JP2015180134A - Vibration power generator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a vibration power generator capable of easily performing adjustment for obtaining a desired resonance frequency corresponding to usage, and also capable of materializing improvement of strength against acceleration.SOLUTION: This vibration power generator includes permanent magnets (1a, 1b) formed in a cylinder or a cylindrical shape, and a coil (2) fixedly disposed on the periphery of the permanent magnets while having a space therebetween, and generates power by relative motion of the permanent magnets and coils, that is caused when the permanent magnets vibrate in the axial direction thereof. The generator also includes two magnetic spring parts (5a, 5b) provided at both end parts of the permanent magnet in the axial direction thereof through guide rods (4a, 4b), an adjustment mechanism part (16) capable of adjusting a distance between a pair of magnets in each of the magnetic spring parts, and two blade springs (3a, 3b) for suppressing rolling of a movable part composed of the permanent magnet and the guide rod in a plane perpendicular to the axial direction.

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 easily adjusting a resonance frequency.

  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. In addition, there was a problem with the strength when a higher acceleration than specified was applied.

  The present invention has been made to solve the above-described problems, and can be easily adjusted to obtain a desired resonance frequency according to the application, and can improve mechanical strength against acceleration. The objective is to obtain a vibration generator that can achieve the above.

  A vibration generator according to the present invention includes a permanent magnet configured in a columnar shape or a cylindrical shape, and a coil that is fixedly disposed at an outer periphery of the permanent magnet with a space therebetween, and the permanent magnet vibrates in an axial direction. 2 is a vibration generator that generates electric power by relative movement between a permanent magnet and a coil, and is provided with guide rods at both ends in the axial direction of the permanent magnet, each of which is configured as a pair of magnets. And a guide mechanism provided at both ends of the permanent magnet in the axial direction, the permanent magnet and the guide, respectively. The movable part made of a rod further includes two leaf springs that suppress rolling in a plane perpendicular to the axial direction.

  According to the present invention, in the vibration power generator using a leaf spring, the both ends of the vibration direction are provided with magnetic spring portions that can adjust the gap length, and have a mechanism that can change the resonance frequency in a non-contact manner. It is possible to obtain a vibration generator that can be easily adjusted to obtain a desired resonance frequency according to the application and that can improve the mechanical strength against acceleration.

It is a schematic sectional drawing for demonstrating the structure 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 adjusting the distance between magnets of the magnetic spring part in Embodiment 1 of this invention to 30 mm and 5 mm, and changing a frequency.

  The present invention is technically characterized in that, in a vibration generator using a leaf spring, magnetic spring portions capable of adjusting the gap length are provided at both ends in the vibration direction. By providing such a magnetic spring portion, it is not possible to obtain with the conventional technology that it is possible to easily adjust the resonance frequency and to improve the mechanical strength when acceleration is applied to the vibration generator. 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.
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 according to the first embodiment shown in FIG. 1 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, and a top plate 11. The upper plate 12 for magnet attachment, the middle plate 13, the lower plate 14 for magnet attachment, the bottom plate 15, and the frequency adjustment mechanism section 16 are provided.

  In FIG. 1, columnar or cylindrical permanent magnets (hereinafter referred to as magnets) 1a and 1b are arranged 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. 2 is a diagram showing the configuration of the leaf springs 3a and 3b in the first embodiment of the present invention. The leaf springs 3a and 3b in the first embodiment shown in FIG. 2 have 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. Is formed.

  The hole H1 at the center corresponds to the connection with the guide rods 4a and 4b shown in FIG. 1, 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. 1, the magnets 1 a and 1 b vibrate in the vertical direction on the paper surface of FIG. 1 due to the vibration energy of the external environment, but the rolling that is orthogonal to the vertical direction is suppressed by the action of the slit S. The Rukoto.

  Next, returning to FIG. 1, the magnetic spring portions 5a and 5b and the frequency adjusting mechanism portion 16 which are technical features of the present application will be described. The magnetic spring portions 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. 1). 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. 3 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 to 30 mm and 5 mm in the first embodiment of the present invention. As shown in FIG. 3, the output voltage of the vibration generator of the present invention has a mountain-shaped frequency characteristic that is maximum at 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 the present invention 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.

  As described above, according to the first embodiment, as a vibration power generator using a leaf spring, a configuration is provided in which magnetic spring portions capable of adjusting the gap length are provided at both ends in the vibration direction. As a result, adjustment for obtaining a desired resonance frequency according to the application can be easily performed. Furthermore, even when a strong acceleration exceeding a specified value is applied, the strength is sufficient to prevent mechanical breakage, and an effect of preventing shaking when the acceleration is applied can be obtained.

  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 satisfying the technical feature of “a vibration generator using a leaf spring is provided with a magnetic spring part capable of adjusting the gap length at both ends in the vibration direction” can be realized, the same excellent effect can be obtained. it can.

  1a, 1b Permanent magnet (magnet), 2 coils, 3a, 3b leaf spring, 4a, 4b guide rod, 5a, 5b magnetic spring part, 10 frame, 11 top plate, 12 magnet mounting top plate, 13 middle plate, 14 Lower plate for magnet attachment, 15 bottom plate, 16 frequency adjustment mechanism.

A vibration generator according to the present invention includes a permanent magnet configured in a columnar shape or a cylindrical shape, and a coil that is fixedly disposed at an outer periphery of the permanent magnet with a space therebetween, and the permanent magnet vibrates in an axial direction. 2 is a vibration generator that generates electric power by relative movement between a permanent magnet and a coil, and is provided with guide rods at both ends in the axial direction of the permanent magnet, each of which is configured as a pair of magnets. And a guide mechanism provided at both ends of the permanent magnet in the axial direction, the permanent magnet and the guide, respectively. movable portion composed of rod, further comprising a two leaf springs refrains from rolling in a plane perpendicular to the axial direction, adjustment mechanism portion, when adjusting the direction to narrow or direction to widen the distance between the magnets , Each magnet distance of the two magnetic spring unit, a shall simultaneously, and having a regulating configurable in the same direction.

Claims (2)

A permanent magnet composed of a cylinder or cylinder;
A vibration generator that generates electric power by relative movement between the permanent magnet and the coil by virtue of the permanent magnet vibrating in the axial direction. There,
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 further comprising two leaf springs. The vibration generator according to claim 1,
The adjustment mechanism has a configuration capable of adjusting the distances between the magnets in the two magnetic spring portions simultaneously and in the same direction when adjusting the distance between the magnets in the direction of increasing or decreasing the distance. Machine.

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