JP2011166893A - Oscillating generator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an oscillating generator which is excellent in power conversion efficiency though its case is small in size, and can boost an output voltage, related to an oscillating generator which converts motion energy based on vibration including reciprocation movement into electric power. <P>SOLUTION: The oscillating generator includes two or more coils, the cylindrical case to which the respective coils are wound, two fixed bodies arranged at both ends of the case, and a magnet body which includes magnetized magnets and is arranged so as to be reciprocative between the fixed bodies along the internal face of the case. The magnet body has two poles connected to both end faces of the magnets, and two sub-magnets connected to the poles. The fixed bodies have buffering magnets which are connected to the side of the internal face of the case so as to be approachable to the magnet body, and cause repulsive forces between the sub-magnets of the magnet body. The coils are wound to the case in accordance with ranges where the poles of the magnet body reciprocate. <P>COPYRIGHT: (C)2011,JPO&INPIT

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).

  A hollow first pipe formed of a non-magnetic material and closed at both ends; a power generating coil wound around the first pipe and provided with at least one solenoid coil; A movable magnet disposed inside the first pipe and movable along a winding axis direction of the power generation coil, the movable magnet being formed of a nonmagnetic material and closed at both ends. A second pipe and a plurality of magnets sealed inside the second pipe, wherein the movable magnets are disposed at both ends of the second pipe, There is a vibration type electromagnetic generator including a magnet end member that protects a magnet (Patent Document 2).

  In a linear actuator having the same configuration as that of a vibration generator, a mover magnet supported by a predetermined means is disposed opposite to a yoke including at least three magnetic pole pieces together with a parallel coil, and the mover magnet is mounted on the yoke. , A linear actuator configured to reciprocate between the magnetic pole pieces by applying magnetic thrust to the poles by exciting the magnetic pole pieces to the same polarity or different polarities, Ferromagnetic pieces are provided to form magnetic paths so that the magnetic field lines of the mover magnets are directed toward the at least two magnetic pole pieces, respectively, and each tip of the ferromagnetic piece is thrust in the moving direction at the stop position. There is one characterized in that it is configured to be slightly shifted in the moving direction from the center position of the magnetic pole piece (Patent Document 3).

JP 2002-374661 A (FIGS. 1 to 5) JP 2009-118581 A (FIGS. 1 to 9) Japanese Patent Laying-Open No. 2005-245047 (FIGS. 1 to 3)

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

  The vibration generator of the present invention includes two or more coils, a cylindrical casing around which the coils are wound, two fixed bodies respectively provided at both ends of the casing, and a magnetized magnet. A magnet body installed so as to be able to reciprocate along the inner surface of the housing between each fixed body, and two magnet poles respectively connected to both end faces of the magnet, and each pole Two submagnets to be coupled, and each of the fixed bodies is connected to the magnet body so as to be accessible on the inner surface side of the casing, and a buffer for applying a repulsive force between the submagnets of the magnet body Each of the coils has a magnet and is wound around the casing in correspondence with a range in which each pole of the magnet body reciprocates.

  Preferably, in the vibration power generator according to the present invention, the magnetic properties on the end face side connected to the pole of the secondary magnet of the magnet body coincide with the magnetic properties on the end face side of the magnet connected with the pole interposed therebetween.

  The vibration generator according to the present invention includes three or more coils, a cylindrical casing around which the coils are wound, two fixed bodies provided at both ends of the casing, and magnetized 2 A magnet body including two or more magnets and reciprocally moved along the inner surface of the housing between each fixed body, and the magnet body is coupled to one end face of the two magnets One or more central poles, two poles respectively connected to the other end face of the magnet, and two secondary magnets respectively connected to the poles, each fixed body being on the inner surface side of the housing , Having a buffer magnet that is connected to the magnet body so as to be accessible, and that exerts a repulsive force between the secondary magnets of the magnet body, and each coil is within the center pole of the magnet body or the range in which each pole reciprocates Correspondingly, it is wound around each case.

  Preferably, in the vibration power generator according to the present invention, the magnetic properties on the end surface side connected to the pole of the secondary magnet of the magnet body coincide with the magnetic properties on the end surface side of the magnet connected with the pole interposed therebetween.

  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, two fixed bodies provided at both ends of the casing, and magnetized magnets. And a magnet body installed so as to be capable of reciprocating along the inner surface of the housing. When two or more coils are wound around the housing, the moving magnet body has two poles that are respectively connected to both end faces of the magnet and two sub-magnets that are respectively connected to the poles. Further, when there are three or more coils wound around the housing, the magnet body is connected to one or more central poles connected to one end face of the two magnets and the other end face of the magnet, respectively. You may have two poles and two submagnets each connected with a pole.

  The coil wound around the housing may be a plurality of four or more. In this case, the moving magnet body includes a plurality of magnets according to the number of coils, a plurality of central poles, and both ends. And two submagnets that are respectively connected to the poles located at the top of each other. The number of coils may be increased corresponding to the number of magnetic poles formed by the magnets of the moving magnet body. Further, the housing and the fixed body may be formed integrally.

  Furthermore, in the vibration power generator according to the present invention, each fixed body includes a buffer magnet that is connected to the magnet body so as to be close to the inner surface side of the housing and exerts a repulsive force between the secondary magnet of the magnet body. Have. The buffer magnet prevents the magnet body from moving and colliding with the fixed bodies located at both ends of the casing, and being destroyed by impact. Moreover, since the moving magnet body is provided with the secondary magnet connected to the pole, the pole, which is the magnet body, is prevented from coming into close contact with the buffer magnet by repelling the buffer magnet. Further, in the vibration power generator, each coil is wound around the casing in correspondence with a range in which each pole of the magnet body reciprocates. Therefore, the vibration generator according to the present invention is provided corresponding to the range in which the magnetic permeability pole is reciprocated when the magnet body installed so as to be capable of reciprocating is moved. Coil electromotive force is generated.

  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 by the magnet body is effectively interlinked, that is, at a position where the magnetic flux density is high, the output voltage at the coil can be further increased. The vibration generator of the present invention can increase the power conversion efficiency even in a small casing, and can further increase the output voltage.

  In addition, in the vibration power generator of the present invention, if the magnetic properties on the end face side connected to the pole of the secondary magnet of the magnet body coincide with the magnetic properties on the end face side of the magnet connected with the pole interposed therebetween, More magnetic flux due to the repulsive magnetic field formed by the magnet and the sub-magnet passes through the high permeability poles provided at both ends of the magnet body. Therefore, since the magnetic flux density by the magnet body at the position of the coil is further increased, the output voltage at the coil can be further increased.

  Regarding a vibration generator that converts kinetic energy due to vibration involving reciprocation into electric power, the magnet body has two poles that are respectively connected to both end faces of the magnet, and two submagnets that are respectively connected to the poles, Each fixed body has a buffer magnet on the inner surface side of the housing, which is connected to the magnet body so as to be close to each other and exerts a repulsive force between the secondary magnets of the magnet body, and each coil has a magnet body Vibration that can increase the output voltage with excellent power conversion efficiency even in a small housing by making each of the poles wound around the housing corresponding to the range of reciprocal movement A generator 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 connection of the rectifier of 1 A of vibration generators by preferable embodiment of this invention. Example 1 It is a graph which shows the magnetic flux density distribution of the vibration generator 1 by preferable embodiment of this invention, and a comparative example. (Example 1, Comparative Example 1, Comparative Example 2) It is a figure explaining the vibration generator 101 of a comparative example. (Comparative Example 1) It is a figure explaining the vibration generator 102 of a comparative example. (Comparative Example 2) It is sectional drawing explaining other vibration generator 1B by preferable embodiment of this invention. (Example 2) It is sectional drawing explaining other vibration generator 1C by preferable embodiment of this invention. (Example 3)

  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. FIG. 2 is a diagram for explaining connection of the vibration generator 1 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 generator 1 includes a coil 2, a cylindrical housing 3 around which the coil 2 is wound, a fixed body 4 provided at each end of the housing 3, and a magnetized magnet 11. It is a vibration generator including a magnet body 10 that can be reciprocated between the fixed body 4 and the inner surface of the housing 3. 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 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 product having an inner diameter of about 24.6 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.

  Further, the fixed body 4 is a non-magnetic resin molded part, and fixed bodies 4 a and 4 b are fixed to both ends of the housing 3 with screws or an adhesive. Each of the fixed bodies 4a and 4b includes a buffer body that is connected to the magnet body 10 so as to be accessible at the center thereof. In the case of the present embodiment, the buffer body has a disk-shaped buffer magnet 5 that applies a repulsive force between the approaching magnet body 10 and the fixed body 4. The buffer magnet 5 that is a buffer body prevents the magnet body 10 from moving and colliding with the fixed bodies 4 located at both ends of the housing 3 violently and being destroyed by impact. For example, the buffer magnet 5 is a disk-shaped rare earth magnet having a diameter of about 11 mm and a thickness of about 1.2 mm. The buffer magnet 5 is attached to the central portion of the fixed body 4 with an adhesive. In the case of the present embodiment, as shown in FIG. 1, the buffer magnet 5a provided on the lower fixed body 4a and the buffer magnet 5b provided on the upper fixed body 4b are close to the vibrating magnet body 10. It is magnetized so that different magnetic poles (N pole and S pole) appear on the sides.

  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.

  Magnet body 10 further includes two poles 12a and 12b that are respectively connected to both end faces of magnet 11, and two submagnets 13a and 13b that are respectively connected to these poles 12a and 12b. The poles 12a and 12b are disk-shaped magnetic bodies. Specifically, each of the poles 12a and 12b is a soft iron member having an outer diameter of about 24 mm and a thickness of about 3 mm. The submagnets 13a and 13b are cylindrical rare earth magnets having an outer diameter of about φ4.8 mm and a thickness of about 1 mm. The buffer magnet 5a of one fixed body 4a is a disk-shaped rare earth magnet having a diameter of about 11 mm and a thickness of about 1.2 mm, and the buffer magnet 5b of the other fixed body 4b has a diameter of about 4 mm. A disc-shaped rare earth magnet having a thickness of about 1.0 mm and a thickness of about 8 mm. Since the moving magnet body 10 includes the secondary magnets 13a and 13b connected to the pole, the magnetic poles 12a and 12b are in close contact with the buffer magnet 5a or 5b by repelling the buffer magnet 5a or 5b. Can be prevented.

  As shown in FIG. 1, the secondary magnets 13a and 13b included in the magnet body 10 vibrate against the buffer magnet 5a provided on the lower fixed body 4a and the buffer magnet 5b provided on the upper fixed body 4b. The magnet body 10 is magnetized and attached so that different magnetic poles (N pole and S pole) appear on the side close to the magnet body 10. In the case of the present embodiment, the magnet 11 included in the magnet body 10 and the sub magnets 13a and 13b are arranged such that different magnetic poles sandwich the poles 12a and 12b, respectively.

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

  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). ).

  In the vibration power generator 1, the coils 2 a and 2 b are wound around the housing 3 corresponding to the range in which the poles 12 a and 12 b of the magnet body 10 reciprocate. Therefore, the vibration generator 1 is provided corresponding to the range in which the poles 12a and 12b having a high magnetic permeability reciprocate when the magnet body 10 installed so as to reciprocate is moved. A higher coil electromotive force is generated by electromagnetic induction in 2b.

  FIG. 3 shows the magnetic field generated by the magnet body 10 positioned at the center point (Z = 0 mm) of the housing 3 in the case of the vibration generator 1 of the present embodiment and the vibration generator 101 or 102 of the comparative example. 4 is a graph showing an effective magnetic flux density distribution at a distance (radius of about 15 mm) at which the coil 2 is arranged from the central axis. The horizontal axis is the distance from the center point of the housing 3 along the central axis, and the vertical axis is the magnetic flux density, and the direction of the magnetic flux in one direction orthogonal to the coil 2 is positive, and vice versa. The direction of the magnetic flux heading is negative.

  In the vibration generator 1 of the present embodiment, the absolute value of the effective magnetic flux density of the magnetic field generated by the magnet body 10 is large enough to reach about 0.35 [T] at a position of about ± 12 mm. In the vibration power generator 1, the coils 2 a and 2 b are wound around the housing 3 corresponding to the range in which the poles 12 a and 12 b of the magnet body 10 reciprocate. When the magnet body 10 vibrates, a magnetic field having an effective magnetic flux density having a large peak is linked to the coils 2a and 2b. Therefore, the vibration generator 1 is provided corresponding to the range in which the poles 12a and 12b having a high magnetic permeability reciprocate when the magnet body 10 installed so as to reciprocate is moved. A higher coil electromotive force is generated by electromagnetic induction in 2b.

  FIG. 4 is a diagram illustrating a vibration generator 101 of a comparative example. FIG. 5 is a diagram illustrating a vibration generator 102 of a comparative example. Specifically, FIGS. 4 and 5 are cross-sectional views along the center axis in the vertical direction shown in the figure, and the vibration generators 101 to 102 of these comparative examples have different vibrations from the previous examples. The child magnet body 110 or the magnet body 120 moves in the direction of the central axis and vibrates. The vibration generators 101 to 102 of the present embodiment are substantially the same as the vibration generator 1 of the previous embodiment except that the configuration of the magnet body 110 or 120 is 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 110 of the vibration power generator 101 of the comparative example is composed only of a cylindrical rare earth magnet 111 having an outer diameter of about 24 mm and a length of about 20 mm. That is, the size of the magnet 111 of the vibration power generator 101 is the same as that of the magnet 11 in the previous embodiment, and the magnet body 110 of the comparative example is different from the magnet body 10 in the previous embodiment to the poles 12a and 12b. The magnets 13a and 13b are excluded. Therefore, the magnetic energy of the magnet body 110 is substantially the same as that of the magnet body 10 in the previous embodiment.

  The magnet body 120 of the vibration power generator 102 of the comparative example is composed only of a cylindrical rare earth magnet 121 having an outer diameter of about 24 mm and a length of about 28 mm. That is, the size of the magnet 121 of the vibration power generator 102 is substantially the same as the magnet body 10 including the pole 12 and the submagnet 13 in the previous embodiment, and the magnet body 120 of the comparative example is a magnet in the previous embodiment. This is a magnet having a size approximately equal to the size of the state in which the poles 12a and 12b and the submagnets 13a and 13b are connected to the body 10. Therefore, the magnetic energy of the magnet body 120 is larger than that of the magnet body 10 in the previous embodiment.

  In the vibration power generator 101 of the comparative example, the absolute value of the effective magnetic flux density of the magnetic field generated by the magnet body 110 is about 0.28 [T] at a position of about ± 10 mm. The peak value is smaller than that of the machine 1. Further, in the vibration power generator 102 of the comparative example, the absolute value of the effective magnetic flux density of the magnetic field generated by the magnet body 120 is a little over about 0.30 [T] at a position of about ± 13 mm. The peak value is smaller than that of the vibration generator 1. That is, the magnetic energy of the magnet body 10 in the example is almost the same as that of the magnet body 110 of the comparative example, and the absolute value of the effective magnetic flux density is the largest even though it is smaller than the magnet body 120 of the comparative example. . Therefore, in the vibration generator 101 or 102 of the comparative example, if each magnet body vibrates at the same vibration speed, the high permeability poles 12a and 12b are not provided corresponding to the reciprocating range. The coil electromotive force generated by electromagnetic induction in each of the coils 2a and 2b is lower than that of the vibration power generator 1 of this embodiment.

  When the magnet body 10 of the vibration power generator 1 of the present embodiment vibrates sinusoidally, the output waveform of the rectifier 22 to which the coil electromotive force is input indicates that the magnet body 10 moves near the center of the housing 3. However, the magnet body 10 reaches the fixed body 4a or 4b on the end side of the housing 3 and is turned back every half cycle. That is, the vibration power generator 1A including the vibration power generator 1 can increase the power conversion efficiency even if it is a small casing as compared with the case of the vibration power generator 101 or 102 of the comparative example, and has a high output voltage. Can be obtained.

  FIG. 6 is a diagram illustrating a vibration generator 1B 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, and in the vibration power generator 1B, the magnet body 10B, which is a vibrator having a different configuration from the previous embodiment, has the center axis It moves in the direction of and vibrates. In the vibration power generator 1B of the present embodiment, the magnetization direction of the submagnets 14a and 14b and the magnetization direction of the buffer magnets 6a and 6b included in the fixed bodies 4a and 4b are different from each other in the configuration of the magnet body 10B. Others are almost the same as the vibration generator 1 of the previous embodiment. 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 10B of the present embodiment includes a columnar rare earth magnet 11 having an outer diameter of about 24 mm and a length of about 20 mm, two poles 12a and 12b connected to both end faces of the magnet 11, respectively, Two submagnets 14a and 14b connected to the poles 12a and 12b, respectively. The secondary magnets 14a and 14b are cylindrical rare earth magnets having the same size as the previous secondary magnets 13a and 13b, and are magnets having opposite magnetization directions. Further, the buffer magnets 6a and 6b included in the fixed bodies 4a and 4b are disc-shaped rare earth magnets having the same size as the previous buffer magnets 5a and 5b, respectively, and are magnets having opposite magnetization directions. .

  As shown in FIG. 4, the secondary magnets 14a and 14b included in the magnet body 10B vibrate against the buffer magnet 6a provided on the lower fixed body 4a and the buffer magnet 6b provided on the upper fixed body 4b. The magnet body 10B is magnetized and attached such that different magnetic poles (N pole, S pole) appear on the side close to the magnet body 10B. Furthermore, in the case of the present embodiment, the magnet 11 included in the magnet body 10B and the sub magnets 14a and 14b are arranged so that the same magnetic poles sandwich the poles 12a and 12b, respectively. In other words, the magnetic properties on the end surface side of the magnet body 10B connected to the poles 12a and 12b of the submagnets 14a and 14b are made to coincide with the magnetic properties on the end surface side of the magnet 11 connected with the poles 12a and 12b interposed therebetween. ing.

  In the vibration power generator 1B, the respective coils 2a and 2b are wound around the housing 3 corresponding to the range in which the respective poles 12a and 12b of the magnet body 10B reciprocate. Therefore, the vibration power generator 1B is provided corresponding to the range in which the high permeability poles 12a and 12b reciprocate when the magnet body 10B installed so as to reciprocate is moved. A higher coil electromotive force is generated by electromagnetic induction in 2b.

  That is, in the vibration power generator 1B, the magnet body 10B is configured such that the magnetization directions of the magnet 11 and the submagnets 14a to 14b are adjusted so that repulsive magnetic fields are generated in the poles 12a and 12b at both ends. More magnetic flux due to the repulsive magnetic field formed by the magnet 11 and the submagnets 14a and 14b passes through the high permeability poles 12a and 12b provided at both ends of the magnet body 10B. Therefore, since the magnetic flux density by the magnet body 10B at the positions of the coils 2a and 2b is further increased, the output voltage at the coil 2 can be further increased.

  FIG. 7 is a diagram illustrating a vibration generator 1C according to another preferred embodiment of the present invention. Specifically, FIG. 7 is a cross-sectional view along the center axis in the vertical direction shown in the figure, and the vibration generator 1C has two coils from the coil 2 of the vibration generator 1 of the previous embodiment. The difference is that the magnet body 10C has a different configuration, and the other configuration is substantially the same as that of the vibration generator 1 of the previous embodiment. Therefore, the same parts as those in the previous embodiment are denoted by the same reference numerals and the description thereof is omitted.

  The vibration generator 1C includes three coils 2 (2a, 2b, and 2c), a cylindrical housing 3 around which the coil 2 is wound, a fixed body 4 that is provided at each end of the housing 3, and magnetization. The vibration generator includes a magnet body 10 </ b> C that is installed so as to reciprocate along the inner surface of the housing 3 between the fixed body 4 and the magnet 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 88 mm and a minor axis diameter of about 34 mm.

  The magnet body 10C, which is a vibrator of the vibration generator 1C, includes two magnetized magnets 11a and 11b, and can reciprocate between the fixed bodies 4a and 4b along the inner surface of the housing 3. It is a magnet body to be installed. The magnet body 10C includes a central pole 15 connected to one end face of the two magnets 11a and 11b, two poles 12a and 12b connected to the other end faces of the magnets 11a and 11b, and poles 12a and 12b, respectively. There are two submagnets 13a and 13b that are connected to each other.

  As in the previous embodiment, the respective fixed bodies 4a and 4b are connected to the inner surface of the housing 3 so as to be accessible to the magnet body 10C and repel between the auxiliary magnet 13a or 13b of the magnet body 10C. It has buffer magnets 5a and 5b for applying a force, respectively. The coils 2a, 2b, and 2c are wound around the housing 3 in accordance with the range in which the poles 12a and 12b of the magnet body 10C and the central pole 15 reciprocate, respectively.

  Since the coil 2a, the coil 2b, and the coil 2c are connected in series in opposite directions as in the previous embodiment, the absolute value of the relative speed due to vibration between the magnet body 10 and the coil 2 is the magnet body. 10C increases when it moves near the center of the housing 3, while it decreases 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 </ b> C 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) ).

  In the vibration power generator 1C, the coils 2a, 2b, and 2c are wound around the housing 3 corresponding to the range in which the poles 12a and 12b and the center pole 15 of the magnet body 10C reciprocate, respectively. Therefore, the vibration power generator 1C is provided corresponding to the range in which the poles 12a and 12b having high permeability and the central pole 15 reciprocate when the magnet body 10 installed so as to reciprocate moves. A higher coil electromotive force can be generated in each coil 2a, 2b and 2c by electromagnetic induction.

  The submagnets 13a and 13b provided in the magnet body 10C are the same as the submagnets 14a and 14b of the previous embodiment, the buffer magnet 6a provided in the lower fixed body 4a and the buffer magnet provided in the upper fixed body 4b. 6b may be magnetized and attached such that different magnetic poles (N pole, S pole) appear on the side close to the vibrating magnet body 10C. Furthermore, the magnet 11 provided in the magnet body 10C and the submagnets 13a and 13b may be arranged such that the same magnetic poles sandwich the poles 12a and 12b, respectively. That is, the magnetic properties on the end face side of the magnet body 10C connected to the poles 12a and 12b of the submagnets 13a and 13b are made to coincide with the magnetic properties on the end face side of the magnet 11 connected with the poles 12a and 12b interposed therebetween. May be.

  That is, in the vibration power generator 1C, the magnet body 10C may be configured such that the magnetization directions of the magnet 11 and the submagnets 13a to 13b are adjusted so that repulsive magnetic fields are generated in the poles 12a and 12b at both ends. More magnetic flux due to the repulsive magnetic field formed by the magnets 11a and 11b and the submagnets 13a and 13b passes through the poles 12a and 12b having high permeability provided at both ends of the magnet body 10C. The central pole 15 sandwiched between the two magnets 11a and 11b is similarly configured to generate a repulsive magnetic field. Therefore, since the magnetic flux density by the magnet body 10C at the positions of the coils 2a, 2b, and 2c is further increased, the output voltage at the coil 2 can be further increased.

  In the vibration power generator 1C, the coils 2a, 2b, and 2c constituting the coil 2 may be connected in parallel, or a plurality of coils may be 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, at a position where the magnetic flux density is high, the output voltage at the coil can be further increased. The coil 2 may be connected with the same polarity so that the coil electromotive force generated in the coils 2a, 2b, and 2c is output to the output terminal 21 without canceling each other.

  Further, the vibration power generator 1C includes a magnet body 10C that approaches and a fixed body 4a and 4b (or a buffer magnet 5a or 5b) when the magnet body 10 that is a vibrator moves and vibrates in the direction of the central axis. You may further have an elastic member which makes an elastic force act between each. The elastic member may be a nonmagnetic metal spring, an elastic resin, or a foam material containing bubbles. Both ends of the elastic member are fixed to the magnet body 10 </ b> C that is a vibrator and the fixed body 4. The elastic member prevents the magnet body 10C from moving and colliding with the fixed bodies 4 located at both ends of the casing vigorously and being destroyed by impact. Further, since the auxiliary magnets 13a or 13b connected to the poles 12a and 12b of the moving magnet body 10C are provided, the magnetic poles 12a and 12b are prevented from coming into close contact with the buffer magnet 5a or 5b. Can do.

  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, 1B, 1C, 1D Vibration generator 2 Coil 3 Housing 4 Fixed body 5, 6 Buffer magnet 10, 10B, 10C Magnet body 11 Magnet 12 Pole 13, 14 Sub magnet 21, 23 Output terminal 22 Rectifier

Claims (4)

Each of the fixed bodies including two or more coils, a cylindrical casing around which each of the coils is wound, two fixed bodies respectively provided at both ends 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,
The magnet body has two poles respectively connected to both end faces of the magnet, and two sub magnets respectively connected to the poles;
Each of the fixed bodies has a buffer magnet on the inner surface side of the housing, which is connected to the magnet body so as to be close to the counter magnet and exerts a repulsive force between the sub magnet and the magnet body,
Each of the coils is wound around the housing corresponding to the range in which each pole of the magnet body reciprocates.
Vibration generator. The magnetic property of the end surface side connected to the pole of the sub-magnet of the magnet body matches the magnetic property of the end surface side of the magnet connected with the pole in between.
The vibration generator according to claim 1. Each including three or more coils, a cylindrical casing around which the coils are wound, two fixed bodies respectively provided at both ends of the casing, and two or more magnetized magnets. A magnet body installed so as to be capable of reciprocating between the fixed body and the inner surface of the housing,
One or more central poles connected to one end face of two magnets; two poles connected to the other end face of the magnet; and two submagnets connected to the poles; Have
Each of the fixed bodies has a buffer magnet on the inner surface side of the housing, which is connected to the magnet body so as to be close to the counter magnet and exerts a repulsive force between the sub magnet and the magnet body,
Each of the coils is wound around the housing corresponding to a range in which the central pole of the magnet body or each of the poles reciprocates,
Vibration generator. The magnetic property of the end surface side connected to the pole of the sub-magnet of the magnet body matches the magnetic property of the end surface side of the magnet connected with the pole in between.
The vibration generator according to claim 3.

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