JPS6041706Y2 - transformer winding - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to an improvement in a cylindrically wound transformer winding, such as a low voltage winding of a transformer.

As shown in Figure 1, the cylindrical winding used in conventional electromagnetic induction equipment such as transformers is made by winding a conductor 1 whose surface is coated with insulating varnish or the like in the circumferential direction of a winding core 2. It is configured.

At the winding start and winding end of the conductor 1, a straight portion 1a is provided which is bent in substantially the same direction as the central axis of the winding core 2 in order to connect to another conductor (not shown).

In this case, the insulating varnish etc. at the bent part of the conductor 1 will be damaged and the dielectric strength will decrease, so as shown in Figure 2, the area near the bend is wrapped with insulating tape 3 to strengthen it. It is covered with a plastic tube 4, which partially overlaps with the insulating tape 3.

With such a configuration, there is a possibility that the conductor may be moved when connecting the straight part and other lead wires, or that the overlapping part of the plastic tube and insulating tape may come off, or that the insulating tape may come off. The drawback is that there is a risk that defects may occur in the electrical insulation.

In order to compensate for the above drawbacks, a method of increasing the number of turns of the insulating tape is also used, but since the dimensions of the starting part of the tape swell more than the other parts, when cylindrical cores are stacked concentrically, the bulge is increased. However, there was a drawback that the outer diameter of the outer winding core became larger.

This idea was made to eliminate the above drawbacks.
The conductor in the straight part is bent in approximately the same direction as the central axis of the cylindrical core, and the conductor adjacent to the straight part and having a predetermined length in the circumferential direction of the core has continuous flexibility. It is an object of the present invention to provide a transformer winding in which insulation at the beginning and end of the winding can be improved by covering the winding with a plastic tube.

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

In the figure, numerals 1 and 2 are the same as the conventional one.

Reference numeral 5 denotes a flexible plastic tube that is adjacent to the straight portion 1a and is placed over the conductor 1 for a predetermined length in the circumferential direction of the winding core 2.

According to this invention, the conductor in the straight part bent in almost the same direction as the central axis of the core, and the conductor adjacent to the straight part and having a predetermined length in the circumferential direction of the core are continuously flexible. By covering the outer core with a plastic tube that has a It also becomes easy to combine with wound wires.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the winding of a conventional transformer, Fig. 2 is a perspective view showing the insulation near the winding start of a conventional transformer, and Fig. 3 is a perspective view showing an embodiment of this invention. be. In the figure, 1 is a conductor, 1a is a straight portion, 2 is a winding core, and 5 is a plastic tube. Note that the same reference numerals in each figure indicate gaps or corresponding parts, respectively.

Claims (1)

[Scope of utility model registration request] A conductor whose surface is insulated is wound around a cylindrical core, and the end of the conductor has a straight part bent in approximately the same direction as the central axis of the core, where the straight part of the conductor is A winding for a transformer, characterized in that a flexible plastic tube is continuously placed over the linear portion and the conductor having a predetermined length in the circumferential direction of the winding core.