Rotary electric machine

Abstract

To provide a rotary electric machine having a novel configuration that can suppress deterioration in the cooling performance of a stator and a rotor.SOLUTION: A rotary electric machine 1 includes a housing 10, a first stator 30, a first rotor 20, an exciter 100, an inner fan 25b, a first cooler 66A, and a second cooler 66B. The housing 10 includes a first chamber 10a, a second chamber 10b communicating with the first chamber 10a, and a third chamber 10c communicating with the first chamber 10a and the second chamber 10b in an interior 10n, and accommodates gas in the interior 10n. The inner fan 25b generates a flow of gas. The first cooler 66A cools the gas. The second cooler 66B is located downstream of the exciter 100 and upstream of the stator 30 and a rotor core 22 in the flow direction of cooling gas, and cools the cooling gas.SELECTED DRAWING: Figure 1

Description

[Technical field]

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

[0002] A rotating electric machine is known in the art that has a configuration in which a stator, a rotor, an exciter, an internal fan, and a cooler are housed in a housing, and gas within the housing is circulated by the internal fan. In this rotating electric machine, the stator, the rotor, and the exciter are cooled by gas cooled by the cooler. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2020-72595 A Summary of the Invention [Problem to be solved by the invention]

[0004] In this type of rotating electric machine, for example, as the output of the rotating electric machine increases, it is necessary to increase the output of the exciter. When the output of the exciter increases, the amount of heat dissipated by the exciter increases, and the temperature of the gas flowing from the exciter to the stator and rotor increases, which may reduce the cooling ability of the gas for the stator and rotor.

[0005] Therefore, one object of the present invention is to provide a rotating electric machine having a novel configuration that can suppress a decrease in the cooling performance of the stator and rotor. [Means for solving the problem]

[0006] A rotating electric machine according to an embodiment of the present invention includes a housing having a first chamber, a second chamber communicating with the first chamber, and a third chamber communicating with the first chamber and the second chamber, the housing containing a gas therein, a first stator housed in the first chamber and fixed to the housing, a shaft having a portion located inside the first stator and rotatable with respect to the housing, and a rotor core located inside the first stator and rotating integrally with the shaft; The rotor core includes an exciter that rotates integrally with the shaft, an internal fan that is provided on the shaft and rotates integrally with the shaft to generate a flow of the gas that enters the first chamber through the second chamber and returns to the first chamber from the third chamber, a first cooler that is housed in the second chamber and cools the gas, and a second cooler that is housed in the housing and is located downstream of the exciter and upstream of the first stator and the rotor core in the flow direction of the gas, and cools the gas. Effect of the Invention

[0007] According to an embodiment of the present invention, it is possible to obtain a rotating electric machine with a novel configuration that can suppress a decrease in the cooling performance of the stator and rotor. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a schematic diagram showing the configuration of a rotating electric machine according to an embodiment. [Diagram 2] FIG. 2 is a cross-sectional view showing a part of the rotating electric machine according to the embodiment. [Diagram 3] FIG. 3 is a cross-sectional view showing a portion including a second cooler in the rotating electric machine of the embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, exemplary embodiments of the present invention will be disclosed. The configurations (technical features) of the embodiments described below, as well as the actions and results (effects) brought about by the configurations, are merely examples.

[0010] In addition, the drawings are schematic, and the dimensional relationships and ratios of each element may differ from reality. Furthermore, the drawings may include parts whose dimensional relationships and ratios differ from one another. In this specification, ordinal numbers are used only to distinguish between parts, members, sites, positions, directions, etc., and do not indicate order or priority.

[0011] Fig. 1 is a schematic diagram showing the configuration of a rotating electric machine 1 according to an embodiment of the present invention, and Fig. 2 is a cross-sectional view showing a part of the rotating electric machine 1 according to an embodiment of the present invention.

[0012] As shown in FIG. 1 and FIG. 2, the rotating electric machine 1 has a housing 10, a rotor 20, a stator 30, internal fans 25a, 25b, a first cooler 66A, a second cooler 66B, and an exciter 100. Hereinafter, the first cooler 66A and the second cooler 66B are collectively referred to as a cooler 66. Note that, although a brushless rotating electric machine is exemplified in the present specification, the rotating electric machine 1 is not limited to a brushless rotating electric machine. The rotor 20 is an example of a first rotor, and the stator 30 is an example of a first stator. The housing 10 is also referred to as a housing. The internal fans 25a, 25b are also referred to as fans.

[0013] In each figure, three mutually orthogonal directions are shown. The X direction is along the longitudinal direction of the housing 10 and the axial direction of the rotation center axis Ax of the rotor 20. The Y direction is along the direction perpendicular to the short side direction of the housing 10 and the axial direction of the rotation center axis Ax. The Z direction is along the vertical direction of the housing 10. The X direction, the Y direction, and the Z direction are mutually orthogonal. Here, the rotation center axis Ax is the central axis (center line) of the shaft 21 of the rotor 20. That is, the axial direction, radial direction, and circumferential direction of the rotation center axis Ax are the same as the axial direction, radial direction, and circumferential direction of the shaft 21. In the following description, unless otherwise specified, the axial direction, radial direction, and circumferential direction are the axial direction, radial direction, and circumferential direction of the rotation center axis Ax, that is, the axial direction, radial direction, and circumferential direction of the shaft 21.

[0014] The inside 10n of the housing 10 includes a first chamber 10a, a second chamber 10b, and a third chamber 10c. The second chamber 10b is adjacent to the first chamber 10a and communicates with the first chamber 10a. The third chamber 10c is adjacent to the first chamber 10a and the second chamber 10b and communicates with the first chamber 10a and the second chamber 10b. Specifically, the third chamber 10c communicates with the second chamber 10b through the exciter inlet duct 64 and with the first chamber 10a through the exciter outlet duct 65. In this way, the first chamber 10a, the second chamber 10b, and the third chamber 10c communicate with each other. The exciter inlet duct 64 and the exciter outlet duct 65 constitute the housing 10.

[0015] The first chamber 10a houses the rotor 20, the stator 30, and the internal fans 25a and 25b. The second chamber 10b houses the first cooler 66A. The third chamber 10c houses the exciter 100. The exciter outlet duct 65 houses the second cooler 66B.

[0016] The interior 10n of the housing 10 is filled with a cooling gas (hereinafter also referred to as cooling gas) that is a refrigerant. That is, the interior 10n of the housing 10 is a closed space that contains the cooling gas. The cooling gas is, for example, air. The gas circulates through the interior 10n of the housing 10 by the operation of the internal fans 25a and 25b. The gas cools the rotor 20, the stator 30, and the exciter 100 as it passes through these parts. At this time, the gas heated by the heat of the above-mentioned parts is cooled by heat exchange with cooling water (refrigerant) in the cooler 66, and can cool the rotor 20, the stator 30, and the exciter 100 again.

[0017] Further, a connection side bearing 45a and an exciter side bearing 45b are provided in the first chamber 10a. Further, a connection side bearing bracket 55a and an exciter side bearing bracket 55b are provided in the first chamber 10a. The connection side bearing 45a is fixed to the connection side bearing bracket 55a, and the exciter side bearing 45b is fixed to the exciter side bearing bracket 55b.

[0018] The housing 10 is also provided with a partition wall portion 15 and a partition wall portion 67. The partition wall portion 15 is located between the first chamber 10a and the third chamber 10c, and separates the first chamber 10a from the third chamber 10c. The partition wall portion 15 is provided with a first hole 16 (FIG. 2) through which the shaft 21 passes. For example, a labyrinth seal is provided on the inner peripheral surface of the first hole 16, facing the shaft 21. The tip of the labyrinth seal facing the shaft 21 is separated from the outer peripheral surface of the shaft 21 passing through the first hole 16 with a first gap in the radial direction. The partition wall portion 15 is also called an oil stop ring.

[0019] The partition wall portion 15 is attached to the exciter side bearing bracket 55b. As shown in FIG. 2, the exciter side bearing bracket 55b surrounds the exciter side bearing 45b in the radial direction. The partition wall portion 15 attached to the exciter side bearing bracket 55b surrounds the exciter side bearing 45b in the axial direction. The exciter side bearing bracket 55b and the partition wall portion 15 form an exciter side bearing seal portion 56b that surrounds the exciter side bearing 45b in the radial and axial directions. The exciter side bearing seal portion 56b is filled with lubricating oil and is also called, for example, an oil box.

[0020] 1, the partition wall 67 is located between the first chamber 10a and the second chamber 10b and separates the first chamber 10a from the second chamber 10b. The partition wall 67 is provided with a cooler inlet opening 51a and cooler outlet openings 51b and 51c.

[0021] The rotor 20 has a shaft 21, a rotor core 22, and a rotor winding 23 (field winding). The shaft 21 extends between the first chamber 10a and the third chamber 10c along the rotation central axis Ax, and is supported by a connection side bearing 45a and an exciter side bearing 45b so as to be rotatable about the rotation central axis Ax. A coupling portion 13 is formed at one end of the shaft 21. The shaft 21 is coupled at the coupling portion 13 to a driven object when the rotating electric machine 1 is an electric motor, or to a prime mover when the rotating electric machine 1 is a generator.

[0022] The rotor core 22 is formed in a cylindrical shape around the central axis of rotation Ax. The rotor core 22 has a laminated structure in which, for example, disk-shaped steel plates made of a ferromagnetic material and having an opening in the center are laminated in the axial direction. The rotor core 22 is attached to the radial outside of the shaft 21 in the first chamber 10a. The rotor core 22 is provided with a rotor winding 23. The rotor winding 23 is fixed to the rotor core 22. In detail, the rotor winding 23 is fixed to the rotor core 22 in a state in which it penetrates the rotor core 22 in the axial direction.

[0023] The inner fans 25a and 25b are fixed to the shaft 21 in the first chamber 10a. The inner fans 25a and 25b rotate integrally with the shaft 21 around the central axis of rotation Ax to generate an airflow in the first chamber 10a and in the entire interior 10n of the housing 10. More specifically, at least the inner fan 25b rotates integrally with the shaft 21 to generate a flow of cooling gas that enters the third chamber 10c from the first chamber 10a via the second chamber 10b and returns from the third chamber 10c to the first chamber 10a. The rotor core 22 is located between the inner fans 25a and 25b.

[0024] As shown in Fig. 1, the stator 30 is provided on the radial outside of the rotor 20 and is formed in a cylindrical shape extending in the axial direction. The stator 30 has a stator core 31 and a stator winding 32. The stator core 31 has a laminated structure in which, for example, disk-shaped steel plates made of a ferromagnetic material and having an opening in the center are laminated in the axial direction. On the inside of the stator core 31 facing the radial outside of the rotor core 22, slots (not shown) are formed that extend in the axial direction at intervals in the circumferential direction of the rotation center axis Ax. Stator windings 32 are provided in each slot and on both axial outsides of the stator core 31.

[0025] The container 10 has a cooler cover 62 on the top of the first chamber 10a. The cooler cover 62 houses a first cooler 66A. The first cooler 66A is, for example, a heat exchanger. The first chamber 10a and the internal space of the cooler cover 62 are in communication with each other through a cooler inlet opening 51a and cooler outlet openings 51b and 51c. The cooler inlet opening 51a is located between the cooler outlet opening 51b and the cooler outlet opening 51c.

[0026] Partition plates 51d and 51f are provided in the first chamber 10a. The partition plates 51d and 51f have circular openings that penetrate the partition plates 51d and 51f in the axial direction.

[0027] The partition plate 51d is provided axially between the stator core 31 and the connection-side bearing 45a. The partition plate 51f is provided axially between the stator core 31 and the exciter-side bearing 45b.

[0028] An exciter shaft 26 is provided on an extension of a portion of the shaft 21 supported by the exciter-side bearing 45b. The exciter shaft 26 is a part of the shaft 21 provided in the third chamber 10c, and is rotatable around the central axis of rotation Ax. The exciter shaft 26 may be a separate body from the part of the shaft 21 provided in the first chamber 10a.

[0029] The excitation device 100 is provided inside the third chamber 10 c and includes a rotor 110 and an exciter 120 .

[0030] 2, the rotor 110 has, for example, a rotary rectifier 115. The rotary rectifier 115 has, for example, a plurality of rectifiers arranged at equal intervals in the circumferential direction and extending radially. The rotor 110 is provided on the exciter shaft 26 in the third chamber 10c and is rotatable around the rotation center axis Ax together with the exciter shaft 26.

[0031] The exciter 120 includes an excitation rotor 121 , an excitation stator 122 , and a spider 150 .

[0032] The excitation stator 122 is formed in a cylindrical shape around the central axis of rotation Ax. The excitation stator 122 is provided so as to face the excitation rotor 121 in the radial direction, and is fixed to the housing 10. DC power is supplied to the excitation stator 122 from a power source. The excitation stator 122 is configured by an electromagnet formed by windings. The excitation stator 122 is not limited to this. For example, when it is not necessary to control the field current of the rotating electric machine 1, i.e., the current flowing through the windings of the rotor 20, a permanent magnet may be used.

[0033] The excitation rotor 121 has an excitation rotor core 131 and an excitation rotor winding 132 .

[0034] The excitation rotor core 131 is formed in a cylindrical shape around the rotation axis Ax. The excitation rotor core 131 has a laminated structure in which, for example, disk-shaped steel plates made of ferromagnetic material and having an opening in the center are laminated in the axial direction. The excitation rotor core 131 has a spider 150 inserted inside in the radial direction and is fixed to the exciter shaft 26 via the spider 150. The excitation rotor core 131 is inserted inside in the radial direction of the excitation stator 122. In addition, a plurality of slots are formed on the outer periphery of the excitation rotor core 131, which are spaced apart from each other in the circumferential direction of the rotation axis Ax and extend in the axial direction. The excitation rotor windings 132 are inserted in these slots. The excitation rotor windings 132 are fixed to the excitation rotor core 131.

[0035] The spider 150 is annular (cylindrical) around the central axis of rotation Ax, and the exciter shaft 26 is inserted radially inside the spider 150 and fixed to the exciter shaft 26. The spider 150 is also called a bracket or a fixing member.

[0036] When the excitation rotor 121 rotates around the rotation axis Ax inside the DC field generated by the excitation stator 122, an AC induced electromotive force is generated in the excitation rotor 121 of the excitation rotor 121. The AC power generated in the excitation rotor winding 132 is converted to DC power by the rotary rectifier 115 and is supplied to the rotor winding 23 (field winding) provided on the rotor core 22 which also rotates around the rotation axis Ax. This field generates an induced electromotive force in the stator winding 32, i.e., the armature winding.

[0037] Next, the housing 10 will be described in more detail. As shown in FIG. 1, the housing 10 has a connecting side bearing bracket 55a, an exciter side bearing bracket 55b, a frame 61, a cooler cover 62, an exciter cover 63, an exciter inlet duct 64, an exciter outlet duct 65, and partition walls 15 and 67. The connecting side bearing bracket 55a, the exciter side bearing bracket 55b, the frame 61, the cooler cover 62, the exciter cover 63, and the partition walls 15 and 67 constitute a base part 11. The base part 11 is provided with a first chamber 10a, a second chamber 10b, and a third chamber 10c. The exciter inlet duct 64 and the exciter outlet duct 65 are detachably coupled to the base part 11. As shown in FIG. 2, for example, the exciter outlet duct 65 is fixed to the base portion 11 by a fastener 160 such as a bolt, and can be removed from the base portion 11 by removing the fastener 160.

[0038] The exciter cover 63 surrounds the third chamber 10c. An exciter inlet duct 64 that communicates between the exciter cover 63 and the cooler cover 62 is provided between the exciter cover 63 and the cooler cover 62. In addition, an exciter outlet duct 65 that communicates between the exciter cover 63 and the exciter side bearing bracket 55b is provided between the exciter cover 63 and the exciter side bearing bracket 55b.

[0039] The first chamber 10a is formed by a connecting side bearing bracket 55a and an exciter side bearing bracket 55b provided at both axial ends, a frame 61 provided along the shaft 21 between the connecting side bearing bracket 55a and the exciter side bearing bracket 55b, and partitions 15 and 67. The second chamber 10b is formed by a cooler cover 62 and a partition 67. The third chamber 10c is formed by the partition 15, the exciter side bearing bracket 55b, and the exciter cover 63.

[0040] The exciter outlet duct 65 is provided with a flow passage 59c that communicates the first chamber 10a and the third chamber 10c. A first opening end 59a, which is one end of the flow passage 59c, opens to the upper end of the exciter side bearing bracket 55b. As a result, the first opening end 59a opens to the first chamber 10a. In addition, a second opening end 59b, which is the other end of the flow passage 59c, opens to the exciter cover 63 at a position radially spaced from the rotor 110. As a result, the second opening end 59b opens to the third chamber 10c. In this embodiment, the second opening end 59b opens to the third chamber 10c at a position spaced upward from the rotor 110.

[0041] The exciter inlet duct 64 is connected to the exciter cover 63 at a position farther from the first chamber 10a than the exciter outlet duct 65. An exciter 120 is provided axially between the position where the exciter inlet duct 64 is connected to the exciter cover 63 and the second opening end 59b.

[0042] The housing 10 forms an enclosed space 70 in the interior 10n by the frame 61, the cooler cover 62, the exciter cover 63, the exciter inlet duct 64, the exciter outlet duct 65, etc. The enclosed space 70 includes a first chamber 10a, a second chamber 10b, and a third chamber 10c. The enclosed space 70 also includes an exciter cover portion 75, a frame central portion 76, a cooler cover portion 77, and fan inlet portions 78 and 79. The exciter cover portion 75 is included in the third chamber 10c. The frame central portion 76 and the fan inlet portions 78 and 79 are included in the first chamber 10a.

[0043] Frame center portion 76 is located between partition plate 51d and partition plate 51f, and is an area in which rotor core 22 and stator 30 are provided. Fan inlet portion 78 is a portion between inner fan 25a, partition plate 51d, and connection side bearing 45a. Fan inlet portion 79 is a portion between exciter side bearing 45b, inner fan 25b, and partition plate 51f. Fan inlet portion 79 communicates with exciter cover portion 75 through flow path 59c.

[0044] The cooler cover part 77 is formed by the cooler cover 62. The cooler cover part 77 communicates with the frame central part 76 through the cooler inlet opening 51a, and communicates with the fan inlets 78 and 79 through the cooler outlet openings 51b and 51c. The cooler cover part 77 also communicates with the exciter cover part 75 through the exciter inlet duct 64.

[0045] Next, the cooler 66 will be described in detail. The first cooler 66A is provided in the second chamber 10b and fixed to the partition wall 67. On the other hand, the second cooler 66B is provided inside the exciter outlet duct 65, i.e., between the third chamber 10c and the first chamber 10a, and fixed to the exciter outlet duct 65. In other words, the second cooler 66B is disposed downstream of the first cooler 66A in the flow direction of the cooling gas.

[0046] The first cooler 66A and the second cooler 66B are both configured by heat exchangers and have the same basic configuration. However, the second cooler 66B is smaller in size than the first cooler 66A. That is, the second cooler 66B is smaller in size and has lower cooling performance than the first cooler 66A. Note that the first cooler 66A and the second cooler 66B may have different configurations.

[0047] Hereinafter, the configuration of the cooler 66 will be described with reference to Figures 2 and 3. Figure 3 is a cross-sectional view showing a portion including a second cooler 66B in the rotating electric machine 1 of the embodiment.

[0048] As shown in Figures 2 and 3, the cooler 66 has a frame 66a, a plurality of cooling pipes (not shown) supported by the frame 66a, and a plurality of fins connected to the plurality of cooling pipes.

[0049] A vertical wall 66b of the frame 66a is provided with an inlet 66c and an outlet 66d. The inlet 66c and the outlet 66d are connected to pipes 201 and 202, respectively. The pipes 201 and 202 penetrate the side wall 65a of the exciter outlet duct 65. A seal member is provided between the pipes 201 and 202 and the side wall 65a. The inlet 66c is connected to one end of a plurality of cooling pipes via an inlet-side water chamber. The outlet 66d is connected to the other end of a plurality of cooling pipes via an outlet-side water chamber. In the cooler 66, a cooling liquid (refrigerant) such as water that flows from the pipe 201 into the inlet 66c flows inside the cooling pipes and flows out of the pipe 202 from the outlet 66d. Here, the cooling water of the first cooler 66A and the second cooler 66B may be supplied by one common cooling water supply device or may be supplied by separate cooling water supply devices. In addition, in the case of a configuration in which cooling water is circulated, the cooling water for the first cooler 66A and the second cooler 66B may be collected and cooled together by a single shared cooling water supply device, and the cooled cooling water may be distributed to the first cooler 66A and the second cooler 66B.

[0050] Furthermore, a water drainage opening 66e (drain) and an air vent opening 66f are provided on the vertical wall 66b of the frame 66a. The water drainage opening 66e and the air vent opening 66f are closed by lids.

[0051] In the cooler 66, heat is exchanged between the cooling gas flowing outside the cooling pipe of the cooler 66 and the cooling liquid flowing inside the cooling pipe, and the cooling gas is cooled by the cooling liquid.

[0052] The second cooler 66B is disposed in such a position that the inlet 66c and the outlet 66d do not face the housing 10 other than the exciter outlet duct 65. That is, the second cooler 66B is disposed in such a position that the inlet 66c and the outlet 66d do not face the base portion 11 and the exciter inlet duct 64. For example, the second cooler 66B is disposed in such a position that the inlet 66c and the outlet 66d face the side of the rotating electric machine 1.

[0053] In this embodiment configured as described above, the shaft 21 rotates during operation of the rotating electric machine 1. As a result, the internal fans 25a, 25b rotate, circulating the cooling gas within the sealed space 70. In Fig. 1, the flow (airflow) of the cooling gas is shown by arrows.

[0054] The cooling gas flows from the frame central portion 76 through the cooler inlet opening 51a into the cooler cover portion 77. After being cooled in the first cooler 66A in the cooler cover portion 77, a portion of the cooling gas flows into the fan inlet portion 78 through the cooler outlet opening 51b and further flows into the frame central portion 76. Another portion flows into the fan inlet portion 79 through the cooler outlet opening 51c and further flows into the frame central portion 76. In this manner, the cooling gas cools the rotor core 22 and the stator 30.

[0055] In addition, in parallel with the flow from the cooler cover portion 77 to the fan inlet portion 79, there is a flow passing through the exciter cover portion 75. That is, after the cooling gas is cooled in the first cooler 66A in the cooler cover portion 77, it passes through the exciter inlet duct 64 and flows into the exciter cover portion 75, and further passes through the flow path 59c in the exciter outlet duct 65 and flows into the fan inlet portion 79. The cooling gas flowing through the exciter cover portion 75 cools the exciter 100 as it passes through the exciter 100.

[0056] When the cooling gas cools the exciter 100, the temperature of the cooling gas increases due to the heat of the exciting rotor 121 and the exciting stator 122. The cooling gas with the increased temperature is cooled by the second cooler 66B while passing through the exciter outlet duct 65, and becomes relatively low temperature. The cooling gas then flows from the fan inlet 79 into the first chamber 10a, and cools the stator 30 and the rotor core 22 while passing through them.

[0057] As described above, in this embodiment, the rotating electric machine 1 includes the housing 10, the stator 30 (first stator), the rotor 20 (first rotor), the excitation device 100, the inner fan 25b, the first cooler 66A, and the second cooler 66B. The housing 10 has a first chamber 10a, a second chamber 10b communicating with the first chamber 10a, and a third chamber 10c communicating with the first chamber 10a and the second chamber 10b in its interior 10n, and contains a cooling gas (gas) in its interior 10n. The stator 30 is housed in the first chamber 10a and fixed to the housing 10. The rotor 20 has a shaft 21, a part of which is located inside the stator 30 and rotatable with respect to the housing 10, and a rotor core 22, which is located inside the stator 30 and rotates integrally with the shaft 21. The exciter 100 is housed in the third chamber 10c, and a part of it (exciter stator 122, rotor 110) rotates integrally with the shaft 21. The inner fan 25b is provided on the shaft 21, and rotates integrally with the shaft 21 to generate a flow of gas that enters the third chamber 10c from the first chamber 10a through the second chamber 10b and returns from the third chamber 10c to the first chamber 10a. The first cooler 66A is housed in the second chamber 10b and cools the gas. The second cooler 66B is housed in the housing 10 and is located downstream of the exciter 100 and upstream of the stator 30 and rotor core 22 in the flow direction of the cooling gas, and cools the cooling gas.

[0058] According to this configuration, even if the cooling gas cooled by the first cooler 66A rises in temperature due to the heat of the exciter 100, the cooling gas is subsequently cooled by the second cooler 66B. Therefore, the cooling gas at a relatively low temperature flows through the stator 30 and the rotor core 22, and the stator 30 and the rotor core 22 can be cooled by the cooling gas. This makes it possible to suppress a decrease in the cooling performance of the stator 30 and the rotor 20. This makes it possible to suppress an imbalance in the amount of cooling between the main body side (turbine side) including the stator 30 and rotor 20 of the rotating electric machine 1 and the exciter 100 side.

[0059] The housing 10 also has a base portion 11 and an exciter outlet duct 65 (duct). The base portion 11 is provided with a first chamber 10a, a second chamber 10b, and a third chamber 10c. The exciter outlet duct 65 is detachably coupled to the base portion 11, connects the third chamber 10c and the first chamber 10a, and guides the cooling gas that has passed through the exciter 100 from the third chamber 10c to the first chamber 10a. The second cooler 66B is provided inside 10n of the exciter outlet duct 65.

[0060] According to such a configuration, the second cooler 66B can be removed from the base portion 11 by removing the exciter outlet duct 65 from the base portion 11, which makes it easy to perform maintenance, etc., on the second cooler 66B.

[0061] Further, the second cooler 66B is disposed in such a position that the inlet 66c and the outlet 66d do not face the housing 10 other than the exciter outlet duct 65.

[0062] Therefore, a configuration in which the pipes 201 and 202 do not interfere with the housing 10 other than the exciter outlet duct 65 can be easily realized.

[0063] In the above embodiment, the second cooler 66B is provided inside the exciter outlet duct 65, but the present invention is not limited to this. For example, the second cooler 66B may be provided in the first chamber 10a so as to be located downstream of the exciter 100 and upstream of the stator 30 and the rotor core 22 in the flow direction of the cooling gas.

[0064] 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]

[0065] 1...rotating electric machine, 10...housing body, 10a...first chamber, 10b...second chamber, 10c...third chamber, 10n...inside, 11...base portion, 20...rotor (first rotor), 21...shaft, 22...rotor core, 25b...inner fan, 30...stator (first stator), 65...exciter outlet duct (duct), 66A...first cooler, 66B...second cooler, 100...exciter, 121...exciter rotor, 122...exciter stator.

Claims

1. a container having a first chamber, a second chamber communicating with the first chamber, and a third chamber communicating with the first chamber and the second chamber, the container containing a gas therein; a first stator housed in the first chamber and fixed to the housing; a first rotor including a shaft, a portion of which is located inside the first stator and rotatable relative to the housing, and a rotor core, which is located inside the first stator and rotates integrally with the shaft; an exciter housed in the third chamber and a portion of which rotates integrally with the shaft; an internal fan provided on the shaft and rotating integrally with the shaft to generate a flow of the gas that passes from the first chamber through the second chamber to the third chamber and returns from the third chamber to the first chamber; a first cooler housed in the second chamber and configured to cool the gas; a second cooler that is accommodated in the accommodation body and is located downstream of the excitation device and upstream of the first stator and the rotor core in the flow direction of the gas, and that cools the gas; A rotating electric machine equipped with the above structure.

2. The container is a base portion provided with the first chamber, the second chamber, and the third chamber; a duct that is detachably coupled to the base portion, connects the third chamber and the first chamber, and guides the gas that has passed through the exciter from the third chamber to the first chamber; Equipped with The second cooler is provided inside the duct. The rotating electric machine according to claim 1 .

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