EP0886068B1 - Gear pump with multiple driven shafts - Google Patents

Gear pump with multiple driven shafts Download PDF

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Publication number
EP0886068B1
EP0886068B1 EP98115962A EP98115962A EP0886068B1 EP 0886068 B1 EP0886068 B1 EP 0886068B1 EP 98115962 A EP98115962 A EP 98115962A EP 98115962 A EP98115962 A EP 98115962A EP 0886068 B1 EP0886068 B1 EP 0886068B1
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EP
European Patent Office
Prior art keywords
gear pump
units
control
unit
control device
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Expired - Lifetime
Application number
EP98115962A
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German (de)
French (fr)
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EP0886068A3 (en
EP0886068A2 (en
Inventor
Maurice Bussard
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.)
Maag Pump Systems AG
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Maag Pump Systems AG
Maag Pump Systems Textron AG
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Publication date
Application filed by Maag Pump Systems AG, Maag Pump Systems Textron AG filed Critical Maag Pump Systems AG
Priority to EP98115962A priority Critical patent/EP0886068B1/en
Priority to DE59809839T priority patent/DE59809839D1/en
Publication of EP0886068A2 publication Critical patent/EP0886068A2/en
Publication of EP0886068A3 publication Critical patent/EP0886068A3/en
Priority to US09/382,830 priority patent/US6312225B1/en
Priority to US09/963,558 priority patent/US6447256B2/en
Application granted granted Critical
Publication of EP0886068B1 publication Critical patent/EP0886068B1/en
Anticipated expiration legal-status Critical
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F04C15/0057—Driving elements, brakes, couplings, transmission specially adapted for machines or pumps
    • F04C15/008—Prime movers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2240/00—Components
    • F04C2240/40—Electric motor
    • F04C2240/402—Plurality of electronically synchronised motors

Definitions

  • the present invention relates to a gear pump according to the preamble of claim 1.
  • gear pumps are over a single, off driven shaft led out of the pump housing.
  • Two-shaft drives used to advance the tooth flanks Wear or overload protection.
  • Well-known multi-shaft drives consist of distribution gears (timing gear), with which it succeeds that the Do not touch the tooth flanks.
  • this known Multi-shaft drive comes to a single drive unit Use, with the force distribution on the individual waves with the meshing gears over the mentioned Distribution gear takes place.
  • DE-32 30 550 C2 is also a teaching known in the case of a two-shaft drive with two Drive units is described. Come here DC motors for use with a control unit, the on current measurements in the exciter circuit both Drive units and a speed measurement at a Drive unit based. In this known teaching can a target speed and a target power ratio be specified.
  • a disadvantage of the latter drive concept is that made by the only one-sided Speed monitoring in the case of a clutch, gear or Pump gear damage not speed monitored Strang consequential damage by striving for the target performance can cause. Furthermore, that is Power ratio in a narrow range from 0.5 to 1 adjustable. Last but not least, this system is not suitable, torque pulsations due to on the Line of action wandering engagement point, due to least gear inaccuracies or even Differences in the stiffness of the engine and Gearbox mounting to capture and approve consider.
  • WO 94/29596 is also a positive displacement machine for known compressible media.
  • positive displacement machines may not trained as profiled body rotors touch.
  • Displacement machines are not suitable for conveying of incompressible fluids.
  • From DE 39 28 451 is a device for control an electric drive system described that several drives, as for example at different synchronous motors of a printing machine is used.
  • the known doctrine refers here especially on the shield against electromagnetic Disorders and contains no information in relation to the Control of gear pumps.
  • the present invention is therefore the task to provide a gear pump, which the does not have the above-mentioned disadvantages.
  • the invention has the following advantages: completely symmetrical structure for the control units for controlling the drive units and moreover one fast data line between the two in the Control units contained control units provided are achieved, that despite any Torque pulses on the shafts the tooth flanks neither take off, still that too high a surplus torque over the tooth flanks can be transferred.
  • the figure shows a schematic representation of a Gear pump with a two-shaft drive and two Control units SE1 and SE2 according to the invention.
  • the Gear pump consists essentially of two meshing gears Z1 and Z2, the two different waves W1 and W2 are assigned.
  • the Gears Z1 and Z2 and the shafts W1 and W2 are in one Pump housing G included, the waves W1 and W2 after guided outside and the lead-out ends of the waves W1 and W2 each with a drive unit AE1 resp. AE2 coupled are.
  • the control units SE1 and SE2 are according to the invention symmetrically constructed and consist essentially of each a control unit KE1 or KE2, one inverter each WR1 or WR2 as a power converter and one each Speed measuring unit DME1 or DME2 as measuring units, the each with one mounted on shafts W1 and W2 Signalers known type are connected.
  • Speed measuring units DME1 and DME2 will be in the signal transmitter measured signal to determine the angular velocities ⁇ 1 and ⁇ 2 processed, this subsequently to the Control units KE1 or KE2 are transmitted.
  • control unit KE1 or KE2 control signals SS1 or SS2 for driving the inverter WR1 or WR2 generated.
  • SS1 or SS2 for driving the inverter WR1 or WR2 generated.
  • AE2 uses, with which possible nonlinearities or asymmetries of inverters WR1 or WR2 be automatically compensated.
  • the Drive units AE1 and AE2 of the type electrical Asynchronous machines (Rolf Fischer, "Electrical Machines", 5th edition, Carl Hanser Verlag, 1983, pages 170 to 260).
  • the generated by the inverter WR1 and WR2 Output signals are in the figure with U1 and U2 for the electrical voltage, with I1 or I2 for the electrical Current and denoted by F1 or F2 for the frequency.
  • a fast data line DL preferably in the form of a data bus, provided via which the angular velocities ⁇ 1 and ⁇ 2 of the waves W1 and W2 and the position of the gears Z1 and Z2 to each other can be exactly tuned or adjusted.
  • the Data line DL is provided that Angular velocity differences safely within the Control units SE1 and SE2 processed and that despite any torque pulses neither lifting the Tooth flanks is effected, which should remain in contact, nor that too much excess torque over the Tooth flanks is transmitted.
  • the trained as a data bus Data line DL is connected to a computing unit, via for example, made a speed adjustment can be, especially in the context of others Process components with which the gear pump connected is.

Description

Die vorliegende Erfindung betrifft eine Zahnradpumpe nach dem Oberbegriff des Patentanspruchs 1.The present invention relates to a gear pump according to the preamble of claim 1.

Üblicherweise werden Zahnradpumpen über eine einzige, aus dem Pumpengehäuse herausgeführte Welle angetrieben. In Fällen sehr hoher Drehmomente oder bei Füllstoffbeladung des Fördermediums werden gelegentlich auch Zweiwellenantriebe eingesetzt, um die Zahnflanken vor Verschleiss oder Überbelastung zu schützen.Usually, gear pumps are over a single, off driven shaft led out of the pump housing. In Cases of very high torques or with filler loading of the sponsored medium are occasionally too Two-shaft drives used to advance the tooth flanks Wear or overload protection.

Bekannte Mehrwellenantriebe bestehen aus Verteilgetrieben (timing gear), mit denen es gelingt, dass sich die Zahnflanken nicht berühren. Bei diesem bekannten Mehrwellenantrieb kommt eine einzige Antriebseinheit zum Einsatz, wobei die Kraftverteilung auf die einzelnen Wellen mit den ineinandergreifenden Zahnrädern über das erwähnte Verteilgetriebe erfolgt.Well-known multi-shaft drives consist of distribution gears (timing gear), with which it succeeds that the Do not touch the tooth flanks. In this known Multi-shaft drive comes to a single drive unit Use, with the force distribution on the individual waves with the meshing gears over the mentioned Distribution gear takes place.

In der DE-32 30 550 C2 ist darüber hinaus eine Lehre bekannt, bei der ein Zweiwellenantrieb mit zwei Antriebseinheiten beschrieben wird. Hierbei kommen Gleichstrommotoren zum Einsatz mit einer Regeleinheit, die auf Strommessungen im Erregerstromkreis beider Antriebseinheiten und einer Drehzahlmessung bei einer Antriebseinheit beruht. Bei dieser bekannten Lehre können eine Soll-Drehzahl und ein Soll-Leistungsverhältnis vorgegeben werden. In DE-32 30 550 C2 is also a teaching known in the case of a two-shaft drive with two Drive units is described. Come here DC motors for use with a control unit, the on current measurements in the exciter circuit both Drive units and a speed measurement at a Drive unit based. In this known teaching can a target speed and a target power ratio be specified.

Nachteilige bei dem letztgenannten Antriebskonzept ist, dass durch die nur einseitig vorgenommene Drehzahlüberwachung im Falle eines Kupplungs-, Getriebeoder Pumpenverzahnungsschadens der nicht Drehzahlüberwachte Strang Folgeschäden durch Anstreben der Soll-Leistung hervorrufen kann. Des weiteren ist das Leistungsverhältnis in einem nur engen Bereich von 0.5 bis 1 einstellbar. Nicht zuletzt ist dieses System nicht geeignet, Drehmomentpulsationen aufgrund des auf der Eingriffslinie wandernden Eingriffspunktes, aufgrund von geringsten Verzahnungsungenauigkeiten oder auch Unterschiede in den Steifigkeiten der Motor- und Getriebebefestigung angemessen zu erfassen und zu berücksichtigen.A disadvantage of the latter drive concept is that made by the only one-sided Speed monitoring in the case of a clutch, gear or Pump gear damage not speed monitored Strang consequential damage by striving for the target performance can cause. Furthermore, that is Power ratio in a narrow range from 0.5 to 1 adjustable. Last but not least, this system is not suitable, torque pulsations due to on the Line of action wandering engagement point, due to least gear inaccuracies or even Differences in the stiffness of the engine and Gearbox mounting to capture and approve consider.

Aus WO 94/29596 ist ferner eine Verdrängermaschine für kompressible Medien bekannt. Bei Verdrängermaschinen dürfen sich die als Profilkörper ausgebildeten Rotoren nicht berühren. Verdrängermaschinen eignen sich nicht zum Fördern von inkompressiblen Fördermedien.From WO 94/29596 is also a positive displacement machine for known compressible media. For positive displacement machines may not trained as profiled body rotors touch. Displacement machines are not suitable for conveying of incompressible fluids.

Aus der DE 39 28 451 ist eine Vorrichtung zur Regelung eines elektrischen Antriebssystems beschrieben, das aus mehreren Antrieben besteht, wie es beispielsweise bei verschiedenen gleichlaufenden Motoren einer Druckmaschine verwendet wird. Die bekannte Lehre bezieht sich dabei besonders auf die Abschirmung gegen elektromagnetische Störungen und enthält keine Angaben in Bezug auf die Steuerung von Zahnradpumpen. Der vorliegenden Erfindung liegt daher die Aufgabe zugrunde, eine Zahnradpumpe anzugeben, welche die obenerwähnten Nachteile nicht aufweist.From DE 39 28 451 is a device for control an electric drive system described that several drives, as for example at different synchronous motors of a printing machine is used. The known doctrine refers here especially on the shield against electromagnetic Disorders and contains no information in relation to the Control of gear pumps. The present invention is therefore the task to provide a gear pump, which the does not have the above-mentioned disadvantages.

Diese Aufgabe wird durch die im kennzeichnenden Teil des Patentanspruchs 1 angegebenen Massnahmen gelöst. Vorteilhafte Ausgestaltungen der Erfindung sind in weiteren Ansprüchen angegeben.This object is achieved by the in the characterizing part of Patent claim 1 specified measures solved. Advantageous embodiments of the invention are in further Claims specified.

Die Erfindung weist folgende Vorteile auf: Indem eine vollständig symmetrische Struktur für die Steuereinheiten zur Steuerung der Antriebseinheiten und darüber hinaus eine schnelle Datenleitung zwischen den beiden in den Steuereinheiten enthaltenen Kontrolleinheiten vorgesehen sind, wird erreicht, dass trotz allfälligen Drehmomentpulsen auf den Wellen die Zahnflanken weder abheben, noch dass ein zu hohes Überschussdrehmoment über die Zahnflanken übertragen werden kann.The invention has the following advantages: completely symmetrical structure for the control units for controlling the drive units and moreover one fast data line between the two in the Control units contained control units provided are achieved, that despite any Torque pulses on the shafts the tooth flanks neither take off, still that too high a surplus torque over the tooth flanks can be transferred.

Die Erfindung wird nachfolgend anhand einer Zeichnung beispielsweise näher erläutert. Dabei zeigt die einzige Figur in schematischer Darstellung eine Zahnradpumpe mit zwei identischen Steuereinheiten gemäss der Erfindung.The invention will be described below with reference to a drawing, for example explained in more detail. The only figure shows in a schematic representation of a gear pump with two identical control units according to the invention.

Die Figur zeigt in schematischer Darstellung eine Zahnradpumpe mit einem Zweiwellenantrieb und zwei erfindungsgemässen Steuereinheiten SE1 und SE2. Die Zahnradpumpe besteht im wesentlichen aus zwei ineinandergreifenden Zahnrädern Z1 und Z2, die zwei verschiedenen Wellen W1 und W2 zugeordnet sind. Die Zahnräder Z1 und Z2 und die Wellen W1 und W2 sind in einem Pumpengehäuse G enthalten, wobei die Wellen W1 und W2 nach aussen geführt und die herausgeführten Enden der Wellen W1 und W2 je mit einer Antriebseinheit AE1 resp. AE2 gekoppelt sind.The figure shows a schematic representation of a Gear pump with a two-shaft drive and two Control units SE1 and SE2 according to the invention. The Gear pump consists essentially of two meshing gears Z1 and Z2, the two different waves W1 and W2 are assigned. The Gears Z1 and Z2 and the shafts W1 and W2 are in one Pump housing G included, the waves W1 and W2 after guided outside and the lead-out ends of the waves W1 and W2 each with a drive unit AE1 resp. AE2 coupled are.

Die Steuereinheiten SE1 und SE2 sind erfindungsgemäss symmetrisch aufgebaut und bestehen im wesentlichen aus je einer Kontrolleinheit KE1 bzw. KE2, je einem Wechselrichter WR1 bzw. WR2 als Leistungswandler und je einer Drehzahlmesseinheit DME1 bzw. DME2 als Messeinheiten, die je mit einem auf den Wellen W1 und W2 montierten Signalgeber bekannter Art verbunden sind. In den Drehzahlmesseinheiten DME1 und DME2 wird das im Signalgeber gemessene Signal zur Bestimmung der Winkelgeschwindigkeiten ω1 und ω2 verarbeitet, wobei diese anschliessend an die Kontrolleinheiten KE1 bzw. KE2 übertragen werden.The control units SE1 and SE2 are according to the invention symmetrically constructed and consist essentially of each a control unit KE1 or KE2, one inverter each WR1 or WR2 as a power converter and one each Speed measuring unit DME1 or DME2 as measuring units, the each with one mounted on shafts W1 and W2 Signalers known type are connected. In the Speed measuring units DME1 and DME2 will be in the signal transmitter measured signal to determine the angular velocities ω1 and ω2 processed, this subsequently to the Control units KE1 or KE2 are transmitted.

In der Kontrolleinheit KE1 bzw. KE2 werden Steuersignale SS1 bzw. SS2 zum Ansteuern des Wechselrichters WR1 bzw. WR2 generiert. Hierzu werden neben der Winkelgeschwindigkeit ω1 bzw. ω2 auch durch den Wechselrichter WR1 resp. WR2 erzeugte Ausgangssignale für die Antriebseinheiten AE1 resp. AE2 verwendet, womit allfällige Nichtlinearitäten oder Asymmetrien der Wechselrichter WR1 bzw. WR2 automatisch kompensiert werden.In the control unit KE1 or KE2 control signals SS1 or SS2 for driving the inverter WR1 or WR2 generated. For this purpose, besides the angular velocity ω1 or ω2 also by the inverter WR1 resp. WR2 generated output signals for the drive units AE1 respectively. AE2 uses, with which possible nonlinearities or asymmetries of inverters WR1 or WR2 be automatically compensated.

In einer bevorzugten Ausführungsform der Erfindung sind die Antriebseinheiten AE1 und AE2 vom Typ elektrische Asynchronmaschinen (Rolf Fischer, "Elektrisch Maschinen", 5. Auflage, Carl Hanser Verlag, 1983, Seiten 170 bis 260). Die durch den Wechselrichter WR1 bzw. WR2 erzeugten Ausgangssignale sind in der Figur mit U1 bzw. U2 für die elektrische Spannung, mit I1 bzw. I2 für den elektrischen Strom und mit F1 bzw. F2 für die Frequenz bezeichnet.In a preferred embodiment of the invention, the Drive units AE1 and AE2 of the type electrical Asynchronous machines (Rolf Fischer, "Electrical Machines", 5th edition, Carl Hanser Verlag, 1983, pages 170 to 260). The generated by the inverter WR1 and WR2 Output signals are in the figure with U1 and U2 for the electrical voltage, with I1 or I2 for the electrical Current and denoted by F1 or F2 for the frequency.

Wie bereits erwähnt werden die Ausgangssignale U1, I1, F1 bzw. U2, I2, F2 zur genauen Einstellung in die Kontrolleinheit KE1 bzw. KE2 zurückgeführt. Damit ist ein erster innerer Regelkreis zur Einstellung der Drehzahl der Wellen W1 bzw. W2 vorhanden. Fasst man nämlich die Antriebseinheiten AE1 und AE2 als elektrisch-mechanische Wandler auf, dann werden die Spannungsfrequenzen F1 und F2 auf die Winkelgeschwindigkeiten ω1 und ω2 sowie die Spannunge U1 und U2 und Ströme I1 und I2 auf entsprechende Antriebsmomente abgebildet (Vektorantriebe). Ein weiterer Regelkreis entsteht durch das Messen der Wellendrehzahl mittels den Drehzahlmesseinheiten DME1 bzw. DME2 und der Rückführung der gemessenen Signale in die jeweiligen Kontrolleinheiten KE1 bzw. KE2. Dieser zweite Regelkreis wird im Zusammenhang mit der vorliegenden Erfindung als äusserer Regelkreis bezeichnet.As already mentioned, the output signals U1, I1, F1 or U2, I2, F2 for exact adjustment in the Control unit KE1 or KE2 returned. This is one first inner loop for adjusting the speed of Waves W1 and W2 present. Do you understand the Drive units AE1 and AE2 as electrical-mechanical Transducer, then the voltage frequencies F1 and F2 on the angular velocities ω1 and ω2 and the Voltages U1 and U2 and currents I1 and I2 to corresponding Drive torques shown (vector drives). Another Control loop is created by measuring the shaft speed by means of the speed measuring units DME1 or DME2 and the Return of the measured signals to the respective ones Control units KE1 or KE2. This second control circuit is used in connection with the present invention as called external control loop.

Zwischen den beiden symmetrischen Steuereinheiten SE1 und SE2 ist erfindungsgemäss eine schnelle Datenleitung DL, vorzugsweise in Form eines Datenbusses, vorgesehen, über welche die Winkelgeschwindigkeiten ω1 und ω2 der Wellen W1 und W2 und die Position der Zahnräder Z1 und Z2 zueinander exakt abgestimmt bzw. eingestellt werden können. Die Datenleitung DL ist vorgesehen, dass Winkelgeschwindigkeitsunterschiede sicher innerhalb der Steuereinheiten SE1 und SE2 verarbeitet und dass trotz allfälliger Drehmomentpulse weder ein Abheben der Zahnflanken bewirkt wird, welche in Kontakt bleiben sollen, noch dass ein zu hohes Überschussdrehmoment über die Zahnflanken übertragen wird.Between the two symmetrical control units SE1 and SE2 according to the invention is a fast data line DL, preferably in the form of a data bus, provided via which the angular velocities ω1 and ω2 of the waves W1 and W2 and the position of the gears Z1 and Z2 to each other can be exactly tuned or adjusted. The Data line DL is provided that Angular velocity differences safely within the Control units SE1 and SE2 processed and that despite any torque pulses neither lifting the Tooth flanks is effected, which should remain in contact, nor that too much excess torque over the Tooth flanks is transmitted.

In einer weiteren Ausführungsform der Erfindung ist vorgesehen, dass an die als Datenbus ausgebildete Datenleitung DL eine Recheneinheit angeschlossen wird, über die beispielsweise eine Drehzahleinstellung vorgenommen werden kann, insbesondere im Zusammenhang mit anderen Verfahrenskomponenten, mit denen die Zahnradpumpe verbunden ist.In a further embodiment of the invention provided that the trained as a data bus Data line DL is connected to a computing unit, via for example, made a speed adjustment can be, especially in the context of others Process components with which the gear pump connected is.

Claims (16)

  1. Method for operating a gear pump for feeding incompressible medium, the gear pump consisting of two intermeshing gears (Z1 Z2) supported on respective shafts (W1, W2), driven by respective driving units (AE1, AE2), the driving units (AE1, AE2) operably connected by a data line (DL) being controlled by a respective control unit (SE1, SE2) in such a manner that phase and angular velocity of the intermeshing gears (Z1, Z2) are coordinated precisely to avoid, on the one hand, a lifting off of surfaces of the teeth of the intermeshing gears (Z1, Z2) and to avoid, on the other hand, excess torque forces on teeth of the meshing gears (Z1, Z2).
  2. Method according to claim 1, characterized in that a power converter (WR1, WR2) is provided for each driving unit (AE1, AE2), each power converter (WR1, WR2) being operably connected with a respective driving unit (AE1, AE2) and in that a control device (KE1, KE2) is provided in each control unit (SE1, SE2) for generating control signals (SS1, SS2) which act upon the corresponding power converters (WR1, WR2), the data line (DL) existing between the two control units (SE1, SE2) having an effect on the respective control device (KE1, KE2) of the control units (SE1, SE2).
  3. Method according to claim 2, characterized in that the power converter output signals, or signals proportional thereto, are returned into the corresponding control device (KE1, KE2).
  4. Method according to one of the preceding claims, characterized in that the driving units (AE1 AE2) are of the asynchronous machine type.
  5. Method according to claim 4, characterized in that the power converters (WR1, WR2) are of the inverse rectifier type for generating current (I1, I2), voltage (U1/ U2) and frequency (F1/ F2).
  6. Method according to one of the preceding claims, characterized in that a rotational velocity measuring unit (DME1, DME2) is provided for each shaft (W1, W2) for determining the respective rotational shaft velocity (ω1, ω2) and/or the respective position of the shafts (W1, W2) with respect to one another, the rotational velocity measuring units (DME1, DME2) each being operably connected to the corresponding control device (KE1, KE2).
  7. Method according to one of the preceding claims, characterized in that the power ratio between the two driving units (AE1, AE2) is adjusted between 0.05 and 1.
  8. Method according to one of the preceding claims, characterized in that a computer unit is connected to the data line (DL).
  9. Gear pump for carrying out the method according to one of the claims 1 to 8, the gear pump consisting of two intermeshing gears (Z1, Z2), which are each assigned to a shaft (W1, W2) and which are each driven by a driving unit (AE1, AE2), the driving units (AE1, AE2) being each controllable by a control unit (SET, SE2) in such a manner that the shafts (W1, W2) rotate at a definable rotational velocity (ω1, ω2), characterized in that the control units (SE1, SE2) are connectable over a data line (DL), in that for each driving unit (AE1, AE2) a power converter (WR1, WR2) is provided which is operably connected to the respective driving unit (AE1, AE2), and in that in each control unit (SE1, SE2) a control device (KE1, KE2) is provided to generate control signals (SS1, SS2) which act upon the corresponding power converters (WR1, WR2), the data line (DL) existing between the two control units (SET, SE2) being operably connected to the respective control device (KE1, KE2) of the control units (SE1, SE2).
  10. Gear pump according to claim 9, characterized in that the control units (SE1, SE2) are constructed symmetrically with respect to one another.
  11. Gear pump according to claim 9, characterized in that the power converter output signals, or signals proportional thereto, are fed to the corresponding control device (KE1, KE2) .
  12. Gear pump according to one of the preceding claims, characterized in that the driving units (AE1, AE2) are of the asynchronous machine type.
  13. Gear pump according to claim 12, characterized in that the power converters (WR1, WR2) are of the inverse rectifier type for generating current (I1, I2), voltage (U1, U2) and frequency (F1, F2).
  14. Gear pump according to one of the preceding claims, characterized in that a rotational velocity measuring unit (DME1, DME2) is provided for each shaft (W1, W2) for determining the respective rotational shaft velocity (ω1, ω2) and/or the respective position of the shafts (W1, W2) with respect to one another, the rotational velocity measuring units (DME1, DME2) each being operably connected to a corresponding control device (KE1, KE2).
  15. Gear pump according to one of the preceding claims, characterized in that the power ratio between the two driving units (AE1, AE2) is adjusted between 0.05 and 1.
  16. Gear pump according to one of the preceding claims, characterized in that a computer unit is connected to the data line (DL).
EP98115962A 1998-08-25 1998-08-25 Gear pump with multiple driven shafts Expired - Lifetime EP0886068B1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP98115962A EP0886068B1 (en) 1998-08-25 1998-08-25 Gear pump with multiple driven shafts
DE59809839T DE59809839D1 (en) 1998-08-25 1998-08-25 Gear pump with a multi-shaft drive
US09/382,830 US6312225B1 (en) 1998-08-25 1999-08-25 Gear pump having a multishaft drive and method of operating same
US09/963,558 US6447256B2 (en) 1998-08-25 2001-09-27 Gear pump having a multishaft drive and method of operating same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP98115962A EP0886068B1 (en) 1998-08-25 1998-08-25 Gear pump with multiple driven shafts

Publications (3)

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EP0886068A2 EP0886068A2 (en) 1998-12-23
EP0886068A3 EP0886068A3 (en) 1999-03-17
EP0886068B1 true EP0886068B1 (en) 2003-10-08

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EP98115962A Expired - Lifetime EP0886068B1 (en) 1998-08-25 1998-08-25 Gear pump with multiple driven shafts

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US (2) US6312225B1 (en)
EP (1) EP0886068B1 (en)
DE (1) DE59809839D1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2275683A1 (en) 2009-06-18 2011-01-19 Maag Pump Systems AG Method for controlling a gear pump and an application of the method
EP2275684A1 (en) 2009-06-18 2011-01-19 Maag Pump Systems AG Assembly with a gear pump

Families Citing this family (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1249608A1 (en) 2001-10-24 2002-10-16 Maag Pump Systems Textron AG Device, like an extrusion machine, comprising a direct driven gear pump
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Also Published As

Publication number Publication date
EP0886068A3 (en) 1999-03-17
DE59809839D1 (en) 2003-11-13
US6447256B2 (en) 2002-09-10
EP0886068A2 (en) 1998-12-23
US6312225B1 (en) 2001-11-06
US20020009368A1 (en) 2002-01-24

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