AT74659B - Lowering brake circuit for electric motors. - Google Patents

Lowering brake circuit for electric motors.

Info

Publication number
AT74659B
AT74659B AT74659DA AT74659B AT 74659 B AT74659 B AT 74659B AT 74659D A AT74659D A AT 74659DA AT 74659 B AT74659 B AT 74659B
Authority
AT
Austria
Prior art keywords
brake circuit
electric motors
lowering brake
loads
lowering
Prior art date
Application number
Other languages
German (de)
Original Assignee
Aeg Union Elek Wien
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 Aeg Union Elek Wien filed Critical Aeg Union Elek Wien
Application granted granted Critical
Publication of AT74659B publication Critical patent/AT74659B/en

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  • Stopping Of Electric Motors (AREA)

Description

  

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   Mn Widerstand von verhältnismässig   hoher Ohmzahl parallel geschaltet und letztere bei schweren Lasten verringert wird, indem in diesem Falle ein Teil des Parallelwiderstandes durch das Schütz m in der aus der Fig. 4 ersichtlichen Weise kurzgeschlossen wird. 



   Gemäss Fig. 3 wird ein von der Ankerspannung abhängiger elektromagnetischer Hilfeschalter   b'benutzt.     Gemäss Fig.   4 ein Sperrapparat b nach Art der Fig. 2 bzw. der obengenannten Patentschrift. Diese beiden Schaltapparate können sich bei allen Anordnungen gegenseitig ersetzen. 



    PATENT. ANSPRÛCHE :  
1. Senkbremsschaltung für elektrische Motoren, dadurch gekennzeichnet, dass eine unzulässige Geschwindigkeitssteigerung beim Senken schwerer Lasten auf Kontrollerstellungen, welche für leichtere Lasten bestimmt sind, durch eine selbsttätige Schaltvorrichtung stossfrei verhindert wird, indem beim Eintritt einer Bewegung auf den Senkstellungen für schwerere Lasten durch diese Schaltvorrichtung vorbeugend eine die Geschwindigkeit vermindernde   Schaltungsänderung   (Umschaltung des Zwei- oder Dreiphasenankers in Einphasenschaltung bei Drehstrommotoren, Parallelschaltung von Widerstand zum Anker bei Hauptstrommotoren, Kurzschliessen eines 
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 leichtere Lasten vorbereitet wird.



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   Mn resistance of relatively high ohm number is connected in parallel and the latter is reduced in the case of heavy loads, in that in this case part of the parallel resistance is short-circuited by the contactor m in the manner shown in FIG.



   According to FIG. 3, an electromagnetic auxiliary switch b ′ that is dependent on the armature voltage is used. According to FIG. 4, a locking device b according to the type of FIG. 2 or the above-mentioned patent specification. These two switching devices can replace each other in all arrangements.



    PATENT. EXPECTATIONS :
1. Lowering brake circuit for electric motors, characterized in that an inadmissible increase in speed when lowering heavy loads on control positions, which are intended for lighter loads, is prevented smoothly by an automatic switching device, in that when a movement occurs on the lowering positions for heavier loads by this switching device preventive changes in the circuit that reduce the speed (switching the two- or three-phase armature to single-phase circuit for three-phase motors, parallel connection of the resistor to the armature for main-current motors, short-circuiting one
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 lighter loads are prepared.

 

Claims (1)

2. Drehstromsenkbremsschaltung nach Anspruch 1, dadurch gekennzeichnet, dass als selbsttätige Schaltvorrichtung ein von der Trommelwelle mittels Schleppwalze gesteuerter Schalter dient und dieser bei Lasten, welche sich auf der Kontrollergrenzstellung für schwere Lasten in Bewegung gesetzt haben, eine weitere Schwächung des Gegenmomentes auf der folgenden, vorzugsweise durch eine Hilfswalze herbeigeführten Kontrollerstellung wirkungslos macht. 2. Three-phase lowering brake circuit according to claim 1, characterized in that a switch controlled by the drum shaft by means of a drag roller is used as an automatic switching device and this, in the case of loads that have set themselves in motion on the control limit position for heavy loads, further weaken the counter-torque on the following, preferably made by an auxiliary roller brought about control creation ineffective.
AT74659D 1914-12-19 1915-12-20 Lowering brake circuit for electric motors. AT74659B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE74659X 1914-12-19

Publications (1)

Publication Number Publication Date
AT74659B true AT74659B (en) 1918-09-10

Family

ID=5636854

Family Applications (1)

Application Number Title Priority Date Filing Date
AT74659D AT74659B (en) 1914-12-19 1915-12-20 Lowering brake circuit for electric motors.

Country Status (1)

Country Link
AT (1) AT74659B (en)

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