Electromagnetic micro-vibration energy harvester

Abstract

The electromagnetic micro-vibration energy harvester comprises a vibration pick-up base, coils, a resonance spring, a vibrator unit and permanent magnets, the resonance spring is fixedly connected between the center of the vibration pick-up base and the center of the vibrator unit, the coils are arranged on the periphery of the vibration pick-up base in an array mode, the permanent magnets are movably connected in the coils, and the permanent magnets are arranged on the periphery of the vibration pick-up base. And the upper end of the permanent magnet is fixedly connected with the vibrator unit. The coils are installed in an array arrangement mode, so that the structure of the energy harvester is greatly reduced, vibration mechanical energy is converted into electric energy in the small energy harvester, and energy supply can be provided for sensor nodes of a structure state monitoring system. The device is suitable for the working condition of small displacement, and the energy conversion efficiency in unit area is improved by adopting array type multi-coil arrangement.

Description

TECHNICAL FIELD

[0001] The utility model belongs to energy recovery device technical field, concretely relates to an electromagnetic microvibration energy harvester. BACKGROUND

[0002] Structural health monitoring system is a kind of modern monitoring technology for synchronous, online, dynamic engineering structure in long-term service, and the energy supply of sensor subsystem is a relatively difficult problem in the harsh service environment, generally adopts wired power supply and chemical battery two ways, but wired power supply has the shortcomings of long wiring and difficult installation, and chemical battery needs to consider the problem of replacing battery or charging. There is abundant vibration energy in engineering structure, and it is a new and feasible method to convert the vibration energy in engineering environment into electric energy to supply energy for its sensor subsystem.

[0003] The current energy harvester is complex in structure, large in size, and mostly for large-amplitude and large-acceleration scenes, and the energy harvester for micro-displacement is not perfect enough. UTILITY MODEL CONTENTS

[0004] The utility model provides an electromagnetic microvibration energy harvester for solving the technical problem of the background art.

[0005] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: an electromagnetic microvibration energy harvester, comprising: a vibration pickup base, a coil, a resonance spring, a vibrator unit and a permanent magnet, the resonance spring is fixedly connected between the center of the vibration pickup base and the center of the vibrator unit, the coils are arranged and installed in array around the vibration pickup base, each coil is movably connected with a permanent magnet inside, and the vibrator unit is fixedly connected to the upper end of the permanent magnet.

[0006] Preferably, the center of the vibration pickup base is fixedly connected with a spring base connector by a screw, one end of the resonance spring is sleeved outside the spring base connector, the other end of the resonance spring is sleeved outside the spring top connecting seat after extending out of the vibrator unit, and the vibrator unit is fixedly connected around the spring top connecting seat.

[0007] Preferably, the coils are sequentially provided from top to bottom outside: a first energy harvesting coil winding, a second energy harvesting coil winding and a third energy harvesting coil winding.

[0008] Preferably, the energy harvester further comprises a linear guide structure, wherein the linear guide structure comprises a linear bearing and a guide column, the linear bearing and the guide column are movably connected with each other, the guide column is fixedly connected with the vibrator unit, and the linear bearing is fixedly connected with the vibration pickup base.

[0009] Preferably, the vibrator unit is fixedly connected with the upper end of a vibrator mass block, and the vibrator mass block is fixedly connected with the lower end of the permanent magnet.

[0010] Preferably, the vibration pickup base is a cubic structure.

[0011] Preferably, the coil is a hollow cylindrical body, and the permanent magnet is circular.

[0012] The electromagnetic micro-vibration energy harvester has the advantages that:

[0013] The electromagnetic micro-vibration energy harvester has the advantages that: BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 is a perspective view of the electromagnetic micro-vibration energy harvester according to the present application;

[0015] Figure 2 is a sectional view of the electromagnetic micro-vibration energy harvester according to the present application;

[0016] Figure 3 is a perspective view of the coil of the electromagnetic micro-vibration energy harvester according to the present application;

[0017] Figure 4 is a side view of the electromagnetic micro-vibration energy harvester according to the present application;

[0018] Figure 5 is a sectional view of the electromagnetic micro-vibration energy harvester according to the present application; Figure 4

[0019] Figure 6 is a structural view of the linear bearing and guide column of the electromagnetic micro-vibration energy harvester according to the present application;

[0020] Figure 7 is the induced electromotive force of the coil of the electromagnetic micro-vibration energy harvester according to the present application.

[0021] ​In the figure: 1. Vibration pickup base, 2. Coil, 201. First energy harvesting coil winding, 202. Second energy harvesting coil winding, 203. Third energy harvesting coil winding, 301. Spring base connector, 302. Resonance spring, 303. Spring top connector, 4. Oscillator unit, 401. Permanent magnet, 5. Linear bearing, 601. Guide column, 602. Detailed Implementation

[0022] The specific embodiments of the present invention will now be described in full with reference to the accompanying drawings. For clarity, many physical details will be described in the following description. However, it should be understood that these physical details are not intended to limit the present invention. That is, in some embodiments of the present invention, these physical details are not essential. Furthermore, for the sake of simplicity, some conventional structures and components will be shown in the drawings in a simple schematic manner.

[0023] like Figures 1-7 As shown, this utility model also provides an electromagnetic micro-vibration energy harvester, including: a vibration pickup base 1, a coil 2, a resonant spring 302, an oscillator unit 4, and a permanent magnet 5. The resonant spring 302 is fixedly connected between the center of the vibration pickup base 1 and the center of the oscillator unit 4. The coil 2 is arranged in an array around the periphery of the vibration pickup base 1. A permanent magnet 5 is movably connected inside each coil 2. The oscillator unit 4 is fixedly connected to the upper end of the permanent magnet 5.

[0024] Furthermore, the center of the vibration pickup base 1 is fixedly connected to the spring base connector 301 by screws. One end of the resonant spring 302 is sleeved on the outside of the spring base connector 301. The other end of the resonant spring 302 extends out of the oscillator unit 4 and is sleeved on the outside of the spring top connector 303. The oscillator unit 4 is fixedly connected around the periphery of the spring top connector 303.

[0025] Furthermore, the coil 2 is externally arranged from top to bottom as follows: a first energy-harvesting coil winding 201, a second energy-harvesting coil winding 202, and a third energy-harvesting coil winding 203. To address the low power generation efficiency of micro-displacement and vibration energy harvesters, the resonance characteristics of a single-degree-of-freedom spring-mass damping system are utilized to amplify the minute external excitation. The coil 2 adopts a three-section coil frame structure design with an internal magnet, fully utilizing the magnetic fields of the upper, middle, and lower parts of the permanent magnet 5 to improve the energy conversion efficiency of a single coil 2. An array-style coil 2 arrangement is used to maximize the energy conversion efficiency per unit area. The specific structure of the coil frame is as follows... Figure 3As shown, the coil framework is made of epoxy resin, which is processed by lathe to ensure the coaxiality and surface finish of the framework. The enameled wire is selected to be wound in the clockwise direction, counterclockwise direction and clockwise direction in the framework area to form the first energy trapping coil winding 201, the second energy trapping coil winding 202 and the third energy trapping coil winding 203. Eight coils 2 are arranged in an array on the vibration pickup base 1. When the permanent magnet 5 moves in the vertical direction, the induced electromotive force generated by each part of the first energy trapping coil winding 201, the second energy trapping coil winding 202 and the third energy trapping coil winding 203 is as follows Figure 7 As shown, the magnetic flux in the coil changes when the permanent magnet moves reciprocatingly. According to the principle of "come and go" of Lenz's law, the induced electromotive force with different directions and sizes is generated in each part of the coil.

[0026] Further, the energy trap further includes a linear guide structure, wherein the linear guide structure includes a linear bearing 601 and a guide column 602, the linear bearing 601 and the guide column 602 are connected to each other in sliding connection, the guide column 602 is fixedly connected to the vibrator unit 4, and the linear bearing 601 is fixedly connected to the vibration pickup base 1.

[0027] Further, the vibrator unit 4 is fixedly connected to the upper end of a vibrator mass block 401, and the vibrator mass block 401 is fixedly connected to the lower end of the permanent magnet 5.

[0028] Further, the vibration pickup base 1 is a cubic structure.

[0029] Further, the coil 2 is a hollow cylinder, and the permanent magnet 5 is a circle.

[0030] Embodiment:

[0031] The electromagnetic micro-vibration energy trap is composed of a vibration pickup base 1, a coil 2, a resonance spring 302, a vibrator unit 4, a permanent magnet 5 and the like. When encountering external vibration excitation, the vibration pickup base 1 captures and transmits these vibrations to the resonance spring 302. When the natural frequency of the resonance spring 302 is consistent with the external excitation frequency, resonance phenomenon occurs, effectively enhancing the amplitude of the initial vibration. When a simple harmonic excitation occurs in the external environment, the energy trap is forced to vibrate.

[0032] After resonance, the vibrator unit 4 drives the permanent magnet 5 to move reciprocatingly in the vertical direction, and then the magnetic flux in the coil 2 changes, generating an induced electromotive force. The induced electromotive force can be converted into direct current that can supply power to electronic elements through the rectification and voltage stabilization circuit of the prior art, realizing self-power supply of the sensor subsystem of the structural health monitoring system.

[0033] The working process of the electromagnetic coupling micro-vibration energy harvester is as follows: the energy harvester is installed on the vibration source of the external environment; when the external environment has vibration, the vibration pickup base 1 collects the vibration in the environment and transmits it to the vibrator unit 4; the natural frequency of the vibrator unit 4 is consistent with the vibration frequency of the external excitation, so that resonance phenomenon occurs to amplify the initial excitation to a certain extent; the linear guide structure ensures that the resonant spring 302 drives the vibrator unit 4 to make vertical reciprocating motion, so that the relative position of the permanent magnet 5 and the energy harvesting coil 2 changes, the magnetic flux of the first energy harvesting coil winding 201, the second energy harvesting coil winding 202 and the third energy harvesting coil winding 203 changes to generate induced electromotive force, 8 coils each contain 3 windings, a total of 24 AC power of the same frequency, different peak values and different phases are generated, which are connected to the multi-source rectifier circuit to complete the conversion of AC to DC, and to supply energy for the sensor node.

[0034] The above merely describes the specific implementation of the present application and is not used to limit the present application. The present application can be changed and varied in various ways for those skilled in the art. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application shall be included in the scope of the claims of the present application.

Claims

1. An electromagnetic micro-vibration energy harvester, characterized by, Include: Pick up the base (1), coil (2), resonance spring (302), vibrator unit (4), permanent magnet (5), the center of the pick-up base (1) and the center of the vibrator unit (4) are fixedly connected with resonance spring (302), the periphery of the pick-up base (1) is arranged in an array to install coil (2), each coil (2) is movably connected with permanent magnet (5) inside, the upper end of the permanent magnet (5) is fixedly connected with the vibrator unit (4).

2. The energy harvester of claim 1, wherein, The center of the pick-up base (1) is fixedly connected with spring base connector (301) through screw, one end of resonance spring (302) is sleeved outside spring base connector (301), the other end of resonance spring (302) is sleeved outside spring top connecting seat (303) after extending behind vibrator unit (4), the periphery of spring top connecting seat (303) is fixedly connected with vibrator unit (4).

3. The energy harvester of claim 1, wherein, The coil (2) is provided with first energy trapping coil winding (201), second energy trapping coil winding (202) and third energy trapping coil winding (203) from top to bottom outside in turn.

4. The energy harvester of claim 1, wherein, Also include: Linear guide structure; The linear guide structure includes linear bearing (601) and guide column (602), the linear bearing (601) and the guide column (602) are slidably connected with each other; the guide column (602) is fixedly connected with the vibrator unit (4), and the linear bearing (601) is fixedly connected with the pick-up base (1).

5. The energy harvester of claim 2, wherein, The vibrator unit (4) is fixedly connected with vibrator mass block (401) at the upper end, and the vibrator mass block (401) is fixedly connected with permanent magnet (5) at the lower end.

6. The energy harvester of claim 4, wherein, The pick-up base (1) is a cubic structure.

7. The energy harvester of claim 5, wherein, The coil (2) is a hollow cylindrical body, and the permanent magnet (5) is circular.

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