JPS6384105A - Coil for high-frequency transformer - Google Patents

Abstract

PURPOSE:To reduce the size of a coil by unstranding litz wires and winding it on a bobbin. CONSTITUTION:A bobbin 1 is rotated to unstrand litz wires 4, and the wires 4 are wound on the bobbin 1 while shaping it in a flat shape. Thus, a space formed between the wires 4 and 4 can be reduced, and the size of the coil can be reduced as compared with the case where the litz wires bundled by twisting are used to form a coil. The amount of used wires 4 can be reduced to decrease its cost. Further, the generation of a heat when a current flows through coil can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a coil for a high frequency transformer.

Conventional technology High-frequency transformers have high-frequency current flowing through the windings, so if a conductor with a large diameter is used, the current will concentrate near the surface of the conductor due to the skin effect, which is equivalent to reducing the cross-sectional area of the conductor. , the effective resistance increases and the temperature rise of the conductor increases. Therefore, when a large conductor cross-sectional area is required, thin wires are twisted into bundles or straw wire is used.

Problems to be Solved by the Invention When twisting thin wires into bundles or making coils using straw wire, the effective space factor deteriorates due to the large wire diameter of the litz wire, resulting in a large coil. There was a problem.

The present invention solves the above problems and provides a high-frequency transformer coil with a good effective space factor.

Means for Solving the Problems The present invention involves untwisting or winding the wire around a bobbin.

Effect: With the above configuration, it is possible to reduce the space created between the straight wire and the straw wire, and it is possible to reduce the size of the coil.

Embodiment Figure 3a shows the state of the coil when the Litz wire is wound around a bobbin with a round cross section without being shaped, and the same figure shows the state of the coil when it is shaped into a flat shape and wound around the bobbin. It is shown in cross section. As is clear from the figure, when comparing the distances from the center of the bobbin 1, it can be seen that the distance from the center of the bobbin 1 is shorter when the bobbin is shaped flat and wound.

Therefore, when winding the same number of turns, there is a large difference in the total length of the litz wire 4 depending on whether or not it is shaped. There is still a big difference in the finished dimensions of the coil.

Therefore, winding the litz wire 4 as flat as possible is effective for downsizing the coil and bobbin 1 and reducing the amount of wire material.

Here, a method for winding the litz wire 4 around a bobbin while making it flat will be explained using FIGS. 1 and 2.

FIG. 1 shows a method of winding the litz wire 4 around the bobbin 1 while rotating the bobbin 1 to untwist the litz wire 4 and shaping it into a flat shape. This consists of a bobbin 1 on which the litz wire 4 is wound, a winding shaft 2 that fixes the bobbin 1 and rotates the litz wire 4 inward in a direction parallel to the litz wire 4, and supporting the shaft 2 and the litz wire 4
The litz wire is composed of an untwisting shaft that rotates in a direction perpendicular to the direction of unwinding the strands of the litz wire. The operations of the winding shaft 2 and the untwisting shaft 3 are related to each other, and the winding shaft 2 rotates by the length of the untwisted Litz wire by the untwisting shaft 3. The relationship is such that it is wound around bobbin 1.

Further, FIG. 2 shows a method of winding the straw wire 4 around the bobbin 1 while cutting it to a required length or shaping the straw wire 4 into a flat shape. This consists of a bobbin 1 for winding the litz wire 4, a winding shaft 2 for fixing the bobbin 1 and winding the litz wire 4 in a direction parallel to the litz wire 4, and a winding shaft 2 for winding the litz wire 4 in a direction parallel to the litz wire 4. It consists of a shaping jig 3 for shaping the wire 4 into a flat shape while untwisting it.

Since the straw wire 4 is cut to a required length in advance, one end is set in the shaping jig 3 and the other end is left free, so that the litz wire 4 is generated when passing through the shaping jig 3
Since the other end is free, the return of the twist is naturally absorbed.

Here, the total length of the litz wire when wound with a round cross section is Nl + the winding resistance is R1, and the total length of the glued wire when wound with a flat cross section is 12 degrees, and the winding resistance is R2. Then, when the same number of turns is wound, l! 1> (J2.R
, > R2. Therefore, by adopting the present invention, 1. The amount of Litz wire used can be reduced by -12 minutes, reducing costs and at the same time, the finished size of the coil can be made smaller. Furthermore, when electric current is passed through the coil, heat loss is lost as heat loss, so there is an advantage that the amount of heat generated is reduced by force 2 (R+R2).

By shaping the Litz wire into a flat shape and winding it around the bobbin, the process of flattening and winding it around the bobbin can be done at the same time, reducing the number of man-hours compared to doing them separately.

As can be seen from the effects of the invention, the present invention makes it possible to efficiently manufacture a small coil using the minimum necessary litz wire, and to create a high-frequency transformer coil that is made of a small and lightweight coil that suppresses heat generation at low cost. realizable.

[Brief explanation of the drawing]

Fig. 1 is a winding explanatory diagram showing a method of winding a coil for a high frequency transformer according to an embodiment of the present invention, Fig. 2 is a winding explanatory diagram showing another winding method, and Figs. 3 a and b respectively. FIG. 3 is a winding sectional view of a litz wire according to a conventional example and an embodiment of the present invention. 1...Bobbin, 4...Litz wire. Name of agent: Patent attorney Toshio Nakao and 1 other person/-
M-Bobbin No. 1 Fig. 4 - Re-Sotsu stock Fig. 2 Fig. 3

Claims (1)

[Claims] A high-frequency transformer coil made by untwisting or wrapping fluorocarbon wire around a bobbin.