DE431273C - Lowering circuit for three-phase asynchronous motors - Google Patents
Lowering circuit for three-phase asynchronous motorsInfo
- Publication number
- DE431273C DE431273C DEF57374D DEF0057374D DE431273C DE 431273 C DE431273 C DE 431273C DE F57374 D DEF57374 D DE F57374D DE F0057374 D DEF0057374 D DE F0057374D DE 431273 C DE431273 C DE 431273C
- Authority
- DE
- Germany
- Prior art keywords
- switched
- lowering
- phase
- windings
- motor
- 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
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C13/00—Other constructional features or details
- B66C13/18—Control systems or devices
- B66C13/22—Control systems or devices for electric drives
- B66C13/23—Circuits for controlling the lowering of the load
- B66C13/26—Circuits for controlling the lowering of the load by ac motors
-
- 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
- B66C2700/081—Electrical assemblies or electrical control devices for cranes, winches, capstans or electrical hoists with ac motors
Landscapes
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Mechanical Engineering (AREA)
- Motor And Converter Starters (AREA)
- Control Of Ac Motors In General (AREA)
- Stopping Of Electric Motors (AREA)
Description
DEUTSCHES REICHGERMAN EMPIRE
AUSGEGEBEN AM 5.JULI1926 ISSUED JULY 5, 1926
REICHSPATENTAMTREICH PATENT OFFICE
PATENTSCHRIFTPATENT LETTERING
-JV* 431273 -KLASSE 35b GRUPPE^· - JV * 431273 - CLASS 35b GROUP ^ ·
(F 57374 XIl35b)(F 57374 XIl35b)
Herbert Franken in Köln.Herbert Franken in Cologne.
Senkschaltung für Drehstrom-Asynchronmotoren.Lowering circuit for three-phase asynchronous motors.
Die einfachste bekannte Senkschaltung für Drehstrom-Asynchronmotoren, die sogenannte »verkürzte Senkschaltung«, hat den Nachteil, daß die Anzugsströme und Drehmomente zu hoch werden, wenn man den Widerstand so abgleicht, daß bei hohen Lasten die synchrone Drehzahl nicht viel überschritten wird. Ferner ist es außerordentlich schwierig, mit den bekannten Schaltungen bei geringen Lasten Drehzahlen zu erhalten, die von derThe simplest known lowering circuit for three-phase asynchronous motors, the so-called "Shortened lowering circuit" has the disadvantage that the starting currents and torques become too high if the resistance is adjusted in such a way that the synchronous Speed is not exceeded much. It is also extremely difficult to work with the known circuits at low loads to obtain speeds that are determined by the
synchronen Drehzahl nennenswert abweichen. Soweit diese Forderungen erfüllt werden, geschieht es mit erheblichem Materialaufwand. Dem Erfindungsgedanken liegen zwei Ge-Sichtspunkte zugrunde. Beim Absenken ,ist es im Hinblick auf die erforderlichen geringeren Kräfte zulässig, das Feld des Motors zu schwächen. Ferner muß man, um eine Drehzahlverminderung auch bei geringen ίο Lasten zu erzielen, künstlich einen Läuferverlust herbeiführen. Dies geschieht in der Weise, daß man einen Teil der Ständer wicklungen beim Absenken nicht miteinschaltet und die in den abgeschalteten Wicklungen induzierte Spannung sich über Widerstände auswirken läßt. Die Energiezufuhr nach diesen Wicklungen geschieht unter Vermittlung des Läufers, so daß hierin ein Wärmeverlust und dementsprechend ein Schlupf entsteht. Wenn die Motoren betriebsmäßig in Dreieckschaltung arbeiten, und man schaltet eine Phasenwicklung ab, so gewährleisten die eingeschaltet bleibenden Wicklungen immer noch ein genügend großes Anzugsdrehmoment. Eine der drei Ständerwicklungen kann infolgedessen ohne weiteres für die Bremswirkung verwandt werden. Arbeitet der Motor» dagegen betriebsmäßig in Sternschaltung, so ist es erforderlich, die Ströme in den beiden eingeschaltet bleibenden Wicklungen in der Phase gegeneinander zu verschieben. Dies geschieht zweckmäßig durch Einschalten eines Widerstandes zwischen den Sternpunkt und die abgeschaltete Netzleitung. Auf den letzten Stellungen des Steuerzeugs kann von der einphasigen Motorschaltung wiederum auf die dreiphasige übergegangen werden.synchronous speed deviate significantly. As far as these requirements are met, happens it with considerable material expenditure. The idea of the invention is based on two Ge viewpoints underlying. When lowering, it is required in terms of lower Forces allowed to weaken the field of the motor. Furthermore, to get a To achieve a reduction in speed even with low loads, artificially a rotor loss bring about. This is done in such a way that one part of the stand windings does not switch on when lowering and the voltage induced in the switched-off windings is spread across resistors can affect. The energy supply to these windings takes place under mediation of the rotor, so that there is a loss of heat and, accordingly, a slip. When the motors are working in delta connection and you switch one Phase winding off, so the windings that remain switched on still guarantee a sufficiently large tightening torque. As a result, one of the three stator windings can easily be used for the braking effect. If, on the other hand, the motor works in star connection, so it is necessary to control the currents in the two windings that remain switched on in the Move phase against each other. This is expediently done by switching on a resistor between the star point and the disconnected power line. In the last positions of the control unit, from the single-phase motor circuit can in turn be changed over to the three-phase one.
Die Abb. 1 zeigt eine Anordnung für betriebsmäßig in Dreieckschaltung laufende Motoren. Hierbei ist die Wicklung 3 vom Netz abgetrennt und über den Widerstand 4 kurzgeschlossen. Fig. 1 shows an arrangement for motors operating in a delta connection. In this case, the winding 3 is separated from the network and short-circuited via the resistor 4.
Abb. 2 zeigt eine Anordnung für betriebsmäßig in Sternschaltung laufende Motoren. Hierbei ist die Wicklung 7 vom Netz abgetrennt und über den Widerstand 8 geschlossen. Zur Erzielung eines Anzugsdrehmomentes ist ferner der Nullpunkt 9 mit der abgeschalteten Netzphase über den Widerstand 10 verbunden. Fig. 2 shows an arrangement for star-connected motors. In this case, the winding 7 is separated from the network and closed via the resistor 8. To achieve a tightening torque, the zero point 9 is also switched off Mains phase connected via resistor 10.
Durch diese Anordnungen entstehen Regelkurven etwa nach Abb. 3.These arrangements result in control curves as shown in Fig. 3.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEF57374D DE431273C (en) | 1924-11-21 | 1924-11-21 | Lowering circuit for three-phase asynchronous motors |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEF57374D DE431273C (en) | 1924-11-21 | 1924-11-21 | Lowering circuit for three-phase asynchronous motors |
Publications (1)
Publication Number | Publication Date |
---|---|
DE431273C true DE431273C (en) | 1926-07-05 |
Family
ID=7108251
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEF57374D Expired DE431273C (en) | 1924-11-21 | 1924-11-21 | Lowering circuit for three-phase asynchronous motors |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE431273C (en) |
-
1924
- 1924-11-21 DE DEF57374D patent/DE431273C/en not_active Expired
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