JPS5820536B2 - Stator of rotating electric machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a stator for a rotating electrical machine, and more particularly to a stator for a rotating electrical machine that has a stator cover around the outer periphery of a stator core to prevent noise.

As shown in FIG. 1, in a conventional rotating electric machine, an appropriate number of support arms 2 extending in the axial direction are disposed within a stator frame 1, and a stator core 3 is attached to the support arms 2.

As shown in FIG. 2, the support arms 2 are disposed at regular intervals in the circumferential direction when viewed in the axial direction, and are adapted to fix a substantially cylindrical stator core 3 at its outer periphery. .

Further, a stator core cover 5 is disposed around the outer periphery of the stator core 3 with a constant gap 4 from the stator core 3, and this stator core cover 5 is fixed to the support arm 2.

That is, the stator core cover 5 has a plurality of members each having an arcuate cross section, each of which has both edges fixed to the support arm 2, and has a cylindrical shape as a whole, and covers the stator core 3.

In FIG. 1, reference numeral 6 indicates a vent, 7 indicates a ventilation fan, 8 indicates a rotor, and 9 indicates a flow of cooling air.

Here, as shown in FIG. 2, conventionally, the stator core cover 5 is fixed to the support arm 2 at an intermittent welding portion 10, that is, intermittently welded to each other, and during the operation of the rotating electric machine. In order to suppress electromagnetic noise generated by
A certain gap 4 was formed between the stator core cover 5 and the outer periphery of the stator core 3 to provide an air layer.

The thickness of the stator core cover 5 is 1.6rIL7IL~
32I! W, and this thin steel plate allows at least 5
It was supposed to be able to block 30 dB of noise at 0.00 Hz.

However, as mentioned above, the stator core cover 5 is
Since the stator core cover 5 is fixed by the intermittent welding part 10, the stator core cover 5 is subjected to minute vibrations due to vibration propagation from the stator side.
That is, there is a drawback that the stator core cover 5 cannot sufficiently exhibit its sound blocking effect due to the occurrence of chatter.

That is, when the stator core cover 5 trembles, vibrations due to the tremor are propagated to the outside, and the electromagnetic noise leaks to the outside from between the stator core cover 5 and the support arm 2.

Therefore, in order to reduce the vibration propagation from the stator side, it is possible to closely fix the stator core cover 5 to the support arm 2 by continuous welding, but in this case, since the stator core cover 5 is a thin plate, The deformation increases, making it impossible to provide the soundproof air layer and keeping the gap 4, which also serves as a ventilation path, constant, resulting in the inconvenience that the stator core cover 5 comes into contact with the stator core 3. there were.

The present invention has been made in order to eliminate such drawbacks of the prior art, and its purpose is to prevent the stator core cover from becoming loose and to fully exhibit its sound insulation effect, thereby suppressing electromagnetic noise. Our goal is to provide stators for rotating electrical machines that can.

In the present invention, a stator core cover whose both ends are temporarily attached to a support arm is fixed to the support arm over the entire length in the axial direction using an adhesive elastic body, thereby eliminating the wobbling of the stator core cover. It is.

The present invention will be described below based on embodiments shown in the drawings.

Here, parts that are the same as or corresponding to the conventional ones are given the same reference numerals, and explanations of these parts will be omitted.

FIG. 3 is a sectional view at the same position as FIG.
As shown in the figure, the stator core cover 5 is fixed to an appropriate number of support arms 2 by flexible bodies 12.

This flexible body 12 is provided at least along the axis between the stator core 5 and the support arm 2 in order to securely fix the stator core 5, which has both axial ends positioned and fixed to the support arm 2 by temporary welding, to the support arm 2. It is injected over the entire length in the direction to close the space between the stator core cover 5 and the support arm 2.

The flexible body 12 is made of a material that has adhesive properties and has appropriate rubber-like elasticity.

Particularly suitable for this flexible body 12 is what is called a sealant (trade name).

Vibrations generated in the rotating electricity by fixing the stator core cover 5 in this manner are propagated from the fixed frame 1 to the support arm 2, but are not propagated to the stator core cover 5.

That is, the vibration is absorbed by the flexible body 12 that is interposed between the stator core 5 and the support arm 2 and fixes them. This prevents the child core cover 5 from shaking.

Next, FIG. 4 shows the relationship between the frequency of noise actually generated and the noise leaking to the outside, comparing the conventional case and the case of the above-mentioned embodiment. In this embodiment, the curve indicated by the dotted line B indicates the case where the stator core cover 5 is conventionally attached to the support arm 2 by intermittent welding, and the curve indicated by the solid line C is conventional, especially the continuous A case is shown in which the stator core cover 5 is fixed by welding.

As can be seen from this figure, according to this embodiment, there is a difference in sound insulation effect of 5 dB compared to the conventional method in which the stator core cover 5 is fixed by continuous welding.

Further, according to this embodiment, since the flexible body 12 has appropriate elasticity, it can withstand long-term use, and therefore the need for maintenance and inspection can be reduced.

Furthermore, since the flexible body 12 has adhesive properties and is easy to attach, assembly is extremely easy.

That is, the stator core cover 5 is positioned and fixed to the support arm 2 by temporary welding at both ends, and the flexible body 12 is fixed with a spatula or the like.
It should be injected between the stator core cover 5 and the support arm 2.

Therefore, this embodiment has the advantage that the number of processing steps can be reduced and manufacturing can be performed at a very low cost.

As described above, the present invention has the excellent effect of significantly increasing the electromagnetic noise insulation effect by preventing the stator core cover from shaking.

[Brief explanation of the drawing]

Fig. 1 is a cutaway front view showing a conventional rotating electric machine, Fig. 2 is a cross-sectional view taken along the ...-■ line in Fig. 1, and Fig. 3 is a cross-sectional view showing the main parts of the stator of the rotating electric machine according to the present invention. 4 are explanatory diagrams showing the relationship between frequency and noise by comparing the embodiment of the present invention and the conventional method. 1... Stator frame, 2... Support arm,
3... Stator core, 5... Stator core cover, 12... Flexible body.

Claims (1)

[Claims] 1. A stator core is attached to an appropriate number of support arms extending in the axial direction within the stator frame, and a stator core cover is attached to the support arms so as to cover the outer periphery of the stator core with a certain gap. In the stator of the installed rotating electric machine,
A stator for a rotating electric machine, characterized in that the stator core cover, whose axially opposite ends are positioned and temporarily attached to the support arm, is fixed to the support arm over its entire axial length with an adhesive elastic body.