JP2000058352A - Manufacture of core for isolation transformer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve manufacturing efficiency by making into a constitution, where a coil is arranged between at least one first core member and a second core member fitting to the first core member. SOLUTION: In a manufacturing method of a core for an isolation transformer, a wire is wound around an annular first core member 2 by a necessary number corresponding to a purpose of the transformer, and a coil 3 is formed. At this time, by heating the coil 3 up to a specified temperature, fusing clad is mutually bonded, and a coil shape can be held. A second core member 4 is arranged on the outside of the first core member 2 on which the coil 3 is wound, and they are made to engage with each other. At this time, bonding strength of the first core member 2 on which the coil 3 is wound and the second coil member 4 may be increased by using an adhesive agent. As a result, a core 1 where the first core member 2 and the second coil member 4 are fixed, and the coil 3 is arranged between them can be manufactured. Therefore, in the core 1, the need is eliminated to insert a highly accurate formed coil into a thin coil trench with high accuracy, and assembly is facilitated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for manufacturing a core for a separated transformer.

[0002]

2. Description of the Related Art A separation type transformer has a core having coils arranged opposite to each other with corresponding coils facing each other. Electric power and electric signals are not applied between the coils by electromagnetic coupling between the corresponding coils. Transmit by contact. Such a separation type transformer is also applied to a rotary transformer in which each core rotates relative to each other. For example, the transformer is mounted on a steering device of an automobile and provided on a steering side which rotates from a steering column side fixed to a vehicle body. It can be used as transmission means for transmitting operating power and the like to the detonator.

[0003] The core of such a separation type transformer is formed, for example, by forming a coil groove extending in the circumferential direction on one surface of a disk-shaped core material, and attaching a coil formed of a ring-shaped winding to the coil groove. It is a general manufacturing method to insert or drop the winding along the peripheral surface of the coil groove to form a coil corresponding to the groove shape.

[0004]

By the way, in the separation type transformer, in order to improve the performance of the transformer, the gap between the coil and the core is made as close as possible in order to bring the coil and the core material into close contact in the coil groove. Need to be smaller. For this reason, in the manufacture of the core, an advanced technique is required for the work of inserting and dropping the coil into the coil groove.

In order to obtain desired electrical characteristics in a separated transformer, it is necessary to form a coil by winding a required number of turns of an electric wire. However, depending on the place where the transformer is installed, the radial dimension of the separation type transformer may be limited. In such a case, it is necessary to deepen the coil groove in the core and make the coil multi-layered and multiplexed.
Manufacturing of the core becomes more difficult.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and provides a method of manufacturing a core for a separated transformer in which a coil can be easily arranged in a core and manufacturing efficiency can be improved. With the goal.

[0007]

Means for Solving the Problems The present inventors have made intensive studies on the structure of a core having excellent assemblability in order to improve the manufacturing efficiency of a core for a separation type transformer. Conventionally, in order to enhance the transmission efficiency of the separation type transformer, a core material having a high relative magnetic permeability has been used, and the gap between the cores is generally reduced as much as possible. Usually, the core is integrally formed.

By the way, when the separation type transformer is used as a rotary transformer for operating an explosion unit of an airbag included in a steering portion of an automobile, accuracy of mounting on a steering or a column, rotation accuracy of a steering shaft (eccentricity). In consideration of the above, the gap between the cores is 1 m
It is desirable to set about m or more. That is, in this rotary transformer, it is necessary to satisfy predetermined functions such as power transmission and signal transmission even when a discontinuity occurs due to a gap of about 1 mm or more on a magnetic circuit (magnetic path). .

At this time, the airbag is detonated by heat generated by a resistor provided in the detonation unit. When the detonation unit is operated from the primary side of the transformer, power of 70 W to 100 W may be supplied in a short time of about 10 msec. At this time, if the transmission efficiency of power from the primary side to the secondary side of the transformer is 30%, 233 W (7
(0W ÷ 0.3 = 233W) or more can be used as the above-mentioned rotary transformer if it can be supplied instantaneously. In other words, it has been found that if power of about 233 W can be supplied from the battery, 30% is sufficient as the transmission efficiency of the rotary transformer.

Here, for example, the relative permeability of the core material is 1
0, using a separation type transformer in which the coil turn ratio between the primary side core and the secondary side core is 2, and the resistance value of the detonating unit is 2
Under the condition that Ω and the power transmission frequency were 30 kHz, the gap between the primary side core and the secondary side core was set to 1 mm, and power was transmitted. As a result, the power transmission efficiency from the primary side to the secondary side was 40%. Then, the gap is 1.1 m
m, and the power was transmitted similarly. As a result, the transmission efficiency was 35%.

From these results, it has been found that in the separation type transformer having the above configuration, even if the gap is increased from 1 mm to 1.1 mm by 0.1 mm, the transmission efficiency is 30% or more and there is no practical problem. From the above, the present inventors have obtained the knowledge that even if the gap between the cores set to 1 mm fluctuates by 0.1 mm, it functions as a rotary transformer for an airbag and does not significantly affect the predetermined performance. .

The present invention has been made based on the above findings. To achieve the above object, a method of manufacturing a core for a separation type transformer according to the present invention comprises at least one first core material,
The configuration is such that a coil is arranged between the first core material and a compatible second core material.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a method for manufacturing a core for a separation type transformer according to the present invention will be described in detail with reference to FIGS. Core 1 used for a separate transformer
As shown in FIG. 1, includes a first core material 2, a coil 3 around which an electric wire is wound, and a second core material 4 compatible with the first core material 2.

The first core member 2 is a soft magnetic material, for example, a soft magnetic ferrite sintered body formed in an annular shape, and has an insertion hole 2a at the center. The coil 3 is formed by winding the electric wire as many times as necessary for transformer use. At this time, the electric wire is, for example, a conductive wire coated with a polyurethane-based insulating film, and overlaid with a polyamide-based fused film. The coil 3 is
Outer periphery of first core member 2 and peripheral wall 4b of second core member described later
And placed between.

The second core member 4 is arranged outside the first core member 2 and is a soft magnetic material, for example, a soft magnetic ferrite sintered body formed into a substantially annular shape. The second core member 4 has an insertion hole 4a having the same diameter as the insertion hole 2a at the center, and a peripheral wall 4b at the outer periphery.
Are formed. Here, the soft magnetic material forming the first core material 2 and the second core material 4 is not particularly limited as long as it is a material having very low residual magnetism and can be used as a transformer core material. Without, for example, M
the n-Zn ferrite (Fe ₂ O _3, MnO or Mn
Soft magnetic ferrite sintered body such as CO ₃ , ZnO or the like), Ni—Zn ferrite (Fe ₂ O ₃ to which ZnO, NiO or the like is added), or Ni—Zn
Magnetic ferrite powder (maximum particle size 3
A predetermined amount (for example, 50 to 90% by weight) is mixed in a synthetic resin such as nylon or polyphenylene sulfide (PPS) having a particle diameter of 00 μm or less, preferably 100 μm or less, more preferably 3.8 μm. Soft magnetic resins can be used.

The core 1 configured as described above is manufactured as follows. First, an electric wire is wound around the outer periphery of the first annular core material 2 by the required number of turns corresponding to the use of a transformer to form the coil 3. At this time, when the coil 3 is heated to a predetermined temperature, the fusion coatings can be fused to each other, and the coil shape can be maintained.

Next, the first core material 2 around which the coil 3 is wound
The second core member 4 is arranged outside the pair and fitted together. At this time, the first core material 2 and the second core material 4 around which the coil 3 is wound
The above may mean that the adhesive strength may be increased by using an adhesive. Thereby, as shown in FIG. 1, the first core material 2 and the second core material 4 are fixed, and the core 1 in which the coil 3 is arranged between them is manufactured.

Therefore, the core 1 does not need to insert a coil formed with high precision into a thin coil groove with high precision.
Assembly is easy, and core manufacturing efficiency is improved. Here, not only one first core material but also a plurality of first core materials may be used, and an embodiment of a core using such a plurality of first core materials will be described with reference to FIGS. 2 and 3. I do.

The core 10 includes a small-diameter core material 11 and a large-diameter core material 12 as first core materials, coils 13 and 14 wound therearound, a small-diameter core material 11 and a large-diameter core material 1.
2 and a second core material 15 that is compatible with the second core material. The small diameter core material 11 is a soft magnetic material, for example, a soft magnetic ferrite sintered body formed into an annular shape, and has an insertion hole 11a at the center.

The large diameter core material 12 is made of a soft magnetic material, for example,
This is a soft magnetic ferrite sintered body formed into an annular shape, and has an insertion hole 12a at the center similarly to the small diameter core material 11.
The inner diameter of the insertion hole 12a is set to such a size that the small diameter core 11 having the coil 13 formed on the outer periphery can be inserted.
The coils 13 and 14 are electric wires wound around the outer circumferences of the small-diameter core material 11 and the large-diameter core material 12, respectively. At this time, the electric wire is, for example, a conductive wire coated with a polyurethane-based insulating film, and overlaid with a polyamide-based fused film.

The second core material 15 is made of a soft magnetic material, for example,
This is a soft magnetic ferrite sintered body formed into a substantially annular shape, having an insertion hole 15a having the same diameter as the insertion hole 11a in the center, and a peripheral wall 15b formed on the outer periphery. As shown in FIG. 2, the core 10 has a coil 1 inside the peripheral wall 15 b of the second core material 15.
The large-diameter core material 12 around which the coil 4 is wound is arranged, and the small-diameter core material 11 around which the coil 13 is wound is arranged inside the insertion hole 12a of the large-diameter core material 12.

The core 10 having the above configuration is manufactured as described below. First, an electric wire is wound around the outer periphery of the small-diameter core material 11 and the large-diameter core material 12 by a required number of turns corresponding to a transformer use, and coils 13 and 14 are formed. At this time, when the coils 13 and 14 are heated to a predetermined temperature, the fusion coatings can be fused to each other, and the coil shape can be maintained.

Next, the small-diameter core material 11 on which the coil 13 is wound is fitted to the large-diameter core material 12 on which the coil 14 is wound, and the core material and the second core material 15 are fitted to each other. I do. At this time, the small core material 11 and the large core material 12 and the second core material 15 may have an increased adhesive strength by using an adhesive.

Thus, the small-diameter core material 11 and the large-diameter core material 12 and the large-diameter core material 12 and the second core material 15
In between, the core 10 in which the coils 13 and 14 are arranged is manufactured. Therefore, according to the method of the present invention,
A plurality of coils can be easily incorporated in the core, and a multi-channel core can be easily manufactured.

Incidentally, even if the large-diameter core material 12 is fitted to the second core material 15 and then the small-diameter core material 11 is fitted, the second core material 1
After setting the small-diameter core material 11 to 5, the large-diameter core material 1
2 may be fitted to the second core material 15 and the small diameter core material 11. Here, the second core material may have a step or a concave groove into which the first core material is fitted, and the embodiment according to the core using the second core material having such a step or the concave groove may be provided. The configuration will be described with reference to FIG.

The core 20 includes a small-diameter core material 21 and a large-diameter core material 22 as first core materials, coils 23 and 24 wound therearound, a small-diameter core material 21 and a large-diameter core material 2.
2 and a second core material 25 compatible with the second core material. The small-diameter core material 21 and the large-diameter core material 22 are, like the small-diameter core material 11 and the large-diameter core material 12 in the core 10, a soft magnetic ferrite sintered body formed in an annular shape, and an insertion hole 21 is provided at the center.
a, 22a.

The coils 23 and 24 are formed by winding electric wires similarly to the coils 13 and 14 in the core 10.
Here, as the electric wire, for example, a conductive wire in which a polyurethane insulating coating is coated and a polyamide-based fusion coating is overcoated thereon is used. At this time,
On the outer peripheral surfaces of the small-diameter core member 21 and the large-diameter core member 22, the electric wires are not wound around a predetermined range of one end portions 21d and 22d of these core members.

The second core material 25 is made of a soft magnetic material, for example,
A soft magnetic ferrite sintered body having a substantially annular shape and having an insertion hole 25a in the center, and a peripheral wall 25b formed on the outer periphery. In the second core member 25, a step 25c is provided at the edge of the insertion hole 25a, and a concave groove 25d extending in the circumferential direction is provided at a predetermined position on one surface. The step 25c is adapted to the small-diameter core material 21, and the concave groove 25d is
Compatible with large diameter core material 22.

The core 20 having the above structure is manufactured as described below. First, on the outer periphery of the small-diameter core material 21 and the large-diameter core material 22, one end 21d, 2
The electric wires are wound by the required number of turns corresponding to the use of the transformer while leaving a predetermined range of 2d, and the coils 23 and 24 are formed.
At this time, when the coils 23 and 24 are heated to a predetermined temperature, the fusion coating can be fused to each other, and the coil shape can be maintained.

Next, the end 21d of the small-diameter core member 21 around which the coil 23 is wound is fitted into the step 25c of the second core member 25, and the large-diameter core member 22 around which the coil 24 is wound.
Is fitted into the concave groove 25d of the second core material 25. At this time, the small diameter core material 21 and the large diameter core material 22
The adhesive strength may be increased by using an adhesive with the second core material.

Thus, as shown in FIG. 3, between the small-diameter core material 21 and the large-diameter core material 22, and between the large-diameter core material 2 and
The core 20 in which the coils 23 and 24 are arranged between the second core material 25 and the peripheral wall portion 25b of the second core material 25 is manufactured.
According to the core 20, the small diameter core material 21 and the large diameter core material 2
Since 2 is fitted to the second core material 25, the contact area increases and the adhesion strength increases.

When the large diameter core material 22 and the small diameter core material 21 are fitted to the second core material 25, either the large diameter core material 22 or the small diameter core material 21 may be fitted first. here,
The core for a separate transformer according to the present invention may be manufactured in another mode different from the above, and such a core will be described with reference to FIGS. 4 and 5. The core 30 includes a small-diameter core material 31 and a large-diameter core material 32 as a first core material, a peripheral wall core material 33, coils 34 and 35 formed and arranged in a predetermined shape in advance, a small-diameter core material 31, A second core material 36 that is compatible with the radial core material 32 and the peripheral wall core material 33.

The small diameter core material 31 and the large diameter core material 32
Small diameter core material 11 and large diameter core material 12 in core 10
Similarly to the above, the ring-shaped soft magnetic ferrite sintered body has insertion holes 31a and 32a at the center. The peripheral wall core material 33 is a soft magnetic ferrite sintered body formed in an annular shape, and is disposed on an outer peripheral portion of a second core material 36 described later.

The coils 34 and 35 are formed by winding an electric wire by the required number of turns for transformer use.
The electric wire is obtained by coating a conductive insulating wire with a polyurethane-based insulating coating and overcoating a polyamide-based fused coating thereon.By heating, the fused coating can be fused to each other. It is possible to maintain the coil shape. As a process for holding the coil shape, a method of winding the electric wire to form a ring shape, and then applying an adhesive to hold the coil shape may be used.

The second core member 36 is made of a soft magnetic material, for example,
This is a soft magnetic ferrite sintered body formed into a substantially annular shape, and has an insertion hole 36a at the center. In the second core member 36, the positioning groove 3 extending in the circumferential direction at a predetermined position on one surface.
6d and 36d are provided. The positioning groove 36d is
This is where the coils 34 and 35 are arranged.

The core 30 having the above configuration is manufactured as described below. First, as shown in FIG. 5, the preformed coils 34, 35 are arranged in the positioning grooves 36d, 36d of the second core material 36. Next, as shown in FIG. 4, on the second core material 36, the large-diameter core material 32 is placed between the coil 34 and the coil 35 at a position where the small-diameter core material 31 communicates with the insertion hole 36 a, and the peripheral wall core material 33. Are provided on the outer peripheral portion of the second core material, respectively, and are adhered and fixed with an adhesive.

Thus, the space between the small-diameter core material 31 and the large-diameter core material 32 and between the large-diameter core material 32 and the peripheral wall core material 33
The core 30 in which the coils 34 and 35 are respectively arranged is obtained between. By the way, a core may be manufactured by molding a first core material having a coil formed on an outer peripheral portion with a soft magnetic resin.

Such another type of core will be described with reference to FIG. The core 40 is formed by molding a first core material 41 and a coil 42 formed on the outer periphery of the first core material 41 with a soft magnetic resin 43. The first core material 41 is a soft magnetic ferrite sintered body formed into an annular shape. The coil 42 is formed by winding the electric wire as many times as necessary for a transformer application. At this time, the electric wire is, for example, a conductive wire coated with a polyurethane-based insulating film, and overlaid with a polyamide-based fused film.

The soft magnetic resin 43 is made of, for example, a soft magnetic ferrite powder such as Ni-Zn or Mn-Zn (having a maximum particle size of 30).
0 μm or less, preferably a maximum particle diameter of 100 μm or less, more preferably an average particle diameter of 3.8 μm) is mixed into a synthetic resin such as nylon or polyphenylene sulfide (PPS) in a predetermined amount (for example, 50 to 90% by weight). It is a thing.

The core 40 as described above is manufactured as described below. That is, the coil 42 is wound around the first core material 41 to form a core precursor. Thereafter, the core precursor is placed in a molding die of an injection molding machine (not shown), and a soft magnetic resin 43 melted from a runner of the molding die is injected into the annular cavity at a high pressure. Thus, the soft magnetic resin 43 fills the entire cavity, and the core 40 is manufactured.

After the soft magnetic resin 43 has cooled to a predetermined temperature, the mold is opened and the core 40 is taken out. When the core of the present invention manufactured at this time is used in an environment subjected to vibration or impact, for example, it is incorporated in a steering device of an automobile, and a separated type of power transmission device for detonating an airbag device attached to the steering wheel. When used in a transformer or the like, it is necessary to increase the adhesion strength between the first core material and the soft magnetic resin so that the first core material does not peel off or fall off the core due to vibration or impact.

For the core 45 meeting such a requirement, for example, a first core member 46 shown in FIG. 7 is employed. As shown in FIG. 7, the first core member 46 has a flange portion 46a, and an electric wire 47 is wound around the outer peripheral portion by a required number of turns corresponding to a transformer application. At this time, the electric wire 47 may be adhered with an adhesive or the like to maintain the shape.

Here, the first core member 46 is made of a soft magnetic resin having the same composition as the soft magnetic resin 43 described above,
And is formed in a substantially annular shape having The first core member 46 is made of a material having a relative permeability equal to or higher than that of the soft magnetic resin to be molded so as not to deteriorate the magnetic performance of the separation type transformer. In the core 45 manufactured by molding the first core material 46 with the soft magnetic resin 43, since the first core material 46 has the flange portion 46a, the first core material 46 and the soft magnetic resin The contact area increases, the adhesion strength increases, and the flange 46a supports the end of the wire 47 wound therearound, so that the accuracy and working efficiency at the time of molding are improved.

On the other hand, for example, the first core member 48 shown in FIG.
Even if the first core member 49 shown in FIG. 9 is used, the contact area with the soft magnetic resin increases, and the adhesion strength with the soft magnetic resin can be increased. That is, the first core member 48 is formed in a ring shape, and the contact hole 48a having an appropriate depth is formed in a spot on the outer surface on which the soft magnetic resin is molded. On the other hand, the first core material 49 is formed in a ring shape, and the oblique groove-shaped contact groove 49 is formed obliquely on the outer surface on which the soft magnetic resin is molded.
a is formed. At this time, the first core member 49 forms the close contact groove 49a at an angle, forms a close contact groove in a direction parallel or perpendicular to the central axis, forms a protrusion instead of the groove, An uneven structure in which a close contact hole such as the member 48 and a close contact groove or protrusion such as the first core member 49, and furthermore, a protrusion is appropriately and randomly combined may be employed.

On the other hand, a first coil having a coil formed on its outer periphery
The core of the present invention manufactured by molding the core material with a soft magnetic resin, when used as a rotary transformer core,
Displacement due to eccentricity between the cores facing each other, and a change in the distance between the cores due to rotation caused by the falling of the facing surface, that is, a change in the gap, greatly affect the performance of the transformer.

For this reason, in the conventional rotary transformer, the manufactured core is housed in a separately prepared outer case, or the manufactured core is mounted on a mounting base or the like while being aligned. In particular, in the case of the core using the first core material made of the soft magnetic ferrite sintered body, the core is easily broken or chipped by impact or vibration, so that the outer case and the shock absorbing means are required.

Therefore, the conventional core has a problem that high manufacturing accuracy is required and manufacturing cost is high. Therefore, as a core avoiding such a problem, for example, a core 50 having a structure shown in FIGS. 10A and 10B is used.
That is, the core 50 is formed into a ring shape by molding the first core material 51 around which the coil 52 is wound with a molten soft magnetic resin 53 containing a soft magnetic material. It is provided at three places so as to protrude outward in the direction. The mounting portion 50a is integrally formed with the central screw hole 50b when the first core material on which the coil is formed is molded with the soft magnetic resin 53.

Therefore, in the manufactured core 50,
First core member 51 on which coil 52 is formed and mounting portion 50a
The position of the core 50 with the screw hole 50b can be adjusted with high accuracy by correcting the molding die, and thus is determined by an error in the molding accuracy of the core 50. In addition, FIG.
Like the core 60 shown in (b), the first core material 61 on which the coil 62 is formed is molded with a molten soft magnetic resin 63 containing a soft magnetic material into a ring shape, and attached to the outer periphery. The portion 60a is projected radially outward to 3
It may be provided at two places (two places are not shown). Mounting part 60
“a” has two screw holes 60 b, and when the first core material 61 on which the coil 62 is formed is molded with the soft magnetic resin 63, the first core material 61 is integrally formed in the vertical direction in parallel with the axial direction of the core 60. .

Further, the core 7 shown in FIGS.
0, a first core material (not shown) on which a coil is formed is fused with a soft magnetic resin 73 containing a soft magnetic material.
In addition to molding into a ring shape, mounting bases 70a may be provided at four places (two places are not shown) on the upper surface. The mounting portion 70a is provided with a tap hole 70b.

Further, like a core 80 shown in FIG. 13, a first core material (not shown) on which a coil is formed is molded with a molten soft magnetic resin 83 containing a soft magnetic material to form a ring. Molded and threaded projections 80a on the outer periphery
May be formed, and the protrusion 80a may be mounted by engaging the female screw-shaped groove formed on the mounting target. At this time, in each of the above-mentioned cores, the shape, the forming position, and the number of the mounting portion and the mounting base are appropriately changed according to the mounting strength, the shape and structure of the mounting target, and the like.

On the other hand, when higher mounting accuracy is required for the core, a positioning pin for positioning the molds with high precision at the time of molding the core may be used. In the present invention, as the first core material and the second core material, a soft magnetic ferrite sintered body formed into a predetermined shape may be used, or a soft magnetic ferrite having the same composition as the soft magnetic resin 43 described above. A resin molded into a desired shape may be used.

Further, in each of the above embodiments, the separation type transformer having a circular ring shape has been described. However, in the present invention, at least one of the core and the coil has a separation shape of a non-circular shape such as a rectangle or an ellipse in plan view. The present invention is applicable even with a type transformer structure.

[0053]

According to the method of manufacturing a core for a separation type transformer of the present invention, at the connection between the first core material and the second core material, the clearance between the fitting of the core materials,
Alternatively, when an adhesive is used, a core can be formed only by a clearance corresponding to the thickness of the adhesive layer. That is, in the magnetic circuit (magnetic path), only an extremely small gap is generated as compared with the gap between the cores of the separation type transformer.
For this reason, it is possible to construct a core for a separate transformer with good assemblability without significantly lowering the performance of the transformer, which contributes to an improvement in the manufacturing efficiency of the core for a separate transformer.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a separation type transformer core manufactured by the method of the present invention.

FIG. 2 is a cross-sectional view of a separated transformer core having a plurality of coils manufactured by the method of the present invention.

FIG. 3 is a cross-sectional view showing another embodiment of a separation type transformer core having a plurality of coils manufactured by the method of the present invention.

FIG. 4 is a cross-sectional view of a separate type transformer core manufactured by another embodiment of the method of the present invention.

FIG. 5 illustrates a method of manufacturing the core of FIG.
It is sectional drawing which shows the state which arrange | positioned the coil to the core material.

FIG. 6 is a cross-sectional view showing a core manufactured by molding a first core material on which a coil is formed with a molten soft magnetic resin containing a soft magnetic material.

FIG. 7 is a cross-sectional view showing a core manufactured by molding a first core material having a flange with a molten soft magnetic resin containing a soft magnetic material.

FIG. 8 is a perspective view of a first core material used for manufacturing a core for a separation type transformer.

FIG. 9 shows another first example used for manufacturing a core for a separation type transformer.
It is a perspective view of a core material.

FIG. 10 is a front view (a) and a plan view (b) showing another separated transformer core manufactured by the method of the present invention.

FIGS. 11A and 11B are a front view and a plan view, respectively, showing a half of still another separate type transformer core manufactured by the method of the present invention.

FIGS. 12A and 12B are a front view and a plan view, respectively, showing a half of another separate type transformer core manufactured by the method of the present invention.

FIG. 13 is a front view of still another separation-type transformer core manufactured by the method of the present invention.

[Explanation of symbols]

 1 core 2 first core material 3 coil 4 second core material 10 core 11 small diameter core material 12 large diameter core material 13,14 coil 15 second core material 20 core 21 small diameter core material 22 large diameter core material 23,24 coil 25 2nd core material 30 core material 31 small diameter core material 32 large diameter core material 33 peripheral wall core material 34, 35 coil 36 second core material 40 core 41 first core material 42 coil 43 soft magnetic resin 45 core 46 first core material 46a Collar part 47 Coil 48 First core material 49 First core material 50, 60, 70, 80 Core 51, 61 First core material 52, 62 Coil 53, 63, 73, 83 Soft magnetic resin

Claims (1)

[Claims] 1. A method of manufacturing a core for a separation type transformer, comprising: disposing a coil between at least one first core material and a second core material compatible with the first core material. .