JPH0732098B2 - Rotating transformer - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used in a VTR device and relates to a rotary transformer for transmitting and receiving signals between a rotary magnetic head and a device without using a magnetic circuit. .

Configuration of Conventional Example and Problems Thereof This type of rotary transformer is constructed as shown in FIGS. 1 and 2. This rotary transformer is installed in the rotary drum part of the VTR and has the role of transmitting the signal of the rotary part of the video head to the main circuit.

In the figure, reference numeral 1 denotes a rotor in which a coil 3 is disposed in a winding groove 2a on the inner peripheral surface of a cylindrical core 2, and 4 denotes a winding groove 5a on the outer peripheral surface of a cylindrical core 5. This is a stator having a coil 6 arranged therein, and a rotor 1 is rotatably covered on a stator 4.

The relationship between the core and the coil in the stator of the conventional rotary transformer of this type is configured as shown in FIGS. In this shape, since the coil 6 is required to be aligned, it is manufactured by winding the coil 6 in advance and then passing the terminal lead 7 of the coil 6 under the coil 6. In this case, if the terminal lead 7 is pulled too strongly during the work, the alignment of the coil 6 is disturbed and becomes defective, and it is difficult to automatically wind the terminal lead 7 in terms of fixing the terminal lead 7, which significantly hinders automation. Was there.

OBJECT OF THE INVENTION The present invention was invented to eliminate the above-mentioned conventional drawbacks and facilitate automation of winding work, and an object of the present invention is to significantly improve winding workability. Is.

To achieve this object, the present invention provides a step between the winding groove and the terminal lead wiring groove, which is slightly wider than the wire diameter of the coil, in the portion of the core winding groove near the terminal lead wiring groove. It is provided with a notched groove that can be removed.

With this structure, at the beginning of the winding work, the coil is passed through the groove for the terminal lead and hooked in the cutout groove portion so as to be temporarily fixed and wound, so that the winding work can be automated.

Description of Embodiments One embodiment of the present invention will be described below with reference to FIGS. 5 and 6. The structure of the rotary transformer is substantially the same as that shown in FIG. 1 and FIG. 2, and since it has a characteristic on the stator side, the characteristic portion on the stator side will be described. As shown in FIG. 5, the winding groove of the cylindrical core 5
A notch groove 8 that is slightly wider than the wire diameter of the coil 6 is provided in a portion of 5a close to the terminal lead wiring groove 9. That is, the winding groove 5a is formed in a direction orthogonal to the terminal lead wiring groove 9,
Moreover, the terminal lead wiring groove 9 is formed deeper than the winding groove 5a, and the notch groove portion 8 slightly wider than the wire diameter of the coil 6 is formed in the portion of the winding groove 5a close to the terminal lead wiring groove 9. Are formed so as to eliminate the step between the winding groove 5a and the terminal lead wiring groove 9. Then, the terminal portion of the coil 6 is passed through the terminal lead wiring groove 9 and bent 90 ° in the notch groove 8 provided in the winding groove 5a to be temporarily fixed. After that, by performing a predetermined winding in the winding groove 5a, a series of operations is completed.

In the embodiments, the stator side has been described, but the same effect can be obtained by adopting the same configuration on the rotor side.

As described above, according to the present invention, in the winding work on the cylindrical core of the stator of the coaxial rotary transformer, the automated construction method by a series of continuous operations can be adopted, and the winding work by manual work can be performed. Compared with the above, the workability can be remarkably improved, a series of operations can be easily automated, and defects such as collapse of the wire ring can be prevented in the work after winding.

[Brief description of drawings]

1 is an exploded perspective view of a conventional rotary transformer, FIG. 2 is a sectional view of the same, and FIG. 3 is a side view of a stator portion of the transformer.
FIG. 4 is an enlarged view of an essential part of the transformer, FIG. 5 is an enlarged view showing an essential part of a rotary transformer according to an embodiment of the present invention, and FIG.
The figure is an enlarged view showing a state in which a winding is applied to the same portion. 5 ... Core, 5a ... Winding groove, 6 ... Coil, 8 ... Notch groove, 9 ... Terminal lead wiring groove.

Claims (1)

[Claims] 1. A rotor having a coil arranged in a winding groove on an inner peripheral surface of a cylindrical core and a stator having a coil arranged in a winding groove on an outer peripheral surface of a cylindrical core. A rotary transformer in which a cutout groove is provided in a portion of the winding groove near the terminal lead wiring groove, which is slightly wider than the coil wire diameter so as to eliminate a step between the winding groove and the terminal lead wiring groove.