JPH0328903B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a stator for a rotating electric machine, and more particularly to a stator for a rotating electric machine in which a mechanism for preventing excessive deflection of a stator core support mechanism is improved.

[Technical Background of the Invention and Problems Therewith] A stator of a conventional rotating electrical machine will be explained using a turbine generator as an example with reference to FIGS. 6 and 7. 1 is a stator core, and this stator core 1
encloses the stator winding 2 on its inner circumferential side, and is further tightened by a key bar 3 provided on its back and a presser plate 4 provided on its side. The stator core 1 is elastically supported via a core support plate 5 by a plurality of spring bars 6 arranged around it in the axial direction. Furthermore, this spring bar 6 is fixedly supported by a stator frame 8 via a shelf plate 7. Further, a spring rod 6 is provided near the core support plate 5 in the axial direction.
A partition plate 9 whose outer peripheral side is fixed to the stator frame 8 is provided to prevent excessive deflection of the stator frame 8. On the other hand, holes through which the spring rods 6 pass are bored on the inner circumferential side of the partition plate 9, and stop rings 11 each having an inner diameter 2δ larger than the diameter of the spring rods 6 are attached to each of these holes by welding. It is being Here, δ is a gap equal to the permissible bending amount of the spring bar 6. That is, δ is a value less than the amount of displacement that causes permanent deformation of the spring bar 6, and is arbitrarily set. Further, a cylindrical seal plate 12 is fixed to the outer periphery of the core support plate 5, and this seal plate 12
A sealing material 13 is attached between the partition plate 9 and the partition plate 9.

In the stator of a conventional rotating electric machine having the above-described structure, the vibrations generated in the stator core 1 during operation are absorbed by the spring rods 6. In addition, if a strong impact force is applied to the stator due to a fall during transportation or installation, or if excessive torque is generated due to a short circuit during operation, etc., the stop spring 11
It was possible to prevent the spring rod 6 from being deflected by the gap δ or more due to the contact between the spring rods 6 and 6. However, since the spring bar 6 was in direct contact with the stop ring 11 in order to prevent permanent deformation of the spring bar 6, the spring bar 6 could be scratched.
Furthermore, if the spring bar 6, which absorbs the vibrations of the stator, is scratched, stress will be concentrated, resulting in low reliability. In addition, since the core support plate 5 and the seal plate 12 are installed near the partition plate 9, the structure is complicated, resulting in a narrow space, which makes it extremely difficult to perform welding, cleaning, painting, etc. .

[Object of the Invention] An object of the present invention is to provide a stator for a rotating electrical machine that has a simplified structure and improved reliability.

[Summary of the Invention] In order to achieve the above object, the present invention provides elastic support for a stator core by a plurality of spring bars disposed axially on a circumference near the outer peripheral surface of the stator core via a core support plate. In a rotating electric machine, a diaphragm is installed at a position opposite to the outer periphery of the core support plate, and a diaphragm is installed between the core support plate and the diaphragm to prevent permanent damage caused by twisting due to bending stress of the spring bar and excessive torque in the rotational direction. It is characterized by the provision of a deflection prevention means that forms a predetermined gap to suppress deformation.

[Embodiment of the Invention] Below, Figs. 1 to 3 show an embodiment of the present invention.
This will be explained with reference to the figures. Note that the same parts as in FIGS. 6 and 7 are given the same reference numerals, and their explanations will be omitted. In FIG. 1, reference numeral 1 denotes a stator core, and this stator core 1 is supported and fixed by a spring bar 6 via a core support plate 14. A diaphragm 15 is provided at a position facing the outer periphery of the core support plate 14 via a gap d, and the outer periphery of the diaphragm 15 is fixed to the stator frame 8. FIG. 2 is a sectional view taken along the line -- in FIG. 1. As shown in FIG. 2, the outer circumferential side of the core support plate 14 to which a plurality of spring rods 6 are welded and the inner circumferential side of the partition plate 15 are formed into a hexagonal shape with a gap d interposed therebetween. A sealing material (not shown), such as felt or rubber, is inserted into the gap d to seal the cooling gas. Note that the gap d is set such that the amount of deformation of this sealing material corresponds to the allowable bending amount of the spring bar 6 (=gap δ). That is, the gap d is a value obtained by adding the allowable bending amount of the spring rod 6 (=gap δ) to the value when the sealing material is compressed. Here, the allowable bending amount of the spring bar 6 is a value less than the amount of displacement that causes permanent deformation of the spring bar 6, and is arbitrarily set. Note that a liner 16 as shown in FIG. 3 may be used to adjust the gap d.

Next, the effect will be explained. Spring bar 6 is stator core 1
In addition to being subjected to static loads such as
absorbs vibrations caused by In addition, when the spring bar 6 receives a strong impact load during transportation, installation, or a fall accident, or short-circuit torque due to a short-circuit accident during operation, a large bending stress is generated in the spring bar 6, but the iron core is supported to prevent permanent deformation. The contact between the outer periphery of the plate 14 and the inner periphery of the partition plate 15 prevents the occurrence of deflection exceeding the gap δ. Therefore, the spring rod 6 does not come into direct contact with the partition plate 15, so that no scratches occur. Further, even when excessive torque occurs in the rotational direction, excessive twisting can be prevented by forming the outer periphery of the core support plate 14 and the inner periphery of the partition plate 15 into a hexagonal shape. Furthermore, core support plate 1
4 and the partition plate 15 to face each other, the structure is simplified and no narrow space is created, which improves the efficiency of operations such as welding, cleaning, and painting. Further, the core support plate 14 and the partition plate 15 can be made from the same material, and materials can be used effectively. Furthermore, the mounting position of the cooler of the rotating electrical machine can be brought closer to the stator core 1, and as a result, it is effective for downsizing the rotating electrical machine.

Next, another embodiment of the present invention will be described with reference to FIGS. 4 and 5. In this embodiment, separate L-shaped metal fittings 17 are attached to each of the outer peripheral side of the core support plate 14 and the inner peripheral side of the partition plate 15. By forming a gap δ in the radial and circumferential directions with this L-shaped separate fitting 17, the same effects as in the previous embodiment can be achieved in this embodiment as well. Note that this separate metal fitting 17 is not limited to the L-shape, but may be of a concave-convex shape.

[Effects of the Invention] As explained above, according to the present invention, permanent deformation of the spring bar is reliably prevented, the reliability of the spring bar is improved, and the structure is simplified.As a result, welding, cleaning, painting, etc. It is also possible to improve work efficiency.

[Brief explanation of the drawing]

FIG. 1 is a partial sectional view showing an embodiment of a rotating electrical machine according to the present invention, FIG. 2 is a sectional view taken along the - line in FIG. 1, FIG. 3 is a sectional view of the main part of FIG. 1, and FIG. 5 is a sectional view of a main part showing another embodiment of the present invention, FIG. 5 is a view of FIG. 4 viewed from direction B, FIG. 6 is a partial sectional view showing a stator of a conventional rotating electric machine, FIG. 7 is an enlarged view of section A in FIG. 6. DESCRIPTION OF SYMBOLS 1... Stator core, 6... Spring rod, 14... Stator support plate, 15... Partition plate, 17... Separate metal fittings.

Claims (1)

[Scope of Claims] 1. A rotating electric machine in which a stator core is elastically supported by a plurality of spring bars arranged in the axial direction on the circumference near the outer peripheral surface of the stator core via a core support plate,
A diaphragm is installed at a position facing the outer periphery of the core support plate, and a predetermined space is provided between the core support plate and the diaphragm to suppress permanent deformation due to bending stress of the spring bar and torsion due to excessive torque in the rotational direction. A stator for a rotating electrical machine, characterized in that it is provided with a deflection prevention means that forms a gap. 2. The deflection prevention means consists of a core support plate whose outer periphery is formed into a hexagonal shape, and a partition plate whose inner periphery is formed into a hexagonal shape, and the predetermined gap is formed between the core support plate and the partition. A stator for a rotating electric machine according to claim 1, characterized in that the stator is formed from a plate itself. 3. The deflection prevention means are rotation prevention fittings attached to the outer peripheral side of the core support plate and the inner peripheral side of the partition plate, respectively, and the predetermined gap is formed by the rotation prevention metal fittings. A stator for a rotating electrical machine according to scope 1.