JP6182258B2 - Vibration generator - Google Patents

Description

  The present invention relates to a vibration power generator using a leaf spring, and more particularly to an electromagnetic induction vibration power generator having a configuration capable of widening the frequency range in which a desired power generation efficiency can be obtained as compared with the related art. Is.

  When the magnet is vibrated so as to pass through the conductive coil, an induced current is generated in the coil and an electromotive force is generated. As an example of utilizing this principle, there is an electromagnetic induction type vibration generator using a leaf spring. Such a vibration generator can generate electric energy based on vibration energy of the external environment.

  Furthermore, by using a vibration generator, it is possible to generate electric energy while eliminating the need for power supply by a power cable or a battery. From this point of view, vibration generators are expected to be used in many applications where economic advantages or operational advantages are expected. And as a prior art of the vibration generator using a leaf | plate spring, there exists what aimed at the improvement of energy efficiency (for example, refer patent document 1).

Japanese Translation of PCT International Publication No. 2010-525779

However, the prior art has the following problems.
In a conventional electromagnetic induction type vibration generator using a leaf spring, there is no adjustment mechanism for the resonance frequency, or even if there is an adjustment mechanism, the spring is mechanically adjusted by applying stress to the spring. . For this reason, the resonance frequency cannot be freely adjusted, and it is difficult to adjust (adjust) the resonance frequency to a desired resonance frequency according to the application.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a vibration generator capable of achieving a wider frequency range than that in the past in which a desired power generation efficiency can be obtained. And

  The vibration generator according to the present invention includes a permanent magnet configured in a columnar shape or a cylindrical shape, a coil that is fixedly disposed on the outer periphery of the permanent magnet with a gap, and guide rods at both ends in the axial direction of the permanent magnet. Two magnetic spring portions each configured as a pair of magnets, an adjustment mechanism portion capable of adjusting the distance between the magnets of the pair of magnets in each of the two magnetic spring portions, and a shaft of the permanent magnet Two leaf springs that are respectively connected to guide rods provided at both ends in the direction, and that suppress the rolling of the movable portion composed of the permanent magnet and the guide rod within a plane perpendicular to the axial direction, A vibration generator that generates electric power by relative movement between a permanent magnet and a coil due to the vibration of the magnet in the axial direction, and has a plurality of movable parts composed of permanent magnets and guide rods. Extendable A connecting spring part that is connected along the axial direction by a spring material, and each of the plurality of movable parts is selected by selecting the connecting spring part and adjusting the distance between the magnetic poles of the two magnetic spring parts by the adjusting mechanism part. The resonance frequency is individually set.

  According to the present invention, in the vibration power generator using a leaf spring, the movable portion is configured as a plurality of movable portions connected by magnetic springs or winding springs, and at both ends of the connected movable portions in the vibration direction. A frequency range in which a desired power generation efficiency can be obtained by providing a mechanism that includes a magnetic spring part that can adjust the gap length and can individually change the resonance frequency of a plurality of movable parts in a non-contact manner. In addition, it is possible to obtain a vibration generator capable of widening the bandwidth.

It is a schematic sectional drawing for demonstrating the structure of the vibration generator in Embodiment 1 of this invention. It is a schematic diagram at the time of connecting two movable parts fixedly. It is a figure which shows the frequency characteristic of the output voltage by the vibration generator of the structure of FIG. In the vibration power generator in Embodiment 1 of this invention, it is a schematic diagram at the time of connecting two movable parts with a spring. In Embodiment 1 of this invention, it is a figure which shows the frequency characteristic of an output voltage at the time of connecting two movable parts via the connection spring part 5c. In Embodiment 1 of this invention, it is a figure which shows the frequency characteristic of an output voltage at the time of connecting two movable parts via the connection spring part 5c. It is a figure for demonstrating the frequency adjustment method of the vibration generator in Embodiment 1 of this invention. It is a figure which shows the structure of the leaf | plate spring in Embodiment 1 of this invention. It is a figure which shows the frequency characteristic of an output voltage at the time of changing a frequency by adjustment of the distance between magnets of the magnetic spring part in Embodiment 1 of this invention.

  According to the present invention, in a vibration power generator using a leaf spring, the movable part is configured as a plurality of movable parts connected by a magnetic spring or a winding spring (first feature), and the vibration direction of the connected movable parts is A technical feature is that a magnetic spring portion capable of adjusting the gap length is provided at both ends (second feature). By providing such a configuration, the frequency range in which a desired power generation efficiency can be obtained can be made wider than before by changing the resonance frequencies of the plurality of movable parts individually without contact. An excellent effect can be obtained.

  A preferred embodiment of the vibration generator according to the present invention having such technical features will be described in detail below with reference to the drawings.

Embodiment 1 FIG.
First, the second feature “providing magnetic spring portions with adjustable gap lengths at both ends in the vibration direction of the movable portion” will be described as an example of a single movable portion.

  FIG. 7 is a schematic cross-sectional view for explaining the basic structure of the vibration power generator. The vibration generator shown in FIG. 7 includes permanent magnets 1a and 1b, a coil 2, leaf springs 3a and 3b, guide rods 4a and 4b, magnetic spring portions 5a and 5b, a frame 10, a top plate 11, and an upper plate for attaching a magnet. 12, a middle plate 13, a lower plate 14 for attaching a magnet, a bottom plate 15, and a frequency adjusting mechanism 16.

  In FIG. 7, columnar or cylindrical permanent magnets (hereinafter referred to as magnets) 1a and 1b are disposed so as to face the same pole. Further, the coil 2 surrounds the magnets 1a and 1b. Here, the coil 2 is fixed to the intermediate plate 13, and electric energy is generated when the magnets 1 a and 1 b arranged in the coil 2 vibrate.

  Further, the magnet 1a is connected to the magnetic spring portion 5a via the guide bar 4a, and an intermediate portion of the guide bar 4a is held by the plate spring 3a. Similarly, the magnet 1b is connected to the magnetic spring part 5b via the guide bar 4b, and the intermediate part of the guide bar 4b is held by the leaf spring 3b.

  Here, the structure of the leaf springs 3a and 3b will be described with reference to the drawings. FIG. 8 is a diagram showing the configuration of the leaf springs 3a and 3b. The plate springs 3a and 3b shown in FIG. 8 are formed with a plurality of spiral slits S, a central hole H1, and a plurality of outer peripheral holes H2 with respect to a circular spring member.

  The hole H1 at the center corresponds to the connection with the guide rods 4a and 4b shown in FIG. 7, and the plurality of holes H2 at the outer periphery correspond to the connection with the frame 10 shown in FIG. The plurality of spiral slits S have a function of suppressing the rolling of the guide rods 4a and 4b, which are movable parts. That is, in FIG. 7, the magnets 1 a and 1 b vibrate in the vertical direction on the paper surface of FIG. 7 due to the vibration energy of the external environment, but the roll perpendicular to the vertical direction is suppressed by the action of the slit S. The Rukoto.

  Next, returning to FIG. 7, the magnetic spring portions 5a and 5b and the frequency adjusting mechanism portion 16 which are one of the technical features of the present application will be described. The magnetic spring parts 5a and 5b are provided at both ends in the vibration direction of the magnets 1a and 1b (vertical direction on the paper surface of FIG. 7). More specifically, each of the magnetic spring portions 5a and 5b is composed of a pair of magnets having the same poles arranged to face each other.

  One of the pair of magnets constituting the magnetic spring portion 5a is connected to the end of the guide bar 4a, and the other is fixed to the magnet mounting upper plate 12. Similarly, one of the pair of magnets constituting the magnetic spring portion 5b is connected to the end of the guide bar 4b, and the other is fixed to the lower plate 14 for attaching the magnet.

  The frequency adjustment mechanism 16 has a rotatable shaft, is connected to the magnet mounting upper plate 12 and the magnet mounting lower plate 14, and is fixed between the top plate 11 and the bottom plate 15. Then, the rotatable shaft provided in the frequency adjusting mechanism section 16 is screwed so that the magnet mounting upper plate 12 and the magnet mounting lower plate 14 are reversed with respect to the rotation. The direction of cutting is reversed.

  As a result, by rotating the rotatable shaft in one direction, the gap length of the magnetic spring portions 5a and 5b can be adjusted to be narrowed. Conversely, by rotating the rotatable shaft in the opposite direction, Both the gap lengths of the spring portions 5a and 5b can be adjusted in a widening direction. That is, the gap length (inter-magnet distance) of the magnetic spring portions 5a and 5b can be adjusted simultaneously in the same direction (direction of narrowing or widening) by the frequency adjusting mechanism section 16.

  Next, the effect of adjusting the distance between magnets will be described. When the distance between the magnets of the magnetic spring portions 5a and 5b is adjusted by the frequency adjusting mechanism 16, the spring constant increases and the frequency increases. On the other hand, when the distance between the magnets is increased, the spring constant is decreased and the frequency is decreased. Therefore, the resonance frequency of the vibration generator can be adjusted by adjusting the distance between the magnetic poles of the magnetic spring portions 5a and 5b.

  FIG. 9 is a diagram showing the frequency characteristics of the output voltage when the frequency is changed by adjusting the distance between the magnets of the magnetic spring portions 5a and 5b of the vibration generator having the basic structure of FIG. As shown in FIG. 9, the output voltage of the vibration generator having the basic structure has a mountain-shaped frequency characteristic that maximizes the resonance frequency. That is, in the vibration power generator, power generation efficiency can be increased by resonating at a resonance frequency determined by the spring constant and the mass of the movable part.

  Therefore, by adjusting the distance between the magnets of the magnetic spring portions 5a and 5b and easily changing the resonance frequency of the vibration generator so as to match the natural vibration of the vibration source in the environment where the vibration generator is used, A vibration generator capable of outputting a larger voltage value according to the environment can be obtained.

  Furthermore, the frequency adjustment mechanism 16 in FIG. 7 can perform frequency adjustment in a non-contact manner by adjusting the distance between the magnets of the magnetic spring portions 5a and 5b. As a result, there is no risk of mechanical loss due to adjustment of the resonance frequency, and a vibration generator with high durability and long life can be realized.

  Furthermore, the adjustment of the distance between the magnets by the frequency adjusting mechanism unit 16 can simultaneously change the spring constants at both ends in the axial direction in the same state. As a result, since the spring constants of the magnetic spring portions 5a and 5b are unbalanced, it is possible to avoid biasing the magnets and leaf springs of the movable portion.

  Furthermore, the repulsive force of the magnetic spring portions 5a and 5b increases as the distance between the magnets decreases. As a result, by adopting a configuration in which the magnetic spring portions 5a and 5b are provided at both ends of the movable portion, even when a large acceleration is applied, it is possible to prevent the movable portion from shaking too much and damaging the spring, and The effect of steadying when large acceleration is applied can be realized.

  However, in the basic structure shown in FIG. 7, the movable part that vibrates is constituted by one magnet 1a, 1b. Therefore, by adjusting the resonance frequency, it is possible to increase the power generation efficiency, but if the natural vibration of the vibration source in the environment where the vibration generator is used changes, the frequency will deviate from the resonance frequency, As shown in FIG. 9, there is a problem that the output voltage is extremely lowered.

  As described above, the present invention solves this problem by including the first feature that “the movable part is configured as a plurality of movable parts connected by magnetic springs or winding springs”. I am trying. Therefore, a specific configuration and effect relating to the “plural movable parts” will be described in detail below.

  FIG. 1 is a schematic cross-sectional view for explaining the structure of the vibration power generator according to Embodiment 1 of the present invention. The vibration generator in the first embodiment shown in FIG. 1 includes permanent magnets 1a (1), 1b (1), 1a (2), 1b (2), coils 2 (1), 2 (2), plates Spring 3a, 3b, 3c (1), 3c (2), guide rod 4a (1), 4b (1), 4a (2), 4b (2), magnetic spring part 5a, 5b, connecting spring part 5c, frame 10, a top plate 11, a magnet mounting top plate 12, middle plates 13 (1) and 13 (2), a magnet mounting bottom plate 14, a bottom plate 15, and a frequency adjustment mechanism 16.

  In FIG. 7, the movable part is configured as one stage. However, in FIG. 1, the movable part is configured as two stages, and the subscript “(1)” is added to the first stage configuration. In addition, the subscript “(2)” is attached to the configuration of the second stage for distinction. That is, the configuration of FIG. 1 is different from the configuration of FIG. 7 in that the movable portion including the permanent magnets 1a and 1b and the guide rods 4a and 4b and the coil have a two-stage configuration. .

  The basic operation is the same as the operation according to the configuration of FIG. 7 described above. However, since the movable part has two stages, a connecting spring part 5c for connecting the two stages of movable parts is provided. The operation will be described below with a focus on the operation of the connecting spring portion 5c.

  In FIG. 1, the movable parts are arranged in two stages, so that each movable part is connected by a connecting spring part 5 c. Here, the connecting spring portion 5c can be constituted by a pair of magnets as in the case of the magnetic spring portions 5a and 5b, but a general winding spring can also be used. In this way, in the first embodiment, the plurality of movable parts are not fixedly connected, but are connected via an extendable spring (magnetic spring or winding spring).

  Therefore, an excellent effect obtained when a plurality of movable parts are connected via a spring will be described in detail with reference to the drawings, in comparison with a case where the plurality of movable parts are fixedly connected. In the following description, in order to simplify the description, a case where there are two movable parts is given as a specific example.

FIG. 2 is a schematic diagram when two movable parts are fixedly connected. Each code | symbol in FIG. 2 has shown the following content.
K1: Spring constant of the first stage movable part C1: Damping coefficient of the first stage movable part M1: Mass of the first stage movable part K2: Spring constant of the second stage movable part C2: Second stage movable Damping coefficient M2: Mass of the second stage movable part

  As shown in FIG. 2, when a plurality of movable parts are fixedly connected, they can be regarded as a single connected movable part, and the resonance frequency is determined by K1 + K2, C1 + C2, M1 + M2. One frequency. FIG. 3 is a diagram showing the frequency characteristics of the output voltage by the vibration power generator configured as shown in FIG. As shown in FIG. 3, the frequency characteristics of the output voltage cannot be widened by the vibration generator having the configuration of FIG.

On the other hand, FIG. 4 is a schematic diagram when two movable parts are connected by a spring in the vibration power generator according to Embodiment 1 of the present invention. Each code | symbol in FIG. 4 has shown the following content.
K1: Spring constant of the first stage movable part C1: Damping coefficient of the first stage movable part M1: Mass of the first stage movable part K2: Spring constant of the second stage movable part C2: Second stage movable M2: Mass of the second stage movable part K3: Spring constant by the action of the connecting spring part 5c C3: Damping coefficient by the action of the connecting spring part 5c

  As shown in FIG. 4, when a plurality of movable parts are connected via the connecting spring part 5c, the individual natural frequencies of the first-stage movable part and the second-stage movable part as a whole. It becomes a response characteristic that combines these characteristics. That is, since the plurality of movable portions are coupled by the connecting spring portion 5c, each movable portion is also vibrated at the resonance frequency of the other movable portions, and can generate power.

5 and 6 are diagrams showing frequency characteristics of the output voltage when two movable parts are connected via the connecting spring part 5c in the first embodiment of the present invention. In FIG. 5 and FIG. 6, the individual resonance frequencies adjusted for the first-stage movable section and the second-stage movable section are different, and the following specific characteristics are shown.
Condition of FIG. 5: Resonant frequency of the movable part of the first stage 21.5 Hz
Resonant frequency of the second stage movable part 27.3Hz
Condition of FIG. 6: Resonant frequency of 1st stage movable part 19.5 Hz
Resonant frequency of the second stage movable part 25.5Hz

  When FIG. 3 is compared with FIG. 5 and FIG. 6, for example, an output of 6 mW or more is obtained in FIG. 3 at about 7 Hz between 18 Hz and 25 Hz, whereas in FIG. 5, it is between 16 Hz and 30 Hz. In FIG. 6, a wide band of about 13 Hz between 15 Hz and 28 Hz can be realized. In this way, by adopting the configuration of FIG. 1 in which a plurality of movable parts are connected via the connecting spring part 5c, the frequency range in which a desired power generation efficiency can be obtained can be made wider than in the past. Recognize. That is, a wide band can be realized by combining a plurality of movable parts, each set to a different resonance frequency.

  As a result, it is possible to realize a vibration generator that can deal with vibration sources having various frequencies. Furthermore, it is possible to realize a vibration generator that can generate a desired output voltage even when vibrations having a plurality of frequencies are mixed in the vibration source.

  As described above, according to the first embodiment, as a vibration power generator using a leaf spring, a plurality of movable parts are provided with a configuration including a magnetic spring part capable of adjusting a gap length at both ends in a vibration direction. The structure which connects with a spring is realized. As a result, in order to obtain a desired resonance frequency according to the application, it is possible to individually set the resonance frequencies of the plurality of movable parts and to widen the frequency range in which the desired power generation efficiency can be obtained. Therefore, even in an environment where the natural vibration of the vibration source fluctuates, it is possible to suppress the output voltage from being extremely lowered, and it is possible to widen the application range of the vibration generator.

  In addition, although the specific structure of the vibration generator of this invention was demonstrated using FIG. 1, this invention is not limited to this structure. If a configuration having both the first feature and the second feature described above can be realized, the same excellent effect can be obtained.

Claims (2)

A permanent magnet composed of a cylinder or cylinder;
A coil that is fixedly disposed around the outer periphery of the permanent magnet;
Two magnetic spring portions provided at both axial ends of the permanent magnet via guide rods, each configured as a pair of magnets;
An adjustment mechanism capable of adjusting a distance between magnets of the pair of magnets in each of the two magnetic spring parts;
It is connected to the guide rods provided at both ends of the permanent magnet in the axial direction, respectively, and the movable portion composed of the permanent magnet and the guide rod is prevented from rolling in a plane perpendicular to the axial direction. A vibration generator that generates electric power by relative movement of the permanent magnet and the coil by virtue of the vibration of the permanent magnet in the axial direction.
A plurality of the movable parts composed of the permanent magnet and the guide rod;
A connecting spring part that connects each movable part along the axial direction with an elastic spring material;
Each of the plurality of movable parts has a resonance frequency individually set by selecting the coupling spring part and adjusting the distance between the magnetic poles of the two magnetic spring parts by the adjusting mechanism part. The vibration generator according to claim 1,
The connection spring portion is a magnetic spring portion configured as a pair of magnets.

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