JP5239449B2 - Cylindrical rotor of rotating electrical machine - Google Patents

Description

  The present invention relates to a cylindrical rotor of a rotating electrical machine such as a turbine generator, and more particularly to an improvement in a cooling structure of a coil end portion of the rotor winding.

  A rotating electric machine having a cylindrical rotor is used for various applications, and is often used for a large-capacity turbine generator. The general turbine generator shown in FIGS. 8 to 12 will be described below.

  FIG. 8 is a vertical cross-sectional view schematically showing a main part of a general turbine generator disclosed in Patent Document 1 and the like. 9 is a plan view taken along the arrow P in FIG. 8, FIG. 10 is a cross-sectional view taken along line A-C in FIG. 9, and FIG. 11 is a cross-sectional view taken along line B-C in FIG. FIG. 12 is a partial front view in which a part Q shown in FIG.

  8 to 12, the turbine generator 9 includes a casing 6, a stator 7, a two-pole cylindrical rotor 8, axial fans 69 and 69, and a cooling device 93. A gap 91 is interposed between the outer peripheral surface of the cylindrical rotor 8 and the inner peripheral surface of the stator 7. The cylindrical rotor 8 includes a rotating shaft portion 81, a rotor core portion 82 formed integrally with the rotating shaft portion 81, a pair of rotor windings 2 and 2 corresponding to a two-pole machine, and a ring shape. The holders 83 and 83 are rotatably supported by the stator 7 via bearings (not shown) in the casing 6.

  In some turbine generators, an axial fan 69 is provided only on one of the rotating shaft portions 81 and a refrigerant gas flow path is formed so that the refrigerant gas circulates in the casing 6.

  Each rotor winding 2 is composed of a plurality of layer coils 22 formed by winding wire conductors 21 made of flat copper wires in multiple layers. Each layer coil 22 is loaded in a winding groove different from a plurality of winding grooves (not shown) formed in the rotor core portion 82 at a predetermined interval in the circumferential direction. A large number of vent holes 88 are formed in a portion of the rotor winding 2 housed in the winding groove of each layer coil 22 and distributed in the axial length direction of the rotary shaft portion 81. The pair of rotor windings 2 and 2 having the above-described structure are in a line-symmetric relation with respect to the central axis (indicated by a one-dot chain line in FIG. 8) XX of the rotation shaft portion 81. It is arranged like this.

  Winding end portions (coil end portions) 29 and 29 projecting out of the winding groove from both end portions of the rotor core portion 82 of the rotor winding 2 are at least outer peripheral portions thereof by a ring-shaped holding body 83. Are protected from being deformed by a large centrifugal force generated by the rotation of the cylindrical rotor 8. Here, the holding body 83 includes a cylindrical portion 831 that holds each coil end portion 29 of the rotor winding 2 and an annular portion 832 that is coupled to the cylindrical portion 831 at the end on the fan 69 side. (See FIG. 12).

  The fans 69 and 69 are provided to circulate the refrigerant gas 99 for cooling the cylindrical rotor 8 and the stator 7 in the turbine generator 9, and are provided at the coil end portions 29 at both ends of the rotor winding 2. The rotary shaft 81 is fitted into the rotary shaft 81 at a position outside the axial length direction. As is well known, the stator 7 is formed by laminating a large number of thin iron core plates in the axial direction, and is formed on a stator core 71 having a circular inner diameter concentric with the rotary shaft portion 81, and the stator core 71. And a stator winding 72 loaded in a plurality of winding grooves (not shown). A large number of ventilation ducts 73 for allowing the refrigerant gas 99 to flow therethrough are formed at important points in the stacking direction of the iron core plates of the stator iron core 71.

  Next, the flow path of the refrigerant gas 99 provided in the casing 6 will be described. First, the casing 6 is circumscribed on the outer peripheral surface of the stator core 71, and a total of four partition plates 61 and 62 are provided as shown in the figure at intervals in the stacking direction of the core plates of the stator core 71. . A plurality of cylindrical connecting ducts 63 are arranged so as to connect the outer partition plate 61 and the inner partition plate 62. The spaces partitioned by the partition plate 61 and the partition plate 62 become the exhaust ducts 64 and 64, and the space partitioned by the partition plates 62 and 62 on both sides becomes the central air supply duct 65. In addition, intake ducts 66 and 66 are provided at both ends of the casing 6 so as to correspond to the fans 69 and 69, respectively.

  The cooling device 93 connects a known cooler 94 that removes heat from the refrigerant gas 99 that has become high temperature by cooling the cylindrical rotor 8 and the stator 7, and the cooler 94 and the exhaust ducts 64 and 64. And an intake wind tunnel 96, 96 connecting the cooler 94 and the intake ducts 66, 66 (see FIG. 9).

  In the turbine generator 9 configured as described above, the refrigerant gas 99 pressurized by the fans 69 and 69 is first branched into three roughly in the vicinity of the holding body 83. That is, the refrigerant gas flow 99A flowing directly into the gap 91 from both ends through the outer periphery of each holding body 83 and the center air supply via the connecting duct 63 after cooling both ends of the stator winding 72 The refrigerant gas flow 99B flowing into the duct 65 and the refrigerant gas flow flowing into the rotor winding 2 from each of the spaces between the outer peripheral surface of each rotary shaft portion 81 and the holding body 83 and the rotor coil end portion 29. It is divided into 99C.

  The refrigerant gas flow 99C reaches the end of the rotor core 82 while cooling the end portion (coil end portion) 29 of the rotor winding 2, and many portions of the refrigerant gas flow 99C are the end portions. Then, the gas flows into the gas flow path provided at the bottom of the winding groove, cools the rotor winding 2, and then flows out from the air vent 88 to the gap 91. The refrigerant gas flow 99B flows through the ventilation duct 73 communicated with the central air supply duct 65, and cools the stator core 71 and the stator winding 72, while the central portion of the stator core 71 in the stacking direction. Flows into the gap portion 91. In this way, the refrigerant gas 99 merged in the gap 91 flows through the ventilation duct 73 communicating with the exhaust ducts 64, 64, and exhausts while cooling the stator core 71 and the stator winding 72. It reaches the ducts 64 and 64.

  The refrigerant gas 99 that has reached the exhaust ducts 64 and 64 cools the cylindrical rotor 8 and the stator 7 and has a relatively high temperature. The high-temperature refrigerant gas 99 passes through the exhaust wind tunnel 95. It flows into the cooler 94 and is cooled. The refrigerant gas 99 cooled to the low temperature again by the cooler 94 is sucked by the fan 69 through the intake wind tunnels 96 and 96 and the intake ducts 66 and 66 and supplied into the casing 6.

As described above, in the turbine generator 9, the refrigerant gas 99 is circulated through the cooler 94 to cool the inside to obtain a stable operation state. However, the turbine generator 9 is employed in this type of rotating electric machine. In particular, the rotor winding 2 of the cylindrical rotor 8 has a tendency that the temperature of this portion tends to increase because the coil end portion 29 is not sufficiently cooled. For this reason, in order to raise the cooling effect of the coil end part of this rotor winding | winding and to reduce temperature conventionally, the device is performed, and the prior art example shown by patent document 1 as one example is FIGS. It shows in FIG.
13 is an enlarged partial sectional perspective view showing an R portion in FIG. 8, FIG. 14 is an enlarged partial perspective view showing an L portion in FIG. 13, and FIG. 15 shows an arcuate portion 24 of the rotor winding 2. It is a longitudinal cross-sectional view of the strand conductor 21 to form. 16 is a partial front sectional view showing an enlarged R portion in FIG. 8, FIG. 17 is a partial sectional view taken along the line U-U in FIG. 16, and FIG. 18 is taken along the line V-V in FIG. 19 is a partial sectional view taken along line WW in FIG. 13, and FIG. 20 is a partial plan view taken along arrow P in FIG.

As shown in these drawings, the cylindrical rotor 8 is arranged on a rotating shaft portion 81, a rotor core portion 82, a pair of rotor windings 2, and a coil end portion 29 of the rotor winding 2. The plurality of spacers 54 and 54A, the partition wall body 55, the partition wall body 56, the outer peripheral insulator 57, the plurality of wedges 3, the holding bodies 83, 83, and the like are configured in a bipolar structure. . The rotor winding 2 is composed of a plurality (six in this case) of layer coils 22 formed by winding a wire conductor 21 made of a flat copper wire for each magnetic pole a plurality of times. Each layer coil 22 is formed as a well-known saddle coil. The central portion of the linear portion 23 of each layer coil 22 is loaded into a different winding groove 84 of the rotor core portion 82, and the arc-shaped portion 24 of the layer coil 22 is the coil end portion of the rotor winding 2. 29 main parts are formed.
A spacer 54 is disposed between the coil end portions 29 of each layer coil 22, and a spacer 54 A is disposed on the outer surface of the outermost layer coil 22 and the inner surface of the innermost layer coil 22. A large stress acting on the coil end portion 9 is dealt with in accordance with an acceleration generated at the time of acceleration / deceleration of the rotor 8. The spacer 54 includes a substrate portion 541 made of an elongated flat plate-like electric insulating material, and a plurality of protrusion portions 542 made of an electric insulating material formed with a certain thickness on each of both side surfaces of the substrate portion 541. It is configured. The protrusion 542 is provided to ensure a flow path through which the refrigerant gas 99 flows along the side surface of the layer coil 2 in the coil end portion 29. The spacer 54 includes a plurality of protrusions 542 on both side surfaces of the substrate portion 541. The spacer 54A differs from the spacer 54 in that the plurality of protrusion portions 542 are provided only on one side surface of the substrate portion 541. doing.

  The substrate portion 541 included in the spacers 54 and 54A has a width dimension substantially equal to the dimension H in the height direction of the layer coil 22 and has a length along the length direction of the strand conductor 21. The protrusions 542 in the spacers 54 and 54A have a shape having a pointed head such as a mountain shape or a triangle, are provided at intervals in the length direction of the substrate portion 541, and the end surface on the side opposite to the substrate portion 541 is a layer. It abuts on the side surface of the coil 22. The protrusions 542 are formed at both end portions in the width direction of the substrate portion 541 with their sharp heads facing inward, and the positions thereof are shifted from each other by a half-interval length.

  As a result, on the side surface of the coil end portion 29 of the layer coil 22, a flow passage 543 having a zigzag shape formed by the protrusions 542 through which the refrigerant gas 99 flows is formed. When this passage 543 is observed in association with a through hole 55a described later, the passage 54X through which the refrigerant gas 99 flows from the through hole 55a along the linear portion 23 of the layer coil 22, and the layer from the through hole 55a. It can be grasped as a flow path 54Y through which the refrigerant gas 99 flows along the arcuate portion 24 of the coil 22 (see FIG. 13). Note that a rectangular shape is also known as the shape of the protrusion 542.

  The partition wall 55 arranged on the surface of the coil end portion 29 of each layer coil 22 facing the rotating shaft portion 81 forms a cylinder as a whole using an electrical insulating material, and the layer coil 22 in the coil end portion 29 has a cylindrical shape. It is arranged on the inner peripheral side with a space between the outer peripheral surface of the rotary shaft portion 81. In the partition wall 55, a through hole 55a (see FIG. 16) is provided as a refrigerant gas flow path in the portion immediately below the connecting portion between the linear portion 23 and the arc-shaped portion 24 of the layer coil 22, and an exhaust chamber 56X described later. A through hole 55b (see FIG. 17) is formed in a portion facing each other. The partition wall body 56 is a pair of two pairs in total (because it is a two-pole machine), and the partition wall body 55 is divided so that a portion where the exhaust chamber 56X is to be formed is partitioned. It arrange | positions in contact with a surrounding surface (refer FIG. 17).

  Of the four spaces formed on the inner peripheral side of the partition wall body 55 by partitioning the both sides with the partition wall bodies 56, 56, the two spaces located immediately below the intermediate position of the magnetic pole are refrigerant gas. Two spaces located immediately below the center position of the magnetic pole (the center line YY of the magnetic pole is indicated by a two-dot chain line in FIG. 17) are the inflow chamber 55X into which the flow 99C flows. 56X. The exhaust chamber 56X is closed at the end on the fan 69 side, and the end on the anti-fan 69 side is communicated with an exhaust groove 86 (see FIG. 13) described later. The end of the inflow chamber 55X on the fan 69 side is opened, and the end on the anti-fan 69 side is communicated with a groove passage 84a described later.

  The outer peripheral insulator 57 is formed in a cylindrical shape using an electrical insulating material, and is disposed between the outer peripheral side of the layer coil 22 in the coil end portion 29 and the inner peripheral side of the cylindrical portion 831 of the holding body 83. (See FIG. 17). The wedge 3 prevents the portion of the rotor winding 2 loaded in the winding groove 84 from jumping out of the winding groove 84 due to a large centrifugal force generated by the rotation of the cylindrical rotor 8. For this purpose, it is mounted so as to close the opening of the winding groove 84.

  As shown in FIGS. 18 to 20, the wedge 3 is formed with oval through holes 3 a that are long in the axial direction of the rotary shaft portion 81, and each through hole 3 a is formed in the strand conductor 21. It communicates with the groove portion passage channel 84a (see FIG. 13) through a through hole 21a described later. The groove portion passage channel 84a is formed at the bottom of each winding groove 84 along the axial length direction of the rotary shaft portion 81, and both end portions of the groove portion passage passage 84a communicate with the inflow chamber 55X. . The vent hole 88 in the cylindrical rotor 8 of the turbine generator is formed by a through hole 3a of the cylindrical rotor 8 and various through holes described later formed in association with the layer coil 22. It will be configured.

  The rotor core portion 82 includes a plurality of winding grooves 84 according to the number and position corresponding to the layer coils 22 constituting the pair of rotor windings 2, 2, a tooth portion 85, and a plurality of exhaust grooves. 86 are formed as shown in FIG. A stepped portion 84b is formed at the bottom of each winding groove 84, and the groove-passing channel 84a described above is formed below the stepped portion 84b (see FIG. 18). Further, a portion of the rotor core portion 82 that forms the side opposite to the tooth portion 85 of the winding groove 84 in which the outermost and innermost layer coils 22 are loaded, and both ends of each tooth portion 85 in the axial length direction. An exhaust passage 85a is formed in the part.

Here, with reference mainly to FIGS. 18-20, the electrical insulation in the coil | winding groove | channel 84 of the cylindrical rotor 8 and the flow path of the refrigerant | coolant gas 99 are further demonstrated. In each of the winding grooves 84, first, a pair of groove insulators 581 in which an electrical insulating material is formed in an L shape is illustrated for electrical insulation between the rotor core portion 82 and the layer coil 22. It is loaded as follows. The groove insulator 581 is placed on the stepped portion 84b of the groove having an L-shaped bottom portion so that a gap 581a having a width W ₅₈₁ is formed between the tip portions. The layer coil 22 is loaded in the winding groove 84 such that the lower surface and both side surfaces thereof are electrically insulated by the groove insulator 581. The wedge 3 is mounted on the upper side of the layer coil 22 via an upper insulator 582 made of an electrical insulating material. Reference numeral 511 denotes an inter-strand insulator made of an electrical insulating material for electrically insulating the conductor conductors 21 from each other.

  Refrigerant gas 99 (refrigerant gas flow 99Z to be described later) is provided along the axial length direction of the rotating shaft portion 81 in the portion accommodated in the winding groove 84 of the wire conductor 21 constituting each layer coil 22. A plurality of through-holes 21a are formed for allowing flow through. Each through-hole 21 a is formed in a long oval shape along the axial length direction of the rotary shaft portion 81 in order to ensure a wide flow area for the refrigerant gas 99. Further, through-holes 511a and 582a having substantially the same shape as the through-hole 21a are also formed in the inter-element insulator 511 and the upper insulator 582 at positions facing the through-hole 21a. And the through-hole 3a formed in the wedge 3 is formed in the site | part facing the said through-holes 51a, 511a, and 582a, as shown in FIG. 18 and FIG.

  Further, in order to improve the cooling effect of the coil end portion 29 of the rotor coil 2, as shown in FIGS. 14 and 15, the refrigerant gas 99 flows through both side surfaces of the wire conductor 21 of the arc-shaped portion 24. A concave groove 25 is formed. Each concave groove 25 has its opening 25a facing the side where the spacer 54 or the spacer 54A is disposed. The effective cross-sectional area excluding the concave groove 25 of the wire conductor 21 of the arc-shaped portion 24 is selected to be the same as that of the linear portion 23.

  The flow path of the refrigerant gas flow 99C in the conventional cylindrical rotor 8 configured as described above is formed as follows. That is, the refrigerant gas flow 99C sent to each inflow chamber 55X (see FIG. 13) by the fan 69 flows into the groove passage 84a along the axial length direction of the rotation shaft portion 81 in the inflow chamber 55X. First, the gas flow 99Z and the refrigerant gas flow that flows into the zigzag through-flow channel 54X and the groove 25 formed by the spacers 54 and 54A on the side surface of the layer coil 22 from the through hole 55a of the partition wall 55 are branched. Is done. Further, the refrigerant gas flow that has flowed in through the through-hole 55a flows in the vicinity of the through-hole 55a through the zigzag through-flow channel 54X formed on the end surface of the arc-shaped portion of the coil end portion of the layer coil 22. The flow 99X and the refrigerant gas flow 99Y flowing through the zigzag-shaped flow path 54Y side formed on the side surface of the linear portion of the coil end portion of the layer coil 22 are further branched.

  The refrigerant gas flow 99Z passes through the inflow chamber 55X → the groove portion passage channel 84a → the vent hole 88 (the gap portion 581a, the through holes 51a, 511a and 582a, and the through hole 3a) and then flows into the gap portion 91, During this time, the portion loaded in the winding groove 84 of the linear portion of the rotor winding 2 and the rotor core portion 82A are cooled.

  The refrigerant gas flow 99X sequentially passes through the inflow chamber 55X → the through hole 55a → the passage 54X → the exhaust passage 85a and then flows into the gap 91 (see FIG. 8). A portion of the coil-like portion 23 that protrudes from the rotor core and is exposed in the coil end portion 29 and both ends of the rotor core portion 82 are cooled.

  Further, the refrigerant gas flow 99Y sequentially passes through the inflow chamber 55X → the through hole 55a → the through passage 54Y and the concave groove 25 → the through hole 55b → the exhaust chamber 56X → the exhaust groove 86 and flows into the gap 91, The arcuate portion 24 of the rotor winding 2 and both ends of the rotor core portion 82 are cooled.

  As the flow path of the refrigerant gas flow 99Y in the arcuate portion 24 of the rotor winding 2, the flow path in the concave groove 25 of the wire conductor 21 is added to the flow path of the spacer 54A, so that the refrigerant gas flow Fluid resistance to 99Y is reduced. Moreover, since the end surface of the concave groove 25 in the length direction of the arc-shaped portion 24 is naturally open to the end surface side of the arc-shaped portion 24, the refrigerant gas flow 99Y immediately after flowing out of the through hole 55a is It will easily flow into the groove 25. As a result, the flow rate of the refrigerant gas flow 99Y can be further increased.

  The area in which the refrigerant gas flow 99 </ b> Y comes into contact with the arc-shaped portion 24 increases because the wire conductor 21 of the arc-shaped portion 24 has the concave groove 25. That is, in the coil end portion 29 of the rotor winding 2 of the cylindrical rotor 1, both the flow rate of the refrigerant gas flow 99Y and the heat radiation area of the arc-shaped portion 24 with respect to the refrigerant gas flow 99Y increase, and the refrigerant The cooling effect of the arc-shaped portion 24 is increased in combination with the easy flow of the gas flow 99Y into the concave groove 25. As a result, the temperature rise of the arcuate part 24 is reduced including the connection part with the linear part 23 of the coil end part of the rotor winding 2.

  Further, since the refrigerant gas flow paths 54X and 54Y in the coil end portion are zigzag-shaped flow paths, the refrigerant gas flows 99X and 99Y flowing through the coil end portions are in contact with the side surface of the layer coil 22 for a relatively long time. Therefore, the layer coil 22 can be cooled satisfactorily. By providing such a cooling configuration, the cylindrical rotor 8 can improve the cooling effect of the rotor winding 2 including the coil end portion 29.

In the above-described conventional example, the wire conductor 21 of the arc-shaped portion of the coil end portion of the rotor winding 2 is provided with the concave groove 25 opened on the side surface to enhance the cooling effect of the coil end portion. As shown in FIG. 21 instead of the concave groove 25, it is proposed in Patent Document 1 that a hollow hole 26 b may be provided in the wire conductor 21.
Japanese Patent No. 3911146

  In the above-described conventional device, the concave grooves 25 provided to allow the refrigerant gas to flow through the wire conductor at the arc-shaped portion of the coil end portion of the rotor winding are formed at both ends in the width direction of the wire conductor. Therefore, the cooling of the central portion in the width direction of the wire conductor becomes insufficient, and the refrigerant gas formed by combining a spacer on the side surface of the arc-shaped portion of the coil end portion of the rotor winding is passed. Since the flow path and the flow path of the refrigerant gas formed by the concave groove of the wire conductor are joined and guided to a common discharge chamber, reduction of fluid resistance in this flow path is limited However, there is a problem that the refrigerant gas flow rate cannot be increased.

  Further, as shown in FIG. 21, when the arcuate portion of the coil end portion in the rotor winding is constituted by the wire conductor 21 provided with the hollow hole 25b for allowing the refrigerant gas to flow, the hollow hole 25b Although the cooling effect of the center part of a strand conductor can be heightened by providing in the center part of the strand conductor in the width direction, there exists a problem that the manufacturing cost of the strand conductor 21 becomes high. In addition, in this case, the coil end portion of the rotor winding is also formed by the communication groove 46 (see FIG. 21) in which the flow path of the refrigerant gas formed by the hollow hole 25b of the wire conductor is provided in the arc-shaped portion 24. Since the refrigerant gas flow path formed by combining the spacer 54 on the side surface of the arc-shaped portion 24 is joined to the common discharge chamber, the reduction of the fluid resistance of the flow path is limited. Therefore, there is a problem that a large increase in the refrigerant gas flow rate cannot be expected.

  In order to solve the above-described problems, the present invention can increase the cooling flow by increasing the flow rate of the refrigerant gas flowing through the arcuate portion of the coil end portion of the rotor winding, and can be manufactured. An object of the present invention is to provide a cylindrical rotor for a rotating electrical machine that is inexpensive.

In order to solve the above-described problem , according to the present invention, a rotating shaft portion and a plurality of circular shafts that are substantially concentric with the rotating shaft portion and that are formed along the circumferential direction of the outer periphery are formed. Refrigerant gas disposed in at least one of a rotor core having a winding groove, a rotor winding for one or more pairs of magnetic poles, and an outer position in the axial length direction of the rotating shaft. A cooling fan for circulation, and the rotor winding for each magnetic pole is composed of a plurality of layer coils formed by winding a plurality of flat rectangular wire conductors, and each layer coil Refrigerant gas that cools the rotor windings to the side portions of the respective layer coils in the coil end portions of the rotor windings, which are loaded in different winding grooves but are not housed in the winding grooves. Spacers that form a flow path for flow are arranged. Each of the layer coils of the rotor winding is arranged substantially parallel to each other, and a pair of linear portions whose central portions in the lengthwise direction are loaded in the winding groove; A pair of arc-shaped portions connected between the ends of both linear portions and arranged substantially in parallel with each other so that at least the coil end portion of the rotor winding is cooled by the refrigerant gas. to the cylindrical rotor of a rotating electrical machine formed by, the strand conductors configuring the arcuate portion of the coil end portion having the layer coils of the rotor winding, the hand at least surface overlapping one another when stacked A concave groove for flowing refrigerant gas is formed in the surface, and a first through hole is formed on the bottom wall of each concave groove so as to overlap with each other and communicate with each other. The refrigerant gas passage Provided independently of the refrigerant gas flow path formed by the pacer, an outflow chamber is formed between the rotor core and the layer coil, and the layer coil is in communication with the outflow chamber. Two through holes are formed at a position immediately below the first through hole, and a third through hole communicating with the outflow chamber is formed on an extension of the refrigerant gas flow path formed by the spacer. It is characterized by being.

Further, according to the present invention, in the above configuration, the cross-sectional area of the concave groove is configured such that the outer diameter side is larger than the inner diameter side, and the air volume on the outer diameter side is larger than the inner diameter side. To do.
According to the present invention, in the above-described configuration, the cross-sectional area of the concave groove is configured so that the end side is larger than the magnetic pole side, and the air volume on the end side is increased from the magnetic pole side.

In addition, according to the present invention, in the above-described configuration, the width of the concave groove is increased to be close to the width of the wire conductor.

According to the present invention, in the above-described configuration, at least a part of the end side of the refrigerant gas inlet portion of the concave groove has an oblique shape, and an opening area of the refrigerant gas inlet portion is increased. .

According to the present invention, in the above configuration, at least one concave or convex is formed on the inner wall surface of the concave groove.
Further, according to the present invention, in the above configuration, the strand conductors are laminated through an insulating sheet, you characterized in that the formation of the groove only on the outer peripheral surface.

  According to the present invention, in the cylindrical rotor of the rotating electrical machine, the concave groove for flowing the refrigerant gas formed in the wire conductor constituting the arc-shaped portion of the coil end portion of the layer coil of the rotor winding is bare. Since the wire conductors are formed so as to be opened on one surface side where the wire conductors are overlapped with each other, the processing becomes easier and can be manufactured at a lower cost as compared with the wire conductors provided with the hollow holes.

  In the present invention, the refrigerant gas outlet of the refrigerant gas passage formed by the concave groove for refrigerant gas passage formed in the wire conductor of the arc-shaped portion of the layer coil of the rotor winding, Since it is provided independently of the refrigerant gas outlet of the refrigerant gas passage formed by the spacer, the refrigerant gas is passed through the arc-shaped portion of the coil end portion of the layer coil of the rotor winding. Since it is possible to reduce the flow resistance by increasing the area of the outlet of the flow path for cooling this part, it is possible to increase the flow rate of the refrigerant gas to this flow path to enhance the cooling effect. it can.

Further, according to the present invention, by rotating the concave groove for flowing refrigerant gas formed in the wire conductor of the arc-shaped portion of the layer coil of the rotor winding as much as possible to the full width of the wire conductor, The entire wire conductor of the arc-shaped portion of the layer coil of the child winding can be cooled almost uniformly, the temperature distribution of the wire conductor can be made more uniform, and the inner wall surface of the concave groove for refrigerant gas flow By forming at least one concave or convex, it is possible to obtain a high cost such as further enhancing the cooling effect by the concave groove of the wire conductor.
Furthermore, according to the present invention, the cross-sectional area of the concave groove is configured such that the outer diameter side is larger than the inner diameter side, and the air volume on the outer diameter side is increased from the inner diameter side, or the cross-sectional area of the concave groove is The configuration is such that the end side is larger than the end side, and the air volume at the end side is increased from the magnetic pole side, thereby complementing the difference in the length of the wire conductor and the difference in the air flow rate in the cooling flow path due to the radial position. The temperature of each wire conductor in the coil end portion can be made uniform.

  Furthermore, according to this invention, at least a part of the end side of the refrigerant gas inlet portion of the concave groove is formed in an oblique shape, and the opening area of the inlet portion is increased, whereby the refrigerant gas flows into the concave groove. Can be made easier.

  Furthermore, according to the present invention, when the wire conductors are stacked via an insulating sheet, the insulating sheet is formed by centrifugal force due to rotation of the cylindrical rotor by forming the concave groove on the outer peripheral surface. It is possible to prevent bending.

  Embodiments of the present invention will be described based on the examples shown in FIGS.

FIG. 1 is a cross-sectional perspective view showing a configuration of the embodiment of the present invention (corresponding to the R portion of the turbine generator in FIG. 8), FIG. 2 is an enlarged perspective view showing a T portion in FIG. 1, and FIG. 2 is a longitudinal sectional view taken along line III-III in FIG. 2, FIG. 4 is a partial plan view of a wire conductor used in the present invention, and FIG.
It is a longitudinal cross-sectional view which follows a line.

In the embodiment of the present invention shown in FIGS. 1 to 5, the basic configuration of the rotor winding 2 of the cylindrical rotor and the flow path of the refrigerant gas is substantially the same as the conventional example, and therefore the same as the conventional device. Components are shown with the same reference numerals.
In the present invention, similarly to the conventional apparatus, the refrigerant gas flow is achieved by applying spacers 54 or 54A to the linear portions 23 and the arc-shaped portions 24 of the coil end portions of the layer coil 22 constituting the rotor winding 2, respectively. Channels 54X and 54Y are formed.
The partition wall 55 provided on the outer periphery of the rotating shaft portion 81 is provided with a through hole 55a for guiding the refrigerant gas from the refrigerant gas inflow chamber 55X to the refrigerant gas passages 54X and 54Y. Further, the refrigerant gas flow passage 54Y on the end surface side in the axial direction of the arc-shaped portion 24 of the layer coil 22 is communicated with the outflow chamber 56X via a through hole 55b serving as an outlet provided in the partition wall 55 (FIGS. 1 and FIG. 1). 4).

  The wire conductor 21 constituting the arc-shaped portion 24 of the coil end portion of the layer coil 22 of the rotor winding 2 is provided with a concave groove 26 through which refrigerant gas flows, as shown in FIG. It is done. The concave groove 26 is opened in at least one of the overlapping surfaces when the wire conductors 21 are stacked via an insulating sheet (not shown). The wire conductor 21 provided with such a concave groove 26 can be easily manufactured by drawing or cutting. In addition, when providing the concave groove 26 in both surfaces of the strand conductor 21, an insulating sheet is provided only in the surface which the strand conductor 21 mutually overlaps. When the concave groove 26 is provided on one surface of the strand conductor 21, it is provided on the outer peripheral surface side. By doing in this way, even if the insulating sheet is subjected to centrifugal force due to the rotation of the cylindrical rotor 8, the insulating sheet is a surface opposite to the surface provided with the concave groove 26 of the wire conductor 21. Therefore, the insulating sheet can be prevented from being bent.

  Further, as shown in FIG. 4, a through hole 27 serving as an outlet of the refrigerant gas passage is provided in the bottom wall of the concave groove 26 of the wire conductor 21. The through-hole 27 is a through-hole 55 c provided in the partition wall 55, as shown in FIG. It is provided in the part located immediately above. As a result, the refrigerant gas flow passage 26Y of the arc-shaped portion 24 of the layer coil 22 formed by the concave groove 26 of each wire conductor 21 has an opening at the circumferential end face of the concave groove serving as an inlet and the partition 55. Through the through-hole 55a, it communicates with the inflow chamber 55X on the rotary shaft portion 81, and is independent of the outflow chamber 56X on the rotary shaft portion 81 through the through-hole 27 in the bottom wall of the concave groove 26 and the through-hole 55b in the partition wall 55. To communicate with each other. 3 and 4, the number of the through holes 27 is one, but it is needless to say that two may be provided.

  Further, in FIG. 2, if the end side 100 of the strand conductor 26 surrounded by a two-dot chain line is eliminated and at least a part of the end side of the refrigerant gas inlet portion is inclined, the opening area of the refrigerant gas inlet portion is increased. The refrigerant gas flow 99Y can easily enter the concave groove 26 by increasing the size.

According to this invention, since it is configured in this way, the refrigerant gas pressurized by the fan 69 (see FIG. 8) flows from the inflow chamber 55X on the rotating shaft portion 81 to the layer coil 22 through the through hole 55a. It is supplied to the linear part 23 and the arcuate part 24. A part of the supplied refrigerant gas becomes a refrigerant gas flow 99X flowing in a zigzag manner by the protrusions 542 in the flow passage 54X formed by the spacers 54A on the side of the linear portion 23, and is a gap portion through the exhaust passage 85a. 91 (see FIG. 8), during which the linear portion 23 of the coil end portion is cooled.
On the other hand, the refrigerant gas passes through the flow path 54Y formed by the spacer 54 or 54A of the arcuate portion 24 of the coil end portion of the layer coil 22 and the flow path 26Y formed by the concave groove 26 of the wire conductor 21. The refrigerant gas flows 99Y and 99Y ′ flow. Refrigerant gas flow 99Y through the Tsuryuro 54Y flows from the through-hole 55 b of the partition wall 55 into the outflow chamber 56X, flowing from the exhaust passage 86 to the gap portion 91. The refrigerant gas flow 99Y ′ flowing through the flow path 26Y formed by the concave groove 26 of the wire conductor 21 flows out from the through hole 27 provided in the bottom wall of the concave groove 21 and the through hole 55c provided in the partition wall 55. It flows into the chamber 56 </ b> X and flows out to the gap portion 91 via the discharge path 86. The arcuate portion 24 of the coil end portion of the layer coil 22 is cooled by the refrigerant gas flows 99Y and 99Y ′.

  According to the present invention, in the arc-shaped portion 24 of the coil end portion of the layer coil 22, the refrigerant gas flow path 54 </ b> Y formed by the spacer 54 or 54 </ b> A on the end surface side in the axial direction, and the wire conductor 21 is recessed. Since the flow paths 26Y formed by the grooves 26 are parallel flow paths independent of each other, the fluid resistance of the flow path of the refrigerant gas for cooling the arc-shaped portion 24 is reduced, and the flow rate is increased. be able to. For this reason, the cooling effect of the arc-shaped part 24 of the coil end part of the layer coil 22 can be further enhanced.

FIG. 6 shows a modified example of the concave groove 26 provided in the wire conductor 21 in the present invention.
The groove 26 according to this modification is provided with a large number of irregularities on its inner wall surface, thereby increasing the heat radiation area for the refrigerant gas flowing in the groove 26 on the inner wall surface of the groove 26.
Thus, if the heat radiation area for the refrigerant gas in the groove 26 in the wire conductor 21 is increased, the cooling effect of the arcuate portion 24 of the coil end portion by the refrigerant gas can be further enhanced, which is advantageous. is there.

In the present invention, the cross-sectional area of the wire conductor 21 constituting the arcuate portion of the coil end portion of the rotor winding is the effective cross-sectional area excluding the concave groove 26 is a straight line not provided with the concave groove. Since the cross-sectional area may be selected so as to be equal to the cross-sectional area 23, the shape of the concave groove 26 is not limited and can be a free shape. Therefore, when a constant cross-sectional area of the groove 26 (and thus the refrigerant gas passing flow rate constant), the width d _m as shown in FIG. 5, so mutually superimposed on both end portions in the width direction of the element wire conductor 21 By extending the width d _m to the limit to leave the support allowance d ₀ that maintains the minimum mechanical strength required for supporting, and making the depth h shallower by that amount, Since the concave groove 26 can be expanded to almost the full width of the strand conductor 21, the entire strand conductor 21 can be cooled more uniformly, thereby improving the cooling effect.

  Furthermore, in the present invention, the shape of the concave groove 26 is not limited and can be made into a free shape. Therefore, it is easy to adjust the cooling air volume of the concave groove 26.

  For example, for the winding conductor on the end side with a long circumferential portion, the air volume of the cooling flow path is smaller than that on the inner diameter side, so the cross-sectional area of the groove is increased to increase the total air volume, For the winding conductor on the magnetic pole side with a short circumferential portion, the air volume in the cooling channel is larger than the others, so reduce the cross-sectional area of the groove or distribute the air volume without the groove, Optimization can be achieved. In addition, even for the difference in the airflow of the cooling flow path due to the radial position of the conductor, the airflow is similarly distributed, the temperature of each wire conductor is made uniform, the utilization rate of the cooling airflow is improved, and the airflow is optimized Can be realized.

  FIG. 7 is a diagram for explaining an example of distribution of the cooling air amount. FIG. 7A shows the relationship between the position in the rotation axis direction of the circumferential partial conductor and the amount of cooling air flowing through the groove 26. The length of the conductor in the circumferential direction portion is short on the magnetic pole side (conductor A) and long on the end side (conductor C). Therefore, when the cross-sectional area of the concave groove 26 is constant, the length of the conductor is long. Although the air volume decreases toward the end, the air volume can be increased by increasing the cross-sectional area of the concave groove 26 toward the end.

FIG. 7B shows the relationship between the radial position of the circumferential partial conductor and the amount of cooling air flowing through the groove 26. The length of the circumferential partial conductor is longer on the outer diameter side and shorter on the inner diameter side. Therefore, when the cross-sectional area of the concave groove 26 is constant, the air volume decreases as the conductor length increases toward the outer diameter side. However, it is shown that the air volume can be increased by increasing the cross-sectional area of the concave groove 26 toward the outer diameter side.
By optimizing in this way, the difference in the air flow rate of the cooling flow path due to the difference in the length of the circumferential partial conductor due to the position in the rotation axis direction and the radial direction is complemented, and each strand of the entire coil end portion The temperature of the conductor can be made uniform.

1 is a partial cross-sectional perspective view showing the configuration of an embodiment of the present invention. The perspective view which expands and shows the T section of FIG. FIG. 3 is a longitudinal sectional view taken along line III-III in FIG. 2. The fragmentary top view of the strand conductor used for this invention. It is a longitudinal cross-sectional view which follows the VV line of FIG. The longitudinal cross-sectional view which shows the example of the other strand conductor used for this invention. The figure for demonstrating the example of distribution of a cooling air volume. The longitudinal cross-sectional view which shows typically the principal part of a conventionally well-known general turbine generator. The top view of the P arrow of FIG. Sectional drawing which follows the AC line in FIG. Sectional drawing which follows the BC line in FIG. FIG. 8 is a configuration diagram including a partially broken section showing an enlarged Q portion in FIG. The fragmentary sectional perspective view which expands and shows the R section in FIG. The fragmentary perspective view which expands and shows the L section in FIG. Sectional drawing of the conventional strand conductor which forms the circular arc-shaped part 24 of the rotor coil | winding 2. FIG. The fragmentary sectional view which expands and shows the R section in FIG. FIG. 17 is a partial cross-sectional view taken along the line U-U in FIG. 16. The fragmentary sectional view which follows the VV line in FIG. The fragmentary sectional view which follows the WW line in FIG. FIG. 20 is a partial plan view taken in the direction of arrow P in FIG. 19. The fragmentary perspective view which shows the structure of the arc-shaped part of the layer coil of another prior art example.

Explanation of symbols

1: Turbine generator 2: Rotor winding 21: Wire conductor 22: Layer coil 23: Linear portion 24: Arc portion 26: Concave groove 27: Through hole 29: Rotor coil end (coil end portion)
5: Partition 55X: Refrigerant gas inflow chamber 56X: Refrigerant gas outflow chamber 69: Fan 8: Rotor 81: Rotating shaft portion 82A: Rotor core portion 83: Retaining body 99X, 99Y, 99Y ′, 99Z: Refrigerant gas Flow

Claims (7)

One or more rotor cores, a rotor core part having a plurality of winding grooves formed along the circumferential direction of the outer periphery and having an outer periphery formed in a circular shape substantially concentric with the rotary shaft part A rotor winding for a pair of magnetic poles, and a cooling fan for circulating a refrigerant gas disposed in at least one of the outer positions in the axial length direction of the rotating shaft portion. The rotor winding is composed of a plurality of layer coils formed by multiply winding a rectangular wire conductor, and each layer coil is loaded in a different winding groove, A spacer that forms a flow path for flowing a refrigerant gas for cooling the rotor winding is disposed on the side surface portion of each layer coil in the coil end portion of the rotor winding that is not housed in the coil. Each layer of the rotor winding And the central portion in the longitudinal direction is connected between the pair of linear portions loaded in the winding groove and the ends of both linear portions. In a cylindrical rotor of a rotating electrical machine comprising a pair of arcuate portions disposed substantially parallel to each other, wherein at least a coil end portion of the rotor winding is cooled by the refrigerant gas, Forming a concave groove for flowing refrigerant gas that opens on at least one of the surfaces that overlap each other when stacked, on the wire conductor that forms the arc-shaped portion of the coil end portion of the layer coil of the rotor winding ;
A first through hole is formed in the bottom wall of each of the concave grooves so as to overlap with each other and communicate with each other, and a refrigerant gas passage formed by the concave grooves is formed by the spacer. Provided independently of the refrigerant gas flow path,
An outflow chamber is formed between the rotor core and the layer coil,
In the layer coil, a second through hole communicating with the outflow chamber is formed at a position immediately below the first through hole, and a third through hole communicating with the outflow chamber is formed by the spacer. A cylindrical rotor of a rotating electrical machine, wherein the cylindrical rotor is formed on an extension of the refrigerant gas passage. The cylindrical rotor of the rotating electrical machine according to claim 1, wherein the cross-sectional area of the concave groove is configured so that the outer diameter side is larger than the inner diameter side, and the air volume on the outer diameter side is increased from the inner diameter side. A cylindrical rotor of a rotating electrical machine that is characterized. The cylindrical rotor of the rotating electrical machine according to claim 1 or 2, wherein the cross-sectional area of the concave groove is configured so that the end side is larger than the magnetic pole side, and the air volume on the end side is larger than the magnetic pole side. A cylindrical rotor of a rotating electrical machine that is characterized. 4. A cylindrical rotor for a rotating electrical machine according to claim 1, wherein a width of the groove is expanded to a width close to a width of the wire conductor. 5. The cylindrical rotor of the rotating electrical machine according to claim 1, wherein at least a part of an end side of the refrigerant gas inlet portion of the concave groove is an oblique shape, and an opening area of the refrigerant gas inlet portion is increased. A cylindrical rotor of a rotating electric machine characterized by 6. The cylindrical rotor for a rotating electrical machine according to claim 1, wherein at least one concave or convex is formed on the inner wall surface of the concave groove. The cylindrical rotor of the rotating electrical machine according to any one of claims 1 to 6, wherein the wire conductors are stacked via an insulating sheet, and the concave grooves are formed only on the outer peripheral surface side. A cylindrical rotor for a rotating electrical machine.

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