JP2017147937A - Electromagnetic generator and linear actuator device mounting the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an electromagnetic generator and linear actuator device mounting the electromagnetic generator that make it unnecessary to lay a power supply line for supplying power when an apparatus requiring power supply is mounted on the linear actuator side to solve the disconnection problem of the power supply line, and further make it possible to make replacement of a battery be unnecessary.SOLUTION: An electromagnetic generator 100 comprises: a magnetic coil 7 that is fixed on an air cylinder main body 2 and is wound around an insulation bobbin 6; a movable magnet rod 11 having a magnet 12 disposed near its one end 11a; and a connection member 5 that connects the other end 11b with a tip 4a of an air cylinder movable rod 4. The electromagnetic generator is configured so that the movable magnet rod 11 performs reciprocation in a hollow part of the insulation bobbin 6 correspondingly to reciprocation motion of the air cylinder movable rod 4. In this case, the magnet 12 bidirectionally passes inside the magnetic coil 7, making the magnetic coil 7 be interlinked with a magnetic field (magnetic flux) caused by the magnet 12 to generate induction electromotive force in the magnetic coil 7.SELECTED DRAWING: Figure 1

Description

  The present invention relates to, for example, an electromagnetic generator mounted on a direct-acting motion engine that acts on a workpiece and a direct-acting actuator device equipped with the electromagnetic generator, and more specifically, according to the operation of the direct-acting motion engine. The present invention relates to an electromagnetic generator for generating electric power and a linear motion actuator device equipped with the electromagnetic generator.

  For example, a spot welding apparatus described in Patent Document 1 below is known as an apparatus using a linear actuator. Hereinafter, the linear actuator device will be described using a spot welding device.

  That is, in the spot welding apparatus 360 shown in FIG. 4, the position sensors 316 and 317 are attached to the air cylinder 331, and piston position information of the air cylinder 331 is transmitted to the control apparatus 381. A command is transmitted to each control part, and operation of each member is controlled. At this time, transmission of signals from the position sensors 316 and 317 to the control device 381 is generally performed via signal lines.

However, in the signal line between the position sensors 316 and 317 and the control device 381, the same part is bent following the expansion and contraction of the piston (rod) 327 with respect to the air cylinder 331. There was a problem that fatigue was easily generated and disconnection was easily caused.
Therefore, a system is adopted in which communication between the position sensors 316 and 317 and the control device 381 is wireless instead of wired.

  FIG. 4 shows a member (workpiece) 420 to be welded that is spot welded by a welding robot 311 and a spot welding apparatus 360. In the spot welding apparatus 360, a welding operation is performed with the workpiece 420 held between the fixed side electrode 374a and the movable side electrode 378a. The movable electrode 378a is provided at the tip of the rod 327, and when the rod 327 is lowered by driving the pressure actuator 325, the work 420 is sandwiched between the movable electrode 378a and the fixed electrode 374a.

  At that time, the cylinder rod 322 is movable from the air cylinder 331 so as to be extendable and contracted, and a region close to the welded portion is pressed by holding plates 372 and 376 attached to the cylinder rod 322. Thereby, the spot welding to a desired part can be performed favorably.

JP 2013-144316 A

However, in the above-described apparatus, when a transmitter for wirelessly transmitting the signals from the position sensors 316 and 317 is provided on the cylinder side, a power supply line for supplying power from an external commercial power source for driving the transmitter Becomes difficult to break, which is a problem as in the case of the signal lines.
Although a method of using a battery instead of the external commercial power supply is also conceivable, it is not easy to be forced to replace it every time the battery runs out.
The present invention has been made in view of the above circumstances, and when a device that requires power supply is mounted on the linear actuator side, it is not necessary to install a power supply line for supplying power, and the power supply line disconnection problem is eliminated. It is an object of the present invention to provide an electromagnetic generator that can solve the problem and further eliminates the need for battery replacement, and a linear motion actuator device equipped with the electromagnetic generator.

The electromagnetic generator of the present invention is
In conjunction with the expansion / contraction operation of the piston of the direct acting actuator for acting on the workpiece, a rod arranged in a predetermined position that can move in the expansion / contraction direction of the piston,
A magnetic coil wound around a hollow bobbin,
The magnetic coil is configured to generate an induced electromotive force in the magnetic coil by interlinking with the magnetic flux by the magnet as the rod passes through the hollow through hole of the bobbin and moves in the expansion / contraction direction. It is characterized by that.
Further, in this electromagnetic generator, the arrangement position of the magnet and the arrangement position of the magnetic coil in the rod are the magnetic flux generated by the magnetic coil and the magnet when the magnet passes through the magnetic coil. It is preferable that the number of interlinkages per unit time is such that the maximum number of interlinkages is.

Moreover, it is preferable that the said magnetic coil is distribute | arranged to the position where the moving speed of the said magnet distribute | arranged to the predetermined position of the said rod becomes the maximum.
Moreover, it is preferable that the said magnetic coil is located in the center part of the movable range of the said magnet.
The linear motion actuator is a linear cylinder,
The total length of the rod is set longer than the movable length of the piston of the linear cylinder;
The predetermined position where the magnet is arranged is near one end of the rod, while the other end of the rod is connected to the piston of the linear cylinder by a connecting member,
It is preferable that a sensor unit for detecting whether or not a specific position of the piston has passed is provided in the vicinity of the linear cylinder.

Moreover, it is preferable that at least the magnetic coil and the generator-related circuit element are housed in a case having magnetic shielding properties. Here, the “generator-related circuit element” refers to various elements constituting the circuit in a control circuit, a drive circuit, and the like of the generator.
Moreover, it is preferable that the hole part by which the said rod is inserted is provided in the at least one side surface located in the moving direction of the said rod of the said magnetic shielding case.

A rectifier circuit for rectifying the output signal of the magnetic coil;
A capacitor for accumulating output power from the rectifier circuit,
It is preferable to provide.
In addition, it is preferable that the magnetic coil is composed of a unit coil group including a plurality of unit coils connected in series with each other, and adjacent unit coils are wound in opposite directions.

Moreover, it is preferable that the said magnetic coil consists of a plurality of said unit coil groups, and the said adjacent unit coil groups are electrically connected.
Preferably, each of the plurality of unit coil groups is provided with a rectifier circuit, and the outputs of these rectifier circuits are added to each other.

The magnet is preferably composed of a plurality of unit magnets arranged in a line, and the adjacent unit magnets are arranged so that the same poles face each other.
Moreover, it is preferable that the magnetizing direction of the magnet is parallel to the moving direction of the rod.

Furthermore, the linear actuator device equipped with the electromagnetic generator of the present invention is
A linear actuator for acting on the workpiece;
In conjunction with the expansion / contraction operation of the piston of the linear actuator, a rod that is movable in the expansion / contraction direction of the piston and has a magnet arranged at a predetermined position;
A magnetic coil wound around a hollow bobbin,
The magnetic coil is configured to generate an induced current in the magnetic coil by interlinking with the magnetic flux by the magnet as the rod passes through the hollow through hole of the bobbin and moves in the expansion / contraction direction. It is characterized by that.
In the linear actuator device, the arrangement position of the magnet and the arrangement position of the magnetic coil in the rod are determined by the magnetic coil and the magnet when the magnet passes through the magnetic coil. It is preferable that the number of linkages per unit time with the magnetic flux is maximized.

  According to the electromagnetic generator and the direct acting actuator device of the present invention, in conjunction with the expansion and contraction operation of the piston of the direct acting actuator, the magnet reciprocates the rod arranged at a predetermined position and is wound around the hollow bobbin. By passing through the magnetic coil, the magnetic coil is interlinked with the magnetic flux by the magnet, and the number of the interlinked magnetic fluxes changes to generate an induced current in the magnetic coil. As a result, the driving power can be supplied to the transmitter arranged near the linear actuator.

Further, since the length of the rod is set to be longer than the movable length of the piston, a member that holds one end of the rod when the other end is connected to the other end of the piston. Can be prevented from coming off.
Furthermore, the arrangement position of the magnet in the rod and the arrangement position of the magnetic coil wound around the bobbin are the chain per unit time between the magnetic coil and the magnetic flux generated by the magnet when the magnet passes through the magnetic coil. Since the relative positional relationship is such that the number of commutations is maximized, the induced electromotive force can be generated efficiently, and the transmitter can be driven with higher power.

It is a schematic diagram which shows the structure ((A) is a piston contraction state, (B) is a piston expansion | extension state) of the electromagnetic generator which concerns on embodiment of this invention. In this embodiment, (A) is a graph showing the magnetic flux density distribution of the magnet, (B) is a graph showing the speed change pattern of the movable magnet rod (magnet), and (C) is a non-magnetic pipe-like shape in this embodiment. It is a schematic diagram which shows the arrangement | positioning position of the magnetic coil with respect to a guide. It is a graph which shows the speed change pattern of a movable magnet rod (magnet) different from FIG. 2 (B). It is a schematic diagram which shows the spot welding apparatus as an application example in which the electromagnetic generator of this embodiment is mounted.

  Hereinafter, the electromagnetic generator 100 which concerns on embodiment of this invention is demonstrated using FIG. Here, FIG. 1A shows a state in which the air cylinder movable rod (piston) 4 is housed in the air cylinder body 2 (contracted state), and FIG. 1B shows that the air cylinder movable rod (piston) 4 is in the air cylinder body. 2 shows a state expanded from 2 (expanded state).

The electromagnetic generator 100 according to this embodiment is mounted on a linear motion actuator device 1 as shown in FIG.
That is, as the linear motion actuator device 1, a welding device as described above, a molded product take-out device used when a molded product manufactured by an injection molding machine is taken out from a mold, and the like,
The present invention can be applied to various devices that act on a workpiece or the like using a linearly acting actuator. In the present embodiment, a case where the electromagnetic generator 100 is mounted on a general-purpose air cylinder 200 will be described.

  As shown in FIGS. 1A and 1B, the air cylinder 200 includes an air cylinder body 2 and an air cylinder movable rod 4, and the air cylinder body 2 is connected to the first air introduction port 3a and the second air introduction port 3b. The air cylinder movable rod 4 is expanded and contracted by introducing air from an air supply source (341 in FIG. 4) into an unillustrated expansion side air chamber or contraction side air chamber. Thus, when the air cylinder movable rod 4 is extended, its tip portion 4a is made to act on the workpiece.

The electromagnetic generator 100 mounted on the air cylinder 200 includes a magnetic coil 7 fixed to the air cylinder body 2 and wound around an insulating bobbin 6, and a magnet (permanent magnet) slightly inside the one end portion 11a. (E.g., a neodymium magnet)) 12 is provided, and a connecting member 5 that connects the other end portion 11b of the movable magnet rod 11 to the tip portion 4a of the air cylinder movable rod 4 is provided. The movable magnet rod 11 is configured to reciprocate in the hollow portion of the insulating bobbin 6 in accordance with the reciprocating motion of the air cylinder movable rod 4. At this time, since the magnet 12 passes through the inside of the magnetic coil 7 in both directions, the magnetic coil 7 is linked with the changing magnetic field (magnetic flux) by the magnet 12 so that an induced electromotive force is generated in the magnetic coil 7. It is configured.
The induced current output according to the induced electromotive force generated in this way is rectified by a rectifier circuit (not shown) and stored in a capacitor (not shown).

  In addition, the electric power accumulated in the capacitor in this way is supplied to, for example, a transmitter that wirelessly transmits information from the sensors (316, 317) in the welding apparatus using FIG. As a result, there is no need to route the power line from the outside, and no complicated battery replacement is required as in the case where a battery is used as the power source.

Hereinafter, the configuration and operation of the electromagnetic generator 100 described above will be described in more detail.
As described above, one end 11a of the movable magnet rod 11 is provided with a short non-magnetic guide portion 13, and three magnet elements (unit magnets) are connected in series on the other end 11b of the rod. An arranged magnet 12 is provided. As described above, since the magnet 12 includes the plurality of magnet elements 12a, 12b, and 12c, the power generation efficiency can be increased.
Moreover, the other area | region of the movable magnet rod 11 is comprised from the nonmagnetic member. For example, the magnet 12 is fitted into a predetermined position of a rod made of the same nonmagnetic material as a whole so that the rod surface and the magnet surface are flush with each other.
The movable magnet rod 11 is fixed to the connecting member 5 with a screw at the end face of the other end portion 11b.

  Further, as shown in FIG. 2, the magnet elements 12a, 12b, and 12c are arranged so that the adjacent magnet elements 12a, 12b, and 12c face each other with the same poles. Due to the magnet structure facing the same pole, a magnetic flux that changes so as to rise or fall sharply is generated in the vicinity of each end face of each of the magnet elements 12a, 12b, and 12c. Then, since these magnetic fluxes change so as to pass through the magnetic coil 7 and move across the wire of the magnetic coil 7 with the movement of the movable magnet rod 11, an induced current is generated in the magnetic coil 7. In addition, the change of magnetic flux density (PHI) near each end surface of the magnet elements 12a, 12b, and 12c facing the same pole has a shape as shown in FIG. In particular, the change in the direction of the magnetic flux between the magnet elements 12a and 12b is opposite to the change in the direction of the magnetic flux between the magnet elements 12b and 12c, and when the former changes from positive to negative, Expressed as changing from negative to positive.

Also, in order to generate a magnetic flux that changes steeply up or down in the vicinity of each end face of the magnet elements 12a, 12b, and 12c, nothing is sandwiched between the magnet elements 12a, 12b, and 12c. It is effective to arrange the end faces so that they are in direct contact with each other. In this case, a means for suppressing the repulsive force between the same poles and connecting the magnet elements 12a, 12b, 12c is required.
In the modified embodiment of the present embodiment, the magnet elements 12a, 12b, and 12c are each formed in a ring shape, connected like a skewer along the axial direction of the movable magnet rod 11, and located at the left end and the right end thereof. The left end surface of the magnet element 12a and the right end surface of the magnet element 12c are disposed so as to be physically sandwiched and fixed by the movable magnet rod 11 and the nonmagnetic guide 13, respectively.
The magnetizing directions of the magnet elements 12a, 12b, and 12c are parallel to the axial direction of the movable magnet rod 11, that is, the axial direction of the air cylinder movable rod 4.

Next, the magnetic coil 7 wound around the insulating bobbin 6 will be described.
The magnetic coil 7 is composed of a unit coil group composed of a plurality of coil elements 7a, 7b, 7c connected in series with each other, and the adjacent coil elements 7a, 7b, 7c are opposite to each other in the coil winding direction. And are set so as to have opposite polarities alternately. That is, the winding direction of each coil element 7a, 7b, 7c is set to be opposite to each other in the forward, reverse, forward direction for each adjacent coil element 7a, 7b, 7c. A large electromotive force is generated.

Further, the magnetic coil 7 may be composed of a plurality of unit coil groups, and adjacent unit coil groups may be electrically connected.
Further, a rectifier circuit may be provided in each of the plurality of unit coil groups, and the outputs of these rectifier circuits may be added to each other.

  As shown in FIGS. 1A and 1B, a magnetic coil 7 in which this coil is wound around an insulating bobbin 6 is embedded in a hollow non-magnetic pipe-shaped guide 14 by molding or the like. Further, the hollow portion of the insulating bobbin 6 and the hollow portion of the non-magnetic pipe-shaped guide 14 are arranged so as to spatially coincide with each other by an integral molding method, a fitting processing method, or the like.

That is, the inner diameter dimension of the hollow portion of the nonmagnetic pipe-shaped guide 14 and the outer diameter dimension of the air cylinder movable rod 4 are adjusted so that the nonmagnetic pipe-shaped guide 14 and the movable magnet rod 11 can slide smoothly with each other. It is formed to be.
When the movable magnet rod 11 moves through the hollow portion of the insulating bobbin 6 (and the nonmagnetic pipe-shaped guide 14), the movable magnet rod 11 and the inner wall surface of the insulating bobbin 6 (and the nonmagnetic pipe-shaped guide 14) If the number of contact points and the number of collisions increase, the driving force of the movable magnet rod 11, and hence the air cylinder movable rod 4, will decrease, so that the insulating bobbin 6 (and the nonmagnetic pipe-shaped guide 14) and the movable magnet rod 11 It is desirable that at least one or both be formed of a material having a low coefficient of friction, such as polypropylene or polyacetal. By using such a material, it is possible to significantly reduce the friction between the insulating bobbin 6 (and the non-magnetic pipe-shaped guide 14) and the movable magnet rod 11 during relative movement.

Further, the nonmagnetic pipe-shaped guide 14 is fixed to the air cylinder main body 2 by a process such as adhesion or sticking directly or indirectly to the side wall portion of the air cylinder main body 2.
Further, the total length of the nonmagnetic pipe-shaped guide 14 is set to be longer than the movable length of the air cylinder movable rod 4, and consideration is given so that the movable magnet rod 11 does not come off from the nonmagnetic pipe-shaped guide 14. Yes.

  Thus, when the movable magnet rod 11 reciprocates in the axial direction according to the expansion and contraction of the air cylinder movable rod 4, the movable magnet rod 11 moves so as to slide on the nonmagnetic pipe-shaped guide 14, and the magnet 12. Passes bidirectionally through the hollow portion of the magnetic coil 7 (insulating bobbin 6). As a result, the magnetic flux generated by the magnet 12 and the magnetic coil 7 are linked, and the number of linkages per unit time changes as the movable magnet rod 11 reciprocates in the axial direction. An induced electromotive force is generated in the coil 7 and an induced current flows.

  By the way, the induced electromotive force generated in the magnetic coil 7 increases as the change in density of the magnetic flux by the magnet 12 increases.

That is, the magnitude of the electromotive force e generated in the one-turn magnetic coil 7 is represented by the following formula (1) from Faraday's law of electromagnetic induction, where Φ [Wb] is the magnetic flux and t [s] is the time , And the amount of change per 1 s of the magnetic flux Φ and the number of turns n of the magnetic coil 7 (the induced electromotive force is proportional to the number of turns n).
e = −n · dΦ / dt [V] (1)

  By the way, the magnetic flux density formed by the magnet 12 has a distribution as shown in FIG. Here, the distribution of the magnetic flux density Φ of the magnet 12 shown in FIG. 2A indicates a static distribution when the magnet 12 is stationary at the center of the movable range. Further, as the air cylinder movable rod 4 expands and contracts, the static magnetic flux density distribution moves in the horizontal direction of the paper in FIG. The change in the moving speed of the magnetic flux density distribution is shown in FIG.

  As described above, since the magnetic flux density having the distribution shown in FIG. 2A reciprocates over a wide range in the axial direction of the movable magnet rod 11, each coil element 7a, 7b of the magnetic coil 7 is eventually obtained. 7c, the magnitude of the absolute value of dΦ / dt described above depends on the speed of the movable magnet rod 11 (speed at which the magnet 12 moves) v (t).

  The speed of the reciprocating movable magnet rod 11 (the speed at which the magnet 12 moves) is such that the air cylinder movable rod 4 is most contracted (FIG. 1 (A)) and the air cylinder movable rod 4 is most expanded. It becomes 0 in (FIG. 1 (B)), and it is comprised so that it may become the largest in the predetermined position between both, and a moving speed changes according to the expansion-contraction state of the movable magnet rod 11. FIG.

The inventor of the present application obtained the relative positional relationship between the magnet 12 and the magnetic coil 7 at which the speed of the movable magnet rod 11 is maximized by simulation. For example, as shown in FIG. 7 is set to be arranged near the center of the movable range of the magnet 12 (the position where the horizontal axis is 0.5) (the distance from the center position of the magnet 12 during contraction and the magnet 12 during expansion). (The distance from the center position of each is equal to S).
That is, it has become clear that it is desirable to arrange the magnetic coil 7 near the center of the movable range of the magnet 12 where the speed of the movable magnet rod 11 is maximized.

In addition, by arranging the magnetic coil 7 near the center of the movable range of the magnet 12, the amount of power generated by the electromagnetic generator 100 is the same whether the movable magnet rod 11 is extended or contracted. This can contribute to stable operation of peripheral circuits and sensors. Here, “near the central portion” means “a magnet-corresponding position when the magnet 12 is moving at the same speed as in the central position”. For example, the magnet has its maximum speed value. It shall mean an arrangement position range of the magnetic coil 7 that moves at a speed of 90% or more.
However, when the movement of the air cylinder movable rod 4 reaches a maximum speed at a position (for example, position P in FIG. 3) that is not the central portion of the contracted state position and the extended state position, the speed is maximum. The magnetic coil 7 is disposed at a position (for example, position P in FIG. 3).

  In addition, the magnetic coil 7 combines the induced electromotive forces in the plurality of coil elements 7a, 7b, and 7c with the voltage phases synchronized with each other, so that the electromagnetic generator 100 can transmit the above-described sensor signal transmitter or the like. The output current can be increased.

Although not shown, it is preferable that the magnetic coil 7, the insulating bobbin 6, the non-magnetic pipe-shaped guide 14, and the peripheral circuit components of the electromagnetic generator 100 are housed in a case having magnetic shielding properties.
Moreover, it is preferable to arrange | position the cover member (movable magnet rod support member) which provided the through-hole part which slide-supports the movable magnet rod 11 at the both end surfaces of the case which has the said magnetic shielding property, respectively. In this case, since the non-magnetic pipe-shaped guide 14 can be made unnecessary, the manufacturing cost can be reduced.

  In order to increase the amount of generated power, a method of increasing the number of coil elements in the magnetic coil 7 described above can be considered. However, the DC resistance of the coil increases in proportion to the number of coil turns, and the voltage drop increases. Therefore, if the number of coil turns is increased too much, electric power cannot be obtained efficiently. Therefore, from such a viewpoint, it is important to appropriately determine an efficient number of coil turns. Moreover, it is important to determine the number of magnet elements constituting the magnet 12 as appropriate from the viewpoint that the generated power can be efficiently obtained.

  Further, the nonmagnetic pipe-shaped guide 14 may have a closed pipe shape or an open pipe shape at the end opposite to the side where the movable magnet rod 11 is inserted. Good. If it is made into the closed pipe shape, it can prevent that dust etc. penetrate | invade into the hollow part of the nonmagnetic pipe-shaped guide 14. FIG.

Note that the electromagnetic generator of the present invention and the linear motion actuator device on which the electromagnetic generator is mounted are not limited to those of the above-described embodiment, and various other modes can be adopted.
For example, in the above-described embodiment, the air cylinder movable rod and the movable magnet rod are coupled by a coupling member that is integrated with each other and are moved in the same direction, but are coupled using another coupling member such as a gear. Alternatively, the moving direction of the movable magnet rod may not coincide with the moving direction of the air cylinder movable rod.

DESCRIPTION OF SYMBOLS 1 Linear motion actuator apparatus 2 Air cylinder main body 3a 1st air introduction port 3b 2nd air introduction port 4 Air cylinder movable rod 4a Tip part 5 Connection member 6 Insulating bobbin 7 Magnetic coil 7a, 7b, 7c Coil element 11 Movable magnet rod 11a One end 11b Other end 12 Magnet 12a, 12b, 12c Magnet element 14 Nonmagnetic pipe-shaped guide 100 Electromagnetic generator 200 Air cylinder 316, 317 Sensor

Claims (15)

In conjunction with the expansion / contraction operation of the piston of the direct acting actuator for acting on the workpiece, a rod arranged in a predetermined position that can move in the expansion / contraction direction of the piston,
A magnetic coil wound around a hollow bobbin,
The magnetic coil is configured to generate an induced electromotive force in the magnetic coil by interlinking with the magnetic flux by the magnet as the rod passes through the hollow through hole of the bobbin and moves in the expansion / contraction direction. An electromagnetic generator characterized by that.   The arrangement position of the magnet and the arrangement position of the magnetic coil in the rod are the linkage per unit time between the magnetic coil and the magnetic flux generated by the magnet when the magnet passes through the magnetic coil. The electromagnetic generator according to claim 1, wherein the positional relationship is maximized.   The electromagnetic generator according to claim 1, wherein the magnetic coil is disposed at a position where a moving speed of the magnet disposed at a predetermined position of the rod is maximized.   The electromagnetic generator according to any one of claims 1 to 3, wherein the magnetic coil is located in a central portion of a movable range of the magnet. The linear actuator comprises a linear cylinder;
The total length of the rod is set longer than the movable length of the piston of the linear cylinder;
The predetermined position where the magnet is arranged is near one end of the rod, while the other end of the rod is connected to the piston of the linear cylinder by a connecting member,
The electromagnetic generator according to any one of claims 1 to 4, wherein a sensor unit that detects whether or not a specific position of the piston has passed is provided in the vicinity of the linear cylinder. .   The electromagnetic generator according to claim 1, wherein at least the magnetic coil and the generator-related circuit element are housed in a case having magnetic shielding properties.   The electromagnetic generator according to claim 6, wherein a hole portion into which the rod is fitted is provided on at least one side surface of the case having magnetic shielding properties positioned in the moving direction of the rod. A rectifier circuit for rectifying the output signal of the magnetic coil;
A capacitor for accumulating output power from the rectifier circuit,
The electromagnetic generator according to claim 1, wherein the electromagnetic generator is provided.   The magnetic coil is composed of a unit coil group composed of a plurality of unit coils connected in series with each other, and adjacent unit coils have their coil winding directions opposite to each other. Item 9. The electromagnetic generator according to any one of Items 1 to 8.   The electromagnetic generator according to claim 9, wherein the magnetic coil includes a plurality of unit coil groups, and the adjacent unit coil groups are electrically connected to each other.   The electromagnetic generator according to claim 10, wherein a rectifier circuit is provided in each of the plurality of unit coil groups, and outputs of the rectifier circuits are added to each other.   12. The magnet according to claim 1, wherein the magnet includes a plurality of unit magnets arranged in a line, and the adjacent unit magnets are arranged so that the same poles face each other. The electromagnetic generator of Claim 1.   The electromagnetic generator according to claim 12, wherein a magnetizing direction of the magnet is parallel to a moving direction of the rod. A linear actuator for acting on the workpiece;
In conjunction with the expansion / contraction operation of the piston of the linear actuator, a rod that is movable in the expansion / contraction direction of the piston and has a magnet arranged at a predetermined position;
A magnetic coil wound around a hollow bobbin,
The magnetic coil is configured to generate an induced current in the magnetic coil by interlinking with the magnetic flux by the magnet as the rod passes through the hollow through hole of the bobbin and moves in the expansion / contraction direction. A linear motion actuator device equipped with an electromagnetic generator.   The arrangement position of the magnet and the arrangement position of the magnetic coil in the rod are the linkage per unit time between the magnetic coil and the magnetic flux generated by the magnet when the magnet passes through the magnetic coil. The direct acting actuator device equipped with the electromagnetic generator according to claim 14, wherein the positional relationship is such that the number is maximum.

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