JP2000116060A - Rotating electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotating electric machine, which can be miniaturized by increasing the gas quantity flowing between the magnetic poles of a rotor, optimizing the gas quantity distribution in the electric machine, suppressing the local temperature rise in a rotor coil and a stator coil, and to uniformize the coil temperature. SOLUTION: A frame, a stator 5 where stator ducts 53 and stator coils 52 are installed in stator iron cores 51 supported by the frame, a rotor 3 where rotor coils 33 are wound to the rotary shaft 31 supported by the frame and a rotor iron core 32 installed in the rotating shaft 31 by leaving a gap with the stator 5, a fan installed in the frame or inside the frame and a guide 7, which is installed such a way that the cooling gas quantity which is taken in or discharged by the fan 4 becomes larger in the side of the rotor 3 than the side of the stator 5 are installed in the electric machine.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotating electric machine that cools a rotor or a stator whose temperature increases during operation by blowing air.

[0002]

2. Description of the Related Art A rotating electric machine such as a DC machine, a synchronous machine or an induction machine is structurally composed of a rotor and a stator, and functionally performs mutual conversion between electric energy and mechanical energy. In principle, electromagnetic induction is used.

When these rotary machines are operated, it is known that there are losses such as iron loss, copper loss, mechanical loss, friction loss and windage loss. Most of these losses are converted into heat energy and The temperature rises. That is, when a load is applied to the device, the winding (coil) and the iron core generate heat, and when the temperature rises and this value becomes too high, the deterioration of the insulator is accelerated.
It may cause burnout or short circuit.

[0004] Further, various insulating materials are usually designed so as to be sufficiently durable for use for 10 to 20 years, but it is said that the life is reduced by half as the use temperature rises by 8 to 10 ° C.

[0005] Therefore, in the rotating machine, the rotor and the stator are cooled by ventilating the cooled gas or flowing the liquid inside the machine. For example, a rotary electric machine having a conventional ventilation cooling type rotor has a configuration as shown in FIG.

FIG. 9 shows a rotating electric machine of a double suction cooling type in which the upper half is sectioned.
Is a cover member, 2 and 2 are bearings provided on both sides of the frame 11, and 3 is a rotor having a rotating shaft 31 supported between the bearings 2 and 2. A rotor core 32 on which a rotor coil 33 is wound and axial fans 4 and 4 are fitted around the rotor core 32 around a rotation shaft 31 of the rotor 3.

Reference numeral 5 denotes a stator supported by the frame 11. A stator core 53 is provided with a stator duct 53 and a stator coil 52, and is disposed with the rotor core 32 via a gap. .

Reference numeral 6 denotes a windbreak plate fixed to the frame 11 so as to cover the outer peripheral portions of the axial fans 4, 4. The cooling air W generated by the axial fans 4, 4 is recirculated near the axial fans 4. We prevent that we do.

In the rotating machine having such a configuration, cooling air W is sucked into the machine from both directions along the rotating shaft 31 by the axial fans 4 and 4, and the cooling air W is supplied to the stator coil as shown by arrows. The flow branches in the direction of 52 and the one that enters between the magnetic poles of the rotor 3 consisting of the rotor core 32 and the rotor coil 33 and exits to the stator duct 53 to cool the rotor coil 33 and the stator coil 52. It has a structure to do.

FIG. 9 shows a two-sided suction cooling system in which the flow of the cooling air W is taken from both directions along the rotating shaft 31. However, a one-way ventilation cooling system in which the flow of the cooling air flows in one direction. In the case of, a centrifugal fan is fitted on the rotating shaft.

[0011]

However, in the rotating electric machine having the above-described structure, the cooling air W flowing between the magnetic poles of the rotor 3 and flowing out to the stator duct 53 has a more ventilation passage than the cooling air W flowing in the direction of the stator coil 52. The area is small, the ventilation resistance when entering the rotating body, the ventilation resistance due to the coil bracket, and the ventilation resistance of the stator duct 53 increase the pressure loss and increase the amount of air flowing to the stator coil 52 side. The amount of air flowing between the magnetic poles was reduced.

With such an air flow distribution, the air flow between the magnetic poles of the rotor 3 and the stator duct 53 is not sufficient.
There is a problem that the temperature rise of the stator coil 52 near the center of the stator core 51 and the rotor coil 33 near the center of the rotor core 32 is locally increased. The electric machine was upsized.

The present invention has been made in view of the above problems,
By increasing the air flow between the magnetic poles of the rotor and optimizing the air flow distribution in the rotating electric machine, minimizing the local temperature rise of the rotor coil and stator coil and making the coil temperature uniform, It is an object of the present invention to provide a rotating electric machine that can be implemented.

[0014]

According to a first aspect of the present invention, there is provided a rotating electrical machine comprising: a frame; a stator having a stator core supported by the frame and a stator duct and a stator coil; A rotating shaft rotatably supported by a frame, a rotor having a stator coil and a rotor coil wound around the rotating shaft provided on the rotating shaft with a gap therebetween, and provided inside or outside the frame. It is characterized by comprising a fan and a guide provided such that the amount of cooling air taken in or discharged by the fan is larger on the rotor side than on the stator side.

Conventionally, a large amount of cooling air can be forced to flow between the magnetic poles on the rotor side where the amount of inflow air is small by a ring-shaped guide member, thereby increasing the amount of cooling air on the rotor side and increasing the air flow distribution. Is optimized, and the magnetic poles on the rotor side can be efficiently cooled.

Means for increasing the amount of cooling air on the rotor side from the stator side include adjusting the distance between a ring-shaped guide member and a windbreak plate provided so as to surround the guide member. It can be achieved even if done. The arrangement of the fan for sending and discharging the cooling air may be inside or outside the frame.

Therefore, the local temperature rise of both the coils and the cores of the rotor and the stator can be suppressed, and the temperatures can be made uniform.

According to a second aspect of the present invention, there is provided a rotating electric machine comprising a frame, a stator having a stator core provided with a stator duct and a stator coil, and a shaft supported by the frame. A rotating shaft, a rotor provided with a gap between the stator and the rotor on the rotating shaft, a rotor coil wound around a rotor core, a fan provided inside or outside the frame, and the rotor A ring-shaped guide member that is provided on a rotation shaft portion close to the rotor core and blows air toward the rotor side, and a windbreak plate that is provided with a gap in the ring-shaped guide member. It is characterized by.

According to the present invention, a fan for forcibly ventilating the inside of the machine body is provided inside the machine body, that is, the frame or the frame constituting the rotating electric machine, and the ventilation is directed to the rotor side by the guide member, and the fan is directed toward the rotor side. The cooling air volume is increased and the air volume distribution is optimized, so that the magnetic poles on the rotor side can be efficiently cooled.

According to a third aspect of the present invention, there is provided a rotating electric machine comprising a frame, a stator having a stator core provided with a stator duct and a stator coil, and a shaft supported by the frame. A rotating shaft provided on the rotating shaft with a gap between the stator and the rotor, a rotor having a rotor core wound with a rotor coil, and a shaft fitted to a rotating shaft portion close to the rotor core A flow fan, a ring-shaped guide member provided on a rotation shaft portion between the rotor core and the axial flow fan, and blowing air from the fan to the rotor side,
This ring-shaped guide member is provided with a windbreak plate provided with a gap therebetween.

According to the present invention, a fan and a guide member for forcibly ventilating the inside of the body are provided on the rotating shaft of the rotor, and the ventilation is directed to the rotor by the guide member, so that the magnetic poles of the rotor can be cooled. The same operation as in the second aspect is achieved.

A rotary electric machine according to a fourth aspect of the present invention is characterized in that the axial fan and the ring-shaped guide member are integrated.

An axial flow fan is provided in the ring-shaped guide member, and can be miniaturized integrally, and can efficiently cool the magnetic poles of the rotor.

A rotating electric machine according to a fifth aspect of the present invention is characterized in that an axial fan and a ring-shaped guide member are provided on both sides of a rotor core.

By forcibly ventilating the rotor core from both sides facing the rotor core through the guide member, the rotor core can be efficiently cooled, and the same effect as described in the third aspect is exerted.

A rotating electric machine according to a sixth aspect of the present invention includes a frame, a stator having a stator core provided with a stator duct and a stator coil, and a shaft supported by the frame. A rotating shaft and a rotor provided with a gap from the stator on the rotating shaft with a rotor coil wound around a rotor core, a centrifugal fan provided inside or outside the frame, A ring-shaped guide member is provided on the rotation shaft portion close to the rotor core of the child and blows air toward the rotor, and a windbreak plate is provided on the ring-shaped guide member with a gap therebetween. It is characterized by the following. According to the present invention, a magnetic pole of a rotor is provided by providing a fan for forcibly ventilating the interior of the body, providing a ring-shaped guide member on a rotating shaft of the rotor, and directing the ventilation to the rotor by the guide member. Can be cooled,
The same operation as in the second aspect is achieved.

[0027] A rotating electric machine according to a seventh aspect of the present invention is characterized in that the ring-shaped guide member has a ventilation hole formed in the guide plate.

By forming the ventilation holes in the guide plate, the flow of the cooling air in the machine is changed, and the air flow distribution can be adjusted to obtain the optimum air flow distribution.

The rotating electric machine according to claim 8 of the present invention is characterized in that the ring-shaped guide member has a plurality of support portions for connecting and supporting the guide plates inclined with respect to the axis.

By forming an inclined portion on the support portion itself or on a portion protruding from the support portion, the passing wind becomes strong wind by the action of the fan during rotation, and the amount of air can be increased. This has the effect of well cooling the magnetic pole.

A rotating electric machine according to a ninth aspect of the present invention is characterized in that the boss of the ring-shaped guide member has a conical shape or a truncated conical shape with the rotor core side being the bottom.

By making the shape of the boss of the guide member conical or frusto-conical, the area of the opening on the outflow side is smaller than the area of the opening on the inflow side. As a result, the amount of air can be increased, and the amount of air flowing into the magnetic pole on the rotor side can be increased to further enhance the cooling effect.

[0033]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the rotating electric machine according to the present invention will be described below with reference to FIGS. The figure shows a rotating electric machine equipped with a double suction cooling type rotor such as a DC machine, a synchronous machine or an induction machine. FIG. 1 is a front sectional view of an upper part, and FIG. In the omitted perspective view, the same parts as those in FIG. 9 are denoted by the same reference numerals, and description thereof will be omitted.

In FIG. 1, the part different from FIG. 9 is the part of the rotor 3 shown in FIG.
A ring-shaped guide member 7 is provided between a rotor core 32 provided with a rotor coil 33 provided therein and axial flow fans 4 and 4 fitted in front and rear of the rotor core 32. 7
Is fitted. FIG. 2 shows a state in which the guide member 7 is fitted to only one end of the rotor core 32.

The ring-shaped guide member 7 is provided on the rotating shaft 3
A boss 72 having a shaft hole 71 to be fitted into one and a plurality of, here four, support portions 74 for connecting and supporting a ring-shaped guide plate 73 are formed.

Then, the ring-shaped guide members 7, 7
Is provided with a predetermined gap from the stator 5 supported in the frame 11 to constitute a rotating electric machine.

When the rotating electric machine having such a configuration is operated,
When the rotor 3 rotates, the axial fans 4, 4 and the ring-shaped guide members 7, 7 rotate together, and the cooling air W introduced from the suction port is rotated by the axial fans 4, 4.
And is sent to the stator 5 side.

The cooling air W from the axial fan 4 is guided by ring-shaped guide members 7, 7 as indicated by arrows, and most of the cooling air W is supplied to the rotor core 32 of the rotor 3 and the rotor coil 33. Between the magnetic poles consisting of
A part thereof is a ring-shaped guide member 7 and this guide member 7
Can be directed toward the stator coil 52 through the space between the windshield plate 6 and the windshield plate 6 provided to surround the coil.

The cooling air W flowing between the magnetic poles of the rotor 3 takes heat of the rotor core 32 and the rotor coil 33 and enters the stator ducts 53,. The heat of the iron core 51 is removed, and the iron core 51 passes through the stator ducts 53,.

The cooling air W flowing into the stator coil 52 takes heat of the stator coil 52 and passes outward (upward). Further, a part of the cooling air W passes through a gap between the rotor 3 and the stator 5 and passes through the stator duct 53,
Are discharged to the outside together with the cooling air W that has escaped from the discharge port (not shown) of the cover member 12.

A larger amount of cooling air W is forced to flow from the axial fan 4 toward the ring-shaped guide members 7, 7 between the magnetic poles on the rotor 3 side where the amount of inflow air is small. The rotor 3 can be moved through the guide members 7,7.
The cooling air flow is increased by directing ventilation to the side, and the air flow distribution is optimized, and the cooling air W flowing to the stator ducts 53,... Via the rotor 3 as well as the magnetic poles on the rotor 3 side also increases. Therefore, the stator 5 side can also be efficiently cooled.

Therefore, the local temperature rise of the coils 33 and 52 and the iron cores 32 and 51 of the rotor 3 and the stator 5 can be suppressed and the temperature can be made uniform, and the rotating electric machine can be downsized. .

As a means for increasing the amount of cooling air on the rotor 3 side from the stator 5 side, the distance between the ring-shaped guide member 7 and the windbreak plate 6 provided so as to surround the guide member 7 is adjusted. It can also be performed by doing.

An axial fan 4 provided on the rotor 3
The ring-shaped guide member 7 may be integrated with the ring-shaped guide member 7 as shown in FIG. In this case, the axial fan 4 is mounted in the cylindrical guide plate 73 forming the guide member 7, and the cooling air from the axial fan 4 flows into the guide plate 73 efficiently and rotates from the opening. It can be sprayed toward the rotating core 31 of the child 3. In addition, the axial fan 4 and the guide member 7 can be integrated to reduce the size, and the magnetic poles of the rotor 3 can be efficiently cooled. The axial fan 4 and the ring-shaped guide member 7 are
1 and may be rotated in synchronization with the rotating shaft 31 or may be freely rotated by frictional contact with the rotating shaft 31 without being fixed to the rotating shaft 31.

FIG. 4 is a front sectional front view showing a rotary electric machine according to a second embodiment of the present invention. The same parts as those in FIGS. 1 and 2 are denoted by the same reference numerals, and description thereof is omitted. .

FIG. 4 shows a one-way cooling type rotating electric machine in which the flow of cooling air W is in one direction.
An axial fan is not provided in the rotor core 32 provided in 1, and the ring-shaped guide member 7 is fitted on only one side of the rotor core 32. Further, a windbreak plate 6 is provided near the periphery of the ring-shaped guide member 7. Reference numeral 8 denotes a centrifugal fan provided at the other end of the frame 11, reference numeral 13 denotes a suction port formed at one end of the frame 11, and reference numeral 14 denotes a discharge port formed at the other end. And
When the rotating electric machine having this configuration is operated, the rotor 3 and the centrifugal fan 8 rotate. Then, by the rotation of the centrifugal fan 8, gas serving as the cooling air W is sucked into the frame 1 from the suction port 13 and flows into the frame 1. And flows between the magnetic poles composed of the rotor core 32 and the rotor coil 33 of the rotor 3, and a part thereof passes between the guide plate 73 and the windbreak plate 6, and the stator coil 52 side. You can go to.

As shown by the arrows, the cooling air W flowing between the magnetic poles of the rotor 3 removes the heat of the rotor core 32 and the rotor coil 33 and fixes the same as in the first embodiment. The cooling air W that has flowed into the stator ducts 52, takes in the heat of the stator coils 52, flows outward (upward), and is discharged through the centrifugal fan 8. 14 is discharged to the outside of the cover member 11.

In the case of the second embodiment,
By providing the ring-shaped guide member 7 on the rotor 3 side similarly to the first embodiment, a large amount of cooling air W can be made to flow, and the cooling air volume on the rotor 3 side is increased and the air volume is increased. The distribution is optimized, and the magnetic poles on the rotor 3 side can be efficiently cooled. Therefore, the temperature of the rotor 3 does not locally rise, the temperature is made uniform, and the size of the rotating electric machine can be reduced.

FIGS. 5 to 8 are perspective views or main parts of another embodiment of the ring-shaped guide member 7 of the present invention in which the cooling air W is guided mainly in the direction of the rotor 3. FIG. It is an enlarged explanatory view. In the figure, the same parts as those in FIG. 2 are denoted by the same reference numerals, and description thereof will be omitted.

The ring-shaped guide member 7 shown in FIG. 5 has a plurality of slit-shaped ventilation holes 7 formed in a cylindrical guide plate 73.
5, ... are formed.

By forming the ventilation holes 75,... In the guide plate 73, the flow of the cooling air W in the machine is changed, and the air volume distribution is adjusted, so that an optimal air volume distribution can be obtained.

The shape and number of the ventilation holes 75 may be changed.

The ring-shaped guide member 7 shown in FIG.
Are a plurality of support portions 74 for connecting and supporting the guide plate 73.
Is made of a plate-like body and is provided to be inclined with respect to the axis. Since the support portions 74 are inclined with respect to the axis in this manner, the cooling air W passing through the rotating guide member 7 becomes a strong wind due to the action of the fan, and can increase the air volume. The magnetic pole comprising the coil 32 and the rotor coil 33 can be cooled well. In addition, this support part 74,
The same operation and effect can be obtained even when the... Column is a column and the surface along the axis is an inclined surface.

In FIG. 7, the plurality of support portions 74 for connecting and supporting the guide plate 73 are formed with inclined pieces 76 projecting from the end faces on the entrance side.

The guide member 7 also has the inclined pieces 76,... Inclined with respect to the axis, so that the cooling air W passing through the guide member 7 becomes strong and can increase the amount of air. The same operation and effect as those of the guide member 7 shown in FIG. In addition, the above-mentioned inclined surface or the inclined piece 76 is not limited to a planar shape, and may be a curved surface.

The ring-shaped guide member 7 shown in FIG.
The shape of the boss 72 having the central shaft hole 71 has a truncated cone shape with a small diameter on the inflow side and a truncated conical shape indicated by a dashed line 77 with a large diameter on the rotor core side on the outflow side. What to do.

By making the shape of the boss 72 of the guide member 7 frusto-conical, the area of the opening on the outflow side is smaller than the area of the opening on the inflow side, so that the cooling air W passing through the guide member 7 is strong wind. And the amount of air can be increased, and the amount of air flowing into the magnetic pole formed by the rotor core 32 and the rotor coil 33 can be increased to further improve the cooling effect.

The shape of the boss 72 is not limited to the frusto-conical shape, but may be a conical shape as shown by a chain line 77 in FIG. In this case, the same operation and effect as those of the frusto-conical shape can be obtained.

The present invention is not limited to the above embodiment. For example, the cooling air is not limited to being introduced from the outside of the machine and discharged to the outside of the machine, and may be circulating inside the machine, or a cooling air cooling device is provided in the middle of the flow path. There may be.

[0060]

According to the first aspect of the present invention, the cooling air volume on the rotor side is increased and the air volume distribution is optimized, so that the magnetic poles on the rotor side can be efficiently cooled.

Therefore, it is possible to suppress the local temperature rise of both the coils and the iron cores of the rotor and the stator and to make the temperature uniform, and to provide a rotating electric machine which is smaller than the conventional rotating electric machine with the same output. .

According to the second aspect of the present invention, since the fan for forcibly ventilating the inside of the machine is provided and the ventilation is directed to the rotor by the guide member, the amount of cooling air to the rotor side is increased. At the same time, the air volume distribution is optimized, and the magnetic poles on the rotor side can be efficiently cooled.

According to the third aspect of the present invention, the fan and the guide member for forcibly ventilating the inside of the machine are provided on the rotating shaft of the rotor, and the ventilation is directed to the rotor by the guide member. The same effect as the second aspect is exhibited.

According to the fourth aspect of the present invention, the axial flow fan is provided in the ring-shaped guide member, so that the axial flow fan can be integrated and downsized, and the rotor magnetic pole can be efficiently cooled. The same effect is obtained.

According to the fifth aspect of the present invention, the rotor core can be efficiently cooled by forcibly ventilating the rotor core from both sides through the guide members. Present.

According to the sixth aspect of the present invention, a fan for forcibly ventilating the inside of the body is provided in the body and a ring-shaped guide member is provided on the rotating shaft of the rotor, and the ventilation is performed by the guide member by the guide member. In this case, the magnetic poles of the rotor can be cooled, so that the same effect as described in the second aspect can be obtained.

According to the seventh aspect of the present invention, the rotor core can be efficiently cooled by forcibly ventilating the air through the guide members from both sides facing the rotor core. The effect of is exhibited.

According to the eighth aspect of the present invention, by forming the ventilation holes in the guide plate, the flow of the cooling air in the machine is changed, and the air flow distribution can be adjusted to obtain the optimum air flow distribution. .

According to the ninth aspect of the present invention, by forming the inclined portion on the support portion itself or on a portion protruding from the support portion, the passing wind becomes a strong wind by the action of the fan during rotation, and the amount of air can be increased. This has the effect of well cooling the magnetic pole formed by the rotor core and the rotor coil.

According to the tenth aspect of the present invention, since the shape of the boss of the guide member is conical or frusto-conical, the area of the opening on the outflow side is smaller than the area of the opening on the inflow side. In addition, the cooling air that has passed through the guide member becomes a strong wind and the amount of air can be increased, and the amount of air flowing into the magnetic pole on the rotor side can be further increased to further enhance the cooling effect.

[Brief description of the drawings]

FIG. 1 is an upper cross-sectional front view showing a first embodiment of a rotating electric machine according to the present invention.

FIG. 2 is a perspective view in which a part of a rotor shown in FIG. 1 is omitted.

FIG. 3 is a perspective view showing an embodiment of a ring-shaped guide member integrated with an axial fan according to the present invention.

FIG. 4 is an upper cross-sectional front view showing a second embodiment of the rotating electric machine according to the present invention.

FIG. 5 is a perspective view showing another embodiment of the ring-shaped guide member according to the present invention.

FIG. 6 is a perspective view showing another embodiment of the ring-shaped guide member according to the present invention.

FIG. 7 is a perspective view showing another embodiment of the guide member according to the present invention.

FIG. 8 is a perspective view showing another embodiment of the ring-shaped guide member according to the present invention.

FIG. 9 is an upper sectional front view showing an example of a conventional rotating electric machine.

[Explanation of symbols]

 11: Frame 3: Rotor 31: Rotating axis 32: Rotor core 33: Rotor coil 4: Axial fan 5; Stator 51: Fixed core 52: Fixed coil 53: Stator duct 6: Windbreak plate 7: Ring Guide member 72: boss 73: guide plate 74: support part 75: ventilation hole 76: inclined piece 8: centrifugal fan W: cooling air

Claims (9)

[Claims] 1. A frame, a stator in which a stator duct and a stator coil are provided on a stator core supported by the frame, a rotating shaft pivotally supported by the frame, and the stator by the rotating shaft. A rotor provided with a gap, a rotor coil wound around a rotor core, a fan provided inside or outside the frame, and a cooling air volume taken in or exhausted by the fan,
A guide provided so that the rotor side is larger than the stator side. 2. A frame, a stator in which a stator duct and a stator coil are provided on a stator core supported by the frame, a rotating shaft pivotally supported by the frame, and the stator by a rotating shaft. A rotor provided with a gap, a rotor coil wound around a rotor core, a fan provided inside or outside the frame, and a rotating shaft portion close to the rotor core of the rotor. A rotating electric machine, comprising: a ring-shaped guide member provided to blow air to a rotor side; and a windbreak plate provided in the ring-shaped guide member with a gap. 3. A frame, a stator in which a stator duct and a stator coil are provided on a stator core supported by the frame, a rotating shaft pivotally supported by the frame, and the stator by a rotating shaft. A rotor provided with a gap, a rotor coil wound around a rotor core, an axial fan fitted to a rotating shaft portion close to the rotor core, the rotor core and the axial flow A ring-shaped guide member provided on a rotating shaft portion between the fan and the fan to blow air from the fan to the rotor side, and a windbreak plate provided on the ring-shaped guide member with a gap therebetween. A rotating electric machine characterized by: 4. The rotating electric machine according to claim 3, wherein the axial fan and the ring-shaped guide member are integrated. 5. The rotary electric machine according to claim 3, wherein an axial fan and a ring-shaped guide member are provided on both sides of the rotor core. 6. A frame, a stator in which a stator duct and a stator coil are provided on a stator core supported by the frame, a rotating shaft pivotally supported by the frame, and the stator by a rotating shaft. A rotor provided with a gap, a rotor coil wound around a rotor core, a centrifugal fan provided inside or outside the frame, and a rotating shaft portion close to the rotor core of the rotor And a ring-shaped guide member for blowing air to the rotor side, and a windbreak plate provided on the ring-shaped guide member with a gap therebetween. 7. The rotating electric machine according to claim 2, wherein the ring-shaped guide member has a ventilation hole formed in a guide plate. 8. The rotation according to claim 2, wherein the ring-shaped guide member has a plurality of support portions for connecting and supporting the guide plate inclined with respect to the axis. Electric machine. 9. The ring-shaped guide member according to claim 2, wherein the boss has a conical shape or a truncated conical shape whose bottom is on the rotor core side. Rotary electric machine.