JP7430468B2 - Generator, power generation element, power generation device - Google Patents

Description

The present invention relates to a generator that uses renewable energy, kinetic energy, and vibration, a power generation element, a power generation device that uses the generator, a communication device, and a sensor.

In recent years, power generation methods using natural energy have been attracting attention. In particular, various vibration power generation methods have been devised and made public as power generation methods that contribute to the Internet of Things (IoT).

If there is a generator that uses vibration power generation or a self-power generation sensor, it is possible to construct a small, maintenance-free IoT device that can be used in a variety of applications.
However, most of the methods that have been devised so far have only a small power generation capacity of μW, and their performance has been limited. In particular, many of them do not have the ability to charge electricity storage devices such as lithium batteries and electric double layer capacitors, and in reality, many of them are of little use.

In recent years, it has been discovered that a mixture of Fe and rare earth elements (Tb, Dy, etc.) exhibits a magnetostriction of about 0.1%, and has been put into practical use as a giant magnetostrictive material. Iron-gallium alloys (Fe-Ga) have also attracted attention in recent years as materials that efficiently increase the reverse magnetostriction effect.

Many inventions for constructing power generation devices using the inverse magnetostriction effect of magnetostrictive materials have been published, and their power generation capacity is attracting attention. Many power generation methods using magnetostrictive materials are capable of generating power in the mW class.

However, many of them use special magnetostrictive materials, and the drawback is that they are expensive because mass production methods for the materials have not been established. The reality is that commercialization has not progressed due to the supply and price of magnetostrictive materials.

By configuring a small generator and a highly sensitive, high-output sensor, it can be used for small IoT communication devices, vibration measuring instruments for bridges and roads, and it will become possible to develop products that greatly contribute to society. However, this requires mass production and low cost.

There is a need to provide generators that use renewable energy, kinetic energy, and vibrations that are simple, highly productive, and can be provided at low prices, as well as power generation devices that use these generators, communication devices, sensors, etc. It is being

Patent application 2020-186201 Patent application 2021-169177

The inventor has devised the present invention by carefully examining the patent documents of his own inventions so far, further conducting experiments and research.

In the preceding patent document, Japanese Patent Application No. 2020-186201, the inventor developed a generator that utilizes the inverse magnetostrictive effect of magnetostrictive materials by using spring materials made of multiple magnetic materials to facilitate mass production and improve power generation performance. We have devised a structure for a power generation device that can achieve both.

However, this invention is based on the premise that the coil of the power generation section vibrates due to external vibrations or renewable energy, and there is a problem in that it is difficult to maintain connection reliability between the coil and the external circuit over a long period of time.

In the preceding patent document, Japanese Patent Application No. 2021-169177, the inventor conducted intensive research and experiments, succeeded in obtaining a magnetostrictive effect without using any special magnetostrictive material, and devised a method for receiving external energy. Therefore, he invented an invention that reduces the vibrations applied to the coil.

However, since the device structure becomes larger depending on the size of the coil that determines the output, there is a drawback that it becomes difficult to miniaturize the device as the output increases.

The present invention has been made to solve the above problems.

In the present invention, a magnet that is arranged so as to vibrate in the vicinity of a core magnetic body that is arranged and fixed so as to be included in a coil vibrates, and the magnetic force of the vibrating magnet is applied to the core magnetic body. It is a generator (power generation element) or power generation device in which the direction of the coil is repeatedly reversed and electric power is generated in the coil.

The magnet is interlocked with an elastic body and vibrates periodically, making it more efficient than conventional methods, for example, in power generation using discontinuous renewable energy as an energy source, or vibration power generation in which energy is mainly in the direction of gravity. This enables high power generation.

The structure of the core magnetic body arranged and fixed so as to be included in the coil is the same as the basic structure of an electromagnet, in which the internal core magnetic body becomes magnetized when electricity is passed through the core. Therefore, the power generation method according to the present invention can be called reverse electromagnetic power generation.

In devising the present invention, the inventor earnestly conducted various experiments using a generator manufactured based on the knowledge obtained in the preceding patent application No. 2020-186201 and patent application No. 2021-169177. We examined the relationship between As a result, when a magnet is placed at the center outside the end of an air-core coil and the magnet is moved back and forth perpendicular to the axial direction of the coil and parallel to the coil opening, electricity is generated in the coil. We focused on the fact that it increases and decreases depending on the moving speed of the magnet. (electromagnetic induction). When an elastic body such as a spring or a plate spring is connected to a magnet and an external force is applied to generate simple harmonic motion, electricity with a period is generated in the coil. The inventor conducted further research and conducted similar experiments with a coil containing a magnetic material equivalent to the length of the coil, and discovered that almost three times as much power could be obtained compared to an air-core state. . (Reverse electromagnetic power generation). Furthermore, it was confirmed that the kinetic energy required to generate the same amount of electricity is one-tenth that of a regular generator that generates electricity by moving a magnet inside a coil. It has been found that placing the magnet near the center of the outside of the coil end surface and making it reciprocate (vibrate) parallel to the coil end surface (perpendicular to the coil winding direction) generates the most power. confirmed. We also confirmed that this reciprocating motion (vibration) can generate electricity even when part of the arc motion is used. According to this method, the coil does not need to vibrate, and there is no need to worry about the weight of the coil, so the number of turns and diameter of the coil can be set according to the desired electrical performance. be. The convenience and long-term stability it provides are undeniable. Furthermore, the following phenomena were obtained as knowledge for effectively increasing power generation. 1. The closer the coil end surface is to the magnet, the better, so that the magnet can move freely. 2. If a magnetic material is included in the center of the coil, it is best to create a gap so that the free movement of the magnet is not inhibited by the magnetic attraction between the coil and the magnetic material. 3. The larger the amplitude of the magnet, the higher the power generation will be. 4.Using a magnet with a large magnetic force will increase power generation. 5.The larger the area of the end face of the magnetic material contained within the coil, the better. 6. A magnet can be used instead of a magnetic material, but the output will be lower. Note that the present invention is not limited to the knowledge of the process leading to these ideas.

Although the present invention may be more appropriate as a power generation element in some cases, it is structurally a power generator. It is called a power generation element or a generator as appropriate.

A first means of the present invention for solving the problem includes at least one core and at least one coil, the core is made of a magnetic material, the coil has a power generation section arranged around the core, and at least one coil. One magnet is provided with a magnet vibrating part supported by at least one support member and arranged so as to be able to vibrate, and the core of the power generation part is arranged close to the magnet of the magnet vibrating part. It is a generator that A second means of the present invention is the generator according to the first means, wherein the magnet vibrating section includes the magnet supported by at least one movable member and arranged so as to be able to vibrate. A third means of the present invention is the generator according to the first means, characterized in that the magnet vibrating section includes the magnet supported by at least one elastic member and arranged so as to be able to vibrate. A fourth means of the present invention is the generator according to the first means, in which the magnetic direction of the core of the power generation section is repeatedly reversed in response to magnetic force from the magnet of the magnet vibrating section.

A fifth means of the present invention is the generator according to the first means, characterized in that the core of the power generation section is fixed to the coil.
A sixth means of the present invention is the generator according to the first means, characterized in that the electric power generated is alternating current.

A first aspect of the invention is a generator that receives an external force and generates electricity, wherein the generator includes at least a coil and a magnet, and the magnet is movably disposed near the outer end surface of the coil. It is a generator.

A second aspect of the invention is the generator according to the first aspect, wherein the coil includes a magnetic material.

In a third aspect of the invention, the magnet is connected to an elastic body, and the elastic body is arranged so that the magnet vibrates in parallel to the outer side of the end surface of the coil and in a direction perpendicular to the coil winding direction. The generator according to the first aspect of the invention is characterized in that:

A fourth aspect of the invention is the generator according to the first aspect, wherein the elastic body is a structure including at least a spring or a leaf spring.

A fifth aspect of the invention is the generator according to the first aspect, wherein the external force is renewable energy, kinetic energy, or external vibration.

A sixth aspect of the invention is the generator according to the first aspect of the invention, characterized in that the magnet is vibrated using a mechanism that converts the external force into rotational motion or vertical motion.

A seventh aspect of the invention is the generator according to the first aspect of the invention, wherein the elastic body is deformed under the load of the external force, and the magnet vibrates due to a restoring force generated when the load is removed.

An eighth aspect of the invention is the method according to the first aspect of the invention, characterized in that an elastic force is generated in the elastic body using a mechanism that converts the external force into rotational motion or vertical motion, and the magnet is vibrated. It is a generator.

A ninth aspect of the invention is the generator according to the first aspect of the invention, characterized in that the external force is used to generate an elastic force in the elastic body using a mechanism using a lever principle, a transmission, or the like. .

A tenth aspect of the invention is the generator according to the first aspect, characterized in that a weight is connected to the magnet or the elastic body to adjust the vibration frequency of the magnet.

An eleventh aspect of the invention is a power supply device comprising the generator according to the first aspect of the invention.

A twelfth aspect of the invention is a communication system comprising the power supply device according to the eleventh aspect.

A thirteenth aspect of the invention is a sensing system characterized in that the amount of power generated by the generator according to the first aspect of the invention is used as sensor information.

According to the present invention, it is possible to easily and conveniently configure a small-sized, high-output power generator using renewable energy, kinetic energy, external vibration, or the like as an energy source. In addition, highly reliable power sources, power storage devices, communication devices, sensors, etc. using the generator of the present invention can be provided for applications that require free maintenance. It is also possible to construct large-scale generators using the principles of the present invention. Furthermore, the ultra-small generator of the present invention can also be formed using an ultra-small coil for a printed circuit board. Furthermore, it is suitable as a self-generating sensor that observes the vibration state in the form of a generated waveform, and can also be used as an inexpensive low-frequency observation device.

Conceptual diagram of the invention Perspective view of vibration power generation structure Conceptual diagram of the invention Example of receiving external vibration a) Vertical spring type b) Horizontal spring type c) Vertical leaf spring type d) Horizontal leaf spring type Conceptual diagram of the invention Power generation structure A) Side view B) Top view Example of kinetic energy power generation device Perspective view Conceptual diagram of the invention Perspective view of a structure for generating kinetic energy

2... Magnet, 5... Core magnetic material, 6... Bobbin, 7... Coil, 8... Magnet box, 9... Magnet box lid, 10... Magnet box groove bottom, 11... Bobbin back, 21... Spring, 22... Leaf spring, 29... Keying part, 30... Power generation part, 31... Magnet vibrating part, 32... Magnet movement direction, 33... Coil stand, 34... Power generation part pedestal, 35... Elastic body fixing screw, 36... Magnet vibrating part support, 37... Magnet vibrating unit pedestal, 38... Kinetic energy receiving direction 39... Elastic body for magnet drive 40... Leaf spring set screw, 41... Leaf spring base, 42... Leaf spring, 43... Repelling receiving part, 44... Repelling claw, 45... Repelling Cam, 46...1st gear, 47...power energy receptor, 48...2nd gear, 49...pedestal

Embodiments of the present invention will be described below with reference to the drawings. Identical or corresponding parts in the drawings are denoted by the same reference numerals and their description will not be repeated. Note that the present invention is not limited to these embodiments.

Embodiment 1 of the present invention will be described with reference to FIGS. 1 and 2. This embodiment is a generator that generates electricity by receiving kinetic energy, external force, or external vibration as a power source. Power sources include vibrations generated by natural renewable energy such as wind, water, and wave power, vibrations generated by buildings such as roads, buildings, and bridges, vibrations when machinery operates, and even the press of a button. Human power such as motion can be used.

This generator includes a core magnetic body 5, a coil 7, a bobbin 6, a magnet 2, and a magnet box 8. Although FIG. 1 shows a structure in which the coil 7 is wound around the bobbin 6, it is also possible to wind the coil 7 directly around the core magnetic body 5 without using the bobbin 6. Any known coil structure can be used. The bobbin 6 has a pipe extending in the direction of the winding of the coil 7, and both ends of the coil are fixed with magnetic box lids 9, and the inside is hollow. The core magnetic body 5 is arranged in a rod shape extending in the winding direction of the coil so as to be wrapped in the cavity of the coil 7. This core magnetic body 5 is preferably fixed to the coil 7. This structure is almost the same as an electromagnet in which the magnetic material inside becomes a magnet when electricity is supplied to the coil, and it is also possible to use commonly available electromagnets as they are. Therefore, the power generation method of the present invention can be called reverse electromagnetic power generation.

Although not shown, the coil 7 is connected to wiring that transmits the generated power to an external circuit. The generated electricity is used for electrical equipment such as communication equipment and sensors, and can also be charged with a charging device. The structure, function, operation, etc. of the devices and equipment included in these power generation mechanisms are substantially the same as those of conventionally known power generation mechanisms, so detailed explanations will be omitted here.

A core magnetic body 5 is arranged at the center of the coil 7 and at the same time at the center of the bobbin 6 so as to be included in the coil 7.

The core magnetic material 5 is preferably made of a soft magnetic material, but any material based on a magnetic material can be used. Silicon steel plates, permalloy, etc., which are normally used as the magnetic core material of coils, are suitable, but iron screws, etc., for example, can also be used. Any shape can be used: rod, square, flat plate, or pipe. The length of this core magnetic body 5 is preferably about the same length as the coil 7. The core magnetic body 5 can be fixed directly to the coil 7 by press-fitting or using an adhesive, or it can be press-fitted while being inserted into the bobbin 6 on which the coil 7 is wound. It may be fixed at 6. The structure composed of the coil 7 and the core magnetic body 5 can be said to be the same as the basic structure of an electromagnet. Therefore, all published electromagnet structures can be used. We do not exclude all measures to improve the performance of electromagnets, such as adding a yoke to increase magnetic force. For this reason, the present invention can also be referred to as reverse electromagnetic power generation.

In FIG. 1, the core magnetic body 5 is enclosed in a bobbin 6 and a magnet box 8, and arranged so that there is a slight gap between its end and the magnet 2.
A magnet box 8 is connected to the bobbin 6. A rectangular groove is formed near the center of the magnet box 8, and the cylindrical magnet 2 is movably arranged in the groove.

Although an electromagnet can be used as the magnet 2, a permanent magnet, preferably a neodymium magnet with high magnetic force, is suitable. The shape may be any shape as long as it can move easily in the groove of the magnet box 8, and in addition to the cylindrical shape shown in FIG. 1, square, spherical, etc. may also be used.

To this, the magnet box lid 9, which is shown removed for convenience, is connected to complete the entire configuration.

As a result, when the magnet 2 receives external vibration, it moves parallel to the outside of the coil end surface and moves perpendicular to the coil winding direction. When vibration is applied to the entire generator, the magnet 2 reciprocates within the groove of the magnet box 8 while crossing the core magnetic body 5. Due to this reciprocating motion (vibration) of the magnet 2, the magnetic direction of the core magnetic body 5 is repeatedly reversed by the magnetic force of the magnet 2, and electric power is generated in the coil 7. Although not shown, the wire rod wired to the coil 7 , supplied to the external circuit.

Although not shown, it is also possible to arrange an elastic body such as a spring on the bottom surface 10 of the magnet box groove to increase the speed of movement of the magnet and increase the power generated.

Example 2 will be explained using FIG. 2. It is a diagram in which the elastic bodies of the spring 21 and the leaf spring 22 are fixed in a cantilever structure, and the generator of FIG. 1 is connected to the free end side thereof. Regarding the embodiment of FIG. 2, descriptions and symbols of parts that overlap with those of FIG. 1 will be omitted. When the elastic body of the spring 21 and the leaf spring 22 behaves like a spring oscillator by receiving external vibration, the generator shown in Fig. 1 vibrates, and the internal magnet 2 vibrates, and the magnet 2 moves across the core magnetic body 5. It reciprocates within the groove of the magnet box 8. Due to this movement of the magnet 2, the magnetic direction of the core magnetic body 5 is repeatedly reversed under the magnetic force of the magnet 2, and electricity is generated in the coil 7.

An elastic body is connected to the back surface 11 of the bobbin in FIG. 1, and it is shown that it vibrates mainly in the direction of the arrow when subjected to external vibration.

A) and b) are examples in which an elastic spring 21 is used to receive external vibrations. This structure is mainly effective against vibrations in which the direction of shaking is uncertain, such as mechanical vibrations and vibrations of structures.

c) and b) are examples in which an elastic plate spring 22 is used to receive external vibrations. Since the amplitude direction is fixed, it is suitable for use in places where vibrations occur in the direction of gravity.

Note that the elastic body is not necessarily limited to metal as long as it can convert vibration energy into elastic force, and elastic materials or structures such as rubber or resin may be used to receive the vibration energy.

Example 3 of the generator of the present invention will be described using FIG. 3.

FIG. 3 is a schematic diagram of Example 3 of the present invention.

Regarding the embodiment shown in FIG. 3, the same reference numerals are used for the same parts as those in FIGS. 1 and 2, and the explanation thereof is omitted.

The present embodiment is generally configured with a magnet vibrating section 31 and a power generation section 30. A) in FIG. 3 is a side view, and B) is a top view. Here, explanation will be given using the side view of A).

The magnet vibrating section 31 is roughly composed of a magnet 2, a magnet driving elastic body 39, a magnet vibrating section support 36, and a magnet vibrating section pedestal 37. The magnet drive elastic body 39 has a single-beam structure in which an elastic material is stretched into a plate shape and the end portion is fixed to the magnet vibrating section support 36 with an elastic body fixing screw 35. A magnet 2 is arranged near the end on the free end side. The magnet 2 in a stationary state is located close to the core magnetic body 5 of the power generation section 30 by the magnet vibrating section support 36. In FIG. 3, the magnet 2 is arranged so as to face the end face of the core magnetic body 5, but for example, it is also possible to extend the core magnetic body 5 and arrange it close to the side surface of the core magnetic body 5. .

The magnet driving elastic body 39 is preferably made of a magnetic metal with spring properties, but does not necessarily need to have magnetism. Therefore, it is also possible to use elastic materials such as resin or rubber instead of metal. The shape is not limited to a plate shape, but may also be a rod shape or a spring shape, and any structure that can obtain vibration and periodicity can be used. It is also possible to add a separate mechanism such as a key-pressing part to make it easier to receive energy. Furthermore, it is also possible to add a weight or the like to adjust the natural frequency of the magnet driving elastic body 39, or to adjust the spring force by providing a bending part.

Components of the power generation section 30 that are approximately the same as those described in FIG. The power generation section 30 is roughly composed of a coil 7, a bobbin 6, a core magnetic body 5, a coil stand 33, and a power generation section pedestal 34.

The core magnetic body 5 extends into a rod shape and is arranged and fixed so as to be enclosed in the bobbin 6 and the coil 7, with both ends slightly protruding from the bobbin. The bobbin 6 and the coil 7 are fixed to a power generation unit base 34 by a coil base 33.
The power generation unit pedestal 34 is arranged so that the end position of the core magnetic body 5 is close to the stationary magnet 2 of the magnet vibrating unit 31.

The magnet 2 of the magnet vibrating section 31 acts as a weight on the free end side of the single beam structure. It is also possible to further attach a weight of another material to the magnet 2. When the kinetic energy is transmitted in the kinetic energy receiving direction 38, the magnet driving elastic body 39 is deformed and vibrates due to the elastic force. Alternatively, the load may be unloaded and vibrate. As a result, the position of the magnet 2 vibrates in the moving direction 32 of the magnet 2, and the magnetic direction of the core magnetic body 5 is repeatedly reversed under the magnetic force of the magnet 2, and power is generated in the coil 7. If the kinetic energy is, for example, an earthquake or the shaking of a structure, the entire generator will shake, and this shaking will act as a weight on the free end of the magnet 2, which will be pulled downward by gravity and upward by inertia. The pushing force acts, and the magnet drive elastic body 39 behaves as a spring vibrator. Then, periodic vibration occurs in the magnet 2, and the magnetic direction of the core magnetic body 5 is repeatedly reversed under the magnetic force of the magnet 2, and power is generated in the coil 7. Although not shown, the generated power is supplied to an external circuit by a wire wired to the coil 7.

The closer the distance between the stationary magnet 2 and the core magnetic body 5 becomes, the higher the voltage generated by the power generation unit 30 when the magnet 2 vibrates. However, if you get too close, a braking effect due to magnetic force will occur, shortening the vibration time (period) and reducing the amount of power. However, this is not the case if the kinetic energy is continuous. Therefore, it is desirable to determine the distance between the stationary magnet 2 and the core magnetic body 5 depending on the quality of kinetic energy and the desired power state.

There is no problem whether the magnet vibrating unit pedestal 37 and the power generation unit pedestal 34 are separated or the same. In this case, it is not necessary to use a magnetic material.

The magnet driving elastic body 39 has a natural frequency when vibrating. When the entire generator vibrates due to external vibration, which is kinetic energy, the closer the frequency of the external vibration is to the natural frequency of the magnet drive elastic body 39, the larger the amplitude of the magnet drive elastic body 39 becomes, and the amount of power generated increases. also becomes larger. The inventor has confirmed through experiments that when these two frequencies approach each other and reach a resonance state, the amplitude is greatest and the amount of power generated increases by more than 10 times.

Although not shown in the drawings, a natural vibration frequency adjustment mechanism may be added to the magnet drive elastic body 39 to allow the position of the magnet 2 or an additional weight to be changed or added. Thereby, the natural vibration frequency of the magnet drive elastic body 39 can be adjusted to match the frequency of external vibration, and the power generation efficiency of the generator can be increased. Furthermore, it can also be used to avoid destruction due to resonance. The natural vibration frequency adjustment mechanism is not shown because it is a known technique.

Example 4 of the present invention will be described using FIG. 4. Figure 4 shows the power generation system of the present invention, which is equipped with a mechanism that converts kinetic energy into rotational energy, drives a key-pressing device through a transmission, and provides kinetic energy to a kinetic energy receiving section (a mechanism that includes an elastic body that vibrates a magnet). This is an example of a machine.

Regarding the embodiment of FIG. 4, parts that overlap with those of FIGS. 1, 2, and 3 are given the same reference numerals, and their explanations are omitted. In addition to this example, methods for converting and utilizing kinetic energy include a transmission, a mechanism that uses the lever principle, a mechanism that buffers energy such as a mainspring, and a vibration generation mechanism that changes vibration to a constant frequency. Mechanisms used to transmit kinetic energy can be considered, such as: Any of these conventionally known mechanisms can be used. Therefore, detailed explanation here will be omitted.

When the kinetic energy converted into rotational motion is input to the power energy receiving section 47, the first gear 46 rotates, and the second gear 48, which has an increased number of teeth, rotates. The shaft connected to the second gear 48 further rotates the connected flip cam 45.

The flip pawl 44 provided with the flip cam 45 applies a load to the flip receiving portion 43 of the leaf spring 42 by rotation, causing it to deform. When it rotates further and the flipping claw 44 comes off the flipping receiving part 43, the deformation applied to the leaf spring 42 is released and the leaf spring 42 vibrates.

Note that a one-way clutch (not shown) is fitted inside the flip cam.
With this configuration, even if the kinetic energy from natural energy is small and discontinuous, the leaf spring 42 can be sufficiently deformed and repelled.

The leaf spring 42 is designed to surround the coil 7 and the bobbin 6, and has a single beam structure with one end fixed. A magnet 2 is provided in the center of the coil 7, at a position facing a core magnetic body 5 which extends in a rod shape and has both ends slightly protruding, leaving a slight gap. The side provided with the magnet 2 is the free end of the leaf spring 42 and is near the repelling receiving part 43.

When the leaf spring 42 vibrates, the magnet 2 also vibrates accordingly. This vibration vibrates almost perpendicular to the coil winding direction and almost parallel to the end face of the magnetic material 5, and the magnetic direction of the core magnetic material 5 is repeatedly reversed, generating electric power in the coil 7. , is supplied to an external circuit by a wire wired to the coil 7 (not shown).

Note that the vibration of the leaf spring 42 behaves as a spring vibrator.

Example 5 of the present invention will be described using FIG. FIG. 5 is a perspective view of an example in which the direction in which the magnet driving elastic body 39 is attached using a cantilever beam is changed, and the way the magnet 2 swings is changed. The magnet drive vibrating body 39 is vibrated by hitting the keying portion 29 of the magnet drive elastic body 39 with a rotor connected to a windmill or the like. The process up to power generation is the same as in Example 3, so it will be omitted. Regarding the embodiment shown in FIG. 5, the same reference numerals are used for parts that overlap with those in FIGS. 1, 2, 3, and 4, and the description thereof is omitted.

In any of the examples shown in FIGS. 1, 2, 3, 4, and 5 according to Examples 1.2, 3, 4, and 5, multiple generators are electrically connected to obtain large output. can be done, but the explanation will be omitted.

The generator, power generation device, and sensor of the present invention can be produced using common materials, simple structures, and common processing techniques, and can be made smaller and lower in price through mass production. As a result, it has the potential to be widely used not only for special purposes but also as a consumer product.

Claims (1)

A power generation unit comprising at least one core and at least one coil, the core being made of a magnetic material, the coil being fixedly arranged around the core via a coil bobbin , and the power generation unit comprising the coil and the core. and at least one magnet, the magnet is movably disposed in a magnet box connected to the coil bobbin so as to face the core with a slight gap, and the magnet A generator and a sensor characterized in that the magnets vibrate by receiving the same external vibration .

Images