JPH0145831B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to an improvement in a method for assembling a split stator of a rotating electric machine.

(Prior art) The stator of a large rotating electrical machine such as a water turbine generator is
Due to transportation restrictions, geographical conditions, or structural conditions of the electric machine, the first and second coils of a rotating electric machine are installed with the coil 6 wound in two layers on the completed stator as shown in Figure 1. The divided stators 1 and 2 may be divided into two parts at the dividing plane 3, or divided into two or more parts, and then transported to the site. When transporting the stator by dividing it in this way, the dividing surface 3 of the divided stator
After removing the stator coils with distributed windings that span the parts and joining the divided surfaces, the coils of these divided parts are installed. However, according to this method,
As shown in FIGS. 2a and 2b, in order to mount the coil that spans the split surface 3 of the first and second split stators 1 and 2, that is, the removed coil that should be placed in the empty slot 5, , it is necessary to sequentially pull up the adjacent coils into the space on the inner surface 4 side of the stator, that is, to lift the coils. This fried coil is coil 1 installed in slot 5.
1 is gradually pulled up above the slot 5 as it approaches the dividing surface 3 of the stator as indicated by 11'.
The lower coil of the removed coil is passed through the slot 5 as a coil spanning the dividing surface 3.
It is pulled up to a size a that will allow for easy insertion. The height of the cross section of the fried coil 11' is h
If α is the margin, then a=h+α, and since α is usually 10 to 15 mm, the dimensions are quite large. Therefore, the lower coil 8' of the lifted coil 11' pulled up into the space on the inner surface 4 side of the stator is restrained within the slot 5, and bending stress and twisting stress are continuously applied, which poses the risk of damaging the coil insulation. is large.

In addition, a method of integrating the stators by sliding one of the divided stators sideways while completely installing the coils that span the divided surfaces of the stator is described in the Japanese Patent Publication No. 39-
There is a publication number 23116. This method uses one side of the coil,
That is, the lower coil is fixed in the split stator slot,
This is a method of inserting a coil located on the other side, that is, a space, into the slot while moving the other divided stator, and the cost of a fine movement device for moving the divided stator, angle adjustment, etc. is enormous. or,
Since the coils are fixed, there is no degree of freedom in the coils, and the greatest attention and operator skill is required to move the split stator.

(Problems to be Solved by the Invention) Therefore, there has been a demand for the development of a highly reliable, inexpensive, and easy assembly method.

The present invention has been made in view of the above-mentioned drawbacks, and it is an object of the present invention to provide a method for assembling a split stator for a rotating electric machine that can be easily performed at low cost and with high reliability without damaging the insulation of the coil.

[Structure of the invention]

(Means for Solving the Problems) In order to achieve the above object, in the present invention, all the coils including the coils spanning the dividing plane of the stator are attached to each divided stator, and the stator When assembling the stator, the designated lower coil is struck from below and moved upward together with the upper coil, and a small amount of coiling is carried out to fit the guide plate that guides the upper coil to the inner surface of the stator that spans the split plane. To provide a method for assembling a split stator for a rotating electric machine, which comprises: joining the split surfaces using the guide plate as a guide, and then removing the guide plate and assembling the coil moved in the direction into the slot.

(Function) According to the method configured as above, although a frying coil is formed, there is no conventional coil to be passed under the frying coil, so the lifting dimension a is small enough to fit a guide plate. In other words, only about 0.5 mm is sufficient.
Therefore, the method for assembling a split stator for a rotating electrical machine is highly reliable, inexpensive, and easy to perform without damaging the coil insulation.

(Example) Hereinafter, an example of the present invention will be described with reference to FIGS. 3 to 8.

FIG. 3 shows a solid divided stator divided into two parts, and with respect to the slots 5 of both divided stators 1 and 2, the coils 6 are inserted into all the slots 5, including the coil 7 that spans the dividing surface 3. , the slot wedge (not shown) and the coil end are not fixed to the coil 7 spanning the dividing surface 3 and the lower coil 8 connected thereto, but they are temporarily fixed to the extent that they can withstand the vibrations during on-site transportation, and other coils are Perform normal wiring and fixing. This will be transported to the site and assembled.

During assembly, the first divided stator 1 is installed in a regular position, and the second divided stator 2 is temporarily placed in another position. The temporary fixation of the coil 7 spanning the dividing surface 3 of both divided stators 1 and 2 is released. At this time, a pedestal (not shown) is prepared to prevent the coil 7 from falling off. As shown in Fig. 5, the lower coil 8 connected to the coil 7 is inserted into the pad (Fig. (not shown). When this operation is repeated several times while moving in the circumferential direction, the coil 7 in the space can be easily moved to the inside of the stator inner surface 4 since it is not bound in any way. The frying coil 7' in Fig. 4,
8' is that. The fried lower coil 8' must be in close contact with the upper coil 6' located above the slot. The coils 6' and 8' protruding from the slot 5 are fixed by placing a coil stopper 14 having a felt-like soft pad 13 on the top of the round bar 12 on the spacing piece 15 of the core holder, as shown in FIG. To support. Next, the second divided stator 2 is hoisted horizontally by a crane (not shown), and the first
It is joined to the split stator 1 of. FIG. 7 shows the state immediately before joining. Dividing surface 3 of both split stators 1 and 2
When the distance between the two is approximately 500 mm, insert the guide rod 17 into the hole 18 for the tightening bolt to form a steady rest. Further, a guide plate 10 made of cardboard is inserted between the lifting coil 7' extending over the dividing surface 3 and the stator inner surface 4 to protect the lifting coil 7'. Next, while keeping the divided surfaces 3, 3 parallel, the second divided stator 2 is gradually brought closer to the first divided stator 1 and joined. At this time, since the lifting coil 7' is protected by the guide plate 10, it can be easily joined without any resistance. When the joining is completed, the guide rod 17 is removed and complete integration is performed using a tightening bolt (not shown). Next, the coil stopper 14 is removed, and the guide plate 10 is also removed. FIG. 8 shows a state in which the stator has been completely integrated, the guide plate 10 has been inserted, and the lifting coil 7' is shown in close proximity to the opening of the slot 5. That is, fried coil 7'
is located almost directly above slot 5, so guide plate 10
It can be easily inserted into the target slot 5 by removing it and giving it a slight vibration. After completing the work of installing the raised coil 7' across the dividing surface 3, the wires are connected and the coil is fixed.

Next, the operation of this embodiment will be explained.

In this way, although the frying coil is formed, it is different from the conventional frying coil 1 as shown in Fig. 2b.
Since the other lower coil is not inserted by passing under 1', the lifting height of the lifting coil 7' can be determined by simply inserting the guide plate 10 between the stator inner surface 4 and the lifting coil 7'. Since the height is extremely small, the assembly is highly reliable without damaging the insulation, and can be assembled extremely easily and at an extremely low cost since no special equipment is used.

Next, regarding other embodiments, FIGS. 9 and 10
This will be explained with reference to the figures. This is the case with a two-part stator of a horizontal shaft type rotating electric machine. First, the second divided stator 2, which will become the lower half, is installed at a predetermined position, and the rotor 100 is lifted onto the inner circumferential side thereof using a crane. Next, the salient magnetic poles 101 of the rotor 100 are symmetrically set,
A predetermined number of pieces are taken out within the range of the frying coil 7'. Usually there are 5 to 6 on each side. You can also hang something that has been removed in advance.
Next, a guide plate 10 is inserted between the lifting coil 7' and the stator inner surface 4. Next, the first divided stator 1, which will become the upper half, is lifted by a crane, and the second divided stator 2
hang vertically from above. FIG. 9 shows the state at that time. Thereafter, the process of removing the protective guide plate 10, placing the lifting coil 7' in the slot 5, and assembling it is the same as in the embodiment shown in FIGS. 3 to 8. Finally, attach the salient magnetic pole 101 that was removed.

In this way, the horizontal rotating electrical machine can also be assembled easily and inexpensively with high reliability.

〔Effect of the invention〕

As explained above, according to the present invention, although the raised coils are installed, all the coils of the split stator are installed and the height is sufficient to insert the guide plate between the raised coils and the inner surface of the stator. Since the coil is a fried coil, when assembling, simply remove the guide plate and give the coil a slight vibration, and the coil will fit into the slot.There is no risk of insulation damage due to the fried coil, making it highly reliable, extremely simple and inexpensive. It is now possible to assemble a split stator.

[Brief explanation of drawings]

Fig. 1 is a common top view of a stator assembled and completed by the method of the present invention and the conventional example, Fig. 2a is a top view showing a state in which a split stator is assembled by the conventional method, and Fig. 2b is 3 is a cross-sectional view showing the condition of the fried coil, FIG. 3 is a top view of one half of a split stator of a rotating electrical machine, assembled by the method of one embodiment of the present invention and shown in the state before transportation, and FIG. 4 is the divided stator. FIG. 5 is an elevational view showing the state in which the stator is being coiled before it is connected, FIG. Fig. 7 is a plan view showing the split stator of this embodiment in a state immediately before joining, Fig. 8 is a sectional view showing the state of the fried coils, and Fig. 9 is a split stator with fried coils of another embodiment. FIG. 10 is an elevational view showing the coil in the slot. DESCRIPTION OF SYMBOLS 1...First split stator, 2...Second split stator, 3...Divided surface, 4...Stator inner surface, 5...
Slot, 6...Coil, 7'...Fried coil,
10...Information board.

Claims (1)

[Claims] 1. In a method for assembling a divided stator for a rotating electric machine, in which a stator can be divided into a plurality of parts in the circumferential direction, and a two-layer coil is installed in the slot of the stator, the coil spanning the dividing plane of the stator is Attach all the coils, including the coils, to each divided stator, and when assembling the stator, strike the designated lower coil from below and move it upward together with the upper coil, so that the upper coil that spans the divided surface is attached to the inner surface of the stator. A small amount of coiling is carried out to the extent that a guiding plate can be inserted into the slot, and the divided surfaces are joined at the installation site using the guiding plate as a guide.Then, the guiding plate is removed and the coil that has been moved upward is assembled into the slot. A method for assembling a split stator for a rotating electric machine, characterized by: