JPS58175943A - Rotor for rotary electric machine - Google Patents

Abstract

PURPOSE:To reduce the size and weight of a rotor for a rotary electric machine and to improve the cooling effect of the machine by adhering a slot insulator to the wall of the slot, thereby preventing the inserting scratch of the slot insulator in case of containing a rotor coil in the slot and reducing the thickness of the insulator. CONSTITUTION:U-shaped slot insulators 3 adhered to the inner walls of a plurality of axial slots 2 of a cylindrical core 1, a rotor coil 4 in which an insulator between the turns of coils is interposed, is contained in the slot, and the top of a rotor coil 4 is retained by a wedge 7 through an insulator 6 under the wedge. The insulator 3 employ an insulating film having excellent electric insulation with aramid paper having strong mechanical deterioration resistance bonded on both sides surfaces. Further, a coating layer 10 adhered by electrostatic coating with epoxy resin on the wall of the slot 2, and a protecting layer 11 made of a glass cloth inserted inside the layer 10 may be used to compose the insulator 3.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a rotor for a rotating electric machine in which the slot insulator is relatively thin, resistant to mechanical deterioration, and has good electrical insulation properties.

[Technical background of the invention and its problems]

The slot insulator of the rotor of a rotating electric machine having a cylindrical rotor, such as a turbine generator, is required to have sufficient electrical insulation properties and to withstand mechanical loads. Conventionally, a structure was used in which a mica laminated sheet was processed into the same shape as the slot and inserted into the slot, but the mechanical properties of the mica laminated sheet were not satisfactory for ultra-large rotors. . Recently, laminated insulating sheets using glass filament or glass cloth have been developed, and compared to mica laminated sheets,
Although the mechanical properties have been significantly improved, there is still a drawback that cracks are likely to occur due to force in a specific direction, and there is a possibility that damage may occur when inserting the rotor coil into the slot. The rounding and insulation thickness could not be made thinner, the heat transfer rate from the rotor coil to the iron core was poor, and the space factor of the coil conductors was also small, making it difficult to reduce the size and weight of the rotor.

[Purpose of the invention]

The present invention maintains the electrical insulation properties of the slot insulator, withstands mechanical loads, and! l! When inserting the iK rotor coil into the slot, the slot insulator will not be damaged or deformed, and the thickness of the slot insulator can be made thinner to make it smaller and lighter, resulting in highly reliable rotation. The purpose is to provide rotors for electrical machinery.

[Summary of the invention]

The present invention is characterized in that the slot insulator is attached to the slot wall, and the slot insulator attached to the slot wall is made of an insulating film with aramid paper bonded to both sides with an adhesive. This is adhered to the slot wall with adhesive, or a coating layer is made by adhering epoxy resin to electrostatic coating, and the latter is further coated with glass cloth on the inside to form the slot when the rotor coil is housed in the slot. The present invention provides a highly reliable rotor for a rotating electric machine that does not cause damage or deformation of the insulator, maintains electrical insulation properties, withstands mechanical loads, is compact and lightweight.

[Embodiments of the invention]

Embodiment 1 Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. 1 to 3.

A plurality of axial slots (2) (only one is shown in FIG. 1) are provided in the cylindrical rotor core (1), and a U-shaped slot insulator (3), which will be described later, is attached to the inner wall of the slot. The rotor coil (4) is housed in it, and this rotor coil (4)
An inter-turn insulator (5) is interposed between the turns, and the upper part of the rotor coil (4) is held down by # (7) via a wedge insulator (6).

However, as shown in Figure 2, the slot insulator (3) of the lever is an insulating film (8) with excellent electrical insulation properties such as Kapton (trade name manufactured by DuPont) or Lumirror (trade name manufactured by Toshisha Co., Ltd.). ) is coated with aramid paper that is resistant to mechanical deterioration (
9) (For example, DuPont product name Nomex sheet)
Then, as shown in FIG. 3, the other parts are attached to the wall of the slot (2) using the adhesive described below. The above adhesive contains a bisphenol A type resin (for example, Epicoat Bp828 manufactured by Shell Co., Ltd.), a methyl group methyl indazole (for example, 24 Imidacil manufactured by Shikoku Kasei Co., Ltd.), and silicate powder in a weight ratio of 100:3L5:50. Sweet potato,
I used the.

Next, the effect will be explained.

Insulating films (8) such as Kapton and Lumirror are thin and have excellent electrical insulation properties. However, the mechanical strength of the insulating film (8) alone is weak, and damage occurs when the coil is inserted. Aramid paper (9) such as Nomex sheet is thin and has excellent mechanical strength. Therefore, by laminating aramid paper (9) on both sides of the insulating film (8), the nine-slot insulator (3) has superior strength both electrically and mechanically. Furthermore, since this is adhered to the wall of the slot (2), there is no risk of damaging the slot insulator (3) when inserting the coil. And this slot insulator (
3) is thin, so it can be easily attached to any shape of the slot (2), and there is no need to form the ground insulator to fit the slot shape as in the conventional case. Moreover, as mentioned above, since the slot insulator (3) is thin, the space factor of the conductor in the slot of the -trochanter coil (4) is greatly improved, and the thermoelectric transfer coefficient is also improved. This improves cooling performance, making it possible to make the rotor smaller and lighter.

Example 2 Next, a second example will be described with reference to FIG. 4.

This is applied to the wall of the slot (2) with epoxy resin 260 (3
(Product name manufactured by M Company) and NPC360C (Product name manufactured by Mitsubishi Chemical Corporation)
A coating layer is applied by electrostatic coating with an epoxy resin such as epoxy resin. A protective layer made of glass cloth is inserted inside it. The rest is the same as in Example 1.

Next, the effect will be explained.

Epoxy resin QloJe edge strength is 20-40 kV/
+w if>, therefore, the insulation coating of the epoxy resin α1 has a dielectric strength of 5 to 10 kV when the thickness is about 025 mm. Since the adhesive is attached by electrostatic coating, the slot may have any shape. Since a protective layer at+ is inserted inside this epoxy resin coating layer 01,
This will protect the coating layer from mechanical impact. This protective layer αυ has the same shape as a conventional ground insulator, but since the ground insulation is handled by the epoxy resin coating layer, the coating layer H is simply protected from mechanical stress such as damage caused when inserting the coil. Just protect it. Therefore, the protective layer Qυ can be made thinner, and in combination with the thin film layer thickness, the space factor of the conductor in the slot of the rotor coil (4) is greatly improved, and the heat transfer coefficient is also improved, resulting in cooling performance. This makes it possible to make the rotor smaller and lighter.

Note that the present invention is not limited to the embodiments described above and shown in the drawings; for example, other adhesives may be used as the adhesive, and the protective layer I may also be made of other materials. It goes without saying that the invention can be modified and implemented in various ways without changing the gist of the invention.

〔Effect of the invention〕

As explained above, according to the present invention, since the slot insulator is attached to the slot wall, when the rotor coil is inserted into the slot, the slot insulator is not damaged. Since the wall thickness is extremely thin, the heat transfer coefficient is good, and therefore, it is possible to provide a rotor for a rotating electric machine that is compact and lightweight, and has high reliability.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing a slot portion of a first embodiment of a rotor for a rotating electrical machine according to the present invention, FIG. 2 is an enlarged cross-sectional view of a main part showing the slot insulator of FIG. 1, and FIG. is a cross-sectional view showing the slot insulator of FIG. 2 attached to the slot wall, and FIG. 4 is a cross-sectional view showing the slot insulator of the second embodiment attached to the slot wall. . l... Rotor core 2... Slot 3/Slot insulator 4... Rotor coil 8... Insulating film 9... Aramid paper 10... Coating layer 11... Maintenance layer agent Patent Attorney I
Top - Male Figure 1 Figure 3 Figure 4 Figure I

Claims (3)

[Claims] (1) In a rotor of a nine-rotary electric machine, a cylindrical rotor core is provided with a plurality of axial slots, a rotor coil is housed in the slot, and the rotor coil and rotor core are insulated with a slot insulator. A rotor for a rotating electrical machine, characterized in that a slot insulator is attached to a slot wall. (2) The slot insulator attached to the slot wall is made of an insulating film with aramid paper bonded to both sides with an adhesive, and this is bonded to the slot wall with an adhesive. The rotor of the rotating electric machine described in Section 1. (3) The slot insulator attached to slot l1llK is
Epoxy resin is attached by electrostatic coating to form a nine-layer layer,
A rotor for a rotating electric machine according to claim 1, further comprising a protective layer made of glass cloth inserted inside the rotor.