阅读说明：本技术 超导感应旋转电机以及使用该超导感应旋转电机的超导驱动力产生系统 (Superconducting induction rotating machine and superconducting drive force generation system using same ) 是由 岩熊成卓 和泉辉郎 于 2020-04-24 设计创作，主要内容包括：本发明提供一种更加小型且能够省电地运转,并且作为推进力产生系统,具有广泛的应用范围的超导感应旋转电机。根据本发明,提供一种超导感应旋转电机1,其具有：定子14和转子18,上述定子14通过多个超导体电枢线圈15沿周向配置而形成,上述转子18设置为在与上述定子14隔开指定间隔地相对的状态下,能够绕中心轴线旋转,上述转子18由圆筒状的导电材料层22与磁体层23形成的复合体构成,上述导电材料层22配置于与上述定子14相对的一侧,上述磁体层23配置于与该导电材料层22的与上述定子14相对的一侧的相反侧的面,在将设置于上述定子14的超导体电枢线圈15冷却为超导状态的状态下,通过该电枢线圈25产生的旋转磁场,来使上述转子18产生旋转转矩并驱动上述转子18旋转。(The invention provides a superconducting induction rotating machine which is smaller, can be operated in a power-saving mode, and has a wide application range as a propulsion force generation system. According to the present invention, there is provided a superconducting induction rotating electrical machine 1 having: a stator 14 and a rotor 18, the stator 14 being formed by arranging a plurality of superconductor armature coils 15 in a circumferential direction, the rotor 18 being provided so as to be rotatable around a central axis in a state of facing the stator 14 with a predetermined gap, the rotor 18 being formed of a composite body of a cylindrical conductive material layer 22 and a magnet layer 23, the conductive material layer 22 being disposed on a side facing the stator 14, the magnet layer 23 being disposed on a surface opposite to the side facing the stator 14 of the conductive material layer 22, and the rotor 18 being driven to rotate by generating a rotational torque by a rotational magnetic field generated by the armature coils 25 in a state of cooling the superconductor armature coils 15 provided on the stator 14 to a superconducting state.)

1. A superconducting induction rotating machine, comprising:

a stator formed by arranging a plurality of superconductor armature coils in a circumferential direction; and

a rotor provided to be rotatable around a central axis in a state of being opposed to the stator with a prescribed interval therebetween,

the rotor is composed of a cylindrical conductive material layer disposed on a side facing the stator, and a composite body formed of a magnet layer disposed on a surface opposite to the side facing the stator of the conductive material layer,

in a state where a superconducting armature coil provided in the stator is cooled to a superconducting state, the rotor is driven to rotate by generating a rotational torque by a rotating magnetic field generated by the armature coil.

2. The superconducting induction rotating machine according to claim 1,

in the superconducting induction rotating machine, a thrust generator that generates thrust is fixed to an inner circumferential surface or an outer circumferential surface of the rotor, and the thrust generator is driven by rotational driving of the rotor to generate thrust.

3. The superconducting induction rotating machine according to claim 2,

in the superconducting induction rotating machine, the thrust generator is a propeller blade fixed to an inner circumferential surface or an outer circumferential surface of the rotor on a side opposite to the stator.

4. The superconducting induction rotating machine according to claim 2,

in the superconducting induction rotating machine, the thrust generator is a propeller blade fixed to an inner circumferential surface or an outer circumferential surface of the rotor on a side opposite to the stator.

5. The superconducting induction rotating machine according to claim 2,

in the superconducting induction rotating machine, the thrust generator is a tread body that is fixed to an inner circumferential surface or an outer circumferential surface of the rotor on a side opposite to the stator and transmits a driving force from the rotating machine by friction with an object.

6. The superconducting induction rotating machine according to claim 1,

in the superconducting induction rotating electrical machine, the stator has a stator body that holds a plurality of superconductor armature coils,

the stator body is formed of a material that maintains mechanical strength at low temperatures and is electrically non-conductive.

7. The superconducting induction rotating machine according to claim 1,

in the superconducting induction rotating electrical machine, the rotor is an outer rotor of the rotating electrical machine,

the conductive material layer is arranged on the inner diameter side of the stator, and the magnet layer is arranged on the outer diameter side.

8. The superconducting induction rotating machine according to claim 1,

in the superconducting induction rotating electrical machine, the rotor is an inner rotor of the rotating electrical machine,

the conductive material layer is arranged on the outer diameter side of the stator, and the magnet layer is arranged on the inner diameter side.

9. The superconducting induction rotating machine according to claim 1,

in the superconducting induction rotating electrical machine, a heat radiation fin is provided at the rotor.

10. The superconducting induction rotating machine according to claim 1,

in the superconducting induction rotating machine, the rotor is formed by embedding a tape-shaped superconducting wire material in a conductor layer and fixing short-circuiting rings at both ends thereof along a central axis.

11. The superconducting induction rotating machine according to claim 10,

in the superconducting induction rotating machine, both end portions of the superconducting wire rod are bent.

12. The superconducting induction rotating machine according to claim 10,

in the superconducting induction rotating machine, a groove for embedding the superconducting wire is formed in the conductor layer.

13. The superconducting induction rotating machine according to claim 1,

in the superconducting induction rotating machine, the rotor is formed by arranging superconducting wires on the surface of the conductor layer at a predetermined interval in the circumferential direction and in a direction intersecting the circumferential direction.

14. The superconducting induction rotating machine according to claim 1,

in the superconducting induction rotating machine, a liquid feeding propeller blade is fixed to an inner diameter portion of the rotor, and a fluid flowing through the inner diameter portion is pump-driven along an axis of the rotor.

15. A fluid drive system, characterized in that,

the superconducting induction rotating machine according to claim 14, wherein a stator and a rotor are provided so that the stator is attached to a middle portion of a circular tubular fluid flow pipe so that central axes thereof are aligned, and the rotor is disposed so as to be exposed to the fluid flow pipe, thereby driving a pump of a fluid flowing through the fluid flow pipe.

16. The fluid drive system as defined in claim 15,

in the fluid driving system, the fluid driven by the pump is a refrigerant,

the superconductor armature coil is cooled by the refrigerant.

17. The fluid drive system as defined in claim 16,

in the fluid drive system, the superconducting induction rotating electrical machines are disposed at prescribed intervals along the liquid flow pipe.

18. A superconducting driving force generating system, comprising:

the superconducting induction rotating machine of claim 1, a superconducting generator for supplying power to the rotating machine, and a superconducting cable connecting the generator and the rotating machine.

19. The superconducting driving force generating system according to claim 18,

the superconducting drive force generation system includes a refrigeration system common to the superconducting induction rotating machine, the superconducting generator, and the superconducting cable for cooling.

20. The superconducting driving force generating system according to claim 18,

in the superconducting motive power generation system, further having a gas turbine engine for driving the superconducting generator,

the gas turbine engine is a gas that processes LNG or liquid hydrogen having a refrigerant function by a refrigeration system.

21. An aircraft, characterized in that:

the aircraft using the superconducting driving force generating system according to claim 12,

and the superconducting induction rotating electrical machines are arranged in parallel on the upper surface of the main wing.

Technical Field

The present invention relates to an induction rotating machine using superconduction and a superconducting drive force generation system using the same.

Background

In recent years, with the advent and development of high-temperature oxide superconductors (yttrium (Y) and bismuth (Bi) superconductors that transition to a superconducting state at around a liquid nitrogen temperature (77K), various studies and developments have been advanced in the field of motors with the aim of downsizing, weight reduction, and high efficiency.

As for the application of a superconductor to a motor, there are a structure in which a rotor is made superconducting and a stator is made normally conductive, a structure in which a rotor and a stator are made superconducting, and the like, but in an ac motor, since it is necessary to flow an ac current through an armature coil, there is a problem in that an ac loss occurs in a superconductor used for the armature coil, and a problem in that the coil shape becomes complicated, and therefore, at present, the development of a motor in which a superconductor is applied to a rotor is mainstream, and as an example of the already published research and development, the following prior art documents are known.

Patent document

Patent document 1: japanese Kohyo publication Hei 8-505515

Patent document 2: japanese re-publication of Japanese patent No. 2009/116219

Patent document 3: japanese patent laid-open publication No. 2013-240147

Disclosure of Invention

In the motor disclosed in patent document 1, the rotor is formed of a laminated body of a high-temperature superconductor and a torque shield (torque shield) made of a normally conductive material, and when the motor is started at normal temperature, an alternating magnetic field (rotating magnetic field) is generated by energization of an armature coil (primary winding) disposed in a stator, an induction current is induced in the torque shield of the rotor by the action of the alternating magnetic field, the rotating electric machine is started in an induction mode by an induction torque generated by the interaction between the induction current and the alternating magnetic field, and after the rotor reaches a predetermined rotation speed from the start of the motor, the superconductor is cooled to a superconducting state of a critical temperature or lower, and the alternating magnetic field is captured by a superconductor magnetic flux and synchronously rotated.

According to the superconducting rotating electrical machine, the superconducting rotating electrical machine can be operated without supplying electric power to the rotor from the outside, and accordingly, the structure can be simplified.

However, in order to switch from the induction mode to the synchronous operation at the time of starting the rotating electric machine, it is necessary to determine the critical temperature of the superconductor and cool the superconductor to the critical temperature or less, and the process of increasing and decreasing the temperature takes a long time, and thus there is a problem that the operation responsiveness of the motor is lowered. Therefore, in a rotating electrical machine applied to a use such as an electric vehicle in which a start and a stop are often repeated, it is considered that it is difficult to keep the superconductor at a critical temperature or less because a large joule heat (copper loss) is generated by a torque shield, and furthermore, an increase in copper loss itself is a main cause of a decrease in the efficiency of the rotating electrical machine.

On the other hand, patent document 2 proposes a motor that improves the problem of patent document 1. The superconducting rotating electrical machine has a structure in which a rotor core of a cage-type induction rotating electrical machine is provided with a combination of a normal cage winding formed by connecting an end ring to a rotor bar (rotor bar) made of a normal wire and both ends thereof and a superconducting cage winding formed by connecting an end ring to a rotor bar made of a superconducting wire and accommodated in a groove formed in the circumferential surface of the rotor core.

According to the motor, in the normal conduction state, the motor can be started and operated by the dominance of the induction torque generated by the interaction between the induction current flowing through the normal conduction cage winding and the rotating magnetic field generated by the energization of the armature coil disposed on the stator side, and in the superconducting state, the superconducting cage winding captures the magnetic flux of the rotating magnetic field applied by the armature coil of the stator and operates in synchronization therewith, and the operation independent of the superconducting critical temperature can be performed.

However, the motor of patent document 2 has the following problems in practice. That is, in the motor of patent document 2, since the cage rotor is formed by providing the normal conducting cage winding and the superconducting cage winding at the same time on the rotor core, when the rotating electrical machine is started at a normal temperature equal to or higher than the critical temperature of the superconducting cage winding, as in the torque shield in the superconducting rotating electrical machine of patent document 1, an induced current flows through the normal conducting cage winding, and a large joule heat and copper loss are generated. In addition, in the case of the superconducting cage winding, both ends of the rotor bar are also required to be electrically connected to the endring, and thus the winding structure is complicated. In addition, although a connection method by soldering is generally used for electrical connection between the rotor bar and the end ring, a problem often arises in the joint strength, and it is difficult to ensure high reliability against centrifugal load and long-term use. Further, since the normally conductive and superconducting cage winding is housed in the slot of the heavy rotor core, it is difficult to reduce the weight and size of the superconducting rotating electrical machine.

Patent document 3 discloses a novel superconducting rotating electrical machine which does not require power supply from the outside to a superconductor assembled in a rotor, and in which a torque shield in patent document 1, a normally conductive metal body accompanied by joule heat such as a normally conductive cage winding in patent document 2, and a rotor core as a weight are not provided in combination in the rotor, and which skillfully utilizes the superconducting characteristics of the superconductor and can exhibit a high-efficiency rotating function in addition to reduction in size and weight. That is, the superconducting rotating electrical machine in patent document 3 includes an armature coil provided on a stator side and a superconducting rotor having a plate-shaped superconductor, and a shield current is induced in the superconductor by causing a magnetic field from the armature coil to act on the plate-shaped superconductor, and a rotational force is generated in the superconducting rotor based on an electromagnetic force generated by an interaction between the shield current and the magnetic field. However, although the superconducting rotor having a plate-like superconductor contributes to the miniaturization and weight reduction of the rotor, it is difficult to improve the torque for generating a rotational force in the superconducting rotor.

The present invention has been made in view of the above problems, and an object thereof is to provide a superconducting induction rotating electrical machine which is further compact and can be operated with power saving, and which can generate a driving force very efficiently.

Further, it is a further object of the present invention to provide a superconducting induction rotating machine which is simple in structure and has a wide range of applications as a propulsion force generation system.

That is, according to a first main aspect of the present invention, the following invention is provided.

(1) A superconducting induction rotating machine, comprising:

a stator formed by arranging a plurality of superconductor armature coils in a circumferential direction; and

a rotor provided to be rotatable around a central axis in a state of facing the stator with a predetermined interval therebetween,

the rotor is composed of a cylindrical conductive material layer disposed on a side facing the stator, and a composite body formed of a magnet layer disposed on a surface opposite to the side facing the stator of the conductive material layer,

in a state where a superconducting armature coil provided in the stator is cooled to a superconducting state, the rotor is rotated by generating a rotational torque by a rotating magnetic field generated by the armature coil.

(2) The superconducting induction rotating electrical machine according to (1) above, wherein a thrust generator that generates thrust is fixed to an inner peripheral surface or an outer peripheral surface of the rotor, and the thrust generator is driven by rotational driving of the rotor to generate thrust.

(3) The superconducting induction rotating electrical machine according to (2) above, characterized in that,

in the superconducting induction rotating electrical machine, the thrust generator is a propeller blade fixed to an inner peripheral surface or an outer peripheral surface of the rotor on a side opposite to a side facing the stator.

(4) The superconducting induction rotating electrical machine according to (2) above, characterized in that,

in the superconducting induction rotating electrical machine, the thrust generator is a propeller blade fixed to an inner peripheral surface or an outer peripheral surface of the rotor on a side opposite to a side facing the stator.

(5) The superconducting induction rotating electrical machine according to (2) above, characterized in that,

in the superconducting induction rotating machine, the thrust generator is a tread (tread) fixed to an inner circumferential surface or an outer circumferential surface of the rotor on a side opposite to the stator, and transmits the driving force from the rotating machine by friction with the object.

(6) The superconducting induction rotating electrical machine according to the above (1),

in the superconducting induction rotating electrical machine, the stator has a stator main body that holds a plurality of superconductor armature coils,

the stator body is formed of a material that maintains mechanical strength at low temperatures and is electrically non-conductive.

(7) The superconducting induction rotating electrical machine according to the above (1),

in the superconducting induction rotating electrical machine, the rotor is an outer rotor of the rotating electrical machine,

the conductive material layer is disposed on an inner diameter side of the stator, and the magnet layer is disposed on an outer diameter side.

(8) The superconducting induction rotating electrical machine according to the above (1),

in the superconducting induction rotating electrical machine, the rotor is an inner rotor of the rotating electrical machine,

the conductive material layer is disposed on the outer diameter side of the stator, and the magnet layer is disposed on the inner diameter side.

(9) The superconducting induction rotating electrical machine according to the above (1),

in the superconducting induction rotating electrical machine, the rotor is provided with heat dissipating fins (fin).

(10) The superconducting induction rotating electrical machine according to the above (1),

in the superconducting induction rotating machine, the rotor is formed by embedding a strip-shaped superconducting wire material in a conductor layer and fixing short-circuiting rings at both ends of the conductor layer along a central axis.

(11) The superconducting induction rotating machine according to the above (10),

in the superconducting induction rotating machine, both end portions of the superconducting wire rod are bent.

(12) The superconducting induction rotating machine according to the above (10),

in the superconducting induction rotating electrical machine, the conductor layer has a groove formed therein for embedding the superconducting wire.

(13) The superconducting induction rotating electrical machine according to the above (1),

in the superconducting induction rotating electrical machine, the rotor is formed by disposing the superconducting wire on the surface of the conductor layer at a predetermined interval in the circumferential direction and in a direction intersecting the circumferential direction.

(14) The superconducting induction rotating electrical machine according to the above (1),

in the superconducting induction rotating machine, a liquid feeding propeller blade is fixed to an inner diameter portion of the rotor, and a fluid flowing through the inner diameter portion is pump-driven along an axis of the rotor.

(15) A fluid drive system, characterized by:

the superconducting induction rotating electrical machine according to (14) above, wherein the stator and the rotor are each provided such that the stator is attached to a middle portion of a circular tubular fluid flow pipe so that the central axes thereof coincide with each other, and the rotor is disposed so as to be exposed to the fluid flow pipe, thereby driving a pump of a fluid flowing through the fluid flow pipe.

(16) The fluid drive system according to the above (15),

in the fluid drive system, the fluid driven by the pump is a refrigerant,

the superconductor armature coil is cooled by the refrigerant.

(17) The fluid drive system according to the above (16),

in the fluid drive system, the superconducting induction rotating machine is provided at predetermined intervals along the liquid flow pipe.

(18) A superconducting driving force generating system, comprising:

the superconducting induction rotating electrical machine described in (1) above, a superconducting generator for supplying power to the rotating electrical machine, and a superconducting cable connecting the generator and the rotating electrical machine.

(19) The superconducting driving force generating system according to the above (18),

the superconducting driving force generation system includes a refrigeration system common to the superconducting induction rotating machine, the superconducting generator, and the superconducting cable for cooling.

(20) The superconducting driving force generating system according to the above (18),

in the superconducting driving force generating system, further comprising a gas turbine engine for driving the superconducting generator,

the Gas turbine engine is a Gas that is processed by a refrigeration system for LNG (Liquefied Natural Gas) or liquid hydrogen having a refrigerant function.

(21) An aircraft, characterized in that:

the aircraft using the superconducting driving force generation system according to (12) above,

and the superconducting induction rotating electrical machines are arranged in parallel on the upper surface of the main wing.

According to the configuration of the present invention, the rotor can be formed into a thin and lightweight tubular body, and a superconducting induction rotating machine with high efficiency and high output power can be obtained.

Further, according to the configuration of the present invention, the rotor can be configured by a simple cylindrical body without including a winding or the like, so that the entire structure can be reduced in size and weight, and the rotating electric machine having excellent durability and reliability can be obtained at low cost.

Further, a propulsion force generator such as a fin, a propeller, or a tire can be directly attached to the inner surface or the outer surface of the cylindrical rotor, and a propulsion force generation system having a simple structure and a small loss in transmission of driving force can be obtained.

The features of the present invention other than those described above will be apparent to those skilled in the art from the following description of the embodiments of the present invention.

Drawings

Fig. 1 is a schematic diagram of a superconducting driving force generation system according to an embodiment of the present invention.

Similarly, fig. 2 is a schematic configuration diagram showing an outer rotor type superconducting induction motor.

Similarly, fig. 3 is a schematic configuration diagram showing an inner rotor type superconducting induction motor.

Similarly, fig. 4 is a plan view showing the stator.

Similarly, fig. 5 is a perspective view showing the stator.

Similarly, fig. 6 is a plan view and a front view showing a superconductor armature coil.

Similarly, FIG. 7A, B is a side view and a front view showing a portion of superconducting winding material.

Similarly, fig. 8 is a perspective view showing the rotor.

Similarly, fig. 9 is a perspective view showing the rotor.

Similarly, fig. 10 is a perspective view showing a state in which the stator and the rotor are combined.

Fig. 11A, B is a plan view and a perspective view showing a stator according to another embodiment.

Fig. 12 is a perspective view of a rotor according to still another embodiment.

Similarly, fig. 13 is a perspective view showing the assembly of the rotor.

Similarly, fig. 14 is a perspective view showing the assembly of the rotor.

Fig. 15 is a schematic view showing a rotor according to another embodiment.

Fig. 16A, B is a schematic diagram showing a liquid feeding system according to another embodiment.

Fig. 17 is a schematic view showing a tire system according to still another embodiment.

Detailed Description

The preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

(full superconducting propulsive force generating system)

Fig. 1 is a schematic diagram showing a concept of a configuration of a total superconducting system 2 including a superconducting induction motor 1 according to the present embodiment.

The system 2 has substantially a high-efficiency gas turbine engine 3, a superconducting generator 4, a superconducting inverter/superconducting cable 5, and the above-described superconducting induction motor 1. In this system 2, LNG or liquid hydrogen having a refrigerant function is used as fuel for the gas turbine engine 3, and liquid nitrogen is used as a refrigerant for cooling the superconductor. Further, by treating the fuel and the refrigerant using the common refrigerator 6, the overall power consumption can be suppressed.

In the all-superconducting system 2, the generator 4, the superconducting inverter/cable 5, and the superconducting induction motor 1 are connected without passing through room temperature, so that the flow paths for cooling the refrigerant having the above-described configuration are shared and integrated. This can further reduce the load on the refrigerant, and reduce power consumption.

The fully superconducting system 2 is mounted on, for example, an aircraft (indicated by a in the figure).

Conventionally, 1 to 2 jet engines of an aircraft are mounted on one wing, but when this full superconducting propulsion system is used, for example, 4 superconducting induction motors are disposed in a dispersed manner at predetermined intervals in the wingspan direction in the upper part of the aircraft as shown in fig. 1.

The output power of the current jet engine is 5kW/kg, but in the fully superconducting system, the output power of 20kW/kg can be theoretically reached. Therefore, if this system is mounted on an aircraft, it can take off at an output power of half or less of that of the conventional aircraft.

When the present invention is applied to an aircraft, the number of motors and the output power of each motor may be appropriately selected. In addition, when the steering device is applied to an aircraft, each electric motor may be individually controlled to perform steering in the vertical and horizontal directions.

(outer rotor type superconducting induction motor)

Fig. 2 is a conceptual diagram of an authentication system 10 of an outer rotor type motor 1' as a superconducting induction motor 1 used in the above-described all-superconducting system 2. The verification system 10 is configured to verify whether or not a sufficient output power can be obtained from the superconducting induction motor 1', and is configured to be able to float by being driven upward (indicated by arrow B) by a rotor-mounted propeller blade 11 described later when a sufficient output power is obtained.

Next, the configuration of the verification system 10 of the outer rotor type superconducting induction motor 1' will be described.

In fig. 2, shown at 12 is a base. The base 12 is formed in a disc shape, and a pair of rod-like linear guides 13 are provided upright in parallel at a fixed distance on the upper surface of the center portion thereof. The linear guide 13 plays a role of guiding the induction motor 1 'in a vertical direction when the outer rotor type induction motor 1' is driven upward (arrow B) by the propulsive force of the propeller blades 11.

The stator 14 is slidably held in the linear guide 13 in the vertical direction. The stator 14 is formed of a cylindrical member having closed upper and lower openings, and a superconducting armature coil 15 is disposed on an inner surface of an outer peripheral wall portion thereof. The stator 14 is configured as a vacuum vessel having a predetermined degree of vacuum (for example, about 10-5 to 10-6 Torr) in order to maintain the cooling temperature of the superconductor armature coil 15. A power supply lead 17 for supplying electric power from the generator 4 (fig. 1) is connected to the superconducting armature coil 15 and led out from a lower portion of the stator 14 to the outside.

The rotor 18 having a cylindrical body is fitted over the stator 14 with a gap of a predetermined size from the stator 14. Bearings 19 and 20 shown in the drawings are interposed between the stator 14 and the rotor 18 at the upper end and the lower end.

The rotor 18 is a thin composite body composed of a high-conductivity layer 22 and a magnet layer 23, and is very light, the high-conductivity layer 22 is composed of a high-conductivity nonmagnetic body such as copper or aluminum disposed on a surface facing the stator 14, and the magnet layer 23 is composed of high-permeability iron or the like disposed immediately outside the high-conductivity layer 22 for returning magnetic flux. That is, the magnetic flux crossing the high-conductivity layer 22 is increased by the magnetic layer 23, and thus the current induced in the high-conductivity layer is increased, which tends to increase the torque.

However, if the thickness of the magnet layer 23 is increased, the weight will also increase, and therefore, attention is required.

The propeller blades 11 are provided on the outer peripheral surface of the rotor 18. In a state in which the respective propeller blades 11 are fixed at their base portions 11a to the outer peripheral surface of the rotor 18 by, for example, welding and their distal end portions 11b extend outward in the diametrical direction of the rotor 18, the respective propeller blades 11 are arranged at fixed intervals along the outer periphery of the rotor 18.

In the above configuration, if power is supplied to the superconducting armature coil 15 provided in the stator 14, a rotating magnetic field generated by the armature coil 15 generates a rotating torque to the rotor 18, and the rotor 18 can be driven to rotate. Then, the propeller blades 11 are rotated in the direction indicated by the arrow C, and the induction motor 1' can be floated.

Although the above-described configuration may have a problem of temperature rise of the rotor 18, the propeller blades 11 in the above-described configuration also have a function of a heat sink, and this problem can be solved.

The inventors confirmed that effective output efficiency can be obtained by such an empirical test, and completed the present invention by continuing further experiments.

(inner rotor type superconducting induction motor)

Fig. 3 is a schematic diagram showing the inner rotor type superconducting induction motor 1 ″.

The induction motor 1 ″ has a stator frame 26, a stator 28, a power supply line 29, a rotor 30, a center shaft 31, and a propeller blade 32, the stator 28 being fixed in the stator frame 26 and holding a superconducting armature coil 27, the power supply line 29 being connected to an upper portion of the armature coil 27 and supplying power to the coil 27, the rotor 30 being held between opposing surfaces of the coil 27 so as to be rotatable about a vertical axis, the center shaft 31 extending upward from the rotor 30 toward the stator 28 and being held rotatably at a central portion of an upper wall of the stator frame 26, and the propeller blade 32 being provided at an upper end portion of the shaft 31.

The stator frame 26 is formed of any material, and preferably, is formed of a material having a heat insulating function. The stator frame 16 has a cylindrical (or rectangular) outer peripheral wall 26a, and an upper wall 26b and a lower wall 26c that close an upper opening and a lower opening of the outer peripheral wall 26 a. A container 33 for holding liquid nitrogen is fixed in the stator frame 26. The stator frame 26 is formed to be a vacuum space having a predetermined degree of vacuum (for example, about 10-5 to 10-6 Torr) in order to maintain the cooling temperature of the superconductor filled in the container 33.

Here, the container 33 is formed of a material that is an insulator that does not generate eddy current loss and has low-temperature mechanical strength, for example, FRP (fiber reinforced polymer). However, the material is not limited to FRP, and may be other materials as long as they have the same performance.

Fig. 4 is a plan view of the stator 28 fixed to the container 33 in the stator frame 26, and fig. 5 is a perspective view of the stator 28.

The stator 28 has a cylindrical main body 35 and a superconductor armature coil 36 attached to the main body 35.

The body 35 is formed of FRP, and as shown in fig. 4, has a hexagonal outer shape in cross section and a circular through hole in the center. Thus, as shown in fig. 5, the main body 35 is configured such that the inner peripheral surface is formed in a tubular shape having a fixed diameter, and the outer peripheral surface has a rectangular shape divided into six surfaces in the circumferential direction.

A total of 6 superconducting armature coils 36 are fixed to each surface along the outer periphery of the main body 35.

Fig. 6 shows a plan view (fig. 6A) and a plan view (fig. 6B) of the superconductor armature coil 36. The superconductor armature coil 36 of this embodiment is formed in the following structure: by forming only the FRP core 37 and the superconducting winding material 38 wound around the core 37 without using a core made of a high permeability material such as iron, the magnetic field flux density can be increased. As shown in fig. 7 (fig. 7A and 7B), the superconducting winding material 38 is a thin, narrow-width tape-shaped RE (yttrium) high-temperature superconducting wire. However, the superconducting wire is not limited to the above shape and material, and may be another superconducting material, for example, a bismuth-based superconducting material.

As shown in fig. 3, the stator 28 to which the superconducting armature coil 36 is attached is fixed to the center of the container 33. The container 33 is filled with a refrigerant, and the superconducting armature coil 36 is cooled by a refrigerant immersion cooling method.

The armature coils 36 may be connected in series or in parallel.

As shown in fig. 8, the rotor 30 disposed in the inner diameter portion of the stator 28 is a cylindrical member having an outer diameter smaller than the inner diameter of the stator 28 (main body 35). As in the example of fig. 1, the rotor 30 is formed to be very light and is composed of a composite body of a conductive material layer 39 and a high-permeability magnet layer 40, the conductive material layer 39 is made of aluminum, copper, or the like disposed on a surface facing the stator 28, and the magnet layer 40 is laminated on an inner surface of the conductive layer 39 and used for returning magnetic flux.

As shown in fig. 9, covers 42 and 43 are attached to the upper and lower sides of the rotor 30, and the center shaft 31 vertically penetrating the rotor 30 along the center axis thereof is attached to the covers.

Fig. 10 is a schematic view showing a state in which the rotor 30 is inserted into the stator 28 and an inner rotor type induction motor unit is assembled.

(other embodiments of the stator)

The stator 28 of the inner rotor type induction motor 1 ″ is an example in which 6 armature coils 36 are attached to the outer surface of the main body 35, but is not limited to this configuration.

In the example shown in fig. 11A and 11B of fig. 11, the main body 35 ' is enlarged, and 12 armature coils 36 ' are fixed to the inner surface side of the main body 35 '. With this configuration, a larger output power can be obtained.

(other embodiments of the rotor)

The above embodiment is an example in which the stator 28 side is superconducting, the rotor 30 is not superconducting, and the rotor 30 is constituted by a lightweight cylindrical body, but if a rotor as shown by reference numeral 30' in fig. 12 and thereafter is used, the rotor 30 can be superconducting while the operational effect of the present invention is exhibited, and high efficiency and high output of the induction motor can be achieved.

The rotor 30' is formed by: the superconducting wires 45 are embedded in the outer conductor layer 39' (layer made of copper) in the vertical direction, and short-circuiting rings 46 and 47 are attached to the upper and lower sides to connect the superconducting wires 45 to each other. The superconducting wire 45 is embedded in the rotor 30 'to increase the density of the shield current induced by the magnetic flux linked with the rotor 30' (increase the shield current), and a large induced current can be generated in the rotor 30 'even if the thickness of the rotor 30' is small. This increases the torque and increases the output power density of the superconducting induction motor.

In this embodiment, the superconducting wire 45 is embedded in a groove 39a provided in the copper conductor layer 39', and the groove is bent in one direction at the upper and lower portions. This enables a shield current to flow in a loop shape, and prevents the superconducting wire from deteriorating in characteristics (lowering in critical current value).

Fig. 12 and 13 are views illustrating a structure and a process for assembling the conductive layer 39' having the groove 39 a.

In this embodiment, the rotor (conductor layer 39') is formed by molding and assembling annular members 50 and 51 having the upper and lower curved grooves 39b and 39c and a member 52 constituting the intermediate portion. The grooves 39a to 39c are formed to have a slight angle in the depth direction with respect to the diameter direction, and are biased. The structure can restrain harmonic torque, electromagnetic exciting force and the like.

As shown in fig. 13, the rotor 30' is completed by fitting a strip-shaped superconducting wire 45 having upper and lower ends bent in accordance with the shapes of the grooves 39a to 39c into the grooves 39a to 39c, and finally attaching the short rings 46 and 47 to the upper and lower ends.

The short-circuiting rings 46 and 47 are configured in a ring shape having the same width as the thickness of the main body by winding a strip-shaped superconducting wire 53 around the outer periphery of a copper ring member 52 in the horizontal direction, and the copper ring member 52 has the same thickness as the wire 45.

The superconducting wire may be attached to the surface of the rotor without being embedded in the rotor. In this case, as indicated by reference numeral 54 in fig. 15, the superconducting wire is preferably formed in a mesh shape by intersecting superconducting wires arranged across the outer circumferential direction with superconducting wires arranged in a direction parallel to the central axis at a predetermined interval, and covering the entire surface of the conductor layer of the rotor.

(other application example of superconducting induction rotating machine)

Fig. 16 shows an example in which the superconducting induction rotating machine of the present invention is applied to a liquid feeding pump for liquid nitrogen or liquid hydrogen.

That is, as shown in fig. 16A, B of fig. 16, the liquid sending pump 55 of this embodiment is disposed in the middle of the liquid sending pipe 56.

In this example, a stator 57 of an induction rotating machine as the liquid sending pump 55 is fixed to the liquid sending pipe 56, and a cylindrical rotor 58 is disposed in the liquid sending pipe and held in a state of facing the superconductor armature coil 59 by the stator 57 via a bearing not shown in the figure.

The rotor 58 is formed of a composite body similar to that of the above-described embodiment, but is formed so that the liquid flowing through the liquid sending pipe passes through the inner diameter portion thereof. A propeller fin 60 is fixed to an inner diameter portion of the rotor 58.

In this example, the liquid nitrogen flowing through the liquid sending pipe 56 is used to cool the superconducting armature coil 59. This can simplify the structure of the stator of the induction motor.

When the liquid sending pipe 56 is long, a plurality of liquid sending pumps 55 are arranged at a predetermined interval. In this case, since the refrigerant flowing through the liquid feeding pipe is used for cooling the superconducting armature coil 59, it is not necessary to provide a separate cooling device.

Therefore, the liquid-sending pump can be effectively used for the refrigerant-supplying system of the all-superconducting system shown in fig. 1.

Fig. 17 shows an example in which the superconducting induction motor of the present invention is incorporated in a small-sized automobile.

In this case, the outer rotor type superconducting induction motor 1' shown in fig. 2 is used, and a tire (tread body) 61 shown in fig. 17 is directly attached to the outer peripheral surface of the rotor 18. Therefore, the tire 61 for automatic running can be configured.

Further, according to the automobile 62 mounted with a plurality of the tires 61, a small vehicle having a very simple structure can be provided.

According to such a configuration, if the rotor is driven to rotate, the induction rotating electric machine according to the embodiment can drive the liquid in the liquid feeding pipe to feed the liquid.

While various embodiments of the present invention have been described above, the present invention is not limited to the above-described configuration, and various modifications may be made without departing from the spirit of the present invention.

For example, in the above-described embodiment, the system shown in fig. 1 is applied to an aircraft, but the system is not limited to this, and may be applied to any application object as long as it is an application object that requires propulsion. For example, it can be applied to an automobile (fig. 17) or a train.

In the above-described embodiment, the propeller blades/fins are used as the method for generating the propulsive force, but any device may be used as long as the propulsive force is generated by the rotation of the rotor. When these fins or fins are used as the heat dissipating device, any structure may be used as long as the surface area is increased, and for example, a honeycomb structure may be used.

When the driving force of the superconducting induction motor of the present invention is transmitted in contact with an object such as the ground, the driving force may be transmitted not only to the tire as shown in fig. 17 but also to a structure in which a crawler or a gear is attached as a propulsion force generator.

Description of the symbols

1 … superconducting induction motor

2 … full superconducting system

3 … gas turbine engine

4 … superconducting generator

5 … superconducting inverter/superconducting cable

6 … refrigerator

10 … demonstration system

11 … Propeller blade

11a … base

11b … distal end portion

12 … base

13 … Linear guide

14 … stator

15 … superconductor armature coil

16 … stator frame

17 … power supply lead

18 … rotor

22 … high electrical conductor layer

23 … magnet layer

25 … armature coil

26 … stator frame

26a … peripheral wall

26b … Upper wall portion

26c … lower wall part

27 … superconducting armature coil

28 … stator

29 … Power cord

30 … rotor

31 … center shaft

32 … propeller blade

33 … Container

35 … Main body

36 … superconducting armature coil

37 … core

38 … superconducting winding material

39 … conductor layer

40 … magnet layer

42. 43 … cover

45 … superconducting wire

46. 47 … short circuit ring

52 … copper ring material

53 … superconductor wire

54 … superconductor wire

55 … liquid feeding pump

56 … liquid delivery tube

57 … stator

58 … rotor

59 … superconducting armature coil

60 … propeller fin

61 … tyre

62 … automobile (small vehicle).