JPH06181130A - Wound core and it manufacture - Google Patents

Abstract

PURPOSE:To make the winding work of a coil smoother so as to prevent the bending of a conductor and damage to the insulating coating of the conductor at the time of winding a coil by forming at least the inner cross section of the coil winding section of a core formed by winding the coil around a magnetic steel plate in a circular shape. CONSTITUTION:The tittle core 1 is formed in an angular pipe having a center hole 1b and one side of the core 1 which becomes a coil winding section 1c is formed to have a nearly circular cross section. The core 1 is formed in such a way that a magnetic steel plate 1a is rolled up with a rolling device and formed in the angular pipe having an almost square cross section, the corner sections 1a around the coil winding section is removed with a grinding machine etc., until the cross section becomes circular. Since at least the inside of the coil winding section facing the hole 1b is formed to the circular shape, the coil winding work with a bobbin can be smoothly performed and, at the same time the winding speed is increased. In addition, the forcibly bending points of the coil is reduced and the occurrence of damages to the insulating coating of the conductor used for the coil is also reduced. Moreover, since the circumferential length of the coil winding section is reduced, the length of the coil required for the same number of turns is reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wound core core, in which a primary coil and a secondary coil are laminated and wound at a predetermined position and used for a transformer or the like, in order to improve efficiency of an effective area and quality. The present invention relates to an improved wound iron core and a manufacturing method thereof.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 4, a core of this type has a belt-shaped electromagnetic steel plate 1a made of silicon, permalloy, amorphous, or the like, wound by a special winding device, and has a center hole 1b.
It is used as a transformer or the like by laminating a primary coil 2a and a secondary coil 2b on one side thereof and winding them as shown in FIG. .

[0003]

Since the conventional core described above is manufactured by winding a strip-shaped electromagnetic steel sheet, its cross section is rectangular, and the winding work of the coil is difficult and the core is wound. At that time, the insulating coating of the coil may be damaged at the corner of the core, resulting in a short circuit. Further, since the cross-section is rectangular, the cross-sectional area cannot be effectively used, the size of the product is increased, and the coil to be wound requires a long conductive wire. The present invention is intended to solve these conventional problems.

[0004]

According to the present invention, in order to solve the above-mentioned conventional problems, at least an inner cross section of a coil winding portion of a core formed by winding an electromagnetic steel sheet has an arc shape. I did it.

[0005]

The coil winding portion having an arc-shaped cross section acts to smooth the coil winding work, prevents the conductor wire from bending during the coil winding, and prevents the insulation coating on the surface from being damaged. Acts to prevent. Further, it also acts to reduce the circumferential length of the coil winding portion and shorten the length of the coil required for the same number of turns.

[0006]

1 is a plan view of a wound iron core of the present invention, and FIG. 2 is a sectional view taken along the line AA '. As shown in the figure, the wound iron core 1 of the present invention has a rectangular tube shape having a central hole 1b, and a portion serving as a coil winding portion 1c on one side is formed to have a substantially circular cross section.

FIG. 3 shows another embodiment of the present invention. In this example, the flat portion 1e is left outside the coil winding portion 1c, and only the inner side facing the center hole 1b is arc-shaped. It is the one.

The wound iron core 1 is formed by winding a belt-shaped silicon steel plate or electromagnetic steel plate 1a such as permalloy or amorphous by a winding device to form a square tube having a substantially square cross section, and then winding the coil on one side thereof. It is formed by cutting and removing the peripheral corner portion 1d of the attachment portion with a grinder (not shown) or the like, and processing the cross section into an arc shape.

The wound iron core 1 of the present invention thus manufactured has the primary coil 2a wound around the coil winding portion 1c in the same manner as in the conventional case, and then the secondary coil 2 is further provided on the upper side thereof.
By winding b, it is used as a transformer or a reactor. At this time, in the wound iron core of the present invention, as described above, the inner side facing at least the center hole 1b of the coil winding portion. Since the side is formed in an arc shape without corners, winding work with the bobbin can be performed more smoothly,
The winding speed is also improved. Also, the number of places where the wound coil is forcibly bent is reduced, and the risk that the insulating coating (not shown) on the surface is damaged is also reduced.

[0010]

As described above, in the wound iron core of the present invention, at least the inner side of the coil winding portion is formed in an arcuate cross section, so that cutting of the conducting wire or bending deterioration during winding is less likely to occur. The product quality is improved, and the winding work can be performed smoothly, and the work efficiency at the time of product manufacture is improved. When the coil winding part is circular, the length of the conductor wire wound around the coil winding is 88.6% with respect to a square core having the same cross-sectional area.
A number of excellent effects are achieved, in which required conductors are reduced and the size of the transformer is reduced by increasing the efficiency of the effective area.

In addition, since the manufacturing is performed only by winding the steel sheet and then cutting the corners around the coil winding portion with a grinder or the like, no special equipment is required and the cost is hardly increased.
It has an excellent effect that it can be easily applied to small-quantity high-mix production for various electronic devices.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line A-A ′ in FIG.

FIG. 3 is a sectional view of another embodiment.

FIG. 4 is a plan view of a conventional example.

FIG. 5 is a perspective view of the coil winding state of the same.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 winding iron core 1a electromagnetic steel plate 1b center hole 1c coil winding part 1d corner part 1e plane part 2a primary coil 2b secondary coil

Claims (2)

[Claims] 1. An electromagnetic steel plate wound in an annular shape at a predetermined position,
A wound iron core core, in which a primary coil and a secondary coil are laminated and wound, wherein at least an inner cross section of the coil winding portion is arcuate. 2. A strip-shaped electromagnetic steel plate is wound to form an annular core having a substantially square cross section, and then at least an inner corner portion around the coil winding portion is removed by cutting, and the inside of the coil winding portion is removed. A method for manufacturing a wound iron core, comprising forming the cross section in an arc shape.