DE387396C - Device to prevent reverse current from rectifier-fed electric motors for hoists - Google Patents

Device to prevent reverse current from rectifier-fed electric motors for hoists

Info

Publication number
DE387396C
DE387396C DES60781D DES0060781D DE387396C DE 387396 C DE387396 C DE 387396C DE S60781 D DES60781 D DE S60781D DE S0060781 D DES0060781 D DE S0060781D DE 387396 C DE387396 C DE 387396C
Authority
DE
Germany
Prior art keywords
rectifier
hoists
reverse current
electric motors
prevent reverse
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.)
Expired
Application number
DES60781D
Other languages
German (de)
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 Schuckertwerke AG
Original Assignee
Siemens Schuckertwerke 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
Application filed by Siemens Schuckertwerke AG filed Critical Siemens Schuckertwerke AG
Priority to DES60781D priority Critical patent/DE387396C/en
Application granted granted Critical
Publication of DE387396C publication Critical patent/DE387396C/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C15/00—Safety gear
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C2700/00—Cranes
    • B66C2700/08—Electrical assemblies or electrical control devices for cranes, winches, capstans or electrical hoists
    • B66C2700/084—Protection measures

Description

Zum Senken von Lasten mittels Gleichstrommotoren macht man vielfach von einer Schaltung Gebrauch, bei welcher die: Hauptstromwicklung über Vorschaltwiderstände am $etz liegt und der Anker parallel zur Feldwicklung und einem Teil des Vorsdhaltwiderstandes geschaltet ist. Wenn Gleichstromhebezeuge in dieser Schaltung mittels Gleichrichters aus Drehstromnetzen gespeist werden, so muß, umA circuit is often used to lower loads using DC motors Use in which: the main current winding is connected to the mains via series resistors and the armature is connected in parallel to the field winding and part of the holding resistor is. If DC hoists in this circuit use rectifier off Three-phase networks are fed, so must to

ίο ein Erlöschen des Gleichrichters zu verhüten, dafür gesorgt werden, daß aus dem Motor kein Rückstrom zum Gleichrichter fließen kann. Eine Spannungserhöhung ist auch dann nicht erwünscht, wenn beispielsweise Glühlampen durch sie gefährdet werden. Um eine unzulässige Spannungserhöhung im Netz zu vermeiden, wird nach der Erfindung eine von der Spannung des Ankers abhängige Vorrichtung (Spannungsschütz, Zentrifugalkontakt, Spannüngsdynamo) dazu, verwendet, beim Anwachsen der Ankerspannung über die Gleichrichterspannung den Motor vom- Netz abzuschalten.ίο to prevent the rectifier going out, it must be ensured that no reverse current can flow from the motor to the rectifier. An increase in voltage is also not desirable if, for example, incandescent lamps be endangered by them. To avoid an impermissible increase in voltage in the network, According to the invention, a device dependent on the tension of the armature (voltage contactor, centrifugal contact, tension dynamo) used when the armature voltage increases above the rectifier voltage switch off the motor from the mains.

In der Zeichnung ist ein Ausführungsbeispiel dargestellt. Der Gleichrichter α wird von der in Stern geschalteten Sekundärwicklung des Transformators b gespeist. Der Sternpunkt der Sekundärwicklung ist mit dem Pol c des Gleichstromnetzes verbunden. Der Motor e mit den Regelwiderständen / und- dem Feld g liegt an dem Netz c, d. Der Schalter h des Motors steht unter der Wirkung eines Spannungsschützes i. Steigt die Ankerspannung über das zulässige Maß hinaus, so wird der Schalter geöffnet und dadurch der Motor vom Netz abgeschaltet.An exemplary embodiment is shown in the drawing. The rectifier α is fed by the star-connected secondary winding of the transformer b. The star point of the secondary winding is connected to pole c of the direct current network. The motor e with the variable resistors / and the field g is connected to the network c, d. The switch h of the motor is under the action of a voltage contactor i. If the armature voltage rises above the permissible level, the switch is opened and the motor is disconnected from the mains.

Um die Einrichtung gegen Spannungs-To protect the device against voltage

Schwankungen im Netz praktisdh unempfindlich zu machen, kann das Schütz i außer der Nebenschlußwjcklung noch eine Hauptstromwicklung mit sehr geringer Windungszahl erhalten. Diese ist so anzuschließen, daß bei positivem Drehmoment des Motors die Differenz der Amperewindungen der beiden Spulen und bei negativem Drehmoment die Summe der Amperewindungen beider Spulen wirkt.To make fluctuations in the network practically insensitive, the contactor i can have a main current winding with a very small number of turns in addition to the shunt winding. This is to be connected in such a way that with a positive torque of the motor the difference between the ampere turns of the two coils and with a negative torque the sum of the ampere turns of both coils acts.

Claims (1)

Patent-Anspruch:Patent claim: Einrichtung zur Verhütung des Rückstroms bei aus Gleichrichtern gespeisten Elektromotoren für Hebezeuge, dadurch gekennzeichnet, daß durch eine in Abhängigkeit von der Ankerspannung wirkende Vorrichtung der Motor vom Gleichrichter abgeschaltet wird, wenn seine Spannung höher ist als die Gleichrichterspannung.Device to prevent reverse current in the case of rectifiers fed Electric motors for hoists, characterized in that they are dependent on Acting from the armature voltage device, the motor is switched off by the rectifier when its voltage higher than the rectifier voltage.
DES60781D 1922-09-05 1922-09-05 Device to prevent reverse current from rectifier-fed electric motors for hoists Expired DE387396C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DES60781D DE387396C (en) 1922-09-05 1922-09-05 Device to prevent reverse current from rectifier-fed electric motors for hoists

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DES60781D DE387396C (en) 1922-09-05 1922-09-05 Device to prevent reverse current from rectifier-fed electric motors for hoists

Publications (1)

Publication Number Publication Date
DE387396C true DE387396C (en) 1924-01-03

Family

ID=7494367

Family Applications (1)

Application Number Title Priority Date Filing Date
DES60781D Expired DE387396C (en) 1922-09-05 1922-09-05 Device to prevent reverse current from rectifier-fed electric motors for hoists

Country Status (1)

Country Link
DE (1) DE387396C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050077371A1 (en) * 2003-10-14 2005-04-14 Greenberg Surgical Technologies, Llc Drinking straw holder for a bottle

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050077371A1 (en) * 2003-10-14 2005-04-14 Greenberg Surgical Technologies, Llc Drinking straw holder for a bottle

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