EP0778992A1 - Circuit permettant d'eviter l'emergence de problemes au niveau des balais - Google Patents

Circuit permettant d'eviter l'emergence de problemes au niveau des balais

Info

Publication number
EP0778992A1
EP0778992A1 EP95928389A EP95928389A EP0778992A1 EP 0778992 A1 EP0778992 A1 EP 0778992A1 EP 95928389 A EP95928389 A EP 95928389A EP 95928389 A EP95928389 A EP 95928389A EP 0778992 A1 EP0778992 A1 EP 0778992A1
Authority
EP
European Patent Office
Prior art keywords
rotor
current
winding
brush
secondary winding
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.)
Withdrawn
Application number
EP95928389A
Other languages
German (de)
English (en)
Inventor
Walter Schumacher
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.)
Andritz Hydro GmbH Austria
Original Assignee
Andritz Hydro GmbH Austria
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
Application filed by Andritz Hydro GmbH Austria filed Critical Andritz Hydro GmbH Austria
Publication of EP0778992A1 publication Critical patent/EP0778992A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
    • H02P25/16—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring
    • H02P25/24—Variable impedance in stator or rotor circuit
    • H02P25/26—Variable impedance in stator or rotor circuit with arrangements for controlling secondary impedance
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R39/00—Rotary current collectors, distributors or interrupters
    • H01R39/02—Details for dynamo electric machines
    • H01R39/58—Means structurally associated with the current collector for indicating condition thereof, e.g. for indicating brush wear
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K19/00—Synchronous motors or generators
    • H02K19/16—Synchronous generators
    • H02K19/36—Structural association of synchronous generators with auxiliary electric devices influencing the characteristic of the generator or controlling the generator, e.g. with impedances or switches

Definitions

  • the invention relates to a circuit arrangement for preventing brush test strips in slip ring machines due to strongly fluctuating loads, the transmission of the rotor current taking place via brushes and slip rings.
  • Carbon brushes are used for power transmission in both commutators and slip rings in electrical machines. Commutators or slip rings are constantly worn during operation and must be maintained. With regard to the current carrying capacity and the brush contact pressure, a distinction must be made as to whether the brush is used as a commutator brush or as a slip ring brush. In both cases, there is usually a problem with brush vibration.
  • a brush sliding on slip rings is naturally able to withstand a much higher current than a commutator brush, since it is under mechanically and electrically more favorable conditions. Since it does not have to run over lamella bars, it can also be subjected to a higher contact pressure than a brush sliding on a commutator.
  • the object of the invention is therefore to design an arrangement which ensures that the brush wear does not exceed the regular abrasion rate when falling below or with rapidly changing load cases.
  • the rotor winding is fed via a circular current transformer, the secondary winding strands of which each have a symmetrical center tap, which are conductively connected to a terminating component of the rotor circuit, and that an evenly divided brush holder is assigned to each slip ring, and that the winding start and winding end one secondary winding strand each with half the number of brush carrier parts of the respectively assigned Slip ring are conductively connected, and that the winding start and winding end of each primary winding strand of the circular current transformer are conductively connected to an alternating voltage source via on-off contacts of a switching device, and that the connection of the center tap of one of the two secondary winding strands to the terminating component of the rotor circuit is conducted via a current measuring device, which one Limit indicator via the actual rotor current and that the control circuit of the switching device is controlled by the limit indicator.
  • the figure shows a three-phase generator designed as a rotating ring machine (1), the rotor winding (2) of which is designed as an excitation winding and is connected to two slip rings (3, 4).
  • the rotor winding (2) is fed via a circular current transformer (5), the secondary winding strands (7a, 7b) of which each have a symmetrical center tap (8a, 8b), which are conductively connected to a terminating component (14) of the rotor circuit designed as a DC excitation source .
  • This end component (14) of the rotor circuit is fed via a three-phase transformer (15).
  • Each slip ring (3, 4) is assigned an evenly divided brush holder (3a and 3b and 4a and 4b);
  • the beginning and end of the winding of a secondary winding strand (7a, 7b) each have half the number of brush holder parts (4a or 4b and 3a or 3b) of the each assigned slip ring (4, 3) conductively connected.
  • the start and end of the winding of each primary winding strand (6a, 6b) of the circular current transformer (5) is conductively connected to an AC voltage source (16a, 16b) via on-off contacts (9a, 9b, 9c, 9d) of a switching device (9) designed as a contactor.
  • This current measuring device (13) informs a limit indicator (12) about the actual current strength of the rotor winding (2).
  • a control circuit (10a, 10b) of the switching device (9) can be controlled by the limit detector (12) by means of the control coil (10b).
  • the rotor current flows through the center taps (8a, 8b) of the circular current transformer (5) and then halves over the winding halves of the secondary winding strand (7a, 7b). If the limit value detector (12) registers that the rotor current falls below the lower limit value, i.e. if an excited operating state occurs, then by closing the control circuit (10a, 10b) it causes the control coil (10b) to pick up and via the on-off contacts (9a, 9b, 9c, 9d) the primary winding strand (6a, 6b) of the circular current transformer (5) is connected to the AC voltage source (16a, 16b).

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Motor Or Generator Current Collectors (AREA)

Abstract

Selon l'invention, l'enroulement rotorique (2) est alimenté dans le circuit rotorique par l'intermédiaire d'un transformateur de courant circulaire (5) et chacune de ses branches d'enroulement secondaire (7a, 7b) présente un point de prise médian (8a, 8b) symétrique. Les points de prise médians (8a, 8b) sont connectés de manière conductrice à un élément terminal (14) du circuit rotorique. La connexion du point de prise médian (8b) d'une des deux branches d'enroulement secondaire (7b) avec l'élément terminal (14) du circuit rotorique passe par un dispositif de mesure du courant (13) qui renseigne un indicateur de valeur limite (12) sur l'intensité réelle du courant du rotor. Lorsque le courant rotorique se trouve en dessous de la valeur limite inférieure, l'indicateur de valeur limite (12) commute les branches d'enroulement primaire (6a, 6b) du transformateur de courant circulaire (5) sur une source de tension alternative. Ce circuit permet d'augmenter le courant rotorique dans une plage de travail optimale par rapport à la densité de courant dans les balais.
EP95928389A 1994-08-31 1995-08-17 Circuit permettant d'eviter l'emergence de problemes au niveau des balais Withdrawn EP0778992A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
AT1668/94 1994-08-31
AT166894 1994-08-31
PCT/AT1995/000165 WO1996007232A1 (fr) 1994-08-31 1995-08-17 Circuit permettant d'eviter l'emergence de problemes au niveau des balais

Publications (1)

Publication Number Publication Date
EP0778992A1 true EP0778992A1 (fr) 1997-06-18

Family

ID=3518408

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95928389A Withdrawn EP0778992A1 (fr) 1994-08-31 1995-08-17 Circuit permettant d'eviter l'emergence de problemes au niveau des balais

Country Status (2)

Country Link
EP (1) EP0778992A1 (fr)
WO (1) WO1996007232A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110687446A (zh) * 2019-07-15 2020-01-14 浙江运达风电股份有限公司 一种双馈风力发电机电刷和滑环早期故障诊断方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2963178B1 (fr) * 2010-07-22 2012-07-27 Peugeot Citroen Automobiles Sa Procede et dispositif de surveillance de l'usure de contacts electriques frottants d'un collecteur de courant rotatif pour vehicule automobile

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE902041C (de) * 1940-06-01 1954-01-18 Siemens Ag Einphasenkommutatormaschine mit zwei Kommutatoren
GB889971A (en) * 1957-06-20 1962-02-21 English Electric Co Ltd Improvements in and relating to dynamo-electric machines
DE2146064A1 (de) * 1971-09-10 1973-03-15 Siemens Ag Anordnung zur vermeidung des ratterns und riefens von schleifringbuersten fuer gleichstrom, die zeitweise ohne betriebsstrom betrieben werden
DE2811302C2 (de) * 1978-03-15 1984-11-15 Jurij Petrovič Kuznecov Einrichtung zur Regelung der Drehzahl eines mehrphasigen Asynchron-Schleifringläufermotors

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9607232A1 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110687446A (zh) * 2019-07-15 2020-01-14 浙江运达风电股份有限公司 一种双馈风力发电机电刷和滑环早期故障诊断方法
CN110687446B (zh) * 2019-07-15 2022-02-08 浙江运达风电股份有限公司 一种双馈风力发电机电刷和滑环早期故障诊断方法

Also Published As

Publication number Publication date
WO1996007232A1 (fr) 1996-03-07

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