JPH0546010U - Inductor - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] To secure the insulation of the lead wire of the coil without the need for troublesome work such as covering a thin insulating coated wire with a resin tube. [Structure] Since an insulating cover member 2 is attached so as to cover the outer peripheral surface of the flange portion 8 on the side where the lead wire 6 of the ferrite magnetic core 1 is implanted and its corner edges, the flange portion 8
When the lead wire 5 of the coil 3 is drawn through the outer peripheral surface of the coil 3, even if a resin tube is not passed through the lead wire 5, the cover member 2 ensures the insulation of the lead wire 5.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an inductor having a coil formed by winding a wire around a ferrite magnetic core formed of a ferrite magnetic material.

[0002]

[Prior Art]

 As shown in FIGS. 5 and 6, the ferrite core 1 used in the inductor is formed of a sintered body of ferrite, and the most general shape thereof is a cylindrical winding core 7 and both ends thereof. And a flange-shaped flange portion 8 that is formed. The ferrite magnetic core 1 is, for example, a Ni-Zn-based soft ferrite raw material powder pressure-molded into a cylindrical shape, the center part of which is cylindrically cut, and a core having a smaller step diameter between the flange parts at both ends. It is obtained by making a drum-shaped molded body having a portion and firing it. Two lead wires 6 are planted on the main surface of one flange portion 8 of the ferrite magnetic core 1, and a conductor wire insulated from the winding core portion 7 is wound to form a coil 3. By pulling out the lead wire 5 of the coil 3 to the end face side of the flange portion 8 and entwining it with the lead wire 6, and further immersing the lead wire 6 in molten solder, the lead wire 5 entwined with the lead wire 6 At the same time as removing the insulation coating, it is soldered to the lead wire 6.

Since the insulating film of the insulating coated wire for forming the coil 3 is an extremely thin resin film, the coil 3 is wound from the state shown in FIG. 6 as shown in FIG. When the lead wire 5 is entangled with the lead wire 6, the insulating film is easily rubbed and peeled off at the corner edge portion of the flange portion 8. Therefore, when a high voltage is applied between the pair of lead wires 6, a current may flow between them and a so-called rare short circuit of the coil 3 may occur. Therefore, conventionally, as shown in FIGS. 5 and 6, the lead wire of the coil 3 is covered with the resin tube 11, and the portion covered with the resin tube 11 is passed through the outer peripheral surface of the flange portion 8. In addition, as another means, a method has been proposed in which, instead of covering the lead wire 5 with the resin tube 11, a resin coating is applied to the ferrite core 1 to form an insulating film on the surface.

[0004]

[Problems that the device is trying to solve]

 However, in the former conventional technique of covering the lead wire 5 of the coil 3 with the resin tube 11, it takes a lot of work to cover the resin tube 11 onto the thin insulation-coated conductive wire, and the portion covered with the resin tube 11 is a flange. The lead wire 5 must be drawn out so as to hit the outer peripheral surface of the portion 8, and the portion of the lead wire 5 covered with the resin tube 11 must be entwined with the lead wire 6. For this reason, detailed work is required and workability is poor, which is an obstacle to increase productivity of the inductor.

Further, in the latter conventional technique of applying a resin coating to the flight magnetic core 1, a step of dipping the resin in the resin in which the fried magnetic core 1 is melted and dipping the resin, and further drying the resin. Is necessary, and still requires considerable effort. Moreover, since the surface tension of the melted resin is high, it is difficult to apply an insulating film of a uniform thickness to the small flight magnetic core 1, and the insulating film of the corners of the winding core portion 7 and the flange portion 8 etc. While the thickness becomes excessively thick, there is a drawback in that the insulating film on the outer peripheral edge of the flange 8 where the insulating film is most needed becomes extremely thin, and sufficient insulating properties cannot be obtained. Therefore, an object of the present invention is to solve the above problems and provide an inductor capable of ensuring the insulation of a lead wire of a coil without requiring a troublesome work such as covering a thin insulating coated wire with a resin tube. Especially.

[0006]

[Means for Solving the Problems]

 That is, according to the present invention, in order to achieve the above object, a ferrite core 1 having a flange portion 8 having a diameter larger than that of the core portion 7 having an outer peripheral surface of a cylinder, and the ferrite core 1 is provided. The coil 3 is wound around the core portion 7 of the above, the lead wire 5 is passed through the peripheral surface of the flange portion 8 and is led to the end surface side of the flange portion 8, and is planted on the end surface of the flange portion 8. In an inductor having a lead wire 6 to which a lead wire 5 of the coil 3 is connected, at least the outer peripheral surface of the flange portion 8 of the ferrite magnetic core 1 on the side where the lead wire 6 is planted and its corner edge are covered. An inductor is provided with an insulating cover member 2 attached thereto.

[0007]

[Action]

 In the inductor according to the present invention, the insulating cover member 2 is attached so as to cover the outer peripheral surface of the flange portion 8 on the side where the lead wire 6 of the ferrite magnetic core 1 is implanted and the corner edges thereof. When the lead wire 5 of the coil 3 is drawn out through the outer peripheral surface of the flange portion 8, the insulating property of the lead wire 5 is ensured by the cover member 2 even if a resin tube is not passed through the lead wire 5, so-called a rare short circuit. Does not happen. Further, the insulating property of the corner edge portion on the outer peripheral side of the flange portion 8 can be reliably obtained.

[0008]

【Example】

 Next, an embodiment of the present invention will be described in detail with reference to the drawings. The ferrite magnetic core 1 is formed of a ferrite molded body, has a tapered core portion 7 in the middle portion, and has flange-shaped flange portions 8 at both ends thereof. Two lead wires 6, 6 are planted on the main surface of one flange portion 8. In the embodiment shown in FIGS. 1 and 2, of the flange portions 8, 8 of the ferrite magnetic core 1, the flange portion 8 on the side where the lead wires 6, 6 are planted is covered with an insulating cover member 2. ing. The cover member 2 is preferably made of, for example, an epoxy resin, a phenol resin, a urethane resin, a polyester resin, a silicone resin, or the like, which is soft and has a Shore hardness of 90 A or less.

Further, from the state shown in FIG. 2, the insulating coated wire is wound around the winding core portion 7 of the ferrite magnetic core 1 to form the coil 3 as shown in FIG. The lead wires 5 and 5 led out from the coil 3 are led to the end face side through the outer peripheral side of the flange 8 covered with the cover member 2 and are connected to the base portions of the lead wires 6 and 6 planted therein. You can Then, by immersing the portion in the molten solder, the insulating coatings of the leads 5, 5 are peeled off and soldered. This completes the inductor according to the present invention.

FIG. 3 shows an example of a ferrite magnetic core 1 before forming the coil 3 and a cover member 2 which covers the flange portion 8 of the ferrite magnetic core 1. As is clear from this figure, the cover member 2 has a cap shape that covers the upper surface and the peripheral surface of the flange portion 8 and has a through hole 10 through which the winding core portion 7 is inserted. Further, the one shown in the drawing has a cut portion 9 on its side surface for facilitating fitting into the flange portion 8, and by spreading this and passing it through the winding core portion 7, fitting into the flange portion 8 is possible. .. After fitting the cover member 2 into the flange portion 8, the cover member 2 may be adhered to the flange portion 8.

FIG. 4 shows another example of the cover member 2. Similar to FIG. 3, FIG. 3A shows the cover member 2 that covers only the flange portion 8 of the ferrite magnetic core 1, but here, the cutting portion 9 as described above is not provided, and Instead, the through hole 10 'is made sufficiently large and the elasticity of the cover member 2 is used to widen the pipe through hole 10' so that the cover member 2 can be fitted into the flange portion 8.

On the other hand, in FIG. 1B, not only the flange portion 8 of the ferrite magnetic core 1 but also the entire peripheral surface of the ferrite magnetic core 1 excluding the end faces of both flange portions 8 can be covered. Members 2 ', 2'are shown. Here, the cover members 2 ′ and 2 ′ have a half-split shape, and the cover members 2 ′ and 2 ′ can be covered from both sides of the flight magnetic core 1. After fitting the cover members 2 ', 2'into the flight magnetic core 1, the cover members 2', 2'may be bonded to the ferrite magnetic core 1, but even if they are not bonded, the cover member 2 ', If the coil 3 is wound around the winding core portion 7 of the flight magnetic core 1 from above the cover member 2 ′, the cover members 2 ′ and 2 ′ can be fixed so as not to be separated from each other.

[0013]

[Effect of the device]

 As described above, according to the present invention, it is possible to obtain the reliable insulation of the lead wire of the coil without requiring a particularly troublesome work in manufacturing, and to provide an inductor having high reliability.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view of an inductor according to an embodiment of the present invention.

FIG. 2 is a side view of a semi-finished inductor according to an embodiment of the present invention.

FIG. 3 is a perspective view showing an example of a ferrite core and a cover member before forming a coil according to an embodiment of the present invention.

FIG. 4 is a perspective view showing another example of the cover member.

FIG. 5 is a vertical sectional side view of an inductor showing a conventional example.

FIG. 6 is a side view of a semi-finished inductor showing a conventional example.

[Explanation of symbols]

 1 Ferrite magnetic core 2 Insulation cover 3 Coil 5 Coil lead wire 6 Lead wire 7 Ferrite magnetic core winding core 8 Ferrite magnetic core flange

Claims (1)

[Reference number] 0030502-01 [Claims for utility model registration] 1. A ferrite core 1 having a flange 8 having a diameter larger than that of the core 7 at the end of a core 7 having a cylindrical outer peripheral surface, and a core 7 of the ferrite core 1. The lead wire 5 is attached to the coil 3 through which the lead wire 5 passes through the peripheral surface of the flange portion 8 and is led to the end surface side of the flange portion 8, and the lead wire 5 of the coil 3 is planted on the end surface of the flange portion 8. In an inductor having a lead wire 6 connected thereto, an insulating cover member 2 is provided so as to cover at least the outer peripheral surface of the flange portion 8 of the ferrite magnetic core 1 on the side where the lead wire 6 is planted and its corner edges. An inductor characterized by being mounted.