JP2591856Y2 - Transformer coil - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a transformer coil.

[0002]

2. Description of the Related Art Transformer cores and coil parts are generally
As shown in FIG. 2, an iron core 1 having a square cross-sectional shape, two paper-wrapped flat electric wires 4 having the same thickness per turn are superimposed on each other, and a rectangular coil 2 formed by winding into a square, and a paper-wrapped flat electric wire 4 are formed. It is constituted by a bobbin 3 of a press board to be wound. At four corners of the bobbin 3, the paper-wrapped rectangular electric wire 4 is used to prevent the paper-wrapped rectangular electric wire 4 from being extremely bent and the paper coating from being damaged.
And chamfered required to secure the necessary minimum bend radius R ₂ of. Therefore, a gap is formed between the iron core 1 and the bobbin 3. That is, the gap H ₂ between the iron core 1 and the square coil ₂
Can be. Since the chamfer angle of the bobbin 3 is 45 degrees,
Assuming that the thickness of the press board of the bobbin 3 is A, the gap H ₂
Is represented by H ₂ = (R ₂ −A) ÷ 2 + A, and when rearranged, H ₂ = (R ₂ + A) ÷ 2 ÷ (1). Further, the thickness T ₂ and the required minimum bending radius R ₂ of the paper wound rectangular electric wire 4 are in a relationship where the required minimum bending radius R ₂ increases as the thickness T ₂ increases.

[0003]

An invention to be Solved] However, in this conventional configuration, the thickness T ₂ of the cigarette rectangular electric wire 4 is increased,
Since larger required minimum bend radius R _2, from the equation (1), a clearance of H ₂ and the iron core 1 and the angular coil 2 increases.
That is, there is a problem that the outer dimensions of the square coil 2 become large. The present invention is a necessary minimum bending radius R ₂ and smaller than the conventional, and an object thereof is to provide a transformer coil capable of reducing the external dimensions.

[0004]

According to the present invention, a plurality of paper-wrapped rectangular electric wires having different thicknesses per turn are superposed in the order of the thickness dimension, and are wound in a rectangular shape such that the paper-wrapped rectangular electric wire having the smallest thickness is on the inside. Formed.

[0005]

With the above construction, the innermost layer of the rectangular coil is a thin paper wound flat rectangular wire and the required minimum bending radius can be reduced, so that the gap between the iron core and the rectangular coil can be reduced.

[0006]

FIG. 1A shows an embodiment of the present invention.
Is formed by using two paper-wrapped rectangular electric wires having different thicknesses per turn, and superposing and winding a paper-wrapped rectangular electric wire 6 having a smaller thickness than the paper-wrapped rectangular electric wire 5 inside the paper-wrapped rectangular electric wire 5. At this time, as shown in FIG. 1 (b), the thickness of the thin rectangular wound wire 6 is T ₁ , the required minimum bending radius of the thin rectangular wire 6 is R ₁ ,
The thickness of the paper wound flat wire 5 is T ₃ and the required minimum bending radius is R.
Assuming that ₃ , the thickness T ₁ of the thin paper-wrapped rectangular electric wire 6
And the thickness T ₃ of cigarettes rectangular electric wire 5 is selected to satisfy _{T 1 + T 3 = 2 ×} T 2 and _{T 1 + R 1 = R 3} . Here, since T ₁ <T ₂ <T ₃ , R ₁ <R ₂ <R ₃ ─── (2). Clearance H ₁ between the core 1 and the angular coil 2 is represented by _{H 1 = (R 1 -A)} ÷ 2 + A, and rearranging, the _{H 1 = (R 1 + A} ) ÷ 2. Conventionally configured iron core 1 represented by the above relational expression (1)
When compared with the gap H ₂ between the coil 2 and the square coil 2, the gap H ₁ becomes smaller by the difference between the required minimum bending radii R ₁ and R _{2 according to} the relational expression (2). Can be smaller.

[0007]

According to the present invention, as described above, the gap between the iron core and the square coil can be made smaller than that of the conventional configuration.
The external dimensions of the angle-divided coil can be reduced.

[Brief description of the drawings]

FIG. 1 is a diagram showing an example of a transformer coil of the present invention.

FIG. 2 is a diagram illustrating an example of a conventional transformer coil.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Iron core 2 Square coil 3 Bobbin 4 Paper wound flat wire 5 Thick paper wound flat wire 6 Thin paper wound flat wire

Claims (1)

(57) [Scope of request for utility model registration] 1. A plurality of paper-wrapped rectangular electric wires having different thicknesses per turn are superimposed on a rectangular iron core in a thickness dimension, and the paper-wrapped rectangular electric wire having the smallest thickness is bent inward to form a rectangular shape. Transformer coil formed by winding.