JPH057934B2 - - 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]

FIG. 2 shows a conventional example of a rotor for a rotating electric machine. As shown in the figure, a rotor 1 has a rotor coil end portion, that is, a rotor coil 3 protruding from a rotor core having a shaft 2, and a retaining ring 4.
and a retaining ring insulation is placed between them, and an end ring 5 and a spacer support plate are placed at the end.
It is insulated with a spacer 6. In the same figure, 7
is Wetsuji.

In the rotor 1 configured in this manner, the retaining ring insulation between the coil 3a at the axially endmost portion and the end ring 5 is likely to be damaged by buckling.
In this connection, there is Japanese Utility Model Application Publication No. 57-1057.

[Problem that the invention seeks to solve]

The above conventional technology has the following problems. That is, as shown in FIGS. 3 to 5, the rotor coil 3 at the end of the generator is wound from the axial direction to the circumferential direction to form north and south poles. The rotor coil 3 thus formed is subjected to centrifugal force and thermally expands due to temperature rise. In particular, this thermal expansion force is greatest at the position of the coil 3a at the end in the axial direction, and as a result of starting and stopping, load increases and decreases, the rotor coil 3 is
Push it into the end ring 5 side.

In order to smoothly escape the coil end in the axial direction, no spacer 6 is provided in this portion. Further, the spacer support plate 9 disposed on the rotor coil 3 side of the end ring 5 has a two-part structure for assembly reasons, and the ring is molded at the time of assembly. In addition, in FIG. 3, 4a is a damper ring. By the way, as shown in FIG. 5, the disassembled spacer support plate 9
a, 9b, the joint between the divided spacer support plates 9a, 9b expands due to the expansion of the retaining ring 4 due to the centrifugal force of the rotor coil, and the retaining ring insulators 8a, 8d as rings are expanded. The binding force becomes weaker. As shown in FIG. 6, when the retaining ring insulations 8a and 8b are pushed in the axial direction by the thermal expansion of the coil 3a at the axial end of the rotor coil 3, so-called thermal expansion, When the ring of the part, that is, the spacer support plate 9 moves and becomes unrestricted, the retaining ring insulation 8a, 8b tends to buckle, causing stress to the root of the coil 3a at the end in the axial direction, which tends to cause damage. .

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 buckling of a retaining ring insulation.

[Means for solving problems]

The above purpose is to provide an insulating support that is in close contact with the retaining ring insulation in the space between the axially endmost coil of the rotor coil and the spacer support plate, and that has a predetermined space between it and the endmost coil. This is achieved by providing and fixing the insulating support and the spacer support plate to the end ring.

[Effect]

The insulating support closely attached to the end of the retaining ring insulation is fixed to the end ring together with the spacer support plate. Thereby, the insulating support and the spacer support plate become restrained from the radial movement of the retaining ring insulation pushed by the thermal expansion of the coil at the axial end, causing the retaining ring insulation to buckle. Never.

〔Example〕

The present invention will be explained below based on the illustrated embodiments. FIG. 1 shows an embodiment of the invention. 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. In this embodiment, an insulating support 10 is provided in the space between the coil 3a at the axial end of the rotor coil and the spacer support plate 9, and the insulating support 10 is in close contact with the retaining ring insulators 8a, 8b. A spacer support plate 9 was fixed to the end ring 5.
By doing this, an insulating support 10 is provided in the space between the coil 3a at the axial end of the rotor coil and the spacer support plate 9, and this insulating support The object 10 and the spacer support plate 9 are fixed to the end ring 5, and the insulating support 10 and the spacer support plate 9 are held pressed by the thermal expansion of the coil 3a at the end in the axial direction. It is possible to obtain a rotor for a rotating electric machine in which the radial movement of the ring insulations 8a, 8b is restrained and buckling of the retaining ring insulations 8a, 8b can be prevented.

That is, an insulating support 10 was provided between the coil 3a at the axial end and the spacer support plate 9 in close contact with the retaining ring insulations 8a and 8b, and was fixed together with the spacer support plate 9 with an insulating support bolt 11. By doing this, the spacer support plate 9 and the insulating support 10 are firmly fixed to the end ring 5, and the retaining ring insulation 8a, Even if 8b moves in the axial direction (to the right in the figure) and attempts to buckle, it is restrained in the radial direction by the spacer support plate 9 and the insulating support 10, and the retaining ring insulators 8a and 8b are buckled. bending can be prevented. Since the buckling strength can now be increased in this way, the reliability of the rotor can be increased.

〔Effect of the invention〕

As described above, according to the present invention, the buckling of the retaining ring insulation is prevented, and it is possible to obtain a rotor for a rotating electrical machine in which buckling of the retaining ring insulation can be prevented.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional side view around an end ring at an axial end of an embodiment of the rotor of a rotating electric machine of the present invention, FIG. 2 is a perspective view of a rotor of a conventional rotating electric machine, and FIG. A vertical side view of a rotor end of a rotor of a conventional rotating electric machine, FIG. 4 is a sectional view taken along line A-A in FIG. 3,
FIG. 5 is a sectional view taken along the line B--B in FIG. 3, and FIG. 6 is a longitudinal sectional side view of the area around the end ring showing the operation of insulating the retaining ring of the rotor of a conventional rotating electric machine. 1... Rotor, 2... Shaft, 3... Rotor coil, 3a... Coil at the end in the axial direction, 4...
Retaining ring, 5... End ring, 6... Spacer, 8
a, 8b, 8c, 8d...Retaining ring insulation, 9, 9
a, 9b... Spacer support plate, 10... Insulating support, 11... Insulating support bolt.

Claims (1)

[Claims] 1 A retaining ring covering a rotor coil protruding from a rotor core having a shaft, retaining ring insulation provided on the inner surface of the retaining ring between the retaining ring and the rotor coil, and a retaining ring insulation provided on the inner surface of the retaining ring between the retaining ring and the rotor coil; an end ring provided on the inner surface of the rotor coil on the axial end side and holding a retaining ring; and a spacer support plate attached to the axial inner surface of the end ring; In a rotor of a rotating electric machine, the rotor coil is provided with a space between the ring side end of the coil at the ring side end and the ring side end of the retaining ring insulation and the end ring to release the axial extension of the coil and the retaining ring insulation. An insulating support is provided in the space between the axially endmost coil and the spacer support plate, and is in close contact with the retaining ring insulation and has a predetermined space between the endmost coil and the insulating support. A rotor for a rotating electrical machine, characterized in that an object and a spacer support plate are fixed to the end ring.