JP7237537B2 - rotating machine - Google Patents

Description

The present invention relates to rotating machines.

Superconducting rotating machines are characterized by small size, light weight, and high efficiency, and are expected to be applied to automobiles, ships, aircraft motors, wind power generators, and the like. A conventional normal-conducting rotating machine requires an iron core (electromagnetic steel sheet) in order to achieve a high magnetic field strength. The maximum value of the magnetic flux density is determined by the saturation magnetic flux density of iron, which is about 2T. On the other hand, in the case of a superconductor (superconducting wire or superconducting bulk), it is possible to achieve a high magnetic field strength even with an air core (no iron core) because it has zero electrical resistance and can be energized at high current density. . Therefore, the weight is reduced accordingly, and since the magnetic field strength is not restricted by the saturation magnetic flux density of iron, a higher power density can be achieved.
A general configuration of a superconducting rotating machine is a synchronous machine having a field element that generates a direct current magnetic field and an armature that inputs and outputs alternating current. When alternating current is passed through a superconductor, heat generation due to alternating current loss becomes a problem. Therefore, in many cases, only the field magnet, which is a direct current, is made superconducting, and the armature is made of normal conducting (copper). However, if the armature can be made superconducting, the copper loss in the armature can be eliminated and the current density can be increased, so that further increase in power density and efficiency is possible. In recent years, the development of all-superconducting rotating machines, in which both the field element and the armature are superconducting, is progressing due to the technical development of AC loss reduction of superconducting wires.
Superconductors are used in wires and bulks. The field element may be used as an electromagnet by winding a wire into a racetrack shape, or may be bulk-magnetized and used as a permanent magnet. The armature is used as an electromagnet by winding wire in a racetrack shape. Regarding the positional relationship between the field element and the armature, the most common is the radial type in which they are arranged in the radial direction, but some are also considering the axial type in which they are arranged in the axial direction. There are two types of rotating machines: the rotating field type and the rotating armature type. Especially in large machines with large currents, it is technically difficult to rotate the armature, so the rotating field type is common. is.

As an example of a superconducting rotating machine, for example, Patent Document 1 below describes "a power that functions as at least one of a generator that receives mechanical power and generates electric power, or an electric motor that receives electric power and generates mechanical power. Alternatively, the electric power generator comprises: an airtight container arranged inside a heat insulating part and cooled by a refrigerator or a refrigerant; a fixed side member fixed to the airtight container and made superconductive; The airtight container comprises a superconducting motion element that rotates or slides by magnetic action with a side member, and a power transmission mechanism that transmits the motion of the motion element to the outside of the heat insulation section. is filled with a gas that does not liquefy at the operating temperature, and the filling gas enables heat transfer between the airtight container and the rotor." (see claim 1).

JP-A-2004-23921

By the way, when a mechanical bearing is used to support the rotor of a superconducting rotating machine, heat is generated due to sliding, which poses a serious problem at extremely low temperatures. Therefore, Patent Literature 1 describes a configuration in which a superconducting magnetic bearing is used to support a rotor in a non-contact manner. However, support by the superconducting magnetic bearings becomes possible only when the superconductor falls below the critical temperature and becomes superconducting, so the rotor must be supported by some other means at room temperature before cooling. Regarding the support method at room temperature, there is no specific description in Patent Document 1, but as a general non-contact support method that does not use superconductivity, there is a method that uses the repulsive force of a permanent magnet, and a method that uses a plurality of magnetic materials around a magnetic body. A method of supporting by arranging an electromagnet and controlling its attractive force (current) is conceivable.
However, with the former method, it is difficult to stably support the rotor at a desired position. Although the latter method is technically acceptable, it requires a complex control system to detect and feed back the gap, and it requires a large current to levitate a heavy object. There is a problem that power consumption increases because it is necessary to supply power to the inside.
SUMMARY OF THE INVENTION It is an object of the present invention to provide a rotating machine capable of stably supporting a rotor while suppressing power consumption.

In order to solve the above problems, the rotating machine of the present invention includes: a first container that keeps the inside airtight; a second container that is housed inside the first container and keeps the inside airtight; a rotor containing a superconductor housed inside two containers; and a rotor mounted on the rotor, one end of which is supported outside the first container and the other end of which is supported inside the second container. A shaft, a superconducting magnetic bearing that supports the other end of the shaft in a non-contact manner, and a contact support member that supports the other end of the shaft in contact, the first container and the second container is sealed, the state in which the other end of the shaft is contact-supported by the contact support member can be switched to the state in which the other end of the shaft is supported by the superconducting magnetic bearing in a non-contact manner. , the shaft is axially slidable with the first container and the second container sealed, the contact support member being formed on the second container, A fitting portion that fits with the contact support member is formed at the other end, and the superconducting magnetic bearing is axially slidable in a state in which the first container and the second container are sealed. A magnet is provided .

According to the present invention, the rotor can be stably supported while suppressing power consumption.

1 is a cross-sectional view of a superconducting rotating machine according to a first embodiment of the present invention in a stopped state; FIG. 3 is another cross-sectional view of the superconducting rotating machine according to the first embodiment; FIG. 3 is another cross-sectional view of the superconducting rotating machine according to the first embodiment; FIG. FIG. 7 is a cross-sectional view of the superconducting rotating machine according to the second embodiment in a stopped state; FIG. 8 is another cross-sectional view of the superconducting rotating machine according to the second embodiment;

[First embodiment]
<Configuration and operation of the first embodiment>
Hereinafter, the configuration of a superconducting rotating machine 100 (rotating machine) according to a first embodiment of the present invention will be described with reference to the drawings.
Although there are various types of superconducting rotating machines, the most common radial type rotating field type will be described as an example in this embodiment. Also, in the present embodiment, an all-superconducting rotating machine in which both the field element and the armature are made superconducting so as to achieve higher efficiency and higher power density will be described as an example.

FIG. 1 is a cross-sectional view of a superconducting rotating machine 100 according to this embodiment in a stopped state. 2 and 3 are other cross-sectional views of the superconducting rotating machine 100. FIG.
In FIG. 1, a superconducting rotating machine 100 includes a vacuum vessel 1 (first vessel), a cooling vessel 2 (second vessel), a rotor 3 as a field element, a shaft 4, and a stator 5. , a back yoke 6 , a cooling vessel support member 10 , a magnetic fluid seal 11 , a bearing 12 , a support member 13 , a shaft support member 14 (contact support member), and a superconducting magnetic bearing 120 . The superconducting magnetic bearing 120 includes a shaft 7, a superconducting bulk 8, and a permanent magnet 9 (magnet).

Both the rotor 3 which is a field element and the stator 5 which is an armature are housed inside the cooling container 2 . The shaft 4 is formed in a cylindrical shape with closed ends, and the rotor 3 is formed in a cylindrical shape and is fixed to the shaft 4 at its inner circumference. Moreover, the stator 5 is formed in a cylindrical shape surrounding the outer periphery of the rotor 3 and is fixed to the cooling vessel 2 . The rotor 3 is formed by arranging a plurality of coils or superconducting bulks, each having a superconducting wire wound in a racetrack shape, in the circumferential direction according to the number of poles. The stator 5 has a plurality of coils wound in a racetrack shape of superconducting wire arranged in the circumferential direction according to the number of poles and the number of phases.

The superconducting rotating machine 100 functions as a motor when an alternating current is applied to the stator 5 while the rotor 3 is magnetized or magnetized, and functions as a generator when the rotor 3 is rotated by an external force. Wiring for current flow is omitted in the drawing. A cylindrical back yoke 6 is installed on the outer circumference of the stator 5 and on the outer circumference side of the cooling vessel 2 . The back yoke 6 serves to confine the magnetic field generated by the stator 5 inside. Regarding the cooling method of the rotor 3 and the stator 5, the simplest method is to fill the inside of the cooling container 2 with a refrigerant, and this embodiment also adopts this method. Refrigerant and pipes for supplying and discharging the refrigerant are not shown in the drawing.

The coolant to be used includes liquid or gaseous helium, hydrogen, neon, nitrogen, etc., and may be selected according to the critical temperature of the superconducting material to be used. For the rotor 3, stator 5, etc., it is desirable to apply a high-temperature superconducting material such as an oxide system (rare earth system, bismuth system) or MgB ₂ (magnesium diboride). It is also possible to cool the cooling container 2 with a refrigerator in order to reduce the amount of refrigerant used. Further, although the liquid refrigerant has a large cooling capacity, it has a large windage loss due to friction with the rotating body. Therefore, only the stator may be cooled with the liquid refrigerant, and the rotor may be cooled with the gas refrigerant. The cooling vessel 2 is fixed to the vacuum vessel 1 via a cooling vessel support member 10 in order to insulate it from room temperature.

Since the shaft 4 to which the rotor 3 is attached is a portion for inputting and outputting torque, a portion of the shaft 4 protrudes outside the vacuum vessel 1 in this embodiment. Here, it is also conceivable to employ a configuration in which the shaft 4 is mechanically separated inside and outside the vacuum vessel 1 and magnetically coupled. However, from the viewpoint of ensuring durability and reliability against large torque, it is desirable to project the shaft 4 to the outside of the vacuum vessel 1 as described above. The shaft 4 has a hollow structure and the inside is evacuated in order to suppress heat penetration from room temperature. A magnetic fluid seal 11 is attached to the vacuum vessel 1 at the exposed portion of the shaft 4 in order to seal the coolant in the cooling vessel 2 against the rotating shaft 4 .

A support member 13 is attached to the vacuum vessel 1 around the magnetic fluid seal 11 , and a bearing 12 is attached to the support member 13 . The bearing 12 is a normal mechanical bearing such as a rolling bearing, and supports the left end of the shaft 4 rotatably. The right end of the shaft 4 can also be supported by a low-temperature ceramic bearing or the like. However, in this embodiment, the right end portion of the shaft 4 is supported in a non-contact state by the superconducting magnetic bearing 120 from the viewpoint of heat generation and durability due to sliding. It should be noted that the right end of the shaft 4 can also be protruded outside the vacuum vessel 1 by using the magnetic fluid seal 11 in the same manner as the left end. However, since the magnetic fluid seal 11 has a large loss, it is preferable to support one end (right end) at a low temperature without contact as in the present embodiment.

A superconducting magnetic bearing generally comprises a superconducting bulk and permanent magnets. A superconducting coil may be applied instead of the superconducting bulk, and an electromagnet may be applied instead of the permanent magnet, but from the viewpoint of manufacturability, it is preferable to apply the superconducting bulk and the permanent magnet. Therefore, the superconducting magnetic bearing 120 in this embodiment includes the superconducting bulk 8 and the permanent magnets 9 as described above. The superconducting bulk 8 is cooled while receiving the magnetic field from the permanent magnet 9, and when the superconducting bulk 8 becomes superconducting, a force acts to maintain the magnetic field. It can be supported in a non-contact manner.

In this embodiment, the shaft 7 is attached to the right end of the shaft 4 so as to extend the shaft 4 . Further, a ring-shaped superconducting bulk 8 is attached to the shaft 7 . A permanent magnet 9 formed in an annular shape is arranged on the outer peripheral side of the superconducting bulk 8 with the cooling vessel 2 and the vacuum vessel 1 interposed therebetween. The superconducting bulk 8 is preferably made of a material with high thermal conductivity, such as copper or aluminum, so that it can be cooled by heat transfer from the shaft 7 .

In this embodiment, the permanent magnets 9 are arranged outside the superconducting bulk 8, but the positional relationship between the two may be reversed. However, since it is technically difficult to fabricate a large superconducting bulk, it is preferable to dispose the superconducting bulk 8 inside as in the present embodiment. Further, in this embodiment, the permanent magnets 9 are arranged outside the vacuum vessel 1 . Here, the shorter the distance between the permanent magnet 9 and the superconducting bulk 8, the more electromagnetic force that supports the shaft 7 can be secured.

Therefore, from the viewpoint of securing the electromagnetic force, it is conceivable to dispose the permanent magnet 9 inside the vacuum vessel 1 or inside the cooling vessel 2, and in fact such an arrangement can be employed. However, from the standpoint of manufacturability, it is easier to fabricate by arranging it outside the vacuum vessel 1 rather than fixing it inside the vacuum vessel 1 or the cooling vessel 2 . Therefore, it is preferable to determine the arrangement of the permanent magnets 9 in consideration of ensuring the above-described electromagnetic force and ease of manufacture.

The superconducting magnetic bearing 120 generates an electromagnetic force to support the shaft 7 only after the superconducting bulk 8 is cooled and becomes superconducting. Therefore, a separate means for supporting the shaft 7 at room temperature is required. In this embodiment, the shaft support member 14 is installed in the cooling container 2 to enable support at room temperature. The shaft support member 14 has a structure that allows free movement in the axial direction with respect to the cooling vessel 2 but restricts rotation in the circumferential direction. The end portion of the shaft 7 facing the shaft support member 14 is formed with a recess 7a (fitting portion) that is recessed in a cylindrical shape. Further, the shaft support member 14 has a convex portion 14a that protrudes in a columnar shape on the surface facing the concave portion 7a.

A female thread is threaded on the peripheral wall of the recess 7a, and a male thread is threaded on the peripheral wall of the projection 14a. In the state shown in FIG. 1, the concave portion 7a and the convex portion 14a are screwed together. As described above, since the shaft support member 14 has a structure that restricts circumferential rotation, the circumferential rotation of the shafts 4 and 7 is also restricted by screwing the concave portion 7a and the convex portion 14a together. be done. By rotating the shafts 4 and 7, the shaft 7 can be attached to and detached from the shaft support member 14. As shown in FIG.

In this embodiment, the shaft 7 is provided with the concave portion 7a and the shaft support member 14 is provided with the convex portion 14a. may As shown in FIG. 1, before cooling, the shaft 7 and the shaft support member 14 are inserted into the cooling vessel 2 in a state of being coupled. Further, the axial movement of the shaft 4 is restricted by the bearing 12 . Therefore, when the shafts 4 and 7 are rotated in the direction in which the shaft support member 14 is removed after the vacuum container 1 and the cooling container 2 are sealed and cooled, the shaft support member 14 moves in the axial direction and is removed from the shaft 7. . At this point, the shaft 7 is supported non-contactingly with respect to the cooling vessel 2 . However, if the shaft 7 and the shaft support member 14 are close to each other, the shaft 7 and the shaft support member 14 may come into contact with each other due to vibration during rotation.

Therefore, in this embodiment, as shown in FIG. 2, the shaft 7 and the shaft support member 14 are sufficiently spaced apart. The details are described below. First, in the present embodiment, the material of the shaft support member 14 contains a magnetic material at least in part. The superconducting rotating machine 100 also includes a magnet holder 16 which is detachably attached to the right end of the vacuum vessel 1 and a permanent magnet 15 fixed to the magnet holder 16 . Thereby, as shown in FIG. 2, the shaft support member 14 is attracted to the permanent magnet 15 and can be fixed at a position away from the shaft 7 .

When the temperature of the superconducting rotating machine 100 is increased after the operation of the superconducting rotating machine 100 is finished, the superconducting magnetic bearing 120 loses its supporting force when the superconducting bulk 8 becomes normal conducting. At that time, if the shaft 7 and the shaft support member 14 remain in a non-contact state, the shaft 7 will drop. In order to prevent this, the permanent magnet 15 is used to couple the shaft support member 14 and the shaft 7 before the temperature of the superconducting rotating machine 100 is increased.

The details are shown in FIG. In FIG. 3, the permanent magnet 15 and the magnet holder 16 are pushed leftward from the state shown in FIG. As a result, the shaft support member 14 also moves leftward together with the permanent magnet 15 . When the shafts 4 and 7 are rotated in this state, the concave portion 7a and the convex portion 14a are screwed together again, and the shaft 7 and the shaft support member 14 are coupled.

In the illustrated example, the permanent magnets 9 for bearing and the permanent magnets 15 for position control are integral bodies formed in an annular shape, but the permanent magnets 9 and 15 are not limited to integral bodies. do not have. That is, in order to increase the magnetic gradient around the permanent magnets 9 and 15 and obtain a greater electromagnetic force, the permanent magnets 9 and 15 are divided along the axial direction and the same poles of the divided pieces are joined together. It is desirable to devise If whirling occurs when the shaft 7 is rotated while being supported in a non-contact manner by the superconducting magnetic bearings 120, the above-mentioned "position control using the attractive force of the electromagnet" should be employed as an auxiliary method. is valid. For this purpose, the shaft 7 should be partially made of a magnetic material.

<Effect of the first embodiment>
As described above, according to the rotating machine (100) of the present embodiment, while the first container (1) and the second container (2) are sealed, the other ends of the shafts (4, 7) are A state in which one end of the shafts (4, 7) is supported in contact with the contact support member (14) can be switched to a state in which the other end of the shaft (4, 7) is supported in a non-contact manner by the superconducting magnetic bearing (120).
Thus, in a state in which the other ends of the shafts (4, 7) are contact-supported by the contact support member (14), the rotor (3) can be stably supported while suppressing power consumption. For example, it is possible to switch from contact support using the contact support member (14) at room temperature to non-contact support using the superconducting magnetic bearing (120) at low temperature, reducing mechanical losses. , high efficiency of the rotating machine (100) can be realized.

Furthermore, according to the present embodiment, the other ends of the shafts (4, 7) are attached to the superconducting magnetic bearing (120) while the first container (1) and the second container (2) are sealed. The non-contact supported state can be switched to a state in which the other ends of the shafts (4, 7) are contacted and supported by the contact support member (14).
This makes it possible to stably support the rotor (3) while further suppressing power consumption.

Furthermore, according to the present embodiment, a projection (14a) formed on one of the contact support member (14) or the shaft (4, 7) and having an external thread, and the contact support member (14) or the shaft (4, 7) 7), the contact support member (14) is formed in the other side of the shaft (4, 7) and has a female thread that is screwed into the protrusion (14a). It is housed in the second container (2) in a state where it is restrained from movement and movable in the axial direction of the shafts (4,7).
Thereby, the contact support member (14) can stably support the shafts (4, 7) while suppressing the rotation of the shafts (4, 7).

Furthermore, according to this embodiment, the contact support member (14) is characterized by having a magnetic material at least in part.
As a result, when the shafts (4, 7) are supported by the superconducting magnetic bearings (120), the contact support member (14) can be sufficiently separated from the shafts (4, 7) using the permanent magnets 15 or the like. can be done.

[Second embodiment]
<Configuration and operation of the second embodiment>
Next, the configuration of a superconducting rotating machine 200 (rotating machine) according to a second embodiment of the present invention will be described. In addition, in the following description, the same code|symbol may be attached|subjected to the part corresponding to each part of 1st Embodiment mentioned above, and the description may be abbreviate|omitted.
In the above-described first embodiment, the shaft support member 14 (see FIG. 1) serves as a movable portion, and switches the contact/non-contact support of the shaft 7 . With this configuration, switching between contact/non-contact support of the shaft 7 can be realized with a simple structure. However, since the shaft support member 14 cannot be visually recognized from the outside of the container, it is difficult to determine the state of contact/non-contact support of the shaft 7 from the outside. Therefore, in the present embodiment, the contact/non-contact support of the shaft 7 can be easily determined.

FIG. 4 is a cross-sectional view of the superconducting rotating machine 200 according to the second embodiment of the present invention in a stopped state.
In FIG. 4, the shafts 4 and 7 and the rotor 3 in this embodiment can be slid in the horizontal direction in the figure as a unit. The state of FIG. 4 shows a state in which the shafts 4 and 7 and the rotor 3 are slid to the right end of the movable range. A columnar shaft support member 19 (contact support member) protrudes toward the shaft 7 at a position facing the shaft 7 at the right end of the cooling container 2 in the drawing. At the right end of the shaft 7, a recess 7b having a substantially cylindrical shape is formed at a position facing the shaft support member 19. As shown in FIG.

In the state shown in FIG. 4, the shaft support member 19 is fitted in the recess 7b to restrict the shaft 7 from shaking. The left end of the shaft 4 is rotatably supported by a bearing 12 and a magnetic fluid seal 11, as in the first embodiment. However, since the mounting position of the magnetic fluid seal 11 with respect to the shaft 4 is fixed, in this embodiment, the magnetic fluid seal 11 is configured to slide in conjunction with the sliding of the shaft 4 .

More specifically, the magnetic fluid seal 11 in this embodiment is attached to the vacuum vessel 1 by an extendable support member 17 . The support member 17 is extendable and has the function of sealing the coolant. As the supporting member 17, for example, a welded bellows made of stainless steel may be applied. As shown in FIG. 4, at room temperature, the support member 17 is in a contracted state, whereby the shafts 4 and 7 are pressed against the cooling vessel 2 and supported while being in contact with the cooling vessel 2 .

FIG. 5 is a cross-sectional view of superconducting rotating machine 200 in a cooled state.
As shown in FIG. 5, after cooling, the support member 17 is extended, and the shafts 4 and 7 are separated from the cooling container 2 to be in a non-contact support state. In many cases, the extendable support member 17 cannot be expected to have mechanical strength. Therefore, in this embodiment, the bearing 12 is supported by a support member 18 such as a mechanically strong and expandable linear bushing. Further, it is preferable to fix the axial positions of the shafts 4 and 7 when the shafts 4 and 7 are not driven. Therefore, in this embodiment, a support member 13 having a fixed length is also provided, as in the first embodiment described above.

In the example shown in FIGS. 4 and 5, the cooling container 2 is formed with a shaft support member 19 which is a convex portion, and the shaft 7 is formed with a concave portion 7b to be fitted thereto. However, the shaft 7 may be formed with a convex portion, and the cooling container 2 may be formed with a concave portion to fit the convex portion. At least one of the shaft support member 19 and the concave portion 7b is tapered so that the shafts 4 and 7 are easily returned to the contact support state when the temperature of the superconducting rotating machine 200 is increased from the cooling state. It is preferable to keep

Further, when the shafts 4 and 7 are slid while the superconducting rotating machine 200 is cooled, a force is also generated in the axial direction in the superconducting magnetic bearing 120, so a large force is required to slide the shafts 4 and 7. Become. Therefore, it is preferable to configure the permanent magnet 9 so that it can also slide in the axial direction. The permanent magnet 9 may be arranged inside the vacuum vessel 1 or inside the cooling vessel 2 . However, in this embodiment, the permanent magnets 9 are arranged outside the vacuum vessel 1 in view of ease of manufacture. That is, the magnet holder 16 in this embodiment has a permanent magnet 9 that is part of the superconducting magnetic bearing 120 and is slidable in the axial direction at the right end of the vacuum vessel 1 .

<Effect of Second Embodiment>
As described above, according to the rotating machine (200) of the present embodiment, the shafts (4, 7) are arranged in a state in which the first container (1) and the second container (2) are sealed. A contact support member (19) is formed in the second container (2), and a fitting portion ( 7b) are formed.
Thus, the contact support member (19) can stably support the shafts (4, 7) by fitting the contact support member (19) with the fitting portion (7b).

Furthermore, according to the present embodiment, since the contact support member (19) or the fitting portion (7b) is tapered, they can be smoothly fitted together.
Furthermore, according to this embodiment, the superconducting magnetic bearing (120) is a magnet (9) that can slide axially while the first container (1) and the second container (2) are sealed. Prepare. This allows the shafts (4, 7) to slide smoothly while suppressing the force applied from the superconducting magnetic bearing (120).

[Modification]
The present invention is not limited to the embodiments described above, and various modifications are possible. The above-described embodiments are illustrated for easy understanding of the present invention, and are not necessarily limited to those having all the described configurations. Also, part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. Also, it is possible to delete part of the configuration of each embodiment, or to add or replace other configurations. Possible modifications to the above embodiment are, for example, the following.

(1) In each of the above-described embodiments, an example in which the present invention is applied to a radial-type all-superconducting rotating machine in which both the field element and the armature are superconducting has been described. However, the rotating machine of the present invention is not limited to the one described above. may apply. Also, the field element or armature does not necessarily have to be superconducting.

1 vacuum container (first container)
2 cooling container (second container)
3 rotors 4, 7 shaft 7a concave portion (fitting portion)
7b recess 9 permanent magnet (magnet)
14, 19 shaft support member (contact support member)
14a Convex portion 100, 200 Superconducting rotating machine (rotating machine)
120 superconducting magnetic bearings

Claims (4)

a first container that keeps the interior airtight;
a second container housed inside the first container and keeping the inside airtight;
a rotor housed inside the second container and containing a superconductor;
a shaft mounted on the rotor and having one end supported outside the first container and the other end supported inside the second container;
a superconducting magnetic bearing that supports the other end of the shaft in a non-contact manner;
a contact support member that contacts and supports the other end of the shaft;
with
In a state in which the first container and the second container are sealed and the other end side of the shaft is supported in contact with the contact support member, the other end side of the shaft contacts the superconducting magnetic bearing. configured to be switchable to a non-contact supported state ,
the shaft is slidable in the axial direction while the first container and the second container are sealed;
the contact support member is formed in the second container;
A fitting portion that fits with the contact support member is formed at the other end of the shaft,
The superconducting magnetic bearing includes a magnet that is axially slidable while the first container and the second container are sealed.
A rotating machine characterized by: In a state in which the first container and the second container are hermetically sealed, the other end of the shaft is supported by the superconducting magnetic bearing in a non-contact manner, and the other end of the shaft is supported by the contact support member. 2. The rotating machine according to claim 1, wherein the rotating machine is configured to be switchable to a state in which it is supported in contact with. a first container that keeps the interior airtight;
a second container housed inside the first container and keeping the inside airtight;
a rotor housed inside the second container and containing a superconductor;
a shaft mounted on the rotor and having one end supported outside the first container and the other end supported inside the second container;
a superconducting magnetic bearing that supports the other end of the shaft in a non-contact manner;
a contact support member that contacts and supports the other end of the shaft;
with
In a state in which the first container and the second container are sealed and the other end side of the shaft is supported in contact with the contact support member, the other end side of the shaft contacts the superconducting magnetic bearing. configured to be switchable to a non-contact supported state,
a convex portion formed on one of the contact support member or the shaft and having a male screw;
a concave portion formed in the other of the contact support member or the shaft and having a female thread screwed into the convex portion;
further having
The rotating machine, wherein the contact support member is housed in the second container in a state in which movement in the circumferential direction of the shaft is restricted and the contact support member is movable in the axial direction of the shaft. The rotating machine according to claim 3, wherein the contact support member has a magnetic material at least in part.

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