JPH04101643A - Supporter of rotor winding end - Google Patents

Abstract

PURPOSE:To alleviate a compressive stress which acts on the insulation of the end of a rotor winding for gaining enough tolerance toward damage by winding a bind cord made of glass fiber which contains non-magnetic steel or thermosetting resin on the outer surface of an upper coil and by putting rubber elastic body between the upper and lower coils. CONSTITUTION:Insulated blocks 8 made of glass polyester laminated material are placed between a lower coil 2b and supporting rings 7 whereas rubber elastic bodies 9 which are made of urethane rubber of the JIS hardness 85-90 deg. are put between an upper coil 2a and the lower coil 2b. With a tension being added, a bind cord 1 made of epoxy-impregnated glass fiber is wound on the outer surface of the lower coil 2a. After that, time whole body is heat-cured to support and then secure the end of a rotor winding. A centrifugal force which acts on the end of the lower coil 2b during operation is transmitted to the upper coil 2b, without being concentrated on the corners 4a, 4b of the insulation, to be caught by the bind cord 1.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Field of Application) The present invention relates to a rotor winding end support device for a rotating electrical machine, particularly a large rotating electrical machine having a wound rotor.

(Prior art) In a wound rotor, against the centrifugal force that acts during operation,
The portion of the rotor winding that is housed in the rotor slot is fixed with a slot wedge, and the portion that protrudes from the end of the rotor is made of non-magnetic steel or thermosetting material on its outer peripheral surface, as shown in Figure 7. A bind cord made of resin-impregnated glass fiber or the like was wound and supported under tension. In this case, a laminated material such as glass epoxy or glass polyester is inserted as a spacer between the upper coil (2a) and the lower coil (2b), and the centrifugal force acting on the lower coil (2b) is transferred to the upper coil. (2a).

(Problem to be Solved by the Invention) At the end of such a winding ■, the lower surface (inner peripheral surface) of the upper coil (2a) and the upper surface of the lower coil (2b) face each other with the spacer (3) in between. (outer peripheral surface) is ideally parallel to each other. However, the upper coil (2a) and the lower coil (2b) have their slot portions accommodated in different slots (not shown), and are placed in separate slots! (not shown), the accuracy of the assembly of the rotor core (2) and the individual upper coil (2a) and lower coil (2a)
Depending on the accuracy of the end forming in 2b), the above-mentioned parallelism may not be maintained sufficiently.

In this case, the insulated upper coil (2a) and lower coil (2b) are separated by a spacer (2b) as shown in FIG.
3) and its insulating corners (4a, 4b).

In this case, the centrifugal force acting on the lower coil (2b) is caused by the insulating corner (4b) of the lower coil (2b) and the upper coil (
Upper coil (2a) via the insulating corner (4a) of 2a)
and will ultimately be supported by the bind cord (υ).
) is small, so the insulating corners (4a, 4
b) The compressive stress becomes high. When it comes to the rotor winding of a large rotating electric machine with a large rotor diameter and high per-circumferential speed, the insulation corner (4
a, 4b) the compressive stress exceeds the compressive strength of the insulation),
There is a risk of damaging the insulation.

The present invention has been made in view of the above points, and its purpose is to alleviate the compressive stress acting on the rotor winding end insulation of a large rotating electric machine having a wound rotor. An object of the present invention is to provide a support device for the end portion of the rotor winding, which can ensure sufficient tolerance against damage.

[Structure of the invention]

(Means for Solving the Problems) In order to achieve the above object, the rotor winding end support device of the present invention is provided with a stay provided at the end of the rotor core (2) as shown in FIGS. 1 and 2. The support ring ■ is fixed at 0, and the insulating block (8) is provided between the lower coil (2b) placed around the outer periphery of the support ring ■ and the support ring ■, and the upper coil (2a) is A bind cord ω made of non-magnetic steel or glass fiber impregnated with thermosetting resin is wound around the outer circumferential surface, and a rubber elastic body 0 is arranged between the upper coil (2a) and the lower coil (2b). Configure.

(Function) Since the rotor winding end support device of the present invention is configured as described above, even if the upper coil (2a) and the lower coil (2b) are connected to the insulating corners (4a, 4b) Even if the lower coil (10) is in contact with the rubber elastic body (10) during operation,
The centrifugal force acting on 2b) causes the rubber-based elastic body 2) to undergo bony deformation as shown in Figure 2, increasing the contact area, so the compressive stress acting on the insulating corners (4a, 4b) is alleviated. , insulation) will not be damaged.

(Example) An example of the present invention will be described below with reference to FIGS. 1 and 2.

Rotor slot provided in rotor core■ (not shown)
The iron core of the rotor wire winding (2) housed in the rotor is supported and fixed by a slot wedge (not shown). Also, rotor core 0
A support ring (2) is attached to the inner periphery of the rotor winding (2) protruding from the end of the rotor core (2) via a stay (2) to the end of the rotor core (2). An insulating block (c) made of glass polyester laminated material is laid between the lower coil (2b) and the support ring ■, and urethane rubber with a JIS hardness of 856 to 90'' is used as the rubber elastic body 0 to the upper coil (2a). and lower coil (2b)
Place it between. Thereafter, a bind cord 0) made of glass fiber impregnated with epoxy resin is wound around the outer peripheral surface of the upper coil (2a) while applying tension, and is heated and hardened to support and fix the end of the rotor winding.

The most important feature of urethane rubber is its excellent mechanical properties.6 Even with high hardness like the one in this example, where ordinary rubber loses most of its rubber-like elasticity, it can still function as an elastic body. keeping. According to this embodiment, the centrifugal force acting on the end of the lower coil (2b) during operation is absorbed by the insulating corners (4a, 4b) due to the effect of the rubber-like elastic body (b).
) is transmitted to the second coil (2a) and supported by the bind cord (0). Therefore, a highly reliable rotor winding (2) that does not damage the insulating corner portions (4a, 4b) can be obtained.

As a modification of the above embodiment, the same effect can be obtained by pasting the rubber-based elastic body 11g in FIG. 2 on both sides of the laminate material that is the conventional spacer (3) as shown in FIG.

As shown in FIG. 4, grooves (10) for fitting the upper coil (2a) and lower coil (2b) are provided in the rubber elastic body 0 of FIG. By integrating the individual rubber and system elastic bodies 0 arranged in a certain rotor axial direction as shown in FIG. 5, the positioning work can be simplified.

Furthermore, as shown in Fig. 6, the upper coil (2a) and lower coil (2b) are fastened to the support ring ■ by passing the bind cord (υ) through the gap between the coils (2a, 2b) adjacent to each other in the circumferential direction of the rotor. It is also effective in cases where

〔Effect of the invention〕

As described above, according to the present invention, a rubber elastic body is arranged between the upper coil and the lower coil, and the outer peripheral surface of the upper coil is made of non-magnetic steel or glass fiber impregnated with thermosetting resin. Since the rotor is wound and fastened with a bind cord, the centrifugal force that acts during operation does not concentrate on the insulating corners due to the effect of the rubber-like elastic body, which prevents damage to the insulating corners.A highly reliable rotor. Windings can be provided.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of a rotor end equipped with a rotor winding end support device according to an embodiment of the present invention, and FIG.
A N-“A” cross-sectional arrow view, FIGS. 3 and 4 are rotor winding end support devices according to other embodiments of the present invention, and FIGS.
6 and 6 are configuration diagrams of a rotor end equipped with a rotor winding end support device according to another embodiment of the present invention, and FIG. 7 is a configuration diagram of a conventional winding rotor end. , Figure 8 shows the "
B”-rz BN shows a cross-sectional view taken in the direction of arrows. 1... Bind cord 2... Rotor winding 2a.
...Upper coil 2b...Lower coil 3...
Spacer 4...Insulation 4a...Upper coil insulation corner 4b...Lower coil insulation corner 5...Rotor core 6...Stay 7...Support ring 8...Insulation block 9 ... Rubber-based elastic body 10 ... Groove agent Patent attorney Noriyuki Chika Figure 3 Figure 1 Figure 4 Figure 6 Stage Figure 2 Figure 5 Figure

Claims (2)

[Claims] (1) Comprising a support ring fixed to the end of the rotor core, an upper coil and a lower coil arranged around the outer periphery of the support ring, and a rubber-based elastic material between the upper coil and the lower coil. A rotor winding end support device characterized in that the outer peripheral surface of the upper coil is wound and fastened with a bind cord made of non-magnetic steel or glass fiber impregnated with a thermosetting resin. (2) A patent characterized in that the bind cord is passed through the gap between the coils adjacent to each other in the circumferential direction of the rotor, and the upper coil and the lower coil as well as the rubber elastic body disposed between them are fastened to the support ring. A rotor winding end support device according to claim (1).