JPS58101410A - Wound-core type transformer and manufacture thereof - Google Patents

Abstract

PURPOSE:To enable to mass-produce the wound-core type tranformer at a high degree of efficiency by a method wherein a laminated auxiliary core having the thickness which is specific times as thick as the cross section area of a wound- core using the same band steel as the wound-core. CONSTITUTION:The wound core 4 of the prescribed thickness is formed by winding a band steel continuously and tightly in a ring form, and, separately from the above, an auxiliary core 6 is formed by laminating electromagnetic steel plate pieces which were cut into oblong shape from the electromagnetic steel plate of the width same as the wound core 4. Two each of the above wound cores 4 and auxiliary cores 6 are prepared, the auxiliary cores 6 are interposed and arranged on the layer surface between the opposing wound layer surfaces of the two wound cores 4. Thelaminated surface of the auxiliary cores 6 and the wound layer surface of the wound cores 4 are joined together orthogonally, the primary and the secondary coils are formed by performing a winding on the auxiliary cores 6 before fixing them, and they are formed into one body by interposing and fixing the auxiliary core 6 between the wound cores 4. Through these procedures, the wound core type transformer can be mass-produced in extremely high efficiency.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a wound core type transformer equipped with an auxiliary core.

Conventionally, commonly known transformers have used a so-called laminated core, which is formed by punching and stacking electromagnetic steel sheets into an EI shape or a U shape.

The most common method of laminating this iron core is! and E
Steel plates punched in two different shapes are butted together in E and ■ shapes to form a square shape.The iron core is made by stacking the blocks 4 in a staggered manner to the desired thickness. The windings had been wound separately beforehand and were integrated into the iron core.

In another example, rectangular frame-shaped electromagnetic steel plates with a punched center part are stacked to form an iron core of a desired thickness, and rectangular electromagnetic steel plates are stacked inside the hollow part to form a bar shape, and the iron core is wound around the rectangular frame-shaped electromagnetic steel plates. There are some that fit in and integrate, but in any case,
Even if electromagnetic steel sheets could be punched mechanically, they had to be stacked manually to make the core, and there were many difficulties in stacking and laminating them into a complete core, which was a bottleneck in assembly. . Even if we add painstaking manual corrections, the gaps between each layer due to lamination,
Compared to machine-wound annular cores, the space factor was inferior, the cross-sectional area of the core was correspondingly larger, and fundamental defects were unavoidable, such as causing the beating vibration that is most common in iron cores. . In addition, it is uneconomical due to loss due to cutting scraps associated with punching the steel sheet, and it also has drawbacks such as the inability to form the core structure in a shape that takes full advantage of the properties of the electrical steel sheet, compared to annular cores. In addition to increasing the weight and size of the iron core, the above-mentioned beat vibration and magnetic flux leakage also increased, resulting in performance defects.

By the way, as a method to improve the manufacturing defect of the above-mentioned annular core, two wound cores are made by cutting an electromagnetic steel sheet to the required width.
A method of manufacturing a transformer has been proposed in which a single auxiliary core is prepared and combined, but the present invention uses a wound core and an auxiliary core with copper strips cut from electromagnetic steel sheets having the same width, and also creates a thin transformer. It is an object of the present invention to provide a method for manufacturing a wound core type transformer that can be obtained.

Hereinafter, details of the present invention will be explained based on embodiments shown in the drawings. As shown in Fig. 1, a steel strip 2 is formed by cutting an electromagnetic steel sheet 1 having a certain thickness into a required width using a slitter, and a tape is wound around a winding shaft 3 as shown in Fig. 2. A wound core 4 is produced by continuously and mechanically winding the core 4 in a tightly tightly wound manner using the following procedures and means, and further,
A bar-shaped auxiliary iron core e is made by laminating electromagnetic steel sheet pieces 6, which are cut from the above-mentioned cut steel strip 2 into rectangular shapes, by an appropriate method.

In this case, the height Ll of the auxiliary cores is the same as the height L of the wound core 4. In addition, the height Ll of the auxiliary core is set to the winding core 4.
Make it the same as the winding thickness W.

In addition, the thickness Wl of the auxiliary core 6 is determined so that the relationship between the cross-sectional area WIXL1 of the auxiliary core 6 and the cross-sectional area WxL of the wound core 4 is determined by the formula % formula % required from electromagnetic theory.
Make auxiliary core 6.

Then, as described above, between the facing layered surfaces of the two wound cores 4, 4, the layered surface of the wound core 4 and the wound layered surface of the wound core 4 are
, 4 are attached to the upper and lower surfaces of the two wound cores 4.4, and the bent portions 7a, 7a of both ends of the U-shaped fasteners 7. Auxiliary core 6 between 4,
6 is interposed and fixed to integrate.

At this time, before inserting and fixing the auxiliary core 6 between the two wound cores 4 and 4, a winding 8 is mechanically applied to the auxiliary core 6 through an insulating material. 8a and 8b, winding 8
The primary side tap 9a, 9b and the secondary side tap 9G,
Let us derive 9d.

Of course, it is possible to construct a transformer by winding the other auxiliary core 6, making this the secondary winding, and using the winding wound around one of the auxiliary cores 6 as the primary winding.

As described above, the four methods of manufacturing the wound core transformer of the present invention are as follows:
A copper strip formed by cutting a thick electromagnetic steel sheet to the required width is continuously and mechanically layered in an annular shape to create two wound cores of the required thickness. An auxiliary core is made by laminating electromagnetic steel sheets of the same width cut into strips so that the cross-sectional area is twice the cross-sectional area of the wound core, and two of the wound cores and two auxiliary cores are made. prepare, interpose an auxiliary core on the layered surface of the wound core between the opposing wound layered surfaces of the two wound iron cores, and join the laminated surface of the auxiliary core and the wound layered surface of the wound core orthogonally, Prior to fixing with clamps, wires are wound around the auxiliary core through an insulating material to form a secondary wire ring, and two of the auxiliary cores are interposed and fixed between the two wound cores. It is characterized by obtaining an integrated wound core type transformer, and by making the width of the electromagnetic steel sheet pieces constituting the auxiliary core the same as the width of the wound core, it is possible to use the same shredded pieces of electromagnetic steel sheets. This makes it possible to obtain a wound core and an auxiliary core, which enables mass production with extremely high efficiency.In addition, by reducing the width of the magnetic steel sheet pieces, the height of the transformer is extremely low, creating an ultra-thin transformer. It is also possible to do this, which is of great industrial value.

[Brief explanation of drawings]

Fig. 1 is a perspective view of an electromagnetic steel plate in the method of manufacturing a wound core transformer of the present invention, Fig. 2 is a perspective view of the manufacturing process of the wound core, Fig. 3 is a perspective view of the auxiliary core, and Fig. 4. is a perspective view of a wound core type transformer obtained by the same method, and FIG. 5 is a sectional view thereof. 1...Electromagnetic steel plate, 2...Steel strip, 3...
... Winding shaft, 4... Winding core, 6...
Electromagnetic steel plate piece, 6... Auxiliary core, 7...
U-shaped clamp, 8... Winding wire, 9a to 9d...
···Tap. Name of agent: Patent attorney Toshio Nakao and 1 other person
151 Figure 2 Figure 3 Figure 114 Figure 5

Claims (1)

[Claims] A copper strip formed by cutting a thick electromagnetic steel sheet to the required width is continuously and mechanically tightly wound in a ring shape to create a wound core of the required thickness, and the same copper strip as above is used. Make an auxiliary core laminated to a thickness that is twice the cross-sectional area of the wound core, prepare two of the above-mentioned wound cores and two auxiliary cores, and then Before interposing the auxiliary core on the layered surface of the wound core, joining the laminated surface of the auxiliary core and the winding layered surface of both cores orthogonally and fixing them with clamps, insulating material is applied to the auxiliary core. Winding the wire through
- A method for manufacturing a wound core type transformer, characterized by providing a secondary wire ring and interposing and fixing an auxiliary core between two wound cores to integrate them.