EP2113930B1 - Stator antenna ring - Google Patents

Description

The invention relates to a stator antenna ring for an inductive telemetry system for measuring energy and measured value transmission.

On rotating machines, it is often necessary to monitor rotating parts of the device with suitable receivers during operation or to record load-relevant measured values. In particular torques of rotating shafts are measured, in which the torque receivers rotate synchronously with the shaft and detect the torque transmitted through the shaft. For this purpose, usually fitted with strain gauges torque transducers are used, which must be supplied by stationary equipment parts with measuring energy and in which the measurement signals obtained are transmitted from the rotating torque transducer back to the stationary equipment parts. For non-contact transmission of such measured values and measuring energy inductive telemetry systems can be used, which have a rotating and a stationary antenna part. In this case, at least one induction coil is provided in each oppositely disposed antenna part, wherein the induction coils are inductively coupled together via a narrow air gap and so transmit the electrical signals without contact.

Such a telemetry system is from the DE 10 2005 040 794 A1 known, in which the measured values are transmitted by a rotor of a gas turbine to a stationary part of the device and the necessary energy in the opposite direction without contact. For this purpose, a support ring is arranged on the stationary device part, in which a stator coil with 10 turns of wire is fixed in isolation. The wire windings are mounted in a U-shaped groove and are outside of the carrier ring with a Alternator and a DC voltage source connected. The carrier ring is designed as a circulating iron core, so that the wire turns of the induction coil disposed therein must be arranged in isolation. Axially opposite to the stator, the rotor is arranged in front of the carrier ring. At the radially outer edge of the rotor, a projecting annular web is flange-mounted, which dips coaxially into the inner region of the stator antenna ring and forms a rotor antenna ring. On the inner circumferential surface of the rotor antenna ring, an induction coil is arranged as a rotor coil, which faces the stator coil while leaving a thin air gap. The rotor coil is connected to the measuring electronics mounted on the rotor, so that the measuring signals and the measuring energy can be transmitted without contact during rotor operation. Since in this inductive telemetry system, the stator antenna ring axially laterally adjacent to the stationary device part and the rotor antenna ring is obviously attached to the end of the rotor shaft, this telemetry system is not suitable for axially performed measuring wave systems.

In the DE 10 2004 028 595 A1 a device for non-contact transmission of energy and data between a fixed component and a relatively rotatable to this movable component is described, wherein on each of the two components, a coil carrying a carrier is arranged and at least one of the two carriers is divisible. The coil wires of the windings are not connected to each other at the separation points of the carrier, but each guided only over a carrier segment.

In the US 4,939,400 A a device is described for contactless transfer of energy and information between a fixed component and a relatively rotationally movable component, in which at each of the two Components a winding carrying carrier is arranged and both carriers are divisible. The coil wires of the windings are not connected to each other here at the separation points of the respective carrier, but each guided only over a carrier segment.

The invention has for its object to provide a Statorantennenring for an inductive telemetry system that can be used for torque measurement of feasible rotating measuring shafts and that can be easily installed without much installation effort in the measuring shaft system or is easily replaceable.

This object is achieved by the invention defined in claim 1. Further developments and advantageous embodiments of the invention are specified in the dependent claims.

The invention has the advantage that the radially divisible Statorantennenring can be retrofitted or replaced in a simple manner even with mounted measuring shafts without the measuring shaft would have to be dismantled for it. The embodiment with a receiving ring made of plastic material has the advantage that the induction coil relative to the stator does not have to be additionally insulated and is also very easy to produce.

The invention with a single radially split wire turn has the additional advantage that it is very robust and reliable, in particular by the hidden entry into the plastic retainer ring. In particular, the embodiment with the dovetail groove on the inner circumferential surface of the carrier ring has the advantage that the attachment of the induction coil to the stator antenna ring without adhesive processes is thereby easy to produce.

The particular embodiment of the Statorantennenrings of a polyamide plastic has the further advantage that thereby a very dimensionally stable and dimensionally accurate Statorantennenring can be produced. This additionally has the advantage that such a stator antenna ring does not have to be additionally insulated from the usually metallic stationary housing parts.

Another particular embodiment of the invention, in which the plastic support ring is mounted directly on a flat terminal housing, has the advantage that thus the Statorantennenring is screwed directly onto a stationary device part and thus at the same time the electronic connection and evaluation electronics is housed mechanically protected.

Fig. 1:

einen auf einem Anschlussgehäuse montierten Statorantennenring; und

Fig. 2:

eine Seitenansicht eines demontierten Statorantennenrings.

The invention will be explained in more detail with reference to an embodiment which is illustrated in the drawing. Show it:

Fig. 1:

a stator antenna ring mounted on a terminal housing; and

Fig. 2:

a side view of a disassembled Statorantennenrings.

The Fig. 1 The drawing shows a mounted on a terminal housing 2 Statorantennenring 1 for a telemetry system of a rotating torque-measuring device having a radially two-piece removable support ring 5 made of plastic, on the inner circumferential surface 8, a groove 9 is incorporated, in which a wire turn 10 of an induction coil. 3 is attached, which is also divided disassembled, wherein the stator antenna ring 1 with his flattened foot 4 is mounted on the terminal housing 2.

The plastic carrier ring 5 of the stator antenna ring 1 is circular and has an inner diameter of preferably about 200 mm and an outer diameter of about 240 mm. But there are also sizes with an inner diameter of 100 to 300 mm executable. The ring cross-section 14 is preferably rectangular or square, but may also have a rounded or a round shape. The plastic carrier ring 5 is preferably made of polyamide PA 6, which acts simultaneously electrically insulating. In this plastic ring 5, a narrow groove 9 is recessed or milled approximately in the axial center of the inner circumferential surface 8, in which a single wire turn 10 of an induction coil 3 is fixed. The groove 9 is preferably milled as a dovetail groove, in which the wire turn 10 can be pressed in a form-fitting manner by a clip-in process, wherein it is flush with the inner circumferential surface 8.

The design of the individual components of the stator antenna ring 1 without the connection housing 2 is in Fig. 2 the drawing shown in more detail. So shows Fig. 2 the drawing shows a radially two-part plastic carrier ring 5 as a carrier of the insulated introduced wire winding 10, which also according to the plastic ring parts consists of two radial sections 11, 12. As a result, the stator antenna ring 1 can be retrofitted even with a continuous rotatable measuring shaft, without the shaft section concerned having to be dismantled. Therefore, the plastic carrier ring 5 consists of a horizontal upper portion 6 and a horizontal lower portion 7 with a flattened foot 4. The two horizontal sections 6, 7 have an angular range of 180 °, wherein the plastic support ring 5 also more and smaller Sections could be put together. The two illustrated sections 6, 7 are fastened together on a horizontal line by means of two screw connections, each consisting of a recessed in the subsection 7 threaded sleeve 15 and an inserted through a hole in the upper section 6 screw 16.

At the foot part 4 of the lower section 7 four holes 19 are additionally admitted, through which the Statorantennenring 1 is screwed vertically vertically on the underlying terminal housing 2 vertically. In this case, a cable feedthrough is provided in the connection housing 2 in the middle under the foot part 4, where the two connecting wires 17 of the split wire winding 10 are inserted and connected to the dining and evaluation electronics located therein. To facilitate the assembly or disassembly of the stator antenna ring 1, the sole wire turn 10 of the induction coil 3 is also divided into equal sections 11, 12 as the plastic carrier ring 5. Thus, in the upper section 6 of the plastic carrier ring 5, an upper wire winding section 11 of 180 ° is likewise clamped, at the two ends of which in each case a connecting shoe 13 is soldered. These are electrically connected by the screw 15, 16 with the two cable lugs 13 of the lower wire winding section 12. The lower wire winding section 12, in turn, divides into two equal sections, which are formed by the two connecting wires 17 guided in an insulated manner to the outside. In practice, it has indeed been found that a single wire turn is sufficient for measuring signal and measurement energy transmission, but it is also conceivable to provide a plurality of radially spaced wire windings 10 arranged parallel to one another, if this would be necessary for the transmission quality. As usual with induction coils 3, the wire winding 10 is made of a copper material, which is formed as a round or flat wire to him simply and be able to claw reliably into the dovetail groove 9.

In the connection housing 2, the two connecting wires 17 of the induction coil 3 are connected to the feed and evaluation electronics located therein to ensure the inductive transmission. In this case, the terminal housing 2 is formed as a flat cuboid housing body, which does not protrude into the free inner cross section of the stator antenna ring 1. In the bottom region of the connection housing 2, two mounting plates 18 arranged alongside each other are also arranged, each having a bore, through which the stator antenna ring 1 can be screwed down to a stationary device part. By this design, the Statorantennenring 1 can be easily mounted on continuous shaft systems by being installed around a rotatable torque measuring shaft.

For the function of the telemetry system, the stator antenna ring 1 must be arranged coaxially around a rotor antenna ring rotatable in the interior, leaving a small air gap between the two antenna parts. With such an antenna device, carrier-frequency supply and measuring voltages of a rotatable torque measuring shaft can then be transmitted.

Claims (6)

1. A stator antenna ring (1) for a telemetry system for transmitting measured values and measuring energy between a rotatable measurement transducer and a stationary device component (2), wherein the stator antenna ring (1) consists of a carrier ring (5) with a groove (9) and an induction coil (3) arranged therein, and can be attached to the stationary device component (2), wherein the carrier ring (5) consists of at least two removable radial sections (6, 7) made of an isolating plastic material, wherein the induction coil (3), which consists at least of a single wire winding (10), is attached in the carrier ring (5), characterised in that the wire winding (10) likewise consists of two radial wire winding sections (11, 12) which are removable with the sections (6, 7) and that the wire winding sections (11, 12) are electrically connected to form the wire winding (10).
2. The stator antenna ring (1) according to claim 1, wherein the carrier ring (5) consists of an upper section (6) encompassing 180° and a lower section (7) encompassing 180°, which are connected to each other on an horizontal line by means of a removable screw connection (15, 16).
3. The stator antenna ring (1) according to claim 1 or 2, wherein the upper section (6) of the carrier ring (5) has a uniformly square or rectangular cross-section (14), and a circumferential dovetail groove (9), in which an upper wire winding section (11) is securely clipped in as a section of the groove, is sunk into the inner surface (8) of the upper section (6).
4. The stator antenna ring (1) according to claim 3, wherein the lower section (7) of the carrier ring (5) has a uniformly square or rectangular cross-section (14), said lower section (7) is horizontally truncated and planar at its foot section (4), and a circumferential dovetail groove (9) is sunk into the inner surface (8) of said lower section (7), into which groove a lower wire winding section (12), the connecting wires (17) of which are insulated from each other and guided perpendicularly to the outside via a vertical bore in the foot section (4), is securely clipped in as a section of said groove.
5. The stator antenna ring (1) according to any one of the preceding claims, wherein the lower section (7) of the carrier ring (5) can be attached by its foot section (4) to a horizontally arranged connection housing (2), inside which the connecting wires (17) of the induction coil (3) can be connected to an electronic power supply and evaluation unit disposed therein.
6. The stator antenna ring (1) according to any one of the preceding claims, wherein each of the two wire winding sections (11, 12) consists of a round or flat copper wire which ends flush with the inner surface (8) of the section (6, 7) of the carrier ring (5) and has a horizontally bent lug (13) attached at either end, which is connected by means of a screw connection (15, 16) to the opposite wire winding section (11, 12).

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