DE2607067A1 - Speed controlled DC motor protection circuit - has diode switching in ballast resistor when motor acts as generator - Google Patents

Speed controlled DC motor protection circuit - has diode switching in ballast resistor when motor acts as generator

Info

Publication number
DE2607067A1
DE2607067A1 DE19762607067 DE2607067A DE2607067A1 DE 2607067 A1 DE2607067 A1 DE 2607067A1 DE 19762607067 DE19762607067 DE 19762607067 DE 2607067 A DE2607067 A DE 2607067A DE 2607067 A1 DE2607067 A1 DE 2607067A1
Authority
DE
Germany
Prior art keywords
motor
generator
ballast resistor
protection circuit
diode
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Withdrawn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
DE19762607067
Other languages
German (de)
Inventor
Manfred Gronstedt
Hans Kostmann
Volkmar Dipl Ing Thun
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.)
PURFUERST KG ING BUERO
Original Assignee
PURFUERST KG ING BUERO
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 PURFUERST KG ING BUERO filed Critical PURFUERST KG ING BUERO
Priority to DE19762607067 priority Critical patent/DE2607067A1/en
Publication of DE2607067A1 publication Critical patent/DE2607067A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
    • H02H7/0833—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors for electric motors with control arrangements
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
    • H02H7/0811—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors for dc motors

Landscapes

  • Protection Of Generators And Motors (AREA)

Abstract

The protection circuit, for a speed-controlled dc motor supplied via a thyristor rectifier with energy return, has a diode (2) connected between the motor (3) and the rectifier (1) and forward biased when the motor is acting as a motor. The ballast resistor (4) used when the motor is working as a generator is therefore only effective when the motor is actually generating current. The rectifier consists of two antiparallel thyristors and is coupled to the ac supply. The ballast resistor, shunted by the diode, protects the generator from short circuit currents.

Description

Schutzschaltung für drehzahlgeregelte Protection circuit for speed-controlled

Gleichstromantriebe Die Erfindung betrifft eine Schutzschaltung für drehzahlgeregelte Gleichstromantriebe mit einer Gleichstromeinspeisung über eine Thyristorengleichrichterschaltung mit Energierückspeisung. DC drives The invention relates to a protective circuit for Speed-controlled DC drives with a DC supply via a Thyristor rectifier circuit with energy recovery.

Bei einem Regeleingriff aufgrund zu hoher Drehzahl eines Gleichstrommotors wird der Gleichstrommotor als Generator betrieben. Pällt in diesem Zustand das Versorgungsnetz aus und liegt damit ein Netzkurzschluß vor, wird der Motor- und Thyristorstrom unzulässig hoch. Um eine Gefährdung der Anlage zu verhindern, ist es bekannt, den Gleichstrommotor von der Versorgungsleitung abzuschalten. Derartige Schalter und auch Sicherungen können dies aber nicht immer rechtzeitig bewirken.In the event of a control intervention due to excessive speed of a DC motor the DC motor is operated as a generator. In this state, the supply network falls and if there is a mains short-circuit, the motor and thyristor currents are impermissible high. In order to prevent the system from being endangered, it is known to use the direct current motor disconnect from the supply line. Such switches and also fuses but cannot always do this in time.

Der Erfindung liegt die Aufgabe zugrunde, den Gleichstrommotor und die thyristorbestückte Gleichstromeinspeisung im Generatorbetrieb vor Kurzschlußströmen zu schützen.The invention is based on the object, the DC motor and the thyristor-equipped direct current feed in generator operation against short-circuit currents to protect.

Die Aufgabe wird erfindungsgemäß dadurch gelöst, daß zwischen Gleichrichterschaltung und Gleichstrommotor eine Diode in Durchlaßrichtung für Motorbetrieb geschaltet ist, der ein nur bei Generatorbetrieb des Gleichstrommotors wirksam werdender Vorwiderstand parallel geschaltet ist.The object is achieved according to the invention in that between the rectifier circuit and DC motor connected a diode in the forward direction for motor operation is the one only Effective when the DC motor is operating as a generator the series resistor is connected in parallel.

Von dem parallelen Vorwiderstand wird im Falle eines Netzausfalles der Thyristor- und Motorstrom sofort begrenzt. Die Erfindung ermöglicht einen sofortigen Schutz der Anlage bei Netzausfall im Generatorbetrieb des Gleichstrommotors.The parallel series resistor is used in the event of a power failure the thyristor and motor current are immediately limited. The invention allows for an instant Protection of the system in the event of a power failure when the DC motor is in generator mode.

Anhand der Zeichnung wird ein Ausführungsbeispiel der Erfindung nachstehend näher erläutert.An exemplary embodiment of the invention is described below with reference to the drawing explained in more detail.

Die von dem Versorgungsnetz anstehende Wechselspannung wird von den Thyristoren 1 gleichgerichtet und steht danach über die in Durchlaßrichtung geschaltete Diode 2 am Gleichstrommotor 3 an. Die Diode 2 ist durch einen parallelgeschalteten Vorwiderstand 4- überbrückt. Zwischen dem Diodenzweig 2 und den antiparallelgeschalteten Thyristoren 1 liegt eine Schmelzsicherung 5.The alternating voltage from the supply network is used by the Thyristors 1 rectified and is then over the switched in the forward direction Diode 2 on DC motor 3. The diode 2 is connected in parallel by a Series resistor 4- bridged. Between the diode branch 2 and the anti-parallel connected Thyristors 1 have a fuse 5.

Der besseren Übersicht halber wird nur eine antiparallele ThyristorschaltunFr 1 gezeigt. Es ist üblich, für åede Phase zwei antiparallele Thyristorenschaltungen vorzusehen.For the sake of clarity, only an anti-parallel thyristor circuit is used 1 shown. It is common to have two anti-parallel thyristor circuits for each phase to be provided.

Die Dretzahlregeleinrichtungw für den Gleichstrommotor 3 mit Energierückspeisung ist- an sich bekannt und braucht hier nicht näher erläutert zu werden.The Dretzahlregeleinrichtungw for the DC motor 3 with energy recovery is known per se and does not need to be explained in more detail here.

Ist die Drehzahl des Gleichstrommotors 3 zu hoch, arbeitet der Gleichstrommotor 3 aufgrund eines entsprechenden Regeleingriffs im Generatorbetrieb. Fällt das Versorgungsnetz in diesem Zustand aus, ist die Diode 2 in Sperrichtung. Der vom im Generatorbetrieb arbeitenden Geichstrommotor 3 gelieferte Strom wird durch den parallel zur Diode 2 liegenden Vorwiderstand 4 begrenzt. Die Kurzschlußspannung fällt an dem Vorwiderstand 4 ab. Die Thyristorenschaltung 1 und der Gleichstrommotor 3 werden vor Überlastung geschützt.If the speed of the DC motor 3 is too high, the DC motor works 3 due to a corresponding control intervention in generator mode. The supply network falls off in this state, the diode 2 is in the reverse direction. The one in generator mode working DC motor 3 is supplied by the parallel to the diode 2 lying series resistor 4 limited. The short-circuit voltage drops across the series resistor 4 from. The thyristor circuit 1 and the DC motor 3 are protected from overload protected.

L e e r s e i t eL e r s e i t e

Claims (1)

S C H U T Z A N S P R U C H Schutzschaltung für drehzahlgeregelte Gleichstromantriebe mit einer Gleichstromeinspeisung über eine Thyristorengleichrichterschaltung mit Energrierückspeisung, dadurch gekennzeichnet, daß zwischen Gleichrichterschaltung (1) und Gleichstrommotor (3) eine Diode (2) in Durchlaßrichtung fr Motorbetrieb geschaltet ist, der ein nur bei Generatorbetrieb des Gleichstrommotors (3) wirksam werdender Vorwiderstand (4) parallel geschaltet ist. S C H U T Z A N S P R U C H Protection circuit for speed-controlled DC drives with a DC supply via a thyristor rectifier circuit with energy recovery, characterized in that between the rectifier circuit (1) and DC motor (3) a diode (2) in the forward direction for motor operation is switched, which is only effective when the DC motor (3) is in generator mode the series resistor (4) is connected in parallel.
DE19762607067 1976-02-21 1976-02-21 Speed controlled DC motor protection circuit - has diode switching in ballast resistor when motor acts as generator Withdrawn DE2607067A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19762607067 DE2607067A1 (en) 1976-02-21 1976-02-21 Speed controlled DC motor protection circuit - has diode switching in ballast resistor when motor acts as generator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19762607067 DE2607067A1 (en) 1976-02-21 1976-02-21 Speed controlled DC motor protection circuit - has diode switching in ballast resistor when motor acts as generator

Publications (1)

Publication Number Publication Date
DE2607067A1 true DE2607067A1 (en) 1977-08-25

Family

ID=5970518

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19762607067 Withdrawn DE2607067A1 (en) 1976-02-21 1976-02-21 Speed controlled DC motor protection circuit - has diode switching in ballast resistor when motor acts as generator

Country Status (1)

Country Link
DE (1) DE2607067A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2561046A1 (en) * 1984-03-10 1985-09-13 Inter Control Koehler Hermann CIRCUIT BREAKER DEVICE FOR THYRISTORS CONTROLLED CURRENT ALTERNATING CURRENT MOTORS
FR2616599A1 (en) * 1987-06-09 1988-12-16 Neiman Sa Supply circuit with safety stop for electric motors

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2561046A1 (en) * 1984-03-10 1985-09-13 Inter Control Koehler Hermann CIRCUIT BREAKER DEVICE FOR THYRISTORS CONTROLLED CURRENT ALTERNATING CURRENT MOTORS
FR2616599A1 (en) * 1987-06-09 1988-12-16 Neiman Sa Supply circuit with safety stop for electric motors

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Legal Events

Date Code Title Description
OGA New person/name/address of the applicant
8139 Disposal/non-payment of the annual fee