JPH0896289A - Signal transmitter - Google Patents

Abstract

PURPOSE: To provide a signal transmitter capable of transmitting high frequency signal between a rotor and a fixed part and having long service life. CONSTITUTION: A metallic shaft 1 is constituted so as to be rotated together with a rotor not shown in the figure and fixed through the center part of a cylindrical insulating layer 2. The layer 2 is divided into two areas by three shield discs 8. Rotor part electrodes 3a, 3b are formed on the outer peripheral side faces of the layer 2. Stator part electrodes 5a, 5b are arranged oppositely to the electrodes 3a, 3b through a fine distance gap 4. The electrodes 5a, 5b are fixed to an unrotatable stator part 7 through insulating layers 6a, 6b. The three shield discs 8 suppress electromagnetic interference between two divided areas and the external. Signals are transferred by electrostatic coupling between the electrodes 3a, 3b and the electrodes 5a, 5b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a signal transmission device, and more particularly to a signal transmission device for transmitting signals (including electric power) between a rotating body and a fixed portion in a contactless manner.

[0002]

2. Description of the Related Art Conventionally, a slip ring attached to a rotor of a motor or a generator has been known as a signal transmission device for transmitting a signal (including electric power: the same applies hereinafter) between a rotating body and a fixed portion. ing. This slip ring has a structure in which a signal from the rotor is taken out by metal contact.

A rotary transformer is conventionally known as a signal transmission device for transmitting a signal between a rotating body and a fixed portion in a non-contact manner. In this structure, a ring-shaped coil provided in a rotating body and a ring-shaped coil provided in a fixed portion are arranged in close proximity to each other, and signals are transmitted and received by electromagnetic coupling.

[0004]

However, since the slip ring has a sliding portion utilizing metal contact, noise occurs due to fluctuations in its contact resistance during rotation, and there is a problem in extracting a weak signal. is there. Also, the slip ring
Since the sliding parts are worn out, the life is short and there is a problem of reliability. Therefore, it is unsuitable to be installed in equipment such as equipment equipped with artificial satellites that has long life and high reliability is strictly required. .

On the other hand, the rotary transformer has the advantage that it has a longer life and higher reliability than the slip ring because it can send and receive signals between the rotating body and the fixed portion in a non-contact manner, but it uses electromagnetic coupling. Therefore, there is a problem in high frequency signal transmission.

The present invention has been made in view of the above points, and an object of the present invention is to provide a signal transmission device capable of transmitting a high-frequency signal between a rotating body and a fixed portion and having a long life. .

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a shaft that rotates together with a rotating body, and a cylindrical insulating member that is fixed through the center of the shaft and rotates integrally with the shaft. Layer, a rotor part electrode that is formed on the outer peripheral side surface of the insulating layer and rotates integrally with the shaft, and transmits and receives a signal to and from the rotating body; The configuration has a stator electrode and a stator to which the stator electrode is fixed.

The insulating layer according to the present invention has a surface in a direction orthogonal to the axial direction of the shaft, and is divided into a plurality of regions by three or more shield discs whose central portions are fixed through the shaft or the insulating layer. The rotor electrode is formed in each of the plurality of regions, and the plurality of stator electrodes are provided so as to face each rotor electrode of the plurality of regions in close proximity to each other.

[0009]

In the present invention, since the rotor electrode and the stator electrode are arranged close to each other and facing each other, signals can be transmitted and received between the rotor electrode and the stator electrode by electrostatic coupling. Also, the rotor electrode is provided in each of the plurality of regions where the insulating layer is divided by the shield disk,
Further, when the stator electrodes are provided corresponding to the respective rotor electrodes, it is possible to separately perform signal transmission by electrostatic coupling between the plurality of rotor electrodes and the plurality of stator electrodes.

[0010]

Next, an embodiment of the present invention will be described. 1 is a side view of an embodiment of the present invention, and FIG. 2 is a sectional view taken along line II-II of FIG. In both figures, the same components are designated by the same reference numerals.

In both figures, a metallic shaft 1 is configured to rotate together with a rotating body (not shown), and is fixed through the center of a cylindrical insulating layer 2. The insulating layer 2 is divided into two regions by three shield discs 8 whose center is penetrated and fixed by the insulating layer 2 or the shaft 1 so that the surface orthogonal to the axial direction of the shaft 1 is the surface.

Rotor electrodes 3a and 3b are formed on the outer peripheral side surfaces of the two divided regions of the insulating layer 2, respectively. The stator electrodes 5a and 5b are arranged to face the rotor electrodes 3a and 3b, respectively, with a gap 4 having a minute distance therebetween. Further, the stator portion electrodes 5a and 5b are fixed to the non-rotating stator portion 7 via the insulating layers 6a and 6b.

Therefore, the insulating layer 2, the rotor electrodes 3a and 3b, and the shield disk 8 rotate integrally with the shaft 1,
The stator electrodes 5a and 5b, the insulating layers 6a and 6b, and the stator 7 are fixed and do not rotate. Further, the three shield disks 8 suppress electromagnetic interference between the two divided areas and with the outside.

Next, the operation of this embodiment will be described.
Of the two-channel signals from the rotating body (not shown), the signal of the first channel is the rotor electrode 3 that rotates integrally with the shaft 1 that rotates in synchronization with the rotation of the rotating body.
The signal of the second channel is led to the same shaft 1
Is guided to the rotor portion electrode 3b which is rotating integrally with.

Since the rotor electrode 3a is opposed to the stator electrode 5a through the gap 4, the signal corresponding to the signal of the first channel introduced to the rotor electrode 3a by electrostatic coupling is the stator electrode 5a. Is induced by. Similarly, a signal corresponding to the second channel signal guided to the rotor electrode 3b by electrostatic coupling is induced in the stator electrode 5b.

The stator electrodes 5a and 5b are insulated from the stator 7 by insulating layers 6a and 6b, respectively, and the signals induced in the stator electrodes 5a and 5b are output from the stator electrodes 5a and 5b to the outside. It In this way, signals are transmitted from the rotating rotor electrodes 3a and 3b to the fixed stator electrodes 5a and 5b in a non-contact manner. Further, since the signal is transmitted by electrostatic coupling, it is suitable for transmitting a high frequency signal as compared with electromagnetic coupling.

In the above description, the case where signals are transmitted from the rotating rotor part electrodes 3a and 3b to the fixed stator part electrodes 5a and 5b in a non-contact manner is explained. When signals of two channels are externally input to 5b, signals corresponding to the input signals introduced to the stator electrodes 5a and 5b are electrostatically coupled to the rotor electrodes 3a and 3b in the same manner as above. The signals of the two channels, which are induced and are thereby induced, are supplied to the rotating body (not shown).

In the above embodiment, an example in which signals of two channels are transmitted has been described, but the number of regions in which the insulating layer 2 is divided in the axial direction of the shaft 1 by the shield disk 8 is N (N is 3 or more). Integer) makes it possible to transmit N-channel signals, and 1 if not divided.
Of course, it is also possible to transmit the signal of the channel.

[0019]

As described above, according to the present invention,
Since the rotor electrode and the stator electrode are placed close to each other and facing each other, and signals are transmitted and received between the rotor electrode and the stator electrode by electrostatic coupling, noise is generated due to metal contact compared to the slip ring. In addition, it can transmit signals with high quality, and since it has no sliding parts, it can have a long service life and can transmit far higher frequencies than a rotary transformer. It is suitable for being incorporated into equipment that requires a long life and high reliability.

Further, according to the present invention, the rotor electrode is provided in each of the plurality of regions where the insulating layer is divided by the shield disk, and the stator electrode is provided corresponding to each of the rotor electrodes. Since signals can be separately transmitted by electrostatic coupling between the plurality of rotor electrodes and the plurality of stator electrodes, multichannel signals can be transmitted simultaneously.

[Brief description of drawings]

FIG. 1 is a side view of an embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG.

[Explanation of symbols]

 1 Shaft 2, 6a, 6b Insulating layer 3a, 3b Rotor part electrode 4 Gap 5a, 5b Stator part electrode 7 Stator part 8 Shield disk

Claims (2)

[Claims] 1. A shaft that rotates together with a rotating body, a cylindrical insulating layer that is fixed through the center of the shaft and rotates integrally with the shaft, and a shaft that is formed on an outer peripheral side surface of the insulating layer. A rotor part electrode that rotates integrally with the rotor and transmits / receives a signal to / from the rotating body; a fixed stator part electrode that is arranged close to and spaced from the rotor part electrode; and the stator part electrode is fixed. A signal transmission device having a stator. 2. The insulating layer has a surface in a direction orthogonal to the axial direction of the shaft, and is formed into a plurality of regions by three or more shield discs whose central portions are fixed through the shaft or the insulating layer. It is characterized in that the rotor part electrode is formed in each of the plurality of regions, and the plurality of stator part electrodes are provided in close proximity to and facing the respective rotor part electrodes of the plurality of regions. The signal transmission device according to claim 1.