JPH0510341Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" This invention relates to a small transformer used to convert voltage or impedance.

"Conventional technology" In conventional small transformers, the winding frame (bobbin)
A primary winding is wound around the primary winding, and a secondary winding is wound on top of the primary winding with a wire of a different thickness from that of the primary winding.

Because of this configuration, when assembling the transformer, the winding machine automatically winds the primary winding, and then the winding machine is replaced or the supply wire is replaced and the secondary winding is wound. Therefore, a lot of time and effort were required for the work from winding the primary winding to starting winding the secondary winding.

The object of this invention is to provide a compact transformer that allows continuous winding of a primary winding and a secondary winding.

``Means for Solving the Problems'' This invention also consists of a bobbin, a primary winding, and a secondary winding, similar to the conventional small transformer, and both of these windings are constructed of wires made of the same material. That is, the wires of one winding are extended and folded an even number of times to approximately the same length to form an odd number of wire bundles, and the odd number of wire bundles are twisted to form the wires of the other winding. The electric wire of the first winding and the electric wire of the second winding are continuous with each other and are not cut midway.

With this configuration, for example, the wire is supplied to the winding machine through a twisting machine that twists the wire, and the wire supplied by the winding machine is directly transferred to the first winding machine.
The wire that is wound as a winding wire and supplied to a twisting machine after being wound a predetermined number of times is folded back an even number of times to form an odd number of wire bundles, and then the wire bundle is twisted in the twisting machine, and the twisted wire is The bundle is fed to the winding machine and wound as a second winding.
Therefore, the winding work can be performed continuously from the first winding to the second winding without replacing the winding machine.

``Example'' Figure 1 shows a small transformer based on this invention.
In this example, the wire is wound in the shape of a winding frame, and the winding frame (bobbin) 11 has a rectangular cylindrical shape as shown in FIG. 13 is integrally formed, for example, as a molded product of resin material. One of the limiting plates 13 is used as a substrate, with two terminals 14 and 15 on one side and three terminals 1 on the other side.
6, 17, and 18 protrude substantially perpendicularly to the restriction plate 13.

A first winding 21 is placed on the winding frame 11, and in this example, the first winding 22 is wound many times between the limiting plates 12 and 13 as a so-called empty winding, and the inner end thereof is connected to the terminal 14 by the limiting plate. It is connected by winding it through a groove 23 formed on the side surface of 13 (FIG. 2).

A second winding 24 is wound on the first winding 21,
This is a case where the second wire of the second winding 24 is thicker than the first wire 22. For example, as shown in FIG.
The first electric wire 22 is pulled out from, for example, the position of the restriction plate 12 with the first electric wire 22 wound slightly less than a predetermined number of times, and the first electric wire 22 is folded back an even number of times to form an odd number of electric wire bundles 26. FIG. 4 shows a case where three wires are bundled, and the folding is done at almost the same length, and the wire bundle 26 is twisted and the second wire 25 is folded back.
It is said that

Thereafter, in FIG. 4, the extended portion of the wire 22 of the first electric wire is wound onto the winding frame 11, and the connected second electric wire 25 is then wound as shown in FIG. In this case, a common terminal 16 is provided for the first winding and the second winding, and the terminal 16 is provided after the second electric wire 25 is wound once, for example.
It is connected by winding it through the groove 27 of the restriction plate 13.
The end of the second electric wire 25 is wound and connected to the terminal 18 through the groove 28 of the restriction plate 13.

This small transformer can be manufactured, for example, as shown in FIG. That is, the electric wire 22 drawn out from the power supply source 31 is supplied to the twisting machine 33 through the tension device 32 with an appropriate tension applied thereto. The electric wire that has passed through the twisting machine 33 is wound onto the winding frame 11 by a winding machine 34 (not shown in the figure).

In this case, the twist machine 33 is not operated at first,
The electric wire 22 is supplied as it is to a winding machine 34 to wind up the first winding 21. After winding a predetermined number of times, winding machine 3
4 is temporarily stopped, the twisting machine 33 is operated, and the electric wire 22 is folded a predetermined even number of times and for a predetermined length. This folding length is twist machine 3
It can be set within the length range in the electric wire passing direction of No. 3. After this turn, twist machine 3
In step 3, the folded odd-numbered bundle of wires is twisted,
The twist pitch can be set. After the second electric wire 25 is produced in this manner, the operation of the twisting machine 33 is stopped, and the operation of the winding machine 34 is restarted to wind the second winding wire 24. The winding machine 34 generally winds the winding wire around the terminal,
It is configured so that the wire can be cut, and therefore, from the start of winding of the first winding 21 to the end of winding of the second winding 24, and until the end of connecting the lead wire to the terminal. This work can be performed continuously without any manual intervention.

For example, the first electric wire 22 having a wire diameter of 0.05 mm is wound 500 times, the first electric wire is made into a bundle of five, the second electric wire 25 is made, and the second electric wire 24 is wound 15 times. Note that the first winding and the second winding are connected to a common terminal 16.
When connecting to the terminal 16, the second electric wire 25 close to the first electric wire 22 is connected to the terminal 16 to prevent disconnection. In this embodiment, if the second winding 24 is used as the primary side and the first winding 21 is used as the secondary side, a high voltage can be raised. The voltage difference between the portions where the second winding and the first winding are in contact is small.

"Effects of the invention" As stated above, the small transformer of this invention allows the first and second windings to be performed continuously, eliminating the need to replace the winding machine or the winding material. ,
It is possible to shorten manufacturing time and reduce manufacturing costs. Furthermore, since the second winding is composed of a plurality of stranded wires, it is possible to prevent loss due to the skin effect in high frequency bands.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an example of a small transformer according to this invention, Fig. 2 is a front view showing its winding frame, Fig. 3 is a front view with the first winding and the second winding in cross section,
Fig. 4 is an explanatory diagram of the case where a second electric wire is made continuously at the end of the first winding, and Fig. 5 is a schematic diagram showing the mechanical arrangement sequence from the power supply to the winding of the transformer of this invention. .

Claims (1)

[Claims for Utility Model Registration] A bobbin, a first winding wound around the bobbin in a cylindrical shape, and a second winding magnetically coupled to the first winding and wound around the bobbin in a cylindrical shape. one end of a first electric wire constituting the first winding and one end of a second electric wire constituting the second winding are connected to each other, and the second electric wire is connected to the first electric wire. An odd number of wires made of the same material is twisted to approximately the same length an even number of times, and one end of the folded wire is continuous with the first wire, and is attached to the bobbin. A small transformer in which a portion of the second electric wire close to the first electric wire is wound and connected to a common terminal of the second electric wire.