JPS6215015B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a stator for a rotating electrical machine in which a stator frame and a stator core that are divided into a plurality of parts in the circumferential direction are integrally connected.

When a rotating electric machine becomes large, the stator frame and stator core are divided into multiple parts in the circumferential direction.
There are some that are assembled into a ring shape and separated for transportation.

The stator of this type of rotating electrical machine, for example a vertical shaft water turbine generator, is constructed as shown in FIGS. 1 and 2 in a plan sectional view and a vertical sectional view at a divided portion. The figure shows the case of a 6-divided stator. 1 is a 6-divided stator frame, and each divided body 2 has a shelf board 3 with connecting plates 4 and 5 welded together. It is tightened by a connecting bolt 6 and has an integral ring shape. Reference numeral 7 indicates a plurality of core bolts, which are welded and fixed to the inner circumference of the shelf board 3 via supports 8. Reference numeral 9 denotes a stator core divided into six parts in the circumferential direction, each of which has a fan-shaped core plate 10 punched out.
are fitted into the core bolts 7 of each divided body 2 and stacked, and the retaining plates 12 are applied to both ends of the core bolts 7.
It is tightened with a nut 13. 9a is a slot for the stator core 9.

The divided portion A of a conventional stator was as shown in an enlarged cross-sectional view in FIG. Parallel gaps are provided between the divided surfaces of the divided portions of the stator core 9, and an insulating paperboard 14 is inserted.

In assembling the conventional stator described above, the stator core 9
A press board with a thickness of 0.5 to 1 mm is inserted as an insulating paperboard 14 into each divided portion. Thereafter, by tightening each connecting bolt 6 of the divided body 2 of the stator frame 1, the stator core 9 is formed into an annular shape and rigidity is obtained. The insulating paperboard 14 inserted into each divided portion of the stator core 9 is connected to the stator frame 1.
Due to the vibration generated in the circumferential direction between the divided parts of the stator core 9 due to electromagnetic vibration during operation, the divided surfaces of the core plate 10 collide and the interlayer insulation is destroyed. It is used to prevent

In the conventional stator described above, insulating paperboard 14 of uniform thickness is inserted into the gaps between the divided parts of stator core 9, but stator frame 1 on the back of stator core 9 is secured by connecting bolts When tightened and connected, the stator core 9
When tightening in the circumferential direction, the outer circumferential side tended to be tighter and the inner circumferential side tended to be more difficult to tighten. According to actual measurements, the gap between the divided portions of the stator core 9 was zero on the outer circumferential side, but was open on the inner circumferential side. Therefore, the stator core 9 has disadvantages in that the surface pressure at the divided portions is not uniform, the rigidity of the ring is low, and core vibration during operation increases over time.

In this invention, an insulating paperboard having a thickness such that it is thicker on the inner circumference side of the core and becomes thinner toward the outer circumference side is inserted between the divided faces of the divided portion of the stator core,
The object of the present invention is to provide a stator that equalizes the surface pressure of the divided portion between the cores by tightening the stator frame, increases the rigidity of the stator core as an annular ring, and reduces core vibration during operation.

FIG. 4 is an enlarged sectional view corresponding to division A in FIG. 1, showing a stator according to an embodiment of the present invention, and 1 to 10, 9a are the same as those in FIGS. 1 and 2 above. The explanation is omitted. Reference numeral 21 denotes an insulating paperboard inserted between the divided faces of each divided portion of the stator core 9, which is made of, for example, press board, and is formed so that it is thicker on the inner circumferential side with respect to the core and becomes thinner toward the outer circumferential side.

To assemble the stator of the above-described embodiment, a wedge-shaped insulating paperboard 21 is inserted into each divided portion of the stator core 9. After this, each connecting bolt 6 of the divided body 2 of the stator frame 1 is tightened. When the gap between the divided parts of the stator core 9 of the stator assembled in this way was actually measured, it was found that the gap between the divided surface and the insulating paperboard 21 was zero on both the inner and outer circumferential sides, and the surface pressure was found to be uniform. .

Furthermore, the vibration of the stator core 9 during the iron loss temperature rise test during operation was determined in the case of the present invention in which the insulating paperboard 21 was inserted, which was formed to be thicker on the inner circumferential side and thinner toward the outer circumferential side with respect to the iron core. Although it is small and hardly changes over time, in the conventional case where the insulating paperboard 14 of uniform thickness was inserted, it tended to increase over time. This is because, in the present invention, the surface pressure of the divided parts of the stator core 9 is uniform and they are combined, and unlike the conventional method, the surface pressure on the outer circumferential side becomes excessive, causing the insulating paperboard to buckle and tighten. This is because the power will not decrease.

In the above embodiment, a vertical shaft water turbine generator was used as the rotating electric machine, but the invention can be applied to other types of rotating electric machines as long as the stator is divided into multiple parts in the circumferential direction. , the same effects as in the above embodiment can be achieved.

As described above, according to the present invention, an insulating paperboard having a thickness such that it is thicker on the inner circumferential side of the core and becomes thinner toward the outer circumferential side is inserted between each divided portion of the stator core, and the insulating paperboard is fixed. Since each divided part of the child frame is tightened and connected, each divided part of the stator core is tightened with uniform surface pressure, increasing the rigidity of the annular shape, reducing the vibration of the stator core due to operation, and making the insulating paperboard This eliminates local overcompression and prevents fatigue failure.

[Brief explanation of the drawing]

Figure 1 is a schematic cross-sectional plan view of the stator of a vertical shaft type water turbine generator, Figure 2 is a vertical cross-sectional view of the divided portion of the stator in Figure 1, and Figure 3 is a cross-sectional view of the stator of a conventional stator. FIG. 4 is an enlarged sectional view corresponding to section A in FIG. 1, showing a stator according to an embodiment of the present invention. In the figure, 1...Stator frame, 2...Divided body, 6...Joining bolt, 9...Stator core, 10
... Iron core board, 21 ... Insulating paperboard. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Scope of Claims] 1. A stator core in which core plates are laminated and divided through gaps extending in the axial direction relative to the circumferential direction; an insulating paperboard formed to be gradually thinner from the inner circumferential side to the outer circumferential side with respect to the child core; A stator for a rotating electric machine, comprising a stator frame that is tightened and held in a direction and that integrally connects the stator core by tightening and integrating the divided portions of the respective divided bodies.