JPS6314406Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a rotary transformer having primary and secondary annular magnetic material cores each having coil grooves facing each other on the inner and outer circumferential walls facing each other in close proximity to each other. In particular, the mounting and shaping of the wire in the wire groove can be carried out easily and reliably.

In conventional rotary transformers of this type, wire or band-shaped conductors made of continuous electrolytic copper are used exclusively as the wires installed in the wire grooves, and the wire ring is formed easily due to the flexibility of the electrolytic copper material. The idea was to take advantage of the ease and good conductivity inherent in electrolytic copper. However, although the flexibility of the electrolytic copper material has the advantage of facilitating the molding of the coil, it also has the disadvantage of complicating the manufacturing process for mounting the coil. For example, a rotating transformer used for signal input to a rotating magnetic head in a video tape recorder, that is, a so-called VTR, has its rotor side connected to the rotating magnetic head, and also has a preamplifier or output amplifier on its stator side. It connects to and mediates the exchange of signals between them.
As the bandwidth of VTRs becomes wider, design changes such as changes in the number of windings and winding diameter are often made in order to reduce the inductance, so it is necessary to make it possible to easily install rotating transformer windings. However, in conventional rotary transformers of this type, it is necessary to install the wire along the wire groove provided on the inner peripheral wall surface or the outer peripheral wall surface of the annular magnetic material core. When installing a wire ring in a ring shape in a wire groove provided on the inner circumferential wall, there is no center for winding the wire, so it is not possible to wind the wire directly into the wire groove. It was possible, but it was necessary to use a winding jig. Also,
When installing a wire into the wire groove provided on the outer peripheral wall surface of the inner annular magnetic material core as a primary wire ring that rotates at high speed, there is no problem with the winding center mentioned above, but the outer annular magnetic material The primary wire ring, which rotates at high speed in close proximity to the core and its wire ring, should be sufficiently secured to prevent problems such as loosening due to centrifugal force and contacting the outer fixed wire ring, or changing the degree of bonding. The manufacturing process was complicated, as a winding jig was also required to tighten and secure the wire.

Various types of wire winding jigs have been used in the past.One example is as shown in Figures 1a to 1c'. When a wire ring is installed in the winding groove provided on the inner circumferential wall surface of the annular magnetic material 1, a cylinder that smoothly contacts the inner circumferential wall surface of the annular magnetic material core 1 and has an oblique hole 72 for feeding the wire rod. The winding jig 71 is shown in the same figure.
Insert the wire rod 70 into the coil as shown in a', and with the terminal port 4 provided in the annular magnetic material core 1 communicating with the diagonal hole 72 for feeding the wire rod of the winding jig 71, the coil wire rod 70 is wound. The lead wire 5 is inserted from the inside of the jig 71 to the outside of the annular magnetic material core 1, and its tip is pulled out to a required length and fixed to the outer peripheral wall surface of the annular magnetic material core 1.
shall be.

Next, when the annular magnetic material core 1 is held and the winding jig 71 is rotated clockwise, for example, as shown in FIGS. It is wound along the outer circumferential wall surface into a wire ring groove 2 provided on the inner circumferential wall surface of the annular magnetic material core 1 . FIGS. 1a and a' show the state at the start of winding, and FIGS. 1b, c, and c' show the states after 1/4 turn and 3/4 turn, respectively.

As described above, the winding jig 7 is
1 is rotated, the winding wire material 70 is cut taking into account the length of the part that will form the lead wire at the other end of the wire ring, and then the winding jig 72 is further rotated. The rear end of the wire rod 70 passes through the wire feeding diagonal hole 72 and leaves the winding jig 71. In this state, the wire rods forming the required wire ring and the inner surface of the wire groove are temporarily fixed with adhesive, and then the winding jig 71 is removed, and then,
The temporarily fixed wire rings were sufficiently formed and then fixed with adhesive.

Therefore, in conventional wire ring formation using such a winding jig, each time the diameter of the annular magnetic material core or the wire diameter of the wire used is changed, appropriate measures must be taken to accommodate the changes. It is necessary to remanufacture the winding jig with the same shape and dimensions, which not only complicates the process of installing the wire ring, but also makes it uneconomical to manufacture many types of rotating transformers in small quantities. It was hot.

The purpose of the present invention is to eliminate the above-mentioned conventional drawbacks, eliminate the need for the use of a winding jig, and by appropriately selecting the wire material, wire rings provided on the inner and outer peripheral wall surfaces of the annular magnetic material core can be formed. To provide a rotary transformer in which a wire ring can be easily and reliably installed and formed into a groove.

In other words, in order to eliminate the need for a winding jig, the rotary transformer of the present invention uses a conductor having elasticity, such as phosphor, in the wires constituting the wire, which is installed in the wire grooves provided on the inner and outer circumferential walls of the annular magnetic core. A wire or strip made of bronze or beryllium copper is used, and the wound wire is pressed against the bottom of the wire groove to maintain itself by utilizing the restoring force of the conductor within the range of elastic deformation. In a rotating transformer that has annular magnetic material cores on the primary side and the secondary side, the inner and outer circumferential walls facing each other are provided with ring grooves facing each other. The present invention is characterized in that a wire ring is wound around the bottom surface of the wire groove using the restoring force of the conductor and pressed against the bottom surface of the wire groove.

The invention will be explained below by way of example with reference to the drawings.

First, with reference to FIGS. 2 to 4, an outline of the coil mounting in the rotary transformer of the present invention will be explained. To explain the case of installing the next side track,
As shown in the cross section of FIG. 2, in order to attach the wire 3 in contact with the bottom surface of the wire groove 2 provided on the inner circumferential wall surface of the annular magnetic material core 1, the above-mentioned elastic wire is The ring groove 2 on the inner circumferential wall surface of the annular magnetic material core 1 shown in FIG. In the form of the annular wire ring 6 shown in
For example, by using a suitable winding center body, the elastic wire is wound in advance and formed into the form of an annular wire ring 6, and then the tip of the formed elastic wire is While compressing the annular magnetic core 1 to a size smaller than the diameter of the inner circumferential wall of the annular magnetic core 1 within the range, insert the annular magnetic core 1 into the side cavity of the annular magnetic core 1. While unraveling the once formed annular wire ring, insert its tip into the magnetic material core 1. For example, the remaining wire is held so as to protrude from a terminal port 4 provided on the outer circumferential wall surface and communicated with the wire ring groove 2 on the inner circumferential wall surface, and the remaining wire is sequentially fed into the magnetic material core 1 while being compressed. When the wire is sequentially fed along the bottom surface of the wire groove 2 and wound to the shape and dimensions of the annular wire 7, the wound elastic wire tries to restore the size of the circle 6 within the range of elastic deformation. Then, due to its restoring force, it comes into pressure contact with the bottom surface or side wall surface of the wire ring groove 2, and self-maintains in a predetermined wire shape. Lead wires 5 are connected to both ends of the self-formed elastic wire by, for example, soldering and drawn out from the terminal port 4.

As mentioned above, due to its elastic restoring force, the wire ring 3 in the rotary transformer of the present invention has a much better closeness to the inner circumferential surface of the wire groove 2, especially the bottom surface, compared to the conventional one. Significantly increases the adhesive effect of adhesives conventionally used as post-treatment,
Alternatively, it can be made unnecessary.

Next, a fifth example of the configuration of the rotary transformer of the present invention will be described in which the secondary side coil arranged on the outside is configured using an elastic band-shaped wire material as in the above example.
As shown in the figure. In the illustrated configuration example, in the wire groove 2 provided on the inner circumferential wall surface of the annular magnetic material core 1, as described above with reference to FIG. An elastic band-shaped wire 8 which has been wound and formed into an annular shape is pressed into contact with the bottom surface of the wire groove 2 by its elastic restoring force, and the lead wires 9 and 10 are inserted into the magnetic material core 1 from the terminal opening 4. , both ends 11 and 12 of the elastic band-shaped wire 8 are soldered.

Next, in close opposition to the secondary fixed wire ring 8 attached to the outer annular magnetic material core 1 described above with reference to FIG. FIG. 6 shows the external appearance of the rotary transformer of the present invention in which the primary rotating coil is mounted in combination, and FIG. 7 shows the external appearance of the inner annular magnetic material core 13, and the primary rotating coil 20
The manner of winding is shown in FIGS. 8 and 9, respectively. It goes without saying that the rotary transformer of the present invention can be constructed in the same manner by using the outer coil 8 as a primary rotating coil and the inner coil 20 as a secondary fixed coil, if necessary.

Therefore, the inner annular magnetic material core 13 has a hollow portion formed as a core support shaft hole 15 or 19,
Further, a wire ring groove 17 is provided on the outer peripheral wall surface, and the terminal opening groove 18 is in cross communication with the wire ring groove 17.
is provided, and the end face opening of the terminal opening groove 18 is connected to the terminal opening 1.
4, lead wires 16 soldered, for example, to both ends of the wire ring 20 are drawn out from the terminal openings 14 thereof. As shown in FIG. 9, the wire ring 20, which is made of a linear or band-shaped elastic wire like the outer wire ring 8, is formed in a wire groove groove provided on the outer peripheral wall surface of the inner annular magnetic material core 13. 17, which has a smaller diameter than the circle 22 shown in dashed lines in FIG.
The elastic wire is wound and formed into the shape of an annular wire ring 21 shown by a solid line in the figure, and is pressed against the bottom or side surface of the wire ring groove 17 in the same manner as described above with reference to FIGS. 2 to 4. It is wound, and its elastic restoring force allows it to self-retain and form.

As is clear from the above explanation, according to the present invention, without using a winding jig as in the past,
Elastic wires are wound around the inner and outer circumferential walls of the annular magnetic core for self-retention, making it possible to mount the rotary transformer wire much more easily and reliably than in the past, making it possible to change the design of the rotary transformer, etc. This makes it extremely easy to cope with the need to change the number of turns of the coil or the diameter of the annular magnetic material core and therefore the diameter of the coil. It is possible to simplify the configuration and reduce the manufacturing cost.

In addition, when forming a wire ring by winding a wire rod multiple times, except when winding a strip wire rod in a single turn as shown in Fig. 5, use a coated wire rod or the like to separate the windings. Of course, it should be insulated.

In addition, in the rotary transformer of the present invention, the wire material constituting the wire ring has a conventional specific resistance.
In place of electrolytic copper with a specific resistance of 1.75μΩcm
Phosphor bronze of 16μΩcm or resistivity 6.8~
Since beryllium copper of 9.8μΩcm is used, the resistance value of the wire will increase.
There is no problem in practical use with small rotary transformers for VTRs and other applications where the number of wire windings is small, and if an increase in resistance becomes a problem, the cross-sectional area of the wire can be increased appropriately. can be easily dealt with.

[Brief explanation of drawings]

Fig. 1a-c' are front views and side cross-sectional views sequentially showing the manufacturing process of a conventional rotary transformer, Fig. 2 is a cross-sectional view showing an example of the configuration of the magnetic core of the rotary transformer of the present invention, Fig. 3 is a perspective view showing the appearance of the same, Fig. 4 is a diagram showing an example of the coil mounting mode of the same, Fig. 5 is a perspective view showing an example of the configuration of the rotary transformer of the present invention, Fig. 6 is a perspective view showing another example of the magnetic core configuration of the same, Fig. 7 is a perspective view showing the appearance of the same, Fig. 8 and Fig. 9 are cross-sectional views and diagrams respectively showing the coil winding mode of the same. 1, 13... annular magnetic core, 2, 17... coil groove, 3, 20... coil, 4, 14... terminal port,
5, 9, 10, 16...leads, 6, 21...
Formed coil, 7, 22...annular coil, 8...belt-shaped coil, 11, 12...wire end, 15, 19...hole for support shaft, 18...terminal groove, 70...wire for coil, 71...winding jig, 72...oblique hole.

Claims (1)

[Claims for Utility Model Registration] 1. In a rotary transformer having primary and secondary annular magnetic material cores, each of which has opposing coil grooves on the inner and outer circumferential wall surfaces that face each other in close proximity to each other. 1. A rotary transformer comprising a wire ring made of an elastic conductor, which is wound so as to be in pressure contact with the bottom surface of the wire groove using the restoring force of the conductor. 2. In the rotating transformer according to claim 1 of the utility model registration claim, the wire ring is formed by an elastic wire or band-shaped conductor pre-wound in an annular shape having a diameter different from the diameter of the circle formed by the wire groove. A rotating transformer characterized by comprising: