Multi-degree-of-freedom pendulum type vibration energy collector

Abstract

The utility model discloses a multi-degree-of-freedom pendulum type energy collector. The multi-degree-of-freedom pendulum type energy collector comprises an energy conversion assembly; two first magnetic attraction pieces are symmetrically arranged at one end of the swing type assembly, a magnetic circuit gap is formed by the two first magnetic attraction pieces, and the transduction assembly is located in the magnetic circuit gap and does not make contact with the first magnetic attraction pieces; the fixed magnetic piece is fixed on the swing type assembly, and the magnetic field direction of the fixed magnetic piece is matched with the swing direction; the movable magnetic part corresponds to the fixed magnetic part and is arranged in the swinging direction of the swinging assembly, the movable magnetic part and the fixed magnetic part are spaced, and the magnetic poles of the sides close to the movable magnetic part and the fixed magnetic part are the same. When the environment vibration frequency is matched with the resonant frequency of the pendulum assembly, the pendulum assembly generates resonance, and electric energy output is generated through the transduction assembly. Similarly, when the movable magnetic piece generates resonance, due to the fact that nonlinear magnetic force can be generated between the movable magnetic piece and the fixed magnetic piece, the magnetic force transmits vibration to the swing type assembly, the swing type assembly also generates large-amplitude vibration, meanwhile, the energy conversion assembly also generates high electric energy output, and the collection bandwidth is expanded.

Description

Technical Field

[0001] The present application relates to the field of energy harvesting, and in particular to a multi-degree-of-freedom pendulum energy harvester. Background Art

[0002] The energy generated by vibration collection has a wide range of applications, such as mechanical processing production, automated control systems, environmental monitoring systems, etc.

[0003] To collect the energy generated by vibration, the collection component of the collector must be consistent with the vibration frequency in the environment, so that resonance occurs. However, the vibration in the environment often contains multiple and widely distributed frequencies within a wide frequency band. As a high-strength and long-life collector, the pendulum energy harvester is a key research direction in the field of energy harvesters. However, the collectors in related technologies often have simple component movement modes and use a single-degree-of-freedom pendulum structure to achieve broadband vibration energy collection, resulting in a narrow collection frequency band. Utility Model Content

[0004] In view of this, the present application proposes a multi-degree-of-freedom pendulum energy harvester, which can solve the problem of narrow collection frequency band of the harvester in the related art.

[0005] In order to solve the above problems, the present application discloses a multi-degree-of-freedom pendulum energy harvester, comprising:

[0006] Transducer assembly;

[0007] A pendulum-type component, one end of which is symmetrically provided with two first magnetic members, the two first magnetic members forming a magnetic circuit gap, the energy conversion component being in the magnetic circuit gap and not in contact with the first magnetic members;

[0008] A fixed magnetic part, fixed on the pendulum assembly, and its magnetic field direction matches the swing direction;

[0009] The movable magnetic part corresponds to the fixed magnetic part and is arranged in the swing direction of the pendulum assembly. The movable magnetic part and the fixed magnetic part are kept at a distance and have the same magnetic pole on one side.

[0010] Preferably, there are two or one fixed magnetic parts.

[0011] Preferably, the multi-degree-of-freedom pendulum energy harvester further includes a bottom plate, a top plate, and side plates;

[0012] The side panels are connected to the bottom panel and the top panel, and the top panel and the bottom panel are arranged in the same direction starting from the connection with the side panels, and the swing assembly is pivotally connected to the side panels;

[0013] When there are two fixed magnetic parts, the two movable magnetic parts are symmetrically arranged on the upper and lower sides of the pendulum assembly and connected to the bottom plate and the top plate; when there is one fixed magnetic part, the movable magnetic part is connected to the bottom plate or the top plate.

[0014] Preferably, the movable magnetic part includes an elastic part, a support part and a second magnetic part, the elastic part and the second magnetic part are sequentially mounted on the support part, and the second magnetic part can slide along the support part, and the support part is connected to the bottom plate and / or the top plate.

[0015] Preferably, a transducer support is arranged on the bottom plate to support the transducer assembly.

[0016] Preferably, any one of the first magnetic attraction members includes a magnetic circuit permanent magnet and an armature.

[0017] Preferably, the magnetic circuit permanent magnet includes a pair of sub-permanent magnets, and the polarities of the pair of sub-permanent magnets are opposite.

[0018] Preferably, a pair of sub-permanent magnets in the magnetic circuit permanent magnet are arranged with an interval therebetween.

[0019] Preferably, the energy conversion component comprises at least one magnetostrictive layer and at least one piezoelectric layer; the magnetostrictive layer and the piezoelectric layer are alternately stacked.

[0020] Preferably, the magnetostrictive layer is magnetized along its length direction, and the piezoelectric layer is polarized along its thickness direction or length direction.

[0021] The above is the specific technical solution of the present application. The primary improvement of the present application is that a movable magnetic part is added on the basis of a single-degree-of-freedom broadband pendulum collector, so that the pendulum collector becomes a multi-degree-of-freedom vibration system. When the ambient vibration frequency matches the resonant frequency of the pendulum component, the pendulum component will resonate and generate electrical energy output through the transducer component. When the ambient vibration frequency matches the resonant frequency of the movable magnetic part, the movable magnetic part will resonate, and a nonlinear magnetic force will be generated between the movable magnetic part and the fixed magnetic part. This magnetic force will transmit the vibration to the pendulum component, causing the pendulum component to also vibrate with a larger amplitude. At the same time, the transducer component also generates a higher electrical energy output, which increases the bandwidth, so that the multi-degree-of-freedom pendulum energy harvester has the ability of broadband vibration. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of a multi-degree-of-freedom pendulum vibration energy harvester of the present application;

[0023] Figure 2 It is a structural schematic diagram of a pendulum-type assembly of the present application;

[0024] Figure 3 It is a schematic diagram of a transducer component of the present application.

[0025] Description of reference numerals:

[0026] 100-swinging assembly, 101-first magnetic attraction member, 1011-magnetic circuit permanent magnet, 10111-sub-permanent magnet, 1012-armature, 102-fork plate;

[0027] 200-transducer assembly, 201-piezoelectric layer, 202-magnetostrictive layer;

[0028] 300- movable magnetic part, 301- elastic part, 302- supporting part, 303- second magnetic attraction part;

[0029] 4-fixed magnetic part, 5-transducer support, 6-rotation axis, 7-connecting part, 8-bottom plate, 9-side plate, 10-top plate. DETAILED DESCRIPTION

[0030] In order to enable those skilled in the art to better understand the technical solution of the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present invention.

[0031] As a high-strength and long-life energy harvester, the pendulum energy harvester is a key research direction in the field of energy harvesters. However, the collectors in the related art often have a relatively simple component movement mode and use a single-degree-of-freedom pendulum structure to achieve broadband vibration energy harvesting, resulting in a narrow harvesting frequency band. In order to solve this problem, the present application discloses a multi-degree-of-freedom pendulum vibration energy harvester, such as Figure 1 and Figure 2 As shown:

[0032] A multi-degree-of-freedom pendulum vibration energy harvester, comprising: a transducer assembly 200; a pendulum assembly 100, wherein the pendulum assembly 100 has two first magnetic members 101 symmetrically arranged at one end, the two symmetrically arranged first magnetic members 101 forming a magnetic circuit gap, the transducer assembly 200 is in the magnetic circuit gap and does not contact the first magnetic members 101; a fixed magnetic member 4, fixed on the pendulum assembly 100, and its magnetic field direction matches the swing direction;

[0033] The movable magnetic component 300 , corresponding to the fixed magnetic component 4 , is disposed in the swing direction of the pendulum assembly 100 . The movable magnetic component 300 and the fixed magnetic component 4 are spaced apart and have the same magnetic pole on the side close to each other.

[0034] There are two or one fixed magnetic parts 4.

[0035] The present application adds a movable magnetic part 300 on the basis of a single-degree-of-freedom broadband pendulum collector, making the pendulum collector a multi-degree-of-freedom vibration system. When the ambient vibration frequency matches the resonant frequency of the pendulum assembly 100, the pendulum assembly 100 will resonate and generate electrical energy output through the transducer assembly 200. Similarly, when the ambient vibration frequency matches the resonant frequency of the movable magnetic part 300, the movable magnetic part 300 will resonate, and because the magnetic properties of the movable magnetic part 300 and the side corresponding to the fixed magnetic part 4 are opposite and maintain an appropriate interval, a nonlinear magnetic force will be generated between the two, and this magnetic force will transmit the vibration to the pendulum assembly 100, and the pendulum assembly 100 can also generate a relatively large amplitude of vibration. At the same time, the transducer assembly also generates a relatively high electrical energy output, so that the multi-degree-of-freedom pendulum energy harvester has the ability of broadband vibration.

[0036] Furthermore, when designing, the resonant frequency of the pendulum assembly 100 and the resonant frequency of the movable magnetic part 300 are designed to be close to each other to collect vibrations of continuous frequency, which will further improve the bandwidth of the multi-degree-of-freedom pendulum energy harvester. If the resonant frequency is designed to be more dispersed, the multi-degree-of-freedom pendulum energy harvester is not very applicable because the collected frequency is more dispersed.

[0037] like Figure 1 As shown, in this embodiment, the multi-degree-of-freedom pendulum energy harvester also includes a bottom plate 8, a side plate 9 and a top plate 10; the side plate 9 is connected to the bottom plate 8 and the top plate 10, and the pendulum assembly 100 is connected to the side plate 9; and the top plate 10 and the bottom plate 8 are arranged in the same direction starting from the connection with the side plate 9, and the pendulum assembly 100 is pivotally connected to the side plate 9; when there are two fixed magnetic parts 4, the two movable magnetic parts 300 are symmetrically arranged on the upper and lower sides of the pendulum assembly 100, and are connected to the bottom plate 8 and the top plate 10; when there is one fixed magnetic part 4, the movable magnetic part 300 is connected to the bottom plate 8 or the top plate 10.

[0038] In this embodiment, the pivot connection is rotatably connected by a connecting member 7 and a rotating shaft 6, and the connection between the side panel 9 and the bottom panel 8 is located at the edge of the bottom panel 8, thereby expanding the space volume formed by the side panel 9, the bottom panel 8 and the top panel 10 to accommodate the pendulum assembly 100, the movable magnetic component 300 and the transducer assembly 200.

[0039] like Figure 1 As shown, in this embodiment, the movable magnetic part 300 includes an elastic part 301, a support part 302 and a second magnetic part 303. The elastic part 301 and the second magnetic part 303 are sequentially mounted on the support part 302, and the second magnetic part 303 slides along the support part 302. The support part 302 is connected to the bottom plate 8 and / or the top plate 10.

[0040] A first through hole is defined in the elastic member 301 , a second through hole is defined in the second magnetic member 303 , and the support member 302 is located in the first through hole and the second through hole.

[0041] The second magnetic member 303 uses a magnet with a through hole. The elastic member 301 uses a compression spring, and the support member 302 uses a cylindrical rod. It can be understood that the inner hole formed by winding the compression spring corresponds to the first through hole of the elastic member 301, and the through hole of the second magnetic member 303 corresponds to the second through hole. It should be noted that the diameters of the first through hole and the second through hole are slightly larger than the diameter of the cylindrical rod, so that the second magnetic member 303 only moves along the length direction of the support member 302. Among them, the connection method between the second magnetic member 303 and the compression spring can be plug-in, welding or bonding. At the same time, the elastic member 301 can also be selected from spring washers, dampers, etc., but the stability of the connection with the second magnetic member 303 needs to be guaranteed.

[0042] like Figure 1 As shown, in some embodiments, the transducer support 5 is disposed on the bottom plate 8 to support the transducer assembly 200. The transducer support 5 includes a first end and a second end, wherein the first end is connected to the transducer assembly 200, and the second end is connected to the bottom plate 8.

[0043] Furthermore, if Figure 2 As shown, any first magnetic attraction member 101 includes a magnetic circuit permanent magnet 1011 and an armature 1012 .

[0044] The two first magnetic members 101 are connected to the fork-shaped plate 102. The fork-shaped plate 102 can support and isolate the two first magnetic members 101. By selecting an isolation distance with a suitable thickness, a high-gradient magnetic field can be generated in the air gap.

[0045] The armature 1012 can be used to fix the magnetic circuit permanent magnet 1011 on the pendulum assembly 100 and keep it relatively still. At the same time, the armature 1012 can also limit the closed magnetic circuit and increase the magnetic field strength induced by the energy conversion assembly 200, playing a magnetic conduction role. The two first magnetic suction members 101 arranged opposite to each other form a magnetic circuit gap, and the energy conversion assembly 200 is located between the magnetic circuit gaps to achieve the conversion of mechanical energy into electrical energy.

[0046] Furthermore, the magnetic circuit permanent magnet 1011 includes a pair of sub-permanent magnets 10111, the polarities of the pair of sub-permanent magnets 10111 are opposite, and the pair of sub-permanent magnets 10111 in the magnetic circuit permanent magnet 1011 are arranged at intervals.

[0047] A pair of sub-permanent magnets 10111 facilitates the realization of a closed magnetic circuit. Maintaining a spacing between the sub-permanent magnets 10111 can make the closed magnetic circuit annular and have a high magnetic field gradient, thereby enabling the transducer assembly 200 to produce a higher power output.

[0048] like Figure 3As shown, in this embodiment, the transducer assembly 200 includes at least one magnetostrictive layer 202 and at least one piezoelectric layer 201; the magnetostrictive layer 202 and the piezoelectric layer 201 are alternately stacked and located in the magnetic circuit gap. Preferably, the magnetization direction of the magnetostrictive layer 202 is the same as its length direction, and the polarization direction of the piezoelectric layer 201 is the same as its thickness direction or length direction.

[0049] In this embodiment, the transducer assembly 200 is a rectangular sheet structure, including three layers: two piezoelectric layers 201 and one magnetostrictive layer 202; the two piezoelectric layers 201 are bonded to the two sides of the magnetostrictive layer 202 respectively; and the magnetization direction of the magnetostrictive layer 202 is the same as its length direction, and the polarization direction of the piezoelectric layer 201 is the same as its thickness direction or length direction. In the present invention, the magnetization direction of the magnetostrictive layer 202 and the polarization direction of the piezoelectric layer 201 can enable the transducer assembly 200 to better convert mechanical energy into electrical energy. Among them, the magnetostrictive layer 202 is usually some ferromagnetic materials, such as nickel, terbium dysprosium iron alloy, magnesium zinc ferrite, etc. These materials can produce magnetostrictive effect under the action of an external magnetic field, that is, they can change their size under the action of a magnetic field. The piezoelectric layer 201 is usually some crystalline materials with piezoelectric effect, including quartz, lead zirconate titanate, and lead magnesium niobate. When subjected to external force or pressure, these materials can undergo charge separation and generate a potential difference, thereby exhibiting a piezoelectric effect, and can be combined according to different application needs.

[0050] In other embodiments, the transducer assembly 200 has three layers, including one piezoelectric layer 201 and two magnetostrictive layers 202, or the transducer assembly 200 has other number of layers, but it should be noted that in these embodiments, it is necessary to ensure that the magnetostrictive layer 202 and the piezoelectric layer 201 are overlapped. The reason for this treatment is that overlapping the two materials can achieve more efficient energy conversion between the magnetic field and the pressure, and improve the sensitivity of the response to a certain extent.

[0051] Among them, the rotating shaft 6, the bottom plate 8, the top plate 10, the side plate 9, the connecting piece 7, the transducer support 5, and the fork-shaped plate 102 in the pendulum assembly 100 are made of non-magnetic materials, such as aluminum, copper, plastic and other non-magnetic materials, so as to limit the magnetic field path and enhance the induction intensity of the transducer assembly 200 to the magnetic field.

[0052] The above is a detailed introduction to a multi-degree-of-freedom pendulum energy harvester provided in an embodiment of the present application. The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the various embodiments can be referenced to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part description. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. A multi-degree-of-freedom pendulum vibration energy harvester, characterized in that: include: Transducer assembly; A pendulum-type component, one end of which is symmetrically provided with two first magnetic members, the two first magnetic members forming a magnetic circuit gap, the energy conversion component being in the magnetic circuit gap and not in contact with the first magnetic members; A fixed magnetic part, fixed on the pendulum assembly, and its magnetic field direction matches the swing direction; The movable magnetic part corresponds to the fixed magnetic part and is arranged in the swing direction of the pendulum assembly. The movable magnetic part and the fixed magnetic part are kept at a distance and have the same magnetic pole on one side.

2. The multi-degree-of-freedom pendulum vibration energy harvester according to claim 1, characterized in that: The number of the fixed magnetic parts is two or one.

3. The multi-degree-of-freedom pendulum vibration energy harvester according to claim 2, characterized in that: Also includes: Bottom plate, top plate, side plates; The side panels are connected to the bottom panel and the top panel, and the top panel and the bottom panel are arranged in the same direction starting from the connection with the side panels, and the swing assembly is pivotally connected to the side panels; When there are two fixed magnetic parts, the two movable magnetic parts are symmetrically arranged on the upper and lower sides of the pendulum assembly and connected to the bottom plate and the top plate; when there is one fixed magnetic part, the movable magnetic part is connected to the bottom plate or the top plate.

4. The multi-degree-of-freedom pendulum vibration energy harvester according to claim 3, characterized in that: The movable magnetic part includes an elastic part, a supporting part and a second magnetic part. The elastic part and the second magnetic part are sequentially mounted on the supporting part, and the second magnetic part can slide along the supporting part. The supporting part is connected to the bottom plate and / or the top plate.

5. The multi-degree-of-freedom pendulum vibration energy harvester according to claim 3, characterized in that: The transducer support is arranged on the bottom plate and is used for supporting the transducer assembly.

6. The multi-degree-of-freedom pendulum vibration energy harvester according to claim 1, characterized in that: Any of the first magnetic attraction components includes a magnetic circuit permanent magnet and an armature.

7. The multi-degree-of-freedom pendulum vibration energy harvester according to claim 6, characterized in that: The magnetic circuit permanent magnet includes a pair of sub-permanent magnets, and the polarities of the pair of sub-permanent magnets are opposite.

8. The multi-degree-of-freedom pendulum vibration energy harvester according to claim 7, characterized in that: A pair of sub-permanent magnets in the magnetic circuit permanent magnet are arranged at intervals.

9. The multi-degree-of-freedom pendulum vibration energy harvester according to claim 1, characterized in that: The energy conversion component comprises at least one magnetostrictive layer and at least one piezoelectric layer, and the magnetostrictive layer and the piezoelectric layer are alternately stacked.

10. The multi-degree-of-freedom pendulum vibration energy harvester according to claim 9, characterized in that: The magnetization direction of the magnetostrictive layer is the same as its length direction, and the polarization direction of the piezoelectric layer is the same as its thickness direction or length direction.

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