Rotor of a rotating electrical machine

Abstract

A rotor (100) comprises: a cylindrical retaining ring (3), the retaining ring covering the coil side end of a coil and the axial outer side of the retaining ring being open; and a rotor baffle (7) and an insulating baffle (8), the rotor baffle and the insulating baffle being alternately connected in the circumferential direction and dividing the space in the retaining ring (3) into a first space and a second space, the first space (SP1) being formed around a shaft (1) over the entire circumference, the rotor baffle (7) comprising a first tapered portion (72t1) at a portion where a bridging portion exists on the radial outer side of the rotor baffle (7), the first tapered portion being inclined toward the axial center side of the rotor (100) in a manner separate from the bridging portion.

Description

Technical Field

[0001] The present application relates to a rotor of a rotating electric machine. Background Art

[0002] Conventionally, as a rotor of a rotating electrical machine, a technology has been proposed for partitioning a space formed at a coil side end portion in the circumferential direction in order to form a ventilation path for cooling gas at the coil side end of the rotor (see, for example, Patent Document 1).

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2009-11059 Summary of the invention

[0006] Technical problem to be solved by the invention

[0007] The rotor of the rotating electric machine described in Patent Document 1 includes a cylindrical retaining ring on the outer peripheral side of the coil side end. The coil extending axially from each slot of the rotor core is bent 90 degrees in the circumferential direction, circumferentially wrapped along the inner circumferential surface of the retaining ring, and then bent 90 degrees in the axial direction before being housed again in the slot of the rotor core. The above-mentioned rotor includes four groups of such coils. In addition, the space radially inside the coil side end of the rotor is divided into four spaces in the circumferential direction by four rotor baffles arranged circumferentially. This space is set as the first space. There is an insulating baffle on the radially outer side of the above-mentioned first space, and a gap is opened between the insulating baffle and the rotor core. There is an axially erected coil side end on the outside of the above-mentioned gap.

[0008] In addition, the radially outer space of the insulating baffle is connected in the circumferential direction and is integrated with the radially outer space (collecting portion) of the rotor baffle. The above portion accommodates the bridging portion of the coil side end. A series of spaces existing radially outside the above gap are set as second spaces.

[0009] In the structure of Patent Document 1, the four first spaces are independent in the circumferential direction, and the cooling gas for cooling the coil side ends of the rotor is sucked in only from these parts. Therefore, in order to improve the suction efficiency of the cooling gas, a guide plate is provided at the entrance toward the first space. However, as described above, the inlet of the cooling gas is separated at four locations in the circumferential direction, and the axial ends between them are closed. Therefore, there is a technical problem that the inlet cross-sectional area of ​​the air path of the cooling gas sucked into the rotor is narrowed, thereby increasing the ventilation resistance.

[0010] In addition, there is the following technical problem: at the delayed side portion relative to the rotation direction, due to the separation of the cooling air flow, the ventilation resistance at the inlet of the rotor internal air path set inside the rotor increases, making it difficult for the cooling gas to enter the rotor internal air path.

[0011] In addition, there is a problem that the volume of cooling gas that flows between the conductors at the rotor coil ends from the first space to the converging portion of the second space and cools the coil ends is also insufficient, resulting in insufficient cooling capacity and increased coil temperature when the output of the rotating electrical machine is increased.

[0012] The present application discloses a technology for solving the above-mentioned technical problems, and its object is to provide a rotor of a rotating electrical machine capable of sufficiently supplying cooling gas to the coil side ends of the rotor and the inside of the rotor.

[0013] Technical solutions adopted to solve technical problems

[0014] The rotor of the rotating electric machine disclosed in the present application has:

[0015] shaft; a rotor core; and a coil, the coil being assembled to the slot of the rotor core, wherein,

[0016] The rotor comprises:

[0017] a cylindrical retaining ring, the retaining ring covering the coil side end of the coil and the axial outer side of the retaining ring being open; and

[0018] a rotor baffle and an insulating baffle, wherein the rotor baffle and the insulating baffle are alternately connected in the circumferential direction and divide the space in the retaining ring into a first space on the radially inner side where the coil side end does not exist and a second space on the radially outer side of the circumferential center where the coil side end exists,

[0019] The rotor baffle is arranged radially inward of a portion of the coil side end where the bridging portion is formed.

[0020] The insulating baffle is arranged along the radially inner end surface of the extension portion of the plurality of conductors constituting the coil side end portion.

[0021] There is a gap between the end of the insulating baffle on the center side of the rotor and the end surface of the rotor core.

[0022] The first space is formed around the shaft over the entire circumference.

[0023] The rotor shroud includes a first tapered portion at a portion of the rotor shroud radially outside where the bridge portion exists, the first tapered portion being inclined toward an axial center side of the rotor so as to be separated from the bridge portion.

[0024] Effects of the Invention

[0025] According to the rotor of the rotating electrical machine disclosed in the present application, at the radially outer portion of the first conical-shaped portion in the second space, the space expands radially toward the axial center side, so that the cooling gas flowing through the multiple gaps S between the conductors W1 to W6 and converging at the converging portion can be efficiently discharged to the first air path F1. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a perspective view of the rotor of the rotating electrical machine according to the first embodiment.

[0027] Figure 2 This is a partially cutaway perspective view of the rotor of the rotating electrical machine according to the first embodiment.

[0028] Figure 3 yes Figure 2 An enlarged view of the main part.

[0029] Figure 4 It means from Figure 3 A three-dimensional diagram showing a state in which the coil is removed.

[0030] Figure 5 Observe from different angles Figure 3 A perspective view of the main parts is shown.

[0031] Figure 6 It means from Figure 5 A three-dimensional diagram showing a state where the coil is removed.

[0032] Figure 7 This is a diagram of the rotor core, rotor shrouds, and insulating shrouds according to the first embodiment as viewed from the axial direction.

[0033] Figure 8 This is a perspective view of the rotor baffle viewed from the outer peripheral side.

[0034] Fig. 9 This is a perspective view of the rotor baffle viewed from the inner circumference side.

[0035] Fig.10 is Figure 5 A sectional stereoscopic view of the main parts of the rotor cut axially at the AA line.

[0036] Fig.11 is Figure 5 A sectional stereoscopic view of the main parts of the rotor cut axially at the BB line.

[0037] Fig.12 It is a schematic diagram showing the flow of cooling gas in the first space and the second space.

[0038] Fig.13This is a diagram of the rotor core, rotor baffles, and insulating baffles according to the second embodiment as viewed from the axial direction.

[0039] Fig.14 This is a diagram of the rotor core, rotor baffles, and insulating baffles according to the third embodiment as viewed from the axial direction.

[0040] Fig.15 This is a diagram of the rotor core, rotor baffles, and insulating baffles according to the fourth embodiment as viewed from the axial direction.

[0041] Fig.16 This is a diagram of the rotor core, rotor baffles, and insulating baffles according to the fifth embodiment as viewed from the axial direction.

[0042] Fig.17 This is a diagram of the rotor core, rotor baffles, and insulating baffles according to the sixth embodiment as viewed from the axial direction.

[0043] Fig.18 This is a diagram of the rotor core, rotor baffles, and insulating baffles according to the seventh embodiment as viewed from the axial direction.

[0044] Fig.19 This is a diagram of the rotor core, rotor baffles, and insulating baffles according to the eighth embodiment as viewed from the axial direction. DETAILED DESCRIPTION

[0045] Implementation Method 1

[0046] Hereinafter, the rotor of the rotating electrical machine according to the first embodiment will be described with reference to the drawings.

[0047] In this specification, when the axial direction, radial direction, or circumferential direction is not specifically mentioned, it means the axial direction, radial direction, or circumferential direction of the rotor. In addition, when the center side is mentioned, it means the center side of the rotor when the member or part is viewed. In addition, when the number is mentioned without special instructions, it means the number included on one end side of the rotor core.

[0048] Figure 1 It is a perspective view of a rotor 100 of a two-pole rotating electrical machine.

[0049] Figure 2 It is a partially cutaway perspective view of the rotor 100 .

[0050] The rotor 100 is mainly composed of a shaft 1, a rotor core 2, and a coil 4. In the present embodiment, the shaft 1 and the rotor core 2 are integrally processed, but the rotor core may be fitted to the outer peripheral surface of the shaft 1 as a single body.

[0051] Figure 3 yes Figure 2 An enlarged stereogram of the main part.

[0052] Figure 4 It means from Figure 3 A three-dimensional diagram showing a state in which the coil 4 is removed.

[0053] Figure 5 Observe from different angles Figure 3 A perspective view of the main parts is shown.

[0054] Figure 6 It means from Figure 5 A three-dimensional diagram showing a state where the coil is removed.

[0055] like Figure 4 , Figure 6 As shown, slots 21 for inserting the coils 4 are formed at intervals in the circumferential direction on the rotor core 2. Specifically, the slots 21 arranged in the circumferential direction are provided on the outer periphery of the rotor core 2, and the same number of slots 21 are provided at positions symmetrical to the slots 21 with respect to the central axis of the shaft 1. The slots 21 are provided to penetrate from one end of the rotor core 2 in the axial direction to the other end.

[0056] A cutout 22 is provided between the two groups of slots 21 at the end of the rotor core 2 in the circumferential direction. The cutout 22 extends from the end surface 2 t of the rotor core 2 to the outer circumferential surface.

[0057] The rotor 100 is a two-pole rotor, and two sets of coils 4 are assembled on the rotor core 2. Figure 5 As shown, the coil 4 corresponding to one pole is composed of a conductor W. A flat wire is used as the conductor W. Each conductor W extends from the axial end of the rotor core 2 through a gap between the conductors W adjacent in the axial direction to form a protruding portion, and after being bent 90 degrees in the circumferential direction, passes through the gap again in the circumferential direction in accordance with the curve of the outer peripheral surface of the rotor core 2 and surrounds in a manner of overlapping in the axial direction to form a bridging portion.

[0058] Here, the conductor W of the lower layer closest to the rotor core 2 among the conductors W forming the bridging portion is referred to as conductor W1, and conductors W2, W3, W4, W5, and W6 are referred to in order toward the axially outer side. In addition, the portion consisting of the above-mentioned protruding portion and the bridging portion, that is, the portion where the conductors W1 to W6 are exposed from the core in the axial direction is collectively referred to as a coil side end portion K. In addition, in this specification, the portion where the conductors W1 to W6 overlap in the axial direction is referred to as a bridging portion.

[0059] exist Figure 3 , Figure 5 In FIG. 1 , the conductors W4 , W5 , and W6 are depicted in a cut-off manner, but this is omitted for convenience of the following description. Actually, the conductors W4 , W5 , and W6 are connected in the circumferential direction similarly to the conductors W1 , W2 , and W3 .

[0060] like Figure 5As shown in FIG. 1 , a cylindrical retaining ring 3 is provided around the coil side end K to cover the coil side end K. By installing the retaining ring 3 on the rotor core 2, Figure 4 The cutout 22 shown forms a first air passage F1 that passes through the outer peripheral surface of the rotor core 2 from the end surface 2 t of the rotor core 2 .

[0061] The outer peripheral surfaces W1out to W6out of the conductors W1 to W6 constituting the coil side end K are arranged along the inner peripheral surface 3in of the retaining ring 3 via the insulator 35. In addition, there is a gap S between the adjacent conductors W1 to W6. The gap S exists continuously between the protruding portions of the conductors W1 to W6 extending from the slots 21 in the axial direction and between the bridging portions surrounding in the circumferential direction.

[0062] like Figure 6 , Figure 7 As shown, the slot 21 that accommodates the conductors W1 to W6 is actually formed to be longer than the radial width of the conductors W1 to W6. When the conductors W1 to W6 are accommodated in the slot 21, an inner rotor air path F2 (second air path) is formed axially along the conductors W1 to W6 on the radial inner side of the conductors W1 to W6.

[0063] Next, each member which is attached to the radial inner side of the conductors W1 to W6 and divides the internal space of the holding ring 3 into two spaces in the radial direction will be described.

[0064] like Figure 5 As shown, an annular end plate 6 is installed at the axial end of the retaining ring 3. The edge 61 of the outer peripheral side of the end plate 6 is located on the outer peripheral surface side of the retaining ring 3. In addition, there is a space along the circumferential direction between the edge 62 of the inner peripheral side of the end plate 6 and the outer peripheral surface of the shaft 1.

[0065] In a state where only the components described so far are installed, the interior surrounded by the retaining ring 3 and the edge end plate 6 is a large space that accommodates two coil edge ends K respectively composed of the conductors W1 to W6.

[0066] Figure 7 This is a diagram showing the components that divide the inner space of the retaining ring 3 into two spaces in the radial direction, namely, the rotor baffle 7 and the insulating baffle 8, as viewed from the axial direction. The symbol + in the symbol 0 indicates that the cooling gas flows from the front side of the paper to the back side of the paper.

[0067] Figure 8 This is a perspective view of the rotor shroud 7 as viewed from the outer peripheral side.

[0068] Fig. 9 This is a perspective view of the rotor shroud 7 as viewed from the inner peripheral side.

[0069] Fig.10 is Figure 51 is a cross-sectional perspective view of the main parts of the rotor 100 cut along the AA line portion in the axial direction.

[0070] Fig.11 is Figure 5 BB line portion of the rotor 10 is cut along the axial direction of the main part of the stereoscopic view.

[0071] Fig.12 Schematic diagram showing the flow of cooling gas in the first space and the second space. Fig.12 The rotor internal air passage F2 is recorded on the same plane, but in fact, the rotor internal air passage F2 and the rotor baffle 7 have Figure 7 The positional relationship is offset in the circumferential direction as shown.

[0072] The rotor baffle 7 is composed of an arc-shaped end member 71, a partition wall portion 72 and a partition portion 73. The above-mentioned end member 71 is formed along the edge 62 on the inner circumferential side of the edge end plate 6, the above-mentioned partition wall portion 72 extends from the edge on the inner circumferential side of the above-mentioned end member 71 toward the axial direction and the center side to the end face 2t of the rotor core 2, and the above-mentioned partition portion 73 extends radially outward from the circumferential ends of the partition wall portion 72.

[0073] Thus, the rotor baffles 7 and the insulating baffles 8 are alternately connected in the circumferential direction to divide the space in the retaining ring 3 into a first space SP1 radially inside where the coil side end K does not exist and a second space SP2 radially outside the circumferential center where the coil side end K exists.

[0074] As shown in the drawings, the partition wall portion 72 is curved in the circumferential direction coaxially with the central axis O of the rotor 100. In addition, the portion of the partition wall portion 72 where the conductors W1 to W6 are present at the radially outer portion is shaped to be inclined from the axial end portion toward the axial center side of the rotor 100 so as to be separated from the conductors W1 to W6. The above portion is referred to as a first tapered portion 72t1.

[0075] The portion of the partition wall portion 72 where the conductors W1 to W6 are not located on the radially outer side is shaped to be inclined from the end of the axial center side of the first tapered portion 72t1 toward the axial center side of the rotor 100 so as to approach the outer peripheral surface side of the rotor core 2. The above portion is referred to as the second tapered portion 72t2. Figure 7 As shown, the cross-sectional shape of the rotor baffle 7 perpendicular to the axial direction has a straight portion extending radially outward from both circumferential ends of an arc portion concentric with the cross-sectional shape perpendicular to the axial direction of the outer peripheral surface of the rotor core 2 .

[0076] The rotor shroud plate 7 is arranged so that the cutout 22 at the end of the rotor core 2 exists radially outside the partition wall portion 72 between the two partition portions 73, and the partition wall portion 72 exists radially inside the portion of the circumferential center portion of the coil side end portion K where the bridging portion is formed. In addition, the rotor shroud plate 7 is provided at a position symmetrical with respect to the central axis of the shaft 1.

[0077] like Figure 6 As shown, the radially outer end 73out of the partition portion 73 of the rotor shroud 7 is parallel to the central axis of the shaft 1 and is located radially outward of the partition wall portion 72 over the entire axial length thereof.

[0078] The insulating baffle 8 is provided to connect radially outer end portions 73out of the circumferentially adjacent partitions 73 of the rotor baffle 7 located at positions symmetrically sandwiching the central axis O of the shaft 1. The insulating baffle 8 has a shape obtained by bending a rectangular plate coaxially with the central axis O of the shaft 1. That is, the cross section of the insulating baffle 8 perpendicular to the axial direction is arc-shaped.

[0079] In addition, if Figure 5 , Figure 6 As shown, the insulating baffle 8 does not contact the rotor core 2, and a gap S1 is provided between the end 81 on the axial center side of the insulating baffle 8 and the end face 2t of the rotor core 2. The axial width of the gap S1 is substantially equal to the distance between the lower surface of the jumper wire of the conductor W1 and the end face 2t of the rotor core 2.

[0080] like Figure 6 As shown in FIG. 1 , the axially outer end of the insulating baffle 8 abuts against the lower surface of the edge end plate 6. Figure 6 , Fig.12 When the radially inner space surrounded by the two rotor baffles 7, the two insulating baffles 8, the shaft 1 and the end surface 2t of the rotor core 2 is set as the first space SP1, and the radially outer space surrounded by the two rotor baffles 7, the two insulating baffles 8, the retaining ring 3, the end surface 2t of the rotor core 2 and the side end plate 6 is set as the second space SP2, there is no part connecting the first space SP1 and the second space SP2 except the gap S1. The coil side end K exists in the second space SP2.

[0081] Next, the air passage through which the cooling gas for cooling the rotor 100 flows will be described.

[0082] First, as described above, the first air passage F1 is an air passage formed by the cutout 22 and the retaining ring 3. Figure 5As shown, the axial outer side of the first space SP1 is open to the outside. The cooling gas sucked from the above opening to the axial center side moves from the first space SP1 to the radially outer second space SP2 under the action of centrifugal force through the gap S1 formed between the insulating baffle 8 and the end surface 2t of the rotor core 2.

[0083] At the same time, if Figure 5 As shown in FIG. 1 , the radially inner end faces of the extended portions of the conductors W1 to W6 constituting the coil side end portions K are in contact with the outer peripheral surface 8out of the insulating baffle 8, so the cooling gas entering the second space SP2 from the gap S1 passes through the gap S formed between the adjacent conductors W1 to W6 in the radial direction, first moves in the radial direction, and then moves in the circumferential direction. That is, the gap S between the adjacent conductors W1 to W6 extends outward in the axial direction and then connects to the circumferential left side, so the cooling gas moves as indicated by the arrow.

[0084] Then, when the cooling gas passes over the boundary between the rotor baffle 7 and the insulating baffle 8 and further toward Figure 5 When the conductors W1 to W6 move to the left, the spaces S between the adjacent conductors W1 to W6 are connected to the radially inner space, that is, the space on the outer peripheral side of the rotor baffle 7. Then, the cooling gas flowing through the gaps S formed between the conductors W1 to W6 is as follows. Figure 5 , Fig.12 As shown in the figure, the flows converge in a manner of falling toward the radial inner side and the axial center side.

[0085] As described above, the portion of the partition wall portion 72 where the conductors W1 to W6 exist on the radially outer side, that is, the first tapered portion 72t1, is inclined so as to be separated from the conductors W1 to W6 from the axial end toward the axial center side of the rotor 100. Therefore, the diameter of the axial outer side of the first space SP1 on the radially inner side of the first tapered portion 72t1 is larger than the diameter on the axial center side. As a result, the cross-sectional area of ​​the air passage at the entrance of the first space SP1 can be increased, the ventilation resistance of the cooling gas toward the first space SP1 can be reduced, and the cooling gas can be smoothly sucked in. On the contrary, in the radially outer portion (referred to as the converging portion) of the second space SP2 located on the first tapered portion 72t1, the space expands radially toward the axial center side.

[0086] The cooling gas that flows separately in the gap S between the adjacent conductors W1 to W6 converges toward the axial center, so the amount of cooling gas flowing increases toward the axial center. The first tapered portion 72t1 is formed in the above shape to allow the cooling gas that converges to flow smoothly.

[0087] On the other hand, in the portion from the converging portion to the axial center side of the second space SP2 after all the cooling gases converge, there is no conductor on the radially outer side. Therefore, in this portion, it is not necessary to further expand the radially inner space of the partition wall portion 72, and therefore, the second tapered portion 72t2 is in a shape that expands the radially inner first space SP1 side.

[0088] The cooling gas that converges in the radially outer space of the rotor shroud 7 is discharged from the first air passage F1 to the gap between the rotor 100 and the stator (not shown). In this way, the cooling gas sucked from the first space SP1 is separated from the gap S1 by the gap S between the adjacent conductors W1 to W6 in the second space SP2, flows through the conductors W1 to W6 and converges to the radially outer converging portion of the rotor shroud 7, and is then discharged to the outside. In this way, the heat generated by the coil side end K can be efficiently cooled.

[0089] Next, the flow of cooling gas toward the rotor in-air passage F2 for cooling the conductors W1 to W6 in the rotor core 2 and the rotor core 2 will be described.

[0090] like Figure 7 As shown in FIG. 1 , the inlet of the rotor inner air passage F2 (second air passage) opens toward the axial outer side at a position radially inward of the insulating baffle 8. Figure 6 When the rotor rotates in the rotation direction R indicated by the arrow, the cooling gas is sucked into the first space SP1 from the axial outside as shown by the arrow C, a part of it flows directly into the rotor internal air path F2, and the rest enters the gap S between the conductors W1~W6 from the gap S1 as described above.

[0091] In fact, the cooling gas is also Figure 1 The axial direction shown is Figure 6 The end opposite to the end of the rotor 100 shown flows into the rotor internal air passage F2. The cooling gas flowing into the rotor internal air passage F2 from both axial ends flows through the cooling holes (not shown) of the conductors W1 to W6 under the action of centrifugal force and is released into the air gap between the rotor 100 and the stator (not shown).

[0092] Furthermore, since the rotor internal air passage F2 extends along the conductors W1 to W6 inside the rotor core 2 , the portion of the coil 4 that is a heat source and is accommodated in the slot 21 and the surrounding rotor core 2 can be efficiently cooled.

[0093] In addition, in Patent Document 1, the portion corresponding to the first space SP1 of the present application is separated in the circumferential direction, and the space is not connected over the entire circumference. Therefore, there is a problem that the portion corresponding to the first space SP1 of the present application is separated in the circumferential direction. Figure 5 , Figure 6However, according to the rotor baffle 7 of this embodiment, a first space SP1 is present around the shaft 1 in the retaining ring 3, thereby suppressing the peeling of cooling air on the rotation direction delay side of the rotor baffle 7, and enabling sufficient cooling gas to be supplied to all the rotor internal air passages F2.

[0094] According to the rotor of the rotating electric machine of the first embodiment, the first space SP1 is present all around the shaft 1 of the rotor 100 in the retaining ring 3, so that the separation of the cooling air can be suppressed on the rotation direction delay side of the rotor baffle 7, and sufficient cooling gas can be supplied to all the rotor internal air passages F2. Thus, the rotor 100 of the rotating electric machine with excellent cooling efficiency can be provided.

[0095] In addition, the first conical portion 72t1 of the rotor baffle 7 is inclined from the axial end toward the axial center side of the rotor 100 in a manner separated from the conductors W1 to W6. Therefore, the cross-sectional area of ​​the air path at the entrance of the first space SP1 can be increased, the ventilation resistance of the cooling gas toward the first space SP1 can be reduced, and the cooling gas can be smoothly inhaled.

[0096] In addition, in the radially outer portion (convergence portion) of the second space SP2 located at the first conical portion 72t1, the space expands radially toward the axial center side, so that the cooling gas flowing through the multiple gaps S between the conductors W1 to W6 and converging at the converging portion can be efficiently discharged to the first air path F1.

[0097] Hereinafter, the rotor of the rotating electrical machine according to the second embodiment will be described focusing on the parts different from the first embodiment.

[0098] Fig.13 This is a diagram of the rotor core 202 , the rotor baffle 207 , and the insulating baffle 208 as viewed from the axial direction.

[0099] In Embodiment 1, a two-pole rotor is used for description, and therefore, two rotor baffles 7 and two insulating baffles 8 are included at each end. However, in this embodiment, a four-pole rotor is used, and therefore, the number of rotor baffles 207 and insulating baffles 208 is four at each end.

[0100] In this embodiment, the cross-sectional shape perpendicular to the axial direction of the rotor shroud 207 is set to be an arc shape convex toward the radial inner side. Although the tapered shape toward the axial direction is the same as that of Embodiment 1, the rotor shroud 207 does not include the radially protruding partition 73 used in the rotor shroud 7 of Embodiment 1. As a result, the connection portion of the rotor shroud 207 and the insulating shroud 208 is connected to be inclined in the circumferential direction.

[0101] According to the rotor of the rotating electrical machine of the second embodiment, the rotor baffle 207 and the insulating baffle 208 can be smoothly connected in the circumferential direction at the mutual connection portion, so that the cooling gas can smoothly flow into the rotor internal air passage F202, and the cooling gas can smoothly flow into the second space from the gap S1 between the insulating baffle 208 and the rotor core 202. Thus, the cooling efficiency of the rotor can be improved.

[0102] Hereinafter, the rotor of the rotating electrical machine according to the third embodiment will be described focusing on the parts different from the second embodiment.

[0103] Fig.14 This is a diagram of the rotor core 202 , the rotor baffle 307 , and the insulating baffle 308 as viewed from the axial direction.

[0104] In this embodiment, the cross-sectional shape perpendicular to the axial direction of the rotor shroud 307 is set to a straight line. Although the tapered shape toward the axial direction (in this embodiment, inclined relative to the central axis of the rotating shaft) is the same as that of Embodiment 1, the rotor shroud 307 does not include a partition like the rotor shroud 207 of Embodiment 2. Therefore, the connection portion of the rotor shroud 307 and the insulating shroud 308 is connected to be inclined in the circumferential direction.

[0105] According to the rotor of the rotating electrical machine of the third embodiment, in addition to the same effects as those of the second embodiment, the structure of the rotor baffle 307 can be simplified, and thus the manufacturing cost of the rotor can be reduced.

[0106] Hereinafter, the rotor of the rotating electrical machine according to the fourth embodiment will be described centering on the parts different from the second embodiment.

[0107] Fig.15 This is a diagram of the rotor core 202 , the rotor baffle 407 , and the insulating baffle 408 as viewed from the axial direction.

[0108] In this embodiment, the cross-sectional shape of the rotor shroud 407 perpendicular to the axial direction is set to a mountain shape convex toward the radial inner side. Although the tapered shape toward the axial direction is the same as that of the embodiment 1, the rotor shroud 407 does not include a partition like the rotor shroud 207 of the embodiment 2. Therefore, the connection part of the rotor shroud 407 and the insulating shroud 408 is connected to the circumferential direction at an angle.

[0109] According to the rotor of the rotating electrical machine of the fourth embodiment, in addition to the same effects as those of the second embodiment, the structure of the rotor baffle 407 can be simplified, thereby reducing the manufacturing cost of the rotor and improving the cooling efficiency of the rotor.

[0110] Hereinafter, the rotor of the rotating electrical machine according to the fifth embodiment will be described focusing on the parts different from the second embodiment.

[0111] Fig.16It is a view of the rotor core 202, the rotor baffle 507, and the insulating baffle 508 observed axially.

[0112] In the present embodiment, the cross-sectional shape of the rotor baffle 507 perpendicular to the axial direction is set to a trapezoidal shape that protrudes inward in the radial direction. Although the tapered shape toward the axial direction is the same as that in Embodiment 1, the rotor baffle 507 does not include a partition portion as in the rotor baffle 207 of Embodiment 2. Therefore, the connecting portion between the rotor baffle 507 and the insulating baffle 508 is connected obliquely in the circumferential direction.

[0113] According to the rotor of the rotating electric machine of Embodiment 5, in addition to the same effects as those in Embodiment 2, the structure of the rotor baffle 507 can be simplified. Therefore, the manufacturing cost of the rotor can be reduced, and the cooling efficiency of the rotor can be improved.

[0114] Hereinafter, the rotor of the rotating electric machine of Embodiment 6 will be described centering on the parts different from those in Embodiment 2.

[0115] Fig.17 It is a view of the rotor core 202, the rotor baffle 607, and the insulating baffle 608 observed axially.

[0116] The shape of the rotor baffle 607 is the same as the shape of the rotor baffle 207 described in Embodiment 2. In Embodiment 2, the rotor baffle 207 is uniformly arranged radially inward of the two cuts 22 with respect to the coil side end portions K (not shown), but in the present embodiment, the rotor baffle 607 is arranged offset toward the leading rotation side (Japanese: 回転先側) of the rotor in the rotation direction R with respect to the coil side end portions K, and a gap is provided between the trailing rotation side (Japanese: 回転遅れ側) of the rotor baffle 607 and the rotor internal air passage F202 adjacent to the trailing rotation side.

[0117] According to the rotor of the rotating electric machine of Embodiment 6, in addition to the same effects as those in Embodiment 2, since the position of the rotor baffle 607 is set to be offset toward the leading rotation side of the rotor with respect to the coil side end portions, the influence of the peeling of the cooling gas at the trailing rotation side of the rotor baffle can be avoided, and the suction of the cooling gas into the rotor internal air passage F202 can be smoothly performed. Thereby, the cooling efficiency of the rotor can be improved.

[0118] In addition, an offset arrangement of the rotor baffle in the circumferential direction can also be adopted in other embodiments.

[0119] Hereinafter, the rotor of the rotating electric machine of Embodiment 7 will be described centering on the parts different from those in Embodiments 1 to 6.

[0120] Fig.18 It is a view of the rotor core 202, the rotor baffle 707, and the insulating baffle 708 observed axially.

[0121] The cross-sectional shape of the rotor baffle 607 perpendicular to the axial direction is a wing shape that protrudes radially inward, and the earlier rotating side in the rotation direction R of the rotor protrudes radially inward more than the later rotating side.

[0122] According to the rotor of the rotating electrical machine of Embodiment 7, the cross section of the rotor shroud 707 is a wing-shaped one in which the first rotating side of the rotor greatly protrudes radially inward, so that the cooling gas can be effectively prevented from separating on the second rotating side of the rotor shroud 707. Thus, the cooling efficiency of the rotor can be improved.

[0123] Hereinafter, the rotor of the rotating electrical machine according to the eighth embodiment will be described centering on the parts different from the second to seventh embodiments.

[0124] Fig.19 This is a diagram of the rotor core 202, the rotor baffle 807, and the insulating baffle 808 as viewed from the axial direction.

[0125] In each embodiment described so far, a rotor baffle is provided on the radial inner side of each coil bridge portion. In this embodiment, a rotor baffle 807 is provided separately on the radial inner side of each cutout 22. Therefore, two rotor baffles 807 are provided on the radial inner side of each coil bridge portion, and the second insulating baffle 808b is provided between the two rotor baffles 807. In this way, the rotor baffle does not need to be a single component, and even if a rotor baffle divided into a plurality of parts is used, the same effect as in each embodiment can be achieved.

[0126] The present application describes various exemplary embodiments and examples, but various features, methods, and functions described in one or more embodiments are not limited to application to specific embodiments and can be applied to the embodiments alone or in various combinations.

[0127] Therefore, numerous modifications not shown are contemplated within the technical scope disclosed in this application, including, for example, modifications, additions, or omissions of at least one component, and extraction of at least one component and combination with components of other embodiments.

[0128] (Explanation of symbols)

[0129] 100 rotors;

[0130] 1 axis;

[0131] 2. 202 rotor core;

[0132] 2t end face;

[0133] 21 Grooving;

[0134] 22 incision;

[0135] 3 retaining ring;

[0136] 3in inner circumference;

[0137] 4 coils;

[0138] 6-side end plates;

[0139] 61, 62 edge;

[0140] 7, 207, 307, 407, 507, 607, 707, 807 rotor baffle;

[0141] 71 end member;

[0142] 72 partition wall portion;

[0143] 72t1 first tapered shape portion;

[0144] 72t2 second tapered shape portion;

[0145] 73 partitions;

[0146] 73out end;

[0147] 8, 208, 308, 408, 508, 608, 708, 808 insulation baffles;

[0148] 8out outer surface;

[0149] 808b a second insulating baffle;

[0150] 81 end;

[0151] C arrow;

[0152] K: coil side end;

[0153] O Central axis;

[0154] R: direction of rotation;

[0155] S gap;

[0156] F1 First Wind Road;

[0157] F2, F202 rotor inner air path (second air path);

[0158] S1 gap;

[0159] W1~W6 conductors;

[0160] W1out, W6out outer surface;

[0161] SP1 First Space;

[0162] SP2 Second Space;

[0163] 35 Insulation.

Claims

1. A rotor of a rotating electrical machine, comprising: a shaft; a rotor core; and a coil, wherein the coil is assembled to a slot of the rotor core, wherein: The rotor comprises: a cylindrical retaining ring, the retaining ring covering the coil side end of the coil and the axial outer side of the retaining ring being open; and a rotor baffle and an insulating baffle, wherein the rotor baffle and the insulating baffle are alternately connected in the circumferential direction and divide the space in the retaining ring into a first space on the radially inner side where the coil side end does not exist and a second space on the radially outer side of the circumferential center where the coil side end exists, The rotor baffle is arranged radially inward of a portion of the coil side end where the bridging portion is formed. The insulating baffle is arranged along the radially inner surface of the extension portion of the plurality of conductors constituting the coil side end portion. There is a gap between the end of the insulating baffle on the center side of the rotor and the end surface of the rotor core. The first space is formed around the shaft over the entire circumference. The rotor shroud includes a first tapered portion at a portion of the rotor shroud radially outside where the bridge portion exists, the first tapered portion being inclined toward an axial center side of the rotor so as to be separated from the bridge portion.

2. The rotor of a rotating electrical machine according to claim 1, wherein: The first tapered portion is arranged such that a diameter of the first space on the axially outer side is larger than a diameter of the axially central side.

3. The rotor of a rotating electrical machine according to claim 1, wherein: The rotor shroud includes a second tapered portion that is inclined from an end portion on an axial center side of the first tapered portion toward an axial center side of the rotor so as to approach an outer peripheral surface side of the rotor core.

4. The rotor of a rotating electrical machine according to claim 2, wherein: The rotor shroud includes a second tapered portion that is inclined from an end portion on an axial center side of the first tapered portion toward an axial center side of the rotor so as to approach an outer peripheral surface side of the rotor core.

5. The rotor of a rotating electrical machine according to any one of claims 1 to 4, characterized in that: The rotor baffle includes a first air passage on the radially outer side thereof, wherein the first air passage discharges the gas in the second space to the outside. A second air passage is included radially inside the conductor constituting the coil inserted into the slot, and the second air passage extends in the axial direction.

6. The rotor of a rotating electrical machine according to any one of claims 1 to 4, characterized in that: At the bridge portion, the plurality of conductors overlap each other in the axial direction with gaps therebetween.

7. The rotor of a rotating electrical machine according to claim 5, wherein: At the bridge portion, the plurality of conductors overlap each other in the axial direction with gaps therebetween.

8. The rotor of a rotating electrical machine according to any one of claims 1 to 4 and claim 7, characterized in that The cross-sectional shape of the rotor baffle perpendicular to the axial direction is any one of the following shapes: A shape having an arc portion concentric with an axial cross section perpendicular to the outer peripheral surface of the rotor core and a straight portion extending radially outward from both circumferential ends of the arc portion; Straight line; An arc shape convex toward the radial inside; A ">" shape formed by two straight lines protruding radially inward; A trapezoidal shape convex toward the radial inside; as well as The wing shape is convex toward the radial inside, and the earlier rotating side in the rotation direction of the rotor protrudes more toward the radial inside than the later rotating side.

9. The rotor of a rotating electrical machine according to claim 5, wherein: The cross-sectional shape of the rotor baffle perpendicular to the axial direction is any one of the following shapes: A shape having an arc portion concentric with an axial cross section perpendicular to the outer peripheral surface of the rotor core and a straight portion extending radially outward from both circumferential ends of the arc portion; Straight line; An arc shape convex toward the radial inside; A ">" shape formed by two straight lines protruding radially inward; A trapezoidal shape convex toward the radial inside; as well as The wing shape is convex toward the radial inside, and the earlier rotating side in the rotation direction of the rotor protrudes more toward the radial inside than the later rotating side.

10. The rotor of a rotating electrical machine according to claim 6, wherein: The cross-sectional shape of the rotor baffle perpendicular to the axial direction is any one of the following shapes: A shape having an arc portion concentric with an axial cross section perpendicular to the outer peripheral surface of the rotor core and a straight portion extending radially outward from both circumferential ends of the arc portion; Straight line; An arc shape convex toward the radial inside; A ">" shape formed by two straight lines protruding radially inward; A trapezoidal shape convex toward the radial inside; as well as The wing shape is convex toward the radial inside, and the earlier rotating side in the rotation direction of the rotor protrudes more toward the radial inside than the later rotating side.

11. The rotor of a rotating electrical machine according to any one of claims 1 to 4, claim 7, and claims 9 to 10, characterized in that: The rotor baffle is disposed so as to be offset from the coil side end portion toward the earlier rotating side in the rotation direction of the rotor.

12. The rotor of a rotating electrical machine according to claim 5, wherein: The rotor baffle is disposed so as to be offset from the coil side end portion toward the earlier rotating side in the rotation direction of the rotor.

13. The rotor of a rotating electrical machine according to claim 6, wherein: The rotor baffle is disposed so as to be offset from the coil side end portion toward the earlier rotating side in the rotation direction of the rotor.

14. The rotor of a rotating electrical machine according to claim 8, wherein: The rotor baffle is disposed so as to be offset from the coil side end portion toward the earlier rotating side in the rotation direction of the rotor.

15. The rotor of a rotating electrical machine according to any one of claims 1 to 4, 7, 9 to 10, and 12 to 14, characterized in that: A plurality of the rotor baffles are arranged radially inside one of the bridging portions.

16. The rotor of a rotating electrical machine according to claim 5, wherein: A plurality of the rotor baffles are arranged radially inside one of the bridging portions.

17. The rotor of a rotating electrical machine according to claim 6, wherein: A plurality of the rotor baffles are arranged radially inside one of the bridging portions.

18. The rotor of a rotating electrical machine according to claim 8, wherein: A plurality of the rotor baffles are arranged radially inside one of the bridging portions.

19. The rotor of a rotating electrical machine according to claim 11, wherein: A plurality of the rotor baffles are arranged radially inside one of the bridging portions.

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