JP5866965B2 - Superconducting rotating electrical machine stator - Google Patents

Description

  The present invention relates to a superconducting rotating electrical machine stator. Examples of the rotating electrical machine include a motor and a generator.

Patent Document 1 discloses a multiphase motor having a stator, an armature provided on the stator, and a rotor. According to this, the armature includes a plurality of superconducting coils formed integrally by winding a tape-shaped superconducting wire in a spiral shape while laminating the long sides of the cross section. Here, a plurality of adjacent superconducting coils are arranged so as to partially overlap each other in the circumferential direction of the stator.
Patent Document 2 discloses a racetrack type superconducting coil having a wound body formed by winding a superconducting wire around a coil center line and a lead wire led out from the wound body. According to this, the terminal of the outermost superconducting wire of the wound body is drawn outward from one end of the wound body. A connection terminal for connecting a lead wire is attached to the terminal of the superconducting coil. A lead wire is connected to the connection terminal, thereby electrically connecting the superconducting coils that are electrically in phase.

JP 2005-176582 JP JP 2009-49033 A

  Patent Document 1 discloses that a superconducting coil is disposed in a stator. However, Patent Document 1 does not mention a structure in which a superconducting coil is actually electrically connected to a stator. Patent Document 2 discloses a method of attaching a connection terminal to a coil. However, when this is used for a stator of a rotating electric machine such as a motor, how to specifically arrange the connection terminal is mentioned. It has not been. As described above, according to Patent Documents 1 and 2, a specific structure is not mentioned to fix the connection terminal connecting the superconducting coils in a space-saving manner.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a superconducting rotating electrical machine stator having a structure that is advantageous for fixing a connection terminal connecting superconducting coils in a space-saving manner.

  (1) A superconducting rotating electrical machine stator according to the present invention according to aspect 1 includes: (i) a cylindrical stator core formed around a core center line; (ii) a case covering an outer periphery of the stator core; ) A plurality of coils are arranged on the inner circumference side of the stator core along the circumferential direction, and have a wound body formed by winding a superconducting wire around the coil center line and a lead wire led out from the wound body. A superconducting coil; and (iv) a plurality of connecting terminals formed of a conductive material fixed in an electrically insulated state to the stator core or case and connecting the superconducting coils to each other, and (v) each connecting terminal is a stator core The connection terminals are electrically connected to the lead wires of the superconducting coil, respectively, from the outer peripheral side of the stator core to the inner peripheral side of the stator core.

  Each connection terminal extends in the radial direction of the stator from the outer peripheral side of the stator core to the inner peripheral side of the stator core. Thus, the connection terminal is not extended along the axial length direction of the stator. For this reason, when the superconducting coils are electrically connected to each other via the connection terminal, the dimension in the axial length direction is suppressed. As a result, the dimension of the stator in the axial direction is suppressed.

  (2) According to the superconducting rotating electrical machine stator according to the present invention relating to aspect 2, in the above aspect, the connection terminal is fixed to the stator core or the shaft end face side of the case via an electrical insulator. Electrical insulation of the connection terminals is ensured. Any electrical insulator may be used as long as it has high electrical insulation. Also in this aspect, since the connection terminal is not extended along the axial length direction of the stator, the dimension of the stator in the axial length direction is suppressed.

  (3) According to the superconducting rotating electrical machine stator according to the present invention relating to aspect 3, in the above aspect, the connection terminal includes an insertion hole for inserting and holding the lead wire of the superconducting coil. The lead wire of the superconducting coil is inserted and held in the insertion hole at the inner end of the stator core among the connection terminals, and the position fluctuation of the lead wire is suppressed. For this reason, each connection terminal is electrically connected to the lead wire of the superconducting coil. The lead wire of the superconducting coil may be press-fitted into the insertion hole and fixed, or may be coupled to the connection terminal with a coupling material in a state where the lead wire is inserted into the insertion hole. Examples of the binding material include a solder material, a welding material, and an organic or inorganic conductive binder. In the cross section perpendicular to the direction in which the lead wire extends, it is preferable that the lead wire of the superconducting coil has a flat shape.

  (4) According to the superconducting rotating electrical machine stator according to the present invention relating to aspect 4, in the above aspect, (i) the lead wire is a first lead wire protruding from the winding body of the superconducting coil in the axial length direction of the stator core, and The first lead wire and the second lead wire are oriented so as to approach each other in the radial direction of the stator core, and (ii) the insertion hole is one superconducting coil. A first insertion hole into which the first lead wire is inserted, and a second insertion hole into which the second lead wire of one superconducting coil is inserted, and (iii) the first insertion hole is one superconductivity. The first lead wire of the coil is oriented in substantially the same direction, and the second insertion hole is oriented in substantially the same direction as the second lead wire of one superconducting coil. The first lead wire of one superconducting coil is inserted into the first insertion hole and supported. The second lead wire of one superconducting coil is inserted into the second insertion hole and supported.

  (5) According to the superconducting rotating electrical machine stator according to the present invention relating to aspect 5, in the above aspect, (i) the lead wire is a first lead wire protruding from the winding body of the superconducting coil in the axial length direction of the stator core, and The first lead wire and the second lead wire are substantially parallel to each other, and (ii) the insertion hole is a first lead into which the first lead wire of one superconducting coil is inserted. An insertion hole and a second insertion hole into which the second lead wire of one superconducting coil is inserted, and the first insertion hole is oriented in substantially the same direction as the first lead wire of one superconducting coil. The second insertion hole is oriented in substantially the same direction as the second lead wire of one superconducting coil. The first lead wire of one superconducting coil is inserted into the first insertion hole and supported. The second lead wire of one superconducting coil is inserted into the second insertion hole and supported.

  (6) According to the superconducting rotating electrical machine stator according to the present invention relating to aspect 6, in the above aspect, the first lead wire and the second lead wire are in the same direction from the winding body of the superconducting coil in the axial length direction of the stator core. The connection terminal has a first connection terminal having a first insertion hole for inserting the first lead wire of the superconducting coil and a second connection having a second insertion hole for inserting the second lead wire of the superconducting coil. The first connection terminal and the second connection terminal are disposed on the same side in the axial length direction of the stator core.

  Thus, the connection terminal is not extended long along the axial length direction of the stator core. For this reason, when the superconducting coils are electrically connected to each other via the connection terminal, the dimension in the axial length direction is suppressed. As a result, it is advantageous to reduce the size of the stator in the axial direction.

  Further, according to this aspect, the first connection terminal and the second connection terminal are disposed on the same side in the axial direction of the stator core. For this reason, wiring can be connected to both the first connection terminal and the second connection terminal from the same side in the axial direction of the stator core. In this sense, it is advantageous for wiring work.

  (7) According to the superconducting rotating electrical machine stator according to the present invention relating to aspect 7, in the above aspect, (i) the first lead wire and the second lead wire are separated from the winding body of the superconducting coil in the axial length direction of the stator core. (Ii) the connection terminal includes a first connection terminal having a first insertion hole for inserting the first lead wire of the superconducting coil, and a second insertion for inserting the second lead wire of the superconducting coil. And (iii) the first connection terminal and the second connection terminal are arranged on opposite sides in the axial direction of the stator core.

  Thus, the connection terminal is not extended long along the axial length direction of the stator core. For this reason, the dimension of the stator in the axial direction is suppressed, which is advantageous in reducing the dimension of the stator in the axial direction.

  Further, according to this aspect, the first connection terminal and the second connection terminal are arranged on different sides in the axial length direction of the stator core. For this reason, the first connection terminal is arranged on one end side in the axial direction of the stator core, but the second connection terminal is not arranged. Therefore, the distance between the first connection terminals adjacent in the circumferential direction on the one end side is increased, and in this sense, the connection workability is improved. Thus, since the space | interval of the adjacent 1st connection terminals is increased, even if it is a time when an applied voltage is high, the discharge in the 1st connection terminals provided adjacently is suppressed. Furthermore, since the space | interval of the 1st connection terminals adjacently provided in the circumferential direction is increased, the thickness of the 1st connection terminal in the circumferential direction can be increased, and a conductive area can be increased.

  Moreover, although the 2nd connection terminal is arrange | positioned at the other end side in the axial length direction of a stator core, the 1st connection terminal is not arrange | positioned. Accordingly, on the other end side, the interval between the second connection terminals adjacent in the circumferential direction is increased, and in this sense, the connection workability is improved. Since the distance between the adjacent second connection terminals is increased in this manner, even when the applied voltage is high, the discharge between the adjacent second connection terminals is suppressed. Furthermore, since the space | interval of the 2nd connection terminals adjacently provided in the circumferential direction is increased, the thickness of the 2nd connection terminal in the circumferential direction can be increased, and a conductive area can be increased.

  (8) According to the superconducting rotating electrical machine stator according to the present invention relating to aspect 8, in the above aspect, the connection terminals are arranged in parallel in the circumferential direction of the stator core, the first connection terminal, the second connection terminal, and the third connection. Two superconducting coils adjacent to each other in the circumferential direction are connected to each other via a third connection terminal, and in-phase current is passed to the superconducting coils adjacent to each other in the circumferential direction via the third connection terminal. Is energized.

  According to this aspect, a third connection terminal is provided in addition to the first connection terminal and the second connection terminal. As described above, since the third connection terminal for directly joining the two superconducting coils adjacent to each other is provided on the stator core, the connection work can be simplified and the effect of reducing the connection resistance can be obtained.

  According to the superconducting rotating electrical machine stator according to the present invention, each connection terminal extends from the outer peripheral side of the stator core to the inner peripheral side of the stator core, and does not extend long in the axial direction, but in the axial direction. Can be miniaturized. Each connection terminal is electrically connected to the lead wire of the superconducting coil. For this reason, when the superconducting coils are electrically connected to each other via the connection terminal, the dimension in the axial length direction is suppressed. Thus, the superconducting rotating electrical machine stator according to the present invention has a structure that is advantageous for fixing the connection terminals connecting the superconducting coils in a space-saving manner.

FIG. 4 is a cross-sectional view taken along the core center line of the stator according to the first embodiment. FIG. 6 is an end view projected from a direction substantially parallel to the core center line of the stator core. It is an end elevation which shows the principal part of the state which assembled | attached the several connection terminal to the stator core. It is an end elevation which shows the principal part of the state which assembled | attached the several connection terminal and the superconducting coil to the stator core. It is a perspective view which shows the state fixed with the 1st lead wire and 2nd lead wire of a superconducting coil inserted in the slit of a connection terminal. It is sectional drawing of a superconducting coil. 6 is a cross-sectional view of a superconducting coil according to Embodiment 2. FIG. FIG. 10 is a cross-sectional view of a superconducting coil according to the third embodiment. FIG. 6 is a cross-sectional view taken along a core center line of a stator according to the fourth embodiment. FIG. 10 is an end view according to the fourth embodiment, projected from a direction substantially parallel to the core center line of the stator core. FIG. 10 is a diagram illustrating a state in which a plurality of superconducting coils are inserted into slots of a stator core according to the fourth embodiment. It is a figure which concerns on Embodiment 4 and shows the state which assembled | attached the superconducting coil, the 1st connection terminal, and the 2nd connection terminal to the stator core. FIG. 10 is a perspective view of a superconducting coil according to Embodiment 4 and having a first lead wire and a second lead wire. FIG. 10 is a perspective view of a superconducting coil according to Embodiment 5 and having a first lead wire and a second lead wire. FIG. 10 is a cross-sectional view taken along the core center line of the stator according to the fifth embodiment. It is a figure which concerns on Embodiment 5 and shows the state fixed in the state which inserted the 1st lead wire of the superconducting coil in the 1st slit of the 1st connection terminal. It is a figure which concerns on Embodiment 5 and shows the state fixed in the state which inserted the 2nd lead wire of the superconducting coil in the 2nd slit of the 2nd connection terminal. FIG. 18 is a diagram illustrating a state in which the first connection terminal, the second connection terminal, and the third connection terminal are fixed to the shaft end surface side of the stator core according to the sixth embodiment.

  Hereinafter, embodiments of the present invention will be specifically described.

(Embodiment 1)
The rotating electrical machine according to this embodiment is a superconducting motor for vehicle mounting, industrial use, home use and the like. The superconducting motor includes a stator 1 that functions as a stator having a rotor chamber 1r, and a rotor (not shown) that functions as a rotor accommodated in the rotor chamber 1r. Although not shown, the rotor includes a rotor bar made of a superconducting wire, a superconducting lead-type winding composed of an end ring, an iron core, and a rotating shaft. The rotation axis is along the core center line P1 and rotates around the core center line P1. 1 and 2 show a stator 1 (superconducting rotating electrical machine stator). FIG. 1 shows a cross-sectional view taken along the core center line P1 extending linearly of the stator core 2 so as to include the core center line P1. FIG. 2 shows an end view projected from a direction substantially parallel to the core center line P1 of the stator core 2 (the direction of the arrow PA in FIG. 1). The core center line P1 extends along the horizontal direction, but may extend along the vertical direction.

  As shown in FIG. 1, the stator 1 includes a stator core 2 having a core center line P <b> 1, a case 3, a superconducting coil 4, and a plurality of connection terminals 5. The stator core 2 has a cylindrical shape formed around the core center line P1, and is made of a material having high magnetic permeability (for example, iron-based). The stator core 2 has a cylindrical outer peripheral surface 20 and ring-shaped shaft end surfaces 21 and 22.

  FIG. 3 shows a main part in a state where the plurality of connection terminals 5 are assembled to the stator core 2. As shown in FIG. 3, a plurality of slots 24 and teeth 25 are alternately arranged in the inner peripheral portion of the stator core 2 in the circumferential direction around the core center line P <b> 1 (arrow S direction). In FIG. 2, P11 and P12 indicate virtual lines along the radial direction with respect to the core center line P1. Specifically, P11 corresponds to the center line of the tooth 25. P 12 corresponds to the center line of the slot 24. As shown in FIG. 2, the plurality of slots 24 together with the center line P12 thereof, respectively, along the radial direction radiated from the core center line P1 toward the outer peripheral side, that is, along the centripetal direction toward the core center line P1. It is extended. Since the teeth 25 are also sandwiched between the slots 24, the same applies. Here, the radial direction and the centripetal direction correspond to the radial direction (arrow D direction) of the stator core 2. As shown in FIG. 1, the teeth 25 and the slots 24 extend along the axial length direction (the direction of the arrow L shown in FIG. 1) of the stator core 2 in a direction substantially parallel to the core center line P <b> 1. .

  The case 3 has a cylindrical shape that covers the outer periphery of the stator core 2 and is formed of a nonmagnetic material such as austenitic stainless steel or hard resin. As shown in FIG. 1, the case 3 is formed in a ring-shaped thin portion 30 formed in an end region in the axial length direction (arrow L direction) and a central region in the axial length direction (arrow L direction). And a thick portion 33 having a ring thickness T2. The thin portion 30 has ring-shaped shaft end faces 31 and 32. The thick portion 33 has ring-shaped shaft end faces 34 and 35.

  As shown in FIG. 1, the insulating portion 6 that functions as a terminal block having high electrical insulation is fixed to the shaft end surface 34 of the thick portion 33 of the case 3 by a plurality of fixtures 61. The fixture 61 has a shaft portion 61 a having a male screw 61 b and a head portion 61 c hidden by the insulating portion 6. The insulating portion 6 extends in a ring shape around the core center line P1 and is made of an electrically insulating material. The electrical insulating material may be anything as long as it has electrical insulating properties, and is formed of FRP reinforced with reinforcing fibers such as glass fibers, but may be a resin material or ceramics. As shown in FIG. 1, the insulating portion 6 has a ring shape that faces the outer circumferential surface 62 that faces the inner circumferential surface of the thin portion 30 of the case 3 and the rotor chamber 1 r on the core centerline P1 side. It has an inner peripheral surface 63, a ring-shaped sub-shaft end surface 64 that abuts on the shaft end surface 34 of the thick portion 33 of the case 3, and a ring-shaped inner portion 66 that protrudes radially inward.

  As shown in FIG. 1, the inner peripheral surface 63 of the insulating portion 6 has a first inner peripheral surface 63 f having the same diameter as the outer peripheral surface of the stator core 2 and an inner diameter smaller than the inner diameter of the inner peripheral surface of the stator core 2. A second inner peripheral surface 63s. As shown in FIG. 1, since the second inner peripheral surface 63 s of the inner portion 66 is close to the core center line P <b> 1 of the stator core 2, the contact area between the connection terminal 5 and the insulating portion 6 increases, Fixing can be further stabilized. However, the present invention is not limited to this, and the second inner peripheral surface 63s of the insulating portion 6 may have the same diameter as the first inner peripheral surface 63f.

  As shown in FIG. 2, a plurality of superconducting coils 4 are arranged side by side along the circumferential direction (arrow S direction) around the core center line P <b> 1 on the inner peripheral side of the stator core 2. Superconducting coil 4 has a length LA (see FIG. 2). A plurality (12) of superconducting coils 4 are arranged in parallel around the core center line P1 along the circumferential direction (arrow S direction) of the stator core 2 on the inner circumferential side of the stator core 2 as the outer circumferential side row S10. Further, as shown in FIG. 2, a plurality (12 pieces) of superconducting coils 4 are arranged in parallel along the circumferential direction (arrow S direction) of the stator core 2 as a row S <b> 20 on the inner circumferential side. In the circumferential direction of the stator core 2 (arrow S direction), the superconducting coil 4 (row S20) on the inner circumferential side and the superconducting coil 4 (row S10) on the outer circumferential side are arranged so as to overlap each other. In this case, when the superconducting coil 4 is energized and the superconducting coil 4 generates a rotating magnetic field, it can contribute to the improvement of the waveform of the rotating magnetic field moving in the circumferential direction (arrow S direction).

  As shown in FIG. 5, the superconducting coil 4 has a double pancake shape of a racetrack (track and field stadium) shape. The superconducting coil 4 is led out from the wound body 40 while being separated from the wound body 40 formed by winding the superconducting wire around the coil center line P2 in multiple loops at a distance WA (see FIG. 5). The first lead wire 41 and the second lead wire 42 are provided. The wound body 40 of the superconducting coil 4 includes a straight portion 40a (extending in the direction of the arrow L) in which the superconducting material is extended in a straight shape, and a bent portion in which the superconducting material is bent in a circular arc shape. 40c.

  The superconducting wire is formed by coating a superconducting material with a coating layer, and is particularly preferably formed of a high-temperature superconducting material. The superconducting wire has a tape shape, has a long side 43 and a short side 44 in cross section, and has a thin rectangular shape having a thickness T3 (see FIG. 5) for the reasons of manufacturing and improving the superconducting performance. There is no.

  As shown in FIG. 5, with respect to the superconducting coil 4, the first lead wire 41 and the second lead wire 42 are in the axial length direction (arrow L direction) of the stator core 2, that is, in a direction substantially parallel to the core center line P1. The superconducting coils 4 run in parallel while projecting from the wound body 40 in the same direction (the direction of the arrow L1 shown in FIG. 5). As can be understood from FIG. 4, the straight portion 40 a of the wound body 40 of the superconducting coil 4 is inserted into a single slot 24. Specifically, as can be understood from FIG. 4, the straight portions 40 a between the superconducting coils 4 adjacent in the circumferential direction (arrow S direction) are inserted into a single slot 24. Further, as shown in FIG. 4, the bent portion 40 c of the wound body 40 of the superconducting coil 4 is constructed so as to straddle the plurality of teeth 25 and the plurality of slots 24.

  As shown in FIG. 3, each connection terminal 5 extends from the outer peripheral side of the stator core 2 to the inner peripheral side of the stator core 2 along the radial direction of the stator core 2 (arrow D direction). That is, as shown in FIG. 3, each connection terminal 5 is arranged along the radial direction so as to go to the core center line P1. Thus, each connection terminal 5 is not extended along the axial length direction (arrow L direction in FIG. 1) of the stator core 2, but along the radial direction, that is, the radial direction of the stator core 2 (arrow D direction). ). For this reason, in the structure in which the superconducting coils 4 energized in the same phase (U phase, V phase, W phase) of the stator 1 are wired through the connection terminals 5, the dimension in the axial length direction (arrow L direction) is increased. It is suppressed. As a result, when the stator 1 is assembled and formed, it is advantageous for miniaturization in the axial length direction (arrow L direction).

  As shown in FIG. 2, when a plurality of connection terminals 5 are assembled to the stator core 2, the inner end 51 and the slit 58 of each connection terminal 5 are respectively in the radial direction of the stator core 2 (arrow D direction, core center). It arrange | positions in the radial direction along the radial direction (centrifugal direction) with respect to the line P1, and in other words, it arrange | positions so that it may mutually approach as it goes to a radial direction (arrow Di direction).

  Here, the connection terminal 5 is formed of a conductive material such as copper, and has a main body portion 50 and a flange-like flange portion 54 erected on the outer end of the main body portion 50 as shown in FIG. . The main body 50 has an inner end 51, an intermediate 52 and an outer end 53 in the direction of arrow D. The inner end portion 51 includes two side surfaces 51 s that face each other and approach each other in the circumferential direction (arrow S direction) of the stator core 2 and lead wires 41 and 42 of the superconducting coil 4 toward the innermost end in the arrow D direction. A slit 58 is provided as an insertion hole for insertion and holding. The slit 58 extends linearly from the inner end surface of the inner end portion 51 of the connection terminal 5 toward the outer end portion 53 in the arrow D direction (radial direction and centripetal direction with respect to the core center line P1). The intermediate part 52 has a fixing hole 55 as a fixing part for fixing the connection terminal 5 to the stator core 2. The fixing hole 55 may be a screw hole or may be a through hole. Furthermore, the fixing hole 55 is single, but may be plural.

  As can be understood from FIG. 5, the flange portion 54 has a wiring connection hole 56 that functions as a wiring connection portion that penetrates in the radial direction (arrow D direction, radial direction, centripetal direction) of the stator core 2. In the single connection terminal 5, the wiring connection hole 56 is single, but may be plural, and may be a screw hole or a through hole.

  As shown in FIG. 3, the wiring connection hole 56 is separated from the slit 58, and the wiring connection hole 56 is located on the outer end 53 side of the connection terminal 5, that is, on the outer peripheral side of the stator core 2. This facilitates the wiring work of connecting the connecting wire 57 (see FIG. 5) to the wiring connecting hole 56 of the connecting terminal 5 for wiring. When the motor is driven, the plurality of superconducting coils 4 are energized in the three-phase AC U phase, V phase, and W phase. That is, there are a superconducting coil 4 in which the U phase of the three-phase alternating current is energized, a superconducting coil 4 in which the V phase is energized, and a superconducting coil 4 in which the W phase is energized. The superconducting coils 4 to which the U phase is energized are electrically connected in series via the connection terminal 5 and the connection line 57 (see FIG. 5). The superconducting coils 4 through which the V phase is energized are electrically connected in series via the connection line 57. The superconducting coils 4 to which the W phase is energized are electrically connected in series via the connection line 57.

  As shown in FIG. 5, the slit 58 has an inner end opening 58 i located on the innermost side of the inner end portion 51 of the connection terminal 5, and a main opening 58 p that opens in the axial length direction (arrow L direction). In FIG. 3, the length LS of the slit 58 can occupy about 40 to 70% of the length LA of the connection terminal 5, but is not limited thereto. The slit width of the slit 58 is preferably set such that the thickness of the lead wires 41 and 42 can be inserted, for example. As shown in FIG. 5, lead wires 41 and 42 of the superconducting coil 4 are inserted and fixed in the slits 58 formed in the inner end portion 51 of the connection terminal 5. Specifically, as shown in FIG. 5, the first lead wire 41 of one superconducting coil 4 is inserted close to the outer end portion 58 m of the slit 58 of one connection terminal 5, It is firmly bonded with materials (solder material, welding material, conductive binder, etc.). Similarly, the second lead wire 42 of the superconducting coil 4 is inserted close to the inner end opening 58i of the slits 58 of the other adjacent connection terminals 5, and a bonding material (solder material, welding material, conductive binder, etc.) is inserted. ).

  The superconducting wire has a thin rectangular shape. The slit 58 allows the first lead wire 41 and the second lead wire 42 to be inserted. For this reason, the coupling area between the wall surface forming the slit 58 and the first lead wire 41 and the coupling area between the wall surface forming the slit 58 and the first lead wire 41 are increased to enhance the coupling force. Thereby, the connection resistance in the electrical resistance at the boundary between the connection terminal 5 and the first lead wire 41 can be reduced. Similarly, the connection resistance between the connection terminal 5 and the second lead wire 42 can be reduced.

  As shown in FIG. 5, the first lead wire 41 and the second lead wire 42 of one superconducting coil 4 are shifted from each other in the arrow D direction (the radial direction of the stator core 2) in the slit 58. The superconducting coil 4 is for coping with the double pancake shape. With such a structure, the first lead wire 41 and the second lead wire 42 of the same superconducting coil 4 are electrically connected to and coupled to different connection terminals 5 (see FIG. 5). The positions of the first lead line 41 and the second lead line 42 can be adjusted in the slit 58 in the direction in which the slit 58 extends (the direction of the arrow D).

  Further, as described above, as shown in FIG. 2, the plurality of slots 24 and the plurality of teeth 25 are respectively radial with respect to the core center line P <b> 1 of the stator core 2 (that is, the arrow D that is the radial direction of the stator core 2). Direction). Further, as shown in FIG. 2, the plurality of connection terminals 5, along with the slits 58, extend along the radial direction (that is, the arrow D direction that is the radial direction of the stator core 2) with respect to the core center line P <b> 1 of the stator core 2. Has been.

  According to the present embodiment, the slit 58 formed in the connection terminal 5 extends along the radial direction with respect to the core centerline P1 of the stator core 2 as can be understood from FIGS. Has been. The first lead wire 41 and the second lead wire 42 of the superconducting coil 4 are also inserted in the slit 58 of the connection terminal 5 in a state along the radial direction (that is, the arrow D direction that is the radial direction of the stator core 2). The first lead wire 41 and the second lead wire 42 of the superconducting coil 4 are also inserted into the slit 58 of the connection terminal 5 and fixed in the radial direction (that is, the arrow D direction that is the radial direction of the stator core 2). Has been.

  FIG. 6 shows a cross section showing the thickness of the wound body 40 constituting the superconducting coil 4 around which the superconducting wire is wound. In FIG. 6, for convenience, only the lead lines 41 and 42 are hatched. In FIG. 6, in the superconducting coil 4, straight portions 40a located on opposite sides of the wound body 40 via the coil center line P2 are inclined by an angle θ1 with respect to the coil center line P2. Accordingly, the straight portions 40a facing each other in the wound body 40 form a “C” shape with respect to the coil center line P2. That is, in the superconducting coil 4, the straight portions 40 a facing each other in the wound body 40 are inclined so as to approach the coil center line P <b> 2 toward the inner radial direction (Di direction) of the stator core 2. The structure shown in FIG. 6 corresponds to the case where the wound body 40 is wound while the superconducting wire is bent.

  Thus, since the first lead line 41 and the second lead line 42 forming the “C” shape are along the radial direction, they can be easily inserted into the slit 58 extending in the radial direction. For this reason, in the state where the first lead wire 41 and the second lead wire 42 are inserted into the slit 58, the stress load acting on the first lead wire 41 and the second lead wire 42 is reduced. Since the stress load is thus reduced, it is advantageous for maintaining the critical current density of the superconducting coil 4 at a high level.

  According to this embodiment, as shown in FIG. 1, each connection terminal 5 is fixed to the case 3 via the insulating portion 6. Specifically, the fixture 7 inserted into the fixing hole 55 of the connection terminal 5 is fastened to the inner side portion 66 of the insulating portion 6. Thus, each connection terminal 5 is attached to the ring-shaped shaft end surface 34 of the case 3 via the insulating portion 6. The flange 54 of the connection terminal 5 forms a gap 54 p (see FIG. 1) on the inner peripheral surface side of the thin portion 30 of the case 3.

  As shown in FIG. 1, the superconducting coil 4, the stator core 2, the connection terminal 5, and the insulating portion 6 do not protrude beyond the shaft end surfaces 31 and 32 of the thin portion 30 of the case 3 in the axial length direction (arrow L direction). It is arranged in and is made compact. The rotor chamber 1r of the stator 1 accommodates a cryogenic liquid-phase or vapor-phase refrigerant for cooling the superconducting coil 4 to a critical temperature or lower. Therefore, a cryogenic refrigerator is mounted near the motor. Examples of the refrigerant include liquid nitrogen, liquid air, and liquid helium.

  As described above, according to this embodiment, in FIGS. 2 and 3, which are end views projected from a direction substantially parallel to the core center line P <b> 1 of the stator core 2, each connection terminal 5 is an outer periphery of the stator core 2. It extends along the radial direction (arrow D direction) from the side to the inner peripheral side of the stator core 2. Thus, the connection terminal 5 is not extended long along the axial length direction (arrow L direction) of the stator core 2. For this reason, when connecting the several superconducting coil 4 with which the electric current of an in-phase is supplied through the connection terminal 5, the dimension of an axial length direction (arrow L direction) is suppressed. As a result, it is advantageous for miniaturization in the axial length direction (arrow L direction) of the motor having the stator 1.

  Further, as shown in FIG. 1, the wiring connection holes 56 of each connection terminal 5 are located on the case 3 side, that is, on the outer end portion 53 side of the connection terminal 5, so that they are located on the inner peripheral side of the stator core 2. Compared to the above, the operation of connecting the connection line 57 to the wiring connection hole 56 can be facilitated. Therefore, it is easy to connect the superconducting coils 4 to which currents of the same phase (U-phase, V-phase, W-phase) are supplied to the connection terminals 5 and the wiring connection holes 56 of the connection terminals 5.

(Embodiment 2)
FIG. 7 shows a second embodiment. This embodiment has basically the same functions and effects as those of the first embodiment. FIG. 7 shows a cross section showing the thickness of the wound body 40 constituting the superconducting coil 4 around which the superconducting wire is wound (hatching indicates only lead wires 41 and 42). In FIG. 7, in the superconducting coil 4, the straight portions 40 a located on opposite sides of the wound body 40 via the coil center line P <b> 2 form a “C” shape so as to form a “C” shape. The angle θ1 is inclined with respect to the coil center line P2. Therefore, in the cross section shown in FIG. 7, the first lead wire 41 and the second lead wire 42 are arranged so as to approach each other as they go in the radially inward direction (arrow Di direction) of the stator core 2. In this embodiment as well, as described in the first embodiment, when each connection terminal 5 is assembled to the stator core 2, the slits 58 of each connection terminal 5 are arranged along the radial direction (this applies mutatis mutandis. FIG. 3), in other words, the stator cores 2 are arranged so as to approach each other as they go in the radially inward direction (arrow Di direction). In this case, it corresponds to the case where the entire superconducting coil 4 is bent after winding the wound body 40. According to this embodiment, since the first lead wire 41 and the second lead wire 42 can be easily inserted into the slit 58 of the connection terminal 5, the stress acting on the first lead wire 41 and the second lead wire 42. The load is reduced.

(Embodiment 3)
FIG. 8 shows a third embodiment. This embodiment has basically the same functions and effects as those of the first embodiment. FIG. 8 shows a cross section showing the thickness of the wound body 40 constituting the superconducting coil 4 around which the superconducting wire is wound (hatching indicates only lead wires 41 and 42). In FIG. 8, in the superconducting coil 4, the straight portions 40 a located on opposite sides of the wound body 40 via the coil center line P <b> 2 are substantially parallel to the coil center line P <b> 2 of the superconducting coil 4. Has been. The slot 24 and the slit 58 of each connection terminal 5 are arranged along the radial direction with respect to the core center line P1 (FIG. 3 applied mutatis mutandis). For this reason, when each connecting terminal 5 is assembled in a state where it is inserted into the slot 24 of the stator core 2 and the slit 58 of each connecting terminal 5, the straight portion 40a, the first lead wire 41 and the second lead wire 42 are “ The shape of the letter “C” is bent.

(Embodiment 4)
9 to 13 show a fourth embodiment. This embodiment has basically the same functions and effects as those of the first embodiment. A superconducting motor as a superconducting rotating electrical machine includes a stator 1. 9 and 10 show the stator 1. FIG. 9 is a cross-sectional view taken along the core center line P1 extending linearly of the stator core 2 so as to include the core center line P1. FIG. 10 shows an end view projected from the arrow PB direction (see FIG. 9) substantially parallel to the core center line P1 of the stator core 2. FIG.

  As shown in FIG. 9, the stator 1 includes a stator core 2 having a core center line P <b> 1, a case 3, a superconducting coil 4, and a plurality of connection terminals 5. As shown in FIG. 9, the stator core 2 has a cylindrical shape formed around the core center line P1, and is formed of a material having a high magnetic permeability. The stator core 2 has a ring-shaped outer peripheral surface 20 and ring-shaped shaft end surfaces 21 and 22 formed around the core center line P1.

  As shown in FIG. 10, a plurality of slots 24 and teeth 25 are alternately arranged in the inner circumferential portion of the stator core 2 in the circumferential direction around the core center line P <b> 1 (arrow S direction). The teeth 25 and the slots 24 extend along the axial length direction (arrow L direction) of the stator core 2 along a direction substantially parallel to the core center line P1. As shown in FIG. 11, the plurality of teeth 25 and the plurality of slots 24 are respectively in the radial direction of the stator core 2 (in the arrow D direction, that is, the radial direction radiated from the core center line P1 toward the outer peripheral side, that is, (Centripetal direction toward the core center line P1).

  As shown in FIG. 9, the case 3 has a cylindrical shape that covers the outer periphery of the stator core 2, and is formed of a nonmagnetic material such as stainless steel, hard resin, or ceramics. As shown in FIG. 9, on one shaft end surface 22 of the stator core 2, an insulating portion 6 that functions as a terminal block having high electrical insulation is seated and fixed by a fixture 7B. As shown in FIG. 9, the fixture 7 </ b> B is fastened to the long shaft portion 70 inserted into the through hole 6 k of the insulating portion 6 and the through hole 2 k of the stator core 2, and one end portion of the long shaft portion 70 in the length direction. It has the 1st head 71 applied to the insulation part 6, and the 2nd head 72 fastened to the other end part of the longitudinal direction of the long shaft part 70, and was applied to the axial end surface 21 of the stator core 2. As shown in FIG.

  The insulating portion 6 extends in a ring shape around the core center line P1, and is formed of an electrically insulating material made of FRP, hard resin, or the like. Depending on the case, you may form with ceramics. As shown in FIG. 9, the insulating portion 6 has a ring-shaped shaft end surface 68 facing the shaft end surface 22 of the stator core 2 and a ring-shaped shaft end surface 69. As shown in FIG. 10, the superconducting coil 4 has a length LC, and a plurality of superconducting coils 4 are arranged side by side along the circumferential direction (arrow S direction) around the core center line P <b> 1 on the inner peripheral side of the stator core 2. In FIG. 10, the virtual surface DB indicates a two-dimensional virtual surface along the radial direction (arrow D direction) of the stator core 2 while passing through the core center line P1 so as to include the core center line P1. The virtual plane DC indicates a virtual plane orthogonal to the virtual plane DB while passing through the superconducting coil 4 in FIG. As shown in FIG. 10, a plurality of superconducting coils 4 are arranged side by side along the circumferential direction (arrow S direction) while being inclined with respect to the virtual line DC. As shown in FIG. 10, the plurality of superconducting coils 4 are arranged in parallel so that adjacent superconducting coils 4 overlap in the circumferential direction (direction of arrow S) of the stator core 2. In this case, when a rotating magnetic field is formed by energizing the superconducting coil 4 connected in the same phase, it can contribute to improvement of the waveform of the rotating magnetic field moving in the circumferential direction (arrow S direction).

  As shown in FIG. 13, the superconducting coil 4 has a double pancake shape of a racetrack (track and field stadium) shape. Double means double in the coil center line P2. As shown in FIG. 13, the superconducting coil 4 is led out while being separated from the wound body 40 by a distance WA from the wound body 40 formed by multiply winding the superconducting wire around the coil center line P <b> 2. A first lead line 41 and a first lead line 41 are provided. The wound body 40 of the superconducting coil 4 has a straight part 40a in which a superconducting material is extended in a straight line and a bent part 40c in which the superconducting material is bent in an arc shape. A straight portion 40a is inserted into the single slot 4 (see FIGS. 11 and 12).

  The superconducting wire is made of a superconducting material, and is particularly preferably made of a high-temperature superconducting material. The superconducting wire has a tape shape, and has a thin rectangular shape having a long side 43 and a short side 44 and a thickness T3 (see FIG. 13). In the cross section, the straight portions 40a constituting the wound body 40 are substantially parallel to each other. Similarly, the first lead line 41 and the second lead line 42 are substantially parallel to each other.

  Regarding the superconducting coil 4, the first lead wire 41 and the second lead wire 42 are in the same direction from the wound body 40 of the superconducting coil 4 in the axial length direction (arrow L direction) of the stator core 2 (arrow L1 shown in FIG. 13). Protruding in the direction). As described above, the first lead wire 41 and the second lead wire 42 are extended in the same direction (arrow L1 direction) while being substantially parallel to each other. In the direction of arrow D, the first lead wire 41 is located on the inner peripheral side, and the second lead wire 42 is located on the outer peripheral side.

  FIG. 11 shows a part of the plurality of superconducting coils 4 in a state where the superconducting coil 4 is assembled in the slot 24. As can be understood from FIG. 11, the straight portions 40 a of the wound body 40 of the superconducting coil 4 are respectively inserted into the slots 24. The bent portion 40 c of the wound body 40 of the superconducting coil 4 is constructed so as to straddle the plurality of teeth 25 and the plurality of slots 24 of the stator core 2. Thus, the superconducting coil 4 is assembled in the slot 24.

  As shown in FIG. 11, the slot 24 extends radially from the core centerline P1. As shown in FIG. 11, the first lead wire 41 and the second lead wire 42 of the same superconducting coil 4 are substantially parallel to each other while being inclined with respect to the radial direction (arrow D direction) of the stator core 2. .

  Here, as shown in FIG. 12, the first lead wire 41 of the superconducting coil 4 is located on the inner peripheral side of one slot 24 (24A), and the second lead wire 42 is the other slot 24 (24B). It is located on the outer peripheral side. As shown in FIG. 10, the connection terminal 5 extends along the radial direction (arrow D direction) of the stator core 2 from the outer peripheral side of the stator core 2 to the inner peripheral side of the stator core 2. Thus, as in the case of the first embodiment, the connection terminal 5 extends along the radial direction of the stator core 2, not along the axial length direction (arrow L direction) of the stator core 2. For this reason, the dimension of the stator 1 in the axial length direction (arrow L direction) is suppressed, and consequently the stator 1 is reduced in size in the axial length direction (arrow L direction).

  Further explanation will be added. As shown in FIG. 10, the connection terminal 5 is formed of a first connection terminal 510 and a second connection terminal 520 having a shorter length than the first connection terminal 510. The length of the first connection terminal 510 is relatively long. The length of the second connection terminal 520 is relatively short. In the circumferential direction (arrow S direction), the first connection terminals 510 and the second connection terminals 520 are alternately arranged.

  FIG. 12 shows an arrow W12 in FIG. As shown in FIG. 12, the first connection terminal 510 has an inner end portion 51 that has a first slit 581 as a first insertion hole and is bent along the circumferential direction (almost arrow S direction) of the stator core 2. , An intermediate portion 52 extending in the radial direction (arrow D direction), and an outer end portion 53 having a fixing hole 55. In the first connection terminal 510, the first slit 581 opens on the inner end surface of the inner end portion 51 of the first connection terminal 510, and extends linearly from the inner end 581i toward the outer peripheral side.

  As shown in FIG. 12, the first lead wire 41 of the superconducting coil 4 is inserted into the first slit 581 of the first connection terminal 510 having a long length, and is made of a bonding material such as a solder material, a welding material, or a conductive binder. Are combined. The second lead wire 42 of the same superconducting coil 4 is inserted into the second slit 582 of the second connection terminal 520 and is coupled by a bonding material such as a solder material, a welding material, or a conductive binder.

  In the first connection terminal 510 having a long length, the outer end portion 53 has a fixing hole 55 for fixing the first connection terminal 510 to the stator core 2 via the insulating portion 6. The intermediate part 52 has a wiring connection hole 56 (wiring connection part) penetrating in the thickness direction of the first connection terminal 510. The second connection terminal 520 includes an inner end 51 having a second slit 582 as a second insertion hole and an outer end 53 having a fixing hole 55. In the second connection terminal 520 having a short length, the second slit 582 opens in the inner end surface of the inner end portion 51 of the second connection terminal 520 and extends linearly from the inner end. The second connection terminal 520 has a fixing hole 55 for fixing the second connection terminal 520 to the stator core 2 via the insulating portion 6. The second connection terminal 520 has a wiring connection hole 56 that penetrates in the thickness direction of the second connection terminal 520.

  As shown in FIG. 12, in the first connection terminal 510 having a long length, the wiring connection hole 56 is separated from the first slit 581, and the wiring connection hole 56 is closer to the outer peripheral side of the stator core 2. For this reason, compared with the case where the wiring connection hole 56 is close to the inner peripheral side of the stator core 2, the wiring work for connecting the wiring 57 to the wiring connection hole 56 of the first connection terminal 510 and wiring is facilitated. This is because the outer circumferential side has a relatively longer circumferential length in the direction of arrow S than the inner circumferential side, so that space can be taken. Similarly, in the second connection terminal 520 having a short length, the wiring connection hole 56 is separated from the second slit 582, and the wiring connection hole 56 is provided close to the outer peripheral side of the stator core 2. For this reason, the wiring work of connecting the connecting wire 57 to the wiring connecting hole 56 of the second connecting terminal 520 for wiring is facilitated.

  As described above, as the plurality of superconducting coils 4, there are a superconducting coil 4 in which the U phase of three-phase alternating current is energized, a superconducting coil 4 in which the V phase is energized, and a superconducting coil 4 in which the W phase is energized. The superconducting coils 4 to which the U phase is energized are electrically connected in series via a connection line (not shown). The superconducting coils 4 to which the V phase is energized are electrically connected in series via a connection line (not shown). The superconducting coils 4 to which the W phase is energized are electrically connected in series via the connection line 57. In addition, as shown in FIG. 12, it is preferable that the slit width of the 1st slit 581 and the 2nd slit 582 is the grade which can insert the thickness of the 1st lead line 41 and the 2nd lead line 42. As shown in FIG.

  FIG. 11 shows a state where three superconducting coils 4 among the plurality of superconducting coils 4 are assembled in the slot 24. Each superconducting coil 4 is assembled in the slot 24 in an inclined state with respect to the radiation extending in the radial direction (arrow D direction) of the stator core 2, that is, the radial direction from the core center line P1. Therefore, for the same superconducting coil 4, the first lead wire 41 is located on the inner peripheral side of the slot 24, and the second lead wire 42 is located on the outer peripheral side of the slot 24. Thus, for the same superconducting coil 4, the first lead wire 41 and the second lead wire 42 are in the radial direction (arrow D direction) of the stator core 2, that is, for the radiation extending in the radial direction from the core center line P1. While being inclined, they are substantially parallel to each other.

  In other words, with respect to the same superconducting coil 4, the first slit 581 for inserting the first lead wire 41 and the second slit 582 for inserting the second lead wire 42 are inclined with respect to the radial direction (arrow D direction). However, they are oriented almost parallel to each other. Thus, the first slit 581 is directed in the same direction as the direction in which the first lead wire 41 of the same superconducting coil 4 is directed. The second slit 582 is directed in the same direction as the direction in which the second lead wire 42 of the same superconducting coil 4 is directed.

  According to the present embodiment, the straight portion 40a of the wound body 40 of the superconducting coil 4, and thus the first lead wire 41 and the second lead wire 42, without forcibly inclining into a “C” shape. Good and straight. In this case, in the superconducting coil 4, the stress load applied to the straight portion 40 a, the first lead wire 41 and the second lead wire 42 of the wound body 40 is reduced, and the durability of the superconducting coil 4 is improved. It is advantageous for improving the current carrying performance.

  Further explanation will be added. As shown in FIG. 12, the direction of the first slit 581 formed in the first connection terminal 510 and the second slit 582 formed in the second connection terminal 520 in order to connect the same superconducting coil 4 is as follows. They are almost parallel to each other. Thus, the first slit 581 and the second slit 582 for connecting the same superconducting coil 4 are oriented in directions substantially parallel to each other. As described above, the first lead wire 41 and the second lead wire 42 are substantially parallel to each other in the superconducting coil 4 and are directed in the same direction as the first slit 581 and the second slit 582. For this reason, the first lead wire 41 and the second lead wire 42 of the superconducting coil 4 are inserted into the first slit 581 and the second slit 582 without difficulty. For this reason, the stress load applied to the first lead wire 41 and the second lead wire 42 is reduced, which is advantageous in improving the durability of the superconducting coil 4 and the energizing performance of the superconducting coil 4.

  As described above, according to the present embodiment, in the end view 10 projected from a direction substantially parallel to the core center line P1 of the stator core 2, each connection terminal 5 is connected to the inside of the stator core 2 from the outer peripheral side of the stator core 2. It extends along the radial direction (arrow D direction) toward the circumferential side. Thus, the connection terminal 5 is not extended along the axial length direction (arrow L direction) of the stator core 2. For this reason, when the superconducting coil 4 to which the current of the same phase is supplied is connected via the connection terminal 5, the dimension in the axial direction (arrow L direction) is suppressed. As a result, the stator 1 is reduced in size in the axial length direction (arrow L direction).

(Embodiment 5)
14 to 17 show the fifth embodiment. This embodiment has basically the same effects as the above embodiment. FIG. 14 shows a superconducting coil 4K. The superconducting coil 4K includes a wound body 40 formed by multiply winding a superconducting wire around its own coil center line P2, and a first lead wire 41 and a second lead out from the wound body 40 in opposite directions. A lead wire 42 is provided. As shown in FIG. 14, the wound body 40 of the superconducting coil 4K has a straight portion 40a in which the superconducting material is extended in a straight shape, and a bent portion 40c in which the superconducting material is bent in an arc shape. . The superconducting wire is made of a superconducting material, and is particularly preferably made of a high temperature superconducting material. The superconducting wire has a tape shape and has a thin rectangular shape having a long side 43 and a short side 44 and a thickness T3 in cross section. In the cross section, the straight portions 40a extending in the direction of the arrow L constituting the wound body 40 are parallel to each other. Similarly, the first lead wire 41 and the second lead wire 42 run parallel to each other. That is, the first lead wire 41 and the second lead wire 42 are opposite to each other in the axial length direction (arrow L direction) of the stator core 2 from the wound body 40 of the superconducting coil 4 (arrow L3 and L4 directions shown in FIG. 14). ) Run parallel to protrude. As described above, the first lead line 41 and the second lead line 42 are substantially parallel to each other and extend in opposite directions.

  As shown in FIG. 15, the first connection terminal 510 is attached to one shaft end surface 22 of the stator core 2 via the insulating portion 6. The second connection terminal 520 is attached to the other shaft end surface 21 of the stator core 2 via the insulating portion 6. In this way, the first connection terminal 510 and the second connection terminal 520 are assembled on the opposite sides in the axial length direction (arrow L direction) of the stator core 2.

  FIG. 16 is an end view projected from the direction of arrow PE in FIG. 15 and shows a state where the first lead wire 41 of the superconducting coil 4 is inserted into the first slit 581 of the first connection terminal 510. The length of the first connection terminal 510 is indicated as L5 (see FIG. 16). FIG. 17 is an end view projected from the direction of the arrow PF in FIG. 15 and shows a state where the second lead wire 42 of the superconducting coil 4 is inserted into the second slit 582 of the second connection terminal 520. The length of the second connection terminal 520 is indicated as L6 (see FIG. 17, L6> L5).

  According to the present embodiment, as shown in FIG. 16, the first connection terminal 510 is assembled to one shaft end surface 22 of the stator core 2, but the second connection terminal 520 is not assembled. For this reason, on one shaft end face 22 side, the interval SM (see FIG. 16) between the first connection terminals 510 adjacent in the circumferential direction (arrow S direction) can be increased, so that a work space is secured and workability is improved. . In addition, the width dimension SD1 (see FIG. 16) of the first connection terminal 510 in the circumferential direction (arrow S direction) can also be increased, and as a result, the conductive cross-sectional area of the first connection terminal 510 can be increased. Resistance can be reduced. Furthermore, since the interval SM (see FIG. 16) between the first connection terminals 510 can be increased, even when a high voltage is applied to the first connection terminals 510, the discharge suppression between the adjacent first connection terminals 510 is suppressed. Is advantageous.

  As shown in FIG. 17, the second connection terminal 520 is assembled to the other shaft end surface 21 of the stator core 2, but the first connection terminal 510 is not assembled. For this reason, in the other shaft end surface 21, since the interval SN (see FIG. 17) between the second connection terminals 520 adjacent in the circumferential direction (arrow S direction) can be increased, a work space is ensured and workability is improved. In addition, the width dimension SD2 (see FIG. 17) of the second connection terminal 520 in the circumferential direction (arrow S direction) can also be increased, and consequently the conductive cross-sectional area of the second connection terminal 520 can be increased. Resistance can be reduced. Furthermore, since the interval SN (see FIG. 17) between the second connection terminals 520 can be increased, it is advantageous for suppressing discharge between the adjacent second connection terminals 520.

(Embodiment 6)
FIG. 18 shows a sixth embodiment. The present embodiment shows a modification of the fourth embodiment, and basically has the same function and effect as the fourth embodiment. The shape of the superconducting coil 4 (410, 420, 430, etc.) and the arrangement with respect to the slot 24 are basically the same as those in the fourth embodiment. In the present embodiment, a three-phase alternating current of the same phase flows through two adjacent superconducting coils 4. Specifically, the U phase flows through adjacent superconducting coil 410 and superconducting coil 420. V phase flows through adjacent superconducting coil 430 and superconducting coil 440. The W phase flows through the next two superconducting coils (not shown in FIG. 18). This embodiment is used when the respective superconducting coils 4 are connected as described above.

  Further explanation will be added. In the present embodiment, as shown in FIG. 18, the connection terminals 5 are a first connection terminal 510, a second connection terminal 520, and a third connection terminal 530 that are arranged side by side in the circumferential direction (arrow S direction) of the stator core 2. And. That is, as the connection terminal 5, the first connection terminal 510, the second connection terminal 520 having a shorter length than the first connection terminal 510, and a short protrusion 535 are provided in the length direction of the first connection terminal 510. Three types of the third connection terminal 530 having different shapes are used. The protrusion 535 protrudes in the circumferential direction.

  The first connection terminal 510 has substantially the same shape as that of the fourth embodiment, and has a first slit 581 on the inside of the diameter. The second connection terminal 520 has substantially the same shape as that of the fourth embodiment and has a second slit 582. The third connection terminal 530 has a shape similar to that of the first connection terminal 510, and has a protrusion 535 that protrudes in the circumferential direction at an intermediate portion in the length direction. The third connection terminal 530 has a first slit 581 and a second slit 582 formed in the protrusion 535 on the inner diameter side. When viewed from the axial direction of the stator core 2, the second slit 582 is in a position corresponding to the vicinity of the bottom of the slot 24 (the same position as the slit of the second connection terminal 520 in the fourth embodiment). The first slit 581 is located near the opening of an adjacent slot (the same position as the slit of the first connection terminal 510 in the fourth embodiment).

  As shown in FIG. 18, the first lead wire 41 of one superconducting coil 410 is inserted and connected to the first slit 581 (first insertion hole) of the first connection terminal 510. The second lead wire 42 of another superconducting coil 420 provided adjacent to one superconducting coil 410 is inserted into and connected to the second slit 582 (second insertion hole) of the second connection terminal 520. Then, two superconducting coils 410 and 420 adjacent in the circumferential direction (arrow S direction) are energized through the third connection terminal 530 with the same phase (for example, U phase) current.

With reference to FIG. 18, the connection between the superconducting coils 410 and 420 will be further described by taking the connection between the superconducting coil 410 and the superconducting coil 420 as an example. Of the lead wires 41 and 42 of the superconducting coil 410, one first lead wire 41 (inner peripheral side) is inserted into and connected to the first slit 581 of the first connection terminal 510. The other second lead wire 42 (outer peripheral side) of the superconducting coil 410 is inserted and connected to the second slit 582 (located near the bottom on the outer edge side of the slot 24) of the projection 535 of the third connection terminal 530. ing. As shown in FIG. 18, in the other first slit 581 of the third connection terminal 530 (located near the opening on the inner edge side of the slot 24), one first lead wire 41 (inner The peripheral side) is inserted and connected. The other second lead wire 42 (outer peripheral side) of the superconducting coil 420 is inserted and connected to the second slit 582 of the second connection terminal 520.
As shown in FIG. 18, a connection line 57 a is fixed to the wiring connection hole 56 of the second connection terminal 520. A connection line 57 c is fixed to the wiring connection hole 56 of the first connection terminal 510. Thereby, it is connected in series with other superconducting coils of the same phase.

  With the configuration described above, the superconducting coil 410 and the superconducting coil 420 adjacent to each other in the circumferential direction (arrow S direction) are connected in series via the third connection terminal 530. As a result, in-phase (U-phase) current is applied to superconducting coils 410 and 420 adjacent to each other in the circumferential direction (arrow S direction). A U-phase current path, a V-phase current path, and a W-phase current path are illustrated in FIG.

  As can be understood from FIG. 18, for example, the U-phase current path is formed as follows. That is, the U-phase current path includes paths U1, U2, U3, U4, U5, U6, and the like. Specifically, as illustrated in FIG. 18, the U-phase current path includes the connection line 57 a, the wiring connection hole 56 of the second connection terminal 520, the second slit 582 of the second connection terminal 520, and the first of the superconducting coil 420. 2 lead wire 42, superconducting coil 420, first lead wire 41 of superconducting coil 420, first slit 581 of third connection terminal 530, projection 535 of third connection terminal 530, second slit 582 of projection 535, second 1 Superconducting coil 410 second lead wire 42, superconducting coil 410, superconducting coil 410 first lead wire 41, first connection terminal 510 first slit 581, first connection terminal 510, first connection terminal 510 wiring connection An energization path connected to the hole 56 and the connection line 57c is formed.

  Superconducting coils 430 and 440 are connected in the same manner, and a phase (V phase) different from the phase (U phase) of superconducting coils 410 and 420 adjacent in the circumferential direction (arrow S direction) is connected to superconducting coils 430 and 440. Energized. That is, as shown in FIG. 18, the V-phase current path includes paths V1, V2, V3, V4, V5, V6, V7, and the like. Specifically, the V-phase current path includes the superconducting coil 440, the first lead wire 41 of the superconducting coil 440, the first slit 581 of the third connection terminal 530, the protrusion 535 of the third connection terminal 530, and the protrusion 535. Second slit 582, second lead wire 42 of superconducting coil 430, superconducting coil 430, first lead wire 41 of superconducting coil 430, first slit 581 of first connection terminal 510, first connection terminal 510, first connection. An energization path connected to the wiring connection hole 56 and the connection line 57c of the terminal 510 is formed.

  According to the present embodiment, as shown in FIG. 18, in addition to the first connection terminal 510 and the second connection terminal 520, the third connection terminal 530 is provided. Here, the superconducting coils 410 and 420 adjacent to each other in the circumferential direction (arrow S direction) are directly joined using one third connection terminal 530 (530A). Superconducting coils 430 and 440 adjacent to each other in the circumferential direction (arrow S direction) are directly joined using another third connection terminal 530 (530B). Thereby, the connection work can be simplified, and the effect of reducing the connection resistance can be obtained.

(Other)
In the first embodiment, in the circumferential direction (arrow S direction) of the stator core 2, the plurality of superconducting coils 4 are arranged so as to partially overlap in the circumferential direction. However, depending on the case, the superconducting coil 4 and the superconducting coil 4 may not overlap in the circumferential direction. Although the superconducting coil 4 of the stator is applied to a superconducting motor in which a three-phase alternating current is applied, the present invention is not limited to this, and a DC motor having a superconducting coil may be used. The rotating electrical machine is a motor, but may be applied to a generator. The present invention is not limited to the embodiments described above and shown in the drawings, and can be implemented with appropriate modifications within the scope not departing from the gist.

  1 is a stator, 2 is a stator core, P1 is a core center line, 24 is a slot, 25 is a tooth, 3 is a case, 30 is a thin part, 33 is a thick part, 4 is a superconducting coil, P2 is a coil center line, 40 is Winding body, 41 is a first lead wire, 42 is a second lead wire, P2 is a coil center line, 5 is a connection terminal, 50 is a main body, 51 is an inner end, 52 is an intermediate portion, and 53 is an outer end. , 54 is a flange part, 510 is a first connection terminal, 520 is a second connection terminal, 6 is an insulating part (electrical insulator), 55 is a fixing hole, 56 is a wiring connection hole, 57 is a connection line, and 58 is a slit ( An insertion hole), 581 is a first slit (first insertion hole), 582 is a second slit (second insertion hole), and 7 is a fixture.

Claims (6)

A cylindrically shaped stator core formed around the core centerline;
A case covering the outer periphery of the stator core;
A plurality of coils are arranged in parallel along the circumferential direction on the inner circumferential side of the stator core, and a winding body formed by winding a superconducting wire around the coil center line and a cross-section derived from the winding body is thin. A superconducting coil having a rectangular lead wire;
A plurality of connection terminals formed of a conductive material fixed in an electrically insulated state to the stator core or the case and connecting the superconducting coils to each other;
Each of the connection terminals includes an insertion hole for inserting and holding the lead wire of the superconducting coil, and extends from the outer peripheral side of the stator core to the inner peripheral side of the stator core. A superconducting rotating electrical machine stator in which the lead wire of the superconducting coil is inserted and held in the insertion hole of the terminal and electrically connected thereto. In Claim 1 , the lead wire has a first lead wire and a second lead wire protruding from the winding body of the superconducting coil in the axial length direction of the stator core,
The first lead wire and the second lead wire are oriented so as to approach each other in the radial direction of the stator core,
The insertion hole has a first insertion hole into which the first lead wire of one superconducting coil is inserted, and a second insertion hole into which the second lead wire of one superconducting coil is inserted. ,
The first insertion hole is oriented in substantially the same direction as the first lead wire of one superconducting coil, and the second insertion hole is oriented in substantially the same direction as the second lead wire of one superconducting coil. Superconducting rotating electrical machine stator. In Claim 1 , the lead wire has a first lead wire and a second lead wire protruding from the winding body of the superconducting coil in the axial length direction of the stator core,
The first lead line and the second lead line are substantially parallel to each other;
The insertion hole has a first insertion hole into which the first lead wire of one superconducting coil is inserted, and a second insertion hole into which the second lead wire of one superconducting coil is inserted. ,
The first insertion hole is oriented in substantially the same direction as the first lead wire of one superconducting coil, and the second insertion hole is oriented in substantially the same direction as the second lead wire of one superconducting coil. Superconducting rotating electrical machine stator. In one of Claims 2-3 , the said 1st lead wire and the said 2nd lead wire protrude in the mutually same direction from the said winding body of the said superconducting coil in the axial length direction of the said stator core,
The connection terminal has a first connection terminal having the first insertion hole for inserting the first lead wire of the superconducting coil, and a second insertion hole for inserting the second lead wire of the superconducting coil. 2 connection terminals,
The superconducting rotating electrical machine stator, wherein the first connection terminal and the second connection terminal are arranged on the same side in the axial direction of the stator core. In one of Claims 2-3 , the said 1st lead wire and the said 2nd lead wire protrude in the mutually opposite direction from the said winding body of the said superconducting coil in the axial length direction of the said stator core,
The connection terminal has a first connection terminal having the first insertion hole for inserting the first lead wire of the superconducting coil, and a second insertion hole for inserting the second lead wire of the superconducting coil. 2 connection terminals,
The superconducting rotating electrical machine stator, wherein the first connection terminal and the second connection terminal are arranged on opposite sides in the axial length direction of the stator core. A cylindrically shaped stator core formed around the core centerline;
A case covering the outer periphery of the stator core;
A plurality of coils are arranged in parallel along the circumferential direction on the inner circumferential side of the stator core, and have a wound body formed by winding a superconducting wire around a coil center line and a lead wire led out from the wound body. A superconducting coil;
A plurality of connection terminals formed of a conductive material fixed in an electrically insulated state to the stator core or the case and connecting the superconducting coils to each other;
Each of the connection terminals extends from the outer peripheral side of the stator core to the inner peripheral side of the stator core, and each of the connection terminals is electrically connected to the lead wire of the superconducting coil,
The connection terminal includes a first connection terminal, a second connection terminal, and a third connection terminal arranged in parallel in the circumferential direction of the stator core,
Two superconducting coils adjacent in the circumferential direction are connected to each other via the third connection terminal, and a current of the same phase is supplied to the superconducting coils adjacent in the circumferential direction via the third connection terminal. Superconducting rotating electrical machine stator.

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