Cleaning method for rotating electrical machine

Abstract

To achieve proper cleaning operations in a cleaning method for a rotary electric machine.SOLUTION: A cleaning method for a rotary electric machine includes the steps of: rotating a rotator, linearly arranging a cooling hole and first and second outdoor air ports, and fixing the rotator so as to prevent the rotation of the rotator by actuating a lock mechanism; and inserting a cleaning brush into the cooling hole from the first outside air port, and axially moving the cleaning brush in the state of pressing it against an inner surface of the cooling hole so as to scrape duct adhering to the inner surface of the cooling hole.SELECTED DRAWING: Figure 8

Description

Technical Field

[0001] Embodiments of the present invention relate to a method for cleaning a rotating electrical machine.

Background Art

[0002] Generally, a railway vehicle has a rotating electrical machine loaded on a bogie disposed below the vehicle body, and the driving rotational force of the rotating electrical machine is transmitted to the wheels through a coupling and a speed reduction device, and the vehicle runs by rotating the wheels. The rotating electrical machine is fixed to the bogie by a mounting portion.

[0003] The rotating electrical machine is configured such that a rotor is rotatably supported inside a stator. The rotating electrical machine needs to take in outside air to cool the rotor, and a plurality of cooling holes are provided in the rotor along the axial direction. However, the outside air contains dust and dirt, and when the rotor is cooled by the outside air, dust adheres to and accumulates in the cooling holes. Therefore, it is necessary to periodically clean the cooling holes of the rotor. As such a method for cleaning a rotating electrical machine, there is one described in Patent Document 1 below.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] Conventional methods for cleaning a rotating electrical machine discharge dust accumulated in the cooling holes of the rotor to the outside by supplying air from the outside to the cooling holes of the rotor. However, when the dust is firmly attached to the inner surface of the cooling holes of the rotor, there is a problem that it is difficult to appropriately remove the attached dust.

[0006] The problem to be solved by the present invention is to provide a rotating electrical machine that aims to optimize the cleaning operation. [Means for solving the problem]

[0007] A method for cleaning a rotating electric machine according to an embodiment includes: a cylindrical stator; a rotor disposed radially inward of the stator and provided with a cooling hole penetrating along the axial direction at a position offset radially outward from the center of rotation by a predetermined length from the center of rotation; a first support member fixed to one axial end of the stator, rotatably supporting the one axial end of the rotor, and provided with a first outside air port penetrating along the axial direction at a position offset radially outward from the center of rotation of the rotor by the predetermined length; and a second support member fixed to the other axial end of the stator, rotatably supporting the other axial end of the rotor, and provided with an axial cooling hole at a position offset radially outward from the center of rotation of the rotor by the predetermined length from the center of rotation of the rotor, a locking mechanism provided on the first support member or the second support member; a first cooling fan fixed to one axial end of the rotor; and a second cooling fan fixed to the other axial end of the rotor, the method comprising the steps of: rotating the rotor to linearly position the cooling hole, the first axial air outlet, and the second axial air outlet, and activating the locking mechanism to fix the rotor so that it does not rotate; and inserting a cleaning brush from the first axial air outlet into the cooling hole, and scraping off dust adhering to the inner surface of the cooling hole by pressing the cleaning brush against the inner surface of the cooling hole and moving it axially. [Brief description of the drawings]

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Figure 14

Figure 15

[0009] [First embodiment] <Configuration of rotating electric machine> 1 is a schematic diagram for explaining a driving force transmission path in a rotating electric machine according to the first embodiment. In the following embodiment, the rotating electric machine will be described as being applied to a driving device for a railway vehicle.

[0010] The railway vehicle drive unit 10 includes a rotating electric machine 11 , a coupling 12 , a reduction gear 13 , an axle 14 , and wheels 15 .

[0011] The rotating electrical machine 11 is a three-phase induction motor. The rotating electrical machine 11 is fixed to the underframe (not shown) of the carriage. The rotating electrical machine 11 has a drive shaft 16 that can be driven to rotate. The drive shaft 16 is connected to a connecting shaft 17 via a coupling 12. The speed reduction device 13 is fixed to the underframe of the carriage. The speed reduction device 13 is a gear mechanism having a plurality of gears. The connecting shaft 17 is connected to the speed reduction device 13. The speed reduction device 13 reduces the input driving rotational force. The axle 14 is rotatably supported by the underframe of the carriage. Wheels 15 are respectively fixed to both axial ends of the axle 14. The intermediate portion in the axial direction of the axle 14 is connected to the speed reduction device 13.

[0012] Therefore, when the rotating electrical machine 11 is driven, the drive shaft 16 rotates drivenly, and the driving rotational force is input to the speed reduction device 13 via the drive shaft 16, the coupling 12, and the connecting shaft 17. The speed reduction device 13 reduces the driving rotational speed of the input rotating electrical machine 11 and rotationally drives the axle 14. Then, the wheels 15 fixed to both ends of the axle 14 rotate, and the railway vehicle can run.

[0013] <Configuration of Rotating Electrical Machine> FIG. 2 is a cross-sectional view of the rotating electrical machine according to the first embodiment, broken at the rotational axis position.

[0014] The rotating electrical machine 11 of the first embodiment has a frameless structure. The rotating electrical machine 11 is a totally enclosed type three-phase induction motor with only external air cooling, without internal circulation of cooling air. By passing a three-phase alternating current through the coils of the stator to create a rotating magnetic field, the magnetic poles of the rotor are pulled by the rotating magnetic field of the stator to rotate the rotor.

[0015] The rotating electric machine 11 includes a rotor 21 and a stator 22. The rotor 21 is a cage rotor fixed to the outer periphery of a rotating shaft 31. The rotor 21 includes a rotor core 32 and multiple rotor bars 33. Multiple rotor bars 33 are axially arranged at intervals around the outer periphery of the cylindrical rotor core 32. The ends of the multiple rotor bars 33 protrude radially outward from the rotor core 32 and are connected by end rings 33a. The stator 22 is cylindrical and is arranged outside the rotor 21. The stator 22 is configured by a cylindrical stator core 34 having multiple grooves formed on the inner periphery thereof, each containing a stator coil 35. The stator coil 35 is provided with interphase insulating paper 35a covering the coil ends. A constant air gap is formed between the outer periphery of the rotor 21 and the inner periphery of the stator 22 in both the circumferential and axial directions. When the rotating electric machine 11 is driven, the rotor 21 rotates due to the attractive and repulsive forces of the magnetic force generated by the current flowing through the stator coil 35, and the rotating shaft 31 outputs a rotational force.

[0016] One axial end of the rotating shaft 31 is rotatably supported by a bracket 42 via a bearing 41, and the other axial end is rotatably supported by a bracket 44 via a bearing 43. The brackets 42, 44 are disk-shaped and have circular holes 42a, 44a formed in the center thereof, penetrating in the axial direction. The bearings 41, 43 are disposed between the rotating shaft 31 and the circular holes 42a, 44a of the brackets 42, 44. The bearings 41, 43 are supported by support portions 45, 46 attached to the brackets 42, 44, preventing them from falling off. The support portions 45, 46 are cylindrical and fit into the circular holes 42a, 44a of the brackets 42, 44 from the outside in the axial direction. One axial end of the rotating shaft 31 is covered by the bracket 42, and the other axial end protrudes to the outside through the circular hole 44a formed in the bracket 44. The rotary shaft 31 has a key groove 31a formed at the end protruding outward from the circular hole 44a of the bracket 44, and the coupling 12 (see FIG. 1) is attached via the key groove 31a.

[0017] The stator core 34 is formed in an annular shape by laminating multiple magnetic plates. A pair of stator pressure plates 47, 48 are arranged on both sides of the stator core 34 in the lamination direction so that they are in close contact with each other. The stator pressure plates 47, 48 are ring-shaped. The stator pressure plates 47, 48 have the same shape and are connected by multiple (four in this embodiment) stator connecting portions 49. The stator connecting portions 49 are arranged on the outer periphery of the stator 22, spaced apart in the circumferential direction of the stator 22. The stator coil 35 is arranged on the inner periphery of the stator core 34.

[0018] A cooling fan 52 is connected to one axial side of the rotor 21 via a rotor retaining plate 51, and a cooling fan 54 is connected to the other axial side via a rotor retaining plate 53. The cooling fans 52 and 54 are disk-shaped and have multiple blades 52a and 54a arranged at predetermined intervals around their outer peripheries. The cooling fans 52 and 54 rotate integrally with the rotating shaft 31 and the rotor 21. A bracket 55 is arranged on one axial side of the stator 22, and a bracket 56 is arranged on the other axial side. The brackets 55 and 56 have circular holes 55a and 56a formed in their centers and penetrating axially. The brackets 55 and 56 have their outer peripheries connected to the outer peripheries of the stator retaining plates 47 and 48, thereby covering both axial sides of the stator 22. The outer peripheries of the cooling fans 52 and 54 contact the inner peripheries of the circular holes 55a and 56a of the brackets 55 and 56. Ring-shaped labyrinth seals 57 and 58 are disposed between the inner peripheries of the circular holes 55a and 56a of the brackets 55 and 56 and the outer peripheries of the cooling fans 52 and 54, respectively.

[0019] Further, for the bracket 55, the inner peripheral portion 55b is connected to the outer peripheral portion of the bracket 42. The bracket 42 is provided with a plurality (four in this embodiment) of outside air intake ports 61 in the inner peripheral portion 55b. The plurality of outside air intake ports 61 are arranged at intervals in the circumferential direction of the bracket 55 and penetrate the bracket 55 along the axial direction. The bracket 55 is provided with a plurality (two in this embodiment) of outside air discharge ports 62 located radially outside the outside air intake ports 61. The plurality of outside air discharge ports 62 are arranged at intervals in the circumferential direction of the bracket 55 and are provided along the axial direction of the bracket 55. The outside air intake ports 61 and the outside air discharge ports 62 communicate with each other through a cooling passage 63. The cooling passage 63 is partitioned by the brackets 42, 55 and the cooling fan 52, and the blade portion 52a of the cooling fan 52 is located therein.

[0020] The bracket 44 is provided with a plurality (four in this embodiment) of outside air intake ports 64 located radially outside the bearing 43. The plurality of outside air intake ports 64 are arranged at intervals in the circumferential direction of the bracket 44 and penetrate the bracket 44 along the axial direction. A cover 65 is arranged outside the bracket 56. The cover 65 has a ring shape and a circular hole 65a penetrating axially is formed in the central portion. The outer peripheral portion of the cover 65 is connected to the outer peripheral portion of the stator retainer plate 48, thereby covering the outside of the bracket 56, and a cooling passage 66 is provided between the bracket 56 and the cover 65. The outside air intake ports 64 communicate with one side of the cooling passage 66. The cooling passage 66 is partitioned by the bracket 44 and the cooling fan 54 and is also partitioned by the bracket 56 and the cover 65, and the blade portion 54a of the cooling fan 54 is located therein.

[0021] Ventilation passages 67 are respectively formed between the stator core 34 and each stator connection portion 49. Each ventilation passage 67 is provided parallel to the axial direction of the stator 22. The stator retainer plates 47, 48 are formed with through holes 47a, 48a at positions facing the ventilation passages 67. The ventilation passage 67 communicates with the other side of the cooling passage 66 through the through hole 48a and is open to the outside through the through hole 47a.

[0022] The rotor 21 has a plurality (four in this embodiment) of cooling holes 71 provided in the rotor iron core 32. The cooling holes 71 penetrate the rotor iron core 32 along the axial direction of the rotor iron core 32. The plurality of cooling holes 71 are provided at intervals in the circumferential direction of the rotor iron core 32. The rotor retainer plates 51 and the cooling fans 52 arranged on one side in the axial direction of the rotor iron core 32 each have a plurality (four in this embodiment) of through holes 72 and 73 provided therein. The through holes 72 and 73 penetrate the rotor retainer plates 51 and the cooling fans 52 along the axial direction of the rotor retainer plates 51 and the cooling fans 52. The plurality of through holes 72 and 73 are provided at intervals in the circumferential direction of the rotor retainer plates 51 and the cooling fans 52. Also, the rotor retainer plates 53 and the cooling fans 54 arranged on the other side in the axial direction of the rotor iron core 32 each have a plurality (four in this embodiment) of through holes 74 and 75 provided therein. The through holes 74 and 75 penetrate the rotor retainer plates 53 and the cooling fans 54 along the axial direction of the rotor retainer plates 53 and the cooling fans 54. The plurality of through holes 74 and 75 are provided at intervals in the circumferential direction of the rotor retainer plates 53 and the cooling fans 54.

[0023] The number of the plurality of cooling holes 71 provided in the rotor 21, the number of the plurality of through holes 72 and 74 provided in the rotor retainer plates 51 and 53, and the number of the plurality of through holes 73 and 75 provided in the cooling fans 52 are the same, and their radial positions and circumferential positions are the same. That is, the plurality of cooling holes 71 and the plurality of through holes 72, 73, 74, and 75 are arranged linearly along the axial direction. Also, the number of the outside air intake ports 61 and 64, the number of the cooling holes 71 and the through holes 72, 73, 74, and 75 are the same, their radial positions are the same, and their circumferential intervals are the same. Therefore, when the rotor 21 stops at a predetermined rotational position, the plurality of outside air intake ports 61 and 64, the plurality of cooling holes 71, and the plurality of through holes 72, 73, 74, and 75 are arranged in a straight line.

[0024] The bracket 55 is located radially outward of the outside air intake port 61, and a plurality (four in this embodiment) of screw holes 81 are provided. The plurality of screw holes 81 are arranged at intervals in the circumferential direction of the bracket 55 and penetrate the bracket 55 along the axial direction. A plurality (four in this embodiment) of lock bolts 82 are respectively screwed into the plurality of screw holes 81. The bracket 44 is located radially outward of the outside air intake port 64, and a plurality (four in this embodiment) of screw holes 83 are provided. The plurality of screw holes 83 are arranged at intervals in the circumferential direction of the bracket 44 and penetrate the bracket 44 along the axial direction. A plurality (four in this embodiment) of lock bolts 84 (locking mechanism) are respectively screwed into the plurality of screw holes 83. The lock bolts 82 and 84 can be positioned by fixing the rotor 21 so as not to rotate by abutting the tip portions against the cooling fans 52 and 54. Note that the tip portions of the lock bolts 82 and 84 do not necessarily have to directly abut against the cooling fans 52 and 54. For example, the lock bolt 84 may be rotated so that the tip portion presses a lock plate provided on the cooling fans 52 and 54 or the rotor 21 to operate and fix the rotor 21. Further, the lock bolt 84 may be rotated so that the tip portion is screwed into a screw hole provided in the cooling fans 52 and 54 or the rotor 21 to fix the rotor 21. Further, the locking mechanism is not limited to the lock bolt 84 and may be other mechanisms.

[0025] When the rotor 21 rotates, the cooling fans 52 and 54 rotate. When the cooling fan 52 rotates, outside air is taken into the cooling passage 63 from the outside air intake port 61. The outside air taken into the cooling passage 63 cools one axial side of the rotor 21 when flowing through the cooling passage 63 and is discharged to the outside from the outside air discharge port 62. On the other hand, when the cooling fan 54 rotates, outside air is taken into the cooling passage 66 from the outside air intake port 64. The outside air taken into the cooling passage 66 cools the other axial side of the rotor 21 when flowing through the cooling passage 66 and flows into the ventilation passage 67 from the through hole 48a. The outside air taken into the ventilation passage 67 cools the stator 22 when flowing through the ventilation passage 67 and is discharged to the outside from the through hole 47a.

[0026] Also, the outside air taken in from the outside air inlets 61 and 64 into the cooling passages 63 and 66 flows into the cooling holes 71 of the rotor 21. By flowing through the cooling holes 71, the outside air cools the rotor 21.

[0027] FIG. 3 is a side view of the connection part side in the rotating electrical machine.

[0028] On the connection part side of the rotating electrical machine 11, the rotating shaft 31 is located at the center position. The rotating shaft 31 is rotatably supported by a bearing 43 (see FIG. 2) via a bracket 44. The plurality of outside air inlets 64 are provided at intervals in the circumferential direction around the rotating shaft 31. The plurality of outside air outlets 68 are provided at intervals in the circumferential direction around the rotating shaft 31.

[0029] FIG. 4 is a side view of the non-connection part side in the rotating electrical machine.

[0030] On the non-connection part side of the rotating electrical machine 11, the rotating shaft 31 is located at the center position. The rotating shaft 31 is rotatably supported by a bearing 41 (see FIG. 2) via a bracket 55. The plurality of outside air inlets 61 are provided at intervals in the circumferential direction around the rotating shaft 31. The plurality of outside air outlets 62 are provided at intervals in the circumferential direction around the rotating shaft 31. Further, the bracket 55 is provided with an opening 91 at the upper part and an opening 92 at the lower part.

[0031] Note that the rotating electrical machine 11 is provided with an upper mounting part 96, a lower mounting part 97, and a stopper 98 on the outer peripheral part. The upper mounting part 96 and the lower mounting part 97 are interfaces for fixing the rotating electrical machine 11 to the vehicle body. The stopper 98 is used as a lifting tool when transporting the rotating electrical machine 11 and abuts against the axle 14 (see FIG. 1) when the rotating electrical machine 11 falls to suppress damage due to dropping.

[0032] <Cleaning method of rotating electrical machine> FIG. 5 is a flowchart showing the cleaning method of the rotating electrical machine according to the first embodiment.

[0033] In step S11, the operator jacks up the wheels 15 (see FIG. 1) of the carriage. When the wheels 15 of the carriage are jacked up, the wheels 15 float from the rails. Then, the operator can freely rotate the wheels 15.

[0034] In step S12, the operator removes the dust around the plurality of outside air inlets 61, 64. According to the long-term specifications, dust and dirt adhere to the outer surfaces of the brackets 55, 44 in which the outside air inlets 61, 64 are formed for the rotating electric machine 11. Therefore, prior to cleaning the cooling holes 71, the dust around the outside air inlets 61, 64 is removed so that the dust and dirt adhering to the outer surfaces of the brackets 55, 44 do not enter the inside of the rotating electric machine 11 from the outside air inlets 61, 64.

[0035] In step S13, the operator rotates the wheel 15 using a rotation jig or the like, and aligns the position of the cooling holes 71 provided in the rotor 21 with the position of the outside air inlets 61, 64. As a result, the cooling holes 71 and the outside air inlets 61, 64 are linearly arranged along the axial direction, and it becomes possible to access the cooling holes 71 of the rotor 21 from the outside of the rotating electric machine 11 through the outside air inlets 61, 64.

[0036] In step S14, the operator makes the rotor 21 non-rotatable. The carriage is jacked up and the wheels 15 float from the rails, and the wheels 15 can rotate freely. By fixing the rotor 21 to the stator 22 side so that the wheels 15 do not rotate freely, the position of the cooling holes 71 of the rotor 21 is prevented from shifting with respect to the outside air inlets 61, 64.

[0037] Here, the operations of steps S11 to S14 described above will be described with reference to the drawings. FIG. 6 is an upper cross-sectional view of the rotating electric machine showing the fixed state of the rotor.

[0038] The rotor 21 of the rotating electric machine 11 is drivingly connected to the wheels 15 via the rotating shaft 31, the drive shaft 16, the coupling 12, the connecting shaft 17, the reduction gear 13, and the axle 14. Therefore, when the wheels 15 are jacked up and lifted off the rails, and an operator rotates the wheels 15, the rotor 21 rotates together with the rotating shaft 31. The rotating shaft 31 has a key groove 31a at its axial end. The position of the key groove 31a to be formed in the rotating shaft 31 is set in advance so that the cooling holes 71 align with the outside air intakes 61 and 64 when the key groove 31a is positioned at a predetermined rotational position, for example, directly above in the vertical direction. The operator rotates the wheels 15 while observing the key groove 31a, and aligns the position of the cooling holes 71 with the outside air intakes 61 and 64. When the position of the cooling hole 71 is aligned with the position of the outside air intakes 61, 64, the cooling hole 71 and the outside air intakes 61, 64 are aligned in a straight line along the axial direction. In this state, the worker rotates the multiple lock bolts 82, 84 so that their tips abut against the cooling fans 52, 54. The cooling fans 52, 54 are then supported by the brackets 55, 44 via the lock bolts 82, 84 and cannot rotate. The rotor 21, to which the cooling fans 52, 54 are fixed, also cannot rotate and is supported unrotatably relative to the stator 22. The rotor 21 may also be made unrotatable by directly abutting the lock bolts 82, 84 against the rotor 21.

[0039] Returning to FIG. 5 , in step S15, the worker inserts the cleaning brush 101 into the cooling hole 71 from one of the outside air inlets 64. The brush 101 has a length that reaches from the outside to the cooling hole 71, and has a bristle portion 101a with many bristles fixed to its tip. Therefore, when the cleaning brush 101 is inserted from the outside air inlet 64, the bristle portion 101a of the cleaning brush 101 reaches and comes into contact with the inner surface of the cooling hole 71. In this case, the length of the bristles of the bristle portion 101a is such that the tip is pressed against the inner surface of the cooling hole 71 when the bristle portion 101a is positioned in the cooling hole 71.

[0040] In step S16, the worker reciprocates the brush 101, thereby causing the bristle portion 101a pressed against the inner surface of the cooling hole 71 to move back and forth within the cooling hole 71. At this time, the worker reciprocates the brush 101 over the length of the cooling hole 71. As a result, the bristle portion 101a of the brush 101 moves while being pressed against the inner surface of the cooling hole 71, so that the bristle portion 101a scrapes off and removes dust adhering to the inner surface of the cooling hole 71.

[0041] In step S17, the worker removes the cleaning brush 101 from the outside air inlet 64. That is, when the brush 101 is moved back and forth, the bristle portion 101a scrapes off and removes dust adhering to the inner surface of the cooling hole 71, thereby exposing the inner surface of the cooling hole 71. Once the dust has been removed from the inner surface of the cooling hole 71, the worker removes the cleaning brush 101 from the cooling hole 71.

[0042] The above-mentioned operation of step S15 will be described with reference to the drawings. Fig. 7 is a cross-sectional view of the upper side of the rotating electrical machine, showing the state when the brush is inserted.

[0043] An operator inserts a cleaning brush 101 from one of the outside air inlets 64 through the through-holes 74, 75 into the cooling hole 71. The brush 101 has a bristle portion 101a with many bristles fixed to the tip of a straight rod, and the bristle portion 101a is long enough to reach from the outside air inlet 64 to the cooling hole 71. When the bristle portion 101a of the brush 101 is inserted into the cooling hole 71, the tips of the bristles of the bristle portion 101a come into contact with and are pressed against the inner surface of the cooling hole 71.

[0044] Next, the operation of step S16 will be described with reference to the drawings. Figure 8 is a cross-sectional view of the upper side of the rotating electrical machine, showing the state of brushing the cooling holes.

[0045] The operator reciprocates the brush 101 with the tips of the bristles of the bristle implantation part 101a of the brush 101 pressed against the inner surface of the cooling holes 71. Then, as the bristle implantation part 101a of the brush 101 rubs against the inner surface of the cooling holes 71, the dust adhering to the inner surface of the cooling holes 71 is scraped off and removed. At this time, the brush 101 may be reciprocally rotated in the circumferential direction to scrape off the dust adhering to the inner surface of the cooling holes 71 by the bristle implantation part 101a.

[0046] Returning to FIG. 5, in step S18, it is confirmed whether the dust scraping operation by the brush 101 has been completed for all the cooling holes 71. Here, when the dust scraping operation by the brush 101 has not been completed for all the cooling holes 71 (No), the process returns to step S15, and the operations from step S15 to step S18 are repeated. On the other hand, when the dust scraping operation by the brush 101 has been completed for all the cooling holes 71 (Yes), the process proceeds to step S19.

[0047] In the operations from step S11 to step S18, the main cleaning operation of the rotating electrical machine 11 is completed. The dust adhering to each cooling hole 71 of the rotor 21 is scraped off and removed by the brush 101. The removed dust remains in the cooling holes 71, but is discharged to the outside when the rotating electrical machine 11 is in use. That is, when the rotor 21 rotates, the cooling fans 52, 54 rotate, outside air is taken into the cooling passages 63, 66 from the outside air intake ports 61, 64, and flows into each cooling hole 71. Therefore, the dust remaining in the cooling holes 71 is discharged from the cooling holes 71 by the outside air and discharged to the outside from the outside air discharge ports 62, 68.

[0048] However, it is preferable to prevent the scattering of dust by actively discharging and collecting the dust remaining in each cooling hole 71 of the rotor 21 to the outside of the rotating electrical machine 11. In this case, the operations after step S19 described below are performed.

[0049] In step S19, the operator inserts the guide nozzle 102 into the outside air intake port 64. The guide nozzle 102 has a cylindrical shape and has a length reaching from the outside air intake port 64 to the through hole 75. The guide nozzle 102 forms a linearly connected flow path from the outside to the cooling hole 71 through the through holes 75 and 74.

[0050] Regarding the operation of step S19 described above, it will be described with reference to the drawings. FIG. 9 is an upper cross-sectional view of the rotating electrical machine showing the mounting state of the guide nozzle.

[0051] The operator inserts the guide nozzle 102 into the outside air intake port 64 from the outside. The guide nozzle 102 is, for example, a hollow bolt. The hollow bolt as the guide nozzle 102 has a head 102a and a cylindrical portion 102b. The hollow bolt is provided with a through hole 102d penetrating in the axial direction by forming a hexagonal hole 102c in the head 102a. The tip of the guide nozzle 102 is passed through the through hole 75, and the head 102a abuts against the outer surface of the bracket 44. Note that the guide nozzle 102 is not limited to a hollow bolt, and may be, for example, a cylindrical tube or the like. Further, the tip of the guide nozzle 102 is preferably inserted through the through hole 75, but may be passed through the through hole 74. That is, the shape of the guide nozzle 102 is not limited as long as it serves as a guide for forming a flow path for supplying air from the outside to the cooling hole 71 between the outside and the cooling hole 71.

[0052] Returning to FIG. 5, in step S20, the operator attaches the air gun 103 to the guide nozzle 102 from the outside. The air gun 103 supplies air. The air gun 103 supplies air to the cooling hole 71 through the guide nozzle 102.

[0053] In step S21, the operator attaches the dust collecting net 104 and the plug 105. The dust collecting net 104 collects dust removed from the cooling hole 71 and discharged by air, and covers the outside air intake port 61 and the outside air discharge port 62. The plug 105 closes a plurality of through holes 47a to which the guide nozzle 102, the air gun 103, and the dust collecting net 104 are not attached.

[0054] Regarding the operations of step S20 and step S21 described above, an explanation will be given with reference to the drawings. FIG. 10 is an upper cross-sectional view of a rotating electric machine showing the mounting state of the air gun and the dust collecting net 104.

[0055] The operator holds the air gun 103 and fits the nozzle portion 103a having a hexagonal shape at the tip into the hexagonal hole 102c of the guide nozzle 102 from the outside. At this time, the air gun 103 may be held by the guide nozzle 102 or may be held by the operator. Further, the operator attaches the dust collecting net 104 to one side of the rotating electric machine 11. The dust collecting net 104 has a mesh bag shape that allows air to pass through but does not allow fine dust and dirt to pass through. The dust collecting net 104 covers a plurality of outside air intake ports 61 and a plurality of outside air discharge ports 62. Further, the operator attaches the plug 105 to a plurality of through holes 47a provided in the outer peripheral portion of the rotating electric machine 11. The plug 105 closes the plurality of through holes 47a.

[0056] Returning to FIG. 5, in step S22, the operator operates the air gun 103 and injects air (gas) from the nozzle portion 103a into the through hole 102d of the guide nozzle 102. The air injected from the nozzle portion 103a is supplied from the through hole 102d of the guide nozzle 102 to the cooling hole 71. Then, the dust removed by the brush 101 and accumulated in the cooling hole 71 is conveyed by the air and discharged to the dust collecting net 104.

[0057] In step S23, the air gun 103 and the guide nozzle 102 are removed. That is, when air is supplied to the cooling hole 71 through the guide nozzle 102 by the air gun 103, the dust accumulated in the cooling hole 71 is discharged. When the dust is discharged from the cooling hole 71, the operator removes the air gun 103 and the guide nozzle 102.

[0058] In step S24, it is confirmed whether the dust discharge operation by air has been completed for all cooling holes 71. If the dust discharge operation by air has not been completed for all cooling holes 71 (No), the process returns to step S19, and the operations from step S19 to step S24 are repeated. If the guide nozzles 102 have been inserted into all outside air intake ports 64 in step S19, the process returns to step S20, and the operations from step S20 to step S24 are repeated. On the other hand, if the dust discharge operation by air has been completed for all cooling holes 71 (Yes), the process proceeds to step S25.

[0059] In step S25, the worker removes the dust collection net 104 and the plug 105. At this time, the dust collection net 104 contains dust discharged from each cooling hole 71, and it is preferable to remove it from the bracket 55 to prevent the dust from scattering.

[0060] In step S26, the worker loosens the lock bolts 82 and 84 to release the fixed rotor 21 and make the rotor 21 rotatable.

[0061] In step S27, the worker jacks down the wheels 15 (see FIG. 1) of the dolly, thereby causing the wheels 15 to land on the rails. By jacking down the wheels 15 of the dolly, the wheels 15 land on the rails and become able to rotate freely on the rails.

[0062] Here, the path of dust discharge by cleaning air will be described. Fig. 11 is a cross-sectional view of a rotating electrical machine showing the path of supply of cleaning air.

[0063] Air supplied from air gun 103 passes from through hole 102d of guide nozzle 102 through through holes 74 and 75 and is supplied to cooling hole 71. Here, dust that has accumulated in cooling hole 71 is carried by the air, passes through through holes 72 and 73 and cooling passage 63, and is discharged from outside air intake port 61 to dust collection net 104. Dust that has accumulated in cooling hole 71 also passes through through holes 72 and 73 and cooling passage 63, and is discharged from outside air discharge port 62 to dust collection net 104.

[0064] [Second Embodiment] In the second embodiment, the rotating electrical machine is the same as that in the first embodiment, and will be described with reference to FIGS. 1 and 2. Note that members having the same functions as those in the above-described first embodiment are denoted by the same reference numerals, and detailed descriptions thereof are omitted.

[0065] In the second embodiment, among the plurality of outside air intake ports 61 and the plurality of outside air discharge ports 62, an air gun is attached to one outside air intake port 61, a dust collecting net is attached to one outside air discharge port 62, and plug stoppers are attached to the remaining outside air intake ports 61 and outside air discharge ports 62 to perform a cleaning operation of the cooling holes 71.

[0066] FIG. 12 is a side view of the connection portion side of the rotating electrical machine.

[0067] On the connection portion side of the rotating electrical machine 11, the plurality of outside air intake ports 64 are provided at intervals in the circumferential direction around the rotating shaft 31, and the plurality of outside air discharge ports 68 are provided at intervals in the circumferential direction around the rotating shaft 31. By attaching a plug stopper 111 to the plurality of outside air discharge ports 68, the outside air discharge ports 68 are closed.

[0068] FIG. 13 is a side view of the non-connection portion side of the rotating electrical machine.

[0069] On the non-connection portion side of the rotating electrical machine 11, the plurality of outside air intake ports 61 are provided at intervals in the circumferential direction around the rotating shaft 31, and the plurality of outside air discharge ports 68 are provided at intervals in the circumferential direction around the rotating shaft 31. Further, the bracket 55 is provided with an opening 91 at the upper part and an opening 92 at the lower part. By attaching a plug stopper 112 to the upper outside air discharge port 62, the outside air discharge port 62 is closed. By attaching plug stoppers 113 and 114 to the plurality of openings 91 and 92, the openings 91 and 92 are closed. By attaching plug bolts 115 to the plurality of outside air intake ports 61, the outside air intake ports 61 are closed. Note that, as will be described later, a dust collecting net 116 is attached to the lower outside air discharge port 62.

[0070] FIG. 14 is a flowchart showing a method for cleaning a rotating electrical machine according to the second embodiment.

[0071] In step S11, the worker jacks up the wheels 15 (see FIG. 1) of the carriage to lift the wheels 15 off the rails.

[0072] In step S31, an operator installs block plugs 111, 112, 113, and 114 in predetermined positions. That is, block plug 111 closes upper and lower outside air exhaust ports 68. Block plug 112 closes upper outside air exhaust port 62. Block plugs 113 and 114 close multiple openings 91 and 92.

[0073] The operations from step S12 to step S20 are almost the same as those in the first embodiment, and therefore a description thereof will be omitted.

[0074] In step S21, the worker installs the dust collection net 116 and the plug 105. The dust collection net 116 collects dust removed from the cooling holes 71 and discharged by the air, and covers the outside air discharge port 62. In other words, it aggregates the dust discharge ports in one location. The plug 105 closes the multiple through-holes 47a to which the guide nozzle 102, air gun 103, and dust collection net 104 are not attached.

[0075] In step S22, the worker activates air gun 103 to spray air into guide nozzle 102. The air sprayed from air gun 103 is supplied from guide nozzle 102 to cooling hole 71. Then, dust removed by brush 101 and accumulated in cooling hole 71 is carried by the air and discharged into dust collection net 116.

[0076] The operations from step S23 to step S27 are almost the same as those in the first embodiment, and therefore a description thereof will be omitted.

[0077] Here, the path of dust discharge by cleaning air will be described. Fig. 15 is a cross-sectional view of a rotating electrical machine showing the path of supply of cleaning air.

[0078] The air supplied from the air gun 103 is supplied to the cooling holes 71 through the through holes 74 and 75 from the through hole 102d of the guide nozzle 102. Here, the dust accumulated in the cooling holes 71 is conveyed by the air, passes through the through holes 72 and 73 and the cooling passage 63, and is discharged from one outside air discharge port 62 to the dust collecting net 116.

[0079] [Effects of the Embodiment] The cleaning method of the rotating electrical machine according to the present embodiment includes a step of rotating the rotor 21 to linearly arrange the cooling holes 71 and the outside air intake port (first outside air port) 64, and operating the lock bolt (locking mechanism) 84 to fix the rotor 21 so that it does not rotate, and inserting a brush (cleaning brush) 101 from the outside air intake port 64 into the cooling holes 71, pressing the brush 101 against the inner surface of the cooling holes 71 and moving it in the axial direction to scrape off the dust adhering to the inner surface of the cooling holes 71.

[0080] Therefore, since the radial positions of the cooling holes 71 of the rotor and the outside air intake port 64 of the bracket 44 are the same, when the rotor 21 is rotated, the cooling holes 71 and the outside air intake port 64 can be linearly arranged. Here, when the rotor 21 is fixed so as not to rotate, the linear state of the cooling holes 71 and the outside air intake port 64 is maintained. In this state, when the brush 101 is inserted from the outside air intake port 64 into the cooling holes 71 and moved in the axial direction, the dust adhering to the inner surface of the cooling holes 71 is scraped off by the brush 101. As a result, the dust firmly adhering to the inner surface of the cooling holes 71 can be properly removed by the brush 101, and the cleaning work can be optimized.

[0081] The method for cleaning a rotating electrical machine according to this embodiment includes the steps of providing a dust collection net 104 that covers the outside air inlet (second outside air inlet) 61 from the outside, and supplying gas from the outside air inlet 64 to the cooling holes 71 and discharging dust scraped off the inner surfaces of the cooling holes 71 together with the gas from the outside air inlet 61 to the dust collection net 104. Therefore, by moving in the axial direction, the brush 101 scrapes off dust adhering to the inner surfaces of the cooling holes 71 and remains in the cooling holes 71. Here, by supplying gas from the outside air inlet 64 to the cooling holes 71, the dust remaining in the cooling holes 71 can be discharged to the outside. The dust discharged from the cooling holes 71 is collected by the dust collection net 104, thereby preventing the dust from scattering around the rotating electrical machine.

[0082] In the method for cleaning a rotating electric machine of this embodiment, a cylindrical guide nozzle 102 is inserted into the outside air inlet 64 to form a flow path for supplying gas from the outside to the cooling holes 71 through the guide nozzle 102, and the gas is supplied to the cooling holes 71 through the flow path. Therefore, the cooling holes 71 of the rotor and the outside air inlet 64 of the bracket 44 are separated in the axial direction, making it difficult for gas to be supplied to the cooling holes 71 through the outside air inlet 64. The guide nozzle 102 forms a flow path connecting the outside air inlet 64 and the cooling holes 71, so that gas from the outside can be properly supplied to the cooling holes 71 through the flow path formed by the guide nozzle 102. As a result, dust remaining in the cooling holes 71 can be properly discharged into the dust collection net 104 by the supplied gas.

[0083] The cleaning method of the rotating electrical machine according to this embodiment is as follows. The rotor 21 has cooling fans 52 and 54 fixed to the axial end portions. Through holes 73 and 74 are formed in the cooling fans 52 and 54 along the axial direction of the rotor 21. The guide nozzle 102 is inserted into the outside air intake port 64, the base end portion of the guide nozzle 102 is supported by the outside air intake port 64, and the tip end portion of the guide nozzle 102 is supported by the through hole 74. Therefore, the guide nozzle 102 inserted into the outside air intake port 64 is in a cantilever support state and is unstable. Thus, by supporting the base end portion of the guide nozzle 102 by the outside air intake port 64 and the tip end portion by the through hole 74, the guide nozzle 102 becomes a simply supported beam and is stabilized. As a result, the gas from the outside can be properly supplied to the cooling holes 71 through the flow path formed by the guide nozzle 102.

[0084] In the cleaning method of the rotating electrical machine according to this embodiment, a plurality of outside air intake ports 61 and 64 and outside air discharge ports 62 and 68 are provided. One of the plurality of outside air intake ports 64 is kept open, a dust collecting net 116 is attached to one of the plurality of outside air discharge ports 62 among the plurality of outside air intake ports 61 and outside air discharge ports 62, and plugs 111, 112, 113, and 114 are attached to the remaining outside air intake ports 61 and 64 and outside air discharge ports 62 and 68. Gas is supplied from the open outside air intake port 64 to the cooling holes 71, and the dust scraped from the cooling holes 71 is discharged together with the gas from the outside air discharge port 62 to the dust collecting net 116. Therefore, when the outside air intake ports 61 and 64 and the outside air discharge ports 62 and 68 other than one outside air intake port 64 and one outside air discharge port 62 are blocked, one flow path is formed from the outside air intake port 64 through the cooling holes 71 to the outside air discharge port 62. Here, when gas from the outside is supplied to the outside air intake port 64, the supplied gas is supplied to the cooling holes 71, and the dust remaining in the cooling holes 71 can be discharged from the outside air discharge port 62 to the dust collecting net 116. At this time, since the gas and the dust flow through one limited flow path, the flow velocity of the gas increases. As a result, the dust remaining in the cooling holes 71 can be appropriately discharged by the gas flowing at high speed and collected in the dust collecting net 104.

[0085] In the above-described embodiments, the brush 101 is inserted from the outside air intake port 64 into the cooling holes 71, or air is supplied from the outside air intake port 64 to the cooling holes 71, and the dust collecting nets 104 and 116 are attached to the outside air intake port 61 and the outside air discharge port 62 side, but the reverse may also be possible.

[0086] Also, in the above-described embodiments, the rotating electrical machine of this embodiment has been described as a totally enclosed induction motor, but it is not limited to this configuration.

[0087] As described above, some embodiments of the present invention have been described. However, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and its equivalent scope.

Explanation of Reference Numerals

[0088] 10 Driving device 11 Rotating electrical machine 12 Coupling 13 Reduction gear 14 Axle 15 Wheel 16 Drive shaft 17 Connecting shaft 21 Rotor 22 Stator 31 Rotating shaft 32 Rotor iron core 33 Rotor bar 34 Stator iron core 35 Stator coil 41, 43 Bearing 42 Bracket 44 Bracket (first support member) 45, 46 Support portion 47, 48 Stator holding plate 49 Stator connecting portion 51, 53 Rotor holding plate 52, 54 Cooling fan 55 Bracket (Second Support Member) 56 Bracket 57, 58 Labyrinth Seal 61 Outside Air Intake Port (Second Outside Air Port) 62 Outside Air Exhaust Port (Second Outside Air Port) 63, 66 Cooling Passage 64 Outside Air Intake Port (First Outside Air Port) 65 Cover 67 Ventilation Passage 68 Outside Air Exhaust Port (First Outside Air Port) 71 Cooling Hole 72, 73, 74, 75 Through-Hole 81, 83 Screw Hole 82, 84 Lock Bolt 91, 92 Opening 101 Brush (Cleaning Brush) 102 Guide Nozzle 103 Air Gun 104 Dust Collection Net 105 Plug 111, 112, 113, 114 Plug 115 Plug Bolt 116 Dust Collection Net

Claims

1. A stator having a cylindrical shape, A rotor disposed inward in the radial direction of the stator, having cooling holes penetrating axially along a position radially offset outward by a predetermined length from the rotation center, A first support member fixed to one axial end of the stator, rotatably supporting one axial end of the rotor, and having a first outside air port penetrating axially at a position radially offset outward by the predetermined length from the rotation center of the rotor, A second support member fixed to the other axial end of the stator, rotatably supporting the other axial end of the rotor, and having a second outside air port penetrating axially at a position radially offset outward by the predetermined length from the rotation center of the rotor and at the same circumferential position as the first outside air port, A locking mechanism provided on the first support member or the second support member, A first cooling fan fixed to one axial end of the rotor, A second cooling fan fixed to the other axial end of the rotor, A cleaning method for a rotating electrical machine comprising: Rotating the rotor to linearly align the cooling holes, the first outside air port, and the second outside air port, and operating the locking mechanism to fix the rotor so that it does not rotate, Inserting a cleaning brush from the first outside air port into the cooling holes, pressing the cleaning brush against the inner surface of the cooling holes and moving axially to scrape off dust adhering to the inner surface of the cooling holes, A cleaning method for a rotating electrical machine having the above steps.

2. Providing a dust collecting net to cover the second outside air port from the outside, Supplying gas from the first outside air port to the cooling holes, and discharging the dust scraped from the inner surface of the cooling holes together with the gas from the second outside air port to the dust collecting net, The cleaning method for a rotating electrical machine according to Claim 1, having the above steps.

3. By inserting a cylindrical guide nozzle into the first outside air port, a flow path for supplying gas to the cooling holes through the guide nozzle from the outside is formed, and the gas is supplied to the cooling holes through the flow path, The cleaning method for a rotating electrical machine according to Claim 2.

4. Through holes are formed in the first cooling fan and the second cooling fan along the axial direction of the rotor, Inserting the guide nozzle into the first outside air port, supporting the base end portion of the guide nozzle at the first outside air port, and supporting the tip end portion of the guide nozzle at the through hole, The cleaning method for a rotating electrical machine according to Claim 3.

5. a plurality of the first outside air vents and a plurality of the second outside air vents are provided; one of the plurality of first outside air ports is opened, The dust collection net is attached to one of the second outside air ports among the plurality of second outside air ports; attaching plugs to the remaining first outside air port and second outside air port; Gas is supplied to the cooling hole from the opened first outside air port, and dust scraped off from the cooling hole is discharged together with the gas from the second outside air port to the dust collection net. The method for cleaning a rotating electrical machine according to any one of claims 2 to 4.

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