JP2009296734A - Oscillating generator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an oscillating generator obtaining large power by improving a magnetic circuit structure of the oscillating generator and having an oscillating direction conversion mechanism for rotating an oscillating direction by 90 degrees. <P>SOLUTION: In the oscillating generator, R-Fe<SB>2</SB>based supermagnetostrictive alloy element in which a mole ratio of one type or two or above types in Tb, Dy, Sm, Ho and Er of a lanthanide based rare earth element (R), and Fe is 1:2 and which includes Laves crystal structure is surrounded by a copper wire coil, oscillation is transmitted to the element and power is generated. (a1) Ferromagnetic magnets giving magnetic bias are arranged at both ends of the supermagnetostrictive alloy element, auxiliary yokes of a magnetic body performing a magnetization amplification operation are installed on external sides of the ferromagnetic magnets on both ends and a closed magnetic circuit is constituted. (b) Oscillation reception means are connected to the auxiliary yokes. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a vibration generator that converts various mechanical vibrations that are abandoned in large quantities during economic activities into practical power.

One of the lanthanide rare earth elements (R), Tb, Dy, Sm, Ho, and Er, and a molar ratio of Fe to 1: 2 and an R—Fe ₂ system having a Laves crystal structure When mechanical stress is applied to the element made of the giant magnetostrictive alloy, electrons are generated between 4f orbital electrons between rare earth elements, between 3f orbital electrons between Fe elements, and between 4f-3d orbital electrons between rare earth elements and Fe. The magnetic moment is expressed by the combination of orbital angular momentum and spin angular momentum.

  This magnetic moment changes depending on the magnitude of the mechanical stress from the outside to the element, and as a result, the permeability μ of the giant magnetostrictive alloy element changes. Therefore, if a copper wire is wound around the outer circumference of the giant magnetostrictive alloy element, an electromotive force is generated between both ends of the copper wire, and if both ends of the copper wire are connected to form a closed circuit, the electromotive force is generated. Electric current is generated. This physical phenomenon is known as the inverse magnetostrictive effect or the Villari effect.

  Although power can be generated using this inverse magnetostriction effect, in the past research report examples, only extremely weak power is obtained. For this reason, power generation using the inverse magnetostriction effect (hereinafter sometimes referred to as “inverse magnetostrictive power generation”) is not practical even though it has attracted attention as a new power generation method different from solar power generation and wind power generation. It was concluded that the technology.

  In addition, the search for the mechanical vibration source necessary for performing inverse magnetostrictive power generation was insufficient, and practical application was made by charging the capacitor with weak power obtained by intermittent vibration, and not much power. However, the inverse magnetostrictive power generation has been lacking in practical value.

  Patent Document 1 discloses a generator including a giant magnetostrictive element in which a coil disposed under a rail is wound and storage means for storing an induced electromotive force generated in the coil. Since the induced electromotive force generated is small and it must be installed directly under the rail, it is not realistic.

  In the end, inverse magnetostrictive power generation is a unique power generation method in principle, but has not been attempted yet practically as seen in competitive technologies such as solar power generation and wind power generation.

Japanese Patent Laid-Open No. 10-271858

  Conventionally, it is the established theory that large power cannot be obtained by inverse magnetostrictive power generation. An object of the present invention is to improve the magnetic circuit structure of an inverse magnetostrictive vibration power generator and to obtain a large electric power so as to overturn this established theory.

  Furthermore, the present invention effectively uses mechanical vibration perpendicular to the ground surface that is continuously generated when, for example, a train or a car passes as an energy source for inverse magnetostrictive power generation, that is, a mechanical vibration source. An object of the present invention is to provide a vibration generator including a vibration direction conversion mechanism (hereinafter also referred to as a vibration deflector) that rotates the vibration direction by 90 degrees.

  These issues include the development of low-vibration vibration generators that can be installed without hindering train operation. For example, several thousand units can be distributed on the sleepers of the Yamanote Line and subway lines. It is assumed that when the train passes, mechanical vibrations transmitted to the sleepers on the track are converted into electric power.

  First, the inventor has intensively studied a method for increasing the power generation capacity to a practical level in the inverse magnetostrictive power generation mechanism.

As a result, first, (i) an alloy of Fe and one or more of rare earth elements (hereinafter referred to as R) such as Tb, Dy, Sm, Ho and Er, and the molar ratio of R and Fe is 1. : 2 and an R—Fe ₂ giant magnetostrictive alloy element having a Laves crystal structure is used, and (ii) a neodymium rare earth magnet that applies a magnetic bias between and at both ends of the giant magnetostrictive alloy element (hereinafter, , Neodymium magnets) are arranged to increase the ease of changing the magnetic moment, and (iii) the entire magnetic circuit with the core as a closed magnetic circuit structure with a yoke member makes the power generation capacity practical. I found that I can raise it to a certain level.

  Next, the present inventor has intensively studied a method for putting an inverse magnetostrictive power generation mechanism into practical use. As a result, for example, if a deflector mechanism that rotates and transmits the mechanical vibration in the vertical direction transmitted to the sleepers when passing through the train by 90 degrees is transmitted, the continuously generated large mechanical vibration can be used. We found that the power generation mechanism could be put to practical use.

  This invention was made | formed based on the said knowledge, The summary is as follows.

(1) One or more of Tb, Dy, Sm, Ho, and Er of the lanthanide rare earth element (R) and the molar ratio of Fe to 1: 2 and R-Fe having a Laves crystal structure _In a vibration generator that surrounds a ₂ system giant magnetostrictive alloy element with a copper wire coil and transmits vibration to the element to generate electricity,
(A1) A ferromagnetic magnet for applying a magnetic bias is disposed at both ends of the giant magnetostrictive alloy element, and a magnetic auxiliary yoke for amplifying the magnetization is disposed outside the ferromagnetic magnets at both ends. A closed magnetic circuit, and
(B) A vibration generator in which vibration receiving means is connected to the auxiliary yoke.

(2) One or more of Tb, Dy, Sm, Ho, and Er of the lanthanide rare earth element (R) and the molar ratio of Fe to 1: 2 and R-Fe having a Laves crystal structure _In a vibration generator that surrounds a ₂ system giant magnetostrictive alloy element with a copper wire coil and transmits vibration to the element to generate electricity,
(A2) A ferromagnetic magnet for applying a magnetic bias is disposed between and at both ends of the giant magnetostrictive alloy element, and a magnetic auxiliary yoke that has a magnetization amplification action outside the ferromagnetic magnets at both ends. To form a closed magnetic circuit, and
(B) A vibration generator in which vibration receiving means is connected to the auxiliary yoke.

  (3) The vibration generator according to (1) or (2), wherein the ferromagnetic magnet is a neodymium rare earth magnet.

  (4) The vibration generator according to any one of (1) to (3), wherein the magnetic body is electromagnetic pure iron, Fe-Ni high permeability alloy, or soft ferrite. .

(5) The length of the auxiliary yoke is 5% or more and less than 100% of the total length of the R—Fe ₂ -based giant magnetostrictive alloy element, according to any one of (1) to (4), Vibration generator.

  (6) The vibration according to any one of (1) to (5), wherein the vibration generator includes a vibration direction conversion mechanism that rotates mechanical vibration 90 degrees and transmits the mechanical vibration to the vibration receiving means. Generator.

  (7) The vibration generator according to (6), wherein the vibration generator has a height of 150 mm or less and can be installed horizontally.

The vibration power generator of the present invention using four giant magnetostrictive alloy elements of 10 mmφ × 25 mm length has a volume of 7.85 cm ³ and a weight of 72.6 g. 2W, effective power output 4.6W has been achieved.

Assuming that there is a large mechanical vibration source, the electric power generated by the vibration generator is proportional to the volume of the giant magnetostrictive element to be mounted. Therefore, if the volume of the giant magnetostrictive element is increased, the power generation output increases. For example, if a 62 mmφ × 120 mm long giant magnetostrictive element is installed per generator, an effective power output of 210 W is possible with an element volume of about 360 cm ³ and an element weight of about 3.3 kg. Become.

  Therefore, if it becomes possible to manufacture an ultra-small vibration generator that can be easily installed in a large mechanical vibration source at a low cost, it is possible to disperse several hundred to several thousand units in a vibration source. It is possible to compete with competing power generation methods in terms of power generation output.

  A vibration generator group in which a large number of ultra-small vibration generators are distributed and installed can continuously generate power as a whole. One of the reasons for this is that the giant magnetostrictive element has a high-speed response in the order of several tens of microseconds, and instantaneous power generation starts without applying a mechanical inertia load to the vibration generator without a rotating mechanism. In addition, instantaneous power generation can be stopped.

  Mechanical vibration is an unpleasant by-product that leads to a worsening of the living environment. However, according to the present invention, mechanical vibration energy is converted into electric energy, so vibration energy that is dissipated as vibration or noise to the surroundings. As a result, the living environment is surely improved. This is a secondary effect of the present invention, but the present invention contributes to the improvement of the living environment.

  The present invention will be described with reference to the drawings.

FIG. 1 shows a lanthanide rare earth element (R) having a molar ratio of one or more elements R such as Tb, Dy, Sm, Ho, and Er, and Fe, and Fe of 1: 2. Among the R-Fe ₂ giant magnetostrictive alloy elements having a crystal structure, this is configured using a “Terfenol-D giant magnetostrictive element” made of a Tb-Dy-Fe alloy “Tb _0.27 Dy _0.73 Fe _1.91 ”. 1 shows one embodiment of a power generation rod that forms the core of the invention.

  The power generating rod 1z includes four 10 mmφ × 25 mm long giant magnetostrictive elements 1, two 10 mmφ × 5 mm long neodymium magnets 2 (disposed at both ends of the giant magnetostrictive element 1), and 10 mmφ × Three neodymium magnets having a length of 3 mm (arranged between the giant magnetostrictive elements 1) are alternately arranged and finished into one long rod-like body.

  Further, in order to amplify magnetization by the inverse magnetostriction effect (Villari effect) at both ends of the long rod-shaped body, an auxiliary yoke 3 having a length of 10 mmφ × 65.5 mm is disposed, and a power generation rod 1z having a total length of 250 mm is configured. ing. The auxiliary yoke 3 is preferably made of electromagnetic pure iron having a high magnetic permeability μ and a high saturation magnetic flux density, permalloy which is an Fe—Ni high magnetic permeability alloy, or soft ferrite.

  The giant magnetostrictive element that converts mechanical vibration energy into electric energy and the power generation rod 1z mainly composed of the auxiliary yoke are the core structures in the present invention.

  FIG. 5 shows a copper wire coil for power generation arranged on the outer periphery of the power generation rod and responsible for power generation, and its arrangement mode. The copper wire coil 17 is, for example, a copper wire wound around the outer periphery of a bakelite tube 17 ', and a power generation rod is inserted into the bakelite tube 17'.

  FIG. 2 shows an embodiment of a closed magnetic circuit structure including a power generation rod (see FIG. 1) and a copper wire coil (see FIG. 5). This structure includes three rod yokes 4 made of a soft magnetic material, an upper yoke board 5 and a bottom yoke board 6 for fixing the three rod yokes 4 at equal intervals, and a movable yoke 7 for taking in mechanical vibrations from the outside. It is composed of Incidentally, the mechanical vibration taken from the outside is transmitted from the mechanical vibration receiving rod 12 to the power generating rod through the movable yoke 7 as shown in FIG.

  FIG. 3 shows a preload mechanism in which a closed magnetic circuit structure (see FIG. 2) is housed and a preload is applied from the mechanical vibration receiving rod 12 to the power generating rod via the movable yoke 7.

  Three preload bolts 8 (for example, bolts made of SUS304) are arranged between the upper base 9 and the bottom base 10 and are fixed to the upper base 9 with a tightening nut 11. An appropriate load, for example, an appropriate preload of 7 to 10 MPa, is applied in advance to the power generating rod disposed inside by the tightening nut 11.

  Inverse magnetostriction configured by combining a power generation rod (see FIG. 1), a copper wire coil (see FIG. 5), a closed magnetic circuit structure (see FIG. 2), and a preload mechanism in FIGS. The type vibration generator is shown.

  As shown in FIG. 4, in the inverse magnetostrictive vibration power generator, various load resistors 13 are arranged on the copper coil terminal lead wires 16, and an ammeter 14 (specifically, non-electromagnetic current is measured). When a contact type current probe is used to capture an oscilloscope) and a voltmeter 15 that measures electromotive force (specifically, the voltage probe is used to capture an oscilloscope), the current and voltage during vibration power generation are the same using the oscilloscope. It can be monitored on the time axis.

  FIG. 7 shows an installation mode of the inverse magnetostrictive vibration generator. 7A shows the core of the vibration generator, FIG. 7B shows the front aspect of the vibration generator, and FIG. 7C shows the front aspect of the vibration generator.

  In this inverse magnetostrictive vibration power generator, an inverse magnetostrictive vibration power generator main body 27 is inverted and connected vertically on a super magnetostrictive actuator 28 for vibration generation capable of performing a drive test at an arbitrary frequency. And it is hold | maintained vertically via the resin bearing 19 distribute | arranged on the guide stand 29. FIG. Furthermore, an inertial mass (Reaction Mass) 18 is loaded on the inverse magnetostrictive vibration generator main body 27.

  The inverse magnetostrictive vibration generator shown in FIG. 7 has a structure in which a load load of 11.395 kg in total, that is, a moving mass is directly applied to the power generation rod inside the vibration generator main body. It has become.

If an acceleration sensor is installed above the inertial mass 18, the acceleration (m / s ² ) experienced by the power generation rod during the vibration power generation experiment can be monitored on an oscilloscope.

Incidentally, if the acceleration α (m / s ² ) of the dynamic mass M (kg) is measured by the acceleration sensor, mechanical energy E _m (externally applied to the giant magnetostrictive element mounted on the inverse magnetostrictive vibration generator) W) can be calculated by the following equation.
_{E m = Mα × (X 0} /2) / (1 / (f × 2)) = MαX 0 f (W) ···· (1)
Here, X _{0 is} peak-to-peak displacement (m), and f is drive frequency (Hz).

  The reason for doubling the frequency is that power generation is manifested both when the giant magnetostrictive element is compressed and when it is released from compression and returns to its original length.

Therefore, the power generation efficiency G _eff for the power energy E _e (W) generated by the inverse magnetostrictive vibration power generator can be obtained by the following equation.
G _eff = E _e / E _m (2)

  The vibration generator is installed directly in the foundation where mechanical vibrations are transmitted so that mechanical vibrations from the outside are directly and efficiently transmitted to the vibration generators. Like that. From the viewpoint of avoiding the complexity of installation work, reducing the installation cost, and facilitating the installation, install the vibration generator vertically on the foundation where mechanical vibration is transmitted or horizontally A configuration using an inertial mass (Reaction Mass) is preferable.

  FIG. 8 shows an aspect of a horizontal inverse magnetostrictive vibration generator equipped with a vibration deflector mechanism. 8A shows a front aspect of the horizontal inverse magnetostrictive vibration generator, FIG. 8B shows a planar aspect of the horizontal inverse magnetostrictive vibration generator, and FIG. 8C shows the horizontal inverse magnetostriction. The side aspect of a type | mold vibration generator is shown. The direction of mechanical vibration generated vertically in the vertical direction on the ground surface is turned 90 degrees and transmitted as horizontal vibration to an inverse magnetostrictive vibration generator installed horizontally.

  In FIG. 8, one end of a vibration deflector that vibrates around a bearing 23 is connected to a receiving rod 22 of the vibration power generator main body 20 via a cemented carbide ball 21. The vibration generator body 20 is held by a generator holder and inertia weight 26, and one vibration deflector 24 is fixed by an anchor bolt 25.

  If the horizontal inverse magnetostrictive vibration generator shown in FIG. 8 is set to a height of 150 mm or less, it will not interfere with the train operation even if it is installed on the sleepers that support the train track. Vibration energy generated in large quantities can be converted into electric power.

  Next, examples of the present invention will be described. The conditions of the examples are one example of conditions adopted for confirming the feasibility and effects of the present invention, and the present invention is limited to this one example of conditions. Is not to be done. The present invention can adopt various conditions as long as the object of the present invention is achieved without departing from the gist of the present invention.

(Example 1)
As shown in FIG. 7, the vibration generator is disposed on the vibration actuator, and the vibration actuator is vibrated at an arbitrary drive frequency and an arbitrary drive output displacement. The electromotive voltage was measured simultaneously.

  Table 1 shows an inverse magnetostrictive power generation using a copper wire coil having a wire diameter of 0.25 mmφ, a coil winding number of 1000, a coil length of 120 mm, and a coil DC resistance value of 18.5Ω and oscillating at a dynamic mass of 11.395 kg. The result of a test is shown.

(Example 2)
Table 2 shows a reverse magnetostrictive power generation test conducted using a copper wire coil having a wire diameter of 0.25 mmφ, a coil winding number of 2000, a coil length of 120 mm, and a coil DC resistance value of 38Ω, and being vibrated with a dynamic mass of 11.425 kg. Results are shown. The reason why the dynamic mass is different from the dynamic mass of Example 1 is that the coil weight has changed due to the difference in the number of turns of the copper wire coil.

(Example 3)
Table 3 shows an inverse magnetostrictive power generation using a copper wire coil having a wire diameter of 0.25 mmφ, a coil winding number of 4000, a coil length of 120 mm, and a coil DC resistance value of 81.5Ω and oscillating at a dynamic mass of 11.485 kg. The result of a test is shown.

(Example 4)
Table 4 shows an inverse magnetostrictive power generation test conducted using a copper wire coil having a wire diameter of 0.5 mmφ, a coil winding number of 1000, a coil length of 120 mm, and a coil DC resistance value of 5.4 Ω and being vibrated with a dynamic mass of 11475 kg. Results are shown.

(Example 5)
In Table 5 and FIG. 9, using a copper wire coil having a wire diameter of 0.6 mmφ, a coil winding number of 2590, a coil length of 120 mm, and a coil DC resistance value of 12.1Ω, the vibration was reversed with a dynamic mass of 11.940 kg. The result of a magnetostrictive power generation test is shown.

  As described above, in the result of conducting the reverse magnetostrictive power generation test using copper wire coils having five different wire diameters and winding numbers, the largest power was obtained in Test No. 5 in Example 5. 27. At this time, the obtained power was a maximum power of 9.18 W and an effective power of 4.59 W.

Incidentally, at this time, the acceleration sensor measured the acceleration α = 304 (m / s ² ) when the giant magnetostrictive element mounted inside the inverse magnetostrictive vibration generator expands and contracts due to external mechanical vibration. , by substituting the above equation (1), when obtaining the mechanical vibration energy E _m, the equation (3).
_{E m = Mα × (X 0} /2) / (1 / (f × 2)) = MαX 0 f (W) ··· (1)
E _m = 11.940 × 304 × 100 × 10 ⁻⁶ × 129 = 46.8 (W) (3)

Next, by substituting E _m = 46.8 (W) obtained from equation (3) and the above-mentioned effective power E _e = 4.59 (W) into equation (2), the power generation efficiency G _eff is _calculated . If it calculates | requires, it will become (4) Formula.
G _eff = E _e / E _m = 4.59 / 46.8 = 0.0981 (4)

  That is, from the above equation (4), it was found that about 9.8% of the mechanical vibration energy was converted into electric energy on the basis of effective power. Incidentally, the power generation efficiency was 19.6% on a maximum power basis.

  In this test, the maximum electromotive force was obtained in Test No. 5 in Example 5. At 25, the maximum electromotive force was ± 39.2V. In this test, the maximum electromotive current was obtained in Test No. 4 in Example 4. At 24, the maximum electromotive current was ± 1.32A.

  The present invention is preferably implemented in, for example, the Yamanote Loop Line or the Subway Line in urban areas where large mechanical vibrations can be obtained intensively within a relatively small area.

  The present invention is a vibration generator of a practical scale that produces electric power from the large mechanical vibration that the sleepers supporting the track receive when passing through the train, and even if the amount of power generated individually by the vibration generator is small, vibration power generation Since the machine itself is compact and the installation cost is low, if you install several hundred to several thousand units on sleepers, you can use solar power or wind power generation with the power of the number of generators. It can counter the amount of power generation.

  For that purpose, it is essential to suppress the height of the vibration generator to 150 mm or less so as not to interfere with train operation by installing it between sleepers, but in the present invention, a vibration deflector mechanism is disposed. Thus, the height of the vibration generator can be suppressed to 150 mm or less.

  Furthermore, according to the present invention, it is possible to install thousands of vibration generators along a long coastline such as Kujukuri Beach and produce electric power from wave energy.

  The waves rushing to the shore are not synchronized with the horizontal line, but the rushing waves and the pulling waves are alternately pulsing with a width of about 50 to 100 m, so there are several vibration generators along the shoreline. By arranging 1,000 units, even if the power generation time by each vibration generator is short, the vibration generator group as a whole can produce a large amount of electric power while continuously generating power.

  In addition, in urban areas, by using the present invention from mechanical vibrations that are constantly generated from factory motors and machine tools, and mechanical vibrations that are generated on highway bridge girders and piers, there is no environmental damage. If clean electricity can be produced, social and economic contributions are immeasurable.

The core of an inverse magnetostrictive vibration generator, super magnetostrictive alloy elements and neodymium magnets are alternately laminated, and a soft magnetic auxiliary yoke such as a long electromagnetic pure iron is installed at both ends to provide super magnetostriction. It is a figure which shows the structure of the giant magnetostriction alloy element and auxiliary yoke which amplify the change of the magnetization which arises by the mechanical vibration inside an alloy element. It is a figure which shows the structure of the closed magnetic circuit with respect to the giant magnetostrictive alloy element and auxiliary yoke which are shown in FIG. It is composed of three rod yokes made of a soft magnetic material such as electromagnetic pure iron, an upper yoke board, a bottom yoke board, and a movable yoke that takes in mechanical vibrations from the outside. It is a figure which shows the structure of the preload mechanism arrange | positioned on the outer side of the magnetic circuit mechanism shown in FIG. It consists of three preload bolts made of SUS304 (nonmagnetic stainless steel), an upper base, and a bottom base, and an appropriate preload of 7 to 10 MPa is applied to the giant magnetostrictive alloy element inserted inside by a tightening nut. . It is a figure which shows the structure of a reverse magnetostrictive vibration generator. Various load resistances are connected to the terminal lead wire of the copper wire coil arranged on the outer periphery of the giant magnetostrictive alloy element, and the electromotive current and electromotive voltage can be monitored on an oscilloscope. It is a figure which shows the aspect of the copper wire coil for electric power generation produced by winding a copper wire on a bakelite tube. The giant magnetostrictive alloy element and auxiliary yoke shown in FIG. 1 are inserted into the bakelite tube. It should be noted that the bakelite tube is not subjected to any preload. It is a figure which shows the structure of a reverse magnetostrictive vibration generator. The positional relationship of a giant magnetostrictive alloy element, a magnetization amplification auxiliary yoke, and a copper wire coil is shown. It is a figure which shows the aspect which connected the inverse magnetostriction type vibration generator to the actuator for vibration excitation in order to perform the experiment of a reverse magnetostriction type electric power generation. (A) shows the core part of a vibration generator, (b) shows the front mode of a vibration power generator, and (c) shows the front mode of a vibration power generator. An inertial mass is loaded on the inverse magnetostrictive vibration generator. The inverse magnetostrictive vibration generator is subjected to vertical vibrations without being collapsed by a resin bearing disposed on a guide stand installed on the outside. It is a figure which shows the structure of the horizontal inverse magnetostrictive vibration generator which mounts a vibration deflector mechanism. (A) shows the front aspect of a horizontal inverse magnetostrictive vibration generator, (b) shows the plane aspect of a horizontal inverse magnetostrictive vibration generator, and (c) shows the side of the horizontal inverse magnetostrictive vibration generator. An aspect is shown. The mechanical vibration generated in the vertical direction on the ground surface is turned 90 degrees to transmit the vibration to the inverse magnetostrictive vibration generator installed horizontally as horizontal vibration. Test No. 5 in Example 5 27 is a diagram showing the relationship between the generated power and load resistance in FIG. When the load resistance is 30Ω, a maximum power of 9.18 W and an effective power of 4.59 W are obtained.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Giant magnetostrictive element 1z Power generation rod 2 Neodymium magnet 3 Auxiliary yoke 4 Rod yoke 5 Upper yoke board 6 Bottom yoke board 7 Movable yoke 8 Preload bolt 9 Upper base 10 Bottom base 11 Tightening nut 12 Mechanical vibration receiving rod 13 Load resistance 14 Ammeter 15 Voltmeter 16 End lead wire of copper wire coil 17 Copper wire coil 17 'Bakelite tube 18 Inertial mass 19 Resin bearing 20 Generator main body 21 Carbide ball 22 Vibration receiving rod 23 Bearing 24 Vibration deflector 25 Anchor bolt 26 Generator holder Inertial mass 27 Inverse magnetostrictive vibration generator body 28 Actuator for vibration 29 Guide stand

Claims (7)

Tb the lanthanide rare earth element (R), Dy, Sm, Ho, and the molar ratio of one or more and Fe of Er is 1: 2, and, R-Fe ₂ system than with a Laves crystalline structure In a vibration generator that encloses a magnetostrictive alloy element with a copper wire coil and transmits vibration to the element to generate electricity,
(A1) A ferromagnetic magnet for applying a magnetic bias is disposed at both ends of the giant magnetostrictive alloy element, and a magnetic auxiliary yoke for amplifying the magnetization is disposed outside the ferromagnetic magnets at both ends. A closed magnetic circuit, and
(B) A vibration generator in which vibration receiving means is connected to the auxiliary yoke. Tb the lanthanide rare earth element (R), Dy, Sm, Ho, and the molar ratio of one or more and Fe of Er is 1: 2, and, R-Fe ₂ system than with a Laves crystalline structure In a vibration generator that encloses a magnetostrictive alloy element with a copper wire coil and transmits vibration to the element to generate electricity,
(A2) A ferromagnetic magnet for applying a magnetic bias is disposed between and at both ends of the giant magnetostrictive alloy element, and a magnetic auxiliary yoke that has a magnetization amplification action outside the ferromagnetic magnets at both ends. To form a closed magnetic circuit, and
(B) A vibration generator in which vibration receiving means is connected to the auxiliary yoke.   The vibration generator according to claim 1 or 2, wherein the ferromagnetic magnet is a neodymium rare earth magnet.   The vibration generator according to any one of claims 1 to 3, wherein the magnetic body is electromagnetic pure iron, an Fe-Ni-based high permeability alloy, or soft ferrite. 5. The vibration generator according to claim 1, wherein the length of the auxiliary yoke is 5% or more and less than 100% of the total length of the R—Fe ₂ giant magnetostrictive alloy element.   The vibration generator according to any one of claims 1 to 5, further comprising a vibration direction conversion mechanism that rotates mechanical vibration 90 degrees and transmits the mechanical vibration to the vibration receiving means.   The vibration generator according to claim 6, wherein the vibration generator has a height of 150 mm or less and can be installed horizontally.

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