Rotating 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] Embodiments of the present invention relate to a rotating electrical machine.

Background Art

[0002] Conventionally, a rotating electrical machine having a configuration in which a stator, a rotor, an excitation device, an inner fan, and a cooler are housed in a housing and the gas in the housing is circulated by the inner fan is known. In this rotating electrical machine, the stator, the rotor, and the excitation device are cooled by the gas cooled by the cooler.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] [[ID=;34]] In this type of rotating electrical machine, for example, as the output of the rotating electrical machine increases, an increase in the output of the excitation device is required. When the output of the excitation device increases, the amount of heat radiated by the excitation device increases, and the temperature of the gas flowing from the excitation device side to the stator and rotor sides rises, which may reduce the cooling performance of the stator and rotor by the gas.

[0005] Therefore, one of the problems of the present invention is to obtain a rotating electrical machine with a novel configuration that can suppress the reduction in the cooling performance of the stator and rotor.

Means for Solving the Problems

[0006] The rotating electric machine according to an embodiment of the present invention comprises a housing having a first chamber, a second chamber connected to the first chamber, and a third chamber connected to the first and second chambers, the housing having a gas inside, a first stator housed in the first chamber and fixed to the housing, a shaft having part of it located inside the first stator and rotatable relative to the housing, and a rotor core having part of it located inside the first stator and rotating integrally with the shaft, and a rotor housed in the third chamber, part of which The device comprises: an excitation device that rotates integrally with the shaft; an internal fan provided on the shaft and rotating integrally with the shaft to generate a flow of gas that enters the third chamber through the second chamber and returns from the third chamber to the first chamber; a first cooler housed in the second chamber for cooling the gas; and a second cooler housed in the housing, located downstream of the excitation device and upstream of the first stator and the rotor core in the direction of gas flow, for cooling the gas. The housing comprises a base portion having a first chamber, a second chamber, and a third chamber, and a duct detachably connected to the base portion, connecting the third chamber and the first chamber, and guiding the gas that has passed through the excitation device from the third chamber to the first chamber, and the second cooler is provided inside the duct. . [Effects of the Invention]

[0007] According to embodiments of the present invention, a novel rotating electric machine configuration can be obtained that can suppress a decrease in the cooling performance of the stator and rotor. [Brief explanation of the drawing]

[0008] [Figure 1] Figure 1 is a schematic diagram showing the configuration of a rotating electric machine according to an embodiment. [Figure 2] Figure 2 is a cross-sectional view showing a part of the rotating electric machine of the embodiment. [Figure 3] Figure 3 is a cross-sectional view showing a portion of the rotating electric machine of the embodiment that includes a second cooler. [Modes for carrying out the invention]

[0009] The following describes exemplary embodiments of the present invention. The configurations (technical features) of the embodiments shown below, as well as the actions and results (effects) brought about by such configurations, are examples only.

[0010] Furthermore, the drawings are schematic, and the dimensional relationships and proportions of each element may differ from reality. Also, there may be differences in dimensional relationships and proportions between drawings. In this specification, ordinal numbers are used solely to distinguish parts, components, locations, directions, etc., and do not indicate order or priority.

[0011] Figure 1 is a schematic diagram showing the configuration of the rotating electric machine 1 of the embodiment. Figure 2 is a cross-sectional view showing a part of the rotating electric machine 1 of the embodiment.

[0012] As shown in Figures 1 and 2, the rotating electric machine 1 comprises a housing 10, a rotor 20, a stator 30, internal fans 25a and 25b, a first cooler 66A, a second cooler 66B, and an excitation device 100. Hereafter, the cooler 66 will be used as a general term for the first cooler 66A and the second cooler 66B. In this specification, a brushless rotating electric machine will be used as an example, but 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 called a casing. The internal fans 25a and 25b are also called fans.

[0013] Each figure shows three mutually orthogonal directions. The X direction is along the longitudinal direction of the housing 10 and the axial direction of the rotational axis Ax of the rotor 20. The Y direction is along the transverse direction of the short direction of the housing 10 and the axial direction of the rotational axis Ax. The Z direction is along the vertical direction of the housing 10. The X, Y, and Z directions are mutually orthogonal. Here, the rotational axis Ax is the central axis (centerline) of the shaft 21 of the rotor 20. That is, the axial, radial, and circumferential directions of the rotational axis Ax are the same as the axial, radial, and circumferential directions of the shaft 21. In the following description, unless otherwise specified, the axial, radial, and circumferential directions refer to the axial, radial, and circumferential directions of the rotational axis Ax, i.e., the axial, radial, and circumferential directions of the shaft 21.

[0014] The interior 10n of the housing 10 is provided with a first chamber 10a, a second chamber 10b, and a third chamber 10c. The second chamber 10b is adjacent to and connected to the first chamber 10a. The third chamber 10c is adjacent to both the first chamber 10a and the second chamber 10b, and connected to both the first chamber 10a and the second chamber 10b. Specifically, the third chamber 10c is connected to the second chamber 10b via the excitation device inlet duct 64 and to the first chamber 10a via the excitation device outlet duct 65. In this way, the first chamber 10a, the second chamber 10b, and the third chamber 10c are connected to each other. The excitation device inlet duct 64 and the excitation device outlet duct 65 constitute the housing 10.

[0015] The first chamber 10a houses the rotor 20, stator 30, and internal fans 25a and 25b. The second chamber 10b houses the first cooler 66A. The third chamber 10c houses the excitation device 100. The excitation device 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 the cooling gas), which is a refrigerant. In other words, the interior 10n of the housing 10 is a closed space containing the cooling gas. The cooling gas is, for example, air. The gas circulates inside the housing 10n by the operation of the internal fans 25a and 25b. As the gas passes through the rotor 20, stator 30, and excitation device 100, it cools these parts. At this time, the gas heated by the heat of the above parts is cooled by heat exchange with cooling water (refrigerant) in the cooler 66, making it possible to cool the rotor 20, stator 30, and excitation device 100 again.

[0017] Furthermore, the first chamber 10a is provided with a connecting-side bearing 45a and an exciter-side bearing 45b. The first chamber 10a is also provided with a connecting-side bearing bracket 55a and an exciter-side bearing bracket 55b. The connecting-side bearing 45a is fixed to the connecting-side bearing bracket 55a, and the exciter-side bearing 45b is fixed to the exciter-side bearing bracket 55b.

[0018] In addition, the container 10 is 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 partitions the first chamber 10a and 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 spaced apart from the outer peripheral surface of the shaft 21 passing through the first hole 16 with a first gap in the radial direction. Note that the partition wall portion 15 is also referred to as an oil seal 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 radially surrounds the exciter side bearing 45b. Further, the partition wall portion 15 attached to the exciter side bearing bracket 55b axially surrounds the exciter side bearing 45b. The exciter side bearing bracket 55b and the partition wall portion 15 form an exciter side bearing sealing portion 56b that radially and axially surrounds the exciter side bearing 45b. The exciter side bearing sealing portion 56b is filled with lubricating oil and is also referred to as, for example, an oil box.

[0020] As shown in FIG. 1, the partition wall portion 67 is located between the first chamber 10a and the second chamber 10b and partitions the first chamber 10a and the second chamber 10b. The partition wall portion 67 is provided with a cooler inlet opening 51a and cooler outlet openings 51b, 51c.

[0021] The rotor 20 has a shaft 21, a rotor core 22, and a rotor winding 23 (field winding). The shaft 21 extends along the rotation center axis Ax across the first chamber 10a and the third chamber 10c and is rotatably supported about the rotation center axis Ax by the connecting side bearing 45a and the exciter side bearing 45b. Further, a connecting portion 13 is formed at one end of the shaft 21. The shaft 21 is coupled at the connecting portion 13 to the drive object when the rotating electrical machine 1 is a motor and to the prime mover when the rotating electrical machine is a generator.

[0022] The rotor core 22 is formed in a cylindrical shape around the rotation center axis Ax. The rotor core 22 has, for example, a laminated structure in which disk-shaped steel plates made of a ferromagnetic material and having an opening at the center are laminated in the axial direction. The rotor core 22 is attached to the outside in the radial direction of the shaft 21 in the first chamber 10a. A rotor winding 23 is provided on the rotor core 22. The rotor winding 23 is fixed to the rotor core 22. Specifically, the rotor winding 23 is fixed to the rotor core 22 in a state of penetrating 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 around the rotation center axis Ax integrally with the shaft 21 to generate an air flow throughout the first chamber 10a and thus the entire interior 10n of the housing 10. More specifically, at least the inner fan 25b rotates integrally with the shaft 21 to cause a flow of cooling 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 rotor core 22 is located between the inner fan 25a and the inner fan 25b.

[0024] As shown in FIG. 1, the stator 30 is provided outside the rotor 20 in the radial direction 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, for example, a laminated structure in which disk-shaped steel plates made of a ferromagnetic material and having an opening at the center are laminated in the axial direction. Slots (not shown) that extend in the axial direction with a space from each other in the circumferential direction of the rotation center axis Ax are formed inside the stator core 31 facing the outside in the radial direction of the rotor core 22. The stator winding 32 is provided in each slot and on both outer sides in the axial direction of the stator core 31.

[0025] The housing 10 has a cooler cover 62 above the first chamber 10a. The cooler cover 62 houses the first cooler 66A. The first cooler 66A is, for example, a heat exchanger. The space inside the first chamber 10a and the cooler cover 62 are connected by 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 within the first chamber 10a. Circular openings are formed in the partition plates 51d and 51f, penetrating them in the axial direction.

[0027] The partition plate 51d is provided in the axial direction between the stator core 31 and the connecting side bearing 45a. The partition plate 51f is provided in the axial direction between the stator core 31 and the exciter side bearing 45b.

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

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

[0030] As shown in Figure 2, the rotating body 110 has, for example, a rotating rectifier 115. The rotating rectifier 115 has, for example, a plurality of rectifiers that are arranged at equal intervals in the circumferential direction and extend radially. The rotating body 110 is mounted on the excitation device shaft 26 in the third chamber 10c and is rotatable integrally with the excitation device shaft 26 about the rotational axis Ax.

[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 rotational axis Ax. The excitation stator 122 is positioned radially opposite the excitation rotor 121 and is fixed to the housing 10. DC power is supplied to the excitation stator 122 from the power supply. The excitation stator 122 is composed of an electromagnet made of windings. However, the excitation stator 122 is not limited to this. For example, if 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, it may be a permanent magnet.

[0033] The excitation rotor 121 includes 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 rotational axis Ax. The excitation rotor core 131 is a laminated structure in which disc-shaped steel plates made of ferromagnetic material and having an opening in the center are stacked in the axial direction. A spider 150 is placed inside the excitation rotor core 131 in the radial direction and fixed to the excitation device shaft 26 via the spider 150. The excitation rotor core 131 is also placed inside the excitation stator 122 in the radial direction. In addition, a plurality of slots are formed on the outer circumference of the excitation rotor core 131, extending axially at intervals from each other in the circumferential direction of the rotational axis Ax. Excitation rotor windings 132 are placed in these plurality of slots. The excitation rotor windings 132 are fixed to the excitation rotor core 131.

[0035] The spider 150 is an annular (cylindrical) shape around the rotational axis Ax, with the excitation device shaft 26 inserted radially inside it and fixed to the excitation device shaft 26. The spider 150 is also referred to as a bracket or fixing member.

[0036] As the excitation rotor 121 rotates around the rotational axis Ax inside the DC field of the excitation stator 122, an AC induced electromotive force is generated in the excitation rotor 121. The AC power generated in the excitation rotor winding 132 is converted into DC power by the rotary rectifier 115 and supplied to the rotor winding 23 (field winding) provided on the rotor core 22, which also rotates around the rotational 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 Figure 1, the housing 10 includes 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 partition walls 15 and 67 constitute the base portion 11. The base portion 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 connected to the base portion 11. As shown in Figure 2, for example, the excitation device outlet duct 65 is fixed to the base portion 11 by a connector 160 such as a bolt, and can be removed from the base portion 11 by removing the connector 160.

[0038] The excitation device cover 63 encloses the third chamber 10c. An excitation device inlet duct 64 is provided between the excitation device cover 63 and the cooler cover 62, connecting the excitation device cover 63 and the cooler cover 62. An excitation device outlet duct 65 is provided between the excitation device cover 63 and the exciter-side bearing bracket 55b, connecting the excitation device cover 63 and the exciter-side bearing bracket 55b.

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

[0040] The excitation device outlet duct 65 is provided with a flow path 59c that connects the first chamber 10a and the third chamber 10c. One end of the flow path 59c, the first open end 59a, opens into the upper end of the exciter-side bearing bracket 55b. As a result, the first open end 59a opens into the first chamber 10a. The other end of the flow path 59c, the second open end 59b, opens into the excitation device cover 63 at a position radially spaced away from the rotating body 110. As a result, the second open end 59b opens into the third chamber 10c. In this embodiment, the second open end 59b opens into the third chamber 10c at a position upwardly spaced away from the rotating body 110.

[0041] The excitation device inlet duct 64 is connected to the excitation device cover 63 at a position further away from the first chamber 10a than the excitation device outlet duct 65. In the axial direction, the excitation device 120 is installed between the position where the excitation device inlet duct 64 is connected to the excitation device cover 63 and the second open end 59b.

[0042] The housing 10, comprising a frame 61, a cooler cover 62, an excitation device cover 63, an excitation device inlet duct 64, an excitation device outlet duct 65, etc., forms a sealed space 70 inside 10n. The sealed space 70 includes a first chamber 10a, a second chamber 10b, and a third chamber 10c. The sealed space 70 also includes an excitation device cover section 75, a central frame section 76, a cooler cover section 77, and fan inlet sections 78, 79. The excitation device cover section 75 is included in the third chamber 10c. The central frame section 76 and the fan inlet sections 78, 79 are included in the first chamber 10a.

[0043] The central part of the frame 76 is located between partition plates 51d and 51f and is the region where the rotor core 22 and stator 30 are provided. The fan inlet 78 is the part between the internal fan 25a and partition plate 51d and the connecting side bearing 45a. The fan inlet 79 is the part between the exciter side bearing 45b and the internal fan 25b and partition plate 51f. The fan inlet 79 communicates with the exciter cover 75 through the flow path 59c.

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

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

[0046] The first cooler 66A and the second cooler 66B are both composed of 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 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] The configuration of the cooler 66 will now be described with reference to Figures 2 and 3. Figure 3 is a cross-sectional view showing a portion of the rotating electric machine 1 of the embodiment that includes the second cooler 66B.

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

[0049] An inlet 66c and an outlet 66d are provided on the vertical wall 66b of the frame 66a. Pipes 201 and 202 are connected to the inlet 66c and outlet 66d, respectively. Pipes 201 and 202 penetrate the side wall 65a of the excitation device outlet duct 65. A sealing 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 coolant (refrigerant) such as water that flows from pipe 201 into the inlet 66c flows inside the cooling pipes and flows out of the outlet 66d into pipe 202. Here, the cooling water for the first cooler 66A and the second cooler 66B may be supplied by one shared cooling water supply device or by separate cooling water supply devices. In addition, in a configuration where cooling water is circulated, the cooling water from 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 then be distributed to the first cooler 66A and the second cooler 66B.

[0050] Furthermore, the vertical wall 66b of the frame 66a is provided with a drain port 66e and an air vent port 66f. The drain port 66e and the air vent port 66f are closed by covers.

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

[0052] The second cooler 66B is positioned such that its inlet 66c and outlet 66d do not face any of the housing 10 other than the excitation device outlet duct 65. That is, the second cooler 66B is positioned such that its inlet 66c and outlet 66d do not face the base 11 and the excitation device inlet duct 64. For example, the second cooler 66B is positioned such that its inlet 66c and outlet 66d face the side of the rotating electric machine 1.

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

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

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

[0056] When the cooling gas cools the excitation device 100, its temperature rises due to the heat from the excitation rotor 121 and excitation stator 122. As the heated cooling gas passes through the excitation device outlet duct 65, it is cooled by the second cooler 66B and becomes relatively cold. Subsequently, the cooling gas flows into the first chamber 10a from the fan inlet 79 and cools the stator 30 and rotor core 22 as it passes through them.

[0057] As described above, in this embodiment, the rotating electric machine 1 comprises a housing 10, a stator 30 (first stator), a rotor 20 (first rotor), an excitation device 100, an internal fan 25b, a first cooler 66A, and a second cooler 66B. The housing 10 has a first chamber 10a, a second chamber 10b connected to the first chamber 10a, and a third chamber 10c connected to the first chamber 10a and the second chamber 10b, which are provided inside 10n, and a cooling gas (gas) is contained inside 10n. The stator 30 is housed in the first chamber 10a and fixed to the housing 10. The rotor 20 has a shaft 21 which is partially located inside the stator 30 and rotatable relative to the housing 10, and a rotor core 22 which is located inside the stator 30 and rotates integrally with the shaft 21. The excitation device 100 is housed in the third chamber 10c, and a portion of it (excitation stator 122, rotor 110) rotates integrally with the shaft 21. The internal fan 25b is provided on the shaft 21 and rotates integrally with the shaft 21, thereby creating a gas flow 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 excitation device 100 and upstream of the stator 30 and rotor core 22 in the direction of the cooling gas flow, and cools the cooling gas.

[0058] With this configuration, even if the cooling gas cooled by the first cooler 66A rises in temperature due to the heat from the excitation device 100, the cooling gas is then cooled by the second cooler 66B. As a result, the cooling gas, now at a relatively low temperature, flows to the stator 30 and rotor core 22, thereby cooling the stator 30 and rotor core 22. Consequently, a decrease in the cooling performance of the stator 30 and rotor 20 can be suppressed. This prevents 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 excitation device 100 side.

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

[0060] With this configuration, the second cooler 66B can be removed from the base unit 11 by removing the excitation device outlet duct 65 from the base unit 11, making it easier to perform maintenance on the second cooler 66B.

[0061] Furthermore, the second cooler 66B is positioned such that its inlet 66c and outlet 66d do not face any of the housing 10 other than the excitation device outlet duct 65.

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

[0063] In the above embodiment, an example was shown in which the second cooler 66B is provided inside the excitation device outlet duct 65, but the 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 excitation device 100 and upstream of the stator 30 and rotor core 22 in the direction of the cooling gas flow.

[0064] While several embodiments of the present invention have been described, these embodiments are presented as examples only and are not intended to limit the scope of the invention. These novel embodiments can be carried out in a variety of other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their variations are included in the scope and spirit of the invention, as well as in the claims of the invention and its equivalents. [Explanation of Symbols]

[0065] 1... Rotating electric machine, 10... Housing, 10a... First chamber, 10b... Second chamber, 10c... Third chamber, 10n... Interior, 11... Base section, 20... Rotor (first rotor), 21... Shaft, 22... Rotor core, 25b... Internal fan, 30... Stator (first stator), 65... Excitation device outlet duct (duct), 66A... First cooler, 66B... Second cooler, 100... Excitation device, 121... Excitation rotor, 122... Excitation stator.

Claims

[Claim 1] A container comprising a first chamber, a second chamber connected to the first chamber, and a third chamber connected to the first and second chambers, with a gas contained within the container, A first stator housed in the first chamber and fixed to the housing, A first rotor having a shaft that is partially located inside the first stator and rotatable relative to the housing, and a rotor core that is located inside the first stator and rotates integrally with the shaft, An excitation device housed in the third chamber, a portion of which rotates integrally with the shaft, An internal fan is provided on the shaft and rotates integrally with the shaft to generate a flow of gas that enters the third chamber through the second chamber from the first chamber and returns to the first chamber from the third chamber. A first cooler, housed in the second chamber, cools the gas, A second cooler, housed in the aforementioned container and located downstream of the excitation device and upstream of the first stator and rotor core in the direction of gas flow, cools the gas. Equipped with, The aforementioned housing is A base portion provided with the first chamber, the second chamber, and the third chamber, A duct detachably connected to the base portion, connecting the third chamber and the first chamber, and guiding the gas that has passed through the excitation device from the third chamber to the first chamber, Equipped with, The second cooler is installed inside the duct, Rotating electric machine.

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