DE102013002052A1 - Rotary transformer, has annular circuit board arranged radially outside of annular wall, printed circuit board arranged on one of set of axial parts and is axially spaced apart and arranged coaxially with annular conductor plate - Google Patents

Abstract

The transformer has a set of annular walls (3, 6, 8) with a set of axial parts that is arranged coaxial with regard to each other. Each axial part of the annular wall protrudes into another axial part. A ring winding (2) with number of turns that is larger than unity is arranged radially inside the annular wall. An annular circuit board is arranged radially outside of the annular wall. A printed circuit board is arranged on one of the set of axial parts and is axially spaced apart and arranged coaxially with an annular conductor plate.

Description

The invention relates to a rotary transformer.

It is well known that in a rotary transformer, a transformer power transmission between two windings is executable.

The invention is therefore based on the object to achieve a compact signal and power transmission.

According to the invention, the object is achieved in the rotary transformer according to the features specified in claim 1.

• – wobei radial innerhalb einer ersten Ringwand des ersten Teils eine Ringwicklung, insbesondere mit einer Windungszahl größer als Eins, angeordnet ist, die einer Ringwicklung des anderen Teils auf gleichem Radialabstand axial gegenübersteht, wobei radial außerhalb der ersten Ringwand des ersten Teils eine ringförmige Leiterplatte angeordnet ist, welche eine ringförmige Leiterbahn aufweist, die an einer Umfangsstelle unterbrochen ausgeführt ist, insbesondere wobei an die entsprechenden Endbereiche eine Signalspannung angelegt wird oder eine empfangene Signalspannung detektiert wird,
• – oder wobei radial außerhalb einer ersten Ringwand des ersten Teils eine Ringwicklung, insbesondere mit einer Windungszahl größer als Eins, angeordnet ist, die einer Ringwicklung des anderen Teils auf gleichem Radialabstand axial gegenübersteht, wobei radial innerhalb der ersten Ringwand des ersten Teils eine ringförmige Leiterplatte angeordnet ist, welche eine ringförmige Leiterbahn aufweist, die an einer Umfangsstelle unterbrochen ausgeführt ist, insbesondere wobei an die entsprechenden Endbereiche eine Signalspannung angelegt wird oder eine empfangene Signalspannung detektiert wird,

wobei eine zur ringförmigen Leiterplatte gleichartig ausgeführte Leiterplatte am anderen Teil angeordnet ist, insbesondere schraubverbunden ist, insbesondere axial beabstandet und koaxial zur ringförmigen Leiterplatte angeordnet ist.Important features of the invention in the rotary transformer,
wherein the rotary transformer has two parts, which are arranged coaxially with one another,
each part having ring walls which project to the other part,

• - Wherein radially within a first annular wall of the first part, a ring winding, in particular with a number of turns greater than one, is arranged axially facing a ring winding of the other part at the same radial distance, wherein radially outside the first annular wall of the first part, an annular circuit board is arranged comprising an annular track formed to be interrupted at a circumferential location, in particular to which a signal voltage is applied to the respective end areas or a received signal voltage is detected,
• - Or wherein radially outside a first annular wall of the first part of a ring winding, in particular with a number of turns greater than one, is arranged, which axially opposite a ring winding of the other part at the same radial distance, wherein radially disposed within the first annular wall of the first part, an annular circuit board is, which has an annular track which is executed interrupted at a circumferential location, in particular wherein a signal voltage is applied to the corresponding end areas or a received signal voltage is detected,

wherein a circuit board designed identically to the annular circuit board is arranged on the other part, in particular screw-connected, in particular axially spaced and is arranged coaxially to the annular circuit board.

The advantage here is that a power transmission and a signal transmission in different radial areas undisturbed executed to each other.

In an advantageous embodiment, the first annular wall of the part projects at least partially into a groove formed radially between two annular walls of the other part. The advantage here is that a very good shielding by a spring-groove-like principle can be achieved.

In an advantageous embodiment, the first and / or the other part is or are made of metal, in particular aluminum. The advantage here is that a simple production and a low moment of inertia can be achieved because of the low specific weight.

In an advantageous embodiment, the respective printed circuit board is screw-connected to the respective part. The advantage here is that a simple connection is feasible.

In an advantageous embodiment, the respective printed circuit board on its side facing the other part on a functioning as an antenna conductor, which is embedded by surrounding ground surfaces. In this case, the circuit board is multi-layered and arranged in the same position in which the functioning as an antenna conductor, radially inwardly and radially outwardly each arranged a further interconnect, which is connected to ground. In a lower lying position, ie also from the other part of the rotary transformer further arranged layer, a further used as a ground surface trace is arranged, which covers the area radially overlapped by the acting as an antenna conductor track area. The advantage here is that a near field transmission with high efficiency for high frequencies can be achieved.

In an advantageous embodiment, an annular wall of the other part projects at least partially into a groove formed radially between two annular walls of the first part. The advantage here is that a tongue and groove-like shield is executable.

In an advantageous embodiment, each of the parts has a connector part for supplying the ring winding or the annular conductor track. The advantage here is that a fast and easy electrical connection can be used.

In an advantageous embodiment, the part has a centrally arranged shaft receptacle, in particular comprising a shaft-hub connection. The advantage here is that a simple connection is executable.

In an advantageous embodiment, each of the parts is half-shell-shaped. The advantage here is that a good shielding is achievable.

Further advantages emerge from the subclaims. The invention is not limited to the combination of features of the claims. For the skilled person, further meaningful combination possibilities of claims and / or individual claim features and / or features of the description and / or figures, in particular from the task and / or posing by comparison with the prior art task arise.

The invention will now be explained in more detail with reference to figures:

In the 1 is an oblique view of a first part 60 a Drehübertragers invention shown.

The rotary transformer has two mutually coaxially arranged, relative to each other rotatably arranged parts ( 60 . 61 ) on. 1 shows the first part 60 ,

The second part 61 is structured accordingly.

As in 1 is shown, the first part of the rotary transformer according to the invention by means of a shaft receiving 1 connectable with a shaft, for which purpose a shaft-hub connection is provided.

2 shows a cutting direction through the circuit board ( 20 ), with the associated section in 3 is shown.

4 shows a cutting direction through the circuit board ( 20 ), with the associated section in 5 is shown.

6 shows the truncated rotary transformer in an oblique view.

As in 1 shown points the first part 60 axially to the other, in 6 shown part 61 facing the rotary transformer protruding ring walls ( 3 . 8th . 6 ) on.

Radially inside a ring wall 3 is the area for the power transmission arranged. Here is a ring winding 2 placed in a recessed area provided in ferrite material. In this way, the magnetic field behind the ring winding 2 guided around. The ferrite material 65 is in 1 Not shown. Overall, however, is the ferrite material 65 essentially designed as a ring, which in turn has an annular recess in which the ring winding 2 is included.

Radially outside the ring wall 3 the signal transmission, in particular information transmission is provided.

For this purpose, the part is a printed circuit board 20 with screws 9 screw-connected and in a radially between the ring walls ( 3 . 6 ) arranged annular groove arranged.

By means of the screws 9 , which are screwed into corresponding screw holes of the first part, wherein the screw heads the circuit board 20 press against the first part, a ground connection is also achieved, because the circuit board 20 has in the contact area with the screw heads uninsulated metallic conductor track sections on its surface, which are electrically connected to ground. It also stabilize the screws 9 the circuit board 20 mechanically, so that a stable connection is achieved with the first part. The arrangement of the screws in the circumferential direction and radial direction is chosen such that the imbalance is minimal.

In this way, so signal transmission area and power transmission area through the ring wall 3 radially separated.

The part and thus also the ring walls ( 3 . 6 . 8th ) are preferably made of a metal such as aluminum.

The conductor track 4 including them in the same situation and in the others, especially the other part 61 the rotating transformer further spaced layers surrounding ground surfaces, ie with electrically grounded interconnects, is adjusted with respect to the impedance, the impedance is in particular 50 ohms. The conductor track 4 is located on the top of the circuit board 20 , wherein an electrically non-conductive lacquer layer protects against corrosion or mechanical influences.

At the end of the almost circular track 4 is a terminator 11 with a to the impedance of the conductor track 4 adjusted value, in particular 50 ohms, arranged so that reflections at the end of the conductor track 4 are avoidable.

On the other part 61 the rotary transformer remote axial side of the circuit board 20 is the on the other layer, in particular surface, arranged conductor track 4 covering, connected to ground interconnect arranged.

On the front, so the other part of the rotary transformer facing side an annular track 4 arranged, which is separated at a circumferential location, wherein the mass surfaces are mounted radially inwardly and outwardly in the same position.

Between the radially outer ring walls 6 and 8th is an annular groove 7 in part 60 intended.

By means of a connector part 10 becomes the ring winding 2 a stronger current supplied as the conductor 4 ,

The ring winding in this case a medium-frequency alternating current is supplied, which has a frequency between 10 and 1000 kHz. The conductor track is supplied to transmit information a frequency of about 1 MHz, in particular a frequency between 1 GHz and 10 GHz. As the diameter of the conductor track 4 between 10 cm and 50 cm, a high bandwidth is achievable and no interference from the power transmission.

The other part 61 the rotary transformer has an annular wall on the in the annular groove 7 Partially penetrates in the axial direction.

In addition, this has another, also made of metal, such as aluminum part 61 an annular groove into which the annular wall 3 at least partially penetrates in the axial direction.

In this way, an electromagnetic shield to the environment and between the two areas can be reached.

The other part 61 has a similar circuit board 20 with similar track 4 on, so that a good near-field coupling can be achieved.

In the first part 60 and in the other part 61 the Drehübertragers are not shielded by the ground surfaces sides of the respective conductor track ( 4 . 62 ) facing each other. This achieves good coupling of the high-frequency signals in the near field.

For power transmission is in the other part 61 also a ring winding 2 arranged by annular ferrite material 65 is surrounded, so that the generated magnetic field radially within the two ring windings 2 is passable and behind the respective ring winding 2 around and on the outside of the two ring windings 2 along.

The two parts ( 60 . 61 ) of the rotary transformer are thus carried out identically with the exception of the tongue and groove-like shielding area, comprising annular walls ( 3 . 6 . 8th ) and ring groove 7 ,

Like from the 2 . 3 . 4 and 5 can be seen, is a terminator 11 , in particular SMD resistor, between the first end of the conductor in the circumferential direction 4 and one in the same position of the circuit board 20 arranged conductor track 90 , which is electrically connected to earth, mounted.

The circuit board 20 is covered on its outer surface with paint layers against corrosion.

The via 92 respectively 94 serves in each case for connecting the conductor tracks 90 and 95 , which are connected to ground, and causes the signal-carrying trace 4 shielded on both sides and down with ground planes and thus the circuit board 20 similar to the principle of an open coaxial conductor is operable.

The circuit board 20 has a carrier material 93 on, in particular FR4, which carries the two layers and spaced from each other.

The circuit board 20 also has a through hole 96 for receiving a screw 9 on.

As in 6 shown are the two parts ( 60 . 61 ) of the rotary transformer are arranged axially opposite and rotatable relative to each other. By an axially directed circumferential circumferential elevation on the other part 61 which is in the groove 7 protrudes into the between the ring walls 6 and 8th existing as running in the circumferential direction annular groove executed groove 7 of the first part, a highly effective shielding from the point of view of radiation is thus achieved, even if between the first and the other part ( 60 and 61 ) There is an air gap. The axial width of the air gap is less than one tenth of the wavelength and the length in the circumferential direction is longer than one wavelength. The shield created by the tongue-and-groove principle is effective in that the length of the chimney, that is to say the length at which the radiation must wind out in the radial and in part also in the axial direction, is more than three times the axial width of the air gap.

The two between the parts 60 and 61 trained annular cavities are shielded from each other, in particular by means of the ferrites 65 ,

Thus, the signal transmission is disconnected from the power transmission.

For power transmission is also in the other part 61 a winding carrier 64 taken up with ring winding for power transmission, thus axially directly, so at the same radial distance from the winding support 2 with ring winding for power transmission of the first part 60 is arranged opposite. Axially, only one air gap is interposed between the two winding carriers ( 2 . 64 ).

At a larger radial distance of the other annular cavity is formed. Here again is a circuit board 63 screwed to the other part 61 and carries a substantially annular track 62 , This is interrupted only at one circumferential point and is thus usable as an antenna. It is directly the track 4 opposite, in particular at the same radial distance.

Axially interposed is only the air gap and the respective paint layer 91 ,

The circuit board 63 has the same structure as the printed circuit board 20 , So also the corresponding ground planes, which the conductor track 64 to the other part 61 in a different position than the track 64 shield. Within the same position as the track 64 are in turn arranged radially inside and outside ground surfaces.

Thus, a fail-safe and thus low-error signal transmission between the two near fields, ie interconnects ( 4 . 64 ).

In a further embodiment of the invention, the signal transmission area is within the annular groove 3 arranged and the power transfer area outside. Thus, a lower current and fewer losses in the then radially enlarged ring winding 2 reachable. However, then the moment of inertia of the rotary transformer is greater.

LIST OF REFERENCE NUMBERS

1

shaft mount

2

Winding carrier with ring winding for power transmission

3

ring wall

4

Trace on circuit board 20

5

Pickup area for ferrite

6

ring wall

7

groove

8th

ring wall

9

screw

10

connector part

11

Terminating resistor, in particular SMD resistor

20

circuit board

60

first part of the rotary transformer

61

second part of the rotary transformer, relative to the first part 60 rotatably arranged

62

Trace as antenna

63

circuit board

64

Winding carrier with ring winding for power transmission

65

ferrite

90

Conductor, in particular electrically connected to ground

91

paint layer

92

Through connection for connecting the printed conductors, which are connected to ground

93

Carrier material, in particular FR4

94

Through connection for connecting the printed conductors, which are connected to ground

95

Conductor, in particular electrically connected to ground

96

Borehole for receiving a screw 9

Claims (9)

Rotary transformer, wherein the rotary transformer has two parts which are arranged coaxially to each other, characterized in that each part has annular walls, which project to the other part, - wherein radially within a first annular wall of the first part of a ring winding, in particular with a number of turns greater than One, which is axially opposite a ring winding of the other part at the same radial distance, wherein radially outside the first annular wall of the first part, an annular circuit board is arranged, which has an annular conductor formed at a peripheral point interrupted, in particular wherein the a signal voltage is applied or detected signal voltage is detected corresponding end regions, - or wherein radially outside a first annular wall of the first part of a ring winding, in particular with a number of turns greater than one, is arranged, the one ring winding of and axially opposite to the same radial distance, wherein radially within the first annular wall of the first part, an annular circuit board is arranged, which has an annular conductor formed at a peripheral point interrupted, in particular wherein a signal voltage is applied to the corresponding end portions or a received Signal voltage is detected, with an annular circuit board ( 20 ) similar executed circuit board ( 64 ) on the other part ( 61 ), in particular screw-connected, is, in particular axially spaced and coaxial with the annular printed circuit board ( 20 ) is arranged. Rotary transmission according to at least one of the preceding claims, characterized in that the first annular wall of the part at least partially protrudes into a groove formed radially between two annular walls of the other part. Rotary transmission according to at least one of the preceding claims, characterized in that. The first and / or the other part made of metal, in particular aluminum, is or are. Rotary transformer according to at least one of the preceding claims, characterized in that the respective printed circuit board is screw-connected to the respective part. Rotary transformer according to at least one of the preceding claims, characterized in that the respective printed circuit board on its side facing away from the other part side has a respective further conductor track which is connected to ground and / or covers the annular conductor track in the radial direction. Rotary transmission according to at least one of the preceding claims, characterized in that an annular wall of the other part projects at least partially into a groove formed radially between two annular walls of the first part. Rotary transformer according to at least one of the preceding claims, characterized in that each of the parts has a connector part for supplying the ring winding or the annular conductor track. Rotary transmission according to at least one of the preceding claims, characterized in that the part has a centrally arranged shaft receptacle, in particular comprising a shaft-hub connection. Rotary transmission according to at least one of the preceding claims, characterized in that each of the parts is formed in a half-shell shape.

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