JP4661263B2 - Superconducting motor device - Google Patents

Description

  The present invention relates to a superconducting motor device, and more particularly to a cooling structure for a high-output motor that is used as a driving source for vehicles, ships, and the like and uses a superconducting coil.

  In recent years, in order to improve the exhaustion of fossil fuels such as gasoline and the deterioration of the environment due to exhaust gas, the development of electric vehicles and hybrid vehicles that run by driving a motor with electric energy has been promoted. In this case, when a normal conducting motor is used, there is a problem that copper loss occurs due to electrical resistance, resulting in low efficiency and a difficulty in increasing output because of a limit in the energization current. On the other hand, if a superconducting motor as disclosed in JP-A-6-6907, JP-A-5-276734, JP-A-6-284690, or JP-A-7-87724 is employed, a superconducting coil is used. The copper loss is eliminated, the efficiency is increased, and the size and output can be reduced.

In a superconducting motor, the superconducting coil must be cooled to a very low temperature in order to exhibit the required superconducting performance, and the cooling method is mainly a gas that fills a cooling gas in a heat insulating container containing a rotor or the like. Three patterns of cooling, immersion cooling in which a heat insulating container is filled with liquid, and conduction cooling using a heat conductive medium such as metal are conceivable.
Among these, gas cooling does not provide rotational resistance to the rotor rotating in the heat insulating container because the refrigerant is a gas, but gas has a problem of poor cooling efficiency because it has a smaller heat capacity than liquid.
In addition, the immersion cooling uses a liquid as a refrigerant and thus has a good cooling efficiency, but has a problem that the rotational resistance increases because the rotor rotates in the liquid.
Furthermore, conduction cooling requires that the metal that is the heat transfer medium is brought into mechanical contact with the object to be cooled, so frictional heat is generated between the rotating object and the fixed object, resulting in increased loss and a complicated contact structure. There is a problem of becoming.
JP-A-6-6907 Japanese Patent Application Laid-Open No. 5-276734 JP-A-6-284690 JP-A-7-87724

  The present invention has been made in view of the above problems, and an object of the present invention is to propose a cooling structure for a superconducting motor with a simple structure, good cooling efficiency, and low rotational resistance of the rotor.

In order to solve the above-mentioned problems, the present invention attaches a superconducting coil formed of a superconducting material to a rotor that connects a rotating shaft , and arranges the rotor and the rotating shaft in a heat insulating container, and the heat insulating container surrounds the rotor. A main body part, a cylindrical part protruding in a horizontal direction from a side surface of the main body part, and a bearing part that rotatably penetrates the rotating shaft on a tip side of the cylindrical part, and at least a bottom surface side of the cylindrical part is A tapered surface inclined downward toward the main body, and
A liquid refrigerant is stored in a lower part of the heat insulating container, a part of the rotor is immersed in the liquid refrigerant, and the liquid refrigerant is scattered in the heat insulating container by the rotation of the rotor. A superconducting motor device is provided.

With the above configuration, the liquid refrigerant stored in the lower part of the heat insulating container is splashed up by the rotation of the rotor and diffused in the form of mist in the heat insulating container. Therefore, the cooling efficiency can be kept good. Further, since the liquid refrigerant is stored only in the lower part of the heat insulating container and only a part of the rotor is immersed in the liquid refrigerant, the resistance when the rotor is rotated by the liquid refrigerant can be suppressed.
The level of the liquid hydrogen stored in the heat insulating container is preferably lower than the rotation axis when the rotor is stopped, and more preferably when the level is 15% to 40% of the rotor diameter from the lower end of the rotor. . As the superconducting material, it is preferable to use a high-temperature superconducting material such as bismuth or yttrium. In addition, it is preferable to use liquid nitrogen or the like as the liquid refrigerant.

It is preferable that a protrusion or groove for promoting scattering of the liquid refrigerant is formed in a part of the rotor.
That is, by providing the protrusions or grooves as in the above-described configuration, the liquid refrigerant can be easily splashed when the rotor rotates, so that fog can be efficiently generated in the heat insulating container. The protrusions or grooves are preferably formed on the outer peripheral surface of the rotor.

A nozzle connected to a tank for storing the liquid refrigerant is installed at the top of the heat insulating container, and a gas discharge port is provided in the heat insulating container.
It is preferable that the liquid refrigerant is supplied from the nozzle into the heat insulating container, and the temperature-evaporated refrigerant is discharged from the gas discharge port.

With the above-described configuration, a predetermined amount of liquid refrigerant can be replenished from the nozzle as the refrigerant vaporized by heat exchange with the superconducting coil is discharged from the gas discharge port and the liquid refrigerant in the heat insulating container is reduced. . Further, since the nozzle is provided in a heat insulating container that is a non-rotating object, piping connected to the nozzle can be easily connected, and the cooling structure can be simplified.
The gas outlet may be configured to be liquefied and reused by connecting to the reliquefaction means, or may be discharged to the atmosphere if the refrigerant gas is safe.

  Preferably, the nozzle is a spray nozzle, and the liquid refrigerant is sprayed from the spray nozzle to replenish the heat-insulating container while directly cooling the rotor.

  With the above configuration, when the liquid refrigerant is replenished according to the decrease in the liquid refrigerant in the heat insulating container, the refrigerant is sprayed from above by spraying, so that the inside of the heat insulating container is combined with the atomization by the rotor rotation. It is possible to fill with refrigerant mist.

As described above, the heat insulating container at least penetrates the rotating shaft at the main body portion surrounding at least the rotor, the cylindrical portion protruding in the horizontal direction from the side surface of the main body portion, and the distal end side of the cylindrical portion. A bearing portion,
At least the bottom side of the tubular portion that has a tapered surface which is inclined downwardly toward the body portion.

  With the above configuration, a cylindrical portion is interposed between the main body portion and the bearing portion, and a distance is taken in the horizontal direction, and even if there is heat intrusion from the bearing portion, the heat insulation distance is earned by the presence of the cylindrical portion. Therefore, the heat insulation performance can be improved. Even when droplets that have entered the cylinder from the main body adhere to the inner wall of the cylinder, the bottom of the cylinder is tapered, so that it can be returned to the main body by its own weight along the slope. it can. Furthermore, since the bearing portion may be a gas seal and does not need to be a liquid seal, the requirement for sealing performance is alleviated and the friction with the rotating shaft can be reduced.

  It is preferable that a rotation shielding plate is externally fixed to the rotation shaft positioned in the cylinder part with a gap from the inner wall of the cylinder part.

  If it is set as the said structure, the space of a cylinder part can be divided | segmented by a rotation shielding board, the gas can be suppressed inside a cylinder part as much as possible by suppressing the convection of gas. Therefore, the gas that fills the cylindrical portion can exhibit a heat insulating action and reduce heat intrusion along the rotation axis. Note that gas has a much smaller heat capacity than liquid and is suitable for reducing heat loss.

  A fixed shielding plate for closing the flow path of the cylindrical portion is attached to the cylindrical portion, and a through hole for loosely fitting the rotating shaft is provided at the center of the fixed shielding plate, and at the lower end of the fixed shielding plate It is preferable that the communication hole is notched.

  If it is set as the above-mentioned composition, since the space of a cylinder part is divided by a fixed shielding board and gas convection is controlled, the heat penetration along a rotation axis can be reduced by the heat insulation action of gas which fills a cylinder part. Further, even when a liquid droplet that has entered the cylindrical portion adheres to the inner wall and accumulates, it can be returned to the main body portion through the communication hole.

It is preferable that the rotation shielding plate and the fixed shielding plate are alternately arranged in the axial direction.
With the above configuration, a gap is provided between the inner wall of the cylindrical portion on the outer peripheral side of the rotary shielding plate, but the gap can be blocked by the adjacent fixed shielding plate, so that the gas present in the cylindrical portion is It becomes difficult to move further in the axial direction, and the heat insulation can be further improved.

In addition, a rotating blade is fitted on and fixed to the rotating shaft located in the cylindrical portion with a gap from an inner wall of the cylindrical portion, and a stationary blade that closes the flow path of the cylindrical portion is cylindrical. Attached to the inner wall of the
A through hole for loosely fitting the rotating shaft is provided at the center of the stationary blade, and a communication hole is notched at the lower end of the stationary blade, and the moving blade and the stationary blade are alternately arranged in the axial direction. Placed in
The moving blades and the stationary blades are grouped and attached to a first group disposed on the main body portion side and a second group disposed on the bearing portion side,
The first group arranges the moving blades and the stationary blades so that the flow direction faces the main body portion, while the second group arranges the moving blades and the stationary blades such that the flow direction faces the bearing portion side. Is also preferable.

  That is, using the structure of the known turbine blades and stationary blades of the turbine, the gas on the main body side of the cylindrical portion is pushed out to the main body portion by the action of the first group of blades and stationary blades, while the second group of blades Since the gas on the bearing portion side of the cylindrical portion is pushed out to the bearing portion by the action of the stationary blade, the gas between the first group and the second group is exhausted to both sides to be in a substantially vacuum state. It can be improved dramatically.

Further, as a specific structure of the superconducting motor device, a stator is disposed oppositely with a necessary gap in the axial direction of the rotor,
The rotation shaft fixed to the rotor passes through the stator rotatably,
It is preferable that an axial gap structure is used in which the magnetic flux direction of the coils attached to the rotor and the stator is arranged in the axial direction.
Alternatively, a stator that surrounds the outer peripheral side of the rotor with a required gap is provided,
It is also preferable as a radial gap structure in which the magnetic flux direction of the coils attached to the rotor and the stator is arranged in the radial direction.

  As is clear from the above description, according to the present invention, the liquid refrigerant stored in the lower part of the heat insulating container is scattered by the rotation of the rotor and diffused in the form of a mist in the container. It is cooled by droplets having a large heat capacity, and the cooling efficiency can be kept good. Further, since the liquid refrigerant is stored in the lower part of the heat insulating container, only a part of the rotor is immersed in the liquid refrigerant, so that the resistance due to the liquid refrigerant when the rotor rotates can be suppressed. Furthermore, a cooling structure can be simplified by making the heat insulation container which stores a liquid refrigerant into a non-rotating thing.

Embodiments of the present invention will be described with reference to the drawings.
1 to 3 show a superconducting motor device 10 having an axial gap structure according to the first embodiment.
The superconducting motor device 10 has a pair of stators 11 and 12 facing each other in the axial direction of a rotor 13 fixed to a horizontal rotating shaft 15 and a heat insulating container 14 surrounding the rotor 13. .

  The stators 11 and 12 have symmetrical plate shapes, and armature coils made of a normal conducting material (for example, copper) at equal intervals in the circumferential direction on the rotor facing surface side of the yokes 16 and 18 made of a magnetic material. 17 and 19 are embedded, and the armature coils 17 and 19 are arranged so that the magnetic flux directions of the armature coils 17 and 19 face the axial direction. In the hollow portions of the armature coils 17 and 19, flux collectors 16a and 18a continuous with the yokes 16 and 18 are arranged. At the center of the yokes 16 and 18, through holes 16 a and 18 a are formed so as to pass through a cylindrical portion 23 of the heat insulating container 14 described later. The armature coils 17 and 19 are configured to be supplied with required power from a power source (not shown).

  The rotor 13 penetrates and fixes the rotary shaft 15 to the center of the disk-shaped yoke 20, and is provided with coil attachment holes 20a at equal intervals in the circumferential direction, and a plurality of field magnets made of superconducting material are provided in the coil attachment holes 20a. The coil 21 is embedded and arranged such that the magnetic flux direction of the plurality of field coils 21 faces the axial direction. A flux collector 32 made of a magnetic material is disposed in the hollow portion of each field coil 21. Further, as shown in FIG. 2, protrusions 20 b are provided on the outer peripheral surface of the yoke 20 at a predetermined interval in the circumferential direction.

  Magnetic materials such as permender, silicon steel plate, iron and permalloy are used for the materials of the yokes 16, 18 and 20. Further, as the superconducting material forming the field coil 21, a high temperature superconducting material such as bismuth or yttrium is used. The armature coils 17 and 19 and the field coil 21 are configured to receive required power from a power source (not shown). The armature coils 17 and 19 and the field coil 21 have the same radial distance from the axis of the rotary shaft 15.

  The heat insulating container 14 has a vacuum heat insulating structure, and has a main body portion 22 having a circular cross section surrounding the rotor 13, a cylindrical portion 23 protruding in the horizontal direction from the side surface of the main body portion 22, and the rotating shaft 15 at the tip side of the cylindrical portion 23. The bearing part 24 penetrates rotatably. The cylindrical portion 23 is formed in a tapered shape that is reduced in diameter from the main body portion 22 side toward the bearing portion 24 side, thereby forming a tapered surface that is inclined downward toward the main body portion 22 on the bottom surface side.

  A nozzle 27 connected to a liquid nitrogen tank 25 that stores liquid nitrogen serving as a refrigerant is installed on the upper surface of the heat insulating container 14, and a gas discharge port 22 a that discharges vaporized nitrogen is provided. Supply control means 26 for controlling the discharge amount of liquid nitrogen from the nozzle 27 is interposed in the heat insulating supply pipe 30 connecting the nozzle 27 and the tank 25. Further, a gas suction means 28 and a liquefaction means 29 are interposed in the heat insulation return pipe 31 that connects the gas discharge port 22 a and the tank 25.

Next, the operation of the superconducting motor device 10 will be described.
First, a predetermined amount of liquid nitrogen stored in the liquid nitrogen tank 25 is discharged from the liquid nozzle 27, and the liquid nitrogen R is stored in the lower portion of the main body portion 22 of the heat insulating container 14.
At this time, the liquid surface position of the liquid nitrogen R is set to be lower than the rotation shaft 15. When the liquid surface height from the lower end of the rotor 13 is H and the rotor diameter is D, the rotor 13 is in a stopped state. = 0.15D to 0.4D.
Next, as shown in FIG. 3, when the rotor 13 is rotated by supplying power to the armature coils 17 and 19 and the field coil 21, the protrusion 20 b jumps up the liquid nitrogen R as the rotor 13 rotates, and the heat insulating container The liquid nitrogen R is diffused in the form of mist-like droplets Ra. The field coil 21 (superconducting coil) of the rotor 13 is cooled to a cryogenic temperature by the mist-like droplet Ra, and the field coil 21 is energized in a superconducting state.

At this time, for example, when a bismuth-based superconducting wire is used as the superconducting material of the field coil 21, since the sheath uses silver, a current can flow to some extent even at room temperature, so that the entire coil has a superconducting temperature. Even if not, the state of FIG. 3 can be created by rotating the rotor 13 by the normal conducting current.
In addition, once the field coil 21 is cooled to the liquid nitrogen temperature and is in a superconducting state, the field coil 21 itself hardly generates heat, so there is no temperature rise, and the liquid level of the liquid nitrogen R is higher than that of the field coil 21. Even if it goes down, the temperature does not rise suddenly, and the superconducting state does not collapse.

  Further, when the liquid nitrogen R is vaporized by heat exchange with the field coil 21 and becomes nitrogen gas, it is discharged from the gas discharge port 22a by the gas suction means 28 and reliquefied to liquid nitrogen by the liquefying means 29. And returned to the liquid nitrogen tank 25. When the amount of liquid nitrogen in the heat insulating container 14 decreases, an appropriate amount of liquid nitrogen is supplied from the nozzle 27 by the supply control means 26 into the heat insulating container 14.

Further, even if the liquid Ra droplets Ra enter the cylindrical portion 23 of the heat insulating container 14 and adhere to the inner wall of the cylindrical portion 23, the cylindrical portion 23 is tapered, so the droplet Ra follows the inclination. Returned to the main body 22.
In addition to liquid nitrogen R, liquid neon, liquid helium, or the like may be used as the liquid refrigerant. Further, instead of the protrusion 20b provided on the outer peripheral surface of the rotor 13, a groove may be provided on the outer periphery of the yoke 20, or both the protrusion and the groove may be provided.

FIG. 4 shows a second embodiment.
The difference from the first embodiment is that the nozzle installed in the upper part of the heat insulating container 14 is a spray nozzle 27 ′.
With the above configuration, the liquid nitrogen R is sprayed from the spray nozzle 27 ′ before the rotor 13 is rotated, and the field coil 21 is cooled to the liquid nitrogen temperature, and then the rotor 13 can be rotated. The coil 21 can be energized in the superconducting state from the beginning. Since other configurations are the same as those of the first embodiment, the same reference numerals are given and description thereof is omitted.

FIG. 5 shows a reference third embodiment.
The difference from the first embodiment is that the armature coils 47 and 49 of the stators 41 and 42 are also superconducting coils, and the heat insulating container 43 accommodates both the stators 41 and 42 and the rotor 13.

That is, the armature coils 47 and 49 attached to the yokes 46 and 48 of the stators 41 and 42 are made of a superconducting material. Further, the main body 42 of the heat insulating container 43 accommodates both the stators 41 and 42 and the rotor 13. A cylindrical portion 45 having a reduced diameter projects from the side surface of the main body portion 42 on both sides in the horizontal direction, and a bearing portion 46 that penetrates the rotary shaft 15 is provided at the tip.
With the above configuration, when the liquid nitrogen R diffuses into the heat insulating container 43 by the rotation of the rotor 13, both the field coil 21 and the armature coils 47 and 49 are cooled to the liquid nitrogen temperature, and the superconducting state is achieved. Secured.
Since other configurations are the same as those of the first embodiment, the same reference numerals are given and description thereof is omitted.

FIG. 6 shows a fourth embodiment.
The difference from the first embodiment is that the superconducting motor device 50 has a radial gap structure.

The rotor 52 includes a cylindrical yoke 56 that is externally fitted and fixed to the horizontal rotating shaft 15, and a field coil 57 made of a superconducting material that is attached to the outer peripheral surface of the yoke 56 with a circumferential interval. Yes.
The heat insulating container 53 includes a main body portion 58 that surrounds the rotor 52, a cylindrical portion 59 that protrudes from the side surface of the main body portion 58 and has a reduced diameter, and a bearing portion 60 that penetrates the rotating shaft 15 at the tip of the cylindrical portion 59. Yes.
The stator 51 opposes the field coil 57 with a yoke 54 provided so as to surround a part of the main body portion 58 and the cylindrical portion 59 of the heat insulating container 53, and a circumferential interval on the inner peripheral surface of the yoke 54. And an armature coil 55 attached in such a manner.

  A nozzle 27 connected to the liquid nitrogen tank 25 is disposed on the upper side of the heat insulating container 53, and a gas discharge port 58a for discharging vaporized nitrogen is provided. Supply control means 26 for controlling the discharge amount of liquid nitrogen from the nozzle 27 is interposed in the heat insulating supply pipe 30 that connects the nozzle 27 and the liquid nitrogen tank 25. Further, a gas suction means 28 and a liquefaction means 29 are interposed in the heat insulating return pipe 31 that connects the gas discharge port 58 a and the tank 25. Liquid nitrogen R dropped from the nozzle 27 is stored in the lower part of the heat insulating container 53.

  If it is set as the said structure, the liquid nitrogen R will be sprinkled up by the rotor 52, the inside of the heat insulation container 53 will be spread | diffused in the shape of a mist, and the field coil 57 will be cooled to liquid hydrogen temperature. Since other configurations are the same as those of the first embodiment, the same reference numerals are given and description thereof is omitted.

FIG. 7 shows a fifth embodiment.
The difference from the fourth embodiment is that the armature coil 64 of the stator 61 is also a superconducting coil, and the heat insulating container 62 accommodates both the stator 61 and the rotor 52.

In the superconducting motor device 60 of the present embodiment, the heat insulating container 62 is formed so as to cover the outer surface of the stator 61. The stator 61 includes a yoke 63 provided so as to surround the rotor 52, and an armature made of a superconducting material attached so as to face the field coil 57 at an interval in the circumferential direction on the inner peripheral surface of the yoke 63. The yoke 63 includes a large-diameter through hole 63a at a position through which the rotary shaft 15 passes.
The heat insulating container 62 includes a main body portion 65 that surrounds the stator 61, a cylindrical portion 66 that projects from the side surface of the main body portion 65 and has a reduced diameter, and a bearing portion 67 that penetrates the rotating shaft 15 at the tip of the cylindrical portion 66. Yes. The hole diameter on the large diameter side of the cylindrical portion 66 and the hole diameter of the through hole 63a of the stator 61 are substantially the same.

  A nozzle 27 connected to the liquid nitrogen tank 25 is disposed on the heat insulation container 63 and the stator 61, and gas discharge ports 63a and 65a for discharging vaporized nitrogen are provided. Supply control means 26 for controlling the discharge amount of liquid nitrogen from the nozzle 27 is interposed in the heat insulating supply pipe 30 that connects the nozzle 27 and the liquid nitrogen tank 25. Further, a gas suction means 28 and a liquefaction means 29 are interposed in the heat insulating return pipe 31 connecting the gas discharge ports 63a and 65a and the tank 25. Liquid nitrogen R dropped from the nozzle 27 is stored in the lower part of the heat insulating container 62. Since other configurations are the same as those of the fourth embodiment, description thereof is omitted.

8A and 8B show a sixth embodiment.
The difference from the first embodiment is that the rotation shielding plates 70 to 72 are externally fitted and fixed to the rotary shaft 15 located in the cylindrical portion 23 of the heat insulating container 14.
In the cylindrical portion 23 of the heat insulating container 14, the disk-shaped rotary shielding plates 70 to 72 are externally fixed to the rotary shaft 15 with a slight gap from the inner wall of the cylindrical portion 23. Further, the outer diameters of the respective rotation shielding plates 70 to 72 are reduced in the order of 70 → 71 → 72 so as to follow the inclination of the cylindrical portion 23.

  With the above configuration, the space of the cylindrical portion 23 is divided into a plurality of small rooms by the three rotation shielding plates 70 to 72, so that convection of gas in the cylindrical portion 23 is suppressed and the gas stays in the cylindrical portion 23. Therefore, the gas staying in the cylinder portion 23 exhibits a heat insulating action, and heat intrusion along the rotation shaft 15 can be reduced. In addition, gas has a much smaller heat capacity than liquid and can reduce heat loss. Since other configurations are the same as those of the first embodiment, description thereof is omitted. Moreover, this structure is applicable to all the 1st-5th embodiment mentioned above.

9A and 9B show a seventh embodiment.
The difference from the sixth embodiment is that, instead of providing a rotating shielding plate, substantially annular fixed shielding plates 75 to 77 are provided on the inner wall of the cylindrical portion 23.
The fixed shielding plates 75 to 77 are attached to the inner wall so as to close the flow path of the cylindrical portion 23, and through holes 75 a to 77 a for loosely fitting the rotary shaft 15 are provided at the center, and communication holes are provided at the lower end. 75b to 77b are cut out. Further, the outer diameters of the fixed shielding plates 75 to 77 are reduced in the order of 75 → 76 → 77 so as to follow the inclination of the cylindrical portion 23.

  With the above configuration, the space of the cylindrical portion 23 is partitioned by the fixed shielding plates 75 to 77 and gas convection is suppressed. Therefore, heat intrusion along the rotation shaft 25 is reduced by the heat insulating action of the gas filling the cylindrical portion 23. it can. Further, even when a liquid droplet that has entered the cylinder portion 23 adheres to the inner wall and accumulates, it can return to the main body portion 22 through the communication holes 75b to 77b by its own weight. Since other configurations are the same as those of the first embodiment, description thereof is omitted. Moreover, this structure is applicable to all the 1st-5th embodiment mentioned above.

FIG. 10 shows an eighth embodiment.
In the present embodiment, the rotation shielding plates 70 to 72 of the sixth embodiment and the stationary shielding plates 75 to 77 of the seventh embodiment are alternately arranged in the axial direction in the cylindrical portion 23 of the heat insulating container 14.
With the above configuration, a slight gap is provided between the rotation shielding plates 70 to 72 and the inner wall of the cylindrical portion 23, but the gap may be blocked by the adjacent fixed shielding plates 75 to 77. Since it can do, the gas which exists in the cylinder part 23 becomes difficult to move to an axial direction further, and heat insulation improves. Since other configurations are the same as those of the first embodiment, description thereof is omitted. Moreover, this structure is applicable to all the 1st-5th embodiment mentioned above.

FIG. 11 shows a ninth embodiment.
In the present embodiment, known moving blades 82, 84, 85, 87 and stationary blades 83, 86 known for turbines are provided in the cylindrical portion 23 of the heat insulating container 14.
In the first group 80 arranged on the main body part 22 side, one stationary blade 83 is arranged between the two moving blades 82 and 84, and the flow direction is directed to the main body part 22.
In the second group 81 disposed on the bearing portion 24 side, one stationary blade 86 is disposed between the two rotor blades 85 and 87 and the flow direction is directed to the bearing portion 24.

  The rotor blades 82, 84, 85 and 87 are externally fitted and fixed to the rotary shaft 15 with a slight clearance from the inner wall of the cylindrical portion 23. On the other hand, the stationary blades 83 and 86 are attached to the inner wall so as to close the flow path of the cylindrical portion 23 like the fixed shielding plate of the seventh embodiment, and the rotating shaft is loosely fitted at the center of the stationary blades 83 and 86. A through hole is provided, and a communicating hole is cut out at the lower end of the stationary blades 83 and 86.

  With the above-described configuration, the moving blades and stationary blades of a known turbine are used to push the gas to the main body portion 22 by the actions of the moving blades 82 and 84 and the stationary blades 83 of the first group 80, while Since the gas is pushed out to the bearing portion 24 by the action of the blades 85 and 87 and the stationary blade 86, the gas between the first group 80 and the second group 81 is discharged to both sides, and the intermediate portion 88 is in a substantially vacuum state. . Therefore, the heat insulation effect can be dramatically improved. Moreover, this structure is applicable to all the 1st-5th embodiment mentioned above.

It is sectional drawing which shows the superconducting motor apparatus of 1st Embodiment of this invention. It is sectional drawing seen from the axial direction of the heat insulation container and rotor of 1st Embodiment. It is sectional drawing at the time of rotor rotation. It is sectional drawing of 2nd Embodiment. It is sectional drawing which shows the superconducting motor apparatus of reference 3rd Embodiment. It is sectional drawing which shows the superconducting motor apparatus of 4th Embodiment. It is sectional drawing which shows the superconducting motor apparatus of 5th Embodiment. (A) is principal part sectional drawing which shows the superconducting motor apparatus of 6th Embodiment, (B) is a principal part expansion perspective view. (A) is principal part sectional drawing which shows the superconducting motor apparatus of 7th Embodiment, (B) is a principal part expansion perspective view. It is principal part sectional drawing which shows the superconducting motor apparatus of 8th Embodiment. It is principal part sectional drawing which shows the superconducting motor apparatus of 9th Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Superconducting motor apparatus 11 and 12 Stator 13 Rotor 14 Thermal insulation container 15 Rotary shaft 16 and 19 Armature coil 20b Protrusion 21 Field coil (superconducting coil)
22 Main body portion 22a Gas discharge port 23 Tube portion 24 Bearing portion 25 Liquid nitrogen tank 26 Supply control means 27 Nozzle 27 'Spray nozzle 28 Gas suction means 29 Liquefaction means R Liquid nitrogen (liquid refrigerant)

Claims (10)

A superconducting coil formed of a superconducting material is attached to the rotor that connects the rotating shaft, the rotor and the rotating shaft are disposed in a heat insulating container, and the heat insulating container surrounds the rotor, and the side surface of the main body portion. A cylindrical portion that protrudes in a horizontal direction; and a bearing portion that rotatably penetrates the rotating shaft at a distal end side of the cylindrical portion, and at least a bottom surface side of the cylindrical portion is a taper that is inclined downward toward the main body portion. Surface, and
A liquid refrigerant is stored in a lower part of the heat insulating container, a part of the rotor is immersed in the liquid refrigerant, and the liquid refrigerant is scattered in the heat insulating container by the rotation of the rotor. Superconducting motor device.   The superconducting motor device according to claim 1, wherein a protrusion or / and groove for promoting scattering of the liquid refrigerant is formed in a part of the rotor. A nozzle connected to a tank for storing the liquid refrigerant is installed at the top of the heat insulating container, and a gas discharge port is provided in the heat insulating container.
3. The superconducting motor device according to claim 1, wherein the liquid refrigerant is supplied from the nozzle into the heat insulating container, and the refrigerant which has been heated and vaporized is discharged from the gas discharge port.   The superconducting motor device according to claim 3, wherein the nozzle is a spray nozzle, and the coolant is replenished to the heat insulating container while directly cooling the rotor by spraying the liquid refrigerant from the spray nozzle. The superconductivity according to any one of claims 1 to 4 , wherein a rotation shielding plate is externally fitted and fixed to the rotation shaft located in the cylinder portion with a gap from the inner wall of the cylinder portion. Motor device. A fixed shielding plate for closing the flow path of the cylindrical portion is attached to the cylindrical portion, and a through hole for loosely fitting the rotating shaft is provided at the center of the fixed shielding plate, and at the lower end of the fixed shielding plate The superconducting motor device according to claim 1, wherein the communication hole is cut out . The superconducting motor apparatus according to rotation shielding plate and said fixed shield plate請 Motomeko 6 are arranged alternately in the axial direction. A rotating blade is fitted and fixed to the rotating shaft located in the cylindrical portion with a gap from the inner wall of the cylindrical portion, and a stationary blade that closes the flow path of the cylindrical portion is provided in the cylindrical portion. Attached to the inner wall,
A through hole for loosely fitting the rotating shaft is provided at the center of the stationary blade, and a communication hole is cut out at the lower end of the stationary blade, so that the moving blade and the stationary blade are alternately arranged in the axial direction. Placed in
The moving blades and the stationary blades are grouped and attached to a first group disposed on the main body portion side and a second group disposed on the bearing portion side,
The first group arranges the moving blades and the stationary blades so that the flow direction faces the main body portion, while the second group arranges the moving blades and the stationary blades such that the flow direction faces the bearing portion side. The superconducting motor device according to any one of claims 1 to 4, wherein: The stator is arranged opposite to the required gap in the axial direction of the rotor,
The rotation shaft fixed to the rotor passes through the stator rotatably,
An axial gap structure in which a magnetic flux direction of a coil attached to the rotor and the stator is arranged in an axial direction; and
9. The stator according to claim 1, wherein an armature coil made of a normal conducting material is attached to the stator, and the rotor and the stator are arranged opposite to each other with a heat insulating container surrounding only the rotor and the rotating shaft. 2. A superconducting motor device according to item 1 . Providing a stator that surrounds the outer periphery of the rotor with a required gap;
A radial gap structure in which a magnetic flux direction of a coil attached to the rotor and the stator is arranged in a radial direction; and
9. The stator according to claim 1, wherein an armature coil made of a normal conducting material is attached to the stator, and the stator is disposed on the outer periphery of the rotor with a heat insulating container surrounding only the rotor and the rotating shaft. 2. A superconducting motor device according to item 1 .

Images