JP2510417Y2 - Wire-wound rotation detector - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wire-wound rotation detector, and more particularly to a novel improvement for obtaining a thin and compact structure by a thin magnetic shield plate.

[0002]

2. Description of the Related Art There are various wound-type rotation detectors of this type that have been used in the past, and a typical one of them is disclosed, for example, in Japanese Utility Model Publication No. 62-168616. The magnetic shield structure used in this configuration has, for example, a rotation detection unit 2 and a rotation transformer unit 3 in a casing 1 as shown in FIG.
The rotation detecting portion 2 is provided on the inner wall 1a of the casing 1 and the rotation detecting portion rotor 7 which is provided on the rotor 4 and includes the rotation detecting portion rotor coil 5 and the rotation detecting portion rotor core 6. The rotation detecting section stator 10 includes a rotation detecting section stator coil 8 and a rotation detecting section stator core 9.

The rotary transformer unit 3 is provided on the rotor 4 and includes a rotary transformer rotor coil 11 and a rotary transformer rotor core 12, and a rotary transformer unit rotor 13.
The casing 1 includes a rotary transformer stator 16 provided on the inner wall 1a of the casing 1 and includes a rotary transformer stator coil 14 and a rotary transformer stator core 15.

A shield rotor collar 20 provided on the outer periphery of the rotor 4 and a shield stator collar 21 provided on the inner wall 1a of the casing 1 are provided between the rotation detecting portion 2 and the rotation transformer portion 3. As a result, a magnetic shield between the rotation detector 2 and the rotation transformer 3 is achieved.

[0005]

Since the conventional wire-wound type rotation detector is constructed as described above, the following problems exist. That is, since the shield rotor collar and the shield stator collar provided between the rotation detection unit and the rotation transformer unit are both formed of collars having a considerable thickness in the axial direction of the rotation shaft, the rotation detection unit The distance D between the rotary transformer and the rotary transformer is inevitably large, and the high accuracy required for this type of rotation detector,
It was impossible to achieve miniaturization and cost reduction. The present invention aims to solve the above problems.

[0006]

In the wire-wound type rotation detector according to the present invention, a rotation detection signal from a rotation detection unit provided in a casing is passed through a rotation transformer unit including a rotation transformer stator and a rotation transformer rotor. In the wire-wound rotation detector adapted to be taken out to the outside, a ring-shaped shield plate is provided on an end surface orthogonal to the axial direction of the rotation transformer stator core of the rotation transformer stator and the rotation transformer rotor core of the rotation transformer rotor, and the ring-shaped shield plate. Is a structure in which synthetic films are provided on both sides of a copper foil, and an adhesive portion is formed on one of the synthetic films.

[0007]

In the wire-wound rotation detector according to the present invention, since the ring-shaped shield plate is provided on the end faces of the rotary transformer low-cost core and the rotary transformer stator core which are orthogonal to the axial direction, the distance between the rotation detector and the rotary transformer is reduced. D
Can be very small and can be close to zero, resulting in an ultra-thin miniature rotation detector.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the wire-wound rotation detector according to the present invention will be described in detail below with reference to the drawings. It should be noted that the same or equivalent parts as those of the conventional example will be described using the same reference numerals. 1 to 3 show a wire-wound rotation detector according to the present invention, FIG. 1 is a sectional view, FIG. 2 is a plan view showing a main part of FIG. 1, and FIG. 3 is a sectional view of FIG. .

A rotation detector 2 and a rotation transformer 3 are provided in the casing 1. The rotation detector 2
Is a rotation detecting rotor 7 provided on the rotor 4 and includes a rotation detecting rotor coil 5 and a rotation detecting rotor core 6.
And a rotation detection unit stator 10 which is provided on the inner wall 1a of the casing 1 and includes a rotation detection unit stator coil 8 and a rotation detection unit stator core 9.

The rotary transformer section 3 is provided on the rotor 4 and includes a rotary transformer rotor coil 11 and a rotary transformer rotor core 12, and a rotary transformer section rotor 13.
The casing 1 includes a rotary transformer stator 16 provided on the inner wall 1a of the casing 1 and includes a rotary transformer stator coil 14 and a rotary transformer stator core 15.

A pair of annular shield plates 30 are provided on a pair of end faces 13a, 13b orthogonal to the axial direction A of the rotary transformer rotor core 12, and a pair of annular shield plates 30 orthogonal to the axial direction A of the rotary transformer stator core 15. End face 1
A pair of ring-shaped shield plates 31 is provided on 5a and 15b.

The ring-shaped shield plates 30 and 31 are constructed as shown in FIGS. 2 and 3, and have a ring-shaped thin copper foil 40, a synthetic film 41 made of a polyimide film provided on both sides of the copper foil 40, and the same. One synthetic film 41
And an adhesive portion 42 such as an adhesive or a double-sided tape formed on the surface of, and is adhered via this adhesive portion 42.

Therefore, since the ring-shaped shield plates 30 and 31 are extremely thin, the distance D between the rotation detection unit 2 and the rotation transformer unit 3 can be made extremely small, for example, close to zero. The configurations of the ring-shaped shield plates 30 and 31 described above are not limited to those described above, and other configurations may be used.

[0014]

Since the winding type rotation detector according to the present invention is constructed as described above, the following effects can be obtained. That is, since the magnetic shield is thin and is attached to the rotary transformer unit, the distance D between the rotation detecting unit and the rotary transformer unit can be greatly reduced, and a small and thin rotary detector can be obtained. .

[Brief description of drawings]

FIG. 1 is a sectional view showing a wire-wound rotation detector according to the present invention.

FIG. 2 is a plan view of a main part of FIG.

3 is a cross-sectional view of FIG.

FIG. 4 is a cross-sectional view showing a conventional wire-wound rotation detector.

[Explanation of Codes] 1 casing 2 rotation detection part 3 rotation transformer part 12 rotation transformer rotor core 13 rotation transformer rotor 15 rotation transformer stator core 16 rotation transformer stator A axial direction 30 ring-shaped shield plate 31 ring-shaped shield plate 40 copper foil 41 synthetic film 42 adhesive Department

Claims (1)

(57) [Scope of utility model registration request] 1. A rotation transformer stator (1) receives a rotation detection signal from a rotation detection section (2) provided in a casing (1).
6) and a rotary transformer rotor (13) through a rotary transformer section (3), in the winding type rotation detector to be taken out, the rotary transformer stator core (15) of the rotary transformer stator (16) and the Rotating Transformer Rotor (13)
An end face (15a, 15b, 13a, 13b) orthogonal to the axial direction (A) of the rotary transformer rotor core (12) is provided with a ring-shaped shield plate (30, 31), and the ring-shaped shield plate (30, 31) is Synthetic film (41) is provided on both sides of the copper foil (40), and each synthetic film (41)
A wire-wound type rotation detector characterized in that the adhesive portion (42) is formed on either one of the above.