AT237076B - Device to protect electric motors when starting - Google Patents
Device to protect electric motors when startingInfo
- Publication number
- AT237076B AT237076B AT821061A AT821061A AT237076B AT 237076 B AT237076 B AT 237076B AT 821061 A AT821061 A AT 821061A AT 821061 A AT821061 A AT 821061A AT 237076 B AT237076 B AT 237076B
- Authority
- AT
- Austria
- Prior art keywords
- capacitor
- starting
- motor current
- electric motors
- jdt
- Prior art date
Links
Description
<Desc/Clms Page number 1>
Einrichtung zum Schutz von Elektromotoren beim Anlauf
EMI1.1
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Impulse aussendet, die von der Drehbewegung des Motors herrühren. Mittels eines Regelwiderstandes 6 kann die Aufladezeitdes Kondensators 3. nach Belieben eingestellt werden. Sobald die Spannung am Kondensator einen kritischen Wert UC1 überschreitet, kippt ein weiteres Kippglied 7, wodurch die Meldung beispielsweise durch eine Relaisanordnung 8 ausgelöst wird. Löschungen dieser Meldung können sowohl vom Drehbewegungsgeber 5 als auch vom Kippglied 4 aus erfolgen, womit eine selbsttätige Rückstellung bewirkt werden kann.
Mit Hilfe des Regelwiderstandes 6 und durch Wahl der Widerstandskombination 2 kann die Stromabhängigkeit der Anordnung beeinflusst werden, wobei sich etwa eine Strom-Zeit-Abhängigkeit nach Fig. 2 ergibt. In dieser stellt der Bereich I die zulässigen und der Bereich II die für den Motor gefährlichen Werte dar. Die beiden Bereiche sind hier durch eine Kurve J2t = const und durch die Gerade J = Jo getrennt.
Im Blockschaltbild Fig. 1 sind die für die Funktion notwendigen zusätzlichen Schalteinrichtungen (Dioden, Widerstände, Transistoren u. dgl.) nur grundsätzlich und ohne Positionsangabe dargestellt.
Die Erfindung ermöglicht es unter anderem, Motorschäden beim Anfahren elektrischer Lokomotiven zu vermeiden.
PATENTANSPRÜCHE : 1. Einrichtung zum Schutz vor während des Stillstandes eines stromdurchflossenen Motors eintretender Überheizung einzelner Motorteile, insbesondere Kollektorlamellen, durch Mittel, die bei Bewegung des Motors unwirksam gemacht werden, dadurch gekennzeichnet, dass ein integrierend wirkendes, die zunehmende Überheizungsgefahr darstellendes Element, insbesondere ein Kondensator (3), dessen Spannung überwacht ist und dessen Ladung verändert wird, wenn Motorstrom fliesst und der Motor stillsteht, durch Ansprechen einer die Drehbewegung des Motors erfassenden Anordnung (5) in einer Zeitspanne in einen Ausgangszustand zurückversetzt, also z. B. entladen wird, die kleiner, vorzugsweise viel kleiner ist, als die kürzeste Ansprechzeit der Schutzeinrichtung.
<Desc / Clms Page number 1>
Device to protect electric motors when starting
EMI1.1
<Desc / Clms Page number 2>
Sends out impulses resulting from the rotation of the motor. The charging time of the capacitor 3 can be adjusted as desired by means of a variable resistor 6. As soon as the voltage at the capacitor exceeds a critical value UC1, another flip-flop 7 flips, whereby the message is triggered by a relay arrangement 8, for example. This message can be deleted both from the rotary motion sensor 5 and from the flip-flop 4, with which an automatic reset can be effected.
The current dependency of the arrangement can be influenced with the aid of the variable resistor 6 and by selecting the resistor combination 2, with a current-time dependency according to FIG. 2, for example. In this area I represents the permissible values and area II the dangerous values for the engine. The two areas are separated here by a curve J2t = const and the straight line J = Jo.
In the block diagram of FIG. 1, the additional switching devices (diodes, resistors, transistors and the like) required for the function are only shown in principle and without any position information.
The invention makes it possible, inter alia, to avoid engine damage when starting electric locomotives.
PATENT CLAIMS: 1. Device to protect against overheating of individual motor parts, in particular collector lamellas, occurring during the standstill of a motor through which current flows, by means which are rendered ineffective when the motor is moving, characterized in that an integrating element which represents the increasing risk of overheating, in particular a Capacitor (3), the voltage of which is monitored and whose charge is changed when the motor current flows and the motor is at a standstill. B. is discharged, which is smaller, preferably much smaller, than the shortest response time of the protective device.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT821061A AT237076B (en) | 1961-10-31 | 1961-10-31 | Device to protect electric motors when starting |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT821061A AT237076B (en) | 1961-10-31 | 1961-10-31 | Device to protect electric motors when starting |
Publications (1)
Publication Number | Publication Date |
---|---|
AT237076B true AT237076B (en) | 1964-11-25 |
Family
ID=3603493
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
AT821061A AT237076B (en) | 1961-10-31 | 1961-10-31 | Device to protect electric motors when starting |
Country Status (1)
Country | Link |
---|---|
AT (1) | AT237076B (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2395348A1 (en) * | 1977-06-24 | 1979-01-19 | Radiotechnique Compelec | Safety circuit for washing machine, permanent magnet motor - uses counter EMF to close interrupter shunting diode pump |
DE3312288A1 (en) * | 1982-04-02 | 1983-11-10 | Hitachi Ltd | PERFORMANCE INVERTER |
-
1961
- 1961-10-31 AT AT821061A patent/AT237076B/en active
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2395348A1 (en) * | 1977-06-24 | 1979-01-19 | Radiotechnique Compelec | Safety circuit for washing machine, permanent magnet motor - uses counter EMF to close interrupter shunting diode pump |
DE3312288A1 (en) * | 1982-04-02 | 1983-11-10 | Hitachi Ltd | PERFORMANCE INVERTER |
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