JPS5983550A - rotor of rotating electric machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a rotor of a rotating electric machine, and in particular to a rotor wound around a rotor body integral with a rotating shaft, and whose end portions have a gap in the axial direction. The present invention relates to a rotor for a rotating electrical machine that has a plurality of wound rotor coils and a retaining ring that covers the outer periphery of the end portions of these rotor coils with a silk insulation layer interposed therebetween.

[Prior art]

A conventional example of a rotor for a turbine generator is shown in FIGS. 1 and 2. As shown in the figure, the rotor 1 is formed by winding a rotor coil 3 around a rotor body 2a that is integrated with a rotating shaft 2, and the rotor coil 3 prevents the rotor coil 3 from flying out during operation. An inter-coil spacer 5 made of an insulating material is provided at the end of the rotation 7r, 3 (end coil 3a), and a silk-covered insulating layer 6 is interposed on the outer periphery of the inter-coil spacer 5. A shrink-fitted retaining ring 8 is provided. The inter-coil spacer 5 prevents movement between the end coils 3a, the silk insulation layer 6 is for ground insulation, and the retaining ring 8 protects the end coil 3a from centrifugal force. . Further, in order to cool the rotor coil 3, a ventilation hole 9 is provided in the centering ring 7, and an air wedge 4b is provided in the slot of the rotor body 2a. In the figure, 10 is a coupling for direct connection to the turbine, and 11 is a slip ring for allowing electricity to flow through the rotor coil 3.

In the rotor 1 configured in this manner, the rotor coil 3 has also become longer as the capacity of a turbine generator, especially a turbine generator for thermal power generation, has increased, and deformation of the end coil 3a has become a problem. However, the following factors may be responsible for this deformation. The stress generated when the so-called thermal expansion of the slot-inside portion of the rotor coil 3 and the end coil 3a portion is restrained by the inter-coil spacer 5 becomes large enough to reach a plastic region, and the rotor Since the rotor 1 itself is long and bends, bending stress is generated each time the rotor 1 rotates. The centrifugal force of a portion of the end coil 3a deforms the retaining ring 8 into an elliptical shape, and stress is applied thereto. The deformation of the end coil 38 is relatively small when the length of the end coil 3a is short, but the deformation is large when the end coil 3a is long. The deformation at the bent portion is significant, and such deformation is largely due to the fact that the retaining ring 8 is deformed into an elliptical shape due to centrifugal force among the deformation factors mentioned above.

Therefore, in order to prevent this deformation, as shown in FIGS. 4 and 5, in the past, an As shown, a coating layer 12 of polytetrafluoroethylene, which is a sliding layer, is provided to allow the end coil 3a to slide against the elliptical deformation of the retaining ring 8, thereby reducing the restraining force caused by the deformation. Ta. That is, the coefficient of friction between the torso insulating layer 6 and the end coil 3a is about 0.2 to 0.3, but by providing the coating layer 12 of polytetrafluoroethylene, the coefficient of friction can be reduced from 0.05 to 0. .1, and the restraining force due to the deformation of the retaining ring 8 is reduced to the end coil 3a.
The stress was reduced to a point where the parts did not deform. However, such deformation prevention was effective after several years of operation, and almost no deformation was observed in the end coil 3a portion, but deformation was observed after several years had passed. This is because the particles of polytetrafluoroethylene forming the coating layer 12 fall due to friction with the end coil 3a.

[Purpose of the invention]

The present invention has been made in view of the above points, and an object of the present invention is to provide a rotor for a rotating electric machine in which deformation of the end coil portion can be prevented over a long period of time.

[Summary of the invention]

That is, the present invention provides a lubricant made of polytetrafluoroethylene.
The present invention is characterized in that the layer is provided within the trunk insulation layer or between the copper-clad insulation layer and the retaining ring.

[Embodiments of the invention]

The present invention will be explained below based on the illustrated embodiments. FIG. 6 shows an embodiment of the invention. Note that parts that are the same as those in the conventional model are given the same reference numerals, and therefore their explanations will be omitted. In this embodiment, the sliding layers 1 and 2 are made of polytetrafluoroethylene.
a was provided in the torso insulating layer 6. That is, the lubricant layer 12a
As shown by the marks in the figure, the silk insulation layer 6a is
, 6b, and the polytetrafluoroethylene was formed in the form of a sheet (sheet of polytetrafluoroethylene) or particulate (coating layer of polytetrafluoroethylene). By doing this, the sliding layer 12a is sealed within the torso insulating layers 6a, 6b, and the sliding layer 12a does not fall off due to friction with the end coil 3a, as in the conventional case, and the sliding layer 12a lasts for a long time. 12a can be maintained, and deformation of the end coil portion 3a over a long period of time can be prevented.

Another embodiment of the invention is shown in FIG.

In this embodiment, the slipping layer 12 made of polytetrafluoroethylene
A was provided between the torso insulating layer 6 and the retaining ring 8. In this case as well, the sliding layer 12a is sealed between the copper-clad insulating layer 6 and the retaining ring 8, and the same effects as in the above case can be achieved.

〔Effect of the invention〕

As mentioned above, the lubricant layer made of polytetrafluoroethylene in the present invention is provided within the copper-clad insulating layer or between the trunk insulating layer and the retaining ring, so that the lubricant layer is sealed. hand,
A rotating electrical machine that maintains its function as a slipping layer for a long period of time without causing particles of polytetrafluoroethyl ethylene chloride to fall off as in the past, and prevents deformation of the end coil portion over a long period of time. rotor can be obtained.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a rotor of a conventional rotating electrical machine, Fig. 2 is a perspective view of an end coil portion of a rotor of a conventional rotating electrical machine, and Fig. 3 is a perspective view of a rotor of a conventional rotating electrical machine.
The figure is an explanatory diagram illustrating the deformed state of the end coil portion of the rotor of a conventional rotating electric machine, FIG. 4 is a sectional view of the end coil portion of the rotor of a conventional rotating electric machine, and FIG. FIG. 6 is a perspective view of a trunk insulating layer provided with a sliding layer of a rotor; FIG. 6 is a perspective view of a trunk insulating layer provided with a sliding layer of an embodiment of the rotor of a rotating electrical machine of the present invention; FIG. It is a sectional view of the end coil part of other examples of the rotor of the rotary electric machine of the present invention. 2... Rotating shaft, 2a... Rotor body, 3... Rotor coil, 3a... End coil, 6 (6a, 6b
)... Trunk insulating layer, 8... Retaining ring, 12a...
Poly Yotsufutsu (and 1 other person) Part 1 (2) Figure 2 Fan 3rd Condolence 60

Claims (1)

[Scope of Claims] 11 A plurality of rotor coils wound around a rotor body integral with a rotating shaft, the ends of which are wound with gaps in the axial direction, and the ends of these rotor coils. and a retaining ring covering the outer periphery of the rotor with a trunk insulating layer interposed therebetween, and a sliding layer made of polytetrafluoroethylene is provided between the retaining ring and the rotor coil. A rotor for a rotating electrical machine, characterized in that a lubricant layer made of polytetrafluoroethylene is provided within the mesh insulation layer or between the silk insulation layer and the retaining ring. 2. The rotor of a rotating electrical machine according to claim 1, wherein the lubricating layer made of polytetrafluoroethylene is formed of sheet-like or particulate polytetrafluoroethylene.