JPH0864432A - Electromagnetic device - Google Patents

Abstract

PURPOSE: To reduce a leaked magnetic flux and increase a coupling ratio of a primary coil and a secondary coil when the primary coil and secondary coil are dividedly arranged in a transformer using a CI type core. CONSTITUTION: A pair of C type core Cx and I type core Ix comes into contact with each other and a gap G is provided at both ends of the I type core Ix to form a magnetic path to obtain a transformer using a CI type core. Therein, primary and secondary coils N1, N2 are dividedly wound on the I type core Ix and the primary coil N1 is arranged in a center of the I type core Ix and the secondary coil N2 is divided into two parts which are arranged at both the sides. An O type core may be used instead of the I type core.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic device having a core and a coil, and is used, for example, in a pulse transformer used in an igniter circuit in a lighting device.

[0002]

2. Description of the Related Art Conventionally, as a core shape of an electromagnetic device, FIG.
Various core shapes as shown in 1 (a) to (d) are used. In the figure, Ex is an E-type core, Ix is an I-type core, and U.
x is a U-shaped core and Cx is a C-shaped core. (A) is an EE core combining E-type cores and E-type cores, (b) is an EI core combining E-type cores and I-type cores, (c) is a UU core combining U-type cores and U-type cores , (D) is a CI core in which a C-type core and an I-type core are combined. Of these, the CI core of FIG. 31 (d) is a coil in which a gap is provided at both ends of an I-shaped core to form a magnetic path, and the gap is divided into two at both ends of the I-shaped core. It is possible to provide an electromagnetic device that has less magnetic flux interlinking with and less loss and heat generation. Further, since the gaps are arranged at both ends of the I-shaped core around which the coil is wound, the dimensional accuracy of the I-shaped core and the C-shaped core has little influence on the electrical characteristics and is stable. Therefore, in the CI core, the magnetic flux leaking to the outside of the electromagnetic device is extremely small as compared with other core shapes, and there is no influence on the external electronic parts (case, capacitor, semiconductor heat sink, or other electromagnetic device), and the electric Deterioration of characteristics and equipment efficiency,
It is possible to avoid heat generation, noise, and noise.

FIG. 32 shows the structure of a transformer using a CI core. In the figure, N1 is a primary winding and N2 is a secondary winding, and the primary winding N1 and the secondary winding N2 are laminated via an interlayer insulating paper 5. In this way, the secondary winding is laminated on the bobbin B, and insulation is provided on the bobbin B by the interlayer insulating paper 5,
Further, in the winding structure in which the primary winding N1 is laminated from above, when the secondary winding N2 has a very high voltage, the interlayer insulating paper 5
However, the insulation performance between the primary and secondary windings N1 and N2 is significantly deteriorated due to the step-down of the primary winding N1 and the like, so that it is necessary to take measures such as a step-fall prevention means. There is also a problem that the winding capacity increases due to the lamination.

Therefore, in such a pulse transformer for generating a high voltage, a method of winding the primary winding N1 and the secondary winding N2 separately is often adopted as shown in FIG. 33 or FIG. FIG. 33 shows the secondary winding N2 having a large number of divisions to reduce the winding capacity, and FIG. 34 shows the secondary winding N2.
Is divided into two and the voltage applied to the secondary winding N2 is divided into two. This is the primary winding N1 and the secondary winding N2
Is completely independently wound by the split bobbin B, so 1
The insulating performance between the secondary and secondary windings N1 and N2 is very good, the winding capacitance is small, and pulses can be transmitted well. Therefore, also in the transformer using the CI core shown in FIG. 32, as shown in FIG. 35, a structure in which the primary winding N1 and the secondary winding N2 are separately arranged by using the split bobbin B can be considered.

[0005]

Problems to be Solved by the Invention As shown in FIG.
In the primary and secondary split transformers using the CI core, the position of the primary winding is near the gap part formed by the CI core. The primary winding is an exciting winding, and when the primary winding is arranged near a space portion other than the core such as a gap portion, 1
A part of the main magnetic flux generated by the secondary winding easily escapes in the space having low magnetic permeability, increasing the leakage magnetic flux. For this reason, in the primary and secondary winding split transformer using the CI core as shown in FIG. 35, the coupling ratio of the primary and secondary windings decreases,
The coupling ratio may be lower than that of the UU core of FIG. 33, the EI core of FIG. 34, etc., and the characteristics of the CI core cannot be fully utilized.

[0006]

According to the present invention, in order to solve the above-mentioned problems, as shown in FIG. 1, a C-type core Cx and an I-type core Ix are contacted with each other, and the I-type core Ix In a transformer using a CI type core having a gap G at both ends to form a magnetic path, a primary winding N1 and a secondary winding N1 and N2 are divided and wound around an I type core Ix. Type I core I
It is characterized in that it is arranged in the center of x and the secondary winding N2 is divided into two parts on both sides thereof. Further, as shown in FIG. 3, an O-type core Ox may be used instead of the I-type core Ix.

[0007]

In order to solve the above problems, the present inventor has researched a split winding method capable of suppressing a decrease in the coupling ratio between the primary winding N1 and the secondary winding N2. As shown in FIG. 4A, using an I-shaped core Ix having a length of 40 mm, one end of the I-shaped core Ix is set as an origin (x = 0), and x is set in the axial direction of the I-shaped core Ix.
Taking the axis, the distance in the x-axis direction of the center of the primary winding N1,
The relationship with the coupling ratio with the secondary winding N2 at that time was investigated.
As a result, as shown in FIG. 5, the center of the I-type core (x = 20 m
It was found that in the case of m), the binding ratio was the highest. In FIG. 5, the horizontal axis represents the distance x to the center of the primary winding N1.
(Mm), and the vertical axis represents the coupling ratio between the primary winding N1 and the secondary winding N2. However, the value of x of the secondary winding N2 is 5 mm
When <x <35 mm, it is divided as shown in FIG. 4 (c), and is arranged as shown in FIG. 4 (b) for other values of x.

As in the present invention, the primary winding N1 is arranged in the center, and the secondary winding N2 is arranged on both sides of the central winding N1 to form a split winding, so that the magnetic flux excited by the primary winding N1 leaks. The action of making it difficult to lower the coupling ratio is a action peculiar to the core shape having the gap G at both ends of the I-type core Ix such as the CI core. 6A to 6D, a drum type,
The results of analyzing the flow of the magnetic flux Φ for various core shapes such as EI type, LL type, and CI type are shown. As can be seen from this figure, in the case of core shapes other than the CI type core shape, winding windings are wound. Leakage magnetic flux is generated so as to cross the window frame to be covered, and even if the primary winding is arranged in the center, the leakage magnetic flux cannot be suppressed, and an increase in the coupling ratio cannot be expected. However, in the CI type core structure, since the leakage magnetic flux can be concentrated near the gap portion, when there is the primary winding N1 near the center of the I type core Ix, leakage of the magnetic flux at this portion is unlikely to occur, The coupling ratio can be increased.

[0009]

FIG. 1 shows an embodiment of the present invention. As shown in the figure, the bobbin B used for the CI core is divided into three parts.
The secondary winding N1 is arranged at the center of the three divisions, and the secondary winding N2 is divided into two and arranged at both ends of the primary winding N1. As a result, the primary winding N1 is located at the center of the I-shaped core Ix, and
The magnetic flux generated by the next winding N1 is sufficiently retained in the core,
Leakage magnetic flux can be reduced and primary and secondary windings N
The coupling ratio between 1 and N2 can be increased. Further, since the primary winding N1 is sandwiched by the secondary winding N2, there is an effect of sandwich winding, and the coupling ratio can be further increased. Therefore, this pulse transformer can improve the insulation performance by split winding, improve the pulse transmission performance by reducing the winding capacitance, and further improve the pulse transmission performance with a high coupling ratio, and increase the pulse peak value. You can

FIG. 2 shows a specific structural example of this embodiment. As shown in the figure, the bobbin B has a one-layer secondary winding N2,
The primary winding N1 and the secondary winding N2 are arranged side by side, and an insulating distance is provided by the collar 1 between them, and the bobbin B having the I-shaped core Ix inserted therein is housed in the case 4. At this time, the bobbin B and the case 4 are fitted with the fitting concave portion 2 and the fitting convex portion 3.
It is fixed by and does not rotate. To increase the pressure resistance, this is filled with an insulating agent. Then, the C-shaped core Cx is fitted into the case 4 to form a pulse transformer. In this embodiment, a gap is provided at both ends of the I-shaped core Ix to form a magnetic path together with the C-shaped core Cx. Winding coil N1, N
Since 2 is wound one more, the winding capacity is very small and the coupling ratio is high, so the pulse transmission performance is very good.

FIG. 3 shows another embodiment of the present invention. In this embodiment, an O-shaped core Ox and an I-shaped core Ix are in contact with each other.
I core is used. Bobbin B is divided into three, and 1
The secondary winding N1 is arranged at the center of the three divisions, the secondary winding N2 is divided into two, and they are arranged on both sides of the primary winding N1. As a result, the same effect as in the case of the CI core can be obtained.

By the way, coil components such as transformers and chokes include distributed capacitance generated between windings. In particular, when the windings are close to each other such as the number of turns is large or the windings are stacked, the distributed capacitance becomes very large. In the pulse transformer used in the igniter circuit of the lighting device, in order to improve the transmission to the secondary side of the transformer, it is desired to reduce the distributed capacitance generated in the transformer. However, since the pulse transformer needs to generate high-voltage pulses, the number of turns on the secondary side of the transformer is generally several hundreds of turns, and when it is wound in layers, it has a very large distributed capacitance. As a means of reducing this distributed capacitance, it is conceivable to wind the winding in a single layer.
Since the number of windings is large, the winding shaft becomes very long and the coil becomes long and large.

In recent years, a technique has been developed in which a rectangular wire having a thickness of several hundreds of μm is wound vertically in the shape of a sonolaid coil. Therefore, by using this winding coil, the winding width of a fraction of the conventional one can be further improved. A wound coil is now possible. However, this winding coil cannot be wound directly on the core or the core insulating bobbin, and can only be wound in a circular shape.

An example using this ultrathin rectangular wire wound coil is shown in FIGS. This example is a common mode choke coil for a noise filter using two ultra-thin flat wire winding coils N. As shown in FIG. 7, two cylindrical bobbins B each having a coil N inserted therein are created, and as shown in FIG. 8, they are attached to two U-shaped cores Ux. Since it is a single-layer winding, the distributed capacitance is smaller than that of a multi-layer winding, the resonance frequency with the inductance value of the coil can be increased, and the common mode choke coil has a filter effect up to a higher frequency. Further, the shape is smaller than that of the conventional single-layer winding model or multi-layer winding model of the round cross-section winding.

In the example of FIGS. 7 and 8, the bobbin and the coil are not fixed, so the position of the coil is unstable with respect to the core, and the coil moves back and forth or rotates. For this reason, it is difficult to fix the winding terminal of the coil to the determined position, and it takes a lot of time and effort to mount the coil on the printed circuit board or the like. In addition, when the voltage applied to the coil is a high voltage of several KV to several tens of KV, if the position of the terminal is unstable, a rare short circuit or the like may occur, which causes a problem in breakdown voltage. Further, when the number of winding coils is two or more, that is, when the winding coil is divided into two or more and arranged on one bobbin, the insulation distance between the divided winding coils is not ensured and the withstand voltage is increased. Performance drops significantly. Furthermore, when connecting the winding coil terminal to the pin terminal, it is difficult to twist the winding coil terminal to the pin terminal by a method of twisting the winding coil terminal to the pin terminal like a conventional winding wire having a circular cross section, and Even if it is tangled in the pin terminal, it will be bulky and the tangled portion will be very large. In addition, when the terminal is pulled out from the winding coil and connected to the pin terminal, the terminal wire is distorted and distorted.

Therefore, an example of a structure for fixing the bobbin and the coil terminal is proposed in FIGS. 9 to 11. In this structure, as shown in FIG. 11, a groove 12 is provided on the outer peripheral surface along the axial direction of the cylindrical bobbin B. The collar 10 that is inserted into the cylindrical bobbin B has a through hole 11 through which the bobbin B passes, a protrusion 13 that fits into a groove 12 of the bobbin B,
And guidelines 14 and 15 for fixing the winding coil. On the cylindrical bobbin B, as shown in FIG.
Insert the ultra-thin flat wire vertical winding coil N, and then spit 10
Is inserted into bobbin B, and subsequently, winding coil N,
The collar 10 is inserted into the winding coil N and the bobbin B.
After inserting the winding coil N and the collar 10 into the bobbin B in this manner, as shown in FIG. 9, the I-shaped core Ix is inserted into the bobbin B and the convex portion 3 that fits into the groove 12 is provided. After being housed in the case 4 and filling the gap between the bobbin B and the case 4 with the insulating resin, the C-shaped core Cx is regulated and held by the brim of the case 4 and arranged on the outer surface of the case 4. At this time, the winding coil N is integrated with the collar 10 by the guide lines 14 and 15, the collar 10 is integrated with the bobbin B by the protrusion 13 and the groove 12, and the bobbin B is the case 4 by the groove 12 and the convex portion 3. Since it is integrated with, when filling the resin,
The winding coil N does not rotate or shift laterally, and the position of the winding terminal is always fixed. Further, since the collar 10 is interposed between the winding coils N arranged in a divided manner, the insulation performance is excellent. By simply inserting the winding coil N and the collar 10 into the bobbin B alternately, it is possible to create any number of divided coils, and they are all integrated.

Next, FIGS. 12 to 16 show other structural examples for fixing the winding terminals to the bobbin. 14 and 15
Shows a structure in which the cylindrical bobbin B and the collar 10 are integrally molded. FIG. 14 shows the front side structure, and FIG. 15 shows the back side structure. The collar 10 integrated with the cylindrical bobbin B has a guideline 1 for fixing the winding coil around the collar 10.
4 and 15 and a through hole 11 at the center thereof.
have. A fitting portion 16 is provided at the end of the cylindrical bobbin B. The fitting portion 16 of the cylindrical bobbin B is
It is fitted into the through hole 11 of the other collar 10. A groove 12 is provided on the outer peripheral surface of the fitting portion 16, and the groove 12 is joined to a protrusion 13 provided on the inner peripheral surface of the through hole 11. FIG. 16 shows the structure of the collar 20 arranged at the end. The structure on the front side and the structure on the back side are the same. The collar 20 does not have a bobbin but is attached to an end portion thereof, and has guide lines 24 and 25, a through hole 21, and a protrusion 23. As shown in FIG. 13, a winding coil N is arranged on the cylindrical bobbin B having the collar 10 shown in FIGS. 14 and 15, and the winding coil N is arranged according to the number of divisions of the winding.
The cylindrical bobbin N having the collar 10 is connected, and finally the collar 20 shown in FIG. 16 is connected. The winding coil N includes the guide lines 14 and 15 of the collar 10 and the collar 20.
It is fixed by the guidelines 24, 25 of. Brim 10
Mutually or brims 10 and 20 are protrusions 13 and 23 and groove 1
The two are fitted and integrated. In this way, the integrated coil has the core Ux inserted therein, as shown in FIG. 12, to form an electromagnetic device. The core Ux is regulated and held by the guidelines 15 and 25.

Next, still another structure example for fixing the winding terminals is shown in FIGS. 19 and 20.
Shows a structure in which the cylindrical bobbin B and the collar 30 are integrated. FIG. 19 shows the front side structure, and FIG. 20 shows the back side structure. The brim 30 is provided with guidelines 34 and 35 for fixing the winding coil, and a through hole 31 is provided at the center. A fitting portion 36 is provided at the end of the cylindrical bobbin B. Fitting portion 36 of cylindrical bobbin B
Is fitted into the through hole 31 of the other brim 30. Mating part 3
A groove 32 is provided on the outer peripheral surface of the groove 6.
Is joined to the protrusion 33 provided on the inner peripheral surface of the through hole 31. As shown in FIG. 18, the winding coil N is arranged on the cylindrical bobbin B, and the brim 30 is connected according to the number of divisions. Finally, the brim 20 shown in FIG. To connect. The winding coil N is fixed by the guide lines 34, 35 of the collar 30 and the guide lines 24, 25 of the collar 20. The collars 30 are fitted with the protrusions 33 and the grooves 32, and the guidelines 35 are also fitted with each other.
0 is fitted with the projections 33 and 23 in the groove 32, and the brim 3
The guide line 35 of 0 and the guide line 25 of the collar 20 are fitted together. As a result, the connected coils are integrated, and the winding coil 11 is casing by the guideline 35, and the winding coil portion, that is, the bobbin B and the collar 3 are formed.
The gap between 0 and 20 and the guidelines 35 and 25 can be filled with an insulating resin. The coil thus integrated has a core Ux inserted therein to form an electromagnetic device, as shown in FIG. The core Ux is based on the guidelines 35 and 2
It is regulated by 5.

Next, another structural example for fixing the winding terminals is shown in FIGS. 23 and 24 show a structure in which the cylindrical bobbin B and the collar 40 are integrally molded.
FIG. 23 shows the structure on the front side and FIG. 24 shows the structure on the back side. The cylindrical bobbin B has a fitting portion 46 at the end. The collar 40 is provided with a through hole 41 at the center thereof and a guide line 45 on the periphery. As shown in FIG. 24, a groove 47 for drawing out the winding wire is provided on the back surface side of the collar 40. 25 and 26 show the structure of the collar 50 used at the end. FIG. 25 shows the front side structure, and FIG. 26 shows the back side structure. The brim 50 includes a guideline 55, a groove 57 for drawing out the winding wire, and a through hole 51.
And a groove 58 that joins with the fitting portion 46 shown in FIGS. 23 and 24. Cylindrical bobbin B having a collar 40
In FIG. 22, a winding coil Nc is arranged in the. The outer diameter of the winding coil Nc is an outer diameter that can pass through the through hole 11 of the collar 10 shown in FIGS. 14 and 15. As shown in FIG. 22, the inner winding coil Nc is inserted into the outer coil to which the winding coil N is connected, and the collar 50 is fitted to the end of the bobbin B that has penetrated.
At this time, the winding coil Nc is fixed in the groove 47 of the collar 40 and the groove 57 of the collar 50. The collar 40 and the outer winding coil N are the guideline 45 of the collar 40 and the collar 10
The guide lines 14 and 15 held by are fitted and joined. Similarly, the brim 50 and the outer winding coil N are joined by fitting the guide line 55 of the brim 50 and the guide lines 24 and 25 of the brim 20. This allows
The inner winding coil Nc and the outer winding coil N have a double winding structure, and all these coils are integrated. Further, the double coil integrated in this way can be arranged with the core Ux regulated and held by the guide lines 45 and 55, as shown in FIG. In this example, the coil of FIG. 12 is used as the outer winding coil N to form a double coil, but of course the coil of FIG. 17 may be used. In addition, if the length of the bobbin B of the collar 40 is adjusted according to the number of connections, it is possible to form a double coil with any number of split coils.

Next, FIGS. 27 and 28 show an example of the rectangular wire pin terminal 6. The pin terminal 6 has a plate-like metal fitting 7 on the pin, supports the rectangular wire 8 so as to be sandwiched as shown in the drawing, and is joined by soldering. As a result, the rectangular wire terminal is not bent, and the joint does not become bulky or large.

Next, FIGS. 29 and 30 show another example of the rectangular wire pin terminal 6. The pin terminal 6 has a beam-shaped metal fitting 9 protruding perpendicularly to the pin, and as shown in the figure, the rectangular wire 8 is bent by using the beam-shaped metal fitting 9 as a fulcrum to connect with the pin.
Join by soldering. By using the pin terminal 6 having such a structure, the rectangular wire terminal is not twisted and is not distorted, and the joint portion is neither bulky nor large.

[0022]

According to the invention of claim 1, a C type core and an I
The mold cores are contacted with each other, with gaps at both ends of the I-shaped core,
A pulse transformer using a CI core that forms a magnetic path, a primary winding is arranged in the center of the I-shaped core, and a secondary winding is divided into two and arranged on both sides of the primary winding. Since there is a gap at both ends of the I-shaped core, there is little leakage flux, there is little interlinkage of the magnetic flux to the coil portion, it is possible to suppress the temperature rise of the coil portion, and suppress the influence on other parts and the generation of noise. In addition, by dividing the winding coil, it is possible to improve the withstand voltage performance, reduce the winding capacitance, and improve the pulse transfer characteristic. Then, place the primary winding in the center of the I-shaped core. By arranging, the coupling ratio of the primary and secondary windings is increased, and the pulse transfer characteristics are further improved,
The pulse peak value can be increased. Further, the same effect can be obtained when the 0-type core is used instead of the C-type core as in the invention of claim 2. Further, according to the invention of claim 3 or 4, there is an advantage that productivity can be improved by split winding only by connecting a plurality of winding coils.
Moreover, there is an effect that the insulation performance can be maintained. Next, according to the invention of claim 5, there is an advantage that the position of the winding terminal of the vertically wound coil of the ultra-thin rectangular wire is fixed and the productivity is improved. According to the invention of claim 6,
The flat wire pin terminal has an effect that the winding can be joined without being distorted or bulky.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of the invention of claim 1;

FIG. 2 is an exploded perspective view of an embodiment of the invention of claim 1;

FIG. 3 is a sectional view of an embodiment of the invention of claim 2;

FIG. 4 is a cross-sectional view showing the structure of a transformer used for explaining the operation of the present invention.

FIG. 5 is a diagram showing characteristics of a transformer used for explaining the operation of the present invention.

FIG. 6 is a diagram showing magnetic flux distributions of various conventional cores.

FIG. 7 is a perspective view showing a conventional bobbin and a coil.

FIG. 8 is an exploded perspective view of a conventional electromagnetic device.

FIG. 9 is an exploded perspective view of an embodiment of the invention of claim 3;

FIG. 10 is an exploded perspective view of a coil used in an embodiment of the invention of claim 3;

FIG. 11 is a perspective view of a bobbin and a collar used in an embodiment of the invention of claim 3;

FIG. 12 is an exploded perspective view of the first embodiment of the invention of claim 4;

FIG. 13 is an exploded perspective view of a coil used in the first embodiment of the invention of claim 4;

FIG. 14 is a front perspective view of a collar used in the first embodiment of the invention of claim 4;

FIG. 15 is a perspective view of the back side of the collar used in the first embodiment of the invention of claim 4;

FIG. 16 is a perspective view of another collar used in the first embodiment of the invention of claim 4;

FIG. 17 is an exploded perspective view of a second embodiment of the invention of claim 4;

FIG. 18 is an exploded perspective view of a coil used in a second embodiment of the invention of claim 4;

FIG. 19 is a front perspective view of a collar used in the second embodiment of the invention of claim 4;

FIG. 20 is a perspective view of the back side of the collar used in the second embodiment of the invention of claim 4;

FIG. 21 is an exploded perspective view of a third embodiment of the invention of claim 4;

22 is an exploded perspective view of a coil used in a third embodiment of the invention of claim 4. FIG.

FIG. 23 is a perspective view of the front side of the collar used in the third embodiment of the invention of claim 4;

FIG. 24 is a perspective view of the back side of the collar used in the third embodiment of the invention of claim 4;

FIG. 25 is a front perspective view of another collar used in the third embodiment of the invention of claim 4;

FIG. 26 is a perspective view of the back side of another collar used in the third embodiment of the invention of claim 4;

FIG. 27 is a perspective view showing an overall configuration of a first embodiment of the invention as claimed in claim 6;

FIG. 28 is a perspective view showing a main structure of a first embodiment of the invention according to claim 6;

FIG. 29 is a perspective view showing an overall configuration of a second embodiment of the invention as claimed in claim 6;

FIG. 30 is a perspective view showing a main structure of a second embodiment of the invention as claimed in claim 6;

FIG. 31 is a cross-sectional view of an electromagnetic device using various conventional cores.

FIG. 32 is a cross-sectional view of a transformer using a conventional CI core.

FIG. 33 is a cross-sectional view of a transformer using a conventional UU core.

FIG. 34 is a sectional view of a transformer using a conventional EI core.

FIG. 35 is a cross-sectional view of a transformer using a conventional CI core.

[Explanation of symbols]

 G Gap Cx C type core Ix I type core N1 primary winding N2 secondary winding

Claims (6)

[Claims] 1. A transformer using a CI type core, wherein a C type core and an I type core are in contact with each other and a gap is provided at both ends of the I type core to form a magnetic path.
An electromagnetic device characterized in that the secondary winding is divided and wound, the primary winding is arranged in the center of the I-shaped core, and the secondary winding is divided into two parts on both sides thereof. 2. A transformer using an OI-type core, which comprises an O-type core and an I-type core that are in contact with each other and gaps are provided at both ends of the I-type core to form a magnetic path.
An electromagnetic device characterized in that the secondary winding is divided and wound, the primary winding is arranged in the center of the I-shaped core, and the secondary winding is divided into two parts on both sides thereof. 3. An electromagnetic device comprising at least one collar having a guideline for fixing a winding and fitted into a cylindrical bobbin, and comprising a split winding coil in which the winding and the collar and the bobbin are integrated. 4. An electromagnetic device comprising a split winding coil in which at least two cylindrical bobbins and collars having guide lines for fixing the windings are arranged and integrated so that at least two of them are connected and integrated. 5. The electromagnetic device according to claim 3 or 4, wherein the winding coil is a rectangular wire vertical winding solenoid coil. 6. The electromagnetic device according to claim 5, wherein the pin terminal on which the flat wire is mounted has a plate-shaped metal that supports the flat wire so as to sandwich the flat wire.