JPS58172946A - Rotor for rotary electric machine - Google Patents

Abstract

PURPOSE:To improve the mechanical strength, flexibility, withstand voltage characteristic and heat conductive characteristic of a rotary electric machine by integrating aramid paper of inside with carbon fiber of outside with adhesive as slot insulator, thereby reducing the thickness of the insulator. CONSTITUTION:An U-shaped slot insulator 4 is inserted into the axial slot 2 of a cylindrical rotor core 1, a rotor coil 4 in which an insulator 4 between the turns is interposed in the insulator 4, is contained in the slot 2, and the top of the coil 4 is retained via an insulator 6 under a wedge 7 with the wedge 7. The insulator 4 is integrated by disposing aramid paper 8 which has excellent withstand voltage and heat insulating characteristics such as nomex inside and carbon fiber 9 having excellent mechanical strength, and adhering both with epoxy adhesive 10, e.g., bis-phenol A type resin and novolak epoxy resin as hardener mixed with amine complex.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a rotor for a rotating electrical machine in which a slot insulator is made relatively thin and has good mechanical strength and withstand voltage characteristics.

[Technical background of the invention]

Electrical equipment, especially the rotor of a turbine generator, requires that the laminated insulating sheet used for the slot insulator of the rotor coil have sufficient electrical insulation properties and withstand mechanical loads;
Furthermore, it is required to be as thin as possible in order to transfer heat and improve the conductor space factor.

For example, synthetic resin reinforced with glass fibers has conventionally been used as slot insulators for rotor coils of turbine generators.

[Problems with background technology]

However, as the thickness of this glass fiber-reinforced synthetic resin slot insulator becomes thinner, its mechanical strength becomes weaker, and at the same time, its voltage resistance also deteriorates. Therefore, there is a need for an efficient and reliable rotor for a rotating electric machine that can withstand shock during assembly and centrifugal force during rotation, has a thin wall, has a slot insulator, and has a thin wall.

[Purpose of the invention]

The object of the present invention is to have a thin wall thickness in order to improve heat transfer and conductor space factor, have mechanical strength as a structure, be flexible, and have high withstand voltage characteristics in the thickness direction. An object of the present invention is to provide a rotor for a rotating electrical machine that has excellent slot insulators, is highly reliable, and does not become large in size.

[Summary of the invention]

In the present invention, a rotor for a rotating electric machine is provided in which 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. In this method, the slot insulator is made of aramid paper with carbon fibers bonded with adhesive, and the carbon fibers are distributed to the slot wall so that the wall thickness is thin and the mechanical strength of the structure is improved. The slot insulator is strong, flexible, and has excellent withstand voltage characteristics.

[Embodiment of the Invention] Hereinafter, an embodiment of the present invention will be described with reference to FIG.
This will be explained with reference to the figures.

A plurality of axial slots (2) (only one is shown in Figure 1) are provided in the cylindrical rotor core (1), and U-shaped slot insulators (3), which will be described later, are inserted into the slots. A rotor coil (4) is housed in the rotor coil (4), and an inter-turn insulator (5) is interposed between the turns of this rotor coil (4), and an ink insulator (6) is placed in the upper part of the rotor coil (4). through the wedge (7
).

Therefore, this slot insulator (3) is made of aramid paper (8) with excellent voltage resistance and heat resistance (for example, Nomex sheet manufactured by DuPont) on the inside, and carbon fiber (9) with excellent mechanical properties. ) on the outside, and using both (8) and (9) as epoxy adhesive 01, use bisphenol AJ Ig resin (Example 1t, trade name Epicoat UP 828 manufactured by Hasiel Corporation) and novolac epoxy resin (for example, trade name manufactured by Dow Corporation). DEN 431), BP as a curing agent, and an amine complex (for example, Hashimoto Kasei Co., Ltd. trade name BP, 400) mixed together to form an integral structure.

Next, the effect will be explained.

The slot insulator (3) has an inner aramid paper (8) with excellent voltage resistance and heat resistance in contact with the rotor coil (4), and has mechanical properties on the outer circumference side, that is, on the wall side of the slot (2). Since the excellent carbon fibers (9) are bonded together using epoxy adhesive OI, the slot insulator (3) K is thinner than conventional ones, resulting in better electrical, mechanical,
It has heat transfer properties and improves the conductor space factor. Therefore, this slot insulator (3) is less likely to be damaged by bending or compression when inserted into the slot (2), or by the impact force applied when inserting the rotor coil (4), leading to improved quality. In terms of work, it is easier to handle, helps improve workability, and provides a rotor for a rotating electric machine that is highly reliable and does not become large in size.

It should be noted that the present invention is not limited to the embodiments described above and shown in the drawings, but may include the following without changing the gist thereof:
Of course, it can be implemented with various modifications.

〔Effect of the invention〕

As described above, according to the present invention, by providing a slot insulator in which aramid paper is placed inside, carbon fiber (- is placed outside @11, and these are integrated with adhesive),
It has excellent electrical, mechanical, and thermal properties, and has an improved conductor space factor.
It is possible to provide a rotor for a rotating electric machine that has excellent heat transfer and cooling properties, good workability, high reliability, and does not become large in size.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing a slot portion of an embodiment of a rotor of a rotating electrical machine of the present invention, FIG. 2 is a perspective view showing a slot insulator shown in FIG. 1, and FIG. 3 is a 111 shown in FIG. -IIIM
FIG. 1... Rotor core 2... Slot 3... Slot insulator 4... Rotor coil 8... Aramid paper 9... Carbon fiber (-10... Adhesive agent Patent attorney Inoue - Male

Claims (2)

[Claims] (1) In a rotor of a rotating 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, 9. A rotor for a rotating electrical machine, characterized in that the slot insulator is made of aramid paper bonded with carbon fibers using an adhesive, and the carbon fibers are arranged on the slot wall side. (2) A rotor for a rotating electric machine according to claim 1, wherein a Nomex sheet is used as the aramid paper, and an epoxy adhesive is used as the adhesive.