-freedom electromagnetic energy capture device is provided, comprising: a guide member, a magnetic member capable of generating a magnetic field, and a first coil located in the magnetic field, wherein the guide member has a guide surface, the magnetic member is magnetically connected to the guide member at the guide surface, and can hover under the guide member; wherein, under the action of external excitation, the guide member drives the magnetic member to move along the guide surface and causes the magnetic flux of the first coil to change.

[0006] In one embodiment, the guide surface is spherical, and the magnetic attraction member is cylindrical or spherical.

[0007] In one embodiment, the cross section of the guide member is circular, the guide surface is located on the side surface of the guide member, and the magnetic attraction member is cylindrical or spherical.

[0008] In one embodiment, a positioning hole is opened at the center of the guide member, and the multi-degree-of-freedom electromagnetic energy capture device also includes a second coil, and the second coil is located in the positioning hole.

[0009] In one embodiment, the multi-degree-of-freedom electromagnetic energy capture device further includes a piezoelectric ring made of piezoelectric material, and the piezoelectric ring is located in the positioning hole and between the guide member and the second coil.

[0010] In one embodiment, a plurality of magnetic elements are provided, and the magnetic elements are magnetically connected in sequence.

[0011] In one embodiment, a plurality of magnetic members are provided, each of which is magnetically connected to the guide member and arranged at intervals along the circumference of the guide member, and any two adjacent magnetic members magnetically repel each other.

[0012] In one embodiment, the multi-degree-of-freedom electromagnetic energy capture device also includes a frame structure having a accommodating cavity and a fixed bracket for fixing the guide member, the guide member, the magnetic attraction member and the first coil are all located in the accommodating cavity, two fixed brackets are arranged, one end of the two fixed brackets is connected to the inner wall of the accommodating cavity, and the other end of the two fixed brackets is connected to the guide member.

[0013] In one embodiment, a plurality of the first coils are arranged, and each of the first coils is arranged around the circumference of the guide member and at intervals.

[0014] According to a second aspect, a wireless electronic device is provided, which includes the multi-degree-of-freedom electromagnetic energy harvesting device.

[0015] The beneficial effect of the present application is that the multi-degree-of-freedom electromagnetic energy capture device can change the magnetic flux of the first coil by moving the magnetic suction member, and can efficiently convert mechanical energy into electrical energy. The magnetic suction member is connected to the guide member by magnetic suction, and can hover under the guide member when in a stationary state, so that the structure of the entire multi-degree-of-freedom electromagnetic energy capture device is more compact, simple, and has a certain degree of flexibility, and is adaptable to a variety of low-frequency vibration excitation environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or exemplary technical descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is a schematic diagram of the three-dimensional structure of a multi-degree-of-freedom electromagnetic energy harvesting device provided in an embodiment of the present application; Figure 2 yes Figure 1 Explosion diagram of a multi-degree-of-freedom electromagnetic energy harvesting device; Figure 3 is a cross-sectional schematic diagram of a multi-degree-of-freedom electromagnetic energy harvesting device in yet another embodiment of the present application; Figure 4 is a cross-sectional schematic diagram of a multi-degree-of-freedom electromagnetic energy harvesting device in another embodiment of the present application; Figure 5 This is a schematic diagram of the connection between a guide member and a plurality of magnetic suction members of a multi-degree-of-freedom electromagnetic energy capture device provided in yet another embodiment of the present application; Figure 6 This is a schematic diagram of the connection between the guide member and the magnetic attraction member of the multi-degree-of-freedom electromagnetic energy capture device provided by another embodiment of the present application; Figure 7 It is a schematic diagram of the three-dimensional structure of a multi-degree-of-freedom electromagnetic energy harvesting device provided in yet another embodiment of the present application.

[0018] Among them, the reference numerals in the figure are: 100, multi-degree-of-freedom electromagnetic energy capture device; 110, frame structure; 101, frame unit; 201, first coil; 202, second coil; 301, magnetic attraction member; 401, guide member; 402, piezoelectric ring; 403, guide surface; 103, accommodating cavity; 102, fixed bracket; 10, support structure; 11, support column; 12, bottom plate; 404, fixed sleeve; DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present application.

[0020] It should be noted that when a component is referred to as being "fixed on" or "disposed on" another component, it may be directly on the other component or indirectly on the other component. When a component is referred to as being "connected to" another component, it may be directly or indirectly connected to the other component. The orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances. The terms "first" and "second" are only used for the purpose of convenience of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features. The meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0021] See also Figures 1 to 3 The embodiment of the present 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 micro sensors.

[0022] See also Figures 1 to 3 The multi-degree-of-freedom electromagnetic energy capture device 100 includes: a guide member 401, a magnetic member 301 capable of generating a magnetic field, and a first coil 201 located in the magnetic field. The guide member 401 and the magnetic member 301 can both be made of magnetic materials, or the guide member 401 is made of a metal material, such as metal iron, and the magnetic member 301 is made of a magnet, and the guide member 401 can be magnetically connected to the magnetic member 301. The guide member 401 has a guide surface 403, and the magnetic member 301 is magnetically connected to the guide member 401 at the guide surface 403, and can be suspended below the guide member 401; that is, after the guide member 401 and the magnetic member 301 are magnetically connected, the guide member 401 remains stationary, and the magnetic member 301 can be magnetically connected and suspended below the guide member 401 under the action of gravity, and at this time, the magnetic attraction between the guide member 401 and the magnetic member 301 is greater than or equal to the gravity of the magnetic member 301.

[0023] See also Figures 1 to 3 , wherein, under the action of external excitation, the external excitation can be mechanical vibration, the guide member 401 transmits the vibration to the magnetic member 301, and drives the magnetic member 301 to move at the guide surface 403, and the movement of the magnetic member 301 can be repeated swinging relative to the hovering position, and the magnetic member 301 not only rolls at the guide surface 403 during the continuous swinging process, but also can change the magnetic flux of the first coil 201, and the changing magnetic flux can generate current in the first coil 201, thereby converting mechanical energy into electrical energy.

[0024] It is understandable that the guide member 401 and / or the magnetic attraction member 301 can be a permanent magnet, a permanent magnet or a static magnet, which is not limited here and can be selected according to actual conditions.

[0025] See also Figures 1 to 3 The multi-degree-of-freedom electromagnetic energy capture device 100 provided in the embodiment of the present application can change the magnetic flux of the first coil 201 by moving the magnetic member 301, and can efficiently utilize mechanical energy and convert it into electrical energy. The magnetic member 301 is connected to the guide member 401 by magnetic attraction, and can hover under the guide member 401 when in a stationary state, so that the structure of the entire multi-degree-of-freedom electromagnetic energy capture device 100 is more compact and simple, and has a certain degree of flexibility to adapt to various excitation conditions.

[0026] Optionally, the multi-degree-of-freedom electromagnetic energy capture device 100 provided in the present 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, which is easy to effectively match the frequency of environmental vibrations, and even resonate with low-frequency vibration environments. Thereby improving the collection and collection of vibration energy, the power requirements of low-power devices can be met. Moreover, the multi-degree-of-freedom electromagnetic energy capture device 100 provided in the present application has a simple structure and 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.

[0027] Optionally, the multi-degree-of-freedom electromagnetic energy harvesting device 100 has broad application prospects as a new energy supply method. It can not only solve the problems of traditional chemical batteries, but also provide continuous and stable power for miniaturized and low-power electronic products, and promote the development of electronic products in a more environmentally friendly and efficient direction.

[0028] See also Figures 1 to 3 In some embodiments, the guide surface 403 is spherical, and the magnetic element 301 is cylindrical or spherical.

[0029] Optionally, during the process of being stimulated by external vibration, the magnetic element 301 moves relative to the guide element 401, and the guide surface 403 guides the magnetic element 301 to roll relative to the guide element 401, and the rolling friction force is smaller than the sliding friction force, so that the multi-degree-of-freedom electromagnetic energy capture device 100 can have a high sensitivity to vibration and can be suitable for various low-frequency vibration environments.

[0030] See also Figure 4 The guide member 401 can be spherical, and the guide surface 403 set on the spherical surface allows the magnetic member 301 to move in three-dimensional space, and can sense mechanical vibrations in any direction, thereby improving the sensitivity and flexibility of energy capture, and being able to adapt to random, wide-band, low-frequency and small-amplitude vibration environments. The multi-degree-of-freedom electromagnetic energy capture device 100 has the advantages of wide response bandwidth, high sensitivity, simple structure and high cost-effectiveness, so that it can efficiently collect energy in a variety of vibration environments and provide a continuous and stable power supply for low-power electronic products.

[0031] See also Figures 1 to 3 It can be understood that the spherical or annular magnetic component 301 can make the convex arc surface contact between the magnetic component 301 and the guide component 401, thereby reducing the friction between the two surfaces, improving the sensitivity of vibration, and making the magnetic component 301 roll on the guide surface more smoothly and easier to roll, reducing friction loss and improving energy conversion efficiency.

[0032] In the embodiment of the present application, the shape of the magnetic member 301 is circular, and the side surface of the magnetic member 301 is magnetically connected to the guide member 401. In other embodiments, the shape of the magnetic member 301 can also be spherical. There is no limitation here and it can be selected according to actual conditions.

[0033] See also Figures 1 to 3 In some embodiments, the cross section of the guide member 401 is circular, the guide surface 403 is located on the side surface of the guide member 401, and the magnetic member 301 is cylindrical or spherical.

[0034] 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 move back and forth along the guide surface 403, thereby achieving high-precision positioning and control and improving the stability of the system movement.

[0035] Optionally, the annular guide surface 403 provides a stable motion trajectory for the magnetic element 301, ensuring stable energy conversion of the system under excitation conditions. The circular structure is relatively simple, easy to manufacture and assemble, and suitable for mass production.

[0036] It is understandable that when the vibration frequency of the external excitation is close to the resonant frequency of the device (the resonant frequency of the device is low frequency), even if the acceleration provided by the external excitation is small, the magnetic member 301 can move or roll significantly along the guide surface 403. When the acceleration provided by the external excitation is below a certain threshold, the magnetic member 301 can also swing back and forth with its suspended position in a static state as the center, so that the device can adapt to a variety of different vibration conditions and vibration environments.

[0037] See also Figures 1 to 3 In some embodiments, a positioning hole is opened at the center of the guide member 401, and the multi-degree-of-freedom electromagnetic energy capture device 100 further includes a second coil 202, and the second coil 202 is located in the positioning hole.

[0038] It is understandable that the guide member 401 is in a circular shape and surrounds the second coil 202 along the circumference of the second coil 202. When the magnetic attraction member 301 rolls along the guide surface, the magnetic flux in the second coil 202 also changes simultaneously, thereby generating an induced current in the second coil 202.

[0039] See also Figures 1 to 3 Optionally, a positioning hole is opened at the center of the guide member 401, and the second coil 202 is placed therein. This structure improves the energy conversion capability of the multi-degree-of-freedom electromagnetic energy capture device 100 by adding the second coil 202.

[0040] The material of the guide member 401 can be metal iron. Metal iron has magnetic conductivity and can increase the magnetic flux in the second coil 202. It can not only increase the induction area of ​​the multi-degree-of-freedom electromagnetic energy capture device 100, but also increase the magnetic flux change, thereby improving the energy capture efficiency and power output.

[0041] Optionally, by arranging the second coil 202 in the positioning hole, the space of the guide member 401 is fully utilized, thereby enhancing the compactness and practicality of the multi-degree-of-freedom electromagnetic energy harvesting device 100.

[0042] See also Figures 1 to 3 In some embodiments, the multi-degree-of-freedom electromagnetic energy capture device 100 further includes a piezoelectric ring 402 made of piezoelectric material. The piezoelectric ring 402 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 .

[0043] Optionally, the material of the piezoelectric ring 402 is a ceramic piezoelectric material. When the magnetic element 301 rolls along the guide surface, the guide element 401 will be deformed, thereby generating pressure on the piezoelectric ring 402 inside the guide element 401. As the swing angle of the magnetic element 301 increases, the pressure on the guide element 401 also increases, and the piezoelectric ring 402 undergoes mechanical changes, and its polarization strength decreases, so that a portion of the charge attached to the surface of the ceramic piezoelectric ring 402 is released, thereby generating an electric field.

[0044] Optionally, a piezoelectric ring 402 is added to the positioning hole to convert the mechanical stress of the guide member 401 into electrical energy, thereby realizing multi-mode energy capture. Through the dual energy conversion mechanism of piezoelectric material and electromagnetic induction, the multi-degree-of-freedom electromagnetic energy capture device 100 can collect vibration energy and magnetic energy at the same time, further improving the energy conversion efficiency. Figures 1 to 3 In some embodiments, a plurality of magnetic members 301 are provided, and the magnetic members 301 are magnetically connected in sequence. It can be understood that, in a stationary state, the magnetic members 301 are magnetically connected in sequence along a 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.

[0045] It is understandable that the shape of the magnetic member 301 can be a flat cylindrical shape or a spherical shape. In this embodiment, the magnetic member 301 is a flat cylindrical shape and two are provided, and the shape of the guide member 401 is also a flat cylindrical shape.

[0046] See also Figure 6 In some embodiments, a plurality of magnetic members 301 are provided, each magnetic member 301 is magnetically connected to the guide member 401, and is arranged at intervals along the circumference of the guide member 401. Along the circumference of the guide member 401, any two adjacent magnetic members 301 magnetically repel each other.

[0047] See also Figure 6 Optionally, the guide member 401 is in a flat cylindrical shape and is fixedly arranged, and the magnetic member 301 is also in a flat cylindrical shape. The cross-sectional shapes of the guide member 401 and the magnetic member 301 are both circular, and the magnetic members 301 are arranged at intervals along the circumference of the guide member 401, that is, the magnetic members 301 are arranged at intervals on the guide surface 403. The magnetism between any two adjacent magnetic members 301 repels each other. After the external excitation is transmitted to the guide member 401, the magnetic members 301 roll in sequence along the guide surface 403.

[0048] Avoiding magnetic interference: The magnetic repulsion design ensures the independent movement of adjacent magnetic elements 301 along the guide surface 403, avoiding mutual interference and improving the stability and efficiency of the system.

[0049] Uniform distribution of magnetic elements 301: The circumferentially spaced magnetic elements 301 make the magnetic field distribution more uniform, which helps to improve the efficiency of generating induced current.

[0050] See also Figures 1 to 3 In some embodiments, a plurality of first coils 201 are arranged, and each first coil 201 is arranged around the circumference of the guide member 401 and at intervals.

[0051] Optionally, the multi-degree-of-freedom electromagnetic energy capture device 100 arranges a plurality of first coils 201 at intervals on the circumference of the guide member 401, which can increase the magnetic flux change area, thereby improving energy output.

[0052] See also Figures 1 to 3 The arrangement of multiple first coils 201 further expands the magnetic field coverage, allowing more magnetic flux changes to be captured, improving the energy conversion efficiency of the device, and allowing magnetic field changes to generate induced currents in a larger range, thereby being suitable for energy capture scenarios over a larger area.

[0053] See also Figures 1 to 3 In some embodiments, the multi-degree-of-freedom electromagnetic energy capture device 100 also includes a frame structure 110 having a accommodating cavity 103 and a fixed bracket 102 for fixing a guide member 401. The guide member 401, the magnetic member 301 and the first coil 201 are all located in the accommodating cavity 103. Two fixed brackets 102 are arranged, one end of the two fixed brackets 102 is connected to the inner wall of the accommodating cavity 103, and the other end of the two fixed brackets 102 is connected to the guide member 401.

[0054] See also Figures 1 to 3Optionally, the frame structure 110 includes two frame units 101, two fixed brackets 102 are respectively connected to the two frame units 101, the two frame units 101 are butted to form a receiving cavity 103, and the guide member 401 is also made of a magnetic material or a metal material and is circular, and the metal material can be metal iron. The two frame units 101 are connected by bolt fastening, and the guide member 401 is precisely positioned and clamped at the central axis position 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, thereby achieving axial centering in the guide member 401 structure and firmly embedded between the two fixed brackets 102.

[0055] See also Figure 3 and Figure 4 Optionally, a fixing sleeve 404 is further provided on the end surface of the fixing bracket 102, and the second coil 202 is arranged in the fixing sleeve 404, and the piezoelectric ring 402 and the guide member 401 are sequentially sheathed on the fixing sleeve 404. By setting the fixing sleeve 404, radial support can be provided to the guide member 401 and the piezoelectric ring 402, and the second coil 202 and the guide member 401 have a radial restriction, 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 attraction member 301 moves circumferentially around the guide member 401, thereby improving reliability.

[0056] It is understandable that both fixing brackets 102 are provided with fixing sleeves 404, see Figures 1 to 3 A plurality of first coils 201 are disposed in both frame units 101 , and each first coil 201 is arranged circumferentially and at intervals around the guide member 401 .

[0057] See also Figures 1 to 3 , two magnetic members 301 are provided, and the guide member 401 and the two magnetic members 301 are set as magnet A, magnet B and magnet C from top to bottom. The central axis of the two magnetic members 301 is arranged in parallel with the central axis of the guide member 401, and the north pole (N pole) of magnet B is arranged in the same direction as the south pole (S pole) of magnet A, and the south pole (S pole) of magnet B is arranged in the same direction as the north pole (N pole) of magnet A. Similarly, the configuration of magnet B and magnet C is the same as the configuration of magnet B and magnet A, that is, the central axes of magnet B and magnet C are arranged in parallel, and the corresponding north poles and south poles are arranged in the same direction. Under this configuration, due to the mutual attraction between the magnetic poles, the ring side of magnet B is tightly magnetically attached to the ring side of magnet A, and at the same time, the ring side of magnet B is also tightly magnetically attached to the ring side of magnet C, so that the side contacts of the three are all in a tangent state.

[0058] At the same time, 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, so that magnet A has a sufficient thickness area to be clamped and fixed by the fixing bracket 102, and the width of the guide surface 403 exposed to the outside of magnet A can be slightly greater than the thickness of magnets B and C, so that magnet B can roll along the guide surface 403.

[0059] See also Figures 1 to 3 Under the action of external excitation, the frame structure 110 drives the magnet A to perform linear motion or rotational motion. Due to the effect of inertia, the magnet B attracted to the magnet A rotates around the magnet A and performs pure rolling motion on the guide surface 403, and the magnet C magnetically connected to the magnet B also performs pure rolling motion around the magnet B at the same time. The movement of the magnet B and the magnet C changes the magnetic flux of each first coil 201 and the second coil 202, so that each first coil 201 and the second coil 202 can generate an induced current.

[0060] Optionally, depending on the external excitation conditions, the magnet B can perform a simple pendulum motion, or a complete circular motion, to further increase the output.

[0061] See also Figures 1 to 3 Optionally, the number and structure of the magnetic elements 301 can be arbitrarily increased, and the number of turns, size and position of the first coil 201 and the second coil 202 can also be changed to further increase the output.

[0062] See also Figure 5 Optionally, when the guide member 401 and the magnetic member 301 are both 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 the magnetic members 301 are connected in sequence, and the volume of each magnetic member 301 increases from top to bottom. In this way, not only can the rolling of each magnetic member 301 change the magnetic flux of the first coil 201, but also because the volume of the bottom magnetic member 301 is the largest, the frame structure 110 has the function of a damper, and the frame structure 110 only needs to be placed on the vibration equipment without more auxiliary connections, so that the frame structure 110 can remain stable, thereby improving the convenience of installing the frame body.

[0063] The embodiment of the present application provides a multi-degree-of-freedom electromagnetic energy harvesting device 100, which converts low-frequency vibration energy in the environment into rotational kinetic energy of the magnetic member 301 by constructing a multi-degree-of-freedom system and making the magnetic member 301 perform pure rolling relative to the guide member 401, and makes the first coil 201 generate an induced current, thereby outputting electrical energy, thereby solving the problem that the rotating electromagnetic energy harvester has a complex structure and is difficult to adapt to the needs of small devices. The multi-degree-of-freedom electromagnetic energy harvesting device 100 of the present application widens the operating frequency bandwidth of the energy harvester, simplifies the structure of the energy harvester, and makes it suitable for responding to low-frequency vibrations.

[0064] The frame structure 110 in the embodiment of the present application can be placed in the following three excitation conditions when used: First, when torque excitation is provided, the multi-degree-of-freedom electromagnetic energy capture device 100 is made to perform rotational motion (eccentric rotational motion) around the Z axis (or an axis parallel to the Z axis).

[0065] Second, displacement excitation and torque excitation are provided simultaneously, so that the motion form of the multi-degree-of-freedom electromagnetic energy capture device 100 is pure rolling motion, such as a car, a bicycle or any vehicle with wheels running on a flat road.

[0066] Third, please refer to Figure 7 , when providing displacement excitation to the frame structure 110, the frame structure 110 can be 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 sides of the frame structure 110 are respectively connected to the two support columns 11 by connecting pieces, the motion state of the frame structure 110 is consistent with the support structure 10, when the vibration table applies sinusoidal excitation for external excitation, bolts are provided in the through holes on the base plate 12, and the device is fixed to the vibration table by the bolts.

[0067] 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 refers to the above embodiment. Since this wireless electronic device adopts all the technical solutions of all the above embodiments, it also has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here one by one.

[0068] In some embodiments, the wireless electronic device also includes an electronic product, which may be a micro sensor. The multi-degree-of-freedom electromagnetic energy capture device 100 can supply power to the micro sensor without an external power supply, thereby increasing the autonomy and ease of use of the device.

[0069] The above are only optional embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A multi-degree-of-freedom electromagnetic energy harvesting device, characterized in that: include: A guide member, a magnetic member capable of generating a magnetic field, and a first coil located in the magnetic field, wherein the guide member has a guide surface, the magnetic member is magnetically connected to the guide member at the guide surface, and can hover below the guide member; wherein, under the action of external excitation, the guide member drives the magnetic member to move along the guide surface and causes the magnetic flux of the first coil to change.

2. The multi-degree-of-freedom electromagnetic energy harvesting device according to claim 1, characterized in that: The guide surface is spherical, and the magnetic attraction component is cylindrical or spherical.

3. The multi-degree-of-freedom electromagnetic energy harvesting device according to claim 1, characterized in that: The cross section of the guide member is circular, the guide surface is located on the side surface of the guide member, and the magnetic attraction member is cylindrical or spherical.

4. The multi-degree-of-freedom electromagnetic energy harvesting device according to claim 3, characterized in that: A positioning hole is provided at the center of the guide member, and the multi-degree-of-freedom electromagnetic energy capture device further includes a second coil, which is located in the positioning hole.

5. The multi-degree-of-freedom electromagnetic energy harvesting device according to claim 4, characterized in that: The multi-degree-of-freedom electromagnetic energy capture device also includes a piezoelectric ring made of piezoelectric material, and the piezoelectric ring is located in the positioning hole and between the guide member and the second coil.

6. The multi-degree-of-freedom electromagnetic energy harvesting device according to any one of claims 1 to 5, characterized in that: A plurality of magnetic attracting parts are provided, and each of the magnetic attracting parts is magnetically connected in sequence.

7. The multi-degree-of-freedom electromagnetic energy harvesting device according to any one of claims 3 to 5, characterized in that: A plurality of magnetic attracting members are provided, each of the magnetic attracting members is magnetically connected to the guide member, and is arranged at intervals along the circumference of the guide member, and any two adjacent magnetic attracting members magnetically repel each other.

8. The multi-degree-of-freedom electromagnetic energy harvesting device according to any one of claims 1 to 5, characterized in that: The multi-degree-of-freedom electromagnetic energy capture device also includes a frame structure with a accommodating cavity and a fixed bracket for fixing the guide member, the guide member, the magnetic attraction member and the first coil are all located in the accommodating cavity, two fixed brackets are arranged, one end of the two fixed brackets is connected to the inner wall of the accommodating cavity, and the other end of the two fixed brackets is connected to the guide member.

9. The multi-degree-of-freedom electromagnetic energy harvesting device according to any one of claims 1 to 5, characterized in that: A plurality of the first coils are arranged, and each of the first coils is arranged around the circumference of the guide member and at intervals.

10. A wireless electronic device, characterized in that: It comprises a multi-degree-of-freedom electromagnetic energy harvesting device as described in any one of claims 1-9.

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