JPS59226635A - Rotary electric machine - Google Patents

Abstract

PURPOSE:To facilitate the manufacture of a rotary electric machine and to improve the cooling effect of the machine by varying the heights of projecting strips so that the projections of the projecting strips becomes polygonal when wound in a cylindrical shape, winding a plastically formed steel plate on the periphery of a stator core and welding them. CONSTITUTION:A steel plate S is bent in a waveshape to form projecting strips, a bottom side is aligned on a straight line (l), the top sides of the strips are set in height to H, H2, H1 and the tops 2, 2b, 2a are formed. The plate S for forming the strips is rounded in a cylindrical shape to form a cylindrical frame 1a which is matched to a stator core 4, tops 2a, 2b, 2, 2b, 2a are aligned to a straight line to form one side of the polygonal shape (octagonal shape in the drawing), thereby forming a regular polygonal shape 35. A stator core 4 is inserted into a stator frame 1a, clamped by a clamping band, and the projected bottom and the stator core are welded at 6.

Description

Detailed Description of the Invention [Technical Field of the Invention] The present invention relates to adjacent fin protrusions of a stator frame of a totally enclosed external fan-shaped rotating electrical machine, which is formed into a radially cylindrical radially cylindrical shape with fin protrusions made by bending a plate of a good thermal conductor. This invention relates to a rotating electrical machine in which the bottom inner periphery of a stator frame whose tip outer circumference is formed into a convex polygonal shape and the outer periphery of a stator core are laminated.

[Technical background of the invention and its problems]

Figure 1 is a cross-sectional view of the upper half of a completely enclosed external fan-shaped rotating electrical machine with a conventional structure, Figure 2 is a cross-sectional view taken along the line n-M in Figure 1, and Figure 3 is a conventional stator fixed in a frame. This is a cross-sectional view of the main part showing the manufacturing process of inserting the child core and tightening it with a fastening band.
In the conventional configuration shown in FIGS. 2 and 3, a stator frame 1 of a rotating electric machine has a plurality of fin protrusions 2 (hereinafter abbreviated as protrusions 2) made by bending a steel plate with good thermal conductivity into a wave shape in the axial direction. The steel plate provided with the protrusions 2 is rolled into a cylindrical shape, and the tangent line connecting the top ends of the protrusions 2 and the adjacent protrusions 2 is circular.The protrusions 2 are each radially shaped. Formed in a protruding manner. Thus, the stator core 4 in which the stator winding 8 is wound within the cylindrical stator frame 1 is fixed as shown in the cutaway sectional view of the main part of the stator core in the stator frame in FIG. Insert into child frame 1,
Tightening with a tightening band 26 is provided by welding the bottom part 5 of the stator frame 1 with a welding band 6, respectively. Further, both ends 7 of the stator frame 1 in the axial direction are provided by welding a ring 9 formed by processing the spigot 8, and both ends 10 of the plurality of protrusions 2 are closed at weld temples, and the axial direction of the protrusions 2 is closed. An inside air ventilation passage 11 is formed between the stator core 4 on the inside, and an outside air ventilation passage 12 is formed on the outside between the protrusions 2 in the axial direction.

Reference numeral 18 denotes a rotor core having a plurality of ventilation holes 14 in the axial direction, which is shrink-fitted to the rotor shaft 16, and inner rings of bearings 16 are fitted to both ends of the rotor shaft 15. are rotatably supported by bearing brackets 18 on both sides via bearings 16 at both ends of the rotor shaft 15, with the inner diameter of the stator core 4 separated by a gap 17. The bearing brackets 18 on both sides are fitted into the spigots 8 of the cylinders 9 at both ends of the stator frame 1 and fixed by tightening with ports 19. An inner fan 20 is fixed inside the device on the opposite side of the rotor shaft 15, and an outer fan 21 is fixed to the end of the rotor shaft 15, and the outer fan 21 is covered with a fan cover 22. In the operation with the above-mentioned fully enclosed external fan-shaped rotation*m configuration, the inside air is moved from the end of the stator winding 8 through the inside air ventilation path 11 by the action of the inside fan 20 to the stator winding 8 on the p load side, as shown by the arrow 28. bypass the edge,
The heat generated inside the device is transferred to the inside air 25 by the inside air circulating ventilation that flows through the ventilation hole 14 of the rotor core 4 toward the anti-load side, and is then transferred to the two groups of ridges of the stator frame 1. Further, the heat generated from the stator core 4 is directly transmitted through the welded portion 6 between the bottom portion 5 of the stator frame 1 and the stator core 4. On the other hand, the outer fan 21
As a result, outside air cooling air 12a is generated in the direction of the arrow 24, and is vented to the outside air ventilation path 12 between the protrusions 2 of the stator frame 1, and removes the heat transferred to the bottom part 5 of the stator frame 1, thereby forming a completely closed type. Cools the entire rotating electric machine.

In the manufacturing process of the cylindrical stator frame 1 provided with the protrusions 2 of the conventional fully enclosed external fan-shaped rotating electric machine described above, as shown in FIGS. 8 and 4, the protrusions 2 of the stator frame 1 are adjacent to Suru IJ#!
The tangent connecting the top ends of the protrusions 2 is tightened with a fastening band 26, and the bottom 5 of the stator frame 1 and the outer periphery of the stator core 4 are welded at the welding part 6. band 26
The pressing force P that presses the bottom part 5 of the stator frame 1 against the outer periphery of the stator core 4 is applied to the tightening band 26 on the center line of the protrusion.
Tension T acts on the left and right sides in the tangential direction of the top end of the protrusion 2,
Note that the pressing force P from the angle θ formed by these two tension forces T is p: 2 X T C0II #/2
(t) Given by equation (1). Here, since the abutment of the adjacent protrusions 2 is the same, the pressing force P is as follows.

Furthermore, for heat transfer from the inside air 25 of the equipment to the fixed frame 1 and heat transfer from the protrusion 2 to the outside air, it is better to have a larger surface area of the protrusion 2, but since the height H of the protrusion 2 is constant, the protrusion 2 In order to increase the surface area of
1 becomes small, so even if the tension T is made larger than the pressing force P in equation (2) above, the pressing force P cannot take a very large value. Note that if the central angle θ1 is too small, the outside air ventilation path 12 described above will become narrow, and the amount of cooling air passing through the outside air ventilation path 12 will decrease, and heat transfer from the ridges 2 to the outside air will become insufficient. The central angle θ1 between the protrusion 2 and the protrusion 2 is usually about 5°≦θ≦10°. In this case, from equation (2) above, the relationship between the tightening force P and tension is approximately 0.09.
T≦P≦0.17T. Therefore, when the central angle θ1 between the protrusions 2 is in the normal range of about 5' to 10', the fastening band 2
Even if the tension T of 6 is increased, the pressing force P is only about 9 to 17 inches of the tension T of the fastening band 26, as shown in the characteristic diagram of the relationship between the tension T of the fastening band 26 and the pushing force P in FIG. The reality is that it will not increase.

Similarly, in order to insert the stator core 4 into the stator frame 1 in which a plurality of protrusions 2 have been plastically processed (=, the inner diameter of the stator frame 1 is 80
is formed to be larger than the outer diameter 31 of the stator core 4, and after inserting the stator core 4 into the stator frame 1, the stator frame 1 is tightened to the outer periphery of the stator core 4 with the fastening band 26, and the stator frame The gap 32 between the inner periphery of the bottom 5 of the stator 1 and the outer periphery of the stator core 4 is slightly suppressed to ensure stable mutual welding. In frame J,
The central angle θ1 between the protrusions 2 is 5@ to 10°, and for example, the tension T of the fastening band 26 is 250k) and 500kp.

1.000 k#, 1,500 k) was calculated from the above equation (2) and shown in Table 1.

Table 1 As mentioned above, the tension T of the fastening band is changed from 250Kt to 1
Even if the pressure is gradually increased to 500 kf, the pressing force (P) is approximately 8.7 to 17.4 cm with respect to the tension T of the fastening band.
% of the pressing force P, and the conventional fastening band 26
Even if the stator frame 1 is tightened through the ends, the outer circumference of the top end of the protrusion 2 will be uneven and the inner circumference of the bottom part 5 of the stator frame 1 will be deformed into an oval shape, as shown in FIG. , gaps 82 are generated at multiple locations between the stator core 4 and the stator core 4 . If an attempt is made to weld the bottom portion 5 and the stator core 4 with this gap 82 present, the gap 82 will be large, making the welding condition unstable, and it will be difficult to reliably fill the gap 32 with weld metal. When assembled into a rotating electric machine in this way, the gap 82 is not reliably filled with molten 7F metal, so heat transfer from the stator core 4 to the stator frame 1 is insufficient, resulting in an abnormal temperature rise. It had the disadvantage of causing From the above, it is possible to increase the welding voltage and welding current conditions before welding, lengthen the welding time, and fill the gap S2 with the welding pot metal, but the abnormally high welding heat generated during welding can cause stator core 4 There is a drawback that distortion occurs in the stator core 4 due to the transmission of the strain. Further, since welding heat is transmitted to the stator winding 8 and deteriorates the insulation of the stator winding 8, there is a drawback that the gap 32 cannot be filled with welding pot metal.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned reasons, improves the conventional drawbacks, reduces the gap between the inner periphery of the stator frame and the stator core, stabilizes the welding state, and improves quality and cooling. The purpose of this invention is to provide a rotating electrical machine with improved performance.

[Summary of the invention]

In order to achieve the above object, the present invention applies plastic stress to a steel plate provided with protrusions so that it becomes a convex polygon when wound into a cylindrical shape. A stator core is formed by forming a frame, winding a fastening band around the top end of the longest protrusion in the radial direction of each apex angle of the convex polygon, and inserting the inner periphery of the stator frame by tightening the fastening band. In close contact with
Conventionally, welding increases rigidity by reducing the occurrence of gaps, and improves cooling through heat transfer from the stator core to the stator frame.

[Embodiments of the invention]

An embodiment of the present invention shown in the drawings will be described below.

FIG. 5 is a sectional view of a main part of a stator showing an embodiment of the present invention;
Figure 6 is an enlarged cross-sectional view of the main parts of the protrusions in Figure 5, and Figure 7 is a stator core with the convex polygonal (octagonal) stator frame in Figure 5 rounded into a cylindrical shape and fastened with a fastening band. It is an explanatory view of tightening the outer periphery of.

However, parts that are the same as those in the prior art described above are designated by the same reference numerals and detailed explanations will be omitted. Conventionally, when plastically working the protrusions 2 on the stator frame 1 using a steel plate material, a plate thickness of approximately 3.2 mm was used, the pitch between the protrusions 2 was approximately 80 cages, and the gap between the protrusions 2 was Approximately 20EI
11 is the limit, select a size larger than that.

As shown in FIG. 6, the stator frame 1a of the present invention has a plurality of protrusions 2, 2b, and 2c of different cylindrical lengths and heights H selected and arranged as shown below, and mounted on a steel plate 84. The stator frame 1 is plastically worked so that the bottom part 5 between the protrusions is rounded into a cylindrical shape, and the top ends of the protrusions 2a, 2b, and 2c have a convex polygon 85 (octagon), for example.
form. In FIG. 5, for example, the outer diameter 88 of the stator core 4
In the case of about 500 m, a protrusion 2 with a height H of about 60 layers is arranged on the center line of the center angle with 84 circumferences, and the center angle of the center line of the protrusion 2 is 22.5°. The negative side of the convex polygon 85 (octagon) whose side is the virtual tangent connecting the intersection of the extension line of the two sides and the tangent of the top end of the protrusion 2 is approximately 257 $11, and the convex polygon (octagon) The height of the protrusion 2a located on the radiation line is H
In this case, it is about 85 thighs. Therefore, the tangents connecting the apexes of the radial protrusions 2a located at the apex angle α1 on both the left and right sides of the protrusion 2 with the height H described above are at heights H and H2 along the convex polygon 35 (octagon). Multiple radial protrusions 2, 2 of ゜Hl
As shown in FIG. 6, a plurality of stator frames b and 2a are formed on a steel plate 84 by plastic working, and a stator frame 1a is provided which is rounded into a cylindrical shape that matches the outer circumference of the stator core 4. is 45°
A stator frame 1 in which protrusions 2a and 2a are arranged on the radiation line, and a tangent line connecting the vertices of the protrusions 2a is a convex polygon 85 (octagon)
form.

Then, the stator core 4 is inserted into the stator frame 1a described above, tightened with the fastening band 26, and the inner periphery of the bottom 5 of the stator frame 1a is pressed against the outer periphery of the stator core 4 and welded to the welded part 6. Fix it with. In the structure of the stator frame 1a of the convex polygon 85 (octagon) of the rotating electric machine configured as described above,
Next, the effects will be explained. As shown in FIG. 7, when the stator frame 1a is fastened to the stator core 4 with the fastening band 26, the pressing force P at the protrusion 2a of the convex polygon 85 (octagon) with the apex angle α1 is as follows. Calculate using equation (4). In addition, a parallelogram is created by drawing parallel lines 40a on each of the two sides 40 that sandwich the apex angle α1 of the protrusion 2a, and a protrusion 42 m
The apex angle 42 of the isosceles triangle whose base is one side on the center line of the apex angle α1 is 45', and the base is the side 40 connecting the protrusion 2a of the apex angle and the adjacent protrusion 2a, and The center angle α of an isosceles triangle whose two sides are the center line of the apex angle α1 is in an equal relationship. From the above, the pressing force P is the tension T of the fastening band 26 and the apex angle α of the convex polygon (octagon).
1, but since the central angle α between the protrusions 2a and 2a is greater,
Equation (3) is equivalent to equation (4), and the pressing force P can be calculated.

α p=2
is 45°, and the tension T of the fastening band 26 that tightens between the top ends of the protrusion 2+1 and the adjacent protrusion 8a is expressed as 2509 and 50°.
The pressing force P in the case of 0kf and 1ρ0Okf is shown above (
4) is shown in Table 2, and FIG. 8 shows a characteristic diagram showing the relationship between the tension T of the fastening band 26 and the pressing force against the protrusion of a convex polygon (N-gon). (The center angle of the N-gon is 10” to 90°) Table 2 Pressing force [Unit q] As described above, the protrusions 2a and 2a of the stator frame 1a of a plurality of convex polygons 85 (octagons) The central angle between them is 45°,
The tension of the fastening band 26 that tightens the top end of the protrusion 2a is 50
In the case of 0, the pressing force P is approximately 883 kl, and it is possible to tighten with a large pressing force P of approximately 76.5'l relative to the tension T of the fastening band 26.

In addition, the tension T of the fastening band 26 is 250 k and 1000 k.
The pressing force P in the case of f is about 191 kf and 765 kf.

From the above, when the central angle between the protrusions 2 of the conventional cylindrical stator frame 1 is 5'' to 10°, the tension T of the fastening band
When the pressure is 500 kl, the pressing force P to tighten the top end of the protrusion 2 is about 44 to 87 #, and the pressing force P to tighten the top end of the protrusion 2 is about 9 to 87 cm for the tension of the fastening band T 50Q kIi. Since it is approximately 17%, the pressing force P for tightening the top end of the protrusion 41e 1 m of the stator frame 1a of the convex polygon 85 (octagonal) of the present invention is 88811#, and the pressing force P is 88811# compared to the conventional case. is increased by approximately 295 kl, and the pressing force P against the tension 'I' of the fastening band 26 of 500 kpi is approximately 43 cm. Tightening can be modified. For this reason, the tension T of the fastening band 26 that tightens the protrusion 2a of the stator frame 1a of the convex polygon 85 (-octagon) of the present invention is
is about 500 kl, and the pressing force P at the top of the protrusion 2a is about 8
88 kl acts on the tips of each of the plurality of protrusions 2 (the center angle between the protrusions 2a is 45°), so that the inner periphery of the stator frame 1a at the bottom 5 between the protrusions is aligned with the stator core 4. Since the #1 layer can be firmly formed at the welded portion 89 by being pressed against the outer periphery of the rotary electric machine, it has the effect of increasing the heat dissipation effect by heat transfer from the stator core 4 to the group of protrusions 2a of the stator frame 1a of the rotating electric machine.

From the above, in the conventional cylindrical stator frame 1 that connects the tips of the protrusions 2 and the tips of the protrusions 2, when the top end of the protrusions 2 is tightened with the fastening band 26, the stator frame 1 of the protrusions 2 has an elongated shape. The inner periphery of the bottom s5 of the stator frame between the protrusions 2 is pressed against the outer periphery of the stator core 4 only by plastic deformation into the shape, but a gap 32 is generated.
Convex polygon 3 consisting of protrusions 2 and 2b, 2a according to the present invention
Since the top ends of the plurality of 5 (octagonal) protrusions 2a are tightened with a pressing force P that increases evenly, the other protrusions 2, 2b, 2a arranged between each protrusion 2a Since the gap 32 between the inner periphery of the bottom 5 of the stator frame 1a and the stator core 4 is reduced and the welding condition is stabilized, there is an effect that the welding portion 89 can be firmly welded. Therefore, heat transfer from the outer circumferential surface of the stator core 4 to the bottom 5 of the stator frame 1a is limited to the welded portion 8.
9, the heat is effectively dissipated. Also,
A plurality of protrusions 2a, 2b that are higher than the height H of the conventional protrusions 2.
A stator frame 1 whose tip is arranged in a convex polygon 35 (octagon)
Since the ridges 2a and 2b are formed, the surface area of the conventional ridges is increased, and therefore the cooling effect on the ridges 2a and 2b is increased.

In the embodiment of the present invention described above, the tangents connecting the top ends of the protrusions 2a provided equidistantly on the stator frame A are convex polygons 85 (
octagon), and the central angle α of the protrusions 2 between the protrusions 2a and 2a is
is 45°, but the present invention is not limited to the above-mentioned convex polygon 35 (octagon), and may also be used when the central angle α of the protruding rim 2 between the protruding rims 2a is 80° ( Convex polygon is 1
[Other Examples] Next, Fig. 9, Fig. 10, and Fig. 11 are shown for other embodiments. Refer to and explain. FIG. 9 is an upper half sectional view of a completely enclosed external fan-shaped rotating electrical machine showing another embodiment, and FIG. 10 is an X--
FIG. 11 is a cross-sectional view along the X-ray in the direction of arrows, and is an expanded cross-sectional view of the main part of the protrusion shown in FIG. 10. However, the same parts as those in the present invention described above will be designated by the same reference numerals, and detailed explanation will be omitted.

In another embodiment, as shown in FIG. 10, the protrusions 8a, 8b, and 8 are used as the protrusions, and the protrusions 8a and 8a are arranged on a line with the center angle α of 45°. , the tangent line connecting the vertices of the protrusion 8a is a convex polygon 8 similar to the present invention described above.
5 (octagonal) stator frame 1b is formed. The steel plate 84b of the stator frame 1b of another embodiment includes a plurality of protrusions 2 and 2b having different heights H, H2, and Hl on the steel plate 84 shown in FIG. 6 of the present invention.

2a, the height of the crushing ridge 8 is H], the height H2 of the crushing ridge 8b, and the height Hl of the crushing ridge 8a.
The disposed plastically worked steel plate 84b is rolled into a cylindrical shape, and the central angle α of the protrusion 8 shown in FIG.
The protrusions 8a and 8a are arranged on the radiation line of °, and the protrusions 8, 8b, and 8a are arranged along the tangent line connecting the vertices of the protrusion 8a, and the cylindrical shape of the convex polygon 85 (octagon) is formed. A stator frame 1b is formed, and the stator core 4 is inserted and provided within the stator frame 1b.

Therefore, in the same way as when the stator frame 1b is tightened with a tangential fastening band connecting the top ends of the protrusions 2.2b and 2a group of the stator frame 1b shown in FIG. 7 of the present invention, By tightening with the tension of the fastening band 26, the inner periphery of the bottom of the stator frame 1b can be pressed against the outer periphery of the stator core 4, similar to the present invention described above, and the stator core 4 and the welded part 6 can be pressed. Can be firmly welded. Also, the crushing protrusions a, ab, $a of the stator frame 1b
The effect of increasing the heat dissipation effect by heat transfer from the stator core 4 to the group can achieve the same effect as the present invention described in m. However, the difference in configuration between the stator frame 1a of the present invention described above and the stator frame 1b of other embodiments is that the protrusions 2, 2b, and 2m of the stator frame 1a of the present invention are formed by folding the steel plate 84 into a corrugated shape. However, in other embodiments, as shown in FIGS. 9 and 10, the stator frame 1b is bent.
Since the crushed ridges 73, 8b, and 8a are formed, the inside air ventilation path 11 is not formed, and the outside air cooling air 12m is generated in one direction of the arrow 24 by the action of the outside fan 21, and the crushed ridges 8, 8
This is to cool the groups b and aa by removing the heat generated by heat transfer from the stator core 4.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of the upper half of a conventional fully open external fan-shaped rotating electric machine, Fig. 2 is a cross-sectional view taken in the direction of arrow It-1 in Fig. 1, and Fig.
The figure is a sectional view of main parts showing the manufacturing process of a conventional stator frame.
The figure is an explanatory diagram of the binding force of the conventional protrusion, Fig. 5 is a sectional view of the main part of the stator frame showing an embodiment of the present invention, and Fig. 6 is an enlarged view of the main part of the protrusion in Fig. 5. Fig. 7 is an explanatory diagram of tightening the stator frame with a fastening band, Fig. 8 is a characteristic diagram of the relationship between the pressing force on the protrusions and the tension with respect to the central angle between the protrusions, and Fig. 9 is An upper half cross-sectional view of a completely enclosed external fan-shaped rotating electric machine showing another embodiment, FIG. 10 is a cross-sectional view in the direction of arrows along the line X-X of FIG.
FIG. 11 is an expanded cross-sectional view of the main part of the protrusion shown in FIG. 10. 2, 2a, 2b... Projection 1a... Stator frame 4
... Stator core 85 ... Convex polygon α ... Center angle α1 formed between the protrusions 2a ... Apex angle T ... Tension of fastening band P
...Pushing force agent Patent attorney Rule Kensuke Chika (and 1 other person) Figure 1 π Figure 7 htLrOM Figure 8 6 -> CI (IX during the disaster period: Meat) City J Dol Figure 10 Figure 11 4b

Claims (1)

[Claims] A steel plate with good thermal conductivity is bent and plastic processed into multiple protrusions.
In a rotating electric machine where the protrusions are rounded into a cylindrical shape and formed in the axial direction so that the protrusions are radial, and the stator core is inserted into the stator frame, the top ends of the highest protrusions are connected with a straight line. Amnesty for forming a protrusion so that the apex angle of the resulting convex polygon is 90° or more and 150° or less, and the angle formed by the center line of the protrusion is 80° or more and 90° or less. rotation iui.