rotating electrical machines

Abstract

To provide a rotary electric machine capable of suppressing the influence of heat on a member.SOLUTION: A rotary electric machine 1 according to an embodiment includes a frame 2 housing a stator 4 and a rotor 5, a bracket 3 that closes the opening of the frame 2, a shaft 6 fixed to and rotating with the rotor 5, a bearing 7 that rotatably supports the shaft 6, and a radiator 8 mounted on the shaft 6 between the rotor 5 and the bearing 7 in the axial direction and having a heat radiation surface 8a facing the inner surface of the bracket 3.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] An embodiment of the present invention relates to a rotating electric machine. [Background technology]

[0002] BACKGROUND ART Conventionally, in a rotating electric machine in which a stator and a rotor are arranged in a frame, a fan is sometimes provided for cooling (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2019-54650 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, conventionally, cooling has been performed based on the technical idea of ​​cooling the components to which heat has been transferred, making it difficult to suppress the influence of heat itself on the components. Therefore, a rotating electrical machine capable of suppressing the influence of heat on components is provided. [Means for solving the problem]

[0005] The rotating electric machine of the embodiment comprises a frame that houses a stator and a rotor, a bracket that covers an opening in the frame, a shaft that is fixed to the rotor and rotates together with it, a bearing that rotatably supports the shaft, and a heat sink that is attached to the shaft between the rotor and the bearing in the axial direction and has a heat dissipation surface facing the inner surface of the bracket. [Brief explanation of the drawings]

[0006] [Figure 1] FIG. 1 is a diagram illustrating a configuration example of a rotating electric machine according to a first embodiment; [Figure 2] FIG. 1 is a diagram showing a schematic configuration example of a heat sink; [Figure 3] FIG. 1 is a diagram illustrating a configuration example of a shielding member; [Figure 4] FIG. 10 is a diagram schematically illustrating another example of the configuration of a rotating electric machine. [Figure 5] FIG. 10 is a diagram schematically illustrating another example of the configuration of a heat sink. [Figure 6] 10A and 10B are diagrams schematically illustrating other configuration examples and attachment modes of the shielding member; [Figure 7] FIG. 10 is a diagram illustrating a configuration example of a rotating electric machine according to a second embodiment. [Figure 8] FIG. 1 is a diagram schematically illustrating an example of the configuration of a shielding heat transfer member; [Figure 9] FIG. 10 is a diagram schematically illustrating another configuration example of a shielding heat transfer member. [Figure 10] 10A and 10B are diagrams schematically illustrating other examples of arrangement of the shielding and heat transfer members; DETAILED DESCRIPTION OF THE INVENTION

[0007] Hereinafter, several embodiments will be described with reference to the drawings. Furthermore, parts that are substantially common to the embodiments are given the same reference numerals.

[0008] (First embodiment) A first embodiment will be described below. As shown in Fig. 1, a rotating electric machine 1 includes a frame 2 formed in a cylindrical shape with both ends open, brackets 3A and 3B that close the openings on both ends of the frame 2, a stator 4 fixed to the inner surface of the frame 2, a rotor 5 that is disposed on the inner circumferential side of the stator 4 with a predetermined gap therebetween, a shaft 6 attached to the rotor 5, bearings 7 that are provided on each bracket 3 and rotatably support the shaft 6, and a heat radiator 8 fixed to the shaft 6. Hereinafter, the direction along the rotation axis (J1) of the shaft 6 will be referred to as the axial direction, the direction perpendicular to the axial direction will be referred to as the radial direction, and the direction around the axial direction will be referred to as the circumferential direction.

[0009] In this embodiment, the frame 2 has an inner peripheral surface formed in a circular cylindrical shape, and is provided with a fixing structure (not shown) on the inner peripheral surface for fixing the stator 4. The bracket 3 houses the bearing 7 and is formed in a roughly disk shape that spreads radially outward from the bearing 7 side, with a flat surface 3a formed on at least a portion of its inner surface in the circumferential direction.

[0010] As is well known, the stator 4 is hollow and made by laminating iron core pieces punched into annular shapes from electromagnetic steel sheets, and has multiple slots formed on its inner circumferential surface for fitting coils. The coils inserted into the slots have portions that protrude on both axial ends and are shaped along the end faces of the stator 4 to form coil ends 4a. The coil ends 4a are formed to fit into a predetermined shape in the axial and radial directions.

[0011] As is well known, the rotor 5 is formed by laminating iron core pieces punched into annular shapes from electromagnetic steel sheets, and has a hole 5a formed in the center thereof for inserting the shaft 6. In this embodiment, an induction-type rotating electric machine 1 is assumed, and the rotor 5 has conductors such as aluminum or copper inserted into multiple slots formed inside, and short-circuit rings 5b connecting the conductors at both ends in the axial direction are formed in a shape with fins. However, the configuration of the rotating electric machine 1 is one example and is not limited to this.

[0012] The shaft 6 is made of a metal material, is press-fitted into the hole 5a of the rotor 5, and rotates around the rotation axis that rotates together with the rotor 5. In addition, the shaft 6 has steps formed at positions corresponding to both sides of the rotor 5, where the diameter is relatively smaller on the side opposite the rotor 5 in the axial direction, and these steps determine the position where the heat sink 8 is attached.

[0013] The heat sink 8 is made of a metal material such as stainless steel, and is fixed to the shaft 6 at a position axially between the rotor 5 and the bearing 7. The heat sink 8 is formed in a shape that spreads radially outward from the shaft 6 side, and has a flat heat sink surface 8a that faces the inner surface of the bracket 3, in this case the flat surface 3a. Hereinafter, the portion where the heat sink surface 8a is formed will be referred to as the heat sink portion 8b for convenience.

[0014] Specifically, as shown in Fig. 2, the heat sink 8 has a circular outer shape when viewed from the front in the axial direction, and an insertion hole 8c is formed in the center thereof, into which the shaft 6 is inserted. A key groove 8d, into which the key of the shaft 6 is inserted, is formed in part of the circumferential direction of the insertion hole 8c, thereby preventing misalignment relative to the shaft 6. In this embodiment, the heat sink 8 is also provided with a fixing hole 6e that communicates from the radial outside to the inner surface of the insertion hole 8c, and is fixed to the shaft 6 by, for example, a bolt. However, a configuration in which the heat sink 8 is fixed only by press fitting or only by bolts may also be used.

[0015] Furthermore, as shown in a side view from the radial direction, the radiator 8 is shaped so that the right side in the drawing, which is the stator 4 and rotor 5 side, does not interfere with the short-circuit ring 5b or the coil end 4a. In this embodiment, the radiator 8 is formed in a stepped shape to avoid the short-circuit ring 5b and the coil end 4a. Furthermore, the radiator 8 has a recess 8e recessed from the surface by a predetermined diameter on the surface on the right side in the drawing, which is the bearing 7 side, so as not to interfere with the bearing 7. The flat surface formed on the outer periphery of the recess 8e becomes the heat dissipation surface 8a in this embodiment.

[0016] The heat sink 8 is formed, for example, by cutting out a short cylindrical metal material, and the surface on the left side in the figure continues from the insertion hole 8c side to the outer edge of the heat dissipation surface 8a. When the heat sink 8 is attached to the shaft 6, the insertion hole 8c is closed by the shaft 6. Therefore, when the heat sink 8 is attached to the shaft 6, a flange-shaped heat dissipation portion 8b is formed at the end on the left side in the figure, and the surface of this flange-shaped heat dissipation portion 8b forms a cylindrical structure with a bottom, which serves as the heat dissipation surface 8a.

[0017] 1, the heat sink 8 is sized so that, when viewed from the axial direction, the outer edge of the heat sink 8b, indicated by the dashed dotted line (DL1), overlaps in the radial direction with the inner edge, indicated by the dashed dotted line (DL2), of the coil end 4a formed at the axial end of the stator 4. Therefore, the heat sink surface 8a of the heat sink 8 is parallel to the flat surface 3a of the bracket 3 with a predetermined gap therebetween, that is, it faces the flat surface 3a. Furthermore, when the shaft 6 rotates and the heat sink 8 rotates, the heat sink surface 8a and the flat surface 3a also face each other with a predetermined gap therebetween.

[0018] The diameter (R1) of the insertion hole 8c of the heatsink 8 can be set based on the diameter of the shaft 6. The diameter (R2) of the first step from the right of the heatsink 8 in the figure and the diameter (R3) of the second step can be set to a size that does not contact the short-circuit ring 5b or the coil end 4a and ensures a predetermined insulation distance. However, it is desirable to make the diameter (R2) of the first step as large as possible, because it is the part that contacts the shaft 6 and transfers heat from the shaft 6.

[0019] The overall diameter (R4) of the heat sink 8 can be set appropriately depending on the size of the frame 2 and the internal structure of the frame 2. The diameter (R5) of the recess 8e is preferably set to a range that does not interfere with the bearing 7 and that allows the width (W1) of the heat sink surface 8a, which is the portion that releases heat to the bracket 3 as described below, to be as large as possible.

[0020] The overall thickness (T1) of the heat sink 8 can be set depending on factors such as the distance between the rotor 5 and the bearing 7, but it is desirable to set it so that the distance between the heat sink surface 8a and the flat surface 3a is as short as possible. The thickness (T2) of the heat sink portion 8b is desirably made as thick as possible to maximize the amount of heat storage while still ensuring a predetermined insulation distance between the coil end 4a and the heat sink. The thickness (T3) of the insertion hole 8c, i.e., the axial length of the insertion hole 8c, is desirably made as thick as possible because it is the portion that contacts the shaft 6 and transfers heat from the shaft 6.

[0021] 1, a shielding member 9 is provided on the surface of this heat dissipation portion 8b facing the coil end 4a. This shielding member 9 blocks at least a portion of the direct heat radiation from the coil end 4a to the heat dissipation device 8, and is made of a heat-resistant material with relatively low thermal conductivity compared to the heat dissipation device 8. In this embodiment, the shielding member 9 is made of a heat-resistant rubber material, and a highly reflective member such as aluminum foil is attached to the surface facing the coil end 4a.

[0022] The shielding member 9 is attached to the surface of the heat dissipation portion 8b on the coil end 4a side with, for example, a heat-resistant adhesive. However, the shielding member 9 is not limited to being made of rubber, but can be made of a heat-resistant resin material or the like, and can be attached to the heat dissipation portion 8b by, for example, screwing from the shielding member 9 side or the heat dissipation surface 8a side, or by both adhesive and screwing.

[0023] 3, the shielding member 9 has an outer diameter (R10) that is approximately the same as or slightly smaller than the diameter (R1) of the heatsink 8, an inner diameter (R7) that is slightly larger than the diameter (R3) of the second stage of the heatsink 8, and a thickness (T10) that is approximately the same as the thickness (T2) of the heatsink portion 8b. Therefore, when attached to the heatsink portion 8b, the shielding member 9 shields almost the entire radial and circumferential area of ​​the heatsink portion 8b from the coil end 4a side.

[0024] In other words, the shielding member 9 blocks at least a portion of the direct heat radiation from the coil end 4a to the heat radiator 8, and in the case of this embodiment, it blocks the direct heat radiation to the heat radiating portion 8b of the heat radiator 8. Note that the shielding member 9 is not limited to being annular as shown in Fig. 3, but may be configured, for example, by combining a plurality of pieces divided in the circumferential direction.

[0025] Next, the operation of the above-described configuration will be described. As mentioned above, conventional cooling methods were based on the technical idea of ​​cooling components to which heat was transferred, making it difficult to suppress the effects of heat on components themselves. For example, if the coil generates heat during operation, the heat is transferred to shaft 6, and then to bearing 7 via shaft 6. If excessive heat is transferred to bearing 7, there is a risk of damage due to dimensional deviation caused by thermal expansion or deterioration of the lubricating oil.

[0026] Therefore, in this embodiment, a heat sink 8 is provided in the rotating electric machine 1. For example, as shown as a comparative example in Fig. 4, in the case of a conventional rotating electric machine 101 that does not have a heat sink 8, when heat, as schematically indicated by the white arrow (V1), is conducted to the shaft 6, the heat is conducted almost directly to the bearing 7. As a result, the heat is conducted to the bearing 7 that physically supports the shaft 6, and the temperature of the bearing 7 rises, which may cause the damage described above.

[0027] In contrast to this, in the case of the rotating electric machine 1 according to this embodiment shown as an example, even if the heat indicated by the white arrow (V1) is conducted to the shaft 6, a portion of the heat is conducted to the heat sink 8 as indicated by the white arrow (V2), and the remainder is conducted to the bearing 7 side as indicated by the white arrow (V3). Then, the heat conducted to the heat sink 8 is conducted by radiation from the heat dissipation surface 8a to the bracket 3 as indicated by the white arrow (V4), and is released to the outside from the outer surface of the blanket.

[0028] As a result, the rotating electric machine 1 of this embodiment can reduce the heat transferred to the bearing 7 compared to the conventional rotating electric machine 101, that is, can suppress the thermal effect itself on the bearing 7. If the thermal effect on the bearing 7 is suppressed, the temperature rise of the bearing 7 is also suppressed, and therefore the risk of the above-mentioned damage can be reduced.

[0029] Incidentally, the coil end 4a is a part of the rotating electric machine 1 that becomes relatively hot, and radiant heat is emitted from the coil end 4a as indicated by the black arrow (R1). In this case, if the temperature of the heat dissipation portion 8b rises due to the radiant heat, the heat dissipation performance from the heat dissipation surface 8a may be reduced, and the amount of heat removed from the shaft 6 may also be reduced. For this reason, the rotating electric machine 1 is provided with a shielding member 9 on the coil end 4a side of the heat dissipation portion 8b, which is located axially to the side of the coil end 4a. This makes it possible to prevent a reduction in heat dissipation from the heat dissipation portion 8b due to heat radiation from the coil end 4a.

[0030] According to the embodiment described above, the following effects can be obtained. The rotating electric machine 1 includes a frame 2 that houses a stator 4 and a rotor 5, a bracket 3 that closes an opening in the frame 2, a shaft 6 that is fixed to the rotor 5 and rotates therewith, a bearing 7 that rotatably supports the shaft 6, and a radiator 8 that is attached to the shaft 6 between the rotor 5 and the bearing 7 in the axial direction and has a heat dissipation surface 8a that faces the inner surface of the bracket 3. This allows heat transferred to the shaft 6 to be released before it is transferred to components that make up the rotating electric machine 1, such as the bearing 7, and the effect of heat on the components themselves can be suppressed.

[0031] Furthermore, in the rotating electric machine 1, the heat sink 8 is sized so that the outer edge of the heat sink surface 8a overlaps the inner edge of the coil end 4a when viewed in the axial direction. In other words, the heat sink surface 8a is sized to extend somewhat radially. This allows the area where the heat sink surface 8a faces the blanket to be increased, increasing the amount of heat dissipated from the heat sink surface 8a to the blanket and improving the heat dissipation performance of the heat sink 8. The heat sinks 8 can be attached to both sides of the rotor 5 in the axial direction by threading the shaft 6 and the heat sink 8, for example.

[0032] The rotating electric machine 1 also includes a shielding member 9 that is attached to the coil end 4a side of the radiator 8 and blocks at least a portion of the direct heat radiation from the coil end 4a to the radiator 8. This prevents the heat from the coil end 4a, which becomes relatively hot during operation, from being transferred to the radiator 8, and prevents a decrease in the heat dissipation performance of the radiator 8.

[0033] In the embodiment, the radiator 8 has been illustrated as having multiple steps on the outer periphery. However, it is also possible to use a configuration without steps on the outer periphery, such as the radiator 8A shown as shape example 1 in FIG. 5. This makes it easier to ensure an insulation distance from the coil end 4a. Furthermore, if the rotor 5 does not have a fin-shaped portion, the amount of heat transferred from the shaft 6 can be increased by ensuring an insulation distance from the coil end 4a and increasing the width (W10) in cross section of the portion that contacts the shaft 6 as much as possible. In other words, the heat from the shaft 6 can be efficiently released from the heat dissipation surface 8a.

[0034] Also, as in the heat sink 8B shown as a second shape example, the outer edge on the coil end 4a side and the inner edge on the bearing 7 side can be configured to be inclined. In this case, either the outer edge or the inner edge can be configured to be inclined. Also, as in the heat sink 8C shown as a third shape example, in a structure in which the bearing 7 is disposed outside the inner surface of the blanket, a simple configuration can be used in which a flange-shaped heat dissipation portion 8b is provided on a generally cylindrical main body. Such configurations also ensure the insulation distance from the coil end 4a and the heat dissipation surface area 8a, and are easy to manufacture.

[0035] Furthermore, although the embodiment has been described with reference to a configuration in which the shielding member 9 is provided on the surface of the heat dissipation portion 8b facing the coil end 4a, it is also possible to configure a configuration in which shielding members 9A and 9B of different sizes are attached to the stepped portion of the heat dissipation portion 8b, as shown in attachment example 1 in Fig. 6. Furthermore, as shown in attachment example 2, it is also possible to configure a configuration in which shielding members 9C and 9D are provided to cover the stepped portion of the heat dissipation portion 8 from the radially outer side, thereby blocking heat radiation from the coil end 4a on at least one of the axial and radially outer sides.

[0036] Furthermore, as shown in installation example 3, other structures such as the heat sink 8A can also be configured to block heat radiation from the coil end 4a on at least one of the axial and radial outer sides. Also, a shielding member 9 can be provided in the recess 8e. This blocks direct heat radiation from the heat sink 8 to the bearing 7, thereby suppressing a temperature rise in the bearing 7.

[0037] In this way, by configuring the shielding member 9 to be located at a position opposite the coil end 4a, direct heat radiation from the coil end 4a to the heat sink 8 can be blocked, and in the heat sink 8, heat dissipation from the position where the shielding member 9 is located is suppressed, thereby relatively increasing the amount of heat dissipated from the heat dissipation surface 8a, and improving the efficiency of heat transfer to the bracket 3, that is, the heat dissipation efficiency via the bracket 3.

[0038] In the embodiment, it has been described that the influence of heat on the bearings 7 is suppressed, but it is also possible to suppress the influence of heat on members attached to the shaft 6 outside the rotating electric machine 1. In other words, the heat sink 8 can suppress the influence of heat on the members that make up the rotating electric machine 1 and the members that are attached to the shaft 6. Furthermore, in the embodiment, a configuration in which the heat sinks 8 are provided on both sides of the rotor 5 has been exemplified, but a configuration in which the heat sink 8 is provided on either side is also possible.

[0039] (Second embodiment) The second embodiment will be described below. Since the main configuration of the rotating electrical machine 1 of the second embodiment is the same as that of the first embodiment, the same reference numerals are used for the substantially same parts, and detailed description thereof will be omitted.

[0040] As shown in Fig. 7, a rotating electric machine 10 of this embodiment includes a frame 2, brackets 3A and 3B, a stator 4, a rotor 5, a shaft 6, a bearing 7, a heat sink 8, and a shielding heat transfer member 11 attached to the inner surface of the frame 2. As shown in Fig. 8, this shielding heat transfer member 11 has a shielding plate 11a formed in a hollow annular shape and a wall portion 11b rising from the outer edge of the shielding plate 11a and extending in the axial direction, and has a generally L-shaped cross section. This shielding heat transfer member 11 is made of a heat-conductive material, such as a metal material.

[0041] In this case, the overall diameter of the shielding heat transfer member 11 is set to a size that allows it to be attached to the inner surface of the frame 2. The axial width (W20) of the wall portion 11b can be set appropriately within a range that allows it to be attached to the inner surface of the frame 2. Screw holes 11c are formed in multiple locations on this wall portion 11b for fixing it to the inner surface of the frame 2. The radial width (W21) of the shielding plate 11a is set to a range that does not contact the heat radiator 8 when attached to the frame 2.

[0042] 7, the shielding heat transfer member 11 is attached by fixing the wall portion 11b to the frame 2 with the shielding plate 11a positioned between the coil end 4a and the heat radiator 8 in the axial direction. However, a predetermined insulation distance is ensured between the shielding heat transfer member 11 and the coil end 4a. As a result, the radiation heat from the coil end 4a indicated by the black arrow (R1) is blocked by the shielding heat transfer member 11 from being radiated to the heat radiator 8, in this case, the heat radiating portion 8b.

[0043] In this way, by providing a shielding heat transfer member 11 that is attached to the frame 2 and positioned between the heat radiator 8 and the coil end 4a to block at least a portion of the direct heat radiation from the coil end 4a to the heat radiator 8, and that transfers the heat received from the coil end 4a to the frame 2, the temperature rise of the heat radiating portion 8b can be suppressed, and since it becomes easier to release the heat transferred from the shaft 6 to the bracket 3, the thermal impact on the member itself can be suppressed.

[0044] The shielding heat transfer member 11 is not limited to the annular shape described above, and can be configured to block heat radiation in a generally annular shape by combining multiple pieces. For example, as shown in shape example 1 in Fig. 9, the shielding heat transfer member 11 shown in Fig. 8 can be configured by combining parts 12A obtained by dividing the shielding heat transfer member 11 in the circumferential direction. Note that in Fig. 9, for the sake of explanation, reference numerals are assigned to positions corresponding to the shielding plate 11a and the wall portion 11b. In this case, the central angle (α) of the parts 12A can be set appropriately, but parts of the same shape do not necessarily need to be arranged. For example, parts with central angles of 30 degrees, 45 degrees, and 60 degrees can be combined to form the shielding heat transfer member 11.

[0045] Alternatively, as shown in Shape Example 2, the shielding heat transfer member 11 can have a wall portion 11b formed in a straight line, and a part 12B shaped like a circular arc on the bottom end side of the shielding plate 11a connected to the wall portion 11b, that is, on the radiator 8 side, so as to avoid the radiator 8. Furthermore, as shown in Shape Example 3, the shielding heat transfer member 11 can also be configured using a part 12C shaped by dividing the part shown in Shape Example 2 in half in the left-right direction in the figure.

[0046] Furthermore, as shown in shape example 4, the shielding heat transfer member 11 can be configured by using a part 12D in which the wall portion 11b side and the shielding plate 11a side are separate members, and the two are screwed together to attach them to the inner surface of the frame 2, or by attaching the wall portion 11b to the inner surface of the frame 2 in advance, and then attaching the shielding plate 11a after the necessary work has been completed.

[0047] By configuring the shielding heat transfer member 11 from multiple parts 12 in this way, and by making it possible to combine wall portions 11b and shielding plates 11a with different shapes, it is possible to arrange the shielding heat transfer member 11 to provide generally annular shielding between the coil end 4a and the heat sink 8 (not shown) by combining multiple parts 12 or parts 12 with different shapes, even in cases where the inner surface of the frame 2A is not perfectly circular, as in the rotating electric machine 20 shown in Figure 10, or where there is a structure 21 that is difficult to avoid due to the structure, such as a portion where a terminal is pulled out.

[0048] In this case, the parts 12 can be arranged without gaps in the circumferential direction, but gaps may exist between the parts 12 as shown in Fig. 10. This is because, since the radiator 8 rotates, it is thought that there is little risk that the same part of the radiator 8 will continue to be heated by heat radiation from the gaps.

[0049] Furthermore, in combination with the rotating electric machine 1 of the first embodiment, a configuration can be adopted in which a shielding member 9 and a shielding heat transfer member 11 are provided. In this case, the shielding member 9 can be provided when the distance between the coil end 4 a and the heat radiator 8 is relatively short, as on the left side of the rotating electric machine 1 shown in FIG. 1 , and the shielding member 9 and the shielding heat transfer member 11 can be provided when the distance between the coil end 4 a and the heat radiator 8 is relatively long, as on the right side of the figure. For example, in the assembly order in which the rotor 5 and the shaft 6 are inserted into the inner periphery of the stator 4 fixed to the frame 2, the heat radiator 8 can be easily disposed on one axial side of the rotor 5 by not providing the heat radiator 8 on the leading end side in the insertion direction but by inserting the rotor 5 with the heat radiator 8 attached in advance on the trailing end side in the insertion direction.

[0050] Furthermore, in a case where a heat sink 8 is provided on one of the axial sides and no heat sink 8 is provided on the other side, a shielding heat transfer member 11 can be provided on the side where no heat sink 8 is provided. This promotes heat dissipation from the coil end 4a via the shielding heat transfer member 11 to the outer surface of the frame 2, making it possible to relatively reduce the heat transferred to the shaft 6 side and suppressing the heat transferred through the shaft 6 from affecting other components.

[0051] Although several embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be embodied in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are included within the scope and spirit of the invention, and are also included in the scope of the invention and its equivalents as defined in the claims. [Explanation of symbols]

[0052] In the drawings, 1 and 10 indicate rotating electric machines, 2 and 2A indicate frames, 3, 3A and 3B indicate brackets, 3a indicates a flat surface, 4 indicates a stator, 4a indicates a coil end, 5 indicates a rotor, 6 indicates a shaft, 7 indicates a bearing, 8, 8A, 8B and 8C indicate heat sinks, 8a indicates a heat dissipation surface, 9, 9A, 9B, 9C, 9D, 9E and 9F indicate shielding members, 11 indicates a shielding heat transfer member, and 12A, 12B, 12C and 12D indicate parts (shielding heat transfer members).

Claims

1. a frame that houses the stator and rotor; a bracket that closes the opening of the frame and has an inner surface that is formed with a flat surface on at least a portion of its circumferential surface; a shaft fixed to the rotor for rotation therewith; a bearing that rotatably supports the shaft; a radiator attached to the shaft between the rotor and the bearing in the axial direction, the radiator having an annular heat dissipation surface facing the flat surface of the bracket in the axial direction, The radiator rotates with the rotation of the shaft, with the heat dissipation surface facing the flat surface at a predetermined distance in the axial direction.

2. The stator has coil ends formed at its axial ends, 2. The rotating electric machine according to claim 1, wherein the heat radiator is formed to a size such that an outer edge of the heat radiating surface overlaps an inner edge of the coil end when viewed in the axial direction.

3. The stator has coil ends formed at its axial ends, 3. The rotating electric machine according to claim 1, further comprising a shielding member attached to the radiator on the coil end side, for blocking at least a portion of direct heat radiation from the coil end to the radiator.

4. The stator has coil ends formed at its axial ends, 4. The rotating electric machine according to claim 1, further comprising a shielding heat transfer member attached to the frame, positioned between the radiator and the coil end, blocking at least a portion of direct heat radiation from the coil end to the radiator, and transferring heat received from the coil end to the frame.

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