JPS6072208A - Manufacture of toroidal coil - Google Patents

Abstract

PURPOSE:To obtain the titled coil suitable for an automatic mass production system by shaping a bobbin into a circle after winding a winding on a periphery of a straight bobbin having a hollow hole and by injecting a compound material composed of a magnetic oxide such as ferrite and synthetic resin into said hole to make it a closed magnetic circuit. CONSTITUTION:A winding 6 is wound on a periphery of a straight bobbin 5 consisting of a ferrite resin compound material having a hollow hole 4 and this bobbin 5 is shaped into a circle 7. Next, a ferrite resin compound material 8 is injected into the hollow hole 4 from a space peoduced in a part of a ring of the circle 7 and the compound material 8 is exposed in the space to produce a closed magnetic circuit 9. At this time, for the compound material 8, a mixture consisting of a magnetic oxide such as ferrite and a synthetic resin is used. Thus, it becomes possible to use an automatic winding machine and an extrusion shaping machine for the winding 6 and the injection of the compound material 8 respectively. Accordingly, the coil becomes suitable for the automatic mass production system.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for manufacturing toroidal coils used in various electronic devices, electrical appliances, power control devices, and the like.

Structure of conventional example and its problems In the conventional manufacturing method of toroidal coil, winding was performed on a ready-made ferrite toroidal core. There are three winding methods: hand winding and mechanical winding. When winding is done by hand, as shown in Figure 1 A to C, the winding length corresponding to the number of turns of the conductor is determined in advance. The toroidal coil 3 was manufactured by preparing the winding wire 2 for cutting, holding one end of the winding wire 2, and repeatedly passing it through the toroidal core 1 to wind the wire.

Furthermore, even when winding is performed using a toroidal winding machine, the actual situation is that winding cannot be performed unless the conductor wire corresponding to the winding length described above for manual winding has been wound around the wire storage ring in advance. . As described above, both the manual method and the method using a toroidal winding machine took a considerable amount of time, and the winding time doubled as the number of wires in the coil increased.

Therefore, toroidal coils have traditionally been considered to be coils that should not be left in mass production.

OBJECTS OF THE INVENTION The present invention provides a method for manufacturing toroidal coils that can be automated and mass-produced by improving the above-mentioned drawbacks.

Structure of the Invention The present invention involves forming a coil into a circle by winding a wire around a bobbin having a hollow hole, and injecting a composite material made of a magnetic oxide such as ferrite and a synthetic resin into the hollow hole of the coil to close the magnet. It consists of roads.

DESCRIPTION OF THE EMBODIMENTS The manufacturing process according to an embodiment of the present invention is shown in FIG.

First, as shown in Fig. 2A, winding 6 is applied to a bobbin 6 made of a ferrite resin composite material having a hollow hole 4 as shown in Fig. 2, and then it is formed into a circular shape 7 as shown in Fig. 2C. do. Next, a ferrite resin composite material 8 is injected through the hollow hole 4 to form a closed magnetic circuit 9, thereby forming a toroidal coil 1o as shown in FIG. The lead wire 11 may be soldered directly to another connection body, or may be wound around a terminal of a terminal board and then soldered.

The ferrite resin composite material is a mixture of ferrite and synthetic resin.

In addition, the second figure shows a cross-sectional structure taken along the line A-A' in the opening of the second figure.As is clear from this second figure, the ferrite resin composite material 8 is inside the hollow hole 4 of the bobbin It will be filled with.

Effects of the Invention According to the present invention, the winding can be performed using an automatic winding machine, and the ferrite resin composite material can also be automatically injected using an injection molding machine, which is different from the conventional method. The toroidal coil, which had been considered a non-automated, mass-produced coil, now has an automated mass-production method, which has significantly contributed to the development of industry.

[Brief explanation of drawings]

1A to 1C are process diagrams showing a conventional toroidal coil manufacturing process, and FIGS. 2A to 2E are process diagrams showing a toroidal coil manufacturing process according to an embodiment of the present invention. 4...Hollow hole, 5...Bobbin, 6...
・Winding wire, 8... Ferrite resin composite material, 10.
...Toroidal coil. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure <A) (Ha2 Figure 2 (A) (Hara (2p)

Claims (1)

[Claims] A toroidal coil is made by forming a coil wound around a bobbin with a hollow hole into a circular shape, and injecting a composite material made of a magnetic oxide such as ferrite and a synthetic resin into the hollow hole of the coil to form a closed magnetic circuit. Production method.