JPH02159704A - Rotary joint transformer - Google Patents

Abstract

PURPOSE:To simplify constitution, to improve durability and to contrive to shut off the noise generated independently on each system by a method wherein a first coil, a second coil and a supporting means, with which the first coil and the second coil will be supported in a freely rotable manner with each other relatively, are provided. CONSTITUTION:A rotary joint transformer 8 consists of a pair of coil plates 81 and 82 which are supported in parallel with each other above a slip-ring assembly 9. The coils 81 and 82 are attached above the slip-ring assembly 9 in such a manner that their surfaces are opposing with each other in parallel, and circular coils 812 and 822 are attached above a slip-ring assembly 9 in such a manner that they are freely rotatable relatively with each other on the same axle. To be more precise, the former is attached to the stay 83 fixed to a cover 98, and the latter is attached to the stay 84 fixed to a pipe 91. An axis-mating operation can be performed easily when positioning works 813 and 823 are viewed from axial direction. As a result, a sliding part can be eliminated, durability is improved, and as electric contact points are eliminated, the propagation of common noise can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a device for transmitting alternating current electrical signals between two systems that rotate relatively around a predetermined rotation axis.

(Prior Art) For example, in a rotating antenna device, if the rotation of the antenna is not restricted, special measures are required for transmitting and receiving signals between the rotating side and the fixed side. Conventionally, devices called slip rings and rotary joints have been used to send and receive such signals. The former consists of a conductor brush that slides on a conductor ring concentrically with the rotating shaft, and is mainly suitable for transmitting direct current or low frequency signals. The latter has the same principle structure as a coaxial connector, consists of an outer conductor and an inner conductor that are in rotating and sliding contact with each other, and is mainly used for transmitting high-frequency signals.

[Problem to be solved by the invention]

However, since conventionally used slip rings and rotary joints both have sliding parts, processing accuracy and wear of the sliding parts pose problems.

Furthermore, since these are electrically connected, there is a problem in that noise generated individually in each prefecture is transmitted when transmitting AC signals.

The purpose of the invention was to simplify the configuration and improve the durability of a device that transmits alternating current signals between systems that are independent in terms of rotation, as well as to block noise generated individually in each prefecture. .

[Means to solve the problem]

In order to achieve the above object, in the present invention, a circular first coil and a second coil; and the first coil and the second coil are rotatable relative to each other around a rotation axis passing through their respective centers. A rotary coupling transformer is provided, comprising: supporting means for supporting the rotary coupling transformer.

[Effect]

According to this, since the first coil and the second coil are magnetically coupled, there are no sliding parts and durability is improved, and since there are no electrical contacts, each system is independent in terms of rotation. This prevents the transmission of common noise. Furthermore, since magnetic coupling is created around the entire circumference of each coil, and distortions due to coil spacing and coil shape are averaged over the entire circumference, there is a certain degree of freedom in coil spacing and each coil shape, allowing for flexibility in design and configuration. becomes easier.

The support modes for each coil include coaxial and parallel support,
Alternatively, concentric and in-plane support may be considered, but in the latter case, each coil must have a different diameter.

Other objects and features of the present invention will become apparent from the following description of embodiments with reference to the drawings.

〔Example〕

A preferred embodiment of the present invention can be seen in the antenna device for receiving satellite broadcasting mounted on a mobile object such as an automobile as shown in FIGS. 2a and 2b. In this type of antenna device, since the relative positional relationship with the opposing station (broadcasting satellite) is uncertain, mechanical and electrical measures are taken so that the pointing direction of the antenna can be changed freely.

First, the mechanical configuration will be explained with reference to FIGS. 2a and 2b.

This antenna device detects the arrival direction of radio waves (the direction in which broadcasting satellites are present) and uses four planar antennas 11°, 12°, 13°, and 1° with the same characteristics to receive satellite broadcasting.
4 and they are.

A rectangular antenna unit 1 is supported by an antenna bracket 15 in the same plane (the main beam of each flat plate antenna forms the edge of a rectangular cylinder).

The antenna bracket 15 is rotatably supported on the rotary table 16 by a shaft 151, and is rotated forward and backward around the shaft 151 by an elevation motor Me. In other words, when the elevation motor Me is energized to rotate normally, the antenna unit 1
The orientation direction in the elevation rotation plane (in the plane perpendicular to the base 17 fixed to the roof of a car, etc.) is the CW force direction (the direction defined in the state shown in Figure 2b: that is, the direction in which the elevation angle increases) When it is updated and reversely energized, it becomes CC
W direction (direction also defined in the state shown in Figure 2b:
(in the direction in which the elevation angle decreases).

This update speed is continuously variable in the range of 0 to 1100 de/g, but the rotation range is 60' (base 17
is limited to a range of 5°γ65°).

The rotating table 16 is rotatably coupled to a hollow base block 171 fixed to the base 17 via a plurality of sets of angular bearings. This base block 171
A sun gear 172 is integrally molded on the rotary base 16, and a planetary gear (not shown) pivotally connected to the rotary table 16 meshes with the sun gear 172. This planetary gear is an azimuth motor M
It is forward and reversed by a. In other words, when the azimuth motor Ma is energized for forward rotation, the orientation direction in the azimuth rotation plane of the antenna unit 1 (in the plane parallel to the base 17) is the CW force direction defined in the state shown in FIG. 2a: In other words, when the vehicle equipped with the device of this embodiment is installed in the CCW direction (direction defined in the state shown in FIG. (the direction in which the vehicle turning left) is updated. This update speed is continuously variable in the range of 0 to 1100 de/s, and there is no limit to the rotation range.

As described above, the orientation direction of the antenna unit l is determined by the azimuth motor Ma and/or the elevation motor M.
can be selected arbitrarily by forward/reverse biasing of e (however, the elevation rotation is at an elevation angle of 5'' to 65° with respect to the base 17).
).

Next, the electrical configuration for energizing the azimuth motor Ma and the elevation motor Me in the forward and reverse directions will be described. Please also refer to Figure 3.

As shown in FIG. 3, the signal received by the planar antenna 11 is sent to the BS converter 21, the signal received by the planar antenna 12 is sent to the BS converter 22, the signal received by the planar antenna 13 is sent to the BS converter 23, and the signal received by the planar antenna 13 is sent to the BS converter 23. 1
The signals received by the terminals 4 and 4 are respectively given to the BS converter 24. Each of these BS converters 21, 22, 23
and 24, using the common first local oscillator signal output by the second local oscillator LO, approximately 1
A high frequency signal of 2 GHz is converted into a first intermediate frequency signal of approximately 1.3 GHz.

Further, the first intermediate frequency signal outputted by the BS converter 21 is sent to the tuner 31, and the first intermediate frequency signal outputted by the BS converter 22 is sent to the tuner 31.
The intermediate frequency signal is sent to the tuner 32.

The first intermediate frequency signal output from the BS converter 23 is applied to the tuner 33, and the first intermediate frequency signal output from the BS converter 24 is applied to the tuner 34, respectively. In each of these tuners 31, 32, 33 and 34, a voltage controlled oscillator VCO (second local oscillator) is activated according to the control voltage set by the channel selector 64 of the television set 6.
BS converters 21, 22, 23 or 24 corresponding to each other using a common second local oscillator signal output by
The first intermediate frequency signal of approximately 1.3 GHz given by the above is converted into a second intermediate frequency signal of approximately 403 MHz.

These second intermediate frequency signals are combined into one in the signal processing circuit 4 and provided to the receiving unit 61 of the television set 6. Receiving unit 61 demodulates this second intermediate frequency signal and outputs video and audio via CRT display 62 and speakers 63r and 63Q.

By the way, as mentioned above, in the antenna device of this embodiment, each BS converter 21, 22.

Since a common first local oscillator signal is used in 23 and 24, and a common second intermediate frequency signal is used in each tuner 31, 32, 33 and 34, a phase shift occurs between the signals received by each planar antenna. , a similar phase shift appears between each second intermediate frequency signal. This phase shift is caused by the arrangement of each planar antenna in the antenna unit 1 and the shift in the pointing direction of the antenna unit 1 with respect to the direction of arrival of radio waves.
Conversely, from this phase shift, it is possible to know the shift in the pointing direction of the antenna unit 1 with respect to the arrival direction of the radio waves.

In addition to the function of synthesizing the second intermediate frequency signals described above, the signal processing circuit 4 detects the phase shift that occurs between the second intermediate frequency signals and adjusts the antenna unit l within the azimuth rotation plane.
A function for generating an azimuth error signal indicating the deviation between the pointing direction of the antenna unit 1 and the arrival direction of the radio wave, and an elevation error signal indicating the deviation between the pointing direction of the antenna unit 1 and the arrival direction of the radio wave within the elevation rotation plane. The generated azimuth error signal and elevation error signal are supplied to the control circuit 5. □゛The control circuit 5 is
While monitoring the limit switches Lu and LQ that detect the limits of the elevation rotation range, an energization instruction for the azimuth motor Ma is sent to the azimuth motor driver DRva based on the azimuth error signal given from the signal processing circuit 4 to detect the elevation error. Elevation motor driver D sends an instruction to energize the elevation motor Me based on the signal.
R V e respectively, and attitude control is performed so that the pointing direction of the antenna unit 1 coincides with the arrival direction of the radio waves. However, if the antenna unit 1 is blocked and reception becomes impossible, the azimuth gyro Ga and the elevation gyro Ge detect the azimuth rotation and elevation rotation due to external force of the antenna unit 1, and the antenna immediately before that rotation is detected. Maintain unit 1's attitude (radio wave reach -10 = attitude toward the east).

Of the electrical components mentioned above, the BS converter 2
1,22. [3 and 24 are the corresponding planes on the back surface of the antenna bracket 15, as shown in FIG. It is installed near the feeding point of the antenna. For convenience of circuit configuration, tuners 31, 32, 33, and 34. Signal processing circuit 4. First local oscillator LO and voltage controlled oscillator v
The CO is provided on the back side of the antenna bracket 15.

In addition, the azimuth gyro G, a is installed on the rotary base 1 because it is necessary to detect the azimuth rotation of the antenna unit 1 due to an external force.
The elevation gyro Ge is provided on the back surface of the antenna bracket 15 because it is necessary to detect the elevation rotation of the antenna unit 1 due to an external force.

In this way, the antenna unit 1. Motors Ma and M
Most of the electrical components mentioned above, including e, BS converter 2 (total sign), tuner 3 (total sign), signal processing circuit 4, first local oscillator LO and voltage controlled oscillator The vCO is mounted above the rotating table 16 (this concept should be understood to include being provided on the antenna bracket 15), and rotates together with the rotating table 16.

Since this rotation is not limited, it is convenient for wiring etc. to provide the control circuit 5 and motor drivers D RV a and D RV e in the same rotation system. For this reason, as shown in FIG. 2a, the control circuit 5 and the motor drivers D RV a and D R, Ve are installed on the rotary table 16 .

Further, a constant voltage power source 72 is also installed on the rotary table 16 for convenience of power supply to each component.

Note that AC 100v is supplied to this constant voltage power supply 72 from a booster circuit 71 that boosts the voltage of the battery Btt.

With the above configuration, the system for controlling the attitude of the antenna unit 1 is closed on the rotary table 16 (the system on the left side in FIG.
However, as for the system that processes the received signal of the antenna unit 1, the final output, the television set 6, must be installed inside a car, etc. It cannot be closed. Furthermore, regarding the power supply system 7, it is necessary to place the battery Btt and the booster circuit 71 outside the rotary table 16 due to physical rationality. For these systems that go out of the turntable 16, it is necessary to provide rotatable connection means.

The antenna device of this embodiment is as follows:1. A rotary coupling transformer 8 is used as a means for transmitting the second intermediate frequency signal from the signal processing circuit 4 to the receiving unit 61 of the television set 6, and a set control voltage is transmitted from the channel selector 64 of the television set 6 to the voltage controlled oscillator VCo. means (2w) to supply ACljlOv from the booster circuit 71 to the constant voltage power supply 7
A slip ring assembly 9 is provided as a means (2W) for supplying the 2. These will be explained below, but for convenience of explanation, 1. Refer to Figures 4a and 4b and see if it's not a pickpocket? The pulling assembly 9 will be explained first.

Note that FIG. 4a is a sectional view taken along the line IVA-IVA in FIG. 4b, and FIG. 4b is a sectional view taken along the line IVB-IVB in FIG. 4a.

The slip ring assembly 9 is attached to the base block 17
It is attached to a hollow pipe 91 inserted and fixed into the hollow part of 1, and consists of a ring part fixed to the pipe 91 and a brush part pivoted to the pipe 91.

The ring portion includes two ring units 92 and 93 and a bottom plate 94. Ring units 92 and 93 are exactly the same, and the former is a ring holder 921. Metal rings 922, 923. and conductor screws 924, 92
5, the latter being a ring holder 931. metal ring 93
2,933. and conductor screws 934, 935. It becomes more. Hereinafter, for parts with common explanations, the reference numbers of the latter elements are shown in parentheses.

The ring holder 921 (931) is a cylindrical insulator with a convex portion formed in the middle of the circumferential surface, and the metal ring 922 (931)
32) and 923 (933) are mounted on both sides with the convex portion sandwiched therebetween. Conductor screw 924. (934) is the conductor screw 925 from directly below the metal ring 922 (932).
(935) is from directly below the metal ring 923 (933),
Each of them extends through the ring holder 921 (931) in the radial direction, and each head is soldered to a part of the metal ring 922 (932) or 923 (933) immediately above. However, these conductor screws 9
24 (934) and 925 (935) are separated by 120° in the axial projection.

In addition, the ring holder 921 (931) has three screw holes penetrating it in the axial direction at 120° intervals.
One of them is conductor screw 924 (934) and conductor screw 92
5 (935).

These ring units 92 and 93 are 120″′
They are assembled in a shifted manner and are screwed onto the bottom plate 94 by screws passing through each screw hole.

The bottom plate 94 has a hole that is concentric with the ring units 92 and 93 and is approximately equal to the outer diameter of the pipe 91.
1 and fixed.

The brush portion includes a brush base 95 and brush units 96 and 97. The brush base 95 is fixed on the rotary table 16 so that it cannot rotate, so it is pivotally connected to the pipe 91 via a radial bearing.
It is screwed symmetrically with respect to the center. Hereinafter, for parts with common explanations, the reference numbers of the latter elements are shown in parentheses.

The brush unit 96 (97) is attached to the bracket 961 (9
71), brush holder 962 (972
).

and four completely identical brushes 9.63 (973) to 9
It consists of 66 (976). Each brush 963 (973) ~ 9
66 (976) is an arc-shaped elastic metal piece with shoes at both ends, which are arranged on the brush holder 962 (972) at the same spacing as the spacing between the metal rings of the ring part, and each has two pieces in the center. It is fixed by a conductor screw passing through the brush holder 962 (9, 72). Further, the brush holder 962 (972) is attached by a bracket 961 (971) to a position where the two shoes of each brush are pressed against the corresponding metal ring with a predetermined pressure. In other words, the metal ring 922 has the four shoes of the brushes 963 and 973, the metal ring 923 has the four shoes of the brushes 964 and 974, and the metal ring 932 has the four shoes of the brushes 965 and 975. Four shoes provided on brushes 966 and 976 come into contact with metal ring 933, respectively. Therefore,
Short-circuit each of the four conductor screws that attach the pair of brushes to one metal ring and the two metal rings that are in contact with it.
The contact resistance between the two brushes is reduced.

The ring portion and brush portion described above are covered by a cover 98. This cover 98 is a cylinder with a bottom plate, and the pipe 91 and the bottom plate pass through the bottom plate so as to be rotatable, and the opening portion is fixed to the brush bailer 95. In addition, a ring-shaped terminal plate 99 is provided inside the bottom plate, and there are four terminals 991 to 99 passing through the bottom plate and terminals *9.9.
994 is equipped. These terminals 991-9
Reference numeral 94 indicates ACloov from the booster circuit 71 transmitted from the power supply line (signal line) passing through the pipe 961 through contact with each of the metal rings 922 to 933, or the set control voltage from the channel selector 64, or the voltage controlled oscillator vCO. Alternatively, it is distributed to the booster circuit 71.

On the other hand, the one-turn coupling transformer 8 consists of a pair of coil plates 81 and 82 supported in parallel above the slip ring assembly 9 (see Figures 2b to 2).

As is clear from FIGS. 1a and 1b, these coil plates 81 and 82 have exactly the same configuration, and include a rectangular substrate 8↓1 (821) and a one-turn circular coil 812.
(822), positioning mark 813 (823), 5
It consists of a 0Ω coaxial connector 814 (824) and an attenuator 815 (825).

The substrate 811 (821) is made of a translucent glass epoxy plate, and the circular coil 812 (822) is formed on its surface by etching copper foil. Also, the positioning mark 81.3 (823) is 1, circular square, circle 812 (82
2) and two orthogonal straight lines passing through its center.

The coaxial connector 814 (824) is connected to the board 811 (821).
), one end of a circular coil 812 (822) is connected to its inner conductor, and the other end of the circular coil 812 (822) is connected to its outer conductor. These connectors include a coaxial cable (not shown) connected to the signal processing circuit 4 or a coaxial cable 85 (4th a) connected to the receiving unit 61 through the pipe 91.
Figure) is connected.

The attenuator 815 (825) is a resistor for widening the band, and is inserted between both terminals of the circular coil 812 (822).

These coil plates 81 and 82 are arranged above the slip ring assembly 9 so that their surfaces are parallel and facing each other, and the circular coils 812 and 822 are coaxially rotatable relative to each other. mounted on. That is, the former is attached to a stay 83 fixed to a cover 98, and the latter is attached to a stay 84 fixed to a pipe 91. In this installation, the mounting part of each stay 83.84 is made a surface to facilitate parallel support of each coil plate 81.82, and positioning marks 813.823 printed on the inside of each circular coil 812.822 are aligned from the axial direction. The line-of-sight makes alignment easier.

The rotary coupling transformer 8 configured in this manner is schematically illustrated in FIG.
822) rotate relative to each other, microscopic non-uniformity of each coil and distortions such as spacing are averaged over the entire circumference of each coil, and periodic noise caused by this is reduced. Furthermore, since there is magnetic coupling between these coils, it will be understood that transmission of common noise is blocked.

In addition, each coil plate is extremely easy to create, and
Since they are the same, they can be made in the same process, which is very advantageous in terms of cost.

By the way, when this type of antenna device is installed in a car or the like, the outside of the car, for example, the roof, is selected as the mounting location. Therefore, the entire device is covered with a radome RDM for the purpose of dustproofing and waterproofing. In this case, since the front surface of the antenna will be covered with a dielectric material, it is desirable to suppress the transmission loss due to this radome RDM as small as possible.

In other words, the radome RDM should be made of as thin a material as possible, but due to the characteristics of this type of antenna device, it is impossible to avoid vibrations and wind pressure caused by the movement of the automobile to which it is attached, so the strength should not be neglected. I can't.

Radome RDM used in the antenna device of this example
The outer skin is made of FRP and is about 1III11 thick.

Approximately 4mm thick core made of styrofoam and FRP
It is composed of an inner epidermis approximately 1 mm thick. F.R.
Although the dielectric constant of P is relatively high, it is sufficiently thin, and the strength deteriorated by this is compensated for by sandwiching the core of expanded polystyrene, which has a relatively low dielectric constant. In other words, the radome has low transmission loss and high strength.

Note that a cooling fan is provided on the base 17 and is driven by a motor M (see FIG. 3) that receives power from the booster circuit 71 when the power switch 65 is turned on to prevent a temperature rise inside the radome RDM. There is.

This concludes the description of the embodiment, but as is clear from the above description, the rotary coupling transformer is used as a means of transmitting the second intermediate frequency signal from the signal processing circuit 4 to the receiving unit 61 of the television set 6. 8 is not a resonant circuit. In other words, there is a degree of freedom in selecting the diameter of each circular coil 812 and 822.

Therefore, variations using circular coils 812'' and 822' of different diameters as shown in FIG. 1d, or ring-shaped coils 8 wound around concentric cylinders as shown in FIG. 1e are possible.
Variations using 12" and 822" are possible. Although these have the disadvantage that parts with each coil cannot be made in the same process, the same effect as above can be expected, so these modifications can be used when the above configuration is limited due to space. The configuration shown in the example will be utilized.

〔Effect of the invention〕

As explained above, the rotary coupling transformer of the present invention is
a circular first coil and a second coil; and the first
Since the coil is provided with a support means for supporting the coil and the second coil so as to be rotatable relative to each other around a rotation axis passing through the center of each, there is no space between the first coil and the second coil. Since there are no sliding parts, durability is improved, and since there are no electrical contacts, the transmission of common noise that each of the rotationally independent systems has is prevented.

Furthermore, magnetic coupling is created around the entire circumference of each coil, and distortions such as coil spacing and coil shape are averaged over the entire circumference.
There is a certain degree of freedom in coil spacing and each coil shape,
Easier design and configuration.

In addition, each coil may be supported coaxially and parallelly, or concentrically and within the same plane, as shown in the description of the embodiment.

[Brief explanation of the drawing]

1a and 1b are plan views showing the structure of a coil plate 81 or 82 constituting a rotary coupling transformer according to an embodiment of the present invention, and FIG. 1c is a schematic diagram thereof. FIG. 1d and FIG. 1e are schematic diagrams showing modified examples. FIG. 2a is a plan view showing the mechanical configuration of a satellite broadcast receiving antenna device in which the rotary coupling transformer of the embodiment is used, and FIG. 2b is a front view thereof. FIG. 3 is a block diagram showing the electrical configuration of the antenna device shown in FIGS. 2a and 2b. FIG. 4a is a vertical sectional view showing the structure of the slip ring assembly 9 used in the antenna device shown in FIGS. 2a and 2b, and FIG. 4b is a horizontal sectional view thereof. 1: Antenna units 11 to 14: Planar antenna 15: Antenna bracket 1c two-turn stand 17: Base 2: BS converter 3: Tuner 4: Signal processing circuit 5: Control circuit 6: Television set 61: Receiving unit 62: CRT display 63 Nisby Cuff: Power supply device 71: Boost circuit 72: Constant voltage power supply 8: Rotating coupling transformer 81.82: Coil plate 811.821': Substrate 812.822: Circular coil (first and second coil) 8
13.823: Positioning mark 814.824: Coaxial connector 815.825: Attenuator 83.84 Nisty (supporting means) 85: Coaxial cable 9 Nissuri spring assembly 91: Pipe 92.93: Ring unit 921.931: Ring Holder 922, 923, 932, 933: Metal ring 924
．． 925,934,935: Conductor screw 94: Bottom plate 95: Brush base 96.97: Brush unit 961.971 Bracket 962.972-: Brush holder 963-966.973-976: Brush 98: Cover 99: Terminal plate 991 ~994: Terminals Ma, Me: Motors DRVa, DRVe: Motor drivers Ga, Ge: Gyro ROM Nire dome

Claims (3)

[Claims] (1) a circular first coil; a circular second coil; and a support means that supports the first coil and the second coil so as to be rotatable relative to each other around a rotation axis passing through the center of each; A rotary coupling transformer comprising: (2) The supporting means supports the first coil and the second coil coaxially and in parallel.
The rotary coupling transformer described in item 1). (3) The first coil and the second coil have different diameters, and the supporting means supports the first coil and the second coil,
Claim No. 1 (1) is supported concentrically in the same plane.
) The rotary coupling transformer described in section 2.