JPH113828A - Non-contact transmitter for rotary power and signal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stabilize the signal transmitting efficiency of a non-contacting rotary transmitter for power and signal by arranging the gap between the facing surfaces of a core for transmitting power in a parallel plane which is shifted from the gap between the facing surfaces of a core for transmitting signal in the axial direction. SOLUTION: When electric power is supplied to a primary-side power transmission coil 6 and an electric signal is supplied to a primary-side signal transmission coil 12 for transmitting signal, magnetic fluxes are generated from the coils 6 and 12. The magnetic fluxes respectively induce voltages in a secondary- side power transmission coil 26 and a secondary-side signal transmission coil 32, and power transmission and electric signal transmission are performed in non-contacting states. Part of the magnetic flux generated from the coil 6 leaks toward the center of the coil 6, namely, toward a signal section through a gap G. However, since a difference H is formed between a power section and the signal section, the magnetic flux leaking toward the signal section is intercepted at the difference H and does not reach the gap (g) of the signal section. Consequently, the magnetic flux generated from the coil 12 is received by the coil 32 without being affected by noise.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-contact rotary power / signal transmission apparatus for transmitting electric power and electric signals from a primary transformer to a secondary transformer without contact, and more particularly to a rotary power / signal non-contact transmission apparatus. The present invention relates to a device for reducing an influence of a leaked magnetic flux on an electric signal.

[0002]

2. Description of the Related Art As a conventional rotary power / signal non-contact transmission device of this kind, a power transmission core and a signal transmission core are provided in a pair of flat cylindrical transformers opposed to each other with an air gap therebetween. There was a rotary transformer concentrically mounted. However, in such a conventional rotary power / signal non-contact transmission device, since the power transmission core and the signal transmission core are shared, the leakage magnetic flux leaking from the power transmission coil interlinks with the signal transmission coil. Therefore, there is a problem of causing noise and transmitting an erroneous signal.

In order to solve this problem, the present applicant has previously proposed an improved non-contact rotary power / signal transmission device. It has a flat cylindrical shape with a power transmission core containing a power transmission coil in a ring-shaped groove and a signal transmission core containing a signal transmission coil in another ring-shaped groove. In a rotary power / signal non-contact transmission device in which a pair of transformers are opposed to each other with an air gap therebetween, the power transmission core and the signal transmission core are magnetically separated from each other. And a power transmission core and a signal transmission core.

FIG. 3 shows the prior invention. In the figure, a primary transformer T11 and a secondary transformer T12 are arranged to face each other with an air gap G therebetween, and electric power and electric signals are transmitted from the primary transformer T11 to the secondary transformer T12 without contact. I have. The primary transformer T11 is a frame 5 formed of a nonmagnetic material such as aluminum in a cylindrical shape.
2 and a ring-shaped groove 53 formed in the frame 52.
A ring-shaped primary-side power transmission core 54 fitted inside;
A primary-side power transmission coil 56 housed in a ring-shaped groove 55 formed in the primary-side power transmission core 54 and a primary fit in a circular recess 57 formed in the center of the frame 52. Side signal transmission core 58 and a ring-shaped groove 61 formed in the primary side signal transmission core 58.
And a secondary signal transmission coil 62.

The secondary transformer T12 has a cylindrical frame 71 made of a non-magnetic material such as aluminum and a ring-shaped secondary power transmission fitted in a ring-shaped groove 73 formed in the frame 71. Core 74, a secondary-side power transmission coil 76 housed in a ring-shaped groove 75 formed in the secondary-side power transmission core 74, and a frame 71.
And a secondary-side signal housed in a ring-shaped groove 81 formed in the secondary-side signal transmission core 78. And a transmission coil 82.

Therefore, the primary side power transmission coil 56
When electric power is supplied to the primary side signal transmission coil 62 and an electric signal is supplied to the primary side signal transmission coil 62, a magnetic flux is generated from the coil 56 and the coil 62, and a voltage is induced in the secondary side power transmission coil 76 by the magnetic flux, Also, the secondary side signal transmission coil 82
, And transmission of electric power and electric signals is performed in a contactless manner.

[0007]

However, the prior art as described above has the following problems. That is, regarding the magnetic flux generated from the primary-side power transmission coil 56, a part of the magnetic flux is transmitted through the gap G and leaks toward the center, and is superimposed as noise on the magnetic flux generated from the secondary-side signal transmission coil 82. This is a problem that transmission efficiency of electric signals is deteriorated. Moreover, the leakage magnetic flux tends to deteriorate the S / N ratio of the transmitted electric signal in response to the increase in the amount of transmitted power. SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and reduces noise superimposed on an electric signal transmission coil regardless of the magnitude of power transmission, thereby stabilizing signal transmission efficiency. An object of the present invention is to provide a contact transmission device.

[0008]

According to the present invention, there is provided a power transmission core in which a power transmission coil is housed in a ring-shaped groove, and a signal transmission in another ring-shaped groove. Rotary power / signal non-contact transmission device in which a pair of flat cylindrical transformers are arranged concentrically in a non-magnetic frame with a signal transmission core containing a coil for use therein and are opposed to each other via an air gap. Wherein the gap on the opposing surface of the power transmission core is arranged on a parallel surface that is shifted in the axial direction from the gap on the opposing surface of the signal transmission core. That is, in FIG. 1, the gap G on the opposing surface of the primary power coil 6 and the secondary power coil 26, the primary signal coil 12 and the secondary signal coil 32, And a gap H on the opposing surface of FIG.

According to the above configuration, the primary side power coil 6
A gap G on a surface facing the secondary power coil 26,
The gap g on the opposing surface of the primary signal coil 12 and the secondary signal coil 32 is not continuous on the same horizontal plane,
Since the difference H is formed between the gaps G and g, the leakage magnetic flux generated in the gap G due to the power transmission is shielded by the difference H and does not leak to the gap g, and the magnetic flux generated corresponding to the electric signal Will not be superimposed as noise.

According to the second aspect of the present invention, a power transmission core containing a power transmission coil in a ring-shaped groove and a signal transmission coil containing a signal transmission coil in another ring-shaped groove. A rotary power / signal non-contact transmission device in which a pair of flat cylindrical transformers in which a pair of cores are concentrically arranged in a non-magnetic frame and are opposed to each other via an air gap; And a gap formed between the non-magnetic frame and the signal transmission core and the opposing surface of the non-magnetic frame is disposed on a parallel surface that is axially shifted from the gap of the opposing surface of the power transmission core. It is assumed that. That is, in FIG. 2, the primary side power coil 6 and the
A partition wall 2b is provided between a gap G on a surface facing the secondary power coil 26 and a gap g on a surface facing the primary signal coil 12 and the secondary signal coil 32.

A partition 2 is provided between the gap G and the gap g.
In the configuration where b is formed, the primary signal coil 12 and the secondary signal coil 32 are surrounded by the partition wall 2b, so that they are shielded. Can be.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of a rotary power / signal non-contact transmission device (hereinafter abbreviated as "transmission device") to which the present invention is applied will be described in detail.
FIG. 1 is a sectional view showing the configuration of the transmission device.

The transmission device 1 is connected to an upper secondary transformer T2 via a gap G from a lower primary transformer T1 shown in FIG.
In addition, power and electric signals are transmitted in a non-contact manner and simultaneously, and the overall shape is cylindrical. The primary transformer T1 includes a frame 2 formed of a non-magnetic material such as aluminum, a ring-shaped primary power transmission core 4 fitted in a ring-shaped groove 3 formed in the frame 2, A primary-side power transmission coil 6 housed in a ring-shaped groove 5 formed in the primary-side power transmission core 4, and fitted into a circular recess 7 formed in the center of the frame 2.
Primary-side signal transmission core 8 and primary-side signal transmission core 8
And a primary-side signal transmission coil 12 housed in a ring-shaped groove 11 formed in the above.

The secondary transformer T2 is composed of a frame 21 made of a non-magnetic material such as aluminum and the like.
1. A ring-shaped secondary power transmission core 24 fitted in a ring-shaped groove 23 formed in 1 and a ring-shaped secondary power transmission core 24 formed in the ring-shaped groove 25 formed in the secondary-side power transmission core 24.
A secondary-side power transmission coil 26, a secondary-side signal transmission core 28 fitted in a circular recess 27 formed in the center of the frame 21, and a ring-shaped portion formed in the secondary-side signal transmission core 28; And the secondary-side signal transmission coil 32 housed in the groove 31 of FIG.

Incidentally, a convex portion 2a is formed at the center of the frame 2, and a central portion of the frame 21 is formed at the concave portion 21a, and the convex portion 2a is fitted into the concave portion 21a. It has become. Therefore, the power transmission section in which the primary and secondary power transmission cores 4 and 24 face the primary and secondary power transmission coils 6 and 26, and the primary and secondary signal transmission cores 8 , 28 and the signal transmission portion facing the primary and secondary signal transmission coils 12, 32, a difference H is formed, and the positions of the air gaps G, g are mutually shifted in the axial direction. Are arranged on parallel planes shifted from each other.

Next, the operation of the transmission device 1 will be described.
When power is supplied to the primary-side power transmission coil 6 and an electric signal is supplied to the primary-side signal transmission coil 12, a magnetic flux is generated from the coil 6 and the coil 12. With this magnetic flux,
A voltage is induced in the secondary-side power transmission coil 26 and a voltage is induced in the secondary-side signal transmission coil 32, so that power and electric signals are transmitted without contact. Here, with respect to the magnetic flux generated from the primary-side power transmission coil 6, a part of the magnetic flux leaks in the center direction, that is, in the signal portion direction, through the gap G. However, in the present embodiment, since the difference H is formed between the power unit and the signal unit, the magnetic flux leaking in the signal unit direction is cut off at the difference H and does not reach the gap g of the signal unit. Therefore, the signal portion is magnetically shielded as to the leakage magnetic flux of the power portion, and the leakage magnetic flux does not overlap as a noise with the magnetic flux generated from the primary signal transmission coil 12. As a result, the magnetic flux generated from the coil 12 is received by the secondary-side signal transmission coil 32 without being affected by noise, and accurate signal transmission is performed.

In the above configuration, the convex portion 2a is formed on the primary transformer T1, and the concave portion 2a is formed on the secondary transformer T2.
Although 1a is formed, it is not limited to this configuration. That is, since the magnetic flux leaking from the power unit via the air gap G is shielded, a concave portion is formed in the primary transformer T1,
A convex portion may be formed on the substrate.

Next, a second embodiment of the present invention will be described with reference to FIG. The difference between the present embodiment and the first embodiment is that the configuration of the convex portion and the concave portion formed at the center of the frame is changed. Therefore, for each member other than the convex portion and the concave portion, the reference numerals given in the first embodiment are referred to. In the present embodiment, as shown in FIG. 2, the gap G of the power unit and the gap g of the signal unit do not form a horizontally continuous plane. That is, the primary signal transmission coil 12 is buried deep in the frame 2 and the outside of the gap g is formed in the partition 2b. Although the secondary signal transmission coil 32 protrudes downward from the frame 21 constituting the secondary transformer T2, the secondary partition 2b
It is in the form fitted inside.

In this configuration, the periphery of the signal section is surrounded by the partition 2b. As described above, when power is supplied to the primary-side power transmission coil 6 and an electric signal is supplied to the primary-side signal transmission coil 12, a magnetic flux is generated from the coil 6 and the coil 12. This magnetic flux induces a voltage in the secondary-side power transmission coil 26 and induces a signal voltage in the secondary-side signal transmission coil 32, so that power and electric signals are transmitted without contact.

Here, with respect to the magnetic flux generated from the primary side power transmission coil 6, a part of the magnetic flux leaks toward the center (ie, toward the signal portion) through the gap G. However, since the signal portion is surrounded by the convex portion 2b, the magnetic flux leaking in the signal portion direction is blocked by the convex portion 2b and does not reach the gap g of the signal portion. That is, the signal part is magnetically shielded against the leakage magnetic flux of the power part in the same manner as described above, and the leakage magnetic flux does not overlap with the magnetic flux generated from the primary side signal transmission coil 12,
As described above, the S / N ratio is improved. As a result, coil 1
The magnetic flux generated from 2 is not affected by noise.
The signal is received by the secondary signal transmission coil 32, and accurate signal transmission is performed.

Although the partition 2b is formed on the primary transformer T1 in the above configuration, the present invention is not limited to this configuration. That is, since the magnetic flux leaking from the power unit via the air gap G is shielded, contrary to the above configuration,
A difference may be formed in the secondary outer transformer T2.

[0022]

As described above, in the rotary power / signal non-contact transmission device according to the present invention, the gap between the opposing surface of the power transmission core and the gap of the opposing surface of the signal transmission core are different. Since they are arranged on parallel surfaces that are offset from each other in the axial direction, the leakage magnetic flux generated due to the power transmission is shielded by the difference and does not leak between the signal coils. Do not superimpose as noise. Therefore, it is possible to prevent the signal transmission efficiency from deteriorating and to increase the power transmission amount.

Further, the gap surface formed between the power transmission core and the signal transmission core and the opposing surface of the non-magnetic frame is parallel to the gap of the opposing surface of the power transmission core. As described above, it is possible to block leakage magnetic flux and attenuate superimposed noise as described above. The magnetic shield between the primary side signal coil and the secondary side signal coil is performed by a step structure formed on the frame without using a special shield member. In addition, low-cost production can be achieved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a first embodiment of a rotary contactless power and electric signal transmission device to which the present invention is applied.

FIG. 2 is a cross-sectional view showing a second embodiment of a rotary contactless power and electric signal transmission device to which the present invention is applied.

FIG. 3 is a cross-sectional view illustrating an example of a conventional rotary contactless power and electric signal transmission device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rotation type non-contact electric power and electric signal transmission device 2, 21 Frame 2a Convex part 2b Difference 3, 23 Groove part 4 Primary power core 6 Primary power coil 8 Primary signal core 12 Primary Side signal coil 21a Concave portion 24 Secondary side power core 26 Secondary side power coil 28 Secondary side signal core 32 Secondary side signal coil T1 Primary side transformer T2 Secondary side transformer G, g Air gap H difference

Claims (2)

[Claims] 1. A power transmission core in which a power transmission coil is housed in a ring-shaped groove and a signal transmission core in which a signal transmission coil is housed in another ring-shaped groove are concentrically nonmagnetic. Flat cylindrical transformer 1 placed in body frame
In a rotary power / signal non-contact transmission device in which a pair is arranged to face each other via a gap, the gap on the facing face of the power transmission core is more axially than the gap on the facing face of the signal transmission core. A non-contact rotary power / signal transmission device characterized by being arranged on shifted parallel surfaces. 2. A power transmission core in which a power transmission coil is accommodated in a ring-shaped groove and a signal transmission core in which a signal transmission coil is accommodated in another ring-shaped groove are concentrically non-magnetic. Flat cylindrical transformer 1 placed in body frame
In a rotary power / signal non-contact transmission device in which a pair is opposed to each other with an air gap therebetween, a gap formed between the power transmission core and the signal transmission core and the opposing surface of a nonmagnetic frame. Are arranged on a parallel surface that is displaced in the axial direction from the gap between the opposing surfaces of the power transmission core, and is a contactless transmission device for rotary power and signals.