JP2009240061A - Superconducting actuator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To sustain levitation stably even if an actuator is rotated by vibration of a secondary coil in an actuator which levitates a secondary coil by a magnetic repulsive force induced in the secondary coil by energizing a primary coil. <P>SOLUTION: In a superconducting actuator comprising a primary coil connected with a power supply, and a secondary coil for levitation which forms a closed circuit by connecting the opposite ends of a superconducting wire, generating magnetic flux which repels a magnetic flux generated in energizing the primary coil in the secondary coil and levitating the secondary coil by repellence of magnetic flux, the secondary coil consists of first through third coils which are fitted and coupled together in the directions of X axis, Y axis and Z axis passing through an identical central point, the primary coil includes the outside diameter equal to 1.2-100 times that of the secondary coil, and a repellent magnetic flux is generated so that the central axis of one coil in the secondary coil includes the same direction as that of the primary coil, thus holding levitation of the secondary coil. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a superconducting actuator, and more particularly, to an actuator for magnetic levitation using a superconducting coil.

As this type of superconducting actuator, the present applicant provides Japanese Patent Application Laid-Open No. 2007-60851 (Patent Document 1).
The superconducting actuator of Patent Document 1 is suitably used for teaching materials and demonstrations that allow observation of the ascent principle, and has the configuration shown in FIG.
That is, the primary coil 1 connected to the power source and the secondary coil 2 for levitation, which is a closed circuit by connecting both ends of the superconducting wire, are arranged opposite to each other so that the axial direction coincides, and when the primary coil 1 is energized The configuration in which the magnetic flux F1 generated in the primary coil and the repulsive magnetic flux F2 are generated in the secondary coil 2, and the secondary coil 2 is levitated by the repulsive force between the magnetic flux F1 of the primary coil 1 and the magnetic flux F2 of the secondary coil. It is said.
The primary coil 1 and the secondary coil 2 are fitted on the guide shaft 3 and the inner and outer circumferences of the secondary coil 2 are guided by the four connecting rods 4 so that the center of the secondary coil 2 that floats. The axis is held so as to coincide with the central axis of the primary coil 1.

JP 2007-60851 A

  As shown in FIG. 10, when the inner periphery of the secondary coil 2 serving as a levitation coil is restricted by the guide shaft 3, the outer periphery is restricted by the connecting rod 4, and the secondary coil 2 itself is disposed so as not to rotate, Magnetic flux generated in the primary coil 1 by matching the central axis of the secondary coil 2 with the central axis of the primary coil 1 and holding the secondary coil 2 and the end faces 2a and 1a in the direction perpendicular to the axis of the primary coil 1 in parallel. Can be generated in the secondary coil 2, and the secondary coil 2 can be stably levitated along the central axis.

However, if the secondary coil is levitated without these guide means when the secondary coil is levitated with the inner and outer circumferences of the secondary coil held by the guide means, the levitation principle of the secondary coil becomes clearer. It can be shown and attracts interest when used as a learning or demonstration material.
In addition, there are many cases in which guide means for regulating the inner and outer circumferences of the secondary coil cannot be provided for industrial use other than learning and demonstration materials. In addition, when the secondary coil is levitated without providing these guide means, a levitating object is attached to the levitating secondary coil, and the secondary coil is stably levitated, the use of the superconducting actuator Can be spread.

  On the other hand, when the secondary coil that is the levitation coil is not provided with guide means arranged on the inner and outer circumferences, the rotation of the levitation secondary coil cannot be regulated, and the secondary coil rotates when vibration or the like is applied. In this case, the direction of the magnetic flux generated in the primary coil and the direction of the magnetic repulsion generated in the secondary coil do not coincide with each other, and the repulsive force for levitating the secondary coil is weakened, and the secondary coil is stably levitated. I can't. For example, when the secondary coil rotates 90 degrees, the axial direction of the secondary coil becomes a direction orthogonal to the axial direction of the primary coil, the repulsive force of the magnetic flux is not generated, and the secondary coil falls.

  The present invention has been made in view of the above problems, and when the secondary coil is levitated without providing a guide means for restricting rotation, even if the secondary coil rotates due to vibration or the like, the secondary coil It is an object to generate a magnetic flux in the opposite direction to the magnetic flux of the primary coil to levitate the secondary coil in a stable state.

In order to solve the above-mentioned problems, the present invention comprises a primary coil connected to a power source and held in a predetermined position, and a levitation secondary coil connecting both ends of a superconducting wire to form a closed circuit, A superconducting actuator that, when energized to the coil, generates a magnetic flux repelling the magnetic flux generated in the primary coil in the secondary coil, and levitates the secondary coil due to the repulsion of the magnetic flux,
The levitating secondary coil is composed of three coils including first to third coils, and the first to third coils are set to each other with the X-axis, Y-axis, and Z-axis passing through the same center point as axial directions. The outer diameter of the primary coil is 1.2 times to 100 times the outer diameter of the secondary coil, and the central axis of one of the secondary coils The superconducting actuator is characterized in that the repulsive magnetic flux is generated so as to be in the same direction as the central axis of the primary coil, and the floating of the secondary coil is maintained.

The central axes of the first to third coils of the secondary coil are the X-axis direction, the Y-axis direction, and the Z-axis direction that pass through the same center point, but in the range of 90 ° ± 10 ° to each other, It also includes the case where it is shifted.
As described above, in the present invention, the secondary coil for levitation is formed by three coils that are shifted by about 90 degrees and coupled to each other by three coils on a regular octahedron inscribed in a virtual sphere surrounded by these coils. Even if the secondary coil rotates 90 degrees in any of X, Y, and Z directions, the central axis of any one of the three coils substantially coincides with the central axis of the primary coil. It is set.

The outer diameter of the primary coil is 1.2 times or more and 100 times or less, more preferably 1.5 times or more and 20 times or less, and further preferably 2 times or more and 4 times or less than the outer diameter of the secondary coil.
Also, a superconducting wire may be used as the primary coil, and the primary coil may be formed of a double pancake coil laminate.
With the above configuration, the magnetic flux generated in the primary coil made of a superconducting wire and having a large outer diameter can be strengthened and the magnetic flux range can be widened, and the three coils of the secondary coil can be arranged within the magnetic flux range of the primary coil. .
The vertical magnetic flux generated in the primary coil is larger around the central axis than on the central axis of the primary coil. Therefore, when the secondary coil levitated on the central axis of the primary coil is likely to move to a position shifted from the central axis of the primary coil, the secondary coil is an axis that increases the repulsive force between the primary coil and the secondary coil. There is an area where the repulsive force returns from the peripheral position of the coil to the center axis of the primary coil and floats in a stable state. Accordingly, the secondary coil can be stably levitated at a fixed position without moving the secondary coil.

  Since the secondary coil for levitation has the above-described configuration, when the secondary coil rotates due to vibration or the like when the axial direction of the first coil of the secondary coils is made to coincide with the axial direction of the primary coil, The magnetic flux of the primary coil interlinked with the first coil is reduced and the levitation force by the first coil is reduced. However, when the secondary coil rotates, the magnetic flux of the primary coil is transferred to the other second coil or the third coil. Interlinking causes a magnetic flux repelling the magnetic flux of the primary coil to be generated in the second coil or the third coil, and the secondary coil continues to float at substantially the same height.

Specifically, when the secondary coil rotates at an angle of less than 45 degrees due to vibration or the like, the central axis is primary before the rotation due to the repulsive force generated between two of the three coils. The coil that coincides with the central axis of the coil is rotated so as to return to the original position.
That is, the central axis of the first coil of the secondary coil rotates at an angle of less than 45 degrees from the state in which it matches the central axis of the primary coil, and the central axis of the first coil and the central axis of the primary coil are 45 When the phase is less than 50 degrees, the center axis of the second coil of the secondary coil is close to the center axis of the primary coil at 45 degrees or more and less than 90 degrees, and the magnetic flux in the repulsive direction is also between the second coil and the primary coil. Is generated, the secondary coil is prevented from further rotating, and the secondary coil is rotated back to the original position so that the axial direction of the first coil coincides with the axial direction of the primary coil.

In addition, when the rotation angle of the secondary coil exceeds 45 degrees, the repulsive force generated between two of the three coils causes the central axis to rotate with the central axis of the primary coil before rotation. The secondary coil is rotated so that the central axis of a coil different from the matched coil matches the central axis of the primary coil.
That is, when the center axis of the first coil of the secondary coil coincides with the center axis of the primary coil and rotates more than 45 degrees and less than 90 degrees, the axis of the first coil becomes the center axis of the primary coil. While the phase is greater than 45 degrees, the center axis of the second coil is close to the center axis of the primary coil at a phase angle of less than 45 degrees and is generated between the second coil and the primary coil. The repulsive force becomes larger than the repulsive force with the first coil, and the central axis of the second coil rotates so as to coincide with the central axis of the primary coil.

Moreover, the magnitude | size of the magnetic flux which generate | occur | produces in the 1st-3rd coil of the said secondary coil changes with the diameter of the 1st-3rd coil, the number of turns, and the length of the superconducting wire to be used.
For example, when the number of turns of the first to third coils of the secondary coil is made equal, the smaller the coil diameter, the smaller the number of interlinkage magnetic fluxes, so that the magnetic flux generated in the coil becomes smaller and the levitation force becomes smaller.
Furthermore, since the magnetic flux generated in the coil increases as the number of turns of the coil increases, the number of turns increases as the coil with a smaller diameter, while the number of turns decreases as the coil with a larger diameter is used for each coil. If the length of the superconducting wire is made uniform, the levitation force of each coil can be made equal. In this case, when the secondary coil is rotated, the secondary coil continues to rotate until the rotational force is attenuated by air resistance or the like.

Thus, even if the secondary coil that is levitated so as to be able to rotate without being regulated by the guide means is rotated by vibration or the like, the repulsive force generated between any one of the first to third coils and the primary coil. Thus, the central axis of any of the coils is automatically rotated in a direction that coincides with the central axis of the primary coil, and the secondary coil is levitated, so that a highly reliable levitating system can be obtained.
As described above, since the floating of the secondary coil can be ensured while the primary coil is energized, the electrical insulation between the primary coil and the secondary coil can be reliably achieved. Therefore, it can be widely used as an industrial actuator that requires insulation between the primary coil and the secondary coil.

In addition, since the primary coil is not a permanent magnet but a coil connected to a power source, the amount of magnetic flux generated in the primary coil can be changed by adjusting the amount of current supplied to the primary coil, and the flying height of the secondary coil Can be adjusted.
That is, if the energization amount to the primary coil is increased, the secondary coil moves away from the primary coil, while if the energization amount to the primary coil is decreased, the secondary coil is closer to the primary coil. Move to. Therefore, when the energization amount to the primary coil is periodically changed, power can be obtained by reciprocating linear motion of the secondary coil.
In particular, when the present invention is used for teaching materials, not only the secondary coil is floating at a fixed position, but also the secondary coil is separated from the primary coil by changing the value of the current supplied to the primary coil. Since it moves in the proximity direction, it can attract the interest of the learner.

The first to third coils of the secondary coil have different inner diameters, the second coil is fitted and fixed to the first coil, and the third coil is fitted and fixed to the second coil. .
Specifically, the part which contacts in the said external fitting state is being fixed with the adhesive agent.
The inner diameter of the first to third coils means the inner diameter of the winding frame when the winding frame is provided on the inner peripheral side of the coil, and the outer diameter of the first to third coils is When an insulating tape or the like is wound around the outer peripheral surface of the coil, it means an outer diameter in a state where the insulating tape or the like is wound.

In addition, as a coupling form of the first to third coils, four fitting recesses are provided on the outer circumferential surface of the first coil at intervals of 90 degrees in the circumferential direction, and on the outer circumferential surface of the second coil. Two fitting recesses are provided at an interval of 180 degrees in the circumferential direction, the second coil is fitted into two opposing fitting recesses of the first coil, and the second coil is externally fitted to the first coil. Furthermore, the third coil is fitted to the first and second coils by fitting the remaining two fitting recesses facing the first coil and the two fitting recesses facing the second coil. The secondary coil may be formed by externally fitting a coil.
The concave portion provided on the outer peripheral surface of the coil is provided with a concave portion on the outer periphery by partially projecting the inner diameter when winding a superconducting wire serving as a coil.

The 1st-3rd coil of the secondary coil which consists of the said superconducting wire is accommodated in one cooling container, or the 1st-3rd coil is each accommodated in the annular cylindrical cooling container.
In addition, when the primary coil is formed of a superconducting wire, it is necessary to accommodate it in a cooling container as with the secondary coil.

As the superconducting wire, for example, a high-temperature superconducting wire such as a bismuth-based superconducting wire is preferably used. Since the bismuth superconducting wire is sufficiently superconducting at about 77 Kelvin, relatively inexpensive liquid nitrogen can be used as the cooling medium filled in the cooling vessel.
As described above, by housing the three secondary coils in the cooling container and keeping them at the superconducting temperature, the secondary coil can continue to float.
If the cooling container is made of a transparent material, the secondary coil can be shown floating while the secondary coil is housed in the cooling container, which is suitable for learning and demonstration purposes. Become.

  As described above, according to the present invention, the levitating secondary coil is combined with the first to third coils having the central axes in the X-axis, Y-axis, and Z-axis directions passing through the same central point. Because it is formed, even if the secondary coil rotates due to vibration etc., repulsive force is generated between any of the secondary coils and keeps floating without dropping the secondary coil Can do. Therefore, there is no need to provide guide means for restricting the secondary coil to be non-rotatable, and stable levitation can be maintained.

Embodiments of the present invention will be described with reference to the drawings.
1 to 5 show a first embodiment of the present invention.
The actuator 10 of the present embodiment is composed of a superconducting actuator in which both a primary coil 11 and a secondary coil 12 are formed of bismuth-based superconducting wires.

The primary coil 11 is formed by laminating a plurality of double pancake coils in which two layers of coil portions are continuous at the crossing portion of the innermost turn in the axial direction, and connecting superconducting wires of adjacent double pancake coils to form a single coil. It is a superconducting coil. A DC power source 20 is connected to a superconducting wire terminal of a double pancake coil at both axial ends of the primary coil 14 via a lead wire 22.
In the present embodiment, three layers of double pancake coils having an inner diameter of 230 mm, an outer diameter of 264 mm, and a winding number of 106 turns are laminated to a height of 30 mm.

On the other hand, the secondary coil 12 is formed of three superconducting coils including a first coil 13, a second coil 14, and a third coil 15. Each of the first to third coils 13 to 15 is connected to both ends of a superconducting wire using a silver conductive material to form a closed circuit.
These three first to third coils 13 to 15 are coupled with the X-axis line, the Y-axis line, and the Z-axis line passing through the same center point O as axial directions and shifted by about 90 degrees. The enclosed virtual sphere is divided into a regular octahedron shape by the three coils 13 to 15.

Specifically, the first coil 13, the second coil 14, and the third coil 15 have the same number of turns, but have different diameters.
The first coil 13 is externally fitted with a second coil 14 whose axial direction is the X direction and the axial direction is the Y direction, and the outer peripheral surface of the first coil 13 and the inner peripheral surface of the second coil 14. The contact surface is fixed with an adhesive. Further, a third coil 15 whose axial direction is the Z direction is externally fitted to the second coil 14, and the contact surface between the outer peripheral surface of the second coil 14 and the inner peripheral surface of the third coil 15 is interposed via an adhesive. One secondary coil 12 is formed by the first to third coils 13 to 15 being fixed.
That is, of the first to third coils 13 to 15 of the secondary coil 12, the third coil 15 is the maximum diameter, the outer diameter of the third coil 15 is 60 mm, and the outer diameter (264 mm) of the primary coil 11. It is also small.

  Adhesive tape is wound around the outer peripheral surfaces of the first to third coils 13 to 15 of the secondary coil 12, and a winding frame 16 around which a superconducting wire is wound is disposed on the inner peripheral side. The first coil 13 and the second coil 14, and the second coil 14 and the third coil 15 are insulated from each other.

  The three first to third coils 13 to 15 and the primary coil 11 constituting the secondary coil are formed of a bismuth-based superconducting material made of a high-temperature superconducting material.

  Since the superconducting actuator of this embodiment is used for teaching materials, a cooling container filled with liquid nitrogen is provided separately, and the primary coil 11 and the secondary coil 12 are immersed in the liquid container to obtain a superconducting temperature, and then taken out. Used. Further, a dry battery is used as a power source to be connected to the primary coil and connected via the cord 22, and a switch is provided at a connection portion with the dry battery so that the energization amount to the primary coil can be increased or decreased in a plurality of stages.

Next, an operation method of the actuator 10 will be described.
First, before operating the actuator 10, the primary coil 11 and the secondary coil 12 are accommodated and cooled in a cooling container (not shown) in which liquid nitrogen is stored.
Next, after the primary and secondary coils 11 and 12 are cooled to the superconducting temperature, the primary coil 11 and the secondary coil 12 are taken out of the cooling container and arranged so that the coil axis direction of the primary coil 11 is vertical. The secondary coil 12 is disposed on the upper end surface of the primary coil 11. At this time, the axial direction of any one of the secondary coils 12 is made to coincide with the axial direction of the primary coil, and in this embodiment, the axial direction of the third coil 15 is made to coincide with the axial direction of the primary coil. ing.

Next, when the switch of the power source 20 is turned on and a required current is passed through the primary coil 11, an axial magnetic flux F1 indicated by an arrow is generated in the primary coil 11 as shown in FIG. The induced current flows so that the magnetic flux F1 of the primary coil 11 passes through the third coil 15 in which the end faces are opposed to the coil 11, and the magnetic flux F2 that tries to cancel the magnetic flux F1 is generated. As a result, the secondary coil 12 repels the primary coil 11 and floats on the primary coil 11.
Since the secondary coil 12 is made of a superconducting wire, there is no resistance other than the portion connected by the silver conductive material and the resistance is extremely low. Therefore, once the current flows, the secondary coil 12 continues to flow for a long time, Maintained in a floating state.

  When the secondary coil 12 rotates 90 degrees around the center point O by a vibration or the like in a state where the induced current flows through the third coil 15 of the secondary coil 12 and the secondary coil 12 is floating, As shown in FIG. 3B, in the secondary coil 12, the central axis of the second coil 14 is in the same direction as the central axis of the primary coil 11, and the end surface 14a in the axial direction of the second coil 14 is the end surface of the primary coil 11. The magnetic flux F <b> 1 of the primary coil 11 passes through the second coil 14. As a result, an induced current flows through the second coil 14 to generate a magnetic flux F2 that tries to cancel the magnetic flux F1 generated in the primary coil 11, and the secondary coil 12 continues to float on the primary coil 11.

Further, the central axis of the third coil 15 shown in FIG. 4A rotates 90 degrees from the same axial state as the primary coil 12, and the central axis of the first coil 13 becomes the primary as shown in FIG. 4B. When the end surface 13a in the axial direction of the first coil 13 is disposed opposite to the end surface 11a of the primary coil 11 in the same direction as the central axis of the coil 11, the magnetic flux F1 of the primary coil 11 passes through the first coil 13. As a result, an induced current flows through the first coil 13 to generate a magnetic flux F2 that tries to cancel the magnetic flux F1 generated in the primary coil 11, and the secondary coil 12 continues to float on the primary coil 11.
In this manner, the levitated secondary coil 12 is formed by connecting the three first to third coils 13 to 15 with the axial directions shifted by 90 degrees in the X, Y, and Z directions. Even if it is rotated 90 degrees, the magnetic flux F2 is generated in any one of the coils 13 to 15, and the secondary coil can continue to float.

  Further, due to vibration or the like, the central axis of the first coil 13 of the secondary coil 12 rotates at an angle of less than 45 degrees from the state where it coincides with the central axis of the primary coil 11, and the central axis of the first coil 13 When the central axis of the primary coil is phased at less than 45 degrees, the central axis of the second coil 14 of the secondary coil is close to the central axis of the primary coil at 45 degrees or more and less than 90 degrees, and also close to the second coil 14. Repulsive magnetic flux is generated between the primary coil, the secondary coil 12 is prevented from further rotating, and the secondary coil so that the axial direction of the first coil 13 coincides with the axial direction of the primary coil 11. Rotate the coil back to its original position.

  Further, the secondary coil 12 rotates more than 45 degrees and less than 90 degrees, and the central axis of the first coil 13 of the secondary coil is within the range of more than 45 degrees and less than 90 degrees with the central axis of the primary coil 11. In phase, when the rotation axis of the third coil 15 approaches the rotation axis of the primary coil 11 at an angle of less than 45 degrees, the repulsive force of the third coil 15 is greater than that of the first coil 13, and the third coil 15 The secondary coil 12 is rotated in a direction in which the central axis of the first coil 11 coincides with the central axis of the primary coil 11.

  In this way, the secondary coil 12 is rotated by vibration or the like by including the three first to third coils 13 to 15 in which the secondary coil 12 is shifted by 90 degrees in the X, Y, and Z directions. Even so, the center axis of one of the coils is always automatically rotated so as to coincide with the center axis of the primary coil 11, and the levitation can be continued without dropping the secondary coil 12.

Furthermore, since the outer diameter of the primary coil 11 is made four times or more larger than the outer diameter of the secondary coil 12, the first to third of the secondary coil 12 are within the magnetic flux range of the magnetic flux F1 generated in the primary coil 11. Coils 13-15 can be positioned.
Therefore, when the secondary coil 12 is levitated on the central axis of the primary coil 11, as shown in FIG. 5, the surrounding area surrounding the secondary coil 12 is closer to the primary coil 11 than the levitated position of the secondary coil 12. The generated vertical magnetic flux is large. Therefore, when the secondary coil 12 is likely to be displaced from the central axis of the primary coil 11, the secondary coil 12 has a small repulsive force from the position around the axis where the repulsive forces of the primary coil 11 and the secondary coil 12 increase. Returning to the central axis of the primary coil 11 and rising in a stable state.
Thereby, the secondary coil 12 levitated on the central axis of the primary coil 11 can be levitated to a fixed position without being displaced from the central axis of the primary coil 11.

Further, when the magnitude of the current value energized to the primary coil 11 by the power source 20 is changed, the magnitudes of the magnetic fluxes F1 and F2 generated in the primary coil 11 and the secondary coil 12 are also changed, and the change in the magnetic fluxes F1 and F2 is caused. The repulsive force generated between the primary coil 11 and the secondary coil 12 is also changed, and the flying height of the secondary coil 12 can be adjusted.
In this way, by changing the value of the current supplied to the primary coil 11, the secondary coil 12 can be moved in the vertical direction, and the secondary coil 12 can be reciprocated linearly.

As described above, in the actuator 10 of the present embodiment, which is used for teaching materials, when a current is passed through the primary coil 12 with the primary coil 11 and the secondary coil 12 removed from the cooling container, the secondary coil 12 is levitated. The state where the secondary coil 12 is levitated can be seen from the outside.
In addition, even if the secondary coil levitated by the magnetic repulsive force rotates due to vibration or the like, or is intentionally given vibration when explained as a teaching material, any of the first to third coils 13 to 15 The end face in the axial direction of the coil can be automatically rotated so as to face the end face 11a in the axial direction of the primary coil 11, and the coil is levitated without using a guide means for restricting the rotation of the secondary coil. The secondary coil 12 can be levitated in a stable state.
Furthermore, since the secondary coil 12 is formed of a superconducting wire, there is no resistance other than the connecting portion connecting both ends of the superconducting wire, and once the current flows through the secondary coil 12, it continues to flow for a long time. Can be kept at a predetermined position away from the primary coil 11.

  In the present embodiment, the primary coil 11 is a double pancake coil. However, the primary coil 11 may be a single pancake coil, and is not limited to a superconducting wire, and may be a normal conducting wire such as a copper wire. The secondary coil 12 is not limited to a single pancake coil, and may be a double pancake coil.

FIG. 6 shows a modification of the first embodiment.
This modification is not for teaching materials, but uses the superconducting actuator of the present invention such as a reciprocating linear motion of a secondary coil instead of a cylinder or a motor by converting the linear motion of a secondary coil into a rotational motion. The configuration is suitable for industrial use.

The actuator 10 can be operated in a state where the primary coil 11 and the secondary coil 12 are accommodated in cooling containers 30 and 40 in which liquid nitrogen is stored, respectively.
The cooling container 30 that houses the primary coil 11 has a hollow cylindrical shape, and the primary coil 11 is positioned in the cooling container 30 by a resin spacer 31.
On the other hand, the cooling container 40 that accommodates the secondary coil 12 has a hollow spherical shape, the third coil 15 of the secondary coil 12 is positioned by the resin spacer 41, and the secondary coil 12 is positioned in the cooling container 40. ing.

According to the above configuration, since the primary coil 11 and the secondary coil 12 can be accommodated in the cooling containers 30 and 40 and can be continuously cooled while the actuator 10 is operating, the superconducting state of the secondary coil 12 is maintained. It can continue to surface for a longer time.
In addition, in this modification, the cooling containers 30 and 40 are configured by only one tank, but the inner tank and the outer tank may be provided via a hollow heat insulating layer.
Since other configurations and operational effects are the same as those of the first embodiment, the same reference numerals are given and description thereof is omitted.

FIG. 7 shows a second modification of the first embodiment.
In this modification, the cooling container that accommodates the secondary coil 12 is different from that in the first modification, and the first to third coils 13 to 15 of the secondary coil 12 are each formed in a hollow annular cylindrical cooling container. The cooling vessel 43 containing the second coil 14 is externally fitted to the cooling vessel 42 containing the first coil 13 and fixed via an adhesive. A cooling container 44 containing three coils 15 is externally fitted and fixed via an adhesive.
In addition, since another structure and an effect are the same as that of 1st Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

FIG. 8 shows a second embodiment of the present invention.
In the present embodiment, the shape of the secondary coil 12 is different from that of the first embodiment, the diameters of the first to third coils 13 to 15 are the same, and the outer peripheral surface of the first coil 13 is spaced by 90 degrees. In addition, four recesses 13b and 13c for fitting coils are provided, and two recesses 14b for fitting coils are provided on the outer peripheral surface of the second coil 14 with an interval of 180 degrees.
The second coil 14 is fitted in the concave portion 13 b (the vertical position in FIG. 8) facing the first coil 13, and the second coil 14 is fitted on the first coil 13. At this time, the remaining opposing recesses 13c (left and right positions in FIG. 8) of the first coil 13 and the recesses 14b of the second coil 14 are arranged on the same circumference.
Further, the third coil 15 is fitted in the concave portion 13 c facing the first coil 13 and the concave portion 14 b of the second coil 14, and the third coil 15 is fitted on the first and second coils 13 and 14.

According to the said structure, the outer peripheral surface of the secondary coil 12 formed with the 1st-3rd coils 13-15 can be brought closer to spherical shape, and the secondary coil 12 can be levitated in the stable state. In addition, when the actuator is used for teaching materials, the appearance can be improved.
In addition, since another structure and an effect are the same as that of 1st Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

FIG. 9 shows a third embodiment of the present invention.
In this embodiment, the first to third coils 13 to 15 of the secondary coil 12 are different from those of the above embodiment, and the first to third coils 13 to 15 are made of silver conductive material at both ends of the superconducting wire. The connected winding is a one-turn loop coil. The superconducting wire is the same as in the above embodiment.
The outer diameter of the first coil 13 is 60 mm, the outer diameter of the second coil 14 is 61 mm larger than the outer diameter of the first coil, and the outer diameter of the third coil 15 is 62 mm larger than the outer diameter of the second coil. And the lengths of the superconducting wires of the first to third coils 13 to 15 are substantially equal.
An insulating material (not shown) is interposed at the position where the superconducting wires of the first to third coils 13 to 15 intersect, so that the coils do not conduct each other, and each coil is bonded via an adhesive. The first to third coils 13 to 15 may be combined by winding a tape around the position where the superconducting wires intersect.

According to the said structure, since the length of the superconducting wire which forms each coil of the 1st-3rd coils 13-15 is made substantially equivalent, the magnetic flux which generate | occur | produces in the 1st-3rd coils 13-15 can be made uniform. The secondary coil can be levitated in a stable state.
In addition, since another structure and an effect are the same as that of 1st Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  The above-described embodiments are exemplifications in all points, and are not limited to these embodiments. The scope of the present invention is indicated by the scope of claims, and all modifications within the scope equivalent to the scope of claims are made. Is included.

  In addition, it formed with the normal conducting wire which consists of a primary coil and a secondary coil copper wire, connected the alternating current power supply via the lead wire to the primary coil, and combined the said secondary coil in three orthogonal directions like this invention. When formed with the first to third coils, it is possible to provide an actuator including a levitation coil having the same function as the present invention.

  The superconducting actuator of the present invention can be used for industrial purposes such as attraction in transfer devices, railway vehicles, amusement parks, cylinders, motors, shakers, speakers, etc. A structure can also be constructed. Furthermore, it can be suitably used as a teaching material for showing the performance of superconductivity.

It is drawing which shows the actuator of 1st Embodiment of this invention. (A)-(C) are sectional drawings of a secondary coil. (A) is drawing which shows the state which raised the secondary coil, (B) is drawing which shows the state which the secondary coil of the state of (A) rotated. (A) is a figure which shows the state which floated the secondary coil, (B) is a figure which shows the state which the secondary coil of the state of (A) rotated in the direction different from FIG. 4 (B). It is drawing which shows the relationship between the position of the radial direction of a primary coil, and the magnitude | size of a magnetic field. It is drawing which shows the 1st modification of 1st Embodiment. It is drawing which shows the 2nd modification of 1st Embodiment. It is drawing which shows the secondary coil of 2nd Embodiment of this invention. It is drawing which shows the secondary coil of 3rd Embodiment of this invention. It is drawing which shows a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Actuator 11 Primary coil 12 Secondary coil 13 1st coil 14 2nd coil 15 3rd coil 20 Power supply 30, 40, 42-44 Cooling container

Claims (3)

A primary coil connected to a power source and held in place, and a levitation secondary coil that connects both ends of the superconducting wire to form a closed circuit, and is generated in the primary coil when the primary coil is energized A superconducting actuator that generates a repulsive magnetic flux and a repelling magnetic flux in the secondary coil, and levitates the secondary coil due to the repulsion of the magnetic flux,
The levitating secondary coil is composed of three coils including first to third coils, and the first to third coils are set to each other with the X-axis, Y-axis, and Z-axis passing through the same center point as axial directions. The outer diameter of the primary coil is 1.2 times to 100 times the outer diameter of the secondary coil, and the central axis of one of the secondary coils The superconducting actuator is characterized in that the repulsive magnetic flux is generated so as to be in the same direction as the central axis of the primary coil and the floating of the secondary coil is maintained.   The superconducting actuator according to claim 1, wherein a superconducting wire is used as the primary coil, and the primary coil is formed of a laminated body of double pancake coils.   The first to third coils of the secondary coil have different inner diameters, the second coil is fitted and fixed to the first coil, and the third coil is fitted and fixed to the second coil. The superconducting actuator according to claim 1 or 2.

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