JPH0845766A - Manufacture of winding - Google Patents

Abstract

PURPOSE:To easily form a winding in a short time, by coaxially arranging a first and a second windings outside a temporary iron core, making a large current flow in the first and the second windings in a moment, and generating an electromagnetic repellent force between the first and the second windings. CONSTITUTION:A temporary iron core 3 is set at the center, a winding 2 is arranged outside the temporary iron core 3, and a winding 1 to be formed is arraged outside the winding 2. A separable form 4 for forming the winding 1 to by in a specified dimension and shape is arranged and fixed outside the winding 1. After the winding top and the winding end of the winding 1 are short-circuitted and connected, a large current is made to flow through the winding 2 in a moment. At this time, an electromagnetic repellent force in the radius direction is generated between the windings 1 and 2. The winding 1 is pressed against the mold 4, so that deformation is restrained, and the forming in a specified shape is enabled by plastic deformation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a winding used in electric equipment.

[0002]

2. Description of the Related Art Windings in electric equipment such as transformers, current transformers, and rotating machines are required to be wound on a cylinder whose insulating conductor is a mold or an insulator (hereinafter referred to as a winding form). It is manufactured by winding it only a few times. Since the outer diameter of the winding is smaller and the thermal conductivity of the winding itself is required to be higher,
The larger the space factor of the conductor in the winding, the better.

However, since the conductor itself has a reaction force against deformation, it is difficult for the conductor to adhere to the winding form and the winding expands to increase the outer diameter dimension, and the thermal conductivity decreases due to the inclusion of an air layer, so that the device is used. There was a problem that the temperature rises over time. This tendency is more remarkable when the winding is rectangular rather than circular. Therefore, when the conductor is wound on the winding form, tension is applied to the conductor or the conductor is reversely warped to be closely attached to the winding form so that there is no gap between the conductors. In this case, in order to further suppress winding swelling of the winding, the conductor may be shaped by hitting it with a jig from the outside after winding the conductor on the winding form.

On the other hand, as this type of winding, there is a winding in which a prepreg material is wound inside or on the outer peripheral portion. This winding is
After wrapping the heat shrink tape around the outermost periphery, put the winding itself in a furnace and heat it to harden the prepreg material, so that the prepreg material is heated and compressed and does not contain an air layer. Can be obtained.

[0005]

By the way, in the above-described winding manufacturing method, in order to wind the conductor on the winding form without any gap, the tension applied to the conductor is increased or the amount of reverse warpage is increased. If this happens, the conductor will be elongated, or the insulating coating of the conductor will be broken, and other problems will occur. If the conductor is wound on the winding form and then tapped from the outside with a jig, external force that is not originally necessary is applied to the conductor partially, resulting in partial deformation of the conductor or damage to the insulation coating. Is likely to occur and is not electrically preferable. Moreover, if the winding becomes large, it becomes difficult to hit the wire uniformly, and further, it takes time to form. Further, the thicker the conductor, the more force is required for molding, and there is a problem that molding becomes difficult.

On the other hand, in the case of the prepreg winding, since a sufficient compressive force cannot be applied, a prepreg layer having a uniform thickness cannot be obtained, the dielectric strength varies depending on the location, and the air conductivity is included, so that the thermal conductivity is increased. However, there is a problem that the temperature rises and the temperature rise of the winding becomes large.

The present invention has been made to solve the above problems, and a first object thereof is to provide a winding manufacturing method for easily and quickly forming a winding. is there. A second object of the present invention is to provide a method of manufacturing a winding, which enables easy and short-time molding of the winding and obtains a high-quality prepreg insulating layer.

[0008]

SUMMARY OF THE INVENTION The present invention is a method for manufacturing a winding by winding an insulated conductor a required number of times, in which the first and second windings formed by winding a predetermined number of times form a temporary core. Of the first and second windings are coaxially arranged on the outer side of the coil to generate an electromagnetic repulsive force in the first and second windings, so that at least one of the windings is It is characterized by being molded into a predetermined shape.

In the method of manufacturing a winding by winding the insulated conductor a required number of times, the first and second windings formed by winding a predetermined number of times are arranged coaxially, and the first and second windings are arranged coaxially. It is characterized in that at least one of the windings is molded into a predetermined shape by instantly flowing a large current through each of the two windings to generate an electromagnetic repulsive force in the first and second windings.

In this case, the first and second windings may be arranged coaxially outside the temporary core. When at least one of the first and second windings is provided with a prepreg material inside or on the outer peripheral portion or both,
Also, it is possible to form the winding and cure the prepreg material by utilizing the heat generation and electromagnetic repulsive force generated by instantly flowing a large current through the second winding.

[0011]

When a large current simultaneously flows through the first and second windings at the same time, a radial electromagnetic repulsive force is generated corresponding to the flowing current. If only the first winding is to be molded,
At least one of the windings is in a state of being pressed against the inside or outside of the mold, and is plastically deformed to be formed into a predetermined shape.

Since the electromagnetic repulsive force due to the large current instantaneously generates a large force, the winding can be formed in a short time, and the force can be uniformly applied unlike the case of hitting the winding. Therefore, partial deformation of the insulated conductor can be prevented.

Further, if the winding is formed by winding the prepreg material inside or on the outer peripheral portion or both of them, the temperature of the winding rises when a large current is instantaneously applied, so that the prepreg material is heated and compressed. Therefore, a high quality prepreg insulating layer can be obtained.

[0014]

FIG. 1 shows an embodiment of the present invention. The temporary iron core 3 is placed at the center, and the winding 2 is placed outside the temporary iron core 3. This winding 2
Is not a winding to be molded but a winding separately prepared to generate an electromagnetic repulsive force with the winding 1 to be molded. The winding 2 has a height dimension larger than that of the winding 1 to be molded. For example, if the winding 2 is formed by winding a sheet conductor and an insulating film, the electromagnetic repulsive force is generated in the vertical direction. Instead, it can only occur in the radial direction.
The winding 1 to be molded is arranged outside the winding 2. The winding 1 is manufactured by baking resin or winding an insulating conductor provided with an insulating coating a required number of times. A separable pad 4 for molding the winding 1 into a predetermined size and shape is arranged outside the winding 1, and is fixed with a band or the like not shown. Then, after short-circuiting the winding start and winding end of the winding 1, a large current is instantaneously applied to the winding 2. The amount of current at this time is determined in consideration of the magnitude of the force desired to be applied to the winding 1. When a current is passed through winding 2, an induced current flows through winding 1,
As shown by the arrow in FIG. 2, an electromagnetic repulsive force in the radial direction is generated between the windings 1 and 2, and the winding 1 is in a state of being pressed against the outer pressing die 4, and the deformation is restrained and the plastic deformation occurs. Then, it is molded into a predetermined shape. Also, unlike when hitting the winding wire, uniform force can be applied to the winding wire, so it is possible to prevent partial deformation of the conductor and damage to the coating, and it is possible to obtain an electrically good winding wire. it can.

The winding 1 to be molded may be arranged inside the winding 2. FIG. 3 shows an embodiment thereof, in which a pad die 4, a winding wire 1, and a winding wire 2 are arranged in this order on the outer side of the temporary core 3.
After short-circuiting the winding start and winding end of winding 1,
Even if a large current is instantaneously applied to the winding 2, the same effect as the above embodiment can be obtained.

The winding 1 wound with a prepreg material inside or around the winding or both is shown in FIG.
In the case of arranging the prepreg material as in Example 1, the temperature of the winding 1 rises when the prepreg material is pressed against the pressing die 4 and a large current is instantaneously applied, so that the prepreg material is heated and compressed. Therefore, a good quality prepreg insulating layer containing no air layer can be obtained, and the winding 1 can be molded into a predetermined shape.

The temporary iron core 3 used in each of the above embodiments is
A laminated rectangular bar-shaped iron core leg 13 inserted inside the winding as shown in FIG. 5 or a cut core type iron core 23 as shown in FIG. 6 may be used.

Further, as shown in FIG. 4, winding 2 and winding 1
Alternatively, separate power sources may be connected to both of them, and a large current may be instantaneously applied to each to generate an electromagnetic repulsive force. In this case, the temporary iron core 3 may or may not be used. Further, both the windings 1 and 2 may be molding targets. In this case, a pad mold may be provided on the outside and inside of the windings 1 and 2.

[0019]

As described above, according to the present invention, since the winding is plastically deformed by instantaneously applying a large current to the winding to be formed, the winding can be formed in a short time. It can be done in a short time, and unlike the case of hitting the winding wire, uniform force can be applied to the winding wire, so partial deformation of the conductor and damage to the coating can be prevented, and it is also electrically good It is possible to obtain various windings.

Further, in the winding in which the prepreg material is wound together with the conductor, the curing of the prepreg material and the molding of the winding can be simultaneously performed in a short time, and a good quality prepreg insulating layer containing no air layer can be obtained.

[Brief description of drawings]

FIG. 1 is a perspective view showing a method for manufacturing a winding wire according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing an electromagnetic repulsive force generated in a winding by the method of the present invention.

FIG. 3 is a plan view showing another embodiment of the method of the present invention.

FIG. 4 is a perspective view showing still another embodiment of the method of the present invention.

FIG. 5 is a perspective view showing a temporary iron core used in the method of the present invention.

FIG. 6 is a perspective view showing another example of the temporary iron core used in the method of the present invention.

[Explanation of symbols]

Reference numerals 1 and 2 denote windings, reference numerals 3 and 13 and 23 denote temporary iron cores, and reference numeral 4 denotes a patch type.

Claims (4)

[Claims] 1. A method of manufacturing a winding by winding an insulated conductor a required number of times, wherein a first winding and a second winding formed by winding a predetermined number of times are coaxial with each other outside a temporary core. And at least one of the windings is formed into a predetermined shape by instantly applying a large current to the first and second windings to generate an electromagnetic repulsive force in the first and second windings. A method for manufacturing a winding, comprising: 2. A method for manufacturing a winding by winding an insulated conductor a required number of times, wherein first and second windings formed by winding a predetermined number of times are arranged coaxially, and the first and second windings are arranged. A winding characterized in that at least one of the windings is formed into a predetermined shape by instantly applying a large current to the second winding to generate an electromagnetic repulsive force in the first and second windings. Wire manufacturing method. 3. The method of manufacturing a winding according to claim 2, wherein the first and second windings are coaxially arranged outside the temporary iron core. 4. At least one of the first and second windings is configured by disposing a prepreg material in the inner or outer peripheral portion or both, and a large current is instantaneously applied to the first and second windings, respectively. The method for manufacturing a winding according to claim 1, wherein the winding is formed and the prepreg material is hardened by utilizing the heat generated by flowing the metal and the electromagnetic repulsive force.