DE701291C - Circuit to achieve an asynchronous saddle formation - Google Patents
Circuit to achieve an asynchronous saddle formationInfo
- Publication number
- DE701291C DE701291C DE1939L0097651 DEL0097651D DE701291C DE 701291 C DE701291 C DE 701291C DE 1939L0097651 DE1939L0097651 DE 1939L0097651 DE L0097651 D DEL0097651 D DE L0097651D DE 701291 C DE701291 C DE 701291C
- Authority
- DE
- Germany
- Prior art keywords
- asynchronous
- achieve
- circuit
- saddle
- saddle formation
- 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
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K17/00—Asynchronous induction motors; Asynchronous induction generators
- H02K17/02—Asynchronous induction motors
- H02K17/30—Structural association of asynchronous induction motors with auxiliary electric devices influencing the characteristics of the motor or controlling the motor, e.g. with impedances or switches
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Synchronous Machinery (AREA)
Description
Beim Betrieb von Drehstrommotoren ist es in vielen Fällen erwünscht, neben der Betriebsdrehzahl noch eine weitere kleinere Drehzahl zur Verfügung zu haben. Wenn man von einer Polumschaltung absieht, so scheinen synchrone oder asynchrone Sattelbildungen in der Drehmomentkennlinie zur Erzielung einer zweiten Drehzahl geeignet. Solche Sattelbildungen kann man bekanntlichWhen operating three-phase motors, it is often desirable in addition to the Operating speed to have a further lower speed available. if if one refrains from pole switching, synchronous or asynchronous saddle formations appear suitable in the torque characteristic to achieve a second speed. It is well known that such saddle formations are possible
to durch Auswahl ganz bestimmter Ständer- und Läufernutzahlen erhalten. Die außerdem verwendeten, bekannten Sonderschaltungen erfordern im allgemeinen entweder Wicklungsumschaltungen im Ständer und Läufer oder Umschaltungen im Ständer allein,· immer aber mehrere an ein Klemmbrett geführte Anzapfungen jeder Phasenwicklung der sonst normal geschalteten Wicklung sowie entsprechend ausgebildetes Schaltzeug.to by selecting very specific stand and Receive runner user numbers. The known special circuits also used require generally either winding changes in the stator and rotor or changes in the stator alone, but always several taps led to a terminal board of each phase winding of the otherwise normally switched winding and accordingly trained gear.
Beschränkt man sich darauf, 1Z3 der Synchrondrehzahl als Schleichdrehzahl zu verlangen, so kann das bei normal dreieck-, geschalteten Drehstrommotoren erfindungsgemäß dadurch erfolgen, daß ein Ende einer Phasenwicklung aus dem Wicklungsverband gelöst und mit einem der beiden anderen Eckpunkte des Dreieckverbandes verbunden wird.If you limit yourself to requesting 1 Z 3 of the synchronous speed as the creep speed, this can be done according to the invention for normally triangular, switched three-phase motors by detaching one end of a phase winding from the winding group and connecting it to one of the other two corner points of the triangular group.
Ausführungsbeispiele der Erfindung sind in der Zeichnung dargestellt. Unter Vernachlässigung der Sättigung und bei Beschränkung auf die Grundwelle kann das Drehmomentverhalten in einfachster Weise mit Hilfe der symmetrischen Komponenten ermittelt werden. Da die Phasenspannungen bei den Schaltungen nach Abb. 1 und 2 festgelegt sind, so sind natürlich die symmetrischen Komponenten unabhängig vom Schlupf, und das Auftreten einer Nullkomponente ruft bei 1Z3 der Synchrondrehzahl einen scharf ausgeprägten asynchronen Sattel hervor. Abb.3, in der die Kurvet den Drehmomentverlauf bei normaler Dreieckschaltung veranschaulicht, zeigt in Kurve B die asynchrone Sattelbildung, hervorgerufen bei 1J3 der Synchrondrehzahl bei einer Schaltung gemäß Abb. i.Embodiments of the invention are shown in the drawing. Neglecting saturation and restricting it to the fundamental wave, the torque behavior can be determined in the simplest way with the help of the symmetrical components. Since the phase voltages are fixed in the circuits according to Fig. 1 and 2, the symmetrical components are of course independent of the slip, and the occurrence of a zero component causes a sharply pronounced asynchronous saddle at 1 Z 3 of the synchronous speed. Fig. 3, in which the curve illustrates the torque curve with normal delta connection, shows in curve B the asynchronous saddle formation, caused at 1 J 3 of the synchronous speed in a circuit according to Fig. I.
Da beim Übergang vom Normalbetrieb auf die Schleichdrehzahl nur das Ende einer Phasenwicklung umgeschaltet werden muß, genügt es, vier Klemmen an eine Schaltleiste zu führen. Die Umschaltung kann dann beispielsweise durch Umlegen einer Verbindungslasche oder mittels eines einpoligen Umschalters erfolgen.Since during the transition from normal operation to creep speed only the end of a Phase winding has to be switched, it is sufficient to connect four terminals to a switching strip respectively. The switchover can then be carried out, for example, by turning over a connecting strap or by means of a single pole changeover switch.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1939L0097651 DE701291C (en) | 1939-04-06 | 1939-04-06 | Circuit to achieve an asynchronous saddle formation |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1939L0097651 DE701291C (en) | 1939-04-06 | 1939-04-06 | Circuit to achieve an asynchronous saddle formation |
Publications (1)
Publication Number | Publication Date |
---|---|
DE701291C true DE701291C (en) | 1941-01-13 |
Family
ID=7288656
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE1939L0097651 Expired DE701291C (en) | 1939-04-06 | 1939-04-06 | Circuit to achieve an asynchronous saddle formation |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE701291C (en) |
-
1939
- 1939-04-06 DE DE1939L0097651 patent/DE701291C/en not_active Expired
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