JPS58140101A - Insulated connecting conductor for winding of electric machine - Google Patents

Abstract

PURPOSE:To make it possible to impregnate resin from the inner circumferential side of insulation layer by providing the surface of a connecting conductor with longitudinal grooves that communicate with gaps at the corners of coil strands. CONSTITUTION:A connecting conductor 4 is provided with a plurality of longitudinal grooves 5 that have triangular cross-section to make those grooves connect gaps 3 in corners of coil strands. After this connecting conductor is wound with an insulating tape, the tape is impregnated under pressure in vacuum with a thermo-setting resin, and the resin is hardened by heating. Since in this way an insulating layer 2 is formed by communicating the connecting conductor grooves 5 and the gaps 3 between the corners of strands, and thermo- setting resin is made to be able to impregnate under pressure in vacuum, for both the insulating coil and insulating connecting conductor the insulating layer 2 is impregnated from both outer and inner circumferential faces, and the coil as a whole is able to have dense insulating constituent that is free of voids.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an insulated connection conductor which is impregnated with a thermosetting resin under vacuum pressure and cured by heating to improve the characteristics of an electric machine winding.

[Technical background of the invention and its problems]

Insulation methods for the windings of large rotating electric machines such as turbine generators include:
As is conventionally known, there are a prepreg method and an impregnation method. The Toguni impregnation method has the advantage that there are fewer voids in the insulation layer because the insulating tape is wrapped around the winding wire, then the thermosetting resin is impregnated under vacuum pressure and then heated and cured to complete the insulation layer. . However, in this method, the thermosetting resin is infiltrated from the surface of the insulating layer, mainly between the layers of the insulating tape. Certain impregnation limits exist. If the number of windings of the insulating tape exceeds this impregnation limit, the impregnating resin will not be sufficiently impregnated, leaving voids in the insulating layer, which will not only deteriorate the electrical properties such as Tanδ-voltage characteristics, but also This may also shorten the life of the winding.

However, in a general electrical winding coil, the conductor cross section is not a perfect rectangle, but as shown in Figure 1, the corners of each strand (1) are rounded, so-called corners. A gap (3) exists between the conductor and the innermost peripheral surface of the insulating layer (2). Therefore, the impregnating resin often penetrates into the insulating layer (2) from the inner side of the insulating layer (2) through the void (3) in addition to the path from the insulating surface described above, and the impregnation limit is often expanded.

Considering the insulated connection conductors such as the lead conductor and the correlation connection shown in Figure 2 based on the above knowledge, conventionally the conductor surface of the connection conductor (4) was a one-piece rectangular shape, as shown in the cross-sectional view in Figure 3. There is no gap (3) (see FIG. 1) through which the impregnated resin can pass between the connecting conductor (4) and the innermost peripheral surface of the insulating layer (2). Therefore, the impregnation limit is narrowed, and the conditions for resin impregnation of the coil become worse.

[Purpose of the invention]

An object of the present invention is to provide an insulated connection conductor that can improve the resin-impregnated characteristics of a coil for electric machine windings, and hence improve the mechanical and mechanical properties of the coil.

[Summary of the invention]

In the present invention, by providing a gap between the corners of the coil strands (a longitudinal groove extending through three stages) on the surface of the connecting conductor (4), the inner circumferential surface of the insulating layer (2) ) can also be impregnated with mpU.

[Embodiments of the invention]

Example 1 A first example of the present invention will be described below with reference to FIG. 4. Note that the cross section of the coil connecting this insulated connection conductor is as shown in FIG. 1, and the perspective view of this insulated connection conductor is as shown in FIG. 2, so please refer to this as well.

A plurality of longitudinal grooves with a triangular cross section (
5), which communicates with the gap (3) between the corners of the strands in FIG. After winding an insulating tape around this connecting conductor (4), it is impregnated with a thermosetting resin under vacuum pressure and cured by heating.

Next, the effect will be explained.

The insulating layer (2) is formed by connecting the groove (5) of the connecting conductor with the gap (3) between the corners of the strands, and the thermosetting resin can be impregnated with vacuum pressure, so the insulated coil, The insulating layer (2) of both the insulated connection conductor and the insulating layer (2) is impregnated with resin from both the outer periphery and the inner periphery, and a dense insulation structure without voids can be obtained as a whole.

Embodiment 2 In FIG. 5, the cross-sectional shape of the groove (5) is rectangular, and the other features are the same as in Embodiment 1, and the functions and effects are also the same as in Embodiment 1.

Example 3 The cross-sectional shape of the sixth figure 1ll (51) is semi-circular, and the other aspects are the same as in Example 1, and the operation and effect are also the same as in Example 1.

It should be noted that the present invention is not limited to the embodiments described above and shown in the drawings, and it goes without saying that it can be implemented with various modifications without departing from the gist thereof.

〔Effect of the invention〕

As described above, according to the present invention, both the coil and the connecting conductor can be impregnated with resin from both the inside and outside of the insulating layer. An insulated connection conductor is obtained.

[Brief explanation of drawings]

FIG. 1 is an Ill side view of an electric winding coil that connects insulated connection conductors according to a conventional method and an embodiment of the present invention, and FIG. A perspective view of , an enlarged cross-sectional view showing the disconnection & continuous conductor in the conventional case in the direction of the arrow A in s dig 2,
No. 4N is an enlarged sectional view showing an insulated connection conductor in one embodiment of the present invention as viewed from the arrow along the arrow ▲1A of the second factor, and FIGS. 5 and 6 show other different embodiments. It is a sectional view of the main part. 1...Conductor element I1 2...Insulating layer 3...Gap 4...Connecting conductor 5... Kazuo Inoue, agent Patent attorney Figure 1 Figure 3 Figure 4

Claims (4)

[Claims] (1) A single connecting conductor is connected to a coil on which an insulating layer is applied by bundling multiple IkO wires with corners, wrapping them with insulating tape, impregnating them with thermosetting resin under vacuum pressure, and curing them with heat, An electric machine characterized in that an insulated connection conductor of an electric machine winding provided with an insulating layer of the same type as the coil is provided with a longitudinal groove on the surface of the connection conductor that communicates with the gap between the corners of the coil strands. Insulated connecting conductor of winding. (2) The insulated connection conductor for an electric machine winding as set forth in claim 1, wherein the grooves are plural and each cross section is triangular. (3) The patent claim is characterized in that the grooves are plural and have a short bath shape. An insulated connection conductor for an electric machine winding according to item 1. (4) The insulated connection conductor for an electric machine winding as set forth in claim 1, wherein the groove is plural and the cross section is semi-circular.