Self power generation device

Abstract

To provide a self power generation device in which a positional relation between a magnetic circuit and a permanent magnet is changed by linear motion and the magnetic circuit having a magnetic flux direction changed is immediately formed.SOLUTION: In a coil unit 12, a coil 19 is wound around the outer circumference of a core main body 17b, slide surfaces 17d and 17e with a prescribed distance d are disposed in front of and behind the coil 19, and respective slide pieces 21, 22 are disposed thereon. In a magnet unit 13, a permanent magnet 14 is sandwiched vertically between U-shaped magnetic flux paths 15 and 16, and a pair of pole pieces 15a and 16a of the respective magnetic flux paths are opposed to each other and disposed at the sides in front of and behind the coil 19. In the process of movement of the core main body 17b from a first position to a second position, the two slide pieces move on the slide surfaces with magnetic forces from the pole pieces.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a stand-alone power generating device that varies magnetic flux passing through an induction coil by mechanical variation and converts the magnetic flux into electrical energy. [Background technology]

[0002] As a device that generates a current autonomously and transmits a mechanical fluctuation to the outside without a power source or connection to an external electric wiring, an autonomous power generating device as exemplified in Patent Documents 1 to 3 is known. As shown in each of these Patent Documents, a very small wireless radio is placed in the vicinity of the autonomous power generating device. The autonomous power generating device and the wireless radio work together to perform a series of operations in which the power generated by the mechanical fluctuation is supplied to the wireless radio, and the wireless radio wirelessly transmits the occurrence of the mechanical fluctuation.

[0003] According to the techniques of Patent Documents 1 and 2, a magnetic circuit passing through a central opening of an excitation coil and an upper layer movable piece and a lower layer movable piece connected to the upper and lower poles of a permanent magnet are disclosed, and both ends of the magnetic circuit are arranged between the upper layer movable piece and the lower layer movable piece, and by swinging the upper layer movable piece and the lower layer movable piece, one end of the magnetic circuit is moved to a first extreme position where the upper layer movable piece and the other end of the magnetic circuit are moved to a second extreme position where the upper layer movable piece and one end of the magnetic circuit are moved to a lower layer movable piece, thereby changing the direction of the magnetic flux of the magnetic circuit. A wireless module is operated by the electric energy generated by the excitation coil to perform wireless transmission. According to the technique of Patent Document 3, a magnetic conductive plate is attached to each pole of a permanent magnet, an iron core of a coil is arranged to face one of the magnetic conductive plates, and the magnetic conductive plate facing the iron core of the coil is switched by moving the permanent magnet up and down, thereby changing the direction of the magnetic flux of the iron core.

[0004] Unlike rotary generators, which generate electricity when a continuous rotational motion is applied as a mechanical fluctuation, stand-alone power generators capture mechanical fluctuations that occur instantaneously and intermittently to generate electricity instantaneously. Since the amount of electricity generated by stand-alone power generators depends on the change in magnetic flux, the technologies in each patent document use an elastic body to further accelerate the rate of change of the external mechanical fluctuation and increase the amount of change in magnetic flux.

[0005] As such a device, the technologies in each patent document accelerate the mechanical fluctuation by temporarily storing the external mechanical fluctuation in an elastic body and then releasing it all at once. For example, Patent Document 1 uses a leaf spring as such an elastic body, Patent Document 2 uses an elastic piece, and Patent Document 3 uses a spring element. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Special Publication No. 2009-516802 [Patent Document 2] Special Publication No. 2022-552337 [Patent Document 3] JP 2018-153094 A DISCLOSURE OF THEINVENTION [Problem to be solved by the invention]

[0007] According to the technologies of Patent Documents 1 and 2, the magnetic circuit and the permanent magnet change their relative positions in response to external mechanical fluctuations by swinging about a specific rotation axis. For this reason, it is easy to use as a switch operated by a natural person, but it is difficult to use when the mechanical fluctuation is simply linear motion.

[0008] On the other hand, according to the technology of Patent Document 3, a permanent magnet is movably installed between two chute panels with chutes extending vertically on opposing surfaces, and the permanent magnet is moved linearly up and down along the chute to change the relative positions of the magnetic circuit and the permanent magnet in response to external mechanical fluctuations. However, in this technology, the magnetic circuit including the permanent magnet does not form a closed loop with a magnetic conductive plate.

[0009] Furthermore, in the technologies of all of the patent documents, either the magnetic circuit side or the permanent magnet side is moved as a whole, and since the mass to be moved is large, there is a limit to how much the acceleration of the mechanical fluctuation can be increased even if the elastic force stored in an elastic body is used.

[0010] The object of the present invention is to provide an independent power generating device that uses linear motion to change the relative positions of a magnetic circuit and a permanent magnet, and instantaneously forms a magnetic circuit with a changed magnetic flux direction, and also to provide an independent power generating device that generates power by directly utilizing external linear motion. [Means for solving the problem]

[0011] The self-sustaining power generating device of the present invention comprises a coil unit in which a coil is wound around an outer periphery of a core body having a length in the core axis direction, sliding surfaces having a predetermined distance in the core axis direction are provided on the front and rear sides of the outer periphery of the core body to sandwich the coil, and front and rear slide pieces that slide on the front and rear sliding surfaces, respectively. a magnetic flux passage having a U-shape in a side view of a soft magnetic body provided for each of the upper and lower magnetic poles of a permanent magnet, the magnetic flux passages overlap with a distance between them, one on the inside and the other on the outside, with the permanent magnet in between, and the pole pieces at both ends of the magnetic flux passages face each other to form a pair, and magnet units are provided at the front and rear of the coil, The front pair of pole pieces are arranged to sandwich a front slide piece in the core axis direction, and the rear pair of pole pieces are arranged to sandwich a rear slide piece in the core axis direction, When the core body is in a first position on the front side, the front slide piece is in contact with the front pole piece of the pair of front pole pieces, and the front slide piece is in contact with the front pole piece of the pair of rear pole pieces, When the core body is in the second position on the rear side, the front slide piece is in contact with the rear pole piece of the pair of front pole pieces, and the rear slide piece is in contact with the rear pole piece of the pair of rear pole pieces, The present invention is characterized in that, in the process in which the core body moves from the first position to the second position, the two slide pieces move on the sliding surfaces by magnetic forces from the pole pieces. Effect of the Invention

[0012] According to the present invention, it is possible to provide an independent power generating device that utilizes linear motion as it is, has a fast response speed, and increases the electromotive force by increasing the change in magnetic flux passing through the coil of the magnetic circuit. [Brief description of the drawings]

[0013] [Figure 1] FIG. 2 is a cross-sectional view of a clamp device equipped with an independent power generation device. [Diagram 2] FIG. 2 is a diagram illustrating an independent power generation device. [Diagram 3] FIG. 2 is a diagram illustrating components of the independent power generating device. [Figure 4] FIG. 2 is a diagram illustrating components of the independent power generating device. [Diagram 5] FIG. 2 is a diagram illustrating the operation of the independent power generation device. [Figure 6] 10A and 10B are diagrams illustrating the effects of an independent power generation device. [Figure 7] FIG. 13 is a diagram for explaining another embodiment. BEST MODE FOR CARRYING OUT THEINVENTION

[0014] An independent power generating device according to an embodiment of the present invention will now be described. Fig. 1 shows a cross section of a clamp device 1 equipped with an independent power generating device. The overall structure of the clamp device will be described with reference to the figure. The clamp device 1 is equipped with an output member 5 that moves up and down. The independent power generating device 100 is installed in the clamp device 1 together with a wireless module 101.

[0015] In the clamp device 1, pressure oil or compressed air is supplied to a cylinder bore 3 drilled in a housing 2 to move a piston portion 5b up and down. The cylinder bore 3 is a space formed inside a ceiling portion 2a, a bottom portion 2b, and a body wall 2c extending in the vertical direction and between the body wall 2c. A part of an output member 5 penetrates to the outside of the housing 2 through a cylindrical hole 4 formed in the ceiling portion 2a of the housing 2. The output member 5 is hermetically inserted into the cylindrical hole 4 so as to be rotatable around a center line C and so as to be movable in the vertical direction (the direction of the center line C).

[0016] The output member 5 has a rod body 5a formed in this order from the top, a piston portion 5b having a larger diameter than the rod body 5a, and a lower rod 5c further below. A guide groove 6 is provided on the outer wall of the lower rod 5c. A ball 7 is provided in the guide groove 6 to control the behavior of the output member 5 around the center line C.

[0017] A tapered section 8 is provided midway along the height of the rod main body 5a. Meanwhile, a hole 9 perpendicular to the center line C is drilled in the peripheral wall surface of the cylindrical hole 4. The position of the hole 9 is within the range in which the tapered section 8 moves when the rod main body 5a moves up and down. A ball 11 is fitted in the hole 9, and by riding on the tapered section 8, the vertical movement of the rod main body 5a is converted into movement perpendicular to the center line C (radial direction of the center line C).

[0018] The motion of the ball 11 is transmitted to the stand-alone power generating apparatus 100. The stand-alone power generating apparatus 100 converts the kinetic energy of the ball 11 into electrical energy, and supplies power to the wireless module 101 to drive it. The wireless module 101 wirelessly transmits a signal indicating that the ball has climbed over.

[0019] FIG. 2 shows an enlarged view of the periphery of the independent power generating apparatus 100. In FIG. 2A, the independent power generating apparatus 100 includes a magnet unit 13 fixed to the housing 2 with a bolt 23, and a coil unit 12 movable by the movement of a ball 11 in the radial direction of the center line C. The magnet unit 13 includes a permanent magnet 14 and an upper magnetic flux path 15 and a lower magnetic flux path 16 of a soft magnetic material. Magnetic flux paths of the soft magnetic material are provided for the upper and lower magnetic poles of the permanent magnet 14, respectively. The two magnetic flux paths 15, 16 are U-shaped in a side view, sandwiching the permanent magnet 14, and one magnetic flux path 15 is disposed on the inside and the other magnetic flux path 16 is disposed on the outside so as to overlap with a distance therebetween. The two ends of the magnetic flux path 15 are pole pieces 15a, 15b, and the two ends of the magnetic flux path 16 are pole pieces 16a, 16b.

[0020] The coil unit 12 has a core 17, a coil 19 wound around the outer periphery of the core 17 via a bobbin 19a, and ring-shaped slide pieces 21 and 22 sandwiching the coil 19. The pole pieces 15a and 16a face each other as a pair on the front side of the coil 19, and the pole pieces 15b and 16b face each other as a pair on the rear side of the coil 19. The core 17 has a front end 17a on the front side (right in the figure) of its length direction (core axis direction c1), a core body 17b in the center, and a rear end 17c on the rear side (left in the figure), and is cylindrical with the core axis direction c1 coinciding with the radial direction of the center line C. Hereinafter, in the drawings, the right side of the core axis direction c1 is referred to as the front side, and the left side is referred to as the rear side. The length of the core 17 in the core axis direction c1 is mostly the core body 17b, and the coil 19 is wound around the outer periphery of the core body 17b. Although it is not clear from the figure, the bobbin 19a is adhesively fixed to the magnetic flux path 15. The core body 17b and the coil 19 are not fixed, and the core body 17b can move in the core axis direction c1 via the hollow of the bobbin 19a, which is the center of the coil 19.

[0021] The core body 17b is made of a soft magnetic material. The front end portion 17a and the rear end portion 17c may be made of a soft magnetic material or a non-magnetic material. However, if they are made of a soft magnetic material, a gap must be provided between them so as not to magnetically short-circuit the upper and lower magnetic flux paths 15, 16.

[0022] The core body 17b and the front end 17a, and the core body 17b and the rear end 17c are provided with a convex portion a and a concave portion b so as to fit together. The outer peripheral surface between the core body 17b and the front end 17a, and between the core body 17b and the rear end 17c are provided with sliding surfaces 17d and 17e, which are smaller in diameter than the other outer peripheral surfaces at a distance d. The slide pieces 21 and 22 are soft magnetic and are fitted to the outer peripheral surfaces of the sliding surfaces 17d and 17e, respectively, and the slide pieces 21 and 22 can freely move on the sliding surfaces 17d and 17e in the core axis direction c1 within the range of the distance d. The large diameter portion of the core body 17b, the front end 17a, and the rear end 17c restrict the movement of the slide pieces 21 and 22 beyond the distance d. The two slide pieces 21, 22 are always in contact with the corresponding sliding surfaces 17d, 17e, and magnetic flux passes between the core body 17b and the slide pieces 21, 22 without a magnetic gap.

[0023] The front end 17a of the core 17 abuts against the ball 11, and when the radial motion of the center line C is transmitted from the ball 11 to the core 17, the core 17 moves in the core axis direction c1 relative to the magnet unit 13. The rear end 17c abuts against the elastic body 18, which is a compression spring, at the rear side. The elastic body 18 is housed in a spring chamber 24, and accumulates elastic force in the spring chamber 24 due to the core 17 moving in the core axis direction c1. The elastic force accumulated in the elastic body is used as a force pushing the core forward when the rod main body 5a descends and the ball 11 descends from the tapered portion 8.

[0024] FIG. 3 is a diagram for explaining the details of the coil unit 12 and the slide pieces 21, 22. In the figure, the coil 19 (and the bobbin 19a) are indicated by dashed lines. When the front end 17a and the rear end 17c of the core 17 are removed from the core body 17b, the slide pieces 21, 22 can be removed from the sliding surfaces 17d, 17e. The front end 17a has an input end p that contacts the ball 11, a first base q that is larger in diameter than the sliding surface 17d, and a recess b that fits with the protrusion a of the core body 17b. The rear end 17c has a seat r that contacts the elastic body 18, a second base s that is larger in diameter than the sliding surface 17e, and a recess b (FIG. 2) that fits with the protrusion a of the core body 17b. The slide pieces 21, 22 are cylindrical with a height h, and the height h is shorter than the distance d. Each of the slide pieces 21 and 22 has contact surfaces 21a and 21b and contact surfaces 22a and 22b on the front and back, respectively, which are perpendicular to the core axis direction c1.

[0025] FIG. 4 is a diagram showing the relationship between the magnet unit 13 and the core 17. The magnet unit 13 is fixed to the housing 2 by a bolt 23 with the permanent magnet 14 sandwiched between the upper and lower magnetic flux paths 15, 16. The upper and lower magnetic flux paths 15, 16 are made by bending a plate material into a U-shape. The pole pieces 15a, 15b, 16a, 16b, which are the ends of the upper and lower magnetic flux paths 15, 16, respectively, are arranged at intervals from the core body 17b, the front end 17a, and the rear end 17c. Moreover, this is to prevent the core body 17b, the front end 17a, and the rear end 17c from forming a magnetic flux path that does not come into contact with each other before, during, or after the core body 17b, the front end 17a, and the rear end 17c are pushed by the ball 11 or the elastic body 18 and move.

[0026] The magnetic poles of the permanent magnet 14 appear in the pole pieces 15a, 16b of the upper and lower magnetic flux paths 15, 16. The pole pieces 15a, 15b of the upper magnetic flux path 15 and the pole pieces 16a, 16b of the lower magnetic flux path are arranged in parallel with a distance t between them. The pole pieces 15a, 16a are capable of contacting the abutment surfaces 21b, 21a on the front and back of the sliding top 21, respectively. The pole pieces 15b, 16b are capable of contacting the abutment surfaces 22a, 22b on the front and back of the sliding top 22, respectively. The pole pieces 15a, 15b, 16a, 16b are provided with arc-shaped cutouts x to increase the contact area with the sliding tops 21, 22. When the ring cores 21 and 22 slide on the sliding surfaces 17d and 17e, the ring cores 21 and 22 come into contact with the pole pieces 15a, 15b, 16a and 16b and are prevented from sliding, so that the range in which the ring cores 21 and 22 can move is within this distance t.

[0027] FIG. 5 shows the operation of the stand-alone power generating apparatus 100. As shown in FIG. 5A shows the state before the ball 11 in FIG. 1 rides on the tapered portion 8. The rear pole piece 15b of the upper magnetic flux path 15, the sliding piece 22, the core body 17b, the sliding piece 21, and the front pole piece 16a of the lower magnetic flux path 16 are magnetically short-circuited to form a magnetic circuit φ1.

[0028] 5B shows the core 17 moving rearward in the direction of the core axis c1 while the ball 11 is in the process of climbing up onto the tapered portion 8. The sliding top 21 and the sliding top 22 are pushed by the front end 17a and the large-diameter portion of the core body 17b, respectively, and the rear pole piece 15b of the upper magnetic flux path 15 and the sliding top 22, and the sliding top 21 and the front pole piece 16a of the lower magnetic flux path 16 begin to separate, creating a gap g. The moving speed v1 at which the core 17 and the sliding tops 21 and 22 move is the moving speed of the ball 11. The magnetic force between the rear pole piece 15b of the upper magnetic flux path 15 and the sliding top 22, and the magnetic force between the sliding top 21 and the front pole piece 16a of the lower magnetic flux path 16 weaken.

[0029] In Fig. 5C, at the moment when the magnetic force between the pole piece 16b on the rear side of the lower magnetic flux path 15 and the slide piece 22, and the magnetic force between the slide piece 21 and the pole piece 15a on the front side of the upper magnetic flux path 15 become dominant, the slide pieces 21 and 22 leave the state of moving speed v1, are accelerated on the sliding surfaces 17d and 17e, and collide with the pole pieces 15a and 16b, respectively. Note that Fig. 5B and Fig. 5C show the state before and after the slide pieces 21 and 22 are suddenly accelerated and move, even though the core 17 has hardly moved at all.

[0030] As is clear from FIG. 5C, the distance d between the sliding surfaces 17d and 17e is designed so that the rear ends of the sliding surfaces 17d and 17e are moved to the position of the rear pole piece 16b of the lower magnetic flux path 16 and the position of the front pole piece 15a of the upper magnetic flux path 15, or beyond them. In this state, the front pole piece 15a of the upper magnetic flux path 15, the slide piece 21, the core body 17b, the slide piece 22, and the rear pole piece 16b of the lower magnetic flux path 16 are magnetically short-circuited to form a magnetic circuit φ2. Focusing on the core body 17b, the direction of the magnetic flux passing through the core body 17b is opposite between the magnetic circuit φ1 and the magnetic circuit φ2. The magnetic flux changes greatly due to the instantaneous change from the magnetic circuit φ1 to the magnetic circuit φ2.

[0031] Thereafter, the core 17 moves until the ball 11 climbs up the tapered portion 8 (FIG. 5D). When the ball 11 descends the tapered portion 8, the reverse process is carried out from FIG. 5D to FIG. 5A. At this time, it is the rear end portion 17c and the large diameter portion of the core body 17b that push the slide piece 22 and the slide piece 21 forward, respectively. The movement for reversing the magnetic flux of the core body 17b is the same, so a description thereof will be omitted.

[0032] FIG. 6 is an explanatory diagram for evaluating the performance of the independent power generating device 100. FIG. 6A shows a test circuit 200 used for evaluation. FIG. 6B shows the electromotive force of an independent power generating device (as a comparative example) in which the sliding pieces 21 and 22 are fixed to the core body 17b. The independent power generating device in which the sliding piece is fixed to the core body is an independent power generating device in which the sliding piece is fixed to the sliding surface of the core body in FIG. 1 and cannot move independently of the core body. FIG. 6C shows the results of evaluating the independent power generating device 100 in which the sliding piece can move independently of the core body, as described in the above embodiment.

[0033] In the comparative example of Fig. 6B, the peak of the electromotive force is at about 10 msec (0.01 sec), while in the stand-alone power generating device 100 of Fig. 6C, the peak is at about 4 msec (0.004 sec), and Fig. 6C has a faster response speed. It can also be observed that the electromotive force increases from about 2 V to about 8 V.

[0034] In the comparative example of Fig. 6B, the magnetic force from the pole pieces 15a and 16b attracts the core 17, but the mass of the core as a whole is large, and it is not possible to accelerate significantly from the moving speed of the ball 11, resulting in a slow response speed. On the other hand, in the independent power generating device 100 of Fig. 6C, the mass of the sliding tops 21 and 22 moving on the sliding surfaces 17d and 17e is very small compared to the entire core 17, and the acceleration is large, so the change in the magnetic flux passing through the coil 19 (passing through the core body 17b) is large, and the electromotive force increases. In addition, the sliding tops 21 and 22 are not affected by the elastic force from the elastic body 18 to the front side in the axial direction of the core, which also contributes to the increase in acceleration.

[0035] As described above, according to this embodiment, the linear motion of the ball 11 can be directly used for the movement of the core body 17b. In addition, the mass of the sliding pieces 21 and 22 is very small compared to the core 17, so the acceleration can be increased, and the response speed is fast. Increasing the response speed also has the effect of increasing the change in the magnetic flux passing through the coil 19, and increasing the electromotive force. In addition, the magnetic circuits φ1 and φ2 are closed looped using the two sliding pieces 21 and 22, so the magnetic flux passing through the coil 19 can be increased.

[0036] In the above embodiment, the force of the elastic body 18 is used to push the core 17 forward, but instead of the force of the elastic body 18, the pressure of pressure oil or compressed air may be used. FIG. 7 shows this modification as another embodiment. The spring chamber 24 to which the elastic body 18 is attached is changed to an operating chamber 25 to which pressure oil or compressed air is supplied, and the rear end portion 17c is changed to a piston 27. The piston 27 is moved forward in the c1 direction by the pressure of the pressure oil or compressed air supplied to the operating chamber, pushing the core body 17b. In this case, the pressure oil or compressed air supplied to the operating chamber 25 may be supplied from the chamber 3a above the piston 5b in the cylinder bore 3 through the flow path 26. As a result, when pressure oil or compressed air is supplied to the chamber 3a, it is also supplied to the operating chamber 25 from the chamber 3a through the flow path 26. Therefore, at the timing when it is desired to operate the core body 17b forward of the core axis c1, pressure oil, compressed air, etc. is supplied to the operating chamber 25, and the pressure oil, compressed air, etc. can accurately operate the core body 17b. [Explanation of symbols]

[0037] 1 Clamping device 2. Housing 2a Ceiling section 2b bottom 2c trunk wall 3 Cylinder hole Room 3a 4 cylinder hole 5 Output member 5a Rod body 5b Piston part 5c Lower Rod 6 Guide groove 7. Ball 8 Tapered section 9 holes 11. Ball 12 Coil unit 13 Magnet unit 14 Permanent magnets 15, 16 Magnetic flux path 15a, 15b, 16a, 16b pole pieces 17 cores 17a Front end 17b Core body 17c Rear end 17d, 17e sliding surface 18 Elastic Body 19 Coil 19a Bobbin 21, 22 Slide frames 21a, 21b, 22a, 22b contact surface 23 Volts 24 Spring chamber 25 Working chamber 26 Flow Path 27 Piston 100 Standalone power generation device 101 Wireless Module 200 Test Circuit C center line a Convex part b Concave c1 Core axis direction d Distance g gap p input end r Pedestal t interval v1 movement speed x Cutout φ1 magnetic circuit φ2 magnetic circuit

Claims

1. a coil unit in which a coil is wound around an outer periphery of a core body whose length direction is the core axis direction, sliding surfaces having a predetermined distance in the core axis direction are provided on the front and rear sides of the outer periphery of the core body to sandwich the coil, and the coil unit has front and rear slide pieces that slide on the front and rear sliding surfaces, respectively; a magnetic flux passage having a U-shape in a side view of a soft magnetic body provided for each of the upper and lower magnetic poles of a permanent magnet, the magnetic flux passages overlap with a distance between them, one on the inside and the other on the outside, with the permanent magnet sandwiched between them, and the pole pieces at both ends of the magnetic flux passages face each other to form a pair, and magnet units are provided at the front and rear of the coil, The front pair of pole pieces are arranged to sandwich a front slide piece in the core axis direction, and the rear pair of pole pieces are arranged to sandwich a rear slide piece in the core axis direction, When the core body is in a first position on the front side, the front slide piece is in contact with the front pole piece of the pair of front pole pieces, and the front slide piece is in contact with the front pole piece of the pair of rear pole pieces, When the core body is in the second position on the rear side, the front slide piece is in contact with the rear pole piece of the pair of front pole pieces, and the rear slide piece is in contact with the rear pole piece of the pair of rear pole pieces, An independent power generating device characterized in that, during the process in which the core body moves from the first position to the second position, the two sliding pieces move on the sliding surfaces due to magnetic force from the pole pieces.

2. 2. The independent power generation device of claim 1, wherein an elastic body is arranged on the rear side of the core body, and a resilient force that moves the core body forward is accumulated in the elastic body during the process of the core body moving from the first position to the second position.

3. 2. The independent power generating device of claim 1, wherein the coil has a fixed relative position to the magnet unit, and the core body is movable from the first position to the second position via the coil center of the coil.

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