JPH04127620U - E type core - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent warping and deformation during the molding and firing process, and to prevent leakage even if the bobbin brim is made low in height. [Structure] The E-shaped core 30 includes a central magnetic leg 31, side magnetic legs 32, 32' disposed at both ends of the central magnetic leg 31 with winding gaps 34, 34' interposed therebetween, and a yoke portion 33 connecting one end of the leg 31 and the side magnetic legs 32, 32';
The yoke portion 33 has an E-shaped planar shape in plan view, and the yoke portion 33 is notched near the center magnetic leg 31 from the side magnetic leg 32 to the inner wall of each of the side magnetic legs 32'. A notch 35a is formed, and the yoke notch 35
The central magnetic leg 31 is cut out to form a central magnetic leg notch 35b so that the surface a and the upper surface of the central magnetic leg 31 are on the same plane.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This idea uses materials such as ferrite to be used as winding components in transformers, etc. Regarding the E-shaped core, in more detail, the yoke portion of the core and the core into which the core is incorporated. An electrical short circuit (hereinafter referred to as leak) may occur between the bobbin and the bobbin due to a high potential difference. In addition to suppressing the Regarding an E-shaped core configured to prevent warping from occurring when being shaped. It is.

0002

[Conventional technology]

With the demand for miniaturization of various electronic devices, winding components such as transformers are also becoming smaller. There is a strong demand for molding, and there is a particularly strong demand for lower height.

0003 In response to these needs, the E-shaped core 10 shown in FIGS. 16 to 18 has been proposed. The E-shaped core 10 has a central magnetic leg 11 and winding gaps at both ends of the central magnetic leg 11. 14, 14', and the center magnetic leg 1. 1 and the yoke part 13 connecting one end of the side magnetic legs 12, 12', It is configured to have an E-shape.

0004 Furthermore, the E-shaped core 10 has a width similar to that of the side magnetic legs 12, 12' and the yoke portion 13. The height of the central magnetic leg 11 is the same as that of the side magnetic legs 12, 12' and The central magnetic leg notch 15 is provided so as to be approximately 1/2 of the height of the yoke portion 13, and The width of the central magnetic leg 11 is made approximately four times the width of the side magnetic legs 12, 12' and the yoke portion 13. There is.

[0005] Therefore, the height of the center magnetic leg 11 is reduced by an amount corresponding to the center magnetic leg notch 15. This contributes to lowering the height of the wire-wound parts into which it is incorporated.

[0006] The E-shaped core 10 is an E-shaped core having a line-symmetrical shape or an I-shaped core having a planar view shape. In addition to being combined with an I-shaped core having a By being incorporated into the bobbin 16 having the winding portion 19 with a wire, a transformer etc. constitutes the winding parts of.

[0007] Note that the bobbin 16 has a flange 17 that serves as a winding stop frame and has a pincushion-shaped side view shape. It is provided at both ends so as to have a wire winding line at the bottom of the collar part The base end 18 has a frame terminal 18a implanted therein for electrical connection with the outside. It is constituted by providing.

[0008] Inspired by the E-shaped core 10, an E-shaped core 20 shown in FIGS. 20 to 22 is also available. has been proposed, and the E-shaped core 20 includes a central magnetic leg 21 and both ends of the central magnetic leg 21. side magnetic legs 22, 22' arranged with winding gaps 24, 24' interposed therebetween; A structure consisting of a yoke portion 23 that connects one end of the center magnetic leg 21 and the side magnetic legs 22, 22'. has been completed.

[0009] Furthermore, the E-shaped core 20 has the height of the central magnetic leg 21 lower than that of the side magnetic legs 22, 22'. The center magnetic leg notch 25b is provided so as to be about 1/2 of the height, and the center magnetic leg 2 1 is approximately four times the width of the side magnetic legs 22, 22', and the height of the yoke portion 23 is set to the center magnetic field. The yoke notch 25a is provided so as to be slightly higher than the height of the leg 21, and The width of the yoke portion 23 is made slightly larger than the width of the side magnetic legs 22, 22'.

0010 The E-shaped core 20 is also combined with other cores and incorporated into the bobbin. A similar effect can be achieved by

[0011] In addition, in modeling the E-shaped core 10 and the E-shaped core 20, for example, A dry double-acting press machine is used to make the ferrite material powder have an E-shape in plan view. An appropriate method is to mold the material using a sintering method, and then sinter it at a predetermined sintering temperature using a sintering furnace. It is commonly used.

0012

[Problem that the idea aims to solve]

However, the height of the conventional center magnetic leg is about 1 of the height of the side magnetic legs and the yoke part. /2 In the E-type core with a central magnetic leg notch, the winding parts, etc. However, as shown in Figure 19, the transformer is incorporated into the bobbin. When winding parts such as Since the winding part is adjacent to the winding part, the collar part is made higher than the top surface of the E-shaped core and the winding part. Otherwise, leakage due to potential difference between the yoke part and the winding part is likely to occur, and this Therefore, it is not possible to reduce the height of the flange, and as a result, it is difficult to reduce the height of the winding parts. There was a problem that it was a hindrance.

[0013] In addition, in order to deal with this, the height of the conventional center magnetic leg is higher than that of the side magnetic legs and the yoke part. A central magnetic leg notch is provided at approximately 1/2 of the height, and the bobbin Adjust the yoke so that the height of the yoke part corresponding to the hip part is slightly higher than the height of the center magnetic leg. For the E-type core with a notch, the ferrite material powder is applied to a dry double-acting press. It is manufactured by molding it into the above shape using a steel and firing it, but the yoke part and center magnetic leg As shown in Figure 23, during the dry molding or firing process, However, if distortion occurs due to internal latent stress, warping deformation Z tends to occur in the yoke. There was a problem.

[0014] Therefore, the gist of the present invention is to solve the above-mentioned conventional problems and prevent warpage from occurring. We provide an E-shaped core that is small and does not easily leak even if the bobbin brim is made low. There are many things.

[0015]

[Means to solve the problem]

In order to achieve the above purpose, this invention consists of a central magnetic leg and a The E-shaped core consists of magnetic legs on both sides and a yoke that connects one end of each magnetic leg. The height of the part of the yoke near the center magnetic leg and the center magnetic leg is The height of the yoke portion is lower than that of the magnetic legs on both sides, and the height of the remaining portion of the yoke portion is made lower than the height of the magnetic legs on both sides. The above objective is achieved by making the height equal to that of the magnetic leg on the opposite side.

[0016]

[Effect]

In the present invention, the part of the yoke near the center magnetic leg and the center magnetic leg are By forming the height lower than the magnetic legs on both sides, the winding portion and the yoke portion are A gap is provided between the two, making it difficult for leaks to occur.

[0017] Furthermore, the height of the remaining portion of the yoke portion should be made equal to the height of the side magnetic leg. This reduces the influence of latent distortion inside the yoke during molding and firing. It is hard to scratch and does not warp or deform.

[0018]

【Example】

Examples of the E-shaped core according to the present invention will be explained in detail based on the drawings. .

[0019] Fig. 1 is a perspective view showing an embodiment of an E-shaped core according to the present invention, and Fig. 2 is an E-shaped core of the same embodiment. A plan view showing the core, FIG. 3 is a sectional view showing the A1-A1' cross section of the same example, and FIG. 4 is a cross-sectional view showing the same example. A sectional view showing the B1-B1′ cross section of the example, FIG. 5 shows the winding part of the E-shaped core of the same example. Figure 6 is a cross-sectional view showing a part of a winding component assembled into a bobbin. A perspective view showing another embodiment of the E-shaped core according to the invention, FIG. 7 shows the E-shaped core of the same embodiment. FIG. 8 is a sectional view showing the A2-A2′ section of the same embodiment, and FIG. 9 is a cross-sectional view of the same embodiment. FIG. 10 is a cross-sectional view showing the B2-B2′ cross section of the same example, and FIG. Figure 11 is a cross-sectional view showing a part of a winding component assembled into a bobbin. A perspective view showing another embodiment of the E-shaped core according to the proposal, FIG. 12 shows the E-shaped core of the same embodiment. FIG. 13 is a cross-sectional view showing another embodiment of the E-shaped core according to the present invention, FIG. 4 is a sectional view showing another embodiment of the E-shaped core according to the present invention, and FIG. 15 is a cross-sectional view showing another embodiment of the E-shaped core according to the present invention. FIG. 3 is a sectional view showing another example of the E-shaped core.

[0020] As shown in FIGS. 1 to 4, the E-shaped core 30 includes a central magnetic leg 31 and a central magnetic leg 3. Side magnetic legs 32, 32' are arranged at both ends of 1 with winding gaps 34, 34' interposed therebetween. and a yoke portion 33 that connects one end of the central magnetic leg 31 and the side magnetic legs 32, 32'. , is configured to have an E-shaped plan view shape.

[0021] Further, in the E-shaped core 30, the yoke portion 33 is closer to the center magnetic leg 31 than the center magnetic leg 31. A yoke notch 35 is cut out from the side magnetic leg 32 to the inner wall of each side magnetic leg 32'. a is formed, and the surface of the yoke notch 35a and the upper surface of the central magnetic leg 31 are the same. The central magnetic leg 31 is cut out to form a central magnetic leg notch 35b so as to form one surface. It is.

[0022] To be more specific, the yoke notch 35a has a notch width X1 shown in FIG. 3 and a width X1 shown in FIG. The notch has a vertical width Y1 shown in FIG.

[0023] As a result, the height of the remaining portion of the yoke portion 33 in which the yoke cutout portion 35a is formed is , the height is the same as that of the side magnetic legs 32, 32', and the yoke notch 35a is formed. Regarding the height of the yoke part 33 and the center magnetic leg 31, the height of the remaining part and the side magnetic leg 3 is as follows. 2,32'.

[0024] Preferably, in the E-shaped core 30, the height of the central magnetic leg 31 is adjusted to the side. The yoke is approximately 1/2 of the height of the magnetic legs 32, 32' and the yoke part 33. A notch 35a and a central magnetic leg notch 35b are formed, and a cutout of the central magnetic leg 31 is formed. so that the area is twice the cross-sectional area of each of the side magnetic legs 32, 32' and the yoke part 33. , the width of the central magnetic leg 31 is made approximately four times the width of the side magnetic legs 22, 22' and the yoke portion 33. ing.

[0025] The E-shaped core 30 configured as described above is an E-shaped core having a line-symmetrical shape or By combining with an I-shaped core having an I-shape in plan view, the shape in plan view becomes In addition to forming a sun-shaped magnetic path, a winding was placed in the center as shown in Figure 5. By being incorporated into the bobbin 36 having the winding part 39, the winding part of transformer parts, etc. make up the product.

[0026] The bobbin 36 is arranged so that the collar portion 37, which serves as a winding stop frame, is sandwiched between the winding portions. It has a pincushion-shaped side view shape, and wire winding is applied to both bottoms of the collar portion 37. A base end portion where a frame terminal 38a is implanted for electrical connection with the outside as well as electrical connection with the outside. 38 is provided.

[0027] Further, one of the brim portions 37 of the bobbin 36 has a portion cut out at the upper portion. A notch 37a is formed.

[0028] Therefore, according to the E-shaped core 30, the yoke is cut on the central magnetic leg 31 side of the yoke portion 33. Since the cutout 35a is formed, when assembled into the bobbin 36, the yoke cutout The cutout portion 35a acts as a gap separating the yoke portion 33 and the winding portion 39. This prevents the occurrence of leakage due to a high potential difference between the yoke portion 33 and the winding portion 39. be able to.

[0029] That is, the yoke part of the conventional E-shaped core and the winding part of the bobbin are adjacent to each other through the collar part. In this case, it is not necessary to make the flange higher than the top surface of the E-shaped core and the winding part. Therefore, it is possible to overcome the problem of lowering the height of the winding component due to the protrusion of the flange. .

[0030] Further, the yoke notch 35a of the E-shaped core 30 is connected to the yoke part 33 of the bobbin 36. By acting as a gap with the winding part 39, one collar part 3 of the bobbin 36 Even if a part of 7 is cut out to form the collar notch 37a, the occurrence of the leak can be prevented. Therefore, when the E-shaped core 30 is incorporated into a winding component such as a transformer, the In this case, the notch 37a can be used as an index for visually recognizing the direction (polarity) of the winding component. Become.

[0031] Furthermore, the ferrite material powder is molded into an E-shape using a dry double-acting press. It is manufactured by firing, but the height of the conventional center magnetic leg and yoke part is about 1/2 of the height of the side magnetic leg. The E-shaped core formed in Distortion, that is, warping deformation occurs due to the presence of stress, but in the E-shaped core 30 according to the present invention, The remaining portion of the yoke portion 33 excluding the yoke notch 35a is the side magnetic leg 32, 3. 2', and is configured to connect them. To prevent warping and deformation due to the influence of latent stress in each process. I can do that.

[0032] Next, other embodiments of the E-shaped core according to the present invention will be described with reference to FIGS. 6 to 9. I will explain further.

[0033] Note that in this example, the same parts and parts with the same functions as in the previous example were used. are given the same reference numerals and the description thereof will be omitted.

[0034] In the E-shaped core 40, the width of the yoke portion 33 closer to the center magnetic leg 31 is approximately the same as the width of the center magnetic leg 31. A yoke notch 45a is formed by notching over the same width, and the yoke is The center magnetic leg 31 is placed so that the surface of the notch 45a and the upper surface of the center magnetic leg 31 are on the same plane. is notched to form a central magnetic leg notch 45b.

[0035] That is, the yoke notch 45a has a notch width X2 shown in FIG. 8 and a width X2 shown in FIG. The notch has a vertical width Y2.

[0036] The state in which the E-shaped core 40 configured as described above is assembled into the bobbin 36 is as follows. As shown in FIG.

[0037] Therefore, this embodiment can also achieve the same effect as the previous embodiment. .

[0038] Next, other embodiments of the E-shaped core according to the present invention will be described with reference to FIGS. 11 and 12. This is explained by:

[0039] Note that in this example, the same parts and parts with the same functions as in the previous example were used. are given the same reference numerals and the description thereof will be omitted.

[0040] In the E-shaped core 50, the side of the yoke portion 33 closer to the center magnetic leg 31 is located at the winding gaps 34, 34'. A yoke cutout portion 55a is formed by cutting out approximately the center portions of the yoke cutout portion 55a. The center so that the surface of the yoke notch 55a and the upper surface of the center magnetic leg 31 are on the same plane. The magnetic leg 31 is notched to form a central magnetic leg notch 55b.

[0041] In this embodiment as well, the same effects as in the previous embodiment can be achieved.

[0042] Next, please refer to FIGS. 13 to 15 for examples of the E-shaped core according to the present invention. This will be explained in order.

[0043] Note that in this example, the same parts and parts with the same functions as in the previous example were used. are given the same reference numerals and the description thereof will be omitted.

[0044] The E-shaped core 60 shown in FIG. 13 has an inclination toward the center magnetic leg 31 side of the yoke portion 33. A notch 65 is formed.

[0045] Furthermore, the E-shaped core 70 shown in FIG. 14 is similarly formed with a notch 75 having one step. It is something that was given.

[0046] Furthermore, the E-shaped core 80 shown in FIG. ' are formed respectively.

[0047] In each of the above embodiments, the same effects as in the previous embodiments can be achieved.

[0048]

[Effect of the idea]

Since the E-type core according to the present invention is configured as described above, the following description will be made. It has a similar effect.

[0049] (1) The height of the part of the yoke near the center magnetic leg and the center magnetic leg Since the E-shaped core is constructed by forming the E-shaped core lower than the magnetic legs on both sides, A gap is provided between the winding part of the bobbin into which the E-shaped core is incorporated and the yoke part of the E-shaped core. It is possible to prevent leaks from occurring between the winding part and the yoke part. In both cases, the flange of the bobbin is made higher than the upper surface of the E-shaped core and the winding part to prevent the leakage. Since it is not necessary to prevent It has the excellent effect of being able to be worn.

[0050] (2) The height of the remaining portion of the yoke portion shall be equal to the height of the side magnetic leg. Since the E-type core is constructed by In each step of molding into an E-shape using a press and then firing in a firing furnace, It is said that it is possible to prevent distortion, that is, warp deformation due to internal latent stress that occurs when Has excellent effects.

[Brief explanation of drawings]

[Fig. 1] A perspective view showing an example of an E-shaped core according to the present invention.

[Figure 2] A plan view showing the E-shaped core of the same example.

[Figure 3] Cross-sectional view showing the A1-A1' cross section of the same example

[Figure 4] Cross-sectional view showing the B1-B1' cross section of the same example

[Fig. 5] A cross-sectional view showing a part of a winding component constructed by incorporating the E-shaped core of the same example into a bobbin having a winding part.

[Fig. 6] A perspective view showing another embodiment of the E-shaped core according to the present invention.

[Fig. 7] Plan view showing the E-shaped core of the same example.

[Figure 8] Cross-sectional view showing the A2-A2' cross section of the same example

[Figure 9] Cross-sectional view showing the B2-B2' cross section of the same example

[Fig. 10] A cross-sectional view showing a part of the E-shaped core of the same example assembled into a bobbin having a winding part to form a winding component.

[Fig. 11] A perspective view showing another embodiment of the E-shaped core according to the present invention.

[Fig. 12] Plan view showing the E-shaped core of the same example.

[Fig. 13] Cross-sectional view showing another embodiment of the E-shaped core according to the present invention

[Fig. 14] A sectional view showing another embodiment of the E-shaped core according to the present invention.

[Fig. 15] A sectional view showing another embodiment of the E-shaped core according to the present invention.

[Figure 16] Plan view showing a conventional E-shaped core

[Figure 17] Cross-sectional view showing the A3-A3' cross section of a conventional E-shaped core

[Figure 18] Cross-sectional view showing the B3-B3' cross section of a conventional E-shaped core

[Fig. 19] A cross-sectional view showing a part of a conventional E-shaped core assembled into a bobbin having a wire portion to form a winding component.

[Figure 20] Plan view showing another conventional E-shaped core

[Figure 21] Cross-sectional view showing the A4-A4' cross section of another conventional E-shaped core

[Fig. 22] Cross-sectional view showing the B4-B4' cross section of another conventional E-shaped core

[Figure 23] Cross-sectional view showing the state of warp deformation of another conventional E-shaped core

[Explanation of symbols]

30 E type core 31 Center magnetic leg 32 Side magnetic leg 33 Yoke part 35a Yoke notch 35b Center magnetic leg notch 36 Bobbin 37 Brim part 37a Brim notch 39 Winding section

Claims (1)

[Scope of utility model registration request] 1. In an E-shaped core consisting of a central magnetic leg, both side magnetic legs disposed on both sides of the central magnetic leg, and a yoke portion connecting one end side of each of these magnetic legs, the yoke portion near the center magnetic leg of the yoke portion. E characterized in that the height of the part and the center magnetic leg is formed lower than the both side magnetic legs, and the height of the remaining part of the yoke part is made equal to the height of the side magnetic legs. shaped core.