EP1665300B1 - Transformateur tournant inductif - Google Patents

Transformateur tournant inductif Download PDF

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Publication number
EP1665300B1
EP1665300B1 EP04765457A EP04765457A EP1665300B1 EP 1665300 B1 EP1665300 B1 EP 1665300B1 EP 04765457 A EP04765457 A EP 04765457A EP 04765457 A EP04765457 A EP 04765457A EP 1665300 B1 EP1665300 B1 EP 1665300B1
Authority
EP
European Patent Office
Prior art keywords
inductive
coil
rotating
transformer according
rotating transformer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Revoked
Application number
EP04765457A
Other languages
German (de)
English (en)
Other versions
EP1665300A1 (fr
Inventor
Jens Makuth
Jürgen SCHIMMER
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Application filed by Siemens AG filed Critical Siemens AG
Publication of EP1665300A1 publication Critical patent/EP1665300A1/fr
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Publication of EP1665300B1 publication Critical patent/EP1665300B1/fr
Anticipated expiration legal-status Critical
Revoked legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/18—Rotary transformers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F17/00—Fixed inductances of the signal type 
    • H01F17/0006—Printed inductances
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F17/00—Fixed inductances of the signal type 
    • H01F17/04—Fixed inductances of the signal type  with magnetic core
    • H01F17/06—Fixed inductances of the signal type  with magnetic core with core substantially closed in itself, e.g. toroid
    • H01F17/062—Toroidal core with turns of coil around it
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F19/00—Fixed transformers or mutual inductances of the signal type
    • H01F19/04—Transformers or mutual inductances suitable for handling frequencies considerably beyond the audio range
    • H01F19/08—Transformers having magnetic bias, e.g. for handling pulses
    • H01F2019/085—Transformer for galvanic isolation

Definitions

  • the invention relates to an inductive rotary transformer.
  • Data and energy transmission (telemetry) to moving machine parts is a central problem, above all in industry, in particular in and / or in distributed automation systems.
  • Production processes primarily in machine tools, robots, etc. take place on rotating or generally moving workpieces, or the tools rotate and / or move around the workpiece to be machined.
  • Data networks needed.
  • bus systems such as e.g. Fieldbus, Profibus, Ethernet, Industrial Ethernet, or FireWire, but also increasingly switchable high-performance data networks, so point-to-point connections, especially real-time Ethernet (RTE) or isochronous RTE (IRTE) used.
  • RTE real-time Ethernet
  • IRTE isochronous RTE
  • the cable drag solution prevents endless rotation and limits the production speed by the necessary reverse rotation, eg of the tools (otherwise shearing of the cables).
  • minimizing non-productive time in the system plays a crucial role in productivity.
  • a preferred solution to this secondary problem is the replacement of cable tractors by rotary joints.
  • Rotary joints are available in various designs. Applicable are touch-type transformers, e.g. mechanical slip rings, brushes or liquid mercury transformers but also non-contact transformers, such. optical, capacitive, inductive or based on radio transmission realized transformer.
  • touch-type transformers e.g. mechanical slip rings, brushes or liquid mercury transformers
  • non-contact transformers such. optical, capacitive, inductive or based on radio transmission realized transformer.
  • Capacitive transformers are expensive and are used e.g. used for military applications.
  • transmission techniques which inductively transmit or couple by means of a transformer from moving to stationary components, for example video heads.
  • this transmission technology can also be used for rotary joints.
  • Rotary transducers can be further subdivided into on-axis or off-axis systems.
  • on-axis systems the rotation axis of the rotary transformer is reserved as a data transmission path for transmitting the data.
  • this is the subject of the invention in an optical rotary transformer.
  • on-axis systems Disadvantage of on-axis systems is in particular the pre-assignment of the space, or about the rotation axis for data transmission, if this space is to be used instead of data transmission for feedthroughs, such as cables, pneumatics, hydraulics, etc. or needed.
  • From the EP 0 926 690 A1 is a transformer with a fixed part on which a primary winding is mounted, and a rotating part on which a secondary winding is mounted known.
  • the primary and secondary sides each have an iron core, the respective iron cores being separated by an air gap.
  • primary-side and secondary-side windings are also separated via a further air gap.
  • the fact that the air gap between the iron cores and the air gap between the windings can be selected independently, the transformer can be designed with a high magnetic coupling, without causing too high a magnetic resistance.
  • the magnetic coupling between primary and secondary side takes place in these transformers outside the axis of rotation of the rotary transformer.
  • US Pat. No. 5,412,266 A is a rotary transformer with a rotating part and a stationary part known. On the opposite sides of the rotating part and the stationary part are trenches in which are made of a composite material manufactured coils can be inserted. Between the coils of the rotating part and the fixed part, data transmission takes place by electromagnetic means.
  • Object of the present invention is to provide a rotary transformer for bidirectional data transmission, in which the data transmission takes place by means of inductive elements and outside the space of the rotational axis of the Drehübertragers, wherein the diameter or depth of the data transmitter should be as low as possible.
  • the two parts of the rotary transformer, the fixed and the rotating part, have a common, virtual axis of rotation, wherein the rotating part about this virtual axis of rotation rotates and the direction of rotation is arbitrary.
  • the rotary transformer preferably has a rotationally symmetrical to the virtual axis of rotation housing, which also includes the corresponding mechanism with housing, storage and seal.
  • the inductive rotary transformer has a housing which has a the virtual axis of rotation enclosing implementation.
  • the inductive rotary transformer has at the location of the axis of rotation or axis of rotation space for the realization of the implementation, since the data transmission takes place outside of this space.
  • a hollow cylindrical structure of the housing allows the spatial use about the axis of rotation for feedthroughs.
  • the space available within the bushing can be used, for example, for cables, pneumatics or hydraulics.
  • the inductive element is designed as a transformer with at least a first and a second coil, wherein the first coil is assigned to the fixed part and the second coil to the rotating part.
  • first coil is assigned to the fixed part and the second coil to the rotating part.
  • first coil is assigned to the fixed part and the second coil to the rotating part.
  • first coil can also be assigned to the rotating part and the second coil to the fixed part.
  • an inductive rotary transformer for example, a known technique, such as the video head technique, modified accordingly in a new application.
  • new production techniques are used for the production of subcomponents.
  • the rotary transformer can be realized with a very small installation depth by arranging the first coil coaxially around the second coil.
  • first and / or the second coil are designed as a toroidal coil.
  • Such an arrangement may also be referred to as a ring transformer with mutually movable windings.
  • a particularly compact construction of the inductive rotary transformer can be realized by using particularly flat coils for the inductive rotary transformer.
  • a very advantageous embodiment of the invention is in this sense characterized in that the first and / or the second coil are designed as a planar coil. Planar coils are particularly well suited for miniaturization of the inductive rotary transformer according to the invention.
  • the inductive element has means for field concentration.
  • Such agents may be, for example, ferrites, which are attached at suitable positions for guiding the magnetic flux.
  • strong field coupling between the primary and secondary windings is important.
  • a pot or Becherkern can be used to couple the first and the second coil of the transformer use.
  • various other embodiments for generating the largest possible coupling factor between primary and secondary side winding by means of field concentration conceivable.
  • the inductive rotary transformer according to the invention is provided for bidirectional data transmission and has an inductive element for each transmission direction.
  • only one inductive element can be used if a so-called hybrid circuit is used.
  • the smallest possible diameter of an inductive rotary transformer with two or more than two inductive elements is achieved when the inductive elements are arranged side by side with respect to the direction of the virtual axis of rotation.
  • an inductive rotary transformer can be realized with the smallest possible installation depth if the inductive elements are arranged coaxially interlaced.
  • the means for decoupling may be simple geometric arrangements, which are seconded between the inductive elements and there ensure a minimum distance of the inductive elements to each other
  • a particularly advantageous application results for the transformer according to the invention in that the transmitter is provided for the transmission of bus protocols, in particular Fast Ethernet protocols.
  • bus protocols such as Profibus and (Fast) Ethernet can be transmitted.
  • rotary converters for Fast Ethernet are in the focus, i. for a transmission rate of 100 Mbaud.
  • Other bus protocols, in particular other fieldbus protocols would also be transferable by modifying the input or output circuit.
  • Another advantage is the transparency in data transmission. Additional protocol layers are not necessary.
  • the field-coupled or passive rotary transformer according to the invention is designed as an integrated unit. Externally connected elements are the corresponding bus cables on both sides. A preferred embodiment allows the use of connectors.
  • the method for data transmission is then, with appropriate preparation in the fixed or in the rotating part of the optical rotary transformer, solved very easily and inexpensively.
  • all possible data buses for example Ethernet, in particular fieldbuses, for example Profibus, but also point-to-point connections, for example IRTE, can be connected, the corresponding data protocols transmitted and thus the inductive rotary transformer according to the invention integrated into any automation systems.
  • the invention can be used or used in particular in and in packaging machines, presses, plastic injection molding machines, textile machines, printing machines, machine tools, robots, handling systems, woodworking machines, glass processing machines, ceramic processing machines and hoists.
  • the rotary transformer 100 consists of a fixed part 101 and a rotating part 102. Both parts of the rotary transformer 100 have a common, imaginary, virtual axis of rotation 201, wherein the rotating part 102 rotates about this virtual axis of rotation 200, where the direction of rotation is arbitrary. Because of the rotation about the virtual axis of rotation 201, the housing of the rotary transformer 100 is preferably rotationally symmetrical, for example cylindrical, with respect to the axis of rotation 201.
  • the fixed part 101 is referred to in the mechanical sense as "stator” and the rotating part 102 as "rotor". It does not matter which part moves and which part of the rotary transformer 100 is fixed.
  • the rotary transformer 100 may be rigidly fixed mechanically, the other, second part must be rotatably mounted free of tension and must be "taken free of stress" can be. This can be achieved for example by a plastic or rubber coupling. Other Seals are also conceivable and possible. Depending on the design, any desired degree of sealing can be achieved. In addition, the maximum rotational speed depends inter alia on the quality of the storage.
  • Rotary transmitters are used in particular for data transmission, whereby corresponding cables 301, 302 lead into the two parts 101, 102 of the rotary transmitter 100, wherein, for example, a cable 302, as in FIG FIG. 1 shown, along with the rotating part 102 of the rotary transformer 100 rotates with.
  • a cable 302 as in FIG FIG. 1 shown
  • the cables are preferably by means of connectors, of which in the FIG. 1 only one plug 401 is visible, connected to the rotary transformer 100.
  • the shape of the plug is essentially arbitrary.
  • the two housing parts of the rotary transformer 100 can for example be made of steel, especially stainless steel, ceramic or plastic.
  • steel especially stainless steel, ceramic or plastic.
  • other materials such as aluminum alloys, brass, etc. are conceivable and usable.
  • the use of inexpensive materials for example ceramics or plastics, is preferred.
  • cost-effective production techniques for example injection molding technology, can be used.
  • FIG. 2 shows a schematic diagram of an inductive rotary transformer 100 according to the invention in axial design, which works with conventional coil technology, in particular conventional windings.
  • the field-coupled rotary transformer 100 according to the invention consists in principle of two tubes 101, 102 which can be rotated relative to one another.
  • the rotary transformer 100 has two inductive elements 500, 800 for data transmission, each element being assigned a channel.
  • An inductive element 500,800 consists of two coils 501,502 or coil parts with cup or pot cores 503, for example with a ferrite shell, which are separated by an air gap.
  • the inductive elements 500, 800 are located axially next to one another, which makes possible a construction with a small diameter 202. Between the inductive elements 500, 800 there is a "spacer" 600, which serves to separate the channels, and thus in particular to prevent the field coupling between the inductive elements 500, 800.
  • FIG. 3 shows a schematic diagram of an inventive inductive Drehübertragers 100 in radial design, which operates with conventional coil technology. It consists in principle of two mutually rotatable tubes 101,102.
  • the rotary transformer 100 has two inductive elements 500, 800 for data transmission, each element 500, 800 being assigned a channel.
  • An inductive element 500,800 consists of two coils 501,502 or coil parts with cup or pot cores 503, for example with a ferrite shell, which are separated by an air gap.
  • the channels or the inductive elements 500,800 are radially adjacent to each other, whereby a construction with a small installation depth 203 is possible. There may again be a spacer between the channels, which improves the separation of the channels.
  • FIG. 4 shows a schematic diagram of an inductive rotary transformer according to the invention with planar coils 501,502.
  • These coils are in principle made like printed circuit boards, ie printed circuit boards on substrate 504, made with the processes of conventional LP production.
  • the properties of coils 502,503 are simple by mechanical parameters can be calculated or simulated.
  • the finished planar coil 502, 501 is then embedded only in cup or cup cores 503.
  • the planar coils 502, 501 are in turn physically separated from one another by an air gap.
  • FIG. 5 shows a schematic diagram of a Planarspulentowns.
  • the properties of coils 501, 505 are largely determined by their geometry. For radially arranged coils with the same inductance, in principle the same coil areas are necessary with the same conductor cross section.
  • FIG. 6 shows a schematic diagram of an inductive rotary transformer according to the invention as an MID variant (molded interconnect device).
  • the MID variant offers the greatest potential in the direction of low-cost and miniaturization.
  • an inductive element 500, 800 having an inner coil body 702 and an outer coil body 701 is embodied, the outer coil body 701 concentrically enclosing the inner coil body 702.
  • coils 501 are embedded, the windings in the axial direction, d. h in the direction of the virtual axis of rotation, are arranged side by side.
  • coils 502 are embedded in the inner bobbin 702, whose windings in the axial direction, d. h in the direction of the virtual axis of rotation, are arranged side by side.
  • the coils 501 of the outer bobbin 701 may be considered as a primary winding of a transformer whose secondary side windings are represented by the coils 502 on the inner bobbin 702.
  • the primary and secondary sides of the inductive element 500 are separated by an air gap 704, within which a bearing is provided which allows a rotation of one of the bobbins 701, 702.
  • the rotary transformer is designed with two axially juxtaposed inductive elements 500.800, whereby two transmission channels can be realized.
  • the number of channels or inductive elements is of course scalable.
  • the production of Drehfaners is particularly cost.
  • the HF magnets 705 and the coils 502 are positioned and overmoulded with plastic.
  • Post-processing such as Etching (in terms of ablation) of auxiliary structures is possible.
  • the recordings for storage can be produced.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)
  • Near-Field Transmission Systems (AREA)
  • Coils Or Transformers For Communication (AREA)

Claims (11)

  1. Transmetteur (100) tournant inductif pour la transmission de données, comprenant une partie (101) à poste fixe et une partie (102) rotative, la partie (102) rotative et la partie (101) à poste fixe ayant un axe (201) de rotation virtuel commun, et la partie (102) rotative tournant autour de la partie (101) à poste fixe, et la transmission de données s'effectuant sur au moins un parcours de transmission de données au moyen d'au moins un élément (500, 800) inductif, et le parcours de transmission de données étant disposé en dehors de l'axe (201) de rotation du transmetteur (100) tournant, et le transmetteur (100) étant prévu pour la transmission bidirectionnelle de données et comportant un élément inductif pour chaque sens de transmission,
    caractérisé en ce que les éléments (500, 800) inductifs sont disposés les uns à côté des autres par rapport à la direction de l'axe (201) de rotation virtuel, ou bien les éléments (500, 800) inductifs sont disposés en étant coaxialement imbriqués les uns dans les autres.
  2. Transmetteur tournant inductif suivant la revendication 1, caractérisé en ce que le transmetteur (100) tournant inductif comporte un boîtier qui comprend un passage entourant l'axe (201) de rotation virtuel.
  3. Transmetteur tournant inductif suivant la revendication 1 ou 2, caractérisé en ce que l'élément (500, 800) inductif est réalisé sous forme de transformateur doté d'au moins une première et une deuxième bobines, la première (501, 502, 503) bobine étant associée à la partie à poste fixe et la deuxième bobine à la partie rotative.
  4. Transmetteur tournant inductif suivant la revendication 3, caractérisé en ce que la première et la deuxième bobines (501, 502, 503) sont disposés les unes à côté des autres par rapport à la direction de l'axe de rotation virtuel.
  5. Transmetteur tournant inductif suivant la revendication 3 ou 4, caractérisé en ce que la première bobine est disposée coaxialement autour de la deuxième bobine (501, 502, 503).
  6. Transmetteur tournant inductif suivant l'une des revendications 3 à 5, caractérisé en ce que la première et/ou la deuxième bobines (501, 502, 503) sont réalisées sous la forme de bobines toroïdales.
  7. Transmetteur tournant inductif suivant l'une des revendications 3 à 5, caractérisé en ce que la première et/ou la deuxième bobines (501, 502, 503) sont réalisées sous la forme de bobines planaires.
  8. Transmetteur tournant inductif suivant l'une des revendications précédentes, caractérisé en ce que l'élément (500, 800) inductif comprend des moyens (705) de concentration de champ.
  9. Transmetteur tournant inductif suivant l'une des revendications précédentes, caractérisé en ce que des moyens de découplage de champs magnétiques sont disposés entre les éléments (500, 800) inductifs.
  10. Transmetteur tournant inductif suivant l'une des revendications précédentes, caractérisé en ce que le transmetteur (100) est prévu pour transmettre des protocoles de bus, notamment des protocoles Ethernet rapides.
  11. Transmetteur tournant inductif suivant l'une des revendications précédentes, caractérisé en ce que le transmetteur (100) tournant inductif est réalisé sous la forme d'une unité intégrée.
EP04765457A 2003-09-23 2004-09-21 Transformateur tournant inductif Revoked EP1665300B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10344055A DE10344055A1 (de) 2003-09-23 2003-09-23 Induktiver Drehübertrager
PCT/EP2004/010581 WO2005031770A1 (fr) 2003-09-23 2004-09-21 Emetteur tournant inductif

Publications (2)

Publication Number Publication Date
EP1665300A1 EP1665300A1 (fr) 2006-06-07
EP1665300B1 true EP1665300B1 (fr) 2008-07-16

Family

ID=34353019

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04765457A Revoked EP1665300B1 (fr) 2003-09-23 2004-09-21 Transformateur tournant inductif

Country Status (5)

Country Link
US (1) US7663462B2 (fr)
EP (1) EP1665300B1 (fr)
CN (1) CN1856849B (fr)
DE (2) DE10344055A1 (fr)
WO (1) WO2005031770A1 (fr)

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Also Published As

Publication number Publication date
WO2005031770A1 (fr) 2005-04-07
DE10344055A1 (de) 2005-04-21
US7663462B2 (en) 2010-02-16
EP1665300A1 (fr) 2006-06-07
CN1856849A (zh) 2006-11-01
US20070024575A1 (en) 2007-02-01
CN1856849B (zh) 2012-04-04
DE502004007626D1 (de) 2008-08-28

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