JP2023167814A - Rotary electric machine - Google Patents

Abstract

To reduce mechanical loss and improve efficiency of a centrifugal fan installed in a rotary electric machine.SOLUTION: A centrifugal fan has a main plate that is formed in the shape of an abbreviated disk and has a plurality of notches formed at equal intervals in the circumferential direction on the outer peripheral part, and a plurality of blades provided one each between the notches in the outer peripheral part of the main plate. The blades have a configuration in which a first part including an inflow part located at an end of the main plate near the center and a second part including an outflow part located at an end of the main plate far from the center are connected. The inflow part is located on the front side with respect to the rotational direction of the main plate, and the outflow part is located on the rear side with respect to the rotational direction of the main plate. The first and second parts are provided so that an inflow angle at the inflow part is smaller than an outflow angle at the outflow part and a circumferential component of a relative flow velocity at the inflow part is large enough to cancel the circumferential flow velocity at the inflow part when the main plate is rotated in the rotational direction.SELECTED DRAWING: Figure 2

Description

The present invention relates to a rotating electric machine such as a generator, and particularly to one in which a centrifugal fan is provided in the rotor.

Rotating electrical machines such as DC machines, synchronous machines, and induction machines are structurally composed of a stator and rotor, and functionally utilize the principle of electromagnetic induction to mutually convert electrical energy and mechanical energy (rotational energy). It is something to do. In this rotating electric machine, the stator and rotor generate heat due to copper loss and iron loss, so cooling is required for normal operation. For this reason, in conventional rotating electric machines, for example, a centrifugal fan is attached to the rotating shaft, and cooling is performed using air generated from the centrifugal fan as the rotor rotates.

An example of the configuration of a conventional rotating electrical machine will be described with reference to FIGS. 7 and 8. FIG. 7 is a cross-sectional view showing the configuration of a conventional rotating electric machine, and FIG. 8 is a cross-sectional view of a centrifugal fan 8 provided in the conventional rotating electric machine. As shown in FIG. 7, the rotating electrical machine mainly includes a stator 1, a rotor 2, and a bearing 5 that supports the rotor 2.

The stator 1 consists of a stator core 1a made of donut-shaped (annular) electromagnetic steel sheets laminated in the axial direction (left-right direction in FIG. 7), and a stator winding 1b housed in slots on the inner diameter side of the stator core 1a. configured. The rotor 2 is arranged with a gap in the radial direction from the inner diameter surface of the stator 1, and is rotatable with respect to the stator 1. This rotor 2 is composed of a rotating shaft 3 and magnetic poles 4, and is rotatably supported by a bearing 5. The magnetic pole 4 has a structure in which a rotor winding 4b is wound around a rotor core 4a in which electromagnetic steel sheets are laminated in the axial direction. A centrifugal fan 8 is attached to the coupling 6 side, which is one end side of the rotating shaft 3. The coupling 6 is fastened with a bolt 7 to a coupling on the other side (a prime mover or a load), which is not shown.

The centrifugal fan 8 includes a main plate 9, a sub-plate 10, and blades 11 provided between the main plate 9 and the sub-plate 10. The main plate 9 is a substantially disk-shaped member fixed to the rotating shaft 3, and the sub-plate 10 is a ring-shaped member having an outer diameter comparable to that of the main plate 9. A blade 11 is provided so as to be sandwiched between.

Further, as shown in FIG. 8, a plurality of notches 12 are formed in the outer peripheral portion of the main plate 9 at regular intervals in the circumferential direction (that is, at equal intervals). Note that FIG. 8 shows a cross section of a portion (semicircular portion) of the approximately disk-shaped main plate 9 and the blade 11 provided on the portion of the main plate 9. The notch 12 provided on the outer periphery of the main plate 9 is for access from the centrifugal fan 8 side when the coupling 6 and the mating coupling are fastened with the bolts 7, and is for assembly and maintenance purposes. It is necessary.

The blades 11 are formed by crushing a pipe to have a straight cross section, and are provided in plurality on the outer peripheral portion of the main plate 9 at regular intervals in the circumferential direction (that is, at equal intervals). In other words, one of the plurality of blades 11 is provided between each of the notches 12 formed in the outer peripheral portion of the main plate 9 .

The blade 11 has one end, which is closer to the center of the main plate 9, as a wind inlet 11i, and the other end, which is farther from the center of the main plate 9, as a wind outlet 11o. The outflow portion 11o is located at the front side (that is, the downstream side in the rotational direction) with respect to the rotational direction Ar1, and the outflow portion 11o is located on the rear side (that is, the upstream side in the rotational direction) with respect to the rotational direction Ar1, and both the inflow angle θi and the outflow angle θo are 75 degrees. It is attached by welding in the same direction. The inflow angle θi is the angle between the center line L0 of the blade 11 in the thickness direction and a vector in the opposite direction to the rotation direction Ar1 of the centrifugal fan 8 at the end of the blade 11 on the inflow portion 11i side. On the other hand, the outflow angle θo is the angle formed by the center line L0 of the blade 11 in the thickness direction at the end of the blade 11 on the outflow portion 11o side and a vector that is exactly opposite to the rotation direction Ar1 of the centrifugal fan 8.

By the way, when the centrifugal fan 8 rotates in the rotational direction Ar1, a circumferential flow velocity 20 is generated in the inlet portion 11i of the blade 11 due to the rotation, as shown in FIG. Losses increase, resulting in a centrifugal fan with low efficiency. In order to reduce the loss in the inflow part 11i of the blade 11, the blade 11 is laid down (i.e., It is necessary to reduce the inflow angle θi) and cancel the circumferential flow velocity 20 by the circumferential component 22 in the opposite direction to the circumferential flow velocity 20 to zero.

However, in reality, if the blades 11 are laid down, the blades 11 will interfere with the notches 12 of the main plate 9, so this cannot be realized. Further, when the blades 11 are laid down, the outflow angle θo becomes smaller, and the pressure at the outflow portion 11o becomes smaller, so there is also a disadvantage that the air volume becomes smaller.

As a conventional technique related to a centrifugal fan for a rotating electrical machine, there is a technique shown in Patent Document 1, for example.

Japanese Unexamined Patent Publication No. 15652/1983

The centrifugal fan described in Patent Document 1 improves cooling performance at low rotation speeds and quietness at high rotation speeds by forming blades in an arc shape. However, simply making the blades arc-shaped will not cancel out the circumferential flow velocity due to rotation at the inflow section of the blades, as is the case with straight blades, which will increase mechanical loss and result in a centrifugal fan with low efficiency. I end up.

In this way, in conventional centrifugal fans installed in rotating electric machines, the notches formed in the main plate restrict the placement of the blades, and the circumferential flow velocity due to rotation occurs at the inflow section of the blades, resulting in mechanical damage. There was a problem in that the amount of energy increased, resulting in low efficiency.

The present invention has been made to solve the above problems, and aims to reduce mechanical loss and improve efficiency of a centrifugal fan provided in a rotating electric machine.

In order to achieve the above object, a rotating electric machine according to the present invention includes: an annular stator; a rotor provided inside the stator and rotatable with respect to the stator; and a rotor attached to a rotating shaft of the rotor. The centrifugal fan includes a main plate formed in a substantially disk shape and having a plurality of notches formed at equal intervals in the circumferential direction on the outer circumferential portion, and notches on the outer circumferential portion of the main plate. and a plurality of blades provided one each between the main plate and the notch, and the blade includes a first portion including an inflow portion located at an end near the center of the main plate; A second part including an outflow part located at an end far from the center is connected to the second part, the inflow part being on the front side with respect to the rotation direction of the main plate, and the outflow part being on the front side with respect to the rotation direction of the main plate. The inflow angle at the inflow section is smaller than the outflow angle at the outflow section, and the circumferential component of the relative flow velocity at the inflow section when the main plate rotates in the rotational direction is the circumferential direction at the inflow section. The first portion and the second portion are provided to have a size that cancels out the directional flow velocity.

According to the present invention, the mechanical loss of the centrifugal fan is reduced by providing the first portion of the blade such that the inflow angle is such that the circumferential component of the relative flow velocity in the inflow portion cancels out the circumferential flow velocity in the inflow portion. can be reduced and efficiency improved. Furthermore, since the outflow angle can be made larger than the inflow angle by the second portion, the efficiency can be improved while maintaining the air volume of the centrifugal fan.

FIG. 1 is a sectional view of a rotating electric machine according to a first embodiment. 1 is a sectional view of a centrifugal fan according to a first embodiment. FIG. 3 is a diagram showing the relationship between relative flow velocity and circumferential flow velocity in the inflow section of the centrifugal fan according to the first embodiment. FIG. 3 is a sectional view of a centrifugal fan according to a second embodiment. FIG. 7 is a sectional view of a centrifugal fan according to a third embodiment. It is a sectional view of the centrifugal fan concerning a 4th embodiment. FIG. 2 is a cross-sectional view of a conventional rotating electric machine. FIG. 2 is a sectional view of a conventional centrifugal fan. It is a figure which shows the relationship between the relative flow velocity and the circumferential direction flow velocity in the inflow part of the conventional centrifugal fan.

Embodiments of the present invention will be described below with reference to the drawings.

[1. First embodiment]
First, a first embodiment of the present invention will be described. FIG. 1 is a sectional view showing a configuration example of a rotating electrical machine according to a first embodiment of the present invention. Note that FIG. 1 is a diagram corresponding to FIG. 7, and among the components of the rotating electrical machine according to the first embodiment shown in FIG. Components will be given the same reference numerals and detailed explanations will be omitted as appropriate.

The rotating electric machine according to the first embodiment mainly includes a stator 1, a rotor 2, and a bearing 5 that supports the rotor 2. The stator 1 consists of a stator core 1a made of donut-shaped (annular) electromagnetic steel sheets laminated in the axial direction (left-right direction in FIG. 1), and a stator winding 1b housed in slots on the inner diameter side of the stator core 1a. configured. The rotor 2 is arranged with a gap in the radial direction from the inner diameter surface of the stator 1, and is rotatable with respect to the stator 1. This rotor 2 is composed of a rotating shaft 3 and magnetic poles 4, and is rotatably supported by a bearing 5. The magnetic pole 4 has a structure in which a rotor winding 4b is wound around a rotor core 4a in which electromagnetic steel sheets are laminated in the axial direction. A centrifugal fan 50 is attached to the coupling 6 side, which is one end side of the rotating shaft 3. The coupling 6 is fastened with a bolt 7 to a coupling on the other side (a prime mover or a load), which is not shown.

The centrifugal fan 50 includes a main plate 9, a sub-plate 10, and blades 60 provided between the main plate 9 and the sub-plate 10. The main plate 9 is a substantially disk-shaped member fixed to the rotating shaft 3, and the sub-plate 10 is a ring-shaped member having an outer diameter comparable to that of the main plate 9. A blade 60 is provided so as to be sandwiched between.

Further, as shown in FIG. 2, a plurality of notches 12 are formed in the outer peripheral portion of the main plate 9 at regular intervals in the circumferential direction (that is, at equal intervals). Note that FIG. 2 is a diagram corresponding to FIG. 9, and shows a portion (semicircular portion) of the approximately disk-shaped main plate 9 and a cross section (perpendicular to the axial direction) of the blade 60 provided on the portion of the main plate 9. (cross section) is shown. The notch 12 provided on the outer periphery of the main plate 9 is for access from the centrifugal fan 50 side when the coupling 6 and the mating coupling are fastened with bolts 7, and is for assembly and maintenance purposes. It is necessary. Note that this notch 12 may be formed not only on the main plate 9 side but also on the sub-plate 10 side.

The blades 60 are formed by crushing a pipe to have an arcuate cross section, and are provided in plural on the outer circumference of the main plate 9 at regular intervals in the circumferential direction (that is, at equal intervals). In other words, one of the plurality of blades 60 is provided between each of the notches 12 formed in the outer peripheral portion of the main plate 9 .

The blade 60 has a first end including the inflow part 60i, with one end side near the center of the main plate 9 serving as a wind inflow part 60i, and the other end side far from the center of the main plate 9 serving as a wind outflow part 60o. It has a structure in which a portion 61 and a second portion 62 including an outflow portion 60o are connected. The first portion 61 and the second portion 62 each have an arcuate cross section. More specifically, the center line L1 in the thickness direction of the first portion 61 and the center line L2 in the thickness direction of the second portion 62 have the same curvature and the center rotates when viewed from the blade 60. It is a circular arc located on the front side in the direction Ar1, and the blade 60 as a whole has an arc-shaped cross section that expands toward the rear side in the rotation direction Ar1 (that is, in the opposite direction to the rotation direction Ar1).

The blade 60 is provided such that the inlet portion 60i is on the front side (that is, the downstream side in the rotational direction) with respect to the rotational direction Ar1, and the outflow portion 60o is on the rear side (that is, on the upstream side in the rotational direction) with respect to the rotational direction Ar1. There is. Furthermore, the outflow angle θo of the blades 60 is set to 75 degrees to obtain a sufficient air volume, similar to the conventional centrifugal fan 8 shown in FIG. On the other hand, regarding the inflow angle θi, as shown in FIG. 3, the circumferential direction component 22a of the relative flow velocity 21a in the inflow part 60i when the main plate 9 rotates in the rotation direction Ar1 cancels the circumferential flow velocity 20 in the inflow part 60i. (that is, the circumferential component 22a in the opposite direction to the circumferential flow velocity 20 has the same magnitude as the circumferential flow velocity 20).

That is, the blade 60 fits between the notches 12, the inflow angle θi is smaller than the outflow angle θo, and the circumferential direction component 22a of the relative flow velocity 21a in the inflow part 60i is the circumferential flow velocity 20 in the inflow part 60i. The size, orientation, position, curvature of the arc, etc. have been appropriately selected so that the size cancels out.

In this embodiment, the outflow angle θo is set to 75 degrees, but this is because it is desirable to make the outflow angle θo a large angle close to 90 degrees in order to obtain a sufficient air volume. Therefore, the outflow angle θo does not necessarily have to be 75 degrees, but may be about 70 degrees to 90 degrees. On the other hand, the inflow angle θi is only smaller than the outflow angle θo and does not indicate a specific angle; This is because the inflow angle θi at which the circumferential component 22 of the relative flow velocity 21 cancels the circumferential flow velocity 20 changes depending on the size of the notch 12, etc.

As described so far, the rotating electric machine according to the first embodiment includes an annular stator 1, a rotor 2 provided inside the stator 1 and rotatable with respect to the stator 1, and a rotor 2 that is rotatable with respect to the stator 1. A centrifugal fan 50 attached to the rotating shaft 3 of the child 2 is provided. Further, the centrifugal fan 50 includes a main plate 9 that is formed in a substantially disk shape and has a plurality of notches 12 formed at equal intervals in the circumferential direction on the outer circumference, and a plurality of cutouts 12 on the outer circumference of the main plate 9. and a plurality of blades 60, one provided between the two.

In addition, the blade 60 includes a first portion 61 having an arcuate cross section including an inflow portion 60i located at the end of the main plate 9 near the center, and an outflow portion 60o located at the end of the main plate 9 far from the center. It has an arcuate cross section connecting the first part 61 and the second part 62 which has an arcuate cross section with the same curvature, the inflow part 60i is on the front side with respect to the rotational direction Ar1 of the main plate 9, and the outflow part 60o is on the front side with respect to the rotational direction Ar1 of the main plate 9. When the inflow angle θi at the inflow part 60i is smaller than the outflow angle θo at the outflow part 60o and the main plate 9 rotates in the rotation direction Ar1, the relative flow velocity 21a at the inflow part 60i is on the rear side with respect to the rotation direction Ar1. The first portion 61 and the second portion 62 are provided so that the circumferential component 22a has a size that cancels out the circumferential flow velocity 20 in the inflow portion 60i.

In this way, in the rotating electric machine according to the first embodiment, the blades 60 are arranged such that the inflow angle θi is such that the circumferential direction component 22a of the relative flow velocity 21a in the inflow part 60i cancels out the circumferential direction flow velocity 20 in the inflow part 60i. By providing the first portion 61, mechanical loss of the centrifugal fan 50 can be reduced and efficiency can be improved. Furthermore, by providing the second portion 62 so that the outflow angle θo is larger than the inflow angle θi (a large angle close to 90 degrees), the efficiency is improved while maintaining the air volume of the centrifugal fan 50. be able to. Thus, according to the first embodiment, the mechanical loss of the centrifugal fan 50 provided in the rotating electric machine can be reduced and the efficiency can be improved.

[2. Second embodiment]
Next, a second embodiment of the present invention will be described. The second embodiment is an embodiment in which the shape of the blades provided in the centrifugal fan is different from that of the first embodiment. Therefore, mainly the shape of the blades provided in the centrifugal fan will be explained here. As shown in FIG. 4, which corresponds to FIG. 2, in the second embodiment, the blades 80 provided in the centrifugal fan 70 are formed by crushing a pipe to have a substantially arc-shaped cross section. A plurality of them are provided on the outer periphery of the main plate 9 at regular intervals (that is, at equal intervals) in the circumferential direction. In other words, one of the plurality of blades 80 is provided between each of the notches 12 formed in the outer peripheral portion of the main plate 9 .

The blade 80 has a first end including the inflow part 80i, with one end side near the center of the main plate 9 serving as a wind inflow part 80i, and the other end side far from the center of the main plate 9 serving as a wind outflow part 80o. It has a structure in which a portion 81 and a second portion 82 including an outflow portion 80o are connected. The first portion 81 has an arcuate cross section, while the second portion 82 has a straight cross section. More specifically, the center line L21 in the thickness direction of the first portion 81 is an arc whose center is located on the front side in the rotation direction Ar1 when viewed from the blade 80, while the center line L21 in the thickness direction of the second portion 82 The center line L22 is a straight line, and the blade 80 as a whole has a substantially arcuate cross section that bulges rearward in the rotation direction Ar1.

This blade 80 is provided such that the inlet portion 80i is on the front side with respect to the rotational direction Ar1 (that is, on the downstream side in the rotational direction), and the outflow portion 80o is on the rear side with respect to the rotational direction Ar1 (that is, on the upstream side in the rotational direction). There is. Furthermore, the outflow angle θo of the blade 80 is set to 75 degrees, which allows a sufficient amount of airflow to be obtained, as in the first embodiment. On the other hand, regarding the inflow angle θi, as shown in FIG. 3, as in the first embodiment, the circumferential component 22a of the relative flow velocity 21a in the inflow portion 80i cancels out the circumferential flow velocity 20 in the inflow portion 80i. (In other words, the circumferential component 22a in the opposite direction to the circumferential flow velocity 20 has the same magnitude as the circumferential flow velocity 20).

That is, like the first embodiment, the blade 80 fits between the notches 12, the inflow angle θi is smaller than the outflow angle θo, and the circumferential direction component 22a of the relative flow velocity 21a in the inflow portion 80i The size (length of the first portion 81 and second portion 82, etc.), orientation, position, curvature of the arc, etc. are appropriately selected so that It has become a thing.

In this way, in the second embodiment, the blade 80 has a configuration in which the first portion 81 having an arcuate cross-section and the second portion 82 having a straight cross-section are connected. The same inflow angle θi and outflow angle θo as the blade 60 having a configuration in which the first part 61 and the second part 62 are connected are realized.

As described so far, the rotating electric machine according to the second embodiment includes the centrifugal fan 70, which is formed into a substantially disk shape and is formed at equal intervals in the circumferential direction on the outer circumferential portion. It has a main plate 9 having a plurality of notches 12, and a plurality of blades 80 provided one each between the notches 12 in the outer peripheral portion of the main plate 9.

In addition, the blade 80 has a substantially arcuate cross section connecting a first portion 81 including an inflow portion 80i and having an arcuate cross section, and a second portion 82 including an outflow portion 80o and having a linear cross section. is on the front side with respect to the rotational direction Ar1 of the main plate 9, and the outflow part 80o is on the rear side with respect to the rotational direction Ar1 of the main plate 9, and the inflow angle θi at the inflow part 80i is smaller than the outflow angle θo at the outflow part 80o, and the main plate The first portion 81 and the second portion 82 are arranged so that the circumferential direction component 22a of the relative flow velocity 21a in the inflow portion 80i when the rotation direction Ar1 is rotated in the rotation direction Ar1 is such that the circumferential direction component 22a of the relative flow velocity 21a in the inflow portion 80i cancels out the circumferential direction flow velocity 20 in the inflow portion 80i. I thought it was set up.

By doing this, in the rotating electric machine according to the second embodiment, the same inflow angle θi and outflow angle θo as in the first embodiment can be realized in the blade 80, and the same inflow angle θi and outflow angle θo as in the first embodiment can be realized. Similarly, while maintaining the air volume of the centrifugal fan 70, mechanical loss can be reduced and efficiency can be improved.

[3. Third embodiment]
Next, a third embodiment of the present invention will be described. The third embodiment is an embodiment in which the shape of the blades provided in the centrifugal fan is different from the first and second embodiments. Therefore, mainly the shape of the blades provided in the centrifugal fan will be explained here. As shown in FIG. 5, which corresponds to FIG. 2, in the third embodiment, the blades 100 provided in the centrifugal fan 90 are formed by crushing a pipe to have a substantially arcuate cross section. A plurality of them are provided on the outer periphery of the main plate 9 at regular intervals (that is, at equal intervals) in the circumferential direction. In other words, one of the plurality of blades 100 is provided between each of the notches 12 formed in the outer peripheral portion of the main plate 9 .

The blade 100 has a first end including the inflow part 100i, with one end side near the center of the main plate 9 serving as a wind inflow part 100i, and the other end side far from the center of the main plate 9 serving as a wind outflow part 100o. It has a configuration in which a portion 101 and a second portion 102 including an outflow portion 100o are connected. The first portion 101 has an arcuate cross section, while the second portion 102 has an arcuate cross section with a different curvature from that of the first portion 101 . More specifically, the center line L31 in the thickness direction of the first portion 101 is an arc whose center is located on the front side in the rotation direction Ar1 when viewed from the blade 100, while the thickness of the second portion 102 The center line L32 in the direction is a circular arc whose center is located on the front side in the rotation direction Ar1 when viewed from the blade 80, and has a smaller curvature (that is, a gentler bend) than the first portion 101, and is a circular arc whose center is located on the front side in the rotation direction Ar1 when viewed from the blade 80. The cross section has a substantially arcuate shape that swells toward the rear side in the rotation direction Ar1.

This blade 100 is provided such that the inlet portion 100i is on the front side (that is, the downstream side in the rotational direction) with respect to the rotational direction Ar1, and the outflow portion 100o is on the rear side (that is, on the upstream side in the rotational direction) with respect to the rotational direction Ar1. There is. Further, in this blade 100, the outflow angle θo is set to 75 degrees, which allows a sufficient amount of airflow to be obtained, as in the first embodiment. On the other hand, as for the inflow angle θi, as shown in FIG. 3, as in the first embodiment, the circumferential component 22a of the relative flow velocity 21a in the inflow portion 100i cancels out the circumferential flow velocity 20 in the inflow portion 100i. (In other words, the circumferential component 22a in the opposite direction to the circumferential flow velocity 20 has the same magnitude as the circumferential flow velocity 20).

That is, like the first embodiment, the blade 100 fits between the notches 12, the inflow angle θi is smaller than the outflow angle θo, and the circumferential direction component 22a of the relative flow velocity 21a at the inflow portion 100i The size (length of the first portion 101 and the second portion 102, etc.), direction, position, curvature of the arc, etc. are appropriately selected so that It has become a thing.

In this way, in the third embodiment, the blade 100 has a configuration in which the first portion 101 having an arcuate cross-section and the second portion 102 having an arcuate cross-section having a different curvature from the first portion 101 are connected. By doing so, the same inflow angle θi and outflow angle θo as in the blade 60 having a configuration in which the first portion 61 having an arcuate cross-section and the second portion 62 having an arcuate cross-section having the same curvature as the first portion 61 are connected. has been realized.

As described so far, the rotating electric machine according to the third embodiment includes the centrifugal fan 90, which is formed into a substantially disk shape and formed at equal intervals in the circumferential direction on the outer circumferential portion. It has a main plate 9 having a plurality of notches 12, and a plurality of blades 100 provided one each between the notches 12 in the outer peripheral portion of the main plate 9.

In addition, the blade 100 connects a first portion 101 that includes an inlet portion 100i and has an arcuate cross section, and a second portion 102 that includes an outlet portion 100o and has an arcuate cross section that has a different curvature from the first portion 101. The cross section is approximately arcuate, the inflow part 100i is on the front side with respect to the rotation direction Ar1 of the main plate 9, the outflow part 100o is on the rear side with respect to the rotation direction Ar1 of the main plate 9, and the inflow angle θi in the inflow part 100i is the same as that of the outflow part. 100o and so that the circumferential direction component 22a of the relative flow velocity 21a in the inflow part 100i when the main plate 9 rotates in the rotation direction Ar1 cancels out the circumferential flow velocity 20 in the inflow part 100i. It is assumed that a portion 101 and a second portion 102 are provided.

By doing this, in the rotating electrical machine according to the third embodiment, the same inflow angle θi and outflow angle θo as in the first embodiment can be realized in the blade 100, and the same inflow angle θi and outflow angle θo as in the first embodiment can be realized. Similarly, while maintaining the air volume of the centrifugal fan 90, mechanical loss can be reduced and efficiency can be improved.

[4. Fourth embodiment]
Next, a fourth embodiment of the present invention will be described. The fourth embodiment is an embodiment in which the shape of the blades provided in the centrifugal fan is different from the first to third embodiments. Therefore, mainly the shape of the blades provided in the centrifugal fan will be explained here. As shown in FIG. 6, which corresponds to FIG. 2, in the fourth embodiment, the blades 120 provided in the centrifugal fan 110 are formed by crushing a pipe to have a substantially arc-shaped cross section. A plurality of them are provided on the outer periphery of the main plate 9 at regular intervals (that is, at equal intervals) in the circumferential direction. In other words, one of the plurality of blades 120 is provided between each of the notches 12 formed in the outer peripheral portion of the main plate 9 .

The blade 120 has a first end including the inflow part 120i, with one end side near the center of the main plate 9 serving as a wind inflow part 120i, and the other end side far from the center of the main plate 9 serving as a wind outflow part 120o. It has a configuration in which a portion 121 and a second portion 122 including an outflow portion 120o are connected. The first portion 121 has an arcuate cross section, while the second portion 122 has an arcuate cross section in the opposite direction to the first portion 121. More specifically, the center line L41 in the thickness direction of the first portion 121 is an arc whose center is located on the rear side in the rotation direction Ar1 when viewed from the blade 120, while the center line L41 in the thickness direction of the first portion 121 The center line L42 in the horizontal direction is a circular arc whose center is located on the front side in the rotation direction Ar1 when viewed from the blade 120, and the blade 120 as a whole has a substantially arc-shaped cross section that swells toward the rear side in the rotation direction Ar1.

This blade 120 is provided such that the inlet portion 120i is on the front side (that is, the downstream side in the rotational direction) with respect to the rotational direction Ar1, and the outflow portion 120o is on the rear side (that is, on the upstream side in the rotational direction) with respect to the rotational direction Ar1. There is. Furthermore, the outflow angle θo of this blade 120 is set to 75 degrees, which allows a sufficient amount of airflow to be obtained, as in the first embodiment. On the other hand, as for the inflow angle θi, as in the first embodiment, as shown in FIG. (In other words, the circumferential component 22a in the opposite direction to the circumferential flow velocity 20 has the same magnitude as the circumferential flow velocity 20).

That is, the blade 120 fits between the notches 12 as in the first embodiment, the inflow angle θi is smaller than the outflow angle θo, and the circumferential direction component 22a of the relative flow velocity 21a in the inflow portion 120i The size (such as the length of the first portion 121 and the second portion 122), direction, position, curvature of the arc, etc. are appropriately selected so that It has become a thing.

In this way, in the fourth embodiment, the blade 120 connects the first portion 121 having an arc-shaped cross section and the second portion 122 having an arc-shaped cross section in the opposite direction to the first portion 121. With this configuration, the inflow angle θi is similar to that of the blade 60 having a configuration in which the first portion 61 having an arcuate cross section and the second portion 62 having an arcuate cross section along the same direction as the first portion 61 are connected. and outflow angle θo.

As described so far, the rotating electric machine according to the fourth embodiment includes the centrifugal fan 110, which is formed into a substantially disk shape and formed at equal intervals in the circumferential direction on the outer periphery. It has a main plate 9 having a plurality of notches 12, and a plurality of blades 120 provided one each between the notches 12 in the outer peripheral portion of the main plate 9.

In addition, the blade 120 includes a first portion 121 that includes an inlet portion 120i and has an arcuate cross section, and a second portion 122 that includes an outlet portion 120o and has an arcuate cross section that runs in the opposite direction to the first portion 121. The connected cross-sections are approximately arc-shaped, the inflow portion 120i is on the front side with respect to the rotational direction Ar1 of the main plate 9, the outflow portion 120o is on the rear side with respect to the rotational direction Ar1 of the main plate 9, and the inflow angle θi at the inflow portion 120i is The circumferential direction component 22a of the relative flow velocity 21a in the inflow part 120i is smaller than the outflow angle θo in the outflow part 120o and is large enough to cancel out the circumferential flow velocity 20 in the inflow part 120i when the main plate 9 rotates in the rotation direction Ar1. It is assumed that a first portion 121 and a second portion 122 are provided.

By doing this, in the rotating electric machine according to the fourth embodiment, the same inflow angle θi and outflow angle θo as in the first embodiment can be realized in the blade 120, and the same inflow angle θi and outflow angle θo as in the first embodiment can be realized. Similarly, while maintaining the air volume of the centrifugal fan 110, mechanical loss can be reduced and efficiency can be improved.

Further, in the second embodiment described above, the blade 80 has a configuration in which the first portion 81 having an arcuate cross section and the second portion 82 having a straight cross section are connected, and in the third embodiment, the blade 80 100 has a configuration in which a first portion 101 having an arcuate cross-section and a second portion 102 having an arcuate cross-section having a different curvature from the first portion 101 are connected, and in the fourth embodiment, the blade 120 is , a first portion 121 having an arcuate cross section and a second portion 122 having an arcuate cross section extending in the opposite direction to the first portion 121 are connected. In this way, in the blades 80, 100, 120, the first part (81, 101, 121) and the second part (82, 102, 122) have different shapes. Compared to the blade 60 of the embodiment, there is a high degree of freedom in arrangement and size. For this reason, for example, if the space between the notches 12 is narrow and the blade 60 cannot be placed in the space, the blade 60 can be placed by using one of the blades 80, 100, and 120. There is. That is, by selecting an appropriate blade among the blades 60, 80, 100, and 120, it becomes possible to correspond to various main plates 9.

[5. Other embodiments]
Next, other embodiments (modifications) of the present invention will be described. In the second embodiment described above, the blade 80 has a first portion 81 having an arcuate cross-section and a second portion 82 having a straight cross-section, so that the blade 80 has a substantially arcuate cross-section as a whole. However, the present invention is not limited to this, and the first portion 81 may have a linear cross section, the second portion 82 may have a circular arc cross section, and the blade 80 as a whole may have a substantially arc cross section. In this case as well, the blade 80 fits between the notches 12, the inflow angle θi is smaller than the outflow angle θo, and the circumferential component 22a of the relative flow velocity 21a at the inflow portion 80i is The size (such as the length of the first portion 81 and the second portion 82), direction, position, curvature of the arc, etc. may be appropriately selected so as to cancel the directional flow velocity 20.

Further, the present invention is not limited to this, and for example, the first portion 81 may have a linear cross section, the second portion 82 may also have a linear cross section, and the blade 80 as a whole may have a substantially arcuate cross section. Further, the present invention is not limited to this, and for example, by adding a portion having a straight cross section or a circular arc cross section between the first portion 81 and the second portion 82 having a straight cross section, the blade 80 as a whole may have a substantially circular arc cross section. You may also do this. In these cases as well, the blade 80 fits between the notches 12, the inflow angle θi is smaller than the outflow angle θo, and the circumferential component 22a of the relative flow velocity 21a at the inflow portion 80i is smaller than the outflow angle θo. The size (such as the length of the first portion 81 and the second portion 82), direction, position, curvature of the arc, etc. may be appropriately selected so as to cancel out the circumferential flow velocity 20.

Furthermore, in the fourth embodiment described above, the blade 120 is connected to a first portion 121 having an arcuate cross-section and a second portion 122 having an arcuate cross-section in the opposite direction to the first portion 121, The overall cross section was approximately arc-shaped. The present invention is not limited to this, and the warping directions of the first portion 121 and the second portion 122 may be opposite to each other. That is, the center line L41 in the thickness direction of the first portion 121 is an arc whose center is located on the front side in the rotation direction Ar1 when viewed from the blade 120, and the center line L42 in the thickness direction of the second portion 122 is, It may be a circular arc whose center is located on the rear side in the rotation direction Ar1 when viewed from the blade 120. In this case as well, the blade 120 fits between the notches 12, the inflow angle θi is smaller than the outflow angle θo, and the circumferential component 22a of the relative flow velocity 21a at the inflow portion 120i is The size (such as the length of the first portion 121 and the second portion 122), direction, position, curvature of the arc, etc. may be appropriately selected so as to cancel the directional flow velocity 20.

Furthermore, the present invention is not limited to this, and the blade may be formed into a substantially arc-shaped cross section by combining a linear section, an arc-shaped section, and an arc-shaped section running in the opposite direction to the section. good.

Further, in the first to fourth embodiments described above, the present invention is applied to a rotating electric machine having a synchronous machine generator configuration. The present invention is not limited to this, and the present invention may be applied to a rotating electrical machine having a configuration different from that of the first to fourth embodiments described above, as long as the rotating electrical machine has a configuration including a centrifugal fan having a notch. good.

Furthermore, the present invention is not limited to the embodiments described above. In other words, the scope of the present invention extends to embodiments that arbitrarily combine part or all of the first to fourth embodiments and other embodiments, as well as embodiments that extract some of them. It is something that is covered.

INDUSTRIAL APPLICABILITY The present invention can be widely used in rotating electric machines such as synchronous generators equipped with centrifugal fans.

1... Stator, 2... Rotor, 3... Rotating shaft, 4... Magnetic pole, 5... Bearing, 6... Coupling, 7... Bolt, 8, 50, 70, 90, 110... Centrifugal fan, 9...Main plate, 10...Subplate, 11, 60, 80, 100, 120...Blade, 11i, 60i, 80i, 100i, 120i...Inflow section, 11o, 60o, 80o, 100o, 120o ...Outflow portion, 12...Notch, 20...Circumferential flow velocity, 21, 21a...Relative flow velocity, 22, 22a...Circumferential direction component, Ar1...Rotation direction, L1, L2, L21, L22, L31 , L32, L41, L42...center line, θi...inflow angle, θo...outflow angle.

In order to achieve the above object, a rotating electric machine according to the present invention includes: an annular stator; a rotor provided inside the stator and rotatable with respect to the stator; and one end of a rotating shaft of the rotor. a coupling attached to the rotating shaft, and a centrifugal fan attached to the coupling side of the rotating shaft, and the centrifugal fan is formed in a substantially disk shape, and has grooves arranged at equal intervals in the circumferential direction on the outer periphery. a main plate formed with a plurality of notches for access when fastening the coupling and a mating coupling ; and a portion between the notches in an outer peripheral portion of the main plate. a plurality of blades provided one each at a position away from the edge of the notch , and the blade includes a first portion including an inflow portion located at an end on a side closer to the center of the main plate. and a second part including an outflow part located at an end on the side far from the center of the main plate, the inflow part being on the front side in the rotational direction of the main plate, The outflow part is on the rear side in the rotational direction of the main plate, and the inflow angle at the inflow part is smaller than the outflow angle at the outflow part, and when the main plate rotates in the rotational direction. The first portion and the second portion are provided such that the circumferential component of the relative flow velocity in the inflow portion cancels out the circumferential flow velocity in the inflow portion, and further, the portion between the notches of the main plate is The blade has a substantially rectangular shape when viewed from the axial direction of the rotating shaft, and the blades extend from a corner side located on the rear side in the rotational direction of the outer periphery of the main plate in the portion between the notches to the front side in the rotational direction of the portion between the notches. and the center of the main plate .

Claims (5)

an annular stator;
a rotor provided inside the stator and rotatable with respect to the stator;
a centrifugal fan attached to the rotating shaft of the rotor;
The centrifugal fan is
a main plate formed in a substantially disk shape and having a plurality of notches formed at equal intervals in the circumferential direction on the outer peripheral portion;
a plurality of blades provided one each between a notch in the outer peripheral portion of the main plate and between the notches;
The blade is
A first part including an inflow part located at an end of the main plate near the center and a second part including an outflow part located at an end far from the center of the main plate are connected, The inflow part is on the front side with respect to the rotation direction of the main plate, and the outflow part is on the rear side with respect to the rotation direction of the main plate, and the inflow angle at the inflow part is smaller than the outflow angle at the outflow part and the main plate The first portion and the second portion are provided such that a circumferential component of the relative flow velocity in the inflow portion when rotated in the rotational direction has a size that cancels out the circumferential flow velocity in the inflow portion. A rotating electric machine characterized by: The first portion has an arcuate cross section,
The second portion has an arcuate cross section with the same curvature as the first portion,
The rotating electric machine according to claim 1, wherein the blade has an arcuate cross section that swells in a direction opposite to the rotational direction as a whole. The first portion has an arcuate cross section,
The second portion has a straight cross section,
The rotating electric machine according to claim 1, wherein the blade has a generally arcuate cross section that swells in a direction opposite to the rotational direction. The first portion has an arcuate cross section,
The second portion has an arcuate cross section with a different curvature from the first portion,
The rotating electric machine according to claim 1, wherein the blade has a generally arcuate cross section that swells in a direction opposite to the rotational direction. The first portion has an arcuate cross section,
The second portion has an arcuate cross section curved in a direction opposite to that of the first portion,
The rotating electric machine according to claim 1, wherein the blade has a generally arcuate cross section that swells in a direction opposite to the rotational direction.

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