JP2012151982A - Vibration power generator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibration power generator for converting kinetic energy by vibrations accompanied by reciprocation to electric power, which is excellent in electric power conversion efficiency even when a housing is small-sized and is capable of increasing an output voltage by easily changing a resonance frequency of the vibration power generator.SOLUTION: For the vibration power generator, a magnet body includes two first poles respectively connected to both end faces of a magnet, each fixed body includes a buffer magnet for making reaction act with the magnet body and a second pole connected to the buffer magnet so as to get close to the magnet body on the side of the inner surface of a housing, and the first pole of the magnet body includes a peripheral part for stipulating the outer diameter of the first pole and a center projection part which is thicker than the peripheral part and gets closer to the second pole of the fixed body than the peripheral part.

Description

  The present invention relates to a vibration generator that converts kinetic energy due to vibration accompanied by reciprocation into electric power, and more particularly to a vibration generator that is excellent in power conversion efficiency and can increase output voltage even in a small casing.

  In a vibration generator that converts kinetic energy into electric power, when a person carries it or attaches it to a vibrating device, it generates a reciprocating vibration in the internal vibrating body, and the kinetic energy is converted with high conversion efficiency. There is a demand for conversion to electric power. In particular, a vibration generator including a reciprocating magnet or a reciprocating coil is disadvantageous in that the power generation efficiency tends to be low due to the limitation of the coil length or the configuration of the magnetic circuit when downsizing. There is a point. Therefore, conventionally, various vibration generators have been proposed to solve these problems.

  Conventionally, the battery includes a rechargeable battery, a cylindrical coil, a rod-like permanent magnet that is inserted into the axial core portion of the coil and is held by a spring so as to be movable in the axial direction, and a rectifier. In the portable generator that rectifies the AC voltage generated in the coil by the axial vibration of the permanent magnet based on vibration and swing when being carried by the rectifier and charges the battery with the rectified DC voltage, A portable type characterized in that an axial resonance frequency of a permanent magnet system composed of the permanent magnet and the spring is approximately matched with an average period of a main vibration source that generates the axial vibration when being carried. There is a generator. (Patent Document 1).

  An electromechanical device for converting mechanical vibration energy into electric energy, which is a velocity-damping resonator having a damping coefficient and a resonance frequency, and electric power output by the electromechanical device A power detector for detecting the power, a control device, and an attenuation coefficient adjuster for adjusting the attenuation coefficient of the electromechanical device, wherein the control device detects the power detected by the power detector. There is an electromechanical generator configured to control the attenuation coefficient adjuster according to an output (Patent Document 2).

JP 2002-374661 A (FIGS. 1 to 5) JP-T 2008-536470 (FIGS. 1-6)

  In general, in the electrodynamic vibration generator as described in Patent Document 1 or 2, the resonance frequency of the magnet body that vibrates the vibration generator and the vibration frequency of the reciprocating motion that excites vibration in the vibration generator are obtained. If they do not substantially match, there is a problem that it is difficult to extract a large current and a large voltage because the reciprocating speed of the magnet body is not maximized. The resonance frequency of the magnet body of the vibration generator is determined by the weight of the magnet body, the elastic force of the elastic body provided at both ends of the reciprocating motion, or the repulsive force of the repelling magnet that repels the magnet body. Since it is determined by the elastic force, there is a problem that it is substantially difficult to set the resonance frequency of the vibration generator to an arbitrary value in advance or to change the resonance frequency of the vibration generator after manufacturing.

  The present invention has been made to solve the above-described problems of the prior art, and an object of the present invention is related to a vibration generator that converts kinetic energy due to vibration accompanied by reciprocation into electric power, and the resonance frequency of the vibration generator. It is an object of the present invention to provide a vibration power generator that can easily change the power generation efficiency and that is excellent in power conversion efficiency and can increase the output voltage even in a small casing.

  The vibration generator according to the present invention includes a coil, a cylindrical casing around which the coil is wound, a fixed body provided at each end of the casing, and a magnetized magnet. A magnet body installed so as to be capable of reciprocating along the inner surface of the housing, and the magnet body has two first poles respectively connected to both end faces of the magnet, A first magnet pole having a buffer magnet for applying a repulsive force to the magnet body and a second pole coupled to the buffer magnet so as to be accessible to the magnet body on the inner surface side of the housing However, it has the peripheral part which prescribes | regulates the outer diameter of a 1st pole, and the center convex part which is thicker than the thickness of a peripheral part and approaches the 2nd pole of a fixing body rather than a peripheral part.

  Preferably, in the vibration power generator of the present invention, the outer diameters of the buffer magnet and the second pole of the fixed body are smaller than the outer diameter of the first pole of the magnet body.

  Preferably, in the vibration power generator according to the present invention, the buffer magnet and the second pole are fixed at positions deviated from the radial center of the fixed body.

  Preferably, in the vibration power generator according to the present invention, the fixed body includes a displacement mechanism that moves the buffer magnet and the second pole in the radial direction or the circumferential direction and fixes them at an arbitrary position.

  Preferably, in the vibration power generator of the present invention, a plurality of coils are provided in the housing, and the plurality of coils are connected in series and / or in parallel.

  The operation of the present invention will be described below.

  The vibration generator according to the present invention includes a coil, a cylindrical casing around which the coil is wound, a fixed body provided at each end of the casing, and a magnetized magnet. And a magnet body installed so as to be capable of reciprocating along the inner surface of the casing. In this vibration generator, when a magnet body installed so as to be able to reciprocate moves, the magnetic field of the magnet changes, and each coil provided corresponding to the range in which the magnet body reciprocates moves to each coil by electromagnetic induction. An electromotive force is generated.

  Here, the magnet body has two first poles respectively connected to both end faces of the magnet, and each fixed body is a buffer that applies a repulsive force to the magnet body on the inner surface side of the housing. A magnet, and a second pole coupled to the buffer magnet so as to be accessible to the magnet body. Further, the first pole of the magnet body includes a peripheral portion that defines the outer diameter of the first pole, and a central convex portion that is thicker than the peripheral portion and is closer to the second pole of the fixed body than the peripheral portion. Have.

  The resonance frequency of the magnet body of this vibration generator is determined by the weight of the magnet body and the elastic force determined by the repulsive force of the fixed body buffer magnets provided at both ends of the casing. If the repulsive force by the magnet body and the buffer magnet of the fixed body is increased, the resonance frequency is increased, and if the repulsive force is decreased, the resonance frequency is decreased. Since the first pole of the magnet body has a central convex portion that is thicker than the peripheral portion and is closer to the second pole of the fixed body than the peripheral portion, the central convex portion of the first pole is the second pole. By adjusting the relative area approaching, the elastic force determined by the repulsive force can be adjusted.

  Therefore, in the vibration power generator of the present invention, the outer diameters of the buffer magnet and the second pole of the fixed body are made smaller than the outer diameter of the first pole of the magnet body, or the buffer magnet and the second pole are made the diameter of the fixed body. The elastic force determined by the repulsive force acting between the first pole of the magnet body and the second pole of the stationary body can be adjusted by means such as fixing at a position deviated from the center of the direction. The resonance frequency of the magnet body of the machine can be adjusted.

  In addition, the vibration generator according to the present invention has a magnet body within a predetermined range as long as the fixed body includes a displacement mechanism that moves the buffer magnet and the second pole in the radial direction or the circumferential direction and fixes them at an arbitrary position. The relative position between the first pole and the second pole of the fixed body can be adjusted. Therefore, the resonance frequency of the magnet body of the vibration generator can be adjusted within a predetermined range after manufacturing, and the resonance frequency of the magnet body that the vibration generator vibrates and the vibration frequency of the reciprocating motion that excites vibration in the vibration generator Are substantially matched, the speed of reciprocation of the magnet body is maximized, so that a large current and a large voltage can be taken out and the power generation efficiency can be improved.

  In the vibration power generator of the present invention, a plurality of coils may be provided in the housing, and the plurality of coils may be connected in series and / or in parallel. The winding direction of the plurality of coils, or the polarity of series connection and / or parallel connection is reversed according to the direction of the magnetic flux from the magnet body. By providing a plurality of coils at a position where the magnetic flux of the magnet body is effectively interlinked, that is, a position where the magnetic flux density is high, the output voltage at the coil can be further increased. In addition, if a plurality of coils are connected in series and / or in parallel, the output voltage can be made more continuous, and the power conversion efficiency can be increased even in a small casing. Can be further enhanced.

  Relating to vibration generators that convert kinetic energy due to vibration with reciprocation into electric power, the resonance frequency of the magnet body of vibration generators can be adjusted, and even in a small casing, power conversion efficiency is excellent and output voltage is increased The vibration generator which can be provided can be provided.

It is sectional drawing explaining the vibration generator 1 by preferable embodiment of this invention. Example 1 It is a figure explaining the fixed body 4 and the resonance frequency adjustment mechanism 5 of the vibration generator 1 by preferable embodiment of this invention. Example 1 It is a figure explaining the connection of the rectifier of 1 A of vibration generators by preferable embodiment of this invention. Example 1 It is sectional drawing explaining the case where the resonance frequency is adjusted in the vibration generator 1 by preferable embodiment of this invention. Example 1 It is a wave form diagram explaining the magnetic field near the stationary body 4 and the buffer magnet 5 of the vibration generator 1 by preferable embodiment of this invention. Example 1 It is a wave form diagram explaining the vibration generator 1B by other preferable embodiment of this invention. (Example 2)

  Hereinafter, although the vibration generator by preferable embodiment of this invention is demonstrated, this invention is not limited to these embodiment.

  FIG. 1 is a diagram illustrating a vibration generator 1 according to a preferred embodiment of the present invention. Specifically, FIG. 1 is a cross-sectional view along the center axis in the vertical direction shown in the figure. In the vibration power generator 1, the magnet body 10 that is a vibrator moves in the direction of the center axis and vibrates. 2 is a diagram for explaining the fixed body 4 and the resonance frequency adjusting mechanism 5 provided at both ends of the vibration generator 1, FIG. 2 (a) is a plan view thereof, and FIG. 2 (b) is a sectional view. FIG. Furthermore, FIG. 3 is a diagram for explaining the connection of the vibration generator 1A and the vibration generator 1A including the rectifier. In addition, as will be described later, a part of the structure of the vibration generator 1 and an internal structure are omitted.

  The vibration power generator 1 includes a coil 2, a cylindrical casing 3 around which the coil 2 is wound, a fixed body 4 and a resonance frequency adjusting mechanism 5 provided at both ends of the casing 3, and a magnetized magnet. 11 and a magnet body 10 that can be reciprocated along the inner surface of the housing 3 between each fixed body 4 and 11. The vibration generator 1 of the present embodiment is a small and light vibration generator having a substantially cylindrical shape having a major axis length of about 65 mm and a minor axis diameter of about 34 mm. For example, when the vibration generator 1 vibrates at an illustrated displacement Z0 due to external vibration, the magnet body 10 that is a vibrator vibrates at the displacement Z1 therein, so the vibration generator 1 is caused by the vibration of the magnet body 10. Kinetic energy can be converted into electric power.

  The magnet body 10 of the present embodiment includes a cylindrical rare earth magnet 11 having an outer diameter of about 24 mm and a length of about 20 mm. As shown in FIG. 1, the magnet 11 of the magnet body 10 is magnetized so that different magnetic poles (N pole, S pole) appear in the vibrating vertical direction. The rare earth magnet is an Nd—Fe—B type neodymium magnet or an Sm—Co type samarium cobalt magnet, which has a large maximum energy product (BH) max, An Nd—Fe—B rare earth magnet having a larger magnetization and coercive force and a strong coercive force even in a small volume may be used. Of course, the magnet 11 may be a ferrite magnet.

  As shown in FIG. 1, the magnet body 10 includes first poles 12 a and 12 b that are soft iron members connected to both end surfaces of the magnet 11. The first poles 12a and 12b are formed in a convex shape having a peripheral portion that is approximately equal to the diameter of the magnet body 10 and that defines the outer diameter thereof, and a thickness (about 10 mm) larger than the thickness of the peripheral portion (about 5 mm). Central convex portion 13a or 13b. In the case of the present embodiment, the diameter of the central convex portion 13a or 13b of the first poles 12a and 12b is about 10 mm.

  The cylindrical casing 3 is a hollow cylinder made of a non-magnetic material. In this embodiment, the cylindrical housing 3 is a straight pipe made of a resin molded part having an inner diameter of about φ24.6 mm. 10 is installed so that it can reciprocate. A coil 2 a and a coil 2 b are wound around the outer surface of the cylindrical housing 3 and are connected in series to constitute the coil 2. The coil 2a and the coil 2b are coils formed by winding a copper wire having a diameter of about 0.18 mm into about 14 layers with a winding width of about 18 mm. As shown in the drawing, the coil 2a and the coil 2b are wound around the casing 3 apart from each other in the vertical direction, and are connected in series so that currents flow in opposite directions of rotation in the coils 2a and 2b, respectively. The coil 2 outputs the coil electromotive force generated in the coil 2 a and the coil 2 b to the output terminal 21.

  The fixed bodies 4a and 4b are non-magnetic resin molded parts, and the fixed bodies 4a and 4b are fixed to both ends of the housing 3 with screws or an adhesive. As shown in FIG. 2, the fixed bodies 4 a and 4 b are provided with resonance frequency adjusting mechanisms 5 a and 5 b in which the buffer magnet 6 and the second pole 7 are arranged on the inner surface side of the housing 3 where the magnet body 10 reciprocates. Have each.

  The resonance frequency adjusting mechanisms 5a and 5b include buffer magnets 6a and 6b that apply a repulsive force to the magnet body 10, and second poles 7a and 7b that are coupled to the magnet body 10 so as to be accessible. And having. The buffer magnets 6a and 6b, which are buffer bodies, prevent the magnet body 10 from moving and colliding with the fixed bodies 4a or 4b located at both ends of the housing 3 and being destroyed by impact. Since the magnet body 10 repels the buffer magnet 6a or 6b, the first poles 12 and 12b, which are magnetic bodies, are in close contact with the second poles 7a and 7b connected to the buffer magnet 6a or 6b, respectively. To prevent it.

  Since the fixed bodies 4a and 4b provided on the upper and lower sides of the casing 3 and the configurations of the respective resonance frequency adjusting mechanisms 5a and 5b are common, the following description will be made in common as the fixed body 4 and the resonant frequency adjusting mechanism 5. . The resonance frequency adjusting mechanism 5 provided in the fixed body 4 can adjust the resonance frequency of the magnet body 10 of the vibration power generator 1. For example, the buffer magnet 6 of the resonance frequency adjusting mechanism 5 is a disk-shaped rare earth magnet having a diameter of about 10 mm and a thickness of about 1.2 mm. The second pole 7 connected to the buffer magnet 6 is a disk-shaped soft iron member having a diameter of about 10 mm and a thickness of about 1.2 mm. The outer diameters of the buffer magnet 6 and the second pole 7 included in the fixed bodies 4 a and 4 b are smaller than the outer diameter of the first pole 12 of the magnet body 11. The fixed body 4 is provided with a slide groove 8 so that the coupled buffer magnet 6 and the second pole 7 can move in the Y direction shown in the figure, and the slide groove 8 has an engaging portion coupled to the buffer magnet 6. 9 is slid to a predetermined position and engaged so as to be able to move and stop. The engaging portion 9 is a resin rod-like member, and one end protrudes outside the fixed body 4 and can be moved in the Y direction shown in the drawing.

  A vibration generator 1 </ b> A shown in FIG. 3 is a vibration generator including the vibration generator 1 described above and the rectifier 22. The vibration generator 1 outputs a coil electromotive force generated in the coil 2 to the output terminal 21. The rectifier 22 is a full-wave bridge rectifier circuit that connects the input side to the output terminal 21 of the vibration power generator 1, and converts the AC voltage into a DC voltage by full-wave rectification. That is, in the vibration power generator 1 </ b> A, the output terminal 21 of the vibration power generator 1 is connected to the rectifier 22 and the output is connected to the output terminal 23.

  When an external force is applied and the vibration power generator 1 vibrates at the displacement Z0, the magnet body 10 that is a vibrator vibrates at the displacement Z1 therein. The magnet body 10 installed so as to be able to reciprocate along the inner surface of the housing 3 moves at a certain relative speed in the inner space of the coils 2 a and 2 b wound around the housing 3. Since the magnet body 10 is magnetized so as to form a DC magnetic field, when the magnet body 10 passes inside the coils 2a and 2b, changes in the DC magnetic field generated by the magnet body 10 in the coils 2a and 2b, respectively. An electromotive force that tries to cancel out is generated in proportion to the relative speed. In the vibration power generator 1 of the present embodiment, the magnet body 10 repeatedly vibrates in the vertical direction shown in FIG. 1 due to external vibration, so that the lower coil 2a has a lower end of the magnet body 10 in the lower coil 2a. The upper side of the magnet body 10 vibrates and goes in and out of the upper coil 2b. The vibration generator 1 can convert the kinetic energy generated by the vibration of the magnet body 10 into electric power as an AC coil electromotive force.

  Since the coil 2 a and the coil 2 b are connected in series in the opposite directions as described above, the absolute value of the relative velocity due to vibration between the magnet body 10 and the coil 2 is the same as that of the housing 3. It becomes large when moving near the center, and on the other hand, it becomes small when it reaches the fixed bodies 4a and 4b on the end side of the housing 3 and turns back. Therefore, when the magnet body 10 vibrates sinusoidally, the waveform of the coil electromotive force output to the output terminal 21 connected to the coil 2 of the vibration power generator 1 moves around the center of the housing 3. On the other hand, it becomes large (sinusoidal antinode), and on the other hand, when it reaches the fixed bodies 4a and 4b on the end side of the housing 3 and turns back (when the speed becomes minimum), it becomes small (sinusoidal node). ). The coils 2a and 2b are connected in series so that currents flow in opposite directions of rotation, but may be connected in parallel.

  FIG. 4 is a cross-sectional view illustrating a case where the resonance frequency is adjusted in the vibration power generator 1. In the case of the present embodiment, the resonance frequency adjusting mechanism 5 is realized as a displacement mechanism in the Y direction of the buffer magnet 6 and the second pole 7 provided in the fixed body 4. In the case illustrated in FIG. 4, the buffer magnet 6 and the second pole 7 are fixed at predetermined positions deviated in the Y direction from the radial center of the fixed body 4. The resonance frequency when the magnet body 10 of the vibration generator 1 vibrates is determined by the weight of the magnet body 10 and the elastic force determined by the repulsive force of the buffer magnets 6 of the fixed body 4 provided at both ends of the housing 3. When the repulsive force is converted into the stiffness of the primary resonance system and considered, the resonance frequency is proportional to the square root of the stiffness ((1/2) th power). Therefore, by displacing the buffer magnet 6 and the second pole 7 by the displacement mechanism, if the repulsive force by the magnet body 10 and the buffer magnet 6 of the fixed body 4 is increased, the resonance frequency is increased, and if the repulsive force is decreased. The resonance frequency is lowered.

  FIG. 5 is a diagram for explaining the magnetic field near the buffer magnet 6 on the lower side of the vibration generator 1. FIG. 5A shows the case where the buffer magnet 6 and the second pole 7 are located at the radial center of the fixed body 4 as in FIG. 1, and FIG. 5B shows the same as in FIG. In this case, the buffer magnet 6 and the second pole 7 are located at a position deviated by about 5 mm in the Y direction from the radial center of the fixed body 4. Yes. Since the repulsive force by the magnet body 10 and the buffer magnet 6 of the fixed body 4 varies depending on the magnetic flux density of the magnetic field generated by each magnet and the relative distance, the magnet body 10 vibrates and the magnet body 10 Comparison is made assuming a position where the distance between the first pole 12 connected to the second pole 7 and the second pole 7 connected to the buffer magnet 6 is 10 mm.

  Here, the first pole 12 of the magnet body 10 has a peripheral portion that defines the outer diameter of the first pole 12, a thickness larger than the thickness of the peripheral portion, and the buffer magnet 6 and the first magnet of the fixed body 4 than the peripheral portion. And a central convex portion 13 approaching the two poles 7. When the buffer magnet 6 and the second pole 7 are located at the radial center of the fixed body 4 as shown in FIG. 5A, the central convex portion 13 of the first pole 12 of the magnet body 10 is the second pole. 7 with a relative area of almost 100%. On the other hand, when the buffer magnet 6 and the second pole 7 are located at a predetermined position offset in the Y direction from the radial center of the fixed body 4 as shown in FIG. The central convex portion 13 of the pole 12 has a relative area of about half relative to the second pole 7 and is in a close positional relationship, and the portion corresponding to the remaining half of the relative area is further centered. The relationship is opposed to the peripheral portion of the first pole 12 that is further about 5 mm away from the convex portion 13.

  For example, in the case of FIG. 5A and FIG. 5B, the magnetic flux density on the surface of the central convex portion 13 of the first pole 12 of the magnet body 10 closest to the second pole 7 is about 0. 35 [T]. On the other hand, when the buffer magnet 6 and the second pole 7 illustrated in FIG. 5B are located at predetermined positions that are offset in the Y direction from the radial center of the fixed body 4, the buffer magnet 6 and the second pole 7 are located more than the central convex portion 13. Further, the magnetic flux density on the peripheral surface of the first pole 12 that is about 5 mm away is about 0.54 [T]. The repulsive force acting between the two magnets is proportional to the product of the relative area where the magnets confront each other and the magnetic flux density on the surface of each magnet, and inversely proportional to the square of the distance between the two magnets.

  Therefore, the repulsive force acting between the magnet body 10 and the buffer magnet 6 is about 0.86 times greater in the case of FIG. 5B than in the case of FIG. The reduction rate is also about 0.93 times. This is because, as a result of the first pole 12 having the central convex portion 13, the repulsive force is reduced when the peripheral portion of the first pole 12 that is far from the second pole 7 faces each other. Therefore, for example, when the resonance frequency of the magnet body 10 of the vibration power generator 1 is about 100 Hz, the resonance frequency can be set to about 93 Hz after the vibration power generator 1 is manufactured. In the case of the present embodiment, the outer diameters of the buffer magnet 6 and the second pole 7 included in the fixed bodies 4a and 4b are smaller than the outer diameter of the first pole 12 of the magnet body 11, and the first pole 12 Since it has a relationship having substantially the same area as the central convex portion 13, when the buffer magnet 6 and the second pole 7 are positioned at a predetermined position deviated from the radial center in the Y direction, the central convex portion of the first pole 12 is provided. The change in the relative area where the part 13 and the second pole 7 face each other can be increased.

  That is, in the present embodiment, the first pole 12 has the central convex portion 13 that is thicker than the peripheral portion and is closer to the second pole 7 of the fixed body 4 than the peripheral portion. By adjusting the relative area in which the central convex portion 13 approaches the second pole 7, the range in which the buffer magnet 6 and the second pole 7 can be displaced is small in the radial direction (Y direction) resonance frequency adjusting mechanism 5. However, the elastic force determined by the repulsive force can be adjusted. Since the resonance frequency of the magnet body 10 of the vibration generator 1 can be adjusted within a predetermined range after the vibration generator 1 is manufactured, the resonance frequency of the magnet body 10 that vibrates in the vibration generator 1 and the vibration generator 1 can be adjusted. The vibration frequency of the reciprocating motion that excites vibration is substantially matched, the speed of the reciprocating motion of the magnet body 10 is maximized, and a large current and a large voltage can be taken out, so that the power generation efficiency can be improved.

  In the vibration power generator 1, the coil 2a and the coil 2b constituting the coil 2 may be connected in parallel, and a plurality of coils may be further added. In the coil 2, the winding direction of a plurality of coils, or the polarity of series connection and / or parallel connection can be reversed according to the direction of the magnetic flux from the magnet body. By providing a plurality of coils at a position where the magnetic flux of the magnet body is effectively interlinked, that is, a position where the magnetic flux density is high, the output voltage at the coil can be further increased. The coils 2 may be connected with the same polarity so that the coil electromotive force generated in the coils 2a and 2b is output to the output terminal 21 without canceling each other.

  FIG. 6 is a diagram illustrating a vibration generator 1a according to another preferred embodiment of the present invention. Specifically, FIG. 6 is a cross-sectional view along the center axis in the vertical direction shown in the figure. In the vibration power generator 1a, the resonance frequency adjusting mechanisms 5c and 5d having different configurations from those of the previous embodiment are respectively provided on the lower side. The fixed body 4a and the upper fixed body 4b are provided. The magnet body 10c includes first poles 12c and 12d having a different configuration from the previous embodiment, and moves and vibrates in the direction of the central axis of the housing 3. The vibration generator 1a of the present embodiment is substantially the same as the vibration generator 1 of the previous embodiment, except that the configuration of the magnet body 10c and the configurations of the resonance frequency adjusting mechanisms 5c and 5d are slightly different. Therefore, the same parts as those in the previous embodiment are denoted by the same reference numerals and the description thereof is omitted.

  The magnet body 10c of the present embodiment includes a columnar rare earth magnet 11 and two poles 12c and 12d connected to both end faces of the magnet 11, respectively. These poles 12a and 12b have different cross-sectional shapes from those of the previous embodiment, and are substantially equal to the diameter of the magnet body 10 and define the respective outer diameters, and the thickness of the peripheral part (about 5 mm). A central convex portion 13c or 13d having a large thickness (about 10 mm) and formed in a convex shape, and a tapered surface formed by cutting a part of a cone from the peripheral portion to the central convex portion 13 is formed. . In the case of the present embodiment, the diameter of the central protrusion 13c or 13d of the first poles 12c and 12d is about 10 mm.

  The resonance frequency adjusting mechanisms 5c and 5d include buffer magnets 6a and 6b that apply a repulsive force to the magnet body 10, and second poles 7c and 7d that are connected to the magnet body 10 so as to be accessible. And having. The second poles 7c and 7d have a different cross-sectional shape from that of the previous embodiment, and are configured such that a plane inclined toward the side closer to the first poles 12 and 12b of the magnet body 10 is formed. As a result, the second poles 7c and 7d are not symmetrical with respect to the central axis such as a cylinder, and as shown in FIG. 6, when the central pole rotates, the position of the tip rotates circumferentially. It is like that. In the case of the present embodiment, the outer diameters of the buffer magnet 6b and the second poles 7c and 7d included in the fixed bodies 4a and 4b are smaller than the outer diameter of the first pole 12 of the magnet body 11.

  Therefore, the resonance frequency adjusting mechanisms 5c and 5d in the present embodiment can adjust the resonance frequency of the magnet body 10c of the vibration power generator 1a. For example, the second poles 7c and 7d connected to the buffer magnets 6a and 6b of the resonance frequency adjusting mechanisms 5c and 5d are not only movable in the Y direction by the slide groove 8 provided in the fixed body 4, but also engaged. The portion 9 can be rotated in the axial direction, and can be moved and rotated in a predetermined position and direction to engage and stop. In other words, the resonance frequency adjusting mechanisms 5c and 5d move the buffer magnet 6a and the second pole 7c, or the buffer magnet 6b and the second pole 7d not only in the radial direction but also in the circumferential direction and fix them at an arbitrary position. Since the relative positions of the first poles 12c and 12d of the magnet body 10 and the second poles 7c and 7d of the fixed body can be finely adjusted, fine adjustment of the resonance frequency is facilitated.

  Note that the slide groove 8 provided in the fixed body 4 can move the buffer magnet 6a and the second pole 7c, or the buffer magnet 6b and the second pole 7d in the Y direction which is the radial direction. It may be movable in the circumferential direction. Of course, the shape of the second poles 7c and 7d is not limited to the above-described embodiment, and may be any shape that greatly changes the relative area where the central convex portion 13 of the first pole approaches the second pole 7. Since the resonance frequency of the magnet body 10c of the vibration generator 1c can be adjusted within a predetermined range after the vibration generator 1c is manufactured, the resonance frequency of the vibrating magnet body 10c and the vibration generator 1c are excited. The power generation efficiency can be improved by substantially matching the vibration frequency of the reciprocating motion.

  In the vibration generator 1c, the two poles 12c and 12d of the magnet body 10c have a tapered surface obtained by cutting a part of a cone from the peripheral portion to the central convex portion 13. It may be formed in a staircase shape by a circumferential plane. If the central convex portion 13 of the first pole 12 of the magnet body 10 is at the axially symmetric center position of the magnet body 10, the resonance frequency varies even if the vibrating magnet body 10 rotates around the axis. It is because it does not change. The first pole 12 of the magnet body 10 has a peripheral part that defines the outer diameter of the first pole 12, and a center that is thicker than the peripheral part and is closer to the second pole 7 of the fixed body 4 than the peripheral part. What is necessary is just to have the convex part 13. FIG.

  In the case of the present embodiment, the outer diameters of the buffer magnet 6b and the second poles 7c and 7d included in the fixed bodies 4a and 4b are smaller than the outer diameter of the first pole 12 of the magnet body 11. The outer diameters of the buffer magnet 6b and the second poles 7c and 7d may be as large as the outer diameter of the first pole 12 of the magnet body 11. When the second poles 7c and 7d are configured to form a plane inclined toward the side closer to the first poles 12 and 12b of the magnet body 10 as in the present embodiment, the buffer magnet 6b This is because if the second pole 7c or 7d is rotated, the relative area where the central convex portion 13 of the first pole 12 and the second pole 7 face each other can be changed. Accordingly, since the resonance frequency of the magnet body 10c of the vibration generator 1c can be adjusted within a predetermined range after the vibration generator 1c is manufactured, the resonance frequency of the vibrating magnet body 10c and the vibration generator 1c are vibrated. The power generation efficiency can be improved by substantially matching the vibration frequency of the reciprocating motion to be excited.

  The vibration generator of the present invention can also be applied to a generator including a rectifier, a storage battery, a charging circuit, etc., a charging battery, and a charger. In addition, since the electronic device including the vibration generator of the present invention is excellent in portability, it is particularly suitable as a mobile device carried by a user or a generator attached to a vehicle that generates a lot of vibrations.

1, 1A, 1a Vibration generator 2, 2a, 2b Coil 3 Case 4a, 4b Fixed body 5a, 5b, 5c, 5d Resonance frequency adjusting mechanism 6a, 6b Buffer magnet 7a, 7b, 7c, 7d Second pole 8a, 8b Slide groove 9a, 9b Engagement part 10, 10c Magnet body 11 Magnet 12a, 12b, 12c, 12d 1st pole 13a, 13b, 13c, 13d Center convex part 21, 23 Output terminal 22 Rectifier

Claims (5)

The casing includes a coil, a cylindrical casing around which the coil is wound, a fixed body provided at each end of the casing, and a magnetized magnet. A magnet body installed so as to be capable of reciprocating along the inner surface of
The magnet body has two first poles respectively connected to both end faces of the magnet;
Each fixed body has a buffer magnet for applying a repulsive force to the magnet body on the inner surface side of the housing, and a second pole connected to the buffer magnet so as to be accessible to the magnet body And having
The first pole of the magnet body has a peripheral portion that defines the outer diameter of the first pole, and a thickness greater than the thickness of the peripheral portion, and is closer to the second pole of the fixed body than the peripheral portion. A central convex portion to approach,
Vibration generator. The outer diameter of the buffer magnet and the second pole of the fixed body is smaller than the outer diameter of the first pole of the magnet body,
The vibration generator according to claim 1. The buffer magnet and the second pole are fixed at positions deviated from the radial center of the fixed body,
The vibration generator according to claim 1 or 2. The fixed body includes a displacement mechanism that moves the buffer magnet and the second pole in a radial direction or a circumferential direction to fix the fixed magnet at an arbitrary position.
The vibration generator according to any one of claims 1 to 3. A plurality of the coils are provided in the housing, and the plurality of coils are connected in series and / or in parallel.
The vibration generator according to any one of claims 1 to 4.