Rotating electric machine housing, rotating electric machine, and additive manufacturing method

Abstract

To provide a rotary electric machine housing which effectively utilizes a gas occurring in an internal combustion engine as a refrigerant to be supplied to the housing, and a rotary electric machine, and to provide a lamination molding method by which the rotary electric machine housing is molded.SOLUTION: A housing 40 may house a rotor 20 and a stator 30 of a power generator 1. The housing 40 includes: a hollow body part 41; a gas passage 61 which is provided at the body part 41 and communicates with a gas outflow port of a gas-turbine engine 2 connected to the power generator 1; and a refrigerant passage 62 which cools a gas flowing in the gas passage 61. The gas passage 61 communicates with a storage space S1 of the body part 41.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a rotating electric machine housing, a rotating electric machine, and an additive manufacturing method. [Background technology]

[0002] In recent years, research and development has been conducted to contribute to energy efficiency, ensuring that more people have access to affordable, reliable, sustainable and advanced energy.

[0003] In rotating electrical machines such as motors and generators, it is necessary to suppress a decrease in output power in order to improve energy efficiency. Because output power decreases when the rotating electrical machine becomes hot, it is necessary to provide a cooling mechanism in the rotating electrical machine to suppress the decrease in output power. For example, Patent Document 1 discloses a method of cooling the motor by flowing cooling water through a water jacket provided in the motor housing. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2017-28798 Summary of the Invention [Problem to be solved by the invention]

[0005] Incidentally, rotating electric machines are sometimes coupled to internal combustion engines such as gas turbine engines. When considering energy efficiency improvements for rotating electric machines, it may be effective to focus not only on the energy of the rotating electric machine, but also on the energy of the entire system including the rotating electric machine and the internal combustion engine. For example, it may be possible to effectively utilize high-temperature gases generated in the internal combustion engine (e.g., high-temperature compressed air generated by compression in the compressor of the internal combustion engine) for the rotating electric machine.

[0006] The present invention provides a rotating electric machine housing and a rotating electric machine that utilize gas generated by an internal combustion engine as a coolant to be supplied to the inside of the rotating electric machine housing, and also provides an additive manufacturing method for manufacturing such a rotating electric machine housing. [Means for solving the problem]

[0007] [1] The present invention provides A rotating electric machine housing capable of accommodating components of a rotating electric machine, a hollow body portion having an accommodation space for accommodating the component; a gas flow path provided in the main body and communicating with a gas outlet of an internal combustion engine connected to the rotating electric machine; a cooling unit that cools the gas flowing through the gas flow path, the cooling unit is a refrigerant flow path provided along the gas flow path, through which a refrigerant flows, and heat exchange occurs between the refrigerant flowing in the refrigerant flow path and the gas flowing in the gas flow path; the gas flow path communicates with the accommodation space of the main body, The main body portion has a portion that protrudes radially outward from an outer circumferential surface, The refrigerant flow path and the gas flow path teeth, The main body portion It is provided integrally with the protruding portion. The present invention also provides A rotating electric machine housing capable of accommodating components of a rotating electric machine, a hollow body portion having an accommodation space for accommodating the component; a gas flow path provided in the main body and communicating with a gas outlet of an internal combustion engine connected to the rotating electric machine; a cooling unit that cools the gas flowing through the gas flow path, the gas flow path communicates with the accommodation space of the main body, the cooling unit is a refrigerant flow path provided along the gas flow path and through which a refrigerant flows, the refrigerant flowing through the refrigerant flow path and the gas flowing through the gas flow path exchange heat with each other, When viewed from a cross section perpendicular to the gas flow direction, the gas flow path ,thousand Arranged in a bird-like pattern, The plurality of coolant channels are arranged between and / or around the gas channels so as to surround the gas channels.

[0008] [2] The present invention also provides [1] A rotating electric machine housing; a rotor and a stator housed in the main body, The rotor shaft of the rotor is connected to the rotary shaft of the internal combustion engine.

[0009] [3] The present invention also provides [1] An additive manufacturing method for additively manufacturing the rotating electric machine housing according to [1] using powdered metal, The main body, the gas flow path, and the cooling portion are integrally formed. [Effects of the Invention]

[0010] According to the present invention, gas generated in an internal combustion engine can be utilized as a coolant to be supplied to the inside of a housing of a rotating electrical machine. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 2 is a cross-sectional view of the generator 1. [Figure 2] FIG. 2 is a perspective view of a housing 40 of the generator 1. [Figure 3] 2, showing a gas flow path 61 and a refrigerant flow path 62. FIG. [Figure 4] FIG. 2 is an enlarged cross-sectional view of the vicinity of a bearing 52. DETAILED DESCRIPTION OF THE INVENTION

[0012] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a rotating electrical machine according to the present invention will now be described with reference to the drawings.

[0013] 1, a generator 1, which is an example of a rotating electric machine of the present invention, includes a rotor shaft 10, a rotor 20 that rotates integrally with the rotor shaft 10, a stator 30 that is disposed at a predetermined radial distance from the outer circumferential surface of the rotor 20, a housing 40 that accommodates the rotor 20 and the stator 30, and a pair of bearings 51, 52 that are disposed on one end and the other end in the axial direction across the rotor 20 and support the rotor shaft 10 rotatably relative to the housing 40. A permanent magnet (not shown) is attached to the rotor 20, and the stator 30 has a stator core 31 around which a coil 32 is wound.

[0014] A gas turbine engine 2, which is an example of an internal combustion engine, is connected to the generator 1. Although not shown, the gas turbine engine 2 burns air compressed by a compressor and fuel (jet fuel, etc.) in a combustion chamber, and rotates a turbine with the exhaust flow generated when the high-temperature, high-pressure combustion gas is exhausted. The turbine is coaxially connected to a turbine connector 11 provided on a rotor shaft 10 of the generator 1, and the rotor shaft 10 rotates due to the rotation of the turbine. In other words, the generator 1 and the gas turbine engine 2 constitute a power generation system 100, and the generator 1 generates power using the output of the gas turbine engine 2. Note that, hereinafter, the gas turbine engine 2 side in the axial direction of the generator 1 will also be referred to as a first end side, and the opposite side will also be referred to as a second end side.

[0015] A portion of the high-temperature, high-pressure air (hereinafter also simply referred to as gas) generated by compression in the compressor of the gas turbine engine 2 flows through a gas outlet passage (not shown) of the gas turbine engine 2 and is supplied to a gas inlet 60 of the housing 40, which will be described later. Note that combustion gas exhausted from the gas turbine engine 2 may be supplied to the gas inlet 60 of the housing 40 through a purification filter or the like.

[0016] The housing 40 has a hollow main body 41 and a flange 42 provided at an end portion on the first end side of the main body 41. The main body 41 has a substantially cylindrical shape and has an internal storage space S1 that stores components such as the rotor 20, the stator 30, and bearings 51 and 52. The flange 42 is fixed to the gas turbine engine 2.

[0017] A hole through which the rotor shaft 10 can be inserted is formed in the main body 41 and the flange 42, and bearing holders 43, 44 are disposed in the hole. The bearing holders 43, 44 are provided at the first and second ends of the housing 40, respectively, and hold the bearings 51, 52. That is, the bearing holders 43, 44 support the bearings 51, 52, which rotatably support the rotor shaft 10, relative to the housing 40. The bearing holders 43, 44 are also provided with oil flow paths and oil jet nozzles (not shown) that supply oil to the bearings 51, 52, and the bearings 51, 52 are lubricated by oil.

[0018] The housing 40 further has a gas inlet 60 for cooling gas generated by the gas turbine engine 2 and supplying the cooled gas to the accommodation space S1 of the housing 40. As will be described in detail later, the gas supplied to the accommodation space S1 is effectively used for cooling the rotor 20 and the stator 30, etc.

[0019] 2, the gas introduction part 60 is integrally provided with the main body part 41 and protrudes radially outward from the outer peripheral surface of the main body part 41. The gas introduction part 60 extends spirally in the axial direction from the first end side to the second end side. The thick arrows (solid lines and dashed lines) shown in FIG. 1 indicate the flow of gas.

[0020] As shown in FIG. 3, inside the gas inlet part 60, a gas flow path 61 through which the gas flows and a coolant flow path 62 through which a coolant (for example, cooling water) for cooling the gas flows are formed.

[0021] A plurality of gas flow paths 61 are provided in the gas inlet part 60, and each gas flow path 61 has a cross section in the shape of a hexagram. The gas flow paths 61 extend along the gas inlet part 60, that is, extend spirally in the axial direction from the first end side to the second end side.

[0022] An inlet 61a of the gas flow passage 61 communicates with a gas outlet of the gas turbine engine 2, and an outlet 61b of the gas flow passage 61 communicates with the accommodation space S1 of the housing 40. The gas exchanges heat with the refrigerant flowing through the refrigerant flow passage 62 while flowing from the inlet 61a to the outlet 61b, and is cooled.

[0023] A plurality of refrigerant flow paths 62 are provided in the gas inlet portion 60, and each refrigerant flow path 62 has a regular hexagonal cross section. Like the gas flow paths 61, the refrigerant flow paths 62 extend along the gas inlet portion 60, i.e., extend spirally from the first end to the second end in the axial direction of the generator 1. When viewing the cross section of the gas inlet portion 60 as shown in FIG. 3, the gas flow paths 61 are arranged in a zigzag or staggered pattern, and the refrigerant flow paths 62 are arranged between and / or around the gas flow paths 61. In this way, a plurality of refrigerant flow paths 62 are arranged to surround one gas flow path 61, thereby improving the gas cooling efficiency.

[0024] Although not shown, the inlet 62a and outlet 62b of the refrigerant flow path 62 communicate with an external refrigerant flow path provided outside the housing 40. A heat exchanger and a pump are separately provided in the external refrigerant flow path. With this configuration, the refrigerant circulates through the flow path formed by the refrigerant flow path 62 and the external refrigerant flow path, and a refrigerant capable of cooling the gas is supplied to the refrigerant flow path 62 of the gas inlet 60. Note that the refrigerant may be configured to flow from the second end side to the first end side within the refrigerant flow path 62.

[0025] In this way, the gas flow path 61 and the refrigerant flow path 62 are provided integrally with the main body 41, so the gas cooling mechanism is integrated into the main body 41 of the housing 40. Therefore, there is no need to provide a separate cooling mechanism for the gas flow path 61, which leads to a reduction in the weight of the generator 1. Also, since the refrigerant flow path 62 extends from the first end to the second end along the gas flow path 61, the gas is cooled efficiently and sufficiently along the gas flow path 61. Furthermore, since the gas flow path 61 and the refrigerant flow path 62 are provided in a spiral shape, a sufficient flow path length can be ensured between the first end and the second end, and gas cooling can be further promoted.

[0026] 1, the gas discharged from the outlet 61b of the gas flow path 61 is supplied to the accommodation space S1 on the second end side. The gas discharged to the accommodation space S1 is supplied to a gap 63 between the rotor 20 and the stator 30, which is a so-called air gap, and flows through the gap 63 from the second end side to the first end side, thereby cooling the rotor 20 and the stator 30.

[0027] In this way, the housing 40 of the generator 1 has a coolant flow path 62 that appropriately cools the gas of the gas turbine engine 2, and the gas can be used to cool the rotor 20 and the stator 30. Therefore, the energy efficiency of the entire power generation system 100 including the generator 1 and the gas turbine engine 2 can be improved.

[0028] The accommodation space S1 communicates with bearing arrangement spaces S2, S3 in which the bearings 51, 52 are arranged (that is, the gaps between the bearing holders 43, 44 and the rotor shaft 10), and the gas also flows into the bearing arrangement spaces S2, S3.

[0029] 1, showing the vicinity of the bearing arrangement space S3 in which the bearing 52 is arranged, with the gas flow indicated by a solid line and the oil flow indicated by a dashed line. Note that the bearing arrangement space S2 in which the bearing 51 is arranged has a similar configuration, and therefore a description thereof will be omitted.

[0030] As described above, oil for lubrication is supplied to the bearing 52, and the oil flows in the bearing arrangement space S3. The bearing holder 44 is provided with the oil discharge path 45 on the first end side (i.e., on the rotor 20 side) of the bearing 52, and therefore the oil flowing in the bearing arrangement space S3 is discharged from the oil discharge path 45 to the outside of the bearing arrangement space S3.

[0031] However, there is a risk that some of the oil flowing through the bearing arrangement space S3 will flow into the accommodation space S1. If the oil flows into the accommodation space S1 and enters the gap 63, friction will occur due to the oil present in the gap 63 when the rotor 20 rotates, resulting in a decrease in output.

[0032] In this embodiment, the gas flowing within the accommodation space S1 flows toward the bearing arrangement space S3, so the oil supplied to the bearing 52 does not enter the accommodation space S1, thereby preventing the occurrence of friction as described above. Therefore, the rotor 20 can rotate under high load and / or high rotation speed conditions. Furthermore, the bearing 52 is cooled by the gas, so damage to the bearing 52, which can become hot due to high-speed rotation, can be prevented. The oil flowing through the oil discharge path 45 is discharged to the outside together with the gas from the oil discharge port 46.

[0033] The flow path provided between the gas outlet of the gas turbine engine 2 and the inlet of the gas flow path 61 branches, and a first end-side flow path 64 is provided through which gas supplied from the gas outlet flows toward the turbine connection part 11. The outlet 64a of the first end-side flow path 64 communicates with the bearing arrangement space S2. With this configuration, the gas flows toward the bearing arrangement space S2, preventing oil supplied to the bearing 51 from flowing to the gas turbine engine 2 via the turbine connection part 11. This prevents friction caused by the oil from occurring and reducing the output of the gas turbine engine 2.

[0034] The housing 40 of this embodiment can be manufactured by metal additive manufacturing (AM), i.e., 3D printing, using powdered metal. AM is a well-known molding technique that melts metal powder using an electron beam or fiber laser and solidifies it in layers to produce metal parts. It enables the molding of metal components with complex three-dimensional shapes, enabling the creation of fine, dense 3D shapes. 3D printing AM allows the gas flow path 61 and the refrigerant flow path 62 to be integrally formed with the main body 41. That is, the housing 40 can be formed as a single component including the main body 41, flange 42, gas flow path 61, and refrigerant flow path 62, contributing to reducing the weight and manufacturing costs of the housing 40. Furthermore, 3D printing AM allows the flow path lengths and dimensions of the gas flow path 61 and the refrigerant flow path 62 to be easily designed. Furthermore, it allows the creation of complex shapes for the gas flow path 61 and the refrigerant flow path 62, allowing for efficient gas cooling.

[0035] Although one embodiment of the present invention has been described above with reference to the accompanying drawings, it goes without saying that the present invention is not limited to such an embodiment. It is clear that a person skilled in the art can conceive of various modifications or alterations within the scope of the claims, and it is understood that these also naturally fall within the technical scope of the present invention. Furthermore, the components of the above embodiment may be combined in any manner without departing from the spirit of the invention.

[0036] For example, in the above-described embodiment, the generator 1 is used as an example of the rotating electric machine of the present invention, but the present invention is not limited to this. The rotating electric machine of the present invention may be a motor as a drive source.

[0037] In the above-described embodiment, the gas turbine engine 2 is used as an example of the internal combustion engine connected to the rotating electric machine of the present invention, but the present invention is not limited to this. The internal combustion engine may be an internal combustion engine other than a gas turbine engine (for example, a reciprocating engine).

[0038] In the above-described embodiment, a configuration has been described in which high-temperature gas generated in the gas turbine engine 2 coaxially connected to the generator 1 is supplied to the generator 1, but the present invention is not limited to this. For example, a configuration may be used in which gas is supplied to the generator 1 from a gas outlet of a compressor provided separately from the gas turbine engine 2.

[0039] In the above-described embodiment, the refrigerant flow path 62 is provided along the gas flow path 61 as a mechanism for cooling the gas flowing through the gas flow path 61, but this is not limiting. For example, a cooling mechanism such as a water jacket may be provided in the main body 41 to cool the gas flowing through the gas flow path 61. Furthermore, when both the refrigerant flow path 62 and the water jacket are provided, the refrigerant flowing through the refrigerant flow path 62 may be supplied from the water jacket.

[0040] In the above-described embodiment, the gas inlet part 60 has a configuration in which the gas flow path 61 and the refrigerant flow path 62 are formed in a solid cross section, but this is not limited thereto. The gas flow path 61 and the refrigerant flow path 62 may be formed of pipes or the like.

[0041] In the above-described embodiment, the cross section of the gas flow path 61 is shaped like a six-pointed star, and the cross section of the refrigerant flow path 62 is shaped like a hexagon, but they are not limited to this and may have any shape. In addition, their arrangement may also be designed as desired.

[0042] This specification describes at least the following items. Note that the components in parentheses correspond to those in the above-described embodiment, but are not limited to these.

[0043] (1) A rotating electric machine housing (housing 40) capable of accommodating components (rotor 20, stator 30, bearings 51, 52) of a rotating electric machine (generator 1), a hollow main body portion (main body portion 41) having an accommodation space (accommodation space S1) for accommodating the component; a gas flow path (gas flow path 61) provided in the main body and communicating with a gas outlet of an internal combustion engine (gas turbine engine 2) connected to the rotating electric machine; a cooling unit (coolant flow path 62) that cools the gas flowing through the gas flow path, The gas flow path communicates with the accommodation space of the main body.

[0044] According to (1), the housing includes a gas flow path communicating with a gas outlet of the internal combustion engine and a cooling section for cooling the gas flowing through the gas flow path, and the gas flow path communicates with the accommodation space of the main body. This allows the gas from the internal combustion engine to be used to cool the components of the rotating electrical machine. This improves the energy efficiency of the entire power generation system including the rotating electrical machine and the internal combustion engine.

[0045] (2) The rotating electrical machine housing according to (1), The cooling section is provided integrally with the main body section together with the gas flow path.

[0046] According to (2), the cooling section is provided integrally with the main body together with the gas flow path, so the gas cooling section is integrated into the main body of the housing. Therefore, it is not necessary to provide a separate cooling section in the rotating electric machine, which leads to a reduction in the weight of the rotating electric machine.

[0047] (3) A rotating electrical machine housing according to (1) or (2), The cooling portion is a refrigerant flow path (refrigerant flow path 62) that is provided along the gas flow path and through which a refrigerant flows.

[0048] According to (3), the coolant flow path is provided along the gas flow path, so that the gas is cooled efficiently along the gas flow path.

[0049] (4) The rotating electrical machine housing according to (3), the gas flow path and the refrigerant flow path extend in the axial direction of the rotating electric machine from one end side (first end side) where the internal combustion engine is provided to the other end side (second end side); The other end of the gas flow passage communicates with the accommodation space of the main body of the rotary electric machine housing.

[0050] According to (4), the gas flow path and the coolant flow path extend in the axial direction of the rotating electrical machine from one end where the internal combustion engine is provided to the other end, so that the gas is sufficiently cooled along the gas flow path.

[0051] (5) The rotating electrical machine housing according to (4), The gas flow path and the refrigerant flow path are spirally provided in the main body portion of the rotating electrical machine housing.

[0052] According to (5), the gas flow path and the refrigerant flow path are spirally formed in the main body, so that a sufficient flow path length can be ensured from one end to the other end, and the cooling of the gas can be further promoted.

[0053] (6) A rotating electric machine housing according to any one of (1) to (5), The rotating electric machine housing, wherein the main body portion, the gas flow path, and the cooling portion are integrally formed by additive manufacturing using powdered metal.

[0054] According to (6), the main body, gas flow path, and cooling part can be integrally formed by additive manufacturing using powder metal. This contributes to weight reduction and reduced manufacturing costs. In addition, the length of the gas flow path and the dimensions of the cooling part can be easily designed. Furthermore, it is possible to create gas flow paths and cooling parts with complex shapes that can efficiently cool the gas.

[0055] (7) A rotating electrical machine housing (housing 40) according to any one of (1) to (6), A rotating electric machine (generator 1) including a rotor (rotor 20) and a stator (stator 30) housed in the main body, A rotor shaft (rotor shaft 10) of the rotor is connected to the rotating shaft of the internal combustion engine, forming a rotating electric machine.

[0056] According to (7), the gas from the internal combustion engine can be used to cool the rotor and the stator, thereby improving the energy efficiency of the entire power generation system including the rotating electrical machine and the internal combustion engine.

[0057] (8) The rotating electric machine according to (7), The gas discharged from the gas flow path to the accommodation space is supplied to a gap (gap 63) between the stator and the rotor, in this rotating electric machine.

[0058] According to (8), the gas discharged from the gas flow path into the accommodation space is supplied to the gap between the stator and the rotor, so that the gas from the internal combustion engine can be used to cool the rotor and the stator.

[0059] (9) A rotating electric machine according to (7) or (8), further comprising bearings (bearings 51, 52) provided in the main body portion and supporting the rotor shaft relative to the main body portion; The gas discharged from the gas flow path to the accommodation space is supplied to spaces in which the bearings are provided (bearing arrangement spaces S2, S3).

[0060] According to (9), the gas discharged from the gas flow path into the housing space is supplied to the space where the bearing is installed, so the oil supplied to the bearing does not enter the housing space where the stator and rotor are housed. This prevents a decrease in output due to friction caused by oil present in the gap between the rotor and stator when the rotor rotates. In addition, the gas cools the bearing, preventing damage to the bearing, which can become hot during high-speed rotation.

[0061] (10) An additive manufacturing method for additively manufacturing the rotating electric machine housing according to any one of (1) to (5) using powdered metal, comprising: An additive manufacturing method in which the main body portion, the gas flow path, and the cooling portion are integrally formed.

[0062] According to (10), the main body, gas flow path, and cooling part can be integrally formed by additive manufacturing using powder metal. This contributes to weight reduction and reduced manufacturing costs. In addition, the length of the gas flow path and the dimensions of the cooling part can be easily designed. Furthermore, it is possible to create gas flow paths and cooling parts with complex shapes that can efficiently cool the gas. [Explanation of symbols]

[0063] 1. Generator (rotating electric machine) 2. Gas turbine engine (internal combustion engine) 10 rotor shaft 20 rotors 30 Stator 40 Housing (rotating electrical machine housing) 41 Main body 51, 52 Bearings 61 Gas flow path 62 Coolant flow path (cooling section) 63 Gap S1 Containment Space S2, S3 bearing placement space

Claims

1. A rotating electric machine housing capable of accommodating components of a rotating electric machine, a hollow body portion having an accommodation space for accommodating the component; a gas flow path provided in the main body and communicating with a gas outlet of an internal combustion engine connected to the rotating electric machine; a cooling unit that cools the gas flowing through the gas flow path, the cooling unit is a refrigerant flow path provided along the gas flow path, through which a refrigerant flows, and heat exchange occurs between the refrigerant flowing in the refrigerant flow path and the gas flowing in the gas flow path; the gas flow path communicates with the accommodation space of the main body, The main body portion has a portion that protrudes radially outward from an outer circumferential surface, The refrigerant flow path and the gas flow path are integrally provided in the protruding portion of the main body.

2. A rotating electric machine housing capable of accommodating components of a rotating electric machine, a hollow body portion having an accommodation space for accommodating the component; a gas flow path provided in the main body and communicating with a gas outlet of an internal combustion engine connected to the rotating electric machine; a cooling unit that cools the gas flowing through the gas flow path, the gas flow path communicates with the accommodation space of the main body, the cooling unit is a refrigerant flow path provided along the gas flow path, through which a refrigerant flows, and heat exchange occurs between the refrigerant flowing in the refrigerant flow path and the gas flowing in the gas flow path; the gas flow paths are arranged in a staggered pattern when viewed in a cross section perpendicular to the gas flow direction, The rotating electric machine housing has a plurality of the refrigerant flow paths arranged between and / or around the gas flow paths so as to surround the gas flow paths.

3. 3. The rotating electrical machine housing according to claim 2, The cooling section is provided integrally with the main body section together with the gas flow path.

4. 4. The rotating electrical machine housing according to claim 2 or 3, the gas flow path and the refrigerant flow path extend in an axial direction of the rotary electric machine from one end where the internal combustion engine is provided to the other end, The other end of the gas flow passage communicates with the accommodation space of the main body.

5. 5. The rotating electrical machine housing according to claim 4, The gas flow path and the refrigerant flow path are spirally provided in the main body portion of the rotating electrical machine housing.

6. The rotating electrical machine housing according to any one of claims 1 to 5, The rotating electric machine housing, wherein the main body portion, the gas flow path, and the cooling portion are integrally formed by additive manufacturing using powdered metal.

7. A rotating electrical machine housing according to any one of claims 1 to 6; a rotor and a stator housed in the main body, a rotor shaft of the rotor connected to a rotary shaft of the internal combustion engine;

8. 8. The rotating electric machine according to claim 7, The gas discharged from the gas flow path to the accommodation space is supplied to a gap between the stator and the rotor.

9. 9. A rotating electric machine according to claim 7 or 8, a bearing provided in the main body portion and supporting the rotor shaft relative to the main body portion; The gas discharged from the gas flow path to the accommodation space is supplied to a space in which the bearing is provided.

10. 6. An additive manufacturing method for additively manufacturing the rotating electric machine housing according to claim 1 using powdered metal, comprising: An additive manufacturing method in which the main body portion, the gas flow path, and the cooling portion are integrally formed.

11. 10. A rotating electric machine according to claim 7, a coupling portion that is coupled to the rotary shaft of the internal combustion engine is provided on one end side of the rotor shaft, The rotating electric machine includes: a bearing provided in the main body portion and supporting the rotor shaft relative to the main body portion; The bearing is supplied with oil, a flow path provided between the gas outlet of the internal combustion engine and the inlet of the gas flow path branches, and a one-end side flow path is provided through which the gas supplied from the gas outlet branches toward the connecting portion of the rotor shaft, the one-end side flow path being a flow path that is located at a position on the one end side of the one end side and the other end side of the rotor shaft; an outlet of the one-end-side flow path communicates with a bearing arrangement space in which the bearing is arranged.

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