JPH0442893B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a rotor for a rotating electric machine.

[Conventional technology]

Generally, the end portion of the rotor winding of the rotor of a turbine generator is as shown in FIG. A body insulation 3 is provided between the wire 1 and the retaining ring 2 to insulate the two. Normal trunk insulation 3 is shown in Fig. 4 and Special Publication No. 56-
As described in Publication No. 35108, the center ring 4 is divided into two in the circumferential direction, with one axial end provided at the end of the rotor body and the other provided at the axial end of the retaining ring 2. The inner surface of the trunk insulation 3 which is assembled so as to face the side surface and which faces the rotor winding 1 is treated with a slippery material such as tetrafluoroethylene resin. Therefore, it is difficult to improve rotor vibration caused by unbalanced thermal expansion in the circumferential direction of the rotor winding 1 due to frequent startup and stop operations of rotating electric machines, especially high-speed turbine generators. However, no consideration was given to the axial bending of the rotor due to thermal expansion of the rotor winding 1 in the axial direction.

[Problem that the invention seeks to solve]

The above-mentioned conventional technology does not take into consideration the thermal expansion of the rotor winding in the axial direction due to the operation of the electric machine.
Therefore, when the rotor winding is thermally expanded, the centrifugal force of the rotor winding due to rotation causes the trunk insulation to be pulled by the rotor winding, and a force is exerted that tends to move it toward the center ring. In this case, if the end face of the trunk insulation facing the central ring has unevenness, the above-mentioned movement force causes the trunk insulation to push against an unspecified portion of the central ring. This causes the rotor to move its axis, causing abnormal vibrations. This can be achieved by finishing the end face of the body insulation facing the central ring uniformly, but even if the end face of the circular arc-shaped body insulation is finished uniformly on a single item, the rotor cannot be removed when the body insulation is combined. Depending on how the windings are assembled, the planes with the center ring may not necessarily match, so it is necessary to assemble the trunk insulation after assembling the rotor windings, and check whether the center ring is even after installing the center ring. be. Processing after this combination is difficult, such as preventing foreign matter from entering the product and fixing the workpiece, and requires a great deal of time.

Also, even if the body insulation moves under the thermal elongation force of the rotor winding, it is sufficient to ensure a sufficient distance between the body insulation and the center ring so that it does not hit the center ring.
To determine this spacing, consider thermal expansion of the rotor windings, variations in the axial length of the trunk insulation, variations in the assembly of the rotor windings and center ring, ensuring electrical spacing, etc. It is necessary to extend the retaining ring in the axial direction, which requires sufficient mechanical strength, and there are many problems such as strength considerations.

The present invention has been made in view of the above points,
The object of the present invention is to provide a rotor for a rotating electrical machine that can prevent shaft bending.

[Means for solving problems]

The above object is achieved by filling a thermosetting resin filler between the trunk insulation and the central ring.

[Effect]

Since a thermosetting resin filler is filled between the shell insulation and the center ring, even if the finish of the end face of the shell insulation is uneven, the filler ensures that the shell insulation and the center ring are in contact with each other. becomes uniform. As a result, the body insulation subjected to the thermal elongation force of the rotor winding presses the center ring evenly through the filler, and the rotor does not axially bend.

〔Example〕

The present invention will be explained below based on the illustrated embodiments. An embodiment of the invention is shown in FIGS. 1 and 2. FIG. Note that parts that are the same as those in the conventional system are given the same reference numerals, and therefore their explanations will be omitted. As shown in the figure, the rotor winding 1 is attached to the rotor body 5. In this embodiment of the rotor constructed as described above, a thermosetting resin filler 6 was filled between the trunk insulation 3 and the center ring 4. By doing this, the filler 6 is filled along the unevenness between the body insulation 3 and the center ring 4, and the body insulation 3 is filled with the filler 6 after receiving the thermal elongation force of the rotor winding 1. Through this, the center ring 4 is evenly pushed, and a rotor for a rotating electrical machine that can prevent shaft bending can be obtained.

That is, a thermosetting resin filler 6 is placed in the gap created between the center ring 4 side end surface of the trunk insulation 3 and the center ring 4.
is filled so that there is no gap between the trunk insulation 3 and the filler 6, and between the filler 6 and the center ring 4. By doing this, the body insulation 3, which is subjected to the axial thermal elongation force of the rotor winding 1 due to the operation of the electric machine, pushes the center ring 4 through the filler 6, and the center ring 4 The rotor is pushed with a uniform force and the rotor's axis is prevented from bending. Since shaft bending is thus prevented, it is possible to obtain a rotor of a highly reliable rotating electrical machine that does not generate abnormal vibrations.

〔Effect of the invention〕

As described above, the present invention prevents the shaft of the rotor from bending, thereby providing a rotor for a rotating electrical machine that can prevent the shaft from bending.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional side view of the rotor winding end portion of an embodiment of the rotor of a rotating electric machine of the present invention, Fig. 2 is an enlarged longitudinal sectional side view of the central ring side of Fig. 1, and Fig. 3 is a conventional FIG. 4 is an enlarged longitudinal sectional side view of the center ring side of the rotor of the rotating electrical machine, and FIG. 4 is a perspective view of the trunk insulation of the rotor of the rotating electrical machine. 1... Rotor winding, 2... Retaining ring, 3... Trunk insulation,
4... Central ring, 5... Rotor body, 6... Filler.

Claims (1)

[Claims] 1. A rotor winding that is attached to a rotor body and whose end protrudes from the body, a retaining ring that holds the end of the rotor winding, and a rotor winding that is attached to the axial end of the retaining ring. In a rotor of a rotating electric machine, the rotor includes a central ring provided therein, and a body insulation provided between the retaining ring and the rotor winding, wherein a thermosetting resin is provided between the body insulation and the central ring. A rotor for a rotating electrical machine characterized by being filled with a resin filler.