Rotating Electric Machine

Abstract

To provide a rotary electric machine capable of improving a cooling effect in a full closed structure type.SOLUTION: A rotary electric machine comprises: a first fan 75a and a second fan 75b disposed at both sides of a rotor 72; and a first stator core 30a and a second stator core 30b which are separated in an axial direction and between which an annular interval piece 51 and a plurality of tabular interval pieces 52 are disposed. In the first stator core 30a, a first ventilation hole 35a is formed outside of a groove part 32 formed on an inner peripheral surface of a stator core 30 and in the second stator core 30b, a second ventilation hole 35b is formed outside of a groove part 32 different from the groove part 32 where the first ventilation hole 35a is formed. A first ventilation duct 15a opened in the first fan 75a and the first ventilation hole 35a is formed in a first bracket 10a supporting the first stator core 30a, and a second ventilation duct 15b opened in the second fan 75b and the second ventilation hole 35b is formed in a second bracket 10b supporting the second stator core 30b.SELECTED DRAWING: Figure 1

Description

[Technical field]

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

[0002] Induction motors, wound-type generators, and permanent magnet rotating electric machines are used as rotating electric machines for railway vehicles. Since rotating electric machines generate heat during operation, they are equipped with a cooling structure to suppress temperature rise. Proposed cooling structures include a totally enclosed structure that mainly dissipates heat from the main body of the rotating electric machine, a self-ventilation type that has a fan installed on the rotating shaft to take in outside air, and a forced air cooling type that connects a blower to send in outside air.

[0003] For example, the electric motor described in Patent Document 1 has an axially extending ventilation hole and a first ventilation passage extending radially from the ventilation hole formed in the rotor core, and a second ventilation passage extending radially formed in the stator core. As a result, when the electric motor described in Patent Document 1 is in operation, the rotor core and stator core are cooled by cooling air that flows through the ventilation hole, the first ventilation passage, and the second ventilation passage as the rotor core rotates, improving the cooling efficiency of the rotor core and stator core. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2010-178532 A Summary of the Invention [Problem to be solved by the invention]

[0005] The totally enclosed rotating electric machine has an advantage in that it is structured to separate the inside of the rotating electric machine from the outside, and therefore does not require maintenance work such as cleaning the inside of the machine. However, in the case of a totally enclosed rotating electric machine, since the inside of the machine is separated from the outside, it is not possible to take in outside air into the machine, and therefore the cooling effect is lower than that of a self-ventilation type or a forced air-cooling type.

[0006] Generally, in rotating electric machines, the coil inside the stator core arranged in the stator is one of the locations where the temperature is likely to become high. Therefore, in order to improve the cooling effect, it is effective to reduce the temperature of the coil inside the stator core, but in a totally enclosed structure type, the coil inside the stator core cannot be cooled using outside air, so there is room for improvement in the cooling structure of totally enclosed structure type rotating electric machines.

[0007] The present invention has been made in view of the above, and has an object to provide a rotating electric machine that can improve the cooling effect in a totally enclosed structure. [Means for solving the problem]

[0008] A rotating electric machine according to an embodiment includes a rotor attached to a rotating shaft, a stator core having a first stator core and a second stator core that are arranged apart from each other in the axial direction of the rotating shaft and are arranged radially outwardly of the rotor, and a duct forming member that is arranged between the first stator core and the second stator core and is connected to the first stator core and the second stator core, and a stator core that is arranged on the opposite side to the side where the second stator core is located with respect to the first stator core in the axial direction to support the first stator core and a first bracket supporting a rotating shaft rotatably relative to the first stator core, a second bracket arranged on the opposite side of the first stator core relative to the second stator core in the axial direction to support the second stator core and supporting the rotating shaft rotatably relative to the second stator core, a first fan arranged on the side of the rotor where the first bracket is located in the axial direction to rotate integrally with the rotating shaft, and the second bracket located relative to the rotor in the axial direction a second fan disposed on the first stator core side and rotating integrally with the rotating shaft, a groove portion extending in the axial direction across the first stator core and the second stator core is formed on an inner peripheral surface of the stator core, a plurality of the groove portions are disposed in the circumferential direction of the stator core, stator coils are housed in the plurality of the groove portions, the duct forming member is disposed around the entire circumference of the stator core at an outer end position of the stator core in the radial direction, and both sides in the axial direction are connected to the first stator core and the second stator core; and a plate-like spacing piece formed in a plate-like shape and arranged with the width direction of the plate aligned with the axial direction and the thickness direction of the plate aligned with the circumferential direction, both sides in the axial direction being connected to the first stator core and the second stator core, and an outer end in the radial direction being connected to the annular spacing piece, a plurality of the plate-like spacing pieces being radially arranged between the respective grooves, the first stator core being formed with first ventilation holes penetrating the first stator core in the axial direction at positions outside the grooves in the radial direction, and the second stator core being formed withA second ventilation hole penetrating the second stator core in the axial direction is formed at a radially outer position of the groove portion different from the circumferential position of the groove portion on the radially outer side of the first stator core where the first ventilation hole is formed, a first ventilation duct is formed in the first bracket, one end of which opens from the radially outer side of the first fan to a position facing the radial outer end of the first fan and the other end of which opens to a position facing the first ventilation hole, and a second ventilation duct is formed in the second bracket, one end of which opens from the radially outer side of the second fan to a position facing the radial outer end of the second fan and the other end of which opens to a position facing the second ventilation hole. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a half cross-sectional view of a rotating electric machine according to an embodiment. [Diagram 2] FIG. 2 is a cross-sectional view taken along line AA in FIG. [Diagram 3] FIG. 3 is a cross-sectional view taken along line BB of FIG. [Figure 4] FIG. 4 is a cross-sectional view taken along line CC of FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Exemplary embodiments of the present invention are disclosed below. The configurations of the embodiments described below and the actions and effects brought about by the configurations are merely examples. The present invention can be realized by configurations other than those disclosed in the following embodiments. Furthermore, according to the present invention, it is possible to obtain at least one of the various effects (including derivative effects) obtained by the configurations.

[0011] Hereinafter, an example of a rotating electric machine according to this embodiment will be described with reference to the accompanying drawings.

[0012] [Embodiment] 1 is a half cross-sectional view of a rotating electric machine 1 according to an embodiment. The rotating electric machine 1 according to the embodiment has a rotating shaft 70, a rotor 72 attached to the rotating shaft 70, a stator 20, and a bracket 10 supporting the stator 20. In the following description, the axial direction of the rotating shaft 70 of the rotating electric machine 1 will be described as the axial direction of the rotating electric machine 1, and the radial direction of the rotating shaft 70 will be described as the radial direction of the rotating electric machine 1. The outer side in the radial direction refers to the side away from the axis of the rotating shaft 70 in the radial direction, and the inner side in the radial direction refers to the side approaching the axis of the rotating shaft 70 in the radial direction. The circumferential direction refers to the direction around the rotating shaft 70.

[0013] The rotating shaft 70 is a shaft-shaped rotating member in the rotating electric machine 1. One end of the rotating shaft 70 in the axial direction is provided with a connecting portion 71 for attaching a member for outputting the driving force generated in the rotating electric machine 1 to an external device. The rotating shaft 70 is capable of outputting the driving force generated in the rotating electric machine 1 from the connecting portion 71.

[0014] The rotor 72 attached to the rotating shaft 70 is formed in a substantially annular shape and includes a permanent magnet. The rotor 72 is sandwiched between rotor pressing plates 73 arranged on both sides in the axial direction. This allows the rotor 72 to be arranged at a predetermined position on the rotating shaft 70. The rotor 72 arranged on the rotating shaft 70 in this manner is capable of rotating integrally with the rotating shaft 70 when the rotating shaft 70 rotates.

[0015] The stator 20 is disposed outside the rotor 72 in the radial direction. The stator 20 has a stator core 30, a stator coil 40, and a duct forming member 50. The stator core 30 is formed in a substantially annular shape with an inner diameter slightly larger than the outer diameter of the rotor 72, and is disposed outside the rotor 72 in the radial direction. That is, the stator core 30 has a width in the axial direction that is approximately the same as the width of the rotor 72 in the axial direction, and is disposed at a position in the axial direction that is approximately the same as the position of the rotor 72. In addition, since the inner diameter of the stator core 30 is slightly larger than the outer diameter of the rotor 72, a small gap G is formed between the inner peripheral surface of the stator core 30 and the outer peripheral surface of the rotor 72.

[0016] The brackets 10 are arranged on both sides of the stator core 30 in the axial direction to support the stator core 30. The brackets 10 support the stator core 30 via stator support members 13. The stator support members 13 are arranged on both sides of the stator core 30 in the axial direction and attached to both sides of the stator core 30. The brackets 10 arranged on both sides of the stator core 30 in the axial direction are each attached to the side opposite to the surface of the stator support member 13 that is attached to the stator core 30 in the axial direction. In this way, the brackets 10 support the stator core 30.

[0017] The bracket 10 has an outer circumferential portion 11 and an end surface portion 12. The outer circumferential portion 11 is formed in a substantially circular ring shape, and the end surface portion 12 is disposed on one end side in the axial direction of the ring of the outer circumferential portion 11. The bracket 10 is connected to the stator support member 13 at an end portion of the outer circumferential portion 11 opposite to the end portion on which the end surface portion 12 is located.

[0018] End surface portion 12 of bracket 10 is formed in a substantially circular plate shape, and an outer periphery of end surface portion 12 is connected to an end of outer periphery portion 11 of bracket 10. Outer periphery portion 11 and end surface portion 12 of bracket 10 are connected while being curved, as shown in Fig. 1. End surface portion 12 of bracket 10 formed in this manner constitutes an end surface of rotating electric machine 1 in the axial direction.

[0019] The end surface portion 12 of the bracket 10 has a hole formed in the center of the disk, and a bearing housing 60 that supports a bearing 61 is attached to the central hole in the end surface portion 12. The bearing housing 60 is attached to both end surface portions 12 of the bracket 10 located on both sides of the stator 20 in the axial direction.

[0020] As described above, in the rotating electric machine 1 according to this embodiment, the bearing housings 60 supporting the bearings 61 are attached to the end face portions 12 formed on the bracket 10 on both sides in the axial direction, so that the interior of the rotating electric machine 1, which is the inner portion of the rotating electric machine 1 where the stator 20 and the rotor 72 are arranged, is isolated from the outer portion of the rotating electric machine 1. For this reason, the rotating electric machine 1 according to this embodiment is configured as a rotating electric machine of a totally enclosed structure.

[0021] The bearing 61 supported by the bearing housing 60 is formed in a substantially annular shape, with its outer peripheral surface supported by the bearing housing 60 and the rotating shaft 70 passing through its inner peripheral surface so as to rotatably support the rotating shaft 70 relative to the bearing housing 60. In addition, since the bearing housing 60 is attached to the end surface portions 12 of the brackets 10 arranged on both sides of the stator 20 in the axial direction, the bearings 61 supported by the bearing housing 60 rotatably support the rotating shaft 70 at positions near both ends of the rotating shaft 70 in the axial direction.

[0022] Further, a fan 75 is disposed on the rotating shaft 70. The fan 75 is disposed on both sides of the rotor 72 in the axial direction of the rotating shaft 70, and is capable of rotating integrally with the rotating shaft 70. The base end of the fan 75 attached to the rotating shaft 70 contacts the surface opposite to the surface on the side where the rotor 72 is located, of the rotor pressing plate 73 disposed on both sides of the rotor 72 in the axial direction. The fan 75 is formed in a substantially cone-shaped shape that is inclined in the axial direction away from the rotor 72 as it moves radially outward from the position of the base end attached to the rotating shaft 70.

[0023] Rotating vanes 76 are arranged on the surface of fan 75 near the outer periphery, on the side where rotor 72 is located in the axial direction. Rotating vanes 76 are plate-shaped members whose thickness direction is the circumferential direction centered on the axis of rotating shaft 70, and are formed in a predetermined range from the vicinity of the outer periphery of fan 75 toward the inside in the radial direction. Rotating vanes 76 thus formed are arranged at a plurality of positions in the circumferential direction centered on the axis of rotating shaft 70. Rotating vanes 76 are also arranged in the same form on both fans 75 arranged on both sides of rotor 72 in the axial direction.

[0024] 2 is a cross-sectional view taken along the line AA in FIG. 1. The stator coil 40 of the stator 20 is accommodated in a plurality of grooves 32 formed in the inner circumferential surface 31 of the stator core 30. The grooves 32 are grooves formed from the inner circumferential surface 31 of the stator core 30 toward the outside in the radial direction, and are formed to extend in the axial direction. A plurality of grooves 32 are formed in the circumferential direction of the stator core 30. The stator coil 40 is accommodated in the grooves 32 thus formed, and is arranged with the coil end portions protruding on both sides of the stator core 30 in the axial direction, and the coil end portions are formed across the portions of the stator coil 40 accommodated in different grooves 32. As a result, the stator coils 40 accommodated in the plurality of grooves 32 are continuously formed and arranged.

[0025] The stator core 30 has a first stator core 30a and a second stator core 30b that are located at one and the other ends in the axial direction of the rotating shaft 70 and are spaced apart from each other. In more detail, the stator core 30 is composed of two parts that are spaced apart near the center of the stator core 30 in the axial direction, and has the first stator core 30a located at one end in the axial direction and the second stator core 30b located at the other end.

[0026] The brackets 10 supporting the stator core 30 from both sides in the axial direction are disposed on both sides of the stator core 30 in the axial direction, and support the first stator core 30a and the second stator core 30b. That is, among the brackets 10 supporting the stator core 30 from both sides in the axial direction, the bracket 10 disposed on the opposite side of the side where the second stator core 30b is located relative to the first stator core 30a in the axial direction is the first bracket 10a supporting the first stator core 30a. Also, among the brackets 10 supporting the stator core 30 from both sides in the axial direction, the bracket 10 disposed on the opposite side of the side where the first stator core 30a is located relative to the second stator core 30b in the axial direction is the second bracket 10b supporting the second stator core 30b.

[0027] Furthermore, a bearing housing 60 supporting a bearing 61 is attached to the end surface portion 12 of each of the first bracket 10a and the second bracket 10b. Therefore, the first bracket 10a supports the first stator core 30a, and also supports the rotating shaft 70 via the bearing housing 60 and the bearing 61 so as to be rotatable relative to the first stator core 30a. Similarly, the second bracket 10b supports the second stator core 30b, and also supports the rotating shaft 70 via the bearing housing 60 and the bearing 61 so as to be rotatable relative to the second stator core 30b.

[0028] In the following description, the driving side in the axial direction is one end side, and the anti-driving side in the axial direction is the other end side. In this case, the driving side is the side where the connecting part 71 of the rotating shaft 70 is located in the axial direction, and the anti-driving side is the side opposite to the side where the connecting part 71 of the rotating shaft 70 is located in the axial direction. That is, the stator core 30 having two parts separated from each other in the axial direction has a first stator core 30a located on the driving side and a second stator core 30b located on the anti-driving side.

[0029] At this time, the multiple grooves 32 formed on the inner peripheral surface 31 of the stator core 30 are divided at a portion between the first stator core 30a and the second stator core 30b, and the grooves 32 formed on the first stator core 30a and the grooves 32 formed on the second stator core 30b are continuously formed in the axial direction. That is, the grooves 32 extend in the axial direction across the first stator core 30a and the second stator core 30b. Therefore, the stator coil 40 accommodated in the grooves 32 of the stator core 30 is continuously accommodated in the portion of the grooves 32 formed on the first stator core 30a and the portion formed on the second stator core 30b.

[0030] The duct forming member 50 disposed in the portion between the first stator core 30a and the second stator core 30b of the stator core 30 is connected at both ends in the axial direction to the first stator core 30a and the second stator core 30b. The duct forming member 50 has an annular spacer 51 and a plate-shaped spacer 52. The annular spacer 51 is disposed around the entire circumference at the outer end position of the stator core 30 in the radial direction. That is, the annular spacer 51 is formed in a substantially annular shape with an outer diameter approximately equal to the outer diameter of the stator core 30 and a width approximately equal to the interval between the first stator core 30a and the second stator core 30b, and is disposed in the portion between the first stator core 30a and the second stator core 30b. The annular spacer 51 thus formed is connected at both ends in the width direction to the first stator core 30a and the second stator core 30b. As a result, the portion between the first stator core 30a and the second stator core 30b has its outer end portion in the radial direction blocked by the annular spacer 51 that the duct forming member 50 has.

[0031] Moreover, a plurality of the plate-shaped spacing pieces 52 are arranged in the portion between the first stator core 30a and the second stator core 30b, and the plurality of plate-shaped spacing pieces 52 are arranged radially between the grooves 32 formed in the stator core 30. In detail, the plate-shaped spacing pieces 52 are plate-shaped members arranged such that the width direction of the plate is the direction in which the first stator core 30a and the second stator core 30b are separated from each other, that is, the axial direction, and the thickness direction of the plate is the circumferential direction. The width of the plate-shaped spacing pieces 52 is approximately the same as the gap between the first stator core 30a and the second stator core 30b. As a result, both sides of the plate-shaped spacing pieces 52 in the width direction are connected to the first stator core 30a and the second stator core 30b.

[0032] The circumferential pitch of the plate-shaped spacing pieces 52 is the same as the circumferential pitch of the grooves 32 formed in the stator core 30, so that the plate-shaped spacing pieces 52 are arranged between the grooves 32 formed in the stator core 30. Furthermore, when the plate-shaped spacing pieces 52 are arranged in a portion between the first stator core 30a and the second stator core 30b, the position of the inner end in the radial direction is located near the inner circumferential surface 31 of the stator core 30, and the outer end in the radial direction is connected to the inner circumferential surface of the annular spacing piece 51.

[0033] As a result, in the portion between the first stator core 30a and the second stator core 30b, one space is formed by the circumferentially adjacent plate-like spacing pieces 52 and the annular spacing piece 51 to which these plate-like spacing pieces 52 are connected on the radially outer side, and a plurality of spaces thus formed are formed side by side in the circumferential direction. In other words, since the plate-like spacing pieces 52 are disposed between the circumferentially adjacent groove portions 32, a space formed by the circumferentially adjacent plate-like spacing pieces 52 and the annular spacing piece 51 is formed for each groove portion 32. In this way, the space formed by the circumferentially adjacent plate-like spacing pieces 52 and the annular spacing piece 51 is formed as a radial duct 55 through which air flows in the radial direction.

[0034] That is, the duct forming member 50 arranged in the portion between the first stator core 30a and the second stator core 30b forms a radial duct 55 between the first stator core 30a and the second stator core 30b by means of the annular spacing pieces 51 and the plate-shaped spacing pieces 52. A plurality of the plate-shaped spacing pieces 52 of the duct forming member 50 are arranged radially between the plurality of groove portions 32 formed in the stator core 30. For this reason, the radial ducts 55 formed by the duct forming member 50 are formed for each of the plurality of groove portions 32 arranged in the circumferential direction, and a plurality of the radial ducts 55 are arranged in a line in the circumferential direction.

[0035] Moreover, the grooves 32 formed in the first stator core 30a and the grooves 32 formed in the second stator core 30b are formed continuously in the axial direction, and the stator coil 40 is accommodated in the grooves 32 thus formed across the first stator core 30a and the second stator core 30b. Therefore, in the radial duct 55, a portion of the stator coil 40 between the portion accommodated in the grooves 32 of the first stator core 30a and the portion accommodated in the grooves 32 of the second stator core 30b is located, and the stator coil 40 is arranged exposed within the radial duct 55.

[0036] Further, the stator core 30 has ventilation holes 35 formed at positions outside the grooves 32 in the radial direction, penetrating the stator core 30 in the axial direction. The first stator core 30a has first ventilation holes 35a, which are ventilation holes 35 penetrating the first stator core 30a in the axial direction, formed at positions outside the grooves 32 in the radial direction and closer to the outer circumferential surface of the first stator core 30a. The first ventilation holes 35a are formed at a position in the radial direction radially inward of the annular spacer 51 and close to the inner circumferential surface of the annular spacer 51. As a result, the end of the first ventilation hole 35a on the second stator core 30b side opens to the radial duct 55.

[0037] FIG. 3 is a BB cross-sectional view of FIG. 1. FIG. 4 is a CC cross-sectional view of FIG. 3. In FIG. 3, the position of the first ventilation hole 35a in the circumferential direction is indicated by a broken line so that the difference in the positions of the first ventilation hole 35a and the second ventilation hole 35b can be easily understood. In the second stator core 30b, the second ventilation hole 35b, which is the ventilation hole 35 penetrating the second stator core 30b in the axial direction, is formed at a position outside the groove portion 32 in the radial direction and near the outer circumferential surface of the second stator core 30b. The second ventilation hole 35b is formed at a position in the radial direction that is radially inward of the annular spacer 51 and near the inner circumferential surface of the annular spacer 51. As a result, the end of the second ventilation hole 35b on the first stator core 30a side opens to the radial duct 55.

[0038] Moreover, the first ventilation holes 35a formed in the first stator core 30a are not formed at radially outer positions of all of the groove portions 32, a plurality of which are formed in the stator core 30, but are formed at radially outer positions of predetermined groove portions 32 among the plurality of groove portions 32. Moreover, the second ventilation holes 35b formed in the second stator core 30b are formed axially penetrating the second stator core 30b at radially outer positions of groove portions 32 that are in different circumferential positions from the groove portions 32 in which the first ventilation holes 35a are formed radially outward in the first stator core 30a.

[0039] Specifically, the first ventilation holes 35a formed in the first stator core 30a are formed at radially outer positions of every other groove portion 32 in the circumferential direction in the plurality of groove portions 32 formed in the stator core 30. Similarly, the second ventilation holes 35b formed in the second stator core 30b are formed at radially outer positions of every other groove portion 32 in the circumferential direction in the plurality of groove portions 32 formed in the stator core 30. In this case, the second ventilation holes 35b are formed at radially outer positions of each groove portion 32 that is at a different circumferential position from the groove portion 32 in which the first ventilation holes 35a are formed at a radially outer position in the plurality of groove portions 32 formed in the stator core 30.

[0040] That is, when the grooves 32 are viewed in the circumferential direction, the first ventilation holes 35a formed in the first stator core 30a and the second ventilation holes 35b formed in the second stator core 30b are alternately formed for each groove 32 at the radially outer positions of the multiple grooves 32 formed in the stator core 30. As a result, the first ventilation holes 35a and the second ventilation holes 35b are formed at radially outer positions of the grooves 32 whose circumferential positions are different from each other. In other words, the first ventilation holes 35a and the second ventilation holes 35b are alternately opened for each radial duct 55 when the radial ducts 55 are viewed in the circumferential direction for the multiple radial ducts 55 arranged radially in the circumferential direction.

[0041] As described above, the ventilation duct 15 is formed in the bracket 10 supporting the stator core 30 in which the ventilation holes 35 are formed. The ventilation duct 15 formed in the bracket 10 has one end opening at a position facing the outer end of the fan 75 in the radial direction from the outside of the fan 75, and the other end opening at a position facing the first ventilation hole 35a or the second ventilation hole 35b, and is formed as a hole communicating between the openings at both ends. That is, the ventilation duct 15 is a hole formed in the cross section of the bracket 10 shown in Figs. 1 and 4, extending from the outer end of the fan 75 in the radial direction inside the machine to the part supporting the stator core 30, along the shape of the bracket 10 having the outer periphery 11 and the end face 12.

[0042] Specifically, among the brackets 10 supporting the stator core 30 from both sides in the axial direction, a first ventilation duct 15a is formed as the ventilation duct 15 in a first bracket 10a which is the bracket 10 supporting the stator core 30 from the driving side in the axial direction relative to the stator core 30. Also, a second ventilation duct 15b is formed as the ventilation duct 15 in a second bracket 10b which is the bracket 10 supporting the stator core 30 from the anti-driving side in the axial direction relative to the stator core 30.

[0043] The fans 75 arranged on both sides of the rotor 72 in the axial direction include a first fan 75a arranged on the side where the first stator core 30a is located in the axial direction, and a second fan 75b arranged on the side where the second stator core 30b is located in the axial direction. That is, the first fan 75a is arranged on the drive side, which is the side where the first bracket 10a is located with respect to the rotor 72 in the axial direction, and is a fan 75 that rotates integrally with the rotating shaft 70. The second fan 75b is arranged on the counter drive side, which is the side where the second bracket 10b is located with respect to the rotor 72 in the axial direction, and is a fan 75 that rotates integrally with the rotating shaft 70.

[0044] Of the ventilation ducts 15 formed in the bracket 10, the first ventilation duct 15a has one end opening from the radial outside of the first fan 75a to a position facing the radial outer end of the first fan 75a, and the other end opening to a portion of the first bracket 10a that supports the first stator core 30a. The second ventilation duct 15b has one end opening from the radial outside of the second fan 75b to a position facing the radial outer end of the second fan 75b, and the other end opening to a portion of the second bracket 10b that supports the second stator core 30b.

[0045] Here, the bracket 10 supports the stator core 30 via a stator support member 13, and the stator support member 13 located between the first bracket 10a and the first stator core 30a is the first stator support member 13a, and the stator support member 13 located between the second bracket 10b and the second stator core 30b is the second stator support member 13b. A hole is formed in the first stator support member 13a, which communicates from the first ventilation duct 15a formed in the first bracket 10a to the first stator core 30a, and the hole formed in the first stator support member 13a is also treated as the first ventilation duct 15a. Similarly, a hole is formed in the second stator support member 13b that communicates from the second ventilation duct 15b formed in the second bracket 10b to the second stator core 30b, and this hole formed in the second stator support member 13b is also treated as the second ventilation duct 15b.

[0046] The first ventilation hole 35a formed in the first stator core 30a has an end opposite to the side where the second stator core 30b is located in the axial direction that opens to the first stator support member 13a, but the first ventilation duct 15a opens to a portion of the first ventilation hole 35a that opens to the first stator support member 13a. In other words, the portion of the first ventilation duct 15a that opens to the first ventilation hole 35a has the same radial and circumferential positions as the first ventilation hole 35a. As a result, the first ventilation duct 15a communicates with the first ventilation hole 35a.

[0047] In addition, the portion of the first ventilation duct 15a that opens toward the position of the outer end of the first fan 75a in the radial direction opens into the portion of the first bracket 10a that covers the first fan 75a from the outside in the radial direction. That is, the shape of the first bracket 10a on the inside side is formed in a shape that covers the first fan 75a from the outside in the radial direction near the outer periphery of the first fan 75a, and the first ventilation duct 15a opens in the portion that covers the first fan 75a from the outside in the radial direction. Therefore, the first ventilation duct 15a opens in a position that faces the first fan 75a from the outside in the radial direction near the outer periphery of the first fan 75a in the radial direction. As a result, the first ventilation duct 15a opens into a position that faces the rotary vane 76 formed on the first fan 75a from the outside position in the radial direction.

[0048] A plurality of first ventilation ducts 15a thus formed are formed in the first bracket 10a and the first stator support member 13a, and the plurality of first ventilation ducts 15a are formed at the same circumferential positions as the plurality of first ventilation holes 35a formed in the first stator core 30a. In other words, a plurality of first ventilation ducts 15a are formed in the first bracket 10a and the first stator support member 13a in correspondence with the plurality of first ventilation holes 35a formed in the first stator core 30a.

[0049] The second ventilation holes 35b formed in the second stator core 30b have an end on the axial side opposite to the side where the first stator core 30a is located that opens to the second stator support member 13b, but the second ventilation duct 15b opens to a portion of the second ventilation holes 35b that opens to the second stator support member 13b. In other words, the portion of the second ventilation duct 15b that opens to the second ventilation holes 35b has the same radial and circumferential positions as the second ventilation holes 35b. As a result, the second ventilation duct 15b communicates with the second ventilation holes 35b.

[0050] In addition, the portion of the second ventilation duct 15b that opens toward the outer end position of the second fan 75b in the radial direction opens into the portion of the second bracket 10b that covers the second fan 75b from the outside in the radial direction. That is, the shape of the second bracket 10b on the inside side is formed in a shape that covers the second fan 75b from the outside in the radial direction in the vicinity of the outer periphery of the second fan 75b, and the second ventilation duct 15b opens in the portion that covers the second fan 75b from the outside in the radial direction in this manner. Therefore, the second ventilation duct 15b opens in a position that faces the second fan 75b from the outside in the radial direction in a position near the outer periphery of the second fan 75b in the radial direction. As a result, the second ventilation duct 15b opens into a position that faces the rotary vanes 76 formed on the second fan 75b from the outside position in the radial direction.

[0051] A plurality of second ventilation ducts 15b are formed in the second bracket 10b and the second stator support member 13b in this manner, and the plurality of second ventilation ducts 15b are formed at the same circumferential positions as the plurality of second ventilation holes 35b formed in the second stator core 30b. In other words, a plurality of second ventilation ducts 15b are formed in the second bracket 10b and the second stator support member 13b in correspondence with the plurality of second ventilation holes 35b formed in the second stator core 30b.

[0052] The rotating electric machine 1 according to this embodiment includes the above-mentioned configuration, and an example of its operation will be described below. When the rotating electric machine 1 is in operation, power is supplied to the stator coil 40 of the stator 20. The stator 20 generates magnetic force by the power supplied to the stator coil 40. The magnetic force generated in the stator 20 generates an attractive force and a repulsive force between the permanent magnet of the rotor 72 and the stator 20, and the rotor 72 rotates integrally with the rotating shaft 70. The rotation of the rotating shaft 70 generates a rotational driving force, which is output to an external device from a connecting member (not shown) attached to a connecting portion 71 located at the end of the driving side of the rotating shaft 70.

[0053] Here, when the rotating electric machine 1 is in operation, heat is generated by the supply of power to the stator coil 40, but since the rotating electric machine 1 has a totally enclosed structure and air does not flow between the inside and outside of the machine, the heat generated inside the machine is difficult to dissipate to the outside. In contrast, the rotating electric machine 1 according to this embodiment has ventilation holes 35 and radial ducts 55 formed in the stator 20, ventilation ducts 15 formed in the bracket 10 supporting the stator 20, and fans 75 arranged on both sides of the rotor 72 in the axial direction, making it easy to dissipate heat generated inside the machine to the outside.

[0054] Specifically, when the rotating shaft 70 rotates during operation of the rotating electric machine 1, the fans 75 arranged on both sides of the rotor 72 in the axial direction also rotate together with the rotating shaft 70. Since the fan 75 is provided with the rotating blades 76, the rotating blades 76 arranged on the fan 75 also rotate in the circumferential direction during rotation of the fan 75, and the fan 75 rotates the air around the rotating blades 76 together with the rotating blades 76. As a result, centrifugal force is generated in the air around the rotating blades 76, and the air located on the surface side on which the rotating blades 76 are arranged in the axial direction of the fan 75 flows outward in the radial direction as shown by the arrows in Figs. 1 and 4. In other words, when the fan 75 rotates, an airflow is generated in the air located on the surface side on which the rotating blades 76 are arranged in the axial direction, flowing from the inside to the outside in the radial direction.

[0055] An opening of ventilation duct 15 formed in bracket 10 is located near the outer periphery of fan 75 in the radial direction, and on the radial outside of fan 75. As a result, when fan 75 rotates, air flowing from the inside to the outside in the radial direction near fan 75 enters ventilation duct 15 from the opening of ventilation duct 15 formed in bracket 10 that faces fan 75.

[0056] When the rotating shaft 70 rotates, the fan 75 rotates with the rotation of the rotating shaft 70, and the air in the ventilation duct 15 flows along the ventilation duct 15 from the end on the side that opens to the fan 75 toward the opposite end in the extension direction of the ventilation duct 15. The end of the ventilation duct 15 opposite the end on the side that opens to the fan 75 faces the ventilation hole 35 formed in the stator core 30. Therefore, the air that enters the ventilation duct 15 from the end of the ventilation duct 15 that opens to the fan 75 and flows through the ventilation duct 15 flows out toward the ventilation hole 35 from the end of the ventilation duct 15 facing the ventilation hole 35 of the stator core 30.

[0057] Specifically, the first ventilation duct 15a, which is the ventilation duct 15 formed in the first bracket 10a and the first stator support member 13a, faces the first ventilation hole 35a formed in the first stator core 30a, so that the air flowing through the first ventilation duct 15a from the portion opening facing the first fan 75a flows toward the first ventilation hole 35a. As a result, in the first ventilation hole 35a formed in the first stator core 30a, the air that has flowed in from the first ventilation duct 15a flows from the end of the first ventilation hole 35a on the first ventilation duct 15a side toward the end on the side where the second stator core 30b is located, as shown by the arrow in FIG.

[0058] In addition, the second ventilation duct 15b, which is the ventilation duct 15 formed in the second bracket 10b and the second stator support member 13b, faces the second ventilation hole 35b formed in the second stator core 30b, so that the air flowing through the second ventilation duct 15b from the portion opening facing the second fan 75b flows toward the second ventilation hole 35b. As a result, in the second ventilation hole 35b formed in the second stator core 30b, the air that has flowed in from the second ventilation duct 15b flows from the end of the second ventilation hole 35b on the second ventilation duct 15b side toward the end on the side where the first stator core 30a is located, as shown by the arrow in FIG.

[0059] The air flowing from within the first ventilation hole 35a toward the second stator core 30b, and the air flowing from within the second ventilation hole 35b toward the first stator core 30a, flows from within the first ventilation hole 35a or the second ventilation hole 35b toward the radial duct 55 formed between the first stator core 30a and the second stator core 30b.

[0060] Here, the first ventilation holes 35a and the second ventilation holes 35b are alternately opened for each radial duct 55 when the radial ducts 55 are viewed in sequence in the circumferential direction with respect to the multiple radial ducts 55 that are radially arranged in the circumferential direction. Therefore, the air flowing from the first ventilation holes 35a and the second ventilation holes 35b toward the radial duct 55 flows independently from the first ventilation holes 35a and the second ventilation holes 35b without interference between the air flowing from the first ventilation holes 35a to the radial duct 55 and the air flowing from the second ventilation holes 35b to the radial duct 55.

[0061] The first ventilation holes 35a and the second ventilation holes 35b open to the radial duct 55 at a position near the annular spacer 51. That is, the first ventilation holes 35a and the second ventilation holes 35b open to the radial duct 55 near the outer end of the radial duct 55 in the radial direction. The outer end of the radial duct 55 in the radial direction is blocked by the annular spacer 51 in the radial outward direction. For this reason, the radial duct 55 has the flow of air outward in the radial direction blocked by the annular spacer 51, and the air that flows into the radial duct 55 does not flow outward in the radial direction.

[0062] Air is sequentially sent into the radial duct 55 from the first ventilation hole 35a and the second ventilation hole 35b, and the air flowing into the radial duct 55 from the first ventilation hole 35a and the second ventilation hole 35b flows radially inward along each radial duct 55.

[0063] The air flowing radially inward in the radial duct 55 flows around the portion of the stator coil 40 exposed in the radial duct 55. At that time, the air flowing in the radial duct 55 exchanges heat with the stator coil 40 that has generated heat as a result of the supply of power. That is, the heat generated as a result of the current flowing through the stator coil 40 is dissipated to the air flowing in the radial duct 55.

[0064] In this way, while exchanging heat with the stator coil 40, the air flowing in the radial duct 55 flows radially inward, and when it reaches the position of the rotor 72 located on the radial inside of the radial duct 55, it flows through the gap G between the stator core 30 and the rotor 72. In other words, when the air flowing in the radial duct 55 reaches the position of the rotor 72 located on the radial inside of the stator core 30, it flows along the gap G between the stator core 30 and the rotor 72.

[0065] Here, when the rotating electric machine 1 is driven, the fans 75 arranged on both sides of the rotor 72 in the axial direction cause the air around the fans 75 to flow toward the ventilation duct 15 located on the radial outside of the fans 75. For this reason, air is more likely to flow toward the fans 75 in the portion of the machine other than the radial outside of the fans 75, i.e., in the portion of the surface side where the rotating blades 76 of the fans 75 are arranged in the axial direction. For this reason, the air that flows from inside the radial duct 55 toward the gap G between the stator core 30 and the rotor 72 flows through the gap G toward the fan 75.

[0066] For example, air flowing from the radial duct 55 into the gap G between the first stator core 30a and the rotor 72 flows toward the first fan 75a, which is closer to the first stator core 30a. Air flowing from the radial duct 55 into the gap G between the second stator core 30b and the rotor 72 flows toward the second fan 75b, which is closer to the second stator core 30b.

[0067] The air that has flowed through gap G toward the direction of fan 75 in this manner leaves gap G and reaches the position of fan 75, and then flows radially outward of fan 75 as fan 75 rotates, and enters ventilation duct 15. The air that has flowed into ventilation duct 15 flows through ventilation duct 15 and ventilation holes 35, which are formed in positions close to the outer surface of rotating electric machine 1.

[0068] That is, the ventilation duct 15 is formed in the bracket 10 that separates the inside and outside of the rotating electric machine 1, and the ventilation holes 35 are formed in a position close to the outer peripheral surface of the stator core 30, so that the ventilation duct 15 and the ventilation holes 35 are formed in a position close to the outer surface of the rotating electric machine 1. Therefore, the air flowing through the ventilation duct 15 and the ventilation holes 35 can easily exchange heat with the air outside the machine.

[0069] The air flowing from the gap G between the stator core 30 and the rotor 72 toward the fan 75 exchanges heat with the stator coil 40, and becomes air with a high temperature. Therefore, when the air with a high temperature flows from the fan 75 to the ventilation duct 15 and then flows from the ventilation duct 15 to the ventilation holes 35, heat exchange occurs between the air in the ventilation duct 15 or the ventilation holes 35 and the air outside the machine, and the air in the ventilation duct 15 or the ventilation holes 35 dissipates heat to the air outside the machine.

[0070] The air, whose temperature has been reduced by dissipating heat to the air outside the machine, flows from the ventilation holes 35 into the radial duct 55 and exchanges heat with the stator coil 40 exposed inside the radial duct 55. As a result, the stator coil 40 dissipates heat to the air flowing inside the radial duct 55.

[0071] During operation of the rotating electric machine 1, the fan 75 rotates in accordance with the rotation of the rotating shaft 70, and the air inside the machine circulates from the fan 75 through the ventilation duct 15, the ventilation holes 35, the radial duct 55, the gap G between the stator core 30 and the rotor 72, and the fan 75 in this order. At that time, heat generated in the stator coil 40 by power being supplied to the stator coil 40 is dissipated to the air flowing through the radial duct 55, and the air whose temperature has increased due to the heat from the stator coil 40 dissipates heat to the air outside the machine as it flows through the ventilation duct 15 and the ventilation holes 35. As a result, the heat generated in the stator coil 40 is dissipated to the air outside the machine via the air circulating inside the machine, and the stator coil 40 is cooled.

[0072] The stator coil 40 is thus cooled by the air circulating inside the machine, but the first ventilation hole 35a formed in the first stator core 30a and the second ventilation hole 35b formed in the second stator core 30b are formed at radially outer positions of the groove portion 32 whose circumferential positions are different from each other. In other words, the first ventilation hole 35a and the second ventilation hole 35b open to the radial duct 55 whose circumferential positions are different from each other. Therefore, the air flowing from the first ventilation hole 35a to the radial duct 55 and the air flowing from the second ventilation hole 35b to the radial duct 55 do not collide with each other, and the air flowing on the first ventilation hole 35a side and the air flowing on the second ventilation hole 35b side can each flow in one direction.

[0073] This allows the air to be circulated efficiently when the stator coil 40 is cooled by the circulating air, and therefore the cooling can be performed efficiently. As a result, the cooling effect can be improved in the rotating electric machine 1 of the totally enclosed structure.

[0074] Further, the first ventilation hole 35a and the second ventilation hole 35b are formed at the radially outer positions of every other groove portion 32 in the circumferential direction in the plurality of groove portions 32, and at the radially outer positions of the groove portions 32 whose circumferential positions are different from each other. This allows the flow of air circulating through the first ventilation hole 35a and the flow of air circulating through the second ventilation hole 35b to be uniform in the circumferential direction. Therefore, heat dissipation from the stator coil 40 to the air flowing through the radial duct 55, and heat dissipation from the air flowing through the ventilation duct 15 and the ventilation hole 35 to the air outside the machine can be distributed between the driving side and the non-driving side in the circumferential direction and the axial direction. As a result, the cooling effect can be improved more reliably in the rotating electric machine 1 of the totally enclosed structure.

[0075] In addition, since the cooling effect can be improved in a totally enclosed structure type rotating electric machine 1, the cooling effect can be improved while maintaining the totally enclosed structure, which has the advantage of eliminating the need for maintenance work such as cleaning inside the machine.

[0076] In addition, since fans 75 for circulating air inside the machine are arranged on both the driving side and the non-driving side, the amount of air blown by the fans 75 can be increased. This improves the cooling performance when cooling the stator coil 40 with the air blown by the fans 75. Furthermore, by improving the cooling performance in this way, it is possible to increase the capacity compared to the conventional rotating electric machine 1 of a totally enclosed structure.

[0077] [Variations] In the above-described embodiment, the rotating motor 1 is a so-called frameless type rotating motor 1 in which the stator 20 is supported by brackets 10 from both sides in the axial direction and does not have a frame formed across the driving side and the anti-driving side, but the rotating motor 1 may have a frame formed across the driving side and the anti-driving side.

[0078] In the above-described embodiment, the first ventilation holes 35a formed in the first stator core 30a and the second ventilation holes 35b formed in the second stator core 30b are both formed at positions radially outside every other groove portion 32 in the circumferential direction in the multiple groove portions 32, but the first ventilation holes 35a and the second ventilation holes 35b may be formed at positions radially outside the groove portions 32 other than every other groove portion 32. In other words, the first ventilation holes 35a and the second ventilation holes 35b may be opened in a manner other than alternating with each other with respect to the multiple radial ducts 55 formed side by side in the circumferential direction.

[0079] For example, two circumferentially adjacent first ventilation holes 35a may each open into two circumferentially adjacent radial ducts 55, and two circumferentially adjacent second ventilation holes 35b may each open into two circumferentially adjacent radial ducts 55, with the first ventilation holes 35a and radial ducts 55 and the second ventilation holes 35b and radial ducts 55 being formed alternately in the circumferential direction.

[0080] In addition, when the first fan 75a and the second fan 75b have different sizes, shapes, etc. and therefore have different air volumes during rotation, the number of the first ventilation holes 35a and the number of the second ventilation holes 35b may be made different according to the difference in air volume between the first fan 75a and the second fan 75b. For example, the number of ventilation holes 35 through which the air sent from the fan 75 on the side with a smaller air volume flows may be made greater than the number of ventilation holes 35 through which the air sent from the fan 75 on the side with a larger air volume flows, thereby adjusting the balance between the amount of air circulating on the driving side and the amount of air circulating on the counter-driving side. The first ventilation holes 35a and the second ventilation holes 35b may be arranged in any manner as long as they open into different radial ducts 55.

[0081] Although some 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 implemented 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 in the scope and spirit of the invention, and are included in the scope of the invention and its equivalents described in the claims. [Explanation of symbols]

[0082] 1 Rotating Electric Machine 10 Bracket 10a First bracket 10b Second bracket 11 Outer periphery 12 End section 13 Stator support member 13a First stator support member 13b Second stator support member 15 Ventilation duct 15a First ventilation duct 15b Second ventilation duct 20 Stator 30 Stator core 30a No. 1 stator core 30b Second stator core 31 Inner surface 32 Groove 35 Ventilation hole 35a 1st ventilation hole 35b 2nd ventilation hole 40 Stator coil 50 Duct forming member 51 Annular spacer 52 Plate-shaped spacer 55 Radial Duct 60 Bearing housing 61 Bearings 70 Rotational Axis 71 Connecting part 72 Rotor 73 Rotor retainer plate 75 Fans 75a 1st Fan 75b 2nd Fan 76 Rotor Blade

Claims

1. A rotor attached to a rotating shaft; a stator having a first stator core and a second stator core that are arranged apart from each other on the radially outer side of the rotor and are arranged apart from each other in the axial direction of the rotating shaft, and a duct forming member that is arranged in a portion between the first stator core and the second stator core and is connected to the first stator core and the second stator core; a first bracket disposed on an opposite side of the first stator core in the axial direction from a side where the second stator core is located, the first bracket supporting the first stator core and supporting the rotating shaft so as to be rotatable relative to the first stator core; a second bracket that is disposed on an opposite side of the second stator core in the axial direction from a side where the first stator core is located, supports the second stator core, supports the rotating shaft relatively rotatably with respect to the second stator core, and a first fan that is disposed on a side of the rotor where the first bracket is located in the axial direction and rotates integrally with the rotating shaft; a second fan that is disposed on a side of the rotor where the second bracket is located in the axial direction and rotates integrally with the rotating shaft; Equipped with a groove portion is formed on an inner peripheral surface of the stator core, the groove portion extending in the axial direction across the first stator core and the second stator core, and a plurality of the groove portions are arranged in a circumferential direction of the stator core, A stator coil is housed in the plurality of grooves, The duct forming member is an annular spacer disposed around the entire circumference of the stator core at an outer end of the stator core in the radial direction, and having both ends in the axial direction connected to the first stator core and the second stator core; a plate-like spacer that is formed in a plate-like shape and is arranged such that the width direction of the plate is the axial direction and the thickness direction of the plate is the circumferential direction, both sides in the axial direction are connected to the first stator core and the second stator core, and an outer end in the radial direction is connected to the annular spacer; having A plurality of the plate-shaped spacing pieces are radially arranged between the respective groove portions, A first ventilation hole penetrating the first stator core in the axial direction is formed in the first stator core at a position outside the groove portion in the radial direction, In the second stator core, a second ventilation hole is formed at a radially outer position of the groove portion different from a circumferential position of the groove portion in which the first ventilation hole is formed on the radially outer side in the first stator core, the second ventilation hole penetrating the second stator core in the axial direction, a first ventilation duct is formed in the first bracket, the first ventilation duct having one end that opens from an outer side of the first fan in the radial direction to a position facing an outer end of the first fan in the radial direction and the other end that opens to a position facing the first ventilation hole; A rotating electric machine characterized in that a second ventilation duct is formed in the second bracket, one end of which opens from the outside of the radial direction of the second fan to a position opposite the radial outer end of the second fan, and the other end of which opens to a position opposite the second ventilation hole.

2. The first ventilation holes are formed at radially outer positions of every other one of the groove portions in the circumferential direction, The rotating electric machine according to claim 1 , wherein the second ventilation hole is formed at a radially outer position of each of the groove portions that is at a different circumferential position from the groove portions in which the first ventilation hole is formed at a radially outer position.

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