JP2017220997A - Magnetic field superconducting rotary machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnetic field superconducting rotary machine, capable of expanding a core width and thereby improving the performance, without dividing a rotor core.SOLUTION: A magnetic field superconducting rotary machine comprises: a spider 12 holding a shaft 11; a rotor core 13 which is arranged to an external periphery surface of the spider 12 in a radial state so as to have a same number of an electrode, and is projected toward the outer side of a rotor radial direction; a vacuum chamber 14 in which a half of the number of electrode is radially arranged to the rotor core 13 which is located every other one to a rotor circumference direction in the external periphery surface of the spider 12 so as to surround the side surface, and includes an inner periphery surface 14a with a width larger than the maximum width of the rotor core 13; and a superconducting coil 15 of the half number of the electrode, which is stored in the vacuum chamber 14 along the inner periphery surface 14a.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a field superconducting rotating machine, and more particularly to a superconducting coil provided in a field superconducting rotating machine and a shape of a vacuum heat insulating container surrounding the superconducting coil.

  For example, the following Patent Documents 1 to 4 disclose techniques relating to a field superconducting rotating machine including a superconducting coil.

  In paragraphs [0002] to [0004], [0007] to [0009] of Patent Document 1 below, and FIGS. 1 and 2, an iron solid core is used as the magnetic pole assembly 20 (rotor core) of the field superconducting rotating machine. The technology used is described.

  Patent Document 2 paragraphs [0026] to [0029] and FIGS. 2 to 6 disclose a technique for integrating a vacuum container that houses a superconducting coil.

  Patent Document 3 paragraphs [0020] to [0024] and FIGS. 2 and 3 disclose a technique in which the entire rotor of the field superconducting rotating machine is surrounded by a vacuum vessel.

JP-A-9-308222 JP 2011-138906 A Japanese Patent Laid-Open No. 2004-266988 JP 2005-304215 A

  When an iron solid core is used for the rotor core as in Patent Document 1, the iron loss increases due to the strong magnetic field generated from the superconducting coil. It is also possible to use laminated steel sheets (electromagnetic steel sheets) to reduce iron loss. However, in order to install a superconducting coil in a vacuum vessel on the rotor core, it is necessary to divide the rotor core for assembly reasons. The number of parts such as bolts for fixing the bolt increases.

  In addition, when the vacuum container for housing the superconducting coil is integrated as in the above-mentioned Patent Document 2, the vacuum container becomes large, making it difficult to manufacture, and when there is a problem such as vacuum leakage or heat insulation of the superconducting coil, the integrated container The whole must be exchanged. Furthermore, the core salient pole width (core width) in the rotor core cannot be increased, and magnetic saturation is likely to occur.

  And if the whole rotor is enclosed with a vacuum vessel like the said patent document 3, a vacuum vessel will become large. Further, since the thickness of the vacuum layer and the vacuum vessel wall is inserted between the rotor and the stator, the gap is increased and the performance is deteriorated.

  In addition, although the patent document 4 does not describe the rotor core, for example, in the case of an air core, a large amount of wire is required (see paragraph [0001] of the above patent document 1), or in the case of an iron core, the magnetic saturation of the core. If this is not taken into consideration, performance improvement in a strong magnetic field due to superconductivity will be limited.

  That is, in the conventional technique, the shape of the vacuum vessel for insulating the superconducting coil requires the division of the rotor core, and the size of the rotor core is restricted by the vacuum vessel, and the performance improvement is limited by magnetic saturation. There was a problem.

  The present invention has been made in view of the above technical problem, and an object of the present invention is to provide a field superconducting rotating machine that can improve performance by making it unnecessary to divide the rotor core and expanding the core width. And

The field superconducting rotating machine according to the first invention for solving the above-mentioned problems is
A spider that grips the shaft;
The same number of poles are arranged radially on the outer peripheral surface of the spider, and the rotor core protrudes outward in the rotor radial direction,
On the outer peripheral surface of the spider, a half of the number of poles is arranged so as to surround the side surface with respect to every other rotor core in the circumferential direction of the rotor, and each width is larger than the maximum width of each rotor core. A vacuum vessel having an inner peripheral surface of
Each includes a superconducting coil having half the number of poles stored in the vacuum vessel along the inner peripheral surface.

The field superconducting rotating machine according to the second invention for solving the above-mentioned problems is
In the field superconducting rotating machine according to the first invention,
Each of the superconducting coils has a number of turns twice the number of turns required when the same number of poles are arranged.

A field superconducting rotating machine according to a third invention for solving the above-mentioned problems is
In the field superconducting rotating machine according to the first or second invention,
Each of the rotor cores is composed of laminated steel plates.

  According to the field superconducting rotating machine according to the present invention, it is possible to improve the performance by making it unnecessary to divide the rotor core and expanding the core width.

It is the schematic of the rotor of the field superconducting rotating machine which concerns on a present Example, (a) is a perspective view, (b) is a top view, (c) represents a front cross-sectional arrow view. It is sectional drawing of the vacuum vessel which shows arrangement | positioning of a superconducting coil and a current lead wire. It is a perspective view of a superconducting coil, a coil electrode terminal, and a current lead wire. FIG. 3 is a cross-sectional view taken along the line BB in FIG. It is a cross-sectional arrow figure which shows the state which connected the superconducting coil and the vacuum vessel inner wall by the superconducting coil support structure. (A) is a cross-sectional arrow view equivalent to FIG. 4, (b) is a cross-sectional arrow view orthogonal to (a). It is the schematic explaining the superconducting coil support structure with respect to a superconducting coil. (A) is a perspective view of a state in which the support is placed in contact with the superconducting coil, and (b) is a bottom view in a state in which the support is placed in contact with the superconducting coil. ) Is a perspective view showing only one side of the support. It is a cross-sectional arrow view which shows the state which connected the superconducting coil and the vacuum vessel inner wall by the superconducting coil support structure of the other structural example. (A) is a figure equivalent to the cross-sectional arrow view of Fig.5 (a), (b) is a figure corresponded to the cross-sectional arrow view of FIG.5 (b). It is the schematic explaining the superconducting coil support structure of another structural example. (A) is a perspective view of the state in which the support is connected to the superconducting coil, (b) is a bottom view of the state in which the support is connected to the superconducting coil, and (c) is It is the perspective view which showed only the support body. FIG. 2 is a cross-sectional view taken along the line AA in FIG. It is the exploded view before attaching a vacuum vessel corresponding to the section arrow line view of FIG. It is the schematic of the rotor of the field superconducting rotating machine of a reference example, (a) is a perspective view, (b) is a top view, (c) is a front sectional arrow view. It is CC sectional view taken on the line of FIG.11 (b). It is an exploded view corresponding to the cross-sectional arrow view of FIG.

  Hereinafter, the field superconducting rotating machine according to the present invention will be described with reference to the drawings in the embodiments.

[Reference example]
FIG. 11 is a schematic view of a rotor of the field superconducting rotating machine of this reference example, FIG. 11 (a) is a perspective view, FIG. 11 (b) is a top view, and FIG. 11 (c) is a front sectional view. It is. As shown in FIGS. 11 (a), 11 (b), and 11 (c), the rotor 100 of the field superconducting rotating machine of this reference example is arranged radially on the shaft 101, the spider 102 that holds the shaft 101, and the outer peripheral surface of the spider 102. The rotor cores 103 and the superconducting coils (not shown in FIG. 11) that are arranged for each of the rotor cores 103 and that extend in the axial direction of the rotor are provided. Superconducting coils are used, and the number of rotor cores 103 and vacuum vessels 104 is the same as the number of poles of the rotor 100.

  FIG. 12 is a cross-sectional view taken along the line CC in FIG. As shown in FIG. 12, the rotor cores 103 arranged radially on the outer peripheral surface of the spider 102 each have a rotor core base side salient pole part 103a and a rotor core tip side salient pole part 103b.

  The rotor core base side salient pole portion 103a is fixed to the outer peripheral surface of the spider 102 by a plurality of bolts 106, protrudes outward in the rotor radial direction, and has a rectangular shape in cross section in the rotor radial direction. The rotor core tip side salient pole portion 103b is fixed to the rotor core base side salient pole portion 103a by a plurality of bolts 107 from the outer side in the rotor radial direction, and has a hook shape in a sectional view in the rotor radial direction.

  The rotor core tip side salient pole part 103b is wider than the rotor core base side salient pole part 103a in the rotor tangential direction in the rotor radial direction sectional view (in the rotor core 103 arranged at the center of FIG. Is getting longer. The width of the rotor core root salient pole portion 103a in the rotor tangent direction is referred to as “core width”.

  The vacuum vessel 104 is a heat insulating vessel having an annular (race track shape) inner peripheral surface 104a extending in the rotor axial direction and surrounding the rotor core root salient pole portion 103a, and the superconducting coil 105 is stored therein. Yes. Furthermore, the racetrack-shaped superconducting coil 105 extending in the rotor axial direction is housed in the vacuum vessel 104 and functions as a field winding in the rotor 100.

  13 is an exploded view corresponding to the cross-sectional view of FIG. As shown in FIG. 13, in order to assemble the field superconducting rotating machine of this reference example configured as described above, a vacuum vessel 104 containing a superconducting coil 105 is disposed around the rotor core base side salient pole portion 103a, and a vacuum is provided. After the bottom surface 104a of the container 104 (the inner surface in the rotor radial direction) 104a is fixed to the spider 102 with the bolt 106, the rotor core tip side salient pole portion 103b is fixed to the rotor core root side salient pole portion 103a from the rotor radial direction outer side with the bolt 107. There is a need to.

  That is, the field superconducting rotating machine of the present reference example is different from the copper winding rotating machine in that a vacuum vessel containing the superconducting coil is arranged, so that it is necessary to devise assembly. In particular, operations such as dividing the rotor core as described above must be performed. In that case, it becomes difficult to use a laminated steel plate (electromagnetic steel plate) for the rotor core, resulting in an increase in iron loss.

[Example]
The structure of the field superconducting rotating machine according to the present embodiment is shown in FIGS. FIG. 1 is a schematic view of a rotor of a field superconducting rotating machine according to the present embodiment, FIG. 1 (a) is a perspective view, FIG. 1 (b) is a top view, and FIG. 1 (c) is a front sectional view. Represents the figure.

  The rotor 10 of the field superconducting rotating machine according to the present embodiment includes a shaft 11, a spider 12 that holds the shaft 11, a rotor core 13 that is radially disposed on the outer peripheral surface of the spider 12, and a superconducting coil that extends in the rotor axial direction. The vacuum vessel 14 is stored, which is omitted in FIG. The shaft 11, the spider 12, and the rotor core 13 are made of iron, and the vacuum vessel 14 is made of stainless steel. Moreover, the rotor core 13 shall be comprised with a laminated steel plate.

  In the field superconducting rotating machine according to the present embodiment, half the superconducting coils are arranged with respect to the number of poles of the rotor 10. In FIG. 1, since the number of poles is 30, 15 superconducting coils are used. However, the present embodiment is not limited to this.

  Here, power supply to the superconducting coil in the field superconducting rotating machine according to the present embodiment will be described first. Power supply to the superconducting coil in the field superconducting rotating machine according to the present embodiment is performed through a current introduction terminal penetrating the vacuum vessel wall.

  FIG. 2 is a cross-sectional view of a vacuum vessel showing the arrangement of superconducting coils and current leads. FIG. 3 is a perspective view of a superconducting coil, coil electrode terminals, and current lead wires. 4 is a cross-sectional view taken along the line BB in FIG. 2 (a view showing the position of the coil electrode terminal) (however, a support structure for a superconducting coil to be described later is not shown).

  The superconducting coil 15 will be described again. The superconducting coil 15 has a racetrack shape extending in the rotor axial direction of the rotor 10 and is stored in the vacuum container 14 (the longitudinal direction thereof coincides with the longitudinal direction of the vacuum container 14). Has been.

  The field superconducting rotating machine according to this embodiment includes coil electrode terminals 21a and 21b arranged in the vacuum vessel 14, one end surface in the longitudinal direction (of the superconducting coil 15) (one end surface in the rotor axial direction) 14- 1, current introduction terminals 22a and 22b (see FIG. 2) exposed to the outside from both ends of the end face, a current lead wire 23a for electrically connecting the coil electrode terminal 21a and the current introduction terminal 22a, and a coil electrode terminal Current lead wire 23b is provided for electrically connecting 21b and current introduction terminal 22b. Incidentally, the coil electrode terminals 21a and 21b and the current lead wires 23a and 23b are made of copper.

  On one end surface in the longitudinal direction of the vacuum vessel 14 (end surface on one end side in the longitudinal direction of the superconducting coil 15) 14-1, current introduction terminals 22a and 22b exposed from both ends of the end surface are external power supplies or other vacuum vessels. To be connected to the terminal.

  The coil electrode terminals 21 a and 21 b are disposed inside the other longitudinal end surface 14-2 of the vacuum vessel 14 and are connected to the superconducting coil 15. That is, the coil electrode terminals 21 a and 21 b are connected to the other end in the longitudinal direction of the superconducting coil 15.

  That is, the coil electrode terminals 21a and 21b and the current introduction terminals 22a and 22b are respectively arranged at both ends in the longitudinal direction of the superconducting coil 15, and the coil electrode terminal 21a and the current introduction terminal 22a are mutually in a vacuum container. 14, the coil electrode terminal 21 b and the current introduction terminal 22 b are arranged at diagonal positions of the vacuum vessel 14.

  One end of the current lead wire 23a is connected to the current introduction terminal 22a in the vacuum vessel 14, and extends along the superconducting coil 15 while being separated from the superconducting coil 15 in the circumferential direction, and the other end is connected to the current conducting wire 23a. The coil electrode terminal 21a is arranged in a diagonal position with respect to the current introduction terminal 22a.

  One end of the current lead wire 23 b is connected to the current introduction terminal 22 b inside the vacuum vessel 14, and extends from the superconducting coil 15 along the superconducting coil 15 while being separated from the superconducting coil 15 in the circumferential direction. The coil electrode terminal 21b is disposed in a diagonal position with respect to the current introduction terminal 22b.

  As shown in FIG. 4, since the current lead wire 23a and the current lead wire 23b are arranged at different positions in the vertical direction (rotor radial direction), they are in contact with each other in the vicinity of the coil electrode terminals 21a and 21b. There is nothing.

  Thus, in the field superconducting rotating machine according to the present embodiment, each vacuum vessel is electrically connected by the current introduction terminal, so that a power source (not shown) and a plurality of superconducting coils are electrically connected in series. It is said.

  The superconducting coil 15 cooled to a very low temperature by a cooling system (not shown) is isolated from the wall surface of the vacuum vessel 14 at room temperature by a vacuum, and maintains a low temperature state.

  In the field superconducting rotating machine according to the present embodiment, as described above, in the vacuum vessel 14, the coil electrode terminals 21a and 21b are arranged on the opposite sides (in the rotor axial direction) of the current introduction terminals 22a and 22b, respectively. Thus, by arranging the current lead wires 23a and 23b between the coil electrode terminals 21a and 21b and the current introduction terminals 22a and 22b, the current lead wires 23a and 23b are formed inside the vacuum vessel 14 without increasing the size of the vacuum vessel 14. The length of 23b can be ensured and the conduction heat to the superconducting coil 15 can be suppressed.

  Further, adjacent vacuum containers 14 are connected to each other by a vacuum pipe in which current lead wires electrically connecting in series the superconducting coils 15 respectively stored in the adjacent vacuum containers 14 are connected to each other. It is good also as a unit.

  By the way, the superconducting coil in the field superconducting rotating machine according to the present embodiment is fixed to the inner wall of the container by a support structure (hereinafter referred to as a superconducting coil support structure). A method for supporting the superconducting coil in the field superconducting rotating machine according to the present embodiment will be described with reference to FIGS.

  FIG. 5 is a cross-sectional view showing a state in which the superconducting coil and the inner wall of the vacuum vessel are connected by the superconducting coil support structure (current leads and electrodes are not shown). 5A is a cross-sectional arrow view corresponding to FIG. 4, and FIG. 5B is a cross-sectional arrow view orthogonal to FIG. 5A.

  FIG. 6 is a schematic diagram for explaining a superconducting coil support structure for the superconducting coil. FIG. 6A is a perspective view of a state in which the support is disposed in contact with the superconducting coil, and FIG. 6B is a bottom view of the state in which the support is disposed in contact with the superconducting coil. FIG. 6C is a perspective view showing only one side of the support.

  First, the superconducting coil support structure includes a support 31a and auxiliary supports 32a-1 to 32a-4.

  As shown in FIGS. 5A and 5B, the support 31a connects the superconducting coil 15 and the inner wall of the vacuum vessel 14 in order to position (support) the superconducting coil 15 in the internal space of the vacuum vessel 14. is there. The support 31a is made of stainless steel and has a small cross-sectional area and a long length, thereby providing a thermal barrier between the cryogenic superconducting coil 15 and the normal temperature rotor (outside the vacuum vessel 14). ing.

  Further, as shown in FIGS. 5A and 5B, the support 31a is disposed on the inner wall of the vacuum vessel 14, and the lower part (inner side in the rotor radial direction) or upper part (outer side in the rotor radial direction) of the superconducting coil 15 is provided. 6A and 6B, the superconducting coil 15 is supported so as to correspond to the shape of the superconducting coil 15 in the winding direction. 5A, 5B, and 6A, 6B show a state in which the support 31a is disposed below the superconducting coil 15 (in the rotor radial direction).

  Further, the support 31a has a shape constituted by a plurality of flat plates (two long flat plates and two short flat plates in FIG. 6) whose both ends in the longitudinal direction are connected to each other.

  As described above, by disposing the support 31a on the circumference of the superconducting coil 15, the length of the support 31a can be increased even in a narrow space, and a thermal barrier can be obtained.

  Each flat plate of the support 31a supports the superconducting coil 15 (more precisely, a copper plate 34a-2 described later) at the center in the longitudinal direction, and both ends in the longitudinal direction (that is, corners of the support 31a) are on the inner wall of the vacuum vessel 14 As shown in FIGS. 6A and 6C, the shape is refracted.

  As described above, the support 31 a can be made longer in the internal space of the vacuum vessel 14 by the flat plates being inclined (refracted) between the superconducting coil 15 and the inner wall of the vacuum vessel 14. it can. In addition, since the support body 31a is a plate made of stainless steel, deterioration and breakage due to bolt fastening are suppressed, and strong against centrifugal force such as rotation.

  The auxiliary supports 32a-1 to 32a-4 support the superconducting coil 15 by fixing the support 31a so that the contact portion between the support 31a and the superconducting coil 15 is positioned away from the inner wall of the vacuum vessel 14. Is.

  In other words, the auxiliary supports 32a-1 to 32a-4 are arranged so as to extend from the vacuum vessel 14 toward the back side of the central portion in the longitudinal direction of the support 31a. The auxiliary supports 32a-1 to 32a-4 preferably have a spring structure.

  Further, the superconducting coil support structure includes iron plates 33a-1 and 33a-2 and copper plates 34a-1 and 34a-2.

  The superconducting coil 15 is sandwiched between iron plates 33a-1 and 33a-2 from both sides of the lower portion (inner side in the rotor radial direction) and the upper portion (outer side in the rotor radial direction), and a copper plate from the outer side of the iron plates 33a-1 and 33a-2. It is sandwiched between 34a-1 and 34a-2. The iron plates 33 a-1, 33 a-2 and the copper plates 34 a-1, 34 a-2 are racetrack-shaped flat plates along the winding direction with respect to the superconducting coil 15.

  Then, these copper plates 34a-1 and 34a-2 are brought into contact with a flat knitted lead wire having excellent flexibility even at extremely low temperatures as a heat conductor from the refrigerator (not shown), or the vacuum vessel 14 A structure such as flowing a refrigerant such as liquid nitrogen (not shown) is used (cooling system). Thereby, the superconducting coil 15 can be kept at a very low temperature.

  The iron plates 33a-1, 33a-2 and the copper plates 34a-1, 34a-2 are each provided with a plurality of bolt through holes 25a-1.

  A bolt (not shown in FIGS. 1 to 4) is provided in a part of the plurality of bolt through holes 25a-1 disposed in the iron plates 33a-1 and 33a-2 and the copper plates 34a-1 and 34a-2. By passing, the superconducting coil 15, the iron plates 33a-1, 33a-2, and the copper plates 34a-1, 34a-2 are fixed. Note that, when the “part” is, for example, the bolt through hole 25 a-1 disposed at each contact portion with the auxiliary support 22, stability can be ensured.

  By making the superconducting coil support structure the above structure, first, the superconducting coil 15 is cooled to a very low temperature by the above-described cooling system (not shown), and a superconducting state can be obtained. A large torque can be generated by using a large magnetic field generated by a large current.

  At this time, with respect to the heat that enters the superconducting coil 15 in the cryogenic state from the outside of the room temperature vacuum vessel 14, the vacuum vessel 14 provides a vacuum gap to eliminate convection heat, and the support 31a is provided to provide the vacuum vessel. The contact area with 14 inner walls becomes small, and the conduction heat is restrained small.

  Further, the contact portion between the support 31a and the superconducting coil 15 moves in the vertical direction (rotor radial direction) due to the thermal contraction of the superconducting coil 15, that is, the distance from the inner wall of the vacuum vessel 14 changes. By making the bodies 32a-1 to 32a-4 extendable spring structures, it is possible to cope with this change.

  Moreover, a thermal barrier can be ensured by making the auxiliary support bodies 32a-1 to 32a-4 have a spring structure. That is, the spring structure has a small contact area with respect to the superconducting coil 15 and the inner wall of the vacuum vessel 14, and in addition, since it is wound, the distance is long, so that intrusion heat does not increase.

  Usually, when a current is passed, the superconducting coil receives a force in a direction perpendicular to the current and moves the magnetic flux, thereby causing an electrical resistance and reducing the current that can be passed. However, in the superconducting coil support structure, the iron plates 33a-1 and 33a-2 are arranged between the copper plates 34a-1 and 34a-2 and the superconducting coil 15, so that the vertical component of the magnetic field can be reduced and flowed. The decrease in current is suppressed.

  Here, another configuration example of the superconducting coil support structure will be described with reference to FIGS. FIG. 7 is a cross-sectional arrow view showing a state where the superconducting coil and the inner wall of the vacuum vessel are connected by the superconducting coil support structure of another configuration example. FIG. 7A is a view corresponding to the cross-sectional arrow view of FIG. 5A, and FIG. 7B is a view corresponding to the cross-sectional view of FIG. 5B.

  FIG. 8 is a schematic diagram illustrating a superconducting coil support structure of another configuration example. FIG. 8A is a perspective view of a state in which the support body is connected to the superconducting coil, and FIG. 8B is a bottom view of the state in which the support body is connected to the superconducting coil. FIG. 8C is a perspective view showing only the support.

  One surface of the support 41 a is in contact with the inner wall of the vacuum vessel 14, and is a racetrack-shaped flat plate along the winding direction with respect to the superconducting coil 15. The support body 41a is provided with a plurality of bolt through holes 25a-2 through which the bolts 37a-1 to 37a-4 are passed.

  The spacers 39a-1 to 39a-8 are provided between the inner wall on the outer side in the rotor radial direction of the vacuum vessel 14 and a part of the plurality of bolt through holes 25a-1 on the copper plate 34a-1 on the outer side in the rotor radial direction. The bolts 37a-1 to 37a-4 are made of cylindrical stainless steel. In addition, about this "part", what is necessary is just the bolt through-hole 25a-1 of arrangement | positioning which can ensure stability when passing the volt | bolts 37a-1 to 37a-4 (the same is true below).

  The spacers 39a-9 to 39a-16 are provided between the bolt through holes 25a-2 of the support body 41a and a part of the plurality of bolt through holes 25a-1 of the copper plate 34a-2 on the rotor radial direction inner side. The bolts 37a-1 to 37a-4 are made of cylindrical stainless steel.

  Spacers 39a-1 to 39a-8 create a space between the inner wall of the vacuum vessel 14 on the outer side in the rotor radial direction and the copper plate 34a-2 on the inner side in the rotor radial direction, and are supported by the spacers 39a-9 to 39a-16. A space is formed between the body 41a and the copper plate 34a-2 on the inner side in the rotor radial direction. As a result, the superconducting coil 15 can be kept at a position spaced apart from the inner wall of the vacuum vessel 14 in the rotor radial direction and the inner wall of the vacuum vessel 14.

  In addition, a groove or a recess is provided at a position corresponding to the bolt through hole 25a-2 of the support body 41a on the inner wall of the vacuum vessel 14 in the radial direction of the rotor.

  Further, the cap nuts 38a-1 to 38a-8 have hemispherical ends, and are arranged on the inner wall side of the vacuum vessel 14 of the bolt through holes 25a-2 of the support 41a. Further, the cap nuts 38a-1 to 38a-8 are embedded in the groove or the recess. By doing in this way, alignment becomes easy.

  Since the cap nuts 38a-1 to 38a-4 are hemispherical, the contact portions between the vacuum vessel 14 and the cap nuts 38a-1 to 38a-4 are point contacts, and the copper plate 34a-2 and the support body 41a is kept away from the distance by the spacers 39a-9 to 39a-16, so that the heat entering the superconducting coil 15 can be suppressed.

  That is, in the superconducting coil support structure of another configuration example, the superconducting coil 15 (and the iron plates 33a-1, 33a-2 and the copper plates 34a-1, 34a-2) are separated by the spacers 39a-1 to 39a-16. The bolts 37a-1 to 37a-8 are fastened by bolts 37a-1 to 37a-8, which are fixed at positions separated from the inner wall of the vacuum vessel 14 and the support body 41a and arranged concentrically with the spacers 39a-1 to 39a-16. . The support body 41a is fixed to the inner wall of the vacuum vessel 14 by bolts 37a-1 to 37a-8. The upper ends (heads) of the bolts 37a-1 to 37a-8 are separated from the vacuum vessel 14 and are not in contact with each other.

  The superconducting coil support structure of the field superconducting rotating machine according to the present embodiment can prevent heat from entering the superconducting coil 15 from the outside of the vacuum vessel 14 by adopting the above-described configuration.

  In the above description, the support 41a is disposed on the inner wall of the vacuum vessel 14 on the inner side in the rotor radial direction. However, the present embodiment is not limited to this, and for example, the rotor of the vacuum vessel 14 It is good also as what is arrange | positioned at the inner wall of a radial direction outer side. In that case, the bolts 37a-1 to 37a-4, the cap nuts 38a-1 to 38a-4, the grooves (recesses), and the like are also arranged in the reverse manner.

  9 is a cross-sectional view taken along the line AA in FIG. 1B, and FIG. 10 is an exploded view corresponding to the cross-sectional view taken in FIG. The superconducting coil 15 according to the present embodiment has an arrangement number of half the number of poles, and the number of turns per unit is twice the number of turns required when the same number of poles are arranged. The performance is maintained.

  In addition, by doubling the number of turns, the cross-sectional area of the superconducting coil 15 is also twice that of the superconducting coil 105 of the reference example (see FIGS. 12 and 13). The amount of wire used for the coil is the same as the reference example.

  Further, the rotor core 13 is composed of laminated steel plates, and the same number of poles are arranged radially on the outer peripheral surface of the spider 12, each projecting outward in the rotor radial direction, and the rotor radial sectional view is rectangular It is.

  More specifically, the shape corresponding to the rotor core base side salient pole portion 103a and the rotor core tip side salient pole portion 103b in the rotor 100 of the reference example is a shape formed as an integral object. However, the width of the portion corresponding to the core width of the rotor core base salient pole portion 103a is expanded (however, the length is equal to or less than the length corresponding to the width in the same direction of the rotor core tip side salient pole portion 103b).

  In addition, a rotor support portion 13a having a divergent trapezoidal shape protruding inward in the rotor axial direction in a rotor radial direction sectional view is formed on the inner surface of the rotor core 13 in the rotor axial direction.

  On the outer peripheral surface of the spider 12, a groove 12a corresponding to the shape of the core support portion 13a is formed. The rotor support portion 13a is fixed by being fitted into the groove 12a, and may be fixed with an adhesive or the like.

  As shown in FIGS. 1A, 1 </ b> B, and 1 </ b> C and FIGS. 9 and 10, the vacuum vessel 14, which is a heat insulating vessel, has half the number of poles radially on the outer peripheral surface of the spider 12. Of these, every other rotor core 13 in the circumferential direction of the rotor is disposed so as to surround its side surface.

  The vacuum vessel 14 has a shape that does not interfere with the rotor core 13 and is fixed to the spider 12 with bolts 16 or the like from the outside in the rotor radial direction.

  The “shape that does not interfere with the rotor core 13” will be specifically described. The vacuum vessel 13 has an annular (race track shape) inner peripheral surface 14a extending in the rotor axial direction, and the inner peripheral surface 14a. As shown in FIGS. 9 and 10, the core width direction (rotor tangential direction) is larger than the shape corresponding to the rotor core tip side salient pole portion 103 b (see FIGS. 12 and 13) of the rotor core 13 in the rotor radial direction sectional view. It means that the width of is large. In other words, the vacuum vessel 14 a has the inner peripheral surface 14 a having a width larger than the maximum width of the rotor 13 in the rotor tangent direction.

  The superconducting coils 15 in which half the number of poles are arranged have racetrack shapes that extend in the rotor axial direction, are stored in the vacuum vessel 14 along the inner peripheral surface 14 a, and are wound in the field within the rotor 10. Acts as a line.

  Since the rotor core 13 has a shape that does not interfere with the vacuum container 14 as described above, the rotor core 13 is not divided and the vacuum container 14 is fixed to the spider 12 as in the technique of the reference example (FIGS. 11 to 13). be able to.

  The above is the configuration of the field superconducting rotating machine according to the present embodiment. In the above description, it has been described that the superconducting coil 15 is cooled to an extremely low temperature by heat conduction. However, a method of circulating the refrigerant such as liquid nitrogen through the vacuum vessel 14 to cool the superconducting coil 15 may be used.

  In the field superconducting rotating machine according to the present embodiment, the superconducting coil 15 cooled to a cryogenic temperature by the cooling system is isolated from the wall surface of the vacuum vessel 14 at room temperature by a vacuum and kept at a cryogenic temperature. By flowing a large current through the superconducting coil 15 cooled to a very low temperature, a strong magnetic field can be generated and a large torque can be obtained.

  According to the field superconducting rotating machine according to this embodiment, the number of superconducting coils 15 is half that of the field superconducting rotating machine of the reference example (half the number of poles), and the number of turns is doubled. The cross-sectional area of the rotary machine is the same as that of the field superconducting rotary machine of the reference example as a whole, but the number of vacuum vessels 14 is halved (since the superconducting wire has a small cross-sectional area, one superconducting coil 15 is not so large), the space that can be used on the outer peripheral surface of the spider 12 is increased, and the core width of the rotor core 14 can be increased.

  Thereby, in the field superconducting rotating machine according to the present embodiment, even when a large current is passed through the superconducting coil 15, the rotor core 13 can be prevented from being saturated with the magnetic flux, and the increased magnetic flux can be used effectively, Performance can be improved.

  Further, in the field superconducting rotating machine according to the present embodiment, the vacuum vessel 14 can be assembled from the outside in the radial direction of the rotor without interfering with the rotor core 13 in comparison with the rotor core 13 incorporated in the spider 12. . Therefore, division of the rotor core 13 becomes unnecessary. Furthermore, in the field superconducting rotating machine according to the present embodiment, the number of vacuum vessels 14 is half the number of poles. Therefore, the field superconducting rotator according to the present embodiment can reduce the number of parts compared to the field superconducting rotator of the reference example.

  In the prior arts such as Patent Document 1 described above, the rotor core is divided and bolts must be used to form the rotor core. However, it is difficult to provide bolt holes in the laminated steel sheet, so the rotor core is made of iron. A solid core must be used. As a result, the saturation magnetic flux density is reached at about 2T. In this state, even if the current value is increased, the leakage magnetic flux only increases, the performance improvement effect is limited, and the iron loss increases.

  In the field superconducting rotating machine according to the present embodiment, by increasing the core width of the rotor core, the magnetic flux saturation can be relaxed and the performance can be improved, and furthermore, the laminated steel can be used for the rotor core. The loss can be reduced.

  The present invention is suitable as a field superconducting rotating machine.

10, 100 Rotor 11, 101 Shaft 12, 102 Spider 13, 103 Rotor core 14, 104 Vacuum container 14-1 Longitudinal one end face 14-2 (Vacuum container) Longitudinal other end face 15, 105 Superconducting coil 16, 106, 107 Bolts 21a, 21b Coil electrode terminals 22a, 22b Current introduction terminals 23a, 23b Current lead wires 31a, 41a Support bodies 32a-1 to 32a-4 Auxiliary support bodies 33a-1, 33a-2 Iron plate 34a-1 , 34a-2 Copper plate 35a-1 (iron plates 33a-1, 33a-2 and copper plates 34a-1, 34a-2) bolt through hole 35a-2 (supports 31a, 41a) bolt through hole 37a-1 ~ 37a-4 Bolts 38a-1 to 38a-4 Cap nut 39a-1 to 39a-16 Spacer

Claims (3)

A spider that grips the shaft;
The same number of poles are arranged radially on the outer peripheral surface of the spider, and the rotor core protrudes outward in the rotor radial direction,
On the outer peripheral surface of the spider, a half of the number of poles is arranged so as to surround the side surface with respect to every other rotor core in the circumferential direction of the rotor, and each width is larger than the maximum width of each rotor core. A vacuum vessel having an inner peripheral surface of
A field superconducting rotating machine comprising: a superconducting coil having half the number of poles, each housed in the vacuum vessel along the inner peripheral surface. 2. The field superconducting rotating machine according to claim 1, wherein each of the superconducting coils has a number of turns that is twice the number of turns required when the same number of poles are arranged. Each said rotor core is comprised with the laminated steel plate. The field superconducting rotary machine of Claim 1 or 2 characterized by the above-mentioned.

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