JPH04150751A - Stator winding end supporter - Google Patents

Abstract

PURPOSE:To firmly support the ends of stator windings by arranging spacers between the windings and a supporting member, filling thermoplastic material in the gaps between the windings and the supporting member and between the windings, and hardening the material to form spacers. CONSTITUTION:Glass epoxy resin laminate spacers 8 are arranged between an upper coil 1a and an intermediate spacer 4 and between a lower coil 1b and an insulating ring 2 to support the coils lengthwise by both axial ends of the insulating ring 2 and three points between the ends as shown by the figure. The gaps between the coils 1a and 1b and the intermediate spacer 4 and the gap between the coils are filled with compounds 5 hardened by heating after a presser plate 3 is arranged. The spacers between the supporting member and the windings suppress deformation of the windings and prevent a gap from being made between the supporting member and the windings, therefore, a reliable stator winding end supporter is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a support device for a stator winding end of a rotating electric machine, such as a turbine generator.

[Conventional technology]

4 to 6 show a support device for the end of a stator winding of a conventional rotating electric machine, a turbine generator having a water cooling coil, as shown in, for example, Japanese Patent Application No. 1-289006.
FIG. 4 is a schematic configuration diagram, and FIGS. 5 and 6 are cross-sectional views taken along section 1--2 and section Vl-Vl in FIG. 4, respectively. In these figures, (1) is an end portion of the stator winding covered with an insulator, and is composed of an upper end coil (1a) and a lower end coil (1b), which are windings. (21 is an insulating ring that is a supporting member disposed on the outer circumferential side of the stator winding end (1), and (3) is a fixing ring disposed on the inner circumferential side of the stator winding end (1). The holding plate made of insulator (2) is a member that connects the upper coil (1a) and lower coil (1b) of the stator winding end (1).
) is an intermediate spacer made of an insulating material that is a support member like the insulating ring ■.
lb), a compound that is a gap member filled between the insulating rings (2) and heat-cured (details will be described later),
(61 is the stator core, and (to) is a support that supports the insulating ring (2) from the stator core (6) side. Although not shown, it is connected by screws on both sides through the holding plate (2). The upper coil (la), the intermediate spacer (2), the lower coil (
1b) and the compound (2) are tightened and integrated with the insulating ring (2), and the entire integrally fixed stator winding end (1) is supported by a support port from the stator core (6) side.

By the way, the compound (51) is made of thermosetting synthetic resin, and before hardening has the same plasticity as clay.

Next, the assembly work of the stator winding ends using compound (5) will be explained. First, insulation ring (2)
is installed in the generator, and after spreading the compound to the specified thickness on the inner surface of the insulating ring (2), install the lower coil (1).
b). After that, after filling the space between the upper coils (1b) with compound ■, the inner circumferential side of the lower coil (1b) (the intermediate spacer of the lower coil (1b) in Fig. 6)
Place the compound (5) to a predetermined thickness on the (a) side),
Install an intermediate spacer (A) around the inner circumference. The same goes for the inner periphery of the intermediate spacer (A).
After spreading the compound to a specified thickness on the inner circumference of (b), install the upper coil (1a), and then spread the compound between the upper coils (1a) and on the inner circumferential surface of the upper coil (1a). (After laying 51, install the presser plate (3). In this way, presser plate B), upper coil (1a), intermediate spacer (2), lower coil (lb), insulation ring (2)
The space between the two is filled with a compound (hereinafter referred to as buried). Then the stator winding end (1)
The whole is heated and the compound ((5) is thermally cured while maintaining its shape, forming an upper coil (la) and a lower coil (1).
b) is firmly fixed with a compound (51).

Generally, at the ends of a generator, there is leakage magnetic flux generated from the rotor winding end (not shown) and the stator winding end (1), and this leakage flux occurs from the stator winding end (1). Because of the interlinking, electromagnetic force acts on the stator winding end (1), causing vibration.

Electromagnetic force includes not only steady electromagnetic force that acts during normal operation, but also transient electromagnetic force caused by short circuit accidents that occur within power plants or in power systems. In particular, this transient electromagnetic force can reach 10 to 15 times the steady electromagnetic force.

Therefore, the stator winding end (1) needs to be firmly fixed and supported so as not to be damaged by steady electromagnetic force or transient electromagnetic force. has been considered.

For small-capacity generators, a method has been adopted in which the ends of the stator windings are integrated with tying strings or the like, so that the electromagnetic force is supported only by the rigidity of the coils.

On the other hand, in large-capacity generators, a water-cooled coil with good cooling efficiency is adopted for the stator winding from the viewpoint of generator efficiency, etc., so the cross-sectional area of the coil is smaller than that of small-capacity generators, and the rigidity of the coil is reduced. It is no longer possible to support it by supporting it only by

Therefore, we installed a large insulating ring on the outer circumference of the coil.
A structure that reinforces rigidity is adopted.

The above-mentioned FIGS. 4 to 6 show the support structure of the stator winding end of a turbine generator having such a conventional water cooling coil. An insulating ring (2) is provided on the outer circumference, a presser plate (3) is provided on the inner circumference, and an intermediate spacer (2) is provided between the upper coil (1a) and the lower coil (1b). with compound (5
) are buried and thermally hardened, and these are firmly tightened and supported by double-threaded bolts and nuts (not shown). Further, the entire integrally fixed stator winding end portion is supported by a support (7) from the stator core (6) side. Note that an axially movable mechanism (not shown) is provided between the insulating ring (2) and the support (2) for the purpose of absorbing thermal expansion and contraction of the stator windings that occurs during operation.

[Problem to be solved by the invention]

Since the conventional stator winding end support device is configured as described above, the compound (5) is applied to the stator winding end (
1) has plasticity until it is assembled and thermoset. For example, during assembly, a compound (he) is laid on the inner surface of the insulating ring (■), and the lower end coil (1b) is placed on the compound (he). If the weight of the worker or the load of the assembly work tools is applied to the lower coil (1b) at the stage where the lower coil (1b) is directed outward in the radial direction (
The compound (5) is pushed away by deforming downward (in Fig. 4), and when the load is removed, the lower coil (1b) returns due to its elasticity, creating a space between the lower coil (1b) and the insulating ring ■. In some cases, voids were formed. If the compound (51) is cured while this void exists, the lower coil (1b) will be excessively deformed when electromagnetic force (mainly in the outward radial direction) is applied to the lower coil (1b). There was a risk that the lower coil (lb) would be damaged due to repeated exposure to the upper coil (1a).
The same applies to the gap between the spacer and the intermediate spacer (2).

This invention was made to solve the above-mentioned problems, and its purpose is to provide a highly reliable stator winding end support device that can firmly support the stator winding ends. do.

[Means to solve the problem]

A stator winding end support device according to the present invention includes a spacing member provided between a winding at a stator winding end and a support member provided on the outer circumferential side of the winding and supporting the winding. The gap between the winding and the support member is maintained at a predetermined value, and a hardened plastic gap member is provided between the gap and the winding.

[Effect]

In this invention, when the winding receives an external force while the gap member buried in the gap between the winding and the support member has plasticity, the winding is supported by the support member via the spacing member. There is no risk of the wire deforming and pushing away the gap member.Therefore, even if an external force is applied to the winding, no gap will be created between the winding and the gap member, and the winding will not harden in the state where there is a gap. The wire can be supported reliably.

〔Example〕

1 to 3 show one embodiment of the present invention, FIG. 1 is a schematic configuration diagram, and FIGS. 2 and 3 are cross sections II-II and I-1 in FIG. 1, respectively. FIG. In these figures, (f) is a spacer piece made of glass epoxy laminate that is a spacer member, and as shown in the figure, it is between the lower coil (1b) and the insulating ring ■ and the upper coil (1a).
An insulating ring (21) is provided for each coil along the longitudinal direction of the coil between the spacer 4 and the intermediate spacer 4 to support the coil at both ends in the axial direction and at three locations in between. Since this is the same as the conventional example shown in FIG. 4, corresponding parts are given the same reference numerals and their explanation will be omitted.

The stator winding end support device configured as described above is
It can be assembled as follows. A spacing piece 6 is arranged at a predetermined position on the inner surface of the insulating ring (2), and a lower end coil (1b) is installed after a compound (9) is spread to a predetermined thickness at a place other than the spacing piece. Below is the intermediate spacer (2)
The process up to installation is the same as the conventional example shown in Figure 4.
Next, a spacing piece 6 is placed around the inner circumference of the intermediate spacer (2), a compound (5) is spread, and an upper end coil (laχ) is installed.Furthermore, the compound (5) is stuffed between the upper end coils (1a), and a presser is placed. After installing the plate (3), heat the compound (
5) is cured in the same manner as in the conventional example.

With this configuration, even if an external force in the radial direction is applied to the upper coil (1a) or the lower coil (1b) during the assembly work of the stator winding ends, the lower coil (1b) will be able to maintain the spacing. The upper end coil (1a) is supported by the insulating ring (2) via the piece 8, and the upper end coil (1a) is supported by the insulating ring (2) via the spacer piece 8 and the intermediate spacer (2), so it is deformed in the radial direction and bound ( 5) Don't push away. In addition,
The intermediate spacer (2) is supported by the insulating ring ■ via the compound t51 between it and the insulating ring U, but the compound 4 between the intermediate spacer (A) and the insulating ring (2) is Since the intermediate spacer (a) is supported by the intermediate spacer (a), it will not be pushed away by the intermediate spacer (4) even by an external force during assembly.

Of course, by providing the spacing piece, the distance between the lower coil (1b) and the insulating ring (2) and the distance between the upper coil (1a) and the intermediate spacer (4) can be set to predetermined values. Easy to set up.

In the above embodiment, the stator winding end (1) is supported by the insulating ring (2) by pressing the holding plate (31) with a double-threaded bolt (not shown). 3)
Connect the end of the stator winding (1) with the insulating ring (2) using a string or the like.
) etc., the same effect can be achieved, or a compound (9) may be a hardened plastic material other than synthetic resin.

〔Effect of the invention〕

As described above, according to the present invention, since the spacing member is provided between the support member and the winding, deformation of the winding is suppressed and generation of a gap between the winding and the support member is prevented. Thus, a highly reliable stator winding end support device can be obtained.

[Brief explanation of drawings]

1 to 3 show one embodiment of the present invention, FIG. 1 is a schematic configuration diagram, and FIGS. 2 and 3 are cross-sections at ■-■ and I-1 in FIG. 1, respectively. 4 to 6 show a conventional stator winding end support device, FIG. 4 is a schematic configuration diagram, and FIGS. 5 and 6 are cross sections v in FIG. 4, respectively. -■ and ■-■ are cross-sectional views. In the figure, (1) is the stator winding end, (1a) is the upper coil, (1b) is the lower coil, (2) is the insulation ring,
(f) is a compound, and 6 is a spacing piece. Note that the same reference numerals in the figures indicate the same or corresponding parts. agent

Claims (1)

[Claims] In a support device for a stator winding end of a rotating electrical machine, which supports the winding by a support member provided on the outer circumferential side of the winding at the stator winding end, there is provided a support device between the support member and the winding. A stator winding characterized by comprising a spacing member provided to maintain a gap between the support member and the winding at a predetermined value, and a plastic gap member embedded and hardened between the gap and the winding. end support device