JPH02194507A - Small-sized electric winding component - Google Patents

Abstract

PURPOSE:To prevent a winding part from being collapsed without enlarging the overall shape and to enhance a withstand voltage and efficiency by a method wherein a thickness of the winding part of a bobbin is increased gradually along a cylinder axis direction. CONSTITUTION:In an electrically insulating bobbin 12, a central leg of an E-shaped core is installed at the inside of a cylindrical winding part; a thickness of a winding part 12a is t1 at a rise part of a guard 12b; the thickness is increased gradually toward a guard 12c in an outer periphery direction of the winding part 12a and is formed to be t2 at a rise part of the guard 12c in order to have an insulation withstand voltage according to an induced voltage at each winding part of a secondary coil 13. This winding is wound in such a way that it climbs a slope of the winding part 12a; a wire material on an outer periphery face of the winding part 12a does not slip and fall; it is possible to prevent a winding from being collapsed. A distance between the secondary coil 13 and a primary coil 14 is made large in such a way that a winding starting end of the secondary coil 13 is a low voltage and that its winding terminating end is a high voltage; in addition, since a thickness of the bobbin winding part 12a is large at a high-voltage part of the secondary coil 13, a part between the secondary coil 13 and the core can be surely electrically insulated.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a small electrical winding component 1, such as a small transformer, choke coil, etc.

``Prior Art J'' Small electric wire-wound parts are widely used in electrical equipment such as televisions, videos, and tape recorders, and in flashlights for cameras.

FIG. 7 is a simplified sectional view of a small transformer as this type of small electric winding component.

As shown in the figure, this small transformer 30 has a ferrite core 31 housed in a bobbin 32 having flanges 32b and 32c.
The winding portion 32a has a step-up transformer structure in which a primary coil 33 on the input side and a secondary coil 34 on the output side are wound.

That is, the secondary coil 34 is wound around the outer peripheral surface of the winding portion 32a of the bobbin 32 with a wire material having a small diameter many times, and the primary coil 33 is wound around the outer peripheral surface of the secondary coil 34 with a thick wire material several times. There is a line.

The above-mentioned secondary coil 33 and secondary coil 3 are connected to the coil terminal 35.
The winding start end and winding end of No. 4 are connected.

Insulating coatings 36a and 36b are applied to the outer peripheral surfaces of the secondary coil 34 and the primary coil 33, respectively, and an insulating coating 36c is applied to the gap on the right side of the secondary coil 33.

Although there are various winding methods for winding the secondary coil 34, a so-called diagonal overlap winding method is suitable as a winding method that increases withstand voltage and efficiency.

FIG. 8 is an explanatory diagram showing a winding method when the secondary coil 34 of the small transformer 30 shown in FIG. 7 is subjected to diagonal overlapping winding.

The secondary coil 34 is a first winding portion 34 wound with a single wire.
a, a second winding part 34b, and a third winding part 34C.

As shown in the figure, in the first winding part 34a, there is a three-turn winding pitch forward path in which the winding starts from the lowest inner surface of the collar 32b and is wound in the direction of the collar 32c, and then the winding pitch is wound in the R32b direction on top of this forward path. The winding process a is performed by a return path of 3 turns in which the winding pitch is advanced, and then 3 turns are performed on the winding in the winding process a, and 3 turns are placed on the winding part 32a. A 6-turn winding is wound, and the winding pitch goes forward in the direction of the tsuba 32c, and the 6-turn winding is wound around -L of this winding, and the winding is wound on the tsuba 3.
The winding process a2 is performed using the 6 turns of winding wire whose winding pitch is returned in the direction 2b.

Similarly, each time the winding process is repeated, three turns of winding are added to the forward and backward passes 33.

a4, , , , , an winding process is performed.

The first winding portion 3/1a wound in this manner is formed as a triangular cross-sectional layer surrounded by lines connecting the windings Ta, , Tak, and Tan, and the hypotenuse portion thereof is formed by the ferrite core 31.
It has a constant angle θ with respect to the axis of .

In the drawings, each winding process is shown in a stepwise manner for convenience of explanation, but in the actual state of winding, it is formed as a cross-sectional layer with a straight inclined side 34-Q at an angle θ.

The second winding portion 34b is wound so that the winding pitch advances along the oblique side of the triangular cross-sectional layer described above.

That is, the wire is wound along the hypotenuse of the triangular cross-section layer.

The return winding wound from Tan is Tb, and has 3 turns less than the outward winding. Next, the outward path in which the winding pitch advances from the outer periphery of the coil toward the winding portion 32a is the winding portion 32a.
2a, the winding is increased by 3 turns in the direction of the collar 32c. (Tb2 to Tb,) Subsequently, this winding is wound in a backward direction by advancing the winding pitch in the direction of the outer circumference of the coil, but this backward winding has three turns fewer than the outward winding. (Tb.

~Tb4) By advancing the winding pitch in this way, the winding process b
+b, and so on.,b.

, , , , , bn winding steps are sequentially performed to form the second winding portion 34b.

Similarly to the first winding part 34a, the third winding part 34c has winding steps C2, C3, C4, . Each time this is repeated, the winding pitch is reduced by three turns in the forward and backward directions.

However, in this third winding portion 34c, the lengths of the forward and backward paths are decreased in each winding process from the collar 32c toward 1fJ32b.

The third winding portion 34c wound in this manner is formed as a winding having a triangular cross-section layer as shown in the figure.

"Problem to be Solved by the Invention" The small transformer 30 shown above as an example has a primary coil 3
3, a low voltage is input to the secondary coil 34, and a high voltage is induced in the secondary coil 34. When the induced voltage is output such that the coil Ta at the beginning of winding has a low potential and the coil Tcn at the end of the first winding has a high potential. As the winding progresses to p 32 e, the secondary coil voltage becomes higher.

Coil Ten at low potential, coil T, 3. When outputting an induced voltage by setting the voltage to a high potential, the above is reversed.

As a result, the secondary coil voltage becomes higher as it approaches the collar 32b or 32c, and the winding portion 32 of the bobbin 32 closer to the collar
This induces corona discharge, dielectric breakdown, etc. in a, leading to problems such as electrical leakage accidents due to insulation deterioration, power loss due to heat generation due to corona release, and high frequency noise affecting other electronic circuits. As a countermeasure against this, in addition to providing sufficient insulation between the secondary coil 33 and the secondary coil 34 and keeping the distance between the secondary coil 33 and the high voltage part of the secondary coil 34 as far as possible, The second method is to increase the thickness of the winding portion 32a of r32.

However, increasing the thickness of the winding portion 32a of the bobbin 32 beyond the current thickness increases the overall shape of the small transformer 3o, which is not preferable. In addition, although the diagonal overlapping winding of the above-mentioned small transformer 30 considerably improves the winding surface deviation, the wire may still slip on the surface of the winding portion 32a and become misaligned, or the wire may not get on the lower layer winding. It is difficult to reliably prevent windings from slipping and becoming damaged.

Due to this winding part misalignment, there was a risk that the high voltage portion of the secondary coil 34 would approach the low voltage portion of the coil, causing corona discharge or the like.

Accordingly, an object of the present invention is to develop a small electric winding component that does not increase the overall shape of the small electric wire component, has less risk of winding part warping, and has improved withstand voltage and efficiency.

``Means for Solving the Problems'' In order to achieve the above-mentioned objects, the present invention provides a bobbin having a cylindrical winding portion in which a core is housed, and a predetermined winding applied to the winding portion of this bobbin. The present invention proposes a small electrical winding component, characterized in that the thickness of the winding portion of the bobbin is gradually increased along the axial direction of the cylinder.

"Function" Since the thickness of the winding portion of the bobbin is increased sequentially along the cylinder axis direction, the dielectric strength voltage is increased sequentially from one side of the winding portion to the other.

Therefore, the arrangement of the coils is determined according to the dielectric strength voltage at each position of the winding portion of the bobbin so that each voltage of the coil does not exceed, and there is no waste in the thickness of the winding portion.

On the other hand, if the thickness of the winding section is gradually increased in the direction of the cylinder axis so that the outer circumferential surface of the winding section overhangs the inner circumferential surface of the winding section parallel to the axis of the core, Since the center of gravity of the wound wire of the winding section is slightly inclined toward the winding start end, there is no risk of the winding section becoming skewed.

"Example" Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view of a small transformer showing a first embodiment of the present invention, and FIG. 2 is a cross-sectional plan view of the transformer.

In these figures, lla and llb are E-shaped cores of the same shape made of ferrite material, and 12 is the above-mentioned E-shaped core in the cylindrical winding part.
13 is a secondary coil, 14 is a secondary coil, 158 to 15e are insulation coatings, and 16 is a terminal pin implanted in the lower part of the bobbin 12. The pin 16 is connected to the secondary coil 14. The winding start end and winding end of the secondary coil 13 are each fixedly attached.

The bobbin 12 has a winding portion 12a serving as a winding core and n1 at both ends of the winding portion 12a.
As shown in FIG. 2, the two-winding part 1.2a consists of 2b and 12c, and the inner peripheral surface parallel to the axis of the core is 112b and 12c.
The winding part 12 is perpendicular to c and the outer peripheral surface extends outward.
The wall thickness of 912a increases at a constant rate from one 912b to the other flange 12c, and the outer circumferential surface thereof is formed with a constant slope.

That is, the wall thickness of the fifth winding part 12a is tl at the rising part of the flange 12b, but the thickness is increased by one order as it goes toward the outer circumferential surface of the first winding part 12a toward 01.2 c. The part is set to t2, and the distance between the brim is a constant slope.

In this way, the thickness of the winding portion 12a is formed to have a dielectric strength voltage corresponding to the induced voltage of each winding portion of the secondary coil 13.

The secondary coil 13 is the winding portion 12a of the bobbin 12 described above.
A single thin wire is wound many times around the outer circumferential surface of the wire starting from the side of the collar 12b, and an insulating coating 15a is applied to the outer circumferential surface of the wire.

29, the -order coil 14 is the secondary coil 13
A single thick wire is wound several times on an insulating coating 15a applied to the outer peripheral surface.

An insulating coating 15b is applied to the outer peripheral surface of the secondary coil 14, and an insulating coating 15b is applied to the right cap of the secondary coil 14.
15C and fill in the gap.

The winding of the secondary coil 13 is carried out by the conventional winding method shown in FIG.

According to this winding method, first, in the first winding part, one winding pitch is advanced with the inner surface of the rising part of the crocodile 12b as the winding start end, and the winding process with the same number of windings in the forward and backward passes is performed on one RL2b.
From there, the winding is repeated while increasing the number of windings in a fixed number of turns toward the other collar 12c.

Subsequently, in the second winding section, winding is performed by sequentially repeating a winding process in which the number of windings is decreased by a fixed number of windings in the backward direction with respect to the forward direction.

In the third and final winding section, the winding process in which the number of windings is the same in the forward and backward passes is performed by winding the windings while sequentially decreasing the number of windings from the other collar 12c toward the one collar 12b by a constant number of windings. , The winding is terminated at the upper layer of the winding near the collar '1.2 c.

In addition, the secondary coil 13 can also be comprised by a 1st winding part and a 3rd winding part.

As described above, in this winding method, the wire is wound so as to ascend the slope of the winding portion 12a, so that the wire on the outer circumferential surface of the winding portion 12a may slip in the direction of the collar 12c and become misaligned, or the wire may become misaligned. It prevents the windings from slipping and falling off the lower layer windings, and prevents the windings from coming loose.

In addition, the secondary coil 13 is configured such that the winding start end is a low voltage and the winding end is a high voltage, so that it is separated from the secondary coil 14, and the high voltage part of the secondary coil 13 is Since the bobbin winding portion 12a has a large wall thickness, electrical insulation between the secondary coil 13 and the core is ensured.

FIG. 3 is a simplified cross-sectional plan view similar to FIG. 2, showing a second embodiment of the present invention.

The bobbin 12 of this embodiment has the same structure as that shown in FIG. 2, and the method of winding the secondary coil 13 is also the same as that shown in FIG.

However, the laminated surface on the outer periphery of the secondary coil 13 is the winding part 12a.
The wires are wound so that they are approximately parallel to the outer peripheral surface of the wire. When the secondary coil 13 is formed in this way, the winding of the secondary coil 13 is efficient and the possibility of winding part deviation is further reduced.

FIG. 4 is a simplified cross-sectional plan view similar to FIG. 2 showing a third embodiment of the present invention.

In this embodiment, the secondary coil 13 is wound so that the height of the laminated surface on the outer periphery thereof is gradually decreased toward the collar 12e.

Then, the laminated surface of the outer periphery of the secondary coil 13 and the primary coil 1
4 is filled with an insulating member 15c.

If such a configuration is implemented, the high voltage winding portion of the secondary coil 13 can be formed near the collar 12c, and the distance between this portion and the primary coil 14 can be increased.

This is effective in reducing electrical leakage accidents.

FIG. 5 is a simplified cross-sectional plan view similar to FIG. 2 showing a fourth embodiment of the present invention.

The transformer of this embodiment has an E-shaped core 17a and a ■-shaped core 17b.
It is composed of an iron core 2 bobbin 18, a secondary coil 13, a secondary coil 14, etc.

As shown in the figure, the bobbin] 8 is connected from the collar 18b to r418c so that the thickness of the winding part i8a extends in the direction of the inner peripheral surface.
It is formed with a constant slope.

Further, the central leg of the E-shaped core 17a is formed to become thinner toward the tip of the central leg, corresponding to the shape of the inner circumferential surface of the winding portion 18a.

Even in such a configuration, the winding portion 18a of the bobbin 18
The same thickness as in the first to third embodiments is ensured, and the winding portion 18a can have a dielectric strength voltage corresponding to the high voltage portion of the secondary coil 13 at each location.

FIG. 6 is a simplified sectional view showing a fifth embodiment of the present invention implemented as a section-wound transformer.

As shown in the figure, the bobbin 20 with the core 19 inside has a tsuba 20.
Winding portions 20a to 20a divided by b to 20f
4 is formed, and these winding portions 20a□ to 20a4 are connected to the collar 20.
It is formed with a constant inclination so as to protrude in the direction of the outer peripheral surface from b toward the side of the collar 20f.

Further, the winding portions 2081 to 20a4 each include a primary coil 21. Secondary coil 22. A tertiary coil 23 and a quaternary coil 24 are provided, so that the dielectric strength can be obtained sequentially from the -th coil to the quaternary coil.

Although each of the embodiments has been described above, the present invention can be similarly implemented with respect to an electrical winding component that does not include a core.

Further, the single winding method is not limited to the so-called diagonal overlap winding method explained in FIG. 8, but can also be implemented with aligned winding or misaligned winding, and the effects of the present invention can be obtained.

Furthermore, in the embodiments shown in FIGS. 1 to 5, not only the -order and secondary coils but also five other coils may be installed.

"Effects of the Invention" As described above, the present invention makes it possible to sequentially increase the thickness of the winding portion of the bobbin at a constant rate along the axial direction of the cylinder, and to increase the dielectric strength voltage sequentially from one winding portion to the other. be.

Therefore, by arranging the high voltage windings according to the dielectric strength of the winding parts, the thickness of one winding part is not wasted, and the small electrical winding component can be further downsized.

On the other hand, if the above-mentioned thickness of the winding part is formed so as to protrude from the inner peripheral surface of the winding part parallel to the axis of the core, the center of gravity of the wound wire of the winding part can be Since the winding part is slightly tilted toward one of the collars, the winding part is less likely to run out.

In particular, the winding process is repeated in which the above-described winding portion is sequentially increased or decreased in units of a fixed number of turns.

Alternatively, by sequentially repeating the winding process in which the number of windings in the return path is decreased by a certain number of turns relative to the number of turns in the forward path, it is possible to avoid electric leakage accidents due to winding portions.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway perspective view of a small transformer showing a first embodiment of the present invention, FIG. 2 is a simplified cross-sectional plan view of the above-mentioned small transformer, and FIGS. 3 to 5 are other embodiments of the present invention. FIG. 6 is a simplified cross-sectional plan view of a small transformer similar to FIG. 2, showing an example, and FIG.
FIG. 7 is a sectional view showing an embodiment, FIG. 7 is a simplified sectional view of a conventional small transformer, and FIG. 8 is an explanatory diagram showing a method of winding the conventional small transformer shown in FIG. 11a, 1lb---E-type core 12...Bobbin 12a...Winding part 12b, 12c ==Flame 13...Secondary coil 14...-Secondary coil 15a, 15 b, 15 c...=Zetsu Je+covering 3rd
Figure 4

Claims (1)

[Claims] In a bobbin that has a cylindrical winding part that houses a core, and a small electrical winding part that has a predetermined winding applied to the winding part of this bobbin, the thickness of the winding part of the bobbin is adjusted in the direction of the cylinder axis. A small electric winding component characterized by increasing size sequentially along the length.