JPH07135747A - Rotary electric machine - Google Patents

Abstract

PURPOSE:To prevent dust and dirt contained in the atmosphere from penetrating into a rotor and a stator by a method wherein a wind path which sucks the atmosphere by the rotation of a fan through its space part which is provided between the fan and a side plate or a cover plate and discharges the air from its duct which is provided on the outer circumference of a frame in parallel with the axial direction of the frame is provided. CONSTITUTION:A wind path 20 of a cooling wind which sucks the atmosphere by the rotation of a fan 14 accompanying the rotation of a shaft 8 through a suction inlet 16 into a space part 13 and sends out the air into a duct 18 through an exhaust outlet 19 and discharges the air outside from the duct 18 is provided. As a result, the heat of a rotor 12 side is transmitted to the fan 14 through the contact plane A between the rotor 12 and the fan 14 and is radiated by the cooling wind of the fan 14 and the heat of a stator 4 is transmitted to a frame 1 through the contact plane B between a stator core 2 and the frame 1 and is radiated by the cooling wind flowing through the duct 18 to avoid the overheat of a rotary electric machine 21. Moreover, as the atmosphere does not flow inside the stator 4 and the rotor 12, the penetration of dust and dirt into the stator 4 and the rotor 12 can be avoided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary electric machine.

[0002]

2. Description of the Related Art Conventionally, a rotary electric machine for a vehicle having a structure shown in FIG. 10 is known. This conventional rotating electric machine is of a ventilation cooling type, and a stator iron core 102 is fitted and attached to the inner peripheral surface of a cylindrical frame 101, and the stator iron core 102 is attached to the inner peripheral portion in the axial direction (left and right direction of the drawing). The coils 103 are incorporated into the respective formed slots, and the coils 103 are electrically connected to each other to form the stator 104.

A bearing device 107 is attached to the center of each of the side plate 105 at one end of the frame 101 and the lid 106 at the other end, and both ends of a shaft 108 are rotatably supported by these. The rotor core 109 is attached to the shaft 108.
, And insert the rotor bar 110 into each of a plurality of slots formed in the outer peripheral portion of the rotor core 109 in the axial direction, and weld the end rings 111 to both ends of the rotor bar 110 to form the cage rotor 112. I am configuring.

Such a rotating electric machine is mounted on a vehicle trolley, and the rotor 112 is rotated by energization to rotate the shaft 108.
Is rotated to rotate a wheel (not shown) via the coupling 113 and a gear device (not shown) attached to the end of the shaft 108, so that the vehicle is run.

In a rotating electric machine for a vehicle which is used in this way, cooling air is provided inside the rotating electric machine so as to prevent deterioration of the insulation of the coil 103 and deterioration of the strength of structural members due to heat generation during energized operation. The fan 11 is attached to the shaft 108 in the frame 101 for the purpose of circulation and suppressing the temperature rise.
4 is fitted, and the fan 114 rotates, so that the ventilation filter 115 and the suction port 1 provided at one end of the frame 101.
A self-ventilation cooling structure is adopted in which cooling air introduced into the rotary electric machine via 16 is discharged from a discharge port 117 provided at the other end of the frame 101.

However, in such a self-ventilation cooling type rotary electric machine, since a large amount of dust and dust are contained in the outside air introduced as cooling air, a filter is provided in the ventilation filter 115 to remove it. However, since the rotating electric machine is mounted at a deep position inside the bogie of the vehicle, there is a problem that maintenance work for cleaning dust and dirt attached to the filter takes time.

The dust and dust not removed by the ventilation filter 115 flow along with the cooling air in the ventilation passage in the rotating electric machine, but are often adhered to the parts in the rotating electric machine and are kept warm by such dust and dust. Due to the effect of heat insulation, the temperature of the rotating electric machine will rise compared to when it was new, and insulation deterioration will be accelerated, and rotation imbalance will occur in the rotor, causing vibration and damage to the bearing and insulation. There was a problem.

Therefore, a structure having a closed structure as shown in FIG. 11 in which the self-ventilation type is stopped and cooling air is not introduced into the rotating electric machine has been proposed (see FIG.
The parts common to those of the rotating electric machine of No. 0 are designated by the same reference numerals.) In the case of the sealed type, there is no choice but to rely on cooling from the outer surface of the rotating electric machine. Considering the balance of heat balance with heat dissipation, the frame must be made large in size, and there is a problem that the frame cannot be mounted and used in a narrow installation space of the vehicle bogie.

[0009]

As described above, in the conventional self-ventilated cooling type rotary electric machine, when it is mounted on a vehicle and used, periodical cleaning and maintenance are required to avoid adverse effects due to dust and dirt. It is necessary, and when it is installed in a small installation space of the trolley, there is a problem that the work takes too much time.

Further, in the sealed type rotating electric machine, there is a problem that the frame becomes large and it is difficult to mount a frame having a sufficient output in a small installation space of the truck for use.

The present invention has been made in view of the above-mentioned problems of the prior art, and uses a self-ventilated cooling type to reduce the frequency of cleaning and maintenance work required to deal with dust and dust, and to perform the work. It is an object of the present invention to provide a rotating electric machine that can reduce the trouble of.

[0012]

According to a first aspect of the present invention, a stator is attached to an inner peripheral surface of a cylindrical frame, and a rotor fitted to a shaft is incorporated in an inner peripheral portion of the stator, and In a rotating electrical machine in which axial end portions of a shaft are rotatably supported by bearing devices provided in the central portions of the side plate at one end and the lid body at the other end, the outside air is axially aligned with the outer peripheral portion of the frame. A duct communicating with the fan is formed, and the central portion of the fan is fitted to the shaft inside at least one of the side plate and the lid of the frame in a state of being in thermal contact with a part of the rotor, and the outer peripheral portion of the fan is attached to the frame. A small gap is opened on the inner peripheral surface so that they face each other, and a suction port that takes in outside air is formed in the side plate or lid located outside the fan, and the outer peripheral portion of the fan and the side plate or lid located outside of it Outer circumference The space portion is obtained by forming the discharge and mouth to communicate duct and with the end of the frame between.

According to a second aspect of the present invention, in the rotary electric machine according to the first aspect, the other end of the heat conducting member which is in partial contact with the rotor is brought into contact with the fan.

According to the third aspect of the present invention, the stator is attached to the inner peripheral surface of the cylindrical frame, and the rotor fitted to the shaft is incorporated in the inner peripheral portion of the stator. In a rotating electric machine in which both axial ends of a shaft are rotatably supported by bearing devices provided in the central portions of the respective lids, a duct communicating with outside air is formed along the axial direction on the outer peripheral portion of the frame. The central portion of the fan is fitted to the shaft on the outer side of at least one of the side plate or the lid, and the side plate or the lid located inside the fan is provided with a vent for ventilating the rotor and the vent. And an inner peripheral part of the stator to form an annular closed part, which forms a suction port for taking in outside air to the fan, and the outer peripheral part of the fan and the side plate or lid located inside thereof. Between the outer circumference Between portion is obtained by forming a duct and communicating the discharged mouth to pass the end of the frame.

According to a fourth aspect of the present invention, in the rotating electric machine according to the first or third aspect, the other end of the heat conducting member whose one end is in contact with the heat generating portion of the stator is penetrated through the frame and exposed to the duct. Is.

According to a fifth aspect of the present invention, in the rotary electric machine according to any one of the first to fourth aspects, the duct is formed in the frame with respect to a position where a space is provided when the frame is attached to the vehicle bogie.

[0017]

In the rotating electric machine according to the present invention, the outside air is sucked into the space between the fan and the side plate or the lid through the suction port by the rotation of the fan, and is discharged into the duct through the discharge port. The heat generated by the rotor is dissipated by the fan that is in thermal contact with it, and the heat generated by the stator is cooled by the air passing through the duct through the frame and the overall ventilation Cooling is performed.

Moreover, by making the outer peripheral portion of the fan face the inner peripheral surface of the frame with a slight gap,
Dust and dust contained in the air taken in from the outside by the rotation of the fan will not enter the rotor and stator parts, and the frequency of maintenance and cleaning required for dust and dirt adhesion can be reduced. it can.

In the rotating electric machine of the second aspect of the present invention, the other end of the heat conducting member, a portion of which is in contact with the rotor, is brought into contact with the fan, so that the heat generated by the rotor is conducted to the fan and the heat is efficiently radiated. It is possible to improve the ventilation cooling efficiency.

In the rotating electric machine according to the third aspect of the invention, the outside air is sucked into the space between the fan and the side plate or the lid through the suction port by the rotation of the fan, and is discharged into the duct through the discharge port. A ventilation passage is formed to be discharged to the stator, whereby heat generated by the stator is cooled by the air passing through the duct through the frame. At the same time, the rotor is cooled by ventilating the rotor through the ventilation holes formed in the side plate or the lid located inside the fan, thereby cooling the entire ventilation.

Moreover, the annular closing portion provided on the side plate or the lid prevents the air flow from occurring between the ventilation hole and the inner peripheral portion of the stator, and the air taken in from the outside by the rotation of the fan. Since the dust and dirt contained in the dust will not enter the inside of the stator, it is possible to reduce the frequency of maintenance and cleaning required for the adhesion of dust and dirt.

In the rotating electric machine of the fourth aspect of the present invention, the heat of the heat generating portion of the stator is radiated in the duct by exposing the other end of the heat conducting member whose one end is in contact with the heat generating portion of the stator to the duct. Therefore, the cooling effect can be enhanced in combination with the cooling of the frame.

In the rotating electric machine according to the fifth aspect of the present invention, the duct is formed on the frame so that a space is available when the truck is mounted, so that the duct can be mounted on the truck without expanding the installation space.

[0024]

Embodiments of the present invention will now be described in detail with reference to the drawings. 1 and 2 show a common embodiment of the inventions of claims 1 and 5 and show a rotary electric machine for mounting on a vehicle. The rotating electric machine of this embodiment has a cylindrical frame 1
The stator iron core 2 is fitted and attached to the inner peripheral surface of the coil, and the coil 3 is incorporated into each of a plurality of slots formed in the inner peripheral portion of the stator iron core 2 in the axial direction (left and right direction of the paper in FIG. 1). Stator 4 by electrically connecting between coils 3
Are configured.

The side plate 5 at one end of the frame 1 and the lid 6 at the other end
A bearing device 7 is attached to each central portion, and both ends of a shaft 8 are rotatably supported by these. A rotor iron core 9 is fitted on the shaft 8, a rotor bar 10 is inserted into each of a plurality of slots formed in the outer peripheral portion of the rotor iron core 9 in the axial direction, and end rings 11 are welded to both ends of the rotor bar 10. The basket-shaped rotor 12 is configured.

In the frame 1, the lid 6 and the stator 4
And a space 13 formed between the rotor 12 and the side surface of the rotor 12.
The fan 14 is arranged in the center body part 15 of the fan 14.
Shaft 8 while it is in thermal contact with the side surface of rotor 12.
Is fitted to. The outer diameter of the fan 14 is set so as to maintain a narrow gap G1 between the inner periphery of the frame 1 and dust and dust that cannot pass therethrough.

The lid 6 is provided with a suction port 16 for taking in outside air into the space 13.

On the outside of the cylindrical frame 1, a rectangular cylindrical cover 17 circumscribing it is covered, and ducts 18 serving as air passages are formed at the four corners of the cover 17, respectively. A discharge port 19 for communicating the space 13 and the duct 18 is formed at the end of the frame 1 on the side of the lid body 6. When the fan 14 starts to rotate due to the rotation of the shaft 8, the suction port 16 The air taken into the space 13 is discharged to the duct 18 through the discharge port 19, and the ventilation passage 20 for the cooling air discharged to the outside through the duct 18 is formed.

As shown in FIGS. 2 and 3, such a rotary electric machine 21 has a nose receiver 23 fixed to a beam 22 of a vehicle bogie and a nose 2 integrated with the frame 1.
4 and the mounting foot 25. In the installation space of the rotary electric machine 21, the axle 26 of the vehicle is present at a position opposite to the nose receiver 23, and the shaft 8 is rotated by the rotation of the rotor 12 due to energization, whereby the shaft 8 is attached to the output end of the shaft 8. Rotational force is transmitted to the axle 26 via the coupling 27 and the gear device 28, and the wheels 29 are rotated to drive the vehicle.

For this reason, the installation size of the rotary electric machine 21 is limited within the size D1 between the nose receiver 23 and the axle 26, and the vertical direction is also limited to the size D2 between the vehicle body 30 and the vehicle limit 31. Furthermore, the axial length is also limited to the dimension D3, and the outer dimensions of the rotary electric machine 21 are also the dimension D.
It is limited by 1, D2 and D3, and the duct 18 cannot be unnecessarily large. Therefore, the frame 17 is covered with a circumscribed quadrangular tubular body cover 17 for the frame 1, and ducts 18 are formed at each of the four corners for space efficiency.

Next, the operation of the rotating electric machine having the above structure will be described. The rotor 12 is induced to rotate by the induction magnetic field generated by energizing the coil 3 of the stator 4, and the rotational force is transmitted to the axle 26 through the shaft 8 to drive the wheels 29.

As the shaft 8 rotates, the fan 14
When the co-rotation starts, the outside air is sucked in through the space 16 and the space 1
Ventilation path 2 for the cooling air that is taken into the exhaust gas 3, is discharged from the discharge port 19 to the duct 18, and is further discharged from the duct 18 to the outside.
0 is formed. As a result, the heat generated on the rotor 12 side is transmitted to the fan 14 through the contact surface A between the rotor 12 and the fan 14, and is radiated to the cooling air generated by the fan 14,
The heat generated by the stator 4 is transmitted to the frame 1 through the contact surface B between the stator core 2 and the frame 1, and is dissipated by the cooling air flowing through the duct 18 to prevent the rotating electric machine 21 from overheating.

In addition, in the rotary electric machine of this embodiment, the ventilation passage 20 for the cooling air is separated from the inside of the stator 4 and the rotor 12, and the outside air does not flow into the inside, so that the inside of the stator 4 and the rotor 12 is prevented. There is almost no entry of dust and dirt, and the frequency of cleaning and maintenance to remove them can be reduced.

Next, a common embodiment of the inventions of claims 1, 2 and 5 will be described with reference to FIG. In the rotating electric machine 21 of this embodiment, the heat of the rotor 12 is generated by the fan 14
In order to improve the efficiency of transmission to the rotor core 9, a heat conduction member 32 formed of a material having good heat conduction in the axial direction is embedded in the rotor core 9, and one end of the heat conduction member 32 is located at the contact surface A at the body portion 15 of the fan 14.
It is characterized by being brought into contact with. The configuration of each of the other parts is the same as that of the embodiment shown in FIGS. 1 and 2, and designated by common reference numerals.

Therefore, in the rotary electric machine 21 of this embodiment, not only the heat generated by the rotor 4 is transferred from the contact surface A to the fan 14 to be dissipated, but also the heat conducting member 32 generates heat inside the rotor 12. Can be effectively transmitted to the fan 14 to radiate heat, and overheating due to heat generation of the rotor 12 can be suppressed more effectively.

Next, a common embodiment of the inventions of claims 1, 2, 4 and 5 will be described with reference to FIG. In the rotating electric machine 21 of this embodiment, the outer peripheral portion of the stator iron core 2 of the stator 4 is exposed in the duct 18 by forming the exposing hole 33 in a part of the frame 1, and in the rotor 12. It is characterized in that one end of the rotor bar 34 extended in the axial direction is passed through the fan 14. The structure of the other parts is the same as that of the embodiment shown in FIGS. 1 and 2, and is shown with common reference numerals.

In the rotary electric machine 21 of this embodiment, the stator 4
It is possible to radiate the generated heat by directly contacting with the cooling air flowing in the duct 18 on the exposed surface of the outer peripheral portion of the stator iron core 2 and effectively suppressing the overheat due to the heat generation of the stator 4. At the same time, not only the heat generated by the rotor 4 is transferred from the contact surface A to the fan 14 to be dissipated, but also the heat generated inside the rotor 12 is effectively transferred to the fan 14 by the extended portion of the rotor bar 34 to dissipate the heat. Therefore, the overheating due to the heat generation of the rotor 12 can be suppressed more effectively.

FIG. 6 shows a rotating electric machine 21 of a common embodiment of the inventions of claims 1, 4 and 5, and the feature of this embodiment is that the heat conduction to the coil 3 which is the heat generating portion of the stator 4 is good. The bulging lower end of the heat conducting member 35 is brought into contact with the heat conducting member 35, and the other end of the heat conducting member 35 is penetrated through the frame 1 to be exposed in the duct 18. Regarding other parts,
It is the same as the rotary electric machine of the embodiment shown in FIG. 1 and FIG. 2, and is shown with common reference numerals.

In the rotary electric machine 21 of this embodiment, the stator 4
The heat generated by the stator 4 is radiated from the contact surface B between the coil 3 and the frame 1, and the coil 3 that is a heat-generating component of the stator 4
Of the heat is transmitted directly to the portion of the duct 18 by the heat conduction member 35, where it comes into contact with the cooling air and is radiated, so that overheating of the stator 4 can be suppressed more effectively. .

7 and 8 show a common embodiment of the present invention as claimed in claims 1, 2, 4 and 5, which is characterized by the shape of the fan 14. That is, the fan 14
The heat radiation from the fan 14 is improved by forming the heat radiation fins 36. Further, a partition plate 37 is provided at the portion of the duct 18 to also serve as a reinforcement and improve the heat dissipation. Note that, also in this embodiment, other parts are common to the embodiment shown in FIGS. 1 and 2 and are denoted by the same reference numerals.

Next, a common embodiment of the inventions of claims 3 and 5 will be described with reference to FIG. The constituent members of the stator 4 and the rotor 12 are common to those of the embodiment shown in FIGS. 1 and 2, and the description thereof will be omitted by giving the same reference numerals. The feature of this embodiment is that the fan 14 'is arranged outside the lid 6'on one side of the frame 1', the suction port 38 is formed in the central portion of the fan 14 ', and the lid 6'is formed.
Also, a ventilation hole 39 is formed. The cover 1 having a length that projects further outward than the end of the frame 1'on the lid side
By covering the frame 1'with 7 ', the fan 14'
Between the outer periphery of the cover and the inner periphery of the end of the cover 17 '
9 ', forming duct 18 in cover 17'
It is in communication with ´.

At the central portion of the lid 6 ', a closing rib 40 is provided in an annular shape so as to form a narrow gap G2 at the portion of the rotor 12 facing the end ring 11 so that dust and dust do not enter. is there.

As shown in FIGS. 2 and 3, the rotary electric machine 21 of this embodiment also has a nose receiver 23 fixed to a beam 22 of a vehicle bogie and a nose 2 integrated with the frame 1.
It is fixed by 4 and the mounting foot 25. Then, in the installation space of the rotary electric machine 21, the axle 26 of the vehicle is present at a position opposite to the nose receiver 23, and the shaft 8 is rotated by the rotation of the rotor 12 due to the energization, so that the output end of the shaft 8 is provided. Rotational force is transmitted to the axle 26 through the attached coupling 27 and gear device 28, and the wheels 29 are rotated to drive the vehicle.

Therefore, the external dimensions of the rotary electric machine 21 are D
1, D2, D3, the duct 18 'cannot be unnecessarily large, and the frame 1'is covered with a circumscribing quadrilateral tubular cover 17' for the frame 1 ', and ducts 18' are formed at each of the four corners. In this way, space efficiency will be improved.

Next, the operation of the rotary electric machine of the above embodiment will be described. When the rotor 12 starts rotating due to the induction magnetic field due to the energization of the coil 3, the fan 14 ′ rotates as the shaft 8 rotates. When the fan 14 'rotates, the outside air is taken into the space 13' between the fan 14 'and the lid 6'through the suction port 39 provided in the fan 14',
The duct 18 'from the discharge port 19' by the fan 14 '
A ventilation passage 20 'for the cooling air that is discharged inside and discharged from the outside is formed. Therefore, the heat generated by the stator 4 is radiated from the contact surface B and cooled. Meanwhile, fan 14
A part of the air taken into the space portion 13 ′ of ′ further flows into the side surface portion of the rotor 12 through the ventilation hole 39, comes into contact with the side surface portion of the rotor 12, and returns to the space portion 13 ′ again. The rotor 12 is cooled by returning and joining with cooling air.

As described above, also in the rotating electric machine of this embodiment, the stator 4 and the rotor 12 can be cooled by the cooling air generated by the rotation of the fan 14 ', and the cooling air can cool the stator 4. Since it rarely invades inside, it is possible to reduce the frequency of cleaning and maintenance due to adhesion of dust and dust.

Also in this embodiment, the rotating electric machine 2 is provided because of the fan 14 'and the cover 17' for ventilation cooling.
The installation space of 1 does not become larger than the conventional one.

Even in the embodiment shown in FIG. 9, as shown in FIG. 5, the exposed hole 33 is formed in the frame 1 ', so that a part of the stator 4 is exposed to the duct 18' and cooled. The cooling effect can be enhanced by making direct contact with the wind. Further, as shown in FIG. 6, a heat conducting member 35 may be provided on the stator 4 so that the heat generated by the coil 3 can be radiated more effectively. In addition, the fan 14 'is shown in FIG.
The heat radiation fin 36 as shown in FIG.
It is also possible to form the partition plate 37 in the part of '.

Further, the present invention is not limited to the above-mentioned embodiment, and particularly the forming positions of the ducts 18 and 18 'can be set to a portion where the installation space has a margin when the vehicle is mounted.

[0050]

As described above, according to the invention of claim 1,
By the rotation of the fan, the outside air is sucked into the space between the fan and the side plate or the lid through the suction port, is discharged to the duct through the discharge port, and a ventilation path is formed to be discharged from the duct to the outside. The heat generated is dissipated from the fan that is in thermal contact with it, and the heat generated by the stator is cooled by the air passing through the duct through the frame, and overall ventilation cooling can be performed. A rotary electric machine with a ventilation cooling function can be configured without increasing the installation space by setting it to a space that can be used for installation, and the outer peripheral part of the fan has a slight gap on the inner peripheral surface of the frame. Since the fans are opened to face each other, dust and dirt contained in the air taken in by the rotation of the fan will not enter the rotor and stator parts. Without, required maintenance for the attachment of dust or dirt, it is possible to reduce the frequency of cleaning.

According to the second aspect of the present invention, since the other end of the heat conducting member, a portion of which is in contact with the rotor, is in contact with the fan, the heat of the rotor is conducted to the fan, and the heat is efficiently dissipated. It is possible to improve the ventilation cooling efficiency.

According to the invention of claim 3, the outside air is sucked into the space between the fan and the side plate or the lid through the suction port by the rotation of the fan, is discharged to the duct through the discharge port, and is discharged to the outside from the duct. An air passage is formed by which the heat of the stator is cooled by the air passing through the duct through the frame, and at the same time, the rotor is ventilated through the ventilation holes formed in the side plate or lid located inside the fan. As a result, the heat generated by the rotor is cooled, and overall ventilation cooling can be performed.Moreover, by setting the duct formation position to a portion that will provide an extra space during vehicle installation, ventilation cooling can be achieved without increasing the installation space. It is possible to configure a rotating electric machine with a function, and moreover, to prevent the cooling air from flowing into the inside of the stator on the side plate or lid, an annular closed Since this section is provided, it prevents the air flow between the vent and the inner circumference of the stator, and the dust and dust contained in the air taken in from the outside by the rotation of the fan inside the stator. Since it does not enter, it is possible to reduce the frequency of maintenance and cleaning required for adhesion of dust and dust.

According to the invention of claim 4, since the other end of the heat conducting member having one end in contact with the heat generating part of the stator is exposed to the duct, the heat of the heat generating part of the stator is conducted to the duct. It can be cooled by the cooling air flowing therethrough, and the cooling effect can be enhanced in combination with the cooling of the frame.

According to the fifth aspect of the invention, since the duct is formed at a place where a space is provided when the truck is attached,
It can be mounted on a trolley without expanding the installation space.

[Brief description of drawings]

1 is a sectional view of a common embodiment of the inventions of claims 1 and 5;

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is a plan view showing a state where the above embodiment is attached to a vehicle bogie.

FIG. 4 is a sectional view of a common embodiment of the inventions of claims 1, 2 and 5;

FIG. 5 is a sectional view of another embodiment common to the inventions of claims 1, 2 and 5;

FIG. 6 is a cross-sectional view of a common embodiment of the inventions of claims 1, 4 and 5;

FIG. 7 is a sectional view of another embodiment common to the inventions of claims 1 and 5;

8 is a sectional view taken along line VIII-VIII in FIG.

FIG. 9 is a sectional view of an embodiment of the invention of claim 3;

FIG. 10 is a sectional view of a conventional example.

FIG. 11 is a cross-sectional view of another conventional example.

[Explanation of symbols]

 1, 1'frame 2 stator iron core 3 coil 4 stator 5 side plate 6,6 'lid 7 bearing device 8 shaft 9 rotor iron core 10 rotor bar 11 end ring 12 rotor 13, 13' space portion 14, 14 'fan 16 suction Mouth 17,17 'Cover 18,18' Duct 19,19 'Discharge port 20,20' Ventilation path 21 Rotating electric machine 22 Beam 23 Nose receiver 24 Nose 25 Foot 26 Axle 27 Coupling 28 Gear device 29 Wheel 32 Heat transfer Member 33 Exposing hole 34 Stator bar 35 Heat conduction member 36 Radiating fin 37 Partition plate 38 Suction port 39 Vent port 40 Closing rib

Claims (5)

[Claims] 1. A stator is attached to an inner peripheral surface of a cylindrical frame, a rotor fitted to a shaft is incorporated in an inner peripheral portion of the stator, and a side plate at one end of the frame and a lid member at the other end. In a rotating electric machine in which axially opposite ends of the shaft are rotatably supported by bearing devices provided at respective central portions, a duct communicating with outside air is formed along an axial direction on an outer peripheral portion of the frame. A side plate or a lid positioned outside the fan by fitting the central part of the fan to the shaft in a state of being in thermal contact with a part of the rotor on the inside of at least one of the side plate and the lid of the frame; The suction port for taking in outside air is formed in the body, and the discharge port for communicating the space between the outer peripheral portion of the fan and the outer peripheral portion of the side plate or the lid located outside the fan with the duct is the frame. of Rotating electrical machine obtained by forming the part. 2. The rotating electric machine according to claim 1, wherein the other end of the heat conducting member, which is in partial contact with the rotor, is in contact with the fan. 3. A stator is attached to an inner peripheral surface of a cylindrical frame, a rotor fitted to a shaft is incorporated in an inner peripheral portion of the stator, and a side plate at one end of the frame and a lid at the other end. In a rotating electric machine in which axially opposite ends of the shaft are rotatably supported by bearing devices provided at respective central portions, a duct communicating with outside air is formed along an axial direction on an outer peripheral portion of the frame. A center portion of the fan is fitted to the shaft on the outside of at least one of the side plate or the lid, and the side plate or the lid located inside the fan is
Forming an air vent for ventilating the rotor, forming an annular closing part for blocking air flow between the air vent and the inner peripheral portion of the stator, and forming a suction port for taking in outside air to the fan. A rotary electric machine having an outlet at the end of the frame for communicating the space between the outer peripheral portion of the fan and the outer peripheral portion of the side plate or lid located inside the fan with the duct. . 4. The rotating electric machine according to claim 1, wherein the heat generating member of the stator is in contact with one end of the heat conducting member and the other end of the heat conducting member is penetrated through the frame to be exposed in a duct. 5. The rotating electric machine according to claim 1, wherein a position where the duct is formed with respect to the frame is a place where a space is provided when the frame is mounted on a vehicle carriage.