JP2011120468A - Superconducting apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a superconducting apparatus that prevents the temperature of a superconducting coil from locally rising and is advantageous in properly maintaining the output of a motor, even if heat infiltration or increase in the disturbance and output load, or the like occur. <P>SOLUTION: The superconducting apparatus 1 includes a superconducting coil 22 that generates a magnetic field; a magnetic permeable yoke 21 which the magnetic field generated by the superconducting coil 22 transmits; and a thermal conductive unit 33, that is cooled to a state of ultra-low temperature by a low-temperature section and cools the magnetic permeable yoke, by making thermal contact with the magnetic permeable yoke 21. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a superconducting device such as a superconducting motor device having a magnetically permeable yoke through which a magnetic flux formed by a superconducting member is transmitted.

  2. Description of the Related Art Conventionally, a superconducting motor device having a superconducting coil that generates magnetic flux by power feeding and a vacuum container that forms a vacuum heat insulating chamber that accommodates the superconducting coil has been provided as a superconducting device (Patent Document 1). The superconducting motor device has a superconducting coil that generates a magnetic field when power is supplied, and a magnetically permeable yoke that transmits magnetic flux of the magnetic field formed by the superconducting coil.

JP 2007-89345 A

  According to the superconducting motor device described above, heat intrusion into the superconducting coil may suddenly occur depending on actual use conditions. In this case, the temperature of the superconducting coil may be locally increased. In this case, the output of the superconducting motor device may be impaired.

  The present invention has been made in view of the above circumstances, and even if heat intrusion occurs, disturbance occurs, or even if the output load of the superconducting motor device increases, superconductivity An object of the present invention is to provide a superconducting device that is advantageous in suppressing the risk of the temperature of a member being locally raised and maintaining good output.

A superconducting device according to the present invention includes a superconducting member that generates a magnetic field when power is supplied, a magnetically permeable yoke that transmits magnetic flux of the magnetic field formed by the superconducting member, and an outer peripheral portion of the permeable yoke that is cooled to a low temperature state by a low-temperature part. And a heat conducting part having a cooling cylinder part that is in thermal contact with the outer peripheral part of the permeable yoke and cools the permeable yoke. It has a larger linear expansion coefficient than the material constituting the magnetic yoke .

  The permeable yoke is disposed in the vicinity of the superconducting member so as to transmit the magnetic flux of the magnetic field formed by the superconducting member. The heat conduction part is cooled to a low temperature state by the low temperature part. Thus, the heat conduction part cooled to a low temperature state is in thermal contact with the magnetic permeable yoke to cool the magnetic permeable yoke. When the permeable yoke is cooled, the temperature of the superconducting member disposed in thermal contact with the permeable yoke is well maintained at a low temperature, and the superconducting state of the superconducting member is well maintained.

  As described above, according to the present invention, the heat conducting portion cooled to a low temperature state is in thermal contact with the permeable yoke to cool the permeable yoke. When the permeable yoke is cooled, the temperature of the superconducting member disposed in thermal contact with the permeable yoke is maintained at a low temperature. For this reason, even if heat intrusion occurs in the superconducting member, or even if the output load of the superconducting device increases, or even if a disturbance occurs, the superconducting member is maintained at a low temperature state, The temperature rise of the superconducting member is suppressed, and the superconducting state of the superconducting member is well maintained.

According to the present invention, the cooling cylinder portion of the heat conducting portion coaxially covers the outer peripheral portion of the permeable yoke and thermally contacts the outer peripheral portion of the permeable yoke to cool the permeable yoke. The material constituting the heat conducting portion has a larger linear expansion coefficient than the material constituting the permeable yoke. The linear expansion coefficient corresponds to the heat shrinkage rate. Here, when the superconducting device is used, the heat conducting unit, the magnetically permeable yoke, and the superconducting member are maintained at a low temperature. For this reason, when the superconducting device is used, the heat shrinkage amount that the cooling cylinder portion of the heat conducting portion thermally shrinks in the radial direction thereof is δ33, and the heat shrinkage amount that the magnetically permeable yoke thermally shrinks in the radial direction is δ21. Then, δ33 is larger than δ21 (δ33> δ21). For this reason, when the superconducting device is used, the cooling cylinder portion of the heat conducting portion is thermally contracted in the radially inward direction, so that the magnetically permeable yoke can be tightly fitted, and as a result, can be brought into close contact with the outer peripheral portion of the permeable yoke. Thereby, the advantage which can improve the heat conductivity in the boundary of the cooling cylinder part of a heat conductive part and the outer peripheral part of a magnetic permeability yoke is acquired.

1 is a cross-sectional view illustrating a superconducting motor device according to Embodiment 1. FIG. It is sectional drawing which concerns on Example 1 and shows the superconducting motor apparatus cut | disconnected along the axial center. It is sectional drawing which concerns on Example 2 and shows the teeth part vicinity of a fixed iron core. It is sectional drawing which concerns on Example 3 and shows the teeth part vicinity of a fixed iron core. It is sectional drawing which concerns on Example 4 and shows the superconducting motor apparatus cut | disconnected along the axial center. FIG. 10 is a partial cross-sectional view illustrating a superconducting motor device according to a fifth embodiment. FIG. 10 is a partial cross-sectional view illustrating a superconducting motor device according to a sixth embodiment.

  The superconducting member generates a magnetic field along with the power supply, and may have any shape and structure. Furthermore, in order to maintain the superconducting state of the superconducting member, it is preferable to provide a low temperature part for maintaining the superconducting member below its critical temperature. The low temperature part is for maintaining the superconducting member at a low temperature in order to maintain the superconducting state of the superconducting member. The low temperature is preferably a very low temperature. Cryogenic temperature can be below the temperature range which can maintain the superconducting state of a superconducting member. Therefore, the temperature range in the cryogenic state differs depending on the critical temperature or composition of the superconducting material body constituting the superconducting member. Practically, the cryogenic state is preferably below the liquefaction temperature of nitrogen gas (77 K). However, the cryogenic state may be 100K or less and 150K or less depending on the composition of the superconducting member. The low temperature part may have a structure including a refrigerator, or may be a heat transfer mechanism for transferring the low temperature from the refrigerator to the superconducting member side, or a cryogenic part without a refrigerator. A mechanism that adiabaticly holds a refrigerant (for example, liquefied helium, liquefied nitrogen, or liquefied oxygen) may be used.

  The magnetically permeable yoke transmits the magnetic flux of the magnetic field formed by the superconducting member, and is formed of a magnetically permeable material that easily transmits the magnetic flux. Examples of the magnetically permeable material include pure iron, silicon steel, ferrite rich cast iron, and ferrite rich cast steel.

  According to one aspect of the present invention, it is preferable that the magnetically permeable yoke has a cylindrical shape around its axis, and the heat conducting portion is in thermal contact with the outer peripheral portion of the permeable yoke. In this case, since the outer peripheral portion of the magnetically permeable yoke has a larger radius than the inner peripheral portion of the permeable yoke, a thermal contact area between the heat conducting portion and the outer peripheral portion of the permeable yoke is ensured.

According to one aspect of the present invention, it is preferable that the material constituting the heat conducting portion has a larger linear expansion coefficient than the material constituting the permeable yoke. In this case, it is preferable that the heat conducting portion surrounds the permeable yoke. In this case, as the state of the superconducting device is transferred in use from the time of assembly, the heat shrinkage of the heat-conducting portion is secured, it is possible to heat transfer guide portion is an interference fit of magnetically permeable yoke. Here, the linear expansion coefficient corresponds to the linear expansion coefficient between the normal temperature and the superconducting member. The linear expansion coefficient corresponds to the thermal contraction rate.

  According to one aspect of the present invention, the magnetically permeable yoke has a plurality of teeth portions arranged in parallel at intervals in the circumferential direction thereof. In this case, it is preferable that the heat conductive material for teeth arrange | positioned between the teeth part and the superconducting member is provided. The heat conductive material for teeth is based on a heat conductive material having a higher thermal conductivity than the material of the permeable yoke. The heat conductive material for teeth has a function of cooling the superconducting member via the teeth portion of the magnetically permeable yoke. The superconducting member is satisfactorily cooled by the heat conductive material for teeth.

  According to one aspect of the present invention, it is preferable that the heat conducting portion and the heat conducting material for teeth are connected to each other. In this case, when the heat conducting part is cooled by the low temperature part, the heat conducting material for teeth is cooled, the tooth part of the magnetically permeable yoke is cooled, and consequently the superconducting member is cooled.

  According to one aspect of the present invention, the superconducting device preferably constitutes a superconducting motor device. In this case, it is preferable that an opposing member is provided which faces a portion of the magnetically permeable yoke other than the contact portion where the heat conducting portion is in thermal contact and faces the motor reaction force. When the superconducting motor device operates, the facing member can receive the motor reaction force opposite to the motor reaction force. According to one aspect of the present invention, both the heat conducting portion and the opposing member can contact the outer peripheral portion of the permeable yoke. Assuming that the contact area between the heat conducting portion and the permeable yoke is SA and the contact area between the opposing member and the permeable yoke is SB, SA = SB, SA≈SB, or SA> SB, SA <SB may be satisfied. . If SA> SB, the magnetically permeable yoke is easily cooled by the heat conducting portion. If SA <SB, the contact area SB between the opposing member and the magnetically permeable yoke is large, which is advantageous for receiving the motor reaction force.

  The present embodiment is applied to a superconducting motor device as an example of a magnetic field generator that is a typical example of a superconducting device. FIG. 1 shows a superconducting motor device 1 according to this example. The superconducting motor device 1 can be used for in-vehicle use, stationary use, industrial use, and the like, and includes a superconducting motor 2 that functions as a magnetic field generation unit, a cryogenic generation unit 3 that functions as a low temperature unit, a container 4, a current And an introduction terminal 5.

  Here, the superconducting motor 2 forms a motor that supplies three-phase alternating currents having phases different from each other by 120 degrees. The superconducting motor 2 includes a cylindrical stator 20 that makes a round around the axis P <b> 1 thereof, and a rotor 27 that functions as a movable element that can rotate with respect to the stator 20. The rotor 27 includes a rotating shaft 28 that is rotatably supported around the axis P1 of the superconducting motor 2, and a plurality of permanent magnets arranged on the outer peripheral portion of the rotating shaft 28 at intervals in the circumferential direction thereof. Part 29. The permanent magnet portion 29 can be formed of a known permanent magnet.

  The stator 20 functions as a superconducting member that is wound and held around a cylindrical fixed iron core 21 made of a material having high magnetic permeability that functions as a magnetically permeable yoke, and a tooth portion 210 that constitutes the fixed iron core 21. And a superconducting coil 22. A plurality of teeth 210 are arranged at equal intervals in the radial direction. In FIG. 1, in the superconducting coil 22, the coil wire 22 x and the coil wire 22 y sandwiching the tooth portion 210 flow currents in opposite directions.

  The inner end of the tooth portion 210 is in contact with the third container 45, but may be non-contact. The superconducting coil 22 is divided into three so that a three-phase alternating current can be passed. Superconducting coil 22 is made of a known superconducting material. The superconducting coil 22 is disposed in a throttle groove 21 a formed in the inner peripheral portion of the fixed iron core 21. When a three-phase alternating current flows through the superconducting coil 22, a rotating magnetic field that rotates around the stator 20, that is, around the axis P1 is generated. The rotor 27 is rotated around its axis P1 by the rotating magnetic field, and a motor function is obtained.

  The cryogenic temperature generator 3 maintains the superconducting coil 22 at a cryogenic temperature in order to maintain the superconducting state of the superconducting coil 22. The cryogenic temperature region obtained by the cryogenic generator 3 is selected according to the material of the superconducting material constituting the superconducting coil 22, but can be below the helium liquefaction temperature or below the nitrogen liquefaction temperature. It can be 150K, in particular 1-100K, 1-80K. However, it is not limited to these depending on the material of the superconducting material. The cryogenic temperature generation unit 3 includes a refrigerator 30 that generates an extremely low temperature in the cold head 32. Examples of the refrigerator 30 include known refrigerators such as a pulse tube refrigerator, a Stirling refrigerator, a Gifod McMahon refrigerator, a Solvay refrigerator, a Villemeier refrigerator, and the like.

  A heat conducting portion 33 is provided that uses a heat transfer material as a base material that connects the cold head 32 of the refrigerator 30 and the fixed iron core 21 of the stator 20 of the superconducting motor 2 so as to allow heat transfer. The heat conducting unit 33 has a head 33 h that is cooled to a low temperature by the cold head 32. The heat conducting portion 33 is formed of a material having high heat conductivity (for example, copper alloy, aluminum, aluminum alloy) or the like.

As shown in FIG. 1, the container 4 has a container shape, and forms a vacuum heat insulating chamber 40 that functions as a vacuum heat insulating chamber that functions as a heat insulating chamber for insulating the superconducting coil 22. A vacuum means that it is the pressure reduction state of the grade which can maintain sufficient heat insulation, for example, can be 10 < ^-1 > Pa or less. The vacuum heat insulating chamber 40 of the container 4 is an outer vacuum heat insulating chamber 41 (for example, surrounding the outer peripheral side (outside) of the superconducting coil 22 wound around the stator 20 together with the outer peripheral side (outer side) of the stator 20. 10 ⁻¹ Pa or less, 10 ⁻² Pa or less) and an inner vacuum heat insulation chamber 42 (pressure: 10 ⁻¹ ) surrounding the inner peripheral side (inner side) of the superconducting coil 22 together with the inner peripheral side (inner side) of the stator 20. Pa or less, 10 ⁻² Pa or less). The vacuum heat insulation chamber 40 is maintained in a high vacuum state (a state where the pressure is reduced from the atmospheric pressure) at the time of shipment, but it is preferable that the vacuum heat insulation chamber 40 be maintained in a high vacuum state for a long time by maintenance or the like.

  In this case, since the superconducting coil 22 is surrounded by the outer vacuum heat insulating chamber 41 and the inner vacuum heat insulating chamber 42, the superconducting coil 22 is maintained in an extremely low temperature state, and thus the superconducting state is maintained. As shown in FIG. 1, the outer vacuum heat insulating chamber 41 includes a first heat insulating chamber portion 41 a that surrounds the outer peripheral portion of the stator 20, and a second outer portion that surrounds the outside of the head portion 33 h and the cold head 32 of the heat conducting portion 33. And a heat insulating chamber portion 41c. The second heat insulating chamber portion 41c surrounds the heat conducting section 33 and the cold head 32, and maintains these low temperatures. As shown in FIG. 1, the container 4 includes a first container 43, a second container 44, a third container 45, and a fourth container 46 that are arranged coaxially from the outside to the inside. The first container 43 and the second container 44 face each other in the radial direction of the fixed iron core 21 so as to form the outer vacuum heat insulation chamber 41. The third container 45 and the fourth container 46 face each other in the radial direction of the fixed iron core 21 so as to form the inner vacuum heat insulation chamber 42.

  A rotor 27 is rotatably disposed in a cylindrical space 47 defined by the fourth container 46. The space 47 communicates with the atmosphere. The rotor 27 is connected to a rotary operating body. In addition, when the superconducting motor device 1 is mounted on a vehicle such as an automobile, the rotary operating body is exemplified by a traveling wheel or the like. Therefore, when the rotor 27 rotates, the wheel can rotate.

  As shown in FIG. 1, the first container 43 guides a cylindrical first surrounding portion 431 that surrounds the outer periphery of the superconducting motor 2 and a three-phase current introduction line 56 that feeds the superconducting coil 22. A cylindrical guide part 433 forming the chamber 432, a second surrounding part 434 so as to cover the cold head 32 and the heat conduction part 33, and a flange 30c of the compression mechanism 30a for compressing the refrigerant gas of the refrigerator 30 are attached. Mounting flange portion 435. As shown in FIG. 1, the guide portion 433 protrudes from the first surrounding portion 431 that surrounds the superconducting motor 2 in the first container 43. In addition, although the outer side of the 1st container 43 can be open | released to air | atmosphere, it is not limited to this. The outside of the first container 43 may be covered with a heat insulating material.

  As a material constituting the first container 43, it is preferable that the leakage magnetic flux is not transmitted or is difficult to transmit and has strength. Examples of such a material include non-magnetic metal materials having a low magnetic permeability (for example, alloy steel such as austenitic stainless steel). As a material constituting the second container 44, the third container 45, and the fourth container 46, a material having a high electric resistance is preferable in order to suppress an eddy current based on a change in magnetic flux. Examples of such materials include resins, reinforcing material reinforced resins, ceramics, and the like. Examples of the reinforcing material of the reinforcing material-reinforced resin include inorganic substances such as glass and ceramics. The reinforcing material is preferably a reinforcing fiber, and examples thereof include inorganic fibers such as glass fibers and ceramic fibers. The resin may be either a thermosetting resin or a thermoplastic resin.

  As shown in FIG. 1, a fixed plate 70 serving as a first holding portion is fixed to the distal end portion of a cylindrical guide portion 433 projecting partially from the first container 43. The stationary platen 70 is preferably formed of a material that is electrically and thermally highly insulating and / or a material that is difficult to transmit magnetic flux. For example, resin, fiber reinforced resin, and ceramics are illustrated. Depending on the case, a non-magnetic metal material having a low magnetic permeability may be used. In this case, it is preferable to employ an electrical insulation structure. Since the guide chamber 432 communicates with the outer vacuum heat insulation chamber 41, the superconducting motor 2 is driven to be in a vacuum heat insulation state (reduced pressure heat insulation state), and can exhibit a heat insulation function. Easy to maintain.

  As shown in FIG. 1, a plurality (three) of current introduction terminals 5 are electrically connected to the superconducting coil 22 via a current introduction wire 56, and a conductive material that supplies power to the superconducting coil 22 is used as a base material. It is a terminal to do. The current introduction terminal 5 has a protruding portion 85, and is held in a fixed state on the stationary platen 70 at the distal end portion of the guide portion 433 of the first container 43.

  The structure for fixing the current introduction terminal 5 to the stationary platen 70 is not particularly limited. Specifically, according to the present embodiment, the current introduction terminal 5 is inserted substantially coaxially through the through hole formed in the fixed platen 70. Between the inner wall surface of the through hole and the outer wall surface of the current introduction terminal 5, a sealing material that enhances airtightness is interposed. As a result, the guide chamber 432 is sealed against the atmosphere outside the container 4, and the high vacuum state (depressurized state) of the guide chamber 432 is maintained. As shown in FIG. 1, the guide chamber 432 accommodates the other end side of the current introduction terminal 5. One end side of the current introduction terminal 5 is exposed from the guide chamber 432. The material for forming the current introduction terminal 5 is not particularly limited as long as it is a conductive material, and examples thereof include copper, copper alloy, aluminum, aluminum alloy, iron, iron alloy, silver, and silver alloy. It is not limited, and what is necessary is just to have conductivity.

  When the superconducting motor 2 is driven, when a switch (not shown) is turned on, three-phase alternating current is supplied to the current introduction terminal 5 connected to an external power source. As a result, power is supplied to the superconducting coil 22. As a result, a rotating magnetic field is generated around the axis P1 in the superconducting motor 2, and the rotor 27 rotates around the axis P1. Thereby, the superconducting motor 2 is driven. Here, the magnetic flux passes through the third container 45, the inner vacuum heat insulation chamber 42, and the fourth container 46, causes the permanent magnet portion 29 of the rotor 27 to be attracted and repelled, and the rotor 27 rotates.

  Thus, when the superconducting motor 2 is rotationally driven, the superconducting coil 22 and the fixed iron core 21 are well maintained in the cryogenic state due to the cryogenic temperature generated by the cryogenic temperature generating unit 3. Therefore, the superconducting coil 22 is well maintained below the critical temperature, and the superconducting motor 2 is driven to rotate well. Since the electric resistance of the superconducting coil 22 is 0 or extremely low, the output of the superconducting motor 20 is high. According to this embodiment, the space 47 formed on the inner peripheral surface of the fourth container 46 communicates with the atmosphere. For this reason, the fourth container 46 is on the higher temperature side than the third container 45.

  FIG. 2 shows a cross section along the axis P1 of the superconducting motor 2. As shown in FIG. 2, the first container 43 functions as a housing of the superelectric motor device 1, and includes a cylindrical portion 43 m that extends coaxially along the axis P <b> 1 and the axial length of the cylindrical portion 43 m. The first lid portion 43r having high rigidity for supporting the one end portion 43e in the direction and the second lid portion 43s having high rigidity for supporting the other end portion 43f in the axial length direction of the cylindrical portion 43m are provided.

  As shown in FIG. 2, the first lid portion 43 r supports the one end portion 46 e of the fourth container 46 in the axial length direction. The second lid portion 43 s supports the other end portion 46 f of the fourth container 46 in the axial length direction. A first bearing 28h is interposed between the first lid 43r and the rotary shaft 28. A second bearing 28k is interposed between the second lid portion 43s and the rotary shaft 28. The rotary shaft 28 is supported by the first bearing 28h and the second bearing 28k so as to be rotatable around the axis P1.

  As shown in FIG. 2, the heat conducting portion 33 includes a cylindrical cooling tube portion 33k centering on the axis P1. The cylindrical portion 33k of the heat conducting portion 33 is connected to the above-described head portion 33h (see FIG. 1). As shown in FIG. 2, the cooling cylinder portion 33k of the heat conducting portion 33 is provided coaxially with the outer peripheral portion 21p of the fixed iron core 21, and surrounds the outer peripheral portion 21p while being in thermal contact with the outer peripheral portion 21p. is doing. Here, the axial length of the fixed iron core 21 is indicated as LW. The cooling cylinder portion 33k of the heat conducting portion 33 surrounds the intermediate portion 21m in the axial length direction of the fixed iron core 21 while being in thermal contact therewith. Thereby, when the cooling cylinder part 33k of the heat conducting part 33 is cooled to a cryogenic state, the outer peripheral part 21p of the fixed iron core 21 is cooled, and the whole fixed iron core 21 is cooled. The intermediate portion 21m corresponds to a portion excluding the one end 21e and the other end 21f in the axial length direction of the fixed iron core 21.

  As shown in FIG. 2, one end 44e of the second container 44 is supported by the first lid 43r. The other end 44f of the second container 44 is supported by the second lid 43s. Therefore, the second container 44 is supported by the first container 43 (base body) of the container 4 with high support strength. The opposing portion 44r of the second container 44 having such a high support strength is in contact with the one end portion 21e of the fixed iron core 21 in the axial length direction. Further, the facing portion 44p of the second container 44 is in contact with the other end portion 21f in the axial length direction of the fixed iron core 21 while facing the other end portion 21f. As a result, the facing portion 44 r supports the one end 21 e of the fixed iron core 21. The facing portion 44p supports the other end portion 21f of the fixed iron core 21. The opposing portions 44r and 44p are provided in a ring shape around the axis P1.

  Here, in FIG. 2, the size of the opposing portions 44r and 44p of the second container 44 is shown as ΔL1. For this reason, when the superconducting motor 2 is driven to rotate, the opposing portions 44r and 44p of the second container 44 support the outer peripheral portion 21p of the fixed iron core 20 even when the motor reaction force acts on the fixed iron core 21. Can do. In particular, since the opposing portions 44r and 44p correspond to both ends of the fixed core 21 in the axial length direction, the support for the fixed core 21 can be improved satisfactorily. Thus, the opposing portions 44r and 44p can function as a motor reaction force opposing member that opposes the motor reaction force.

  Here, the second container 44 is formed using a non-metallic material such as a resin, a reinforcing material reinforced resin, or ceramics as a base material. Therefore, the thermal conductivity of the second container 44 is lower than the thermal conductivity of the heat conducting portion 33 using a metal (for example, copper, aluminum, copper alloy, aluminum alloy) as a base material. For this reason, the penetration of heat from the second container 44 to the fixed iron core 21 through the first lid part 43r and the second lid part 43s of the first container 43 is suppressed as much as possible.

  As shown in FIG. 2, an outer vacuum heat insulating chamber 41 is formed between the cooling cylinder 33 k (second container 44) and the first container 43 of the heat conducting unit 33. For this reason, heat entry from the first container 43 to the cooling cylinder part 33k (second container 44) of the heat conducting part 33 is suppressed. As a result, the heat intrusion to the fixed iron core 21 and the superconducting coil 22 through the cooling cylinder portion 33k of the heat conducting portion 33 is suppressed.

  According to the present embodiment, as shown in FIG. 2, the third container 45 has a cylindrical portion 45 w extending along the axis P <b> 1 and an end 45 e in the axial length direction of the cylindrical portion 45 w in a radially outward direction. It has the 1st flange 45x provided in a row, and the 2nd flange 45y provided in the radial direction at the other end 45f of the axial direction of the cylinder part 45w. The outer periphery of the first flange 45x and the outer periphery of the second flange 45y are supported to face the second container 44.

  The second container 44 and the third container 45 form a heat insulating chamber 10 w that forms part of the vacuum heat insulating chamber 10. The heat insulation chamber 10w accommodates the fixed iron core 21 and the superconducting coil 22.

  As shown in FIG. 2, the inner vacuum heat insulation chamber 42 includes a cylindrical intermediate chamber 42m, a ring-shaped first end chamber 42x communicating with one end in the axial length direction of the intermediate chamber 42m, and an axial length of the intermediate chamber 42m. And a ring-shaped second end chamber 42y communicating with the other end in the direction. The first end chamber 42x surrounds the one end portion 21e in the axial length direction of the fixed iron core 21 and the one end portion 22e in the axial length direction of the superconducting coil 22 via the heat insulating chamber 10w, thereby performing vacuum insulation. The second end chamber 42y surrounds the other end portion 21f in the axial length direction of the fixed iron core 21 and the other end portion 22f in the axial length direction of the superconducting coil 22 via the heat insulating chamber 10w, thereby performing vacuum insulation. Thereby, it can contribute to maintaining the fixed iron core 21 and the superconducting coil 22 in a cryogenic state.

  As described above, according to the present embodiment, the fixed iron core 21 functioning as a magnetically permeable yoke is disposed in the vicinity of the superconducting coil 22 so as to transmit the magnetic flux formed by the superconducting coil 22. The cooling cylinder portion 33k of the heat conducting portion 33 is cooled to a cryogenic state by the cold head 32 of the cryogenic temperature generating portion 3. In this way, the cooling cylinder portion 33 k of the heat conducting portion 33 that is cooled to an extremely low temperature state is in thermal contact with the outer peripheral portion 21 p of the fixed iron core 21 to cool the fixed iron core 21. When the fixed iron core 21 is thus cooled, the temperature of the superconducting coil 22 arranged in the vicinity of the fixed iron core 21 is maintained at a low temperature. For this reason, even if heat intrusion occurs on the superconducting coil 22 side, or even when the refrigeration output of the refrigerator 30 cannot catch up due to a disturbance or a sudden increase in motor load, a large cooling capacity The fixed iron core 21 having the above maintains the superconducting coil 22 in a low temperature state. For this reason, the temperature rise of the superconducting coil 22 is suppressed, and the superconducting state of the superconducting coil 22 is well maintained.

  In particular, the cooling cylinder part 33k of the heat conduction part 33 is in thermal contact with the outer peripheral part 21p having a large radius in the fixed iron core 21, so that the cooling cylinder part 33k of the heat conduction part 33 and the outer peripheral part 21p of the fixed iron core 21 are This is advantageous in cooling the fixed iron core 21. Here, the volume of the fixed iron core 21 is larger than that of the superconducting coil 22, and the cold storage amount of the fixed iron core 21 is large.

  Thus, in the present embodiment, the superconducting coil 22 is not directly cooled, but the fixed iron core 21 that is adjacent to the superconducting coil 22 and has a larger heat capacity than the superconducting coil 22 is actively cooled by the heat conducting portion 33. I will let you. For this reason, even if the temperature rises locally in the superconducting coil 22, the superconducting coil 22 can be quickly cooled by the cold heat of the fixed core 21.

  Furthermore, according to the present embodiment, the material (for example, copper, aluminum, copper alloy, aluminum alloy) constituting the heat conducting portion 33 has a larger linear expansion than the material (for example, iron-based material) constituting the fixed iron core 21. It has a coefficient (corresponding to the heat shrinkage rate). In this case, when the cooling cylinder part 33k of the heat conducting part 33 surrounds the fixed core 21 coaxially, the amount of heat shrinkage in the radial direction of the cooling cylinder part 33k of the heat conducting part 33 is ensured.

Here, the assembly of the superconducting motor device 1 is generally not performed in a cryogenic state but in a temperature region higher than the cryogenic state, for example, a room temperature region. On the other hand, when the superconducting motor device 1 is used, the heat conducting unit 33, the fixed iron core 21, and the superconducting coil 22 are maintained in a cryogenic state. For this reason, when the superconducting motor device 1 is used, the heat shrinkage amount in which the cooling cylinder portion 33k of the heat conducting portion 33 thermally shrinks in the radial direction is δ33, and the heat shrinkage amount in which the fixed iron core 21 is thermally contracted in the radial direction is δ21. Then, δ33 is larger than δ21 (δ33> δ21). Therefore when using the conductive motor device 1, the cooling cylinder portion 33k of the heat transfer guide portion 33 is heat shrunk radially inward direction, can interference fit the stator core 21, thus, brought into close contact with the outer peripheral portion 21p of the stator core 21 be able to. Thereby increasing the thermal conductivity at the boundary between the outer peripheral portion 21p of the cooling cylinder portion 33k and the fixed iron core 21 of the heat transfer guide unit 33.

  In addition, according to the present embodiment, the material constituting the cooling cylinder portion 33k of the heat conducting portion 33 is a nonmagnetic material or a paramagnetic material, such as copper, aluminum, a copper alloy, an aluminum alloy, and an iron-based material. It is not a ferromagnetic material. In this case, the magnetic flux passing through the fixed iron core 21 can be prevented from leaking outward from the outer peripheral portion 21p of the fixed iron core 21.

  When the superconducting motor device 1 is rotationally driven, a motor reaction force is generated as the rotor 27 rotates. Here, a structure in which the motor reaction force is positively received by the cooling cylinder portion 33k of the heat conducting portion 33 is also conceivable. However, in this case, it is necessary to increase the support strength of the heat conduction part 33 with respect to the cooling cylinder part 33k, and a structure in which the cooling container part 33k of the heat conduction part 33 is positively supported by the first container 43 functioning as a housing is required. Is done. In this case, a structure in which the contact area between the first container 43 near the normal temperature side and the cooling cylinder portion 33k of the heat conducting portion 33 in the cryogenic state is likely to be increased. This may cause the cold heat of the cooling cylinder portion 33k of the heat conducting portion 33 to escape to the first container 43 side. In this case, considering the low temperature maintenance of the cooling cylinder portion 33k of the heat conducting portion 33 and the low temperature maintenance of the stationary iron core 21 and the superconducting coil 22, this is not preferable.

  In this regard, according to the present embodiment, as shown in FIG. 2, the opposing portions 44 r and 44 p of the second container 44 functioning as an opposing member are the cooling cylinders of the heat conducting portion 33 in the outer peripheral portion 21 p of the fixed iron core 21. The portion 33k is opposed to the one end 21e and the other end 21f, which are portions other than the contact portion in thermal contact. As a result, the opposed portions 44r and 44p of the second container 44 are opposed to the outer peripheral portion 21p of the fixed iron core 21, are opposed to the motor reaction force, and can receive the motor reaction force. Thus, according to the present embodiment, it is intended that the motor reaction force is positively received not by the cooling cylinder portion 33k of the heat conducting portion 33 but by the opposed portions 44r and 44p of the second container 44 functioning as a facing member. ing. Since the second container 44 is supported by the first lid portion 43r and the second lid portion 43s of the first container 43 functioning as a housing, the facing portions 44r and 44p can favorably face the motor reaction force.

  SA> SB, where SA is the contact area between the cooling cylinder portion 33k of the heat conducting section 33 and the fixed iron core 21, and SB is the contact area between the second container 44 and the fixed iron core 21, which are opposing members. For this reason, it is easy to cool the fixed iron core 21 by the cooling cylinder portion 33 k of the heat conducting portion 33. In some cases, SA <SB may be satisfied. Since the contact area SB between the second container 44 as the opposing member and the fixed iron core 21 is large, it is advantageous for the second container 44 to receive the motor reaction force. Note that SA = SB and SA≈SB may be used as necessary.

  FIG. 3 shows a second embodiment. Since the present embodiment basically has the same configuration and operational effects as the first embodiment, FIGS. 1 and 2 are applied mutatis mutandis. As shown in FIG. 3, the fixed iron core 21 has a plurality of teeth portions 210 arranged side by side in the circumferential direction with a space therebetween. The teeth part 210 protrudes in the radial inner direction. Between the teeth part 210 and the superconducting coil 22, a heat conductive material 330 for teeth is provided. The heat conductive material 330 for teeth cools the superconducting coil 22 via the teeth portion 210 of the fixed iron core 21, and has a higher heat conductivity than the material of the fixed iron core 21 (for example, copper, aluminum, etc.). , Copper alloy, aluminum alloy).

  The thermal conductive material 330 for teeth is in contact with the side surface 210s of the tooth portion 210 of the fixed iron core 21. The heat conductive material 330 for teeth is cooled by the tooth portion 210 of the fixed iron core 21 and eventually cools the superconducting coil 22. In the tooth portion 210, the magnetic flux Ma (see FIG. 3) is transmitted in the radial direction of the fixed iron core 21. For this reason, the heat conductive material 330 for teeth is oriented along the magnetic flux Ma that passes through the tooth portion 210, and the transmission of the magnetic flux Ma is prevented from being prevented, and the output of the superconducting motor 2 is favorably maintained. .

  FIG. 4 shows a third embodiment. Since this embodiment basically has the same configuration and effects as the first and second embodiments, FIGS. 1 and 2 are applied mutatis mutandis. As shown in FIG. 4, the heat conductive material 330 for the teeth is connected to the heat conductive portion 33 that surrounds the outer peripheral portion 21 p of the fixed core 21 via the continuous portion 333, and is integrated with the heat conductive portion 33. It is said that. Therefore, when the heat conducting section 33 is cooled to a low temperature by the cold head 32 of the cryogenic temperature generating section 3, the teeth heat conducting material 330 is also quickly cooled to a low temperature, and the superconducting coil 22 is easily cooled. Thereby, the output of the superconducting motor 2 is maintained well. The continuous portion 333 is disposed on the end portions 21e, 21f side (see FIG. 2) of the fixed core 21 in the axial length direction.

  FIG. 5 shows a fourth embodiment. Since this embodiment basically has the same configuration and effects as the first and second embodiments, FIG. 1 is applied mutatis mutandis. As shown in FIG. 5, the facing portions 44 r and 44 p of the second container 44 that function as a facing member are opposed to the one end 21 e and the other end 21 f of the outer peripheral portion 21 p of the fixed core 21. As a result, the second container 44 faces the outer peripheral portion 21p of the fixed iron core 21, faces the motor reaction force, and can receive the motor reaction force. Thus, it is intended that the motor reaction force is positively received not by the heat conducting portion 33 but by the facing portions 44r and 44p of the second container 44 that functions as a facing member. Further, a reinforcing member 445 extending in the radial direction is interposed between the second container 44 and the first container 43. Thereby, even when the motor reaction force is large, the motor reaction force can be received even better. The reinforcing member 445 is disposed on the outer peripheral side of the opposed portions 44r and 44p, and supports the opposed portions 44r and 44p.

  FIG. 6 shows a fifth embodiment. Since this embodiment basically has the same configuration and effects as the first and second embodiments, FIG. 2 is applied mutatis mutandis. As shown in FIG. 6, an intermediate heat transfer mechanism 600 having a U shape in cross section is provided between the cold head 32 on the refrigerator 30 side and the heat conducting unit 33. One end portion of the intermediate heat transfer mechanism 600 is fixed to the head portion 33h of the heat conducting portion 33 with a screw 507 via an intermediate member 508. The other end of the intermediate heat transfer mechanism 600 is fixed to the cold head 32 with a screw 509 via an intermediate member 508. The intermediate material 508 has a high thermal conductivity and is formed of a soft material (for example, indium or an indium alloy) so as to improve the thermal contact property. The intermediate heat transfer mechanism 600 is formed of a laminated plate 602 obtained by laminating metal plates 601 made of a metal having high thermal conductivity (for example, copper, aluminum, copper alloy, aluminum alloy). The cold heat from the cold head 32 is transmitted to the head portion 33 h of the heat conducting portion 33 through the intermediate heat transfer mechanism 600. Since the intermediate heat transfer mechanism 600 is U-shaped in cross section, it has not only thermal conductivity but also excellent vibration absorption. This is advantageous for suppressing vibration propagation between the superconducting motor 2 and the refrigerator 30.

  FIG. 7 shows a sixth embodiment. Since this embodiment basically has the same configuration and effects as the first and second embodiments, FIG. 2 is applied mutatis mutandis. As shown in FIG. 7, an intermediate heat transfer mechanism 700, which is an assembly of metal mesh wires, is provided between the cold head 32 on the refrigerator 30 side and the heat conducting unit 33. The intermediate heat transfer mechanism 700 includes a metal mesh wire assembly 701 and metal mesh wire assembly 701 having flanges 702 and 703 joined by welding, brazing, soldering, caulking, screwing, or the like. The flange 702 is fixed to the head portion 33 k of the heat conducting portion 33 with a screw 708. The flange 703 is fixed to the cold head 32 with a screw 709. The aggregate 701 is formed of a net of metal (for example, copper, aluminum, copper alloy, aluminum alloy) having high thermal conductivity. The flanges 702 and 703 may be fixed to the heat conducting portion 33 and the cold head 32 by welding, brazing, or soldering. Since the aggregate 701 is an aggregate of metal mesh wires, it is excellent not only in thermal conductivity but also in vibration absorption. This is advantageous for suppressing vibration propagation between the superconducting motor 2 and the refrigerator 30.

  According to the first embodiment described above, the rotor 27 is disposed on the outer peripheral portion of the rotary shaft 28 with a spacing in the circumferential direction thereof, which is supported rotatably around the axis P1. A plurality of permanent magnet portions 29. However, the present invention is not limited thereto, and the permanent magnet portion may be provided on the stator 20 side, and the superconducting coil 22 may be provided on the rotor 27 side. According to the above-described embodiment, the present invention is applied to the in-vehicle superconducting motor device 1, but the present invention is not limited to in-vehicle use but may be stationary. According to the above-described embodiment, since the superconducting motor device 1 is a rotary type, the movable element is the rotor 27. However, a linear motion type linear motor that linearly moves the movable element may be used. In this case, the stator 20 has a shape extending in one direction, and generates a movable magnetic field that moves the mover linearly.

  According to the above-described embodiment, the rotor 27 has the permanent magnet portion 29, and the stator 20 has the fixed iron core 21 and the superconducting coil 22 wound around the fixed iron core 21. It is not limited to. The stator may have a permanent magnet portion and the rotor may have a superconducting coil. In the first embodiment, the fixed iron core 21 has a cylindrical shape, but a plurality of divided bodies divided in the circumferential direction may be assembled in the circumferential direction to form a cylindrical body.

  Structures and functions specific to one embodiment can be applied to other embodiments. For example, the structures of the second to seventh embodiments may be applied to the first embodiment. In addition, the present invention is not limited to the above-described embodiments and examples, and can be implemented with appropriate modifications within a range not departing from the gist.

The following technical idea can also be grasped from the above description.
[Additional Item 1] A superconducting member that generates a magnetic field in response to power feeding, a magnetically permeable yoke that has a tooth portion and transmits magnetic flux of the magnetic field formed by the superconducting member, and a tooth that is disposed between the tooth portion and the superconducting member. The heat conductive material for teeth has a higher thermal conductivity than the material of the magnetically permeable yoke so as to cool the superconducting member via the teeth portion of the magnetically permeable yoke. A superconducting device comprising a material as a base material. A teeth part is cooled and a superconducting member is cooled.
[Additional Item 2] A superconducting member that generates a magnetic field in response to power supply, a magnetically permeable yoke that transmits magnetic flux of the magnetic field formed by the superconducting member, and is cooled to a low temperature state by a low-temperature portion, and is thermally coupled to the permeable yoke. A superconducting device comprising: a heat conducting part that contacts and cools the magnetically permeable yoke.

  The present invention can be used for superconducting devices such as industrial, in-vehicle, and medical superconducting motor devices.

  1 is a superconducting motor device (superconducting device), 2 is a superconducting motor, 20 is a stator, 21 is a stationary iron core (magnetically permeable yoke), 210 is a teeth portion, 22 is a superconducting coil (superconducting member), and 27 is a rotor (movable) Child), 3 is a cryogenic temperature generation part (low temperature part), 30 is a refrigerator, 32 is a cold head, 33 is a heat conduction part, 33h is a head part, 33k is a cooling cylinder part, 330 is a heat conduction material for teeth, 333 Is a connecting portion, 4 is a container, 41 is an outer vacuum heat insulating chamber, 42 is an inner vacuum heat insulating chamber, 43 is a first container, 44 is a second container (opposing member), 45 is a third container, and 46 is a fourth container. , 41 indicates an outer vacuum heat insulating chamber, and 42 indicates an inner vacuum heat insulating chamber.

Claims (6)

A superconducting member that generates a magnetic field with power supply;
A magnetically permeable yoke through which magnetic flux formed by the superconducting member is transmitted;
A superconducting device comprising: a heat conducting portion that is cooled to a low temperature state by a low temperature portion and that is in thermal contact with the magnetic permeable yoke to cool the magnetic permeable yoke.   2. The superconductivity according to claim 1, wherein the magnetically permeable yoke has a cylindrical shape around an axis of the permeable yoke, and the heat conducting portion is in thermal contact with an outer peripheral portion of the permeable yoke. apparatus.   3. The superconducting device according to claim 1, wherein the material constituting the heat conducting portion has a larger linear expansion coefficient than the material constituting the magnetically permeable yoke. In one of Claims 1-3, the said permeable yoke has the several teeth part arranged in parallel at intervals in the circumferential direction of this,
A thermal conductive material for teeth disposed between the teeth portion and the superconducting member is provided, and the thermal conductive material for teeth has a higher thermal conductivity than the material of the permeable yoke. The superconducting device is characterized in that the superconducting member is cooled through a tooth portion of the magnetically permeable yoke.   5. The superconducting device according to claim 4, wherein the heat conducting part and the heat conducting material for teeth are connected to each other.   6. The superconducting device according to claim 1, wherein the superconducting device constitutes a superconducting motor device, and a portion of the magnetically permeable yoke other than a contact portion where the heat conducting portion is in thermal contact. A superconducting device having a facing member facing the motor reaction force as well as facing.

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