JPH07336931A - Rotating electric machine - Google Patents

Abstract

PURPOSE:To improve cooling capacity by providing a frame with an exhaust window, and reducing pressure loss by ventilation, and increasing the quantity of air. CONSTITUTION:This is a rotating electric machine, which has a frame 14 provided with intake and exhaust windows 18 and 17 between the ribs projected inward by drawing and brackets 19 and 20 being set on both sides of this frame and having no window, and in this rotating electric machine, the intake and exhaust areas can be enlarged by taking in air from the intake window of one frame where a baffle plate 11 is attached, and exhausting cooling air from the periphery of the stator iron core to the exhaust window 1 7 of the other frame 14, and besides the areas of the intake window and exhaust window 18 and 17 become the same, so the quantity of cooling air increases, and cooling property improves. Moreover, by adding the above structure to the electric machine having an external fan, cooling air increases, so the quantity of cooling air increases, and cooling property improves.

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 having a frame having an intake / exhaust window and a windowless bracket fitted to the frame.
Regarding what to exhaust.

[0002]

2. Description of the Related Art A conventional technique will be described with reference to FIGS. FIG. 5 is a side view of the rotating electric machine showing the upper half in section,
FIG. 6 is a sectional view taken along line IX-IX in FIG. 5 and 6
In the frame 1, the frame 1 is made of cast metal and has a plurality of ribs 2 in the axial direction.
The inner surface of the rib 2 holds the stator core 3. The ribs 2 form a plurality of ventilation paths 4 in the axial direction between the outer periphery of the stator core 3 and the inside of the frame 1. Brackets 5 and 6 are provided at both ends of the frame 1, respectively, and are provided with an intake window 7 and an exhaust window 8 for ventilation, respectively. Reference numerals 9 and 10 are bearings, and 11 is a baffle plate, which serves to guide the wind generated by the rotor blades 12. 13 is a rotating shaft. In such a configuration, the cooling air is taken in through the intake window 8 of the bracket 6, flows along the outer periphery of the stator core 3 along the arrow, and is exhausted through the exhaust window 7 of the bracket 5.

[0003]

In the conventional rotary electric machine as described above, a pulley (not shown) is attached to the rotary shaft 13, and a radial load or the like due to the belt tension acts. Therefore, the bearing 9 on the load side is the bearing 1 on the anti-load side.
Since the size is generally larger than 0, the area of the exhaust window 7 of the load side bracket 5 is generally smaller than the area of the suction window 8 of the anti-load side bracket 6. For this reason, the pressure loss when the cooling air passes through the exhaust window 7 in the exhaust becomes large, and therefore the amount of the cooling air decreases.

Further, when the thickness of the stator core 3 is long, the pressure loss force when the cooling air flows through the ventilation passage 4 becomes large and the cooling air amount decreases. Therefore, there is a drawback that the cooling property of the rotating electric machine deteriorates.

An object of the present invention is to solve the above problems, and to improve the cooling performance by providing an exhaust window in the frame for reducing the pressure loss due to ventilation and increasing the air volume.

[0006]

According to a first aspect of the present invention, there is provided a rotating electric machine having a frame having a plurality of ribs protruding toward the inner diameter side and extending in the axial direction by drawing, and having intake / exhaust windows provided between the ribs. And a windowless bracket fitted to both sides of the frame, and sucks air from the suction window of one of the frames with a baffle plate installed and cools from the outer periphery of the stator core to the exhaust window of the other frame. It is characterized by exhausting the wind.

According to a second aspect of the present invention, in the rotating electric machine according to the first aspect, the cooling air is provided at one end of the rotating electric machine and is covered with a fan cover, and the cooling air is sent to the inside of the machine to the one end of the rotating shaft. It is characterized by having a fixed external fan fan.

[0008]

In the first aspect, the intake and exhaust areas can be made large, and the intake and exhaust windows have the same area, so that the cooling air volume is increased and the cooling performance is improved. According to the second aspect, the area of the intake air and the exhaust air can be increased, the areas of the windows of the intake air and the exhaust air become the same, and the cooling air by the fan increases, so that the cooling air volume increases and the cooling performance improves.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a side view of a rotary electric machine showing a first embodiment of the present invention in a sectional view of the upper half, and second is a sectional view taken along line II-II of FIG. The same parts as those of the conventional art will be described by using the same reference numerals.

As shown in FIGS. 1 and 2, the frame 14 is made of a plastically workable material such as a steel plate and has a plurality of ribs 15 formed in the axial direction by press working. Holds the iron core 3. The ribs 15 form a plurality of ventilation passages 16 between the outer circumference of the stator core 3 and the frame 14 in the axial direction. The frame 14 is provided with an exhaust window 17 and an intake window 18, and the bracket 1
9 and 20 do not have windows for intake and exhaust. Other configurations are the same as the conventional one.

In the above-mentioned structure, the cooling air sucked through the suction window 18 cools the frame 14 and the ventilation passage 16
The stator core 3 is cooled to be exhausted from the exhaust window 17. Therefore, the intake and exhaust areas are larger than the exhaust windows 7 and 8 of the conventional brackets 5 and 6, and the areas of the intake window 18 and the exhaust window 17 are the same. Therefore, the pressure loss in the exhaust gas is reduced and the cooling air volume is increased, so that the cooling performance of the rotary electric machine is improved. Further, since the brackets 5 and 6 have no window, the frame 14
The rigidity is improved and vibration and noise can be reduced.

Next, a second embodiment of the present invention will be described with reference to FIGS. FIG. 3 is a side view of a rotary electric machine showing a second embodiment of the present invention with its upper half shown in section, and FIG.
It is an IZ battle sectional view. The same parts as in the prior art will be designated by the same reference numerals.

In FIG. 3, one end of the rotary shaft 22 is extended to the outside of the bracket 20, and an external fan fan 23 for generating cooling air is attached. Further, 24 is a fan cover for flowing cooling air generated by the external fan fan 23 to the frame 14 side, and the bracket 25 has a structure in which the fan cover 24 is attached with bolts 26 and has intake and exhaust windows. The frame 14 and the bracket 19 not shown are the same as those in the first embodiment.

In the above structure, the cooling air generated by the rotary shaft 22 and the outer fan fan 23 flows toward the frame 14 by the fan cover 24 and is sucked into the frame 14 through the suction window 18. The cooling air taken in enters the ventilation passage 16 while cooling the rotating electric machine, cools the stator core 3, and is exhausted from the exhaust window 17. Therefore, the areas of intake air and exhaust air are larger than those of the exhaust window 7 and the intake window 8 of the brackets 5 and 6, and the areas of intake air and exhaust air are the same and the external fan 2
The cooling air from 3 is sucked into the rotating electric machine. Therefore, the pressure loss in the exhaust gas is reduced, and the cooling air volume is increased by the outer fan fan 23, so that the cooling performance of the rotating electrical machine is improved and the frame number can be reduced with the same output.

[0015]

As described above, according to the present invention, since the frame is provided with the intake and exhaust windows and the brackets on both sides are not provided with the windows, the pressure loss due to ventilation can be reduced, so that the cooling can be achieved. As a result, the vibration noise can be reduced by improving the rigidity and the rigidity of the rotating electric machine.

Further, by mounting an external fan fan for generating cooling air on the rotary shaft, the cooling air is increased, the cooling performance of the rotating electric machine is further improved, and the frame number can be reduced with the same output.

[Brief description of drawings]

FIG. 1 is a side view of a rotary electric machine showing a cross section of the upper half of the first embodiment,

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

FIG. 3 is a side view of a rotary electric machine showing a cross section of the upper half of the second embodiment;

FIG. 4 is a sectional view taken along line IZ-IZ of FIG.

FIG. 5 is a side view of a rotary electric machine showing a cross section of the upper half of the prior art;

6 is a sectional view taken along line IX-IX in FIG.

[Explanation of symbols]

 1, 14 ...... Frame 2, 15 ...... Rib 4, 16 ...... Ventilation passage 5, 6, 19, 19, 20, 25 ...... Bracket 7, 17 ...... Exhaust window 8, 18 ...... Suction window 11, 21 ...... Baffle plate 12 ... Blades 13, 22 ... Rotating shaft 23 ... Outer fan fan 24 ... Fan cover

Claims (2)

[Claims] 1. A frame having a plurality of ribs protruding toward the inner diameter side by drawing and extending in the axial direction and having intake / exhaust windows between the ribs, and brackets fitted to both sides of the frame and having no window. A rotary electric machine having the above-mentioned rotary electric machine, wherein air is taken in through an intake window of one of the frames to which a baffle plate is attached, and cooling air is exhausted from an outer periphery of the stator core to an exhaust window of the other frame. 2. An outer fan provided at one end of the rotating electric machine and covered with a fan cover, and having an outer peripheral surface of the frame and sending cooling air into the machine and fixed to one end of a rotating shaft. The rotating electric machine described.