JP7031386B2 - Rotating machine - Google Patents

Description

The present invention relates to a rotary electric machine such as a generator or an electric motor.

When a rotating electric machine such as a generator or a motor is operated, the inside of the stator, the winding part such as the coil end, the magnet part of the rotor, etc. generate heat, so it is fixed by the rotation of the blower fan attached to the rotating shaft. Air is supplied to the gap between the coil ends of the child to cool the coil end, and air is supplied to the gap between the stator and the rotor to communicate with the gap and the stator duct. The magnet portion of the rotor and the winding portion inside the stator are cooled (see, for example, Patent Document 1 below).

Japanese Unexamined Patent Publication No. 2010-035319

In the rotary electric machine as described above, since the size of the gap between the stator and the rotor is smaller than the size of the gap at the coil end, the air supplied by the blower fan is larger than the gap. However, it was difficult to flow into the gap, and the cooling efficiency of the magnet portion of the rotor and the winding portion inside the stator was low.

Therefore, for example, by coaxially attaching an annular shroud to the blower fan so as to connect between the radial outer edges of the plurality of blades of the blower fan, the air supply direction is given directivity. Although it is conceivable to make it easier for air to flow through the gap, since the blower fan rotates fairly quickly (1500 to 1800 rpm at a commercial frequency of 50 to 60 Hz), if the rotary electric machine is large, the radial direction of the blower fan blades Since a large amount of stress is applied to the joint portion between the outer edge portion and the shroud, excessive strength is required for the joint portion, which is not realistic.

Therefore, it is an object of the present invention to provide a rotary electric machine capable of efficiently supplying air to a gap between a stator and a rotor even if the size is large.

In order to solve the above-mentioned problems, the rotary electric machine according to the present invention has an internal hollow frame, a stator having a cylindrical shape supported by the frame and projecting coil ends from both ends, and the stator. A rotating shaft that penetrates the inside of the child and is rotatably supported with respect to the frame, and a ventilation duct that is attached to the rotating shaft so as to be located between the rotating shaft and the stator and passes through the inside. It is equipped with a cylindrical rotor that does not have, and a propeller-shaped blower fan that is mounted coaxially with the rotating shaft so as to be located radially inside the stator of the coil end of the stator. In the rotary electric machine, the stator of the coil end of the stator is opposed to the radially outer end of the blower fan so as to cover the radial outer side of the blower fan. An annular guide ring attached to the inside in the radial direction is provided, and the guide ring is formed with a plurality of through holes penetrating along the axial direction along the circumferential direction, and a binding cord is formed in the through holes. It is characterized in that it is inserted and fastened to the coil end only by the binding cord .

Further, the rotary electric machine according to the present invention is a trapezoidal type in which the outer peripheral surface of the rotary electric machine is inclined in a tapered shape so that the guide ring is thicker on the outer side in the axial direction than on the inner side in the axial direction of the stator. It is characterized in that it has an axial cross-sectional shape of.

According to the rotary electric machine according to the present invention, even if the blower fan rotates at a considerably high speed, a large amount of stress is not applied to the blades and the guide ring of the blower fan, and the axial direction of the rotating shaft with respect to the air taken into the blower fan. Since the air can be sent out by giving the directional direction along the above, a large amount of the air can flow into the gap between the stator and the rotor, so that even if the size is large, the air can be sent to the gap. Efficient feeding can be easily done.

It is a schematic block diagram of the main embodiment of the rotary electric machine which concerns on this invention. It is an external view of the guide ring of the rotary electric machine of FIG. It is a partial extraction enlarged view of the guide ring of FIG. It is a mounting explanatory view of the guide ring of FIG. It is explanatory drawing of the air flow of the rotary electric machine of FIG.

The embodiment of the rotary electric machine according to the present invention will be described with reference to the drawings, but the present invention is not limited to the following embodiments described with reference to the drawings.

<Main embodiment>
The main embodiments of the rotary electric machine according to the present invention will be described with reference to FIGS. 1 to 4.

As shown in FIG. 1, a rotating shaft 12 is disposed inside the inner hollow frame 11, and both ends of the rotating shaft 12 are rotatably supported by the frame 11. A cylindrical rotor 13 is coaxially attached to the middle of the outer peripheral surface of the rotating shaft 12 in the axial direction.

On the outer periphery of the rotor 13, a cylindrical stator 14 having coil ends 15 protruding from both ends is arranged coaxially with the rotor 13 so as to have a gap G. In the stator 14, a plurality of ducts 14a communicating the inner peripheral side and the outer peripheral side are formed along the axial direction, and the outer peripheral side is surrounded by the partition plate 16 mounted in the frame 11. It is fixedly supported.

That is, the rotating shaft 12 is arranged so as to penetrate the inside of the stator 14, and the rotor 13 is arranged so as to be located between the rotating shaft 12 and the stator 14. There is.

A cover 17 of the coil end 15 that covers the inside of the stator 14 in the axial direction of the stator 14 is arranged on the outer side of the coil end 15 of the stator 14 in the radial direction of the stator 14. The cover 17 is connected and supported by the partition plate 16.

A propeller-shaped blower fan 18 is coaxially attached to a position of the rotary shaft 12 facing the middle of the coil end 15 in the axial direction of the stator 14, and the blower fan 18 is attached. With the rotation of the rotating shaft 12, air 1 can be supplied from the outer side in the axial direction to the inner side in the axial direction of the rotating shaft 12. That is, the blower fan 18 is attached to the rotating shaft 12 so as to be located on the radial inside of the stator 14 of the coil end 15 of the stator 14.

The partition plate 16 is formed with a plurality of communication holes 16a that communicate between the inside of the partition plate 16 and the inside of the cover 17, which is the outside. A heat exchanger 19 is attached above the partition plate 16.

Inside the coil end 15 of the stator 14 in the radial direction of the stator 14, an annular guide ring 21 (see FIG. 2) positions the blower fan 18 inside the blower fan 18. The coil end 15 is arranged in the middle portion of the stator 14 in the axial direction so as to face the outer end in the radial direction with a gap, and the guide ring 21 is provided in the axial direction. Has a length substantially equal to the axial length of the blower fan 18, in other words, a length necessary and sufficient to cover the radial outside of the blower fan 18 as a shroud.

As shown in FIGS. 2 and 3, a plurality of through holes 21a penetrating along the axial direction are formed in the guide ring 21 at predetermined intervals along the circumferential direction, and the guide ring 21 is formed in FIG. As shown in the above, a binding cord 22 is inserted into each through hole 21a, and the binding cord 22 is fastened to the coil end 15 so as to be fastened to the coil end 15.

Further, the radial inside of the stator 14 of the coil end 15 of the stator 14 is inclined in a tapered shape (about 5 to 15 °) so as to expand the outside of the stator 14 in the axial direction. is doing. Correspondingly, the guide ring 21 has a tapered outer peripheral surface so that the outer side in the axial direction (left side in FIG. 4) is thicker than the inner side in the axial direction (right side in FIG. 4) of the stator 14. It has a trapezoidal axial cross-sectional shape that is tilted (about 5 to 15 °) (see FIG. 4). As a result, the guide ring 21 can be attached to the coil end 15 without causing rattling.

In the rotary electric machine 10 according to the present embodiment, when the rotary shaft 12 is rotated and the heat exchanger 19 is operated, the blower fan 18 is rotated, and as shown in FIG. 5, the said The air 1 that has been heat-exchanged and cooled by the heat exchanger 19 is taken in. At this time, the air 1 flows through the gap on the tip end side of the coil end 15 and then is taken into the blower fan 18, so that the tip end side of the coil end 15 is effectively cooled.

Then, the air 1 taken in by the blower fan 18 circulates inside the guide ring 21 and is sent out with a directivity along the axial direction of the rotary shaft 12, so that most of them are sent out. By flowing into the gap G between the rotor 13 and the stator 14 and circulating in the gap G and in the duct 14a of the stator 14, the magnet portion of the rotor 13 and the stator 14 The internal winding portion is cooled and sent out from the inside of the duct 14a, while the rest that has not flowed into the gap G flows through the gap on the proximal end side of the coil end 15, thereby causing the coil end. The base end side of the 15 is cooled, and it flows out to the inside of the cover 17, flows into the inside of the partition plate 16 through the communication hole 16a of the partition plate 16, and circulates in the duct 14a. After merging and being cooled by the heat exchanger 19, it is sent out to the outside of the partition plate 16 and circulated so as to be taken in by the blower fan 18 again.

That is, in the rotary electric machine 10 according to the present embodiment, the guide ring 21 is attached to the inside of the coil end 15 so as to cover the radial outside of the blower fan 18 as a shroud.

Therefore, in the rotary electric machine 10 according to the present embodiment, even if the blower fan 18 rotates at a considerably high speed, the blower fan 18 does not apply a large amount of stress to the blades of the blower fan 18 and the guide ring 21. Since the air 1 can be sent out by giving the air 1 taken in to the air 1 along the axial direction of the rotating shaft 12, a large amount of the air 1 can flow into the gap G.

Therefore, according to the rotary electric machine 10 according to the present embodiment, it is possible to efficiently supply the air 1 to the gap G even if the size is large.

Further, by inserting the binding cord 22 through the through hole 21a of the guide ring 21 and binding it to the coil end 15, the tightening cord 22 is not exposed to the inner peripheral surface of the guide ring 21 and the guide is not exposed. Since the ring 21 can be tightened to the coil end 15, the inner peripheral surface side of the guide ring 21 can be smoothed, and the air 1 flowing in the guide ring 21 causes turbulence, current transformer, or the like. It is possible to greatly suppress the occurrence.

Since the guide ring 21 is constantly subjected to stress such as mechanical vibration and electromagnetic vibration to the coil end 15, a hollow or solid ring made of a metal such as aluminum, iron, or an alloy thereof. Insulating tape such as glass-based tape or glass-based mica tape wrapped around the body (considering the effects of magnetic loss), and fillers such as thermoplastic resin, thermoplastic resin, alumina, and silica. It is preferable that it is made of fiber reinforced plastic (FRP) in which fibers such as glass fiber and aramid resin fiber are added to plastics such as the above resin to which the above-mentioned resin is added, and in particular, various usage conditions such as aging deterioration are taken into consideration. , It is very preferable that it is made of FRP using a thermosetting resin such as an epoxy resin or an unsaturated polyester resin.

Further, as the binding cord 22, a glass fiber rope in which a core material in which glass fibers are bundled is surrounded by a sleeve made of a glass woven cloth or a glass polyester woven cloth is preferable, and the bound glass fiber rope is impregnated with a resin to be strong. Can be fixed to. Such a glass fiber rope has flexibility and resin permeability, and even if stress such as mechanical vibration or electromagnetic vibration is constantly applied to the coil end 15, loosening due to the vibration does not occur. As well as being able to be firmly fixed, it is possible to prevent frictional wear of the surface due to loose vibration.

<Other embodiments>
In the above-described embodiment, the case where the guide ring 21 having a trapezoidal axial cross-sectional shape in which the outer peripheral surface is inclined in a tapered shape (about 5 to 15 °) is applied has been described, but the present invention has been described. Not limited to this, for example, when the radial inside of the stator of the coil end of the stator is parallel to the axial direction of the stator without being inclined, the case corresponds to this. It is preferable to apply a guide ring having a rectangular axial cross-sectional shape with the outer peripheral surface parallel to the inner peripheral surface so that the coil end can be attached without rattling.

Even if the rotary electric machine according to the present invention is large, it can be easily used to efficiently supply air to the gap between the stator and the rotor, so that it can be used extremely beneficially in industry. ..

1 Air 10 Rotating machine 11 Frame 12 Rotor shaft 13 Rotor 14 Stator 14a Duct 15 Coil end 16 Partition plate 16a Communication hole 17 Cover 18 Blower fan 19 Heat exchanger 21 Guide ring 21a Through hole 22 Tightening cord G gap

Claims (2)

With an internal hollow frame,
A cylindrical stator that is supported by the frame and has coil ends protruding from both ends.
A rotating shaft that penetrates the inside of the stator and is rotatably supported with respect to the frame.
A cylindrical rotor that is attached to the rotating shaft so as to be located between the rotating shaft and the stator and has no ventilation duct through the inside .
In a rotary electric machine provided with a propeller-shaped blower fan mounted coaxially with the rotating shaft so as to be located inside the stator of the stator of the stator in the radial direction.
It is attached to the inside of the stator of the coil end of the stator so as to cover the radial outside of the blower fan so as to face the radially outer end of the blower fan with a gap. Equipped with a circular guide ring ,
The guide ring is formed with a plurality of through holes penetrating along the axial direction along the circumferential direction, and a binding cord is inserted through the through holes and fastened and fixed to the coil end only by the binding cord. A rotating electric machine characterized by being In the rotary electric machine according to claim 1 ,
The rotary electric machine is characterized in that the guide ring has a trapezoidal axial cross-sectional shape in which the outer peripheral surface is inclined in a tapered shape so that the outer side in the axial direction is thicker than the inner side in the axial direction of the stator. ..

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