DE422612C - Lowering circuit for hoists operated with direct current series motors - Google Patents

Lowering circuit for hoists operated with direct current series motors

Info

Publication number
DE422612C
DE422612C DEA42076D DEA0042076D DE422612C DE 422612 C DE422612 C DE 422612C DE A42076 D DEA42076 D DE A42076D DE A0042076 D DEA0042076 D DE A0042076D DE 422612 C DE422612 C DE 422612C
Authority
DE
Germany
Prior art keywords
field
armature
direct current
lowering circuit
lowering
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
DEA42076D
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.)
BBC Brown Boveri France SA
Original Assignee
BBC Brown Boveri France SA
Publication date
Priority to DEA42076D priority Critical patent/DE422612C/en
Application granted granted Critical
Publication of DE422612C publication Critical patent/DE422612C/en
Expired legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B66HOISTING; LIFTING; HAULING
    • B66CCRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C13/00Other constructional features or details
    • B66C13/18Control systems or devices
    • B66C13/22Control systems or devices for electric drives
    • B66C13/23Circuits for controlling the lowering of the load
    • B66C13/24Circuits for controlling the lowering of the load by dc motors

Landscapes

  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Direct Current Motors (AREA)

Description

Beim Senkbetrieb von Krananlagen mit Gleichstrom-Hauptstrommotoren ist es erwünscht, daß der Motor mit Senkkraftcharakteristik, d. h. mit einem Drehmoment im Senksinne anläuft und dann mit steigender Geschwindigkeit als Bremse wirkt, wobei er Senkbremscharakteristik besitzt. Außerdem soll sowohl das Senken der Vollast als auch das Senken des leeren Hakens auf ein undWhen lowering crane systems with direct current main current motors, it is desirable that the motor with lowering force characteristic, d. H. starts with a torque in the lowering sense and then with increasing Speed acts as a brake, whereby it has lowering braking characteristics. aside from that should both lower the full load and lower the empty hook on and

ίο derselben Kontrollerstellung möglichst mit der gleichen Geschwindigkeit erfolgen. Es sind verschiedene Schaltarten ausgebildet worden, von denen einige diese Bedingungen jedoch nur teilweise erfüllen, andere komplizierte Schaltungen erfordern oder hohen Stromverbrauch bedingen.ίο the same control creation as possible with the same speed. Different types of switching have been designed, some of which only partially meet these conditions, others more complicated Require circuits or cause high power consumption.

Die neue Schaltung zeichnet sich durch große Einfachheit und geringen Stromverbrauch aus. Dies wird dadurch erreicht, daß sowohl die Feldwicklung als auch der Anker in an sich bekannter Weise an einen als Spannungsteiler zu betrachtenden Widerstand angeschlossen sind, so daß die Stromaufnahme im Stillstand durch den vor dem Motor liegenden Widerstand begrenzt wird. Durch Verschieben des Ankeranschlusses über den zum Feld parallel liegenden Widerstandsteil hinaus wird ermöglicht, von der reihenschlußartigen Schaltung ohne Umschaltung des Ankers und ohne Sprung ganz allmählich in eine nebenschlußartige Schaltung überzugehen, wobei in den übergreifenden Stellungen erreicht wird, daß die Felderregung allmählich immer weniger vom Ankerstrom beeiniiußt wird. Beide Schaltungen haben Kompoundcharakter, indem die Feldwicklung durchweg sowohl von der Netzspannung beeinflußt als auch von einem Teil des Ankerstromes durchflossen wird.The new circuit is characterized by great simplicity and low power consumption the end. This is achieved in that both the field winding and the armature are connected to a voltage divider in a manner known per se to be considered resistor are connected, so that the current consumption at standstill by the lying in front of the motor Resistance is limited. By moving the armature connection beyond the resistor part that is parallel to the field is made possible from the series connection without switching the armature and without jumping very gradually into a shunt-like circuit to pass over, in the overarching positions what is achieved is that the field excitation is gradually less and less influenced by the armature current will. Both circuits have a compound character in that the field winding is consistently influenced by the mains voltage and part of the armature current flows through it.

In der Zeichnung, in der α den Anker, b die Feldwicklung des Motors und c den Spannungsteilerwiderstand bedeutet, ist die reihenschlußartige Schaltung (I) gestrichelt eingetragen, während die Stellung des beweglichen Kontaktes für das Senkbremsen bei nebenschlußartiger Schaltung (II) mit ausgezogener Linie dargestellt ist. Zum Regeln der Lastgeschwindigkeit und zur Erzielung der gewünschten Drehzahl-Drehmoment-Kurven beim Senken können alle Widerstandsteile veränderlieh gemacht werden. Auch können in die einzelnen Stromzweige noch besondere feste oder regelbare Widerstände eingefügt werden, was beim Senkbremsen vor allem für den Feldstromkreis zweckmäßig ist.In the drawing, in which α denotes the armature, b denotes the field winding of the motor and c denotes the voltage divider resistance, the series connection (I) is shown with a broken line, while the position of the movable contact for lowering braking with a shunt type connection (II) is shown with a solid line is. To regulate the load speed and to achieve the desired speed-torque curves when lowering, all resistance parts can be made variable. Special fixed or controllable resistors can also be inserted into the individual branches, which is particularly useful for the field circuit when lowering the brakes.

Claims (2)

Patent-Ansprüche:Patent Claims: 1. Senkschaltung für mit Gleichstrom-Reihenschlußmotoren betriebene Hebezeuge, bei der sowohl die Feldwicklung als auch der Anker des Motors an einen zwischen den Netzpolen liegenden Spannungsteilerwiderstand angeschlossen sind, dadurch gekennzeichnet, daß der Übergang von der reihenschlußartigen in die nebenschlußartige Schaltung dadurch erfolgt, daß ein an den einen Ankerpol angeschlossener GleitkQntakt allmählich von dem dem Feld vorgeschalteten auf den zum Feld parallel geschalteten Widerstandsteil verschoben wird.1. Lowering circuit for with direct current series motors operated hoists in which both the field winding and the armature of the motor are connected to one voltage divider resistor lying between the network poles are connected, characterized in that the transition from the series connection to the shunt connection takes place in that a connected to one armature pole Sliding contact gradually from the one in front of the field to the one in front of the field Field connected in parallel resistance part is shifted. 2. Senkschaltung nach Anspruch i, dadurch gekennzeichnet, daß in den Anker- oder in den Feldstromkreis oder in beide regelbare Zusatzwiderstände eingeführt sind.2. Lowering circuit according to claim i, characterized characterized in that introduced into the armature or in the field circuit or in both adjustable additional resistors are.
DEA42076D Lowering circuit for hoists operated with direct current series motors Expired DE422612C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEA42076D DE422612C (en) Lowering circuit for hoists operated with direct current series motors

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEA42076D DE422612C (en) Lowering circuit for hoists operated with direct current series motors

Publications (1)

Publication Number Publication Date
DE422612C true DE422612C (en) 1925-12-05

Family

ID=6932902

Family Applications (1)

Application Number Title Priority Date Filing Date
DEA42076D Expired DE422612C (en) Lowering circuit for hoists operated with direct current series motors

Country Status (1)

Country Link
DE (1) DE422612C (en)

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