JP2016219445A - Core insulation seal and magnetic core pasted with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a core insulation seal for electrically insulating the outer surface of a magnetic core, which can be pasted easily without depending on skill, while keeping cost down, and suppressing enlargement of finished outline.SOLUTION: An insulation seal 3 to be pasted to the outer surface of a magnetic core body 2 having a plurality of surfaces 2a, 2b, 2c, has a sheet-like seal body, and a plurality of seal surfaces 3a, 3b, 3c provided in the seal body, and formed according to the surface shape of the magnetic core body.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a core insulating seal and a magnetic core to which the core insulating seal is attached. For example, the core insulating seal can be easily attached to the outer surface of an annular magnetic core body, and the outer surface of the magnetic core body can be electrically insulated. The present invention relates to a core insulating seal that can be made and a magnetic core to which the core insulating seal is attached.

  A through-type current sensor is known as means for measuring the amount of current flowing in the current. This is because the electric wire to be measured is surrounded by a magnetic core, the output current generated in the secondary winding (coil) wound around the magnetic core is passed through the load resistance, and based on the voltage value obtained thereby. The amount of current flowing through the electric wire is measured.

  By the way, in order to electrically insulate the magnetic core and the winding wound around it, a method of winding an insulating tape 52 around the magnetic core body 51 as shown in FIG. 10 (hereinafter referred to as a taping method). Alternatively, as shown in FIG. 11, a method (hereinafter referred to as an in-case method) in which the magnetic core body 51 is accommodated in a case 71 and a lid 72 made of plastic resin and sealed is used (Patent Literature). 1, 2).

In the taping method, it is easy to adapt to the size and shape of the core material, and there is no gap between the core and the seal as in the in-case method. There is an advantage that it can be minimized. Moreover, there exists an advantage that the cost of the insulating tape which is material is cheap.
In addition, when winding a coil to form a current sensor, the finished outer shape does not become significantly enlarged, so that the use distance of the coil is shortened, the winding resistance is reduced, and the characteristics are improved. .

On the other hand, the in-case method is advantageous in that the work is easy and the operator's high skill is not required. In addition, since the case shape is unified, there is an advantage that there are no spots in the finish and there are few defects in the subsequent process.
Further, when winding a winding to form a current sensor, there is no unevenness on the surface, so that the winding operation can be easily performed, and there is an advantage that the coating of the winding is relatively less damaged. .

JP 2003-17347 A Japanese Utility Model Publication No. 5-41122

  However, in the taping method as shown in FIG. 10, it is necessary to wind one long insulating tape 51 around the annular magnetic core body 52, and there is a problem that the dependence on the skill of the operator is high. It was. That is, the work of winding the long insulating tape 51 through the hole portion of the ring was repeated, and at that time, it was necessary to reduce the overlapping portion as much as possible. Therefore, the work was not easy and the efficiency was poor. In addition, when winding the winding, it is necessary to wind the tape in a state where a certain amount of tension is applied to the tape. Therefore, it is not possible to use a thin tape, and there is a problem that the finished outer shape becomes large. .

On the other hand, in the case of the in-case method as shown in FIG. 11, in order to cope with the size and shape of the core material, it is necessary to produce a mold each time, and there is a problem that costs increase. Further, since the case is a molded product, there is a limit to its thinness. Furthermore, a margin must be provided between the outer shape of the core and the finished outer shape is enlarged.
Further, due to the enlargement of the finished outer shape, there has been a problem that the working distance of the winding becomes long, the winding resistance increases, and the characteristics deteriorate when winding the winding.

  The present invention has been made paying attention to the above points, and is a core insulating seal that electrically insulates the outer surface of the magnetic core, and can be easily attached regardless of the skill. An object of the present invention is to provide a core insulating seal capable of suppressing the cost and suppressing the enlargement of the finished outer shape, and a magnetic core to which the core insulating seal is attached.

In order to solve the above-described problems, an insulating seal according to the present invention is an insulating seal that is attached to the outer surface of a magnetic core body having a plurality of surfaces, and is provided on the sheet-like seal body and the seal body. And a plurality of sealing surfaces formed in accordance with the surface shape of the magnetic core body.
In addition, it is desirable that the seal body is provided with a mark indicating a crease at the boundary between a plurality of seal surfaces.
Further, when the boundary between two adjacent seal surfaces is a curve, it is desirable that at least one of the seal surfaces has a cut having the boundary as a base end.
The seal body may be divided into a plurality of parts.

  According to such a configuration, it is possible to easily attach the insulating seal to the outer surface of the magnetic core body without requiring a high level of operator skill as in the taping method. Further, since no gap is formed between the magnetic core body and the insulating seal as in the in-case method, enlargement of the finished outer shape can be minimized. In the case of the in-case method, a mold for injection-molding the case is required. However, in the case of the present invention, it is only necessary to prepare a relatively inexpensive punching die, thereby reducing the cost. it can.

In order to solve the above-described problems, a magnetic core according to the present invention is a magnetic core to which the insulating seal is attached, and includes the insulating seal and a magnetic core body having a plurality of surfaces. In addition, a plurality of surfaces of the magnetic core body are respectively attached to the corresponding sealing surfaces of the insulating seals.
According to the magnetic core configured as described above, when used as a current sensor, since the finished outer shape is less enlarged, the working distance of the winding is reduced, and the winding resistance is reduced, thereby improving the characteristics. be able to.

  A core insulation seal that electrically insulates the outer surface of the magnetic core, which can be easily applied regardless of skill, can reduce the cost, and can suppress the enlargement of the finished outer shape. It is possible to obtain a seal and a magnetic core to which the seal is attached.

FIG. 1 is a perspective view of a magnetic core to which an insulating seal according to the present invention is attached. FIG. 2 is a plan view, a side view, and a plan view of the insulating seal according to the present invention, which constitute the magnetic core body that constitutes the magnetic core to which the insulating seal of FIG. 1 is attached. FIG. 3 is a plan view showing a modification of the insulating seal according to the present invention. FIG. 4 shows another modification of the insulating seal according to the present invention. FIG. 5 shows another modification of the insulating seal according to the present invention. FIG. 6 is a plan view and a side view showing another embodiment of the magnetic core body to which the insulating seal of the present invention is attached. FIG. 7 is a plan view and a side view showing another embodiment of the magnetic core body to which the insulating seal of the present invention is attached. FIG. 8 is a plan view and a side view showing another embodiment of the magnetic core body to which the insulating seal of the present invention is attached. FIG. 9 is a plan view and a side view showing another embodiment of the magnetic core body to which the insulating seal of the present invention is attached. FIG. 10 is a perspective view showing a conventional sticking method using taping. FIG. 11 is a perspective view showing a conventional in-case method.

  Hereinafter, embodiments of the core insulating seal according to the present invention will be described with reference to the drawings. The core insulating seal according to the present invention is affixed to the magnetic core body in order to constitute a current sensor, for example. A winding is wound around the magnetic core to which the core insulating seal is affixed and used as a current sensor.

FIG. 1 is a perspective view of a magnetic core to which an insulating seal according to the present invention is attached. FIG. 2 is a plan view, a side view, and a plan view of the insulating seal constituting the magnetic core body that constitutes the magnetic core to which the insulating seal of FIG. 1 is attached.
On the outer surface (outer inner peripheral surface and upper and lower surfaces) of the magnetic core 1 shown in FIG. 1, for example, an insulating seal 3 having an adhesive layer is attached to one surface of a polyvinyl chloride sheet so that it is covered without a gap. It is in a state. That is, the outer surface of the insulator core 1 is electrically insulated.

More specifically, the magnetic core 1 is affixed with an insulating seal 3 having a sheet-like seal body shown in FIG. 2 (c) on the outer surface of the magnetic core body 2 shown in FIGS. 2 (a) and 2 (b). It is a thing.
As shown in the drawing, the magnetic core body 2 is formed, for example, in an annular shape and has a plurality of surfaces. Specifically, it has a flat upper and lower surface 2b, an outer peripheral surface 2a, and an inner peripheral surface 2c.
The insulating seal 3 has a plurality of seal surfaces formed in accordance with the surface shape of the magnetic core body 2 as shown in FIG. Specifically, it has an outer peripheral surface portion 3a corresponding to the outer peripheral surface 2a, an inner peripheral surface portion 3c corresponding to the inner peripheral surface 2c, and an upper and lower surface portion 3b corresponding to the upper and lower surface 2b.

In the magnetic core body 2, the boundary between the outer peripheral surface 2a and the upper and lower surfaces 2b and the boundary between the upper and lower surfaces 2b and the inner peripheral surface 2c are curves.
Therefore, the upper and lower surface portions 3b of the insulating seal 3 corresponding to the upper and lower surfaces 2b and the inner peripheral surface portion 3c corresponding to the inner peripheral surface 2c have a single cut that is based on the boundary between the outer peripheral surface portion 3a and the upper and lower surface portions 3b. It is formed in a continuation and has a shape in which wrinkles are unlikely to occur when pasting.

More specifically, as shown in FIG. 2C, in the insulating seal 3, a plurality of cuts 4 are formed in parallel on the inner peripheral surface portion 3 c and the upper and lower surface portions 3 b along the radial direction of the ring. As a result, a plurality of strip-shaped portions 31 having an inner peripheral surface portion 3c and an upper and lower surface portion 3b in the vertical direction are formed.
In addition, the width dimension of each strip-shaped part 31 is not specifically limited. That is, when the width is narrow, there is an advantage that the overlapping area becomes small, but there is a disadvantage that manufacturing is difficult because the number of the strip-shaped portions 31 is large. Further, when the width is wide, there is a disadvantage that the overlapping area becomes large, but since the number of the strip-shaped portions 31 is small, there is an advantage that the manufacturing is easy. As described above, the width of the strip-shaped portion 31 may be set appropriately according to the size of the magnetic core body 2 and the like because the width of the strip portion 31 is long or short.

Further, in the insulating seal 3, a mark indicating a crease (indicated by a broken line in the figure) is provided at the boundary between the outer peripheral surface portion 3a and the upper and lower surface portion 3b and at the boundary between the upper and lower surface portion 3b and the inner peripheral surface portion 3c. desirable.
By having such a fold mark, the operator can easily perform alignment when applying the insulating seal 3.

  The length L1 of the insulating seal 3 (outer peripheral surface portion 3a) is at least the outer peripheral length of the magnetic core body. Further, the height L2 of the outer peripheral surface portion 3a is substantially equal to the height dimension of the magnetic core body 2, and the radial width L3 of the upper and lower surface portions 3b is substantially equal to the radial width of the upper and lower surfaces of the magnetic core body 2. Is formed. Further, the height L4 of the inner peripheral surface portion 3c is formed to have a height dimension that is at least half the height of the inner peripheral surface of the magnetic core body 2.

In order to attach the insulating seal 3 formed in this way to the annular magnetic core body 2, first, the outer peripheral surface portion 3 a of the insulating seal 3 is wound around the outer peripheral surface 2 a of the magnetic core body 2 while being aligned. paste.
Next, a plurality of strip-shaped portions 31 (upper and lower surface portions 3b and inner peripheral surface portion 3c) are bent from the crease mark in order from the end, and attached to the upper and lower surfaces 2b and the inner peripheral surface 2c of the magnetic core body 2. In addition, about the inner peripheral surface part 3c, since the height L4 of the inner peripheral surface part 3c is short with respect to the height of the inner peripheral surface 2c, the operator uses the inner peripheral surface part 3c as the inner peripheral surface 2c. It can be easily affixed by folding it to the side.
Thereby, the insulator core 1 whose outer surfaces (outer peripheral surface, inner peripheral surface, and upper surface) are covered with the sealing surface of the insulating seal 3 is completed.

As described above, according to the embodiment of the present invention, it is possible to easily apply the insulating seal 3 to the outer surface of the magnetic core body 2 without requiring an operator's high skill unlike the taping method. it can. In addition, since no gap is formed between the magnetic core body 2 and the insulating seal 3 as in the in-case method, enlargement of the finished outer shape can be minimized. In the case of the in-case method, a mold for injection-molding the case is required. However, in the case of the present invention, it is only necessary to prepare a relatively inexpensive punching die, thereby reducing the cost. it can.
Further, when the insulator core 1 is used as a current sensor, since the finished outer shape is less enlarged, the working distance of the winding is reduced and the winding resistance is lowered, so that the characteristics can be improved.

In the embodiment, in the insulating seal 3, the inner peripheral surface portion 3c and the upper and lower surface portions 3b have a plurality of strips 4 formed in parallel along the radial direction of the ring. The shape part 31 shall be formed.
In that case, since each strip-shaped part 31 is each affixed on the upper-lower surface 2b of the magnetic body main body 2 along the circumference, the overlapping part becomes large, so that it goes to radial inside. In order to reduce the overlapping portion, as shown in FIG. 3, the gap 4 is formed between the adjacent strip-shaped portions 31, and the upper and lower surface portions 3b are formed so that the width becomes smaller toward the inner side in the radial direction. . In this case, the angle θ1 due to the side between the adjacent upper and lower surface portions 3b may be appropriately set in consideration of the curvature of the ring of the magnetic core body 2.
In that case, both sides in the height direction of the inner peripheral surface portion 3c may be formed in parallel.
According to the insulating seal 3 of FIG. 3 formed in this way, the overlapping portion of the seal can be made as small as possible.

In the above embodiment, the magnetic core 1 is formed by sticking the insulating seal 3 formed on one sheet to the magnetic core body 2. However, in the present invention, The form is not limited.
For example, as shown in FIG. 4, the insulating seal 3 may be constituted by two insulating seals 3A and 3B divided from the outer peripheral surface portion 3a along the circumferential direction.
Alternatively, as shown in FIG. 5, the insulating seal 3 may be configured by four insulating seals 3C, 3D, 3E, and 3F further divided in the radial direction.
Thus, by dividing | segmenting and comprising the insulation seal | sticker 3, the affixing operation | work to the magnetic body core main body 2 can be made easier.

Moreover, in the said embodiment, although the insulating seal 3 shall be affixed on the annular | circular shaped magnetic body core main body 2, it is not limited to this form.
For example, as shown in FIG. 6 (a) a plan view of the magnetic core body 5 and in FIG. 6 (b) a side view of the magnetic core body 5, the shape of the magnetic core body to which the insulating seal of the present invention is applied is shown. May be a U-shaped core as shown.
Alternatively, as shown in FIG. 7A, a plan view of the magnetic core body 6 and in FIG. 7B, a side view of the magnetic core body 6, the shape of the magnetic core body to which the insulating seal of the present invention is applied is shown. May be an I-shaped core as shown.

Alternatively, as shown in FIG. 8A, a plan view of the magnetic core body 7, and in FIG. 7B, a side view of the magnetic core body 7, the shape of the magnetic core body to which the insulating seal of the present invention is applied is shown. May be an annular core with a gap, as shown.
Alternatively, as shown in FIG. 9A, a plan view of the magnetic core body 8 and in FIG. 9B, a side view of the magnetic core body 8, the shape of the magnetic core body to which the insulating seal of the present invention is applied is shown. May be an E-shaped core as shown.
In any case of FIGS. 6 to 9, the sealing surface of the insulating seal 3 may be formed in accordance with the surface shape of the magnetic core body.

DESCRIPTION OF SYMBOLS 1 Insulator core 2 Magnetic body core 2a Outer peripheral surface 2b Upper and lower surfaces 2c Inner peripheral surface 3 Insulation seal 3a Outer peripheral surface part (seal surface)
3b Upper and lower surface (seal surface)
3c Inner peripheral surface (seal surface)
4 cut 5 magnetic core body 6 magnetic core body 7 magnetic core body 8 magnetic core body 9 gap 31 strip-shaped portion

Claims (5)

An insulating seal applied to the outer surface of the magnetic core body having a plurality of surfaces,
A sheet-like seal body;
A plurality of seal surfaces provided on the seal body and formed in accordance with the surface shape of the magnetic core body;
Insulating seal characterized by having.   The insulating seal according to claim 1, wherein the seal main body is provided with a mark indicating a crease at a boundary between a plurality of seal surfaces.   3. The cut according to claim 1, wherein when the boundary between two adjacent seal surfaces is a curve, a cut having the boundary as a base end is formed in at least one of the seal surfaces. Insulated seal.   The insulating seal according to claim 1, wherein the seal body is divided into a plurality of parts. A magnetic core to which the insulating seal according to any one of claims 1 to 4 is attached,
The insulating seal;
A magnetic core body having a plurality of surfaces;
A magnetic core, wherein the corresponding sealing surfaces of the insulating seals are attached to a plurality of surfaces of the magnetic core body.

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