JP5723855B2 - Rotating electric machine - Google Patents

Description

  The present invention relates to a rotating electrical machine provided with a cooling fan.

  Patent Document 1 discloses a rotating electrical machine in which a cooling fan is provided on a rotating shaft. The cooling fan sends cooling air in the axial direction of the rotating shaft, and the cooling air passes away the heat generated in the rotor and the stator through the case.

JP-A-9-322479

  However, in the rotating electrical machine disclosed in Patent Document 1, since the cooling air is sent from one end side to the other end side in the axial direction of the rotating shaft, the entire stator fixed to the inner peripheral wall of the case There was a problem that could not be cooled sufficiently.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a rotating electrical machine that can cool a stator efficiently by a cooling fan.

The present invention is a rotating electrical machine including a stator fixed to an inner peripheral wall of a case and a rotor fixed to a rotating shaft and rotating inside the stator, and a cooling fan that is rotationally driven by the rotating shaft further comprising a cooling fan includes a fan body which is coupled to a rotation shaft, a fan opening which opens into the fan body, a plurality of blades facing the outer peripheral wall of the case extending to the fan opening portion, When the cooling fan rotates, the blade sends cooling air from the outside of the blade to the inside through the fan opening toward the outer peripheral wall.

  In the present invention, during operation of the rotating electrical machine, the cooling fan is driven to rotate by the rotating shaft, and the cooling air sent by the blade is directly applied to the outer peripheral wall of the case where the stator is disposed, so that the stator is efficiently Can be cooled.

It is sectional drawing of the rotary electric machine which concerns on embodiment of this invention. It is sectional drawing which follows the AA line of FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  A rotating electrical machine 1 shown in FIG. 1 is an induction motor or a synchronous motor that drives a driven object. Moreover, you may use the rotary electric machine 1 as a generator driven by a drive thing.

  The rotating electrical machine 1 includes a stator (stator) 20 fixed to the case inner peripheral wall 40 </ b> A of the case 40, and a rotor (rotor) 30 supported by the rotating shaft 10. The rotor 30 generates a driving force by an electromagnetic force generated in the stator 20. The rotating shaft 10 and the rotor 30 rotate around the center line O.

  In the “radial direction”, “circumferential direction”, and “axial direction”, the radial direction around the center line O of the rotor 30, the direction around the center line O, and the center line O extend, respectively. Means direction.

  The case 40 includes a cylindrical stator frame 41, and disk-shaped first bracket 45 and second bracket 46 that are coupled to both ends of the stator frame 41. The first bracket 45 and the second bracket 46 are formed separately from the case 40. However, the configuration is not limited thereto, and one of the first bracket 45 and the second bracket 46 may be formed integrally with the case 40.

  The case 40 defines a housing chamber 29 that houses the stator 20 and the rotor 30 by the stator frame 41, the first bracket 45, and the second bracket 46. Ventilation ports 47 and 48 are formed in the brackets 45 and 46 that define both ends of the storage chamber 29, respectively.

  The inner peripheral portion of the stator frame 41 constitutes the case inner peripheral wall 40A. The stator 20 includes an iron core 21 fixed to the case inner peripheral wall 40 </ b> A and a plurality of coils 22 wound around the iron core 21.

  The outer periphery of the stator frame 41 constitutes the case outer peripheral wall 40B. A plurality of heat radiating fins 42 are provided on the case outer peripheral wall 40B. The heat radiating fins 42 are formed as ribs standing in the radial direction from the outer peripheral surface of the case outer peripheral wall 40B. The radiating fins 42 are extended along the axial direction. As shown in FIG. 2, the radiation fins 42 are arranged side by side at equal intervals in the circumferential direction.

  The rotating shaft 10 is rotatably supported via a bearing 15 provided at the center of the first bracket 45 and is rotatably supported via a bearing 16 provided at the center of the second bracket 46. The

  One end of the rotating shaft 10 protruding from the first bracket 45 constitutes the first output unit 11 connected to the driven object.

  The other end of the rotating shaft 10 protruding from the second bracket 46 constitutes the second output unit 12 to which the cooling fan 50 is connected.

  The cooling fan 50 includes a bottomed cylindrical fan main body 51 connected to the rotation shaft 10. Similar to the impeller of a sirocco fan used as a wide-flow fan, the fan body 51 is connected to the rotary shaft 10 and extends in the radial direction, and extends from the disk portion 52 in the axial direction. And a cylindrical portion 53 having a plurality of blades (blades) 55.

  The disc part 52 is coupled to the second output part 12 of the rotating shaft 10. Thereby, the cooling fan 50 is rotationally driven by the rotating shaft 10.

  The disk part 52 is formed integrally with the cylindrical part 53. However, the configuration is not limited to this, and the disk portion 52 and the cylindrical portion 53 may be formed separately.

  The disc part 52 is arranged with a disc-like gap (space) in the case end wall 40C constituted by the second bracket 46, and defines a disc-like flow path 62 between the case end wall 40C and the disc part 52.

  The cylindrical portion 53 is disposed with a cylindrical gap (space) on the case outer peripheral wall 40B of the stator frame 41, and defines a cylindrical flow path 61 between the case 53 and the case outer peripheral wall 40B.

  A fan opening 59 is formed in the middle of the cylindrical portion 53. The cylindrical portion 53 has a fan cylindrical front end portion 53 </ b> A and a fan cylindrical base end portion 53 </ b> B that extend on both sides of the fan opening 59.

  A plurality of blades 55 extending in the axial direction are formed in the fan opening 59 of the cylindrical portion 53 so as to be arranged at equal intervals on a circumference centered on the center line O. The blade 55 is provided corresponding to the stator 20 and is disposed so as to face the case outer peripheral wall 40B of the case 40 in which the stator 20 is disposed. As will be described later, the blade 55 rotates around the center line O to send outside air as cooling air to the inside of the cylindrical portion 53.

  The blade 55 is integrally formed with the fan main body 51. One end of the blade 55 is formed so as to be connected to the fan cylindrical tip 53A. The other end of the blade 55 is formed to be connected to the fan cylinder base end portion 53B. However, the present invention is not limited to this, and the blade 55 may be formed separately from the fan main body 51.

  A cooling flow path 60 is defined between the fan main body 51 of the cooling fan 50 and the case 40. The cooling channel 60 is configured by the cylindrical channel 61 and the disc-shaped channel 62.

  The cylindrical channel 61 is defined as a cylindrical space extending in the axial direction. The cylindrical flow path 61 includes a first cylindrical flow path 61A defined along the fan cylindrical tip 53A, a blade inner cylindrical flow path 61C defined along the blade 55, and a fan cylinder base end. A second cylindrical channel 61B defined along the portion 53B.

  In the cooling flow path 60, one end (the left end in FIG. 1) of the first cylindrical flow path 61A is a first outlet 63 that opens to the outside. The first outlet 63 is annularly defined between the opening end 53 </ b> C of the cylindrical portion 53 and the one end 41 </ b> A of the stator frame 41.

  The disk-shaped channel 62 is defined as a disk-shaped space extending in the radial direction from one end of the cylindrical channel 61. A plurality of holes are formed in the disk portion 52 as the second outlet 56 of the cooling channel 60. The disk-shaped channel 62 communicates with the outside through the second outlet 56. The plurality of second outlets 56 are formed so as to be arranged at equal intervals on a circumference centered on the center line O. Although the 2nd exit 56 is formed in circular shape, it is not restricted to this, For example, circular arc shape and other shapes may be sufficient.

  In FIG. 2, the blade 55 is formed to be inclined with respect to a straight line H that intersects the center line O and extends in the radial direction. Accordingly, the blade 55 rotates in the direction indicated by the arrow B in FIG. 2, so that the cooling air (outside air) flows from the outside to the inside of the blade 55 (cooling fan 50) as indicated by the arrow C in FIGS. It is designed to send in the radial direction.

  As shown by arrows D and E in FIG. 1, the cooling air sent into the blade inner cylindrical channel 61C by the blade 55 is axially transferred to the first cylindrical channel 61A and the second cylindrical channel 61B. The current is diverted toward both ends of the stator 20. As shown by the arrow D in FIG. 1, the cooling air diverted to the first cylindrical channel 61 </ b> A flows out from the first outlet 63 to the outside as shown by the arrow F. On the other hand, the cooling air diverted to the second cylindrical flow path 61B as shown by the arrow E in FIG. 1 flows out from the second outlet 56 to the outside through the disc-shaped flow path 62 as shown by the arrow G. To do.

  Note that the duct is not limited to the above-described configuration, and a duct that guides the cooling air that has passed through the first outlet 63 to flow into the accommodation chamber 29 through the ventilation port 47 may be provided. Further, the second outlet 56 opened in the second bracket 46 is eliminated, and the cooling air diverted to the second cylindrical channel 61B is discharged to the outside through the ventilation port 48, the storage chamber 29, and the ventilation port 47. It is good also as a structure to be.

  The length L1 of the blade 55 in the axial direction is set to be equal to or longer than the length L2 of the stator 20. Thereby, the cooling air sent into the blade inner cylindrical flow path 61C by the blade 55 hits the entire region of the case outer peripheral wall 40B in the axial direction, and the case outer peripheral wall 40B is uniformly cooled in the axial direction. Further, the entire stator 20 can be efficiently cooled.

  The heat generated in the stator 20 by the current flowing through the coil 22 during the operation of the rotating electrical machine 1 is between the air when the cooling air sent by the blade 55 of the cooling fan 50 flows through the blade inner cylindrical flow path 61C. The heat is exchanged through the case outer peripheral wall 40B. Since the cooling fan 50 sends the cooling air to the blade inner cylindrical flow path 61C by the rotation of the blade 55, the air pressure can be increased and a stable air volume can be secured.

  According to the above embodiment, there exists an effect shown below.

[1] A rotating electrical machine 1 including a stator 20 fixed to an inner peripheral wall 40A of a case 40, and a rotor 30 fixed to the rotating shaft 10 and rotating inside the stator 20, and the rotating shaft 10 The cooling fan 50 further includes a plurality of blades 55 opposed to the outer peripheral wall 40B of the case 40. The cooling fan 50 rotates to rotate the blades 55 to supply the cooling air to the outer peripheral wall 40B. It was set as the structure sent to.

  Based on the above configuration, when the rotating electrical machine 1 is operated, the cooling fan 50 is rotationally driven by the rotating shaft 10, and the cooling air is directly applied to the outer peripheral wall 40 </ b> B of the case 40 in which the stator 20 is disposed by the blade 55. The stator 20 can be efficiently cooled by the cooling fan 50.

  [2] The cooling fan 50 includes a disk portion 52 connected to the rotating shaft 10, and a cylindrical portion 53 extending from the disk portion 52 in the axial direction of the rotating shaft 10 and having a blade 55. An opening (second outlet 56) is provided, the disc portion 52 is disposed with a gap (disc-shaped flow path 62) between the end wall 40C of the case 40, and the cylindrical portion 53 is connected to the outer peripheral wall 40B of the case 40. It is set as the structure arrange | positioned with a gap | interval (cylindrical flow path 61) between.

  Based on the above configuration, the cooling air sent to the inside of the cylindrical portion 53 by the blade 55 strikes the outer peripheral wall 40B disposed around the stator 20 and then is shunted in the both end directions of the stator 20, whereby the stator 20. The central part of the stator is sufficiently cooled, and the stator 20 can be cooled uniformly.

  [3] The length L1 of the blade 55 is set to be not less than the length L2 of the stator 20 in the axial direction of the rotary shaft 10.

  Based on the above configuration, the cooling air sent to the inside of the cylindrical portion 53 by the blade 55 hits the entire outer peripheral wall 40B arranged around the stator 20 in the axial direction, whereby the stator 20 is sufficiently cooled.

  The present invention is not limited to the above-described embodiment, and it is obvious that various modifications can be made within the scope of the technical idea.

DESCRIPTION OF SYMBOLS 1 Rotating electrical machine 10 Rotating shaft 20 Stator 30 Rotor 40 Case 40A Case inner peripheral wall (inner peripheral wall)
40B Case outer wall (outer wall)
40C Case end wall (end wall)
50 Cooling fan 52 Disk part 53 Cylindrical part 53C Open end 55 Blade 56 Second outlet (opening part)
61 Cylindrical channel (gap)
62 Disc-shaped channel (gap)

Claims (3)

A stator fixed to the inner peripheral wall of the case;
A rotating electric machine comprising a rotor fixed to a rotating shaft and rotating inside the stator,
A cooling fan that is rotationally driven by the rotary shaft;
The cooling fan includes a fan body that is connected to the rotating shaft, a fan opening portion that is opened in the fan body, a plurality of blades facing the outer peripheral wall of the case extending to the fan opening, the ,
The rotating electric machine according to claim 1, wherein the blade sends cooling air from the outside to the inside of the blade toward the outer peripheral wall through the fan opening as the cooling fan rotates. The cooling fan is
A disk portion coupled to the rotating shaft;
The cylindrical portion extends from the disk portion in the axial direction of the rotating shaft and has the blade,
An opening is provided in the disk part, the disk part is arranged with a gap between the end wall of the case, and the cylindrical part is arranged with a gap between the outer peripheral wall of the case. The rotating electrical machine according to claim 1.   3. The rotating electrical machine according to claim 1, wherein a length of the blade is set to be equal to or longer than a length of the stator in an axial direction of the rotating shaft.

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