JPS6258644B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for winding a coil for induction electromagnetic equipment.

In induction electromagnetic devices, such as ballasts for discharge lamps,
A coil is wound around a columnar part of an iron core. Conventionally, a bobbin is made in advance from a thick board, etc., a core material with the same cross-sectional shape is inserted into the bobbin, the core material is rotated, the electric wire is wound around the bobbin by the rotation, and then the core material is inserted into the bobbin. The bobbin removed from the iron core was fitted into the iron core.

However, according to such a method, in order to fit the iron core onto the bobbin around which the electric wire is wound, the cross section of the bobbin after the electric wire is wound must be larger than the cross section of the iron core in order to make the fitting possible. Therefore, it is inevitable that the bobbin will wobble about the iron core after fitting. When such rattling occurs, the steel plates that make up the iron core also rattle. Therefore, this causes noise generation.

An object of the present invention is to prevent the generation of noise due to the vibration of the iron core by tightening the iron core in a pressurized state.

Embodiments of this invention will be described with reference to the drawings: 1
2 is an iron core, and 2 is a coil, which is constructed by winding an electric wire 4 around a bobbin 3. As described above, the coil 2 is constructed by inserting a core material into the bobbin 3 and winding the wire while rotating the core material. The coil manufactured in advance in this way is fitted to the iron core 1, but at that time, a cylindrical film 5 made of heat-shrinkable resin is placed between the bobbin 3 and the iron core 1 so as to surround the outer periphery of the iron core 1. Set it up. Specifically, as shown in FIG. 2, a film 5 is fitted onto a portion of the iron core 1 where the coil 2 is wound. Then, the bobbin 3 of the coil 2 is fitted onto the outer circumferential side thereof.

After the coil 2 is fitted onto the iron core 1 in the manner described above, pressure is applied from the outer periphery of the coil 2 in the direction of the arrow by the pushers 6 to 9, as shown in FIG. Due to this pressurization, the inner surface of the bobbin 3 is brought into close contact with the outer surface of the iron core 1, and there is no gap between the two, and the iron core 1 is also pressurized, so that the steel plates come into close contact with each other. At the same time as this pressurization, the film 5 is heated. This heating may be performed, for example, by heating the coil 2. As the film 5 contracts due to this heating, the iron core 1 is placed under the above-mentioned pressure.
It is now tightened by the shrink film 5.
As a result, the state in which the steel plates of the iron core 1 are pressed into close contact with each other is maintained as it is. After the film 5 has sufficiently shrunk, the pressure from the pushers 6 to 9 is released.

If the coil is wound around the iron core as described above,
The iron core is tightened by the shrinkage of the film while the steel plates are kept in close contact with each other under pressure.
The steel plates that make up the iron core are fixed, so vibrations of the steel plates are suppressed. This makes it possible to reliably prevent noise caused by vibration of the steel plate.

As described above, according to the present invention, it is possible to easily prevent the generation of noise from the iron core.

[Brief explanation of the drawing]

FIG. 1 is a front view for explaining an embodiment of the method of the present invention, and FIG. 2 is a perspective view showing an example of the process. 1...Iron core, 2...Coil, 3...Bobbin, 4
...Electric wire, 5...Film.

Claims (1)

[Claims] 1 A coil made by winding an electric wire around a bobbin,
A cylindrical film made of heat-shrinkable resin is interposed between the inner surface of the bobbin and the outer surface of the iron core, and is fitted onto the iron core, and the film is heated while the coil is pressurized from its outer periphery. and a method for winding an induction electromagnetic coil, comprising tightening the iron core by shrinking the film.