JP2010283948A - Generation device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To highly efficiently generate power while a power generation device generating power by electromagnetic induction is miniaturized. <P>SOLUTION: The power generation device is provided with a permanent magnet 14, yokes 12 and 13 which are magnetically connected to the permanent magnet 14 and form a magnetic path and coils 11A and 11B installed in the yokes 12 and 13. The yokes are separated into the fixed yoke 12 and the movable yoke 13. The movable yoke 13 is relatively reciprocated to the fixed yoke 12 in a uniaxial direction (X1, X2 direction). Thus, a magnetic flux change is caused in magnetic flux flowing between the yokes 12 and 13 by bringing the yokes 12 and 13 into contact with each other and by dividing them. Then, induced electromotive force is caused in the coils 11A and 11B by the magnetic flux change. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a power generation device, and more particularly to a power generation device that generates power by electromagnetic induction.

  In recent years, various wireless electronic devices have been provided using a radio frequency band of 2.5 GHz that is widely open to electronic devices. As one of them, a wireless switch is known. This wireless switch is disposed on a wall or the like, for example, and is used to turn on / off a lighting fixture.

  In such a wireless switch, it is conceivable to use a dry cell or an indoor 100V power source as the power source. However, if a dry cell is used, the replacement is troublesome, and if an indoor power source is used, a wireless switch is provided. The position is fixed and cannot be moved, and in either case, the usability is poor. For this reason, it has been proposed to improve the usability of the wireless switch by providing a power generation device in the wireless switch.

  Conventionally, as a power generation device mounted on such a small electronic device, a magnetic flux penetrating the coil is changed by rotating a disk-shaped magnet inside the coil as shown in Patent Document 1, thereby generating power. A power generator to perform is known. As another power generation device, as shown in Patent Document 2, the magnet is configured to move relative to the planar coil, and the magnetic flux penetrating the planar coil is changed by the movement of the magnet, thereby generating power. There was a power generator to do.

JP 2005-102413 A JP 2004-159407 A

  However, the power generation device having a structure in which the annular magnet is rotated inside the coil needs to dispose the coil outside the disk-like magnet, and there is a problem that the shape of the device becomes large. In addition, there is a problem that the electromotive force is weak until the magnet reaches a predetermined rotation speed, and the rise time of power generation becomes long.

  On the other hand, a power generation device having a structure in which a magnet is moved with respect to a planar coil needs to provide a moving space for moving a relatively large magnet in the device, and there is a problem that the device is also increased in size. .

  The present invention has been made in view of the above points, and an object of the present invention is to provide a power generation apparatus that can perform highly efficient power generation while achieving downsizing.

From the first point of view, the above problem is
A permanent magnet (14);
Yokes (12, 13) magnetically connected to the permanent magnet (14) and forming a magnetic path of magnetic flux of the permanent magnet (14);
A power generator having coils (11A, 11B) mounted on the yoke (12, 13),
Separating the yoke into a first yoke part (12) and a second yoke part (13);
The first and second yoke portions (12, 13) are reciprocated relatively in one axial direction (X1, X2 direction) to contact and separate from each other, thereby moving the first and second yokes (12, 13). Generate magnetic flux change in the flowing magnetic flux,
This can be solved by a power generator that generates an induced electromotive force in the coils (11A, 11B) by the magnetic flux change.

  In addition, the said reference code is a reference to the last, and description of a claim is not limited by this.

  The disclosed power generation apparatus generates an induced electromotive force in the coil by relatively reciprocating the separated first and second yoke portions in a uniaxial direction, so that the apparatus can be thinned.

FIG. 1 is a perspective view of a power generator according to an embodiment of the present invention. FIG. 2 is a perspective view of a main part of a wireless switch equipped with a power generation device according to an embodiment of the present invention. 3A and 3B are diagrams showing a power generation apparatus according to an embodiment of the present invention, in which FIG. 3A is a plan view, FIG. 3B is a front view, FIG. 3C is a bottom view, and FIG. ) Is a right side view. FIG. 4 is a view for explaining the operation of the power generation apparatus according to the embodiment of the present invention, and is a perspective view with a partial cross section showing a state where the fixed yoke and the movable yoke are adsorbed. FIG. 5 is a diagram for explaining the operation of the power generation apparatus according to the embodiment of the present invention, and is a perspective view with a partial cross section showing a state where the fixed yoke and the movable yoke are separated from each other. 6A and 6B are cross-sectional views showing magnetic fluxes flowing through the fixed yoke and the movable yoke. FIG. 6A shows a state where the fixed yoke and the movable yoke are attracted, and FIG. 6B shows a state where the fixed yoke and the movable yoke are separated. FIG. FIG. 7 is a perspective view showing a modification of the power generation device shown in FIG. 8A and 8B are cross-sectional views showing magnetic fluxes flowing through the fixed yoke and the movable yoke in the power generation device according to the modification. FIG. 8A is a diagram showing a state where the fixed yoke and the movable yoke are attracted, and FIG. It is a figure which shows the state which the yoke separated.

  Next, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows a power generation device 10A according to an embodiment of the present invention, and FIG. 2 shows a wireless switch 1 as an example of an electronic device on which the power generation device 10A is mounted.

  The power generation device 10A includes coils 11A and 11B, a yoke, a permanent magnet 14, and the like. In this power generation apparatus 10A, as will be described in detail later, the yoke is composed of a fixed yoke 12 and a movable yoke 13, and power generation is performed by reciprocating the movable yoke 13 in the directions of arrows X1 and X2 with respect to the fixed yoke 12. It is set as the structure which performs.

  The wireless switch 1 shown in FIG. 2 is configured to be equipped with the power generator 10A. The wireless switch 1 is provided with a push button 3, a yoke drive mechanism 4, a high-frequency communication device (not shown), and the like in addition to the power generation device 10A.

  The push button 3 is configured to be operable in the arrow A1 direction in the figure. When the operator presses the push button 3 in the direction of the arrow A1, this operating force is transmitted to the yoke drive mechanism 4. The yoke drive mechanism 4 has a rotating member 5, a swing arm 6, and the like.

  The rotating member 5 is configured to rotate 180 degrees by one pressing operation of the push button 3 in the A1 direction. In addition, six operation projections 5 a are formed on the upper surface of the rotating member 5. The operation protrusion 5 a is configured to engage with the swing arm 6 as the rotating member 5 rotates.

  The swing arm 6 is configured to be swingable in the directions of arrows B1 and B2 about the support shaft 7. Further, a connecting shaft 8 is provided in the vicinity of the support shaft 7, and the connecting shaft 8 is engaged with a mounting hole 21 of the movable yoke 13 constituting the power generation apparatus 10A. Therefore, when the swing arm 6 swings, the movable yoke 13 moves in the directions of arrows X1 and X2 in FIG.

  As described above, the rotating member 5 rotates 180 degrees by a single pressing operation of the push button 3 in the A1 direction. In addition, six operation protrusions 5 a are formed on the rotating member 5 at equal intervals. For this reason, while the rotating member 5 rotates 180 degrees, the three operation projections 5a engage with the swing arm 6 to swing the swing arm 6.

  Therefore, the yoke drive mechanism 4 reciprocates the movable yoke 13 of the power generation apparatus 10A three times in the X1 and X2 directions by operating the push button 3 once. When the movable yoke 13 moves in the X1 and X2 directions, the power generation device 10A generates an induced electromotive force, and this induced electromotive force is sent to the high-frequency communication device via the terminal 16. As a result, the high-frequency communication device transmits a 2.5 GHz band radio wave to an electrical device (for example, a lighting device) operated by the wireless switch 1 to turn the electrical device on / off.

  Next, each component of the power generation apparatus 10A will be described with reference to FIGS. 3 to 5 in addition to FIG. FIG. 3 is a hexahedral view of the power generator 10A, and FIGS. 4 and 5 are cross-sectional views of the power generator 10A.

  The power generation apparatus 10A according to the present embodiment is provided with two coils 11A and 11B. The coils 11A and 11B are wound around a resin bobbin 15. As a specific example of the coils 11A and 11B, the diameter of the coil wire is 0.10 mm, the number of coil turns of each coil 11A and 11B is 708 (1416 in total), and the winding resistance of each coil 11A and 11B is 28.28Ω (56,57Ω in total).

  The yoke is formed of a soft magnetic material (for example, iron). The present embodiment is characterized in that the yoke is separated into a fixed yoke 12 and a movable yoke 13 (first and second yoke portions described in claims). The fixed yoke 12 has an extending portion 12A and an extending portion 12B that are bifurcated. The extending portion 12A is inserted into the coil 11A, and the extending portion 12B is inserted into the coil 11B. At this time, the extending portion 12A is fixed in the coil 11A, and the extending portion 12B is also fixed in the coil 11B.

  A field permanent magnet 14 is provided on a portion of the fixed yoke 12 exposed from the bobbin 15. The permanent magnet 14 is a single pole magnetized one. The permanent magnet 14 is magnetically connected to the fixed yoke 12.

  In the present embodiment, the extending portion 12A and the extending portion 12B are connected at the connecting portion 12C. Therefore, since the extension part 12A and the extension part 12B can be handled integrally, workability at the time of mounting on the coils 11A and 11B can be improved.

  Further, a fixing hole 20 is formed in a portion exposed from the bobbin 15 of the fixed yoke 12. The power generation device 10 </ b> A is fixed to the case 2 by inserting a fixing screw (not shown) into the fixing hole 20 and screwing it into a screw hole formed in the case 2.

  The movable yoke 13 has extending portions 13A and 13B branched in a bifurcated manner. The extending portion 13A is inserted into the coil 11A, and the extending portion 13B is inserted into the coil 11B. At this time, the extending portions 13A and 13B are configured to be movable in the coils 11A and 11B. Further, when the extending portions 13A and 13B move in the coils 11A and 11B, the movement of the extending portions 13A and 13B is guided by the bobbin 15, and therefore only in the directions of arrows X1 and X2 in the figure. That is, the movable yoke 13 is configured to reciprocate only in one axial direction.

  A mounting hole 21 is formed in a portion of the movable yoke 13 exposed from the bobbin 15. The mounting hole 21 is connected to a connecting shaft 8 provided in the swing arm 6. Therefore, when the swing arm 6 swings in the B1 and B2 directions as described above, the movable yoke 13 reciprocates in the directions of the arrows X1 and X2 in the figure via the connecting shaft 8.

  As described above, in this embodiment, the yoke is separated into the fixed yoke 12 and the movable yoke 13, but the weights of the yokes 12 and 13 are different. Specifically, the weight of the movable yoke 13 is set to be lighter than the weight of the fixed yoke 12 fixed to the case 2. That is, the heavy fixed yoke 12 is fixed, and the light movable yoke 13 is movable with respect to the fixed yoke 12.

  In this way, by setting the weight of the movable yoke 13 that performs reciprocal movement light, the operation force of the push button 3 can be reduced, and the mechanical strength of the yoke drive mechanism 4 provided in the wireless switch 1 can be reduced. Reduction can be achieved. Furthermore, since the movable yoke 13 is set to be lighter than the fixed yoke 12, the speed of the movable yoke 13 can be increased, so that the amount of power generation can be increased.

  FIG. 4 shows a state in which the movable yoke 13 is attracted to the fixed yoke 12 by moving in the arrow X2 direction (hereinafter, this state is referred to as an attracted state). As described above, since the fixed yoke 12 is provided with the permanent magnet 14, the movable yoke 13 is attracted to the fixed yoke 12 by the magnetic force of the permanent magnet 14.

  Further, the distal end portions 17A and 17B of the extending portions 12A and 12B and the distal end portions 18A and 18B of the extending portions 13A and 13B are flat surfaces. Therefore, in the attracted state, the end portions 17A and 17B of the extending portions 12A and 12B and the end portions 18A and 18B of the extending portions 13A and 13B are in contact with each other. Therefore, the number of magnetic fluxes flowing can be increased at the contact position between the distal end portion 17A and the distal end portion 18B and at the contact position between the distal end portion 17B and the distal end portion 18B.

  On the other hand, FIG. 5 shows a state where the movable yoke 13 is moved away from the fixed yoke 12 by moving in the arrow X1 direction (hereinafter, this state is referred to as a separated state). Thus, since the movable yoke 13 is separated from the fixed yoke 12 in the separated state, an air layer having a high magnetic resistance is formed between the fixed yoke 12 and the movable yoke 13. Therefore, the flow of magnetic flux is blocked between the tip portion 17A and the tip portion 18B and between the tip portion 17B and the tip portion 18B.

  Next, the power generation principle of the power generation apparatus 10A will be described with reference to FIG.

  The power generator 10A is configured to generate power using electromagnetic induction. Assuming that the induced electromotive voltage [V] is e (t), the number of coil turns [turns] is N, the magnetic flux [Wb] is φ (t), and the moving amount [m] of the movable yoke 13 is x (t), e (t) = − N (dφ / dt) = − N × (dφ / dx (t)) × (dx (t) / dt). Therefore, it can be seen from this equation that an induced electromotive voltage e (t) is generated in proportion to the change in the number of magnetic fluxes depending on the position of the movable yoke 13 and the moving speed of the movable yoke 13.

  FIG. 6A shows the power generation device 10A in an adsorption state. Since the movable yoke 13 is attracted to the fixed yoke 12 in this attracted state, the magnetic flux of the permanent magnet 14 forms a closed magnetic circuit in each of the yokes 12 and 13 as indicated by solid arrows in FIG. Therefore, the number of magnetic fluxes (hereinafter referred to as complex magnetic fluxes) penetrating the coils 11A and 11B is large.

  On the other hand, when the power generation device 10A is separated by moving the movable yoke 13 in the X1 direction as shown in FIG. 6B, the magnetoresistive circuit includes the fixed yoke 12 and the movable yoke 13. A high air layer (air gap) is formed. As a result, the magnetic flux of the permanent magnet 14 forms a closed magnetic path at a position close to the permanent magnet 14 of the fixed yoke 12 as indicated by the solid line arrow in FIG. 6B, and the interlaced magnetic flux for the coils 11A and 11B. The number decreases rapidly.

  As described above, the complex magnetic field penetrating the coils 11A and 11B in the attracted state and the separated state suddenly changes in a short time, so that an induced electromotive force due to electromagnetic induction is generated in the coils 11A and 11B. Based on the above principle, the power generation apparatus 10A generates power.

Here, since the power generation device 10A configured as described above is configured to generate power by moving the thin plate-shaped movable yoke 13 in the uniaxial direction (X1, X2 direction), a configuration in which a magnet is rotated as in the related art. Compared to the configuration in which the magnet is moved, the apparatus can be made thinner. In addition, the power generation apparatus 10A according to the present embodiment moves the magnets in order to generate power by rapidly changing the complex magnetic field by separating or attracting the yokes 12 and 13 without moving the permanent magnets 14. As a result, it is possible to generate a rapid magnetic flux change compared to a configuration in which power generation is performed, and it is possible to shorten the rise time of power generation. Further, the current flows between the pair of yokes 12 and 13 as in the present embodiment. In the configuration in which the magnetic flux is rapidly changed, eddy currents may be generated in the yokes 12 and 13. The generation of the eddy current causes a decrease in power generation efficiency and may adversely affect the high-frequency communication device or the like due to the generation of Joule heat. However, generation of eddy currents can be suppressed by making the yokes 12 and 13 have a structure in which metal layers are laminated.

  7 and 8 illustrate a power generation device 10B that is a modification of the power generation device 10A described with reference to FIGS. 1 to 6. 7 and 8, the same reference numerals are given to the components corresponding to those shown in FIGS. 1 to 6, and the description thereof will be omitted.

  The power generation device 10A described above has a configuration in which the extending portion 12A and the extending portion 12B of the fixed yoke 12 are connected by the connecting portion 12C in consideration of workability during assembly. However, in the configuration having the connecting portion 12C, this connecting portion 12C also forms a magnetic path. In addition to the flow of magnetic flux contributing to power generation indicated by the solid line in FIG. A loop of magnetic flux passing through the connecting portion 12C indicated by the broken line is generated. When the flow of magnetic flux passing through the connecting portion 12C is generated, the number of magnetic fluxes contributing to power generation is reduced, and the power generation efficiency is lowered.

  Therefore, in the present modification, the connecting portion 12C is removed, a magnetic gap 22 is formed between the extending portion 19A and the extending portion 10B constituting the fixed yoke 19, and the permanent magnet 14 is disposed in the magnetic gap 22. It is characterized by that. In the present deformability, the extending portion 19A and the extending portion 10B are separated into two parts, and the permanent magnet 14 is disposed between them.

  Thus, by removing the connecting portion 12C, the generation of a magnetic flux loop that reduces the power generation efficiency during adsorption is suppressed as shown in FIG. 8A. Therefore, according to the power generation device 10B according to the present modification, it is possible to perform power generation with higher efficiency.

  The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific embodiments described above, and various modifications are possible within the scope of the gist of the present invention described in the claims. It can be modified and changed.

  For example, in the above-described embodiment, an example in which the power generation devices 10A and 10B are applied to the wireless switch 1 is shown. However, the application of the power generation device according to the present invention is not limited to this, and so-called battery-less operation is desired. It can be applied to various electric devices and electronic devices.

DESCRIPTION OF SYMBOLS 1 Wireless switch 3 Push button 4 Yoke drive mechanism 6 Swing arm 7 Support shaft 8 Connection shaft 10A, 10B Power generator 11A, 11B Coil 12 Fixed yoke 12A, 12B, 13A, 13B, 19A, 19B Extension part 12C Connection part 13 Movable yoke 14 Permanent magnet 15 Bobbins 17A, 17B, 18A, 18B Tip 19 Fixed yoke 22 Magnetic gap

Claims (4)

With permanent magnets,
A yoke magnetically connected to the permanent magnet and forming a magnetic path of magnetic flux of the permanent magnet;
A power generator having a coil mounted on the yoke,
Separating the yoke into a first yoke part and a second yoke part;
By causing the first and second yoke parts to reciprocate relatively in one axial direction to contact and separate, a magnetic flux change is generated in the magnetic flux flowing through the first and second yoke parts,
A power generator that generates an induced electromotive force in the coil by the magnetic flux change. Different weights of the first yoke part and the second yoke part;
2. The first and second yoke parts are brought into contact with and separated from each other by fixing a heavy yoke part and moving a light yoke with respect to the heavy yoke part. Power generator.   3. The power generator according to claim 1, wherein a magnetic gap for cutting a magnetic path is provided in the yoke, and the permanent magnet is disposed in the magnetic gap. The power generation apparatus according to any one of claims 1 to 3, wherein the yoke has a structure in which metal layers are stacked.

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