JPH08162348A - Rotary transformer - Google Patents

Abstract

PURPOSE: To provide a rotary transformer having stabilized electric characteristics and also having less positional deviation of a coil in the coil groove of the core of the rotary transformer. CONSTITUTION: A coil groove 1 has the step-like formed cross-section, consisting of the deep coil groove 2 of the center part and the shallow coil groove 3 of the outer and the inner circumferential parts, and the coil 4 is fitted to the deep coil groove 2 of the center part of the coil groove.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coil winding structure of a rotary transformer used in a VTR.

[0002]

2. Description of the Related Art Conventionally, a rotary transformer of this type has a rotor transformer (hereinafter abbreviated as R transformer) 9 connected to a magnetic head side and a stator connected to a signal side as shown in a sectional view of FIG. It is configured by a transformer (hereinafter, abbreviated as S transformer) 10. The coil disposing annular groove of the rotary transformer core (hereinafter abbreviated as coil groove) has a structure in which the coil groove 8 of the R transformer 9 and the coil groove 8 of the S transformer 10 face each other. The width is equal. The number of turns of the coil 7 is generally set to be larger than that of the R transformer 9 for the purpose of transforming.

[0003]

However, in the R transformer, since the number of coil turns is smaller than that of the S transformer, the coil groove width of the core is larger than the coil turn width, which causes rattling, and When the coil 7 is inserted into the coil groove, the coil 7 is often displaced from the center of the coil groove of the core as shown in FIG. 2 and is fixed to one side, and the coil may be displaced in the coil groove. This has been a drawback of increasing variations in the leakage inductance, which is the electrical characteristics of the transformer, and the transmission characteristics.

In order to eliminate the above-mentioned drawbacks, a technical object of the present invention is to provide a rotary transformer having a stable electric characteristic with a structure in which the coil groove of the core is not displaced. Is.

[0005]

SUMMARY OF THE INVENTION The present invention has a structure in which a section of a ring of an annular coil groove of a rotary transformer core is deep in the central portion and shallow in the outer peripheral portion and the inner peripheral portion, and has a stepwise structure.
The coil is configured to fit exactly in the deep groove at the center of the coil groove of the core. With this configuration, the coil is positioned and fixed in the central portion of the coil groove of the core.

[0006]

Since the number of coil windings of the R transformer is smaller than that of the S transformer, the coil winding width of the R transformer is small, and the coil groove widths of both the R transformer and the S transformer are equal. It moves and is biased and fixed. Therefore, the coil groove has a two-step structure, the central portion is deepened, the groove width of the deep portion is adjusted to the coil width of the R transformer, and both sides are shallowed, so that the coil is fitted and fixed in the deep portion of the central portion. It

[0007]

The present invention will be described with reference to the drawings.

FIG. 1 shows an embodiment of a rotary transformer of the present invention. A coil groove 1 is a deep coil groove 2 provided in the central portion of the coil groove, and shallow coil grooves 3 on both inner and outer peripheral sides of the deep groove. It consists of. Coil 4 in deep coil groove 2
Is the size that fits exactly. In FIG. 1, the coil groove of the S transformer core has a staircase structure, and the coil groove 1 of both the R transformer core and the S transformer core has a staircase structure because of a design requirement.

By adopting the stepped groove structure as described above, the coil is not fixed in one side in the coil groove of the transformer.

[0010]

As described above, according to the present invention, the coil is not displaced in the coil groove of the core,
Since it is fixed at a predetermined position, it is possible to provide a rotary transformer having the advantage that the electric characteristics are stable.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a rotary transformer of the present invention.

FIG. 2 is a cross-sectional view showing a conventional rotary transformer.

[Explanation of symbols]

 1,8 Coil groove (of core) 2 Deep coil groove (of core) 3 Shallow coil groove (of core) 4,7 Coil 5,9 Rotor transformer core 6,10 Stator transformer core

Claims (1)

[Claims] 1. A rotary transformer characterized in that an annular groove for arranging a coil provided in a flat plate type rotary transformer core has a stepwise cross-sectional shape.