JPH06168827A - Manufacture of rotary transformer - Google Patents

Abstract

PURPOSE:To provide a method of manufacturing a rotary transformer having good productivity while having no process of adhesive injection and coil pressure fixing and generating no coil fraying error. CONSTITUTION:This is a method of manufacturing a rotary transformer core wherein a coil fine wire of a rotary transformer consisting of a copper wire, an insulating layer, a heating burn-in layer and a solvent burn-in layer are used, a coil 2 is mounted in a groove 11 of a rotary transformer core 1 followed by being heated at 120 deg.C for 15min by a dryer 3 and fixing the coil 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary transformer coil assembly.

[0002]

2. Description of the Related Art Conventionally, a coil of a rotary transformer of this type has been manufactured by crimping a coil into a coil groove of the rotary transformer in a process as shown in FIG. 3, (a) of FIG. 3 shows an adhesive layer 4 formed by injecting an adhesive into the groove 11 of the core 1, and (b) of FIG. 3 shows a coil on the adhesive layer 4 of the groove 11 of the core 1. 2 shows a process before mounting the coil 2, FIG. 3 (c) shows the coil 2 placed on the adhesive 4 in the groove 11 of the core 1, and FIG. Crim the coil 2 of. Through this step, the coil 2 was fixed in the groove 11 of the rotary transformer. FIG. 4 shows a cross section of a coil of a conventional rotary transformer.
The conductor 8 of the wire is covered with the insulating layer 7, and the solvent fusion layer 5 is formed on the insulating layer 7.
It is the coil of the rotary transformer formed in. FIG. 5 is a partially enlarged plan view in which the coil shown in FIG. 4 is used and the coil is pressure-bonded to the groove of the rotary transformer. However, when the coil 2 is crimped to the groove 11 of the rotary transformer by the conventional method, workability is poor and there is a problem that a coil fraying defect 10 occurs due to the coil crimping.

[0003]

SUMMARY OF THE INVENTION In order to eliminate these drawbacks, the present invention fixes the coil without crimping the coil, and can provide a rotary transformer having good assembly property and no coil fraying defect.

[0004]

SUMMARY OF THE INVENTION The present invention is a method for fixing a coil to a core of a flat plate type rotary transformer without injecting an adhesive and crimping the coil, which is characterized by good assembly property and no coil fray defect. To do.
That is, the present invention is a method for manufacturing a rotary transformer, characterized in that a coil having a heat fusion layer is used, the coil is mounted in a groove of the rotary transformer, and then the coil is heated to fix the coil.

[0005]

The coil used in the rotary transformer is shown in FIG. The insulating layer 7 is formed on the conductor 8, the heat fusion layer 6 is coated on the insulation layer 7, and the solvent fusion layer 5 is formed on the heat fusion layer 6. As shown, the coil 2 is mounted in the groove 11 of the rotary transformer core 1 and heated in the dryer 3 at 120 ° C. for 15 minutes, so that the heat fusion layer 6
Is a method of manufacturing a rotary transformer in which the melted melt flows out into the groove 11 of the rotary transformer core 1 and melts and adheres without pressing the coil 2.

[0006]

1 is an explanatory view showing a step of fixing a coil to a groove of a core 1 in a method of manufacturing a rotary transformer according to the present invention. FIG. 2 is a sectional view of a coil used in the method for manufacturing a rotary transformer of the present invention.

In FIG. 2, a coil used in a rotary transformer, which plays an important role in the method for manufacturing the rotary transformer of the present invention, is called a magnet wire, and is 0.1 to 0.22 mm.
It is a thin wire, and 3 to 8 of the coils are mounted in a flat plate side by side without being stacked in parallel in the groove of the rotary transformer core. As described above, in order to bond 3 to 8 thin wires in parallel when making a coil, the coil for the core of the rotary transformer, which is loose and flat, is not completed, so the solvent fusion layer 5 should not be frayed. To form. The solvent fusion layer 5 is used by passing a coil through a thinner. In addition, the solvent fusion bonding layer 5 functions to bond 2 to 8 thin wires in parallel. The conductor 8 of the coil is a copper wire, and a urethane insulating layer 7 is coated thereon. Further, it is a coil in which the insulating layer 7 is coated with the heat fusion layer 6. The present invention uses the coil composed of the conductor 8, the insulating layer 7, the heat fusion layer 6, and the solvent fusion layer 5 described above, and the coil flows from the heat fusion layer 6 to the groove of the rotary transformer core. This is a method of manufacturing a rotary transformer that is fixed with an adhesive. By the above fixing method,
Since the coil is securely fixed, no fraying failure occurs at the groove outlet.

That is, FIG. 1 shows a method of manufacturing the rotary transformer. In FIG. 1, (a) of FIG. 1 shows a coil 11 of three rows in parallel in the groove 11 of the rotary transformer.
The process before mounting is shown. FIG. 1B shows a process of mounting the coils 2 in three rows in the grooves 11 of the core 1. Figure 1
In (c) of FIG. 2, the core 1 having the coil 2 inserted therein is put in the dryer 3 and heated at 120 ° C. for 15 minutes, and (d) of FIG.
The heat-sealing layer 6 shown in (3) is melted, and the adhesive of the heat-sealing layer 6 begins to flow into the groove 11 of the core 1 to fuse and fix the coil 2 to the bottom surface of the groove of the core 1. By performing the above steps, the coil can be fixed in the groove of the core without crimping the coil and without using a crimping jig. In addition, the conventional defect of crimping, which is a defect of coil unraveling, does not occur, and the process of coil assembly is shortened and the productivity is improved. The present invention has a similar effect even when the number of coils increases as the number of channels increases.

[0009]

As described above, according to the present invention, it is possible to provide a flat plate type rotary transformer which has a good assembling property and does not cause a coil fraying defect.

[Brief description of drawings]

FIG. 1 is an explanatory view showing steps of a coil fixing method of a method for manufacturing a rotary transformer according to the present invention. FIG. 1A is an explanatory diagram of a process before inserting the coil of the rotary transformer of the present invention. FIG. 2B is an explanatory view showing a process of inserting the coil of the rotary transformer of the present invention. FIG. 1C is an explanatory view showing a step of heating the coil of the rotary transformer of the present invention with a dryer. FIG. 1D is an explanatory view showing a process of fixing the coil by melting the heat fusion layer of the coil of the rotary transformer of the present invention.

FIG. 2 is a cross-sectional view of a coil thin wire used in the coil fixing method according to the present invention.

FIG. 3 is an explanatory view showing steps of a conventional coil fixing method for a rotary transformer. FIG. 3A is an explanatory diagram in which an adhesive layer is formed in the groove of the conventional rotary transformer. FIG. 3B is an explanatory view showing a process before mounting the coil in the groove of the conventional rotary transformer. FIG. 3C is an explanatory view showing a process of mounting the coil in the groove of the conventional rotary transformer. FIG. 3D is an explanatory view showing a process of crimping a coil with a crimping jig in a conventional rotary transformer.

FIG. 4 is a sectional view of a coil thin wire of a rotary transformer according to a conventional coil fixing method.

FIG. 5 is an explanatory diagram of a defective coil fraying product generated by a conventional coil fixing method.

[Explanation of symbols]

 1 core 2 coil 3 dryer 4 adhesive layer 5 solvent fusion layer 6 heat fusion layer 7 insulation layer 8 conductor 9 crimping jig 10 defective coil fraying portion 11 groove 12 mountain

Claims (1)

[Claims] 1. A method for manufacturing a rotary transformer, comprising using a coil having a heat fusion layer, mounting the coil in a groove of a rotary transformer, and then heating the coil to fix the coil.