JPS5934615A - Manufacture of small sized transformer - Google Patents

Abstract

PURPOSE:To increase the magnetic flux density as well as to reduce the value of iron loss of the titled transformer by a method wherein a directional electromagnetic steel plate is used for a wound-core and an auxiliary core. CONSTITUTION:A wound-core 4 is formed by tightly winding a directional electromagnetic band steel 1 around a spool 3, and then an auxiliary core 5 is formed by laminating a directional electromagnetic steel plate piece 2, which is same as the wound-core cut in rectangular shape having the length L2 which is equal to the height L1 of the wound-core, in such a manner that the width L3 of the steel plate piece will be made thicker than the sectional area of the wound-layer surface of the wound-core. The auxiliary core 5 is arranged in inserted form at the position where the wound-core, located between wound-layer surfaces opposing to the wound-core 4, is splitted into two parts. The area, which is wider than the cross section of the wound-layer surface of the wound-core at both ends where no winding is provided on the auxiliary core, and the wound-layer surface of both wound-cores are coupled in orthogonally intersecting manner. The auxiliary core is inserted between both cores in such a manner that the area of the coupled part is made larger than the sectional area of the wound-layer surface of the wound-core, and U-shaped pinching tools 8 and 8 having U-shaped section are inserted between the wound-cores of the auxiliary core in bridging manner, thereby enabling to fix the device in one body.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a small transformer that is mainly used as a built-in device for televisions, audio equipment, etc. A wound core of the required thickness is created by winding the band continuously and mechanically tightly in a ring shape. Separately, electromagnetic steel plate pieces that are cut into strips and are the same as the wound core are laminated to form a wound core that is the same as the wound core. A long rod-shaped auxiliary core is made, and wire is wound around this auxiliary core through an insulating material to create a secondary wire ring, and the two wound cores are
Prepare one auxiliary core, interpose the auxiliary core at a position that partially covers the core between the opposing winding lamination surfaces of the two cores, and connect the lamination surface of the auxiliary core and the winding core A method of manufacturing a transformer by orthogonally joining the layer surfaces and fixing and integrating them with clamps is known from the original invention of the present application. However,
Until now, non-oriented electrical steel sheets have been used for the electromagnetic conditioning used to make the wound core and auxiliary core, but this has drawbacks such as high iron loss, magnetic leakage flux, and increased temperature rise. Therefore, it is difficult to create a small transformer that has a high magnetic flux density. The present invention eliminates these drawbacks and improves the winding core and auxiliary core by using grain-oriented electrical steel sheets to achieve extremely high magnetic flux density and low iron loss (
The aim is to manufacture a transformer that is small and lightweight, yet can achieve three reductions in magnetic flux and temperature rise.

The method of carrying out the method of the present invention will be explained as follows based on the specific example shown in the drawings.

First, a grain-oriented electrical steel sheet with a certain thickness is slicked.
A grain-oriented electromagnetic steel strip (1) cut to the required width by a method such as that shown in FIG. A wound core (4) consisting of a layered core that is tightly wound and layered, the end of which is cut and welded to a desired layer thickness.
Build.

Next, separate from this, a grain-oriented electrical steel sheet piece (2) identical to the wound core was cut into a rectangular shape having a length L 2 ) equal to the height Ll) of the wound core and a required width (L3). Using an appropriate method, create an auxiliary core (5) by laminating the layers so that the width (L3) and the cross-sectional area of the winding core are greater than the width (L3) and the cross-sectional area of the winding core. Winding the wire with the wire diameter and number of turns through the insulating material - Secondary wire ring (6), <
7), -・Secondary side taps (6a), (6b)
and (7a) and (7b) are derived and formed.

Then, prepare two wound cores (4) and - pieces of auxiliary cores (5) made as described above, and prepare in advance all or part of the opposite wound layered surfaces of the two wound cores. As shown in the figure, an auxiliary core (5) is interposed between the winding core (4) and the winding core (5) between the opposing winding lamination surfaces of (4). , the laminated surface thicker than the winding layer cross-section type of the wound core at both ends of the auxiliary core, which will not be wound, is joined orthogonally to the winding layered surface of both wound cores, and the joint portion is An auxiliary core is interposed between both cores so that the area is larger than the laminated cross-sectional area of the core, and a bracket with a U-shaped cross section is inserted between the cores facing the auxiliary core (8), (8) They are fitted and clamped in a bridge-like manner to obtain fixed integration.

As can be seen from the above description, the present invention involves continuous mechanical winding and layering of finely cut grain-oriented electrical steel strips to create a wound core, an auxiliary core composed of grain-oriented electrical wires, and a rod-like structure formed by laminating steel plate pieces. By mechanizing all of the windings to this auxiliary core, it was possible to significantly increase the work efficiency, and by arranging the auxiliary core with the wires wound between the opposing winding layered surfaces of the two wound cores. It is very simple and easy to make a transformer by clamping and fixing it with clamps and integrating it, making it extremely easy to make a transformer (as a result, the transformer can be made quickly and the work cost can be significantly reduced).

However, the transformer obtained by the present invention has an auxiliary core with wires placed at a portion of the winding core, so that lines of magnetic force are generated equally on both sides of the auxiliary core, making it stable. Since the laminated surface of the iron core and the laminated surface of the auxiliary core are joined in a perpendicular manner, magnetic resistance is generated at the joint, and there is a risk that a temporary load may be applied at the moment of sudden inrush current. The current is small, and a reduction in inrush current and a slow zero can be obtained.

Furthermore, in this case, among the surfaces where the wound core and the auxiliary core are joined to each other, is the entire wound layered surface of the wound core? 31) Or, polish the part of the winding core to which the auxiliary core joins in advance (in addition, polish the part of the winding core to make the area of the joint with the auxiliary core larger than the winding layer cross-section of the winding core). Compared to the original invention of the present application mentioned above, the auxiliary core is interposed between the wound cores, and is made by laminating oriented electromagnetic steel sheet pieces thickly in width and cross-section of the wound core. This is effective because it can significantly reduce the magnetic resistance 1 that occurs at the joint.Also, since the wound core is made by winding and layering grain-oriented electromagnetic steel strips in a continuous state with high mechanical tightness, the winding is strong and strong. Not only can the stratification be obtained, the vibration of the copper band during magnetization and the accompanying rumbling noise can be reduced and alleviated, but also the magnetic flux density is higher than that on the shore, and the iron loss value is also lower. It is more compact (thinner) and more effective than those using electromagnetic steel sheets, and it is also effective because of the magnetic flux from the wound iron core, low temperature rise, and can be used for TVs, audio equipment, etc. There is no need for heat to build up when using the pestle in conjunction with various electrical devices such as appliances.

Next, the results of comparative experiments on the properties and shapes of transformers made using known non-oriented electrical steel sheets and grain-oriented electrical steel sheets according to the present invention are as follows.

Incidentally, the sample used in the above comparative experiment had the following specifications.

Primary side + 00V, 50Hz Secondary side 50V Capacity 100VA Also, magnetic leakage flux detection 1j, diameter l 50m
A copper wire was wound 3,000 times around a frame of m, a → non-pull was installed inside the wire, and the peak-to-peak of the waveform was measured using an oscilloscope.

[Brief explanation of drawings]

FIG. 1 is an explanatory perspective view showing one implementation of the method of the present invention, and FIG. α is a perspective view showing a partially cut away manufactured product. Figure 2 Figure 1

Claims (1)

[Claims] A grain-oriented electrical steel strip, which is formed by cutting a thick grain-oriented electrical steel sheet to the required width, is wound in a continuous and mechanically tight state in an annular shape to create a wound core of the desired thickness. Separately, pieces of grain-oriented electromagnetic steel sheets, which are the same as the wound core and cut into strips with a length equal to the height of the wound core and a required width, are laminated to a thickness greater than the width and the laminated cross-sectional area of the wound core. Make an auxiliary core, leave both ends of the auxiliary core on the side, and wind the wire with the required wire diameter and number of turns through an insulating material.A secondary wire ring is created, and the two wound cores are wound on the auxiliary core. , Prepare one auxiliary core, polish all or the portion of the winding core that faces each other on the opposite winding layer surfaces of the two winding cores, and polish the position of the winding core between these winding layer surfaces. An auxiliary core is interposed in the auxiliary core, and the ends of the auxiliary core, which are not wound, are joined perpendicularly to the winding layer surface of the core, and the area of the joint is the cross section of the winding layer of the core. A method of manufacturing a small-side transformer, which is characterized by interposing an auxiliary core between both winding cores and fixing and integrating the core with a clamping device.