JPH10313554A - Cooler for rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the degree of freedoms of a ventilation route of cooling air, by perforating a plurality of third suction ports at a center of the bottom of an air duct between a first suction port and an outer periphery of the duct in the circumferential direction. SOLUTION: An air duct 2A having a first suction port 4A of a cylindrical shape with a bottom formed by opening a center of a bottom 2Aa, and a plurality of third suction ports 20A perforated at a center of the bottom 2Aa between the port 4A and an outer periphery of an air duct 2A is mounted at an opposite load side of a motor 1. When a motor driven fan 5 is driven, cooling air B is sucked from a second suction port 7, and introduced into the port 4A. At this time, a pressure difference occurs between an interior and an exterior of the duct 2A due to movement of the air in the duct 2A, and cooling air BB is sucked from the port 20A. The air BB is combined with the air B to become cooling air BBB, thereby cooling the motor 1. Thus, since the atmosphere can be sucked from the port 20A even in the duct 2A, ventilating area of the cooling are can be increased without altering a profile size of the duct 2A and the fan 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling device for a rotating electric machine with improved cooling performance.

[0002]

2. Description of the Related Art A conventional cooling device for a fully-closed electric motor as a rotating electric machine will be described with reference to FIG. In FIG. 8, the wind tunnel 2 having a first suction port 4 which is formed in a bottomed cylindrical shape and has a bottom center portion opened is attached to the non-load side of the electric motor 1. A ventilation portion 3 is formed between the wind tunnel 2 and the stator frame 13 or the bracket 15, and a cover 6 for covering a cooling fan 9 directly connected to the motor 10 is provided on the side of the first suction port 4 opposite to the motor 1. A fan 5 is fixed to the wind tunnel 2. A second suction port 7 is provided inside the cover 6 of the electric fan 5 on the side opposite to the wind tunnel 2, and an exhaust port 8 is formed on the side of the wind tunnel 2. The cooling fan 9 is located at the first suction port 4 of the wind tunnel 2, generates cooling air by rotation of the electric motor 10, and supplies the cooling air to the first suction port 4. Further, the motor 10 is provided with a terminal box 11 for housing wiring for power supply. The cooling air sucked from the second suction port 7 is sent to the outer periphery of the stator frame 13 and the bracket 15 through the first suction port 4 as shown by the arrow A, to cool the electric motor 1.

[0003]

Generally, the amount of air for cooling the electric motor 1 is expressed by the following equation. Q = A · U However, Q: Air volume (m ³ / min) A: Ventilation area (m ² ) U: Wind speed (min) The cooling device for the electric motor 1 having the above configuration has the following problems.

(1) Since outside air is sucked only from the second suction port 7, a large space for cooling air, that is, a suction space is required near the second suction port 7. Therefore, in the vicinity of the second suction port 7, an obstacle (for example,
There is no wall near the second suction port 7 at the installation location, or other equipment is placed near the second suction port 7), and it is necessary to increase the area occupied by the motor fan 5 in the axial direction. was there.

Further, due to the area occupied by the motor fan 5 in the axial direction, if there is an obstacle near the second suction port 7, the ventilation area decreases. As a result, the amount of cooling air to the motor 1 decreases, the temperature rise of the motor 1 increases, and the deterioration of the insulator and the bearing 1
There has been a problem that the life of the electric motor 1 is shortened by inducing abnormalities of 8, 19 and the like. When the motor 1 is evaluated in the same facility, when the difference between the in-house test of the producer and the facility actually used is large (a large difference in ventilation space), the predicted temperature rise value of the producer and the actual use are used. Are different from each other, and there is a possibility that an unexpected incompatibility of the electric motor 1 occurs.

(2) The electric motor 1 constituting the electric motor fan 5
0, the terminal box 11 is attached, so that when the cooling air passes through the inside of the cover 6, the ventilation area is small, and the outer diameter Φ of the cover 6
It was causing an increase in d1.

When it is necessary to increase the size of the motor fan 5 in order to increase the cooling air flow, the outer diameter Φd1 of the cover 6 and the diameter Φd2 of the exhaust port 8 are made smaller than the outer diameter ΦD of the wind tunnel 2. That is, there were the following constraints.

ΦD> Φd1, diameter Φd2 Therefore, when selecting the motor fan 5, it is necessary to consider not only the air volume but also the condition of the external dimensions. Therefore, it is necessary to consider a restriction condition for an increase in the air volume of the motor fan 5 with an increase in the capacity of the motor 1. Conversely, when the capacity of the motor fan 5 is increased, the size of the wind tunnel 2 is increased, and as a result, this is one factor for increasing the size of the motor 1.

(3) Further, in order to obtain the same cooling air volume and to reduce the outer diameter Φd1 of the cover 6, it becomes impossible to arrange the terminal box 11. As a result, the cable of the electric motor 10 and
There is no storage for the external power cable wiring,
It was difficult to shut off the cable wiring from the outside air.

(4) As a method for increasing the amount of cooling air,
There is a method of increasing the outer diameter of the cooling fan 9. In the prior art, the outer diameter Φda of the cooling fan 9 is equal to the outer diameter Φd1 of the cover 6.
Make it smaller. That is, there were the following constraints.

Φda <Φd1 Therefore, in selecting the cooling fan 9, it is necessary to consider not only the air volume but also dimensional constraints.

(5) Air volume generated by the motor fan 5;
The relationship between the outputs of the electric motor 1 is expressed by the following equation. Lt = Q · Pt / k, where Lt: power (W) (output of electric motor 10) Q: (m ³ / min) Pt: total pressure (Pa) k: constant The output of electric motor 10 is maintained at a predetermined capacity. Therefore, it is necessary to adjust the ventilation area. With the conventional technology, it is not possible to adjust each intake / exhaust port, so it is necessary to calculate the intake / exhaust port in advance using an empirical formula to determine the ventilation area, and further confirm that the actual equipment is as designed. was there. Therefore, the electric motor 1
It was necessary to evaluate the motor 10 when the same motor fan 5 was adopted for the model change of 0 or the motor 1 having a different wind tunnel 2. For example, when the cooling air volume becomes larger than a predetermined value, overload operation of the electric motor 10 is induced to cause a reduction in the life or an increase in the size of the electric motor 10.

(6) Further, since the cooling air is exhausted from the ventilation section 3 of the electric motor 1, when the air volume is increased, the outside diameter ΦD of the wind tunnel 2 is increased to increase the inner circumference, thereby increasing the ventilation area. 3 increase the area. Therefore, the radial dimension of the electric motor 1 is increased, and the occupied area of the electric motor 1 in the equipment is increased. In the case of the same air volume according to the above-mentioned air volume formula, the wind speed increases when the ventilation area is small. If the wind speed is too high, the effect of cooling air on peripheral equipment (eg, dust,
Dust, etc.) and increased noise such as wind noise may cause environmental pollution.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and an object of the present invention is to improve the degree of freedom of a cooling air passage for cooling a rotating electric machine. Accordingly, a cooling device for a rotating electric machine capable of widely receiving a request for the rotating electric machine from the entire system in which the rotating electric machine is installed is provided.

[0015]

According to a first aspect of the present invention, there is provided a cooling apparatus for a rotating electric machine, wherein
An electric fan comprising a wind tunnel having a suction port and a cover for covering a cooling fan directly connected to the electric motor, wherein the wind tunnel is arranged on the non-load side of the rotary electric machine such that the first suction port is on the anti-rotating electric machine side. The cooling device for a rotary electric machine, wherein the cooling fan is located outside the first suction port, and the electric fan is fixed to the outer edge of the first suction port of the wind tunnel and has a second suction port on the side opposite to the wind tunnel in the cover. A plurality of third suction ports are formed in the circumferential direction between the first suction port and the outside diameter of the wind tunnel at the center of the bottom of the wind tunnel.

According to this configuration, the third intake port is provided at the bottom of the wind tunnel and on the electric fan mounting surface, and outside air can be taken in from the third intake port also in the wind tunnel by using the cooling air generated by the operation of the electric fan. The ventilation area of the cooling air can be increased without changing both the size and the electric fan. Thus, the area occupied by the rotating electric machine in the axial direction in the entire system is small, and even if there is some obstacle in the second intake port of the electric fan, the intake area required for cooling can be secured. As a result, the temperature rise can be reduced, so that the rotating electric machine can be downsized and space can be saved.

According to a second aspect of the present invention, a plurality of fourth suction ports are formed in the body of the wind tunnel in the circumferential direction by forming a half-drained air guide plate. With this configuration, the intake area can be increased by the fourth intake port without providing an intake port on the mounting surface of the electric fan in the wind tunnel or increasing the outer diameter of the electric fan (outer diameter of the cooling fan). Therefore, the conditions for selecting an electric fan can be expanded. As a result, the capacity of the electric fan can be increased, and the rotating electric machine can be reduced in size and lengthened in life by increasing the amount of cooling air.

According to a third aspect of the present invention, the half-blowed air guide plate projects outside or inside the wind tunnel, and there is no protrusion of the wind guide plate on the inner periphery of the body, so that the cooling air can be uniformly distributed in the circumferential direction of the rotating electric machine. Supply can be performed, and partial overheating can be suppressed.

A fourth aspect of the present invention is characterized in that a plurality of fifth suction ports are formed by forming a semi-opening air guide plate projecting into the cover in the circumferential direction of the cover, and the cooling air is blown by the terminal box in the electric fan. The intake area can be ensured despite the factors that hinder the flow of air. This facilitates the miniaturization of the electric fan by reducing the outer diameter of the cover and the quality improvement by installing the terminal box of the electric fan motor.

According to a fifth aspect of the present invention, the cooling fan of the electric fan is disposed in a wind tunnel inside the first suction port. The flow of the cooling air is the same as that of the first aspect, but the outer diameter of the cooling fan is reduced. The size of the cover can be made larger, the amount of cooling air can be increased, and the axial dimension of the cover can be reduced. As a result, the entire wind tunnel including the electric fan can be downsized, and the entire rotating electric machine to which the wind tunnel is attached can be downsized.

According to a sixth aspect of the present invention, a partition plate is provided outside each of the suction ports. With this configuration, the opening of the third suction port can be adjusted, and the amount of cooling air can be adjusted. It is also possible to adjust the wind speed accompanying the air volume adjustment.

Further, a plurality of outlets are provided in the circumferential direction of the body of the wind tunnel and the outlets are covered with a discharge plate. Cooling air is sucked from the second inlet and the first inlet. After entering the mouth, it is diverted and discharged to the ventilation section and the exhaust port, and the discharge area can be increased. Further, the cooling air can be guided to the rotating electric machine by the discharge plate. By using this configuration, it is possible to increase the discharge area without increasing the outer diameter of the wind tunnel even when the air volume is increased as in the first to fourth aspects.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIG. FIG. 1 is an upper half longitudinal sectional view and a left side view showing a first embodiment of the present invention. In the drawing, a cylindrical portion with a bottom and an opening at the center of a bottom 2Aa is provided on the non-load side of a motor 1 as a rotating electric machine. Formed first suction port 4A, and this first suction port 4A
At the center of the bottom 2Aa of the wind tunnel 2A and the outer diameter of the wind tunnel 2A, a wind tunnel 2A having a plurality of third suction ports 20A formed in the circumferential direction is attached to a seat 15A of the bracket 15. A ventilation section 3 is provided between the wind tunnel 2A and the stator frame 13 or the bracket 15.
An electric fan 5 composed of a cover 6 covering a cooling fan 9 directly connected to the electric motor 10 is fixed to the wind tunnel 2A on the side opposite to the electric motor 1 of the first suction port 4A. And
Inside the cover 6 of the electric fan 5, a second suction port 7 is provided on the side of the wind tunnel 2A, and an exhaust port 8 is formed on the side of the wind tunnel 2A. The electric fan 5 and the wind tunnel 2A constitute a cooling device.

The cooling fan 9 is located outside the first suction port 4A of the wind tunnel 2A, and generates cooling air by rotation of the electric motor 10 to supply the cooling air to the first suction port 4A. or,
The electric motor 10 has a terminal box 11 for accommodating wiring for power supply.
Are arranged. Then, when the electric fan 5 is driven, cooling air B as indicated by an arrow B is sucked from the second suction port 7 and enters the first suction port 4A. At this time, the movement of the air in the wind tunnel 2A causes a pressure difference between the inside and the outside of the wind tunnel 2A, and the cooling air B as indicated by an arrow BB from the third suction port 20A.
B is sucked and merged with the cooling air B to form a cooling air BBB, which is sent to the outer periphery of the stator frame 13 and the bracket 15 to be driven by the electric motor 1.
Has cooled.

With this configuration, the third suction port 20A is provided at the bottom of the wind tunnel 2A and on the mounting surface of the electric fan 5, and the cooling air B generated by the operation of the electric fan 5 is used to open the outside air from the third suction port 20A at the wind tunnel 2A. Since the intake air (cooling air BB) can be generated, the ventilation area of the cooling air can be increased without changing both the external dimensions of the wind tunnel 2A and the electric fan 5. As a result, the area occupied by the motor 1 in the axial direction in the entire system is reduced,
Even if there is some obstacle in the second intake port of the electric fan 5, the intake area necessary for cooling can be secured. As a result, the rise in temperature can be reduced, the motor 1 can be downsized, and space can be saved. In addition, the influence of the arrangement of devices in the entire system is eliminated, and the difference between the prediction of the producer of the electric motor 1 and the actual machine is small, and the quality can be improved. Furthermore, the reduction in temperature rise makes it possible to deteriorate the insulation and extend the grease life of the bearing, so that the quality of use is improved and the life of the electric motor 1 is extended.

(Second Embodiment) FIG. 2 shows a second embodiment of the present invention, and a difference between the second embodiment and the first embodiment will be described. A plurality of half-blowed air guide plates 21a are formed in the circumferential direction on the outer periphery of the trunk portion 20B forming the wind tunnel 2B while being inclined and protruded in the wind tunnel 2B so that the cut side is on the side of the electric motor 1. A fourth suction port 20Ba is formed in the body 20B by the air guide plate 21a. When the electric fan 5 is driven, the cooling air C as indicated by the arrow C flows from the second suction port 7.
Is sucked into the first suction port 4B. At this time, wind tunnel 2B
Due to the movement of the air inside, a pressure difference occurs between the inside and the outside of the wind tunnel 2B, and the cooling air CC as indicated by an arrow CC is sucked from the fourth suction port 20Ba, and merges with the cooling air C to become the cooling air CCC. The motor 1 is fed to the outer periphery of the stator frame 13 and the bracket 15 to cool the motor 1.

With this configuration, the electric fan 5 of the wind tunnel 2B
Even if the suction port is not provided on the mounting surface of the
Even if the outer diameter of the fan (outer diameter of the cooling fan) is not increased, the intake area can be increased by the fourth suction port, so that the conditions for selecting the electric fan 5 can be expanded. As a result, the capacity of the electric fan 5 can be increased, and the size of the electric motor 1 can be reduced and the service life can be extended by increasing the amount of cooling air.

(Third Embodiment) FIG. 3 shows a third embodiment of the present invention, and a difference between the third embodiment and the second embodiment will be described. A plurality of semi-blowed air guide plates 21b are formed on the outer periphery of the trunk 21C forming the wind tunnel 2C in the circumferential direction while projecting outside the wind tunnel 2C and inclining so that the cut side is on the anti-motor 1 side. Then, a fifth suction port 20C is formed in the body 21C by the air guide plate 21b. The cooling air flow is the same as that in the second embodiment, but there is no protrusion of the air guide plate 21b on the inner periphery of the body 21C, so that uniform cooling air can be supplied in the circumferential direction of the electric motor 1 and partial overheating can be achieved. Can be suppressed.

(Fourth Embodiment) FIG. 4 shows a fourth embodiment of the present invention, in which a half-blowed air guide plate 21C projecting into the cover 6A in the circumferential direction of the cover 6A of the electric fan 5A is formed. Then, a plurality of fifth suction ports 20D are formed by the air guide plate 21C. The fifth suction port 20 </ b> D is located at a position facing the terminal box 11 of the
Place it on the side. When the electric fan 5 </ b> A is driven, the cooling air E as indicated by an arrow E from the second suction port 7.
Is sucked, and the cooling air EE also flows from the fifth suction port 20D.
Is sucked into the first suction port 4B. Then, the air intake area can be ensured irrespective of the factor that hinders the flow of the cooling air by the terminal box 11 in the electric fan 5A. This allows
The electric fan 5A can be downsized by reducing the outer diameter of the cover 6A, and the quality can be easily improved by installing the terminal box 11 of the electric motor 10.

(Fifth Embodiment) FIG. 5 shows a fifth embodiment of the present invention, and the difference between the fifth embodiment and the first embodiment will be described. The cooling fan 9B of the electric fan 5B is disposed in the wind tunnel 2A inside the first suction port 4A. Although the flow of the cooling air is the same as that of the first embodiment, the fan outer diameter of the cooling fan 9B can be made larger than that of the cover 6B, so that the amount of cooling air can be increased and the axial dimension of the cover 6B can be shortened. As a result, the entire wind tunnel 2A including the electric fan 5B can be downsized, and the entire motor 1 to which the wind tunnel 2A is mounted can be downsized.

(Sixth Embodiment) FIG. 6 shows a sixth embodiment of the present invention. A case where the sixth embodiment is applied to the first embodiment will be described. One screw hole is provided near the third suction port 20A of the wind tunnel 2A, and one screw hole 23 of the same size is provided in the partition plate 22. And the outer surface of the partition plate 22 (on the counter wind tunnel 2A side)
The nut 24, the partition plate 22, and the wind tunnel 2A are mounted with bolts 25. Wind tunnel 2A and partition plate 22
When adjusting the axial gap L, the bolt 25 is loosened, and after adjusting the L dimension, the partition plate 22 is fixed to the bolt 25 with the nut 24. Further, when adjusting the opening area H of the third suction port 20A, it becomes possible by rotating the partition plate 22 around the screw hole 23.

With this configuration, the opening of the third suction port 20A can be adjusted and the cooling air volume can be adjusted. It is also possible to adjust the wind speed accompanying the air volume adjustment. (Seventh Embodiment) FIG. 7 shows a seventh embodiment of the present invention.
5 at the position near the seat 15A in the circumferential direction.
Is provided. The exhaust port 26a is covered with a discharge plate 27. Then, when the electric fan 5 is driven, the cooling air G as shown by the arrow G is sucked from the second suction port 7 and enters the first suction port 4B, and the ventilation part 3D and the exhaust port 26a
And discharged, and the discharge area can be increased. Further, the cooling air G can be guided to the electric motor 1 by the discharge plate 27. By using this configuration, even when the air volume is increased as in the first to fourth embodiments, the discharge area can be increased without increasing the outer diameter of the wind tunnel 2D. If a plurality or all of the above embodiments are used in combination, the above characteristics or the above characteristics can be obtained.

[0033]

As described above, according to the present invention, the amount of cooling air can be increased without changing the external dimensions of the wind tunnel or the electric fan, so that the entire rotating electric machine can be reduced in size and space. In addition, the cooling performance is improved, and the life of the rotating electric machine can be extended. In addition, since it is hard to be influenced by installation conditions due to the intake of cooling air from the rotating electric machine, a difference between a maker test at the time of production and an actual machine is reduced, leading to a stable quality. Further, since the air volume can be easily adjusted, overload of the electric fan can be prevented. By adjusting the air volume, the wind speed can be adjusted, and the noise can be reduced.

[Brief description of the drawings]

FIG. 1 is an upper half longitudinal sectional view and a left side view of a rotating electric machine showing a first embodiment of the present invention;

FIG. 2 is a view corresponding to FIG. 1 showing a second embodiment of the present invention,

FIG. 3 is a view corresponding to FIG. 1, showing a third embodiment of the present invention;

FIG. 4 is a view corresponding to FIG. 1, showing a fourth embodiment of the present invention;

FIG. 5 is a view corresponding to FIG. 1, showing a fifth embodiment of the present invention;

FIG. 6 is a sectional view and a plan view showing a sixth embodiment of the present invention;

FIG. 7 is a view corresponding to FIG. 1, showing a seventh embodiment of the present invention;

FIG. 8 is a diagram corresponding to FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Rotating electric machine (motor), 2, 2A, 2B, 2C, 2D ... Wind tunnel, 4, 4A, 4B, 4C, 4D ... 1st inlet, 5, 5A, 5B ... Electric fan, 6, 6A, 6B ... Cover, 7, 7A, 7B: second suction port, 9, 9A: cooling fan, 10: electric motor, 20A: third suction port, 20B: fourth suction port, 20C: fifth suction port, 20D: sixth suction Ports, 21a, 21b, 21c: air guide plate, 22: partition plate, 26: exhaust port, 26a: seventh suction port, 27: discharge plate.

Claims (7)

[Claims] 1. An electric fan comprising a wind tunnel having a bottomed cylindrical shape having a first suction port at the bottom center and a cover for covering a cooling fan directly connected to the motor, wherein the first suction port is located on the side opposite to the rotating electric machine. The wind tunnel is arranged on the non-load side of the rotating electric machine so that
A cooling device for a rotating electric machine, wherein the cooling fan is located outside a first suction port, an electric fan is fixed to a first suction port outer edge of the wind tunnel, and a second suction port is provided on a side opposite to a wind tunnel in a cover.
A cooling device for a rotating electric machine, wherein a plurality of third suction ports are formed in a circumferential direction between the first suction port and an outer diameter of the wind tunnel at a bottom central portion of the wind tunnel. 2. An electric fan comprising a wind tunnel having a bottomed cylindrical shape having a first suction port at the bottom center and a cover for covering a cooling fan directly connected to the motor, wherein the first suction port is located on the side opposite to the rotating electric machine. The wind tunnel is arranged on the non-load side of the rotating electric machine so that
A cooling device for a rotating electric machine, wherein the cooling fan is located outside a first suction port, an electric fan is fixed to a first suction port outer edge of the wind tunnel, and a second suction port is provided on a side opposite to a wind tunnel in a cover.
A cooling device for a rotating electric machine, wherein a plurality of fourth suction ports are formed in a circumferential direction in a body portion of the wind tunnel by forming a half-drained air guide plate. 3. The cooling device for a rotating electric machine according to claim 2, wherein said half-blanked wind guide plate projects outside or inside the wind tunnel. 4. An electric fan comprising a wind tunnel having a bottomed cylindrical shape having a first suction port at the bottom center and a cover for covering a cooling fan directly connected to the motor, wherein the first suction port is on the side opposite to the rotating electric machine. The wind tunnel is arranged on the non-load side of the rotating electric machine so that
A cooling device for a rotating electric machine, wherein the cooling fan is located outside a first suction port, an electric fan is fixed to a first suction port outer edge of the wind tunnel, and a second suction port is provided on a side opposite to a wind tunnel in a cover.
A cooling device for a rotating electric machine, wherein a plurality of fifth suction ports are formed by forming a half-opening air guide plate projecting into the cover in a circumferential direction of the cover. 5. The cooling device for a rotating electric machine according to claim 1, wherein the cooling fan of the electric fan is disposed in a wind tunnel inside the first suction port. 6. The cooling device for a rotating electric machine according to claim 1, wherein a partition plate is provided outside each of said suction ports. 7. An electric fan comprising a wind tunnel having a bottomed cylindrical shape having a first suction port at the bottom center and a cover for covering a cooling fan directly connected to the motor, wherein the first suction port is located on the side opposite to the rotating electric machine. The wind tunnel is arranged on the non-load side of the rotating electric machine so that
A cooling device for a rotating electric machine, wherein the cooling fan is located outside a first suction port, an electric fan is fixed to a first suction port outer edge of the wind tunnel, and a second suction port is provided on a side opposite to a wind tunnel in a cover.
A cooling device for a rotating electrical machine, wherein a plurality of outlets are provided in a circumferential direction of a trunk of the wind tunnel, and the outlets are covered with an outlet plate.