JPH0448116Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to an improvement of a support device that supports long connection wires stacked in several stages, such as crossover wires and lead wires of stator windings of large-diameter synchronous machines. .

Stator winding of rotating electrical machines (hereinafter simply referred to as winding)
After the winding is assembled into the stator core,
In connection wires such as lead wires when pulling out the windings to the outside of the machine and crossover wires connecting between the windings,
For example, in the case of a large-diameter synchronous machine, these connection lines are long.

Conventionally, there have been devices of this type as shown in FIGS. 1 to 3. FIG. 1 is a side view of a synchronous machine schematically showing connection lines of windings, FIG. 2 is a cross-sectional view taken along the cross-section - in FIG. 1, and FIG. 3 is an enlarged sectional view of a support device for the connection lines. In these figures 1
(Fig. 2) shows the stator core, 2 the winding housed in the slot of the stator core 1, 2a the end of the winding, 3
is a connecting wire that connects windings 2 to each other, 4
is a lead wire which is a connection wire for connecting the winding to a terminal box (not shown) for connection to the outside. The crossover wire 3 and the lead wire 4 are shown side by side in FIG. 1, but in reality, they are stacked in multiple stages in the axial direction of the synchronous machine at the end of the stator core 1, as shown in FIGS. 2 and 3. It is being Further, as shown in FIG. 3, the crossover wire 3 and the lead wire 4 are insulated by winding an insulating tape 4b (FIG. 3), which is an insulating layer, around the outer periphery of a rectangular copper wire 4a, which is a conductor. 5
is a slip layer formed by winding an insulating tape with a low coefficient of friction, such as Teflon (registered trademark) tape, around the outer periphery of the crossover wire 4 that comes into contact with an insulating spacing piece 8, which will be described later.

In FIGS. 2 and 3, reference numeral 6 indicates an end plate fixed to a stator frame (not shown) at the end of the iron core 1, and 7
is an appropriate interval in the circumferential direction of iron core 1 (see Figure 1)
A support base 7 which is a support member welded to the end plate 6 at
a is the base plate of the support base 7; Reference numeral 8 denotes a plate-shaped insulating spacing piece that is a holding member provided to sandwich the lead wire 4 in the stacking direction, and 9 (FIG. 3) indicates the lead wire 4 sandwiched between the insulating spacing pieces 8. 10 is a base plate 7 which is pressed from both outside sides through
a, holding plate 9 (Fig. 3), double-threaded bolt provided through insulating spacer 8, 11 nut, 12
is an insulating tube (see FIG. 5) provided on the outside of the bolt 10. A slip layer 5 is provided at the portion that abuts the insulating spacer 8, and the lead wires 4 stacked in multiple stages are attached to the support base 7 via the presser plate 9 with double-threaded bolts 10 and nuts 11, as shown in FIG. It is supported by being pressed by.

Note that the support device 13 for the connection line includes the slip layer 5,
It is composed of a support base 7, an insulating spacing piece 8, a holding plate 9, a double-threaded bolt 10, a nut 11, and an insulating tube 12.

Next, the operation will be explained. Due to the rise in temperature during operation, the crossover wire 3 and the lead wire 4 extend significantly, especially in the length direction. Since the magnitude of this thermal expansion differs depending on the length of the connecting wire, each connecting wire of each stage of the same support device moves differently. For this purpose, a slip layer 5 is provided for each lead line 4, and a slip layer 5 is provided for each lead line 4.
are allowed to move independently.

As described above, in the conventional connection wire support device, it is necessary to provide the slip layer 5 on the surface of the connection wire 4 at the contact portion between the insulating spacing piece 8 and the connection wire (lead wire) 4. In this case, the slip layer is bonded to the connecting wire with adhesive to prevent the slip layer from slipping out, but where the connecting wire is curved, the slip layer surface is likely to wrinkle, lift, or sag, causing friction. There was a drawback that added to the problem. Further, there was a risk that the insulating tape of the connecting wire would be worn out or damaged at the contact portion with the insulating spacing piece 8. Furthermore, when assembling the support device, it is necessary to assemble the connecting wires while sequentially providing slip layers from the bottom, which has the disadvantage of poor workability.

This invention was made in order to eliminate the drawbacks of the conventional devices as described above, and it relates to a connecting wire support device in which the clamping member itself that sandwiches the connecting wire is configured to move in accordance with the thermal expansion and contraction of the connecting wire. It is something.

An embodiment of this invention will be described below with reference to FIGS. 4 and 5. FIG. 4 is an enlarged view of the support device, and FIG. 5 is a sectional view taken along the cross-section - in FIG. 4. In these figures, 21 is a side spacing piece made of an insulating material, and 22 is an insulating spacing piece that is a holding member provided between the side spacing pieces 21 to sandwich the lead wire 4 in the stacking direction as shown in the figure. It is. 23 is a sliding plate which is a thin plate-like sliding member made of an insulating material with a low coefficient of friction such as Teflon or Nomex (all registered trademarks), and is insulated with the side spacing pieces 21 on both sides as shown in the figure. It is inserted between the insulation spacing pieces 22 and between the insulation spacing pieces 22 between the stages of the lead wire 4. The support device 24 includes a support base 7, a presser plate 9, a double-threaded bolt 10, a nut 11, an insulating tube 12, a side spacing piece 21, an insulating spacing piece 22, and a sliding plate 23.

In this embodiment, the hole 22a of the insulating spacing piece 22 through which the double-threaded bolt 10 is inserted is aligned in the expansion and contraction direction (lengthwise direction) of the lead wire 4, as shown in FIG.
It has an elliptical shape with long sides long enough to follow the thermal expansion and contraction of the connecting wire. The same applies to the holes in the sliding plate 23 through which the double-threaded bolts 10 are inserted, although they are not shown.

The rest of the structure is the same as the conventional one shown in FIGS. 1 to 3, so corresponding parts are given the same reference numerals and explanations will be omitted.

In the above configuration, the holding plate 9, double threaded bolt 10, etc. have the same functions as those of the conventional device. The insulation spacing pieces 22 sandwiching the lead wire 4 are movable.
Holding plate 9 and double threaded bolt 10 via sliding plate 23
It is pressed and supported by the support base 7 by a nut 11. The process of stacking the lead wires 4 on the support base 7 from the lower level is the same as the conventional one, but in the middle of the process, the sliding plate 23 is attached to one side of the insulating spacing piece 22, or the sliding plate 23 is attached between the insulating spacing pieces 22. Or pinch it.

The expansion and contraction of the connecting wire (lead wire) 4 due to heat is not caused by the sliding between the connecting wire 4 and the insulating spacing piece 8 as in the conventional case, but by the insulation spacing piece 22 which is divided into two.
each other, or the lateral spacing piece 21 and the insulating spacing piece 22
It is absorbed by the slip between the Therefore, there is no fear of poor friction due to slight irregularities on the surface of the connecting wire or contact with the corners of the insulating spacing piece 22, and a good sliding function is provided, eliminating the risk of damaging the insulation of the connecting wire.

In the above embodiment, a fixing method using double-threaded bolts 10 similar to the conventional support device was shown, but other fixing methods may be used to movably support the insulating spacing piece 22.

As described above, in this invention, by providing the holding member that can move following the expansion and contraction of the connection wire, it is possible to obtain the effect that the connection wire can be reliably supported while effectively protecting its insulation.

[Brief explanation of drawings]

Figures 1 to 3 show a conventional connection line support device. Figure 1 is a side view of a synchronous machine schematically showing the connection line, and Figure 2 is a cross section taken along the cutting line - in Figure 1. 3 is an enlarged view of the support device, FIGS. 4 and 5 show an embodiment of this invention, FIG. 4 is an enlarged view of the support device, and FIG. It is a sectional view taken along the cutting line - in the figure. In the figure, 1 is a stator core, 2 is a stator winding, 3 is a crossover wire that is a connection wire, 4 is a lead wire that is also a connection wire, 4a is a rectangular copper wire that is a conductor, and 4b is an insulating layer. Insulating tape, 6 is an end plate, 7 is a support base that is a supporting member, 9 is a holding plate, 10 is a double-threaded bolt,
11 is a nut, 21 is a side spacing piece, 22 is an insulating spacing piece that is a holding member, 23 is a sliding plate that is a sliding member, and 24 is a support device. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Claims for Utility Model Registration] (1) A support device for a connecting wire of a stator winding in a rotating electric machine, comprising a supporting member, a clamping member, a sliding member, and a pressing means, wherein the connecting wire is It consists of a plurality of connecting wires that connect the stator windings to each other or the stator windings to the outside, and the connecting wires have a conductor and an insulating layer applied to the outer periphery of the conductor. The windings are stacked and arranged near the ends of the windings, the support member is fixed in the vicinity of a position of the stator frame of the rotary electric machine that supports the connection wire, and the clamping member is arranged to support the connection wire in the stator frame of the rotating electric machine. A pair of the connecting wires are held at the position of the supporting member in the direction in which the connecting wires are stacked, respectively, and the pressing means includes a pressing piece disposed at both ends of the holding member in the stacking direction of the connecting wires and the holding member. , a fastener that integrally and irremovably binds the pressing piece, the sliding member, and the supporting member; The pressing means is made of a material with a low friction coefficient that is smaller than the coefficient of friction between the clamping member and the pressing piece, and is provided between the adjacent clamping members and between the clamping member and the pressing piece, and the pressing means A support device for a connection wire of a stator winding, characterized in that the support device is capable of moving more than the amount of expansion and contraction in the length direction of the connection wire due to a temperature change. (2) The clamping member is provided with an oval hole or a circular through hole having a long diameter in the direction of the connection line, and a bolt is used as the tightening tool, and the dimension between the diameter of the bolt and the long diameter of the through hole is provided. 2. The stator winding connection wire support device according to claim 1, wherein the difference is greater than the amount of expansion and contraction of the connection wire.