JPS60167642A - Fixing device of stator coil - Google Patents

Abstract

PURPOSE:To secure a stator coil by a side liner by increasing the width of a bottom coil larger than the width of the coil and inserting fixedly the liner. CONSTITUTION:A 2-layer hexagonal stator coil 1a of an upper coil 1b and a bottom coil 1c contained in a slot 3 of a laminated core 2 is secured by a side liner 4 inserted to between the side of the coil 1a and the side wall of the slot 3 by increasing the width of the coil 1c larger than the width of the coil 1b, and the side liner 4 is inserted and secured. Thus, the coil 1a of the upper and lower layers contained in the slot 3 of the laminated core 2 can be secured by the liner 4.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a fixing device for a stator coil, and particularly to a fixing device for a hexagonal stator coil.

[Background of the invention]

In rotating electric machines such as water turbine generators and synchronous motors, the stator current increases as the capacity of the equipment increases, and the electromagnetic force of the conductor of the stator coil increases accordingly. This electromagnetic force has a frequency twice the rated frequency, and gives a oscillating tension that presses the stator coil against the bottom or side of the groove, causing impact and abrasion deterioration of the insulation layer of the stator coil. So,
Fixing the stator coil within the groove to protect the stator coil from such vibrations has become a major problem.

The stator coils are generally fixed by wedges or by filling between the side walls of the grooves and the side surfaces of the stator coils. Of course, the fixation of the stator coil is achieved by the combination of these two factors, and even if the stator coil is firmly fixed by the wedge, if there is a gap between the side wall of the groove and the side surface of the stator coil, the stator coil may become loose. moves, and eventually the stator coil begins to suffer dielectric breakdown due to frictional wear with the laminated iron core (hereinafter referred to as the iron core).

Furthermore, if there is a gap between the wedge and the stator coil, even if the side wall of the groove and the side surface of the stator coil are firmly fixed, the stator coil will vibrate within the free space restricted by the gap, causing the iron core to The insulation layer of the stator coil becomes dielectrically broken due to the shock and friction caused by the stator coil. The vibration force in this case is several times stronger than the electromagnetic force mentioned above.

As described above, fixing the stator coil to the groove of the iron core is an important issue, but as the capacity of equipment increases, the fixing that fixes the side wall of the groove and the side of the stator coil is becoming a particular problem. It is a device. Conventionally, a side liner has been generally used for this fixing device, and a side liner such as a spring, thin plate, or tapered liner is inserted into the gap on one side between the side wall of the stator coil and the side wall of the groove. The stator coil is pressed against the side wall of the groove on the side where it cannot be inserted, and the stator coil is restrained and fixed by the frictional force between the side wall of the stator coil and the side wall of the groove that is in close contact with it.

However, this fixing device using a side liner is only effective for half coils in which the top coil can be inserted into the groove after the side liner is inserted into the bottom coil in the groove. In the case of a hexagonal stator coil as shown in Fig. 1, in order to put all the stator coils 1 into the grooves, when putting the last stator coil 1 into the groove, it is necessary to put it into the groove first. It is necessary to float a certain stator coil 1 toward the inner diameter side. Especially in recent years, with the stator coils 1 that have excellent insulation, it is not only difficult to move the stator coils 1 because the stator coils 1 are hard, but also the number of stator coils 1 that are kept floating has increased. ing. Therefore, even if one side liner is inserted between the side surface of the bottom coil of the floating portion and the side wall of the groove, it is not possible to insert the entire stator coil 1 into the groove. If the width of the upper coil is smaller than the width of the bottom coil, the side liner can be inserted after all stator coils 1 are placed in the groove, but fixing obtained by winding and forming an insulating layer on the conductor It is difficult to manufacture all of the child coils 1 to have the same dimensions, and there is a 50% probability that the width of the top coil will be larger than the width of the bottom coil. Even if the side liner was inserted, it was difficult to reduce the gap between the side surface of the bottom coil and the side wall of the groove to zero.

[Purpose of the invention]

The present invention has been made in view of the above points.

It is an object of the present invention to provide a stator coil fixing device that makes it possible to fix two layers of upper and lower hexagonal stator coils housed in grooves of a laminated core with side liners.

[Summary of the invention]

That is, the present invention fixes two layers of hexagonal stator coils, an upper coil and a bottom coil, housed in a groove of a laminated core with a side liner inserted between the side surface of the stator coil and the side wall of the groove. The stator coil is characterized in that the width of the bottom coil is made larger than the width of the upper coil to insert and fix the side liner, whereby the stator coil is fixed by the side liner. will be done.

[Embodiments of the invention]

The present invention will be explained below based on the illustrated embodiments. The second @ shows an embodiment of the present invention. Note that parts that are the same as those in the conventional system are given the same reference numerals, and therefore their explanations will be omitted. In this embodiment, the upper coil 1 is housed in the groove 3 of the laminated core 2.
Two-layer tortoiseshell stator coil 1a with bottom coil 1c and bottom coil 1c
is fixed by the side liner 4 inserted between the side surface of the stator coil 1a and the side wall of the groove 3.
The side liner 4 is inserted and fixed by making the width of the coil c larger than the width of the upper coil 1b. By doing this, the stator coil 1a is fixed by the side liner 4, and the upper and lower hexagonal stator coils 1a housed in the grooves 3 of the laminated core 2 are fixed by the side liner 4. It is possible to obtain a fixing device for the stator coil 1a that makes it possible to do the following.

In other words, since the width of the bottom coil 1c is made larger than the width of the top coil 1b, the distance between the side surface of the bottom coil 1c and the side wall of the groove 3 is smaller than the distance between the side surface of the top coil 1b and the side wall of the groove 3, and therefore the entire Even after the stator coil 1a is inserted into the groove 3, the side liner 4 can be inserted, and the bottom coil 1c can be firmly fixed. and upper coil 1
If there is a gap between the upper coil lb and the side wall of the groove 3, the adjustment liner 5 can be inserted between the upper coil lb and the side wall of the groove 3, and the upper coil 1b can be firmly fixed.

Another embodiment of the invention is shown in FIG.

In this embodiment, as in the case of a half coil, the side liner 48 is divided into an upper coil 1b and a bottom coil IC, and the side liner 4b inserted between the upper coil 1b and the side wall of the groove 3 is used as the bottom coil. The side liner 4c was inserted between the side liner 1c and the side wall of the groove 3 in a larger size than the side liner 4c.

In this case as well, the same effects as in the above case can be achieved.

〔Effect of the invention〕

As described above, in the present invention, the hexagonal stator coils placed in the upper and lower layers in the grooves are fixed by the side liners, and the hexagonal stator coils in the upper and lower layers are fixed in the grooves of the laminated core. It is possible to obtain a stator coil fixing device that allows a child coil to be fixed with a side liner.

[Brief explanation of the drawing]

FIG. 1 is a front view of a hexagonal stator coil of a conventional stator coil fixing device, FIG. 2 is a cross-sectional view of an embodiment of the stator coil fixing device of the present invention, and FIG. 3 is a front view of a hexagonal stator coil of a conventional stator coil fixing device. FIG. 7 is a sectional view of another embodiment of the fixing device for the fixing coil. 1a...Stator coil, 1b...Upper coil, IC・
...Bottom coil, 2...Laminated core, 3...Groove, 4t4
ap4b.

Claims (1)

[Claims] 1. Two layers of hexagonal stator coils, the top coil and the bottom coil, housed in the grooves of the @ layer core, are fixed with side liners inserted between the sides of the stator coils and the side walls of the grooves. The stator coil fixing device is characterized in that the width of the bottom coil is made larger than the width of the top coil, and the side liner is inserted and fixed therein.