JPH05115143A - Reinforcing and insulating structure for lead-out section of hexagonal coil - Google Patents

Abstract

PURPOSE:To increase the insulating performance of an coil end by placing elastic insulator in a wedge-shaped space formed between a hexagonally and neatly wound coil end insulating section and a coil lead-out insulating layer and by reinforcedly insulating a specified length of the coil end section and coil lead wire together. CONSTITUTION:A coil end section which is formed by neatly winding a coil conductor 1 several times into a hexagonal shape is coated with a coil head insulating layer 2 to be insulated. A lead wire 3E of an element wire conductor 3 is coated with a lead-out insulating layer 4 to be insulated. A wedge-shaped space formed between the lead-out insulating layer 4 and the coil head insulating layer 2 is filled with elastic insulator. Then, a coil end main insulating layer 5 is wound round the coil head insulating layer 2 and the lead-out insulating layer 4 covering a specified length, with an exposed section 17 remained unwound, to form a reinforcing insulating layer 16. By this method, the insulating performance of the coil end is increased and thereby the insertion of a coil into a slot can be done efficiently.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reinforcing insulation structure for a lead wire lead portion (lead portion) in a hexagonal coil used as a stator winding of an induction motor or the like.

[0002]

2. Description of the Related Art FIG. 2 is a perspective sectional view showing a conventional reinforced insulating structure of a tortoiseshell-shaped coil opening portion. The conductor 1 is covered with a coil head insulating layer 2 in which the coil end head portion 1H of the coil end, which is curved in a U shape, is taped with a mycatep, an assembled mycatepe or the like. Also,
Both ends of the wire conductor 3 are coiled conductors 1 as lead wires 3E.
, And a predetermined area is covered with the lead-out insulating layer 4 in the same manner as the coil head insulating layer. Further, a wedge-shaped gap formed between the lead-out insulating layer 4 and the coil head insulating layer 2 is filled with, for example, a sheet-shaped insulating material piece or a fleece-shaped insulating material as a reinforcing insulating layer 6. After that, the coil end portions are bound by the coil end main insulating layer 5 which is taped with a my catap, an assembled my catap, and the like.
In addition, in order not to expose the reinforcing insulating layer 6 to the outside of the coil end main insulating layer 5, the tip portion 5E of the coil end main insulating layer 5 is formed.
Is configured to be wound longer than the end of the reinforcing insulating layer 6 by a slight dimension d. The hexagonal coil in which the respective insulating layers are formed in this way is a coil insertion work in which a straight portion of the coil (not shown) is inserted into a slot formed in a stator core (not shown) After conducting the connecting work to electrically connect the two to each other, the insulating coating work to the conductive connecting part, etc., the whole is impregnated with resin and heat-cured, so that the desired withstand voltage performance and mechanical stability of each insulating layer, and Heat resistance and moisture resistance are added.

[0003]

The lead wire 3 is attached to the hexagonal coil at the time of coil insertion work before resin impregnation treatment, connection work, or insulation coating work of the conductive connection portion.
Various bending loads and torsion loads are applied to E. Therefore, the above load spreads to the unimpregnated reinforcing insulating layer 6 interposed in the wedge-shaped gap located at the root of the lead wire 3E, and the reinforcing insulating layer is crushed and deformed, or the insertion position is changed. The gap again occurs in the wedge-shaped gap filled with the reinforcing insulating layer. When a gap is generated in this way, the impregnated resin flows out through the gap in the heating and curing process to the outside, so that the reinforcing insulating layer 6 that has been cured and the insulating layers 2 that are in contact with the reinforcing insulating layer 6 are cured. , 4, 5
A gap that communicates with the outside air remains between the coil and the outside, and the seal performance of the reinforcing insulating layer 6 deteriorates, and after being incorporated into the electric motor, moisture, dust containing an electrolyte such as salt, etc. inside the coil. The insulation resistance of the coil insulation deteriorates and the leakage current at the outlet increases, which accelerates deterioration of the insulation, and this part becomes a weak point that the withstand voltage performance of the coil deteriorates. Develop into a situation.

An object of the present invention is to obtain a reinforced insulation structure of a lead-out portion which does not cause a gap in a non-impregnated reinforced insulation layer at the time of coil insertion work and can obtain excellent moisture resistance performance by resin impregnation. is there.

[0005]

In order to solve the above-mentioned problems, according to the present invention, a coil head insulating layer for covering a coil end head of a coil conductor formed by winding a wire conductor in a hexagonal shape, and A lead insulation layer covering a terminal portion of a wire conductor, and a lead end portion made of a coil end main insulating layer that covers the coil head insulation layer and the lead insulation layer in common over a predetermined range. An end portion of the coil end main insulating layer made of an elastic insulating material filled in a wedge-shaped gap interposed between the coil head insulating layer covered with the coil end main insulating layer and the lead-out insulating layer A reinforcing insulating layer having an exposed portion of several mm or more is provided on the outer side of.

Further, the elastic insulating material is made of polyester fleece material, and is impregnated with resin and cured together with the coil head insulating layer, the lead-out insulating layer and the coil end main insulating layer.

Further, it is assumed that the insulating material having elasticity is made of a prepreg material obtained by impregnating a polyester fleece material with a resin in advance and semi-curing the same, and is cured with the impregnating resin of each insulating layer.

[0008]

In the structure of the present invention, the hexagonal coil lead-out portion is elastically filled in the wedge-shaped gap interposed between the coil head insulating layer covered with the coil end main insulating layer and the lead-out insulating layer. The insulating material having elasticity has a structure in which a reinforcing insulating layer having an exposed portion of several mm or more is provided outside the tip of the coil end main insulating layer. The unimpregnated reinforced insulating layer that shrinks due to the binding force of the pad and fills the wedge-shaped gap is formed, and the exposed part, which is less affected by the binding force, retains elasticity and closes the entrance of the wedge-shaped gap. Even if the lead wire is deformed during coil insertion work or connection work of the shaped coil, the exposed part retains elasticity and communicates with the inside of the coil through the wedge-shaped gap filled with the unimpregnated reinforcing insulating layer. The gap is again Function to prevent that to live is obtained.

If the elastic insulating material is made of polyester fleece material and is impregnated with resin and cured together with the coil head insulating layer, the lead-out insulating layer, and the coil end main insulating layer, Utilizing the resin impregnating ability of the polyester fleece material filled in the wedge-shaped gap without any gap and the retainability of the impregnating resin of the exposed part that closes the inlet of the gap, a sufficient amount of impregnated resin is maintained and heating is performed. Since the function of preventing the impregnated resin from leaking out at the time of curing is obtained, a reinforced insulating layer having excellent seal performance and moisture resistance at the time of curing the impregnated resin can be obtained.

Further, the elastic insulating material is made of a prepreg material which is semi-cured by impregnating a polyester fleece material with a resin in advance, and is hardened by being hardened together with the impregnated resin of each insulating layer. Before processing, the property of the prepreg material, which is flexible and has rubber elasticity, can be utilized to prevent the recurrence of the gap during work, and during the curing process, the prepreg material hardens first and the surrounding area is delayed. Since the cured impregnated resin is intimately adhered to and surrounded to prevent voids from being generated between the cured impregnated resin and each insulating layer, a reinforced insulating layer having more excellent seal performance and moisture resistance can be obtained.

[0011]

EXAMPLES The present invention will be described below based on examples. FIG. 1 is a perspective cross-sectional view showing a reinforcing insulation structure of a tortoiseshell-shaped coil lead-out portion according to an embodiment of the present invention, and the same components as those of the prior art are designated by the same reference numerals, and a duplicate description will be omitted. .. In the figure, the reinforcing insulating layer 16 is made of an insulating material having elasticity such as polyester fleece material, and is filled in a wedge-shaped gap interposed between the coil head insulating layer 2 and the lead-out insulating layer 4. The coil end and the lead wire are bound by the coil end main insulating layer 5, and the binding force generated at that time compresses the polyester fleece to form a lead portion having the reinforcing insulating layer 6 filling the gap. In particular, the tip 5E of the coil end main insulating layer 5 is
It is at a position shorter than the end of the reinforced insulating layer 16 by several mm or more,
Reinforcement insulating layer 1 having exposed portion 17 outside reinforcement insulating layer 5
6 is formed.

In the hexagonal-shaped coil lead-out portion thus formed, the polyester fleece in the portion tightly bound by the coil end main insulating layer 5 may bend the lead-out wire 3E during the coil slotting work or the connecting work. The twisted part causes some deformation and displacement, but the exposed part 16 that is not bound by the coil end main insulating layer retains elasticity and expands and contracts following the deformation of the lead wire to form a wedge shape. It always closes the entrance of the gap and prevents the formation of a gap communicating with the outside air in the wedge-shaped gap. In addition, when the resin is impregnated, a sufficient amount of resin is impregnated into the coil through a polyester fleece material having resin permeability, and at the time of heat curing thereof, the resin of the exposed portion 17 that closes the inlet of the wedge-shaped gap. Since the impregnating resin can be prevented from leaking to the outside by utilizing the holding property, when the impregnating resin is cured, the reinforcing insulating layer 16 having excellent seal performance and moisture resistance is formed, and moisture and dust can enter. It is possible to obtain a reinforced insulation structure of the tortoiseshell-shaped coil outlet that is capable of maintaining high withstand voltage performance.

If the polyester fleece material is impregnated with an epoxy resin or the like in advance and the reinforced prepreg material is formed by using a semi-cured prepreg material, it is soft and rubbery before the curing treatment. Using the properties of the prepreg material, the function to prevent the occurrence of gaps during work is obtained, and the prepreg material is first cured during the curing process, and the impregnated resin that has been cured with a delay is closely adhered to and surrounded. As a result, a gap is prevented from being formed between each of the insulating layers, so that it is possible to obtain a reinforced insulating layer having more excellent seal performance and moisture resistance performance.

[0014]

As described above, the present invention has an elastic insulating material filled in a wedge-shaped gap interposed between the coil head insulating layer covered with the coil end main insulating layer and the lead-out insulating layer. In addition, the reinforcing insulation layer having an exposed portion of several mm or more outside the end portion of the coil end main insulation layer is provided in the hexagonal coil lead-out portion. As a result, the exposed part that is not bound by the coil end main insulating layer retains elasticity, expands and contracts following the deformation of the lead wire, constantly closing the entrance of the wedge-shaped gap, and the outside air inside the wedge-shaped gap. Since a communication gap is prevented from being generated again, a reinforcing insulating layer is used in the coil insertion work, the connection work, or the insulating coating work of the conductive connection, which has been a problem in the conventional reinforcing insulation structure having no exposed portion. It is possible to avoid the situation in which the resin is crushed and deformed, or the insertion position is shifted, and a gap is created again in the wedge-shaped gap filled with the reinforcing insulating layer, and the impregnated resin flows out through this gap. Benefits are obtained.

Further, if the elastic insulating material is made of polyester fleece material, and the coil head insulating layer, the lead-out insulating layer, and the coil end main insulating layer are impregnated with resin and cured, the wedge is formed. Using the resin impregnating ability of the polyester fleece material that is filled into the gaps without gaps and the retention of the impregnated resin by the exposed portion that closes the entrance of the gaps, leakage of the resin during heat curing is prevented, At the time of curing of the impregnated resin, a reinforcing insulating layer having excellent seal performance and moisture resistance can be obtained, so that moisture or dust containing electrolyte such as salt enters the inside of the coil through the gap between the reinforcing insulating layers. The moisture resistance of the coil insulation is reduced,
This increases the leakage current at the outlet, which accelerates the deterioration of insulation and eliminates the problem of the conventional technology that this portion becomes a weak point and lowers the withstand voltage performance of the coil. It is possible to provide a hexagonal coil having a high-strength reinforced insulating structure.

Further, if the elastic insulating material is made of a prepreg material obtained by impregnating a polyester fleece material with a resin in advance and semi-curing the resin, it is cured with the impregnating resin of each insulating layer. Before this, the properties of the prepreg material, which is flexible and has rubber elasticity, can be used to prevent the occurrence of gaps during work, and the prepreg material is cured first during the curing process, and the impregnated resin that has been cured around the periphery of the prepreg material is delayed. Since it closely adheres to and surrounds each other to close the gap between the insulating layers, a reinforced insulating layer having superior sealing performance and moisture resistance is formed, and the turtle shell has a reinforced insulating structure at the outlet that has more excellent insulation reliability. Shaped coils can be provided.

[Brief description of drawings]

FIG. 1 is a perspective cross-sectional view showing a main part of a hexagonal coil provided with a reinforcing insulating structure of a mouth according to an embodiment of the present invention.

FIG. 2 is a perspective cross-sectional view showing a conventional reinforced insulating structure of the hexagonal coil outlet

[Explanation of symbols]

 1 Coil Conductor 1H Coil End Head 2 Coil Head Insulation Layer 3 Elemental Wire Conductor 3E Output Wire 4 Output Output Insulation Layer 5 Coil End Main Insulation Layer 6 Reinforcement Insulation Layer 16 Reinforcement Insulation Layer 17 Exposed Part

Claims (3)

[Claims] 1. A coil head insulating layer covering a coil end head of a coil conductor obtained by aligning and winding a wire conductor in a hexagonal shape, a lead insulating layer covering a terminal portion of the wire conductor, and the coil head insulation. Layer and lead-out insulating layer having a lead-out portion consisting of a coil-end main insulating layer which covers the lead-out insulating layer in common over a predetermined range, wherein the coil-end main insulating layer and the lead-out insulating layer are covered with the coil-end main insulating layer. A few mm outside the tip of the coil end main insulating layer, made of an elastic insulating material filled in a wedge-shaped gap interposed between
A reinforced insulating structure for a hexagonal coil lead-out portion comprising the reinforced insulating layer having the above exposed portion. 2. The elastic insulating material is made of polyester fleece material, and is impregnated with resin and cured together with a coil head insulating layer, a lead insulating layer, and a coil end main insulating layer. The reinforced insulating structure of the tortoiseshell coil outlet according to claim 1. 3. An elastic insulating material is made of a prepreg material obtained by impregnating a polyester fleece material with a resin in advance and semi-curing the resin, and is hardened together with the impregnating resin of each insulating layer. The reinforced insulating structure of the tortoiseshell coil outlet according to claim 1.