JP3202615U - Magnetic bearing device - Google Patents

Abstract

Provided is a magnetic bearing device suitable as a teaching material or toy for learning the fun of magnetic force of a magnet and considering various uses of the magnet. In a magnetic bearing device (22) that supports at least one of upper and lower ends of a rotor rotation shaft (16) of a rotor (14) arranged vertically so as to be rotatable by magnetic force, one end of the rotor rotation shaft (16) is provided. A rotation-side magnet 30 that rotates together with the rotor 14, a cylindrical tube 32 that is arranged on the axis of the rotor rotation shaft 16 and that can accommodate the rotation-side magnet 30 in a non-contact manner, and a cylindrical tube Bearing side magnet 34 surrounding continuously or discontinuously around 32, and the polarities of the opposed surfaces of the rotation side magnet 30 and the bearing side magnet 34 are different polarities. [Selection] Figure 1

Description

  The present invention relates to a magnetic bearing device, and more particularly to a magnetic bearing device that is used as a scientific teaching material or toy using magnets and is suitable for learning the application of magnetic force.

  Teaching materials and toys that use the attractive force and repulsive force, which are the magnetic forces of magnets, are known in the art, and are suitable for children to learn about magnetic forces through scientific teaching materials and toys that use magnets.

  For example, Patent Document 1 discloses that a plurality of block bodies can be stacked and played using the attractive force of a magnet built in the block body, and can be connected to a desired posture. A block toy that is separated and played in another connected state is disclosed.

  Further, in Patent Document 2, the N pole or S pole of a magnet or magnet is arranged in a plane or three-dimensionally on one side, and the N or S pole of a magnet or magnet is arranged on the other side in the same or reverse manner or randomly. There is disclosed a product using a magnet that is arranged in a three-dimensional manner or three-dimensionally so that one of the objects is movably held by utilizing the attraction and repulsion between each other to float in the space.

Japanese Patent Laid-Open No. 2005-25396 JP 2007-185450 A

  However, those using the magnets of Patent Documents 1 and 2 attract different poles such as the N pole and the S pole, and the same poles of the N pole and the N pole or the S pole and the S pole repel each other. The operation itself is relatively simple. Therefore, since it is easy to predict what kind of operation will be performed, it is not interesting and easy to get bored in discovering the fun of the magnet and learning the application of the magnet.

  That is, if it is possible to observe an operation with no expectation of what kind of operation will be performed with a magnet, the fun of teaching materials and toys can be increased. Furthermore, it is suitable as a teaching material or a toy for considering various uses of a magnet to know how the operation of an unexpected magnet can be specifically applied.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a magnetic bearing device suitable as a teaching material or toy for learning the fun of magnetic force of a magnet and considering various uses of the magnet.

  In order to achieve the above object, a magnetic bearing device according to the present invention is a magnetic bearing device that supports at least one of the upper and lower ends of a rotating shaft of a rotating body arranged vertically so as to be rotatable by magnetic force. A magnetic body that is provided at one end of the rotating shaft and rotates together with the rotating body, and a vertically disposed cylindrical tube that is disposed on the axis of the rotating shaft and can store the magnetic body in a non-contact manner. And a bearing-side magnet surrounding the cylindrical tube continuously or discontinuously.

  Here, the magnetic material means a metal that can be attached to the magnet, and examples thereof include iron, nickel, cobalt, and stainless steel.

  According to the present invention, since the magnetic bearing device is configured as described above, when the magnetic body provided on the rotating shaft is housed from the outside to the inside of the cylindrical tube, the magnet formed in the cylindrical tube by the bearing side magnet. The magnetic body can be stopped in a floating state in the cylindrical tube by the force.

  When the rotating body is rotated in this state, the rotating body is rotatably supported by the magnetic force of the magnetic bearing device and rotates. In this case, even if the rotational balance of the rotating body is lost and the rotation axis is tilted, the magnetic material is stored in the cylindrical tube so that the balance is not greatly lost. A bearing device can be constructed.

  Further, in order to achieve the above object, the magnetic bearing device of the present invention supports at least one of the upper and lower ends of the rotating shaft of a rotating body arranged vertically so as to be freely rotatable by magnetic force. The rotary shaft is provided at one end of the rotating shaft, and is disposed on the axis of the rotating shaft, and is disposed vertically on the rotating shaft so that the rotating magnet can be stored in a non-contact manner. A cylindrical tube and a bearing-side magnet surrounding the cylindrical tube continuously or discontinuously are provided, and the opposing surfaces of the rotating-side magnet and the bearing-side magnet have different polarities.

  The present invention is a case where a magnet is provided on the rotating shaft instead of a magnetic body, and the rotating side magnet and the bearing side magnet are arranged so that the polarities of the opposing surfaces are different from each other. If it is housed in the inside, the rotating side magnet can be stopped in a floating state at a height position in the cylindrical tube where the attractive force and the repulsive force formed by the magnetic field lines formed by the rotating side magnet and the bearing side magnet are balanced. .

  When the rotating body is rotated in this state, the rotating body is rotatably supported by the magnetic force of the magnetic bearing device and rotates. In this case, even if the rotation balance of the rotating body is lost and the rotation axis is inclined, the rotation-side magnet is housed in the cylindrical tube so that the balance is not greatly lost. A magnetic bearing device can be constructed.

  Therefore, by using the magnetic bearing device of the present invention as a bearing for a rotating body, it is possible to construct a bearing that hardly wears the bearing portion due to the rotation of the rotating body. It is possible to provide a magnetic bearing device suitable as a teaching material or a toy considering various uses.

  Here, the bearing-side magnet surrounding the cylindrical tube continuously or discontinuously means, for example, that the lower portion of the cylindrical tube is inserted into a cylindrical cavity formed continuously or discontinuously at the center of the bearing-side magnet. And a case where the cylindrical tube is provided on a cylindrical hollow portion having the same diameter as the cylindrical tube.

In the aspect of the present invention, it is preferable that the bearing-side magnet has a ring shape.
This is one aspect of the bearing-side magnet, and by forming a cylindrical tube upright in the center through-hole of the ring-shaped magnet having the center through-hole, a hollow portion that stops the rotation-side magnet in a floating state is formed. It is a thing. In this case, it is more preferable to provide a pair of ring-shaped magnets at the upper and lower ends of the cylindrical tube.

In the aspect of the present invention, the bearing-side magnet is preferably a plurality of magnet pieces that discontinuously surround the cylindrical tube.
This is another aspect of the bearing-side magnet. Instead of the ring-shaped magnet described above, the rotation-side magnet is stopped in a floating state in the cylindrical tube even if it is a plurality of magnet pieces that surround the cylindrical tube discontinuously. Can be made.

  In the aspect of the present invention, the magnetic body is preferably spherical. This is because if the magnetic body is shaped like a disk, a floating state is formed while the magnetic body is standing due to the magnetic force formed in the cylindrical tube by the bearing side magnet, and rotation is difficult to stabilize. .

  In the aspect of the present invention, it is preferable that the rotation-side magnet has a disk shape or a spherical shape. In the case of the rotation-side magnet, even if it is plate-shaped, the rotation-side magnet does not stand up due to the magnetic force generated by the bearing-side magnet unlike a magnetic body. Therefore, if the shape of the rotating side magnet is a disk shape or a spherical shape, the contact resistance can be reduced even when the rotating side magnet contacts the cylindrical tube when the rotating body rotates, and the rotating body can be rotated smoothly. Can do.

According to the present invention, when a magnetic body is provided on the rotating shaft, the magnetic body can be stopped in a floating state in the cylindrical tube by the magnetic force formed in the cylindrical tube by the bearing side magnet.
Further, when the rotation side magnet is provided on the rotation shaft, the rotation side magnet may be suspended in a floating state at a height position in the cylindrical tube where the attractive force and the repulsive force of the rotation side magnet and the bearing side magnet are balanced. it can.

  Therefore, by using the magnetic bearing device of the present invention as a bearing for a rotating body, it is possible to construct a bearing that hardly wears the bearing portion due to the rotation of the rotating body. It is possible to provide a magnetic bearing device suitable as a teaching material or a toy considering various uses.

Overall configuration diagram of a first embodiment in which the magnetic bearing device of the present invention is incorporated as a DC motor bearing Explanatory drawing explaining the aspect of the bearing side magnet of a magnetic bearing apparatus Explanatory drawing explaining the aspect of the bearing side magnet of a magnetic bearing apparatus, and the aspect of a rotation side magnet 3A view from above Explanatory drawing explaining another aspect of the rotation side magnet of a magnetic bearing apparatus Overall configuration diagram of a second embodiment in which the magnetic bearing device of the present invention is incorporated as a DC motor bearing Overall configuration diagram of a third embodiment in which the magnetic bearing device of the present invention is incorporated as a DC motor bearing

A preferred embodiment of a magnetic bearing device according to the present invention will be described below with reference to the accompanying drawings.
[First Embodiment]
FIG. 1 is an overall configuration diagram of a first embodiment in which a magnetic bearing device of the present invention is incorporated in a DC motor that is an example of a rotating body. That is, this is a case where the rotor of a DC motor arranged vertically is used as a bearing that rotatably supports the magnetic bearing device of the present invention on both the upper and lower ends of the rotor rotation shaft.
FIG. 1A is a cross-sectional view illustrating the overall configuration of a DC motor, and FIG. 1B is a perspective view of a magnetic bearing device provided at the lower end of a rotor rotation shaft.

  As shown in FIG. 1A, the DC motor 10 includes a pair of stators 12 (fields), a rotor 14 (rotor) disposed inside the stator 12, and a rotor rotation shaft 16 of the rotor 14. The commutators 18 and 18, a pair of brushes 20 and 20 that press the pair of commutators 18, and a pair of magnetic bearing devices 22 and 22 that rotatably support upper and lower ends of the rotor rotation shaft 16. . The pair of brushes 20 and the positive electrode and the negative electrode of the battery 26 are connected by the two lead wires 24 and 24, and an ON / OFF switch 28 is provided in the middle of the lead wire 24.

  The cylindrical tube of the stator 12, the pair of commutators 18, 18, the pair of brushes 20, 20, and the pair of magnetic bearing devices 22, 22 that rotatably supports the upper and lower ends of the rotor rotation shaft 16. 32 and the bearing-side magnet 34 are supported by a support frame (not shown). Further, the rotor 14, the rotor rotating shaft 16, and the rotation-side magnet 30 of the magnetic bearing device 22 are formed as a single body and are detachably provided from the magnetic bearing device 22.

Although DC motor 10 of the present embodiment is a case where permanent magnets are used for stator 12 and rotor 14, electromagnets can also be used for fixed stator 12.
The magnetic bearing device 22 according to the embodiment of the present invention can take two modes, a case where a magnetic body is provided on the rotor rotating shaft 16 and a case where a rotating shaft side magnet is provided. In the embodiment, description will be made mainly on the case where a rotating shaft side magnet is provided.

  That is, as shown in FIG. 1B, the magnetic bearing device 22 according to the embodiment of the present invention is provided at one end of the rotor rotating shaft 16 and rotates with the rotor-side magnet 30 and the rotor 14. A longitudinally arranged cylindrical tube 32 disposed on the axis of the rotating shaft 16 and capable of accommodating the rotating side magnet 30 in a non-contact manner, and a bearing side magnet 34 surrounding the cylindrical tube 32 continuously or discontinuously. It is comprised so that the polarity of the opposing surface of the rotation side magnet 30 and the bearing side magnet 34 may be different polarity.

  In the above configuration, since the rotation-side magnet 30 rotates with the rotor 14, it is necessary to use a permanent magnet. However, since the bearing-side magnet 34 is fixed, either a permanent magnet or an electromagnet can be used.

  When the rotor rotating shaft 16 is provided with a magnetic material, a magnetic material (ferromagnetic material) that is a metal such as iron, nickel, cobalt, and stainless steel attached to the magnet is provided instead of the rotation-side magnet 30 in FIG. The cylindrical tube 32 and the bearing-side magnet 34 described above are the same, but the polarity of the facing surface of the bearing-side magnet 34 that faces the magnetic body may be N or S.

  The cylindrical tube 32 is preferably formed of a hard material that is transparent and not easily damaged so that the behavior of the rotation-side magnet 30 accommodated in the cylindrical tube 32 can be observed from the outside. As a specific material of the cylindrical tube 32, transparent glass or acrylic resin which is transparent and hard plastic can be suitably used.

  As shown in FIG. 2A, the bearing-side magnet 34 is formed in a ring shape having a hollow portion 36 at the center. In this case, the hollow portion 36 is preferably formed in a cylindrical hollow portion 36 having substantially the same diameter as the cylindrical tube 32. However, the outer shape of the bearing-side magnet 34 is not limited to a circular shape, but as shown in FIG. The shape may be rectangular or other shapes.

  Furthermore, the bearing side magnet 34 may form the above-described cavity 36 by continuously surrounding the cylindrical tube 32, and as shown in FIGS. 3A and 3B, a plurality of magnet pieces 34A, 34A. The cylindrical tube 32 may be discontinuously surrounded. FIG. 3 shows a case where the cylindrical tube 32 is disposed by four magnet pieces 34A at intervals of 90 degrees. Also in this case, it arrange | positions so that the polarity of the opposing surface of the rotation side magnet 30 and the four magnet pieces 34A of the bearing side magnet 34 may be different polarities.

  On the other hand, the rotation-side magnet 30 housed in the cylindrical tube 32 is generally a disc-shaped one shown in FIG. 3A so that it can easily rotate in the cylindrical tube 32 without contacting the inner surface of the cylindrical tube. In this case, the diameter D1 of the disk is preferably smaller than the inner diameter D2 of the cylindrical tube 32 and smaller than 2 mm so that the rotation-side magnet 30 can rotate without contact with the inner surface of the cylindrical tube 32. .

  Moreover, as shown in FIG. 4, it is more preferable that the rotation-side magnet 30 has a spherical shape rather than a disk shape. In this case, the boundary line (dotted line X in FIG. 4) between the upper half and the lower half of the spherical shape is the boundary between the N pole and the S pole.

  Thus, by making the rotation-side magnet 30 spherical, even if the rotation-side magnet 30 that rotates together with the rotor 14 contacts the inner surface of the cylindrical tube 32, the contact resistance can be made smaller than when it is disk-shaped. It can be rotated smoothly.

  Further, it is more preferable to coat the inner surface of the rotation side magnet 30 and the cylindrical tube 32 with a slip agent. Thereby, since the contact resistance between the rotation side magnet 30 and the inner surface of the cylindrical tube 32 can be further reduced, the rotor 14 can be rotated more smoothly. As the slip agent, graphite, molybdenum disulfide, polytetrafluoroethylene, or the like can be used.

Next, the operation of the magnetic bearing device 22 of the present invention incorporated in the DC motor 10 will be described.
According to the magnetic bearing device 22 of the present invention configured as described above, the rotating magnet 30 and the bearing magnet 34 are provided at one end of the rotor 14 such that the opposing surfaces have different polarities. The rotation-side magnet 30 is configured to be stored in a non-contact manner in a vertically arranged cylindrical tube 32 surrounded continuously or discontinuously by a bearing-side magnet 34.

  As a result, when the rotation-side magnet 30 provided on the rotor rotation shaft 16 of the rotor 14 is housed inside from the outside of the cylindrical tube 32, the attraction formed by the magnetic lines of force generated by the rotation-side magnet 30 and the bearing-side magnet 34. The rotation-side magnet 30 can be stopped in a floating state at a height position in the cylindrical tube 32 where the force and the repulsive force are balanced.

  That is, the cylindrical tube 32 is surrounded continuously or discontinuously by the bearing-side magnet 34 to form a cylindrical hollow portion 36 at the center of the bearing-side magnet 34, and the cylindrical tube 32 extends to the hollow portion 36. The rotation-side magnet 30 can be suspended in the cylindrical tube 32 in a floating state by arranging the rotation-side magnet 30 having a polarity opposite to the bearing-side magnet 34 in the cylindrical tube 32. it can.

  By the way, when the opposing surfaces of the disk-shaped rotating side magnet 30 and the disk-shaped bearing side magnet (not shown) with no hole in the center are brought close to each other with different polarities, the rotating side magnet 30 and the bearing side An attraction force acts between a magnet (not shown) and the rotation-side magnet 30 and the bearing-side magnet 34 are bonded by magnetic force, so that the magnetic bearing device 22 cannot be constructed.

  However, like the magnetic bearing device 22 of the present invention, as the magnet 34 having the hollow portion 36 at the center as the bearing side magnet 34, the rotating side magnet 30 is interestingly stopped in a floating state in the cylindrical tube 32. Can be made.

  For example, when the magnetic bearing device 22 of the present invention is provided at the upper end portion of the upper and lower end portions of the rotor rotation shaft 16 of the rotor 14 arranged in the vertical direction, the cylindrical tube 32 of the magnetic bearing device 22 has a rotating side. The rotor 14 is suspended in a non-contact manner via the magnet 30. Further, when the magnetic bearing device 22 of the present invention is provided at the lower end portion of the upper and lower end portions of the rotor rotation shaft 16 of the rotor 14 arranged in the vertical direction, the cylindrical tube 32 of the magnetic bearing device 22 is provided with a rotating side. The rotor 14 floats in a non-contact manner via the magnet 30.

  In this state, when the switch 14 of the DC motor 10 is turned on to rotate the rotor 14, the rotor 14 is rotatably supported by the magnetic force of the magnetic bearing device 22. In this case, even if the rotation balance of the rotor 14 is lost and the rotor rotation shaft 16 is tilted, the rotation side magnet 30 is housed in the cylindrical tube 32 so that the balance is not greatly lost. Thereby, the magnetic bearing device 22 for rotating the rotor 14 stably can be constructed.

  In the balance of the rotation side magnet 30 described above, as shown in FIG. 1, the bearing side magnet 34 of the magnetic bearing device 22 disposed at the upper end of the rotor rotating shaft 16 and the magnetic bearing device 22 disposed at the lower end. The polarity of the surface facing the bearing-side magnet 34 is different between the S pole and the N pole. Thus, by making the polarities of the opposed surfaces of the bearing side magnets 34 arranged on the upper end side and the lower end side of the rotor rotation shaft 16 different from each other, the balance of the rotation side magnet 30 is not lost and the stability of the rotor 14 is stabilized. Rotation can be performed.

  Therefore, by using the magnetic bearing device 22 of the present invention as the bearing of the rotor 14 of the DC motor 10, it is possible to configure a bearing in which the bearing portion is hardly worn by the rotation of the rotor 14, so that the magnetic force of the magnet is interesting. It is possible to provide a magnetic bearing device 22 suitable for learning materials and toys for learning the various uses of magnets.

  The explanation of the operation of the magnetic bearing device 22 described above is a case where the rotation-side magnet 30 is used for the rotor rotation shaft 16. However, when a magnetic body is provided on the rotor rotation shaft 16, the shape of the magnetic body is spherical. Preferably there is.

  The reason is that when the magnetic material is a plate shape such as a disk shape, the magnetic material (magnetic material not supported by the rotor rotating shaft 16) is placed horizontally and stored inside the cylindrical tube 32 from the outside. As a result, a floating state is formed in a state where the magnetic body stands by the magnetic force formed in the cylindrical tube 32 by the bearing side magnet 34 (from the horizontal state to the vertical state).

  Thereby, when a plate-shaped magnetic body is provided on the rotor rotation shaft 16, a magnetic force that works from a horizontal state to a vertical state other than the magnetic force that holds the magnetic body in a floating state in the cylindrical tube 32 works. Compared to a spherical magnetic body, the balance during rotation tends to be lost.

  Therefore, it is also possible to stabilize the rotational balance of the magnetic material by adopting a complicated magnetic material shape that cancels the magnetic force that changes the magnetic material from the horizontal state to the vertical state.

  The magnetic bearing device 22 of the present invention is mainly intended for application to teaching materials and toys, but can also be applied as a magnetic bearing device of an actual device used industrially.

  Further, if the magnetic bearing device 22 of the present invention is provided on at least one of the upper and lower end portions of the rotor rotating shaft 16 of the rotor 14, the attractive force and repulsion formed by the magnetic lines of force generated by the rotating side magnet 30 and the bearing side magnet 34. It is possible to observe a scientific phenomenon that the rotation-side magnet 30 is stopped in a floating state at a height position in the cylindrical tube 32 where the force is balanced. Therefore, a scientific phenomenon can be observed if the magnetic bearing device 22 of the present invention is provided on at least one of the upper and lower ends of the rotor rotating shaft 16 of the rotor 14, but both the upper and lower ends of the rotor rotating shaft 16 of the rotor 14 are observed. By providing the magnetic bearing device 22 of the present invention, the scientific phenomenon can be observed more clearly.

[Second Embodiment]
FIG. 5 is an overall configuration diagram of a second embodiment in which the magnetic bearing device 22 of the present invention is incorporated in a DC motor 10 which is an example of a rotating body.

  In the second embodiment, the magnetic bearing device 22 is provided on one end of the rotor rotating shaft 16 and is disposed on the rotating side magnet 30 that rotates together with the rotor 14 and the axis of the rotor rotating shaft 16, and rotates. A longitudinally arranged cylindrical tube 32 that can store the side magnet 30 in a non-contact manner, and a pair of ring-shaped bearing side magnets 34 provided at the upper and lower ends of the cylindrical tube 32, and the rotational side magnet 30 and the pair The polarity of the surface facing the bearing-side magnet 34 is different.

Thus, by providing a pair of ring-shaped bearing side magnets 34 at the upper and lower ends of the cylindrical tube 32, the rotating side magnet 30 can be stopped in the cylindrical tube 32 in a more stable floating state.
The second embodiment is the same as the first embodiment except that a pair of ring-shaped bearing-side magnets 34 are provided at the upper and lower ends of the cylindrical tube 32 (for example, rotation). It is possible to adopt a side magnet having a spherical shape, a coating with a slip agent, or the like.

  Also in the case of the second embodiment, similarly to the first embodiment, the bearing-side magnet 34 of the magnetic bearing device 22 disposed at the upper end of the rotor rotating shaft 16 and the lower end are disposed. By making the polarity of the surface of the magnetic bearing device 22 facing the bearing side magnet 34 different between the S pole and the N pole, the balance of the rotation side magnet 30 is not lost, and the rotor 14 can be stably rotated. .

[Third Embodiment]
FIG. 6 is an overall configuration diagram of a third embodiment in which the magnetic bearing device 22 of the present invention is incorporated in a DC motor 10 which is an example of a rotating body. The magnetic bearing device 22 of the present invention is connected to the rotor rotating shaft 16. This is a case where it is provided only at one end.

  6A, the magnetic bearing device 22 of the present invention is provided only at the upper end portion of the rotor rotating shaft 16, and the lower end portion of the rotor rotating shaft 16 is provided on the rotor rotating shaft 16 as shown in FIG. This is a case where it is inserted into a bearing member 38 having a cylindrical hole having a diameter slightly larger than the diameter (for example, the diameter is larger than 0 mm and larger than 1 mm). The bearing member 38 is supported by the above-described support member (not shown). In this case, it is preferable to coat the cylindrical hole of the bearing member 38 with a slipping agent. In addition, the bearing member 38 is preferably formed of a transparent material so that the support state of the lower end portion of the rotor rotating shaft 16 in the cylindrical hole of the bearing member 38 can be observed.

  Thus, even when the magnetic bearing device 22 of the present invention is provided only at the upper end portion of the rotor rotating shaft 16, the rotor 14 is connected to the cylindrical tube 32 of the magnetic bearing device 22 via the rotation-side magnet 30 as described above. The rotor 14 is suspended without contact, and the rotor 14 rotates in this state. Therefore, the bearing member 38 having the above-described columnar hole can be used without any problem as long as the lower end portion of the rotor rotating shaft 16 is supported so as not to be violated when the rotor 14 rotates.

  Similarly, when the magnetic bearing device 22 of the present invention is provided only at the lower end portion of the rotor rotating shaft 16, the rotor 14 floats in a non-contact manner on the cylindrical tube 32 of the magnetic bearing device 22 via the rotation-side magnet 30. Become. Therefore, the bearing member 38 having the columnar hole described above can be used at the upper end portion of the rotor rotating shaft 16.

In the case of the third embodiment as well, the same preferred modes as in the first embodiment (for example, the rotating side magnet is spherical or a coating with a slipping agent) can be employed.
In the present embodiment, the example in which the rotor 14 of the DC motor 10 is used as the rotating body has been described. However, the present invention is not limited to this.

  The magnetic bearing device of the present invention is suitable as a teaching material or toy that learns the interesting magnetic force of a magnet and considers various uses of the magnet, and has industrial applicability.

  DESCRIPTION OF SYMBOLS 10 ... DC motor, 12 ... Stator, 14 ... Rotor, 16 ... Rotor rotating shaft, 18 ... Commutator, 20 ... Brush, 22 ... Magnetic bearing device, 24 ... Lead wire, 26 ... Battery, 28 ... Switch, 30 ... Rotation Side magnet, 32 ... cylindrical tube, 34 ... bearing side magnet, 34A ... magnet piece, 36 ... hollow portion, 38 ... bearing member

Claims (8)

In a magnetic bearing device that supports at least one end of the upper and lower ends of the rotating shaft of a rotating body arranged vertically in a freely rotatable manner by magnetic force,
A magnetic body provided at one end of the rotating shaft and rotating together with the rotating body;
A vertically disposed cylindrical tube disposed on the axis of the rotating shaft and capable of storing the magnetic body in a non-contact manner;
A magnetic bearing device comprising a bearing-side magnet surrounding the cylindrical tube continuously or discontinuously. In a magnetic bearing device that supports at least one end of the upper and lower ends of the rotating shaft of a rotating body arranged vertically in a freely rotatable manner by magnetic force,
A rotating magnet provided at one end of the rotating shaft and rotating together with the rotating body;
A vertically disposed cylindrical tube disposed on the axis of the rotating shaft and capable of storing the rotating side magnet in a non-contact manner;
A bearing-side magnet surrounding the cylindrical tube continuously or discontinuously,
The magnetic bearing device according to claim 1, wherein polarities of opposing surfaces of the rotation side magnet and the bearing side magnet are different polarities.   The magnetic bearing device according to claim 1, wherein the bearing-side magnet has a ring shape.   4. The magnetic bearing device according to claim 1, wherein a pair of the bearing-side magnets are provided at upper and lower ends of the cylindrical tube. 5.   The magnetic bearing device according to claim 1, wherein the bearing-side magnet is a plurality of magnet pieces that discontinuously surround the cylindrical tube.   The magnetic bearing device according to claim 1, wherein the magnetic body has a spherical shape.   The magnetic bearing device according to claim 2, wherein the rotation-side magnet has a disk shape.   The magnetic bearing device according to claim 2, wherein the rotation-side magnet has a spherical shape.