JPS59222049A - Air vent duct of rotary electric machine core - Google Patents

Abstract

PURPOSE:To equalize the surface pressure of laminated layers of a core by passing a projection of a duct piece through a plate for supporting the piece, superposing the plate to block the projection, and integrally securing by spot welding the end of the projection to the plate. CONSTITUTION:A small hole is formed corresponding to a projection 4 of a duct piece 2 at a plate 3a which supports the piece 2. the projection 4 is passed through the hole, a plate 3b is further superposed to block the projection 4, and the projection 4 and the plate 3b are integrally spot welded. The end 4b of the projection and the plate 3b are secured by this welding, thereby providing an effect equal to caulking of the projection. Since the plate 3b does not have a projection, the core can obtain normal surface pressure of the laminated layers even if many air duct are axially mounted.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a ventilation duct structure of a rotating electric machine iron core, particularly
The convex part of the duct piece and the plate supporting it are solidified by spot welding, and the structure is then fixed for one night.

[R scene of invention]

In a conventional ventilation duct, the duct piece and the plate supporting the rL are fixed together by spot welding and tightening of the protrusions.

Spot welding can be completed in a short time using spot welding equipment, increasing productivity. However, spot welding alone lacks reliability due to welding in an unstable state perpendicular to the plate and the difficulty of non-destructive testing. Therefore, the duct piece is supported by the grate by using the convex portion and the Gray If caulking method in combination.

Also, although a caulking effect can be obtained by spot welding the convex portion of the duct and the plate, it is not practical because the electrode of the spot welding device must be pressure welded from an oblique direction.

It is necessary to caulk the convex end of the C1 duct piece. Examples of caulking are shown in FIGS. 1 and 2. The duct piece 2 passes through a plate 3 having small holes at positions corresponding to the convex portions 4 and is mechanically fixed by caulking 4a. However, in this method, the caulking 4a protrudes from the plate 3, so if a large number of ventilation ducts are installed in the axial direction as shown in Figures 3 and 4 and the iron core is tightened, the Z and caulking 4a may protrude. Area pressure is received in some areas, and slack occurs in other areas. If the rotating electric machine is operated in this state, vibrations will increase in both the iron core 1 and the ventilation duct, and there is a high possibility that a serious accident will occur, such as damage to the teeth or duct pieces.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a ventilation duct in which the protrusion of a convex portion of a duct piece of the ventilation duct does not affect the core stack thickness.

[Summary of the invention]

The gist of the present invention is a radial ventilation turret structure, in which a duct piece having a convex portion, a plate adjacent to and supporting the duct piece penetrates the convex portion, and further, the entire plate covers the convex portion, The convex end and plate are fixed together by spot welding.

[Embodiments of the invention]

An embodiment of the invention is shown in FIGS. 5 and 6.

Duct piece 2rj with a convex portion 4: A small hole is formed in the plate 3a that supports it in correspondence with the convex portion 4, and a small hole is formed in the plate 3a that supports the convex portion 4.
, and further overlap the plate 3b to close the convex part 4,
The convex portion 4 and the plate 3b are spot welded together. By this welding, the convex end 4b and the plate 3b are fixed, and the convex part 3b has a concentric effect when caulked.Also, since the plate 3b has a small protrusion, a large number of ventilation ducts are installed in the axial direction. However, the iron core can obtain normal laminated surface pressure.

Additionally, all of the duct pieces can be fixed to the grate by spot welding, improving productivity.

〔Effect of the invention〕

According to the present invention, the ventilation duct maintains its mechanical strength and is not deformed due to protrusion, so that the laminated surface pressure of the iron core becomes uniform.

In addition, all the duct pieces can be fixed by spot welding, which has the effect of improving productivity.

[Brief explanation of drawings]

Figure 1 shows a part of the conventional duct piece installed in F view;
The figure is an enlarged view of the caulked and fixed figure of figure 1, figure 3 is a vertical cross-sectional view of the iron core, figure 4 is a partial front view of the ventilation duct with the duct piece attached to it (t), and figure 5 is the duct piece of the present invention attached. FIG. 6 is an enlarged view of the convex part of the duct shown in FIG. 5 and the plate fixed by spot welding. ■... Iron core, 2... Tact piece, 3... Support grate, 4 No. 10 Figure 2 Figure 3 Figure 4 Figure 5 a Not 61 yen I

Claims (1)

[Claims] l, a duct piece with a convex portion, and two plates supporting this duct piece 11. In a rotating iron core having a radial ventilation tuff track, the convex portion of the duct piece penetrates the one plate, and the convex portion is fixed to the other plate by spot welding. Ventilation duct for the iron core of rotating electric machines.