JPH05300683A - Rotor of electric rotating machine - Google Patents

Abstract

PURPOSE:To provide a rotor for an electric rotating machine, wherein the turn insulating material never exfoliates, breaks, or slips out of place to cause interlayer short circuit even if the adhesive strength drops by the thermal expansion and shrinkage of winding by start, stop, or load fluctuation. CONSTITUTION:In the rotor of an electric rotating machine, where a coil 2 is accommodated in the iron core's slot 1 through a slot insulator 4, a turn insulating material 3 consisting of synthetic resin containing glass fiber base material is inserted between the turns of the coil 2, and an L-shaped tetrafluoroethylene sheet 7 small in dynamic frictional coefficient is arranged between the turn insulating material 3 and the coil 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotor of a rotary electric machine, and more particularly to insulation of a rotor coil of a turbine generator.

[0002]

2. Description of the Related Art Generally, in a rotor of a rotary electric machine, particularly a turbine generator, a coil 2 for supplying a current necessary for generating a field magnetic field is provided in an iron core slot 1 as shown in FIG. A turn insulating material 3 made of a synthetic resin containing a glass fiber base material, which is arranged between the coils 2 and electrically insulates between the turns, and a slot insulation 4 which insulates the ground of the coil 2 from the ground are provided to the side surface of the insulating block 5. It is stored so as to cover it. The turn insulating material 3 is bonded and fixed to one surface between the turns of the coil 2 with a heat resistant synthetic resin.
When the rotor further rotates, a wedge 6 is provided in the upper portion of the iron core slot 1 by cutting a groove so that the coil 2 does not jump out of the iron core slot 1.
An insulating block 5 is provided between and to electrically insulate the space.

[0003]

However, with such a conventional rotor coil insulation structure, the adhesive force of the synthetic resin that adheres and fixes the coil and the turn insulating material by the heat during operation of the rotating electric machine. The turn insulation material peels off due to thermal expansion and contraction of the coil due to start-up, stop, and load fluctuations, and the turn insulation material may be broken or misaligned to cause an interlayer short circuit. The present invention has been made in view of the above problems, and the adhesive strength of the synthetic resin that adheres and fixes the turn insulating material during long-term operation is reduced, and even if the turn insulating material peels off due to thermal expansion and contraction of the coil, it breaks. An object of the present invention is to provide a rotor of a rotating electric machine having high reliability that does not cause misalignment and does not cause interlayer short circuit.

[0004]

In order to achieve the above object, in the present invention, a coil is housed through the iron core slot insulation of the rotor, and a wedge is arranged on the coil through a cripage block. In a rotor of a rotating electric machine, a turn insulating material made of a synthetic resin containing a glass fiber base material is inserted and fixed between each turn of the coil, and at least one place between the turn insulating material and the coil has a small dynamic friction coefficient I. Insulate by placing a U-shaped or U-shaped tetrafluoroethylene sheet.

[0005]

In the rotor of the rotating electric machine of the present invention configured as described above, the adhesive force of the synthetic resin for adhesively fixing the coil and the turn insulating material is lowered by the heat during operation, and the starting,
Even if thermal expansion and contraction of the coil occur due to stoppage and load fluctuations, the tetrafluoroethylene sheet provided on the turn insulation material has a small dynamic friction coefficient, so the turn insulation material does not peel off, slip, or fold. . Further, since the tetrafluoroethylene sheet is processed into an I-shape, it can be electrically insulated without jumping out from between the coils due to creep.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a cross section of an iron core slot of a rotor of a rotary electric machine manufactured according to this embodiment, and FIG. 2 shows A of FIG.
3 is an enlarged view of a part of the rotor coil of the part. A coil 2 for passing a current necessary for generating a field magnetic field in the iron core slot 1, and a turn insulation made of a synthetic resin containing a glass fiber base material, which is arranged between the coils 2 and electrically insulates between the turns. The material 3 and the slot insulation 4 that insulates the coil 2 from the ground are housed so as to cover the side surface of the insulating block 5. The turn insulating material 3 is adhered and fixed to one surface between the turns of the coil 2 with a heat-resistant synthetic resin. An I-shaped tetrafluoroethylene sheet 7 formed by injection molding of PFA (tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer) having a small dynamic friction coefficient is disposed on the turn insulating material 3. When the rotor further rotates, a groove is cut in the upper portion of the iron core slot 1 so that the coil 2 does not jump out of the iron core slot 1, and the wedge 6
An insulating block 5 for electrically insulating the wedge 6 and the coil 2 is provided between the wedge 6 and the coil 2.
According to the present embodiment, by disposing the I-shaped tetrafluoroethylene sheet 7 having a small dynamic friction coefficient on the turn insulating material 3 adhered and fixed to one surface between the coils 2, the coil 2 and the turns are heated by the heat during operation. The adhesive force of the synthetic resin that adheres and fixes the insulating material 3 decreases, causing thermal expansion and contraction of the coil 2 due to start, stop, and load changes, and the turn insulating material 3 may slip or break even if peeled off. There is no. Further, since the tetrafluoroethylene sheet 7 is processed into an I-shape, it is possible to electrically insulate the sheet from the coils 2 without creeping it out.

In the above embodiment, the I-shaped tetrafluoroethylene sheet 7 is arranged on the turn insulating material 3. However, as shown in FIG. 3, the above-mentioned PFA is processed by injection molding into a U-shaped tetrafluoroethylene sheet 7. Fluoroethylene sheet 8
A turn insulating material 3 adhered and fixed to one side between the coils 2.
Even if it is arranged above, the same effect as that of the above-mentioned embodiment can be obtained.

[0008]

As described above, according to the present invention, the I-shaped tetrafluoroethylene sheet having a small dynamic friction coefficient is simply arranged on the turn insulating material which is adhesively fixed to one surface between the coils of the rotor. (EN) Provided is a rotor of a rotating electric machine having a relatively simple structure, which does not cause breakage or displacement even if the turn insulating material is peeled off due to thermal expansion and contraction of a coil and does not cause interlayer short-circuiting. You can

[Brief description of drawings]

FIG. 1 is a sectional view of a slot portion of a rotor core of a rotating electric machine manufactured by a method according to an embodiment of the present invention.

FIG. 2 is an enlarged view of part A of FIG.

FIG. 3 is an enlarged view of part A showing another embodiment of the present invention.

FIG. 4 is a sectional view of a slot portion of a conventional rotor core.

[Explanation of symbols]

 1 ... Iron core slot 2 ... Coil 3 ... Turn insulation 4 ... Slot insulation 5 ... Insulation block 6 ... Wedge 7 ... I-shaped tetrafluoroethylene sheet 8 ... U-shaped tetrafluoroethylene sheet

Claims (1)

[Claims] 1. A rotary electric machine in which a coil is housed in a core slot of a rotor via slot insulation, and a wedge is arranged on the coil via a cripage block, and a glass fiber is provided between each turn of the coil. Inserting a turn insulation material made of synthetic resin containing a base material, and fixing and fixing a tetrafluoroethylene sheet processed into an I or U shape with a small dynamic friction coefficient in at least one place between the turn insulation material and the coil. The rotor of the rotating electric machine that features.