JPS58165645A - Preparation of insulated coil - Google Patents

Abstract

PURPOSE:To facilitate assembly and to improve reliability by a method wherein a coil conductor is assembled with a semi-hardened outer slot insulating substance and a hardened inner slot insulating substance being contained therein and then the outer slot insulating substance is heat-hardened. CONSTITUTION:An insulating spacer is laid on the bottom of a slot 2. Subsequently a semi-hardened U-shaped outer insulating substance 9 and a heat-hardened inner slot insulating substance 10 are contained in the slot 2. A coil conductor 4 with a plurality of turns is contained in the slot while an insulating substance 11 is placed between the turns. The top of the coil conductor 4 is tightened with a wedge 7 through a spacer 6 under the wedge. Then the outer slot insulating substance 9 is heat-hardened by heating the whole body.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for manufacturing an insulated wire ring having a slot insulator in which the electrical insulation is strong and has a high mechanical strength.

(Dragon #4 OVt technical background and points of interest) - Transformer, 41
The laminated insulating sheet used for insulating the rotor field coil O-slot of a turbine generator is required to have sufficient electrical insulation properties and to withstand mechanical loads. Recently, laminated hardwood sheet materials using glass filaments and glass cloth have been introduced, and these have excellent electrical insulation properties and high horizontal strength, making them particularly suitable as slot insulation for KIJJi trochanter field wire rings. There is.

There are the following two methods for using this laminated y# insulation sheet as slot insulation.

One of them is IIK shown in 1st WA, which has a shape that matches the side wall of the U-shaped slot (2) of the iron core (1), and is made of a laminated insulating sheet that is made by impregnating a lath sheet with a thermosetting resin and curing it by heating. This is a method in which the slot insulator (3) is manufactured and placed in the slot (2) when assembling the single ring conductor (4). In this case, there is an insulating spacer (5) at the bottom of the slot.
There is a wedge under the conductor (4), and in order to support the centrifugal force of this insulating ring, it is suppressed from the side (7) K.

However, in this case, since the slot binding material (3) has been heat-hardened in advance, if a void is created due to unavoidable force during assembly or the difference in dimension between the slot (2J@- and O),
There were creases caused by the force applied when the wire conductor was housed, resulting in a decrease in dielectric strength, which required extreme care when molding the slot insulation and the Jomon process.

On the other hand, there is another method: irises! As fiK shows,
In order to eliminate the above-mentioned 011m and dimensional difficulty in molding, a glass sheet is impregnated with a thermosetting resin and then semi-hardened to form a laminate that is soft when placed in the slot (2) and easily conforms to the side wall of the slot (2). There is a method of using a slot insulator (gradient) made of an insulating sheet. In this case, the slot insulator (a) is folded over the ring conductor (4) from both sides, and after being pressed with I! (7), It is heated and cured.

However, in this case, when the KFI - ring conductor (4) is put in, the slot insulator (8) is soft, so when the - ring conductor (4) is put in, the - ring conductor (a part of the ring is particularly strong in the slot). The insulator (insulating object) may be compressed to produce a pre-concentration type, and the thickness of the O insulator may be reduced in only a portion of the pre-concentration type, which may result in destruction during the hour Ka withstand voltage test. In this case, the electrical properties of the slot insulator (8) would be reduced, which would result in a reduction in the properties of the insulating wire.

[Purpose of @9] Manufacture a reliable VAI & high insulation ring having a slot connection which has high mechanical strength and is easy to work during installation while maintaining the electrical supply characteristics The purpose is to provide a method.

[Summary of the invention]

In this method of manufacturing an insulated wire ring to be inserted into a U-shaped slot of an iron core, first, a semi-cured U-shaped outer slot insulator made by impregnating a glass sheet with a thermosetting resin is placed in the slot. , In the inside of the slot, 11 of them are divided at the bottom of the slot and filled with a glass sheet in a shape that matches the side wall shape of the slot.
By enclosing the KIi ring conductor and then heat-curing the outer slot insulation, a reliable insulation with slot connections that is easy to assemble and has high mechanical strength while maintaining electrical insulation integrity is created. Manufactures wire wheels.

[Embodiment of Ij110] Hereinafter, regarding an embodiment of the present invention, i1! with reference to irises 31m. Beak. In Iris 3-, (1) is the iron core, (8)
is u*m slot. Slot (2) jE K
a. Lay out the insulating spacer (5). Next, an outer slot insulator (9) consisting of a U-shaped O laminated insulation sheet semi-cured by impregnating a thermosetting resin into a glass sheet is placed on the insulation spacer (5) in the slot (2). . Inside the slot (2), there is an inner slot tie made of a laminated insulating sheet which is divided at the bottom of the slot (2) and has a shape that matches the side wall shape of the slot (2) in advance and is made by impregnating a thermosetting resin with a laminated insulating sheet and curing it by heating. I hold my breath. A plurality of turns of the wire conductor (4) are housed in the inner cylinder with a turn connection (IIJ) interposed between each turn.

- Hold the top of the ring conductor (4) horizontally (7) through the wedge spacer (6). By then heating the metal body,
Heat cure the outer slot insulation (9).

Next, the effect will be explained.

First, a semi-hardened outer slot insulator (9) is inserted, but since this outer slot insulator (9) is somewhat soft, it does not conform to the shape of the side wall of the slot (2). Furthermore, it can be assembled without causing any cracks during assembly. Next, when assembling the heat-hardened inner slot insulator a, the dimensions of the inner slot insulator after heat forming will be the same as the soft outer slot insulator, even if there is a slight dimensional error from the shape of the thrower). thing(
9) acts as a cushioning material, so that local concentrated stress does not occur, and ** occurs and K<. Furthermore, even if the hardened inner slot insulation should become scratched,
Since there is a crack-free outer slot insulator on the outside, there are no problems with electrical isolation and characteristics. On the other hand, the outer slot feeder (9) differs from the conventional one in that when it is in a soft semi-hardened state, it is not subjected to concentrated load directly by the wire ring conductor (4), and has a shape close to that of the hollow slot (2). Since the heat-cured inner slot insulation is between the single ring conductor (4), the load received from the single ring conductor (4) is evenly distributed. For this reason, the thickness of only one part becomes extremely thin, the bonding withstand voltage decreases, and the intermediate layer also disappears. Moreover, since there is a heat-hardened inner slot insulator inside the partial thickness 8 change to a certain extent, the overall O dielectric strength does not deteriorate to the extent that it becomes a problem. Furthermore, when the outer slot insulator (9) was heated and cured after assembly, the semi-cured material 11 was impregnated! ! Both slots A8 and fil are bonded together by I&curable resin, and O becomes O as well. As a result of the above, the slot insulator is hardened into a shape suitable for insulation, and an insulated coil with high reliability can be obtained.

Although the present invention is not limited to the embodiment described above and shown on page 11i1, it is not limited to O, but for example, slot (2).
Of course, it is possible to carry out various modifications as long as the purpose is not changed, such as not having to use the insulating spacer (5) or the wedge spacer (6).

(Effect of loose beak) As explained above, according to the present invention, a semi-hardened outer slot insulator is placed on the outside, and an inner slot insulator heated and hardened in the shape of the slot side wall is placed inside the slot. After assembling the wire conductor therein, the semi-hardened O outer slot insulation is heated and hardened to form a semi-hardened O outer slot insulator, which is easy to assemble and has high mechanical strength while maintaining electrical insulation properties. The present invention provides a method for manufacturing a reliable insulated coil having a slot insulator.

[Brief explanation of drawings]

Figures 1 and 1m2 are cross-sectional views showing insulated wire rings manufactured using different conventional methods. 1I3 - A cross section showing an insulated wire ring in the process of being manufactured by an example of Takazuki Hiromoto's method. ! ... Iron core 2 - ... Slot 4 ... Wire conductor 6 ... Wedge spacer 7 ... $
9... Outer slot insulator IQ... Inner slot insulator ・ Agent Patent attorney Mr. Inoue Figure 1 Figure 2 Figure 3, Ri?

Claims (2)

[Claims] (1) In the method of manufacturing an insulating wire to be inserted into a U-shaped slot of an iron core, first, a glass sheet is impregnated with a thermosetting resin M to make the U! A #-shaped O outer slot insulator is placed in the opening slot, and the inside of the O is impregnated with an S-shaped glass sheet tC island hardening tree layer that is divided at the bottom of the slot and matches the slot o*ai shape in advance. Place the heat-hardened inner slot colored edge, place the wire conductor inside it, and attach the inner slot edge to the outside of the bale and casting.
41Ii'. (2) A method for manufacturing a patented candy line for chess (vi2), characterized in that the uppermost parts of the four wire rings are held bare through a yokocho spacer.