JPH10116744A - Rotary transformer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary transformer which has a cross-talk preventive effect which is nearly equal to that of a rotary transformer in which short rings are arranged at a core on the side of a rotor or at both cores on the side of a stator in conventional cases even when a short ring is arranged at one out of a core on the side of a rotor and a core on the side of a stator. SOLUTION: In a rotary transformer 1 of a type which is not provided with a groove, the height of a short ring 10 which is installed at a core 4 on the side of a rotor or at a core 7 on the side of a stator is extended up to height areas at coil parts 5, 6 installed at a core on the other side. In addition, in a rotary transformer 11 of a type which is provided with a groove, the height of a short ring 27 which is installed at a core 14 on the side of a rotor or at one core 21 out of cores 21 on the side of a stator is extended into the groove 16 which is formed in a core 14 on the other side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a planar opposed rotary transformer used for transmitting a signal between a rotor and a stator.

[0002]

2. Description of the Related Art In a magnetic recording / reproducing apparatus which records or reproduces a signal on a recording medium such as a magnetic tape in a state where a magnetic head rotates, such as a magnetic recording apparatus (VTR), a rotating magnetic head is used. In order to transmit and receive a signal between a peripheral circuit and a peripheral circuit, a planar opposed rotary transformer is used.

[0003] In a plane-facing rotary transformer, a plane of a rotor core and a plane of a stator core are literally opposed to each other, and a coil portion and a short ring are arranged on the plane of the rotor core and the plane of the stator core. It is constituted by doing. The short ring is
This is to prevent crosstalk (noise generated by a signal jumping from a signal source channel to a channel adjacent thereto).

[0004] There are two types of planar facing rotary transformers, one of which has no groove and the other of which has a groove.

FIG. 2A shows an example of a grooveless type rotary transformer. The above rotary transformer 101
Has a rotor 102 and a stator 103. In the rotor 102, the first and second coil portions 105 and 106 are arranged on the plane (the surface facing the stator) of the core 104 on the rotor side.
And a short ring 107 is arranged between the coil portions 105 and 106 of FIG. Similarly to the rotor 102, the stator 103 has a third and fourth coil portions 109 on the plane of the core 108 on the stator side facing the first and second coil portions 105 and 106 on the rotor side. , 110, and the short ring 1 facing the rotor side short ring 107 between the third and fourth coil portions 109, 110.
11 are arranged.

The first, second, third and fourth coil units 1
The height H ₁ and the height H ₂ of the short rings 107 of 05,106,109,110 is set substantially to the same value. As indicated by the two-dot chain line, the short rings 107 and 111 cause the noise N of the first and third coil portions 105 and 109 to jump into the second and fourth coil portions 106 and 110. Or vice versa
The noise of the fourth coil units 106 and 110 is prevented from jumping into the first and third coil units 105 and 109.

FIG. 2B shows an example of a rotary transformer 101 of a grooved type. In the grooved type rotary transformer 101, the core 10 on the rotor side is used.
4 are provided with first to third grooves 112 to 114, and the first and second coil portions 105 and 106 are arranged in the first and third grooves 112 and 114, respectively. The short ring 107 is disposed in the second groove 113. Also, on the plane of the stator-side core 108, similarly to the rotor-side core 104, the first to third grooves 115 to 1-1 are formed.
17 are provided, and the first and third grooves 115, 1 are provided.
The third and fourth coil portions 109 and 110 are arranged in the groove 17, and the short ring 111 is arranged in the second groove 116.

As shown by the two-dot chain line, the short rings 107 and 111 reduce the noise N of the first and third coil portions 105 and 109 to the side of the second and fourth coil portions 106 and 110. To prevent them from jumping into.

[0009]

The above-mentioned rotary transformer has a relatively simple basic structure, and has a history of more than 30 years since the invention was invented. There is already a feeling of tightness, and at present, cost competition is incurring how to provide a rotary transformer at a low cost. Therefore, it is desired to reduce the cost of parts and the number of assembly steps.

Therefore, as shown in FIGS. 3A and 3B, the short ring 107 is moved from the core 104 on the rotor side.
In other words, the short ring 107 is not disposed on the core 104 on the rotor side, and the core 108 on the stator side is removed.
A non-grooved or grooved rotary transformer 101 in which a short ring 111 is disposed only on the core (or a short ring is disposed only on the rotor core 104) is also used. However, there is a problem that the crosstalk prevention effect is reduced by half as compared with a rotary transformer in which short rings are arranged on both the rotor side core 104 and the stator side core 108.

According to the present invention, even when a short ring is arranged on one of the core on the rotor side and the core on the stator side, the rotary shaft in which the short ring is arranged on both the conventional core on the rotor side and the core on the stator side is provided. A rotary transformer having substantially the same crosstalk prevention effect as that of a transformer can be provided.

[0012]

SUMMARY OF THE INVENTION The present invention is directed to a planar opposed rotary transformer having a rotor and a stator. In a non-grooved type rotary transformer, either one of the core on the rotor side or the core on the stator side is used. By extending the height of the provided short ring into the height area of the coil portion provided on the other core, or in the case of the grooved type, either the core on the rotor side or the core on the stator side By extending the height of the short ring provided on the other core into the groove provided on the other core, the same crosstalk prevention effect as the short ring provided on the rotor side and the stator side on the one short ring is provided. I gave it up.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a planar facing type rotary transformer according to the present invention will be described with reference to FIGS. 1 (A) and 1 (B).

FIG. 1A is a sectional view of a main part of a rotary transformer 1 of a grooveless type. The rotary transformer 1 includes a rotor 2 and a stator 3.
The rotor 2 includes a rotor-side core 4 and first and second coil portions 5 and 6 provided on a plane of the core 4 (a surface facing a stator-side core 7 described later). .
It said first, second coil portion 5, 6 is formed at a height H _1. The stator 3 includes a core 7 on the stator side.
And provided on the plane of the core 7 (the surface facing the rotor-side core 4) so as to face the first and second coil portions 5 and 6 provided on the rotor-side core 4. And third and fourth coil portions 8 and 9 and a short ring 10 arranged between the third and fourth coil portions 8 and 9.

The core 4 on the rotor side and the core 7 on the stator side are arranged at a predetermined interval δ ₁ . It said third and fourth coil sections 8 and 9, the first, is substantially formed at the same height between H ₂ height H ₁ of the second coil portion 5,6. In addition, the short ring 10 has a height H _{3 at} which an upper end portion enters the height area of the first and second coil portions 5 and 6 on the rotor side and does not contact the plane of the core 4 on the rotor side. Is formed. (Δ ₁ > H ₃ > δ ₁ −H ₁ ).

The rotary transformer 1 shown in FIG. 1A has the above-described configuration. Therefore, the short ring 1
0 acts in substantially the same manner as the short ring 107 provided on the conventional rotor-side core shown in FIG. 2A, as if it were a rotor-side core 4 and a stator-side core 7.
Has the same crosstalk prevention effect as when a short ring is provided in both of them.

FIG. 1B is a sectional view of a main part of a rotary transformer 11 of a grooved type. The rotary transformer 11 includes a rotor 12 and a stator 13. The rotor 12 has a core 14 on the rotor side.
And first to third grooves 15 to 17 provided on a plane of the core 14 (a surface facing the core 21 on the stator side), and provided in the first and third grooves 15 and 17. First and second coil units 18 and 19 are provided. The first to third grooves 15 to 17 are formed at a depth D. The first,
The height H ₁ of the second coil portions 18 and 19 is formed smaller than the depth D of the first and third grooves 15 and 17.
When attached to these grooves 15 and 17 with an adhesive or the like, they do not protrude from the plane of the core 14 on the rotor side.

The stator 13 includes a core 21 on the stator side and a flat surface of the core 21 (the core 1 on the rotor side).
4 to 6 grooves 22 to 24 provided in a state facing the first to third grooves 15 to 17 provided in the rotor-side core 14, There are provided third and fourth coil portions 25 and 26 attached to the fourth and sixth grooves 22 and 24 with an adhesive or the like, and a short ring 27 attached to the fifth groove 23.

The core 14 on the rotor side and the core 21 on the stator side are arranged at a predetermined interval δ ₂ . The fourth to sixth grooves 22 to 24 are formed at substantially the same depth D as the first to third grooves 15 to 17 provided in the core 14 on the rotor side. 4 of the coil portion 25, 26 first be provided in the core 14 of the rotor side, substantially be formed at the same height between H ₂ height H ₁ of the second coil portions 18 and 19, the fourth, Sixth groove 22, 2
When it is mounted in the core 4, it does not protrude from the plane of the core 21 on the stator side.

The short ring 27 has a height H _{3 at} which the upper end thereof enters the second groove 16 of the rotor-side core 14 and does not contact the bottom surface of the second groove 16.
(2D + δ ₂ > H ₃ > D + δ ₂ ).

The rotary transformer 1 shown in FIG. 1B has the above-described configuration. Therefore, the short ring 2
The tip of 7 acts in substantially the same manner as the short ring 107 provided on the conventional rotor-side core shown in FIG. 2 (B), as if it were on both the rotor-side core 14 and the stator-side core 21. This has the same crosstalk prevention effect as the provision of the short ring.

In the embodiment shown in the drawings, the case where the short ring is provided on the core on the stator side is shown, but the short ring may be provided on the core on the rotor side.

[0023]

The rotary transformer of the present invention has the following effects.

(1) In the rotary transformer according to claims 1 and 3, the short-circuiting ring provided on one of the core on the rotor side and the core on the stator side allows both the conventional core on the rotor side and the core on the stator side to be connected. The same crosstalk prevention effect as provided with the short ring can be obtained, and the cost of the rotary transformer can be reduced by reducing the parts cost and the number of assembly steps.

(2) In the rotary transformer according to claims 2 and 4, since the short ring is provided on the core on the stator side, the tip of the short ring enters the height area of the coil provided on the core on the rotor side. As described above, even when the mass of the short ring is increased, for example, by increasing the thickness of the short ring, the rotor can be rotated regardless of the mass of the short ring.

[Brief description of the drawings]

FIG. 1A is a cross-sectional view of a main part of a rotary transformer (without grooves). FIG. 1B is a cross-sectional view of a main part of a rotary transformer (with grooves).

FIG. 2A is a cross-sectional view of a conventional example (without grooves). FIG. 2B is a cross-sectional view of a conventional example (with grooves).

3A is a cross-sectional view of a conventional example (without grooves). FIG. 3B is a cross-sectional view of a conventional example (with grooves).

[Explanation of symbols]

1 ... Rotary transformer (without groove), 2 ... Rotor, 3 ... Stator, 4 ... Rotor side core, 5,6 ...
1st, 2nd coil parts, 7 ... core on the stator side, 8,
9: third and fourth coil portions, 10: short ring, 1
DESCRIPTION OF SYMBOLS 1 ... Rotary transformer (grooved type), 12 ... Rotor, 13 ... Stator, 14 ... Core on rotor side, 1
5 to 17: first to third grooves, 18, 19: first and second coil portions, 21: core on the stator side, 22 to 24: fourth to sixth grooves, 25, 26: third , A fourth coil unit, 2
7 ... Short ring.

Claims (4)

[Claims] 1. A flat-type rotary transformer having a rotor and a stator, wherein a short ring provided on one of the rotor-side core and the stator-side core has a height of a coil portion provided on the other. A rotary transformer characterized by invading the area. 2. The rotary transformer according to claim 2, wherein the short ring is provided only on the stator. 3. The rotary transformer according to claim 1, wherein the short ring provided on one of the rotor and the stator penetrates into a groove for the short ring provided on the other. 4. The rotary transformer according to claim 3, wherein the short ring is provided only on the stator.