External fan cover, rotating electric machine, and external fan detection method

Abstract

To prevent contact between an external fan and a person when detecting the external fan optically.SOLUTION: An external fan cover 23 includes a first attachment unit and a peripheral wall 62. The first attachment unit can be attached to a cover attachment unit of a rotary electric machine 10 that has an external fan that can rotate around a rotation center axis. The peripheral wall 62 surrounds the external fan on the outside of the rotation center axis in the radial direction with respect to the external fan, and optical detection of the external fan from the outside in the radial direction of the peripheral wall 62 is possible.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] An embodiment of the present invention relates to an outer fan cover, a rotating electric machine, and an outer fan detection method. [Background technology]

[0002] 2. Description of the Related Art Conventionally, a rotating electric machine is known that includes a rotor having an external fan and an external fan cover that covers the external fan. In this type of rotating electric machine, the rotating electric machine is cooled by the rotation of the external fan.

[0003] In this type of rotating electric machine, the rotor weight balance (rotation balance) is adjusted. In adjusting the rotor weight balance, after removing the outer fan cover, the rotating outer fan is optically detected by an optical sensor, and a balancer device measures the rotor weight balance based on the detection results of the optical sensor. Then, based on the measured weight balance, a weight is attached to the outer fan, and the rotor weight balance is adjusted. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2019-187129 Summary of the Invention [Problem to be solved by the invention]

[0005] In the conventional technology, the external fan is covered by an external fan cover, so the external fan cannot be optically detected when the external fan cover is attached. For this reason, the external fan is optically detected after the external fan cover is removed. In this way, in the conventional technology, the rotating external fan is optically detected when the external fan cover is removed, so there is a risk that a worker or other person may come into contact with the rotating external fan.

[0006] One example of a problem to be solved by the present invention is to prevent contact between an external fan and a person when the external fan is optically detected. [Means for solving the problem]

[0007] The outer fan cover according to one embodiment of the present invention is a cover for an outer fan that can rotate around a central axis of rotation. and a cover mounting portion. A rotating electric machine equipped with The aforementioned Cover mounting part 、 a first mounting portion that can be mounted; and a peripheral wall that surrounds the outer fan on the radially outer side of the rotation central axis with respect to the outer fan, the peripheral wall being capable of optically detecting the outer fan from the radially outer side of the peripheral wall; a second mounting portion; Equipped with The peripheral wall is provided with an opening that allows optical detection of the external fan from the outside in the radial direction of the peripheral wall, and the second mounting portion is capable of mounting a first opening cover that closes the opening and a second opening cover that covers the opening and has a plurality of through holes that communicate with the opening and are smaller than the opening, and when the second opening cover is mounted to the second mounting portion, the external fan can be optically detected from the outside in the radial direction of the peripheral wall via the through holes and the openings of the second opening cover. . [Effects of the Invention]

[0008] According to the present invention, for example, contact between the external fan and a person can be prevented when the external fan is optically detected. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a cross-sectional view that schematically shows a rotating electric machine according to the first embodiment. [Figure 2] FIG. 2 is a plan view schematically showing an outer fan cover of the rotating electrical machine of the first embodiment. [Figure 3] FIG. 3 is a side view schematically showing the outer fan cover of the first embodiment, showing a state in which the first opening cover is attached. [Figure 4] FIG. 4 is a side view schematically showing the outer fan cover of the first embodiment, showing a state in which the first opening cover is removed. [Figure 5] FIG. 5 is a side view schematically showing the outer fan cover of the first embodiment, showing a state in which the second opening cover is attached. [Figure 6] FIG. 6 is a diagram schematically illustrating a rotating electric machine and a balance detection system according to the first embodiment. [Figure 7] FIG. 7 is a flowchart showing the rotor balancing method according to the first embodiment. [Figure 8]FIG. 8 is a cross-sectional view that schematically shows a rotating electric machine according to the second embodiment, showing a state in which an outer fan cover for normal operation is attached. [Figure 9] FIG. 9 is a cross-sectional view that schematically shows a rotating electric machine according to the second embodiment, showing a state in which an outer fan cover for balance adjustment is attached. [Figure 10] FIG. 10 is a perspective view schematically showing an outer fan cover for balance adjustment according to the second embodiment. [Figure 11] FIG. 11 is a diagram schematically illustrating an external fan cover for balance adjustment according to the second embodiment, showing the external fan cover in an unfolded state. [Figure 12] FIG. 12 is a diagram schematically illustrating an external fan cover for balance adjustment according to a modified example of the second embodiment, in a state where the external fan cover is unfolded. DETAILED DESCRIPTION OF THE INVENTION

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

[0011] The drawings are schematic, and the dimensional relationships and ratios of elements may differ from reality. Furthermore, the drawings may include portions in which the dimensional relationships and ratios differ from one another.

[0012] First Embodiment 1 is a cross-sectional view schematically illustrating a rotating electric machine 10 according to a first embodiment. The rotating electric machine 10 is a so-called vertical, totally enclosed, fan-cooled rotating electric machine, and is used, for example, as an electric motor or a generator. However, the rotating electric machine 10 is not limited to this example.

[0013] The rotating electric machine 10 has a stator 11, a rotor 12, a housing 13, a plurality of (for example, two) bearings 15, an inner fan 21, an outer fan 22, and an outer fan cover 23. In this embodiment, the outer fan cover 23 and the housing 13 form a housing 26. However, the rotating electric machine 10 is not limited to this example.

[0014] The stator 11 has a stator core 31 and a stator winding 32. The stator core 31 is formed in a substantially cylindrical shape surrounding the central axis of rotation Ax. The stator winding 32 is attached to the stator core 31 by passing through slots provided in the stator core 31.

[0015] The rotation center axis Ax is the center of rotation of the shaft 14 of the rotor 12 in the rotating electric machine 10, and is, for example, an imaginary line passing through the center of the shaft 14. In this embodiment, the rotation center axis Ax is along the vertical direction. That is, the shaft 14 is along the vertical direction. The axial, radial, and circumferential directions of the rotation center axis Ax are the same as the axial, radial, and circumferential directions of the rotor 12 (shaft 14). In the following description, unless otherwise specified, the axial, radial, and circumferential directions refer to the axial, radial, and circumferential directions of the rotation center axis Ax, i.e., the axial, radial, and circumferential directions of the shaft 14.

[0016] The axial directions include a first axial direction Da1 and a second axial direction Da2. The first axial direction Da1 is a direction along the central axis of rotation Ax. The second axial direction Da2 is the opposite direction to the first axial direction Da1.

[0017] The rotor 12 has a shaft 14, a rotor core 41, and a conductor 42. The shaft 14 is supported by the housing 13 via bearings 15 so as to be rotatable about a rotation axis Ax. This allows the shaft 14 (rotor 12) to rotate about the rotation axis Ax relative to the stator 11. In this embodiment, the shaft 14 and the rotation axis Ax are aligned in the vertical direction.

[0018] The shaft 14 is formed in a generally cylindrical shape extending along the central axis of rotation Ax. The shaft 14 extends from the inside to the outside of the housing 13. The shaft 14 has a middle portion 14a and two outer extending portions 14b, 14c.

[0019] The middle portion 14a is a part of the shaft 14 located inside the housing 13. The middle portion 14a is located between the two extending portions 14b and 14c. Both ends of the middle portion 14a in the axial direction are supported by bearings 15. As a result, the shaft 14 is supported by the bearings 15 so as to be rotatable around the central axis of rotation Ax.

[0020] The extension portions 14b and 14c are parts of the shaft 14 located outside the housing 13. The extension portion 14b protrudes from the end of the middle portion 14a in the first axial direction Da1, beyond the bearing bracket 52, to the outside of the housing 13. The extension portion 14c protrudes from the end of the middle portion 14a in the second axial direction Da2, beyond the bearing bracket 53, to the outside of the housing 13.

[0021] The extension portion 14b is provided with, for example, a flange, a key groove, or a spline, and is coupled to an external device so as to be able to transmit rotation, whereby the rotating electric machine 10 outputs torque to the external device or receives torque from the external device.

[0022] A middle portion 14a of the shaft 14 is coupled to the rotor core 41. The rotor 12 and the shaft 14 can rotate integrally with the stator 11 around a central axis of rotation Ax.

[0023] The rotor core 41 is coupled (fixed) to the middle portion 14a of the shaft 14. The rotor core 41 is formed in a substantially cylindrical shape surrounding the central axis of rotation Ax, and is disposed inside the stator core 31 of the stator 11. The conductors 42 are disposed circumferentially at intervals from one another. The conductors 42 include, for example, conductor bars that axially penetrate the rotor core 41, and short-circuit rings that are coupled to the axial ends of all of the conductor bars. The rotor core 41 and the conductors 42 rotate integrally with the shaft 14.

[0024] The housing 13 has a frame 51, two bearing brackets 52 and 53, and a plurality of heat dissipation fins 54. The frame 51 is formed in a substantially cylindrical shape surrounding the central axis of rotation Ax. The stator 11 and the rotor 12 are disposed inside the frame 51. The stator core 31 is fixed to the frame 51.

[0025] The frame 51 has an inner surface 51a, an outer surface 51b, and multiple bosses 51c. The inner surface 51a faces the inside of the housing 13. The outer surface 51b is located on the opposite side of the inner surface 51a and faces the outside of the housing 13. The bosses 51c protrude from the outer surface 51b to the outside of the housing 13 near an end of the frame 51 in the second axial direction Da2. The multiple bosses 51c are spaced apart in the circumferential direction. The bosses 51c are formed in a cylindrical shape, and a female thread is formed on the inner circumferential surface of the boss. The multiple bosses 51c form a cover mounting portion 55.

[0026] The bearing bracket 52 is attached to an end of the frame 51 in the first axial direction Da1. The bearing bracket 53 is attached to an end of the frame 51 in the second axial direction Da2. The bearing brackets 52, 53 close the internal space of the frame 51. Each of the bearing brackets 52, 53 supports a corresponding bearing 15.

[0027] A closed space Si is provided inside the housing 13. The housing 13 accommodates the stator 11, the rotor core 41, and the central portion 14a of the shaft 14 in the closed space Si. The housing 13 seals the closed space Si substantially airtightly from the outside of the closed space Si. The closed space Si may be expanded to the outside of the frame 51 by a device such as a cooler attached to the housing 13. The closed space Si is filled with a cooling gas such as air.

[0028] The heat dissipation fins 54 protrude, for example, from the outer surface 51b of the frame 51 to the outside of the housing 13. Each of the heat dissipation fins 54 extends substantially in the axial direction. The heat dissipation fins 54 may protrude from the bearing brackets 52, 53, or may extend in another direction.

[0029] The inner fan 21 is coupled (fixed) to the middle part 14a of the shaft 14 in the closed space Si of the housing 13. The inner fan 21 can rotate integrally with the shaft 14 around the central axis of rotation Ax. When the inner fan 21 rotates, it generates an airflow of cooling gas in the closed space Si. The airflow passes, for example, between the stator 11 and the rotor 12 in a substantially axial direction, and cools the stator 11 and the rotor core 41. The inner fan 21 is, for example, included in the rotor 12.

[0030] The housing 13 may be provided with various structures for circulating the cooling gas in the closed space Si. For example, the housing 13 may be adjacent to the inner fan 21 and may have a duct that introduces the cooling gas into the rotating inner fan 21. The housing 13 may also be provided with a flow path that returns the cooling gas that has passed through the stator 11 and the rotor 12 to the vicinity of the inner fan 21.

[0031] The outer fan 22 is coupled (fixed) to the outer extension 14c of the shaft 14 outside the housing 13. This allows the outer fan 22 to rotate integrally with the shaft 14 and the inner fan 21 around the central axis of rotation Ax. The outer fan 22 is, for example, a centrifugal fan that generates airflow in a substantially radial direction. Specifically, the outer fan 22 has a base 22a and a plurality of blades 22b. The base 22a is coupled (fixed) to the outer extension 14c of the shaft 14. The plurality of blades 22b are fixed to the base 22a. The plurality of blades 22b are provided radially outward from the shaft 14 at intervals in the circumferential direction. The outer fan 22 is, for example, included in the rotor 12.

[0032] The outer fan cover 23 is located outside the housing 13 and covers the outer fan 22. The outer fan cover 23 is made of, for example, metal.

[0033] Fig. 2 is a plan view that schematically shows the outer fan cover 23 of the rotating electric machine 10 of the first embodiment. Fig. 3 is a side view that schematically shows the outer fan cover 23 of the first embodiment, and is a diagram showing a state in which a first opening cover 82A is attached. Fig. 3 is a view seen from the arrow III in Fig. 2. Fig. 4 is a side view that schematically shows the outer fan cover 23 of the first embodiment, and is a diagram showing a state in which the first opening cover 82A is removed. Fig. 5 is a side view that schematically shows the outer fan cover 23 of the first embodiment, and is a diagram showing a state in which a second opening cover 82B is attached.

[0034] As shown in FIGS. 1 to 5, the external fan cover 23 includes a cover main body 81, a first opening cover 82A (FIGS. 2 to 4), and a second opening cover 82B (FIG. 5). The first opening cover 82A and the second opening cover 82B can be selectively attached to the cover main body 81. In other words, the first opening cover 82A and the second opening cover 82B can be detachably attached to the cover main body 81. In this way, the external fan cover 23 is formed by combining a plurality of members.

[0035] 1 and 2, the cover body 81 has an end wall 61 and a peripheral wall 62. However, the outer fan cover 23 is not limited to this example.

[0036] The end wall 61 is disposed at a position spaced apart from the housing 13, the shaft 14, and the outer fan 22 in the second axial direction Da2. The end wall 61 is formed, for example, in a substantially disk shape that is substantially perpendicular to the central rotation axis Ax. The outer diameter of the end wall 61 is longer than the outer diameter of the end of the frame 51 in the second axial direction Da2 and is also longer than the outer diameter of the bearing bracket 53. Note that the shape of the end wall 61 is not limited to this example.

[0037] The end wall 61 has an inner surface 61a and an outer surface 61b. The inner surface 61a faces the first axial direction Da1. The inner surface 61a faces the housing 13, the shaft 14, and the outer fan 22 via a gap. The outer surface 61b is located on the opposite side of the inner surface 61a and faces the second axial direction Da2.

[0038] As shown in FIGS. 1 to 3, the peripheral wall 62 is formed in a substantially cylindrical shape extending from the outer edge of the end wall 61 approximately in the first axial direction Da1. The peripheral wall 62 is cylindrical about the central axis of rotation Ax. More specifically, as shown in FIGS. 2 and 3, the peripheral wall 62 has a first cylindrical portion 62a and a second cylindrical portion 62b. The first cylindrical portion 62a is located radially outside the outer fan 22 and surrounds the outer fan 22. The inner diameter of the first cylindrical portion 62a is longer than the outer diameter of the end of the frame 51 in the second axial direction Da2 and is longer than the outer diameter of the bearing bracket 53. The second cylindrical portion 62b connects the first cylindrical portion 62a and the end wall 61.

[0039] The first cylindrical portion 62a surrounds the bearing bracket 53 and the end of the frame 51 in the second axial direction Da2. The peripheral wall 62 is spaced radially from the outer surface 51b of the frame 51 and the bearing bracket 53. This forms a gap G between the peripheral wall 62 and the housing 13.

[0040] The peripheral wall 62 has a first mounting portion 62c that is attached to the cover mounting portion 55 of the frame 51. The first mounting portion 62c is provided at the end of the first cylindrical portion 62a on the first axial direction Da1 side. The first mounting portion 62c is cylindrical about the rotation center axis Ax, and is positioned radially outward of the cover mounting portion 55 and overlaps the cover mounting portion 55. Here, the cover mounting portion 55 is, for example, a portion of the frame 51 that overlaps with the first mounting portion 62c. The first mounting portion 62c is provided with a plurality of through holes 67 into which bolts 65 are inserted. The first mounting portion 62c is fixed to the boss 51c of the cover mounting portion 55 of the frame 51 by, for example, the bolts 65 inserted into the through holes 67.

[0041] As shown in FIG. 4, an opening 63b is provided in the first cylindrical portion 62a of the peripheral wall 62. The opening 63b penetrates the first cylindrical portion 62a in the radial direction. The opening 63b is, for example, rectangular. Note that the opening 63b may be circular or other shapes. The opening 63b is aligned with the inner fan 21 (base 22a, blades 22b) in the radial direction and exposes the inner fan 21 to the outside of the outer fan cover 23. Light can pass through the opening 63b. Optical detection and visual inspection of the outer fan 22 from the outside in the radial direction of the peripheral wall 62 are possible through this opening 63b. Note that while FIG. 4 shows an example in which there is one opening 63b, there may be multiple openings 63b. The opening 63b is also referred to as a light passing portion, a detection opening, an inspection opening, a working opening, etc.

[0042] The first cylindrical portion 62a of the peripheral wall 62 has a second mounting portion 62d. The second mounting portion 62d can selectively mount a first opening cover 82A (FIG. 3) or a second opening cover 82B (FIG. 5). The first opening cover 82A (FIG. 3) is a cover for normal operation and is mounted to the second mounting portion 62d during normal operation of the rotating electric machine 10. On the other hand, the second opening cover 82B (FIG. 5) is a cover for balance adjustment and is mounted to the second mounting portion 62d during balance adjustment of the rotor 12. The second mounting portion 62d is a portion of the first cylindrical portion 62a surrounding the opening 63b and overlaps with the first opening cover 82A or the second opening cover 82B. A plurality of female threads 84 are provided on the second mounting portion 62d. The second mounting portions 62d, the first opening covers 82A, and the second opening covers 82B are provided corresponding to the openings 63b, respectively. That is, the number of the second mounting portions 62d, the first opening covers 82A, and the second opening covers 82B is the same as the number of the openings 63b.

[0043] 3 and 4, the first opening cover 82A closes the opening 63b when attached to the second attachment portion 62d. When the first opening cover 82A closes the opening 63b, the outer fan 22 cannot be optically detected or visually observed from the radially outer side of the opening 63b.

[0044] The first opening cover 82A is made of, for example, metal. The first opening cover 82A is formed in a curved shape that fits along the outer surface of the first cylindrical portion 62a. A plurality of through holes 85 are formed in the first opening cover 82A. The first opening cover 82A is fixed to the second mounting portion 62d by bolts 83 (FIG. 3) inserted into the through holes 85. The bolts 83 are coupled with female threads 84. By removing the bolts 83, the first opening cover 82A can be removed from the second mounting portion 62d.

[0045] As shown in FIG. 5, the second opening cover 82B has a plurality of through holes 63a. When the second opening cover 82B is attached to the second mounting portion 62d, it covers the opening 63b. In this state, the plurality of through holes 63a are located radially outward of the opening 63b and communicate with the opening 63b. The plurality of through holes 63a are aligned radially with the inner fan 21 (base 22a, blades 22b) and the opening 63b, exposing the inner fan 21 to the outside of the outer fan cover 23. Light can pass through the through holes 63a. The outer fan 22 can be optically detected and visually observed from the radially outside of the peripheral wall 62 via the through holes 63a and the opening 63b. The plurality of through holes 63a and the opening 63b form the opening 63. The through holes are also referred to as light passing portions, etc.

[0046] The second opening cover 82B is made of, for example, metal. The second opening cover 82B is formed in a curved shape that fits along the outer surface of the first cylindrical portion 62a. The second opening cover 82B has a plurality of through holes formed therein that are similar to the plurality of through holes 85 of the first opening cover 82A. The second opening cover 82B is fixed to the second mounting portion 62d by bolts 83 inserted into the through holes. The bolts 83 are coupled with female threads 84. By removing the bolts 83, the second opening cover 82B can be removed from the second mounting portion 62d.

[0047] The end wall 61 and peripheral wall 62 configured as described above cover the bearing bracket 53 of the housing 13, the outwardly extending portion 14c of the shaft 14, and the outer fan 22. The outer fan cover 23 forms (defines, partitions) a flow path space Sc surrounded by the bearing bracket 53, the end wall 61, and the peripheral wall 62. The outwardly extending portion 14c of the shaft 14 and the outer fan 22 are disposed in the flow path space Sc. The inner surface 61a of the end wall 61 faces the inside of the flow path space Sc.

[0048] A hole 70 is provided in the center of the end wall 61. The hole 70 passes through the end wall 61 in the axial direction and opens to the inner surface 61a and the outer surface 61b of the end wall 61. The shaft 14 is inserted into the hole 70.

[0049] An air intake 71 is provided in the outer fan cover 23. The air intake 71 is composed of a plurality of holes 71a. In this embodiment, the air intake 71 is provided in the end wall 61. The air intake 71 axially penetrates the end wall 61 and opens to the inner surface 61a and the outer surface 61b of the end wall 61. As a result, the air intake 71 communicates between the flow path space Sc and the outside of the flow path space Sc. The air intake 71 may also be provided in the peripheral wall 62.

[0050] 2, each of the plurality of holes 71a of the intake port 71 is formed around the hole 70. Each hole 71a is formed in an elongated hole shape. However, the shape of the holes 71a may be other shapes.

[0051] 1, the end of the flow path space Sc in the second axial direction Da2 communicates with the outside through the intake port 71. Moreover, the end of the flow path space Sc in the first axial direction Da1 communicates with the outside through the gap G.

[0052] By rotating, the external fan 22 can draw outside air into the flow path space Sc through the air intake port 71. The airflow of the outside air generated by the rotating external fan 22 is discharged to the outside of the flow path space Sc through the gap G, for example, and flows along the outer surface 51b of the frame 51.

[0053] The outside air flows along the heat dissipation fins 54, thereby exchanging heat with the frame 51. As a result, the outside air flows through the frame 51 to cool the stator 11 coupled to the frame 51 and the cooling gas in the closed space Si.

[0054] Next, a method for adjusting the balance of the rotor 12 will be described. Fig. 6 is a diagram that schematically shows the rotating electric machine 10 and balance detection system 200 of the first embodiment. Fig. 7 is a flowchart that shows the method for adjusting the balance of the rotor 12 of the first embodiment.

[0055] As shown in FIG. 6, the balance adjustment of the rotor 12 is performed using a balance detection system 200.

[0056] The balance detection system 200 includes an optical sensor 201 , a vibration sensor 202 , and a balancer device 203 .

[0057] The optical sensor 201 can optically detect the external fan 22. The optical sensor 201 includes, for example, a photosensor and an image sensor. The photosensor is, for example, a reflective type and has a light-emitting unit that emits light and a light-receiving unit that receives reflected waves. The photosensor is disposed radially outside the opening 63 (through-hole 63a, opening 63b) of the external fan cover 23, and emits light from the light-emitting unit to the external fan 22. The light passes through the opening 63 and is reflected by the blades 22b of the external fan 22. The photosensor detects the blades 22b of the external fan 22 by receiving the light reflected by the blades 22b. The photosensor can also detect rotation pulses of the external fan 22. The image sensor is, for example, configured as an area camera such as a CMOS image sensor. The image sensor is disposed radially outside the opening 63 (through-hole 63a, opening 63b) of the outer fan cover 23, and detects the blades 22b by capturing an image of the blades 22b of the outer fan 22 through the opening 63. The optical sensor 201 transmits the detection result to the balancer device 203.

[0058] The vibration sensor 202 is fixed to the outer surface of the frame 51 by, for example, a magnet or the like, and detects vibrations (vibration values) of the frame 51 (the rotating electrical machine 10). The vibration values ​​include amplitude values.

[0059] Next, the steps of the balance adjustment method will be described with reference to the flowchart in Fig. 7. The balance adjustment is performed during inspection before shipping of the rotating electric machine 10 or during regular inspection after shipping. The example in Fig. 7 is an example in which the balance adjustment method is started with the first opening cover 82A attached to the second attachment portion 62d.

[0060] 7, first, a first preparation step is performed (S101). Specifically, an operator attaches the vibration sensor 202 to the frame 51.

[0061] Next, a vibration measurement step is performed (S102). Specifically, an operator starts the operation of the rotating electric machine 10. This causes the rotor 12 to rotate. While the rotor 12 is rotating, the vibration sensor 202 detects the vibration (vibration value) of the frame 51 (rotating electric machine 10), and the balancer device 203 displays the detection result of the vibration sensor 202 on a display device.

[0062] Next, the balancer device 203 determines whether the vibration, i.e., the vibration value, detected by the vibration sensor 202 is within a standard (S103). The standard is a predetermined threshold. If the vibration value is equal to or less than the threshold, the balancer device 203 determines that the vibration value is within the standard (S103: Yes). If it is determined that the vibration value is within the standard (S103: Yes), the balance adjustment method ends. If the vibration value exceeds the threshold, the balancer device 203 determines that the vibration value is not within the standard (S103: No). If it is determined that the vibration value is not within the standard (S103: No), the second preparation step of S104 is performed. Note that the determination of whether the vibration value detected by the vibration sensor 202 is within the standard may be made by an operator.

[0063] In the second preparation step S104, with the rotating electric machine 10 stopped, the worker removes the first opening cover 82A attached to the second mounting portion 62d from the second mounting portion 62d and attaches the second opening cover 82B to the second mounting portion 62d. The second preparation step S104 is an example of a cover replacement step. The worker also positions the rotating electric machine 10 and the optical sensor 201 so that the optical sensor 201 can detect the outer fan 22 from the radial outside of the opening 63 (through-hole 63a, opening 63b) of the outer fan cover 23. The worker also writes a number on each blade 22b.

[0064] Next, a vibration measurement and external fan detection step is performed (S105). Specifically, the optical sensor 201 detects the external fan 22 from the radial outside of the peripheral wall 62 through the through-hole 63a and opening 63b of the second opening cover 82B attached to the second attachment portion 62d. More specifically, the photosensor detects the rotation pulse of the blade 22b, and the image sensor detects the blade 22b and the number of the blade 22b by imaging. The vibration measurement and external fan detection step S105 is an example of a detection step.

[0065] Next, a balance detection step is performed (S106). Specifically, the balancer device 203 calculates a vibration phase based on the detection results of the optical sensor 201 and the vibration sensor 202, and calculates the position of the weight imbalance in the rotor 12 and the amount of the weight imbalance based on the calculated vibration phase.

[0066] Next, a balance adjustment step is performed (S107). Specifically, an operator attaches a balancing weight to the blade 22b at a position 180° shifted from the blade 22b at the unbalanced position. This changes the unbalanced position and reduces the amount of unbalanced (weight).

[0067] Next, a vibration measurement step is performed (S108). Specifically, the worker performs an operation to resume operation of the rotating electric machine 10. This causes the rotor 12 to rotate. While the rotor 12 is rotating, the vibration sensor 202 detects the vibration (vibration value) of the frame 51 (rotating electric machine 10), and the balancer device 203 displays the detection result of the vibration sensor 202 on the display device.

[0068] Next, the balancer device 203 determines whether the vibration detected by the vibration sensor 202, i.e., the vibration value, is within the standard range (S109), as in S103. If it is determined that the vibration value is within the standard range (S109: Yes), the balance adjustment method ends. If it is determined that the vibration value is not within the standard range (S109: No), the steps of S105 to S109 are repeated until the vibration value is within the standard range.

[0069] As described above, the external fan detection method of this embodiment includes a second preparation step S104 (cover replacement step) of removing the first opening cover 82A attached to the second attachment portion 62d from the second attachment portion 62d and attaching the second opening cover 82B to the second attachment portion 62d. The external fan detection method also includes a vibration measurement / external fan detection step S105 (detection step) of detecting the external fan 22 from the radial outside of the peripheral wall 62 by the optical sensor 201 through the through hole 63a and the opening 63b of the second opening cover 82B attached to the second attachment portion 62d.

[0070] By the above-described balance adjustment method, the weight balance (rotation balance) of the rotor 12 is adjusted, and vibration is reduced.

[0071] As described above, the outer fan cover 23 of this embodiment includes the first mounting portion 62c and the peripheral wall 62. The first mounting portion 62c can be mounted to the cover mounting portion 55 of the rotating electric machine 10 that includes the outer fan 22 that is rotatable around the central axis of rotation Ax. The peripheral wall 62 surrounds the outer fan 22 on the radially outer side of the central axis of rotation Ax relative to the outer fan 22, and the outer fan 22 can be detected from the radially outer side of the peripheral wall 62.

[0072] According to this configuration, the external fan 22 can be detected from the radial outside of the peripheral wall 62, and therefore, with the external fan cover 23 attached to the cover attachment portion 55, the external fan 22 can be optically detected from the radial outside of the peripheral wall 62. Therefore, contact between the external fan 22 and a person during optical detection of the external fan 22 can be prevented.

[0073] The peripheral wall 62 is also provided with an opening 63b that allows optical detection of the outer fan 22 from the outside in the radial direction of the peripheral wall 62.

[0074] According to this configuration, with the outer fan cover 23 attached to the cover attachment portion 55, the outer fan 22 can be detected from the outside in the radial direction of the peripheral wall 62 through the opening 63b.

[0075] The outer fan cover 23 also includes a second mounting portion 62d. The second mounting portion 62d can selectively mount either the first opening cover 82A or the second opening cover 82B. The first opening cover 82A covers the opening 63b. The second opening cover 82B has a plurality of through holes 63a that communicate with the opening 63b and are smaller than the opening 63b, and covers the opening 63b. When the second opening cover 82B is mounted to the second mounting portion 62d, the outer fan 22 can be optically detected from the radially outside of the peripheral wall 62 via the through holes 63a and openings 63b of the second opening cover 82B.

[0076] According to this configuration, during normal operation of the rotating electric machine 10, attaching the first opening cover 82A to the second mounting portion 62d can prevent air blown by the external fan 22 from leaking through the opening 63b. This can prevent a decrease in the cooling performance of the rotating electric machine 10 due to the air blown by the external fan 22. On the other hand, during balance adjustment of the rotating electric machine 10, attaching the second opening cover 82B to the second mounting portion 62d can detect the external fan 22 from the radial outside of the peripheral wall 62 through the opening 63b. At this time, because the through-hole 63a is smaller than the opening 63b, it is possible to further prevent contact between the external fan 22 and a person when the external fan 22 is detected.

[0077] <Second embodiment> Fig. 8 is a cross-sectional view schematically showing a rotating electric machine 10A according to a second embodiment, with an outer fan cover 23A for normal operation attached. Fig. 9 is a cross-sectional view schematically showing a rotating electric machine 10A according to a second embodiment, with an outer fan cover 23B for balance adjustment attached.

[0078] 8 and 9, the rotating electric machine 10A of this embodiment differs from the first embodiment in that outer fan covers 23A and 23B are provided instead of the outer fan cover 23 of the rotating electric machine 10. The outer fan covers 23A and 23B are detachably attached to a cover attachment portion 55.

[0079] 8 is for normal operation and is not provided with an opening 63b. The outer fan cover 23A covers the outer fan 22.

[0080] The outer fan cover 23B shown in FIG. 9 is for balance adjustment and does not have an opening 63b.

[0081] Fig. 10 is a perspective view schematically showing an outer fan cover 23B for balance adjustment according to the second embodiment. Fig. 11 is a view schematically showing an outer fan cover 23B for balance adjustment according to the second embodiment, in which the outer fan cover 23B is unfolded.

[0082] As shown in Figures 10 and 11, the outer fan cover 23B has a peripheral wall 62B but does not have an end wall 61. The outer fan cover 23B is composed of a transparent plate-like member 90 rolled into a cylindrical shape, and its diameter is adjustable. The plate-like member 90 is, for example, a transparent acrylic plate. The peripheral wall 62 of such an outer fan cover 23 is light-transmitting. At least a portion (for example, the entirety) of the peripheral wall 62 allows optical detection of the outer fan 22 from outside the peripheral wall 62. Note that only a portion of the peripheral wall 62 may be transparent. The transparent portion of the peripheral wall 62 is also referred to as a light-transmitting portion.

[0083] The peripheral wall 62 is provided with a first mounting portion 62c that can be attached to the cover mounting portion 55. The first mounting portion 62c is provided with a plurality of elongated holes 91. The longitudinal direction of the plurality of elongated holes 91 is aligned with the circumferential direction of the peripheral wall 62. The peripheral wall 62 is also provided with a plurality of elongated holes 92. The longitudinal direction of the plurality of elongated holes 92 is aligned with the circumferential direction of the peripheral wall 62.

[0084] An overlapping portion 93 is formed in the outer fan cover 23, where both end portions of the peripheral wall 62 overlap. In the overlapping portion 93, the two elongated holes 91 overlap, and the two elongated holes 92 overlap.

[0085] The outer fan cover 23 is fixed to the cover mounting portion 55 by the bolts 65 inserted into the elongated holes 91. At this time, the bolts 65 are inserted into the two elongated holes 92 that overlap at the overlapping portion 93.

[0086] With the bolts 65 removed, the diameter (outer diameter and inner diameter) of the outer fan cover 23 can be changed by changing the overlapping amount of the overlapping portion 93.

[0087] Next, a balance adjustment method of this embodiment will be described. In this embodiment, in the second preparation step (S104 in FIG. 7), an operator removes outer fan cover 23A (first outer fan cover) attached to cover attachment portion 55 from cover attachment portion 55, and attaches outer fan cover 2323B (second outer fan cover) to cover attachment portion 55.

[0088] In addition, in the vibration measurement and external fan detection step (S105 in FIG. 7), the optical sensor 201 detects the external fan 22 from the radially outside of the peripheral wall 62 of the external fan cover 23B attached to the cover attachment portion 55.

[0089] According to the above configuration, with the outer fan cover 23B attached to the cover attachment portion 55, the outer fan 22 can be optically detected from the radially outside of the transparent portion of the peripheral wall 62. Therefore, contact between the outer fan 22 and a person when the outer fan 22 is detected can be prevented.

[0090] The peripheral wall 62 is formed of a plate-like member 90 rolled into a cylindrical shape, and the diameter thereof is changeable.

[0091] With this configuration, the diameter of the peripheral wall 62 can be set according to the diameter of an imaginary circle connecting the multiple cover mounting portions 55. Therefore, one outer fan cover 23B can be shared by rotating electric machines 10A of multiple specifications in which the diameters of the imaginary circles connecting the multiple cover mounting portions 55 are different from one another.

[0092] FIG. 12 is a diagram schematically illustrating an outer fan cover 23C (second outer fan cover) for balance adjustment according to a modified example of the second embodiment, and illustrates the outer fan cover 23C in an unfolded state.

[0093] The external fan cover 23C of this modified example differs from the external fan cover 23B in that it is provided with a plurality of openings 94. The openings 94 are light passing portions that allow light to pass through. With this configuration, the external fan 22 can be optically detected through the openings 94. Furthermore, since a plurality of openings 94 are provided, the openings 94 to be used can be selected depending on the size and shape of the external fan 22.

[0094] In the above embodiment, an example has been shown in which the rotating electric machine 10 is provided with the internal fan 21, but this is not limiting. For example, the internal fan 21 may not be provided. Also, the second opening cover 82B may be attached to overlap the first opening cover 82A.

[0095] In the above embodiment, a sliding earth brush may be provided on the shaft 14.

[0096] Although several embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be embodied in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are included within the scope and spirit of the invention, and are also included in the scope of the invention and its equivalents as defined in the claims. [Explanation of symbols]

[0097] 10, 10A... rotating electric machine, 22... external fan, 23, 23A, 23B, 23C... external fan cover, 55... cover mounting portion, 62... peripheral wall, 62c... first mounting portion, 62d... second mounting portion, 63a... through hole, 63b... opening, 82A... cover for first opening, 82B... cover for second opening, 90... plate-shaped member, Ax... rotation center axis, S104... second preparation process (cover replacement process), S105... vibration measurement / external fan detection process (detection process).

Claims

1. a first mounting portion that can be mounted to a cover mounting portion of a rotating electric machine including an outer fan that can rotate around a rotation center axis and a cover mounting portion; A peripheral wall that surrounds the outer fan on the radially outer side of the rotation center axis with respect to the outer fan, and allows optical detection of the outer fan from the radially outer side of the peripheral wall; a second mounting portion; Equipped with The peripheral wall is provided with an opening that allows optical detection of the outer fan from the outside in the radial direction of the peripheral wall, the second mounting portion is capable of mounting a first opening cover that closes the opening, and a second opening cover that covers the opening and has a plurality of through holes that communicate with the opening and are smaller than the opening, When the second opening cover is attached to the second mounting portion, the outer fan can be optically detected from the outside in the radial direction of the peripheral wall through the through hole and the opening of the second opening cover. External fan cover.

2. At least a portion of the peripheral wall is transparent to allow optical detection of the outer fan from outside the peripheral wall. The outer fan cover according to claim 1 .

3. The peripheral wall is formed of a cylindrically rolled plate-like member, and the diameter thereof is changeable. The outer fan cover according to claim 1 .

4. A rotating electric machine comprising the outer fan cover according to any one of claims 1 to 3.

5. An external fan detection method for detecting an external fan of a rotating electric machine including an external fan rotatable around a rotation center axis, a cover attachment portion, and an external fan cover, the method comprising: The outer fan cover includes a first mounting portion that can be mounted to the cover mounting portion, a peripheral wall that surrounds the outer fan radially outward from the rotation center axis relative to the outer fan, the peripheral wall having an opening that allows optical detection of the outer fan from the radially outward side of the peripheral wall, and a second mounting portion, the second mounting portion is capable of mounting a first opening cover that closes the opening and a second opening cover that covers the opening and has a plurality of through holes that communicate with the opening, When the second opening cover is attached to the second mounting portion, the outer fan can be optically detected from the outside in the radial direction of the peripheral wall through the through hole and the opening of the second opening cover, The outer fan detection method includes: a cover replacement step of removing the first opening cover attached to the second attachment portion from the second attachment portion and attaching the second opening cover to the second attachment portion; a detection step of detecting the outer fan from the radially outer side of the peripheral wall through the through hole and the opening of the second opening cover attached to the second attachment portion by an optical sensor; An external fan detection method including:

6. An outer fan detection method for detecting an outer fan of a rotating electric machine including an outer fan rotatable around a rotation center axis, a cover mounting portion, and a first outer fan cover mounted on the cover mounting portion and covering the outer fan, wherein a second outer fan cover can be mounted on the cover mounting portion instead of the first outer fan cover, The second outer fan cover includes a first mounting portion that can be mounted to the cover mounting portion, and a peripheral wall that surrounds the outer fan on the radially outer side of the rotation central axis relative to the outer fan, and that allows optical detection of the outer fan from the radially outer side of the peripheral wall, The outer fan detection method includes: a cover replacement process of removing the first outer fan cover attached to the cover attachment portion from the cover attachment portion and attaching the second outer fan cover to the cover attachment portion; a detection step of detecting the outer fan from the radially outer side of the peripheral wall of the second outer fan cover attached to the cover attachment portion by an optical sensor; An external fan detection method including:

Images