JP6101550B2 - Superconducting rotating machine - Google Patents

Description

The present invention relates to a superconducting rotating machine.

  A superconducting rotating machine using a superconducting material for a stator or a rotor utilizes the fact that the electric resistance of the superconducting material is zero or extremely small. For this reason, it is possible to reduce the size, increase the efficiency, and increase the torque with respect to the conventional rotating machine using a copper wire. In order to realize these features, it is necessary to cool the superconducting material to be used below its superconducting critical temperature Tc and maintain the superconducting state stably. If the cooling is inadequate and the temperature exceeds Tc during operation, not only the performance of the rotating machine will deteriorate, but in some cases, the superconducting material will be damaged and the rotating machine will fail.

  Patent Document 1 discloses a superconducting induction synchronous rotating machine that functions as a highly efficient synchronous rotating machine with a simple structure of an induction rotating machine by applying a superconducting material to a cage conductor incorporated in a rotor of the induction rotating machine. It is disclosed. At constant rotation, direct current flows through the superconducting lead-shaped conductor and no heat is generated. However, since the current changes and heat is generated when the rotational speed changes, it is necessary to cool the superconducting material so that it does not exceed Tc even at the highest temperature. Further, when a superconducting coil is used for the stator, an alternating current always flows, so cooling that exceeds the heat generation amount is required. However, Patent Document 1 does not disclose these cooling methods.

  Patent Document 2 discloses a superconducting rotator that cools a superconducting rotor via a gaseous refrigerant in a housing chamber by cooling a stator with respect to a superconducting rotator using a superconducting material as a rotor. Fan-shaped blade portions are provided at both ends of the rotor, and when the blade portions rotate together with the rotor, the gaseous refrigerant moves from the end surfaces of both shafts of the stator to the central portion in the axial length direction, and the rotor is radially inward from the opening of the slot groove. The superconducting material of the rotor is cooled by circulating a gaseous refrigerant so that the rotor contacts the rotor. However, since the refrigerant is directed from the both axial end faces of the stator toward the central portion in the axial length direction and there is a cylindrical gap between the rotor and the stator, the gas refrigerant does not necessarily flow as described above. In the case where a superconducting coil is used for the stator, there is a problem that the superconducting coil in the stator cannot be sufficiently cooled. In particular, when the refrigerant is a liquid, there is a problem that bubbles generated by vaporization due to heat generated by the superconducting coil or the material stay in the stator or in the gap between the rotor and the stator, and cooling becomes insufficient.

International Publication No. 2009-116219 JP 2011-670006 A

An object of the present invention is to provide a highly efficient and high performance superconducting rotating machine by stably cooling a rotor or a stator using a superconducting material.

(1) The superconducting rotating machine of the present invention is a superconducting rotating machine constituting a motor or a generator,
A superconducting stator comprising a cylindrical stator core having a slot extending between both end faces, and a superconducting coil housed in the slot and formed by winding a superconducting wire;
A rotor provided rotatably with respect to the superconducting stator, and having a central axis of the superconducting stator and a rotation axis arranged coaxially;
The superconducting stator and the rotor are both arranged in a common refrigerant,
Between the peripheral surface forming the slot and the superconducting coil, there is a stator side gap communicating with both axial end surfaces of the stator core,
The rotor is to have a through hole and / or groove extending in a direction inclined with respect to and the rotation axis communicates both end faces in the axial direction of said rotor,
The through hole or / and groove of the rotor is formed with an inclination in one circumferential direction with respect to the rotation axis of the rotor,
In the opening peripheral edge portion of the through hole or / and groove at the end surface in the axial direction of the rotor, the circumferential direction in which the angle between the extending direction of the through hole or / and groove and the end surface in the axial direction of the rotor is large Having one side portion and the other side portion in the circumferential direction in which the angle of the rotor outer side between the extending direction of the through hole or / and the groove and the end surface in the axial direction of the rotor is smaller than the one side portion;
The one side portion of the peripheral edge of the opening is relatively higher in the rotation axis direction than the other side portion .

  In the above configuration, the rotor and the superconducting stator are in a common refrigerant. The superconducting stator has a slot for accommodating the superconducting coil, and a stator-side gap is formed between the peripheral surface forming the slot and the superconducting coil so as to communicate both end surfaces in the axial direction of the stator. For this reason, a refrigerant | coolant can flow through a stator side clearance gap and can cool a superconducting coil.

  The rotor has a plurality of through holes or / and grooves that communicate with both axial end surfaces and extend in a direction inclined with respect to the rotation axis. For this reason, when the rotor rotates, the refrigerant flows in one direction from one end face of the rotor to the other end face through the through hole or / and the groove.

  When the rotating machine starts operation and the rotor rotates, the rotation of the rotor causes a refrigerant flow in one direction with respect to the rotation axis. As a result, in the superconducting stator, the refrigerant flows in a direction opposite to that in the rotor through the stator-side gap between the peripheral surface forming the slot and the superconducting coil. As a result, a refrigerant flow that circulates in one direction with respect to the rotating shaft is generated, and the superconducting stator and the rotor can be cooled.

  The through holes or / and grooves through which the refrigerant flows communicate with both end faces in the axial direction of the rotor. In the superconducting stator, there is a stator-side gap through which the refrigerant flows between the peripheral surface forming the slot and the superconducting coil between both axial end surfaces. For this reason, the refrigerant circulates over the entire axial direction of the rotor and the superconducting stator. Therefore, the superconducting coil can be cooled with high efficiency.

  Thus, when the refrigerant is a liquid refrigerant, it is not necessarily a gas refrigerant, and a propulsive force can be obtained when passing through a through hole or / and a groove extending in a direction inclined with respect to the rotation axis of the rotor. it can. The refrigerant that has obtained a propulsive force by the rotor can flow stably in the direction opposite to that in the rotor through the stator-side gap formed in the slot of the superconducting stator. Therefore, the heat generated in the superconducting coil can be efficiently removed without staying in the slot, and the superconducting coil can be cooled to a stable temperature.

  In the case of a liquid refrigerant, since the refrigerant bubbles generated in the slot can be discharged to the outside of the slot, the superconducting coil can be cooled to a stable temperature. Since the refrigerant flows in one direction also in the rotor, it can be cooled to a stable temperature like the stator.

  Here, the through-hole or / and groove formed in the rotor is a fluid passage that communicates both end surfaces of the rotor in the axial direction. The through hole is formed inside the rotor and has openings only on both end faces in the axial direction. The groove is formed on the outer peripheral surface of the rotor and has not only end surface openings that open on both end surfaces of the rotor, but also side surface openings that open on the outer peripheral surface of the rotor. The through hole or / and the groove extend in a direction not parallel to the rotation axis of the rotor, that is, a direction inclined with respect to the rotation axis, and communicate with both end faces of the rotor.

  The rotor may have only through-holes, may have only grooves, or may have both through-holes and grooves. The rotor may have a plurality of through holes or / and grooves. The respective through holes or / and grooves may be parallel to each other or may not be parallel as long as they are inclined to the same side in the circumferential direction and / or radial direction with respect to the rotation axis.

  The direction in which the coolant flows in the through hole or / and groove in the rotor is determined by the arrangement (inclination) of the through hole or groove with respect to the rotation shaft and the rotation direction of the rotor.

  The through hole or / and the groove of the rotor are formed with an inclination in one direction of the circumferential direction of the rotor. When the rotor rotates, a viscous force works due to a difference in the speed of the refrigerant at the end face openings of the through holes and / or grooves at both end faces of the rotor, and the through holes or / and grooves by the component parallel to the through holes or / and grooves. The refrigerant flows in one direction. For this reason, a refrigerant | coolant flows into one direction of a rotating shaft direction according to the rotation direction of a rotor, and cools a rotor. Further, as described above, a flow in one direction in the opposite direction is generated in the stator to cool the superconducting coil.

  When the end surface of the rotor is viewed from the axial direction, if the through-hole or / and groove is formed with an inclination in the counterclockwise direction from the front end surface toward the opposite end surface, the rotor rotates clockwise. When rotating, the refrigerant flows from the front end surface toward the opposite end surface through the through hole or / and the groove (see FIG. 5). Conversely, when the rotor rotates counterclockwise, it flows from the opposite end surface toward the front end surface.

  The closer the through hole is to the outer peripheral surface of the rotor, the higher the flow rate of the refrigerant, which is preferable. When the rotor has both the through hole and the groove, it is preferable that the through hole and the groove are inclined in the same circumferential direction. Further, the greater the inclination with respect to the rotation axis, that is, the smaller the angle with the rotor end surface, the greater the flow rate of the refrigerant, and the more efficiently the rotor and stator can be cooled.

  When the through-hole or / and the groove is inclined in the circumferential direction of the rotor with respect to the rotation axis of the rotor, the extending direction of the through-hole or / and the groove in the peripheral edge of the through-hole or / and the groove and the rotor One side portion in the circumferential direction where the rotor outer angle with the end surface of the rotor is large, and the other side portion in the circumferential direction where the angle between the extending direction of the through-hole or / and the groove and the rotor end surface is smaller than the one side portion And have. By making the one side portion of the peripheral edge of the opening of the through hole or / and groove relatively higher in the rotation axis direction than the other side portion, the refrigerant can easily flow into the through hole or / and groove, and the flow rate is reduced. Can be increased.

  In the case where the above-described through hole or / and groove is formed with an inclination in the counterclockwise direction from the front end surface toward the opposite end surface, the peripheral edge of the through hole or / and groove in the front end surface In the section, the left side (counterclockwise side with respect to the through hole or / and the groove) of the end face on the front side protrudes toward the outer side of the rotor on the front side relative to the right side, and the opening periphery on the opposite side When viewed from the front side, the right side (clockwise side with respect to the through hole or / and the groove) of the portion protrudes relatively to the outer side of the rotor from the left side (see FIG. 5). For example, when the rotor is rotated in the clockwise direction, at the end surface of the rotor on the refrigerant inflow side, at the opening peripheral edge of the through hole or / and groove, the left side as viewed from the rotation axis side of the front end surface (through) You may provide the protrusion part which protrudes on the outer side of a rotor of the near side rather than an end surface in the counterclockwise side with respect to a hole or / and a groove | channel. The refrigerant flows counterclockwise in the circumferential direction on the front end surface, and is damped by the protrusions, and easily flows into the through hole or / and the groove.

  Alternatively, when the rotor is rotated in the clockwise direction, at the end face of the rotor on the refrigerant inflow side, at the opening peripheral edge of the through hole or / and the groove, the right side (through) A concave portion connected to the through hole or / and the groove may be provided on the inner side of the rotor beyond the end face on the clockwise side with respect to the hole or / and the groove. The refrigerant flows counterclockwise in the circumferential direction on the front end surface, and is guided to the concave portion and easily flows into the through hole and / or the groove.

  The protrusions or recesses formed on the end face of the rotor can be formed only on one end face in the axial direction of the rotor. It is preferable to provide a protrusion or a recess on the end surface on the coolant inflow side into the through hole or / and groove of the rotor.

(2) The superconducting rotating machine of the present invention is a superconducting rotating machine constituting a motor or a generator,
A superconducting stator comprising a cylindrical stator core having a slot extending between both end faces, and a superconducting coil housed in the slot and formed by winding a superconducting wire;
A rotor provided rotatably with respect to the superconducting stator, and having a central axis of the superconducting stator and a rotation axis arranged coaxially;
The superconducting stator and the rotor are both arranged in a common refrigerant,
Between the peripheral surface forming the slot and the superconducting coil, there is a stator side gap communicating with both axial end surfaces of the stator core,
The rotor has a through-hole or / and a groove that communicates with both axial end faces of the rotor and extends in a direction inclined with respect to the rotation axis;
The through hole of said rotor, characterized in that it is formed with an inclination in one direction radially relative to the rotational axis of the rotor.

  If the through hole of the rotor is formed with an inclination in one direction in the radial direction of the rotor, when the rotor rotates, the refrigerant receives a centrifugal force and does not depend on the rotation direction. Of the openings, the air flows in one direction from one opening relatively close to the rotation axis of the rotor toward the other opening relatively close to the outer peripheral surface. As a result, the rotor is cooled and, as described above, a flow in one direction in the opposite direction is generated in the stator to cool the superconducting coil.

  The larger the inclination of the through hole in the radial direction, the larger the driving force acts on the refrigerant, and a larger amount of refrigerant can be circulated.

  The through hole may have an inclination in one radial direction and may also have an inclination in the circumferential direction. In particular, when the through hole has an inclination in one radial direction and has a circumferential inclination in the direction opposite to the rotation direction from the front end face to the opposite end face as seen from the end face on the refrigerant inflow side. Furthermore, the propulsive force of the refrigerant is increased at the through hole, and the flow rate of the refrigerant can be increased.

(3) The superconducting rotating machine of the present invention is a superconducting rotating machine constituting a motor or a generator,
A superconducting stator comprising a cylindrical stator core having a slot extending between both end faces, and a superconducting coil housed in the slot and formed by winding a superconducting wire;
A rotor provided rotatably with respect to the superconducting stator, and having a central axis of the superconducting stator and a rotation axis arranged coaxially;
The superconducting stator and the rotor are both arranged in a common refrigerant,
Between the peripheral surface forming the slot and the superconducting coil, there is a stator side gap communicating with both axial end surfaces of the stator core,
The rotor has a through-hole or / and a groove that communicates with both axial end faces of the rotor and extends in a direction inclined with respect to the rotation axis;
The rotor includes a cylindrical rotor core in which a plurality of conductor insertion holes and / or conductor insertion grooves are formed near the outer periphery, and a cage conductor made of a superconducting material, and the cage conductor is in the axial direction of the rotor core. and the end ring disposed at both ends of, and a plurality of rotor bars for electrically connecting the end ring at both ends, the rotor bars are being inserted through the conductor insertion hole and / or conductor insertion groove ,
The conductor insertion hole is the through hole, and between the circumferential surface forming the conductor insertion hole and the rotor bar, there is a rotor-side gap that communicates both end faces in the axial direction of the rotor,
The groove is formed on the outer peripheral surface of the rotor core and is formed with the same inclination as the conductor insertion hole with respect to the rotation axis of the rotor .

  The cage conductor may be a combination of a superconducting material and a normal normal material. Examples of the superconducting material include a Bi-based superconducting material and a Y-based superconducting material. Examples of the normal conductive material include copper, aluminum, and silver.

  When the rotor has the structure of a cage-type induction rotating machine, the rotor has a cage conductor made up of a plurality of rotor bars and end rings made of a superconducting material combined with a cylindrical rotor core. The superconducting rotor bar is accommodated in the conductor insertion hole or / and the insertion groove of the rotor core.

  When the conductor insertion hole or / and the conductor insertion groove extends parallel to the rotation axis, the rotor penetrates at an angle with respect to the rotation axis separately from the conductor insertion hole or / and the conductor insertion groove. It is good to have a hole. In this case, the coolant flows in one direction in the axial direction of the rotor with a driving force applied in the through hole. In the conductor insertion hole or / and conductor insertion groove of the rotor extending parallel to the rotation axis, the refrigerant flows through the rotor side gap in the direction opposite to the direction of the refrigerant in the through hole. The refrigerant also flows in a direction opposite to the flow of the refrigerant in the through hole of the rotor also in the gap on the stator side of the slot of the superconducting stator arranged coaxially with the rotor.

  When the conductor insertion hole or / and the conductor insertion groove is inclined with respect to the rotation axis, a propulsive force that allows the refrigerant to flow in one direction is applied to the rotor-side clearance in the conductor insertion hole or / and the conductor insertion groove. Is done. For this reason, the conductor insertion hole or / and the conductor insertion groove constitute the inclined through hole or / and the groove. As described above, the coolant flows through the rotor-side gap formed in the conductor insertion hole or / and the conductor insertion groove, so that a propulsive force is obtained in one direction of the rotation axis by the rotation of the rotor, The rotor and the superconducting stator can be efficiently cooled.

  Even when the conductor insertion hole or / and the conductor insertion groove is inclined with respect to the rotation axis, the rotor has a through hole or an inclination inclined with respect to the rotation axis, separately from the conductor insertion hole or / and the conductor insertion groove. / And a groove | channel can also be provided.

  In this specification, the “conductor insertion hole” refers to a hole that communicates with both end faces of the rotor core and through which the rotor bar is inserted. The conductor insertion hole may be a through hole having an inclination with respect to the rotation axis as defined in (1) above, or may not be a through hole defined in (1) above but with respect to the rotation axis. In some cases, there is no inclination.

  The “conductor insertion groove” refers to a groove that communicates with both end faces of the rotor core and that is also open on the outer peripheral surface of the rotor core and through which the rotor bar is inserted. The conductor insertion groove may be a groove having an inclination with respect to the rotation axis as defined in the above (1), or may not be a groove defined in the above (1) and having an inclination. .

  Since the conductor insertion hole also serves as the through hole, the refrigerant flows through the rotor-side gap in the conductor insertion hole, and the rotor bar can be cooled efficiently. Since there is no need to separately form through holes in the rotor core, there is no influence on the magnetic circuit.

  Since the conductor insertion hole and the groove formed on the outer peripheral surface of the rotor are formed with the same inclination, the refrigerant flows in the same direction in the conductor insertion hole and the groove. Accordingly, the amount of refrigerant flowing through the stator side gap increases, and the superconducting coil on the stator side can be effectively cooled.

In said (3), it is preferable that the said groove | channel exists in the position of the same angle as the said conductor insertion hole with respect to the circumferential direction of the rotating shaft of the said rotor.

  Since the groove opened in the outer peripheral surface of the rotor core has the same inclination as the conductor insertion hole through which the rotor bar penetrates, and is formed at the same angular position as the conductor insertion hole in the circumferential direction with respect to the rotation axis of the rotor, It is off from the magnetic circuit composed of the stator core and the rotor core. For this reason, there is no adverse effect on the motor characteristics. Rather, the magnetic flux generated by the superconducting coil on the stator side passes between the stator on the outer side of the rotor bar and is prevented from crossing the rotor bar (leakage magnetic flux). For this reason, motor performance can be expected to improve slightly. Therefore, the motor can be cooled to a stable temperature without affecting the motor performance.

(4) The superconducting rotating machine of the present invention is a superconducting rotating machine constituting a motor or a generator,
A superconducting stator comprising a cylindrical stator core having a slot extending between both end faces, and a superconducting coil housed in the slot and formed by winding a superconducting wire;
A rotor provided rotatably with respect to the superconducting stator, and having a central axis of the superconducting stator and a rotation axis arranged coaxially;
The superconducting stator and the rotor are both arranged in a common refrigerant,
Between the peripheral surface forming the slot and the superconducting coil, there is a stator side gap communicating with both axial end surfaces of the stator core,
The rotor has a through-hole or / and a groove that communicates with both axial end faces of the rotor and extends in a direction inclined with respect to the rotation axis;
The rotor includes a cylindrical rotor core in which a plurality of conductor insertion holes and / or conductor insertion grooves are formed near the outer periphery, and a cage conductor made of a superconducting material, and the cage conductor is in the axial direction of the rotor core. End rings arranged at both ends of the plurality of rotor bars, and a plurality of rotor bars electrically connecting the end rings at both ends, the rotor bars being inserted into the conductor insertion holes and / or conductor insertion grooves. ,
The conductor insertion groove is the groove, and the conductor insertion groove opens on the outer peripheral surface of the rotor core, and is formed between the peripheral surface forming the conductor insertion groove and the outer peripheral virtual surface of the rotor core, and the rotor bar. and having a rotor side gap communicating both end faces in the axial direction of the rotor.

  Grooves opened in the outer peripheral surface of the rotor core communicate with both end surfaces of the rotor and extend in a direction inclined with respect to the rotation axis. The groove opens to the outer peripheral surface of the rotor core. The conductor insertion groove also serves as a groove through which the refrigerant flows, and the rotor bar is inserted therethrough. A rotor-side gap that communicates both end faces of the rotor is formed between the rotor bar and the peripheral surface forming the conductor insertion groove and the virtual outer periphery of the rotor core. When the rotor-side gap of the groove is formed on the outer side in the radial direction of the rotor bar, the refrigerant flowing through the gap between the rotor and the superconducting stator is guided by the refrigerant flow in the rotor-side gap of the groove and is the same Flow in the direction. For this reason, the rotor bar is also efficiently cooled by the refrigerant.

(5) The superconducting rotating machine of the present invention is a superconducting rotating machine constituting a motor or a generator,
A superconducting stator comprising a cylindrical stator core having a slot extending between both end faces, and a superconducting coil housed in the slot and formed by winding a superconducting wire;
A rotor provided rotatably with respect to the superconducting stator, and having a central axis of the superconducting stator and a rotation axis arranged coaxially;
The superconducting stator and the rotor are both arranged in a common refrigerant,
Between the peripheral surface forming the slot and the superconducting coil, there is a stator side gap communicating with both axial end surfaces of the stator core,
The rotor has a through-hole or / and a groove that communicates with both axial end faces of the rotor and extends in a direction inclined with respect to the rotation axis;
The rotor is accommodated in the coil insertion groove, and a cylindrical rotor core having coil insertion grooves formed in the vicinity of the outer periphery thereof, which communicate with both axial end faces of the rotor and extend in a direction inclined with respect to the rotation axis. Rotor side superconducting coil,
The coil insertion groove is the groove, and the axial end surfaces of the rotor are communicated between the rotor-side superconducting coil, the peripheral surface forming the coil insertion groove, and the outer peripheral virtual surface of the rotor core. and having a rotor-side gap.

  When the rotor-side superconducting coil is arranged in the rotor core, the rotor-side superconducting coil functions as a field rotor that generates a strong magnetic field by passing a current through the rotor-side superconducting coil. The coil insertion groove opened on the outer peripheral surface of the rotor is formed with an inclination in the circumferential direction. For this reason, the refrigerant flows through the rotor-side gap of the coil insertion groove, and the rotor-side superconducting coil is stably cooled. Furthermore, since the field also has an inclination in the circumferential direction, the motor performance is improved, for example, the occurrence of abnormal torque is suppressed.

In any one of the above (1) to (5) and the following (6), a gap formed between the superconducting stator and the rotor is formed in a side opening of the slot that opens to the inner peripheral surface of the stator core. It is preferable that a partition member for partitioning the slot is disposed.

  The stator side gap in the stator slot is partitioned by the partition member from the gap between the stator and the rotor. For this reason, it is possible to prevent the refrigerant from leaking from the slot through the side opening to the gap. Therefore, it is possible to stably flow the coolant through the stator-side gap in the slot, and it is possible to cool the superconducting coil stably.

(6) The superconducting rotating machine of the present invention is a superconducting rotating machine constituting a motor or a generator,
A superconducting stator comprising a cylindrical stator core having a slot extending between both end faces, and a superconducting coil housed in the slot and formed by winding a superconducting wire;
A rotor provided rotatably with respect to the superconducting stator, and having a central axis of the superconducting stator and a rotation axis arranged coaxially;
The superconducting stator and the rotor are both arranged in a common refrigerant,
Between the peripheral surface forming the slot and the superconducting coil, there is a stator side gap communicating with both axial end surfaces of the stator core,
The rotor has a through-hole or / and a groove that communicates with both axial end faces of the rotor and extends in a direction inclined with respect to the rotation axis;
The sum of the radial cross-sectional area of the stator-side gap of the superconducting stator formed in a plurality of said slots being larger than the cross-sectional area of the radial gap between the superconducting stator and rotor .

  In this case, the refrigerant easily flows into the stator-side gap in the slot, and the superconducting coil in the slot can be reliably cooled. On the other hand, if the sum of the radial cross-sectional areas of the stator-side gaps formed in the slots of the superconducting stator is equal to or smaller than the radial cross-sectional area of the gap between the superconducting stator and the rotor, the slot There is a risk that the refrigerant will not flow easily.

In any one of the above (1) to (6), when the rotor rotates, the refrigerant passes through the through-holes and / or grooves in the rotor from one end surface in the axial direction of the rotor. In the superconducting stator, it is preferable that the stator side gap of the slot is circulated in a direction opposite to the direction in the rotor.

  The refrigerant circulates between the rotor and the superconducting stator, so that the rotor and the superconducting stator can be effectively cooled. In addition, the superconducting coil can be efficiently cooled.

The method for cooling a superconducting rotating machine according to the present invention comprises a superconducting stator comprising a cylindrical stator core having a slot extending between both end faces, and a superconducting coil formed by winding a superconducting wire housed in the slot. And a method of cooling a superconducting rotating machine constituting a motor or a generator, comprising a rotor in which a central axis and a rotating shaft of the superconducting stator are coaxially arranged, the superconducting stator and the rotor, By arranging both in the common refrigerant, the through hole or / and groove extending in the direction in which the refrigerant is communicated with both end surfaces in the axial direction of the rotor and inclined with respect to the rotation axis is formed in the rotor. And is passed from one end surface side in the axial direction of the rotor to the other end surface side, and is formed between a peripheral surface forming the slot and the superconducting coil and The refrigerant passes through the stator-side gap communicating with both end faces of the rotor core and flows in the direction opposite to the direction of the rotor, and the refrigerant is passed through the through-hole or / and groove of the rotor and the stator-side gap of the stator core. Circulate between.

  When the refrigerant flows through a through hole or / and a groove extending in a direction inclined with respect to the rotation axis of the rotor, a propulsive force that flows in one direction in the refrigerant is obtained. Thereby, a refrigerant | coolant circulates between a rotor and a superconducting stator, and a rotor and a superconducting stator can be cooled effectively. In addition, the superconducting coil can be efficiently cooled.

  According to the present invention, the rotor has a through hole or / and a groove extending in a direction inclined with respect to the rotation axis of the rotor. Therefore, a propulsive force is obtained for the refrigerant flowing through the through hole or / and the groove by the rotation of the rotor. For this reason, the superconducting coil can be efficiently cooled.

It is sectional drawing of the rotary machine of Embodiment 1 of this invention. 3 is a plan view of the superconducting stator of Embodiment 1. FIG. FIG. 3 is a partial perspective view of a superconducting coil on the stator side according to the first embodiment. It is a top view of the superconducting stator from which arrangement | positioning of the superconducting coil of Embodiment 1 differs. FIG. 3 is a perspective explanatory view of a rotor for explaining an inclination of one conductor insertion hole in the first embodiment. FIG. 3 is a perspective view of a cage conductor according to the first embodiment. FIG. 7 is a cross-sectional view of the rotor for explaining the rotor-side gap formed in the conductor insertion hole of the first embodiment, and FIG. 7A shows a case where the rotor-side gap is formed on the radially inner side of the conductor insertion hole; FIG. 7B shows a case where a frame-like rotor-side gap is formed around the rotor bar, FIG. 7C shows a case where a rotor-side gap is formed on the radially inner side and the outer side of the rotor bar, and FIG. When the rotor side gap is formed on the radially outer side of the rotor bar, FIG. 7E shows the case where the rotor side gap is formed on the radially inner side of the rotor bar. It is side surface explanatory drawing of the rotor for demonstrating the projection part of Embodiment 1. FIG. FIG. 3 is a plan view of the rotor for explaining the position of the protrusion in the first embodiment. It is side surface explanatory drawing of the rotor at the time of providing the recessed part of Embodiment 1. FIG. It is a top view of a rotor at the time of providing a crevice of Embodiment 1. It is sectional drawing of the rotary machine of Embodiment 2. FIG. It is a perspective explanatory view of the rotor for explaining the inclination of the conductor insertion groove of the rotor according to the second embodiment. FIG. 14A is a cross-sectional view of the rotor for explaining the positional relationship between the groove and the conductor insertion hole in the second embodiment, and FIG. 14A shows a case where the groove and the conductor insertion groove have different circumferential positions; b) shows the case where the groove and the conductor insertion groove have the same circumferential position. It is sectional drawing of the rotary machine of Embodiment 3. It is a perspective explanatory view of the rotor for explaining the inclination of the conductor insertion groove of the rotor according to the third embodiment. FIG. 17 is a cross-sectional view of a rotor for explaining a rotor-side gap formed in a conductor insertion groove of Embodiment 3, and FIG. 17A shows a case where the rotor-side gap is formed on the radially inner side of the conductor insertion groove; FIG. 17B shows the case where the rotor side gap is formed on the radially inner side and the radially outer side of the conductor insertion groove, and FIG. 17C shows the case where the rotor side gap is formed on the radially outer side of the rotor bar. d) shows a case where a rotor side clearance is formed around the rotor bar. It is sectional drawing of the rotary machine of Embodiment 4. It is a perspective explanatory view of the rotor for explaining the inclination of the conductor insertion hole and the through hole of the rotor of the fourth embodiment. It is a perspective view of the rotor which provided the rotor side superconducting coil of Embodiment 5. FIG.

(Embodiment 1)
A superconducting rotating machine and a cooling method thereof according to an embodiment of the present invention will be described in detail with reference to the drawings.

  The superconducting rotating machine is a superconducting motor for vehicle mounting, industrial use, and home use. As shown in FIG. 1, the superconducting rotating machine includes a superconducting stator 1 that functions as a stator having a rotor chamber 1r, a rotor 5 that functions as a rotor, and a refrigerant 4. Superconducting stator 1, rotor 5, and refrigerant 4 are accommodated in case 3.

  As shown in FIGS. 1 and 2, the superconducting stator 1 has a stator core 11 having a core center line P <b> 1 and a superconducting coil 2 formed by winding a superconducting wire. The stator core 11 has a cylindrical shape formed around the core center line P1. The stator core 11 is made of a material having a high magnetic permeability (for example, iron), and functions as an iron core of a magnetic circuit that guides the magnetic field generated by the superconducting coil 2 to the rotor 5. The stator core 11 has a cylindrical shape and includes ring-shaped end faces 11a and 11b formed on both sides in the axial direction, an inner peripheral portion 11c, and an outer peripheral portion 11d.

  In the inner peripheral portion 11c of the stator core 11, a plurality of slots 12 and teeth 13 are alternately arranged in parallel in the circumferential direction around the core center line P1. The slot 12 and the teeth 13 extend along the centripetal direction toward the core center line P1. A plurality of superconducting coils 2 are arranged side by side along the circumferential direction around the core center line P <b> 1 on the inner peripheral side of the stator core 11.

  As shown in FIG. 3, the superconducting coil 2 is formed by covering a superconducting material with a coating layer. Examples of the superconducting material used for the superconducting coil 2 include a Bi-based superconducting material and a Y-based superconducting material. The superconducting coil 2 is particularly preferably formed of a Bi-based high temperature superconducting material. The superconducting coil 2 is formed by winding a tape-shaped superconducting wire into a racetrack (track and field) shape a plurality of times. The superconducting coil 2 has a straight portion 21 in which a superconducting wire is extended in a straight shape, and a bent portion 22 in which the superconducting wire is bent in a circular arc shape. The straight portion 21 of the superconducting coil 2 is inserted into the slot 12. The bending portion 22 is installed on the outside of the plurality of teeth 13 and the plurality of slots 12 so as to straddle them. Both ends of the superconducting coil 2 have lead wires 23.

  In this embodiment, as shown in FIG. 2, the superconducting coil 2 is arranged in the slot 12 at two locations near the side opening 12 c and near the bottom. One superconducting coil 2 is disposed across the two teeth 13 and the slot 12 therebetween.

  Further, as shown in FIG. 4, the superconducting coil 2 may be arranged in a double ring shape. In this case, the straight portions 21 of the superconducting coil 2 may be arranged alternately in the slots arranged in the circumferential direction. Thereby, a sufficient stator side gap 12s can be formed between the peripheral surface of the slot 12 and the superconducting coil 2, and the cooling efficiency of the superconducting coil 2 is increased.

  In addition, the superconducting coil 2 may be arranged only at the center of the slot 12, and the shape of the slot 12 is periodically changed for each of a plurality of slots 12 arranged in the circumferential direction. The arrangement position of the superconducting coil 2 may be changed for each slot 12. In any case, a stator-side gap 12 s that communicates the both end surfaces 11 a and 11 b of the stator core 11 is formed between the peripheral surface of the slot 12 and the superconducting coil 2.

  As shown in FIG. 1, the case 3 has a cylindrical shape covering the outer peripheral portion 11d of the stator core 11, and is formed of a nonmagnetic material such as austenitic stainless steel or hard resin. The lead wire 23 is held by a connection terminal (not shown) fixed to the case 3 and is electrically connected to the outside of the case 3.

  As shown in FIGS. 1 and 2, the slot 12 has end surface openings 12 a and 12 b that open to both end surfaces 11 a and 11 b of the stator core 11, and a side surface opening 12 c that opens to the inner peripheral portion 11 c of the stator core 11. Side opening 12 c of slot 12 is partitioned by partition member 26 and partitions slot 12 and gap 10 between rotor 5 and superconducting stator 1. The partition member 26 is a long thin plate. The side opening 12 c of the slot 12 is sealed between the both end faces 11 a and 11 b in the axial direction of the stator core 11 by the partition member 26. The partition member 26 may be a nonmagnetic material or a magnetic material. Examples of the nonmagnetic material used for the partition member 26 include fiber reinforced plastic (FRP). Examples of the magnetic material used for the partition member 26 include a magnetically permeable material such as iron or an iron alloy, an insulating skin-covered soft magnetic powder material, and ferrite.

  The partition member 26 is preferably thinner. When the partition member 26 is made of a magnetic material, the magnetic field may change if it is thick. When the partition member 26 is made of a nonmagnetic material, the superconducting coil 2 is separated from the rotor 5, and the magnetic flux generated from the superconducting coil 2 may not reach the rotor 5. Considering the rigidity of the partition member 26, the thickness of the partition member 26 is preferably about 0.1 to 5 mm.

  The enlarged view of the frame-enclosed portion in FIG. 2 shows a partially enlarged sectional view in the vicinity of the slot. As shown in the partial enlarged cross-sectional view of FIG. 2, after inserting the superconducting coil 2 into the slot 12, the side peripheral edge of the partition member 26 is locked to the concave strip 12 d formed at the peripheral edge of the side opening 12 c of the slot 12. Is done. As a result, the side opening 12 c of the slot 12 is blocked by the partition member 26.

  As shown in FIG. 1, the case 3 has a cylindrical shape that covers the outer peripheral portion 11 d of the stator core 11 of the superconducting stator 1. Case 3 houses superconducting stator 1, rotor 5, and refrigerant 4. The case 3 is formed of a nonmagnetic material such as austenitic stainless steel or hard resin.

  A rotor 5 is disposed in the rotor chamber 1 r of the superconducting stator 1. In the rotor 5, the core center line P <b> 1 that is the central axis of the superconducting stator 1 and the rotation axis are arranged coaxially. A minute gap 10 having a ring shape that allows smooth rotation of the rotor 5 is formed between the rotor 5 and the superconducting stator 1.

  The rotor 5 includes a rotating shaft 51, a cylindrical rotor core 6 having a shaft hole 6 d through which the rotating shaft 51 is inserted, a conductor insertion hole 61 formed in the outer peripheral portion 6 c of the rotor core 6, and a conductor insertion hole 61. And a cage-shaped conductor 7.

  As shown in FIG. 2, the total radial sectional area of the stator-side gap 12 s formed in the slot 12 of the superconducting stator 1 is based on the radial sectional area of the gap 10 between the superconducting stator 1 and the rotor 5. Is also big. Here, “the radial cross-sectional area of the stator-side gap 12 s” is a radial cross-sectional area obtained by excluding the radial cross-sectional area occupied by the superconducting coil 2 in the slot 12 from the radial cross-section of the slot 12. The “total radial cross-sectional area of the stator-side gap 12 s” refers to the total radial cross-section of the stator-side gap 12 s formed in the plurality of slots 12 provided in the superconducting stator 1. The “cross-sectional area in the radial direction of the gap 10” is the area of the radial cross-section of the ring-shaped gap 10 formed between the inner peripheral portion 11 c of the stator core 11 and the outer peripheral portion 6 c of the rotor core 6 of the rotor 5. .

  As shown in FIG. 5, the rotor core 6 is formed by laminating electromagnetic steel plates such as silicon steel plates in the axial direction. In the vicinity of the outer peripheral portion 6 c of the rotor core 6, a plurality of conductor insertion holes 61 are formed in the circumferential direction. The conductor insertion hole 61 communicates both end faces 6 a and 6 b in the axial direction of the rotor core 6. The conductor insertion hole 61 has end surface openings 61 a and 61 b that open to the end surfaces 6 a and 6 b in the axial direction of the rotor core 6.

  FIG. 5 is a perspective view of the rotor core 6 for illustrating the inclination of one conductor insertion hole 61 formed in the rotor core 6. As shown in FIG. 5, the extending direction of the conductor insertion hole 61 is inclined in one direction in the circumferential direction of the rotor 5. On the paper of FIG. 5, the end surface opening 61b that opens to the other end surface 6b is located counterclockwise with respect to the end surface opening 61a that opens to one end surface 6a of the rotor core 6, and one end surface opening 61a. Toward the other end face opening 61b in the circumferential direction at a predetermined inclination angle θ.

  In FIG. 5, P <b> 1 is a core center line extending coaxially with respect to the axis center of the stator core 11 and the rotation axis of the rotor 5. P <b> 2 is a first radial center line passing through the core center line P <b> 1 and the circumferential center of the end surface opening 61 a on the one end surface 6 a of the conductor insertion hole 61. P3 is a second radial center line having the same position in the circumferential direction as the first radial center line P2 on the other end face 6b. P4 is an outer peripheral center line that is on the outer peripheral portion 6c of the rotor core 6 and that connects the first and second radial center lines P2 and P3 and extends in parallel with the core center line P1. P <b> 5 is a hole center line that is located at the circumferential center of the conductor insertion hole 61 and extends in the extending direction of the conductor insertion hole 61. P6 is the amount of deviation in the circumferential direction between one end face opening 61a and the other end face opening 61b of the conductor insertion hole 61. The angle formed by the outer peripheral center line P4 and the hole center line P5 is the inclination angle θ. The inclination angle θ represents the inclination of the conductor insertion hole 61 with respect to the axial direction, and is preferably 1 to 10 °, for example. The inclination angle θ of the conductor insertion hole 61 is such that the circumferential shift amount P6 between the one end surface opening 61a and the other end surface opening 61b of the conductor insertion hole 61 is within a range up to one pitch of the conductor insertion hole 61. It is good to do.

  As shown in FIG. 6, the cage conductor 7 is made of a Bi-based superconducting material. The cage conductor 7 has a cage shape as a whole, and includes a plurality of rotor bars 71 and a ring-shaped end ring 72 that connects the ends of the rotor bars 71. The rotor bar 71 is inclined at a constant inclination angle θ in the circumferential direction. The plurality of rotor bars 71 are arranged in parallel in the circumferential direction with a uniform interval in parallel to each other.

  The rotor bar 71 has a rectangular cross section. The rotor bar 71 is formed by coating a plurality of Bi-based high-temperature superconducting filaments with a conductive metal such as silver.

  As shown in FIG. 5 and FIG. 9 described later, the rotor bar 71 is inserted into the conductor insertion hole 61 of the rotor core 6. The cross-sectional size of the rotor bar 71 is smaller than the cross-sectional size of the conductor insertion hole 61, and a rotor-side gap 61 s is formed between the rotor bar 71 and the peripheral surface forming the conductor insertion hole 61. The conductor insertion hole 61 also serves as the through hole 65, and the coolant flows in the rotor-side gap 61 s in the conductor insertion hole 61. The conductor insertion hole 61 corresponds to a through-hole 65 that is connected to both axial end faces 6 a and 6 b of the rotor core 6 and extends in a direction inclined with respect to the rotation shaft 51. The rotor-side gap 61 s extends along the conductor insertion hole 61 and communicates the both end faces 6 a and 6 b of the rotor core 6 of the rotor 5. The rotor-side gap 61s is inclined with respect to the core center line P1 (rotation axis) along the inclination direction θ of the conductor insertion hole 61.

  Examples of the rotor-side gap 61s formed in the conductor insertion hole 61 include those listed in FIG. In the example shown in FIG. 7A, the rotor bar 71 and the peripheral surface 61d on the outer peripheral side of the conductor insertion hole 61 are in contact with each other, the surfaces on both sides in the circumferential direction of the rotor bar 71, and the conductor insertion hole 61 facing this surface. One rotor-side gap having a U-shaped cross section formed between the inner peripheral surface 61d of the rotor bar 71 and the inner peripheral surface 61d of the conductor insertion hole 61 facing this surface. 61s is formed.

  In the example shown in FIG. 7B, the entire periphery of the rectangular rotor bar 71 is away from the entire surface of the rotor bar 71, and one rotor-side gap 61s having a frame shape is formed. In the example shown in FIG. 7C, both circumferential surfaces of the rotor bar 71 are in contact with the conductor insertion holes 61, both the radially inner and outer surfaces of the rotor bar 71, and the conductor insertion holes 61 facing this surface. Two rotor-side gaps 61s are formed between the outer circumferential surface 61d of the two rotors.

  In the example shown in FIG. 7D, both the circumferential direction both sides and the radially inner side of the rotor bar 71 are in contact with the circumferential surface 61d of the conductor insertion hole 61, the radially outer surface of the rotor bar 71, and the conductor facing this surface. One rotor-side gap 61 s is formed between the circumferential surface 61 d of the insertion hole 61.

  In the example shown in FIG. 7 (e), both the circumferential direction sides and the radially outer side of the rotor bar 71 are in contact with the circumferential surface 61d of the conductor insertion hole 61, the radially inner surface of the rotor bar 71, and the conductor facing this surface. One rotor-side gap 61 s is formed between the circumferential surface 61 d of the insertion hole 61.

  Among these, from the viewpoint of motor performance, the rotor bar 71 is as close to the superconducting stator 1 as possible, and from the viewpoint of the efficiency of cooling the rotor bar 71, the shape shown in FIG. A rotor side clearance 61s is preferable.

  Further, the ratio of the area of the radial cross section of the rotor-side gap 61s formed in one conductor insertion hole 61 to the area of the radial cross section of one conductor insertion hole 61 is preferably as large as possible, for example, 10 to 80%. It is good to do. The area of the radial cross section of the rotor-side gap 61s formed in one conductor insertion hole 61 is an area obtained by subtracting the cross-sectional area occupied by the rotor bar 71 from the radial cross-sectional area of one conductor insertion hole 61.

  FIG. 8 is a side view of the rotor 5 schematically showing one through hole 65. As shown in FIG. 8, in the peripheral edge of the opening at the end surface openings 65 a and 65 b of the through hole 65, the extending direction of the through hole 65 is a circumferential direction having a large angle α formed between the end surfaces 6 a and 6 b of the rotor core 6 and the rotor 5 outside. The one side portion A is higher in the rotation axis direction than the other side portion B in the circumferential direction having a small angle β formed between the end faces 6 a and 6 b of the rotor core 6 and the outside of the rotor 5. That is, the angle α formed by the one side portion A of the opening peripheral edge of the through-hole 65 with the end surfaces 6 a and 6 b outside the rotor 5 is larger than the angle β formed by the other side portion B with the end surfaces 6 a and 6 b and the rotor 5 outside. (Α> β). The one side portion A having a large angle α is provided with a protruding portion 60 that protrudes higher in the axial direction than the end surfaces 6a and 6b.

  FIG. 9 is a plan view showing one end face of the rotor 5. As shown in FIG. 9, the protrusion 60 is disposed long so as to be substantially along the first radial center line P2. The protrusion 60 extends in a direction inclined with respect to the radial direction from the one side portion A of the opening peripheral edge of the conductor insertion hole 61 having the rotor-side gap 61s to the first radial center line P2. The longer the protrusion 60, the more refrigerant can flow into the rotor-side gap 61s.

  As shown in FIG. 8, the protrusion 60 has the highest portion close to the through hole 65 and gradually decreases in height as the protrusion 60 is separated from the through hole 65. The higher the height from the end faces 6a, 6b of the protrusion 60, the more refrigerant 4 can flow into the rotor-side gap 61s. However, if the height is excessively high, the flow resistance of the refrigerant 4 will occur. Efficiency may be reduced. The height H1 of the highest portion of the protrusion 60 from the end faces 6a, 6b is preferably about 0.1 mm to 10 mm at most.

  On the paper surface of FIG. 9, the projecting portion 60 protrudes counterclockwise in the circumferential direction of the through hole 65 on the end surface 6 a of the rotor core 6 on the refrigerant inflow side. In this case, when the rotor 5 is rotated clockwise, the refrigerant flows in the counterclockwise direction on the end surface 6 a relative to the rotor 5. The refrigerant flowing counterclockwise strikes the protrusion 60 and moves radially outward along the side surface of the protrusion 60 by centrifugal force. Eventually, it flows into the rotor-side gap 61s of the through hole 65 disposed in the vicinity of the outer peripheral portion 6c of the rotor core 6.

  As shown in FIGS. 8 and 9, when the rotation direction of the rotor 5 is counterclockwise, the refrigerant passes through the rotor side gap 61s of the through hole 65 from the end surface opening 65b of the other end surface 6b. It distribute | circulates toward the end surface opening 65a of one end surface 6a. Also in this case, the protrusion 60 is provided on the one side portion A opposite to the rotation direction at the opening peripheral edge of the end face opening 65 b of the other end face 6 b of the rotor core 6. For this reason, the refrigerant | coolant which moves on the other end surface 6b can be efficiently poured in into the rotor side clearance gap 61s of the through-hole 65. FIG.

  Thus, by providing the protrusion 60 at the opening peripheral edge of the end face openings 65a and 65b of the through hole 65, the refrigerant flowing on the end faces 6a and 6b on the opposite side to the rotation direction is collected and flows into the rotor side gap 61s. . As a result, a large amount of refrigerant can flow into the rotor-side gap 61s of the through hole 65, and the cooling efficiency is further increased.

  Further, as shown in FIGS. 10 and 11, the large angle α is set so that the one side portion A having a large angle α is relatively higher than the other side portion B having an angle β smaller than the angle α. A recess 69 may be formed in the other side portion B having an angle β smaller than the angle α with respect to the one side portion A having. The recess 69 is continuously connected to the through hole 65. The recess 69 has a shape in which the opening periphery of the so-called through-hole 65 is chamfered.

  The recess 69 preferably has an elongated shape so as to substantially follow the radial center line P2. The recess 69 preferably extends long in a direction inclined with respect to the radial direction from the other side portion B of the opening peripheral edge portion of the through hole 65 having the rotor-side gap 61s to the first radial center line P2. The longer the recess 69 is, the more refrigerant 4 can flow into the rotor-side gap 61s of the through hole 65. Due to the viscous force acting on the refrigerant, the refrigerant 4 enters the recess 69 and flows into the through hole 65.

  The recess 69 formed on one end surface 6a of the rotor core 6 is not only the first side 65c facing the other side portion B in the circumferential direction of the end surface opening 65a forming the through hole 65, but also on the radially inner side. The second side 65d is also formed continuously. The shape of the recess 69 substantially matches the shape of the other side portion B where the protrusion 60 is not formed in FIGS. The recess 69 gradually becomes deeper as it approaches the through-hole 65 from the radially inner tip far from the through-hole 65.

  The recess 69 formed on the other end surface 6b of the rotor core 6 faces the other side portion B in the circumferential direction in the end surface opening 65b that forms the through hole 65, similarly to the recess 69 formed on the one end surface 6a. It is continuously formed not only on the first side but also on the second side on the radially inner side. The shape of the concave portion 69 matches the shape of the other side portion B in which the protruding portion 60 is not formed in FIGS. The recess 69 gradually becomes deeper as it approaches the through-hole 65 from the radially inner tip far from the through-hole 65.

  In FIG. 8 and FIG. 9, one protrusion 60 is shown on one end surface 6 a, but the protrusion 60 may be provided on one side portion A of the opening peripheral edge of the plurality of through holes 65. In FIG. 10 and FIG. 11, one concave portion 69 is shown on one end face 6 b, but a protruding portion 60 may be provided on the other side portion B of the opening peripheral portion of the plurality of through holes 65. Any of the protrusions 60 and the recesses 69 may be provided corresponding to all the through holes 65, or may be provided in a part of the plurality of conductor insertion holes 61.

  As shown in FIG. 1, the refrigerant 4 is accommodated in the case 3 together with the rotor 5 and the superconducting stator 1. The rotor 5 and the superconducting stator 1 are arranged in a common refrigerant 4. The refrigerant 4 cools the superconducting material used for the superconducting coil 2 of the superconducting stator 1 and the cage conductor 7 of the rotor 5 below its superconducting critical temperature Tc to reduce the electric resistance to zero or extremely low, The electrical resistance is reduced by cooling (copper, aluminum, etc.). As the refrigerant 4, for example, a liquid refrigerant such as nitrogen, air, argon, neon, hydrogen, and helium in a liquid state and a gaseous refrigerant such as nitrogen, air, argon, neon, hydrogen, and helium in a gas state are used. A cryogenic refrigerator for cooling the refrigerant 4 is mounted in the vicinity of the motor.

  When the motor is driven, a plurality of superconducting coils 2 provided in the superconducting stator 1 are energized in the three-phase AC U phase, V phase, and W phase. There are a superconducting coil 2 in which the U phase of the three-phase alternating current is energized, a superconducting coil 2 in which the V phase is energized, and a superconducting coil 2 in which the W phase is energized. The superconducting coils 2 to which the U phase is energized are directly electrically connected. The superconducting coils 2 through which the V phase is energized are directly electrically connected. The superconducting coils 2 to which the W phase is energized are directly electrically connected.

  In this embodiment, the rotor 5 and the superconducting stator 1 are in a common refrigerant 4. The superconducting stator 1 has a slot 12 for accommodating the superconducting coil 2, and both end faces 11 a and 11 b of the stator core 11 of the superconducting stator 1 are communicated between the peripheral surface forming the slot 12 and the superconducting coil 2. A stator side gap 12s is formed. For this reason, the refrigerant 4 can flow through the stator-side gap 12s, and the superconducting coil 2 can be cooled.

  The rotor core 6 of the rotor 5 is formed with a plurality of conductor insertion holes 61 that communicate with both end faces 6 a and 6 b and extend in a direction inclined with respect to the rotation shaft 51 that is not parallel to the rotation shaft 51. In the conductor insertion hole 61, a rotor-side gap 61 s between the rotor bar 71 is formed. For this reason, when the rotor 5 rotates, a viscous force acts on the end face openings 61 a and 61 b of the conductor insertion holes 61 that open on both end faces 6 a and 6 b of the rotor core 6 due to the difference in the speed of the refrigerant, and is parallel to the conductor insertion holes 61. The refrigerant 4 flows in the rotor-side gap 61s in one direction of the conductor insertion hole 61 depending on the component.

  As a result, in the superconducting stator 1, the refrigerant 4 flows in a direction opposite to that in the rotor 5 through the stator-side gap 12 s between the peripheral surface forming the slot 12 and the superconducting coil 2. The refrigerant also flows in the gap 10 between the rotor 5 and the superconducting stator 1 in the direction opposite to that in the rotor 5. As a result, a flow of the refrigerant 4 that circulates in one direction with respect to the rotating shaft 51 is generated, and the superconducting stator 1 and the rotor 5 can be efficiently cooled.

  As shown in FIGS. 8 and 9, when the end surface 6 a of the rotor core 6 is viewed from the axial direction, the through hole 65 is inclined in the counterclockwise direction from the front end surface 6 a of the rotor core 6 toward the opposite end surface 6 b. When the rotor 5 is formed to be held, when the rotor 5 rotates clockwise, the refrigerant flows from the front end surface opening 65a toward the opposite end surface opening 65b through the rotor side gap 61s of the through hole 65. On the contrary, when the rotor 5 rotates counterclockwise, the rotor 5 flows from the opposite end surface opening 65b toward the front end surface opening 65a.

  The rotor-side gap 61s through which the refrigerant 4 flows communicates with both axial end faces 6a and 6b of the rotor core 6, and the superconducting stator 1 has both axial end faces 11a between the slot 12 and the superconducting coil 2. , 11b, there is a stator side gap 12s through which the refrigerant 4 flows. For this reason, the refrigerant 4 circulates over the entire axial direction of the superconducting stator 1. Therefore, the superconducting coil 2 can be cooled with high efficiency.

  Thus, if the refrigerant 4 is a liquid refrigerant, it is not necessarily a gas refrigerant, and a propulsive force can be obtained when it passes through the through-hole 65 that is not parallel to the rotation axis of the rotor 5. For this reason, in the superconducting stator 1, it can flow stably in the direction opposite to that in the rotor 5. Therefore, the heat generated in the superconducting coil 2 can be efficiently removed without staying in the slot 12, and the superconducting coil 2 can be cooled to a stable temperature.

  Further, in the case of a liquid refrigerant, the refrigerant bubbles generated in the slot 12 can be discharged to the outside of the slot 12, so that the superconducting coil 2 can be cooled stably. Also in the rotor 5, the refrigerant flows in one direction, so that it can be cooled to a stable temperature as with the superconducting stator 1.

  In addition, although the rotary machine of this embodiment is used as a superconducting motor, it can also be used as a generator with the same configuration.

(Embodiment 2)
The rotating machine of the second embodiment differs from that of the first embodiment in that the rotor 5 has a groove 68 in addition to the conductor insertion hole 61 into which the rotor bar 71 is inserted, as shown in FIGS. To do.

  The groove 68 is formed outside the conductor insertion hole 61 in the radial direction of the rotor 5. The groove 68 has a side opening 68c that opens to the surface of the outer peripheral portion 6c of the rotor core 6, and end face openings 68a and 68b that open to both end faces 6a and 6b in the axial direction of the rotor core 6. The radial cross-sectional shape of the groove 68 is rectangular. The groove 68 communicates with the gap 10 through the side opening 68c.

  The conductor insertion hole 61 is inclined at an inclination angle θ in the circumferential direction of the rotor core 6 with respect to the rotation shaft 51 as in the first embodiment. The groove 68 in this embodiment is inclined at an inclination angle θ in the circumferential direction of the rotor core 6 with respect to the rotating shaft 51 together with the conductor insertion hole 61.

  The depth of the groove 68 (the depth of the groove 68 from the outer peripheral virtual surface of the rotor core 6) is preferably 0.1 mm to several mm, for example. The refrigerant 4 in the gap 10 can also be induced to flow in the same direction as the groove 68 while obtaining high output as close as possible to the superconducting stator 1. For this reason, a propulsive force can be given to a large amount of the refrigerant 4, and the superconducting coil 2 can be cooled with the large amount of the refrigerant 4.

  The arrangement relationship between the groove 68 and the conductor insertion hole 61 is shown in FIG. For example, as shown in FIG. 14A, conductor insertion holes 61 and grooves 68 are arranged at equal intervals in the circumferential direction of the rotor core 6. A groove 68 is formed on the outer side in the radial direction than the conductor insertion hole 61. In the circumferential direction of the rotor core 6, the conductor insertion holes 61 and the grooves 68 are alternately arranged. In this case, since the rotor bar 71 can be brought close to the surface of the outer peripheral portion 6c of the rotor core 6, the rotor bar 71 can be brought close to the superconducting stator 1 and a strong magnetic field can be generated.

  As shown in FIG. 14B, the conductor insertion hole 61 and the groove 68 are arranged at the same position in the circumferential direction of the rotor core 6. FIGS. 12 and 13 each show a case where the conductor insertion hole 61 and the groove 68 are formed at the same position in the circumferential direction as shown in FIG. 14B. In the arrangement relationship shown in FIG. 14B, the groove 68 does not affect the magnetic circuit formed by the stator core 11 and the rotor core 6.

(Embodiment 3)
In the rotating machine according to the third embodiment, as shown in FIGS. 15 and 16, a conductor insertion groove 62 that accommodates the rotor bar 71 of the cage conductor 7 is formed in the outer peripheral portion 6 c of the rotor core 6. The conductor insertion groove 62 has end surface openings 62 a and 62 b that open to both axial end faces 6 a and 6 b of the rotor core 6, and a side surface opening 62 c that opens to the outer peripheral portion 6 c of the rotor core 6.

  The conductor insertion groove 62 also serves as a groove 66 through which the refrigerant 4 flows, and between the circumferential surface forming the rotor bar 71 and the conductor insertion groove 62 and the virtual outer surface of the rotor core 6, both end surfaces in the axial direction of the rotor core 6. Rotor side gaps 62r and 62s communicating with 6a and 6b are formed. The conductor insertion groove 62 is inclined at a predetermined inclination angle θ in the circumferential direction of the rotor core 6 similarly to the conductor insertion hole 61 of the first embodiment.

  As shown in FIG. 17, the rotor bar 71 inserted into the conductor insertion groove 62 and the positions of the rotor-side gaps 62r and 62s have various modes. For example, as shown in FIG. 17A, the rotor bar 71 is moved toward the side opening 62c of the conductor insertion groove 62 so that the outer peripheral surface of the rotor bar 71 coincides with the surface of the outer peripheral portion 6c of the rotor core 6. You may arrange | position so that 62 s of rotor side clearance gaps may be formed in the radial inside of the rotor bar 71. FIG.

  Further, as shown in FIG. 17B, the rotor bar 71 may be arranged at the central portion of the length of the conductor insertion groove 62 in the radial direction. In this case, a rotor-side gap 62 s is formed between the radially inner surface of the rotor bar 71 and the radially inner circumferential surface 62 d of the conductor insertion groove 62. Further, a rotor-side gap 62r is formed between the outer surface of the rotor bar 71 and the side opening 62c of the conductor insertion groove 62 (the outer peripheral virtual surface of the rotor core 6). The rotor-side gap 62r on the radially outer side of the rotor bar 71 has a side opening 62c that opens on the outer peripheral portion 6c of the rotor core 6 on the radially outer side, and communicates with the gap 10 between the rotor 5 and the superconducting stator 1. .

  Further, as shown in FIG. 17C, the rotor bar 71 may be arranged close to the inner side in the radial direction of the conductor insertion groove 62. In this case, the rotor-side gap 62s is not formed on the radially inner side of the rotor bar 71, and the rotor-side gap 62r having a side opening 62c that opens to the outer peripheral portion 6c of the rotor core 6 and communicates with the gap 10 is formed on the radially outer side. Is done.

  As illustrated in FIG. 17D, the circumferential width of the rotor bar 71 may be smaller than the circumferential width of the conductor insertion groove 62, and the rotor bar 71 may be disposed at the center of the conductor insertion groove 62. In this case, a rotor-side gap 62r having a side opening 62c communicating with the gap 10 is formed. The conductor insertion groove 62 shown in FIG. 15 communicates with the gap 10 by disposing the rotor bar 71 in the central portion in the radial direction of the conductor insertion groove 62 as shown in FIG. 17B or 17D. An example is shown in which a rotor-side gap 62r having a side opening 62c and a rotor-side gap 62s having no side opening 62c are formed.

  In the present embodiment, the conductor insertion groove 62 is formed in the rotor core 6, and the rotor bar 71 is inserted into the conductor insertion groove 62. The conductor insertion groove 62 is inclined in one circumferential direction of the rotor 5. Rotor side gaps 62 s and 62 r are formed between the circumferential surface 62 d of the conductor insertion groove 62 and the virtual outer circumferential surface of the rotor core 6 and the rotor bar 71. Therefore, when the rotor 5 is rotated, a propulsive force is obtained when the refrigerant flows through the rotor-side gaps 62 s and 62 r, and the refrigerant flows in one direction through the conductor insertion groove 62 that also serves as the groove 66. In the superconducting stator 1, the refrigerant 4 flows through the stator-side gap 12 s between the peripheral surface of the slot 12 and the superconducting coil 2 in the direction opposite to the flow of the refrigerant 4 in the rotor 5. For this reason, the superconducting coil 2 can be efficiently cooled.

  In particular, as shown in FIG. 15, when the rotor bar 71 is arranged radially inside the conductor insertion groove 62 and the rotor side gap 62 r is formed outside the rotor bar 71 in the radial direction, the rotor side gap 62r is in contact with the gap 10 and induces the propulsive force flowing in the same direction to the refrigerant 4 flowing through the gap 10. For this reason, depending on the arrangement of the rotor bar 71, the rotor side gap 62 r and the gap 10 can further generate a large amount of refrigerant 4 in the same direction by the rotor side gap 62 s. For this reason, a large amount of the refrigerant 4 flows in the opposite direction into the stator-side gap 12s between the superconducting coil 2 and the peripheral surface of the slot 12, and the superconducting coil 2 can be cooled more efficiently.

  The rotor-side gap 62r is in contact with the gap 10. The depth of the rotor-side gap 62r (the depth from the outer virtual surface of the rotor core 6) is preferably 0.1 mm or more and several mm or less, for example. While the rotor bar 71 is brought close to the superconducting stator 1, a propulsive force can be reliably applied to the refrigerant flowing in the rotor-side gap 62r and the gap 10 in contact therewith.

  Also in the present embodiment, as in the first embodiment, the protrusions 60 or the recesses 69 are provided on the peripheral edges of the end surface openings 66a and 66b of the grooves 66 (conductor insertion grooves 62) that open to the end surfaces 6a and 6b of the rotor core 6, The refrigerant 4 may be easily introduced into the groove 66 (conductor insertion groove 62). Others are the same as in the first embodiment.

(Embodiment 4)
As shown in FIGS. 18 and 19, the rotating machine according to the present embodiment has a through hole 63 separate from the conductor insertion hole 67 in the rotor 5 in addition to the conductor insertion hole 67 that accommodates the rotor bar 71. Yes.

  A rotor bar is not inserted into the through hole 63. End face openings 63 a and 63 b of the through holes 63 are opened on both end faces 6 a and 6 b of the rotor core 6. The through-hole 63 is inclined at a predetermined inclination angle θ radially inward from one end face opening 63a toward the other end face opening 63b. Due to the rotation of the rotor 5, the refrigerant 4 receives a centrifugal force in the through hole 63 and flows from the other end surface 63 b to the one end surface 63 a. The coolant 4 is given a propulsive force when it flows through the through hole 63.

  A conductor insertion hole 67 into which the rotor bar 71 is inserted is formed on the outer side in the radial direction than the through hole 63. The conductor insertion hole 67 communicates with both end faces 6a and 6b of the rotor core 6, but extends parallel to the core center line P1. For this reason, unlike the conductor insertion hole 61 of the first embodiment, the conductor insertion hole 67 cannot obtain the propulsive force of the refrigerant by rotating the rotor.

  Due to the propulsive force of the refrigerant applied through the inclined through hole 63, the refrigerant flows in the conductor through hole 67 in the direction opposite to the through hole 63. However, it is also possible to incline the conductor insertion hole 67 of this embodiment in the circumferential direction. At this time, it may be inclined in the same direction with respect to the rotor rotation direction, or may be inclined in the opposite direction. Preferably, the flow direction of the refrigerant in the through hole 63 and the flow direction of the refrigerant 4 in the rotor-side gap 67s in the conductor insertion hole 67 are the same.

  When the conductor insertion hole 67 is inclined in the circumferential direction, when the rotor 5 is rotated clockwise when the end surface 6a on the paper surface of FIG. 19 is viewed from above the core center line P1, the conductor insertion hole 67 is set to one end surface opening 67a. It is good to incline to the right side (clockwise side) toward the other end surface 67b. As a result, as shown in FIG. 18, also in the rotor-side gap 67s in the conductor insertion hole 67, similarly to the through-hole 63, the propulsive force of the refrigerant from the other end face opening 67b to the one end face opening 67a is obtained. .

  As a modification, the through-hole 63 formed inside is inclined in the radial direction, but may be inclined in the circumferential direction instead. The conductor insertion hole 67 formed on the outer side may be inclined in the circumferential direction in the same direction as the through hole 63 formed on the inner side. In this case, regardless of the rotation direction of the rotor 5, the propulsive force of the refrigerant in the same direction is applied to both the rotor-side gap 67s in the conductor insertion hole 67 and the inner through-hole 63, and a large amount of refrigerant is It can be circulated in one direction.

  The conductor insertion hole 67 formed on the outer side does not open to the gap 10, but may be a conductor insertion groove having a side opening opening to the gap 10.

(Embodiment 5)
As shown in FIG. 20, in the rotating machine according to the present embodiment, the rotor 5 includes a rotor core 8 and a rotor-side superconducting coil 9.

  The rotor core 8 functions as an iron core constituting a magnetic circuit in combination with the stator core, and is made of a high magnetic permeability material. The rotor core 8 has a cylindrical shape, and teeth 81 and coil insertion grooves 82 are alternately arranged in the circumferential direction on the outer peripheral portion 8c. The coil insertion groove 82 communicates with both end faces 8 a and 8 b of the rotor core 8 and extends in a direction not parallel to the rotation shaft 51.

  The rotor-side superconducting coil 9 is formed by winding a tape-shaped superconducting wire into a racetrack (track and field) shape a plurality of times. The rotor-side superconducting coil 9 has a straight portion 91 in which a superconducting wire is extended in a straight shape, and a bent portion 92 in which the superconducting wire is bent in a circular arc shape. The straight portion 91 of the rotor-side superconducting coil 9 is inserted into the coil insertion groove 82. The bending portion 92 is constructed so as to straddle one tooth 81.

  The coil insertion groove 82 also serves as a groove through which the refrigerant flows. Between the straight portion 91 of the rotor-side superconducting coil 9 and the peripheral surface forming the coil insertion groove 82 and the virtual outer surface of the rotor core 8, the rotor side A gap 82s is formed. The rotor-side gap 82s communicates with both end faces 8a and 8b of the rotor core 8 in the axial direction.

  The position of the rotor-side gap 82s formed in the coil insertion groove 82 depends on the arrangement position of the rotor-side superconducting coil 9 in the coil insertion groove 82. For example, when the rotor-side superconducting coil 9 is disposed at a position close to the side opening 82c of the coil insertion groove 82 and the straight portions 91 of the adjacent rotor-side superconducting coils 9 are placed in contact with each other, A rotor-side gap 82s is formed on the radially inner side. As shown in FIG. 20, when the rotor-side superconducting coil 9 is arranged on the back side of the coil insertion groove 82, a rotor-side gap 82 r that opens on the surface of the outer peripheral portion 8 c of the rotor core 6 is formed on the radially outer side of the straight portion 91. It is formed.

  The rotor-side gaps 82s and 82r communicate with both end faces 8a and 8b of the rotor core 8 regardless of whether they are formed on the radially inner side and / or the radially outer side of the straight portion 91. The plurality of coil insertion grooves 82 formed in the rotor 5 extend in parallel to each other and are inclined at a predetermined inclination angle θ in the circumferential direction of the rotor 5.

  The rotor-side gap 82r shown in FIG. 20 has a side opening 82c that opens to the outer peripheral portion 8c of the rotor core 8, and thus communicates with the gap. For this reason, the refrigerant | coolant which distribute | circulates a gap receives the driving force of the refrigerant | coolant which distribute | circulates the rotor side clearance gap 82r, and distribute | circulates in the same direction as the rotor side clearance gap 82r.

  When the rotor-side superconducting coil 9 is disposed in the rotor core 8, the rotor core 8 functions as a field rotor that causes a current to flow through the rotor-side superconducting coil 9 to generate a strong magnetic field. The coil insertion groove 82 of the outer peripheral portion 8c of the rotor core 8 is formed with a predetermined inclination angle θ in the circumferential direction. Similarly, since the field has an inclination in the circumferential direction, the motor performance is improved, for example, generation of abnormal torque is suppressed.

  Further, when the rotor 5 rotates, a viscous force acts on the opening end faces 82a and 82b of the coil insertion grooves 82 on both end faces 8a and 8b of the rotor core 8 due to the difference in the speed of the refrigerant. A component parallel to the coil insertion groove 82 causes a refrigerant flow in one direction of the coil insertion groove 82. Since the refrigerant flows in one direction also in the rotor 5, it can be cooled to a stable temperature as in the stator.

  In addition, due to the driving force of the refrigerant in the rotor 5, the refrigerant flows stably in the direction opposite to the rotor 5 in the superconducting stator. Therefore, heat generated in the superconducting coil on the stator side can be efficiently removed without being retained in the slot, and the superconducting coil on the stator side can be cooled to a stable temperature.

  In the case of a liquid refrigerant, bubbles of the refrigerant generated in the slot can be discharged to the outside of the slot.

  Also in the present embodiment, as in the first embodiment, protrusions or recesses are provided on the peripheral edges of the end surface openings 82a and 82b of the coil insertion grooves 82 of the end surfaces 8a and 8b of the rotor core 8 so that the refrigerant is easily introduced into the through holes. May be.

  You may form a through-hole in the radial direction inner side rather than the teeth 81 of the rotor core 8 of Embodiment 4, and / or the teeth 81. FIG. The through hole may be inclined in the same direction as the coil insertion groove 82 in the circumferential direction. Further, the through hole may be inclined in the radial direction with respect to the rotation axis. Others are the same as in the fourth embodiment.

  In the first to fifth embodiments, the rotor has a squirrel-cage conductor or a rotor-side superconducting coil. However, a superconducting rotor having a superconducting material such as a superconducting bulk other than the cage conductor or the rotor-side superconducting coil may be used in combination or instead. In this case, the superconducting bulk is cooled to the superconducting critical temperature Tc or lower by the refrigerant, and a high torque can be generated by capturing a strong magnetic field or shielding the magnetic field.

  Further, a normal rotor using normal copper or aluminum, a permanent magnet rotor incorporating a permanent magnet that does not cause low temperature demagnetization, or the like may be used. In this case, cooling reduces the electrical resistance of the normal conductive material or increases the magnetic force of the permanent magnet, thereby improving the performance and efficiency of the rotating machine.

  1: Superconducting stator, 10: Gap, 11: Stator core, 12: Slot, 12s: Stator side clearance, 13: Teeth, 2: Superconducting coil, 21, Straight part, 22: Curved part, 26: Partition member, 27 : Yoke, 4: refrigerant, 5: rotor, 6: rotor core, 60: protrusion, 61, 67: conductor insertion hole, 61a, 61b: end face opening, 61s, 62s, 62r, 67s, 82r: rotor side clearance, 62 : Conductor insertion groove, 62a, 62b: end face opening, 62c: side face opening, 63, 65: through hole, 63a, 63b, 65a, 65b: end face opening, 66, 68: groove, 66a, 66b: end face opening, 66c: Side opening, 67: Conductor through hole, 69: Recess, 7: Superconducting coil, 8: Rotor core, 81: Teeth, 82: Coil insertion groove, 83: Groove, 83a, 83b: End face opening, 8 c: side opening, 9: rotor side superconducting coil.

Claims (14)

A superconducting rotating machine constituting a motor or a generator,
A superconducting stator comprising a cylindrical stator core having a slot extending between both end faces, and a superconducting coil housed in the slot and formed by winding a superconducting wire;
A rotor provided rotatably with respect to the superconducting stator, and having a central axis of the superconducting stator and a rotation axis arranged coaxially;
The superconducting stator and the rotor are both arranged in a common refrigerant,
Between the peripheral surface forming the slot and the superconducting coil, there is a stator side gap communicating with both axial end surfaces of the stator core,
The rotor is to have a through hole and / or groove extending in a direction inclined with respect to and the rotation axis communicates both end faces in the axial direction of said rotor,
The through hole or / and groove of the rotor is formed with an inclination in one circumferential direction with respect to the rotation axis of the rotor,
In the opening peripheral edge portion of the through hole or / and groove at the end surface in the axial direction of the rotor, the circumferential direction in which the angle between the extending direction of the through hole or / and groove and the end surface in the axial direction of the rotor is large Having one side portion and the other side portion in the circumferential direction in which the angle of the rotor outer side between the extending direction of the through hole or / and the groove and the end surface in the axial direction of the rotor is smaller than the one side portion;
The superconducting rotating machine in which the one side portion of the peripheral edge of the opening is relatively higher in the rotation axis direction than the other side portion . A superconducting rotating machine constituting a motor or a generator,
A superconducting stator comprising a cylindrical stator core having a slot extending between both end faces, and a superconducting coil housed in the slot and formed by winding a superconducting wire;
A rotor provided rotatably with respect to the superconducting stator, and having a central axis of the superconducting stator and a rotation axis arranged coaxially;
The superconducting stator and the rotor are both arranged in a common refrigerant,
Between the peripheral surface forming the slot and the superconducting coil, there is a stator side gap communicating with both axial end surfaces of the stator core,
The rotor is to have a through hole and / or groove extending in a direction inclined with respect to and the rotation axis communicates both end faces in the axial direction of said rotor,
The superconducting rotating machine in which the through hole of the rotor is formed with an inclination in one radial direction with respect to the rotation axis of the rotor . A superconducting rotating machine constituting a motor or a generator,
A superconducting stator comprising a cylindrical stator core having a slot extending between both end faces, and a superconducting coil housed in the slot and formed by winding a superconducting wire;
A rotor provided rotatably with respect to the superconducting stator, and having a central axis of the superconducting stator and a rotation axis arranged coaxially;
The superconducting stator and the rotor are both arranged in a common refrigerant,
Between the peripheral surface forming the slot and the superconducting coil, there is a stator side gap communicating with both axial end surfaces of the stator core,
The rotor is to have a through hole and / or groove extending in a direction inclined with respect to and the rotation axis communicates both end faces in the axial direction of said rotor,
The rotor comprises a cylindrical rotor core in which a plurality of conductor insertion holes or / and conductor insertion grooves are formed in the vicinity of the outer periphery, and a cage conductor made of a superconducting material,
The cage conductor is composed of end rings arranged at both ends in the axial direction of the rotor core, and a plurality of rotor bars that electrically connect the end rings at both ends,
The rotor bar is inserted into the conductor insertion hole or / and the conductor insertion groove,
The conductor insertion hole is the through hole, and between the circumferential surface forming the conductor insertion hole and the rotor bar, there is a rotor-side gap that communicates both end faces in the axial direction of the rotor,
The groove is open to the outer peripheral surface of the rotor core, and is formed with the same inclination as the conductor insertion hole with respect to the rotation axis of the rotor . A superconducting rotating machine constituting a motor or a generator,
A superconducting stator comprising a cylindrical stator core having a slot extending between both end faces, and a superconducting coil housed in the slot and formed by winding a superconducting wire;
A rotor provided rotatably with respect to the superconducting stator, and having a central axis of the superconducting stator and a rotation axis arranged coaxially;
The superconducting stator and the rotor are both arranged in a common refrigerant,
Between the peripheral surface forming the slot and the superconducting coil, there is a stator side gap communicating with both axial end surfaces of the stator core,
The rotor is to have a through hole and / or groove extending in a direction inclined with respect to and the rotation axis communicates both end faces in the axial direction of said rotor,
The rotor comprises a cylindrical rotor core in which a plurality of conductor insertion holes or / and conductor insertion grooves are formed in the vicinity of the outer periphery, and a cage conductor made of a superconducting material,
The cage conductor is composed of end rings arranged at both ends in the axial direction of the rotor core, and a plurality of rotor bars that electrically connect the end rings at both ends,
The rotor bar is inserted into the conductor insertion hole or / and the conductor insertion groove,
The conductor insertion groove is the groove, and the conductor insertion groove opens on the outer peripheral surface of the rotor core, and is formed between the peripheral surface forming the conductor insertion groove and the outer peripheral virtual surface of the rotor core, and the rotor bar. A superconducting rotating machine having a rotor-side clearance communicating with both axial end faces of the rotor . A superconducting rotating machine constituting a motor or a generator,
A superconducting stator comprising a cylindrical stator core having a slot extending between both end faces, and a superconducting coil housed in the slot and formed by winding a superconducting wire;
A rotor provided rotatably with respect to the superconducting stator, and having a central axis of the superconducting stator and a rotation axis arranged coaxially;
The superconducting stator and the rotor are both arranged in a common refrigerant,
Between the peripheral surface forming the slot and the superconducting coil, there is a stator side gap communicating with both axial end surfaces of the stator core,
The rotor is to have a through hole and / or groove extending in a direction inclined with respect to and the rotation axis communicates both end faces in the axial direction of said rotor,
The rotor is accommodated in the coil insertion groove, and a cylindrical rotor core having coil insertion grooves formed in the vicinity of the outer periphery thereof, which communicate with both axial end faces of the rotor and extend in a direction inclined with respect to the rotation axis. Rotor side superconducting coil,
The coil insertion groove is the groove, and the axial end surfaces of the rotor are communicated between the rotor-side superconducting coil, the peripheral surface forming the coil insertion groove, and the outer peripheral virtual surface of the rotor core. A superconducting rotating machine having a rotor-side clearance . A superconducting rotating machine constituting a motor or a generator,
A superconducting stator comprising a cylindrical stator core having a slot extending between both end faces, and a superconducting coil housed in the slot and formed by winding a superconducting wire;
A rotor provided rotatably with respect to the superconducting stator, and having a central axis of the superconducting stator and a rotation axis arranged coaxially;
The superconducting stator and the rotor are both arranged in a common refrigerant,
Between the peripheral surface forming the slot and the superconducting coil, there is a stator side gap communicating with both axial end surfaces of the stator core,
The rotor is to have a through hole and / or groove extending in a direction inclined with respect to and the rotation axis communicates both end faces in the axial direction of said rotor,
A superconducting rotating machine in which the sum of the radial sectional areas of the stator-side gaps of the plurality of slots formed in the superconducting stator is larger than the radial sectional area of the gap between the superconducting stator and the rotor . 3. The superconducting rotating machine according to claim 2 , wherein the through hole and / or groove of the rotor is formed with an inclination in one circumferential direction with respect to the rotation axis of the rotor. Oite to claim 1, wherein the through hole of the rotor, the superconducting rotating machine is formed with an inclination in one direction radially relative to the rotational axis of the rotor. Oite to claim 1, wherein the rotor is provided with a rotor core of cylindrical shape conductor insertion hole and / or the conductor insertion grooves are formed with a plurality of near the outer circumference, and a cage conductor made of a superconducting material,
The cage conductor is composed of end rings arranged at both ends in the axial direction of the rotor core, and a plurality of rotor bars that electrically connect the end rings at both ends,
The rotor bar is a superconducting rotating machine inserted through the conductor insertion hole or / and the conductor insertion groove. 4. The superconducting rotating machine according to claim 3 , wherein the groove is located at the same angle as the conductor insertion hole with respect to the circumferential direction of the rotation shaft of the rotor. Oite to claim 1, wherein the rotor includes a rotor core of cylindrical shape coil insertion groove extending in a direction inclined with respect to and the rotation axis communicates both end faces in the axial direction of the rotor is formed in the vicinity of the outer peripheral portion, A rotor-side superconducting coil housed in the coil insertion groove,
The coil insertion groove is the groove, and the axial end surfaces of the rotor are communicated between the rotor-side superconducting coil, the peripheral surface forming the coil insertion groove, and the outer peripheral virtual surface of the rotor core. A superconducting rotating machine having a rotor-side clearance. The side opening of the slot opened to the inner peripheral surface of the stator core according to any one of claims 1 to 6 , wherein a gap formed between the superconducting stator and the rotor is between the slot and the slot. A superconducting rotating machine in which a partition member for partitioning is disposed. The sum of the radial cross-sectional areas of the stator-side gaps of the plurality of slots formed in the superconducting stator according to any one of claims 1 to 5 is a diameter of a gap between the superconducting stator and the rotor. A superconducting rotating machine with a larger cross-sectional area. In any 1 paragraph of Claims 1-6 , when the above-mentioned rotor rotates, in the above-mentioned rotor, in the above-mentioned rotor, the above-mentioned refrigerant passes through the above-mentioned penetration hole or / and groove, and the other side from the end face of the axis of the above-mentioned rotor A superconducting rotating machine that circulates and circulates through the stator-side gap in a direction opposite to the direction of the rotor in the superconducting stator.

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