DE678411C - Method for braking asynchronous machines - Google Patents
Method for braking asynchronous machinesInfo
- Publication number
- DE678411C DE678411C DEA78582D DEA0078582D DE678411C DE 678411 C DE678411 C DE 678411C DE A78582 D DEA78582 D DE A78582D DE A0078582 D DEA0078582 D DE A0078582D DE 678411 C DE678411 C DE 678411C
- Authority
- DE
- Germany
- Prior art keywords
- braking
- winding
- asynchronous machines
- synchronous
- braking asynchronous
- 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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P3/00—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters
- H02P3/06—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter
- H02P3/18—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter for stopping or slowing an ac motor
- H02P3/20—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter for stopping or slowing an ac motor by reversal of phase sequence of connections to the motor
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Stopping Of Electric Motors (AREA)
Description
Verfahren zum Bremsen von Asynchronmaschinen Zur Bremsung von Asynchronmotoren, insbesondere für Hebezeuge, hat man neben der Gegenstrombremsung beim Senken kleiner Lasten eine übersynchrone Bremsung angewandt, da kleine Lasten bei der Gegenstrombremsung nicht durchziehen würden. Der Haken würde vielmehr in der Heberichtung bewegt.Method for braking asynchronous machines For braking asynchronous motors, especially for hoists, in addition to counter-current braking when lowering, one has smaller Over-synchronous braking is applied to loads, since counter-current braking is a small load would not go through. Rather, the hook would move in the lifting direction.
Um noch .eine oder mehrere Zwischenstufen für mittlere Lasten zu .erhalten, soll gemäß der Erfindung neben der an sich bekannten Gegenstrom- und (oder) übersynchronen Bremsung eine untersynchrone Bremsung dadurch ermöglicht werden, daß unter Aufrechterhaltung der dreiphasigen Speisung während des Umschaltvorganges eine Wicklungsphase aus dem Wicklungsverband gelöst und zu :einer der beiden anderen Wicklungsphasen, die unmittelbar ,am Netz angeschlossen bleiben, parallel geschaltet wird. Es ist zwar eine Senkschaltung bekannt, die sowohl im motorischen als auch im generatorischen Bereich eine untersynchrone Regelcharakteristik aufweist, bei der zwei Wicklungsphasen parallel zwischen zwei Netzleitern liegen. Hierbei verlaufen jedoch die Regelkurven nicht durch den Nullpunkt, was insofern nachteilig ist, als dem Motor auch im Stillstand ein Moment im selben Sinne erteilt wird, wodurch nach Erreichen der Drehzahl Null ein Wiederhochlaufen des Motors, bei Hebezeugen ein Anheben der Last stattfindet, sofern das Steuergerät in der untersynchronen Bremsstellung belassen wird.In order to have one or more intermediate stages for medium loads, is intended according to the invention in addition to the countercurrent and (or) oversynchronous, which are known per se Braking a sub-synchronous braking can be made possible that while maintaining the three-phase supply off a winding phase during the switchover process the winding bond released and to: one of the two other winding phases that immediately, remain connected to the mains, connected in parallel. It is true a lowering circuit known, both in the motor and in the generator Range has a subsynchronous control characteristic in which two winding phases lie in parallel between two mains conductors. Here, however, the control curves run not through the zero point, which is disadvantageous insofar as the motor is also at a standstill a torque is given in the same sense, whereby zero after reaching the speed the motor starts up again, the load is lifted in the case of hoists, provided that the control unit is left in the subsynchronous braking position.
An sich ist es ,auch bekannt, neben der übersynchronen Bremsung untersynchron zu bremsen und während des Umschaltvorganges die dreiphasige Speisung aufrechtzuerhalten. Da bei der bekannten Schaltung jedoch eine Phasenumkehr von i 8o" stattfindet, entsteht im Stillstand ein Moment, das ein Wiederhochlaufen des Motors verursacht.In itself it is, also known, undersynchronous in addition to the oversynchronous braking to brake and to maintain the three-phase supply during the switchover process. However, since in the known circuit there is a phase reversal of i 8o " a moment at standstill that causes the motor to restart.
In der Zeichnung ist ein Ausführungsbeispiel für eine Umschaltung von übersynchr oner Bremsung (Abb. i) auf untersynchrone mit dreiphasiger Speisung (Abb.2) und auf Gegenstrombremsung (Abb.3) dargestellt. Wie zu ersehen ist, paßt sich die untersynchrone Bremsung nach Abb.2 sehr harmonisch als Zwischenstufe zwischen die Schaltung für normalen Motorbetrieb bzw. übersynchrone Bremsung und die Gegenstrombremsung. Es braucht niemals der volle Netzstrom geschaltet zu werden, und es ergeben sich keine Freifallstellungen.The drawing shows an exemplary embodiment for a switchover from oversynchronous braking (Fig. i) to undersynchronous braking with three-phase supply (Fig.2) and on counter-current braking (Fig.3). As can be seen, it fits the sub-synchronous braking according to Fig. 2 is very harmonious as an intermediate stage between the circuit for normal motor operation or over-synchronous braking and counter-current braking. The full line current never needs to be switched, and it happens no free fall positions.
Zur Einstellung der Bremswirkung kann man noch auf jeder Stufe den Rotorwiderstand verändern. Man kann aber auch die Erfindung bei Motoren mit festem Ankerwiderstand verwenden, ,also bei Käfigankermotoren.To adjust the braking effect, you can still use the Change rotor resistance. But you can also use the invention in engines with fixed Use armature resistance, i.e. with squirrel cage armature motors.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEA78582D DE678411C (en) | 1936-02-21 | 1936-02-21 | Method for braking asynchronous machines |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEA78582D DE678411C (en) | 1936-02-21 | 1936-02-21 | Method for braking asynchronous machines |
Publications (1)
Publication Number | Publication Date |
---|---|
DE678411C true DE678411C (en) | 1939-07-27 |
Family
ID=6947457
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEA78582D Expired DE678411C (en) | 1936-02-21 | 1936-02-21 | Method for braking asynchronous machines |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE678411C (en) |
-
1936
- 1936-02-21 DE DEA78582D patent/DE678411C/en not_active Expired
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