JPS5915487B2 - Method of manufacturing electromagnetic devices - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing electromagnetic devices such as discharge lamp ballasts.

In a conventional electromagnetic device in which a plurality of iron cores are butted together and a coil is inserted between them, in order to improve the insulation between the winding 2 of the coil 1 and the iron core 3, as shown in Fig. The wire 2 is covered with an insulating tape 6 over the entire width between the two ribs 5, 5 of the bobbin 4, and in order to ensure insulation between the winding side edge near the rib 5 and the iron core 3, Winding 2 to collar 5
A creepage distance of 5 mm is ensured by ensuring that the wire does not wrap around the height of the brim.

As a result, there is a large gap □ between the insulating tape 6 and the iron core 3.
Therefore, there was a problem that the electromagnetic device could not be miniaturized. Therefore, an object of the present invention is to provide a compact electromagnetic device that has good insulation between the winding of the coil and the iron core, and also allows the winding work to be performed reliably and easily. An object of the present invention is to provide a manufacturing method.

An embodiment of this invention will be explained with reference to FIG.

15 First, the coil 1 is wound to a certain height over the entire width of the bobbin 4 to form a winding 8, and then on both ends of the winding 8, an insulating material 9 of a predetermined width is placed on the inner surface of both collars 5, 5. 10 is wound up to the height of the collar 5, and further, a winding Ba continuous with the winding 8 is added between the insulating materials 9 and 10 by '0' winding.

Then, the outer periphery of the bobbin 4, including the surface of the winding Ba and the insulating materials 9 and 10, is covered with an insulating tape 6, and the E-type iron core 3 is covered with an insulating tape 6.
and the T-shaped core 3a to form an electromagnetic device. Since there is no air gap between the coil 1 and the E-type core 3 in this way, the electromagnetic device can be made smaller, and the amount of winding can be reduced near the collar 5 of the bobbin 4, which is prone to poor insulation. Since the creepage distance is secured and the insulating materials 9 and 10 are wrapped around the bobbin 4, and the outer periphery of the bobbin 4 is covered with the insulating tape 6, the insulation between the E-type iron 30 core 3 and the winding 8 and Ba is good. ing. In addition, the winding 8 and the insulating material 9
, 10 and the winding Ba, the winding Ba is wound between the two insulating materials 9, 10, so that the winding Ba, the insulating materials 9, 10 are fixed to each other. .
35 Therefore, for example, during winding, the number of turns is reduced by several rows at both ends of the coil from several stages before the final stage winding to form a groove between the bobbin collar and the wire, and then an insulating material is wound in this groove. However, it is difficult to wind the wire, and the winding work becomes extremely complicated due to the winding collapse and the resulting variation in the groove cross section, which may cause the insulation coating of the coil to peel off, making it impossible to wind the wire reliably. Winding work becomes reliable and easy.

As described above, in this invention, a wire is wound to a certain height over the entire width of a bobbin, and an insulating material is wound along the inner surface of both ribs to the height of the ribs several stages before the final winding. Since the winding is wound between both insulating materials, the winding can be done reliably without any collapse of the winding, and the insulating material ensures a stable creepage distance with no variation, and automatic winding is easy. There is no peeling of the insulation coating, making winding work extremely easy.

Moreover, there is an effect that the entire device does not need to be enlarged.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a conventional electromagnetic device, and FIG. 2 is a cross-sectional view showing an embodiment of the electromagnetic device manufactured according to the present invention. 1... Coil, 3, 3a... Iron core, 4
...Bobbin, 5...Brim, 6...
...Insulating tape, 8, 8a... Winding wire, 9, 10
······Insulating material.

Claims (1)

[Claims] 1. Wrap a coil around the bobbin that fits into the middle leg of the iron core up to the height of its brim, bury insulating material along the inside edge of the brim, and then cover the coil surface, including the circumferential surface of the brim, with insulating tape. In the method for manufacturing an electromagnetic device, the coil is wound to a certain height over the entire width of the bobbin in the coil winding process, and at a stage several stages before the final stage winding, the coil is wound on the inner surfaces of both ribs. A method of manufacturing an electromagnetic device, characterized in that the insulating material of a predetermined width is wound along the length of the insulating material up to the height of the brim, and a winding up to a final stage winding is further wound between the insulating materials.