JPS60130111A - Rotary transformer - Google Patents

Abstract

PURPOSE:To equalize the inductance between each channel and contrive to miniaturize by overlapping a rotor and a stator inserted with a coil in a recessed groove provided on one or both surfaces of a disk shape ferrite core. CONSTITUTION:Among disk shape ferrite cores 12-14, a recessed grooves 15- 18 are made on one surface of the cores 12 and 14, recessed grooves 16, 17 are made on both the surfaces of the core 13 and each groove is inserted with a coil 19-22 respectively. The cores 12-14 are provided around an axis 23 and a definite interval is kept between the cores 12 and 13 and between the cores 13 and 14. The cores 12, 14 are made a stator and the core 13 is made a rotor. Assume the coils 19 and 20 are made channel I and the coils 21 and 22 are made channel II, the inductance L of both the channels can be equalized. In this construction, the L can be equalized between each channel of a rotary transformer even if in multichannels and the equipment can be miniaturized in the direction of the diameter. If the shape of the disk core is made the same, standardization and mass production are also possible.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a rotary transformer used in video tape recorders and the like.

Conventional Structures and Problems Generally, rotary transformers are widely known as components used in video tape recorders and the like to transmit recording signals to a rotating magnetic head or transmitting playback signals from a rotating magnetic head without contact using magnetic coupling. It is being

The conventional rotary transformer as described above will be explained below with reference to the drawings.

FIG. 1 shows a cross-sectional view of a conventional rotary transformer. In FIG. 1, a stator core 2 and a rotor core 3 made of a flat ferrite core are arranged around a cylinder axis 1, and the rotor core 3 and stator core 2 are arranged so as to maintain a constant air gap. Two concentric grooves 4 and 6 are provided in the stator core 2, and coils 8 and 9 formed by winding copper wire or the like are inserted into the grooves 4 and 5. Is the rotor core 3 also two concentric concave holes? +'p 6+
7h' are provided, and the coils 1o, 1 are placed in the grooves 6, 7.
1 is inserted.

In such a conventional flat plate rotary transformer, the inductance values of the inner coils 4 and 6 and the outer coils 6 and 7 differ greatly, and it was necessary to adjust the inductance in the circuit. In addition, as the number of channels increases, the inductance becomes worse.Also, as the number of channels increases, the shapes of the stator and rotor cores become extremely large, causing distortion and warpage during core manufacturing, which reduces productivity. Along with this, the cylinders of video tape recorders and the like have become extremely large, creating a major problem in miniaturization.

OBJECTS OF THE INVENTION The present invention is intended to improve the above-mentioned problems by equalizing the inductance values between each channel, eliminating the need for adjustment in the circuit, and realizing miniaturization in the radial direction.

Structure of the Invention In order to achieve this object, the present invention has been developed by using a disc-shaped ferrite core on one side. Alternatively, the present invention relates to a rotary transformer characterized in that a rotor core and a stator core having a single groove provided on both sides and a coil inserted into the groove are stacked in an arbitrary number of channels.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 shows the structure of the mouth-to-tally transformer in the first embodiment of the present invention. In Figure 2, 12,
13.14 is a disk-shaped ferrite core, the disk-shaped ferrite cores 12 and 13 are provided with grooves 15 and 18 only on one side, and the disk-shaped ferrite core 13 is provided with grooves 17 and 18 on both sides.
There are 16. Concave groove 1 of disk-shaped ferrite core 12
A coil 19 is inserted into the groove 16 of the disc-shaped ferrite core 13, and a coil 2Q is inserted into the groove 1γ of the disc-shaped ferrite core 13.
A coil 21 is inserted into. Further, a coil 22 is inserted into the groove 18 of the disc-shaped ferrite core 14. The disc-shaped ferrite cores 12, 13, and 14 are arranged around the cylinder axis 23, and a constant gap is maintained between the disc-shaped ferrite cores 12, 13, and 13, 14.

The operation of the rotary transformer configured as above will be explained below.

First, if the disk-shaped ferrite cores 12 and 14 are used as the stator core on the stationary side, they become the rotor cover 13 on the rotating side. For example, if coils 19 and 20 are placed between channels, and coils 21 and 22 are placed on channel 2, the inductance values of channels 2 and H can be made equal.

In Fig. 3, the basic structure is the same as that explained in Fig. 2, but the disc-shaped ferrite cores 12, 13° 14 are both of the same shape, and there is one concave on both sides. Grooves 24, 25, 26°27, 28', and 29 are provided. 30 to 33 are coils. in this way,
Having the same shape has the advantage that the core can be molded on one surface.

What is shown in FIG. 4 is the structure of a multi-channel rotary transformer, and FIG. 4 shows a four-channel rotary transformer. In other words, in the case of multi-channel, it is constructed by stacking cores of the same shape in many layers, and the flat ferrite cores 35, 36 .
36 and 37 degrees, 37 and 38, and 38 and 39 are arranged with a constant gap around the cylinder axis 23, forming a combination of channels. In this way, even in the case of multiple channels, ferrite cores of the same shape can be used, making it easy to standardize ferrite cores.

Effects of the Invention As described above, according to the present invention, the balance of inductance values can be made equal even when there are multiple channels, and the balance between each channel of a rotary transformer can be improved.

Furthermore, since the disk-shaped ferrite cores have the same shape, mass production is possible.

This solves the conventional problem of changing the shape of the core due to an increase in the number of channels, and standardization becomes possible.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional rotary transformer, FIG. 2 is a sectional view of a rotary transformer according to a first embodiment of the present invention, and FIG. 4.4 is a cross-sectional view showing a rotary transformer for multiple channels, in which case the rotary transformer is for four channels. 12.14... Stator core, 13... Rotor core, 15, 16, 17.18... Coil groove, 19.20, 21. 22... Coil, 23
...Cylinder axis, 24, 25, 26, 27, 2
8.29・・・Concave groove, 3○; 31.32.33・
...Coil, 34.35.36.37.38...
...Flat-shaped ferrite core. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure 2.9

Claims (1)

[Claims] A rotor core on the rotating side and a stator core on the stationary side are made of a disk-shaped ferrite core. A groove is provided on one or both sides of the disk-shaped ferrite core, and the rotor core and stator core with coils inserted into this groove can be A rotary transformer characterized by stacking several floors with a certain gap and placing them around the cylinder axis.