DE4210612A1 - Lubrication state determining appts. eg for electric motor - contains microprocessor evaluating bearing revolution rate and temp. during machine operation. - Google Patents

Lubrication state determining appts. eg for electric motor - contains microprocessor evaluating bearing revolution rate and temp. during machine operation.

Info

Publication number
DE4210612A1
DE4210612A1 DE4210612A DE4210612A DE4210612A1 DE 4210612 A1 DE4210612 A1 DE 4210612A1 DE 4210612 A DE4210612 A DE 4210612A DE 4210612 A DE4210612 A DE 4210612A DE 4210612 A1 DE4210612 A1 DE 4210612A1
Authority
DE
Germany
Prior art keywords
microprocessor
machine
temp
lubrication state
appts
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.)
Withdrawn
Application number
DE4210612A
Other languages
German (de)
Inventor
Manfred Dipl Ing Heerlein
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 DE4210612A priority Critical patent/DE4210612A1/en
Publication of DE4210612A1 publication Critical patent/DE4210612A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/66—Special parts or details in view of lubrication
    • F16C33/6637—Special parts or details in view of lubrication with liquid lubricant
    • F16C33/6659—Details of supply of the liquid to the bearing, e.g. passages or nozzles
    • F16C33/6674—Details of supply of the liquid to the bearing, e.g. passages or nozzles related to the amount supplied, e.g. gaps to restrict flow of the liquid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/66—Special parts or details in view of lubrication
    • F16C33/6637—Special parts or details in view of lubrication with liquid lubricant
    • F16C33/6659—Details of supply of the liquid to the bearing, e.g. passages or nozzles
    • F16C33/667—Details of supply of the liquid to the bearing, e.g. passages or nozzles related to conditioning, e.g. cooling, filtering
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16N—LUBRICATING
    • F16N29/00—Special means in lubricating arrangements or systems providing for the indication or detection of undesired conditions; Use of devices responsive to conditions in lubricating arrangements or systems
    • F16N29/04—Special means in lubricating arrangements or systems providing for the indication or detection of undesired conditions; Use of devices responsive to conditions in lubricating arrangements or systems enabling a warning to be given; enabling moving parts to be stopped
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16P—SAFETY DEVICES IN GENERAL; SAFETY DEVICES FOR PRESSES
    • F16P7/00—Emergency devices preventing damage to a machine or apparatus
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M13/00—Testing of machine parts
    • G01M13/04—Bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16N—LUBRICATING
    • F16N2230/00—Signal processing
    • F16N2230/02—Microprocessor; Microcomputer
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16N—LUBRICATING
    • F16N2230/00—Signal processing
    • F16N2230/10—Timing network
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16N—LUBRICATING
    • F16N2250/00—Measuring
    • F16N2250/08—Temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16N—LUBRICATING
    • F16N2250/00—Measuring
    • F16N2250/16—Number of revolutions, RPM

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Rolling Contact Bearings (AREA)

Abstract

A microprocessor (6) receives constants for the current machine being evaluated. Values for the revolution rate and temp. of the bearing (1) are continuously fed into the microprocessor and evaluated during operation of the machine. Alternatively, the values can be fed into the microprocessor at short time intervals. The microprocessor controls a display device (11) and/or an alarm device. USE/ADVANTAGE - Reliable indication of bearing's lubrication state is achieved for machine with variable speed and load.

Description

Die Erfindung betrifft eine Vorrichtung zur Ermittlung des Schmierzustandes der Lager einer Maschine.The invention relates to a device for determining the Lubrication status of the bearings of a machine.

Für den störungsfreien Betrieb von Maschinen, z. B. Elektro­ motoren, ist es wichtig den Schmierzustand der Lager der Maschine zu kennen, um rechtzeitig entsprechende Maßnahmen, z. B. ein Nachschmieren oder gegebenenfalls einen Austausch der Lager einleiten zu können. Nur so lassen sich größere Beschädigungen, die zu entsprechenden Ausfallzeiten der Maschinen führen, vermeiden.For the trouble-free operation of machines, e.g. B. Electro motors, it is important to check the lubrication condition of the bearings To know the machine in order to take appropriate measures in good time, e.g. B. relubrication or, if necessary, an exchange to initiate the camp. This is the only way to get bigger ones Damages that result in corresponding downtime of the Lead machines, avoid them.

Im Laufe der Zeit hat man für die einzelnen Maschinen Erfahrungswerte gesammelt, anhand derer die Zeiten für die jeweils durchzuführenden Maßnahmen festgelegt werden. Für Maschinen, die mit konstanter Drehzahl laufen und deren Lagertemperaturen ebenfalls annähernd gleichbleibende Werte aufweisen, ist eine Festlegung der Zeiten für die jeweiligen Maßnahmen aufgrund der Erfahrungswerte durchaus ausreichend.Over time you have for the individual machines Experiences gathered, based on which the times for the measures to be carried out. For Machines that run at constant speed and their Storage temperatures also approximately constant values have a time setting for each Measures based on past experience are sufficient.

Dies trifft jedoch nicht mehr zu, wenn die Maschinen mit veränderlicher Drehzahl laufen und/oder unterschiedliche Leistung abgeben müssen. Die unterschiedliche Leistungs­ abgabe führt zu einer entsprechenden veränderlichen Erwärmung der Maschine und damit auch deren Lager.However, this no longer applies if the machines are with variable speed run and / or different Have to deliver power. The different performance levy leads to a corresponding variable Warming up the machine and thus its bearings.

Der Erfindung liegt daher die Aufgabe zugrunde, eine Vor­ richtung zu schaffen, die für eine mit veränderlicher Dreh­ zahl und/oder wechselnder Leistung arbeitende Maschine eine verläßliche Aussage über den Schmierzustand der Lager liefert.The invention is therefore based on the object to create direction for one with variable rotation  number and / or changing performance of a machine reliable statement about the lubrication condition of the bearings delivers.

Diese Aufgabe wird mittels einer Vorrichtung zur Ermittlung des Schmierzustandes der Lager einer Maschine dadurch gelöst, daß einem Mikroprozessor, dem eine der betreffenden Maschine eigene Konstante eingebbar ist, während des Betriebes der Maschine ständig die Werte der jeweiligen Drehzahl und der Temperatur des Lagers zugeführt und von diesem ausgewertet sind.This task is carried out by means of a device for determination the lubrication condition of the bearings of a machine solved that a microprocessor that one of the concerned Machine's own constant can be entered during the Operating the machine constantly the values of the respective Speed and the temperature of the bearing supplied and by this are evaluated.

Die Werte können dem Mikroprozessor kontinuierlich einge­ geben werden. Um den Aufwand gering zu halten ist auch eine Eingabe der Werte in kurzen Zeitabständen möglich, wobei Zeitabstände von einigen Sekunden ausreichend sind.The values can be continuously input to the microprocessor will give. To keep the effort to a minimum, there is also one The values can be entered at short intervals, whereby Time intervals of a few seconds are sufficient.

Vorteilhaft ist es, durch den Mikroprozessor eine Anzeige­ und/oder Alarmeinrichtung zu steuern.It is advantageous to have a display by the microprocessor and / or control alarm device.

Anhand eines in der Zeichnung dargestellten Blockschalt­ bildes wird die Erfindung nachfolgend näher beschrieben.Using a block circuit shown in the drawing The invention is described in more detail below.

Mit 1 ist ein auf einer Welle 2 einer Maschine angeordnetes Lager bezeichnet, das mit Schmiermittel gefüllte Aufnahme­ räume 3 aufweist. Um den Schmierzustand des Lagers 1 während der Betriebsdauer der Maschine überwachen zu können, ist an dem das Lager 1 aufnehmenden Lagerschild 4 ein Temperatur­ fühler 5 in der Nähe der Lagers 1 angeordnet. Die von dem Temperaturfühler 5 ermittelten Temperaturwerte werden einem Mikroprozessor 6 zugeführt. With 1 is arranged on a shaft 2 of a machine bearing, which has spaces 3 filled with lubricant. In order to monitor the state of lubrication of the bearing 1 during the operating period of the engine, a temperature sensor 5 is disposed in the vicinity of the bearing 1 to which the bearing 1 receiving end shield. 4 The temperature values determined by the temperature sensor 5 are fed to a microprocessor 6 .

Mit 7 ist ein Drehzahlerfassungsgerät bezeichnet, das der Welle 2 der Maschine zugeordnet ist. Die von diesem Gerät 7 gemessenen Drehzahlwerte werden ebenfalls dem Mikroprozessor 6 zugeführt. Die Erfassung der jeweiligen Maschinenlaufzeit kann mittels eines externen Zeitgebers 8, der jeweils beim Einschalten der Maschine gestartet und beim Abschalten der­ selben gestoppt wird, erfolgen. Der Zeitgeber 8 übermittelt die gemessene Einschaltdauer an den Mikroprozessor 6. Es besteht auch die Möglichkeit die Laufzeit intern im Mikro­ prozessor anhand es Vorhandenseins von Drehzahlwerten zu ermitteln.With 7 a speed detection device is designated, which is assigned to the shaft 2 of the machine. The speed values measured by this device 7 are also fed to the microprocessor 6 . The respective machine running time can be recorded by means of an external timer 8 , which is started each time the machine is switched on and stopped when the machine is switched off. The timer 8 transmits the measured duty cycle to the microprocessor 6 . It is also possible to determine the runtime internally in the microprocessor based on the presence of speed values.

Der Mikroprozessor 6 kann anhand der über einen Kommuni­ kationseingang 9 eingegebenen Maschinenkonstante und der von Temperaturfühler 5, dem Drehzahlerfassungsgerät 7 und dem Zeitgeber 8 jeweils übermittelten Werte den für eine Nach­ schmierung oder gegebenenfalls Lageraustausch notwendigen Zeitpunkt errechnen.The microprocessor 6 can, based on the machine input entered via a communication input 9 and the values transmitted by temperature sensor 5 , the speed detection device 7 and the timer 8 , calculate the time required for relubrication or, if necessary, bearing replacement.

Das ermittelte Ergebnis wird anhand eines mit einem Signal­ ausgang 10 des Mikroprozessors 6 verbundenen Anzeigegerätes 11 angezeigt. Anstelle des Anzeigegerätes 11 oder zusätzlich zu diesem kann auch ein Alarmgerät von dem Mikroprozessor 6 betätigt werden.The determined result is displayed using a display device 11 connected to a signal output 10 of the microprocessor 6 . Instead of the display device 11 or in addition to this, an alarm device can also be actuated by the microprocessor 6 .

Es besteht auch die Möglichkeit nicht erst bei Erreichen des notwendigen Nachschmierzeitpunktes eine Anzeige zu geben, sondern schon vorher die jeweils erreichte Verbrauchsdauer für das Schmiermittel anzuzeigen. Damit kann für die jeweils durchzuführende Maßnahme rechtzeitig Vorsorge getroffen werden.There is also the possibility not only when it is reached an indication of the necessary relubrication time give, but the previously achieved Display the period of use for the lubricant. In order to can timely for the measure to be carried out Precautions are taken.

Claims (3)

1. Vorrichtung zum Ermitteln des Schmierzustandes der Lager einer Maschine, bei welcher Vorrichtung einem Mikroprozessor (6), dem eine der betreffenden Maschine eigene Konstante eingebbar ist, während des Betriebes der Maschine ständig die Werte der jeweiligen Drehzahl und der Temperatur des Lagers (1) zugeführt und von diesem ausgewertet sind.1. Device for determining the lubrication state of the bearings of a machine, in which device a microprocessor ( 6 ), to which a constant of the machine in question can be input, the values of the respective speed and the temperature of the bearing ( 1 ) continuously during operation of the machine fed and evaluated by this. 2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Drehzahl- und Temperaturwerte in kurzen Zeit­ abständen dem Mikroprozessor (6) zugeführt sind.2. Device according to claim 1, characterized in that the speed and temperature values are supplied to the microprocessor ( 6 ) at short intervals. 3. Vorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß durch den Mikroprozessor (6) eine Anzeigeeinrichtung (11) und/oder Alarmeinrichtung gesteuert ist.3. Apparatus according to claim 1 or 2, characterized in that a display device ( 11 ) and / or alarm device is controlled by the microprocessor ( 6 ).
DE4210612A 1992-03-31 1992-03-31 Lubrication state determining appts. eg for electric motor - contains microprocessor evaluating bearing revolution rate and temp. during machine operation. Withdrawn DE4210612A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE4210612A DE4210612A1 (en) 1992-03-31 1992-03-31 Lubrication state determining appts. eg for electric motor - contains microprocessor evaluating bearing revolution rate and temp. during machine operation.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE4210612A DE4210612A1 (en) 1992-03-31 1992-03-31 Lubrication state determining appts. eg for electric motor - contains microprocessor evaluating bearing revolution rate and temp. during machine operation.

Publications (1)

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DE4210612A1 true DE4210612A1 (en) 1993-10-07

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0864402A1 (en) * 1997-03-13 1998-09-16 Wella Aktiengesellschaft Process and device for detecting oil shortage of an electrically driven cutting knife of a hair cutting machine
WO2006056564A1 (en) * 2004-11-25 2006-06-01 Siemens Aktiengesellschaft Machine system with a machine that comprises a base body and an additional body
DE102006051441A1 (en) * 2006-10-31 2008-05-08 Siemens Ag Mechanical device with lubricant sensor for lubricant-independent property of the lubricant

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Publication number Priority date Publication date Assignee Title
DE2904060A1 (en) * 1979-02-02 1980-08-14 Loher Gmbh Automatic lubricating system for roller bearing - applies grease or oil to bearing depending on electronically measured temp. of bearing
JPS5674632A (en) * 1979-11-26 1981-06-20 Hitachi Ltd Abnormality diagnostic method of bearing
JPS56154640A (en) * 1980-05-02 1981-11-30 Hitachi Ltd Method for monitoring bearing
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JPS588823A (en) * 1981-07-08 1983-01-19 Hitachi Ltd Diagnosis method for abnormality in bearing
DE3234443A1 (en) * 1982-01-18 1983-07-21 VEB Werkzeugmaschinenkombinat "Fritz Heckert" Karl-Marx-Stadt, DDR 9030 Karl-Marx-Stadt Device for detecting thermally active changes of state in bearings
JPS5943299A (en) * 1982-09-02 1984-03-10 Nippon Denso Co Ltd Device for indicating exchange timing of lubricating oil for vehicle
JPS59180198A (en) * 1983-03-29 1984-10-13 Kawasaki Heavy Ind Ltd Method and apparatus for controlling feed oil temperature for supercharger bearing
AT380954B (en) * 1984-12-21 1986-08-11 Voest Alpine Ag ARRANGEMENT FOR MONITORING THE LUBRICATION OF A SLIDE BEARING
JPS61192996A (en) * 1985-02-22 1986-08-27 Nissan Motor Co Ltd Replacement warning device of lubricating oil for vehicle
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DE3613484A1 (en) * 1986-04-22 1987-10-29 Siegfried Hartmann Swivel motor with integrated cylinder in the pinion
SU1479740A1 (en) * 1987-08-11 1989-05-15 Институт ядерной энергетики АН БССР Method and apparatus for monitoring friction pair duty
SU1530848A1 (en) * 1987-09-29 1989-12-23 Севастопольское Высшее Военно-Морское Инженерное Училище Sliding-contact bearing with performance mechanism device
JPH02138517A (en) * 1988-11-17 1990-05-28 Toyoda Mach Works Ltd Oil temperature controller for static pressure bearing
DD217599B1 (en) * 1983-09-20 1990-07-18 Auerbach Werkzeugmaschf Veb METHOD OF MONITORING AND EVALUATING THE REINFORCING CONDITIONS IN PARTICULAR LONG-TERM FAT LUBRICATIONS
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JPH0341218A (en) * 1989-07-10 1991-02-21 Hitachi Ltd Lubricating device for bearing in vacuum

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2904060A1 (en) * 1979-02-02 1980-08-14 Loher Gmbh Automatic lubricating system for roller bearing - applies grease or oil to bearing depending on electronically measured temp. of bearing
JPS5674632A (en) * 1979-11-26 1981-06-20 Hitachi Ltd Abnormality diagnostic method of bearing
JPS56154640A (en) * 1980-05-02 1981-11-30 Hitachi Ltd Method for monitoring bearing
SU976324A1 (en) * 1981-01-29 1982-11-23 Всесоюзный Научно-Исследовательский Технологический Институт Восстановления Изношенных Деталей Машин Всесоюзного Научно-Производственного Объединения "Ремдеталь" Bearing radial clearence determination method
JPS588823A (en) * 1981-07-08 1983-01-19 Hitachi Ltd Diagnosis method for abnormality in bearing
DE3234443A1 (en) * 1982-01-18 1983-07-21 VEB Werkzeugmaschinenkombinat "Fritz Heckert" Karl-Marx-Stadt, DDR 9030 Karl-Marx-Stadt Device for detecting thermally active changes of state in bearings
JPS5943299A (en) * 1982-09-02 1984-03-10 Nippon Denso Co Ltd Device for indicating exchange timing of lubricating oil for vehicle
JPS59180198A (en) * 1983-03-29 1984-10-13 Kawasaki Heavy Ind Ltd Method and apparatus for controlling feed oil temperature for supercharger bearing
DD217599B1 (en) * 1983-09-20 1990-07-18 Auerbach Werkzeugmaschf Veb METHOD OF MONITORING AND EVALUATING THE REINFORCING CONDITIONS IN PARTICULAR LONG-TERM FAT LUBRICATIONS
AT380954B (en) * 1984-12-21 1986-08-11 Voest Alpine Ag ARRANGEMENT FOR MONITORING THE LUBRICATION OF A SLIDE BEARING
JPS61192996A (en) * 1985-02-22 1986-08-27 Nissan Motor Co Ltd Replacement warning device of lubricating oil for vehicle
SU1278507A1 (en) * 1985-05-15 1986-12-23 Уральский Филиал Всесоюзного Дважды Ордена Трудового Красного Знамени Теплотехнического Научно-Исследовательского Института Им.Ф.Э.Дзержинского Method for checking bearing operation
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DE3613484A1 (en) * 1986-04-22 1987-10-29 Siegfried Hartmann Swivel motor with integrated cylinder in the pinion
SU1479740A1 (en) * 1987-08-11 1989-05-15 Институт ядерной энергетики АН БССР Method and apparatus for monitoring friction pair duty
SU1530848A1 (en) * 1987-09-29 1989-12-23 Севастопольское Высшее Военно-Морское Инженерное Училище Sliding-contact bearing with performance mechanism device
JPH02138517A (en) * 1988-11-17 1990-05-28 Toyoda Mach Works Ltd Oil temperature controller for static pressure bearing
JPH0341218A (en) * 1989-07-10 1991-02-21 Hitachi Ltd Lubricating device for bearing in vacuum

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* Cited by examiner, † Cited by third party
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PITTROFF, Hans; WEDE, Horst: Wälzlagerfunktion kontrollieren mittels Temperturüberwachung. In: Maschinenmarkt,Würzburg,84,1978,S.1598-1600 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0864402A1 (en) * 1997-03-13 1998-09-16 Wella Aktiengesellschaft Process and device for detecting oil shortage of an electrically driven cutting knife of a hair cutting machine
WO2006056564A1 (en) * 2004-11-25 2006-06-01 Siemens Aktiengesellschaft Machine system with a machine that comprises a base body and an additional body
DE102006051441A1 (en) * 2006-10-31 2008-05-08 Siemens Ag Mechanical device with lubricant sensor for lubricant-independent property of the lubricant
DE102006051441B4 (en) * 2006-10-31 2018-05-17 Siemens Aktiengesellschaft Method for determining at least one electrical variable

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