EP2409306B1 - Rotary transmitter and separately excited synchronous machine - Google Patents

Rotary transmitter and separately excited synchronous machine Download PDF

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Publication number
EP2409306B1
EP2409306B1 EP10708508.6A EP10708508A EP2409306B1 EP 2409306 B1 EP2409306 B1 EP 2409306B1 EP 10708508 A EP10708508 A EP 10708508A EP 2409306 B1 EP2409306 B1 EP 2409306B1
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EP
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Prior art keywords
ferrite core
rotary transmitter
winding
ferrite
transmitter according
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EP10708508.6A
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German (de)
French (fr)
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EP2409306A1 (en
Inventor
Josef Schmidt
Thomas Leichter
Klaus Schwesinger
Leobald Podbielski
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SEW Eurodrive GmbH and Co KG
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SEW Eurodrive GmbH and Co KG
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    • 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
    • H01F3/00—Cores, Yokes, or armatures

Definitions

  • the invention relates to a rotary transformer and a separately excited synchronous machine.
  • Transformers usually have a primary winding and a secondary winding, wherein such shaped ferrite cores are provided, that the losses are reduced and thus a high efficiency in the transmission can be achieved.
  • the invention is therefore based on the object to achieve a low-loss transmission in a rotary transformer.
  • the object is achieved in the rotary transformer according to the features specified in claim 1 and in the separately excited synchronous machine according to the features specified in claim 9.
  • the rotary transformer in particular a transformer rotary transformer, a primary winding and an inductively coupled to this, relative to the primary winding rotatably disposed secondary winding, wherein the windings over the same axial region or at least over a same axial portion extend the primary winding is assigned a first and the secondary winding a second ferrite core, wherein the first and second ferrite cores extend over at least a same axial portion and extend over at least a same radial portion.
  • the advantage here is that an air gap can be realized, which extends at least partially in the axial direction and is thus limited by large surfaces on the ferrite cores. In this way, a low magnetic resistance is achievable for the transformer. Therefore, since the magnetizing current component is low durable, therefore, the feeding power source or voltage source is relieved. Because the arrangement allows a higher magnetizing inductance at the same number of turns compared to the prior art. In addition, the sensitivity to air gap tolerances is reduced.
  • each ferrite core has a shape such that it essentially corresponds to a solid cylinder which has a central bore and into which a centrally arranged pineapple disk-shaped or toroidal recess is introduced, which has a smaller axial extent than the solid cylinder.
  • the ferrite core is composed of ferrite plates such that this shape is at least approximately achieved.
  • the windings each have a capacitor connected in series and / or in parallel so that the associated resonant frequency substantially corresponds to the frequency of the current fed into the primary winding.
  • the ferrite cores are each axially open.
  • the advantage here is that the ferrite cores are not the same and thus at least partially axially inserted into one another can be arranged.
  • the essential part of the magnetic flux penetrates from the first to the second ferrite core, the air gap between the first and second ferrite core in the radial direction.
  • the advantage here is that a large surface of the ferrite cores is available to limit the air gap and thus a low magnetic resistance for the field flow can be achieved.
  • the holding part of the second ferrite core is arranged on a shaft.
  • the advantage here is that the storage of the ferrite core on the storage of the shaft can be realized.
  • the two ferrite cores are axially inserted into one another or nested.
  • the advantage here is that a compact arrangement can be achieved with a few types of bearing parts.
  • the shaft protrudes through the central bore of the second ferrite core.
  • the synchronous machine has a rotatably mounted rotor on which a field winding is arranged, wherein the rotary transformer is arranged in a different axial region than the excitation winding, in particular wherein the windings of the rotary transformer axially, in particular in Rotorachs therapies, are spaced from the field winding of the synchronous machine, wherein the field winding is disposed on the rotor.
  • the advantage here is the compact execution possibility.
  • a preferably made of aluminum holding part receives the ferrite core 2 of the stator winding of the stator winding or is connected to this, for example, materially bonded.
  • the ferrite core 2 is shaped so as to receive and substantially enclose the stator winding 7, with an opening being provided in the axial direction.
  • a space region is filled radially over the stator winding with the rotor winding 6, so that the rotor winding 6 and the stator winding 7 at least partially cover a common axial portion. So they are facing each other directly radially.
  • the stator winding 7 is surrounded radially by the rotor winding 6.
  • the ferrite core 3 of the rotor winding 6 is shaped so as to receive and substantially enclose the rotor winding 7, with an opening being provided in the axial direction.
  • the ferrite cores 2 and 3 are arranged interleaved, so that the in FIG. 1 shown limbs parallel in wide axial areas.
  • the air gap between the ferrite cores 2 and 3 has in FIG. 1 an L-shaped course.
  • the entire space region of the air gap is thus composed, as it were, of an axially oriented hollow cylinder and a radially oriented hollow cylinder, which adjoin one another.
  • the ferrite cores 2 and 3 extend axially over at least a same portion. Likewise, both extend over at least one same radial Subarea. In this way, in both ferrite cores 2 and 3 each have a very large surface area the air gap between the two cores 2 and 3.
  • the cores 2 and 3 have an opening only in the axial direction, the major part of the flow penetrates the air gap in the radial direction.
  • holding parts 1 and 5 are made of aluminum, mechanical holding functions with low transmission losses can be achieved.
  • the arrangement is operated such that the primary current, for example, the current fed into the stator winding has a frequency which is between 10 and 500 kHz, in particular between 15 and 30 kHz.
  • the windings 6 and 7 can also be provided as part of a resonant circuit, so that the associated resonant frequency substantially corresponds to the frequency of the injected primary current. In this way, a high efficiency can be achieved.
  • data can also be transmitted, for which purpose higher-frequency current components are additionally modulated and demodulated on the secondary side. This data transmission is also bidirectional executable.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Synchronous Machinery (AREA)

Description

Die Erfindung betrifft einen Drehübertrager und eine fremderregte Synchronmaschine.The invention relates to a rotary transformer and a separately excited synchronous machine.

Transformatoren weisen zumeist eine Primärwicklung und eine Sekundärwicklung auf, wobei derartig geformte Ferritkerne vorgesehen sind, dass die Verluste reduziert sind und somit ein hoher Wirkungsgrad bei der Übertragung erreichbar ist.Transformers usually have a primary winding and a secondary winding, wherein such shaped ferrite cores are provided, that the losses are reduced and thus a high efficiency in the transmission can be achieved.

Aus der EP 0 680 060 A1 ist als nächstliegender Stand der Technik ein Drehübertrager bekannt.From the EP 0 680 060 A1 is known as the closest prior art, a rotary transformer.

Aus der DE 22 34 472 A1 ist ein Transformator mit relativ zueinander rotierenden koaxialen Eisenkörpern mit darin angeordneten Ringspulen bekannt.From the DE 22 34 472 A1 is a transformer with relatively rotating coaxial iron bodies with ring coils arranged therein known.

Aus der US 5 519 275 A ist eine elektrische Maschine mit Übertrager bekannt, der eine rotierende Komponente aufweist.From the US 5 519 275 A an electric machine with transformer is known which has a rotating component.

Aus der EP 0 688 028 A1 ist ein elektromagnetischer Koppler bekannt.From the EP 0 688 028 A1 An electromagnetic coupler is known.

Aus der DE 10 2005 047551 A1 ist eine Erregereinrichtung für eine elektrische Maschine bekannt.From the DE 10 2005 047551 A1 is known an exciter device for an electrical machine.

Aus der DE 10 2006 056 682 A1 ist ein System zur berührungslosen Energieübertragung bekannt.From the DE 10 2006 056 682 A1 is known a system for contactless energy transfer.

Aus der WO 2007 / 048920 A1 ist ein Drehübertrager bekannt.From the WO 2007/048920 A1 is a rotary transformer known.

Der Erfindung liegt daher die Aufgabe zugrunde, eine verlustarme Übertragung bei einem Drehübertrager zu erreichen.The invention is therefore based on the object to achieve a low-loss transmission in a rotary transformer.

Erfindungsgemäß wird die Aufgabe bei dem Drehübertrager nach den in Anspruch 1 und bei der fremderregten Synchronmaschine nach den in Anspruch 9 angegebenen Merkmalen gelöst.According to the invention, the object is achieved in the rotary transformer according to the features specified in claim 1 and in the separately excited synchronous machine according to the features specified in claim 9.

Wichtige Merkmale der Erfindung bei dem Drehübertrager sind, dass der Drehübertrager, insbesondere ein transformatorischer Drehübertrager, eine Primärwicklung und eine an diese induktiv gekoppelte, relativ zur Primärwicklung drehbar angeordnete Sekundärwicklung aufweist, wobei die Wicklungen sich über denselben axialen Bereich oder zumindest über einen gleichen axialen Teilbereich erstrecken,
der Primärwicklung ein erster und der Sekundärwicklung ein zweiter Ferritkern zugeordnet ist,
wobei der erste und der zweite Ferritkern sich über zumindest einen gleichen axialen Teilbereich erstrecken und sich zumindest über einen gleichen radialen Teilbereich erstrecken.Important features of the invention in the rotary transformer are that the rotary transformer, in particular a transformer rotary transformer, a primary winding and an inductively coupled to this, relative to the primary winding rotatably disposed secondary winding, wherein the windings over the same axial region or at least over a same axial portion extend
the primary winding is assigned a first and the secondary winding a second ferrite core,
wherein the first and second ferrite cores extend over at least a same axial portion and extend over at least a same radial portion.

Von Vorteil ist dabei, dass ein Luftspalt realisierbar ist, der sich zumindest teilweise in axialer Richtung erstreckt und somit durch große Oberflächen an den Ferritkernen begrenzt wird. Auf diese Weise ist ein geringer magnetischer Widerstand erreichbar für den Transformator. Weil somit der Magnetisierungsstromanteil gering haltbar ist, ist daher auch die einspeisende Stromquelle oder Spannungsquelle entlastbar. Denn die Anordnung ermöglicht eine höhere Magnetisierungsinduktivität bei gleicher Windungszahl im Vergleich zum Stand der Technik. Außerdem ist die Empfindlichkeit gegenüber Luftspalttoleranzen reduziert.The advantage here is that an air gap can be realized, which extends at least partially in the axial direction and is thus limited by large surfaces on the ferrite cores. In this way, a low magnetic resistance is achievable for the transformer. Therefore, since the magnetizing current component is low durable, therefore, the feeding power source or voltage source is relieved. Because the arrangement allows a higher magnetizing inductance at the same number of turns compared to the prior art. In addition, the sensitivity to air gap tolerances is reduced.

Erfindungsgemäß weist jeder Ferritkern eine derartige Form auf, dass er im Wesentlichen einem Vollzylinder entspricht, der eine Zentralbohrung aufweist und in den eine mittig angeordnete ananasscheibenförmige oder torusförmige Ausnehmung eingebracht ist, die eine geringere axiale Ausdehnung hat als der Vollzylinder, wobei der Ferritkern aus Ferritplatten derart zusammengesetzt ist, dass diese Form zumindest näherungsweise erreicht wird. Von Vorteil ist dabei, dass auch geringe Stückzahlen kostengünstig fertigbar sind, insbesondere müssen im Lager nur geringe Mengen gelagert werden. Erfindungsgemäß sind die Ferritkerne der jeweiligen Wicklung an einem jeweiligen zugeordneten Halteteil stoffschlüssig befestigt. Von Vorteil ist dabei, dass eine einfache und kostengünstige mechanische Befestigung erreichbar ist, insbesondere durch Kleben oder dergleichen. Erfindungsgemäß sind die Halteteile auf Aluminium gefertigt. Von Vorteil ist dabei, dass Verluste reduzierbar sind, insbesondere Wirbelstrombedingte Verluste.According to the invention, each ferrite core has a shape such that it essentially corresponds to a solid cylinder which has a central bore and into which a centrally arranged pineapple disk-shaped or toroidal recess is introduced, which has a smaller axial extent than the solid cylinder. wherein the ferrite core is composed of ferrite plates such that this shape is at least approximately achieved. The advantage here is that even small quantities can be manufactured inexpensively, in particular, only small quantities must be stored in the warehouse. According to the ferrite cores of the respective winding are firmly bonded to a respective associated holding part. The advantage here is that a simple and inexpensive mechanical attachment can be achieved, in particular by gluing or the like. According to the invention, the holding parts are made of aluminum. The advantage here is that losses can be reduced, in particular eddy current losses.

Bei einer vorteilhaften Ausgestaltung sind den Wicklungen jeweils eine Kapazität derart in Reihe und/oder parallel zugeschaltet, dass die zugehörige Resonanzfrequenz im Wesentlichen der Frequenz des in die Primärwicklung eingespeisten Stromes entspricht. Von Vorteil ist dabei, dass die Empfindlichkeit gegen Luftspalttoleranzen oder -änderungen noch weiter reduzierbar ist und ein hoher Wirkungsgrad erreichbar ist.In an advantageous embodiment, the windings each have a capacitor connected in series and / or in parallel so that the associated resonant frequency substantially corresponds to the frequency of the current fed into the primary winding. The advantage here is that the sensitivity to air gap tolerances or changes is even further reduced and a high efficiency can be achieved.

Bei einer vorteilhaften Ausgestaltung sind die Ferritkerne jeweils axial geöffnet ausgeführt. Von Vorteil ist dabei, dass die Ferritkerne nicht gleich ausgeführt sind und somit zumindest teilweise axial ineinander einschiebbar anordenbar sind.In an advantageous embodiment, the ferrite cores are each axially open. The advantage here is that the ferrite cores are not the same and thus at least partially axially inserted into one another can be arranged.

Bei einer vorteilhaften Ausgestaltung durchdringt der wesentliche Teil des Magnetflusses vom ersten zum zweiten Ferritkern den Luftspalt zwischen erstem und zweitem Ferritkern in radialer Richtung. Von Vorteil ist dabei, dass eine große Oberfläche der Ferritkerne zur Begrenzung des Luftspaltes bereit stellbar ist und somit ein geringer magnetischer Widerstand für den Feldfluss erreichbar ist.In an advantageous embodiment of the essential part of the magnetic flux penetrates from the first to the second ferrite core, the air gap between the first and second ferrite core in the radial direction. The advantage here is that a large surface of the ferrite cores is available to limit the air gap and thus a low magnetic resistance for the field flow can be achieved.

Bei einer vorteilhaften Ausgestaltung ist das Halteteil des zweiten Ferritkerns auf einer Welle angeordnet. Von Vorteil ist dabei, dass die Lagerung des Ferritkerns über die Lagerung der Welle realisierbar ist.In an advantageous embodiment, the holding part of the second ferrite core is arranged on a shaft. The advantage here is that the storage of the ferrite core on the storage of the shaft can be realized.

Bei einer vorteilhaften Ausgestaltung sind die beiden Ferritkerne axial ineinander eingeschoben oder verschachtelt vorgesehen. Von Vorteil ist dabei, dass eine kompakte Anordnung erreichbar ist mit wenigen Sorten an Lagerteilen.In an advantageous embodiment, the two ferrite cores are axially inserted into one another or nested. The advantage here is that a compact arrangement can be achieved with a few types of bearing parts.

Bei einer vorteilhaften Ausgestaltung ragt die Welle durch die Zentralbohrung des zweiten Ferritkerns hindurch. Von Vorteil ist dabei, dass dieser direkt oder mittels eines Halteteils auf der Welle befestigbar ist.In an advantageous embodiment, the shaft protrudes through the central bore of the second ferrite core. The advantage here is that this is fastened directly or by means of a holding part on the shaft.

Bei einer vorteilhaften Ausgestaltung ragt der durch die Ausnehmung und die Zentralbohrung ausgeprägte hohle Mittelzapfen des zweiten Ferritkerns in die Zentralbohrung des ersten Ferritkerns hinein. Von Vorteil ist dabei, dass eine verschachtelte Anordnung der beiden Ferritkerne ermöglicht ist.In an advantageous embodiment of the projecting through the recess and the central bore hollow center pin of the second ferrite core protrudes into the central bore of the first ferrite core. The advantage here is that a nested arrangement of the two ferrite cores is possible.

Wichtige Merkmale bei der fremderregten Synchronmaschine mit dem Drehübertrager sind, dass die Synchronmaschine einen drehbar gelagerten Rotor aufweist, auf dem eine Erregerwicklung angeordnet ist,
wobei der Drehübertrager in einem anderen axialen Bereich als die Erregerwicklung angeordnet ist, insbesondere wobei die Wicklungen des Drehübertragers axial, insbesondere in Rotorachsrichtung, beabstandet sind von der Erregerwicklung der Synchronmaschine, wobei die Erregerwicklung auf dem Rotor angeordnet ist. Vorteilig ist hierbei die kompakte Ausführmöglichkeit.Important features of the externally excited synchronous machine with the rotary transformer are that the synchronous machine has a rotatably mounted rotor on which a field winding is arranged,
wherein the rotary transformer is arranged in a different axial region than the excitation winding, in particular wherein the windings of the rotary transformer axially, in particular in Rotorachsrichtung, are spaced from the field winding of the synchronous machine, wherein the field winding is disposed on the rotor. The advantage here is the compact execution possibility.

Weitere Vorteile ergeben sich aus den Unteransprüchen.Further advantages emerge from the subclaims.

Die Erfindung wird nun anhand von Abbildungen näher erläutert:

  • In Figur 1 ist ein Drehübertrager gezeigt, der zwei relativ zueinander drehbar angeordnete Wicklungen umfasst. Im Folgenden wird der Einfachheit halber die erste Wicklung als Statorwicklung und die zweite Wicklung als Rotorwicklung bezeichnet. Denn die erste Wicklung ist relativ zur Umgebung fest, also stationär, vorsehbar und die zweite Wicklung ist drehbar lagerbar, beispielsweise über Kugellager, an der Welle 4.
The invention will now be explained in more detail with reference to figures:
  • In FIG. 1 a rotary transformer is shown which comprises two relatively rotatably arranged windings. In the following, the first winding is referred to as a stator winding and the second winding as a rotor winding for the sake of simplicity. Because the first winding is fixed relative to the environment, ie stationary, providable and the second winding is rotatably storable, for example via ball bearings, on the shaft. 4

Ein vorzugsweise aus Aluminium gefertigtes Halteteil nimmt den Ferritkern 2 der Statorwicklung der Statorwicklung auf oder ist mit diesem verbunden, beispielsweise stoffschlüssig.A preferably made of aluminum holding part receives the ferrite core 2 of the stator winding of the stator winding or is connected to this, for example, materially bonded.

Der Ferritkern 2 ist derart geformt, dass er die Statorwicklung 7 aufnimmt und im Wesentlichen umfasst, wobei in axialer Richtung eine Öffnung vorgesehen ist. Dabei ist ein Raumbereich radial über der Statorwicklung ausgefüllt mit der Rotorwicklung 6, so dass die Rotorwicklung 6 und die Statorwicklung 7 zumindest teilweise einen gemeinsamen axialen Teilbereich überdecken. Sie stehen sich also radial direkt gegenüber. Die Statorwicklung 7 ist von der Rotorwicklung 6 radial umgeben.The ferrite core 2 is shaped so as to receive and substantially enclose the stator winding 7, with an opening being provided in the axial direction. In this case, a space region is filled radially over the stator winding with the rotor winding 6, so that the rotor winding 6 and the stator winding 7 at least partially cover a common axial portion. So they are facing each other directly radially. The stator winding 7 is surrounded radially by the rotor winding 6.

Der Ferritkern 3 der Rotorwicklung 6 ist derart geformt, dass er die Rotorwicklung 7 aufnimmt und im Wesentlichen umfasst, wobei in axialer Richtung eine Öffnung vorgesehen ist.The ferrite core 3 of the rotor winding 6 is shaped so as to receive and substantially enclose the rotor winding 7, with an opening being provided in the axial direction.

Die Ferritkerne 2 und 3 sind ineinander verschachtelt angeordnet, so dass die in Figur 1 gezeigten Schenkel in weiten axialen Bereichen parallel verlaufen.The ferrite cores 2 and 3 are arranged interleaved, so that the in FIG. 1 shown limbs parallel in wide axial areas.

Der Luftspalt zwischen den Ferritkernen 2 und 3 hat in Figur 1 einen L-förmigen Verlauf. Der gesamte Raumbereich des Luftspaltes ist also sozusagen aus einem axial orientierten Hohlzylinder und einem radial orientierten Hohlzylinder zusammengesetzt, die aneinander angrenzen.The air gap between the ferrite cores 2 and 3 has in FIG. 1 an L-shaped course. The entire space region of the air gap is thus composed, as it were, of an axially oriented hollow cylinder and a radially oriented hollow cylinder, which adjoin one another.

Wichtig ist auch, dass die Ferritkerne 2 und 3 sich axial über zumindest einen gleichen Teilbereich erstrecken. Ebenso erstrecken sich beide über zumindest einen gleichen radialen
Teilbereich. Auf diese Weise begrenzt bei beiden Ferritkernen 2 und 3 jeweils eine sehr große Oberfläche den Luftspalt zwischen den beiden Kernen 2 und 3.It is also important that the ferrite cores 2 and 3 extend axially over at least a same portion. Likewise, both extend over at least one same radial
Subarea. In this way, in both ferrite cores 2 and 3 each have a very large surface area the air gap between the two cores 2 and 3.

Obwohl die Kerne 2 und 3 nur in axialer Richtung eine Öffnung aufweisen, durchdringt der größte Teil des Flusses den Luftspalt in radialer Richtung.Although the cores 2 and 3 have an opening only in the axial direction, the major part of the flow penetrates the air gap in the radial direction.

Da der magnetische Widerstand des Drehübertragers sehr gering ist wegen der großen den Luftspalt begrenzenden Oberflächen ist primärseitig ein kleiner Magnetisierungsstromanteil erreichbar und somit die primärseitige Spannungsquelle oder Stromquelle gering belastet.Since the magnetic resistance of the rotary transformer is very low due to the large surfaces defining the air gap, a small proportion of magnetization current can be reached on the primary side and thus the primary-side voltage source or current source is lightly loaded.

Mit der erfindungsgemäßen Anordnung ist eine hohe Magnetisierungsinduktivität erreichbar, insbesondere eine höhere wie im Stand der Technik bei gleicher Windungszahl.With the arrangement according to the invention, a high magnetizing inductance can be achieved, in particular a higher one as in the prior art with the same number of turns.

Dadurch dass die Halteteile 1 und 5 aus Aluminium ausgeführt sind, sind mechanische Haltefunktionen bei geringen Übertragungs-Verlusten erreichbar.The fact that the holding parts 1 and 5 are made of aluminum, mechanical holding functions with low transmission losses can be achieved.

Vorzugsweise wird die Anordnung derart betrieben, dass der Primärstrom, beispielsweise der in die Statorwicklung eingespeiste Strom eine Frequenz aufweist, die zwischen 10 und 500 kHz liegt, insbesondere zwischen 15 und 30 kHz.Preferably, the arrangement is operated such that the primary current, for example, the current fed into the stator winding has a frequency which is between 10 and 500 kHz, in particular between 15 and 30 kHz.

Die Wicklungen 6 und 7 sind auch als Teil einer Resonanzschaltung vorsehbar, so dass die zugehörige Resonanzfrequenz im Wesentlichen der Frequenz des eingespeisten Primärstroms entspricht. Auf diese Weise ist ein hoher Wirkungsgrad erreichbar. Darüber hinaus sind auch Daten übertragbar, wobei hierzu Stromanteile höherer Frequenz zusätzlich aufmoduliert werden und sekundärseitig wieder demoduliert werden. Dieses Datenübertragung ist auch bidirektional ausführbar.The windings 6 and 7 can also be provided as part of a resonant circuit, so that the associated resonant frequency substantially corresponds to the frequency of the injected primary current. In this way, a high efficiency can be achieved. In addition, data can also be transmitted, for which purpose higher-frequency current components are additionally modulated and demodulated on the secondary side. This data transmission is also bidirectional executable.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
Halteteilholding part
22
Ferritkern der StatorwicklungFerrite core of the stator winding
33
Ferritkern der RotorwicklungFerrite core of the rotor winding
44
Wellewave
55
Halteteilholding part
66
Rotorwicklungrotor winding
77
Statorwicklungstator

Claims (9)

  1. Rotary transmitter, in particular transformatoric rotary transmitter for supplying an excitation winding of a separately excited synchronous machine, having a primary winding (7) and a secondary winding (6) which is arranged such as to be able to rotate relative to the primary winding (7) and is inductively coupled thereto,
    wherein the windings (6, 7) extend over the same axial region or at least over an identical axial partial region,
    wherein a first ferrite core (2) is assigned to the primary winding (7) and a second ferrite core (3) is assigned to the secondary winding,
    wherein the first and the second ferrite core (2, 3) extend over at least an identical axial partial region and extend at least over an identical radial partial region,
    wherein the ferrite cores (2, 3) of the respective winding (6, 7) are attached to a respective associated retaining part (1, 5),
    wherein each ferrite core (2, 3) has substantially a shape corresponding to a full cylinder which has a central bore and in which there is formed a centrally arranged recess which has the shape of a pineapple slice or torus and which has a smaller axial extension than the full cylinder,
    characterized in that
    each ferrite core (2, 3) is composed of ferrite plates in such a way that said shape is at least approximately achieved, wherein the ferrite cores (2, 3) of the respective winding (6, 7) are materially attached to the respective associated retaining part (1, 5),
    wherein the retaining parts (1, 5) are made of aluminium.
  2. Rotary transmitter according to claim 1,
    characterized in that
    a capacitance is connected in series and/or in parallel with each of the windings in such a way that the associated resonant frequency corresponds substantially to the frequency of the current fed into the primary winding.
  3. Rotary transmitter according to at least one of the preceding claims,
    characterized in that
    the ferrite cores (2, 3) are each configured to be open in the axial direction.
  4. Rotary transmitter according to at least one of the preceding claims,
    characterized in that
    the majority of the magnetic flux from the first to the second ferrite core (2, 3) passes through the air gap between the first and second ferrite core (2, 3) in the radial direction.
  5. Rotary transmitter according to at least one of the preceding claims,
    characterized in that
    the retaining part (1, 5) of the second ferrite core (3) is arranged on a shaft (4).
  6. Rotary transmitter according to at least one of the preceding claims,
    characterized in that
    the two ferrite cores (2, 3) are provided in a manner pushed axially one inside the other or in an interleaved manner.
  7. Rotary transmitter according to at least one of the preceding claims,
    characterized in that
    a shaft (4) protrudes through the central bore of the second ferrite core (3).
  8. Rotary transmitter according to at least one of the preceding claims,
    characterized in that
    the hollow central stud of the second ferrite core (3), which is formed by the recess and the central bore, protrudes into the central bore of the first ferrite core (2).
  9. Separately excited synchronous machine having a rotary transmitter according to at least one of the preceding claims,
    wherein the synchronous machine has a rotatably mounted rotor, on which an excitation winding is arranged,
    characterized in that
    the rotary transmitter is arranged in a different axial region than the excitation winding, in particular wherein the windings of the rotary transmitter are spaced apart axially, in particular in the rotor axis direction, from the excitation winding of the synchronous machine,
    wherein the excitation winding is arranged on the rotor.
EP10708508.6A 2009-03-19 2010-03-11 Rotary transmitter and separately excited synchronous machine Active EP2409306B1 (en)

Applications Claiming Priority (2)

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PCT/EP2010/001533 WO2010105764A1 (en) 2009-03-19 2010-03-11 Rotary transmitter and separately excited synchronous machine

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