DE1263370B - Arrangement for measuring the speed of a three-phase asynchronous motor with slip ring rotor - Google Patents

Arrangement for measuring the speed of a three-phase asynchronous motor with slip ring rotor

Info

Publication number
DE1263370B
DE1263370B DE1966S0102609 DES0102609A DE1263370B DE 1263370 B DE1263370 B DE 1263370B DE 1966S0102609 DE1966S0102609 DE 1966S0102609 DE S0102609 A DES0102609 A DE S0102609A DE 1263370 B DE1263370 B DE 1263370B
Authority
DE
Germany
Prior art keywords
voltage
speed
rotor
proportional
arrangement
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.)
Pending
Application number
DE1966S0102609
Other languages
German (de)
Inventor
Dipl-Ing Martin Manowsky
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Priority to DE1966S0102609 priority Critical patent/DE1263370B/en
Publication of DE1263370B publication Critical patent/DE1263370B/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
    • H02H7/093—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against increase beyond, or decrease below, a predetermined level of rotational speed
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
    • G01P3/42—Devices characterised by the use of electric or magnetic means
    • G01P3/44—Devices characterised by the use of electric or magnetic means for measuring angular speed
    • G01P3/46—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring amplitude of generated current or voltage

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Control Of Ac Motors In General (AREA)

Description

Anordnung zur Messung der Drehzahl eines Drehstrom-Asynchronmotors mit Schleifringläufer Die Erfindung betrifft eine Anordnung zur Messung der Drehzahl eines Drehstrom-Asynchronmotors mit Schleifringläufer.Arrangement for measuring the speed of a three-phase asynchronous motor with slip ring rotor The invention relates to an arrangement for measuring the speed a three-phase asynchronous motor with slip ring rotor.

Es ist bekannt, eine drehzahlproportionale Gleichspannung aus einem Quotienten zu bilden, dessen Dividend eine Differenz von zwei Gleichspannungen ist, von denen die eine der Ständerspannung und die andere der Läuferspannung proportional ist und dessen Divisor die der Ständerspannung proportionale Gleichspannung darstellt (deutsche Auslegeschrift 1 111 713). It is known to produce a speed-proportional DC voltage from a To form quotients, the dividend of which is the difference between two DC voltages, one of which is proportional to the stator voltage and the other to the rotor voltage and its divisor represents the DC voltage proportional to the stator voltage (German interpretation document 1 111 713).

Dieses Verfahren ist zwar relativ genau, jedoch durch die zur Quotientenbildung erforderliche Dividiereinrichtung aufwendig. Although this method is relatively precise, it is used for the formation of quotients required dividing device expensive.

Man könnte daran denken, nur die vorerwähnte Differenzgleichspannung zur Gewinnung einer drehzahlproportionalen Gleichspannung zu verwenden, dann wäre zwar der Aufwand durch Fortfall der Dividiereinrichtung wesentlich gesenkt, jedoch würde bei Netzspannungsschwankungen ein Meßfehler auftreten, der dem Produkt aus der Abweichung der Netzspannung vom Nennwert und der Drehzahl proportional ist, also gegebenenfalls gerade bei großen Drehzahlen groß ist. One could think of it, only the above-mentioned differential DC voltage would then be used to obtain a direct voltage proportional to the speed although the effort is significantly reduced by eliminating the dividing device, however a measurement error would occur in the event of mains voltage fluctuations, which would affect the product the deviation of the mains voltage from the nominal value and the speed is proportional, so it may be large, especially at high speeds.

Hier schafft die Erfindung Abhilfe. Sie betrifft eine Anordnung zur Messung der Drehzahl eines Drehstrom-Asynchronmotors mit Schleifringläufer durch Bildung einer Differenzspannung aus zwei Gleichspannungen, von denen die eine der Läuferspannung proportional ist und den Subtrahent darstellt. The invention provides a remedy here. It concerns an arrangement for Measurement of the speed of a three-phase asynchronous motor with slip ring rotor Formation of a differential voltage from two DC voltages, one of which is the The rotor voltage is proportional and represents the subtrahent.

Gemäß der Erfindung besteht die Lösung darin, daß der Minuent eine konstante Gleichspannung ist, die der Läuferstillstandsspannung bei Netznennspannung proportional ist. According to the invention, the solution is that the minute one constant DC voltage is that of the rotor standstill voltage at nominal line voltage is proportional.

Diese Lösung stellt eine wesentliche Verbesserung insbesondere in dem Drehzahlbereich dar, der in der Praxis von Interesse ist, d. h. bei Drehzahlen über 70 O/o der Nenndrehzahl. This solution represents a major improvement in particular in represents the speed range which is of interest in practice, d. H. at speeds over 70 o / o the rated speed.

Die Drehzahlmessung läßt sich darüber hinaus nach einem weiteren Merkmal der neuen Lösung noch dadurch verbessern, daß von der konstanten Gleichspannung außerdem eine weitere Gleichspannung subtrahiert wird, die dem Motorstrom proportional ist. The speed measurement can also be based on a further The feature of the new solution can be improved by the fact that the constant DC voltage In addition, a further DC voltage is subtracted, which is proportional to the motor current is.

Dem liegt zugrunde, daß durch den Ohmschen Anteil des Läuferwiderstandes die Läuferstillstandsspannung niedriger als die tatsächlich induzierte EMK ist. Dieser Unterschied ist proportional der Stromstärke, d. h. der Belastung des Motors. This is based on the fact that the ohmic part of the rotor resistance the rotor standstill voltage is lower than the actually induced EMF. This difference is proportional to the current strength, i. H. the load on the engine.

Außerdem sorgt die vorgenannte stromabhängige Korrektur dafür, daß auch dann eine drehzahl- proportionale Spannung bereitgestellt wird, wenn die Läuferwiderstände kurzgeschlossen sind. In addition, the aforementioned current-dependent correction ensures that even then a speed proportional voltage is provided when the rotor resistances are short-circuited.

An Hand eines Ausführungsbeispieles sei die neue Lösung näher beschrieben. The new solution will be described in more detail using an exemplary embodiment.

Ein Drehstrom-Asynchronmotor 1 mit Schleifringläufer ist ständerseitig an ein nicht dargestelltes Drehstromnetz angeschlossen und läuferseitig mit veränderbaren Schlupfwiderständen 2 verbunden. A three-phase asynchronous motor 1 with slip ring rotor is on the stator side Connected to a three-phase network (not shown) and variable on the rotor side Slip resistors 2 connected.

Einer Konstantspannungsquelle 3 ist ein Spannungsteiler 41, 42 nachgeschaltet. Der Widerstand 41 wird so verstellt, daß am Widerstand 42 eine Gleichspannung abfällt, die der Läuferspannung bei Stillstand des Motors und Netznennspannung proportional ist. Zur Gewinnung einer dem Motorstrom proportionalen Gleichspannung ist in einen Phasenleiter die Primärwicklung eines Stromwandlers 5 eingeschaltet, dessen Sekundärwicklung über eine Gleichrichterschaltung 6 und ein Glättungsglied 7 ein verstellbarer Widerstand 8 nachgeschaltet ist.A voltage divider 41, 42 is connected downstream of a constant voltage source 3. The resistor 41 is adjusted so that a DC voltage drops across the resistor 42, proportional to the rotor voltage when the motor is at a standstill and the nominal line voltage is. To obtain a direct voltage proportional to the motor current, a Phase conductor switched on the primary winding of a current transformer 5, its secondary winding An adjustable resistor via a rectifier circuit 6 and a smoothing element 7 8 is connected downstream.

Die am Widerstand 8 abfallende Spannung ist der am Widerstand42 abfallenden Spannung entgegengerichtet. Gleichgerichtet mit der dem Motorstrom proportionalen Gleichspannung am Widerstand 8 und damit entgegengerichtet der Spannung am Widerstand42 ist eine Spannung, die vom Läufer über eine Gleichrichterschaltung 9, ein Glättungsglied 10 und ein Spannungsteiler 111, 112 gewonnen wird. Diese Gleichspannung ist der im Läufer induzierten Spannung minus dem Spannungsabfall entsprechend dem Ohmschen Anteil der Läuferwicklung proportional. Die Differenz aus den drei Gleichspannungen kann über ein Anzeigeinstrument 12 sichtbar gemacht oder einem Regler als Drehzahlistwert zugeführt werden.The voltage drop across resistor 8 is the voltage drop across resistor 42 Opposite tension. Rectified with that proportional to the motor current DC voltage at resistor 8 and thus in the opposite direction to the voltage at resistor 42 is a voltage generated by the rotor via a rectifier circuit 9, a smoothing element 10 and a voltage divider 111, 112 is obtained. This DC voltage is the voltage induced in the rotor minus the voltage drop corresponding to the ohmic Proportional proportion of rotor winding. The difference between the three DC voltages can be made visible via a display instrument 12 or a controller as an actual speed value are fed.

Claims (2)

Patentansprüche: 1. Anordnung zur Messung der Drehzahl eines Drehstrom-Asynchronmotors mit Schleifringläufcr durch Bildung einer Differenz aus zwei Gleichspannungen, von denen die eine der Läuferspannung proportional ist und den Subtrahenten darstellt, dadurch gekennzeich- n e t, daß der Minuent eine konstante Gleichspannung ist, die der Läuferstillstandsspannung bei Netznennspannung proportional ist. Claims: 1. Arrangement for measuring the speed of a three-phase asynchronous motor with slip ring rotor by forming a difference between two DC voltages, of one of which is proportional to the rotor voltage and represents the subtrahent, characterized by n e t that the minute is a constant DC voltage that the rotor standstill voltage is proportional to the nominal system voltage. 2. Anordnung nach Anspruch 1, dadurch gekennzeichnet, daß eine weitere, dem Motorstrom proportionale Gleichspannung mit der der Läuferspannung proportionalen Gleichspannung in Reihe geschaltet ist. 2. Arrangement according to claim 1, characterized in that a further, DC voltage proportional to the motor current with that proportional to the rotor voltage DC voltage is connected in series.
DE1966S0102609 1966-03-18 1966-03-18 Arrangement for measuring the speed of a three-phase asynchronous motor with slip ring rotor Pending DE1263370B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE1966S0102609 DE1263370B (en) 1966-03-18 1966-03-18 Arrangement for measuring the speed of a three-phase asynchronous motor with slip ring rotor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1966S0102609 DE1263370B (en) 1966-03-18 1966-03-18 Arrangement for measuring the speed of a three-phase asynchronous motor with slip ring rotor

Publications (1)

Publication Number Publication Date
DE1263370B true DE1263370B (en) 1968-03-14

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ID=7524558

Family Applications (1)

Application Number Title Priority Date Filing Date
DE1966S0102609 Pending DE1263370B (en) 1966-03-18 1966-03-18 Arrangement for measuring the speed of a three-phase asynchronous motor with slip ring rotor

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Country Link
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3818343A (en) * 1971-07-31 1974-06-18 Magneti Marelli Spa Electronic device for speed signalling in a d.c. motor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3818343A (en) * 1971-07-31 1974-06-18 Magneti Marelli Spa Electronic device for speed signalling in a d.c. motor

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