EP0797224A1 - Choke coil for an intermediate circuit short-circuit device - Google Patents
Choke coil for an intermediate circuit short-circuit device Download PDFInfo
- Publication number
- EP0797224A1 EP0797224A1 EP97103949A EP97103949A EP0797224A1 EP 0797224 A1 EP0797224 A1 EP 0797224A1 EP 97103949 A EP97103949 A EP 97103949A EP 97103949 A EP97103949 A EP 97103949A EP 0797224 A1 EP0797224 A1 EP 0797224A1
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- European Patent Office
- Prior art keywords
- coil
- choke coil
- short
- circuit
- winding
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- 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.)
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F37/00—Fixed inductances not covered by group H01F17/00
- H01F37/005—Fixed inductances not covered by group H01F17/00 without magnetic core
Definitions
- the invention relates to a choke coil for an intermediate circuit short circuit.
- a short-circuiting device has a choke coil and a semiconductor component, for example a thyristor or a thyristor (GTO thyristor) which can be switched off.
- the choke coil and the semiconductor component are electrically connected in series.
- This short-circuiting device is connected to this direct voltage supply for the electrical bridging of the two connection poles of a direct voltage supply feeding an inverter.
- the choke coil is provided to limit the short-circuit current, which can become very high by discharging a smoothing capacitor of the DC voltage sources.
- Choke coils for converters are often constructed without their own winding carriers. In addition, however, it is generally known to manufacture choke coils with a choke winding wound on a cylindrical winding support. When using a choke coil in a power converter is among other things it is important that the choke coil does not emit strong external magnetic fields and that it is of compact construction.
- a choke coil with a choke winding wound on a cylindrical, rod-shaped or tubular winding support made of an electrically insulating material as partial windings in which the winding support has at least two winding support sections for use in a converter. These winding carrier sections are connected to one another via connecting parts.
- the winding carrier sections each carrying the partial windings of the choke winding are arranged according to the toroid principle in such a way that the magnetic fields generated partially cancel or weaken one another in terms of their outward effect.
- magnetic shielding caps are placed over the connecting parts.
- FIG. 1 of this German patent specification shows a first variant of the choke coil, which consists of four separately rod-shaped or tubular winding support sections, which are arranged in the form of a rectangle, preferably a square.
- the winding of the choke coil is in the form of four partial windings on the cylindrical winding carrier sections.
- the square choke coil houses a semiconductor component of a short-circuiter in coil windows.
- the dimensions of a clamping plate belonging to a clamping device for the semiconductor component are exactly adapted to the coil window of the choke coil.
- the current rise limiting choke of the short-circuiting device which is connected electrically in series with the semiconductor component, is arranged in the tube interior of a winding carrier section.
- This current rise limiting choke has a winding wound around a rod-shaped winding core, the winding ends of which are externally accessible via contact connections.
- Such a compactly designed choke coil with integrated short-circuiting device and integrated current limiting choke is preferably used in one oil-cooled converter module of an inverter.
- an air choke coil was used as the current limiting choke of an intermediate circuit short circuiter, this air choke coil would emit a strong external magnetic field. Since an air choke coil does not have a winding carrier, it is difficult to assemble it because large magnetic forces act on its connections.
- the invention is based on the object of specifying a choke coil for an intermediate circuit short-circuiter, the external magnetic fields of which are of little effect and which can be assembled without great effort.
- the choke coil has a multi-turn solenoid and a short-circuit coil consisting of a winding, these coils are arranged axially to one another and the winding ends of this solenoid are each provided with a contact connection.
- this choke coil does not emit strong external magnetic fields, but is more compact than a choke coil, the winding of which is wound according to the toroid principle.
- This choke coil shows the effect of a transformer, the secondary winding of which is short-circuited. Due to the transmission ratio of the solenoid consisting of several turns to the short-circuit coil consisting of one turn, this choke coil has a very high resistance, so that the coil quality is small. As a result, the choke coil has high dynamic losses, ie it has a high damping effect.
- This choke coil has a solenoid 2 and a short-circuit coil 4.
- the solenoid 2 consists of a winding 6 which has several turns.
- the short-circuit coil 4 consists of a winding with one turn.
- a metal tube is provided as short-circuit coil 4, the wall thickness of which is dimensioned such that a predetermined amount of energy of the intermediate circuit capacitor of a converter can be absorbed in the form of heat when the intermediate circuit short-circuiter is used according to the invention.
- the winding 6 of the solenoid 2 can be wound from a strip conductor or, as shown here, from a wire conductor.
- the winding 6 of the solenoid 2 is wound on the short-circuit coil 4; ie the short-circuit coil 4 also serves as a winding support for the winding 6 of the solenoid 2.
- the two winding ends of the solenoid 2 are each provided with a contact connection 8 and 10. As shown, these contact connections 8 and 10 can be attached to the front of the choke coil. However, there is also the possibility of arranging the contact connections 8 and 10 together on one end face of the inductor.
- the short-circuit coil 4, which can be a steel, copper or brass tube, is arranged, for example, in the interior of the solenoid 2 symmetrically to its central axis 12.
- the solenoid 2 can be arranged in the short-circuit coil 4.
- the spatial, axially symmetrical arrangement of these two coils 2 and 4 of the choke coil does not change the mode of operation of this choke coil.
- the arrangement in which the short-circuit coil 4 also serves as a winding support is preferred.
- This choke coil according to the invention has the effect of a transformer with a short-circuited secondary winding, as a result of which this choke coil has a high resistance due to the transmission ratio of solenoid 2 to short-circuit coil 4.
- this choke coil has a significantly higher damping than an air choke coil, with simultaneous faster discharge of an intermediate circuit capacitor.
- the swinging current is halved in amplitude after actuation of the short-circuiting device, as a result of which the energy stored in the choke coil is reduced by 3 ⁇ 4 compared to the stored energy of the intermediate circuit capacitor.
- this energy is converted into heat in the short-circuit coil 4. Since this choke coil does not emit strong external magnetic fields, this choke coil can be mechanically fixed to a carrier in the converter, for example by means of cable ties. In addition, the magnetic forces on the contact connections 8 and 10 of this choke coil are reduced.
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
- Rectifiers (AREA)
- Coils Or Transformers For Communication (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
Description
Die Erfindung bezieht sich auf eine Drosselspule für einen Zwischenkreis-Kurzschließer.The invention relates to a choke coil for an intermediate circuit short circuit.
Es ist allgemein bekannt, zum Schutz von abschaltbaren Leistungshalbleitern eines an einem Gleichspannungs-Zwischenkreis betriebenen Wechselrichters bei Ausgangskurzschlüssen, Überströmen oder Überspannungen alle Leistungshalbleiter der am selben Gleichspannungs-Zwischenkreis angeschlossenen Stromrichter und gegebenenfalls zusätzliche Kurzschließer-Thyristoren einzuschalten. Durch diese Schutzdurchzündung wird die Zwischenkreisspannung sehr schnell abgebaut, wobei sich der Kurzschlußstrom auf viele Zweige verteilt. Die Strombelastung der einzelnen Leistungshalbleiter bleibt dadurch innerhalb des zulässigen Bereiches und die Halbleiter überstehen den Kurzschluß unbeschadet. Eine Anwendung dieses Schutzverfahrens ist vorzugsweise bei GTO-Pulswechselrichtern für Traktionsantriebe möglich.It is generally known to protect all power semiconductors of the power converters connected to the same DC voltage intermediate circuit and, if necessary, additional short-circuiting thyristors to protect switchable power semiconductors of an inverter operated on a DC voltage intermediate circuit in the event of output short circuits, overcurrents or overvoltages. Due to this protective ignition, the intermediate circuit voltage is reduced very quickly, the short-circuit current being distributed over many branches. The current load of the individual power semiconductors thus remains within the permissible range and the semiconductors survive the short circuit without damage. This protection method can preferably be used with GTO pulse inverters for traction drives.
Ein Kurzschließer weist eine Drosselspule und ein Halbleiterbauelement, beispielsweise ein Thyristor oder einen abschaltbaren Thyristor (GTO-Thyristor) auf. Die Drosselspule und das Halbleiterbauelement sind elektrisch in Reihe geschaltet. Dieser Kurzschließer ist zur elektrischen Überbrückung der beiden Anschlußpole einer einen Wechselrichter speisenden Gleichspannungszuführung mit dieser Gleichspannungszuführung verbunden. Die Drosselspule ist zur Begrenzung des Kurzschlußstromes vorgesehen, der durch Entladung eines Glättungskondensators der Gleichspannungsquellen sehr hoch werden kann.A short-circuiting device has a choke coil and a semiconductor component, for example a thyristor or a thyristor (GTO thyristor) which can be switched off. The choke coil and the semiconductor component are electrically connected in series. This short-circuiting device is connected to this direct voltage supply for the electrical bridging of the two connection poles of a direct voltage supply feeding an inverter. The choke coil is provided to limit the short-circuit current, which can become very high by discharging a smoothing capacitor of the DC voltage sources.
Drosselspulen für Stromrichter sind häufig ohne eigenen Wicklungsträger aufgebaut. Daneben ist jedoch allgemein bekannt, Drosselspulen mit einer auf einem zylinderförmigen Wicklungsträger aufgewickelten Drosselwicklung herzustellen. Beim Einsatz einer Drosselspule in einem Stromrichter ist unter anderem von Wichtigkeit, daß die Drosselspule keine starken äußeren Magnetfelder abgibt und daß sie kompakt aufgebaut ist.Choke coils for converters are often constructed without their own winding carriers. In addition, however, it is generally known to manufacture choke coils with a choke winding wound on a cylindrical winding support. When using a choke coil in a power converter is among other things it is important that the choke coil does not emit strong external magnetic fields and that it is of compact construction.
Aus dem deutschen Patent 40 08 424 ist eine Drosselspule mit einer auf einem zylinderförmigen, stab- oder rohrförmigen Wicklungsträger aus einem elektrisch isolierenden Material als Teilwicklungen aufgewickelten Drosselwicklung bekannt, bei der zur Anwendung bei einem Stromrichter der Wicklungsträger mindestens zwei Wicklungsträgerabschnitte aufweist. Diese Wicklungsträgerabschnitte sind über Verbindungsteile miteinander verbunden. Die jeweils die Teilwicklungen der Drosselwicklung tragenden Wicklungsträgerabschnitte sind gemäß dem Toroid-Prinzip derart angeordnet, daß sich die erzeugten Magnetfelder in ihrer Wirkung nach außen gegenseitig teilweise aufheben bzw. abschwächen. Außerdem sind über die Verbindungsteile jeweils magnetische Abschirmkappen gestülpt.From German patent 40 08 424, a choke coil with a choke winding wound on a cylindrical, rod-shaped or tubular winding support made of an electrically insulating material as partial windings is known, in which the winding support has at least two winding support sections for use in a converter. These winding carrier sections are connected to one another via connecting parts. The winding carrier sections each carrying the partial windings of the choke winding are arranged according to the toroid principle in such a way that the magnetic fields generated partially cancel or weaken one another in terms of their outward effect. In addition, magnetic shielding caps are placed over the connecting parts.
In der Figur 1 dieser genannten deutschen Patentschrift ist eine erste Variante der Drosselspule dargestellt, die aus vier getrennt jeweils stab- oder rohrförmigen Wicklungsträgerabschnitten besteht, die in Form eines Rechtecks, vorzugsweise eines Quadrates angeordnet sind. Die Wicklung der Drosselspule befindet sich in Form von vier Teilwicklungen auf den zylinderförmigen Wicklungsträgerabschnitten. Die quadratische Drosselspule beherbergt in Spulenfenstern ein Halbleiterbauelement eines Kurzschließers. Dabei ist eine zu einer Spannvorrichtung für das Halbleiterbauelement gehörige Spannplatte in ihren Abmessungen exakt dem Spulenfenster der Drosselspule angepaßt. Die Stromanstiegsbegrenzungsdrossel des Kurzschließers, die elektrisch in Reihe mit dem Halbleiterbauelement geschaltet ist, ist im Rohrinneren eines Wicklungsträgerabschnittes angeordnet. Diese Stromanstiegsbegrenzungsdrossel weist eine um einen stabförmigen Wicklungskern gewickelte Wicklung auf, deren Wicklungsenden über Kontaktanschlüsse extern zugänglich sind. Eine derartig kompakt aufgebaute Drosselspule mit integriertem Kurzschließer und integrierter Strombegrenzungsdrossel wird vorzugsweise bei einem ölgekühlten Stromrichtermodul eines Wechselrichters eingesetzt.FIG. 1 of this German patent specification shows a first variant of the choke coil, which consists of four separately rod-shaped or tubular winding support sections, which are arranged in the form of a rectangle, preferably a square. The winding of the choke coil is in the form of four partial windings on the cylindrical winding carrier sections. The square choke coil houses a semiconductor component of a short-circuiter in coil windows. The dimensions of a clamping plate belonging to a clamping device for the semiconductor component are exactly adapted to the coil window of the choke coil. The current rise limiting choke of the short-circuiting device, which is connected electrically in series with the semiconductor component, is arranged in the tube interior of a winding carrier section. This current rise limiting choke has a winding wound around a rod-shaped winding core, the winding ends of which are externally accessible via contact connections. Such a compactly designed choke coil with integrated short-circuiting device and integrated current limiting choke is preferably used in one oil-cooled converter module of an inverter.
Bei der Verwendung einer Luftdrosselspule als Strombegrenzungsdrossel eines Zwischenkreis-Kurzschließers würde diese Luftdrosselspule ein starkes äußeres Magnetfeld abgeben. Da eine Luftdrosselspule keinen Wicklungsträger aufweist, ist ihre Montage schwierig, da große magnetische Kräfte auf deren Anschlüsse einwirken.If an air choke coil was used as the current limiting choke of an intermediate circuit short circuiter, this air choke coil would emit a strong external magnetic field. Since an air choke coil does not have a winding carrier, it is difficult to assemble it because large magnetic forces act on its connections.
Der Erfindung liegt nun die Aufgabe zugrunde, eine Drosselspule für einen Zwischenkreis-Kurzschließer anzugeben, deren nach außen abgegebene Magnetfelder nur von geringer Wirkung sind und die ohne großen Aufwand montiert werden kann.The invention is based on the object of specifying a choke coil for an intermediate circuit short-circuiter, the external magnetic fields of which are of little effect and which can be assembled without great effort.
Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß die Drosselspule eine aus mehreren Windungen bestehende Zylinderspule und eine aus einer Wicklung bestehende Kurzschlußspule aufweist, wobei diese Spulen axial zueinander angeordnet sind und wobei die Wicklungsenden dieser Zylinderspule jeweils mit einem Kontaktanschluß versehen sind.This object is achieved in that the choke coil has a multi-turn solenoid and a short-circuit coil consisting of a winding, these coils are arranged axially to one another and the winding ends of this solenoid are each provided with a contact connection.
Durch die Ausgestaltung der Drosselspule gibt diese Drosselspule keine starken äußeren Magnetfelder ab, ist aber gegenüber einer Drosselspule, deren Wicklung gemäß dem Toroid-Prinzip gewickelt ist, kompakter. Diese Drosselspule zeigt die Wirkung eines Transformators, dessen Sekundärwicklung kurzgeschlossen ist. Durch das Übersetzungsverhältnis von der aus mehreren Windungen bestehenden Zylinderspule zur aus einer Windung bestehenden Kurzschlußspule wirkt diese Drosselspule sehr hochohmig, wodurch die Spulengüte klein ist. Dadurch hat die Drosselspule hohe dynamische Verluste, d. h. sie hat eine hohe dämpfende Wirkung. Das heißt, die Amplitude des Umschwingstromes wird nach Betätigen des Kurzschließers erheblich gedämpft, so daß ein großer Teil der im Zwischenkreiskondensator gespeicherten Energie mit Hilfe der Kurzschlußwicklung in Wärme umgewandelt wird. Da diese Drosselspule keine starken äußeren Magnetfelder abgibt, werden keine hohen Anforderungen mehr an deren Montage im Stromrichter gestellt.Due to the design of the choke coil, this choke coil does not emit strong external magnetic fields, but is more compact than a choke coil, the winding of which is wound according to the toroid principle. This choke coil shows the effect of a transformer, the secondary winding of which is short-circuited. Due to the transmission ratio of the solenoid consisting of several turns to the short-circuit coil consisting of one turn, this choke coil has a very high resistance, so that the coil quality is small. As a result, the choke coil has high dynamic losses, ie it has a high damping effect. This means that the amplitude of the swinging current is considerably damped after the short-circuiter is actuated, so that a large part of the energy stored in the intermediate circuit capacitor is converted into heat using the short-circuit winding. Because this choke coil no strong external magnetic fields are emitted, there are no longer high demands on their installation in the converter.
Vorteilhafte Ausgestaltungen der erfindungsgemäßen Drosselspule sind den Unteransprüchen 2 bis 9 zu entnehmen.Advantageous refinements of the choke coil according to the invention can be found in subclaims 2 to 9.
Zur weiteren Erläuterung der Erfindung wird auf die Zeichnung Bezug genommen, in der eine Ausführungsform der erfindungsgemäßen Drosselspule schematisch veranschaulicht ist.To further explain the invention, reference is made to the drawing, in which an embodiment of the choke coil according to the invention is schematically illustrated.
In dieser Figur ist ein Schnitt durch eine erfindungsgemäße Drosselspule für einen Zwischenkreis-Kurzschließer dargestellt. Diese Drosselspule weist eine Zylinderspule 2 und eine Kurzschlußspule 4 auf. Die Zylinderspule 2 besteht aus einer Wicklung 6, die mehrere Windungen aufweist. Die Kurzschlußspule 4 besteht aus einer Wicklung mit einer Windung. Als Kurzschlußspule 4 ist hier ein Metallrohr vorgesehen, dessen Wandstärke so bemessen ist, daß eine vorbestimmte Energiemenge des Zwischenkreiskondensators eines Stromrichters in Form von Wärme beim erfindungsgemäßen Gebrauch des Zwischenkreis-Kurzschließers aufgenommen werden kann. Die Wicklung 6 der Zylinderspule 2 kann aus einem Bandleiter oder wie hier dargestellt aus einem Drahtleiter gewickelt werden. Bei der hier dargestellten vorteilhaften Ausführungsform der Drosselspule ist die Wicklung 6 der Zylinderspule 2 auf die Kurzschlußspule 4 gewickelt; d. h. die Kurzschlußspule 4 dient gleichzeitig als Wicklungsträger für die Wicklung 6 der Zylinderspule 2. Die beiden Wicklungsenden der Zylinderspule 2 sind jeweils mit einem Kontaktanschluß 8 und 10 versehen. Diese Kontaktanschlüsse 8 und 10 können wie dargestellt stirnseitig der Drosselspule angebracht sein. Es besteht jedoch auch die Möglichkeit, die Kontaktanschlüsse 8 und 10 gemeinsam an einer Stirnseite der Drosselspule anzuordnen. Die Kurzschlußspule 4, die ein Stahl-, Kupfer- oder Messingrohr sein kann, ist beispielsweise im Inneren der Zylinderspule 2 symmetrisch zu deren Mittelachse 12 angeordnet.In this figure, a section through a choke coil according to the invention for an intermediate circuit short-circuiter is shown. This choke coil has a solenoid 2 and a short-circuit coil 4. The solenoid 2 consists of a winding 6 which has several turns. The short-circuit coil 4 consists of a winding with one turn. A metal tube is provided as short-circuit coil 4, the wall thickness of which is dimensioned such that a predetermined amount of energy of the intermediate circuit capacitor of a converter can be absorbed in the form of heat when the intermediate circuit short-circuiter is used according to the invention. The winding 6 of the solenoid 2 can be wound from a strip conductor or, as shown here, from a wire conductor. In the advantageous embodiment of the choke coil shown here, the winding 6 of the solenoid 2 is wound on the short-circuit coil 4; ie the short-circuit coil 4 also serves as a winding support for the winding 6 of the solenoid 2. The two winding ends of the solenoid 2 are each provided with a
Außerdem kann die Zylinderspule 2 in der Kurzschlußspule 4 angeordnet werden. Die räumliche, achssymmetrische Anordnung dieser beiden Spulen 2 und 4 der Drosselspule verändert nicht die Wirkungsweise dieser Drosselspule. Bevorzugt wird die Anordnung, bei der die Kurzschlußspule 4 gleichzeitig als Wicklungsträger dient.In addition, the solenoid 2 can be arranged in the short-circuit coil 4. The spatial, axially symmetrical arrangement of these two coils 2 and 4 of the choke coil does not change the mode of operation of this choke coil. The arrangement in which the short-circuit coil 4 also serves as a winding support is preferred.
Diese erfindungsgemäße Drosselspule hat die Wirkung eines Transformators mit kurzgeschlossener Sekundärwicklung, wodurch diese Drosselspule durch das Übersetzungsverhältnis von Zylinderspule 2 zu Kurzschlußspule 4 hochohmig wirkt. Dadurch weist diese Drosselspule eine deutlich höhere Dämpfung gegenüber einer Luftdrosselspule auf, und zwar bei gleichzeitiger schnellerer Entladung eines Zwischenkreiskondensators. Das heißt, der Umschwingstrom wird nach Betätigung des Kurzschließers in seiner Amplitude halbiert, wodurch sich die in der Drosselspule gespeicherte Energie gegenüber der gespeicherten Energie des Zwischenkreiskondensators um ¾ reduziert. Beim Umschwingvorgang wird diese Energie in der Kurzschlußspule 4 in Wärme umgesetzt. Da diese Drosselspule keine starken äußeren Magnetfelder abgibt, kann man diese Drosselspule beispielsweise mittels Kabelbinder an einem Träger im Stromrichter mechanisch fixieren. Außerdem reduzieren sich die magnetischen Kräfte auf die Kontaktanschlüsse 8 und 10 dieser Drosselspule.This choke coil according to the invention has the effect of a transformer with a short-circuited secondary winding, as a result of which this choke coil has a high resistance due to the transmission ratio of solenoid 2 to short-circuit coil 4. As a result, this choke coil has a significantly higher damping than an air choke coil, with simultaneous faster discharge of an intermediate circuit capacitor. This means that the swinging current is halved in amplitude after actuation of the short-circuiting device, as a result of which the energy stored in the choke coil is reduced by ¾ compared to the stored energy of the intermediate circuit capacitor. During the swinging process, this energy is converted into heat in the short-circuit coil 4. Since this choke coil does not emit strong external magnetic fields, this choke coil can be mechanically fixed to a carrier in the converter, for example by means of cable ties. In addition, the magnetic forces on the
Claims (9)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE29605381U | 1996-03-22 | ||
| DE29605381U DE29605381U1 (en) | 1996-03-22 | 1996-03-22 | Choke coil for a DC link short-circuiter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP0797224A1 true EP0797224A1 (en) | 1997-09-24 |
Family
ID=8021551
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP97103949A Withdrawn EP0797224A1 (en) | 1996-03-22 | 1997-03-10 | Choke coil for an intermediate circuit short-circuit device |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0797224A1 (en) |
| DE (1) | DE29605381U1 (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE497989C (en) * | 1930-05-17 | Bbc Brown Boveri & Cie | Overcurrent protection inductor | |
| JPS6083310A (en) * | 1983-10-13 | 1985-05-11 | Kansai Electric Power Co Inc:The | Neutral point grounding reactor apparatus |
| US4855552A (en) * | 1986-10-01 | 1989-08-08 | Hydro-Quebec | Fluid heating device incorporating transformer secondary winding having a single electrical turn and cooling means optimized for heat transfer |
| EP0353449A1 (en) * | 1988-08-02 | 1990-02-07 | Asea Brown Boveri Ag | Inductive current limitation device for an alternating current using the superconductivity superconductor |
| EP0504610A1 (en) * | 1991-03-20 | 1992-09-23 | GMV MARTINI S.p.A. | Device for reducing current peaks during starting of an asynchronous motor |
| EP0620630A1 (en) * | 1993-03-26 | 1994-10-19 | Ngk Insulators, Ltd. | Superconducting fault current limiter |
| DE4411645A1 (en) * | 1994-04-02 | 1995-10-05 | Daimler Benz Ag | Choke coil with current-dependent inductance |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1076576A (en) * | 1963-06-05 | 1967-07-19 | English Electric Co Ltd | Improvements in or relating to electrical inductors |
| US3380008A (en) * | 1965-12-02 | 1968-04-23 | Navy Usa | Inductive-kick suppression solenoid |
| FI69944C (en) * | 1984-06-27 | 1986-05-26 | Kone Oy | SAETT ATT PLACERA DROSSLAR MED LUFTKAERNA |
| DE4008424A1 (en) * | 1990-03-16 | 1991-09-19 | Asea Brown Boveri | Inductance coil for an inverter - has coil former constructed from four sections with corner inserts |
| JPH04199502A (en) * | 1990-11-29 | 1992-07-20 | Mitsubishi Electric Corp | Lc composite element |
-
1996
- 1996-03-22 DE DE29605381U patent/DE29605381U1/en not_active Expired - Lifetime
-
1997
- 1997-03-10 EP EP97103949A patent/EP0797224A1/en not_active Withdrawn
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE497989C (en) * | 1930-05-17 | Bbc Brown Boveri & Cie | Overcurrent protection inductor | |
| JPS6083310A (en) * | 1983-10-13 | 1985-05-11 | Kansai Electric Power Co Inc:The | Neutral point grounding reactor apparatus |
| US4855552A (en) * | 1986-10-01 | 1989-08-08 | Hydro-Quebec | Fluid heating device incorporating transformer secondary winding having a single electrical turn and cooling means optimized for heat transfer |
| EP0353449A1 (en) * | 1988-08-02 | 1990-02-07 | Asea Brown Boveri Ag | Inductive current limitation device for an alternating current using the superconductivity superconductor |
| EP0504610A1 (en) * | 1991-03-20 | 1992-09-23 | GMV MARTINI S.p.A. | Device for reducing current peaks during starting of an asynchronous motor |
| EP0620630A1 (en) * | 1993-03-26 | 1994-10-19 | Ngk Insulators, Ltd. | Superconducting fault current limiter |
| DE4411645A1 (en) * | 1994-04-02 | 1995-10-05 | Daimler Benz Ag | Choke coil with current-dependent inductance |
Non-Patent Citations (1)
| Title |
|---|
| PATENT ABSTRACTS OF JAPAN vol. 009, no. 225 (E - 342) 11 September 1985 (1985-09-11) * |
Also Published As
| Publication number | Publication date |
|---|---|
| DE29605381U1 (en) | 1996-06-20 |
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