Differential dual-output electromagnetic vibration energy harvesting device

Abstract

The invention discloses a differential type dual-output electromagnetic vibration energy harvesting device which is characterized in that a vibration mechanism comprises a magnetic conductive framework, a first annular magnet and a second annular magnet, an induction mechanism comprises a first annular induction coil and a second annular induction coil, and the magnetic conductive framework is connected to the middle of the inner side of an outer shell through an elastic connecting mechanism; the two sides, in the axial direction, of the magnetic conduction framework are symmetrically sunken to form a first annular installation groove and a second annular installation groove which are separated from each other, the first annular magnet is fixedly arranged on the inner groove wall of the first annular installation groove in a sleeving mode, and the first annular induction coil is fixedly arranged at one end of the outer shell and extends into the first annular installation groove. The second annular magnet is fixedly arranged on the inner groove wall of the second annular mounting groove in a sleeving manner; the second annular induction coil is fixedly arranged at the other end of the outer shell and extends into the second annular mounting groove; the differential type double-output power generation device has the advantage that electric energy can be efficiently provided in a differential type double-output mode.

Description

Technical Field

[0001] The invention relates to an electromagnetic vibration energy harvesting device, in particular to a differential dual-output electromagnetic vibration energy harvesting device. Background Art

[0002] Effectively converting the vibration energy widely present in the environment into electrical energy is one of the most promising and promising technical solutions in the field of self-powered technology. Vibration energy capture can be divided into piezoelectric, electromagnetic, and electrostatic types. Among them, electromagnetic vibration energy capture has the advantages of small size, low cost, and high output power, and has received widespread attention in recent years. Its working principle is: environmental vibration drives the spring to cause relative displacement between the magnet and the coil. According to Faraday's law of electromagnetic induction, the magnetic flux of the closed circuit in the magnetic field changes, and the coil in the circuit generates an AC induced electromotive force.

[0003] A Chinese invention patent with application number CN202210246852.3 discloses a differential electromagnetic vibration energy capture device, which is provided with an annular groove on the bottom plate, and the inner rolling ball rolls in the annular groove after induction vibration, driving the bar limit groove and the elliptical track to move relative to each other, so that the coil cuts the magnetic flux lines to generate electrical energy. The energy capture device transmits vibration energy through the multi-directional rolling of the ball and has the characteristics of differential dual output; however, the energy capture device contains a large unused space inside, resulting in low space utilization, which in turn makes the output power density of the energy capture device relatively small.

[0004] The Chinese invention patent with application number CN202311619741.3 discloses an electromagnetic vibration energy harvester based on radial magnetization. The device uses a composite magnet with spring guide sleeves installed at both ends. The composite magnet reciprocates along the guide rod as the object vibrates, so that the coil cuts the magnetic flux lines to generate electrical energy. The energy capture device has high internal space utilization, and at the same time, the magnetic induction intensity near the coil is increased by shortening the magnetic circuit, which greatly increases the power density of the energy capture device. However, the output mode of the energy capture device is single output, which limits its flexibility and applicability, such as when rapid energy capture or large-capacity energy capture is required. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a differential dual-output electromagnetic vibration energy harvesting device with a simple overall structure and high energy harvesting power density, which can convert vibration energy into electrical energy output in the form of differential dual output, and the energy harvesting process is relatively fast and flexible.

[0006] The technical solution adopted by the present invention to solve the above technical problems is: a differential dual-output electromagnetic vibration energy capture device, including an outer shell, a vibration mechanism and an induction mechanism, the vibration mechanism includes a magnetic skeleton, a first annular magnet and a second annular magnet, the induction mechanism includes a first annular induction coil and a second annular induction coil, both ends of which extend out of the outer shell, the magnetic skeleton is connected to the inner middle part of the outer shell by an elastic connection mechanism along the axial direction elastic vibration, the magnetic skeleton is symmetrically recessed on both sides along the axial direction to form a first annular mounting groove and a second annular mounting groove separated from each other, the first annular magnet is fixedly sleeved on the inner groove wall of the first annular mounting groove and the magnetization direction is radial, the first annular induction coil is fixedly set at one end of the outer shell and extends into the first annular mounting groove in a non-contact manner, the second annular magnet is fixedly sleeved on the inner groove wall of the second annular mounting groove and the magnetization direction is radial, and the second annular induction coil is fixedly set at the other end of the outer shell and extends into the second annular mounting groove in a non-contact manner.

[0007] Compared with the prior art, the advantages of the present invention are that the magnetic skeleton is connected to the inner middle part of the outer shell by an elastic connection mechanism along the axial elastic vibration. When vibrating, the magnetic skeleton drives the first annular magnet and the second annular magnet to cut the corresponding first annular induction coil and the second annular induction coil respectively, thereby generating two differential AC voltages and outputting them from the ends of the first annular induction coil and the second annular induction coil to the outside of the outer shell respectively, completing the energy capture process of converting vibration energy into electrical energy. The differential dual-output characteristics of the device give the device obvious advantages in output power, power supply speed and power supply efficiency. At the same time, the device has good flexibility and applicability, and can more conveniently meet the needs when rapid energy capture or large-capacity energy capture is required. In addition, the overall device has a simple and compact structure, and fully utilizes the internal space of the device to design various structures. The magnetization direction of the first annular magnet and the second annular magnet is radial, which can generate a more uniform magnetic field compared with axial magnetization, while shortening the magnetic circuit length and reducing energy loss; by combining the magnetic conductive skeleton with magnetic conductivity and the radially magnetized first annular magnet with the second annular magnet, the magnetic circuit structure is closed, the leakage of magnetic lines of force is reduced, and the energy capture efficiency of the overall device is improved.

[0008] Preferably, the first annular induction coil is fixedly connected to one end of the outer shell through a first coil support, the first coil support is fixed to one end of the outer shell through a first mounting screw and a first mounting nut, the second annular induction coil is fixedly connected to the other end of the outer shell through a second coil support, the second coil support is fixed to the other end of the outer shell through a second mounting screw and a second mounting nut, so as to facilitate installation of the first annular induction coil and the second annular induction coil, as well as maintenance, replacement or adjustment after disassembly.

[0009] Preferably, the height of the first annular magnet is smaller than the height of the inner groove wall of the first annular mounting groove, and the height of the second annular magnet is smaller than the height of the inner groove wall of the second annular mounting groove, so as to ensure that the first annular magnet and the second annular magnet will not directly collide with the first coil support and the second coil support during vibration, causing structural changes or damage.

[0010] Preferably, the elastic connection mechanism includes a first plane spring, a second plane spring and a spring washer, wherein the first plane spring is elastically connected between the outer side of the magnetic skeleton and the inner wall of the outer shell and is perpendicular to the axial direction of the magnetic skeleton when stationary, the second plane spring is elastically connected between the outer side of the magnetic skeleton and the inner wall of the outer shell and is perpendicular to the axial direction of the magnetic skeleton when stationary, and the spring washer is fixedly clamped between the outer layer of the first plane spring and the outer layer of the second plane spring. The design of the first plane spring and the second plane spring greatly reduces the structural space inside the overall device and increases the power density of the overall device. At the same time, the first plane spring and the second plane spring are both perpendicular to the axial direction of the magnetic skeleton. The two parallel plane springs make the vibration of the vibration mechanism more stable, always maintain axial vibration, prevent the vibration mechanism from tilting and deviating, and avoid the problem of the vibration mechanism colliding with the first annular induction coil and the second annular induction coil in fixed position when vibrating.

[0011] Preferably, the first planar spring comprises a first inner ring located in the inner layer, a first outer ring located in the outer layer, and at least three first elastic S-shaped connecting arms uniformly distributed along the circumferential direction and elastically connected between the first inner ring and the first outer ring, a mounting ring is fixedly arranged around the middle part of the outer side of the magnetic conductive skeleton, the first inner ring is fixedly connected to one side of the mounting ring, the first outer ring is fixedly connected to the inner wall of the outer shell, the first elastic S-shaped connecting arm comprises a first inner connecting section, a first middle connecting section and a first outer connecting section, the first inner connecting section is bent inwardly and arranged at one end of the first middle connecting section and fixedly connected to the first inner ring, the first outer connecting section is bent outwardly and arranged at the other end of the first middle connecting section and fixedly connected to the first outer ring, and the first middle connecting section is located in the gap between the first inner ring and the first outer ring; The second planar spring includes a second inner ring located in the inner layer, a second outer ring located in the outer layer, and at least three second elastic S-shaped connecting arms evenly distributed along the circumferential direction and elastically connected between the second inner ring and the second outer ring. The second inner ring is fixedly connected to the other side of the mounting ring, and the second outer ring is fixedly connected to the inner wall of the outer shell. The second elastic S-shaped connecting arm includes a second inner connecting section, a second middle connecting section and a second outer connecting section. The second inner connecting section is bent inwardly and arranged at one end of the second middle connecting section and fixedly connected to the second inner ring. The second outer connecting section is bent outwardly and arranged at the other end of the second middle connecting section and fixedly connected to the second outer ring. The second middle connecting section is located in the gap between the second inner ring and the second outer ring. The spring washer is fixedly clamped between the first outer ring and the second outer ring. Through the structural design of the first planar spring and the second planar spring, the elastic vibration connection of the magnetic skeleton is effectively achieved to the inner middle part of the outer shell, wherein the evenly distributed structure of the first elastic S-shaped connecting arm and the second elastic S-shaped connecting arm not only plays the role of elastic connection, but also plays the role of limiting the movement of the magnetic skeleton in the radial direction, thereby preventing the magnetic skeleton from tilting and deviating during vibration.

[0012] Preferably, the first inner ring, the mounting ring and the second inner ring are connected by at least three evenly distributed inner connection screws, which pass through the first inner ring, the mounting ring and the second inner ring in sequence and are fixed to the other side of the second inner ring by means of inner connection nuts. This fixed connection method is only one form of the existing common fixed connection structure, and the fixed connection can also be achieved by other conventional fixing methods, such as welding, clamping or bonding.

[0013] Preferably, the outer shell includes a first cylindrical shell and a second cylindrical shell symmetrically arranged, the first cylindrical shell and the second cylindrical shell are both semi-closed structures and have openings facing each other, the inner side of the end surface of the opening of the first cylindrical shell is recessed to form a first annular step surface, the inner side of the end surface of the opening of the second cylindrical shell is recessed to form a second annular step surface, the first outer ring, the spring washer and the second outer ring are all embedded in the gap between the first annular step surface and the second annular step surface, at least six first long through holes axially penetrated are circumferentially distributed inside the side wall of the first cylindrical shell, the inner end opening of the first long through hole is located on the first annular step surface, the second long through holes corresponding in number and position to the first long through holes are axially penetrated inside the side wall of the second cylindrical shell, the The inner end opening of the second long through hole is located on the second annular step surface, the first outer ring is provided with a first external connecting hole whose number and position correspond to the first long through hole, the second outer ring is provided with a second external connecting hole whose number and position correspond to the second long through hole, the spring washer is provided with a washer positioning hole whose number and position correspond to the first long through hole, the first cylindrical shell and the second cylindrical shell are fixedly connected by screwing and locking between a number of connecting long screws corresponding to the first long through hole and corresponding external connecting nuts, the connecting long screw extends from one end of the first cylindrical shell and passes through the first long through hole, the first external connecting hole, the washer positioning hole, the second external connecting hole and the second long through hole in sequence, and is locked and fixed with the external connecting nut to the other end of the second cylindrical shell. The first cylindrical shell and the second cylindrical shell are symmetrically arranged relative to each other. During installation, the first outer ring, the spring washer and the second outer ring can be easily embedded in the gap between the first annular step surface and the second annular step surface, and fixed by connecting long screws. When fixing, the long connecting screws pass through the first long through hole, the first external connecting hole, the washer positioning hole, the second external connecting hole and the second long through hole in sequence to lock the positions of various internal structures. After the external connecting nut locks and fixes the long connecting screws, the spring washer is fixedly clamped between the first outer ring and the second outer ring to ensure that the outer layers of the first planar spring and the second planar spring are fixed. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the external structure of the first embodiment; Figure 2 It is a partial structural cross-sectional view of the first embodiment; Figure 3 It is a partial structural diagram of embodiment 1; Figure 4 It is a structural explosion diagram of the second embodiment; Figure 5 It is an assembly diagram of a part of the structure of the second embodiment; Figure 6 is a schematic structural diagram of the first plane spring in the second embodiment; Figure 7 A simulated magnetic field distribution diagram of the device using the second embodiment; Figure 8 This is an output voltage waveform diagram of the device of Example 1 in Embodiment 2.

[0015] Description of reference numerals: 1. outer shell; 11. first cylindrical shell; 12. second cylindrical shell; 13. first annular step surface; 14. second annular step surface; 15. first long through hole; 16. second long through hole; 2. Magnetic framework; 21. First annular magnet; 22. Second annular magnet; 23. Mounting ring; 24. First annular mounting groove; 25. Second annular mounting groove; 31. first annular induction coil; 32. second annular induction coil; 33. first coil support; 34. first mounting screw; 35. first mounting nut; 36. second coil support; 37. second mounting screw; 38. second mounting nut; 41. Spring washer; 411. Washer positioning hole; 42. First inner ring; 43. First outer ring; 431. First outer connecting hole; 44. First elastic S-shaped connecting arm; 441. First inner connecting section; 442. First middle connecting section; 443. First outer connecting section; 45. Second inner ring; 46. Second outer ring; 461. Second outer connecting hole; 47. Second elastic S-shaped connecting arm; 471. Second inner connecting section; 472. Second middle connecting section; 473. Second outer connecting section; 48. Internal connecting screw; 49. Internal connecting nut; 51. Long connecting screw; 52. External connecting nut. DETAILED DESCRIPTION

[0016] The present invention is further described in detail below with reference to the accompanying drawings.

[0017] Embodiment 1: Figure 1~Figure 3As shown, a differential dual-output electromagnetic vibration energy capture device includes an outer shell 1, a vibration mechanism and an induction mechanism, the vibration mechanism includes a magnetic conductive skeleton 2, a first annular magnet 21 and a second annular magnet 22, the induction mechanism includes a first annular induction coil 31 and a second annular induction coil 32, both ends of which extend out of the outer shell 1, the first annular induction coil 31 is fixedly connected to one end of the outer shell 1 through a first coil support 33, the first coil support 33 is fixed to one end of the outer shell 1 through the cooperation and locking between a first mounting screw 34 and a first mounting nut 35, the second annular induction coil 32 is fixedly connected to the other end of the outer shell 1 through a second coil support 36, and the second coil support 36 is fixedly connected to the other end of the outer shell 1 through a second coil support 36. The first coil support 33 and the second coil support 36 are arranged to facilitate the installation of the first annular induction coil 31 and the second annular induction coil 32, as well as maintenance, replacement or adjustment after disassembly; the magnetic skeleton 2 is connected to the middle part of the inner side of the outer shell 1 by an elastic connection mechanism along the axial elastic vibration, and the elastic connection mechanism includes a first planar spring, a second planar spring and a spring washer 41, the first planar spring is elastically connected between the outer side of the magnetic skeleton 2 and the inner wall of the outer shell 1 and is perpendicular to the axial direction of the magnetic skeleton 2 when stationary, and the second planar spring is elastically connected to the magnetic skeleton 2. The first planar spring comprises a first inner ring 42 located in the inner layer, a first outer ring 43 located in the outer layer, and three first elastic S-shaped connecting arms 44 uniformly distributed along the circumferential direction and elastically connected between the first inner ring 42 and the first outer ring 43. A mounting ring 23 is fixedly arranged around the middle part of the outer side of the magnetic skeleton 2. The mounting ring 23 is formed by integrally molding with the magnetic skeleton 2, or it can be formed separately and clamped in the middle part of the outer side of the magnetic skeleton 2. The first inner ring 42 is fixedly connected to one side of the mounting ring 23, and the first outer ring 43 is fixedly connected to the inner wall of the outer shell 1. The second planar spring comprises a first inner ring 42 located in the inner layer, a first outer ring 43 located in the outer layer, and three first elastic S-shaped connecting arms 44 uniformly distributed along the circumferential direction and elastically connected between the first inner ring 42 and the first outer ring 43. A mounting ring 23 is fixedly arranged around the middle part of the outer side of the magnetic skeleton 2. The mounting ring 23 is formed by integrally molding with the magnetic skeleton 2, or it can be formed separately and clamped in the middle part of the outer side of the magnetic skeleton 2. The first inner ring 42 is fixedly connected to one side of the mounting ring 23, and the first outer ring 43 is fixedly connected to the inner wall of the outer shell 1. The second inner ring 45, the second outer ring 46 located in the outer layer, and three second elastic S-shaped connecting arms 47 uniformly distributed along the circumferential direction and elastically connected between the second inner ring 45 and the second outer ring 46, the second inner ring 45 is fixedly connected to the other side of the mounting ring 23, the second outer ring 46 is fixedly connected to the inner wall of the outer shell 1, the first inner ring 42, the mounting ring 23 and the second inner ring 45 are connected by three uniformly distributed inner connecting screws 48, the inner connecting screws 48 pass through the first inner ring 42, the mounting ring 23 and the second inner ring 45 in turn and are locked and fixed to the other side of the second inner ring 45 by the inner connecting nut 49, and the spring washer 41 is fixedly clamped and arranged between the first outer ring 43 and the second outer ring 46. Among them, the number of the first elastic S-shaped connecting arm 44, the second elastic S-shaped connecting arm 47 and the inner connecting screw 48 can be designed to be more than three according to actual needs.

[0018] The two sides of the magnetic conductive skeleton 2 along the axial direction are symmetrically recessed to form a first annular mounting groove 24 and a second annular mounting groove 25 separated from each other. The first annular magnet 21 is fixedly sleeved on the inner groove wall of the first annular mounting groove 24 and the magnetization direction is radial. The first annular induction coil 31 is fixedly arranged at one end of the outer shell 1 and extends into the first annular mounting groove 24 in a non-contact manner. The second annular magnet 22 is fixedly sleeved on the inner groove wall of the second annular mounting groove 25 and the magnetization direction is radial. The second annular induction coil 32 is fixedly arranged at the other end of the outer shell 1 and extends into the second annular mounting groove 25 in a non-contact manner. The height of the first annular magnet 21 is less than the height of the inner groove wall of the first annular mounting groove 24, and the height of the second annular magnet 22 is less than the height of the inner groove wall of the second annular mounting groove 25, so as to ensure that the first annular magnet 21 and the second annular magnet 22 will not directly collide with the first coil support 33 and the second coil support 36 during the vibration process, causing structural changes or damage. The magnetization direction of the first annular magnet 21 and the second annular magnet 22 is radial, which can produce a more uniform magnetic field compared with axial magnetization, while shortening the magnetic circuit length and reducing energy loss; by combining the magnetic conductive skeleton 2 with magnetic conductivity and the radially magnetized first annular magnet 21 and the second annular magnet 22, the magnetic circuit structure is closed, the leakage of magnetic lines of force is reduced, and the energy capture efficiency of the overall device is improved.

[0019] The outer shell 1 includes a first cylindrical shell 11 and a second cylindrical shell 12 which are symmetrically arranged. The first cylindrical shell 11 and the second cylindrical shell 12 are both semi-closed structures and their openings are opposite. The inner side of the end surface at the opening of the first cylindrical shell 11 is recessed to form a first annular step surface 13, and the inner side of the end surface at the opening of the second cylindrical shell 12 is recessed to form a second annular step surface 14. The first outer ring 43, the spring washer 41 and the second outer ring 46 are all embedded in the gap between the first annular step surface 13 and the second annular step surface 14. Six first long through holes 15 which are axially penetrated are circumferentially distributed inside the side wall of the first cylindrical shell 11. The inner end opening of the first long through hole 15 is located on the first annular step surface 13. The inner side wall of the second cylindrical shell 12 is axially penetrated with second long through holes 16 whose number and position correspond to the first long through holes 15. The second long through holes The inner end opening of 16 is located on the second annular step surface 14, the first outer ring 43 is provided with first external connection holes 431 corresponding in number and position to the first long through hole 15, the second outer ring 46 is provided with second external connection holes 461 corresponding in number and position to the second long through hole 16, the spring washer 41 is provided with washer positioning holes 411 corresponding in number and position to the first long through hole 15, the first cylindrical shell 11 and the second cylindrical shell 12 are connected and fixed by screwing and locking between connecting long screws 51 corresponding in number to the first long through hole 15 and corresponding external connection nuts 52, the connecting long screws 51 extend from one end of the first cylindrical shell 11 and pass through the first long through hole 15, the first external connection hole 431, the washer positioning hole 411, the second external connection hole 461 and the second long through hole 16 in sequence, and are locked and fixed to the other end of the second cylindrical shell 12 with the external connection nut 52. Among them, the number of the first long through holes 15 is designed to be six or more according to actual needs.

[0020] The first cylindrical shell 11 and the second cylindrical shell 12 are arranged relative to each other in a symmetrical form. During installation, the first outer ring 43, the spring washer 41 and the second outer ring 46 can be easily embedded in the gap between the first annular step surface 13 and the second annular step surface 14, and fixed by the connecting long screw 51. When fixing, the connecting long screw 51 passes through the first long through hole 15, the first external connection hole 431, the washer positioning hole 411, the second external connection hole 461 and the second long through hole 16 in sequence to lock the position of each internal structure. After the external connecting nut 52 locks the connecting long screw 51, the spring washer 41 is fixedly clamped between the first outer ring 43 and the second outer ring 46 to ensure that the outer layer of the first planar spring and the second planar spring is fixed.

[0021] The working principle of the above embodiment 1 is as follows: The magnetic skeleton 2 is connected to the inner middle part of the outer shell 1 by an elastic connection mechanism along the axial elastic vibration, with the equilibrium position as the reference plane. When vibrating, the magnetic skeleton 2 drives the first annular magnet 21 to move toward the reference plane, while the second annular magnet 22 moves away from the reference plane, thereby forming two differential alternating magnetic fields. The first annular induction coil 31 and the second annular induction coil 32 are respectively fixed at the two ends of the outer shell 1. The moving first annular magnet 21 and the second annular magnet 22 respectively cut the corresponding first annular induction coil 31 and the second annular induction coil 32, thereby generating two differential AC voltages and outputting them from the ends of the first annular induction coil 31 and the second annular induction coil 32 to the outside of the outer shell 1, completing the energy capture process of converting vibration energy into electrical energy.

[0022] Embodiment 2: Figure 4~Figure 6 As shown, the rest of the parts are the same as those in Example 1, except that the first elastic S-shaped connecting arm 44 includes a first inner connecting segment 441, a first middle connecting segment 442 and a first outer connecting segment 443, the first inner connecting segment 441 is bent inwardly and arranged at one end of the first middle connecting segment 442 and fixedly connected to the first inner ring 42, the first outer connecting segment 443 is bent outwardly and arranged at the other end of the first middle connecting segment 442 and fixedly connected to the first outer ring 43, and the first middle connecting segment 442 is located in the gap between the first inner ring 42 and the first outer ring 43; the second elastic S-shaped connecting arm 47 includes a second inner connecting segment 471, a second middle connecting segment 472 and a second outer connecting segment 473, the second inner connecting segment 471 is bent inwardly and arranged at one end of the second middle connecting segment 472 and fixedly connected to the second inner ring 45, the second outer connecting segment 473 is bent outwardly and arranged at the other end of the second middle connecting segment 472 and fixedly connected to the second outer ring 46, and the second middle connecting segment 472 is located in the gap between the second inner ring 45 and the second outer ring 46. The structure of the evenly distributed first elastic S-shaped connecting arm 44 and the second elastic S-shaped connecting arm 47 not only plays the role of elastic connection, but also plays the role of limiting the movement of the magnetic skeleton 2 in the radial direction, thereby preventing the magnetic skeleton 2 from tilting and deviating during vibration.

[0023] Figure 7 The figure shows the magnetic field distribution after the magnetic conductive skeleton 2, the first annular magnet 21 and the second annular magnet 22 are fixedly connected, which is simulated on the COMSOL software platform. It can be clearly seen that the magnetic lines of force between the gaps are evenly and densely distributed, which effectively shortens the magnetic circuit. The coil can vertically cut the magnetic lines of force, thereby maximizing the output effect of electromagnetic induction.

[0024] Example 1: Figure 8The figure shows the waveform of the output voltage induced by the first annular induction coil 31 and the second annular induction coil 32 when the differential dual-output electromagnetic energy harvesting device tested in the experiment is in motion. The amplitude of the dual-output voltage waveform is equal and has a phase difference of exactly 180 degrees. In this example 1, the basic parameters of the device are: the axial length of the first cylindrical shell 11 and the second cylindrical shell 12 is 22mm, the outer diameter is 52mm, and the external volume of the first cylindrical shell 11 and the second cylindrical shell 12 is 93.4cm 3 The wire diameters of the first annular induction coil 31 and the second annular induction coil 32 are both 0.2 mm, the coil internal resistances of the first annular induction coil 31 and the second annular induction coil 32 are both 23.8 Ω, the number of coil turns of the first annular induction coil 31 and the second annular induction coil 32 are both 520, and the resonance frequencies of the first annular induction coil 31 and the second annular induction coil 32 are both 76.05 Hz. 2 The maximum open circuit voltage of the output is 3.3V. The measured output power is the largest when the load is 200Ω, which is 7.5*2mW. The power density can reach 1.78mW / cm 3 / g 2 Compared with the power density of electromagnetic energy harvesting devices of domestic and foreign researchers, it is at the leading level. For example, in the paper "Leicht J, Manoli Y. A 2.6μW–1.2mW Autonomous Electromagnetic Vibration Energy HarvesterInterface IC with Conduction-Angle-Controlled MPPT and up to 95% Efficiency[J]. IEEE Journal of Solid-State Circuits, 2017, 52(9): 2448-2462" published by Joachim Leicht et al. in 2017, the power density of the electromagnetic energy harvesting device can reach a maximum of 0.06mW / cm 3 / g 2 ; In the paper published by Sun Jianchao et al. in 2022, "Sun Jianchao, Zhou Qiang, Wei Tianliu, et al. Research and design of high-efficiency vibration-electromagnetic energy harvester based on vertical motion magnets [J]. Foreign Electronic Measurement Technology, 2022, 41(11): 78-87.", the power density of the electromagnetic energy harvesting device is: 0.96mW / cm 3; In the paper published by Hou et al. in 2024, “Hou X, et al. Electromagnetic Energy Harvester Based on Bidirectional Vibration to Unidirectional Rotation Conversion for Environmental Low-Frequency Vibration Energy Harvesting[J]. IEEE Transactions on Power Electronics, 2024, 39(2): 1932-1941.”, the power density of the electromagnetic energy harvesting device is: 0.56mW / cm 3 / g 2 ; This shows that the differential dual-output electromagnetic vibration energy capture device of Example 1 has a high power density, can achieve dual-output induced voltages with opposite phases and the same amplitude, and has good dual-output characteristics.

Claims

1. A differential dual-output electromagnetic vibration energy harvesting device, characterized in that It includes an outer shell, a vibration mechanism and an induction mechanism, the vibration mechanism includes a magnetic skeleton, a first annular magnet and a second annular magnet, the induction mechanism includes a first annular induction coil and a second annular induction coil, both ends of which extend out of the outer shell, the magnetic skeleton is connected to the inner middle part of the outer shell by an elastic connection mechanism along the axial direction of elastic vibration, the magnetic skeleton is symmetrically recessed on both sides along the axial direction to form a first annular mounting groove and a second annular mounting groove separated from each other, the first annular magnet is fixedly sleeved on the inner groove wall of the first annular mounting groove and the magnetization direction is radial, the first annular induction coil is fixedly set at one end of the outer shell and extends into the first annular mounting groove in a non-contact manner, the second annular magnet is fixedly sleeved on the inner groove wall of the second annular mounting groove and the magnetization direction is radial, and the second annular induction coil is fixedly set at the other end of the outer shell and extends into the second annular mounting groove in a non-contact manner.

2. A differential dual-output electromagnetic vibration energy harvesting device according to claim 1, characterized in that The first annular induction coil is fixedly connected to one end of the outer shell through a first coil bracket, and the first coil bracket is fixed to one end of the outer shell through the cooperation and locking between a first mounting screw and a first mounting nut. The second annular induction coil is fixedly connected to the other end of the outer shell through a second coil bracket, and the second coil bracket is fixed to the other end of the outer shell through the cooperation and locking between a second mounting screw and a second mounting nut.

3. A differential dual-output electromagnetic vibration energy harvesting device according to claim 2, characterized in that The height of the first annular magnet is smaller than the height of the inner groove wall of the first annular mounting groove, and the height of the second annular magnet is smaller than the height of the inner groove wall of the second annular mounting groove.

4. A differential dual-output electromagnetic vibration energy harvesting device according to claim 1, characterized in that The elastic connection mechanism includes a first planar spring, a second planar spring and a spring washer. The first planar spring is elastically connected between the outer side of the magnetic conductive skeleton and the inner wall of the outer shell and is perpendicular to the axial direction of the magnetic conductive skeleton when stationary. The second planar spring is elastically connected between the outer side of the magnetic conductive skeleton and the inner wall of the outer shell and is perpendicular to the axial direction of the magnetic conductive skeleton when stationary. The spring washer is fixedly clamped between the outer layer of the first planar spring and the outer layer of the second planar spring.

5. A differential dual-output electromagnetic vibration energy harvesting device according to claim 4, characterized in that The first planar spring comprises a first inner ring located in the inner layer, a first outer ring located in the outer layer, and at least three first elastic S-shaped connecting arms uniformly distributed along the circumferential direction and elastically connected between the first inner ring and the first outer ring. A mounting ring is fixedly arranged around the middle part of the outer side of the magnetic conductive skeleton. The first inner ring is fixedly connected to one side of the mounting ring, and the first outer ring is fixedly connected to the inner wall of the outer shell. The first elastic S-shaped connecting arm comprises a first inner connecting section, a first middle connecting section and a first outer connecting section. The first inner connecting section is bent inwardly and arranged at one end of the first middle connecting section and fixedly connected to the first inner ring. The first outer connecting section is bent outwardly and arranged at the other end of the first middle connecting section and fixedly connected to the first outer ring. The first middle connecting section is located in the gap between the first inner ring and the first outer ring. The second planar spring comprises a second inner ring located in the inner layer, a second outer ring located in the outer layer, and at least three second elastic S-shaped connecting arms uniformly distributed along the circumferential direction and elastically connected between the second inner ring and the second outer ring, the second inner ring is fixedly connected to the other side of the mounting ring, the second outer ring is fixedly connected to the inner wall of the outer shell, the second elastic S-shaped connecting arm comprises a second inner connecting section, a second middle connecting section and a second outer connecting section, the second inner connecting section is bent inwardly and arranged at one end of the second middle connecting section and fixedly connected to the second inner ring, the second outer connecting section is bent outwardly and arranged at the other end of the second middle connecting section and fixedly connected to the second outer ring, and the second middle connecting section is located in the gap between the second inner ring and the second outer ring; The spring washer is fixedly clamped between the first outer ring and the second outer ring.

6. A differential dual-output electromagnetic vibration energy harvesting device according to claim 5, characterized in that The first inner ring, the mounting ring and the second inner ring are connected by at least three evenly distributed internal connecting screws, and the internal connecting screws pass through the first inner ring, the mounting ring and the second inner ring in sequence and are locked and fixed to the other side of the second inner ring by internal connecting nuts.

7. A differential dual-output electromagnetic vibration energy harvesting device according to claim 5, characterized in that The outer shell comprises a first cylindrical shell and a second cylindrical shell symmetrically arranged, the first cylindrical shell and the second cylindrical shell are both semi-closed structures and their openings are opposite, the inner side of the end surface of the opening of the first cylindrical shell is recessed to form a first annular step surface, the inner side of the end surface of the opening of the second cylindrical shell is recessed to form a second annular step surface, the first outer ring, the spring washer and the second outer ring are all embedded in the gap between the first annular step surface and the second annular step surface, at least six first long through holes axially penetrated are circumferentially arranged inside the side wall of the first cylindrical shell, the inner end opening of the first long through hole is located on the first annular step surface, the second long through holes corresponding in number and position to the first long through holes are axially penetrated inside the side wall of the second cylindrical shell, and the first The inner end openings of the two long through holes are located on the second annular step surface, the first outer ring is provided with first external connecting holes whose number and position correspond to the first long through hole, the second outer ring is provided with second external connecting holes whose number and position correspond to the second long through hole, the spring washer is provided with washer positioning holes whose number and position correspond to the first long through hole, the first cylindrical shell and the second cylindrical shell are fixedly connected by screwing and locking between the connecting long screws whose number corresponds to the first long through hole and the corresponding external connecting nuts, the connecting long screw extends from one end of the first cylindrical shell and passes through the first long through hole, the first external connecting hole, the washer positioning hole, the second external connecting hole and the second long through hole in sequence, and is locked and fixed to the other end of the second cylindrical shell with the external connecting nut.

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