JPS5829340A - Coil for rotary machine - Google Patents

Abstract

PURPOSE:To obtain a ground insulating layer, which is excellent in all of life in case of electrification, the impregnating property of resin and initial characteristics, by forming an insulating layer by non-baked mica or glass outside an insulating layer by baked mica and shaping the ground insulating layer. CONSTITUTION:A hard baked mica tape 3A, a hard non-baked mica tape 3B and a hard baked mica tape 3C are stacked and wound around strands 1, to which inter layer insulation 2 is executed, in order of these tapes, and the ground insulating layer 3 is formed. A glass tape 4 is further wound on the outer circumference, and resin is impregnated through an integral impregnation method. Accordingly, the advantages of both the baked mica and the non-baked mica are obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an insulating structure for a wire in an integrally impregnated rotating machine.

When using fully assembled mica f% as the ground ll1A edge of a high-pressure rotating tm silver ring, there are two hard types: fired mica, chikara, and unfired mica, each of which has advantages and disadvantages. FIG. 1 is a graph showing the impregnating property of the resin in integral impregnation as a relationship between the resin injection time and the capacitance of the insulating layer. FIG. 2 is a graph showing the relationship between the initial characteristic, ie, -δ, and the voltage. FIG. 3 is a graph showing the energization life in terms of the relationship between elapsed time and breakdown electric field.

In each figure, the broken line shows the characteristics when insulation is applied only with fired mica chives, and the dashed-dotted line shows the characteristics when insulation is applied only with unfired mica chives.

(2) As can be seen from Figures 1 to 3, when only the fired mica tape is insulated with K, the life of electricity is good, but the resin impregnability and initial characteristics are poor. On the contrary, no firing! If insulation is applied only by squid chips, resin impregnation and initial characteristics are good, but there is a problem that the life of the electric current is poor and the insulation is long.

■ On the other hand! What is the workability of squid tape winding, the thickness of the insulation layer, and what is the quality of the insulation layer? ! When considering the degree of wrinkle formation that causes gaps, unfired mica chives are good in all respects, but fired mica chives tend to wrinkle more easily.

As described above, there are advantages and disadvantages to ground insulation using conventional fully assembled mikachi f. Therefore, it is an object of the present invention to provide a ground insulating tube that is excellent in all of the electrification life, resin impregnability, and initial characteristics. Therefore, in the present invention, the inner P! An insulating layer made of unfired mica or glass is overlaid on the binding layer to provide ground insulation.

FIG. 4 shows a cross-sectional structure of a high-pressure rotating machine raceway as an embodiment of the present invention. 4th v! In J, 1 is elemental 1it (electric y
s> Then, the interlayer insulation 2 is applied to the strand 1 to form a silver ring, and then the ground insulation layer 3 is formed on top of the interlayer insulation 2, which is a hard fired type! Squid tape 3A, hard non-fired type! Squid tape 3B and hard fired type! The squid tape is wound in the order of 3C'lt, and the outermost periphery of the high-pressure rotary machine is wound with 4t of windings.It is placed in the groove of the iron core of the high-pressure rotating machine coil, which is constructed in this way, and resin is applied by the usual integrated impregnation method. Impregnate. The characteristics of the high-pressure rotary machine wire wheel of this example are as shown by the solid lines in Figures 1 to 3.
As you can see from Figure 2, it is as good as the hard non-fired type, and as shown in Figure 3, the energized life is as good as the hard fired type). They complement each other and their strengths are thriving. In addition, by using unfired Mica Tag 3B, the insulation layer has good firmness and less wrinkles.

On the other hand, considering the potential distribution in the through-layer direction in the ground wire insulating layer, the potential at the silicon melting edge is higher than elsewhere due to the influence of the corners of the wire 1. In other words, the electric field near the strands is higher than the average electric field applied to the ground insulating layer, so the inner insulating layer needs to be wound with hard fired mica chives that have a good life when applied with electricity, as shown in Figure 4, 3A. The next layer does not necessarily have to be hard unfired mica chive 3B, but can be anything that has good resin retentivity and tape winding properties.Glass tape is most suitable for hard unfired mica chive 3BM. In this case as well, almost the same good characteristics as the solid lines in Figures 1 to 3 were obtained.

As explained above, the rotating machine wire of the present invention has excellent resin impregnability, initial characteristics, and electrification life, and is suitable for application to the integral impregnation method.

Note that the present invention is not limited in any way to the thickness or width of the tape, or the proportion of each layer in the insulating layer;
It can be applied to all insulation structures that have multiple stages of ground insulation. Furthermore, the rotating machine itself is not limited to its rated voltage class, etc., and is assembled! The present invention can be applied to any rotating machine that uses squid chips, and the present invention can be applied to any rotating machine that is insulated to the ground and where the stone is located inside the groove or outside the groove of the rotating machine race.

[Brief explanation of the drawing]

1 to 3 are graphs explaining the characteristics, and FIG. 4 is a sectional view showing one embodiment of the present invention. In the drawings, 1 is a bare wire, 2 is insulation between the eyebrows, 3 is three ground insulating layers and 30 is a hard fired mica tape, 3B is a hard unfired mica tape, and 4 is a glass tape. Patent Applicant: Meidensha Co., Ltd. Agent: Patent Attorney: Shibu Ishibu (1 other person)
Figure 1 Notes X Time Figure 2 Figure 3

Claims (1)

[Claims] Used as a ground insulation layer for rotating machine wheels and fired! A rotary machine coil comprising an inner insulating layer made of squid and an insulating layer made of unfired mica or graphite provided on the outer periphery of the insulating layer.