JP6800475B2 - Superconducting rotating machine - Google Patents

Description

The present invention relates to a superconducting rotating machine in which a coil is formed of a superconducting wire.

Development of superconducting rotating machines such as superconducting motors and superconducting generators began around 1960 after the discovery of type II superconductors. Initially, there was a worldwide competition to develop high-power superconducting rotors with liquid helium cooling, but in recent years, liquid nitrogen cooling using high-temperature superconducting wires and superconducting motors with refrigerators have been developed. It is now being held in each country. However, these superconducting rotors have a structure in which the coil of a normal rotor is replaced with a superconducting wire, and the main purpose is to obtain a large output by reducing copper loss. It was developed as. That is, these superconducting rotors cannot be said to fully utilize the properties of superconductors, and are not necessarily highly practical when considering their output characteristics and energy required for cooling. It was.

In view of such circumstances, the present inventor has so far proposed the superconducting rotating machine of Patent Document 1. In the superconducting rotor of Patent Document 1, as shown in FIG. 5 and the like of the same document, the superconducting wire 22 forming the coil 22 is wound around the annular portion of the stator 2 formed in an annular shape (doughnut shape). It has become a thing. As the superconducting wire 22, a tape-shaped one containing a type II superconductor is adopted (see paragraph 0030 of the same document). The superconducting rotor of the same document has a structure in which a stator 2 and a rotor 3 having a permanent magnet 32 are arranged so as to face each other in the vertical direction, and can be miniaturized and the rotor 3 can be miniaturized. The utilization efficiency of the Lorentz force (in the case of a superconducting motor) exerted by the magnetic field of the permanent magnet 32 provided in the coil 22 on the current flowing through the coil 22 and the fluctuating magnetic field generated by the permanent magnet 32 provided in the rotor 3 are generated in the coil 22. The utilization efficiency of the electromagnetic induction action (in the case of a superconducting generator) was high. In addition, since the coils 22 of each phase are aligned in the same direction on the annulus and have a structure capable of canceling self-induction, the coil 22 rotates at a higher speed than the conventional superconducting rotors. Even at that time, the decrease in torque was small, and a high output density could be achieved.

Japanese Unexamined Patent Publication No. 2011-239596

However, the superconducting rotary machine of Patent Document 1 has room for improvement in its output efficiency. This is because when an alternating magnetic field is applied to the superconducting wire 22 containing the type II superconductor, a hysteresis loss (AC loss) is generated in the superconducting wire 22 due to the pinning force of the superconductor. Because. This loss increases as the magnetic field applied to the tape-shaped superconducting wire 22 has a larger vertical component with respect to the superconducting wire 22 (a component perpendicular to the tape surface of the superconducting wire 22). The "tape surface" referred to here is the surface of the tape-shaped superconducting wire 22 that has a wider width. In this regard, in the superconducting rotor of Patent Document 1, as shown in FIG. 8 of the same document, the magnetic field generated by the permanent magnet 32 provided in the rotor 3 is substantially applied to the tape surface of the superconducting wire 22. Since it was applied vertically, the AC loss of the superconducting wire 22 was large. If this AC loss can be reduced, the output efficiency of the superconducting rotating machine can be further improved.

The present invention has been made to solve the above problems, and provides a superconducting rotating machine (superconducting motor or superconducting generator) having a small AC loss of a superconducting wire and excellent output efficiency. is there.

The above issues are
The core member that forms a ring and
A superconducting rotating machine made of a tape-shaped member formed of a superconducting material and equipped with a superconducting wire wound around an annular portion of a core member.
The core member is formed in a flat plate annular shape having an upper surface and a lower surface substantially parallel to each other, and
In the tape-shaped superconducting wire, the upper portion arranged on the upper surface side and the lower portion arranged on the lower surface side of the core member are substantially parallel in the width direction and the thickness direction of the core member. It is solved by providing a superconducting rotating machine characterized by being arranged.

Here, the terms "upper" and "lower" in the description "the core member has a substantially parallel upper surface and the lower surface" and the description "upper surface side of the core member" are used for convenience of explanation. Only one is used as "upper" and the other as "lower" in the thickness direction of the above, and the direction in which the superconducting rotating machine of the present invention is used is not limited. In the following, the same shall apply to the use of words indicating directions such as "up" and "down" unless otherwise specified.

The superconducting rotor of the present invention can provide a superconducting rotor (superconducting motor or superconducting generator) having a small AC loss of the superconducting wire and excellent output efficiency. That is, the upper portion and the lower portion of the tape-shaped superconducting wire are arranged so that the width direction thereof and the thickness direction of the core member are substantially parallel (the width direction faces the vertical direction). Therefore, when an alternating magnetic field in the vertical direction is applied to the alternating magnetic field, the vertical component of the alternating magnetic field with respect to the superconducting wire can be reduced, and the AC loss can be suppressed to a small value. Since AC loss is mainly lost as Joule heat, if this can be reduced, the output efficiency of the superconducting rotor can be improved and the cooling efficiency of the coil (superconducting wire) can be improved. It is also possible (in a superconducting rotating machine, the superconducting wire is cooled by liquid nitrogen, a refrigerator, etc. in order to keep the superconducting wire in a superconducting state). In addition, in this specification, the term "AC loss" is used exclusively to mean the hysteresis loss caused by the pinning force of the type II superconductor.

Further, since the tape-shaped superconducting wire is difficult to bend in the width direction, it can be used as a donut-shaped member having a substantially circular cross section of an annular portion like a stator in the superconducting rotating machine described in Reference 1. If you try to wind the superconducting wire in a state where the width direction is substantially parallel to the vertical direction, it is necessary to bend the entire part of the superconducting wire to be wound around the stator in the width direction of the superconducting wire. Such wrapping was virtually impossible. On the other hand, in the superconducting rotary machine of the present invention, the superconducting wire is formed in the width direction of the superconducting wire by forming the core member in a flat plate annular shape and increasing the linear portion in the cross-sectional outer shape of the annular portion of the core member. It is not necessary to bend most of the superconducting wire (upper part and lower part) even when it is intended to be wound around the core member in a state where the elements are substantially parallel in the vertical direction. In other words, the superconducting wire is wound around the core member in a state where the width direction is substantially parallel to the vertical direction by bending only a specific part (both ends of the upper part and the lower part) of the superconducting wire. You can do it.

In the superconducting rotary machine of the present invention, how the portions other than the upper portion and the lower portion of the superconducting wire are arranged is not particularly limited. This is because when a magnetic field is applied in the vertical direction to the superconducting wire wound around the core member, the Lorentz force (in the case of a superconducting motor) and the electromagnetic induction action (in the case of a superconducting generator) are exerted. What can be received is the part of the superconducting wire where the current flows in the direction perpendicular to the magnetic field, that is, mainly the upper part and the lower part, and the other parts of the superconducting wire are the superconducting motor and This is because it hardly contributes to the output of the superconducting generator. However, in order to wind the superconducting wire around the core member reasonably (without bending in the width direction) while keeping the width directions of the upper part and the lower part of the superconducting wire substantially parallel in the vertical direction, the following is required. It is preferable to adopt the configuration of.

That is,
An inner protrusion for guiding the inner portion of the superconducting wire arranged on the inner peripheral surface side of the core member and an outer portion of the superconducting wire for guiding the outer portion arranged on the outer peripheral surface side of the core member. A pair of inner and outer protrusions composed of outer protrusions is provided at a plurality of locations in the circumferential direction of the core member, and is provided.
The upper and lower parts of the superconducting wire overlap on one side of the protrusions of each set (one side of the annular core member in the circumferential direction; the same applies hereinafter), and the other side of the protrusions of each set. (The other side in the circumferential direction of the core member forming an annular shape. The same applies hereinafter.) The superconducting wire is wound around each set of protrusions with the inner and outer portions of the superconducting wire overlapping.

At this time,
The upper end of the inner protrusion and the outer protrusion are provided so as to project upward from the upper surface of the core member.
The inner protrusion and the lower end of the outer protrusion are provided so as to project downward from the lower surface of the core member.
By having ridges having a semicircular cross section on the inner surface side of the upper end portion and the inner surface side of the lower end portion of the inner protrusion portion, and the outer surface side of the upper end portion and the outer surface side of the lower end portion of the outer protrusion portion, the guide is provided at these points. It is preferable that the superconducting wire is not bent below the allowable bending radius.

As a result, the superconducting wire is wound so that the width direction of the tape-shaped superconducting wire and the direction of the magnetic flux on the upper and lower surfaces of the core member are substantially parallel without applying a load that leads to the destruction of the superconducting wire. It becomes possible. More specifically, the superconducting wire is arranged on the upper surface and the lower surface of the core member so that the width direction is substantially parallel to the direction of the magnetic flux, and the superconducting wire is formed at the ridge of the semicircular cross section of the outer protrusion. By winding along the surface in the width direction of the core member, the superconducting wire can be guided from the upper surface to the lower surface (or from the lower surface to the upper surface) of the core member at the outer protrusion. In the inner protrusion as well, the surface of the superconducting wire is guided along the surface of the ridge portion having a semicircular cross section arranged above and below the inner protrusion, so that the surface of the superconducting wire is guided from the lower surface to the upper surface of the core member. Alternatively, the superconducting wire can be guided from the upper surface to the lower surface). At this time, it is preferable that the radius of the semicircular cross section does not become less than the allowable bending radius of the superconducting wire.

The shape of the ridge portion is not particularly limited as long as the ridge portion has a semicircular cross section and the superconducting wire guided along the ridge portion does not bend below the allowable bending radius. However, it is preferable that the ridges provided at the upper end and the lower end of the inner protrusion and the outer protrusion have an inclination angle of 45 ° with respect to the upper surface and the lower surface of the core member. As a result, the direction of the superconducting wire guided to the ridge portion can be easily changed in a substantially right-angled direction, and the transition between the upper portion or the lower portion and the inner portion or the outer portion can be smoothly performed.

In the superconducting rotating machine of the present invention, the upper portion and the lower portion of the superconducting wire are parallel to the width direction thereof and the thickness direction of the core member (usually, the direction of the magnetic field by the "permanent magnet" described later (vertical direction)). ) May be arranged so as to be substantially parallel to each other, but more preferably, the angle formed by the width direction of the upper portion and the lower portion of the superconducting wire and the thickness direction of the core member is 10 °. It should be as follows. As a result, when an alternating magnetic field in the vertical direction is applied to the superconducting wire, the vertical component of the alternating magnetic field with respect to the superconducting wire can be made smaller, and the AC loss of the superconducting wire can be suppressed to be smaller. It is more preferable that the angle formed by the width direction of the upper portion and the lower portion of the superconducting wire and the thickness direction of the core member is 5 ° or less.

In the superconducting rotary machine of the present invention, the configurations other than the core member and the superconducting wire are particularly limited as long as the magnetic field is applied to the upper portion and the lower portion of the superconducting wire from the vertical direction. Not done. However, the superconducting rotor of the present invention further includes a pair of upper and lower rotors provided with permanent magnets, and a pair of rotors arranged above and below the core member around which the superconducting wire is wound form an annular shape. It is preferable that the core member is rotatably supported with the center line as the center of rotation. In other words, it is preferable that the superconducting rotary machine of the present invention is a 1-stator / 2-rotor type axial gap type rotary machine. By adopting a structure in which the rotor sandwiches the stator (core member and superconducting wire) from above and below, the magnetic field of the permanent magnet provided in the rotor flows through the superconducting wire, as will be described later. Utilization efficiency of Lorentz force on electric current (in the case of superconducting motor) and utilization efficiency of electromagnetic induction action generated in superconducting wire by fluctuating magnetic field by permanent magnet provided in rotor (in case of superconducting generator) The height can be increased, and the superconducting rotor can be miniaturized.

As described above, according to the present invention, it is possible to provide a superconducting rotating machine (superconducting motor or superconducting generator) having a small AC loss of a superconducting wire and excellent output efficiency.

The superconducting motor according to the present embodiment is a sectional view showing a state taken along a plane including the center line A ₁ of the output shaft. It is a perspective view which shows the state which disassembled the superconducting motor of this embodiment in the vertical direction. It is a top view of the stator in the superconducting motor of this embodiment. It is a perspective view of the core substrate in the superconducting motor of this embodiment. It is a perspective view which shows the state of winding the superconducting wire forming a coil around a core member. FIG. 5 is a cross-sectional view of the core member and the superconducting wire in FIG. 5 cut along a plane orthogonal to the upper portion and the lower portion of the superconducting wire. It is sectional drawing which showed the cross section which cut | cut the superconducting motor of this embodiment by the arc plane α in FIG. It is a figure which showed the result of having analyzed the magnetic field generated around the motor gap of the superconducting motor of this embodiment by the finite element method. It is a figure which showed typically the circuit structure of the superconducting motor of this embodiment.

A preferred embodiment of the superconducting rotary machine of the present invention will be described more specifically with reference to the drawings. In the following, the case where the superconducting rotor of the present invention is used as a superconducting motor will be described, but the superconducting rotor of the present invention can also be used as a superconducting generator.

Figure 1 is a sectional view showing a state in which the superconducting motor taken along a plane including the center line A ₁ of the output shaft 10 of the present embodiment. FIG. 2 is a perspective view showing a state in which the superconducting motor of the present embodiment is disassembled in the vertical direction. In FIG. 2, for convenience of illustration, the coil 60 formed of the superconducting wire 64 is omitted. FIG. 3 is a plan view of the stator 70 in the superconducting motor of the present embodiment. FIG. 4 is a perspective view of the core substrate 81 in the superconducting motor of the present embodiment. FIG. 5 is a perspective view showing how the superconducting wire 64 forming the coil 60 is wound around the core member 80. FIG. 6 is a cross-sectional view of the core member 80 and the superconducting wire 64 in FIG. 5 cut along a plane orthogonal to the upper portion 64a and the lower portion 64b of the superconducting wire 64. FIG. 7 shows the superconducting motor of the present embodiment as an arcuate surface α (an arcuate surface having points P ₁ , P ₂ , Q ₂ and Q ₁ as vertices. Sides P ₁ P ₂ and Q ₁ Q ₂ are is a sectional view showing a section cut by constituting a centering on the rotation center line a ₁ arc.). In FIG. 7, the coil 60 is schematically drawn for convenience of illustration. Figure 8 is a diagram of the magnetic field generated in the motor gap G _1, G ₂ around the superconducting motor of the present embodiment showing the results of analysis by the finite element method. FIG. 9 is a diagram schematically showing a circuit configuration of the superconducting motor of the present embodiment.

As already described, the superconducting rotating machine (superconducting motor and superconducting generator) of the present invention is
In the tape-shaped superconducting wire 64, the width direction and the thickness direction of the core member 80 are substantially parallel to the upper portion arranged on the upper surface side and the lower portion arranged on the lower surface side of the core member 80. By arranging them in such a manner, the AC loss generated in the superconducting wire 64 can be suppressed to a small value, and this configuration is adopted in the superconducting motors shown in FIGS. 1 to 9. By doing more
[1] The thermal stability of the coil 60 provided in the stator 70 can be enhanced, and the reduction of the critical current of the coil 60 can be suppressed.
[2] The efficiency of using Lorentz force can be improved.
[3] The self-inductance of the coil 60 can be suppressed, and
[4] The influence of the induced current due to the self-inductance of the coil 60 of each phase can be suppressed.
It is also possible to play the effect.

In the following, the superconducting motor of the present embodiment will be described with the positive side in the z-axis direction as the "upper" side and the negative side in the z-axis direction as the "lower" side in the drawing (FIG. 1 and the like). However, as already mentioned, the terms "upper" and "lower" are used for convenience to indicate the relative positional relationship of each member, and the absolute positional relationship of each member (this implementation). It does not limit the orientation in which the superconducting motor of the embodiment is used).

1. 1. Outline of the superconducting motor As shown in FIG. 1, the superconducting motor of the present embodiment includes a pair of rotors 40 and 50 provided with permanent magnets 20 and 30 and a coil 60 formed of a superconducting wire 64. A pair of rotors 40, which are provided with stators 70 provided for each phase and are arranged on both sides of the stator 70 by the reaction force of the Lorentz force exerted on the current flowing through the coil 60 by the magnetic field generated by the permanent magnets 20 and 30. 50 is turned to that of the axial gap type which is adapted to rotate about the rotational center line a ₁ of the rotor.

The permanent magnet 20 provided on one rotor 40 and the permanent magnet 30 provided on the other rotor 50 face the same poles (the north pole of the permanent magnet 20 faces the north pole of the permanent magnet 30 and is permanent. The south pole of the magnet 20 faces the south pole of the permanent magnet 30).

As shown in FIG. 2, the stator 70 has a flat plate annular shape and is fitted into the core base 81 having a plurality of protrusions 81a and 81b on the inner peripheral surface and the outer peripheral surface thereof and the upper and lower surfaces of the core base 81, respectively. It is provided with a core member 80 composed of a pair of upper and lower magnetic cores 82 which are fixed (see also FIG. 1). Although omitted in FIG. 2, the stator 70 is provided with a plurality of coils 60 formed of a tape-shaped superconducting wire 64, as shown in FIG. As shown in FIG. 5, the superconducting wire 64 forming the coil 60 has an upper portion 64a arranged on the upper surface side of the core member 80 and a lower portion 64b arranged on the lower surface side of the core member 80. It is wound around the core member 80 in a state of being substantially parallel to the thickness direction (vertical direction, parallel to the z-axis direction in the drawing). As a result, as shown in FIG. 7, the direction of the magnetic field (direction of the magnetic flux density B) by the permanent magnets 20 and 30 provided on the rotors 40 and 50 is substantially parallel to the tape surface of the superconducting wire 64. Therefore, the AC loss generated in the superconducting wire 64 can be suppressed to a small value.

In the superconducting motor of the present embodiment, the pair of rotors 40, 50 and stator 70 are housed in a closed container 90 as shown in FIG. A vacuum pump (not shown) is connected to the closed container 90 via a valve (not shown), and the inside of the closed container 90 is maintained in a vacuum or a reduced pressure state close to vacuum when the superconducting motor is driven. You can do it. As a result, it is possible to prevent heat from being transferred from the outside of the closed container 90 to the stator 70 so that the temperature of the coil 60 does not rise due to the outside air.

Hereinafter, each member constituting the superconducting motor of the present embodiment will be described in detail.

2. 2. Rotor The rotor 40 and the rotor 50 are arranged so as to face each other (upper surface side and lower surface side of the stator 70) with the stator 70 interposed therebetween, as shown in FIG. The central portion of the rotor 40 and the central portion of the rotor 50 are both integrally fixed to the output shaft 10, and a rotational force around the rotation center line A ₁ is generated on the rotor 40 and the rotor 50. Then, the output shaft 10 is rotated. The output shaft 10 is rotatably attached to the closed container 90 via the seal bearing 100. The form of the rotor 40 and the rotor 50 is not particularly limited as long as the permanent magnet 20 and the permanent magnet 30 described later can be provided, respectively. In the superconducting motor of the present embodiment, as shown in FIG. 2, the rotor 40 and the rotor 50 are both forms an rotationally symmetrical disc-shaped with respect to the rotation center line A _1. A permanent magnet 20 is provided on the lower surface of the rotor 40, and a permanent magnet 30 is provided on the upper surface of the rotor 50.

A plurality of permanent magnets 20 and a plurality of permanent magnets 30 are provided for each of the rotor 40 and the rotor 50, respectively. The number of permanent magnets 20 and the number of permanent magnets 30 are usually the same. In the superconducting motor of the present embodiment, as shown in FIG. 2, the permanent magnets 20 are composed of a total of four permanent magnets 21, 22, 23, 24, and the permanent magnets 30 are composed of a total of four permanent magnets 30. It is composed of permanent magnets 31, 32, 33 and 34.

The form of the permanent magnets 21 to 24 is not particularly limited, and each of the permanent magnets 21 to 24 may have a different form, but usually they have the same shape. In the superconducting motor of the present embodiment, the permanent magnets 21 to 24 each have a strip shape along an arc of a quadrant, one of the upper surface or the lower surface thereof has an N pole, and the other is S. It is a pole. In the figure, the north pole side of the permanent magnets 21 to 24 is shown by dense (small mesh) shaded hatching, and the south pole side is shown by coarse (large mesh) shaded hatching. This also applies to the permanent magnets 31 to 34 described later. Permanent magnets 21 to 24, the magnetic poles of the permanent magnets 21 to 24 adjacent to alternating, are arranged rotationally symmetrically around the rotation center line A _1. The method of fixing the permanent magnets 21 to 24 to the rotor 40 is not particularly limited, but in the superconducting motor of the present embodiment, the permanent magnets 21 to 24 are fitted into the annular groove 41 provided on the lower surface of the rotor 40. are fixed in a state (see arrow a ₂ in FIG. 2).

The form of the permanent magnets 31 to 34 is also not particularly limited, but is usually the same as that of the permanent magnets 21 to 24, respectively. Also in the superconducting motor of the present embodiment, the permanent magnets 31 to 34 have a strip shape along a quadrant arc having the same shape as the permanent magnets 21 to 24, respectively, and are on the upper surface or the lower surface thereof. One is the north pole and the other is the south pole. The permanent magnets 31 to 34 are arranged at positions where they overlap the permanent magnets 21 to 24 in the vertical direction (z-axis direction), respectively. At this time, the permanent magnet 21 and the permanent magnet 31, the permanent magnet 22 and the permanent magnet 32, the permanent magnet 23 and the permanent magnet 33, and the permanent magnet 24 and the permanent magnet 34, which overlap in the vertical direction, have the same poles facing each other. Are placed facing each other. The method of fixing the permanent magnets 31 to 34 to the rotor 50 is also not particularly limited, but in the superconducting motor of the present embodiment, the permanent magnets 31 to 34 are fitted into the annular groove 51 provided on the upper surface of the rotor 50. are fixed in a state (see arrow a ₃ in FIG. 2).

3. 3. Stator In the superconducting motor of the present embodiment, the stator 70 includes a core member 80 and a coil 60, as shown in FIG. The coil 60 is formed by winding a tape-shaped superconducting wire 64 around a core member 80. As shown in FIG. 2, the core member 80 is composed of a core base 81 and a magnetic core 82. The core substrate 81, as shown in FIG. 4, which constitutes a vertical annular to the rotational center line A _1, a plurality of inner projections 81a provided on the inner peripheral surface thereof, provided on the outer peripheral surface It has a plurality of outer protrusions 81b. In the inner protrusion 81a and the outer protrusion 81b, when the superconducting wire 64 forming the coil 60 is wound around the core member 80, the upper portion 64a (FIG. 5) and the lower portion 64b of the superconducting wire 64 are vertically oriented (in the vertical direction). It is for guiding the superconducting wire 64 so as to be substantially parallel to the z-axis direction). The number of inner protrusions 81a and the number of outer protrusions 81b are not particularly limited, but are usually the same. In the core base 81 of the present embodiment, as shown in FIG. 4, a pair of inner and outer protrusions formed by one inner protrusion 81a and one outer protrusion 81b is formed in the circumferential direction of the core base 81. Twelve places are provided along the line. The output shaft 10 (FIG. 1) is inserted into the opening 81c at the center of the core substrate 81 in a rotatable state.

As shown in FIG. 2, the magnetic core 82 includes a first magnetic core 82a provided on the upper surface side of the core substrate 81 and a second magnetic core 82b provided on the lower surface side of the core substrate 81. Has been done. In other words, the magnetic cores 82a and 82b form the upper and lower surfaces of the core member 80, and the core base 81 forms the intermediate portion of the stator 70 in the plate thickness direction. The method of fixing the first magnetic core 82a to the core substrate 81 is not particularly limited, but in the superconducting motor of the present embodiment, the first magnetic core 82a is provided in the annular groove 81d provided on the upper surface of the core substrate 81. are fixed in a state of being fitted (see arrow a ₄ in FIG. 2). Further, the method of fixing the second magnetic core 82b to the core substrate 81 is also not particularly limited, but in the superconducting motor of the present embodiment, the second is provided in the annular groove (not shown) provided on the lower surface of the core substrate 81. It is fixed in a state of fitting the magnetic core 82b (see arrow a ₅ in FIG. 2).

The core substrate 81 is supported in a stationary state with respect to the closed container 90 (FIG. 1). The structure for supporting the core base 81 in the closed container 90 is not particularly limited, but in the superconducting motor of the present embodiment, it is attached to the outer end of each outer protrusion 81b (FIG. 4) provided on the core base 81. The core substrate 81 is supported in a stationary state with respect to the closed container 90 via a PBI support rod (not shown).

The core substrate 81 is for holding the coil 60 as shown in FIG. 3, and can also cool the coil 60 by making thermal contact with the coil 60. The core substrate 81 is connected to the cold heat supply source 110 via a heat transfer portion 81e (FIG. 2) provided so as to project outward from the outer peripheral portion thereof. The cold heat supply source 110 is for supplying cold heat to the core base 81, and together with the core base 81, functions as a coil cooling means for cooling the coil 60. The cold heat supply source 110 is not particularly limited as long as it can cool the coil 60 to a low temperature region where a superconducting phenomenon occurs. In the superconducting motor of this embodiment, a refrigerator is used as the cold heat supply source 110. If the one cold source 110 cooling can not keep up may also be provided at a plurality of locations of the cold source 110 (typically, rotationally symmetrical plurality of positions with respect to the rotation center line A ₁ of the rotor 40, 50) ..

As the core substrate 81, it is preferable to use one made of a metal having excellent thermal conductivity. Specifically, it is preferable to form the core substrate 81 from a metal having a thermal conductivity of 200 WmK- ¹ or more at 0 ° C. Aluminum (236 W ・ m ^-1・ K ^-1 ), copper (403 W ・ m ^-1 , K ^-1 ) and the like are examples of metals having a thermal conductivity of 200 W ・ m ^-1・ K ^-1 or more at 0 ° C. Illustrated. In the superconducting motor of this embodiment, the core substrate 81 is made of aluminum.

Like the core substrate 81, the heat transfer portion 81e is also made of a metal having excellent thermal conductivity. In the superconducting motor of this embodiment, the heat transfer portion 81e is formed by a platinum resistance temperature detector. This platinum resistance temperature detector (heat transfer unit 81e) not only transfers the cold heat generated by the cold heat supply source 110 to the core substrate 81, but also functions as a temperature measuring means for measuring the temperature of the core substrate 81. It has become like. The temperature measuring means of the core substrate 81 is also provided at other locations on the outer peripheral portion of the core substrate 81 (thermocouples (not shown) are provided). These temperature measuring means are connected to a measuring instrument (not shown) provided outside the closed container 90. Therefore, by monitoring the temperature of the core substrate 81, it is possible to feedback control the cold heat supplied from the cold heat supply source 110.

The first magnetic core 82a and the second magnetic core 82b increase the magnetic flux density due to the permanent magnets 20 and 30, and the direction of the magnetic field (direction of the magnetic flux density B) due to the permanent magnets 20 and 30 are shown in FIG. It is for control as shown. By arranging the first magnetic core 82a and the second magnetic core 82b, the magnetic flux density B generated in the gap (gap G ₁ , G ₂ ) between the stator 70 and the pair of rotors 40, 50 The orientation is substantially orthogonal to the upper surface of the magnetic core 82a and the lower surface of the magnetic core 82b. Therefore, the direction of the current I ₁ (flowing toward the front side of the paper surface in FIG. 7) flowing in the upper portion 64a of the superconducting wire 64 forming the coil 60 and the current I ₂ flowing in the lower portion 64b (FIG. 7). flows towards the verso side. the orientation of the) direction and is substantially perpendicular to the magnetic flux density B, the rotational force _{F 1} of the rotor 40, 50 ', _{F 2'} Lorentz force _F 1, _{F 2} of the original it is possible to (a reaction force of the Lorentz force F _1, F ₂ is the rotational force F _{1 ',} F 2' becomes.) to increase the rotation direction component of the. Therefore, it is possible to increase the output efficiency of the superconducting motor. The magnetic field generated around the gap G _1, G ₂ in the superconducting motor of the present embodiment was analyzed by the finite element method, the result shown in FIG. 8 is obtained. Looking at the magnetic flux formed by the permanent magnets 21 and 31 in FIG. 8, it can be seen that the magnetic flux lines are considerably close to the state shown in FIG.

Further, by which it arranged the first magnetic core 82a and the second magnetic core 82b, even if a wide gap G _1, G _2, the effects described above are achieved. Therefore, by securing a wide gap G ₁ and G ₂ , as shown in FIG. 1, it is possible to arrange a thick heat insulating material 120 (a heat insulating material having a high heat insulating effect) in the gaps G ₁ and G _2. Therefore, the cooling efficiency and heat insulating efficiency of the stator 70 provided with the coil 60 can be improved. In the superconducting motor of the present embodiment, a super insulator having a multi-layer structure is used as the heat insulating material 120. The heat insulating material 120 is shown only in FIG. 1, and is omitted in other drawings.

Form of the first magnetic core 82a and the second magnetic core 82b is not particularly limited as long as it substantially perpendicular flat annular respect to the rotation center line A _1. Here, the "flat plate annular" refers to an annular member having a width W ₁ (FIG. 2) larger than a thickness T ₁ (FIG. 2) in the annular portion. Further, the "ring" in the "flat plate ring" may be an open ring in which a part of the ring portion is cut off, but usually, the ring portion is a continuous closed ring. Further, the "ring" in the "flat plate ring" is not limited to an annular portion whose annular portion forms a perfect circle, and also includes an annular shape other than the annular portion, such as a polygonal ring whose annular portion forms a polygon. Furthermore, the first magnetic core 82a and the second magnetic core 82b do not necessarily have the same form, but usually have the same form. In the superconducting motor of the present embodiment, the first magnetic core 82a and the second magnetic core 82b are both perpendicular to the rotational center line A _1, and rotation with respect to the rotation center line A ₁ It has a symmetrical flat plate annulus.

The type of magnetic material used for the magnetic material cores 82a and 82b is not particularly limited. Examples of the magnetic material that can be used for the magnetic material cores 82a and 82b include ferrite such as barium ferrite, stainless steel such as SUS430, chromium oxide, cobalt, iron oxide and the like. However, when it is assumed that the rotors 40 and 50 are rotated at high speed, it is preferable to use a magnetic material having extremely small eddy current loss and hysteresis loss. Specifically, the magnetic cores 82a and 82b are made of a magnetic material capable of suppressing the hysteresis loss and the eddy current loss in the magnetic cores 82a and 82b within the range not exceeding the cooling capacity of the cold heat supply source 110 (coil cooling means). It is preferable to form it. More preferably, considering the energy required for cooling, it is preferable to form the magnetic cores 82a and 82b with a magnetic material having a maximum loss of about 10 kW / m ³ or less under usage conditions. Examples of such magnetic materials include thin-wound iron cores and ferrites. This makes it possible to maintain high output efficiency even when the rotors 40 and 50 are rotated at high speed.

4. Coil coil 60, as shown in FIG. 3, the respective positions dividing the stator 70 in the circumferential direction, are provided so as to be rotationally symmetrical with respect to the rotation center line A ₁ of the rotor. The plurality of coils 60 are configured to be divided into a plurality of phases, and currents that are out of phase with each phase flow. The number of phases of the coil 60 is usually 2 or more, preferably 3 or more. However, if the number of phases of the coil 60 is increased too much, the electronic circuit becomes complicated and the cost increases. Therefore, the number of phases is usually up to about 24, preferably 12 or less, and more preferably 6 or less. In the superconducting motor of this embodiment, twelve coils 61a, 61b, 61c, 61d, 62a, 62b, 62c, 62d, 63a, 63b, 63c, 63d are provided in three phases. Specifically, the coils 61a, 61b, 61c, 61d are the first phase, the coils 62a, 62b, 62c, 62d are the second phase, and the coils 63a, 63b, 63c, 63d are the third phase. The coils 60 having the same phase are arranged at opposite positions on the stator 70 forming an annular shape.

By the way, in the present specification, for convenience of explanation, the reference numerals of the coils are "60", "61", "62", "63", "61a", "61b", "61c", "61d", and "61d". 16 types of "62a", "62b", "62c", "62d", "63a", "63b", "63c" and "63d" are used. These codes are used properly as follows. That is, when each coil is specifically referred to, the reference numerals "61a", "61b", "61c", "61d", "62a", "62b", "62c", "62d", "63a", "63b", "63c" and "63d" are used. When referring to all the coils (coil 61a, coil 61b, coil 61c and coil 61d) constituting the first phase, the reference numeral "61" is used, and all the coils (coils 62a, coil 62b) constituting the second phase are used. , Coil 62c and coil 62d) are used with reference numeral "62", and with reference to all coils (coil 63a, coil 63b, coil 63c and coil 63d) constituting the third phase, reference numeral "63" is used. ing. Further, all the coils (first phase coil 61a, coil 61b, coil 61c and coil 61d, second phase coil 62a, coil 62b, coil 62c and coil 62d, and third phase coil 63a, coil 63b, When the coil 63c and the coil 63d) are shown without particular distinction, the reference numeral "60" is used.

Each coil 60 is formed by winding a tape-shaped superconducting wire 64 around an annular portion of the core member 80. As shown in FIG. 5, in the superconducting wire 64, the inner portion 64c arranged on the inner peripheral surface side of the core member 80 is guided by the inner protrusion 81a of the core base 81 and arranged on the outer peripheral surface side of the core member 80. By guiding the outer portion 64d to be formed to the outer protrusion 81b of the core substrate 81, the upper portion 64a arranged on the upper surface side of the core member 80 and the lower portion 64b arranged on the lower surface side of the core member 80 The width direction is arranged substantially parallel to the thickness direction of the core substrate 81 (the z-axis direction in the drawing). The upper portion 64a and the lower portion 64b may be in a state of being inclined with respect to the radial direction of the core member 80, but if they are made parallel to the radial direction of the core member 80 as in the present embodiment, the Lorentz force It is possible to improve the utilization efficiency of.

As shown in FIG. 5, the inner protrusion 81a is provided so as to project toward the inside of the core base 81, the upper end thereof protrudes upward from the upper surface of the core base 81, and the lower end thereof is the core base 81. It has a shape that protrudes downward from the lower surface. A ridge portion 81a ₁ having a semicircular cross section is provided on the inner surface side of the upper end portion of the inner protrusion 81a so as to be inclined with respect to the upper surface of the core substrate 81, and is provided on the inner surface side of the lower end portion of the inner protrusion 81a. The ridge portion 81a ₂ having a semicircular cross section is provided so as to be inclined with respect to the lower surface of the core substrate 81. On the other hand, the outer protrusion 81b is provided so as to project toward the outside of the core base 81, its upper end portion protrudes above the upper surface of the core base 81, and its lower end portion is below the lower surface of the core base 81. It has a protruding shape. A ridge portion 81b ₁ having a semicircular cross section is provided on the outer surface side of the upper end portion of the outer protrusion 81b so as to be inclined with respect to the upper surface of the core substrate 81, and is provided on the outer surface side of the lower end portion of the outer protrusion 81b. The ridge portion 81b ₂ having a semicircular cross section is provided so as to be inclined with respect to the lower surface of the core substrate 81.

Hereinafter, a specific procedure for winding the superconducting wire 64 around the core member 80 to form the coil 60 will be described. In the following, the case where the superconducting wire 64 is wound counterclockwise toward the paper surface will be described as an example in FIG. 5, but the direction in which the superconducting wire 64 is wound may be clockwise.

First, the upper surface side of the core member 80, one side of the inner protrusions 81a and the outer protrusions 81b (the side indicated by the arrow A ₆ in the figure), the superconducting wire 64, the width direction of the core member 80 thickness It is applied so as to be substantially parallel to the vertical direction (z-axis direction in the figure) (upper portion 64a in the figure). Next, the portion of the superconducting wire 64 extending inward from the upper portion 64a is aligned with the ridge portion 81a ₁ provided at the upper end of the inner protrusion 81a, and is twisted downward in the width direction of the superconducting wire 64. To. Thus, as the superconducting wire 64 is disposed on the other side of the inner protrusions 81a and the outer protrusions 81b (the side indicated by the arrow A ₇ in the figure) (the inner portion 64c in the drawing). Subsequently, the portion of the superconducting wire 64 extending downward from the inner portion 64c is twisted in the width direction of the superconducting wire 64 along the ridge portion 81a ₂ provided at the lower end of the inner protrusion 81a. Turn outward. As a result, the superconducting wire 64 is arranged on one side of the inner protrusion 81a and the outer protrusion 81b (lower portion 64b in the drawing). Further, the portion of the superconducting wire 64 extending outward from the lower portion 64b is aligned with the ridge portion 81b ₂ provided at the lower end of the outer protrusion 81b, and is twisted upward in the width direction of the superconducting wire 64. To. As a result, the superconducting wire 64 is arranged on the other side of the inner protrusion 81a and the outer protrusion 81b (outer portion 64d in the drawing). Finally, the portion of the superconducting wire 64 extending upward from the outer portion 64d is aligned with the ridge portion 81b ₁ provided at the upper end of the outer protrusion 81b, and twisted inward in the width direction of the superconducting wire 64. Turn it around. As a result, the superconducting wire 64 is overlapped with one side of the upper portion 64a initially applied to the inner protrusion 81a and the outer protrusion 81b.

By repeating the above procedure, as shown in FIG. 3, the upper side is on one side of the inner protrusion 81a and the outer protrusion 81b (in FIG. 3, the clockwise side of each inner protrusion 81a and the outer protrusion 81b). The portion 64a and the lower portion 64b overlap, and the inner portion 64c and the outer side are on the other side of the inner protrusion 81a and the outer protrusion 81b (in FIG. 3, the counterclockwise side of each inner protrusion 81a and the outer protrusion 81b). The superconducting wire 64 is wound around the core member 80 in a state where the portions 64d are overlapped to form the coil 60. The number of turns of each coil 60 is not particularly limited, but it is preferable to increase the number of turns because the output efficiency of the conduction motor can be increased.

By forming the coil 60 as described above, as shown in FIG. 7, the magnetic field (magnetic flux density B) generated by the permanent magnets 20 and 30 provided on the rotors 40 and 50 is generated by the upper portion 64a of the superconducting wire 64. And the application is applied substantially parallel to the tape surface of the lower portion 64b. As a result, the AC loss generated in the superconducting wire 64 can be suppressed to a small value. At this time, the width directions of the upper portion 64a and the lower portion 64b do not have to be exactly parallel to the direction of the magnetic flux density B, and the output efficiency of the superconducting motor is kept sufficiently high even if it is slightly inclined. be able to. However, if the width direction of the upper portion 64a and the lower portion 64b is excessively inclined with respect to the magnetic flux density B, the AC loss may increase and the output efficiency of the superconducting motor may decrease. Therefore, the angle θ ₁ (FIG. 6) between the width direction of the upper portion 64a and the thickness direction of the core member 80 (the direction of the magnetic flux density B), the width direction of the lower portion 64b, and the thickness of the core member 80. It is preferable that the angle θ ₂ (FIG. 6) formed with the direction is 10 ° or less. As a result, the AC loss can be suppressed to 20% or less as compared with the case where the magnetic flux density B is applied substantially perpendicularly to the tape surfaces of the upper portion 64a and the lower portion 64b. In this case, the output efficiency of the superconducting motor of the present embodiment (total output efficiency including energy consumption of the cold heat supply source 110 and the like) can be set to 90% or more. The angle θ ₁ and the angle θ ₂ are more preferably 5 ° or less, and in this case, an output efficiency of 95% or more can be realized.

The ridges 81a ₁ and 81a ₂ provided on the inner protrusion 81a, and the ridges 81b ₁ and 81b ₂ provided on the outer protrusion 81b break the superconducting wire 64 within the allowable bending radius. The shape is not particularly limited as long as it can be guided while preventing it from bending. When the ridges 81a ₁ , 81a ₂ , 81b ₁ , 81b ₂ have a semicircular cross section, the cross-sectional radius is not particularly limited as long as it is equal to or greater than the allowable bending radius of the superconducting wire 64. The radial radii of the ridges 81a ₁ , 81a ₂ , 81b ₁ , 81b ₂ may be different from each other.

The inclination angles of the ridge portion 81a ₁ and the ridge portion 81b ₁ with respect to the upper surface of the core member 80 are not particularly limited, but the superconducting wire 64 may be made of the ridge portion 81a ₁ and the ridge portion 81b ₁ regardless of whether the core member 80 is made too large or too small. It becomes easy to come off from. Therefore, the inclination angles of the ridge portion 81a ₁ and the ridge portion 81b ₁ with respect to the upper surface of the core member 80 are preferably 15 ° to 75 °, more preferably 30 ° to 60 °, and further set to 40 ° to 50 °. preferable. The inclination angles of the ridge portion 81a ₂ and the ridge portion 81b ₂ with respect to the lower surface of the core member 80 are also not particularly limited, but for the same reason as described above, it is preferably 15 ° to 75 °, more preferably 30 ° to 60 °. It is more preferably 40 ° to 50 °. In the present embodiment, the inclination angle of the ridge portion 81a ₁ and the ridge portion 81b ₁ with respect to the upper surface of the core member 80 and the inclination angle of the ridge portion 81a ₂ and the ridge portion 81b ₂ with respect to the lower surface of the core member 80 are both 45 °. It is about.

In the superconducting motor of the present embodiment, the annular portion of the core member 80 around which the superconducting wire 64 forming the coil 60 is wound has a rectangular cross-sectional shape as shown in FIG. 5, so that the coil 60 The cross-sectional shape of is also substantially rectangular. The upper portion 64a and the lower portion 64b of the superconducting wire 64 contribute as sources of the Lorentz forces F ₁ and F ₂ (FIG. 7) that are the sources for rotating the rotors 40 and 50. Therefore, it is preferable that the cross-sectional shape of the coil 60 is a flat shape so that the horizontal width thereof can be secured as large as possible with respect to the vertical width. Specifically, the width of the annular portion of the core member 80 superconducting wire 64 is wound _{W 2} (Fig. 5), the ratio _W 2 / _{W 3} with respect to the longitudinal width _{W 3} preferably is 1.5 or more. The ratio W ₂ / W ₃ is more preferably 2 or more, and further preferably 2.5 or more. The upper limit of the ratio W ₂ / W ₃ is not particularly limited, but is usually 100 or less, preferably 50 or less, and practically 20 or less.

The width of the superconducting wire 64 forming the coil 60 is not particularly limited, but if it is made too narrow, the allowable current amount of the superconducting wire 64 becomes small, and in addition to making it difficult to realize a large output, the superconducting wire 64 is superconducting. The conductive wire 64 is easily cut. Therefore, the width of the superconducting wire 64 is preferably 0.5 mm or more, more preferably 1 mm or more, and further preferably 2 mm or more. On the other hand, if the width of the superconducting wire 64 is too wide, the superconducting wire 64 can hardly be bent in the width direction, and there is a risk that the superconducting wire 64 will be difficult to wind as shown in FIG. Therefore, the width of the superconducting wire 64 is preferably 20 mm or less, and more preferably 10 mm or less. The superconducting wire 64 in this embodiment has a width of about 4 mm.

As the superconducting wire 64, various wire rods made of a superconducting material can be used. Examples of the metal-based superconducting material include NbTi, Nb ₃ Sn, MgB ₂ , NbN, and the like, and examples of the oxide-based superconducting material include YBa ₂ Cu ₃ O ₄ (YBCO). Bi ₂ Sr ₂ CaCu ₂ Ox (Bi2212) and the like can be mentioned, and examples of the organic superconducting wire include β- (BEDT-TTF) 2/3, K ₃ C ₆₀ , Rb ₃ C _60, and the like. C ₆ Ca (graphite) and the like can be mentioned.

5. Wiring of the superconducting motor In the superconducting motor of this embodiment, as shown in FIG. 9, the coils 60 from the first phase to the third phase (the first phase coil 61, the second phase coil 62, and the second phase coil 62, The third phase coils 63) are connected so as to be parallel to each other for each phase. Alternating currents that are out of phase with each phase are passed through the coils 60 that form each phase. In this embodiment, the currents flowing through the coils 61, 62, and 63 are out of phase with each other by 120 °. In the superconducting motor of the present embodiment, as described above, the coils 60 of each phase are composed of a plurality of coils 60 (the first phase coil 61 is composed of four coils 61a, 61b, 61c, 61d). The second phase coil 62 was composed of four coils 62a, 62b, 62c, 62d, and the third phase coil 63 was composed of four coils 63a, 63b, 63c, 63d). The circuit for connecting these 12 coils 61a, 61b, 61c, 61d, 62a, 62b, 62c, 62d, 63a, 63b, 63c, 63d is not particularly limited, but in the present embodiment, the circuit is not particularly limited. , The wiring is done as follows.

That is, the coil 61a, the coil 61b, the coil 61c and the coil 61d forming the first phase coil 61 are connected in series, and the coil 62a, the coil 62b, the coil 62c and the coil 62d forming the second phase coil 62 are connected in series. The coil 63a, the coil 63b, the coil 63c, and the coil 63d forming the third phase coil 63 are connected in series. As shown in FIG. 3, the coil 61a, the coil 61b, the coil 61c, and the coil 61d constituting the coil 61 of the first phase are arranged so that the coil 61a and the coil 61b are adjacent to each other, and are located at positions facing the coil 61a. The coil 61c and the coil 61d are arranged so as to be adjacent to each other. In addition, the winding direction of the coil 61a and 61b (the winding direction of the superconducting wire 64) and the winding direction of the coil 61c and the coil 61d (the winding direction of the superconducting wire 64) of the stator 70. It is made to align with the orbital direction. The coils 62a, 62b, coil 62c and coil 62d that make up the second phase coil 62, and the coils 63a, coil 63b, coil 63c and coil 63d that make up the third phase coil 63 are also the first phase coils. It is arranged in the same manner as the coil 61a, the coil 61b, the coil 61c and the coil 61d constituting the 61.

When the coils 60 of each phase are connected as described above, the sum of the currents I ₁ (t), I ₂ (t), and I ₃ (t) flowing through the coils 61, 62, 63 of each phase I ₁ (t) + I _{It is possible to make 2} (t) + I ₃ (t) always 0 so that the sum of the self-inductances of the coils 61, 62, 63 of each phase is always 0 (coil 61 of each phase). , 62, 63 self-inductance is given by the time derivative of the currents I ₁ (t), I ₂ (t), I ₃ (t)). In other words, the self-inductance of the coils 61, 62, 63 can be canceled by using the mutual inductance from other phases. Therefore, it is possible to generate torque regardless of the rotation speed, and it is also possible to simultaneously realize maximum efficiency, maximum torque, maximum power factor control, and the like.

6. Applications The superconducting rotary machine (superconducting motor and superconducting generator) of the present invention is not limited in its application, and can be suitably adopted in various fields. Since the superconducting rotary machine of the present invention has high output efficiency, it can be suitably used in applications requiring a large output. Examples of such applications include applications as drive mechanisms in transportation equipment such as automobiles, ships, trains, aircraft or elevators, and applications as various generators such as wind power generation, hydroelectric power generation, and thermal power generation. Will be done.

In particular, in the superconducting rotor of the present invention, if the magnetic core is made of a magnetic material having extremely small eddy current loss and hysteresis loss, high output at high speed rotation, which has been considered impossible until now, becomes possible. Therefore, it is not impossible to replace the jet engine used in the aircraft with a superconducting motor, and it is expected that a high-efficiency electric jet aircraft will be realized by using a fuel cell. Further, since the superconducting rotary machine of the present invention can maintain high efficiency even when the rotation speed and the rotation torque fluctuate greatly, it depends on the drive mechanism of the elevator, the wind power generator, and the braking of the automobile. It can also be suitably used in applications such as an energy recovery mechanism in which the rotation speed and rotation torque fluctuate greatly.

10 Output shaft 20 Permanent magnet 30 Permanent magnet 40 Rotor 41 Ring groove 50 Rotor 51 Ring groove 60 Coil 64 Superconducting wire 64a Upper part 64b Lower part 64c Inner part 64d Outer part 70 Stator 80 Core member 81 Core base 81a Inner protrusion 81a ₁ Ridge 81a ₂ Ridge 81b Outer protrusion 81b ₁ Ridge 81b ₂ Ridge 81c Opening 81d Ring groove 81e Heat transfer part 82 Magnetic core 82a First magnetic core 82b Second magnetic Core 90 Sealed container 100 Sealed bearing 110 Cold heat supply source 120 Insulation material A ₁ Center line of output shaft (rotor center line of rotor)

Claims (6)

The core member that forms a ring and
A superconducting rotating machine having a superconducting wire Do that from a tape-shaped member formed by a superconducting material,
The core member is formed in a flat plate annular shape having an upper surface and a lower surface substantially parallel to each other, and
The upper portion of the superconducting wire arranged on the upper surface side of the core member, the inner portion arranged on the inner peripheral surface side of the core member, the lower portion arranged on the outer surface side of the core member, and the core member. It is wound around the annular portion of the core member in a state where the outer portion arranged on the outer peripheral surface side is repeatedly formed.
Upper portion及Beauty lower part that put the superconducting wire constituting a tape shape, a superconducting rotating machine, characterized in that the thickness direction of the width direction and the core member is arranged to be substantially parallel ..
An inner protrusion for guiding the inside portion that put the superconducting wire, pair of inner and outer projections of the set composed of the outer projecting portion for guiding the outer side portion that put the superconducting wire, Provided at multiple locations in the circumferential direction of the core member
The upper and lower parts of the superconducting wire overlap on one side of the protrusions of each set, and the inner and outer parts of the superconducting wire overlap on the other side of the protrusions of each set. The superconducting rotating machine according to claim 1, wherein a superconducting wire is wound around each of the protrusions of the set.
The upper end portion of the inner protrusion portion and the outer protrusion portion is provided so as to project upward from the upper surface of the core member.
The inner protrusion and the lower end of the outer protrusion are provided so as to project downward from the lower surface of the core member.
By having ridges having a semicircular cross section on the inner surface side of the upper end portion and the inner surface side of the lower end portion of the inner protrusion portion, and the outer surface side of the upper end portion and the outer surface side of the lower end portion of the outer protrusion portion, respectively, the guide is provided at these points. The superconducting rotating machine according to claim 2, wherein the superconducting wire is prevented from bending below an allowable bending radius.
The superconducting rotary machine according to claim 3, wherein the ridges provided at the upper end and the lower end of the inner protrusion and the outer protrusion have an inclination angle of 45 ° with respect to the upper surface and the lower surface of the core member.
The superconducting rotary machine according to any one of claims 1 to 4, wherein the angle formed by the width direction of the upper portion and the lower portion of the superconducting wire and the thickness direction of the core member is 10 ° or less.
Further equipped with a pair of upper and lower rotors equipped with permanent magnets,
The invention according to any one of claims 1 to 5, wherein a pair of rotors arranged above and below the core member around which the superconducting wire is wound are rotatably supported around the center line of the core member forming an annular shape. Superconducting rotor.