JP3807662B2 - Connection method of lead wire in electromechanical winding - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method of connecting a lead wire for performing output extraction or power supply to an electrical machine winding in an electrical machine that mainly rotates, such as a generator or an electric motor.
[0002]
[Prior art]
With regard to armature windings in generators such as AC generators and welding generators, and stator windings of motors (hereinafter referred to as “electric machine windings”), the seismic resistance of the electric machine windings, etc. In order to increase the mechanical strength and prevent insulation deterioration due to moisture absorption in the air etc. by ensuring insulation, the electrical machinery winding is impregnated with insulating resin (varnish) such as high-strength epoxy resin Conventionally, a treatment to be performed (hereinafter referred to as “varnish impregnation treatment”) has been generally performed.
[0003]
One of the varnish impregnation methods for electric machine windings is a high temperature drip impregnation method. This method uses a varnish dropping device to rotate an iron core and an assembly of an electric machine winding (an armature assembly, etc.) incorporated in the iron core around the horizontal axis of the iron core, In this method, varnish is dropped onto both coil ends and impregnated with the varnish. At this time, when the varnish penetrates into the lead wire of the electromechanical winding and hardens, the portion where the varnish has penetrated becomes very strong, and post-processing such as shaping and connection after varnish drying cannot be performed.
[0004]
Therefore, conventionally, before the varnish impregnation treatment, the lead wire and the lead wire of the electromechanical winding are connected, and the connected lead wire is used for the assembly of the electric machine winding when the varnish impregnation treatment is performed. Shaping work so as not to cause inconvenience due to rotation, binding work of the temporary fixing with a tie wire etc. to the coil end, and dismantling of the temporary fixing binding part of the lead wire after finishing the varnish impregnation treatment It was.
[0005]
[Problems to be solved by the invention]
However, the shaping of the lead wire, the temporary fixing work of the binding, and the disassembly work of the temporary fixing and binding part have to be relied on manually, and are very complicated operations.
Further, when the varnish impregnation treatment is performed, the lead wire passes through the high-temperature furnace when the electric machine winding assembly is heated and dried. Insulation coating may cause thermal degradation. In order to prevent the thermal deterioration, a lead wire with a high heat resistance insulating coating must be used, which causes an increase in manufacturing cost.
[0006]
The present invention has been made to eliminate the above-mentioned problems, and at the same time eliminates the troublesome work required for temporarily fixing the lead wire before and after the impregnation with the insulating resin, and at the same time, insulating the lead wire. An object of the present invention is to provide a method for connecting lead wires in an electromechanical winding that contributes to preventing thermal degradation of the coating.
[0007]
[Means for Solving the Problems]
In order to solve the above-described problems, a method for connecting lead wires in an electromechanical winding according to the present invention includes the following steps.
(1) A lead wire derivation step in which the lead wire is derived from the electromechanical winding.
(2) A heat-meltable material-coated portion in which the lead wire is covered with a heat-meltable material at a position spaced from the tip end portion of the lead wire by a predetermined length toward the electric machine winding side, and the heat-fusible material An insulating material covering portion in which the leading end portion side of the lead wire is covered with an insulating material so as to overlap with a part of the end portion of the leading end portion side of the material covering portion; and the overlapping insulating material covering portion and the heat An insulating resin inflow prevention portion forming step of forming an insulating resin inflow prevention portion comprising: a heat shrinkable material covering portion that covers the meltable material covering portion with a heat shrinkable material.
(3) A heating step of heating the insulating resin inflow prevention portion at a predetermined temperature for a predetermined time.
(4) Insulating resin dropping impregnation step of dripping and impregnating the electric machine winding with insulating resin.
(5) A lead wire connecting step of connecting the leading end portion of the lead wire to the lead wire.
[0008]
Here, the predetermined length is a length necessary for connecting the lead wire, and is a length from the leading end portion of the lead wire determined in consideration of workability to the electromechanical winding side. . In addition, it is needless to say that the heat-meltable material and the heat-shrinkable material need to be appropriately selected from materials having such properties that each of the constituent materials performs heat-melting and heat-shrinking in the atmosphere of the heating process. Yes.
Furthermore, the insulating material covering portion may be provided so as to overlap with a part of the heat-meltable material covering portion and the heat-shrinkable material covering portion at the end portion on the tip end side of the insulating resin inflow prevention portion. However, when the insulating resin inflow prevention portion is overlaid on the entire area, the meltable material forming the heat-meltable material coating portion described later becomes the leader line by the shrinkable material forming the heat-shrinkable material coating portion. Since the effect of contraction and close contact is not achieved, the length of the overlapping portion needs to be appropriately determined so as to exhibit the effect.
[0009]
Therefore, according to the present invention, the insulating resin inflow prevention portion including the inner heat-meltable material covering portion and the outer heat-shrinkable material covering portion is formed (insulating resin inflow prevention portion forming step), and the insulation By heating the resin inflow prevention part (heating step), the heat-meltable material coating part in the insulating resin inflow prevention part is melted, and the heat-shrinkable material coating part on the outside contracts. Thus, the wire gap of the enameled copper wire of the lead wire is filled with the meltable material that forms the heat-meltable material coating portion, and the meltable material is filled with the shrinkable material that forms the heat-shrinkable material coating portion. The insulating resin that has contracted and adhered to the lead wire and the insulating resin permeating from the direction of the electric machine winding can be prevented from flowing in the direction of the tip of the electric machine winding by the insulating resin inflow prevention portion.
Therefore, the flexibility of the leading end side from the insulating resin inflow prevention portion in the lead wire can be maintained even after the step of impregnating the insulating resin, so that the lead wire can be easily connected to the lead wire. Electric machinery before and after the impregnation process is shaped, and the temporary fixing work of the bundling and the dismantling work of the temporary bundling part are not required, and it is not necessary to use a high-heat insulating insulating lead wire. The manufacturing cost can be reduced.
[0010]
Further, according to the present invention, the insulating material in which the leading end side of the lead wire is covered with the insulating material so as to overlap with a part of the end portion on the leading end side of the heat-meltable material covering portion and the heat-shrinkable material covering portion. Since it is configured to form the covering portion, the insulating resin does not flow in the insulating resin dropping impregnation step even in the portion of the lead line extending from the insulating resin inflow preventing portion to the tip portion side. The inflow of insulating resin can be reliably prevented.
[0011]
Further, in the insulating resin inflow prevention portion forming step, the heat-meltable material, the heat-shrinkable material, and the insulating material may be formed from flexible tube members.
[0012]
Therefore, according to the present invention, since the heat-meltable material, the heat-shrinkable material, and the insulating material are each formed from a flexible tube member, the insulating resin inflow prevention portion can be easily formed. It is possible to improve the workability and to ensure good quality after finishing since it has uniformity.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described in detail with reference to the drawings, taking the armature winding 10 in the generator as an example of an electromechanical winding. In the description of each embodiment, the same constituent elements are denoted by the same reference numerals, and redundant description is omitted.
[0014]
The lead wire connecting method in the electromechanical winding according to the present invention includes (1) a lead wire derivation step, (2) an insulating resin inflow prevention portion forming step, (3) a heating step, (4) an insulating resin dripping impregnation step, (5) It is comprised from the lead wire connection process.
[0015]
(1) Leader Wire Deriving Step This step is a step of performing an operation of forming the lead wire 20 in a state where the lead wire 20 is led out from the armature winding 10.
[0016]
As shown in FIG. 1, the armature winding 10 is wound around an armature core 12 constituting an armature 11 of a generator. The armature core 12 has an annular shape and has a slot ( A plurality of armature core pieces, which are thin iron plates with a plurality of holes (not shown), are stacked.
The armature winding 10 is formed by winding a bundle of strands of enameled copper wires such as polyester that are bundled in parallel, a plurality of which are housed in a predetermined slot and fixed by a wedge The armature core 12 is wound around. Further, the coil end 13 protruding from the slot is shaped to a predetermined dimension, and a plurality of lead wires 20 are led out from the terminal portion of the wound armature winding 10. In this step, a series of operations for forming the lead wire 20 from the armature winding 10 is performed.
[0017]
(2) Insulating resin inflow prevention portion forming step In this step, the varnish inflow prevention portion 30 is located at a position (approximately 200 mm in this embodiment) spaced from the tip end portion of the lead wire 20 toward the armature winding 10 side by a predetermined length. It is a process of forming (insulating resin inflow prevention part).
The varnish inflow prevention unit 30 includes a heat-meltable material coating portion 31 in which the lead wire 20 is coated with a heat-meltable material, and a heat-shrinkable material coating portion in which the heat-meltable material coating portion 31 is covered with a heat-shrinkable material. 32 and an insulating material covering portion 33.
[0018]
As an example of the hot-melt material, it is preferable to use a hot-melt uncrosslinked polyolefin resin as a main raw material (softening point of about 110 ° C.) and formed as a flexible tube member ( Hereinafter referred to as “hot-melt resin tube”).
As an example of the heat-shrinkable material, a soft polyolefin resin is used as a main raw material, and cross-linking is performed between molecules by electron beam irradiation (shrinkage condition, 125 ° C. ± 5 ° C.) and formed as a flexible tube member It is preferable to use the one obtained (hereinafter referred to as “heat-shrinkable tube”).
As an example of the insulating material, it is preferable to use a sleeve formed of a glass fiber braided and formed as a flexible tube member obtained by applying and drying a silicone polymer (hereinafter referred to as “insulating tube”). ).
[0019]
Using these constituent materials, the varnish inflow prevention portion 30 is formed by the following procedure.
As shown in FIG. 2, first, the lead wire 20 is covered with a heat-melting resin tube having a predetermined length at a position spaced from the tip end portion of the lead wire 20 toward the armature winding 10 by a predetermined length. A meltable material covering portion 31 is formed. Then, the remaining part of the lead wire 20 is covered with an insulating tube so as to be substantially overlapped with the end portion on the other end side of the armature winding 10 side in the hot melt material covering portion 31. The insulating material covering portion 33 is formed. Further, the entire area of the heat-meltable material covering portion 31 is covered with a heat-shrinkable tube to form the heat-shrinkable material covering portion 32.
Thereby, the site | part of the predetermined length by the side of the armature winding 10 of the leader wire 20 in the varnish inflow prevention part 30 has the two-layer structure of the heat-meltable material coating | coated part 31 and the heat-shrinkable material coating | coated part 32. The part of the predetermined length on the other end side has a three-layer structure in which the insulating material covering portion 33 is overlapped between the heat melting material covering portion 31 and the heat shrinkable material covering portion 32. .
[0020]
As shown in FIG. 4, a copper crimp sleeve 21 is attached to the leading end of the lead wire 20 on which the varnish inflow prevention portion 30 is formed, and the varnish inflow prevention portion 30 and the varnish inflow prevention portion 30 The lead wire 20 on the child winding 10 side is shaped into a ring shape along the outer periphery of the coil end 13, and is fixed by binding an appropriate position using the binding material 15.
[0021]
In addition, as shown in the said FIG. 2, in a heat-meltable resin tube, you may put together the strand bundle (element bundle which bundled several strands in parallel) which comprises all the leader lines 20, As shown in FIG. 3, the lead wire may be divided into a plurality of pieces, and a predetermined number of strands 20 ′ may be covered with a hot-melt resin tube. As described above, the reason for using a plurality of heat-meltable resin tubes is that when the meltable material is melted in the heating process described later, when the strand 20 'of the lead wire 20 is large, one heat This is because the gap formed in the strand 20 'of the lead wire 20 cannot be completely filled with the meltable material only with the meltable resin tube.
[0022]
(3) Heating step This step is a step of heating the varnish inflow prevention unit 30 at a predetermined temperature for a predetermined time.
This step heats the armature 11 in order to impart fluidity to the varnish to facilitate impregnation of the varnish in the armature winding 10 and to remove moisture in the insulating resin dropping impregnation step, which is the next step. The armature 11 is placed in a drying furnace (not shown) at a predetermined temperature for a predetermined time (in this embodiment, approximately 135 hours at 135 degrees). .
By this step, the inner heat-meltable material coating portion 31 in the varnish inflow prevention portion 30 is melted, and the outer heat-shrinkable material coating portion 32 is shrunk, so that the wire gap of the lead wire 20 is melted. It is possible to form the varnish inflow preventing portion 30 that can reliably prevent the inflow of the varnish by filling the melted material with the shrinkable material and shrinking and adhering the meltable material to the lead wire 20 with the shrinkable material.
[0023]
(4) Insulating resin dripping and impregnating step This step is a step of dripping and impregnating the varnish into the armature winding 10 and impregnating the varnish with the wire gap of the armature winding 10 or the armature winding 10. And the armature core 12 are impregnated into the gap.
In this step, as shown in FIG. 5, the armature 11 is placed on the rotating device 40, and the varnish supply pipe is disposed above the coil ends 13 at both ends of the armature core 12 so as to face the coil ends 13. A dripping nozzle 43 connected to a varnish supply device (not shown) through 42 is provided. While the armature 11 is heated in advance, the armature 11 is rotated by the rotating body 41 while the coil end 13 is rotated. The operation of dropping varnish from the dropping nozzle 42 for a predetermined time (hereinafter referred to as “varnish dropping process”) is performed.
[0024]
As a result, the varnish penetrates and fills between the strands of the armature winding 10 and between the armature winding 10 and the slot and the like, so that the armature winding 10 is firmly connected. It is possible to prevent a decrease in insulation due to moisture absorption in the air or the like by increasing the mechanical strength such as, and ensuring the insulation.
[0025]
Here, since the varnish inflow prevention part 30 is bound and fixed to the coil end 13 before performing the varnish dripping treatment, the varnish is sufficiently spread by being immersed in the varnish dripping at the time of the varnish dripping treatment. After the treatment, it is firmly fixed to the coil end 13 with a varnish. On the other hand, the inflow due to the penetration of the varnish from the armature winding 10 side into the strand of enameled copper wire constituting the lead wire 20 inside the varnish inflow prevention unit 30 is blocked by the varnish inflow prevention unit 30. .
On the other hand, during the varnish dripping treatment, the varnish is transmitted from the surface layer portion of the coil end 13 to the surface portion of the insulating material covering portion 33 in the vicinity of the distal end side of the varnish inflow preventing portion 30. However, since the insulating material covering portion 33 is formed of a resin mainly made of a silicon-based polymer and has a property of repelling varnish, the varnish may penetrate into the insulating material covering portion 33. , It does not adhere (for example, it does not adhere even if it adheres). Accordingly, the varnish does not flow from the varnish inflow prevention portion 30 to the inside of the insulating material covering portion 33 on the distal end side, so that the flexibility of the portion is not impaired and the following lead wire connection process is hindered. Can be done without.
[0026]
(5) Lead wire connecting step This step is a step of connecting the crimp sleeve 21 at the leading end of the lead wire 20 to a lead wire (not shown) for load connection.
In this step, after the varnish is cured, the armature 11 is press-fitted into a generator frame (not shown), and the lead wire 20 is connected to the lead wire via the crimp sleeve 21.
The lead wire 20 to which the lead wire is connected is overlapped with the varnish inflow prevention portion 30 that is bound and fixed to the coil end 13 at the end of the insulating resin inflow prevention portion forming step after the insulation treatment. Thus, the coil end 13 is shaped along the outer periphery, and appropriate portions are fixed by binding using a binding material.
[0027]
Thus, according to the connection method of the lead wire in the electromechanical winding of the present invention, the varnish inflow prevention portion 30 is formed in the insulating resin inflow prevention portion forming step, and the varnish inflow prevention portion 30 is formed in the heating step. By heating, the inner heat-meltable material coating portion 31 in the varnish inflow prevention portion 30 is melted, and the outer heat-shrinkable material coating portion 32 is contracted. As a result, the wire gap of the lead wire 20 is filled with a meltable material, and the meltable material shrinks and adheres to the shrinkable material. The varnish that has entered from the direction of the armature winding 10 can be prevented from flowing in the direction of the tip of the armature winding 10.
Therefore, since the flexibility of the leading end side from the varnish inflow preventing portion 30 in the lead wire 20 can be maintained, the lead wire 20 and the lead wire can be connected after the insulating resin dropping impregnation step. This eliminates the need for lead wire shaping, bundling temporary fixing work and temporary fixing bundling work previously performed before and after the insulating resin impregnation treatment, and also provides a high heat-resistant insulating coating. Therefore, it is possible to reduce the manufacturing cost.
[0028]
Further, the insulating material covering portion 33 is formed by overlapping the tip portion side of the lead wire 20 with an insulating material so as to overlap with a part of the end portion on the leading end side of the heat melting material covering portion 31 and the heat shrinkable material covering portion 32. Therefore, the inflow of the varnish can be surely prevented even in the lead line extending from the varnish inflow prevention portion 30 to the tip end side.
[0029]
Heretofore, an example of a preferred embodiment has been described for the present invention. However, the present invention is not limited to the above-described embodiment, and the design of each of the above-described components can be appropriately changed without departing from the spirit of the present invention.
In particular, the electromechanical winding is not limited to the armature winding in the generator, and can be used for a stator winding of the motor.
Further, the heat-meltable material, the heat-shrinkable material, and the insulating material are not limited to the materials described in the embodiment.
[0030]
【The invention's effect】
According to the present invention, an electric machine that contributes to eliminating the troublesome work required for temporary fixing of the lead wire before and after the impregnation with the insulating resin, and at the same time, preventing thermal deterioration of the insulation coating of the lead wire. It is possible to provide a method for connecting lead wires in a winding.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an armature.
FIG. 2 is a cross-sectional view of the lead wire of the armature winding in the insulating resin inflow prevention portion forming step of the present invention.
FIG. 3 is a cross-sectional view of another embodiment of the lead wire of the armature winding in the insulating resin inflow prevention portion forming step of the present invention.
FIG. 4 is an enlarged view showing an armature in the insulating resin inflow prevention portion forming step of the present invention.
FIG. 5 is a perspective view of an armature in an insulating resin dropping impregnation step of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Armature winding 11 Armature 12 Armature core 13 Coil end 15 Bundling material 20 Lead wire 20 'Strand bundle 21 Crimp sleeve 30 Varnish inflow prevention part (insulation resin inflow prevention part)
31 Heat-meltable material coating portion 32 Heat-shrinkable material coating portion 33 Insulating material coating portion 40 Rotating device 41 Rotating body 42 Varnish supply pipe 43 Drip nozzle

Claims (2)

A method for connecting lead wires in an electromechanical winding comprising the following steps.
(1) A lead wire derivation step in which the lead wire is derived from the electromechanical winding.
(2) At a position spaced a predetermined length from the tip of the lead wire to the electromechanical winding side,
A heat-meltable material-coated portion in which the lead wire is covered with a heat-meltable material;
An insulating material covering portion that is overlapped with a part of the end portion on the tip end portion side of the heat-meltable material covering portion, and covering the tip end side of the lead wire with an insulating material;
A heat-shrinkable material covering portion obtained by covering the superposed insulating material covering portion and the heat-meltable material covering portion with a heat-shrinkable material;
An insulating resin inflow prevention portion forming step of forming an insulating resin inflow prevention portion.
(3) A heating step of heating the insulating resin inflow prevention portion at a predetermined temperature for a predetermined time.
(4) Insulating resin dropping impregnation step of dripping and impregnating the electric machine winding with insulating resin.
(5) A lead wire connecting step of connecting the leading end portion of the lead wire to the lead wire. In the insulating resin inflow prevention part forming step,
The lead wire in the electric machine winding according to claim 1, wherein the heat-meltable material, the heat-shrinkable material, and the insulating material are each formed from a flexible tube member. Connection method.

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