JPH0344014A - High frequency transformer - Google Patents

Abstract

PURPOSE:To keep an iron core in a specific shape without increasing the size of a transformer for providing a compact high frequency converter with small loss by a method wherein reinforcing members are housed in a leg and a yoke of a transformer coil in separate parts and then integrally assembled. CONSTITUTION:An iron core leg reinforcing member 5 is placed at a slit inside an iron core window of an iron core leg 2a and a coil bobbin 4. Inside the window of an iron core yoke 1b, an iron core yoke reinforcing member 6 is plated, The end of the iron core leg reinforcing member 5 is folded so that the folded part 5a is brought into contact with the ion core yoke reinforcing member 6 and both are fixed with a screw 7. Since the iron core reinforcing members are housed in small separate parts, excessive deformation is not applied to the iron core. Since the respective parts are tightly fixed by the screw, an apparatus is free from stress of winding and external force during operation as a transformer thereby maintaining stable characteristics.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a reinforcing structure for a high frequency transformer core formed by winding an amorphous magnetic alloy ribbon.

[Conventional technology]

The amorphous magnetic alloy ribbon has a thickness of approximately 25 μm, and has low rigidity, so when used in the wound core of a transformer, it must be reinforced so that the core can stand on its own. As this reinforcing structure, a method has been proposed in which a reinforcing frame is interposed within the window of the iron core, as described in Japanese Utility Model Application Publication No. 60-179024. As shown in FIG. 7 of the same publication, a method of assembling divided members into a window is shown as the structure of the reinforcing frame.

[Problem to be solved by the invention]

In the conventional structure described above, if a reinforcing frame having sufficient strength to reinforce the core is incorporated, the circumference of the winding increases, leading to an increase in transformer dimensions and loss. Conversely, if the reinforcing frame is made smaller in order to make the transformer smaller, the iron core deforms from its original shape during the winding process, creating stress and increasing iron loss. In transformers that operate at high frequencies that exceed commercial frequencies, the magnetic circuit of the core is designed so that the temperature rise is at the upper limit of the allowable value, so increased iron loss immediately leads to malfunction of the transformer.

On the other hand, if the transformer is designed with a margin for temperature rise, the transformer will become larger.

The purpose of the present invention is to provide a compact, low-loss high-frequency wound core transformer by realizing a core reinforcing structure that can maintain the core in its original shape without increasing the transformer dimensions. It is in.

[Means to solve the problem]

In order to achieve the above object, the present invention divides the reinforcing frame inside the core window into a core leg part and a yoke part, and incorporates members made of optimal materials and shapes for each part into the core window. rear,
Each member is fastened and fixed. That is, the reinforcing member that comes into contact with the core leg is arranged in the gap between the core leg and the winding bobbin, and the reinforcing member that comes into contact with the core yoke is formed in close contact with the inner peripheral surface of the yoke so that both are fastened at the yoke.

[Effect]

In the above configuration, the core leg reinforcing member is placed in the gap between the core leg and the winding bobbin, so there is no need to increase the inner diameter of the winding, and it is possible to increase the size of the transformer or increase the length of the wire. Increased losses can be prevented. In addition, the self-weight of the core is maintained evenly by the yoke reinforcing member provided in contact with the core yoke part, and furthermore, by firmly fastening the reinforcing member of the # part and the yoke part,
It is possible to prevent the deformation of the iron core during winding work.
B. It is possible to prevent force and avoid an increase in iron loss. 3.
[Example] Hereinafter, an example of the present invention will be described with reference to FIG. The upper figures (a) and (b) each show a Q-ab-b' view. In FIG. 1, a transformer 1 has a winding 3 wrapped around a wound core 2 which is formed by winding, forming and annealing amorphous magnetic alloy thin cloth.
Place and configure. The winding 3 is constructed by winding an electric wire while rotating a winding bobbin 4 provided on the leg portion of the iron core 2. The following configuration is adopted as a reinforcing structure for the iron core 2 according to the present invention. First, the core leg reinforcing member 5 is placed in the space between the core leg 2a and the winding hobbin 4 inside the core window.

On the inside of the window of the core yoke part 2b, there is a core yoke reinforcement
Place. The end of the core leg reinforcing member 5 is folded 1111L.
The bent portion 5a is arranged so as to come into contact with the core yoke reinforcing portion 4A6, and both are secured with a set screw 7 and identified.

FIG. 2 shows an enlarged view of the joint portion indicated by ■ in FIG. 1(b). In order to arrange the core leg reinforcing member 5 between the core leg 2a and the winding bobbin 4 without enlarging its diameter, its width is set to be smaller than the width of the core leg 2a. Further, in order to maintain the weight of the core 2, the core yoke reinforcing member 6 preferably has a width equal to or greater than the width of the core 2. and,
To fix the core leg reinforcing member 5 and the core yoke reinforcing member 6, a set screw 7 without a protrusion on the head is used, thereby eliminating a protrusion in the core window.

In this configuration, the core leg reinforcing member 5 is required to be made of a material that is non-magnetic and has high rigidity, so it is appropriate to use a stainless steel plate.

On the other hand, the core yoke reinforcing member 6 is preferably made of an insulating material, such as an epoxy resin laminate, in order to form a closed circuit together with the core leg reinforcing member 5 and prevent eddy currents caused by high frequency excitation.

According to this embodiment, there are the following effects.

(1) Since the core reinforcing member is divided into small parts and assembled into the window, no undue strain is applied to the core.

OL) Since each part is firmly fixed with set screws, there is no stress during winding work or deformation due to external force during operation as a transformer, and stable characteristics can be maintained.

(iii) Optimal materials can be used for the core legs and the yoke, and reinforcing members of optimal shapes can be provided, thereby eliminating dimensional increases and property deterioration.

〔Effect of the invention〕

According to the present invention, reinforcing members made of the most suitable material and having the most suitable shape are installed in the legs and yoke parts of the transformer-wound core, respectively.
Since it is constructed so that it is assembled into the body after being assembled as individual parts, the core can be held in the specified shape without increasing the dimensions of the transformer, resulting in a compact high-frequency transformer with low loss. equipment can be provided.

[Brief explanation of drawings]

FIG. 1 is a partial cross-sectional view showing the structure of a transformer according to an embodiment of the present invention, and FIG. 2 is an enlarged view of the section (■) in the upper figure. 1...Transformer, 2.2a, 2b, iron core, 3...winding,
5 Iron core leg reinforcing member, 6... Core yoke reinforcing member, 7...
Don't stop it.

Claims (1)

[Claims] 1. A transformer that operates at a frequency exceeding the commercial frequency, which is constructed by winding an amorphous magnetic alloy ribbon into a predetermined shape and then subjecting it to strain relief annealing to form an iron core, and winding electric wires around the legs of the iron core. A high-frequency transformer according to the present invention, wherein reinforcing members formed independently in contact with the leg portion and the yoke portion are attached within the window of the iron core, and the two are fastened within the window of the iron core.