Method for manufacturing rotary electric machine

Abstract

When cooling the inside (X1) in the axial direction of at least one of a stator coil end portion (12) and a phase ring (6), the relative ratio of the outside diameter (D1) of an axial flow fan (23) to the outside diameter (D2) of an axial outer end portion (22A) of a holding ring is increased, and when the outside (X2) in the axial direction of at least one of the stator coil end portion (12) and the phase ring (6) is cooled, the relative ratio of the outside diameter (D1) of the axial flow fan (23) to the outside diameter (D2) of the axial outer end portion (22A) of the holding ring is reduced.

Description

Manufacturing method of rotating electric machine

[0001] The present application relates to a method for manufacturing a rotating electrical machine.

[0002] 2. Description of the Related Art Conventionally, there has been a turbine generator in which cooling air from a cooler is introduced into the interior of the turbine generator by a fan provided on the rotor shaft of the turbine generator to cool the generator body.

[0003] Japanese Patent Application Publication No. 8-205473

[0004] In conventional technology, no consideration was given to controlling the flow path of the cooling air flowing to the stator coil end portion or phase ring of a rotating electric machine, and increasing the amount of cooling air flowing to areas where electrical loss is high.

[0005] The present application discloses technology for solving the above-mentioned problems, and aims to provide a method for manufacturing a rotating electric machine that can control the flow path of cooling air flowing to the stator coil end portion or phase ring of the rotating electric machine, thereby increasing the amount of cooling air flowing to areas where electrical loss is high.

[0006] The method for manufacturing a rotating electric machine disclosed in the present application is a method for manufacturing a rotating electric machine including: a stator having a stator core, a stator coil provided in the stator core, and stator coil end portions protruding from the axial end of the stator core; a rotor having a rotor coil provided on a rotor shaft opposite an inner peripheral portion of the stator core and a retaining ring that holds the axial end of the rotor coil; an axial fan provided on the rotor shaft axially outboard of the retaining ring; and a phase ring provided radially outboard of the stator coil end portions and connected to the stator coil end portions, wherein when cooling the axially inboard sides of at least one of the stator coil end portions and the phase ring, the relative ratio of the outer diameter of the axial fan to the outer diameter of the axially outboard end of the retaining ring is increased, and when cooling the axially outboard sides of at least one of the stator coil end portions and the phase ring, the relative ratio of the outer diameter of the axial fan to the outer diameter of the axially outboard end of the retaining ring is decreased.

[0007] According to the manufacturing method of a rotating electric machine disclosed in the present application, the flow path of the cooling air flowing to the stator coil end portion or phase ring of the rotating electric machine can be controlled, and the amount of cooling air flowing to areas where electrical loss is high can be increased.

[0008] FIG. 2A is a partial cross-sectional view showing a schematic configuration of a rotating electric machine according to an embodiment of the present application. FIG. 2A and FIG. 2B are schematic diagrams showing the connection relationship between stator coil end portions and phase rings. FIG. 2B is a partial cross-sectional view showing the main flow of cooling air in the stator coil end portions and phase rings of a rotating electric machine. FIG. 2C is a diagram explaining the cooling positions of the stator coil end portions and phase rings of a rotating electric machine. FIG. 2D is a partial cross-sectional view for explaining a manufacturing method of a rotating electric machine according to a first embodiment of the present application. FIG. 7A and FIG. 7B are diagrams obtained by analyzing, by numerical calculation, the flow of cooling air around the stator coil end portions and phase rings when the outer diameter of the axial fan is relatively small and large. FIG. 7C is a partial cross-sectional view for explaining a manufacturing method of a rotating electric machine according to a second embodiment of the present application. FIG. 7D is a partial cross-sectional view for explaining a manufacturing method of a rotating electric machine according to a third embodiment of the present application.

[0009] The present disclosure aims to control the airflow path of cooling air within a rotating electrical machine, and actively direct cooling air to areas of the stator coil end or phase ring where the temperature becomes high, by changing the relationship between the outer diameter of an axial flow fan attached to the rotor shaft of a rotating electrical machine such as a turbine generator and the outer diameter of the axially outboard end of a retaining ring that holds the axial end of a rotor coil, the relationship between the axial position of the axially outboard end of the retaining ring, and the structure of the axially outboard end of the retaining ring. Hereinafter, embodiments of the present disclosure will be described in detail.

[0010] [Description of Embodiments of the Present Application] Fig. 1 is a partial cross-sectional view showing a schematic configuration of a rotating electric machine according to an embodiment of the present application. In Fig. 1, a rotating electric machine 100 includes a stator 10 and a rotor 20 disposed opposite an inner periphery of the stator 10 within a casing 1. In the following description, the axial inward side of the rotating electric machine 100 will be represented as an axial inward side X1, the axial outward side of the rotating electric machine 100 will be represented as an axial outward side X2, the radial outward side will be represented as Y1, and the radial inward side will be represented as Y2.

[0011] The stator 10 has a stator core 11, a stator coil (not shown) housed in a slot of the stator core 11, and a stator coil end portion 12 consisting of a plurality of stator coil ends 12a (see FIG. 2A described later) protruding from an axial end portion 11A of the stator core 11. The rotor 20 has a rotor coil (not shown) provided on a rotor shaft 21 and a retaining ring 22 that holds the coil end portion (axial end portion of the rotor coil) of the rotor coil. An axial fan 23 is attached to the rotor shaft 21 on the axial outboard side X2 of the retaining ring 22. The rotor shaft 21 is rotatably supported by the casing 1 via a bearing portion 2.

[0012] The stator 10 is attached to a stator frame 3 that constitutes a part of the casing 1, and the stator frame 3 is provided with an end plate 5 facing the axial fan 23, and a ventilation path 7 for cooling air is formed.

[0013] A phase ring 6 connected to the stator coil end 12 a of the stator coil end portion 12 is arranged on the radially outer side Y1 of the stator coil end portion 12 in the circumferential and axial directions of the rotating electric machine 100 .

[0014] 2A and 2B are schematic diagrams showing the connection relationship between the stator coil end portions 12 and the phase rings. Fig. 2A is a side view of the connection relationship between the stator coil end portions 12 and the phase rings 6, viewed from the axially outer side of the rotating electric machine 100. In the figure, the stator coil ends 12a extending from the slots of the stator core 11 are connected to the phase rings 6 arranged circumferentially of the rotating electric machine 100, and are configured to be connected to the stator coil ends 12a from other slots or to the terminals 15 via the phase rings 6. The left part of Fig. 2A illustrates a case where the stator coil ends 12a are connected to each other, and the right part illustrates a case where the stator coil ends 12a are connected to the terminals 15.

[0015] 2B is a schematic diagram showing a cross section viewed from the direction A-A in FIG. 2A. In the figure, phase rings 6 are arranged along the circumferential direction of rotating electric machine 100, and a number equal to the number of parallel conductors (three in this case) are arranged at predetermined intervals in the axial direction, with their lengths and positions set according to the positions of stator coil ends 12a or terminals 15 to be connected. Phase leads 16 are members that absorb any misalignment between the axial positions of the ends of stator coil ends 12a and phase rings 6.

[0016] Next, referring to FIG. 3 , the main flow of cooling air through the stator coil end portion and phase ring of the rotating electric machine will be described. Cooling air CW flowing from the ventilation path 7 is sent out toward the inboard axial direction X1 by the axial fan 23. Cooling air A1 sent out from the axial fan 23 collides with the end of the retaining ring 22 on the outboard axial direction X2 (hereinafter referred to as the outboard axial end 22A of the retaining ring) and branches into cooling air A3 and A4, which flow toward the rotor 10, and cooling air A2, which flows toward the stator coil end portion 12. Cooling air A3 cools the rotor coil held within the retaining ring 22, while cooling air A4 flows into the space between the stator 10 and the rotor 20. Cooling air A2 cools the stator coil end portion 12 and then becomes cooling air A5, which cools the phase ring 6. A portion of cooling air A5 flows toward the outboard axial direction X2, becomes cooling air A8 and A9, and merges with cooling air A1 and A2. A portion of the cooling air A5 flows axially inward X1 and becomes cooling air A6. A portion of the cooling air A6 further flows axially inward X1 and becomes cooling air A7, and then flows into the space between the stator 10 and the stator frame 3. A portion of the cooling air A6 flows radially inward Y2 and becomes cooling air 10, which merges with the cooling air A4.

[0017] The present application aims to control the air paths of cooling air A2 and A5 by changing the relationship between the outer diameter of axial fan 23 and the outer diameter of axially outboard end 22A of the retaining ring, the relationship between the axial position of axially outboard end 22A of the retaining ring, and the structure of axially outboard end 22A of the retaining ring, and to actively flow air to high-temperature locations in stator coil end portion 12 or phase ring 6. Since the interlinked magnetic flux and electrical loss differ depending on the axial position in stator coil end portion 12 or phase ring 6, locations with locally high temperatures occur.

[0018] FIG. 4 illustrates the cooling positions of the stator coil end portion and phase ring of a rotating electric machine. The axial length of the stator coil end portion 12, starting from the axial end portion 11A of the stator core 11 and ending at the tip of the stator coil end portion 12 on the outboard side X2 of the axial direction, is L. The magnetic flux linkage increases at positions 0.1L to 0.5L from the axial end portion 11A (starting point) of the stator core 11, resulting in increased eddy current loss and higher temperatures. The phase ring 6 is composed of several rows of conductors arranged in the axial direction. The conductors located closer to the axial center position C1 have more magnetic flux linkage than the conductors located at both axial ends, resulting in increased eddy current loss and higher temperatures. The axial center position C1 of the phase ring 6 is located 0.6L to 0.9L from the axial end portion 11A (starting point) of the stator core 11. Whether the cooling air is to be guided preferentially to the high temperature portions of the stator coil end portion 12 or the phase ring 6 depends on the design conditions of the rotating electrical machine 100, etc.

[0019] 5 and 6 are partial cross-sectional views illustrating a manufacturing method of a rotating electric machine according to a first embodiment of the present invention. First, as shown in FIG. 5 , when cooling the inboard axial side X1 of at least one of the stator coil end portions 12 and the phase ring 6, the relative ratio of the outer diameter D1 of the axial fan 23 to the outer diameter D2 of the axial outboard end 22A of the retaining ring is increased. As a result, as shown in FIG. 5 , cooling air A1 sent out from the axial fan 23 collides with the axial outboard end 22A of the retaining ring and becomes cooling air A2 flowing toward the stator coil end portions 12. The cooling air A2 cools the stator coil end portions 12 and then becomes cooling air A5, which cools the phase ring 6. In this case, because the relative ratio of the outer diameter D1 of the axial fan 23 to the outer diameter D2 of the axial outboard end 22A of the retaining ring is increased, the cooling air A2 cools the inboard axial side X1 of the stator coil end portions 12, and the cooling air A5 cools the inboard axial side X1 of the phase ring 6.

[0020] Next, as shown in Figure 6, when cooling the axially outboard side X2 of at least one of the stator coil end portion 12 and the phase ring 6, the relative ratio of the outer diameter D1 of the axial fan 23 to the outer diameter D2 of the axially outboard end 22A of the retaining ring is reduced. As a result, as shown in Figure 6, cooling air A1 sent out from the axial fan 23 collides with the axially outboard end 22A of the retaining ring and becomes cooling air A2 that flows toward the stator coil end portion 12. The cooling air A2 cools the stator coil end portion 12 and further becomes cooling air A5, which cools the phase ring 6. In this case, because the relative ratio of the outer diameter D1 of the axial fan 23 to the outer diameter D2 of the axially outboard end 22A of the retaining ring is reduced, the cooling air A2 cools the axially outboard side X2 of the stator coil end portion 12, and the cooling air A5 cools the axially outboard side X2 of the phase ring 6.

[0021] As described above, according to this embodiment, when cooling the axially inboard side of at least one of the stator coil end portions 12 and the phase ring 6, the relative ratio of the outer diameter of the axial fan 23 to the outer diameter of the axially outboard end 22A of the retaining ring is increased, and when cooling the axially outboard side of at least one of the stator coil end portions 12 and the phase ring 6, the relative ratio of the outer diameter of the axial fan 23 to the outer diameter of the axially outboard end 22A of the retaining ring is decreased. Therefore, the cooling air can be adjusted and guided to a desired position of at least one of the stator coil end portions 12 and the phase ring 6.

[0022] More specifically, as shown in Fig. 5, when the axially inboard side X1 of at least one of the stator coil end portions 12 and the phase ring 6 is cooled, the ratio of the outer diameter D1 of the axial fan 23 to the outer diameter D2 of the axially outboard end 22A of the retaining ring is set to 1.0 or more, and when the axially outboard side X2 of at least one of the stator coil end portions 12 and the phase ring 6 is cooled as shown in Fig. 6, the ratio of the outer diameter of the axial fan 23 to the outer diameter D2 of the axially outboard end 22A of the retaining ring is set to less than 0.9. By setting the ratio of the outer diameter D1 of the axial fan 23 to the outer diameter D1 of the axially outboard end 22A of the retaining ring to be 1.0 or more, the flow paths of the cooling airflow A2 and A5 after impinging on the axially outboard end 22A of the retaining ring can be adjusted and guided from the axial center position C1 of the phase ring 6 to the axially inboard side X1. Furthermore, by making the ratio of the outer diameter D2 of the axial fan 23 to the outer diameter D1 of the axially outboard end 22A of the retaining ring less than 0.9, the flow paths of the cooling air A2 and A5 after colliding with the axially outboard end 22A of the retaining ring can be adjusted and guided from the axial center position C1 of the phase ring 6 to the axially outboard X2.

[0023] 7A and 7B are diagrams obtained by numerically analyzing the flow of cooling air around the stator coil end portion 12 and the phase ring 6 when the outer diameter of the axial fan is relatively small and large. As shown in FIG. 7A , by reducing the ratio of the outer diameter of the axial fan, the flow paths of the cooling air A2 and the cooling air A5 are shifted to the axially outboard side X2. This effectively reduces the temperature by increasing the flow of cooling air at positions on the stator coil end portion 12 and the phase ring 6 where electrical loss is large and temperature tends to rise. This is expected to contribute to improving the power density of the rotating electric machine. On the other hand, as shown in FIG. 7B , by increasing the ratio of the outer diameter of the axial fan, the flow paths of the cooling air A2 and the cooling air A5 are shifted to the axially inboard side X1. This effectively reduces the temperature by increasing the flow of cooling air at positions on the stator coil end portion 12 and the phase ring 6 where electrical loss is large and temperature tends to rise. This is expected to contribute to improving the power density of the rotating electric machine.

[0024] 8 is a partial cross-sectional view illustrating a manufacturing method of a rotating electric machine according to a second embodiment of the present invention. In the manufacturing method of a rotating electric machine according to the second embodiment of the present invention, when cooling the axially inboard side X1 of at least one of the stator coil end portions 12 and the phase ring 6, the axially outboard end 22A of the retaining ring is positioned on the axially inboard side X1 with respect to the axial position of the axial fan 23, as shown by the solid line in Fig. 8 , and when cooling the axially outboard side X2 of at least one of the stator coil end portions 12 and the phase ring 6, the axially outboard end 22A of the retaining ring is positioned on the axially outboard side X2 with respect to the axial position of the axial fan 23, as shown by the dotted line in Fig. 8 .

[0025] That is, when the axially inboard side X1 of at least one of the stator coil end portions 12 and the phase ring 6 is cooled, the position of the axially outboard end 22A of the retaining ring relative to the axial position of the axial fan 23 is set to the axially inboard side X1 while the relationship between the outer diameters of the axial fan 23 and the axially outboard end 22A of the retaining ring is fixed, thereby making it possible to adjust and guide the flow paths of the cooling airs A2 and A5 after impinging on the axially outboard end 22A of the retaining ring to the axially inboard side X1. On the other hand, when the axially outboard side X2 of at least one of the stator coil end portions 12 and the phase ring 6 is cooled, the axially outboard side X2 of the cooling airs A2 and A5 after impinging on the axially outboard end 22A of the retaining ring can be adjusted and guided to the axially outboard side X2 while the relationship between the outer diameters of the axial fan 23 and the axially outboard end 22A of the retaining ring is fixed.

[0026] 9 is a partial cross-sectional view illustrating a manufacturing method of a rotating electric machine according to a third embodiment of the present invention. In the manufacturing method of a rotating electric machine according to the third embodiment of the present invention, when the axially inboard side X1 of at least one of the stator coil end portions 12 and the phase ring 6 is cooled, a corner 22B of the axially outboard end 22A of the retaining ring is chamfered. That is, when the axially inboard side X1 of at least one of the stator coil end portions 12 and the phase ring 6 is cooled, the corner 22B of the axially outboard end 22A of the retaining ring is chamfered while keeping the relationship between the outer diameters of the axial fan 23 and the axially outboard end 22A of the retaining ring fixed, thereby making it possible to adjust and guide the flow paths of the cooling airflow A2 and A5 after impinging on the axially outboard end 22A of the retaining ring toward the axially inboard side X1.

[0027] Fourth Embodiment A manufacturing method of a rotating electric machine according to a fourth embodiment of the present invention measures the temperature distribution in the axial direction of at least one of the stator coil end portions 12 and the phase ring 6 in advance by actual measurement or simulation, and adjusts at least the ratio of the outer diameter of the axial fan 23 to the outer diameter of the axial outboard end 22A of the retaining ring based on the temperature distribution in the axial direction. Also, the position of the axial outboard end 22A of the retaining ring may be adjusted relative to the axial position of the axial fan 23. Furthermore, when cooling the inboard side X1 in the axial direction, corners 22B of the axial outboard end 22A of the retaining ring may be chamfered.

[0028] Effects of the embodiments of the present application As described above, a method for manufacturing a rotating electric machine according to an embodiment of the present application is a method for manufacturing a rotating electric machine including: a stator having a stator core, a stator coil provided in the stator core, and stator coil end portions protruding from axial ends of the stator core; a rotor having a rotor coil provided on a rotor shaft opposite an inner circumferential portion of the stator core and a retaining ring that holds the axial ends of the rotor coil; an axial fan provided on the rotor shaft on the axial outboard side of the retaining ring; and a phase ring provided radially outboard of the stator coil end portions and connected to the stator coil end portions, wherein when cooling the axially inboard sides of at least one of the stator coil end portions and the phase ring, the relative ratio of the outer diameter of the axial fan to the outer diameter of the axially outboard end of the retaining ring is increased, and when cooling the axially outboard sides of at least one of the stator coil end portions and the phase ring, the relative ratio of the outer diameter of the axial fan to the outer diameter of the axially outboard end of the retaining ring is decreased. It is possible to control the flow path of the cooling air flowing to the stator coil end portion or phase ring of the rotating electrical machine, and to increase the amount of cooling air flowing to the portion where electrical loss is large.

[0029] Furthermore, when cooling the axially inboard side of at least one of the stator coil end portions and the phase ring, the ratio of the outer diameter of the axial fan to the outer diameter of the axially outboard end of the retaining ring is set to 1.0 or more, and when cooling the axially outboard side of at least one of the stator coil end portions and the phase ring, the ratio of the outer diameter of the axial fan to the outer diameter of the axially outboard end of the retaining ring is set to less than 0.9.This makes it possible to more accurately control the flow path of the cooling air flowing to the stator coil end portions or phase ring of the rotating electric machine, and to increase the amount of cooling air to areas where electrical loss is high.

[0030] Furthermore, when the axially inboard side of at least one of the stator coil end portions and the phase ring is cooled, the axially outboard end of the retaining ring is positioned on the axially inboard side relative to the axial position of the axial fan, and when the axially outboard side of at least one of the stator coil end portions and the phase ring is cooled, the axially outboard end of the retaining ring is positioned on the axially outboard side relative to the axial position of the axial fan.This makes it possible to more effectively control the flow path of the cooling air flowing to the stator coil end portions or phase ring of the rotating electric machine, and to increase the amount of cooling air flowing to areas where electrical loss is high.

[0031] Furthermore, when cooling the axially inboard side of at least one of the stator coil end portion and the phase ring, the corners of the axially outboard end portion of the retaining ring are chamfered, which makes it possible to more effectively control the flow path of the cooling air flowing to the stator coil end portion or phase ring of the rotating electric machine, and to increase the amount of cooling air flowing to areas where electrical loss is large.

[0032] Furthermore, the temperature distribution in the axial direction of at least one of the stator coil end portion and the phase ring is measured in advance, and the ratio of the outer diameter of the axial fan to the outer diameter of at least the axially outboard end of the retaining ring is adjusted based on the temperature distribution in the axial direction. This makes it possible to more accurately control the flow path of the cooling air flowing to the stator coil end portion or phase ring of the rotating electric machine, and to increase the amount of cooling air flowing to areas where electrical loss is large.

[0033] Although various exemplary embodiments and examples are described in this application, the various features, aspects, and functions described in one or more embodiments are not limited to the application of a particular embodiment, but may be applied to the embodiments alone or in various combinations. Therefore, countless modifications not illustrated are contemplated within the scope of the technology disclosed in this application. For example, this includes cases where at least one component is modified, added, or omitted, or where at least one component is extracted and combined with components of another embodiment.

[0034] 1 casing, 6 phase ring, 10 stator, 11 stator core, 12 stator coil end portion, 20 rotor, 21 rotor shaft, 22 retaining ring, 22A axial outboard end of retaining ring, 23 axial fan, 100 rotating electric machine.

Claims

1. A stator having a stator core, a stator coil provided on the stator core, and a stator coil end portion protruding from an axial end portion of the stator core, A rotor having a rotor coil disposed to face an inner peripheral portion of the stator core and provided on a rotor shaft, and a holding ring that holds an axial end portion of the rotor coil, An axial flow fan provided on the rotor shaft outside the machine in the axial direction of the holding ring, A method for manufacturing a rotating electrical machine including a phase ring provided outside the stator coil end portion in the radial direction and connected to the stator coil end portion, When cooling at least one of the stator coil end portion and the phase ring on the inner side of the machine in the axial direction, increasing a relative ratio of an outer diameter of the axial flow fan to an outer diameter of an outer end portion of the holding ring on the outer side of the machine in the axial direction, A method for manufacturing a rotating electrical machine, when cooling at least one of the stator coil end portion and the phase ring on the outer side of the machine in the axial direction, reducing a relative ratio of an outer diameter of the axial flow fan to an outer diameter of an outer end portion of the holding ring on the outer side of the machine in the axial direction.

2. When cooling at least one of the stator coil end portion and the phase ring on the inner side of the machine in the axial direction, making a ratio of an outer diameter of the axial flow fan to an outer diameter of an outer end portion of the holding ring on the outer side of the machine in the axial direction 1.0 or more, The method for manufacturing a rotating electrical machine according to claim 1, when cooling at least one of the stator coil end portion and the phase ring on the outer side of the machine in the axial direction, making the ratio of the outer diameter of the axial flow fan to the outer diameter of the outer end portion of the holding ring on the outer side of the machine in the axial direction less than 0.

9.

3. When cooling at least one of the stator coil end portion and the phase ring on the inner side of the machine in the axial direction, providing a position of an outer end portion of the holding ring on the outer side of the machine in the axial direction inside the machine in the axial direction with respect to an axial position of the axial flow fan, The method for manufacturing a rotating electrical machine according to claim 1 or claim 2, when cooling at least one of the stator coil end portion and the phase ring on the outer side of the machine in the axial direction, providing a position of an outer end portion of the holding ring on the outer side of the machine in the axial direction outside the machine in the axial direction with respect to an axial position of the axial flow fan.

4. The method for manufacturing a rotating electrical machine according to claim 1 or claim 2, when cooling at least one of the stator coil end portion and the phase ring on the inner side of the machine in the axial direction, chamfering a corner portion of an outer end portion of the holding ring on the outer side of the machine in the axial direction.

5. The manufacturing method of the rotating electrical machine according to claim 3, wherein when cooling the inner side in the machine axial direction of at least one of the stator coil end portion and the phase ring, chamfering is performed on the corner portion of the outer end portion in the machine axial direction of the holding ring.

6. Measure in advance the temperature distribution in the axial position of at least one of the stator coil end portion and the phase ring, and based on the temperature distribution in the axial position, adjust at least the ratio of the outer diameter of the axial flow fan to the outer diameter of the outer end portion in the machine axial direction of the holding ring. The manufacturing method of the rotating electrical machine according to claim 1 or claim 2.

7. Measure in advance the temperature distribution in the axial position of at least one of the stator coil end portion and the phase ring, and based on the temperature distribution in the axial position, adjust at least the ratio of the outer diameter of the axial flow fan to the outer diameter of the outer end portion in the machine axial direction of the holding ring. The manufacturing method of the rotating electrical machine according to claim 3.

8. Measure in advance the temperature distribution in the axial position of at least one of the stator coil end portion and the phase ring, and based on the temperature distribution in the axial position, adjust at least the ratio of the outer diameter of the axial flow fan to the outer diameter of the outer end portion in the machine axial direction of the holding ring. The manufacturing method of the rotating electrical machine according to claim 4.

9. Measure in advance the temperature distribution in the axial position of at least one of the stator coil end portion and the phase ring, and based on the temperature distribution in the axial position, adjust at least the ratio of the outer diameter of the axial flow fan to the outer diameter of the outer end portion in the machine axial direction of the holding ring. The manufacturing method of the rotating electrical machine according to claim 5.